Previous versions of the 'go' command would reject a pseudo-version
passed to 'go get' if that pseudo-version had a mismatched major
version and lacked a "+incompatible" suffix. However, they would
erroneously accept a version *with* a "+incompatible" suffix even if
the repo contained a vN/go.mod file for the same major version, and
would generate a "+incompatible" pseudo-version or version if the user
requested a tag, branch, or commit hash.
This change uniformly rejects "vN.…" without "+incompatible", and also
avoids resolving to "vN.…+incompatible", when vN/go.mod exists.
To maintain compatibility with existing go.mod files, it still accepts
"vN.…+incompatible" if the version is requested explicitly as such
and the repo root lacks a go.mod file.
Fixes#51331
Updates #51324
Updates #36438
Change-Id: I2b16150c73fc2abe4d0a1cd34cb1600635db7139
Reviewed-on: https://go-review.googlesource.com/c/go/+/387675
Trust: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
(cherry picked from commit 5a9fc946b4)
Reviewed-on: https://go-review.googlesource.com/c/go/+/387923
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
There was an off-by-one error in the time histogram buckets calculation
that caused the linear sub-buckets distances to be off by 2x.
The fix was trivial, but in writing tests I realized there was a much
simpler way to express the calculation for the histogram buckets, and
took the opportunity to do that here. The new bucket calculation also
fixes the bug.
For #50732.
Fixes#50733.
Change-Id: Idae89986de1c415ee4e148f778e0e101ca003ade
Reviewed-on: https://go-review.googlesource.com/c/go/+/380094
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit 2e9dcb5086)
Reviewed-on: https://go-review.googlesource.com/c/go/+/384620
The existing value of 512 bytes as is specified by RFC 1035.
However, the WSL resolver reportedly sends larger packets without
setting the truncation bit, which breaks using the Go resolver.
For 1.18 and backports, just increase the accepted packet size.
This is what GNU glibc does (they use 65536 bytes).
For 1.19 we plan to use EDNS to set the accepted packet size.
That will give us more time to test whether that causes any problems.
No test because I'm not sure how to write one and it wouldn't really
be useful anyhow.
For #6464
For #21160
For #44135
For #51127
For #51153Fixes#51161
Change-Id: I0243f274a06e010ebb714e138a65386086aecf17
Reviewed-on: https://go-review.googlesource.com/c/go/+/386015
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit 6e82ff83cf)
Reviewed-on: https://go-review.googlesource.com/c/go/+/386034
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
The regexp code assumes it can recurse over the structure of
a regexp safely. Go's growable stacks make that reasonable
for all plausible regexps, but implausible ones can reach the
“infinite recursion?” stack limit.
This CL limits the depth of any parsed regexp to 1000.
That is, the depth of the parse tree is required to be ≤ 1000.
Regexps that require deeper parse trees will return ErrInternalError.
A future CL will change the error to ErrInvalidDepth,
but using ErrInternalError for now avoids introducing new API
in point releases when this is backported.
Fixes#51112.
Fixes#51117.
Change-Id: I97d2cd82195946eb43a4ea8561f5b95f91fb14c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/384616
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/384855
Since at least CL 121857, the conversion logic in
(*modfetch).codeRepo.Stat has had a short-circuit to use the version
requested by the caller if it successfully resolves and is already
canonical.
However, we should not use that version if it refers to a branch
instead of a tag, because branches (unlike tags) usually do not refer
to a single, stable release: a branch named "v1.0.0" may be for the
development of the v1.0.0 release, or for the development of patches
based on v1.0.0, but only one commit (perhaps at the end of that
branch — but possibly not even written yet!) can be that specific
version.
We already have some logic to prefer tags that are semver-equivalent
to the version requested by the caller. That more general case
suffices for exact equality too — so we can eliminate the
special-case, fixing the bug and (happily!) also somewhat simplifying
the code.
Updates #35671Fixes#50686
Fixes CVE-2022-23773
Change-Id: I2fd290190b8a99a580deec7e26d15659b58a50b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/378400
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit fa4d9b8e2b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/382839
For an extension operation like MOVWreg, if the operand is already
extended, we optimize the second extension out. Usually a LoadReg
of a proper type would come already extended, as a MOVW/MOVWU etc.
instruction does. But for a LoadReg to a floating point register,
the instruction does not do the extension. So we cannot elide the
extension.
Updates #50671.
Fixes#50682.
Change-Id: Id8991df78d5acdecd3fd6138c558428cbd5f6ba3
Reviewed-on: https://go-review.googlesource.com/c/go/+/379236
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
(cherry picked from commit d93ff73ae2)
Reviewed-on: https://go-review.googlesource.com/c/go/+/379515
In iOS <14, the address space is strictly limited to 8 GiB, or 33 bits.
As a result, the page allocator also assumes all heap memory lives in
this region. This is especially necessary because the page allocator has
a PROT_NONE mapping proportional to the size of the usable address
space, so this keeps that mapping very small.
However starting with iOS 14, this restriction is relaxed, and mmap may
start returning addresses outside of the <14 range. Today this means
that in iOS 14 and later, users experience an error in the page
allocator when a heap arena is mapped outside of the old range.
This change increases the ios/arm64 heapAddrBits to 40 while
simultaneously making ios/arm64 use the 64-bit pagealloc implementation
(with reservations and incremental mapping) to accommodate both iOS
versions <14 and 14+.
Once iOS <14 is deprecated, we can remove these exceptions and treat
ios/arm64 like any other arm64 platform.
This change also makes the BaseChunkIdx expression a little bit easier
to read, while we're here.
For #46860.
Fixes#48115.
Change-Id: I13865f799777739109585f14f1cc49d6d57e096b
Reviewed-on: https://go-review.googlesource.com/c/go/+/344401
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
(cherry picked from commit af368da0b137116faba81ca249a8d964297e6e45)
Reviewed-on: https://go-review.googlesource.com/c/go/+/369736
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
On macOS 12 a new malloc implementation (nano) is used by default,
and apparently it reserves address range
0x600000000000-0x600020000000, which conflicts with the address
range that TSAN uses for Go. Work around the issue by changing the
address range slightly.
The actual change is made on LLVM at https://reviews.llvm.org/D114825 .
This CL includes syso's built with the patch applied.
The syso in 1.16 was identical to the syso before the equivalent fix
on the main branch, so the back-ported syso is identical to the fixed
syso on the main branch.
Fixes#50072.
Updates #49138.
Change-Id: I7b367d6e042b0db39a691c71601c98e4f8728a70
Reviewed-on: https://go-review.googlesource.com/c/go/+/367916
Trust: Cherry Mui <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
(cherry picked from commit 5f6552018d)
Reviewed-on: https://go-review.googlesource.com/c/go/+/370698
Pull in approved backports to golang.org/x/net/http2:
64539c1 http2: don't count aborted streams as active in tests
e677a40 ipv6: OpenBSD does not appear to support multicast loopback
d8ae719 net/http2: Fix handling of expect continue
cc2f99c http2: avoid busy loop when ResponseHeaderTimeout is set
5533dda http2: avoid spurious RoundTrip error when server closes and resets stream
26ec667 http2: close conns after use when req.Close is set
By doing:
$ go get -d golang.org/x/net@internal-branch.go1.16-vendor
go: downloading golang.org/x/net v0.0.0-20211201233224-64539c132272
go get: upgraded golang.org/x/net v0.0.0-20211101194150-d8c3cde3c676 => v0.0.0-20211201233224-64539c132272
$ go mod tidy
$ go mod vendor
$ go generate -run=bundle std
Fixes#49904.
Fixes#49623.
Fixes#49661.
Fixes#49560.
Fixes#49908.
Fixes#49910.
Change-Id: I73261b189f84cf1919a79129ec36a1c187723133
Reviewed-on: https://go-review.googlesource.com/c/go/+/368594
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
When sending a Request with a non-context deadline, we create a
context with a timeout. This context is canceled when closing the
response body, and also if a read from the response body returns
an error (including io.EOF).
Cancelling the context in Response.Body.Read interferes with the
HTTP/2 client cleaning up after a request is completed, and is
unnecessary: The user should always close the body, the impact
from not canceling the context is minor (the context timer leaks
until it fires).
For #49366.
Fixes#49558.
Change-Id: Ieaed866116916261d9079f71d8fea7a7b303b8fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/361919
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 76fbd61673)
Reviewed-on: https://go-review.googlesource.com/c/go/+/368084
Reviewed-by: Michael Knyszek <mknyszek@google.com>
When syscall's DLL.FindProc calls into syscall_getprocaddress with a
byte slice pointer, we need to keep those bytes alive. Otherwise the GC
will collect the allocation, and we wind up calling `GetProcAddress` on
garbage, which showed up as various flakes in the builders. It turns out
that this problem extends to many uses of //go:cgo_unsafe_args
throughout, on all platforms. So this patch fixes the issue by keeping
non-integer pointer arguments alive through their invocation in
//go:cgo_unsafe_args functions.
Fixes#49867.
Updates #49731.
Change-Id: I93e4fbc2e8e210cb3fc53149708758bb33f2f9c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/368356
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Previously, opening a zip with (*Reader).Open could result in a panic if
the zip contained a file whose name was exclusively made up of slash
characters or ".." path elements.
Open could also panic if passed the empty string directly as an argument.
Now, any files in the zip whose name could not be made valid for
fs.FS.Open will be skipped, and no longer added to the fs.FS file list,
although they are still accessible through (*Reader).File.
Note that it was already the case that a file could be accessible from
(*Reader).Open with a name different from the one in (*Reader).File, as
the former is the cleaned name, while the latter is the original one.
Finally, made the actual panic site robust as a defense-in-depth measure.
Fixes CVE-2021-41772
Fixes#48251
Updates #48085
Co-authored-by: Filippo Valsorda <filippo@golang.org>
Change-Id: I6271a3f2892e7746f52e213b8eba9a1bba974678
Reviewed-on: https://go-review.googlesource.com/c/go/+/349770
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Julie Qiu <julie@golang.org>
(cherry picked from commit b24687394b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/360858
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Pull in approved backports to golang.org/x/net/http2:
d8c3cde set ContentLength to -1 for HEAD response with no Content-Length
7b24c0a set Response.ContentLength to 0 when headers end stream
c4031f5 don't abort half-closed streams on server connection close
2f744fa on write errors, close ClientConn before returning from RoundTrip
275be3f deflake TestTransportReqBodyAfterResponse_200
d26011a close the Request's Body when aborting a stream
e5dd05d return unexpected eof on empty response with non-zero content length
640e170 don't rely on system TCP buffer sizes in TestServer_MaxQueuedControlFrames
198b78c detect write-blocked PING frames
20ed279 avoid race in TestTransportReqBodyAfterResponse_403.
d585ef0 avoid clientConnPool panic when NewClientConn fails
d06dfc7 avoid extra GetConn trace call
1760f31 refactor request write flow
6e87631 remove PingTimeout from TestTransportPingWhenReading
b843c7d fix Transport connection pool TOCTOU max concurrent stream bug
ab1d67c shut down idle Transport connections after protocol errors
3741e47 remove check for read-after-close of request bodies
2df4c53 fix race in DATA frame padding refund
d7eefc9 avoid blocking while holding ClientConn.mu
78e8d65 fix off-by-one error in client check for max concurrent streams
828651b close request body after early RoundTrip failures
59c0c25 limit client initial MAX_CONCURRENT_STREAMS
524fcad make Transport not reuse conns after a stream protocol error
0fe5f8a accept zero-length block fragments in HEADERS frames
0e5043f close the request body if needed
bb4ce86 reduce frameScratchBuffer caching aggressiveness
3112343 also set "http/1.1" ALPN in ConfigureServer
63939f4 switch to ASCII equivalents of string functions
54161af use (*tls.Dialer).DialContext in dialTLS
75b906f discard DATA frames with higher stream IDs during graceful shutdown
1dfe517 rework Ping test to rely less on timing
By doing:
$ go get -d golang.org/x/net@internal-branch.go1.16-vendor
go get: upgraded golang.org/x/net v0.0.0-20210901185431-d2e9a4ea682f => v0.0.0-20211101194150-d8c3cde3c676
$ go mod tidy
$ go mod vendor
$ go generate -run=bundle std
Fixes#49076.
Fixes#48822.
Fixes#48649.
Change-Id: Ie17f327eef2b6e6a9a1ac7635c5c4daef792e893
Reviewed-on: https://go-review.googlesource.com/c/go/+/359774
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Both netpollblock and netpollunblock read gpp using a non-atomic load.
When consuming a ready event, netpollblock clears gpp using a non-atomic
store, thus skipping a barrier.
Thus on systems with weak memory ordering, a sequence like so this is
possible:
T1 T2
1. netpollblock: read gpp -> pdReady
2. netpollblock: store gpp -> 0
3. netpollunblock: read gpp -> pdReady
4. netpollunblock: return
i.e., without a happens-before edge between (2) and (3), netpollunblock
may read the stale value of gpp.
Switch these access to use atomic loads and stores in order to create
these edges.
For ease of future maintainance, I've simply changed rg and wg to always
be accessed atomically, though I don't believe pollOpen or pollClose
require atomics today.
For #48925Fixes#49009
Change-Id: I903ea667eea320277610b4f969129935731520c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/355952
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: David Chase <drchase@google.com>
(cherry picked from commit 1b072b3ed5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/356370
Ensure constant shift amounts are in the range [0-31]. When shift amounts
are out of range, bad things happen. Shift amounts out of range occur
when lowering 64-bit shifts (we take an in-range shift s in [0-63] and
calculate s-32 and 32-s, both of which might be out of [0-31]).
The constant shift operations themselves still work, but their shift
amounts get copied unmolested to operations like ORshiftLL which use only
the low 5 bits. That changes an operation like <<100 which unconditionally
produces 0, to <<4, which doesn't.
Fixes#48478
Change-Id: I87363ef2b4ceaf3b2e316426064626efdfbb8ee3
Reviewed-on: https://go-review.googlesource.com/c/go/+/350969
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit eff27e858b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/351070
Reviewed-by: Austin Clements <austin@google.com>
On Wasm, wasm_exec.js puts command line arguments at the beginning
of the linear memory (following the "zero page"). Currently there
is no limit for this, and a very long command line can overwrite
the program's data section. Prevent this by limiting the command
line to 4096 bytes, and in the linker ensuring the data section
starts at a high enough address (8192).
(Arguably our address assignment on Wasm is a bit confusing. This
is the minimum fix I can come up with.)
Thanks to Ben Lubar for reporting this issue.
Change by Cherry Mui <cherryyz@google.com>.
For #48797Fixes#48799
Fixes CVE-2021-38297
Change-Id: I0f50fbb2a5b6d0d047e3c134a88988d9133e4ab3
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1205933
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/354591
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
When the adjustTimers function removed a timer it assumed it was
sufficient to continue the heap traversal at that position.
However, in some cases a timer will be moved to an earlier
position in the heap. If that timer is timerModifiedEarlier,
that can leave timerModifiedEarliest not correctly representing
the earlier such timer.
Fix the problem by restarting the heap traversal at the earliest
changed position.
For #47762Fixes#47858
Change-Id: I152bbe62793ee40a680baf49967bcb89b1f94764
Reviewed-on: https://go-review.googlesource.com/c/go/+/343882
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit 2da3375e9b)
Reviewed-on: https://go-review.googlesource.com/c/go/+/350000
If the indicated directory size in the archive header is so large that
subtracting it from the archive size overflows a uint64, the check that
the indicated number of files in the archive can be effectively
bypassed. Prevent this from happening by checking that the indicated
directory size is less than the size of the archive.
Thanks to the OSS-Fuzz project for discovering this issue and to
Emmanuel Odeke for reporting it.
Fixes#47985
Updates #47801
Fixes CVE-2021-39293
Change-Id: Ifade26b98a40f3b37398ca86bd5252d12394dd24
Reviewed-on: https://go-review.googlesource.com/c/go/+/343434
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
(cherry picked from commit bacbc33439)
Reviewed-on: https://go-review.googlesource.com/c/go/+/345409
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Cherry Mui <cherryyz@google.com>
This patch reinstates a fix for PowerPC with regard to making VDSO calls
while receiving a signal, and subsequently crashing. The crash happens
because certain VDSO calls can modify the r30 register, which is where g
is stored. This change was reverted for PowerPC because r30 is supposed
to be a non-volatile register. This is true, but that only makes a
guarantee across function calls, but not "within" a function call. This
patch was seemingly fine before because the Linux kernel still had hand
rolled assembly VDSO function calls, however with a recent change to C
function calls it seems the compiler used can generate instructions
which temporarily clobber r30. This means that when we receive a signal
during one of these calls the value of r30 will not be the g as the
runtime expects, causing a segfault.
You can see from this assembly dump how the register is clobbered during
the call:
(the following is from a 5.13rc2 kernel)
```
Dump of assembler code for function __cvdso_clock_gettime_data:
0x00007ffff7ff0700 <+0>: cmplwi r4,15
0x00007ffff7ff0704 <+4>: bgt 0x7ffff7ff07f0 <__cvdso_clock_gettime_data+240>
0x00007ffff7ff0708 <+8>: li r9,1
0x00007ffff7ff070c <+12>: slw r9,r9,r4
0x00007ffff7ff0710 <+16>: andi. r10,r9,2179
0x00007ffff7ff0714 <+20>: beq 0x7ffff7ff0810 <__cvdso_clock_gettime_data+272>
0x00007ffff7ff0718 <+24>: rldicr r10,r4,4,59
0x00007ffff7ff071c <+28>: lis r9,32767
0x00007ffff7ff0720 <+32>: std r30,-16(r1)
0x00007ffff7ff0724 <+36>: std r31,-8(r1)
0x00007ffff7ff0728 <+40>: add r6,r3,r10
0x00007ffff7ff072c <+44>: ori r4,r9,65535
0x00007ffff7ff0730 <+48>: lwz r8,0(r3)
0x00007ffff7ff0734 <+52>: andi. r9,r8,1
0x00007ffff7ff0738 <+56>: bne 0x7ffff7ff07d0 <__cvdso_clock_gettime_data+208>
0x00007ffff7ff073c <+60>: lwsync
0x00007ffff7ff0740 <+64>: mftb r30 <---- RIGHT HERE
=> 0x00007ffff7ff0744 <+68>: ld r12,40(r6)
```
What I believe is happening is that the kernel changed the PowerPC VDSO
calls to use standard C calls instead of using hand rolled assembly. The
hand rolled assembly calls never touched r30, so this change was safe to
roll back. That does not seem to be the case anymore as on the 5.13rc2
kernel the compiler *is* generating assembly which modifies r30, making
this change again unsafe and causing a crash when the program receives a
signal during these calls (which will happen often due to async
preempt). This change happened here:
https://lwn.net/ml/linux-kernel/235e5571959cfa89ced081d7e838ed5ff38447d2.1601365870.git.christophe.leroy@csgroup.eu/.
I realize this was reverted due to unexplained hangs in PowerPC
builders, but I think we should reinstate this change and investigate
those issues separately:
f4ca3c1e0aFixes#46858
Change-Id: Ib18d7bbfc80a1a9cb558f0098878d41081324b52
GitHub-Last-Rev: c3002bcfca
GitHub-Pull-Request: golang/go#46767
Reviewed-on: https://go-review.googlesource.com/c/go/+/328110
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
(cherry picked from commit 16e82be454)
Reviewed-on: https://go-review.googlesource.com/c/go/+/334410
Run-TryBot: Cherry Mui <cherryyz@google.com>
In CL 326211 a change was made to switch "go.map.zero" symbols from
non-pkg DUPOK symbols to hashed symbols. The intent of this change was
ensure that in cases where there are multiple competing go.map.zero
symbols feeding into a link, the largest map.zero symbol is selected.
The change was buggy, however, and resulted in duplicate symbols in
the final binary (see bug cited below for details). This duplication
was relatively benign for linux/ELF, but causes duplicate definition
errors on Windows.
This patch switches "go.map.zero" symbols back from hashed symbols to
non-pkg DUPOK symbols, and updates the relevant code in the loader to
ensure that we do the right thing when there are multiple competing
DUPOK symbols with different sizes.
Fixes#47289.
Change-Id: I8aeb910c65827f5380144d07646006ba553c9251
Reviewed-on: https://go-review.googlesource.com/c/go/+/334930
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit 49402bee36)
Reviewed-on: https://go-review.googlesource.com/c/go/+/335629
In CL 336432 we changed adjusttimers so that it no longer cleared
timerModifiedEarliest if there were no timersModifiedEarlier timers.
This caused some Google internal tests to time out, presumably due
to the increased contention on timersLock. We can avoid that by
simply not skipping the loop in adjusttimers, which lets us safely
clear timerModifiedEarliest. And if we don't skip the loop, then there
isn't much reason to keep the count of timerModifiedEarlier timers at all.
So remove it.
The effect will be that for programs that create some timerModifiedEarlier
timers and then remove them all, the program will do an occasional
additional loop over all the timers. And, programs that have some
timerModifiedEarlier timers will always loop over all the timers,
without the quicker exit when they have all been seen. But the loops
should not occur all that often, due to timerModifiedEarliest.
For #47329
For #47332
Change-Id: I7b244c1244d97b169a3c7fbc8f8a8b115731ddee
Reviewed-on: https://go-review.googlesource.com/c/go/+/337309
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
(cherry picked from commit bfbb288574)
Reviewed-on: https://go-review.googlesource.com/c/go/+/338649
CL 249238 changes ResponseWriter.ReadFrom to probe the source with
a single read of sniffLen bytes before writing the response header.
If the source returns less than sniffLen bytes without reaching
EOF, this can cause Content-Type and Content-Length detection to
fail.
Fix ResponseWrite.ReadFrom to copy a full sniffLen bytes from
the source as a probe.
Drop the explicit call to w.WriteHeader; writing the probe will
trigger a WriteHeader call.
Consistently use io.CopyBuffer; ReadFrom has already acquired a
copy buffer, so it may as well use it.
Fixes#44984.
Updates #44953.
Change-Id: Ic49305fb827a2bd7da4764b68d64b797b5157dc0
Reviewed-on: https://go-review.googlesource.com/c/go/+/301449
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 831f9376d8)
Reviewed-on: https://go-review.googlesource.com/c/go/+/324971
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
The compiler machinery that generates "map.zero" symbols marks them as
RODATA and DUPOK, which is problematic when a given application has
multiple map zero symbols (from different packages) with varying
sizes: the dupok path in the loader assumes that if two symbols have
the same name, it is safe to pick any of the versions. In the case of
map.zero, the link needs to select the largest symbol, not an
arbitrary sym.
To fix this problem, mark map.zero symbols as content-addressable,
since the loader's content addressability processing path already
supports selection of the larger symbol in cases where there are dups.
Fixes#46657.
Change-Id: Iabd2feef01d448670ba795c7eaddc48c191ea276
Reviewed-on: https://go-review.googlesource.com/c/go/+/326211
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit aa5540cd82)
Reviewed-on: https://go-review.googlesource.com/c/go/+/326212
Run-TryBot: Cherry Mui <cherryyz@google.com>
This backports the test from CL 319669, but — because of extensive
changes to the module loader during the Go 1.17 cycle — the
implementation is entirely different. (This implementation is based on
the addGoStmt function present in init.go in the 1.16 branch.)
Fixes#46144
Updates #46142
Change-Id: Ib7a0a159e53cbe476be6aa9a050add10cc750dec
Reviewed-on: https://go-review.googlesource.com/c/go/+/319671
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
For some reason, the go.mod file added to this test in CL 147281 lists
'go 1.20' instead of the version that was actually current when the
go.mod file was added.
That causes the test's behavior to change under lazy loading, because
1.20 is above the threshold to trigger lazy-loading invariants (1.17).
This backports CL 314049 to Go 1.16 in order to fix a spurious test
failure in a subsequent change.
For #46144
Updates #46142
Updates #36460
Change-Id: I92400996cb051ab30e99bfffafd91ff32a1e7087
Reviewed-on: https://go-review.googlesource.com/c/go/+/314049
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/319670
Reviewed-by: Jay Conrod <jayconrod@google.com>
'go mod download' without arguments is frequently used to populate the
module cache. It tends to fetch a lot of extra files (for modules in
the build list that aren't needed to build packages in the main
module). It's annoying when sums are written for these extra files.
'go mod download mod@version' will still write sums for specific
modules in the build list. 'go mod download all' still has the
previous behavior.
For now, all invocations of 'go mod download' still update go.mod and
go.sum with changes needed to load the build list (1.15 behavior).
Fixes#46214
Change-Id: I9e17d18a7466ac7271a0e1a2b663f6b3cb168c97
Reviewed-on: https://go-review.googlesource.com/c/go/+/318629
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
(cherry picked from commit 4fb10b2118)
Reviewed-on: https://go-review.googlesource.com/c/go/+/321892
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
When creating programs with large text sections on ppc64le,
trampolines are needed for calls that are too far; however
they are not created if the code is generated such that the TOC
register r2 is initialized and maintained in the code because
then the external linker can create the trampolines. Previously
the function DynlinkingGo was used to determine this but in the
case where plugins are used, this could return true even though
r2 is not valid.
To fix this problem I've added a new function r2Valid which returns
true when the build options indicate that the r2 is
initialized and maintained. Because of the ways that
DynlinkingGo is used I wanted to maintain its previous
behavior.
Fixes#45927
Change-Id: I6d902eba6ad41757aa6474948b79acdbd479cb38
Reviewed-on: https://go-review.googlesource.com/c/go/+/315289
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
(cherry picked from commit 9ed736ac2a)
Reviewed-on: https://go-review.googlesource.com/c/go/+/316750
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
The runtime support for syscall.AllThreadsSyscall() functions had
some corner case deadlock issues when signal handling was in use.
This was observed in at least 3 build test failures on ppc64 and
amd64 architecture CGO_ENABLED=0 builds over the last few months.
The fixes involve more controlled handling of signals while the
AllThreads mechanism is being executed. Further details are
discussed in bug #44193.
The all-threads syscall support is new in go1.16, so earlier
releases are not affected by this bug.
Fixes#45307
Change-Id: I01ba8508a6e1bb2d872751f50da86dd07911a41d
Reviewed-on: https://go-review.googlesource.com/c/go/+/305149
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Pratt <mpratt@google.com>
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
(cherry picked from commit 7e97e4e8cc)
Reviewed-on: https://go-review.googlesource.com/c/go/+/316869
Run-TryBot: Ian Lance Taylor <iant@golang.org>
If the current time is computed from extend string
and the zone file contains multiple zones with the
same name, the lookup by name might find incorrect
zone.
This happens for example with the slim Europe/Dublin
time zone file in the embedded zip. This zone file
has last transition in 1996 and rest is covered by
extend string.
tzset returns IST as the zone name to use, but there
are two records with IST name. Lookup by name finds
the wrong one. We need to check offset and isDST too.
In case we can't find an existing zone, we allocate
a new zone so that we use correct offset and isDST.
I have renamed zone variable to zones as it shadowed
the zone type that we need to allocate the cached zone.
Backport note: this change also incorporates portions of
CL 264077.
For #45370Fixes#45385
Change-Id: If7a0cccc1908e27f0509bf422d824133133250fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/307211
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Under certain circumstances, the existing rules for bit operations can
produce code that writes beyond its intended bounds. For example,
consider the following code:
func repro(b []byte, addr, bit int32) {
_ = b[3]
v := uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 | 1<<(bit&31)
b[0] = byte(v)
b[1] = byte(v >> 8)
b[2] = byte(v >> 16)
b[3] = byte(v >> 24)
}
Roughly speaking:
1. The expression `1 << (bit & 31)` is rewritten into `(SHLL 1 bit)`
2. The expression `uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 |
uint32(b[3])<<24` is rewritten into `(MOVLload &b[0])`
3. The statements `b[0] = byte(v) ... b[3] = byte(v >> 24)` are
rewritten into `(MOVLstore &b[0], v)`
4. `(ORL (SHLL 1, bit) (MOVLload &b[0]))` is rewritten into
`(BTSL (MOVLload &b[0]) bit)`. This is a valid transformation because
the destination is a register: in this case, the bit offset is masked
by the number of bits in the destination register. This is identical
to the masking performed by `SHL`.
5. `(MOVLstore &b[0] (BTSL (MOVLload &b[0]) bit))` is rewritten into
`(BTSLmodify &b[0] bit)`. This is an invalid transformation because
the destination is memory: in this case, the bit offset is not
masked, and the chosen instruction may write outside its intended
32-bit location.
These changes fix the invalid rewrite performed in step (5) by
explicitly maksing the bit offset operand to `BT(S|R|C)(L|Q)modify`. In
the example above, the adjusted rules produce
`(BTSLmodify &b[0] (ANDLconst [31] bit))` in step (5).
These changes also add several new rules to rewrite bit sets, toggles,
and clears that are rooted at `(OR|XOR|AND)(L|Q)modify` operators into
appropriate `BT(S|R|C)(L|Q)modify` operators. These rules catch cases
where `MOV(L|Q)store ((OR|XOR|AND)(L|Q) ...)` is rewritten to
`(OR|XOR|AND)(L|Q)modify` before the `(OR|XOR|AND)(L|Q) ...` can be
rewritten to `BT(S|R|C)(L|Q) ...`.
Overall, compilecmp reports small improvements in code size on
darwin/amd64 when the changes to the compiler itself are exlcuded:
file before after Δ %
runtime.s 536464 536412 -52 -0.010%
bytes.s 32629 32593 -36 -0.110%
strings.s 44565 44529 -36 -0.081%
os/signal.s 7967 7959 -8 -0.100%
cmd/vendor/golang.org/x/sys/unix.s 81686 81678 -8 -0.010%
math/big.s 188235 188253 +18 +0.010%
cmd/link/internal/loader.s 89295 89056 -239 -0.268%
cmd/link/internal/ld.s 633551 633232 -319 -0.050%
cmd/link/internal/arm.s 18934 18928 -6 -0.032%
cmd/link/internal/arm64.s 31814 31801 -13 -0.041%
cmd/link/internal/riscv64.s 7347 7345 -2 -0.027%
cmd/compile/internal/ssa.s 4029173 4033066 +3893 +0.097%
total 21298280 21301472 +3192 +0.015%
Fixes#45253
Change-Id: I2e560548b515865129e1724e150e30540e9d29ce
GitHub-Last-Rev: ab94ede1d097f920a9d1d3da403c8e4a3d8f6d44
GitHub-Pull-Request: golang/go#45242
Reviewed-on: https://go-review.googlesource.com/c/go/+/305069
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When using cgo, some of the frames can be provided by cgoTraceback, a
cgo-provided function to generate C tracebacks. Unlike Go tracebacks,
cgoTraceback has no particular guarantees that it produces valid
tracebacks.
If one of the (invalid) frames happens to put the PC in the alignment
region at the end of a function (filled with int 3's on amd64), then
Frames.Next will find a valid funcInfo for the PC, but pcdatavalue will
panic because PCDATA doesn't cover this PC.
Tolerate this case by doing a non-strict PCDATA lookup. We'll still show
a bogus frame, but at least avoid throwing.
For #44971Fixes#45303
Change-Id: I9eed728470d6f264179a7615bd19845c941db78c
Reviewed-on: https://go-review.googlesource.com/c/go/+/301369
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
(cherry picked from commit e4a4161f1f)
Reviewed-on: https://go-review.googlesource.com/c/go/+/305889
We need to be careful that when doing value graph surgery, we not
re-substitute a value that has already been substituted. That can lead
to confusing a previous iteration's value with the current iteration's
value.
The simple fix in this CL just aborts the optimization if it detects
intertwined phis (a phi which is the argument to another phi). It
might be possible to keep the optimization with a more complicated
CL, but:
1) This CL is clearly safe to backport.
2) There were no instances of this abort triggering in
all.bash, prior to the test introduced in this CL.
Fixes#45192
Change-Id: I2411dca03948653c053291f6829a76bec0c32330
Reviewed-on: https://go-review.googlesource.com/c/go/+/304251
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
(cherry picked from commit 771c57e68e)
Reviewed-on: https://go-review.googlesource.com/c/go/+/304530
We used to clear GOPATH in all the build scripts.
Clearing GOPATH is misleading at best, since you just end up
with the default GOPATH (%USERPROFILE%\go on Windows).
Unless that's your GOROOT, in which case you end up with a
fatal error from the go command (#43938).
run.bash changed to setting GOPATH=/dev/null, which has no
clear analogue on Windows.
run.rc still clears GOPATH.
Change them all to set GOPATH to a non-existent directory
/nonexist-gopath or c:\nonexist-gopath.
For #45238.
Fixes#45240.
Change-Id: I51edd66d37ff6a891b0d0541d91ecba97fbbb03d
Reviewed-on: https://go-review.googlesource.com/c/go/+/288818
Trust: Russ Cox <rsc@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
(cherry picked from commit bb6efb9609)
Reviewed-on: https://go-review.googlesource.com/c/go/+/304772
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Trust: Carlos Amedee <carlos@golang.org>
Currently, in the trampoline generation pass we expect packages
are laid out in dependency order, so a cross-package jump always
has a known target address so we can check if a trampoline is
needed. With linknames, there can be cycles in the package
dependency graph, making this algorithm no longer work. For them,
as the target address is unkown we conservatively generate a
trampoline. This may generate unnecessary trampolines (if the
packages turn out laid together), but package cycles are extremely
rare so this is fine.
Updates #44639.
Fixes#44640.
Change-Id: I2dc2998edacbda27d726fc79452313a21d07787a
Reviewed-on: https://go-review.googlesource.com/c/go/+/292490
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
(cherry picked from commit 098504c73f)
Reviewed-on: https://go-review.googlesource.com/c/go/+/296909
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Static tmps are private to a package, but with plugins a package
can be shared among multiple DSOs. They need to have a consistent
view of the static tmps, especially for writable ones. So export
them. (Read-only static tmps have the same values anyway, so it
doesn't matter. Also Mach-O doesn't support dynamically exporting
read-only symbols anyway.)
Updates #44956.
Fixes#45030.
Change-Id: I921e25b7ab73cd5d5347800eccdb7931e3448779
Reviewed-on: https://go-review.googlesource.com/c/go/+/301793
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
(cherry picked from commit de012bc095359e1b552d4ea6fb6b2995f3ab04f5)
Reviewed-on: https://go-review.googlesource.com/c/go/+/302449
Previously, if an extracted module directory existed in the module
cache, but the corresponding ziphash file did not, if the sum was
missing from go.sum, we would not verify the sum. This caused 'go get'
not to write missing sums. 'go build' in readonly mode (now the
default) checks for missing sums and doesn't attempt to fetch modules
that can't be verified against go.sum.
With this change, when requesting the module directory with
modfetch.DownloadDir, if the ziphash file is missing, the go command
will re-hash the zip without downloading or re-extracting it again.
Note that the go command creates the ziphash file before the module
directory, but another program could remove it separately, and it
might not be present after a crash.
Fixes#44812
Change-Id: I64551e048a3ba17d069de1ec123d5b8b2757543c
Reviewed-on: https://go-review.googlesource.com/c/go/+/298352
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
(cherry picked from commit 302a400316)
Reviewed-on: https://go-review.googlesource.com/c/go/+/298851
The timerpMask optimization updates a mask of Ps (potentially)
containing timers in pidleget / pidleput. For correctness, it depends on
the assumption that new timers can only be added to a P's own heap.
addtimer violates this assumption if it is preempted after computing pp.
That G may then run on a different P, but adding a timer to the original
P's heap.
Avoid this by disabling preemption while pp is in use.
Other uses of doaddtimer should be OK:
* moveTimers: always moves to the current P's heap
* modtimer, cleantimers, addAdjustedTimers, runtimer: does not add net
new timers to the heap while locked
For #44868Fixes#44869
Change-Id: I4a5d080865e854931d0a3a09a51ca36879101d72
Reviewed-on: https://go-review.googlesource.com/c/go/+/300610
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
(cherry picked from commit aa26687e45)
Reviewed-on: https://go-review.googlesource.com/c/go/+/300611
'go mod tidy' and 'go mod vendor' normally report errors when a
package can't be imported, even if the import appears in a file that
wouldn't be compiled by the current version of Go. These errors are
common for packages introduced in higher versions of Go, like "embed"
in 1.16.
This change causes 'go mod tidy' and 'go mod vendor' to ignore
missing package errors if the import path appears to come from the
standard library because it lacks a dot in the first path element.
Fixes#44793
Updates #27063
Change-Id: I61d6443e77ab95fd8c0d1514f57ef4c8885a77cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/298749
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
(cherry picked from commit 56d52e6611)
Reviewed-on: https://go-review.googlesource.com/c/go/+/298949
One of escape analysis's responsibilities is to summarize whether/how
each function parameter flows to the heap so we can correctly
incorporate those flows into callers' escape analysis data flow
graphs.
As an optimization, we separately record when parameters flow to
result parameters, so that we can more precisely analyze parameter
flows based on how the results are used at the call site. However, if
a named result parameter itself needs to be heap allocated, this
optimization isn't safe and the parameter needs to be recorded as
flowing to heap rather than flowing to result.
Escape analysis used to get this correct because it conservatively
rewalked the data-flow graph multiple times. So even though it would
incorrectly record the result parameter flow, it would separately find
a flow to the heap. However, CL 196811 (specifically, case 3)
optimized the walking logic to reduce unnecessary rewalks causing us
to stop finding the extra heap flow.
This CL fixes the issue by correcting location.leakTo to be sensitive
to sink.escapes and not record result-flows when the result parameter
escapes to the heap.
Fixes#44659.
Change-Id: I48742ed35a6cab591094e2d23a439e205bd65c50
Reviewed-on: https://go-review.googlesource.com/c/go/+/297289
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/297290
The third argument to GetQueuedCompletionStatus is a pointer to a
uintptr, not a uint32. Users of this functions have therefore been
corrupting their memory every time they used it. Either that memory
corruption was silent (dangerous), or their programs didn't work so they
chose a different API to use.
This fixes the problem by passing through an intermediate buffer.
Updates #44538.
Fixes#44593.
Change-Id: Icacd71f705b36e41e52bd8c4d74898559a27522f
Reviewed-on: https://go-review.googlesource.com/c/go/+/296150
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
In CL 253457, we did the same fix for direct function calls. But for
method calls, the receiver argument also need to be passed through the
wrapper function, which we are not doing so the compiler crashes with
the code in #44415.
It will be nicer if we can rewrite OCALLMETHOD to normal OCALLFUNC, but
that will be for future CL. The passing receiver argument to wrapper
function is easier for backporting to go1.16 branch.
Fixes#44464
Change-Id: I03607a64429042c6066ce673931db9769deb3124
Reviewed-on: https://go-review.googlesource.com/c/go/+/296490
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/296769
Trust: Bryan C. Mills <bcmills@google.com>
DWARF generation uses variable source positions (file/line/col) as a
way to uniquely identify locals and parameters, as part of the process
of matching up post-optimization variables with the corresponding
pre-optimization versions (since the DWARF needs to be in terms of the
original source constructs).
This strategy can run into problems when compiling obfuscated or
machine-generated code, where you can in some circumstances wind up
with two local variables that appear to have the same name, file,
line, and column. This patch changes DWARF generation to skip over
such duplicates as opposed to issuing a fatal error (if an
obfuscation tool is in use, it is unlikely that a human being will be
able to make much sense of DWARF info in any case).
Fixes#44433.
Change-Id: I198022d184701aa9ec3dce42c005d29b72d2e321
Reviewed-on: https://go-review.googlesource.com/c/go/+/294289
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
(cherry picked from commit e78e04ce39)
Reviewed-on: https://go-review.googlesource.com/c/go/+/294789
The code for delayed declaration of inlined result parameters only
handles non-empty return statements. This is generally okay, because
we already early declare if there are any (non-blank) named result
parameters.
But if a user writes a function with only blank result parameters and
with exactly one return statement, which is empty, then they could end
up hitting the dreaded "Value live at entry" ICE.
This CL fixes the issue by ensuring we always early declare inlined
result parameters if there are any empty return statements.
Fixes#44358.
Change-Id: I315f3853be436452883b1ce31da1bdffdf24d506
Reviewed-on: https://go-review.googlesource.com/c/go/+/293293
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/296569
1004a7cb31 runtime/metrics: update documentation to current interface
6530f2617f doc/go1.16: remove draft notice
353e111455 doc/go1.16: fix mismatched id attribute
f0d23c9dbb internal/poll: netpollcheckerr before sendfile
0cb3415154 doc: remove all docs not tied to distribution
626ef08127 doc: remove install.html and install-source.html
30641e36aa internal/poll: if copy_file_range returns 0, assume it failed
33d72fd412 doc/faq: update generics entry to reflect accepted proposal
852ce7c212 cmd/go: provide a more helpful suggestion for "go vet -?"
66c27093d0 cmd/link: fix typo in link_test.go
ff0e93ea31 doc/go1.16: note that package path elements beginning with '.' are disallowed
249da7ec02 CONTRIBUTORS: update for the Go 1.16 release
864d4f1c6b cmd/go: multiple small 'go help' fixes
26ceae85a8 spec: More precise wording in section on function calls.
930c2c9a68 cmd/go: reject embedded files that can't be packed into modules
e5b08e6d5c io/fs: allow backslash in ValidPath, reject in os.DirFS.Open
ed8079096f cmd/compile: mark concrete call of reflect.(*rtype).Method as REFLECTMETHOD
e9c9683597 cmd/go: suppress errors from 'go get -d' for packages that only conditionally exist
e0ac989cf3 archive/tar: detect out of bounds accesses in PAX records resulting from padded lengths
c9d6f45fec runtime/metrics: fix a couple of documentation typpos
cea4e21b52 io/fs: backslash is always a glob meta character
dc725bfb3c doc/go1.16: mention new vet check for asn1.Unmarshal
1901853098 runtime/metrics: fix panic in readingAllMetric example
ed3e4afa12 syscall/plan9: remove spooky fd action at a distance
724d0720b3 doc/go1.16: add missed heading tag in vet section
b54cd94d47 embed, io/fs: clarify that leading and trailing slashes are disallowed
4516afebed testing/fstest: avoid symlink-induced failures in tester
8869086d8f runtime: fix typo in histogram.go
e491c6eea9 math/big: fix comment in divRecursiveStep
fca94ab3ab spec: improve the example in Type assertions section
98f8454a73 cmd/link: don't decode type symbol in shared library in deadcode
1426a571b7 cmd/link: fix off-by-1 error in findShlibSection
32e789f4fb test: fix incorrectly laid out instructions in issue11656.go
0b6cfea634 doc/go1.16: document that on OpenBSD syscalls are now made through libc
26e29aa15a cmd/link: disable TestPIESize if CGO isn't enabled
6ac91e460c doc/go1.16: minor markup fixes
44361140c0 embed: update docs for proposal tweaks
68058edc39 runtime: document pointer write atomicity for memclrNoHeapPointers
c8bd8010ff syscall: generate readlen/writelen for openbsd libc
41bb49b878 cmd/go: revert TestScript/build_trimpath to use ioutil.ReadFile
725a642c2d runtime: correct syscall10/syscall10X on openbsd/amd64
4b068cafb5 doc/go1.16: document go/build/constraint package
376518d77f runtime,syscall: convert syscall on openbsd/arm64 to libc
Change-Id: Icfe3d849f459eda48d7d786d0cd7b082c9c2c325
The package documentation referenced sample metadata that was removed in CL 282632. Update this documentation to be less specific
about what metadata is available.
Additionally, the documentation on the Sample type referred to Descriptions instead of All as the source of metrics names.
Fixes#44280.
Change-Id: I24fc63a744bf498cb4cd5bda56c1599f6dd75929
Reviewed-on: https://go-review.googlesource.com/c/go/+/292309
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
In net/http package, the ServeContent/ServeFile doesn't check the I/O
timeout error from chunkWriter or *net.TCPConn, which means that both
HTTP status and headers might be missing when WriteTimeout happens. If
the poll.SendFile() doesn't check the *poll.FD state before sending
data, the client will only receive the response body with status and
report "malformed http response/status code".
This patch is to enable netpollcheckerr before sendfile, which should
align with normal *poll.FD.Write() and Splice().
Fixes#43822
Change-Id: I32517e3f261bab883a58b577b813ef189214b954
Reviewed-on: https://go-review.googlesource.com/c/go/+/285914
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
They have moved to x/website in CL 291693.
The docs that are left are the ones that are edited at the same time
as development in this repository and are tied to the specific version
of Go being developed. Those are:
- the language spec
- the memory model
- the assembler manual
- the current release's release notes
Change-Id: I437c4d33ada1b1716b1919c3c939c2cacf407e83
Reviewed-on: https://go-review.googlesource.com/c/go/+/291711
Trust: Russ Cox <rsc@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
On current Linux kernels copy_file_range does not correctly handle
files in certain special file systems, such as /proc. For those file
systems it fails to copy any data and returns zero. This breaks Go's
io.Copy for those files.
Fix the problem by assuming that if copy_file_range returns 0 the
first time it is called on a file, that that file is not supported.
In that case fall back to just using read. This will force an extra
system call when using io.Copy to copy a zero-sized normal file,
but at least it will work correctly.
For #36817Fixes#44272
Change-Id: I02e81872cb70fda0ce5485e2ea712f219132e614
Reviewed-on: https://go-review.googlesource.com/c/go/+/291989
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
For the command
go vet -?
the output was,
usage: go vet [-n] [-x] [-vettool prog] [build flags] [vet flags] [packages]
Run 'go help vet' for details.
Run 'go tool vet -help' for the vet tool's flags.
but "go help vet" is perfunctory at best. (That's another issue I'm
working on—see https://go-review.googlesource.com/c/tools/+/291909—
but vendoring is required to sort that out.) Add another line and rewrite
a bit to make it actually helpful:
usage: go vet [-n] [-x] [-vettool prog] [build flags] [vet flags] [packages]
Run 'go help vet' for details.
Run 'go tool vet help' for a full list of flags and analyzers.
Run 'go tool vet -help' for an overview.
Change-Id: I9d8580f0573321a57d55875ac3185988ce3eaf64
Reviewed-on: https://go-review.googlesource.com/c/go/+/291929
Trust: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This update was created using the updatecontrib command:
go get golang.org/x/build/cmd/updatecontrib
cd gotip
updatecontrib
With manual changes based on publicly available information
to canonicalize letter case and formatting for a few names.
For #12042.
Change-Id: I030b77e8ebcc7fe02106f0f264acdfb0b56e20d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/291189
Trust: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
* Link to privacy policies for proxy.golang.org and sum.golang.org in
'go help modules'. It's important that both policies are linked from
the go command's documentation.
* Fix wording and typo in 'go help vcs' following comments in CL 290992,
which adds reference documentation for GOVCS.
* Fix whitespace on GOVCS in 'go help environment'.
For #41730
Change-Id: I86abceacd4962b748361244026f219157c9285e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/291230
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
If the file won't be packed into a module,
don't put those files into embeds.
Otherwise people will be surprised when things work
locally but not when imported by another module.
Observed on CL 290709
Change-Id: Ia0ef7d0e0f5e42473c2b774e57c843e68a365bc7
Reviewed-on: https://go-review.googlesource.com/c/go/+/290809
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Rejecting backslash introduces problems with presenting
underlying OS file systems that contain names with backslash.
Rejecting backslash also does not Windows-proof the syntax,
because colon can also be a path separator. And we are not
going to reject colon from all names. So don't reject backslash
either.
There is a similar problem on Windows with names containing
slashes, but those are more difficult (though not impossible)
to create.
Also document and enforce that paths must be UTF-8.
Fixes#44166.
Change-Id: Iac7a9a268025c1fd31010dbaf3f51e1660c7ae2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/290709
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
For functions that call reflect.Type.Method (or MethodByName), we
mark it as REFLECTMETHOD, which tells the linker that methods
can be retrieved via reflection and the linker keeps all exported
methods live. Currently, this marking expects exactly the
interface call reflect.Type.Method (or MethodByName). But now the
compiler can devirtualize that call to a concrete call
reflect.(*rtype).Method (or MethodByName), which is not handled
and causing the linker to discard methods too aggressively.
Handle the latter in this CL.
Fixes#44207.
Change-Id: Ia4060472dbff6ab6a83d2ca8e60a3e3f180ee832
Reviewed-on: https://go-review.googlesource.com/c/go/+/290950
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Handles the case in which padding of a PAX record's length field
violates invariants about the formatting of record, whereby it no
longer matches the prescribed format:
"%d %s=%s\n", <length>, <keyword>, <value>
as per:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_03
0-padding, and paddings of other sorts weren't handled and we assumed
that only non-padded decimal lengths would be passed in.
Added test cases to ensure that the parsing still proceeds as expected.
The prior crashing repro:
0000000000000000000000000000000030 mtime=1432668921.098285006\n30 ctime=2147483649.15163319
exposed the fallacy in the code, that assumed that the length would ALWAYS be a
non-padded decimal length string.
This bug has existed since Go1.1 as per CL 6700047.
Thanks to Josh Bleecher Snyder for fuzzing this package, and thanks to Tom
Thorogood for advocacy, raising parity with GNU Tar, but for providing more test cases.
Fixes#40196
Change-Id: I32e0af4887bc9221481bd9e8a5120a79f177f08c
Reviewed-on: https://go-review.googlesource.com/c/go/+/289629
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
medianBucket can return if the total is greater than thresh.
However, if a histogram has no counts, total and thresh
will both be zero and cause panic.
Adding an equal sign to prevent the potential panic.
Fixes#44148
Change-Id: Ifb8a781990f490d142ae7c035b4e01d6a07ae04d
Reviewed-on: https://go-review.googlesource.com/c/go/+/290171
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Change Plan 9 fork/exec to use the O_CLOEXEC file
descriptor, instead of relying on spooky at a
distance.
Historically, Plan 9 has set the O_CLOEXEC flag on
the underlying channels in the kernel, rather
than the file descriptors -- if two fds pointed
at a single channel, as with dup, changing the
flags on one of them would be observable on the
other.
The per-Chan semantics are ok, if unexpected,
when a chan is only handled within a single
process, but this isn't always the case.
Forked processes share Chans, but even more of
a problem is the interaction between /srv and
OCEXEC, which can lead to unexectedly closed
file descriptors in completely unrelated
proceses. For example:
func exists() bool {
// If some other thread execs here,
// we don't want to leak the fd, so
// open it O_CLOEXEC
fd := Open("/srv/foo", O_CLOEXEC)
if fd != -1 {
Close(fd)
return true
}
return false
}
would close the connection to any file descriptor
(maybe even for the root fs) in ALL other processes
that have it open if an exec were to happen(!),
which is quite undesriable.
As a result, 9front will be changing this behavior
for the next release.
Go is the only code observed so far that relies on
this behavior on purpose, and It's easy to make the
code work with both semantics: simply using the file
descriptor that was opened with O_CEXEC instead of
throwing it away.
So we do that here.
Fixes#43524
Change-Id: I4887f5c934a5e63e5e6c1bb59878a325abc928d3
GitHub-Last-Rev: 96bb21bd1e
GitHub-Pull-Request: golang/go#43533
Reviewed-on: https://go-review.googlesource.com/c/go/+/281833
Reviewed-by: David du Colombier <0intro@gmail.com>
Reviewed-by: Richard Miller <millerresearch@gmail.com>
Reviewed-by: Jacob Moody <j4kem00dy@gmail.com>
Run-TryBot: David du Colombier <0intro@gmail.com>
Trust: Ian Lance Taylor <iant@golang.org>
There appears to be a typo in the description of
the recursive division algorithm.
Two things seem suspicious with the original comment:
1. It is talking about choosing s, but s doesn't
appear anywhere in the equation.
2. The math in the equation is incorrect.
Where
B = len(v)/2
s = B - 1
Proof that it is incorrect:
len(v) - B >= B + 1
len(v) - len(v)/2 >= len(v)/2 + 1
This doesn't hold if len(v) is even, e.g. 10:
10 - 10/2 >= 10/2 + 1
10 - 5 >= 5 + 1
5 >= 6 // this is false
The new equation will be the following,
which will be mathematically correct:
len(v) - s >= B + 1
len(v) - (len(v)/2 - 1) >= len(v)/2 + 1
len(v) - len(v)/2 + 1 >= len(v)/2 + 1
len(v) - len(v)/2 >= len(v)/2
This holds if len(v) is even or odd.
e.g. 10
10 - 10/2 >= 10/2
10 - 5 >= 5
5 >= 5
e.g. 11
11 - 11/2 >= 11/2
11 - 5 >= 5
6 >= 5
Change-Id: If77ce09286cf7038637b5dfd0fb7d4f828023f56
Reviewed-on: https://go-review.googlesource.com/c/go/+/287372
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Katie Hockman <katie@golang.org>
The example, var v, ok T1 = x.(T), can be interpreted as type T1 interface{} or type T = bool; type T1 = T.
Separating the example would help understanding for readers.
Change-Id: I179f4564e67f4d503815d29307df2cebb50c82f9
GitHub-Last-Rev: b34fffb6bb
GitHub-Pull-Request: golang/go#44040
Reviewed-on: https://go-review.googlesource.com/c/go/+/288472
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Robert Griesemer <gri@golang.org>
In the linker's deadcode pass we decode type symbols for
interface satisfaction analysis. When linking against Go shared
libraries, the type symbol may come from a shared library, so it
doesn't have data in the current module being linked, so we cannot
decode it. We already have code to skip DYNIMPORT symbols. However,
this doesn't actually work, because at that point the type symbols'
names haven't been mangled, whereas they may be mangled in the
shared library. So the symbol definition (in shared library) and
reference (in current module) haven't been connected.
Skip decoding type symbols of type Sxxx (along with DYNIMPORT)
when linkShared.
Note: we cannot skip all type symbols, as we still need to mark
unexported methods defined in the current module.
Fixes#44031.
Change-Id: I833d19a060c94edbd6fc448172358f9a7d760657
Reviewed-on: https://go-review.googlesource.com/c/go/+/288496
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
CL 279423 introduced a regression in this test as it incorrectly laid
out various instructions. In the case of arm, the second instruction
was overwriting the first. In the case of 386, amd64 and s390x, the
instructions were being appended to the end of the slice after 64
zero bytes.
This was causing test failures on "linux/s390x on z13".
Fixes#44028
Change-Id: Id136212dabdae27db7e91904b0df6a3a9d2f4af4
Reviewed-on: https://go-review.googlesource.com/c/go/+/288278
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
memclrNoHeapPointers is the underlying implementation of
typedmemclr and memclrHasPointers, so it still needs to write
pointer-aligned words atomically. Document this requirement.
Updates #41428.
Change-Id: Ice00dee5de7a96a50e51ff019fcef069e8a8406a
Reviewed-on: https://go-review.googlesource.com/c/go/+/287692
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This call was changed to os.ReadFile in CL 266365, but the test also
builds that source file using gccgo if present, and released versions
of gccgo do not yet support ioutil.ReadFile.
Manually tested with gccgo gccgo 10.2.1 (see #35786).
Fixes#43974.
Updates #42026.
Change-Id: Ic4ca0848d3ca324e2ab10fd14ad867f21e0898e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/287613
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
The syscall10/syscall10X implementation uses an incorrect stack offset for
arguments a7 to a10. Correct this so that the syscall arguments work as
intended.
Updates #36435Fixes#43927
Change-Id: Ia7ae6cc8c89f50acfd951c0f271f3b3309934499
Reviewed-on: https://go-review.googlesource.com/c/go/+/287252
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
We add entries to the defer list at panic/goexit time on-the-fly for
frames with open-coded defers. We do this so that we can correctly
process open-coded defers and non-open-coded defers in the correct order
during panics/goexits. But we need to remove entries for open-coded
defers from the defer list when there is a recover, since those entries
may never get removed otherwise and will get stale, since their
corresponding defers may now be processed normally (inline).
This bug here is that we were only removing higher-up stale entries
during a recover if all defers in the current frame were done. But we
could have more defers in the current frame (as the new test case
shows). In this case, we need to leave the current defer entry around
for use by deferreturn, but still remove any stale entries further along
the chain.
For bug 43921, simple change that we should abort the removal loop for
any defer entry that is started (i.e. in process by a still
not-recovered outer panic), even if it is not an open-coded defer.
This change does not fix bug 43920, which looks to be a more complex fix.
Fixes#43882Fixes#43921
Change-Id: Ie05b2fa26973aa26b25c8899a2abc916090ee4f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/286712
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
With CGO disabled, the test suite tries to run the following and fail:
CGO_ENABLED=0 go test -run=TestScript/link_syso_issue33139 cmd/go
go test proxy running at GOPROXY=http://127.0.0.1:38829/mod
--- FAIL: TestScript (0.01s)
--- FAIL: TestScript/link_syso_issue33139 (0.01s)
script_test.go:215:
# Test that we can use the external linker with a host syso file that is
# embedded in a package, that is referenced by a Go assembly function.
# See issue 33139. (0.000s)
# External linking is not supported on linux/ppc64.
# See: https://github.com/golang/go/issues/8912 (0.000s)
# External linking is not supported on linux/riscv64.
# See: https://github.com/golang/go/issues/36739 (0.001s)
> [linux] [riscv64] skip
> cc -c -o syso/objTestImpl.syso syso/src/objTestImpl.c
FAIL: testdata/script/link_syso_issue33139.txt:15:
unexpected error starting command:
fork/exec /dev/null: permission denied
CC was set to /dev/null (during build) in the scenario mentioned above
This patch replaces [!exec:cc] with [!cgo] because we care about the
availability of the 'cc' builtin and not the 'cc' executable in $PATH
Change-Id: Ifbd2441f5f8e903ca3da213aba76f44c2e2eebab
GitHub-Last-Rev: 3b743787d0
GitHub-Pull-Request: golang/go#43912
Reviewed-on: https://go-review.googlesource.com/c/go/+/286633
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The mkasm_darwin.go file was renamed to mkasm.go in CL 270380, with OpenBSD
support being added. The mkasm_openbsd.go file should not have been merged,
so remove it. Fix up references to mkasm_$GOOS.go and provide $GOOS as an
argument on invocation.
Updates #36435
Change-Id: I868d3f2146973d026e6a663d437749dbb6b312ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/286812
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
NewFile requires the file descriptor to be either closed
through the returned File instance, or to stay valid at least
until the finalizer runs during garbage collection.
These requirements are easily violated when file descriptors
are closed via unix.Close, or when the *File returned by
NewFile is garbage collected while the underlying file descriptor is
still in use.
This commit adds further documentation for NewFile and Fd, making it
explicit that using naked file descriptors is subject to constraints
due to garbage collection of File objects.
Fixes#43863
Change-Id: I49ea1f0054eb2d2a72b616450c8e83476f4d07fb
GitHub-Last-Rev: 180d0130ae
GitHub-Pull-Request: golang/go#43867
Reviewed-on: https://go-review.googlesource.com/c/go/+/286032
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The race reported in issue #41167 was detected only because the
ReadWriter used in test code happened to be a bytes.Buffer whose
Read and Write operate (unsafely) on shared state. This is not the
case in any realistic scenario where the FastCGI protocol is spoken
over sockets or pairs of pipes.
Since tests that use nopWriteCloser don't care about any output
generate by child.Serve(), we change nopWriteCloser to provide
a dummy Write method.
Remove the locking added in CL 252417, since it causes a deadlock
during write as reported in #43901. The race in tests no longer
happens thanks to the aforementioned change to nopWriteCloser.
Fixes#43901.
Updates #41167.
Change-Id: I8cf31088a71253c34056698f8e2ad0bee9fcf6c6
GitHub-Last-Rev: b06d8377fd
GitHub-Pull-Request: golang/go#43027
Reviewed-on: https://go-review.googlesource.com/c/go/+/275692
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
CL 261677 fixed a logic issue in walk's alias detection, where it was
checking the RHS expression instead of the LHS expression when trying
to determine the kind of assignment. However, correcting this exposed
a latent issue with assigning to result parameters in functions with
defers, where an assignment could become visible earlier than intended
if a later expression could panic.
Fixes#43835.
Change-Id: I061ced125e3896e26d65f45b28c99db2c8a74a8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/285633
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
This reverts CLs 274450 and 279492, except for the new tests.
The new race test is changed to skip, as it now fails.
We can try again for 1.17.
Original CL descriptions:
html/template: attach functions to namespace
The text/template functions are stored in a data structure shared by
all related templates, so do the same with the original, unwrapped,
functions on the html/template side.
html/template: avoid race when escaping updates template
For #39807Fixes#43855
Change-Id: I2ce91321ada06ea496a982aefe170eb5af9ba847
Reviewed-on: https://go-review.googlesource.com/c/go/+/285957
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Currently the only mention of go_asm.h is buried in a confusing
section about the runtime-specific go_tls.h header. We actually want
people to use go_asm.h, so this CL adds a section with a proper
discussion of this header. As part of this, we remove the discussion
of go_asm.h from the go_tls.h section and clean up what remains.
I stumbled on this when working on the internal ABI specification. I
wanted to refer to stable documentation on how to access struct fields
from assembly and found there was none.
Change-Id: I0d53741e7685e65794611939e76285f7c82e1d65
Reviewed-on: https://go-review.googlesource.com/c/go/+/286052
Trust: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
FindFileNext sometimes returns a different mtime than looking at the
file directly, because the MFT on NTFS is written to lazily. In order to
keep these in sync, we use GetFileInformationByHandle to get the actual
mtime, and then write it back to the file explicitly.
Fixes#42637.
Change-Id: I774016d3ac55d0dc9b0f9c1b681516c33ba0d28a
Reviewed-on: https://go-review.googlesource.com/c/go/+/285720
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The VMOVQ instruction moves a 128-bit constant into a V register, as 128-bit
constant can't be loaded into a register directly, we split it into two 64-bit
constants and load it from constant pool. Currently we add the 128-bit constant
to literal pool by calling the 'addpool' function twice, this is not the right
way because it doesn't guarantee the two DWORD instructions are consecutive,
and the second call of addpool will overwrite the p.Pool field,resulting in a
wrong PC-relative offset value of the Prog.
This CL renames the flag LFROM3 to LFROM128, and adds a new function addpool128
to add a 128-bit constant to the literal pool.
Change-Id: I616f043c99a9a18a663f8768842cc980de2e6f79
Reviewed-on: https://go-review.googlesource.com/c/go/+/282334
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: eric fang <eric.fang@arm.com>
Trust: eric fang <eric.fang@arm.com>
This was removed in change 285692, however we need to explicitly pull libc.so
in when libpthread.so is being used. The current code works on openbsd/amd64
since we pull libc.so in via runtime/sys_openbsd2.go, however openbsd/arm64
does not do this currently.
Change-Id: Ibe93d936a22e69e2fe12620f6d27ccca7a91dba5
Reviewed-on: https://go-review.googlesource.com/c/go/+/285912
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
The example for WriteFile assumed the existence of a testdata/ directory, which is not present on the playground. The example now writes the file to the current working directory, rather than to testdata/.
Fixes#32916
Change-Id: I577caac7e67ba9d9941b2dd19346ad5ff61e78d9
GitHub-Last-Rev: 40f14e0adc
GitHub-Pull-Request: golang/go#43757
Reviewed-on: https://go-review.googlesource.com/c/go/+/284452
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
In msan mode we instrument code with msan* functions, including
msanmove. In some configurations the code is instrumented by the
compiler but msan is not actually linked in, so we need dummy
definitions for those functions so the program links. msanmove is
newly added in CL 270859 but a dummy definition in msan0.go was
not added, causing link failures. Add it.
Change-Id: I91f8e749919f57f1182e90b43412b0282cf4767c
Reviewed-on: https://go-review.googlesource.com/c/go/+/285955
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In the signal handler, we adjust gsingal's stack to the stack
where the signal is delivered. TSAN may deliver signals to the
g0 stack, so we have a special case for the g0 stack. However,
we don't have very good accuracy in determining the g0 stack's
bounds, as it is system allocated and we don't know where it is
exactly. If g0.stack.lo is too low, the condition may be
triggered incorrectly, where we thought the signal is delivered to
the g0 stack but it is actually not. In this case, as the stack
bounds is actually wrong, when the stack grows, it may go below
the (inaccurate) lower bound, causing "morestack on gsignal"
crash.
Check for g0 stack last to avoid this situation. There could still
be false positives, but for those cases we'll crash either way.
(If we could in some way determine the g0 stack bounds accurately,
this would not matter (but probably doesn't hurt).)
Fixes#43853.
Change-Id: I759717c5aa2b0deb83ffb23e57b7625a6b249ee8
Reviewed-on: https://go-review.googlesource.com/c/go/+/285772
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Previously, if CC was a path without separators (like gcc or clang),
we'd look it up in PATH in cmd/go using internal/execabs.LookPath,
then pass the resolved path to cgo in CC.
This caused a regression: if the directory in PATH containing CC has a
space, cgo splits it and interprets it as multiple arguments.
With this change, cmd/go no longer resolves CC before invoking
cgo. cgo does the path lookup on each invocation. This reverts the
security fix CL 284780, but that was redundant with the addition of
internal/execabs (CL 955304), which still protects us.
Fixes#43808
Updates #41400
Change-Id: I65d91a1e303856df8653881eb6e2e75a3bf95c49
Reviewed-on: https://go-review.googlesource.com/c/go/+/285873
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The TestEmbedPatterns, TestEmbedFiles, XTestEmbedPatterns, and
XTestEmbedFiles fields were left out of golang.org/cl/282195 which was
supposed to document the embed fields available in the go list
output. Add documentation for them in this CL.
Fixes#43081
Change-Id: Ifc256c476daec7c0f0e2c41f86b82f958b3e2b1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/284258
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This patch fixes two independent bugs in p224Contract, the function that
performs the final complete reduction in the P-224 field. Incorrect
outputs due to these bugs were observable from a high-level
P224().ScalarMult() call.
The first bug was in the calculation of out3GT. That mask was supposed
to be all ones if the third limb of the value is greater than the third
limb of P (out[3] > 0xffff000). Instead, it was also set if they are
equal. That meant that if the third limb was equal, the value was always
considered greater than or equal to P, even when the three bottom limbs
were all zero. There is exactly one affected value, P - 1, which would
trigger the subtraction by P even if it's lower than P already.
The second bug was more easily hit, and is the one that caused the known
high-level incorrect output: after the conditional subtraction by P, a
potential underflow of the lowest limb was not handled. Any values that
trigger the subtraction by P (values between P and 2^224-1, and P - 1
due to the bug above) but have a zero lowest limb would produce invalid
outputs. Those conditions apply to the intermediate representation
before the subtraction, so they are hard to trace to precise inputs.
This patch also adds a test suite for the P-224 field arithmetic,
including a custom fuzzer that automatically explores potential edge
cases by combining limb values that have various meanings in the code.
contractMatchesBigInt in TestP224Contract finds the second bug in less
than a second without being tailored to it, and could eventually find
the first one too by combining 0, (1 << 28) - 1, and the difference of
(1 << 28) and (1 << 12).
The incorrect P224().ScalarMult() output was found by the
elliptic-curve-differential-fuzzer project running on OSS-Fuzz and
reported by Philippe Antoine (Catena cyber).
Fixes CVE-2021-3114
Fixes#43786
Change-Id: I50176602d544de3da854270d66a293bcaca57ad7
Reviewed-on: https://go-review.googlesource.com/c/go/+/284779
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Expand the scope of the TestAllDependenciesVendored test to check
that all modules in GOROOT are tidy, that packages are vendored,
the vendor content matches the upstream copy exactly, and that
bundled packages are re-generated (using x/tools/cmd/bundle at
the version selected in cmd module; this is deterministic and
guaranteed to be updated over time).
This is done in a conceptually simple way:
1. Make a temporary copy of the entire GOROOT tree (except .git),
one that is safe to modify.
2. Run a list of high-level commands, the same commands we expect
Go developers should be able to run in a normal complete GOROOT
tree to make it clean and tidy.
3. Diff the end result with the original GOROOT tree being tested
to catch any unexpected differences.
The current set of commands that are run require the cmd/go command,
and a functional compiler itself (because re-generating the syscall
package involves a directive like //go:generate go run [...]). As a
result, copying a large majority of the GOROOT tree is a requirement.
Instead of looking for the few files or directories that can we can
get away not copying (e.g., the testdata directories aren't strictly
needed at this time), we opt not to optimize and just do the simple
copy. This is motivated by these reasons:
• We end up having a complete, normal GOROOT tree, one that happens
to be located at another path. There's a very high likelihood that
module management/code generation commands, both the ones we run
today and any additional ones that we might want to add in the
future, will result in correct results even as the Go project
evolves over time.
• Having a completely stand-alone copy of the GOROOT tree without
symlinks minimizes the risk of some of the module management/code
generation commands, either now or in the future, from modifying
the user's original GOROOT tree, something that should not happen
during test execution. Overlays achieved with symlinks work well
when we can guarantee only new files are added, but that isn't
the case here.
• Copying the entire GOROOT (without .git), takes around 5 seconds
on a fairly modern computer with an SSD. The most we can save is
a couple of seconds.
(We make some minor exceptions: the GOROOT/.git directory isn't copied,
and GOROOT/{bin,pkg} are deemed safe to share and thus symlink instead
of copying. If these optimizations cease to be viable to make, we'll
need to remove them.)
Since this functionality is fairly expensive to execute and requires
network access, it runs only when the test is executed without -short
flag. The previous behavior of the TestAllDependenciesVendored test is
kept in -short test mode. all.bash runs package tests with -short flag,
so its behavior is unchanged. The expectation is that the new test will
run on some of the longtest builders to catch problems. Users can invoke
the test manually 'go test cmd/internal/moddeps' (and it's run as part
of 'go test cmd', again, only when -short flag isn't provided).
On a 2017 MacBook Pro, a successful long test takes under 15 seconds,
which should be within scope of all long tests that are selected by
'go test std cmd'. We may further adjust when and where the test runs
by default based on our experience.
Fixes#36852.
Fixes#41409.
Fixes#43687.
Updates #43440.
Change-Id: I9eb85205fec7ec62e3f867831a0a82e3c767f618
Reviewed-on: https://go-review.googlesource.com/c/go/+/283643
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Before this CL, the following sequence was possible:
* GC scavenger starts and sets up scavenge.timer
* GC calls readyForScavenger, but sysmon is sleeping
* program calls runtime.GOMAXPROCS to shrink number of processors
* procresize destroys a P, the one that scavenge.timer is on
* (*pp).destroy calls moveTimers, which gets to the scavenger timer
* scavenger timer is timerWaiting, and moveTimers clears t.pp
* sysmon wakes up and calls wakeScavenger
* wakeScavengers calls stopTimer on scavenger.timer, still timerWaiting
* stopTimer calls deltimer which loads t.pp, which is still nil
* stopTimer tries to increment deletedTimers on nil t.pp, and crashes
The point of vulnerability is the time that t.pp is set to nil by
moveTimers and the time that t.pp is set to non-nil by moveTimers,
which is a few instructions at most. So it's not likely and in
particular is quite unlikely on x86. But with a more relaxed memory
model the area of vulnerability can be somewhat larger. This appears
to tbe the cause of two builder failures in a few months on linux-mips.
This CL fixes the problem by making moveTimers change the status from
timerWaiting to timerMoving while t.pp is clear. That will cause
deltimer to wait until the status is back to timerWaiting, at which
point t.pp has been set again.
Fixes#43712
Change-Id: I66838319ecfbf15be66c1fac88d9bd40e2295852
Reviewed-on: https://go-review.googlesource.com/c/go/+/284775
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
If a package vendored with go mod vendor depends on embedded
files contained in subdirectories, copy them into the the
corresponding place in the module's vendor tree. (Embeds in
parent directories are disallowed by the embed pattern rules, and
embeds in the same directory are copied because go mod vendor
already copies the non-go files in the package's own directory).
Export the vendor pattern expansion code in internal/load so
internal/modcmd's vendor code can use it.
Fixes#43077
Change-Id: I61edb344d73df590574a6498ffb6069e8d72a147
Reviewed-on: https://go-review.googlesource.com/c/go/+/283641
Trust: Michael Matloob <matloob@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This will produce better errors when earlier versions of
Go compile code using //go:embed. (The import will cause
a compilation error but then the go command will add to
the output that the Go toolchain in use looks too old
and maybe that's the problem.)
This CL also adds a test for disallowing embed of a var inside a func.
It's a bit too difficult to rebase down into that CL.
The build system configuration check is delayed in order to
make it possible to use errorcheck for these tests.
Change-Id: I12ece4ff2d8d53380b63f54866e8f3497657d54c
Reviewed-on: https://go-review.googlesource.com/c/go/+/282718
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
If there are already errors emitted, don't run the Asmb2 pass
and just exit. At the point of Asmb2 relocations are already
resolved and errors should have been reported, if any. Asmb2 is
unlikely to emit additional useful users errors. Instead, the
invalid input may cause inconsistencies and crash the linker, or
it may emit some internal errors which are more confusing than
helpful. Exit on error before Asmb2.
Fixes#43748.
Change-Id: Icf6e27f2eef5b6259e921ec0e64bebad5dd805f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/284576
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Rather than repeat long lists of GOOS values, factor out the code that checks
if a runtime starts on a system allocated stack. Note that this adds aix to
one case, which appears to have been previously missed.
Change-Id: I5cecb0bb47dd79cde8d723e5a42ba541e43cbfff
Reviewed-on: https://go-review.googlesource.com/c/go/+/250179
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Calls to lock may need to use global members of mOS that also need to be
cleaned up before the thread exits. Before this commit, these resources
would leak. Moving them to be cleaned up in unminit, however, would race
with gstack on unix. So this creates a new helper, mdestroy, to release
resources that must be destroyed only after locks are no longer
required. We also move highResTimer lifetime to the same semantics,
since it doesn't help to constantly acquire and release the timer object
during dropm.
Updates #43720.
Change-Id: Ib3f598f3fda1b2bbcb608099616fa4f85bc1c289
Reviewed-on: https://go-review.googlesource.com/c/go/+/284137
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
By calling NewConsoleFile on syscall.Stdin, we wind up closing it when
the function returns, which causes errors when all the tests are run in
a loop. To fix this, we instead create a duplicate handle of stdin.
Fixes#43720.
Change-Id: Ie6426e6306c7e1e39601794f4ff48bbf2fe67502
Reviewed-on: https://go-review.googlesource.com/c/go/+/284140
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Tests should avoid writing to GOROOT when possible. Such writes
would fail if GOROOT is non-writeable, and it can interfere with
other tests that don't expect GOROOT to change during test execution.
Updates #28387.
Change-Id: I7d72614f218df3375540f5c2f9c9f8c11034f602
Reviewed-on: https://go-review.googlesource.com/c/go/+/284293
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The current implementation requires saying "string" or "[]byte"
and disallows aliases, defined types, and even "[]uint8".
This was not 100% intended and mostly just fell out of when
the checks were being done in the implementation (too early,
before typechecking).
After discussion on #43217 (forked into #43602),
the consensus was to allow all string and byte slice types,
same as we do for string conversions in the language itself.
This CL does that.
It's more code than you'd expect because the decision has
to be delayed until after typechecking.
But it also more closely aligns with the version that's
already on dev.regabi.
Fixes#43602.
Change-Id: Iba919cfadfbd5d7116f2bf47e2512fb1d5c36731
Reviewed-on: https://go-review.googlesource.com/c/go/+/282715
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Allowing embedding into []byte inside a func creates an
unfortunate problem: either all calls start with the same
underlying data and can see each other's changes to the
underlying data (surprising and racy!) or all calls start
by making their own copy of the underlying data
(surprising and expensive!).
After discussion on #43216, the consensus was to remove
support for all vars embedded inside functions.
Fixes#43216.
Change-Id: I01e62b5f0dcd9e8566c6d2286218e97803f54704
Reviewed-on: https://go-review.googlesource.com/c/go/+/282714
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The docs were never updated for the change to the placement
of the DO NOT EDIT line.
Also, the description of the DO NOT EDIT line interrupted the
description of the //go:generate line, which made for some
confusing references in the text that followed. Move it lower.
Fixes#41196.
Change-Id: I6af2a199fa98d45f5ccac7cdf7e9e54257699e61
Reviewed-on: https://go-review.googlesource.com/c/go/+/283633
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
There's on need to expose this to the frozen syscall package, and it
also doesn't need to be unsafe. So we move it into internal/syscall and
have the generator make a safer function signature.
Fixes#43704.
Change-Id: Iccae69dc273a0aa97ee6846eb537f1dc1412f2de
Reviewed-on: https://go-review.googlesource.com/c/go/+/283992
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Previously, testKillProcess needlessly invoked processKiller in a
separate goroutine and failed to wait for that goroutine to complete,
causing the calls to t.Fatalf in that goroutine to potentially occur
after the test function had already returned.
Fixes#43722
Change-Id: I5d03cb24af51bb73f0ff96419dac57ec39776967
Reviewed-on: https://go-review.googlesource.com/c/go/+/284153
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
On Apple Silicon Mac, the C compiler has an annoying default
target selection, depending on the ancestor processes'
architecture. In particular, if the shell or IDE is x86, when
running "go build" even with a native ARM64 Go toolchain, the C
compiler defaults to x86, causing build failures. We pass "-arch"
flag explicitly to avoid this situation.
Fixes#43692.
Fixes#43476.
Updates golang/vscode-go#1087.
Change-Id: I80b6a116a114e11e273c6886e377a1cc969fa3f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/283812
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The cgo header has an unnecessary space in the exported function
definition on non-windows goos.
This was introduced in go1.16 so it would be good to fix it before
release.
Example:
// Current behavior, notice there is an unecessary space
// between extern and void
extern void Foo();
// With this CL
extern void Foo();
Change-Id: Ic2c21f8d806fe35a7be7183dbfe35ac605b6e4f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/283892
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Katie Hockman <katie@golang.org>
Consider the following example,
func test(a, b float64, x uint64) uint64 {
if a < b {
x = 0
}
return x
}
func main() {
fmt.Println(test(1, math.NaN(), 123))
}
The output is 0, but the expectation is 123.
This is because the rewrite rule
(CSEL [cc] (MOVDconst [0]) y flag) => (CSEL0 [arm64Negate(cc)] y flag)
converts
FCMP NaN, 1
CSEL MI, 0, 123, R0 // if 1 < NaN then R0 = 0 else R0 = 123
to
FCMP NaN, 1
CSEL GE, 123, 0, R0 // if 1 >= NaN then R0 = 123 else R0 = 0
But both 1 < NaN and 1 >= NaN are false. So the output is 0, not 123.
The root cause is arm64Negate not handle negation of floating comparison
correctly. According to the ARM manual, the meaning of MI, GE, and PL
are
MI: Less than
GE: Greater than or equal to
PL: Greater than, equal to, or unordered
Because NaN cannot be compared with other numbers, the result of such
comparison is unordered. So when NaN is involved, unlike integer, the
result of !(a < b) is not a >= b, it is a >= b || a is NaN || b is NaN.
This is exactly what PL means. We add NotLessThanF to represent PL. Then
the negation of LessThanF is NotLessThanF rather than GreaterEqualF. The
same reason for the other floating comparison operations.
Fixes#43619
Change-Id: Ia511b0027ad067436bace9fbfd261dbeaae01bcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/283572
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Keith Randall <khr@golang.org>
Renamed setErrorPos to setPos, made it a method of PackageError,
and removed its Package parameter and return value. This makes it
more clear that setPos modifies PackageError and does not create a new
Package.
Change-Id: I26c58d3d456c7c18a5c2598e1e8e158b1e6b4b36
Reviewed-on: https://go-review.googlesource.com/c/go/+/283637
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
When a command fails due to a module zip sum missing from go.sum,
if the module is in the build list, the go command will print a
'go mod download' command the user can run to fix it.
Previously, a hint was only printed if the module provided a package
in 'all'. We don't print a 'go get' hint, since we may not want to add
a new requirement to go.mod.
Fixes#43572
Change-Id: I88c61b1b42ad56c04e4482f6a1bb97ce758aaeff
Reviewed-on: https://go-review.googlesource.com/c/go/+/282712
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
For some reason (that I didn't look into), externally linked
AIX binaries don't have runtime.symtab symbol. Since recent Go
releases (Go 1.3 maybe?), that symbol is empty and not necessary
anyway. Don't require it.
Fixes#40972.
Change-Id: I73a1f0142195ea6debdba8a4f6e12cadc3980dc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/279995
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Module-related help pages now contain a brief summary and point to the
reference documentation at golang.org/ref/mod for details.
Help pages for commands like 'go get' still describe the basic usage
and summarize flags but don't provide as much background detail.
Fixes#41427Fixes#43419
Change-Id: Icacd38e0f33c352c447cc5a496c99674493abde2
Reviewed-on: https://go-review.googlesource.com/c/go/+/282615
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
* All commands the user can run to fix the problem now appear alone on
a separate line after a tab.
* Removed -d from 'go get' commands.
* Replaced 'go mod tidy' with 'go mod download $modpath' when a
package might be provided by a module missing a sum.
* Errors about 'path@version' syntax are more explicit.
Fixes#29415Fixes#42087Fixes#43430Fixes#43523
Change-Id: I4427c2c4506a727a2c727d652fd2d506bb134d3b
Reviewed-on: https://go-review.googlesource.com/c/go/+/282121
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Previously, commands that wrote go.sum (except 'go mod tidy') would
retain sums for zip files of directly required modules. Sums of
indirect dependencies wouldn't be retained unless they were used to
load packages.
With this change, sums for indirect dependencies will be retained if
they're available. This allows users to add missing sums with
'go mod download example.com/mod', which previously only worked for
directly required modules.
Note that 'go mod download' without arguments now adds sums for every
module in the build list. That matches 1.15 behavior.
For #41103
Change-Id: I4cce2bf1c73578dae836bdb5adb32da071554f1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/282692
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
This change removes the as-of-yet unused StopTheWorld field in the
Description struct. Adding a new field to a struct is much easier than
removing it, so let's save it for when we actually need it.
Change-Id: I8074b8569187c1a148500575fa8a661534e875d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/282632
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
I have a real 7,000-line Go program (not so big)
that took over two minutes to report a trivial init cycle.
I thought the compiler was in an infinite loop but
it was actually just very slow.
CL 170062 rewrote init cycle reporting but replaced
a linear-time algorithm with an exponential one:
it explores all paths through the call graph of functions
involved in the cycle.
The net effect was that Go 1.12 took 0.25 seconds to load,
typecheck, and then diagnose the cycle in my program,
while Go 1.13 takes 600X longer.
This CL makes the new reporting code run in linear time,
restoring the speed of Go 1.12 but preserving the semantic
fixes from CL 170062.
Change-Id: I7d6dc95676d577d9b96f5953b516a64db93249bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/282314
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
When running go tool compile,
go tool is running compile as a subprocess.
Killing go tool with Process.Kill leaves the subprocess behind.
Send an interrupt signal first, which it can forward on
to the compile subprocess.
Also report the timeout in errorcheck -t.
Change-Id: I7ae0029bbe543ed7e60e0fea790dd0739d10bcaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/282313
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This way, if a SIGINT is sent to the go command,
it is forwarded on to the underlying tool.
Otherwise trying to use os.Process.Signal to kill
"go tool compile" only kills the "go tool" not the "compile".
Change-Id: Iac7cd4f06096469f5e76164df813a379c0da3822
Reviewed-on: https://go-review.googlesource.com/c/go/+/282312
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This package implements a parser for the new //go:build constraint lines.
The parser also handles // +build lines, to be able to process legacy files.
This will not be used in the standard library until Go 1.17,
but it seems worth publishing in Go 1.16 so that code that
needs to process both kinds of lines once Go 1.17 comes out
will be able to build using Go 1.16 as well.
For #41184. Design in https://golang.org/design/draft-gobuild.
Change-Id: I756c0de4081c5039e8b7397200e5274f223ab111
Reviewed-on: https://go-review.googlesource.com/c/go/+/240604
Run-TryBot: Russ Cox <rsc@golang.org>
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Trust: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The testing.TestFS function assumes that the file system it's testing
doesn't change under it. Clarify this in the documentation and fix the
use of os.TestDirFS that's currently susceptible to this race.
Fixes#42637.
Change-Id: Ia7792380726177f8953d150ee87381b66cb01cb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/282452
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
This change modifies the *-by-size metrics' units to be based off the
bucket's unit (bytes) as opposed to the unit of the counts (objects).
This convention is more in-line with distributions in other metrics
systems.
Change-Id: Id3b68a09f52f0e1ff9f4346f613ae1cbd9f52f73
Reviewed-on: https://go-review.googlesource.com/c/go/+/282352
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
The documentation for Glob was copied from filepath.Glob, and needs a bit
of tweaking: paths are not rooted at slash; the separator is always '/'.
Fixes#43537
Change-Id: Id64daa137e2762b66a82a5b9e60bbe603f4e2f5c
Reviewed-on: https://go-review.googlesource.com/c/go/+/282173
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Current optimization: When we copy a->b and then b->c, we might as well
copy a->c instead of b->c (then b might be dead and go away).
*Except* if a is a volatile location (might be clobbered by a call).
In that case, we really do want to copy a immediately, because there
might be a call before we can do the a->c copy.
User calls can't happen in between, because the rule matches up the
memory states. But calls inserted for memory barriers, particularly
runtime.typedmemmove, can.
(I guess we could introduce a register-calling-convention version
of runtime.typedmemmove, but that seems a bigger change than this one.)
Fixes#43570
Change-Id: Ifa518bb1a6f3a8dd46c352d4fd54ea9713b3eb1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/282492
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This change modifies the semantics of
runtime/metrics.Float64Histogram.Buckets to remove implicit buckets to
that extend to positive and negative infinity and instead defines all
bucket boundaries as explicitly listed.
Bucket boundaries remain the same as before except
/gc/heap/allocs-by-size:objects and /gc/heap/frees-by-size:objects no
longer have a bucket that extends to negative infinity.
This change simplifies the Float64Histogram API, making it both easier
to understand and easier to use.
Also, add a test for allocs-by-size and frees-by-size that checks them
against MemStats.
Fixes#43443.
Change-Id: I5620f15bd084562dadf288f733c4a8cace21910c
Reviewed-on: https://go-review.googlesource.com/c/go/+/281238
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
golang.org/cl/251878 disallowed non-ASCII characters in import paths,
in module mode. They were already disallowed in module paths, so this
change just extended the restriction to the package subdirectory of
the module. Update the release notes to alert users of this change.
Fixes#43052
Change-Id: I1caf9ef978dd3ac599a3f82c5c376ad62e6fc436
Reviewed-on: https://go-review.googlesource.com/c/go/+/282194
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
For the example in #43551, before late call expansion, the OpArg type is
decomposed to int64. But the late call expansion is currently decompose
it to "x.Key" instead.
This CL make expand_calls decompose further for struct { 1-field type }
and array [1]elem.
This matches the previous rules for early decompose args:
(StructSelect (StructMake1 x)) => x
(ArraySelect (ArrayMake1 x)) => x
Fixes#43551
Change-Id: I2f1ebe18cb81cb967f494331c3d237535d2859e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/282332
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
In general, we don't want to encourage reading them from CSRs, and
applications that really want to can parse the Extensions field.
Note that this also fixes a bug where the error of
parseKeyUsageExtension was not handled in parseCertificateRequest.
Fixes#43477
Updates #37172
Change-Id: Ia5707b0e23cecc0aed57e419a1ca25e26eea6bbe
Reviewed-on: https://go-review.googlesource.com/c/go/+/281235
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
Fix a deadlock in DumpRequestOut which can occur if the request is
cancelled between response being sent and it being processed.
Also:
* Ensure we don't get a reader leak when an error is reported by the
transport before the body is consumed.
* Add leaked goroutine retries to avoid false test failures.
Fixes#38352
Change-Id: I83710791b2985b997f61fe5b49eadee0bb51bdee
Reviewed-on: https://go-review.googlesource.com/c/go/+/232798
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Trust: Damien Neil <dneil@google.com>
modload.Init now sets the default value for -mod if it wasn't set
explicitly. This happens before go.mod is loaded, so
modload.LoadModFile sets the default value again in order to enable
automatic vendoring.
Previously, cfg.BuildMod wasn't set at all if LoadModFile wasn't
called, as is the case for commands that run outside of a module
root. This problem only affected 'go install pkg@version' since other
commands are either forbidden in module mode or run with -mod=mod
(like 'go get' and 'go mod' subcommands).
This change also suppresses "missing sum" errors when -mod=readonly is
enabled and there is no module root.
Fixes#43278
Related #40278
Change-Id: I6071cc42bc5e24d0d7e84556e5bfd8e368e0019d
Reviewed-on: https://go-review.googlesource.com/c/go/+/279490
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
tracebackothers is called from fatal throw/panic.
A fatal throw may be taken with allglock held (notably in the allocator
when allglock is held), which would cause a deadlock in tracebackothers
when we try to take allglock again. Locking allglock here is also often
a lock order violation w.r.t. the locks held when throw was called.
Avoid the deadlock and ordering issues by skipping locking altogether.
It is OK to miss concurrently created Gs (which are generally avoided by
freezetheworld(), and which were possible previously anyways if created
after the loop).
Fatal throw/panic freezetheworld(), which should freeze other threads
that may be racing to modify allgs. However, freezetheworld() does _not_
guarantee that it stops all other threads, so we can't simply drop the
lock.
Fixes#42669
Updates #43175
Change-Id: I657aec46ed35fd5d1b3f1ba25b500128ab26b088
Reviewed-on: https://go-review.googlesource.com/c/go/+/270861
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Pratt <mpratt@google.com>
It isn't necessary on darwin/arm64 (macOS).
It was probably leftover from the old code when darwin/arm64
meant iOS. The test passes on iOS builder. Apparently this is
not needed either. Remove.
Change-Id: I6fa0c55d6086325d4b722862c4fe6c30bcd6e6e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/280158
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
When time.Parse sees a timezone name that matches the local timezone,
it uses the local timezone. The tests weren't expecting that,
so using MDT broke with TZ=America/Boise (where MDT means Mountain
Daylight Time). Just use GMT instead.
Fixes#43354
Change-Id: Ida70c8c867e2568b1535d1dfbf1fb0ed9e0e5c1e
Reviewed-on: https://go-review.googlesource.com/c/go/+/280072
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Today, timeHistogram, when copied, has the wrong set of counts for the
bucket that should represent (-inf, 0), when in fact it contains [0, 1).
In essence, the buckets are all shifted over by one from where they're
supposed to be.
But this also means that the existence of the overflow bucket is wrong:
the top bucket is supposed to extend to infinity, and what we're really
missing is an underflow bucket to represent the range (-inf, 0).
We could just always zero this bucket and continue ignoring negative
durations, but that likely isn't prudent.
timeHistogram is intended to be used with differences in nanotime, but
depending on how a platform is implemented (or due to a bug in that
platform) it's possible to get a negative duration without having done
anything wrong. We should just be resilient to that and be able to
detect it.
So this change removes the overflow bucket and replaces it with an
underflow bucket, and timeHistogram no longer panics when faced with a
negative duration.
Fixes#43328.
Fixes#43329.
Change-Id: If336425d7d080fd37bf071e18746800e22d38108
Reviewed-on: https://go-review.googlesource.com/c/go/+/279468
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Currently these two metrics are reported incorrectly, going by the
documentation in the runtime/metrics package. We just copy in the
size-class-based values from the runtime wholesale, but those implicitly
have an inclusive upper-bound and exclusive lower-bound (e.g. 48-byte
size class contains objects in the size range (32, 48]) but the API
declares inclusive lower-bounds and exclusive upper-bounds.
Also, the bottom bucket representing (-inf, 1) should always be empty.
Extend the consistency check to verify this.
Updates #43329.
Change-Id: I11b5b062a34e13405ab662d15334bda91f779775
Reviewed-on: https://go-review.googlesource.com/c/go/+/279467
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Trust: Michael Knyszek <mknyszek@google.com>
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'go get pkg@vers' will now add an explicit requirement for the module
providing pkg if that version was already indirectly required.
'go get mod@vers' will do the same if mod is a module path but not a
package.
Requirements promoted this way will be marked "// indirect" because
'go get' doesn't know whether they're needed to build packages in the
main module. So users should prefer to run 'go get ./pkg' (where ./pkg
is a package in the main module) to promote requirements.
Fixes#43131
Change-Id: Ifbb65b71274b3cc752a7a593d6ddd875f7de23b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/278812
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The syscall.AllThreadsSyscall() fixup mechanism needs to cooperate
with signal handling to ensure a notetsleepg() thread can wake up
to run the mDoFixup() function.
Fixes#43149
Change-Id: I6651b25bc44a4de47d3fb71d0293d51aef8b79c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/277434
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Under linux+cgo, OS threads are launched via pthread_create().
This abstraction, under linux, requires we avoid blocking
signals 32,33 and 34 indefinitely because they are needed to
reliably execute POSIX-semantics threading in glibc and/or musl.
When blocking signals the go runtime generally re-enables them
quickly. However, when a thread exits (under cgo, this is
via a return from mstart()), we avoid a deadlock in C-code by
not blocking these three signals.
Fixes#42494
Change-Id: I02dfb2480a1f97d11679e0c4b132b51bddbe4c14
Reviewed-on: https://go-review.googlesource.com/c/go/+/269799
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
By default (and with -mod=readonly), the go command imports an error
if a package provided by an implicitly required module is
imported by a package in the main module. This import requires an
update to go.mod: the module must be required explicitly.
The package loader now provides a hint that 'go get' should be run on
the importing package. This is preferred to 'go get' on the imported
package, since that would add an "// indirect" requirement.
For #43131
Change-Id: I0b353ce8ac8c4ddf1a9863544dfaf6c1964daf42
Reviewed-on: https://go-review.googlesource.com/c/go/+/279528
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The Go PE linker does not support enough generalized PE logic to
properly handle .rsrc sections gracefully. Instead a few things are
special cased for these. The linker also does not support PE's "grouped
sections" features, in which input objects have several named sections
that are sorted, merged, and renamed in the output file. In the past,
more sophisticated support for resources or for PE features like grouped
sections have not been necessary, as Go's own object formats are pretty
vanilla, and GNU binutils also produces pretty vanilla objects where all
sections are already merged.
However, GNU binutils is lagging with arm support, and here LLVM has
picked up the slack. In particular, LLVM has its own rc/cvtres combo,
which are glued together in mingw LLVM distributions as windres, a
command line compatible tool with binutils' windres, which supports arm
and arm64. But there's a key difference between binutils' windres and
LLVM's windres: the LLVM one uses proper grouped sections.
So, this commit adds grouped sections support for resource sections to
the linker. We don't attempt to plumb generic support for grouped
sections, just as there isn't generic support already for what resources
require. Instead we augment the resource handling logic to deal with
standard two-section resource objects.
We also add a test for this, akin to the current test for more vanilla
binutils resource objects, and make sure that the rsrc tests are always
performed.
Fixes#42866.
Fixes#43182.
Change-Id: I059450021405cdf2ef1c195ddbab3960764ad711
Reviewed-on: https://go-review.googlesource.com/c/go/+/268337
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
In issue11656.go, it tests that if the runtime can get a
reasonable traceback when it faults at a non-function PC. It does
it by jumping to an address that contains an illegal or trap
instruction. When it traps, the SIGTRAP crashes the runtime.
This CL changes it to use an instruction that triggers SIGSEGV.
This is due to two reasons:
- currently, the handling of bad PC is done by preparePanic,
which is only used for a panicking signal (SIGSEGV, SIGBUS,
SIGFPE), not a fatal signal (e.g. SIGTRAP).
- the test uses defer+recover to get a traceback, which only
works for panicking signals, not fatal signals.
Ideally, we should handle all kinds of faults (SIGSEGV, SIGBUS,
SIGILL, SIGTRAP, etc.) with a nice traceback. I'll leave this
for the future.
This CL also adds RISCV64 support.
Fixes#43283.
Change-Id: I5e0fbf8530cc89d16e05c3257d282bc1d4d03405
Reviewed-on: https://go-review.googlesource.com/c/go/+/279423
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The FreeBSD syscall convention uses the carry flag to indicate whether
an error has occured. The sys_umtx_op, thr_new, and pipe2 syscall
wrappers were failing to account for this convention and silently
suppressing errors as a result. This commit corrects these wrappers
by copying the pattern used by the other fallible syscall wrappers.
Note that futexsleep1 must now explicitly ignore the ETIMEDOUT error
from sys_umtx_op. Previously ETIMEDOUT was implicitly ignored because
sys_umtx_op never returned an error.
Fixes#43106.
Change-Id: I9c422b87cf4c6d308003bf42c3b419f785578b5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/276892
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Than McIntosh <thanm@google.com>
Treat the compiler's -linkobj output as "compiler object, which
means "pack c" will "see through" the file and add individual
entry to the new archive, instead of the object as a whole.
This is somewhat peculiar. But Go 1.15's cmd/pack does this,
although seemingly accidental. We just do the same. FWIW, it
does make things more consistent with/without -linkobj flag.
Fixes#43271.
Change-Id: I6b2d99256db7ebf0fa430f85afa7464e334f6bcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/279483
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
On darwin, where we use libc for syscalls, when the runtime exits,
it calls libc exit function, which may call back into user code,
e.g. invoking functions registered with atexit. In particular, it
may call back into Go. But at this point, the Go runtime is
already exiting, so this wouldn't work.
On non-libc platforms we use exit syscall directly, which doesn't
invoke any callbacks. Use _exit on darwin to achieve the same
behavior.
No test for now, as it doesn't pass on all platforms (see trybot
run of PS2).
May fix#42465.
May fix#43294.
Change-Id: Ia1ada22b5da8cb64fdd598d0541eb90e195367eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/269378
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The netbsd kernel has a bug [1] that occassionally prevents netpoll from
waking with netpollBreak, which could result in missing timers for an
unbounded amount of time, as netpoll can't restart with a shorter delay
when an earlier timer is added.
Prior to CL 232298, sysmon could detect these overrun timers and
manually start an M to run them. With this fallback gone, the bug
actually prevents timer execution indefinitely.
As a workaround, we add back sysmon detection only for netbsd.
[1] https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=50094
Updates #42515
Change-Id: I8391f5b9dabef03dd1d94c50b3b4b3bd4f889e66
Reviewed-on: https://go-review.googlesource.com/c/go/+/277332
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Michael Pratt <mpratt@google.com>
This was part of a performance improvement made by CL 232298 to
reduce timer latency. On multiprocessor Plan 9 machines, it triggers
memory faults often enough that the builder test suite never completes
successfully. See issue #42303 for discussion. As shown by the benchmark
result below, worst case latency on plan9_arm is very bad even with the
wakep call in place - in the tickers-per-P=1 case, a 3ms timer is 270ms late.
Skipping the wakep call and running the benchmark again shows some cases
worse, some better. The performance cost doesn't seem excessive for this
temporary workaround which makes the plan9_arm builders usable again.
With wakep call:
cpu% go test -bench Latency time
goos: plan9
goarch: arm
pkg: time
BenchmarkParallelTimerLatency-4 100 10985859 avg-late-ns 18630963 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-4 195 270294688 avg-late-ns 542057670 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-4 234 182452000 avg-late-ns 423933688 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-4 280 193003004 avg-late-ns 408034405 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-4 282 132819086 avg-late-ns 313624570 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-4 339 71152187 avg-late-ns 189014519 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-4 315 26860484 avg-late-ns 101759844 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-4 357 19106739 avg-late-ns 59435620 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-4 376 7246933 avg-late-ns 38888461 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-4 267 40476892 avg-late-ns 205851926 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-4 294 87836303 avg-late-ns 252059695 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-4 379 4127144 avg-late-ns 10494927 max-late-ns
Without wakep call:
BenchmarkParallelTimerLatency-4 61 10775151 avg-late-ns 18668517 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-4 199 299587535 avg-late-ns 597182307 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-4 272 184561831 avg-late-ns 449739837 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-4 235 154983257 avg-late-ns 370940553 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-4 290 150034689 avg-late-ns 332399843 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-4 298 47540764 avg-late-ns 133709031 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-4 350 20379394 avg-late-ns 81742809 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-4 363 14403223 avg-late-ns 98901212 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-4 375 12293090 avg-late-ns 50266552 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-4 336 40628820 avg-late-ns 150946099 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-4 289 88265539 avg-late-ns 280770418 max-late-ns
BenchmarkStaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-4 375 8364937 avg-late-ns 22598421 max-late-ns
Fixes#42303
Change-Id: I70c63cb2a2bad46950a7cd9dfc7bb32943710d32
Reviewed-on: https://go-review.googlesource.com/c/go/+/275672
Reviewed-by: David du Colombier <0intro@gmail.com>
Trust: Michael Pratt <mpratt@google.com>
Previously, reassigned was failing to detect reassignments due to
channel receives in select statements (OSELRECV, OSELRECV2), or due to
standalone 2-value receive assignments (OAS2RECV). This was reported
as a devirtualization panic, but could have caused mis-inlining as
well.
Fixes#43292.
Change-Id: Ic8079c20c0587aeacff9596697fdeba80a697b12
Reviewed-on: https://go-review.googlesource.com/c/go/+/279352
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
The issue11656 code was using the trap instruction as a PC value,
but it is intended to call a PC value that contains the trap instruction.
It doesn't matter too much as in practice the address is not
executable anyhow. But may as well have the code act the way it
is documented to act.
Also, don't run the test with gccgo/GoLLVM, as it can't work.
The illegal instruction will have no unwind data, so the unwinder
won't be able to get past it. In other words, gccgo/GoLLVM suffer
from the exact problem that the issue describes, but it seems insoluble.
For golang/go#11656
Change-Id: Ib2e50ffc91d215fd50e78f742fafe476c92d704e
Reviewed-on: https://go-review.googlesource.com/c/go/+/278473
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The language spec only requires a signed binary exponent of 16 bits
for floating point constants. Permit a "exponent too large" error for
larger exponents.
Don't run test 11326b with gccgo, as it requires successful compilation
of floating point constants with exponents that don't fit in 16 bits.
Change-Id: I98688160c76864aba525a151a14aaaf86bc36a6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/279252
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
CL 243940 accidentally broke TestDependencies such that it always passed.
Make it work again, and add a test so that it won't break in the same way.
This revealed that the new embed package was missing from TestDepencies,
so add it.
Fixes#43249
Change-Id: I02b3e38dd35ad88880c4344d46de13b7639aa4c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/279073
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Historically the os package has not imported the strings package.
That was enforced by go/build.TestDependencies, but that test
was accidentally broken (#43249). A dependency of os on strings
was accidentally added by CL 266364; remove it.
For #42026
For #43249
Change-Id: If932308f30561fdcc5c608d7563e849c0d2870d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/279072
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Test failures started to happen sporadically on some builds after the introduction of NotifyContext.
To make these tests more robust and avoid the risk of crosstalk we run them in a separate process.
Fixes#41561.
Change-Id: Ia7af105c316afd11765358f1e5e253ccfe2adc2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/270198
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Cherry Zhang <cherryyz@google.com>
When doing external linking on Windows, auto-detect the linker flavor
(bfd vs gold vs lld) and when linking with "lld", avoid the use of
"-T" (linker script), since this option is not supported by lld.
[Note: the Go linker currently employs -T to ensure proper placement
of the .debug_gdb_scripts section, to work around issues in older
versions of binutils; LLD recognizes this section and does place it
properly].
Updates #39326.
Change-Id: I3ea79cdceef2316bf86eccdb60188ac3655264ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/278932
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Change the run.go driver to recognize the "gc" build tag.
Change existing tests to use the "gc" build tag if they use some
feature that seems specific to the gc compiler, such as passing specific
options to or expecting specific behavior from "go tool compile".
Change tests to use the "!gccgo" build tag if they use "go build" or
"go run", as while those might work with compilers other than gc, they
won't work with the way that gccgo runs its testsuite (which happens
independently of the go command).
For #43252
Change-Id: I666e04b6d7255a77dfc256ee304094e3a6bb15ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/279052
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This is a port of CL 278132 from the dev.typeparams branch. A notable
addition is a new error code, since no existing codes made sense and we
have an analogous code for type switches.
Fixes#43110
Change-Id: I22b3f9d8777063223f82785504e8b7d299bc5216
Reviewed-on: https://go-review.googlesource.com/c/go/+/278813
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Robert Findley <rfindley@google.com>
Mach-O relocation addend is signed 24-bit. When external linking,
if the addend is larger, we cannot put it directly into a Mach-O
relocation. This CL handles large addend by creating "label"
symbols at sym+0x800000, sym+(0x800000*2), etc., and emitting
Mach-O relocations that target the label symbols with a smaller
addend. The label symbols are generated late (similar to what
we do for RISC-V64).
One complexity comes from handling of carrier symbols, which does
not track its size or its inner symbols. But relocations can
target them. We track them in a side table (similar to what we
do for XCOFF, xcoffUpdateOuterSize).
Fixes#42738.
Change-Id: I8c53ab2397f8b88870d26f00e9026285e5ff5584
Reviewed-on: https://go-review.googlesource.com/c/go/+/278332
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
When testing if a flag (e.g. "-no-pie") is supported by the
external linker, pass arch-specific flags (like "-marm").
In particular, on the ARM builder, if CGO_LDFLAGS=-march=armv6
is set, the C toolchain fails to build if -marm is not passed.
# cc -march=armv6 1.c
1.c: In function 'main':
1.c:3:1: sorry, unimplemented: Thumb-1 hard-float VFP ABI
int main() {
^~~
This makes the Go linker think "-no-pie" is not supported when it
actually is.
Passing -marm makes it work.
Fixes#43202.
Change-Id: I4e8b71f08818993cbbcb2494b310c68d812d6b50
Reviewed-on: https://go-review.googlesource.com/c/go/+/278592
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The code in the new (introduced in 1.15) Go object file reader was
casting a pointer-mmaped-memory into a large array prior to performing
a read of the relocations section:
return (*[1<<20]Reloc)(unsafe.Pointer(&r.b[off]))[:n:n]
For very large object files, this artificial array isn't large enough
(that is, there are more than 1048576 relocs to read), so update the
code to use a larger artifical array size.
Fixes#41621.
Change-Id: Ic047c8aef4f8a3839f2e7e3594bce652ebd6bd5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/278492
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Trust: Than McIntosh <thanm@google.com>
The transponder sets up a deferred close on accepted connections which
is fine after the client reads all data. However there are no mutexes
nor channels to block the transponder from closing. If the scheduler
runs close before the client read, it will cause an EOF failure.
Fixes#42720
Change-Id: Ic21b476c5efc9265a80a2c6f8484efdb5af66405
Reviewed-on: https://go-review.googlesource.com/c/go/+/273672
Run-TryBot: Meng Zhuo <mzh@golangcn.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Meng Zhuo <mzh@golangcn.org>
Reviewed-by: Damien Neil <dneil@google.com>
Microsoft's linker looks at whether all input objects have an empty
section called @feat.00. If all of them do, then it enables SEH;
otherwise it doesn't enable that feature. So, since around the Windows
XP SP2 era, most tools that make PE objects just tack on that section,
so that it won't gimp Microsoft's linker logic. Go doesn't support SEH,
so in theory, none of this really matters to us. But actually, if the
linker tries to ingest an object with @feat.00 -- which are produced by
LLVM's resource compiler, for example -- it chokes because of the
IMAGE_SYM_ABSOLUTE section that it doesn't know how to deal with. Since
@feat.00 is just a marking anyway, skip IMAGE_SYM_ABSOLUTE sections that
are called @feat.00.
Change-Id: I1d7bfcf6001186c53e2c487c5ac251ca65efefee
Reviewed-on: https://go-review.googlesource.com/c/go/+/268239
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The gofrontend code sees that the denominator is not zero,
so it computes the values. Dividing zero by a non-zero value
produces zero. The language spec doesn't require any of these
cases to report an error, so make the errors compiler-specific.
Change-Id: I5ed759a3121e38b937744d32250adcbdf2c4d3c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/278117
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The bug429 tests is an exact duplicate of TestSimpleDeadlock in the
runtime package. The runtime package is the right place for this test,
and the version in the runtime package will run faster as the build
step is combined with other runtime package tests.
Change-Id: I6538d24e6df8e8c5e3e399d3ff37d68f3e52be56
Reviewed-on: https://go-review.googlesource.com/c/go/+/278173
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The language spec only requires that floating point values be
represented with 256 bits, which is about 1e75. The issue11371 test
was assuming that the compiler could represent 1e100. Adjusting the
test so that it only assumes 256 bits of precision still keeps the
test valid, and permits it to pass when using the gofrontend.
Change-Id: I9d1006e9adc9438277f4b8002488c912e5d61cc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/278116
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
With the gc compiler the import path implies the package path,
so keeping a canonical path is important. With the gofrontend
this is not the case, so we don't need to report this as a bug.
Change-Id: I245e34f9b66383bd17e79438d4b002a3e20aa994
Reviewed-on: https://go-review.googlesource.com/c/go/+/278115
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The pattern in NNN.dir directories is that if we have a.go,
the other files import "./a". For gc it happens to work to use a path,
but not for gofrontend. Better to be consistent.
Change-Id: I2e023cbf6bd115f9fb77427b097b0ff9b9992f17
Reviewed-on: https://go-review.googlesource.com/c/go/+/278113
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The path package doesn't have a Glob function. Adjust the release notes
re. CL 264397 accordingly.
Also add links to the documentation of all mentioned functions.
For #40700.
Change-Id: Ibf3e0530fa6fab36a3f6fbc664f0800869ce9ec7
Reviewed-on: https://go-review.googlesource.com/c/go/+/278213
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
fixedbugs/issue26416.go:24:16: error: unknown field ‘t1f1’ in ‘t2’
fixedbugs/issue26416.go:25:16: error: unknown field ‘t1f2’ in ‘t3’
fixedbugs/issue26416.go:26:16: error: unknown field ‘t2f1’ in ‘t3’
fixedbugs/issue26616.go:15:9: error: single variable set to multiple-value function call
fixedbugs/issue26616.go:9:5: error: incompatible type in initialization (multiple-value function call in single-value context)
fixedbugs/issue26616.go:12:13: error: incompatible type in initialization (multiple-value function call in single-value context)
fixedbugs/issue26616.go:13:13: error: incompatible type in initialization (multiple-value function call in single-value context)
fixedbugs/issue26616.go:15:9: error: incompatible type in initialization (multiple-value function call in single-value context)
fixedbugs/issue26616.go:14:11: error: incompatible types in assignment (multiple-value function call in single-value context)
fixedbugs/issue26855.go:23:12: error: incompatible type for field 1 in struct construction
fixedbugs/issue26855.go:27:12: error: incompatible type for field 1 in struct construction
fixedbugs/issue25958.go:14:18: error: expected ‘<-’ or ‘=’
fixedbugs/issue25958.go:15:35: error: expected ‘<-’ or ‘=’
fixedbugs/issue28079b.go:13:9: error: array bound is not constant
fixedbugs/issue28079b.go:16:22: error: invalid context-determined non-integer type for left operand of shift
fixedbugs/issue28079c.go:14:22: error: invalid context-determined non-integer type for left operand of shift
fixedbugs/issue28450.go:9:19: error: ‘...’ only permits one name
fixedbugs/issue28450.go:10:18: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:11:16: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:11:24: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:13:25: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:15:19: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:16:21: error: ‘...’ must be last parameter
fixedbugs/issue28450.go:16:31: error: ‘...’ must be last parameter
fixedbugs/issue28268.go:20:1: error: method ‘E’ redeclares struct field name
fixedbugs/issue28268.go:19:1: error: method ‘b’ redeclares struct field name
fixedbugs/issue27356.go:14:14: error: expected function
fixedbugs/issue27356.go:18:9: error: expected function
fixedbugs/issue29855.go:13:11: error: unknown field ‘Name’ in ‘T’
fixedbugs/issue27938.go:14:15: error: expected package
fixedbugs/issue27938.go:18:13: error: expected package
fixedbugs/issue27938.go:22:13: error: expected package
fixedbugs/issue27938.go:22:9: error: expected signature or type name
fixedbugs/issue29870b.go:13:9: error: ‘x’ declared but not used
fixedbugs/issue30085.go:10:18: error: wrong number of initializations
fixedbugs/issue30085.go:11:21: error: wrong number of initializations
fixedbugs/issue30087.go:10:18: error: wrong number of initializations
fixedbugs/issue30087.go:11:11: error: number of variables does not match number of values
fixedbugs/issue30087.go:12:9: error: wrong number of initializations
fixedbugs/issue30087.go:13:9: error: wrong number of initializations
fixedbugs/issue28926.go:16:14: error: use of undefined type ‘G’
fixedbugs/issue28926.go:18:14: error: use of undefined type ‘E’
fixedbugs/issue28926.go:22:24: error: use of undefined type ‘T’
fixedbugs/issue30722.go:13:13: error: invalid numeric literal
fixedbugs/issue30722.go:14:13: error: invalid numeric literal
fixedbugs/issue30722.go:15:13: error: invalid numeric literal
fixedbugs/issue33308.go:12:19: error: invalid context-determined non-integer type for left operand of shift
fixedbugs/issue33386.go:16:9: error: expected operand
fixedbugs/issue33386.go:22:9: error: expected operand
fixedbugs/issue33386.go:26:17: error: expected operand
fixedbugs/issue33386.go:27:18: error: expected operand
fixedbugs/issue33386.go:28:29: error: expected operand
fixedbugs/issue33386.go:15:17: error: reference to undefined name ‘send’
fixedbugs/issue33386.go:27:13: error: reference to undefined name ‘a’
fixedbugs/issue33386.go:21:19: error: value computed is not used
fixedbugs/issue33460.go:34:10: error: duplicate key in map literal
fixedbugs/issue33460.go:21:9: error: duplicate case in switch
fixedbugs/issue33460.go:24:9: error: duplicate case in switch
fixedbugs/issue33460.go:25:9: error: duplicate case in switch
fixedbugs/issue32723.go:12:14: error: invalid comparison of non-ordered type
fixedbugs/issue32723.go:13:13: error: invalid comparison of non-ordered type
fixedbugs/issue32723.go:16:16: error: invalid comparison of non-ordered type
fixedbugs/issue32723.go:17:16: error: invalid comparison of non-ordered type
fixedbugs/issue32723.go:18:15: error: invalid comparison of non-ordered type
fixedbugs/issue32723.go:21:15: error: invalid comparison of non-ordered type
fixedbugs/issue35291.go:13:9: error: duplicate value for index 1
fixedbugs/issue38745.go:12:12: error: reference to undefined field or method ‘M’
fixedbugs/issue38745.go:13:16: error: reference to undefined field or method ‘M’
fixedbugs/issue38745.go:17:19: error: reference to undefined field or method ‘M’
fixedbugs/issue38745.go:17:9: error: not enough arguments to return
fixedbugs/issue41500.go:16:22: error: incompatible types in binary expression
fixedbugs/issue41500.go:17:26: error: incompatible types in binary expression
fixedbugs/issue41500.go:18:22: error: incompatible types in binary expression
fixedbugs/issue41500.go:19:26: error: incompatible types in binary expression
fixedbugs/issue41575.go:23:6: error: invalid recursive type
fixedbugs/issue41575.go:9:6: error: invalid recursive type ‘T1’
fixedbugs/issue41575.go:13:6: error: invalid recursive type ‘T2’
fixedbugs/issue41575.go:17:6: error: invalid recursive type ‘a’
fixedbugs/issue41575.go:18:6: error: invalid recursive type ‘b’
fixedbugs/issue41575.go:19:6: error: invalid recursive type ‘c’
fixedbugs/issue41575.go:25:6: error: invalid recursive type ‘g’
fixedbugs/issue41575.go:32:6: error: invalid recursive type ‘x’
fixedbugs/issue41575.go:33:6: error: invalid recursive type ‘y’
fixedbugs/issue4215.go:10:9: error: not enough arguments to return
fixedbugs/issue4215.go:14:9: error: return with value in function with no return type
fixedbugs/issue4215.go:19:17: error: not enough arguments to return
fixedbugs/issue4215.go:21:9: error: not enough arguments to return
fixedbugs/issue4215.go:27:17: error: not enough arguments to return
fixedbugs/issue4215.go:29:17: error: too many values in return statement
fixedbugs/issue4215.go:31:17: error: not enough arguments to return
fixedbugs/issue4215.go:43:17: error: not enough arguments to return
fixedbugs/issue4215.go:46:17: error: not enough arguments to return
fixedbugs/issue4215.go:48:9: error: too many values in return statement
fixedbugs/issue4215.go:52:9: error: too many values in return statement
fixedbugs/issue41247.go:10:16: error: incompatible type for return value 1
fixedbugs/issue41440.go:13:9: error: too many arguments
fixedbugs/issue6772.go:10:16: error: ‘a’ repeated on left side of :=
fixedbugs/issue6772.go:17:16: error: ‘a’ repeated on left side of :=
fixedbugs/issue6402.go:12:16: error: incompatible type for return value 1
fixedbugs/issue6403.go:13:23: error: reference to undefined identifier ‘syscall.X’
fixedbugs/issue6403.go:14:15: error: reference to undefined name ‘voidpkg’
fixedbugs/issue7746.go:24:20: error: constant multiplication overflow
fixedbugs/issue7760.go:15:7: error: invalid constant type
fixedbugs/issue7760.go:16:7: error: invalid constant type
fixedbugs/issue7760.go:18:7: error: invalid constant type
fixedbugs/issue7760.go:19:7: error: invalid constant type
fixedbugs/issue7760.go:21:11: error: expression is not constant
fixedbugs/issue7760.go:22:11: error: expression is not constant
fixedbugs/issue7760.go:24:7: error: invalid constant type
fixedbugs/issue7760.go:25:7: error: invalid constant type
fixedbugs/issue7129.go:18:11: error: argument 1 has incompatible type (cannot use type bool as type int)
fixedbugs/issue7129.go:19:11: error: argument 1 has incompatible type (cannot use type bool as type int)
fixedbugs/issue7129.go:20:11: error: argument 1 has incompatible type (cannot use type bool as type int)
fixedbugs/issue7129.go:20:17: error: argument 2 has incompatible type (cannot use type bool as type int)
fixedbugs/issue7150.go:12:20: error: index expression is negative
fixedbugs/issue7150.go:13:13: error: some element keys in composite literal are out of range
fixedbugs/issue7150.go:14:13: error: some element keys in composite literal are out of range
fixedbugs/issue7150.go:15:13: error: some element keys in composite literal are out of range
fixedbugs/issue7150.go:16:13: error: some element keys in composite literal are out of range
fixedbugs/issue7675.go:16:11: error: argument 1 has incompatible type (cannot use type int as type string)
fixedbugs/issue7675.go:16:24: error: argument 3 has incompatible type (cannot use type string as type float64)
fixedbugs/issue7675.go:16:9: error: not enough arguments
fixedbugs/issue7675.go:16:14: error: floating-point constant truncated to integer
fixedbugs/issue7675.go:18:11: error: argument 1 has incompatible type (cannot use type int as type string)
fixedbugs/issue7675.go:18:24: error: argument 3 has incompatible type (cannot use type string as type float64)
fixedbugs/issue7675.go:18:28: error: argument 4 has incompatible type (cannot use type int as type string)
fixedbugs/issue7675.go:18:9: error: too many arguments
fixedbugs/issue7675.go:18:14: error: floating-point constant truncated to integer
fixedbugs/issue7675.go:19:11: error: argument 1 has incompatible type (cannot use type int as type string)
fixedbugs/issue7675.go:19:9: error: not enough arguments
fixedbugs/issue7675.go:19:14: error: floating-point constant truncated to integer
fixedbugs/issue7675.go:21:11: error: argument 1 has incompatible type (cannot use type int as type string)
fixedbugs/issue7675.go:21:19: error: argument 3 has incompatible type
fixedbugs/issue7675.go:21:14: error: floating-point constant truncated to integer
fixedbugs/issue7675.go:23:14: error: floating-point constant truncated to integer
fixedbugs/issue7153.go:11:15: error: reference to undefined name ‘a’
fixedbugs/issue7153.go:11:18: error: incompatible type for element 1 in composite literal
fixedbugs/issue7153.go:11:24: error: incompatible type for element 2 in composite literal
fixedbugs/issue7310.go:12:13: error: left argument must be a slice
fixedbugs/issue7310.go:13:13: error: second argument must be slice or string
fixedbugs/issue7310.go:14:15: error: incompatible types in binary expression
fixedbugs/issue6964.go:10:13: error: invalid type conversion (cannot use type complex128 as type string)
fixedbugs/issue7538a.go:14:9: error: reference to undefined label ‘_’
fixedbugs/issue8311.go:14:9: error: increment or decrement of non-numeric type
fixedbugs/issue8507.go:12:6: error: invalid recursive type ‘T’
fixedbugs/issue9521.go:16:20: error: argument 2 has incompatible type
fixedbugs/issue9521.go:17:20: error: argument 2 has incompatible type (cannot use type float64 as type int)
fixedbugs/issue8385.go:30:19: error: argument 1 has incompatible type (type has no methods)
fixedbugs/issue8385.go:30:14: error: not enough arguments
fixedbugs/issue8385.go:35:9: error: not enough arguments
fixedbugs/issue8385.go:36:9: error: not enough arguments
fixedbugs/issue8385.go:37:10: error: not enough arguments
fixedbugs/issue8385.go:38:10: error: not enough arguments
fixedbugs/issue8385.go:39:10: error: not enough arguments
fixedbugs/issue8385.go:40:10: error: not enough arguments
fixedbugs/issue8385.go:41:13: error: not enough arguments
fixedbugs/issue8438.go:13:23: error: incompatible type for element 1 in composite literal
fixedbugs/issue8438.go:14:22: error: incompatible type for element 1 in composite literal
fixedbugs/issue8438.go:15:23: error: incompatible type for element 1 in composite literal
fixedbugs/issue8440.go:10:9: error: reference to undefined name ‘n’
Change-Id: I5707aec7d3c9178c4f4d794d4827fc907b52efb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/278032
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
As far as I can tell, the addend is the same for both of these, and in
this context we don't really care about setting or unsetting the thumb
selection bit, so just treat these the same way.
Change-Id: I3756c027239f77778c32b317733df9ac92272580
Reviewed-on: https://go-review.googlesource.com/c/go/+/268238
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The linker recognizes headers for 386 and amd64 PE objects, but not arm
objects. This is easily overlooked, since its the same as the 386 header
value, except the two nibbles of the first word are swapped. This commit
simply adds the check for this. Without it, .syso objects are rejected,
which means Windows binaries can't have resources built into them. At
the same time, we add comments to better indicate which condition
applies to which arch.
Change-Id: I210411d978504c1a9540e23abc5a180e24f159ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/268237
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The `external_cgo_thread` test in `runtime/race/output_test.go` was
producing intermittent failures. The test was performing a sleep,
which may not be enough depending on how long it takes to setup the
callBack goroutine.
Added a synchronization to make sure callBack finishes before main ends.
Whether the increment to racy++ happens first in the callBack
or in main doesn't matter: the race detector should flag the race
regardless. The output check was changed so that the test passes
regardless of which increment occurs first.
Fixes#43008
Change-Id: I325ec3dea52b3725e739fbf2bd7ae92875d2de10
Reviewed-on: https://go-review.googlesource.com/c/go/+/276752
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
In an executable, the debug_addr and debug_rnglists sections are
assembled by concatenating the input sections, and each input section
has a header, and each header may have different attributes. So just
parsing the single header isn't right. Parsing the header is not
necessary to handle offsets into these sections which is all we do.
Looking at the header is also problematic because GCC with
-gsplit-dwarf when using DWARF versions 2 through 4 emits a
.debug_addr section, but it has no header. The header was only added
for DWARF 5. So we can't parse the header at all for that case, and we
can't even detect that case in general.
This CL also fixes SeekPC with addrx and strx formats, by not using
the wrong compilation unit to find the address or string base.
To make that work when parsing the compilation unit itself, we add
support for delay the resolution of those values until we know the base.
New test binaries built with
gcc -gdwarf-5 -no-pie debug/dwarf/testdata/line[12].c
(gcc (Debian 10.2.0-15) 10.2.0)
clang -gdwarf-5 -no-pie debug/dwarf/testdata/line[12].c
(clang version 9.0.1-14)
Change-Id: I66783e0eded629bf80c467767f781164d344a54d
Reviewed-on: https://go-review.googlesource.com/c/go/+/277233
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
fixedbugs/issue20602.go:13:9: error: argument must have complex type
fixedbugs/issue20602.go:14:9: error: argument must have complex type
fixedbugs/issue19323.go:12:12: error: attempt to slice object that is not array, slice, or string
fixedbugs/issue19323.go:18:13: error: attempt to slice object that is not array, slice, or string
fixedbugs/issue20749.go:12:11: error: array index out of bounds
fixedbugs/issue20749.go:15:11: error: array index out of bounds
fixedbugs/issue20415.go:14:5: error: redefinition of ‘f’
fixedbugs/issue20415.go:12:5: note: previous definition of ‘f’ was here
fixedbugs/issue20415.go:25:5: error: redefinition of ‘g’
fixedbugs/issue20415.go:20:5: note: previous definition of ‘g’ was here
fixedbugs/issue20415.go:33:5: error: redefinition of ‘h’
fixedbugs/issue20415.go:31:5: note: previous definition of ‘h’ was here
fixedbugs/issue19977.go:12:21: error: reference to undefined name ‘a’
fixedbugs/issue20812.go:10:13: error: invalid type conversion (cannot use type string as type int)
fixedbugs/issue20812.go:11:13: error: invalid type conversion (cannot use type int as type bool)
fixedbugs/issue20812.go:12:13: error: invalid type conversion (cannot use type string as type bool)
fixedbugs/issue20812.go:13:13: error: invalid type conversion (cannot use type bool as type int)
fixedbugs/issue20812.go:14:13: error: invalid type conversion (cannot use type bool as type string)
fixedbugs/issue21256.go:9:5: error: redefinition of ‘main’
fixedbugs/issue20813.go:10:11: error: invalid left hand side of assignment
fixedbugs/issue20185.go:22:16: error: ‘t’ declared but not used
fixedbugs/issue20185.go:13:9: error: cannot type switch on non-interface value
fixedbugs/issue20185.go:22:9: error: cannot type switch on non-interface value
fixedbugs/issue20227.go:11:11: error: division by zero
fixedbugs/issue20227.go:12:12: error: division by zero
fixedbugs/issue20227.go:13:12: error: division by zero
fixedbugs/issue20227.go:15:11: error: division by zero
fixedbugs/issue20227.go:16:12: error: division by zero
fixedbugs/issue19880.go:14:13: error: invalid use of type
fixedbugs/issue23093.go:9:5: error: initialization expression for ‘f’ depends upon itself
fixedbugs/issue21979.go:29:13: error: integer constant overflow
fixedbugs/issue21979.go:39:13: error: complex constant truncated to floating-point
fixedbugs/issue21979.go:10:13: error: invalid type conversion (cannot use type string as type bool)
fixedbugs/issue21979.go:11:13: error: invalid type conversion (cannot use type int as type bool)
fixedbugs/issue21979.go:12:13: error: invalid type conversion (cannot use type float64 as type bool)
fixedbugs/issue21979.go:13:13: error: invalid type conversion (cannot use type complex128 as type bool)
fixedbugs/issue21979.go:15:13: error: invalid type conversion (cannot use type bool as type string)
fixedbugs/issue21979.go:17:13: error: invalid type conversion (cannot use type float64 as type string)
fixedbugs/issue21979.go:18:13: error: invalid type conversion (cannot use type complex128 as type string)
fixedbugs/issue21979.go:20:13: error: invalid type conversion (cannot use type string as type int)
fixedbugs/issue21979.go:21:13: error: invalid type conversion (cannot use type bool as type int)
fixedbugs/issue21979.go:27:13: error: invalid type conversion (cannot use type string as type uint)
fixedbugs/issue21979.go:28:13: error: invalid type conversion (cannot use type bool as type uint)
fixedbugs/issue21979.go:34:13: error: invalid type conversion (cannot use type string as type float64)
fixedbugs/issue21979.go:35:13: error: invalid type conversion (cannot use type bool as type float64)
fixedbugs/issue21979.go:41:13: error: invalid type conversion (cannot use type string as type complex128)
fixedbugs/issue21979.go:42:13: error: invalid type conversion (cannot use type bool as type complex128)
fixedbugs/issue21988.go:11:11: error: reference to undefined name ‘Wrong’
fixedbugs/issue22063.go:11:11: error: reference to undefined name ‘Wrong’
fixedbugs/issue22904.go:12:6: error: invalid recursive type ‘a’
fixedbugs/issue22904.go:13:6: error: invalid recursive type ‘b’
fixedbugs/issue22921.go:11:16: error: reference to undefined identifier ‘bytes.nonexist’
fixedbugs/issue22921.go:13:19: error: reference to undefined identifier ‘bytes.nonexist’
fixedbugs/issue22921.go:13:19: error: expected signature or type name
fixedbugs/issue22921.go:17:15: error: reference to undefined identifier ‘bytes.buffer’
fixedbugs/issue23823.go:15:9: error: invalid recursive interface
fixedbugs/issue23823.go:10:9: error: invalid recursive interface
fixedbugs/issue23732.go:24:13: error: too few expressions for struct
fixedbugs/issue23732.go:34:17: error: too many expressions for struct
fixedbugs/issue23732.go:37:13: error: too few expressions for struct
fixedbugs/issue23732.go:40:17: error: too many expressions for struct
fixedbugs/issue22794.go:16:14: error: reference to undefined field or method ‘floats’
fixedbugs/issue22794.go:18:19: error: unknown field ‘floats’ in ‘it’
fixedbugs/issue22794.go:19:17: error: unknown field ‘InneR’ in ‘it’
fixedbugs/issue22794.go:18:9: error: ‘i2’ declared but not used
fixedbugs/issue22822.go:15:17: error: expected function
fixedbugs/issue25727.go:12:10: error: reference to unexported field or method ‘doneChan’
fixedbugs/issue25727.go:13:10: error: reference to undefined field or method ‘DoneChan’
fixedbugs/issue25727.go:14:21: error: unknown field ‘tlsConfig’ in ‘http.Server’
fixedbugs/issue25727.go:15:21: error: unknown field ‘DoneChan’ in ‘http.Server’
fixedbugs/issue25727.go:21:14: error: unknown field ‘bAr’ in ‘foo’
Change-Id: I32ce0b7d80017b2367b8fb479a881632240d4161
Reviewed-on: https://go-review.googlesource.com/c/go/+/277455
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
fixedbugs/issue14136.go:17:16: error: unknown field ‘X’ in ‘T’
fixedbugs/issue14136.go:18:13: error: incompatible type in initialization (cannot use type int as type string)
fixedbugs/issue14520.go:9:37: error: import path contains control character
fixedbugs/issue14520.go:14:2: error: expected ‘)’
fixedbugs/issue14520.go:14:3: error: expected declaration
fixedbugs/issue14652.go:9:7: error: use of undefined type ‘any’
fixedbugs/issue14729.go:13:17: error: embedded type may not be a pointer
fixedbugs/issue15514.dir/c.go:10: error: incompatible type in initialization
fixedbugs/issue15898.go:11:9: error: duplicate type in switch
fixedbugs/issue15898.go:16:9: error: duplicate type in switch
fixedbugs/issue16439.go:10:21: error: index expression is negative
fixedbugs/issue16439.go:13:21: error: index expression is negative
fixedbugs/issue16439.go:16:21: error: index expression is not integer constant
fixedbugs/issue16439.go:18:22: error: index expression is not integer constant
fixedbugs/issue17328.go:11:20: error: expected ‘{’
fixedbugs/issue17328.go:11:20: error: expected ‘;’ or ‘}’ or newline
fixedbugs/issue17328.go:13:1: error: expected declaration
fixedbugs/issue17588.go:14:15: error: expected type
fixedbugs/issue17631.go:20:17: error: unknown field ‘updates’ in ‘unnamed struct’
fixedbugs/issue17645.go:15:13: error: incompatible type in initialization
fixedbugs/issue17758.go:13:1: error: redefinition of ‘foo’
fixedbugs/issue17758.go:9:1: note: previous definition of ‘foo’ was here
fixedbugs/issue18092.go:13:19: error: expected colon
fixedbugs/issue18231.go:17:12: error: may only omit types within composite literals of slice, array, or map type
fixedbugs/issue18393.go:24:38: error: expected type
fixedbugs/issue18419.dir/test.go:12: error: reference to unexported field or method 'member'
fixedbugs/issue18655.go:14:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:15:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:16:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:17:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:18:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:20:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:21:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18655.go:22:1: error: redefinition of ‘m’
fixedbugs/issue18655.go:13:1: note: previous definition of ‘m’ was here
fixedbugs/issue18915.go:13:20: error: expected ‘;’ after statement in if expression
fixedbugs/issue18915.go:16:21: error: parse error in for statement
fixedbugs/issue18915.go:19:24: error: expected ‘;’ after statement in switch expression
fixedbugs/issue18915.go:13:12: error: ‘a’ declared but not used
fixedbugs/issue18915.go:16:13: error: ‘b’ declared but not used
fixedbugs/issue18915.go:19:16: error: ‘c’ declared but not used
fixedbugs/issue19012.go:16:17: error: return with value in function with no return type
fixedbugs/issue19012.go:18:9: error: return with value in function with no return type
fixedbugs/issue19012.go:22:16: error: argument 2 has incompatible type (cannot use type bool as type uint)
fixedbugs/issue19012.go:22:9: error: too many arguments
fixedbugs/issue19012.go:22:16: error: incompatible types in binary expression
fixedbugs/issue19012.go:24:9: error: too many arguments
fixedbugs/issue19056.go:9:9: error: expected operand
fixedbugs/issue19056.go:9:9: error: expected ‘;’ or newline after top level declaration
fixedbugs/issue19482.go:25:15: error: expected struct field name
fixedbugs/issue19482.go:27:15: error: expected struct field name
fixedbugs/issue19482.go:31:19: error: expected struct field name
fixedbugs/issue19482.go:33:15: error: expected struct field name
fixedbugs/issue19667.go:13:1: error: expected operand
fixedbugs/issue19667.go:13:1: error: missing ‘)’
fixedbugs/issue19667.go:13:105: error: expected ‘;’ after statement in if expression
fixedbugs/issue19667.go:13:105: error: expected ‘{’
fixedbugs/issue19667.go:12:19: error: reference to undefined name ‘http’
Change-Id: Ia9c75b9c78671f354f0a0623dbc075157ef8f181
Reviewed-on: https://go-review.googlesource.com/c/go/+/277433
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The type of the shift count must be an unsigned integer. Some s390x
rules for shift have their auxint type being int8. This results in a
compilation failure on s390x with an invalid operation when running
make.bash using older versions of go (e.g: go1.10.4).
This CL adds an auxint type of uint8 and changes the ops for shift and
rotate to use auxint with type uint8. The related rules are also
modified to address this change.
Fixes#43090
Change-Id: I594274b6e3d9b23092fc9e9f4b354870164f2f19
Reviewed-on: https://go-review.googlesource.com/c/go/+/277078
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
If 'go install' is invoked in module mode outside a module with a
package that could only be loaded from a module, it will now suggest
running 'go install pkg@latest'.
'go install' will still work outside a module on packages in std and
cmd, as well as .go files specified on the command line.
Fixes#42638
Change-Id: Ib0963935f028b7656178bc04a279b1114de35fbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/277355
Run-TryBot: Jay Conrod <jayconrod@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Replaced load.PackagesForBuild with a new function,
load.CheckPackageErrors. Callers should now call PackagesAndErrors,
then CheckPackageErrors for the same functionality.
Removed load.Packages. Callers should call base.Errorf and filter the
package list as needed.
This gives callers more flexibility in handling package load errors.
For #42638
Change-Id: Id75463ba695adc1ca3f8693ceb2c8978b74a3500
Reviewed-on: https://go-review.googlesource.com/c/go/+/277354
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Since CL 270057, there're many attempts to fix the expand_calls pass
with interface{}-typed. But all of them did not fix the root cause. The
main issue is during SSA conversion in gc/ssa.go, for empty interface
case, we make its type as n.Type, instead of BytePtr.
To fix these, we can just use BytePtr for now, since when itab fields
are treated as scalar.
No significal changes on compiler speed, size.
cmd/compile/internal/ssa
expandCalls.func6 9488 -> 9232 (-2.70%)
file before after Δ %
cmd/compile/internal/ssa.s 3992893 3992637 -256 -0.006%
total 20500447 20500191 -256 -0.001%
Fixes#43112
Updates #42784
Updates #42727
Updates #42568
Change-Id: I0b15d9434e0be5448453e61f98ef9c2d6cd93792
Reviewed-on: https://go-review.googlesource.com/c/go/+/276952
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The Go spec requires that select case clauses be evaluated in order,
which is stricter than normal ordering semantics. cmd/compile handled
this correctly for send clauses, but was not correctly handling
receive clauses that involved bare variable references.
Discovered with @cuonglm.
Fixes#43111.
Change-Id: Iec93b6514dd771875b084ba49c15d7f4531b4a6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/277132
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
The various conversion functions just change the format of time values.
They don't use the Unix epoch. Although in practice the values are often
times since the Unix epoch, they aren't always, so referring to the
epoch can be confusing.
Fixes#43010
Change-Id: I640d665f0d2017f0974db05d70858037c7c91eda
Reviewed-on: https://go-review.googlesource.com/c/go/+/277073
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
The tools section TODO can be removed since the tools section looks
complete by now.
All TODOs in the minor changes to the library section have been done,
so the top-level TODO is resolved. Delete it.
The currently highlighted entries under Core library section look
good. It's worth reviewing this further based on feedback from Go
1.16 pre-releases, so keep the TODO but make it non-user-visible
to unblock Go 1.16 Beta 1.
For #40700.
Change-Id: Ie72661bd457b0a93ef92e1bfc0844072f3b618a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/277212
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change adds an additional line explaining the ordering of the
supported metrics list. It's also necessary to ensure "Supported
metrics" is displayed by godoc as a proper header.
This modification does mean the description test, that ensures
descriptions line up with documentation, needs to change slightly
so it it doesn't read this new line as documentation. Make this
new line the line the test uses to decide when to begin.
Change-Id: I654c1c20e97a80ea79c8eb864445153ce91950bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/275852
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
fixedbugs/bug13343.go:10:12: error: initialization expressions for ‘b’ and ‘c’ depend upon each other
fixedbugs/bug13343.go:11:9: note: ‘c’ defined here
fixedbugs/bug13343.go:11:9: error: initialization expression for ‘c’ depends upon itself
fixedbugs/bug13343.go:11:9: error: initialization expressions for ‘c’ and ‘b’ depend upon each other
fixedbugs/bug13343.go:10:12: note: ‘b’ defined here
fixedbugs/issue10700.dir/test.go:24:10: error: reference to method ‘Do’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:25:10: error: reference to method ‘do’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:27:10: error: reference to method ‘Dont’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:28:13: error: reference to undefined field or method ‘Dont’
fixedbugs/issue10700.dir/test.go:31:10: error: reference to undefined field or method ‘do’
fixedbugs/issue10700.dir/test.go:33:13: error: reference to undefined field or method ‘do’
fixedbugs/issue10700.dir/test.go:34:10: error: reference to undefined field or method ‘Dont’
fixedbugs/issue10700.dir/test.go:35:13: error: reference to undefined field or method ‘Dont’
fixedbugs/issue10700.dir/test.go:37:10: error: reference to method ‘Do’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:38:10: error: reference to method ‘do’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:40:13: error: reference to undefined field or method ‘do’
fixedbugs/issue10700.dir/test.go:41:10: error: reference to method ‘Dont’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:42:13: error: reference to undefined field or method ‘Dont’
fixedbugs/issue10700.dir/test.go:43:10: error: reference to method ‘secret’ in type that is pointer to interface, not interface
fixedbugs/issue10700.dir/test.go:44:13: error: reference to unexported field or method ‘secret’
fixedbugs/issue10975.go:13:9: error: interface contains embedded non-interface
fixedbugs/issue11326.go:26:17: error: floating-point constant overflow
fixedbugs/issue11326.go:27:17: error: floating-point constant overflow
fixedbugs/issue11326.go:28:17: error: floating-point constant overflow
fixedbugs/issue11361.go:9:11: error: import file ‘fmt’ not found
fixedbugs/issue11361.go:11:11: error: reference to undefined name ‘fmt’
fixedbugs/issue11371.go:12:15: error: floating-point constant truncated to integer
fixedbugs/issue11371.go:13:15: error: integer constant overflow
fixedbugs/issue11371.go:17:15: error: floating-point constant truncated to integer
fixedbugs/issue11590.go:9:17: error: integer constant overflow
fixedbugs/issue11590.go:9:17: error: integer constant overflow
fixedbugs/issue11590.go:10:22: error: complex real part overflow
fixedbugs/issue11590.go:10:22: error: complex real part overflow
fixedbugs/issue11590.go:11:23: error: complex real part overflow
fixedbugs/issue11590.go:11:23: error: complex real part overflow
fixedbugs/issue11590.go:9:19: error: integer constant overflow
fixedbugs/issue11590.go:10:24: error: complex real part overflow
fixedbugs/issue11590.go:11:25: error: complex real part overflow
fixedbugs/issue11610.go:11:7: error: import path is empty
fixedbugs/issue11610.go:12:4: error: invalid character 0x3f in input file
fixedbugs/issue11610.go:14:1: error: expected identifier
fixedbugs/issue11610.go:14:1: error: expected type
fixedbugs/issue11614.go:14:9: error: interface contains embedded non-interface
fixedbugs/issue13248.go:13:1: error: expected operand
fixedbugs/issue13248.go:13:1: error: missing ‘)’
fixedbugs/issue13248.go:12:5: error: reference to undefined name ‘foo’
fixedbugs/issue13266.go:10:8: error: package name must be an identifier
fixedbugs/issue13266.go:10:8: error: expected ‘;’ or newline after package clause
fixedbugs/issue13266.go:10:8: error: expected declaration
fixedbugs/issue13273.go:50:18: error: expected ‘chan’
fixedbugs/issue13273.go:53:24: error: expected ‘chan’
fixedbugs/issue13274.go:11:58: error: expected ‘}’
fixedbugs/issue13365.go:14:19: error: index expression is negative
fixedbugs/issue13365.go:15:21: error: index expression is negative
fixedbugs/issue13365.go:16:22: error: index expression is negative
fixedbugs/issue13365.go:19:13: error: some element keys in composite literal are out of range
fixedbugs/issue13365.go:22:19: error: incompatible type for element 1 in composite literal
fixedbugs/issue13365.go:23:21: error: incompatible type for element 1 in composite literal
fixedbugs/issue13365.go:24:22: error: incompatible type for element 1 in composite literal
fixedbugs/issue13415.go:14:5: error: redefinition of ‘x’
fixedbugs/issue13415.go:14:5: note: previous definition of ‘x’ was here
fixedbugs/issue13415.go:14:5: error: ‘x’ declared but not used
fixedbugs/issue13471.go:12:25: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:13:25: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:14:25: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:15:24: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:16:23: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:18:26: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:19:26: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:20:26: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:21:25: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:22:24: error: floating-point constant truncated to integer
fixedbugs/issue13471.go:24:24: error: floating-point constant truncated to integer
fixedbugs/issue13821b.go:18:12: error: incompatible types in binary expression
fixedbugs/issue13821b.go:19:13: error: incompatible types in binary expression
fixedbugs/issue13821b.go:20:13: error: incompatible types in binary expression
fixedbugs/issue13821b.go:21:13: error: incompatible types in binary expression
fixedbugs/issue13821b.go:22:13: error: incompatible types in binary expression
fixedbugs/issue13821b.go:24:12: error: incompatible types in binary expression
fixedbugs/issue14006.go:24:18: error: expected ‘;’ or ‘}’ or newline
fixedbugs/issue14006.go:30:18: error: expected ‘;’ or ‘}’ or newline
fixedbugs/issue14006.go:37:22: error: expected ‘;’ or ‘}’ or newline
fixedbugs/issue14006.go:43:22: error: expected ‘;’ or ‘}’ or newline
fixedbugs/issue14006.go:59:17: note: previous definition of ‘labelname’ was here
fixedbugs/issue14006.go:64:17: error: label ‘labelname’ already defined
fixedbugs/issue14006.go:24:17: error: value computed is not used
fixedbugs/issue14006.go:30:17: error: value computed is not used
fixedbugs/issue14006.go:37:20: error: value computed is not used
fixedbugs/issue14006.go:43:20: error: value computed is not used
fixedbugs/issue14006.go:59:17: error: label ‘labelname’ defined and not used
fixedbugs/issue14010.go:13:14: error: invalid left hand side of assignment
fixedbugs/issue14010.go:14:14: error: invalid left hand side of assignment
fixedbugs/issue14010.go:14:9: error: invalid use of type
fixedbugs/issue14321.go:30:10: error: method ‘F’ is ambiguous in type ‘C’
fixedbugs/issue14321.go:31:10: error: ‘G’ is ambiguous via ‘A’ and ‘B’
fixedbugs/issue14321.go:33:10: error: type ‘C’ has no method ‘I’
fixedbugs/issue8183.go:12:14: error: integer constant overflow
fixedbugs/issue9036.go:21:12: error: invalid prefix for floating constant
fixedbugs/issue9036.go:22:12: error: invalid prefix for floating constant
fixedbugs/issue9076.go:14:5: error: incompatible type in initialization (cannot use type uintptr as type int32)
fixedbugs/issue9076.go:15:5: error: incompatible type in initialization (cannot use type uintptr as type int32)
For issue9083.go avoid an error about a variable that is set but not used.
fixedbugs/issue9370.go:105:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:106:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:107:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:108:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:109:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:110:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:112:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:113:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:114:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:115:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:116:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:117:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:119:13: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:119:18: error: cannot use ‘_’ as value
fixedbugs/issue9370.go:36:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:39:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:43:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:46:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:50:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:53:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:56:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:57:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:58:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:59:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:60:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:61:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:65:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:68:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:70:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:71:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:72:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:73:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:74:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:75:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:77:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:78:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:79:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:80:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:81:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:82:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:84:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:85:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:86:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:87:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:88:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:89:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:91:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:92:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:93:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:94:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:95:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:96:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:98:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:99:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:100:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:101:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:102:15: error: invalid operation (func can only be compared to nil)
fixedbugs/issue9370.go:103:15: error: invalid comparison of non-ordered type
fixedbugs/issue9370.go:121:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:122:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:123:15: error: incompatible types in binary expression
fixedbugs/issue9370.go:124:15: error: incompatible types in binary expression
Change-Id: I4089de4919112b08f5f2bbec20f84fcc7dbe3955
Reviewed-on: https://go-review.googlesource.com/c/go/+/276832
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Done with:
go get -d golang.org/x/net@latest
go mod tidy
go mod vendor
go generate -run bundle std
The cmd module was updated as well, but go mod tidy undoes the change
because the x/net module doesn't contribute any packages to cmd module.
cmd/internal/moddeps.TestDependencyVersionsConsistent is happy with it:
// It's ok if there are undetected differences in modules that do not
// provide imported packages: we will not have to pull in any backports of
// fixes to those modules anyway.
Fixes#31192.
Updates #42498.
Change-Id: If303c9a7aa2ce8c2553fcb1ced7fccc9e6652ad6
Reviewed-on: https://go-review.googlesource.com/c/go/+/277012
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
When the -linkshared build mode is in effect, the Go command passes
the "-linkshared" command line option to the compiler so as to insure
special handling for things like builtin functions (which may appear
in a shared library and not the main executable). This patch extends
this behavior to the assembler, since the assembler may also wind up
referencing builtins when emitting a stack-split prolog.
Fixes#43107.
Change-Id: I56eaded79789b083f3c3d800fb140353dee33ba9
Reviewed-on: https://go-review.googlesource.com/c/go/+/276932
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When external linking, in case that the external linker generates
a code signature with a different size (e.g. as it uses a
different identifier), truncate the file after rewriting the code
signature, to make sure that no bytes after the signature (which
will invalidate the signature).
Fixes#43105.
Change-Id: I732f949fedd6de42d9f3cf6d017f7ba3f4e59e7a
Reviewed-on: https://go-review.googlesource.com/c/go/+/276693
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
os.ReadDir is a replacement for ioutil.ReadDir that returns
a slice of fs.DirEntry instead of fs.FileInfo, meaning it is the
more efficient form.
This CL updates call sites throughout the Go source tree
wherever possible. As usual, code built using the Go 1.4
bootstrap toolchain is not included. There is also a use in
go/build that appears in the public API and can't be changed,
at least not without additional changes.
Fixes#42026.
Change-Id: Icfc9dd52c6045020f6830e22c72128499462d561
Reviewed-on: https://go-review.googlesource.com/c/go/+/266366
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)
Update the Go tree to use the preferred names.
As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.
ReadDir changes are in a separate CL, because they are not a
simple search and replace.
For #42026.
Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
go test sets the working directory to that of the package being tested,
so opening one of the package source files can be done in a simpler way.
This also allows the test to run in more environments, for example when
GOROOT_FINAL¹ is set.
Also remove the testenv.HasSrc-like check for Go source. The doc.go
file is a part of the package being built and tested, so it's expected
to be available. If it's important for this test to handle when a test
binary is built with go test -c and executed elsewhere without package
source files, something more than testenv.HasSrc would be needed.
¹ https://golang.org/cmd/go/#hdr-Environment_variablesFixes#43085.
Change-Id: Ie6ade395a8fc7beebdadbad6f4873800138dfc26
Reviewed-on: https://go-review.googlesource.com/c/go/+/276452
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Issue #41600 fixed the issue when a second request canceled a connection
while the first request was still in roundTrip.
This uncovered a second issue where a request was being canceled (in
roundtrip) but the connection was put back into the idle pool for a
subsequent request.
The fix is the similar except its now in readLoop instead of roundTrip.
A persistent connection is only added back if it successfully removed
the cancel function; otherwise we know the roundTrip has started
cancelRequest.
Fixes#42942
Change-Id: Ia56add20880ccd0c1ab812d380d8628e45f6f44c
Reviewed-on: https://go-review.googlesource.com/c/go/+/274973
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Damien Neil <dneil@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
This fixes the unexpected growth of stack in child process, which
is caused by stack checking code in runtime.sigfillset called from
runtime.sigset while clearing the signal handlers in child process.
The redundant stack checking code is generated due to missing
'//go:nosplit' directive that should be annotated for
runtime.sigfillset.
Fixes#43066
Updates #21314
Change-Id: I9483a962a4b0747074313991841e2440ee32198c
Reviewed-on: https://go-review.googlesource.com/c/go/+/276173
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This is a port of CL 275517 from the dev.typeparams branch, to fix the
positioning of error messages for invalid const init expressions that
are inherited.
Differences from CL 275517:
+ The inherited flag is added to the constDecl intermediate
representation.
+ The errpos override is made a positioner, the internal interface
used by go/types to capture error position and span. For const decls
errpos is just set to a singular point, but using positioner is
correct and causes span start and end positions to also be
overridden.
+ Test cases are updated to assert on just 'overflows', as the go/types
error message is, for example, "cannot use 255 + iota (untyped int
constant 256) as byte value in constant declaration (overflows)".
This is more verbose than the compiler's "constant 256 overflows
byte", but changing that is out of scope.
Fixes#42991
Change-Id: I0a71d2290f7fff5513f2a6e49b83e6f0f4da30e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/276172
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Position independent code expects that R25 (aka $t9) contains the address of the
called function. As such, use R25 when calling from sigfwd.
Change-Id: I66b2b9bfa1f1bb983c7385eb2eaa19d9cd87d9fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/275893
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The gofrontend code would in some circumstances incorrectly generate a
type descriptor for an alias type, causing the type to fail to be
equal to the unaliased type.
Change-Id: I47d33b0bfde3c72a9a186049539732bdd5a6a96e
Reviewed-on: https://go-review.googlesource.com/c/go/+/275632
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
According to [1], this function returns NULL when it errors, rather than
INVALID_HANDLE_VALUE, which other Win32 functions return. This was
pointed out in CL 273446 for the x/sys package, and this patch here
cleans it up for the syscall package and updates the vendored x/sys
package using the usual `go get/go mod vendor` dance. The function is
currently in use by crypto/x509/root_windows.go, which calls
CertOpenStore(CERT_STORE_PROV_MEMORY), which I assume can fail under OOM
or other weird conditions. Quick reversing indicates that [1] is
correct, as there's a `xor eax, eax` in the error paths of the function
just before jumping to the epilogue.
[1] https://docs.microsoft.com/en-us/windows/win32/api/wincrypt/nf-wincrypt-certopenstore#return-value
Change-Id: I77c0b0319c13313212f8710785252c494da56ed5
Reviewed-on: https://go-review.googlesource.com/c/go/+/273827
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Sub provides a convenient way to refer to a subdirectory
automatically in future operations, like Unix's chdir(2).
The CL also includes updates to fstest to check Sub implementations.
As part of updating fstest, I changed the meaning of TestFS's
expected list to introduce a special case: if you list no expected files,
that means the FS must be empty. In general it's OK not to list all
the expected files, but if you list none, that's almost certainly a
mistake - if your FS were broken and empty, you wouldn't find out.
Making no expected files mean "must be empty" makes the mistake
less likely - if your file system ever worked, then your test will keep
it working.
That change found a testing bug: embedtest was making exactly
that mistake.
Fixes#42322.
Change-Id: I63fd4aa866b30061a0e51ca9a1927e576d6ec41e
Reviewed-on: https://go-review.googlesource.com/c/go/+/274856
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
An address of offset(SP) may point to the callee args area, and
may be used to move things into/out of the args/results. If an
address like that is spilled and picked up by the GC, it may hold
an arg/result live in the callee, which may not actually be live
(e.g. a result not initialized at function entry). Make sure
they are rematerializeable, so they are always short-lived and
never picked up by the GC.
This CL changes 386, PPC64, and Wasm. On AMD64 we already have
the rule (line 2159). On other architectures, we already have
similar rules like
(OffPtr [off] ptr:(SP)) => (MOVDaddr [int32(off)] ptr)
to avoid this problem. (Probably me in the past had run into
this...)
Fixes#42944.
Change-Id: Id2ec73ac08f8df1829a9a7ceb8f749d67fe86d1e
Reviewed-on: https://go-review.googlesource.com/c/go/+/275174
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
timer.when must always be positive. addtimer and modtimer already check
that it is non-negative; we expand it to include zero. Also upgrade from
pinning bad values to throwing, as these values shouldn't be possible to
pass (except as below).
timeSleep may overflow timer.nextwhen. This would previously have been
pinned by resetForSleep, now we fix it manually.
runOneTimer may overflow timer.when when adding timer.period. Detect
this and pin to maxWhen.
addtimer is now too strict to allow TestOverflowRuntimeTimer to test an
overflowed timer. Such a timer should not be possible; to help guard
against accidental inclusion siftup / siftdown will check timers as it
goes. This has been replaced with tests for period and sleep overflows.
Change-Id: I17f9739e27ebcb20d87945c635050316fb8e9226
Reviewed-on: https://go-review.googlesource.com/c/go/+/274853
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
timer when == 0, in the context of timer0When and timerModifiedEarliest,
is a sentinel value meaning there are no timers on the heap.
TestCheckRuntimeTimerOverflow reaching into the runtime to set a timer
to when = 0 when it is otherwise not possible breaks this invariant.
After golang.org/cl/258303, we will no longer detect and run this timer,
thus blocking any other timers lower on the heap from running. This
manifests as random timers failing to fire in other tests.
The need to set this overflowed timer to when = 0 is gone with the old
timer proc implementation, so we can simply remove it.
Fixes#42424
Change-Id: Iea32100136ad8ec1bedfa77b1e7d9ed868812838
Reviewed-on: https://go-review.googlesource.com/c/go/+/274632
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
The s390x assembly for shlVU does a forward copy when the shift amount s
is 0. This causes corruption of the result z when z is aliased to the
input x.
This fix removes the s390x assembly for both shlVU and shrVU so the pure
go implementations will be used.
Test cases have been added to the existing TestShiftOverlap test to
cover shift values of 0, 1 and (_W - 1).
Fixes#42838
Change-Id: I75ca0e98f3acfaa6366a26355dcd9dd82499a48b
Reviewed-on: https://go-review.googlesource.com/c/go/+/274442
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Robert Griesemer <gri@golang.org>
All instructions in the FMA extension on x86 are VEX prefixed.
VEX prefixed instructions generally require OSXSAVE to be enabled.
The execution of FMA instructions emitted by the Go compiler on amd64
will generate an invalid opcode exception if OSXSAVE is not enabled.
Fixes#41022
Change-Id: I49881630e7195c804110a2bd81b5bec8cac31ba8
Reviewed-on: https://go-review.googlesource.com/c/go/+/274479
Trust: Martin Möhrmann <moehrmann@google.com>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
assign.go:59:28: error: ‘x’ repeated on left side of :=
assign.go:65:20: error: ‘a’ repeated on left side of :=
method2.go:36:11: error: reference to method ‘val’ in type that is pointer to interface, not interface
method2.go:37:11: error: reference to method ‘val’ in type that is pointer to interface, not interface
Change-Id: I8f385c75a82fae4eacf4618df8f9f65932826494
Reviewed-on: https://go-review.googlesource.com/c/go/+/274447
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Returning an error about integer overflow is needlessly pedantic.
The meaning of ReadForm(MaxInt64) is easily understood
(accept a lot of data) and can be implemented.
Fixes#40430.
Change-Id: I8a522033dd9a2f9ad31dd2ad82cf08d553736ab9
Reviewed-on: https://go-review.googlesource.com/c/go/+/275112
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently, for data moving, we generate an msanread of the source,
followed by an msanwrite of the destination. msanread checks
the source is initialized.
This has a problem: if the source is an aggregate type containing
alignment paddings, the padding bytes may not be thought as
initialized by MSAN. If we copy the aggregate type by value, if
it counts as a read, MSAN reports using uninitialized data. This
CL changes it to use __msan_memmove for data copying, which tells
MSAN to propagate initialized-ness but not check for it.
Caveat: technically __msan_memmove is not a public API of MSAN,
although the C compiler does generate direct calls to it.
Also, when instrumenting a load of a struct, split the
instrumentation to fields, instead of generating an msanread for
the whole struct. This skips padding bytes, which may not be
considered initialized in MSAN.
Fixes#42820.
Change-Id: Id861c8bbfd94cfcccefcc58eaf9e4eb43b4d85c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/270859
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
It turned out that "go get" was using the network to look up
https://github.com?go-get=1 while resolving github.com/google/go-cmp,
and that is not the fastest page to load.
Stop that lookup by adjusting the path prefixes in the vcs table.
It also turned out that "go get" was using the network to look up
https://rsc.io?go-get=1 while resolving https://rsc.io/nonexist.svn.
That's a bit more defensible maybe, since rsc.io is not a known VCS host.
But for tests we really want to avoid the network entirely, so this CL
adds a special case in repoRootFromVCSPaths that returns a hard error
for plain "rsc.io" instead of doing the web fetch.
To keep us honest in the future, I added two automatically-set env
variables TESTGONETWORK=panic and TESTGOVCS=panic.
These cause the go command to panic rather than make a network request
or invoke a VCS command.
go test -short cmd/go now passes with these checks.
This reduced the time spent in go test -short cmd/go on my
Google workstation from 154s to 30s. (Yay network firewalls.)
Change-Id: I49207fca7f901fa011765fb984dc9cec8b691f11
Reviewed-on: https://go-review.googlesource.com/c/go/+/274441
Trust: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Unbuffered channels passed into signal.Notify can be lost
as the docs for signal.Notify caution with:
Package signal will not block sending to c: the caller must ensure
that c has sufficient buffer space to keep up with the expected signal
rate. For a channel used for notification of just one signal value,
a buffer of size 1 is sufficient.
Found by a static analyzer from Orijtech, Inc. called "sigchanyzer", but
it'll be donated to the Go project soon.
Updates #9399.
Change-Id: Ia0690e447582da028694ed65ace7b97961997b84
Reviewed-on: https://go-review.googlesource.com/c/go/+/274332
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Now that filepath.WalkDir is available, it is more efficient
and should be used in place of filepath.Walk.
Update the tree to reflect best practices.
As usual, the code compiled with Go 1.4 during bootstrap is excluded.
(In this CL, that's only cmd/dist.)
For #42027.
Change-Id: Ib0f7b1e43e50b789052f9835a63ced701d8c411c
Reviewed-on: https://go-review.googlesource.com/c/go/+/267719
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Pseudo branch instructions BGT, BGTU, BLE, and BLEU implemented In
CL 226397 were translated inconsistently compared to other ones due
to the inversion of registers. For instance, while "BLT a, b" generates
"jump if a < b", "BLE a, b" generates "jump if b <= a."
This CL fixes the translation in the assembler and the tests.
Change-Id: Ia757be73e848734ca5b3a790e081f7c4f98c30f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/271911
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
The gofrontend code doesn't distinguish semicolon and newline,
and it doesn't have special treatment for EOF.
syntax/semi6.go:9:47: error: unexpected semicolon or newline in type declaration
syntax/semi6.go:11:62: error: unexpected semicolon or newline in type declaration
Change-Id: I9996b59a4fc78ad1935e779f354ddf75c0fb44e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/274692
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
As the code signature contains hashes of the entire file (except
the signature itself), rewriting buildid will invalidate the
signature. This CL makes it regenerate the signature when
rewriting the buildid. It only does it when the file already has
a code signature, with proper size (darwin/arm64 binaries
generated by the Go linker should have).
Updates #38485, #42684.
Change-Id: I082d9e5808b0ee6a35f9c362d7262aadd9113c81
Reviewed-on: https://go-review.googlesource.com/c/go/+/272257
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This CL lets the linker code-sign output binaries on
darwin/arm64, as the kernel requires binaries must be signed in
order to run.
This signature will likely be invalidated when we stamp the
buildid after linking. We still do it in the linker, for
- plain "go tool link" works.
- the linker generates the LC_CODE_SIGNATURE load command with
the right size and offset, so we don't need to update it when
stamping the buildid.
Updates #38485, #42684.
Change-Id: Ia306328906d73217221ba31093fe61a935a46122
Reviewed-on: https://go-review.googlesource.com/c/go/+/272256
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
These replacement rules assume that TST and TEQ set V. But TST and
TEQ do not set V. This is a problem because instructions like LT are
actually checking for N!=V. But with TST and TEQ not setting V, LT
doesn't do anything meaningful. It's possible to construct trivial
miscompilations from this, such as:
package main
var x = [4]int32{-0x7fffffff, 0x7fffffff, 2, 4}
func main() {
if x[0] > x[1] {
panic("fail 1")
}
if x[2]&x[3] < 0 {
panic("fail 2") // Fails here
}
}
That first comparison sets V, via the CMP that subtracts the values
causing the overflow. Then the second comparison operation thinks that
it uses the result of TST, when it actually uses the V from CMP.
Before this fix:
TST R0, R1
BLT loc_6C164
After this fix:
TST R0, R1
BMI loc_6C164
The BMI instruction checks the N flag, which TST sets. This commit
fixes the issue by using [LG][TE]noov instead of vanilla [LG][TE], and
also adds a test case for the direct issue.
Fixes#42876.
Change-Id: I13c62c88d18574247ad002b671b38d2d0b0fc6fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/274026
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The code signature contains hashes of the entire file (except the
signature itself), including the buildid. Therefore, the buildid
cannot depend on the signature. Otherwise updating buildid will
invalidate the signature, and vice versa. As we cannot change the
code-signing algorithm, we can only change buildid calculation.
This CL changes the buildid calculation to exclude the Mach-O
code signature. So updating code signature after stamping the
buildid will not invalidate the buildid.
Updates #38485, #42684.
Change-Id: I8a9e2e25ca9dc00d9556d13b81652f43bbf6a084
Reviewed-on: https://go-review.googlesource.com/c/go/+/272255
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
On macOS/ARM64, the kernel requires that binaries must have a
valid code signature to run. The C toolchain code-signs the
binary at link time. We do the same.
It is more subtle for Go because we stamp the buildid after
linking. As the signature contains hashes of the entire file
(except the signature itself), we must (re)generate the signature
after stamping the buildid.
This CL adds a new codesign package, which provides
functionality to generate the code signature. It is a separate
internal package so it can be used both in the linker and by the
go command. The next CLs will add code-signing to the linker and
the go command.
Updates #38485, #42684.
Change-Id: Id46801a6665beebaab0eb413ff2e64c5b9467059
Reviewed-on: https://go-review.googlesource.com/c/go/+/272254
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
It's difficult for module authors to provide installation instructions
that work in both Go 1.15 and 1.16. We'll wait until 1.17 to print a
deprecation warning for installing executables with 'go get'.
Fixes#42885
Change-Id: I835b447e83e760f48fd664e8a117749e0cb59f83
Reviewed-on: https://go-review.googlesource.com/c/go/+/274552
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
If one was using http.Transport with DisableKeepAlives and trying
to upgrade a connection against net/http's Server, the Server
would not allow a "Connection: Upgrade" header to be written
and instead override it to "Connection: Close" which would
break the handshake.
This change ensures net/http's Server does not override the
connection header for successful protocol switch responses.
Fixes#36381.
Change-Id: I882aad8539e6c87ff5f37c20e20b3a7fa1a30357
GitHub-Last-Rev: dc0de83201
GitHub-Pull-Request: golang/go#36382
Reviewed-on: https://go-review.googlesource.com/c/go/+/213277
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Added notes for:
* go test -c and -i flags used with unknown flags
* GO111MODULE=on by default
* GOVCS
* Dropped requirements on excluded versions
Removed TODOs for documentation on the retract directive and
'go install pkg@version'. These pages will be written after the beta.
Change-Id: Ic9877a62f908be177a6035a039b72e969e7b7f22
Reviewed-on: https://go-review.googlesource.com/c/go/+/274438
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Currently, in the non-DynlinkingGo case with external linking, we generate a
R_X86_64_GOTPCREL relocation for the imported symbol. This results in the
external linker turning this into a R_X86_64_GLOB_DAT relocation, rather
than a R_X86_64_JUMP_SLOT. Always generate R_X86_64_PLT32 for SDYNIMPORT
calls so that these calls work correctly.
Update #36435Fixes#42671
Change-Id: I8a28884b7853cb4135053ed817bedc919482f4ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/270377
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Apparently, the macOS ARM64 kernel has a bug where when a signal
arrives and the signal stack is not currently faulted in, it may
kill the program with a SIGILL. Work around it by mlock the
signal stacks.
Fixes#42774.
Change-Id: I99a4b3fdb6d8af1c945725ddc2c25568d81c510a
Reviewed-on: https://go-review.googlesource.com/c/go/+/273686
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This matches the error messages after CL 273890.
syntax/semi4.go:11:9: error: unexpected semicolon or newline, expecting ‘{’ after for clause
syntax/semi4.go:10:13: error: reference to undefined name ‘x’
syntax/semi4.go:12:17: error: reference to undefined name ‘z’
Change-Id: Ic88ff6e27d50bf70f5b2114383b84c42c0682f39
Reviewed-on: https://go-review.googlesource.com/c/go/+/273891
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
On illumos systems, libc can under some conditions make use of files
from /proc. In the case of this test, the creation of new threads was
(in the target thread) causing libc to open and close
"/proc/self/lwp/5/lwpname" to set the thread name, which raced with the
leaking descriptor check (see detailed analysis in #42431).
This change requests that the Go runtime use less threads in the child
process used to check for leaked descriptors, without just disabling the
test. After a thousand repeated trials, the test no longer fails on
illumos.
Fixes#42431.
Change-Id: Iefda26134fc91f7cb205754676e9845d9b7205cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/273966
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
This is blocking forward progress of the de-bitrotting work, and I don't
know off hand how to fix this. Seeing as its disabled on other
platforms, I suspect pprof might not be a very reliable feature, so just
allow for the tests to fail for now, until somebody more motivated comes
along to fix it.
Updates #42862.
Change-Id: Ibc5cd1d82d97b9c2f887d7f3565f2fa70207c8b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/273826
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
These changes match the following gofrontend error messages:
blank1.go:16:1: error: may not define methods on non-local type
chan/perm.go:28:9: error: expected channel
chan/perm.go:29:11: error: left operand of ‘<-’ must be channel
chan/perm.go:69:9: error: argument must be channel
complit1.go:25:16: error: attempt to slice object that is not array, slice, or string
complit1.go:26:16: error: attempt to slice object that is not array, slice, or string
complit1.go:27:17: error: attempt to slice object that is not array, slice, or string
complit1.go:49:41: error: may only omit types within composite literals of slice, array, or map type
complit1.go:50:14: error: expected struct, slice, array, or map type for composite literal
convlit.go:24:9: error: invalid type conversion (cannot use type unsafe.Pointer as type string)
convlit.go:25:9: error: invalid type conversion (cannot use type unsafe.Pointer as type float64)
convlit.go:26:9: error: invalid type conversion (cannot use type unsafe.Pointer as type int)
ddd1.go:63:9: error: invalid use of ‘...’ calling non-variadic function
fixedbugs/bug176.go:12:18: error: index expression is not integer constant
fixedbugs/bug332.go:17:10: error: use of undefined type ‘T’
fixedbugs/issue4232.go:22:16: error: integer constant overflow
fixedbugs/issue4232.go:33:16: error: integer constant overflow
fixedbugs/issue4232.go:44:25: error: integer constant overflow
fixedbugs/issue4232.go:55:16: error: integer constant overflow
fixedbugs/issue4458.go:19:14: error: type has no method ‘foo’
fixedbugs/issue5172.go:24:14: error: too many expressions for struct
init.go:17:9: error: reference to undefined name ‘runtime’
initializerr.go:26:29: error: duplicate value for index 1
interface/explicit.go:60:14: error: type assertion only valid for interface types
label.go:64:9: error: reference to undefined label ‘go2’
label1.go:18:97: error: continue statement not within for
label1.go:22:97: error: continue statement not within for
label1.go:106:89: error: continue statement not within for
label1.go:108:26: error: invalid continue label ‘on’
label1.go:111:118: error: break statement not within for or switch or select
label1.go:113:23: error: invalid break label ‘dance’
map1.go:64:9: error: not enough arguments
map1.go:65:9: error: not enough arguments
map1.go:67:9: error: argument 1 must be a map
method2.go:36:11: error: reference to undefined field or method ‘val’
method2.go:37:11: error: reference to undefined field or method ‘val’
method2.go:41:12: error: method requires pointer (use ‘(*T).g’)
syntax/chan1.go:13:19: error: send statement used as value; use select for non-blocking send
syntax/chan1.go:17:11: error: send statement used as value; use select for non-blocking send
Change-Id: I98047b60a376e3d2788836300f7fcac3f2c285cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/273527
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
If the linker thinks that it's in exe mode instead of pie mode, it
won't emit relocations when generating the pcln table, and we wind
up with crashes like this on windows/arm, where all binaries are
in fact relocated:
Building Go toolchain2 using go_bootstrap and Go toolchain1.
fatal error: minpc or maxpc invalid
runtime: panic before malloc heap initialized
This problem was already solved by darwin/arm64, so solve it the same
way here for windows/arm.
Fixes CL 228478.
Fixes#42786.
Change-Id: I6d1db6907c131183649fc263ccca06783188f344
Reviewed-on: https://go-review.googlesource.com/c/go/+/273566
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
This function's prototype includes a return value, so return a value.
Otherwise clang gets upset:
--- FAIL: TestDLLPreloadMitigation (1.40s)
syscall_windows_test.go:986: failed to build dll: exit status 1 - nojack.c:7:1: error: non-void function does not return a value [-Werror,-Wreturn-type]
}
^
1 error generated.
Fixes#42860.
Change-Id: I65b8eb9ccb502692c5b65bd34829f331cd86eef0
Reviewed-on: https://go-review.googlesource.com/c/go/+/273726
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
None of the other, older, doc comments use the '*Logger' form, and while
'Logger' and 'logger' are both used in the package doc comment, the
common term used with the intended meaning is 'standard logger', which
appears another eleven times in doc comments.
Change-Id: I089103198fc82390517615eb27bbe7ef77107d34
Reviewed-on: https://go-review.googlesource.com/c/go/+/273486
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Many of the standard library changes that were added before CL 272871
ended up in the "Core library" section. That section is meant for
major changes like new packages, and most of these aren't.
Consolidate all changes in the "Minor changes to the library" section
for now, so that it's easier to get a complete picture of changes for
each package, along with the remaining TODOs. Add a TODO to read them
over at the end and factor out items that are worth highlighting.
Apply minor other fixups to improve consistency.
For #40700.
Change-Id: I7dc2e7ebf2ea3385fce0c207bae4ce467998a717
Reviewed-on: https://go-review.googlesource.com/c/go/+/273267
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
CL 34641 changed the Go runtime to assume GOARM=7 support on Android.
This change completes that by assuming GOARM=7 in the toolchain, fixing
the gotcha of inexplicably slow performance on non-arm64 Android devices.
There is already code in cmd/dist to force GOARM to 7 on GOOS=android. However,
dist is most likely run with GOOS != android.
Change-Id: I5e2bf11c3ecd0f6c193229eaa8ddc570722799d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/272846
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Elias Naur <mail@eliasnaur.com>
When c.elemsize==0 we call raceacquire() and racerelease()
as opposed to calling racereleaseacquire()
The reason for this change is that, when elemsize==0, we don't
allocate a full buffer for the channel. Instead of individual
buffer entries, the race detector uses the c.buf as the only
buffer entry. This simplification prevents us following the
memory model's happens-before rules implemented in racereleaseacquire().
So, instead of calling racereleaseacquire(), we accumulate
happens-before information in the synchronization object associated
with c.buf.
The functionality in this change is implemented in a new function
called racenotify()
Fixes#42598
Change-Id: I75b92708633fdfde658dc52e06264e2171824e51
Reviewed-on: https://go-review.googlesource.com/c/go/+/271987
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Currently, gentraceback decides which frames to print or elide when
unwinding inlined frames using only the name of the outermost
function. If the outermost function should be elided, then inlined
functions will also be elided, even if they shouldn't be.
This happens in practice in at least one situation. As of CL 258938,
exported Go functions (and functions they call) can now be inlined
into the generated _cgoexp_HASH_FN function. The runtime elides
_cgoexp_HASH_FN from tracebacks because it doesn't contain a ".".
Because of this bug, it also elides anything that was inlined into it.
This CL fixes this by synthesizing a funcInfo for the inlined
functions to pass to showframe.
Fixes#42754.
Change-Id: Ie6c663a4a1ac7f0d4beb1aa60bc26fc8cddd0f9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/272131
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The additions were generated using golang.org/x/build/cmd/relnote
at CL 272907. It was modified to find previously-missed entries
by querying the Gerrit API in addition to the maintner corpus.
For #40700.
Updates #41849.
Change-Id: If575984fe40e0133ad5e8fc5411ea5063457250d
Reviewed-on: https://go-review.googlesource.com/c/go/+/272871
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
This aligns the naming with GOARCH using 386 as a build target for
this architecture and makes it more easily found when searching
for documentation related to the build target.
Change-Id: I393bb89dd2f71e568124107b13e1b288fbd0c76a
Reviewed-on: https://go-review.googlesource.com/c/go/+/271988
Trust: Martin Möhrmann <moehrmann@google.com>
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Because we're expecting for future functions to be unavailable, we
should add an Unwrap() function to the DLLError struct, so that people
can test for this situation easily via:
if errors.Is(err, syscall.ERROR_PROC_NOT_FOUND) { ... }
DLLError already was wrapping the underlying Errno error, but never got
the Go 1.13 helper method.
Fixesgolang/go#42584
Change-Id: I0f32a5146946b1b37a30897ba825a56faefc792c
Reviewed-on: https://go-review.googlesource.com/c/go/+/269761
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
The Reqs function returns an mvs.Reqs implemention for the global
build list. The API that it presents assumes that the build list is
globally consistent (problematic for #40775) and readily available
(problematic for #36460).
Fortunately, it is no longer used outside of the modload package.
We can instead use individual instances of the unexported mvsReqs
struct, making the dependency on the global build list more explicit.
For #36460
For #40775
Change-Id: I8674442f2a86416b0bf9c3395cb591c1e724c9d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/272129
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Move the declaration of the -overlay flag to base.AddModCommonFlags,
where other flags that are needed for go mod commands and for builds
are declared. The flag's already initialized in modload.Init so
there's no additional work needed to be done to support it in the go
mod commands.
For #39958
Change-Id: I70725d620cc69cb820f6ed923d626f4fe041b1c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/272126
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
ListModules was used to download .info files so that 'go list -m all'
would succeed later when offline. However, 'go list -m all' may
already fail when offline after 'go mod tidy', so it doesn't make
sense to add complexity to 'go get'.
Instead, remove the ListModules call and fix the test that
accidentally depended on it.
For #42723
Change-Id: I692597cf5ca15c23fa6fc9d2bac4b6e044299482
Reviewed-on: https://go-review.googlesource.com/c/go/+/271577
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
As of CL 271646, all external callers have been eliminated. Replace
the remaining internal caller with a direct reference to the buildList
variable and remove the exported function to prevent backsliding.
For #36460
Change-Id: Iea82df1e3e604ada602dda3e830c06d441eee2a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/271647
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The modload.EditBuildList call added in CL 270980 already ensures that
installMod does not require a newer version of itself, so the condition
that this loop is checking for is redundant.
(I had meant for this change to be included in CL 270980, but
apparently somehow reverted it prior to mailing.)
For #36460
Change-Id: I4dd746b927f7012d950187cac9c510cd6fec8fd9
Reviewed-on: https://go-review.googlesource.com/c/go/+/271646
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
With this change, constant literals (and results of constant
operations) that internally become infinities are represented
externally (to go/constant) as "unknown" values.
The language has no provisions to deal with infinite constants,
and producing unknown values allows the typechecker to report
errors and avoid invalid operations (such as multiplication of
zero with infinity).
Fixes#20583.
Change-Id: I12f36a17d262ff7957b0d3880241b5a8b2984777
Reviewed-on: https://go-review.googlesource.com/c/go/+/271706
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
At this point in installOutsideModule the build list is empty, so
Selected trivially returns "none" for all modules.
(This change could have been made in CL 266657, but it was a bit
simpler to update the QueryPattern call sites mechanically to ensure
that there would be no unintentional semantic drift.)
For #36460
Change-Id: I44fb73794985bfeebb1dde0c092313f319c2945a
Reviewed-on: https://go-review.googlesource.com/c/go/+/271419
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
The 'go install' command does not support the -gccgo flag.
(I'm not sure why, but it doesn't.)
gccgo also uses system-native assembly syntax instead of cmd/compile's
Plan 9 derivative. I've added an assembly file that seems to work on
Linux, but I haven't tested it on other platforms; if it fails on
other platforms, we can refine the test as needed.
Fixes#42688
Change-Id: I0693a6a9eb58975f20cdc4160ef5f9a948563c88
Reviewed-on: https://go-review.googlesource.com/c/go/+/270978
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
The printing of the ptr values can mean that two dump outputs can't easily be
compared for the identical structure, so adding the "-d=dumpptrs" option to make
printing of Node pointer values be an option.
Change-Id: I0e92b02f069e9de2e6fa036a7841645d13cdd7a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/271339
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This updates the callbacks implementation on windows/arm for the
changes made in CL 258938. At the time, that was left as a TODO.
At the same time, it also extends the previous support for only 4
arguments to also support additional arguments on the stack. This is
required for functions like SetWinEventHook, which take 7 arguments. It
does this by pushing r0-r3 onto the stack before the normal prologue,
and then pointing the args struct to that location.
This is derived from CL 270077 and CL 270078.
Updates #40724.
Fixes#42591.
Change-Id: Icc199e7f2c24205e41be4e00015283c7e2a9b797
Reviewed-on: https://go-review.googlesource.com/c/go/+/271178
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Austin Clements <austin@google.com>
For the last remaining call site (in cmd/go/internal/work, added for
the new 'go install pkg@version' codepath in CL 254365), use
EditBuildList instead.
SetBuildList assumes that the caller has enough information to produce
a complete, coherent build list. With lazy loading, producing a
complete, coherent build list is no longer quite so trivial.
In CL 263267, I rewrote the main caller of SetBuildList (the 'go get'
command), and in the process added a more targeted modload hook
(EditBuildList). That hook also suffices for 'go install pkg@version'.
The resulting error messages are perhaps not as smooth as they ought
to be, but if they are too awkward we should probably fix them for
'go get' too, and the commands can continue to share the edit hook.
For #36460
Updates #40276
Change-Id: I698a9dcd2efe6378a4d91f21362880aa8e50001b
Reviewed-on: https://go-review.googlesource.com/c/go/+/270980
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
modload.LoadedModules reveals more information than necessary about
whether modules have been loaded lazily. The 'vendor' subcommand
doesn't actually need that much information: it has all of the
information that it needs from prior calls to LoadPackages and
ModFile.
For #36460
Change-Id: If08733cca930b2b80616b037b63985ecfd6a320b
Reviewed-on: https://go-review.googlesource.com/c/go/+/270979
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The parser reports syntactic errors in constant literals.
The go/constant package produces an "unknown" value for
syntactically correct numeric constants that are too small
or too large. Check for the unknown value and report an
error rather than silently continuing.
Fixes#42695.
Change-Id: I414214559a285d67ed50184dc750f106960b5620
Reviewed-on: https://go-review.googlesource.com/c/go/+/271377
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
When inlining a function call expression, it's possible that the
function callee subexpression has side effects that need to be
preserved. This used to not be an issue, because inlining wouldn't
recognize these as inlinable anyway. But golang.org/cl/266199 extended
the inlining logic to recognize more cases, but did not notice that
the actual inlining code was discarding side effects.
Issue identified by danscales@.
Fixes#42703.
Change-Id: I95f8fc076b6ca4e9362e80ec26dad9d87a5bc44a
Reviewed-on: https://go-review.googlesource.com/c/go/+/271219
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Within the frontend, we generally don't guarantee uniqueness of
anonymous types. For example, each struct type literal gets
represented by its own types.Type instance.
However, the field tracking code was using the struct type as a map
key. This broke in golang.org/cl/256457, because that CL started
changing the inlined parameter variables from using the types.Type of
the declared parameter to that of the call site argument. These are
always identical types (e.g., types.Identical would report true), but
they can be different pointer values, causing the map lookup to fail.
The easiest fix is to simply get rid of the map and instead use
Node.Opt for tracking the types.Field. To mitigate against more latent
field tracking failures (e.g., if any other code were to start trying
to use Opt on ODOT/ODOTPTR fields), we store this field
unconditionally. I also expect having the types.Field will be useful
to other frontend code in the future.
Finally, to make it easier to test field tracking without having to
run make.bash with GOEXPERIMENT=fieldtrack, this commit adds a
-d=fieldtrack flag as an alternative way to enable field tracking
within the compiler. See also #42681.
Fixes#42686.
Change-Id: I6923d206d5e2cab1e6798cba36cae96c1eeaea55
Reviewed-on: https://go-review.googlesource.com/c/go/+/271217
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
RWMutex provides explicit acquire/release synchronization events to the
race detector to model the mutex. It disables sync events within the
methods to avoid e.g., the atomics from adding false synchronization
events, which could cause false negatives in the race detector.
Change-Id: I5126ce2efaab151811ac264864aab1fa025a4aaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/270865
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Michael Pratt <mpratt@google.com>
The child in TestPanicSystemstack prints "x\n" and then blocks on a
lock. Receiving those bytes only indicates that the child is _about to
block_. Since we don't have a way to know when it is fully blocked,
sleep a bit to give it time to block. This makes us less likely to lose
the race and signal before the child blocks, which will fail the test as
the stack trace cannot be read from a running G.
Fixes#33626
Change-Id: I8a27b1b114bf75e1e5bcb2a7a33aa69cdbc22f40
Reviewed-on: https://go-review.googlesource.com/c/go/+/268578
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
On FreeBSD >= 11 with a kernel built with COMPAT_FREEBSD11 but not
COMPAT_FREEBSD10, the pipe syscall is not available. Thus, tests using
runtime.pipe fail with ENOSYS. As suggested by Ian, fix this by calling
pipe2(0) in these tests and fall back to pipe() in case of ENOSYS.
Fixes#42659
Change-Id: Ifbb8008884b7901fe87830d162ad326122c5fab9
Reviewed-on: https://go-review.googlesource.com/c/go/+/270917
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Previously, 'go get' loaded retractions for every module in the build
list, which took a long time and usually wasn't helpful.
This rolls forward CL 269019, which was reverted in CL 270521. The new
revision adds a call to modload.ListModules at the end of 'go get' to
ensure .info files are cached for everything in the build list.
Fixes#42185
Change-Id: I684f66c5e674384d5a0176fbc8317e5530b8a915
Reviewed-on: https://go-review.googlesource.com/c/go/+/270858
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Immediately after a forward Seek, the offset we're writing to is
beyond len(buf)+len(heap):
|<--- buf --->|<--- heap --->|
^
off
If we do a copyHeap at this point, the new heapPos should not be
0:
|<---------- buf ----------->|<-heap->|
^
off
Recompute it.
For #42082.
Change-Id: Icb3e4e1c7bf7d1fd3d76a2e0d7dfcb319c661534
Reviewed-on: https://go-review.googlesource.com/c/go/+/270941
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The shift amount in SRAconst needs to be in the [0,31] range, so stop
MOVWing -1 to SRA in the Rsh lowering rules.
Also see CL 270117.
Passes
$ GOARCH=mips go build -toolexec 'toolstash -cmp' -a std
$ GOARCH=mipsle go build -toolexec 'toolstash -cmp' -a std
Updates #42587
Change-Id: Ib5eb99b82310e404cc2d6f0c619b21b8a15406ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/270558
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The existing code for map index expressions checked the
wrong variable (x rather than key) to see if the index
assignment was correct. Since x.mode was always valid in
that case, type-checking didn't follow the error exit in
case of an incorrect map index expression.
However, since we know the correct map element type
irrespective of the validity of the map key, the existing
code path is preferrable over exiting early via an error
because the map index expression returns a valid type which
then can be used for further type-checking.
Removed the unneeded 'if' statement and added a test case
producing the expected two errors (rather than only one if
we would "correct" the 'if' statement instead).
In summary, this commit adds a test but doesn't change the
behavior of type-checking of map index expressions.
Change-Id: I67845bfaa03600c9400f9a1462d7a68a66921ad4
Reviewed-on: https://go-review.googlesource.com/c/go/+/270658
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Repair the code that generates PC ranges for DWARF inlined routine
instances to insure that if II Y is a child of II X within the inline
tree, X's ranges include the ranges from Y. This is similar to what
we're already doing for DWARF scopes.
Updates #33188.
Change-Id: I9bb552777fcd1ae93dc01872707667ad092b1dd9
Reviewed-on: https://go-review.googlesource.com/c/go/+/248724
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Trust: Than McIntosh <thanm@google.com>
Some rules for PPC64 were checking for a case
where a shift followed by an 'and' of a mask could
be lowered, depending on the format of the mask. The
function to verify if the mask was valid for this purpose
was not checking if the mask was 0 which we don't want to
allow. This case can happen if previous optimizations
resulted in that mask value.
This fixes isPPC64ValidShiftMask to check for a mask of 0 and return
false.
This also adds a codegen testcase to verify it doesn't try to
match the rules in the future.
Fixes#42610
Change-Id: I565d94e88495f51321ab365d6388c01e791b4dbb
Reviewed-on: https://go-review.googlesource.com/c/go/+/270358
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
When linking internally on OpenBSD, dedup libraries treating versioned
and unversioned libraries as equivalents. Versioned libraries are preferred
and are retained over unversioned libraries.
This avoids the situation where the use of cgo results in a DT_NEEDED for a
versioned library (for example, libc.so.96.1), while a dynamic import
specifies an unversioned library (for example, libc.so). Without deduplication
this would result in two DT_NEEDED entries, causing a failure when ld.so
attempts to load the Go binrary.
Updates #36435Fixes#39257
Change-Id: I4a4942f259dece01d97bb51df9e13d67c9f94d34
Reviewed-on: https://go-review.googlesource.com/c/go/+/249978
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
A missed newline was added for one case in CL 162957, but
the parallel no-output case was missed.
Add the missed newline for the second case and update the test to
cover the full line for both cases.
Updates #30263
Change-Id: I02aa523290295a6d409cd68066b45c6990e6fb6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/258758
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
A typo caused the validation rule to check against -WL,-O... which is
not a regular flag because the L should be lowercase as in the other
rules. This caused valid linker flags to be rejected and people had to
work around this by filtering their default flags that include, e.g.,
-Wl,-O1 for a simple link optimization.
Fix the typo that wrongly rejected -Wl,-O... but allowed a non-existing
-WL,-O flag.
Change-Id: Ia3bf730f16f5ad98a39d7f17159de17b44075462
GitHub-Last-Rev: 2ec7f2a2b9
GitHub-Pull-Request: golang/go#42631
Reviewed-on: https://go-review.googlesource.com/c/go/+/270278
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
mips SRA/SLL/SRL shift amounts are used mod 32; this change aligns the
XXXconst rules to mask the shift amount by &31.
Passes
$ GOARCH=mips go build -toolexec 'toolstash -cmp' -a std
$ GOARCH=mipsle go build -toolexec 'toolstash -cmp' -a std
Fixes#42587
Change-Id: I6003ebd0bc500fba4cf6fb10254e1b557bf8c48f
Reviewed-on: https://go-review.googlesource.com/c/go/+/270117
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
In certain cases, the declkared type of an OpIData is interface{}.
This was not expected (since interface{} is a pair, right?) and
thus caused a crash. What is intended is that these be treated as
a byteptr, so do that instead (this is what happens in 1.15).
Fixes#42568.
Change-Id: Id7c9e5dc2cbb5d7c71c6748832491ea62b0b339f
Reviewed-on: https://go-review.googlesource.com/c/go/+/270057
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
CL 258938 changed the way C to Go calls work such that they now
construct a C struct on the C side for the arguments and space for the
results. Any pointers in the result space must be zeroed, so we just
zero the whole struct.
However, C makes it surprisingly hard to robustly zero any struct
type. We had used a "{0}" initializer, which works in the vast
majority of cases, but fails if the type is empty or effectively
empty.
This CL fixes this by changing how the cgo tool zero-initializes the
argument struct to be more robust.
Fixes#42495.
Change-Id: Id1749b9d751e59eb7a02a9d44fec0698a2bf63cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/269337
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In chansend() and chanrecv() of chan.go, the order of calls to
raceacquire() and racerelease() was swapped, which meant that the
code was not following the memory model "by the letter of the law."
Similar for bufrecv and bufsend in select.go
The memory model says:
- A send happens before the corresponding receive completes, and
- the kth receive on a channel with capacity C happens before the
k+C send on that channel completes.
The operative word here is "completes." For example, a sender obtains
happens-before information on completion of the send-operation, which
means, after the sender has deposited its message onto the channel.
Similarly for receives.
If the order of raceacquire() and racerelease() is incorrect, the race
detector may fail to report some race conditions.
The fix is minimal from the point of view of Go. The fix does, however,
rely on a new function added to TSan:
https://reviews.llvm.org/D76322
This commit only affects execution when race detection is enabled.
Added two tests into `runtime/race/output_test.go`:
- `chanmm` tests for the issue addressed by this patch
- `mutex` is a test for inverted semaphores, which must not be broken
by this (or any other) patch
Fixes#37355
Change-Id: I5e886879ead2bd456a4b7dd1d17253641b767f63
Reviewed-on: https://go-review.googlesource.com/c/go/+/220419
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
These ioctls take a pid_t (generally a C integer aka int32) and not an int64 - we
currently get away with this on little endian 64 bit platforms, since the bytes
fall into the correct place, however this breaks on big endian 64 bit platforms
(like openbsd/mips64).
Update #40995
Change-Id: I622a0543fd562d97f76a7376a84fd2641e6d6a24
Reviewed-on: https://go-review.googlesource.com/c/go/+/267605
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change moves the code in work.(*Builder).cgo that, when there is
an overlay, copies non-Go files to objdir into work.(*Builder).Build,
and creates an overlay structure mapping from the nominal file paths
into the copies in objdir. That's propagated through to
work.(*Builder).ccompile, which will use it to pass in the path to the
overlaid contents in objdir when calling the compiler.
This allows for overlays of C/C++/Fortran files.
For #39958
Change-Id: I9a2e3d3ba6afdf7ce19be1dbf4eee34805cdc05f
Reviewed-on: https://go-review.googlesource.com/c/go/+/266376
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
A hand-edited object file can have a symbol name that uses newline and
other normally invalid characters. The cgo tool will generate Go files
containing symbol names, unquoted. That can permit those symbol names
to inject Go code into a cgo-generated file. If that Go code uses the
//go:cgo_ldflag pragma, it can cause the C linker to run arbitrary
code when building a package. If you build an imported package we
permit arbitrary code at run time, but we don't want to permit it at
package build time. This CL prevents this in two ways.
In cgo, reject invalid symbols that contain non-printable or space
characters, or that contain anything that looks like a Go comment.
In the go tool, double check all //go:cgo_ldflag directives in
generated code, to make sure they follow the existing LDFLAG restrictions.
Thanks to Imre Rad / https://www.linkedin.com/in/imre-rad-2358749b for
reporting this.
Fixes CVE-2020-28367
Change-Id: Ia1ad8f3791ea79612690fa7d26ac451d0f6df7c1
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/895832
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/269658
Trust: Katie Hockman <katie@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
TestSetuidEtc() was failing sporadically on linux-ppc64. From the
three https://build.golang.org/ logs, it looked like the logged
errors could be associated with threads dying, but proc reads
were, in some way, racing with their demise.
Exploring ways to increase thread demise, revealed that races
of this type can happen on non-ppc64 systems, and that
os.IsNotExist(err) was not a sufficient error condition test
for a thread's status file disappearing. This change includes a
fix for that to.
The actual issue on linux-ppc64 appears to be tied to PID reaping
and reuse latency on whatever the build test environment is for
linux-ppc64-buildlet. I suspect this can happen on any linux
system, however, especially where the container has a limited PID
range.
The fix for this, limited to the test (the runtime syscall support
is unchanged), is to confirm that the Pid for the interrogated
thread's /proc/<TID>/status file confirms that it is still
associated with the test-process' PID.
linux-ppc64-buildlet:
go/bin/go test syscall -run=TestSetuidEtc -count=10000
ok syscall 104.285s
Fixes#42462
Change-Id: I55c84ab8361003570a405fa52ffec4949bf91113
Reviewed-on: https://go-review.googlesource.com/c/go/+/268717
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Store the PC instead of the string name of the function, and defer
that conversion until we need it.
Helper is still relatively expensive in CPU time (few hundred ns),
but memory allocation is now constant for a test rather than linear in
the number of times Helper is called.
benchstat:
name old time/op new time/op delta
TBHelper-4 1.30µs ±27% 0.53µs ± 1% -59.03% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
TBHelper-4 216B ± 0% 0B -100.00% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
TBHelper-4 2.00 ± 0% 0.00 -100.00% (p=0.008 n=5+5)
Change-Id: I6565feb491513815e1058637d086b0374fa94e19
GitHub-Last-Rev: c2329cf225
GitHub-Pull-Request: golang/go#38834
Reviewed-on: https://go-review.googlesource.com/c/go/+/231717
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This cl is a roll-forward of golang.org/cl/265758, which was rolled back
in golang.org/cl/268900. The changes made are removing cgofiles
from the list of files that are copied to objdir (because the cgofiles
themselves aren't actually provided to the compiler) and fixing test
cases to properly provide the overlay flag and to allow for paths with
backslashes (as in Windows).
The previous cl (golang.org/cl/262618) copied non-overlaid cgo files
to objdir, mostly to get around the issue that otherwise cgo-generated
files were written out with the wrong names (they'd get the base path
of the overlay file containing the replaced contents, instead of the
base path of the path whose contents are being replaced). So that CL
it would copy the files to objdir with the base path of the file
being replaced to circumvent that.
This CL changes cmd/go and cmd/cgo so that instead of copying
files, it passes the actual path of the file on disk either of
the original file (if it is not overlaid) or its replacement
file (if it is) as well as a flag --path_rewrite, newly added to
cmd/cgo, that specifies the actual original file path that corresponds
to the replaced files.
Updates #39958
Change-Id: Ia45b022f9d27cfce0f9ec6da5f3a9f53654c67b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/269017
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The comment explains differences between WalkDirFunc and WalkFunc,
but when this code moved out of path/filepath, we forgot to change
the reference to be filepath.WalkFunc. Fix that.
(The text should not be deleted, because path/filepath does not
contain this type - WalkDirFunc - nor this text anymore.)
Pointed out by Carl Johnson on CL 243916 post-submit.
For #41190.
Change-Id: I44c64d0b7e60cd6d3694cfd6d0b95468ec4612fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/268417
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
The Go 1.16 code freeze has recently started. This is a time to update
all golang.org/x/... module versions that contribute packages to the
std and cmd modules in the standard library to latest master versions.
Those versions have already gone through code review, and now they
will undergo additional testing during the upcoming freeze period.
If new issues in these dependencies are discovered, we have the freeze
period to address them. By the end of the freeze period, we will have
confidence that the Go 1.16 release and the dependency versions it has
selected are robust.
The dependency module versions that are selected in this commit are:
github.com/google/pprof v0.0.0-20201007051231-1066cbb265c7
github.com/ianlancetaylor/demangle v0.0.0-20200414190113-039b1ae3a340
golang.org/x/arch v0.0.0-20201008161808-52c3e6f60cff
golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
golang.org/x/mod v0.3.1-0.20200828183125-ce943fd02449
golang.org/x/net v0.0.0-20201029221708-28c70e62bb1d
golang.org/x/sys v0.0.0-20201110211018-35f3e6cf4a65
golang.org/x/text v0.3.4
golang.org/x/tools v0.0.0-20201110201400-7099162a900a
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
This change was created with a program from CL 256357 patch set 3
(which updates golang.org/x modules only) and the latest bundle tool,
but replacing golang.org/x/net version with a slightly older commit
golang/net@28c70e62bb due to #42498:
$ updatestd -goroot=$HOME/gotip -branch=master
> go version
go version devel +ecc3f5112e Thu Nov 5 23:21:33 2020 +0000 darwin/amd64
> go env GOROOT
/Users/dmitshur/gotip
> go version -m /Users/dmitshur/go/bin/bundle
/Users/dmitshur/go/bin/bundle: go1.15.4
path golang.org/x/tools/cmd/bundle
mod golang.org/x/tools v0.0.0-20201110201400-7099162a900a h1:5E6TPwSBG74zT8xSrVc8W59K4ch4NFobVTnh2BYzHyU=
dep golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
dep golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
updating module cmd in /Users/dmitshur/gotip/src/cmd
skipping github.com/chzyer/logex (out of scope, it's not a golang.org/x dependency)
skipping github.com/chzyer/readline (out of scope, it's not a golang.org/x dependency)
skipping github.com/chzyer/test (out of scope, it's not a golang.org/x dependency)
skipping github.com/google/pprof (out of scope, it's not a golang.org/x dependency)
skipping github.com/ianlancetaylor/demangle (out of scope, it's not a golang.org/x dependency)
skipping github.com/yuin/goldmark (out of scope, it's not a golang.org/x dependency)
skipping rsc.io/pdf (out of scope, it's not a golang.org/x dependency)
> go mod edit -go=1.16
> go get -d golang.org/x/arch@52c3e6f60cffa0133a3f9b2fc7f6862504a6cba0 golang.org/x/crypto@9e8e0b390897c84cad53ebe9ed2d1d331a5394d9 golang.org/x/mod@ce943fd02449f621243c9ea6e64098e84752b92b golang.org/x/net@28c70e62bb1d140c3f2579fb7bb5095134d9cb1e golang.org/x/sync@67f06af15bc961c363a7260195bcd53487529a21 golang.org/x/sys@35f3e6cf4a65a85bc280e5fe63faed8ac8b25721 golang.org/x/text@22f1617af38ed4cd65b3b96e02bab267e560155c golang.org/x/tools@7099162a900ae8260c5b97cfaf5f374243dfa742 golang.org/x/xerrors@5ec99f83aff198f5fbd629d6c8d8eb38a04218ca
> go mod tidy
> go mod vendor
updating module std in /Users/dmitshur/gotip/src
> go mod edit -go=1.16
> go get -d golang.org/x/crypto@9e8e0b390897c84cad53ebe9ed2d1d331a5394d9 golang.org/x/net@28c70e62bb1d140c3f2579fb7bb5095134d9cb1e golang.org/x/sys@35f3e6cf4a65a85bc280e5fe63faed8ac8b25721 golang.org/x/text@22f1617af38ed4cd65b3b96e02bab267e560155c golang.org/x/tools@7099162a900ae8260c5b97cfaf5f374243dfa742
> go mod tidy
> go mod vendor
updating bundles in /Users/dmitshur/gotip/src
> go generate -run=bundle std cmd
golang.org/x/net will be updated further later, after #42498 is fixed.
github.com/google/pprof and github.com/ianlancetaylor/demangle
contribute packages but are out of scope for this generated CL.
Also rename http2configureTransport in net/http to follow the internal
rename that happened in CL 264017 to fix the build.
For #36905.
Updates #41721.
Updates #42498.
Change-Id: Ifcd2e76f0406e389b6db88041ca51cd0a2115152
Reviewed-on: https://go-review.googlesource.com/c/go/+/266898
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
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This is an extra variable available via 'go env', but not read from the
user's environment. It corresponds to the same string that
runtime.Version returns, assuming a program is built by the same version
of Go.
It's similar to the output of 'go version', but without the "go version"
prefix nor the "$GOOS/$GOARCH" suffix.
The main use case here is tools, which often use 'go env' to query basic
information about the installed Go tree. Its version was one missing
piece of information, which required an extra call to 'go version'
before this change.
Fixes#41116.
Change-Id: I5c9d8c2ba856c816c9f4c462ba73c907b3441445
Reviewed-on: https://go-review.googlesource.com/c/go/+/265637
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
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Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Trust: Daniel Martí <mvdan@mvdan.cc>
The previous cl (golang.org/cl/262618) copied non-overlaid cgo files
to objdir, mostly to get around the issue that otherwise cgo-generated
files were written out with the wrong names (they'd get the base path
of the overlay file containing the replaced contents, instead of the
base path of the path whose contents are being replaced). So that CL
it would copy the files to objdir with the base path of the file
being replaced to circumvent that.
This CL changes cmd/go and cmd/cgo so that instead of copying
files, it passes the actual path of the file on disk either of
the original file (if it is not overlaid) or its replacement
file (if it is) as well as a flag --path_rewrite, newly added to
cmd/cgo, that specifies the actual original file path that corresponds
to the replaced files.
Updates #39958
Change-Id: Ic4aae5ef77fe405011fcdce7f6c162488d13daa2
Reviewed-on: https://go-review.googlesource.com/c/go/+/265758
Trust: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
SYNC is supposed to correspond to 'fast-BCR-serialization' which is
encoded as 'bcr 14,0'. In CL 197178 I accidentally modified the
encoding to 'bcr 7,0' which is a no-op. This CL reverses that change.
Fixes#42479.
Change-Id: I9918d93d720f5e12acc3014cde20d2d32cc87ee5
Reviewed-on: https://go-review.googlesource.com/c/go/+/268797
Run-TryBot: Michael Munday <mike.munday@ibm.com>
Trust: Michael Munday <mike.munday@ibm.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
https://man7.org/linux/man-pages/man2/copy_file_range.2.html#VERSIONS states:
A major rework of the kernel implementation occurred in 5.3. Areas
of the API that weren't clearly defined were clarified and the API
bounds are much more strictly checked than on earlier kernels.
Applications should target the behaviour and requirements of 5.3
kernels.
Rather than attempting to detect the file system for source and
destination files (which means two additional statfs syscalls) and skip
copy_file_range in case of known defects (e.g. CIFS -> CIFS), just
assume copy_file_range to be broken on kernels < 5.3.
Fixes#42400
Change-Id: I3a531296182c1d6e341772cc9d2be5bf83e52575
Reviewed-on: https://go-review.googlesource.com/c/go/+/268338
Trust: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
test_race_install checks that 'go test -i -race …' does not rebuild
already installed packages, by also passing '-v' and verifying that no
package names are printed to stderr.
CL 266368 added a deprecation message for the '-i' flag that caused
the stderr output to be non-empty, although it still does not print
any package names.
Updates #41696
Change-Id: I13e10e49b7c33139be9b13f24cb393c9f58fd85d
Reviewed-on: https://go-review.googlesource.com/c/go/+/268581
Trust: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
When either the server or client are lacking hardware support for
AES-GCM ciphers, indicated by the server lacking the relevant
instructions and by the client not putting AES-GCM ciphers at the top
of its preference list, reorder the preference list to de-prioritize
AES-GCM based ciphers when they are adjacent to other AEAD ciphers.
Also updates a number of recorded openssl TLS tests which previously
only specified TLS 1.2 cipher preferences (using -cipher), but not
TLS 1.3 cipher preferences (using -ciphersuites), to specify both
preferences, making these tests more predictable.
Fixes#41181.
Change-Id: Ied896c96c095481e755aaff9ff0746fb4cb9568e
Reviewed-on: https://go-review.googlesource.com/c/go/+/262857
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Trust: Katie Hockman <katie@golang.org>
This reverts commit 3a81338622.
Reason for revert: Some edge cases not properly covered due to changes within runtime traceback generation since 2017, that need to be examined. This change landed very late in the Go1.16 cycle.
Change-Id: I8cf6f46ea0ef6161d878e79943e6c7cdac94bccf
Reviewed-on: https://go-review.googlesource.com/c/go/+/268577
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
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Reviewed-by: Keith Randall <khr@golang.org>
This code was preserved just to do side-by-side testing while
transitioning to the Go implementation. There haven't been mismatch
issues, so drop the cgo code, which was making it hard to improve the Go
code without diverging.
Change-Id: I2a23039c31a46e88b94250aafbc98d4ea8daf22f
Reviewed-on: https://go-review.googlesource.com/c/go/+/232397
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This is a SHALL in RFC 7301, Section 3.2.
Also some more cleanup after NPN, which worked the other way around
(with the possibility that the client could pick a protocol the server
did not suggest).
Change-Id: I83cc43ca1b3c686dfece8315436441c077065d82
Reviewed-on: https://go-review.googlesource.com/c/go/+/239748
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This is a roll-forward of golang.org/cl/267197, which was reverted in
golang.org/cl/267357. It makes the following changes in addition to
the ones in the next paragraph: It avoids outputting trimpath
arguments for an overlay unless the overlay affects the package being
compiled (to avoid hitting windows command line argument limits), and
it fixes processing of regexps in the script test framework to treat
the first *non flag* argument to grep, stdout, and stderr as a regexp,
not just the first argument.
golang.org/cl/267917 was a roll-forward of golang.org/cl/262618, which
was reverted in golang.org/cl/267037. The only differences between
this CL and the original were the three calls to fflush from the C
files in build_overlay.txt, to guarantee that the string we were
expecting was
actually written out.
The CL requires rewriting the paths of the files passed to the cgo
tool toolchain to use the overlaid paths instead of the disk paths of
files. Because the directories of the overlaid paths don't exist in
general, the cgo tool have been updated to run in base.Cwd instead of
the package directory.
For #39958
Change-Id: I1bd96db257564bcfd95b3502aeca14d04bd28618
Reviewed-on: https://go-review.googlesource.com/c/go/+/267797
Trust: Michael Matloob <matloob@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Adds the (*tls.Conn).HandshakeContext method. This allows
us to pass the context provided down the call stack to
eventually reach the tls.ClientHelloInfo and
tls.CertificateRequestInfo structs.
These contexts are exposed to the user as read-only via Context()
methods.
This allows users of (*tls.Config).GetCertificate and
(*tls.Config).GetClientCertificate to use the context for
request scoped parameters and cancellation.
Replace uses of (*tls.Conn).Handshake with (*tls.Conn).HandshakeContext
where appropriate, to propagate existing contexts.
Fixes#32406
Change-Id: I33c228904fe82dcf57683b63627497d3eb841ff2
Reviewed-on: https://go-review.googlesource.com/c/go/+/246338
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Previously windows only returned the certificate-chain with the highest quality.
This change makes it so chains with a potentially lower quality
originating from other root certificates are also returned by verify.
Tests in verify_test flagged with systemLax are now allowed to pass if the system returns additional chains
Fixes#40604
Change-Id: I66edc233219f581039d47a15f2200ff627154691
Reviewed-on: https://go-review.googlesource.com/c/go/+/257257
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
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Without HOME or FOSSIL_HOME set, this test fails for me when run with
fossil 2.12.1.
Also verify that the 'go get' command produces an executable, which
helps to verify that the files extracted by fossil are not corrupted.
Updates #42323
Change-Id: Ie6f5d2eab6a6338e997a4f85591195e5bd9a0d37
Reviewed-on: https://go-review.googlesource.com/c/go/+/267884
Trust: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
Adds the following additional convenience fields to CertificateRequest:
* KeyUsage
* ExtKeyUsage
* UnknownExtKeyUsage
* IsCA
* MaxPathLen
* BasicConstraintsValid
* MaxPathLenZero
* SubjectKeyId
* PolicyIdentifier
These fields are parsed during ParseCertificateRequest and marshalled
during CreateCertificateRequest. The parsing/marshalling code is
factored out of parseCertificate and buildExtensions (which is renamed
buildCertExtensions). This has the side effect of making these methods
somewhat easier to read.
Documentation for the fields is copied from Certificate.
Example CSR created with all of these fields parsed with openssl:
$ openssl req -in ~/test-csr.pem -noout -text
Certificate Request:
Data:
Version: 0 (0x0)
Subject:
Subject Public Key Info:
Public Key Algorithm: id-ecPublicKey
Public-Key: (256 bit)
pub:
04:a4:cb:64:35:8e:dd:8c:2b:a6:f1:aa:39:d1:be:
d0:b9:95:1e:59:19:82:76:28:d3:85:1b:c6:88:62:
e1:15:33:be:26:18:80:14:fe:f4:d4:91:66:4e:a4:
a4:47:bd:53:db:f7:2e:e3:31:ce:5f:86:cb:92:59:
93:bb:d0:7f:a2
ASN1 OID: prime256v1
NIST CURVE: P-256
Attributes:
Requested Extensions:
X509v3 Key Usage: critical
Certificate Sign
X509v3 Extended Key Usage:
Any Extended Key Usage, 1.2.3
X509v3 Basic Constraints: critical
CA:TRUE, pathlen:0
X509v3 Subject Key Identifier:
01:02:03
X509v3 Certificate Policies:
Policy: 1.2.3
Signature Algorithm: ecdsa-with-SHA256
30:45:02:21:00:a7:88:e5:96:d4:ad:ae:24:26:ab:5f:15:6a:
3f:22:6d:0e:a6:ba:15:64:8d:78:34:f4:c4:7d:ac:37:b0:2a:
84:02:20:68:44:f0:8e:8a:1b:c1:68:be:14:a6:e3:83:41:fd:
2d:cc:00:aa:bc:50:f6:50:56:12:9e:a4:09:84:5c:bf:c1
Fixes#37172
Change-Id: Ife79d01e203827ef0ac3c787aa13c00d0751a1ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/233163
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When a variable symbol is both imported (possibly through
inlining) and linkname'd, make sure its LSym is marked as
non-package for symbol indexing in the object file, so it is
resolved by name and dedup'd with the original definition.
Fixes#42401.
Change-Id: I8e90c0418c6f46a048945c5fdc06c022b77ed68d
Reviewed-on: https://go-review.googlesource.com/c/go/+/268178
Trust: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: Jeremy Faller <jeremy@golang.org>
The go command runs commands like git and hg to download modules.
In the past, we have had problems with security bugs in version
control systems becoming security bugs in “go get”.
The original modules draft design removed use of these commands
entirely, saying:
> We want to move away from invoking version control tools such as bzr,
> fossil, git, hg, and svn to download source code. These fragment the
> ecosystem: packages developed using Bazaar or Fossil, for example, are
> effectively unavailable to users who cannot or choose not to install
> these tools. The version control tools have also been a source of
> exciting security problems. It would be good to move them outside the
> security perimeter.
The removal of these commands was not possible in the end: being able
to fetch directly from Git repos is too important, especially for
closed source. But the security exposure has not gone away.
We remain vulnerable to problems in VCS systems, especially the less
scrutinized ones.
This change adds a GOVCS setting to let users control which version
control systems are allowed by default.
It also changes the default allowed version control systems to git and hg
for public code and any version control system for private code
(import path or module path matched by the GOPRIVATE setting).
See the changes in alldocs.go for detailed documentation.
See #41730 for proposal and discussion.
Fixes#41730.
[Replay of CL 266420. See changes from Patch Set 1 for updates to fix
a few long tests.]
Change-Id: I4fe93804548956c42aea985368b4571bdb220f48
Reviewed-on: https://go-review.googlesource.com/c/go/+/267888
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Extended the sorting logic to be stable even when there are two roots
with the same name and notBefore timestamp, like the GlobalSign ones.
Updates #38843
Change-Id: Ie4db0bb8b6a8b5ffbb7390b6bd527fc0c3badaca
Reviewed-on: https://go-review.googlesource.com/c/go/+/266677
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Filippo Valsorda <filippo@golang.org>
Currently, the benchmark output from the testing package prints small
values with three significant figures. This means it can only
distinguish 1 part in 100, or a 1% error, which can be enough to throw
off further analysis of the output. This CL increases it to four
significant figures. For time values, at least, anything beyond four
significant figures is almost certainly noise.
Fixes#34626.
Change-Id: I3bcf305427130026276e6a4c78167989319f280c
Reviewed-on: https://go-review.googlesource.com/c/go/+/267102
Trust: Austin Clements <austin@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Instead of parsing the PEM files and then storing the *Certificate
values forever, still parse them to see if they're valid and pick out
some fields, but then only store the decoded pem.Block.Bytes until
that cert is first needed.
Saves about 500K of memory on my (Debian stable) machine after doing a
tls.Dial or calling x509.SystemCertPool.
A more aggressive version of this is still possible: we can not keep
the pem.Block.Bytes in memory either, and re-read them from disk when
necessary. But dealing with files disappearing and even large
multi-cert PEM files changing (with offsets sliding around) made this
conservative version attractive. It doesn't change the
slurp-roots-on-startup semantics. It just does so with less memory
retained.
Change-Id: I3aea333f4749ae3b0026042ec3ff7ac015c72204
Reviewed-on: https://go-review.googlesource.com/c/go/+/230025
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This will allow building CertPools that consume less memory. (Most
certs are never accessed. Different users/programs access different
ones, but not many.)
This CL only adds the new internal mechanism (and uses it for the
old AddCert) but does not modify any existing root pool behavior.
(That is, the default Unix roots are still all slurped into memory as
of this CL)
Change-Id: Ib3a42e4050627b5e34413c595d8ced839c7bfa14
Reviewed-on: https://go-review.googlesource.com/c/go/+/229917
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Reviewed-by: Roland Shoemaker <roland@golang.org>
CL 244579 added guard clauses to prevent a faulty state that was
possible under the incorrect logic of the uniquePred loop in
addLocalInductiveFacts. That faulty state was still making the
intended optimization, but not for the correct reason.
Removing the faulty state also removed the overly permissive application
of the optimization, and therefore made these two tests fail.
We disabled the tests of this optimization in CL 244579 to allow us to
quickly apply the fix in the CL. This CL now corrects the logic of the
uniquePred loop in order to apply the optimization correctly.
The comment above the uniquePred loop says that it will follow unique
predecessors until it reaches a join point. Without updating the child
node on each iteration, it cannot follow the chain of unique
predecessors more than one step. Adding the update to the child node
on each iteration of the loop allows the logic to follow the chain of
unique predecessors until reaching a join point (because a non-unique
predecessor will signify a join point).
Updates #40502.
Change-Id: I23d8367046a2ab3ce4be969631f9ba15dc533e6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/246157
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This CL makes it so that instead of printing massive stack traces during
endless recursion, which spams users and aren't useful, it now prints out
the top and bottom 50 frames. If the number of frames <= 100
(_TracebackMaxFrames), we'll just print all the frames out.
Modified gentraceback to return counts of:
* ntotalframes
* nregularframes
which allows us to get accurate counts of the various kinds of frames.
While here, also fixed a bug that resulted from CL 37222, in which we
no longer accounted for decrementing requested frame skips, and assumed
that when printing, that skip would always be 0. The fix is instead to add
precondition that we'll only print if skip <= 0, but also decrement skip
as we iterate.
Fixes#7181.
Fixes#24628.
Change-Id: Ie31ec6413fdfbe43827b254fef7d99ea26a5277f
Reviewed-on: https://go-review.googlesource.com/c/go/+/37222
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This CL adds support for inlining type switches, including exporting
and importing them.
Type switches are represented mostly the same as expression switches.
However, if the type switch guard includes a short variable
declaration, then there are two differences: (1) there's an ONONAME
(in the OTYPESW's Left) to represent the overall pseudo declaration;
and (2) there's an ONAME (in each OCASE's Rlist) to represent the
per-case variables.
For simplicity, this CL simply writes out each variable separately
using iimport/iiexport's normal Vargen mechanism for disambiguating
identically named variables within a function. This could be improved
somewhat, but inlinable type switches are probably too uncommon to
merit the complexity.
While here, remove "case OCASE" from typecheck1. We only type check
"case" clauses as part of a "select" or "switch" statement, never as
standalone statements.
Fixes#37837
Change-Id: I8f42f6c9afdd821d6202af4a6bf1dbcbba0ef424
Reviewed-on: https://go-review.googlesource.com/c/go/+/266203
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Trust: Matthew Dempsky <mdempsky@google.com>
This commit is a copy of filepath.WalkDir adapted to use fs.FS
instead of the native OS file system. It is the last implementation
piece of the io/fs proposal.
The original io/fs proposal was to adopt filepath.Walk, but we
have since introduced the more efficient filepath.WalkDir (#42027),
so this CL adopts that more efficient option instead.
(The changes in path/filepath bring the two copies more in line
with each other. The main change is unembedding the field
in statDirEntry, so that the fs.DirEntry passed to the WalkDirFunc
for the root of the tree does not have any extra methods.)
For #41190.
Change-Id: I9359dfcc110338c0ec64535f22cafb38d0b613a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/243916
Trust: Russ Cox <rsc@golang.org>
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Reviewed-by: Rob Pike <r@golang.org>
WalkDir is like Walk but can use ReadDir to read directories,
instead of Readdirnames + Lstat on every entry,
which is usually a significant performance improvement.
(The Lstat can still happen if the walk function calls d.Info.)
Fixes#42027.
[Replay of CL 266240 after it was reverted due to accidentally
enabling on Windows a test that does not work on Windows.
The original code only ran the test on os.Getuid() > 0.
The rolled-back CL skipped the test on os.Getuid() == 0.
But on Windows, os.Getuid(), it turns out, always returns -1.
So what looked like a test for root was also excluding Windows.
This CL revises the test to skip Windows explicitly.]
Change-Id: I9b3661013d6449b7486532445d934ae91e5393ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/267887
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
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Optimize combinations of left and right shifts by a constant value
into a 'rotate then insert selected bits [into zero]' instruction.
Use the same instruction for contiguous masks since it has some
benefits over 'and immediate' (not restricted to 32-bits, does not
overwrite source register).
To keep the complexity of this change under control I've only
implemented 64 bit operations for now.
There are a lot more optimizations that can be done with this
instruction family. However, since their function overlaps with other
instructions we need to be somewhat careful not to break existing
optimization rules by creating optimization dead ends. This is
particularly true of the load/store merging rules which contain lots
of zero extensions and shifts.
This CL does interfere with the store merging rules when an operand
is shifted left before it is stored:
binary.BigEndian.PutUint64(b, x << 1)
This is unfortunate but it's not critical and somewhat complex so
I plan to fix that in a follow up CL.
file before after Δ %
addr2line 4117446 4117282 -164 -0.004%
api 4945184 4942752 -2432 -0.049%
asm 4998079 4991891 -6188 -0.124%
buildid 2685158 2684074 -1084 -0.040%
cgo 4553732 4553394 -338 -0.007%
compile 19294446 19245070 -49376 -0.256%
cover 4897105 4891319 -5786 -0.118%
dist 3544389 3542785 -1604 -0.045%
doc 3926795 3927617 +822 +0.021%
fix 3302958 3293868 -9090 -0.275%
link 6546274 6543456 -2818 -0.043%
nm 4102021 4100825 -1196 -0.029%
objdump 4542431 4548483 +6052 +0.133%
pack 2482465 2416389 -66076 -2.662%
pprof 13366541 13363915 -2626 -0.020%
test2json 2829007 2761515 -67492 -2.386%
trace 10216164 10219684 +3520 +0.034%
vet 6773956 6773572 -384 -0.006%
total 107124151 106917891 -206260 -0.193%
Change-Id: I7591cce41e06867ba10a745daae9333513062746
Reviewed-on: https://go-review.googlesource.com/c/go/+/233317
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Michael Munday <mike.munday@ibm.com>
Remove openbsd/mips64 from incomplete ports lists - all of the necessary code
has landed and we want to run tests so we can see/deal with remaining failures.
Update #40995
Change-Id: I5d4f89af82ff3abe57570a9a8abf889498093d32
Reviewed-on: https://go-review.googlesource.com/c/go/+/267606
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When the compiler refers to a runtime builtin, it emits an indexed
symbol reference in the object file via predetermined/preassigned ID
within the PkgIdxBuiltin pseudo-package. At link time when the loader
encounters these references, it redirects them to the corresponding
defined symbol in the runtime package. This redirection process
currently assumes that if a runtime builtin is referenced, we'll
always have a definition for it. This assumption holds in most cases,
however for the builtins "runtime.racefuncenter" and
"runtime.racefuncexit", we'll only see definitions if the runtime
package we're linking against was built with "-race".
In the bug in question, build passes "-gcflags=-race" during
compilation of the main package, but doesn't pass "-race" directly to
'go build', and as a result the final link combines a
race-instrumented main with a non-race runtime; this results in R_CALL
relocations with zero-valued target symbols, resulting in a panic
during stack checking.
This patch changes the loader's resolve method to detect situations
where we're asking for builtin "runtime.X", but the runtime package
read in doesn't contain a definition for X.
Fixes#42396.
Change-Id: Iafd38bd3b0f7f462868d120ccd4d7d1b88b27436
Reviewed-on: https://go-review.googlesource.com/c/go/+/267881
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Tools often need to associate errors not with a single position, but
with a span of source code. For example, gopls currently estimates
diagnostic spans using heuristics to expand the positions reported by
the type checker to surrounding source code. Unfortunately this is often
inaccurate.
This CL lays the groundwork to solve this within go/types by adding a
start and end position to type checker errors. This is an experimental
API, both because we are uncertain of the ideal representation for these
spans and because their initial positioning is naive. In most cases this
CL simply expands errors to the surrounding ast.Node being typechecked,
if available. This might not be the best error span to present to the
user. For these reasons the API is unexported -- gopls can read these
positions using reflection, allowing us to gain experience and improve
them during the next development cycle.
For golang/go#42290
Change-Id: I39a04d70ea2bb2134b4d4c937f32b2ddb4456430
Reviewed-on: https://go-review.googlesource.com/c/go/+/265250
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
Trust: Robert Griesemer <gri@golang.org>
Test script expects the regexp argument for stdout, stderr, and cmp
to be the first argument after the command, but that might not be the
case if the -q or -count flags are provided. Treat the first argument
after a flag as a regexp instead.
For #39958
Change-Id: I369926109ec10cca8b2c3baca27e7a3f7baf364b
Reviewed-on: https://go-review.googlesource.com/c/go/+/267877
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
startm contains a critical section from when it takes ownership of a P
(either on function entry or call to pidleput) until it wakes the M
receiving the P. If preempted in this critical section, the owned P is
left in limbo. If preempted for a GC stop, there will be nothing to stop
the owned P and STW will wait forever.
golang.org/cl/232298 introduced the first call to startm that is not on
the system stack (via a wakep call), introducing the possibility of
preemption. Disable preemption in startm to ensure this remains
non-preemptible.
Since we're not always on the system stack anymore, we also need to be
careful in allocm.
Updates #42237
Change-Id: Icb95eef9eb262121856485316098331beea045da
Reviewed-on: https://go-review.googlesource.com/c/go/+/267257
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Pratt <mpratt@google.com>
Previously, we resolved each argument to 'go get' to a package path or
module path based on what was in the build list at existing versions,
even if the argument specified a different version explicitly. That
resulted in bugs like #37438, in which we variously resolved the wrong
version or guessed the wrong argument type for what is unambiguously a
package argument at the requested version.
We were also using a two-step upgrade/downgrade algorithm, which could
not only upgrade more that is strictly necessary, but could also
unintentionally upgrade *above* the requested versions during the
downgrade step.
This change instead uses an iterative approach, with an explicit
disambiguation step for the (rare) cases where an argument could match
the same package path in multiple modules. We use a hook in the
package loader to halt package loading as soon as an incorrect version
is found — preventing over-resolving — and verify that the result
after applying downgrades successfully obtained the requested versions
of all modules.
Making 'go get' be correct and usable is especially important now that
we are defaulting to read-only mode (#40728), for which we are
recommending 'go get' more heavily.
While I'm in here refactoring, I'm also reworking the API boundary
between the modget and modload packages. Previously, the modget
package edited the build list directly, and the modload package
accepted the edited build list without validation. For lazy loading
(#36460), the modload package will need to maintain additional
metadata about the requirement graph, so it needs tighter control over
the changes to the build list.
As of this change, modget no longer invokes MVS directly, but instead
goes through the modload package. The resulting API gives clearer
reasons in case of updates, which we can use to emit more useful
errors.
Fixes#37438
Updates #36460
Updates #40728
Change-Id: I596f0020f3795870dec258147e6fc26a3292c93a
Reviewed-on: https://go-review.googlesource.com/c/go/+/263267
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This allows a single QueryPattern call to resolve a path that could be
either a package or a module. It is important to be able to make a
single QueryPattern call — rather than a QueryPattern followed by a
Query for the specific module path — to provide appropriate fallback
behavior: if the proxy returns package results but does not contain a
module result, we don't want to fall back to the next proxy to look
for the (probably-nonexistent) module.
For #37438
Change-Id: I419b8bb3ab4565f443bb5cee9a8b206f453b9801
Reviewed-on: https://go-review.googlesource.com/c/go/+/266657
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
CL 242083 corrected an inaccurate error message related to the
assignability of untyped constant values. Previously the error message
was of the form "cannot convert ... to ...", which is misleading when
there is no explicit conversion in the syntax. The new error message
corrected this to "cannot use ... as ... in ...", but also appended an
inner error message that can be quite verbose. For example:
cannot use "123" (untyped string constant) as int value in assignment:
cannot convert "123" (untyped string constant) to int"
This might be more accurate, but is a regression in readability. Correct
this by only including the inner error message in the rare cases where
it is helpful: if the constant value overflows or is truncated.
For golang/go#22070
Change-Id: I8b8ee6ef713f64facc319894be09398b0b5ea500
Reviewed-on: https://go-review.googlesource.com/c/go/+/267717
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Remove all cpu features from the ARM64 struct that are not initialized
to reduce cache lines used and to avoid those features being
accidentially used without actual detection if they are present.
Add missing option to mask the CPUID feature.
Change-Id: I94bf90c0655de1af2218ac72117ac6c52adfc289
Reviewed-on: https://go-review.googlesource.com/c/go/+/267658
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Martin Möhrmann <moehrmann@google.com>
Fixes the check for RFC 5322 "obsolete time zone" to ensure
that we correctly extract the entire date from the "T" of the
implied time zone.
Obsolete Time zones come in the form:
* GMT
* PST
* MDT
etc, as per Section 4.3 of RFC 5322,
https://tools.ietf.org/html/rfc5322#section-4.3.
The prior check from CL 117596 erronenously used strings.Index
which selects the first "T", and that meant that dates containing
days "Tue" or "Thu" could not be parsed.
We also now deal with "T" in the CFWS "Comment Folding White Space".
Thus we'll now accept dates:
* Thu, 20 Nov 1997 09:55:06 MDT
* Thu, 20 Nov 1997 09:55:06 MDT (MDT)
* Fri, 21 Nov 1997 09:55:06 MDT (This comment)
* Fri, 21 Nov 1997 09:55:06 MDT (MDT
Fixes#39260
Change-Id: I6d59d99bc4f05a82582c826b5c5a080a25fd999b
Reviewed-on: https://go-review.googlesource.com/c/go/+/235200
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
The go command runs commands like git and hg to download modules.
In the past, we have had problems with security bugs in version
control systems becoming security bugs in “go get”.
The original modules draft design removed use of these commands
entirely, saying:
> We want to move away from invoking version control tools such as bzr,
> fossil, git, hg, and svn to download source code. These fragment the
> ecosystem: packages developed using Bazaar or Fossil, for example, are
> effectively unavailable to users who cannot or choose not to install
> these tools. The version control tools have also been a source of
> exciting security problems. It would be good to move them outside the
> security perimeter.
The removal of these commands was not possible in the end: being able
to fetch directly from Git repos is too important, especially for
closed source. But the security exposure has not gone away.
We remain vulnerable to problems in VCS systems, especially the less
scrutinized ones.
This change adds a GOVCS setting to let users control which version
control systems are allowed by default.
It also changes the default allowed version control systems to git and hg
for public code and any version control system for private code
(import path or module path matched by the GOPRIVATE setting).
See the changes in alldocs.go for detailed documentation.
See #41730 for proposal and discussion.
Fixes#41730.
Change-Id: I1999ddf7445b36a7572965be5897c7a1ff7f4265
Reviewed-on: https://go-review.googlesource.com/c/go/+/266420
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
WalkDir is like Walk but can use ReadDir to read directories,
instead of Readdirnames + Lstat on every entry,
which is usually a significant performance improvement.
(The Lstat can still happen if the walk function calls d.Info.)
Fixes#42027.
Change-Id: Ie11024b23be2656e320d41fd81ff0d8810aa729e
Reviewed-on: https://go-review.googlesource.com/c/go/+/266240
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The wrong value for the first reg parameter was selected.
Likewise the wrong opcode was selected. This should match
rlwnm (rrr type), not rlwinm (irr type).
Similarly, fix the optab matching rules so clrlslwi does
not match reg,reg,const,reg arguments. This is not a valid
operand combination for clrlslwi.
Fixes#42368
Change-Id: I4eb16d45a760b9fd3f497ef9863f82465351d39f
Reviewed-on: https://go-review.googlesource.com/c/go/+/267421
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
The refactoring of this code while adding ReadDir stopped
pre-allocating a 100-entry slice for the results.
That seemed like a good idea in general, since many
directories have nowhere near 100 entries, but it had the
side effect of returning a nil slice for an empty directory.
Some “golden” tests that are too sensitive about nil vs not
inside Google broke because Readdirnames(-1) was now
returning nil instead of []string{} on an empty directory.
It seems likely there are other such tests in the wild, and
it doesn't seem worth breaking them.
This commit restores the non-nil-ness of the old result,
without restoring the excessive preallocation.
Fixes#42367.
Change-Id: I2be72030ac703346e859a97c2d4e456fadfce9b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/267637
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
A recent update of the Fossil SCM application changes
the line prefix when the fossil info command is used.
Instead of the revision hash starting with "uuid:", it has been
changed to "hash:".
Fossil check-in introducing this change:
https://fossil-scm.org/home/info/8ad5e4690854a81a
To support older and new versions, fossilParseStat will
now check for either version of the prefix when attempting
to find the line containing the hash of the desired revision.
Fixes#42323
Change-Id: I6eff49f9989b37b295322a8569e222a1fd02f6e3
GitHub-Last-Rev: f4e6652307
GitHub-Pull-Request: golang/go#42324
Reviewed-on: https://go-review.googlesource.com/c/go/+/267080
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The LDANDx instructions were misleading because they correspond to the
mnemonic LDCLRx as defined in the Arm Architecture Reference Manual for
Armv8. This changes the assembler to use the same mnemonic as the GNU
assembler and the manual.
The instruction has the form:
LDCLRx Rs, (Rb), Rt: *Rb -> Rt, Rs AND NOT(*Rb) -> *Rb
Change-Id: I94ae003e99e817209bba1afe960e612bf3a0b410
Reviewed-on: https://go-review.googlesource.com/c/go/+/267138
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: fannie zhang <Fannie.Zhang@arm.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: fannie zhang <Fannie.Zhang@arm.com>
Add a physPageAlignedStack boolean which if set, results in over allocation
by a physical page, the allocation being rounded to physical page alignment
and the unused memory surrounding the allocation being freed again.
OpenBSD/octeon has 16KB physical pages and requires stacks to be physical page
aligned in order for them to be remapped as MAP_STACK. This change allows Go
to work on this platform.
Based on a suggestion from mknyszek in issue #41008.
Updates #40995Fixes#41008
Change-Id: Ia5d652292b515916db473043b41f6030094461d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/266919
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This is a partial revert of https://go-review.googlesource.com/c/go/+/248219
because we found that a non-trivial amount of code erroneously calls
ParseFloat(s, 10) or even ParseFloat(s, 0) and expects it to work --
before that change was merged, ParseFloat accepted a bitSize of
anything other than 32 or 64 to mean 64 (and ParseComplex was similar).
So revert that behavior to avoid breaking people's code, and add tests
for this.
I may add a vet check to flag ParseFloat(s, not_32_or_64) in a later
change.
See #42297 for more details.
Change-Id: I4bc0156bd74f67a39d5561b6e5fde3f2d20bd622
Reviewed-on: https://go-review.googlesource.com/c/go/+/267319
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Previous fix in issue #20929 for adding comment marker does
not check whether string field have // prefix or not.
This commit ensures string field does not contain // before adding
prefix to the line. Test also included in this commit.
Fixes#40992
Change-Id: Ibc5e8ef147eeb2ed732fb9e19815c8b21fcfb2ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/251237
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
The code I wrote in ldmacho.go in CL 266373 was plainly wrong. It
didn't carry rAdd over correctly. Fixed. Also added sign extension
(as ld64 does).
Internal linking with -race mode now works. Enable it.
Updates #38485.
Change-Id: I78aa949687bf6a0987913059059160b018c7560e
Reviewed-on: https://go-review.googlesource.com/c/go/+/267097
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This change modifies the consistent stats implementation to keep the
per-P sequence counter on each P instead of each mcache. A valid mcache
is not available everywhere that we want to call e.g. allocSpan, as per
issue #42339. By decoupling these two, we can add a mechanism to allow
contexts without a P to update stats consistently.
In this CL, we achieve that with a mutex. In practice, it will be very
rare for an M to update these stats without a P. Furthermore, the stats
reader also only needs to hold the mutex across the update to "gen"
since once that changes, writers are free to continue updating the new
stats generation. Contention could thus only arise between writers
without a P, and as mentioned earlier, those should be rare.
A nice side-effect of this change is that the consistent stats acquire
and release API becomes simpler.
Fixes#42339.
Change-Id: Ied74ab256f69abd54b550394c8ad7c4c40a5fe34
Reviewed-on: https://go-review.googlesource.com/c/go/+/267158
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change moves the responsibility of throwing if an mcache is not
available to the caller, because the inlining cost of throw is set very
high in the compiler. Even if it was reduced down to the cost of a usual
function call, it would still be too expensive, so just move it out.
This choice also makes sense in the context of #42339 since we're going
to have to handle the case where we don't have an mcache to update stats
in a few contexts anyhow.
Also, add getMCache to the list of functions that should be inlined to
prevent future regressions.
getMCache is called on the allocation fast path and because its not
inlined actually causes a significant regression (~10%) in some
microbenchmarks.
Fixes#42305.
Change-Id: I64ac5e4f26b730bd4435ea1069a4a50f55411ced
Reviewed-on: https://go-review.googlesource.com/c/go/+/267157
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This is a roll-forward of golang.org/cl/262618, which was reverted in
golang.org/cl/267037. The only differences between this CL and the
original are the three calls to fflush from the C files in
build_overlay.txt, to guarantee that the string we're expecting is
actually written out.
This requires rewriting the paths of the files passed to the cgo tool
toolchain to use the overlaid paths instead of the disk paths of
files. Because the directories of the overlaid paths don't exist in
general, the cgo tool have been updated to run in base.Cwd instead of
the package directory.
For #39958
Change-Id: If7e5e057c62c0c22ddb724f9fe650902fc5f4832
Reviewed-on: https://go-review.googlesource.com/c/go/+/267197
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Michael Matloob <matloob@golang.org>
In Go 1.12, we changed the runtime to use MADV_FREE when available on
Linux (falling back to MADV_DONTNEED) in CL 135395 to address issue
#23687. While MADV_FREE is somewhat faster than MADV_DONTNEED, it
doesn't affect many of the statistics that MADV_DONTNEED does until
the memory is actually reclaimed under OS memory pressure. This
generally leads to poor user experience, like confusing stats in top
and other monitoring tools; and bad integration with management
systems that respond to memory usage.
We've seen numerous issues about this user experience, including
#41818, #39295, #37585, #33376, and #30904, many questions on Go
mailing lists, and requests for mechanisms to change this behavior at
run-time, such as #40870. There are also issues that may be a result
of this, but root-causing it can be difficult, such as #41444 and
#39174. And there's some evidence it may even be incompatible with
Android's process management in #37569.
This CL changes the default to prefer MADV_DONTNEED over MADV_FREE, to
favor user-friendliness and minimal surprise over performance. I think
it's become clear that Linux's implementation of MADV_FREE ultimately
doesn't meet our needs. We've also made many improvements to the
scavenger since Go 1.12. In particular, it is now far more prompt and
it is self-paced, so it will simply trickle memory back to the system
a little more slowly with this change. This can still be overridden by
setting GODEBUG=madvdontneed=0.
Fixes#42330 (meta-issue).
Fixes#41818, #39295, #37585, #33376, #30904 (many of which were
already closed as "working as intended").
Change-Id: Ib6aa7f2dc8419b32516cc5a5fc402faf576c92e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/267100
Trust: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Steps run:
$ cd $(go env GOROOT)/src
$ go get -d golang.org/x/sys
$ go mod tidy
$ go mod vendor
$ go generate syscall/... internal/syscall/...
$ cd cmd
$ go get -d golang.org/x/sys
$ go mod tidy
$ go mod vendor
$ cd ..
$ git add .
This change subsumes CL 260860.
For #36905
Change-Id: I7c677c6aa1ad61b9cbd8cf9ed208ed5a30f29c87
Reviewed-on: https://go-review.googlesource.com/c/go/+/267103
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Adjust mksyscall_windows.go to activate module mode and set
-mod=readonly, and to suppress its own deprecation warning when run
from within GOROOT/src.
We can't vendor the mkwinsyscall tool in to the std module directly,
because std-vendored dependencies (unlike the dependencies of all
other modules) turn into actual, distinct packages in 'std' when
viewed from outside the 'std' module. We don't want to introduce a
binary in the 'std' meta-pattern, but we also don't particularly want
to add more special-cases to the 'go' command right now when we have
an existing wrapper program that can do the job.
I also regenerated the affected packages to ensure that they are
consistent with the current version of mksyscall, which produced some
declaration-order changes in
internal/syscall/windows/zsyscall_windows.go.
Fixes#41916
Updates #25922
Change-Id: If6e6f8ba3dd372a7ecd6820ee6c0ca38d55f0f35
Reviewed-on: https://go-review.googlesource.com/c/go/+/261499
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
We already remove racefuncenter and racefuncexit if they are not
needed (i.e. the function doesn't have any other race calls).
racefuncenterfp is like racefuncenter but used on LR machines.
Remove unnecessary racefuncenterfp as well.
Change-Id: I65edb00e19c6d9ab55a204cbbb93e9fb710559f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/267099
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: David Chase <drchase@google.com>
Optimize small (s <= 32) zeroing/moving operations on riscv64.
Avoid generating unaligned memory accesses.
The code is almost one to one translation of the corresponding
mips64 rules with additional rule for s=32.
Change-Id: I753b0b8e53cb9efcf43c8080cab90f3d03539fb8
Reviewed-on: https://go-review.googlesource.com/c/go/+/266217
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Add "go/analysis/passes/testinggoroutine" from x/tools and vendor its source in.
This pass will catch misuses of:
* testing.T.Fail*
* testing.T.Fatal*
* testing.T.Skip*
inside goroutines explicitly started by the go keyword.
The pass was implemented in CL 212920.
While here, found 2 misuses in:
* database/sql/sql_test.go
* runtime/syscall_windows_test.go
and fixed them in CL 235527.
Fixes#5746
Change-Id: I1740ad3f1d677bb5d78dc5d8d66bac6ec287a2b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/235677
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
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Trust: Emmanuel Odeke <emmanuel@orijtech.com>
In golang.org/cl/266199, I reused the existing code in inlining that
recognizes anonymous variables. However, it turns out that code
mistakenly recognizes anonymous return parameters as named when
inlining a function from the same package.
The issue is funcargs (which is only used for functions parsed from
source) synthesizes ~r names for anonymous return parameters, but
funcargs2 (which is only used for functions imported from export data)
does not.
This CL fixes the behavior so that anonymous return parameters are
handled identically whether a function is inlined within the same
package or across packages. It also adds a proper cross-package test
case demonstrating #33160 is fixed in both cases.
Change-Id: Iaa39a23f5666979a1f5ca6d09fc8c398e55b784c
Reviewed-on: https://go-review.googlesource.com/c/go/+/266719
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Trust: Matthew Dempsky <mdempsky@google.com>
(*Process).Signal returns an error sentinel, previously errFinished,
when (*Process).done or syscall.ESRCH. Callers would like the ability to
test for this state, so the value has been exported as ErrProcessDone.
Fixes#39444
Change-Id: I510e7647cc032af290180de5149f35ab7b09a526
Reviewed-on: https://go-review.googlesource.com/c/go/+/242998
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Sign extension for consts is unnecessary and zero extension for consts can be avoided
via casts. This removes over 16,000 instructions from the Go binary, in part because it
allows for better zero const absorbtion in blocks - for example,
`(BEQ (MOVBU (MOVBconst [0])) cond yes no)` now becomes `(BEQZ cond yes no)` when
this change is combined with existing rules.
Change-Id: I27e791bfa84869639db653af6119f6e10369ba3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/265041
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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This requires rewriting the paths of the files passed to the cgo tool
toolchain to use the overlaid paths instead of the disk paths of
files. Because the directories of the overlaid paths don't exist in
general, the cgo tool have been updated to run in base.Cwd instead of
the package directory.
For #39958
Change-Id: I8986de889f56ecc2e64fa69f5f6f29fa907408f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/262618
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
cmd/cgo now has a -trimpath flag that behaves the same as the
-trimpath flag to cmd/compile. This will be used to correct paths
to cgo files that are overlaid.
The code that processes trimpath in internal/objapi has been slightly
refactored because it's currently only accessible via AbsFile, which
does some additional processing to the path names. Now an
ApplyRewrites function is exported that just applies the trimpath
rewrites.
Also remove unused srcfile argument to cmd/cgo.(*Package).godefs.
For #39958
Change-Id: I497d48d0bc2fe1f6ab2b5835cbe79f15b839ee59
Reviewed-on: https://go-review.googlesource.com/c/go/+/266358
Trust: Michael Matloob <matloob@golang.org>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
Changed fmt.go to print out some extra information for various kinds of
Nodes. This includes some extra (small) info in the %j (jconv) output,
and some missing sections (such as Dcls and the body of a closure) in
nodedump().
Also, added some extra doc comments for a few Node types in syntax.go
Change-Id: I2ec7184e2abe0d5fbe3fb5a2506da7c7b06f2fb1
Reviewed-on: https://go-review.googlesource.com/c/go/+/266437
Run-TryBot: Dan Scales <danscales@google.com>
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Currently worldsema is not released with direct handoff, so the
semaphore is an unfair synchronization mechanism. If, for example,
ReadMemStats is called in a loop, it can continuously stomp on attempts
by the GC to stop the world.
Note that it's specifically possible for ReadMemStats to delay a STW to
end GC since ReadMemStats is able to STW during a GC since #19112 was
fixed.
While this particular case is unlikely and the right answer in most
applications is to simply not call such an expensive operation in a
loop, this pattern is used often in tests.
Fixes#40459.
Change-Id: Ia4a54f0fd956ea145a319f9f06c4cd37dd52fd8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/243977
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Reviewed-by: David Chase <drchase@google.com>
We use systemstack on the locking path to avoid stack splits which could
cause locks to be recorded out of order (see comment on lockWithRank).
This concern is irrelevant on lock assertions, where we simply need to
see if a lock is held and don't care if another is taken in the
meantime. Thus we can simply drop these unless we actually need to
crash.
Updates #40677
Change-Id: I85d730913a59867753ee1ed0386f8c5efda5c432
Reviewed-on: https://go-review.googlesource.com/c/go/+/266718
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Some functions that required holding the heap lock _or_ world stop have
been simplified to simply requiring the heap lock. This is conceptually
simpler and taking the heap lock during world stop is guaranteed to not
contend. This was only done on functions already called on the
systemstack to avoid too many extra systemstack calls in GC.
Updates #40677
Change-Id: I15aa1dadcdd1a81aac3d2a9ecad6e7d0377befdc
Reviewed-on: https://go-review.googlesource.com/c/go/+/250262
Run-TryBot: Michael Pratt <mpratt@google.com>
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Stopping the world is an implicit lock for many operations, so we should
assert the world is stopped in functions that require it.
This is enabled along with the rest of lock ranking, though it is a bit
orthogonal and likely cheap enough to enable all the time should we
choose.
Requiring a lock _or_ world stop is common, so that can be expressed as
well.
Updates #40677
Change-Id: If0a58544f4251d367f73c4120c9d39974c6cd091
Reviewed-on: https://go-review.googlesource.com/c/go/+/248577
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https://reviews.llvm.org/D90435 is the counterpart in LLVM TSAN.
race_linux_arm64.syso is built with LLVM commit
00da38ce2d36c07f12c287dc515d37bb7bc410e9 on a macOS/ARM64 machine.
(It is not built on a builder with golang.org/x/build/cmd/racebuild
as we don't have darwin/arm64 builder for now.)
Updates #38485.
Change-Id: I391efdacd9480197e308370bfccd05777deb4aee
Reviewed-on: https://go-review.googlesource.com/c/go/+/266373
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
I find it pretty difficult to reason about test-dependency modules
when they aren't in the same file as the rest of the test.
Now that 'go get' supports replacements (CL 258220 and CL 266018),
we can localize tests that need 'go get' but don't specifically depend
on module proxy semantics.
For #36460
For #37438
Change-Id: Ib37a6c170f251435399dfc23e60d96681a81eadc
Reviewed-on: https://go-review.googlesource.com/c/go/+/266369
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This patch changes the way the linker emits the DWARF line table
prologue, specifically the file table. Previously files were left
unmodified, and the directory table was empty. For each compilation
unit we now scan the unit file table and build up a common set of
directories, emit them into the directory table, and then emit file
entries that refer to the dirs. This provides a modest binary size
savings.
For kubernetes kubelet:
$ objdump -h /tmp/kubelet.old | fgrep debug_line
36 .zdebug_line 019a55f5 0000000000000000 0000000000000000 084a5123 2**0
$ objdump -h /tmp/kubelet.new | fgrep debug_line
36 .zdebug_line 01146fd2 0000000000000000 0000000000000000 084a510a 2**0
[where the value following the section name above is the section size
in hex, so roughly a 30% decrease in this case.]
The actual savings will depend on the length of the pathnames
involved, so it's hard to really pin down how much savings we'll see
here. In addition, emitting the files this way reduces the
"compressibility" of the line table, so there could even be cases
where we don't win at all.
Updates #6853, #19784, #36495.
Change-Id: I298d8561da5ed3ebc9d38aa772874851baa2f4f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/263017
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[This is a roll-forward of CL 262319, with a fix for some Darwin test
failures].
Change the definitions of selected runtime assembly routines
from ABI0 (the default) to ABIInternal. The ABIInternal def is
intended to indicate that these functions don't follow the existing Go
runtime ABI. In addition, convert the assembly reference to
runtime.main (from runtime.mainPC) to ABIInternal. Finally, for
functions such as "runtime.duffzero" that are called directly from
generated code, make sure that the compiler looks up the correct
ABI version.
This is intended to support the register abi work, however these
changes should not have any issues even when GOEXPERIMENT=regabi is
not in effect.
Updates #27539, #40724.
Change-Id: Idf507f1c06176073563845239e1a54dad51a9ea9
Reviewed-on: https://go-review.googlesource.com/c/go/+/266638
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In CL 264179, some reorganization of error codes was deferred in order
to minimize diffs between patch-sets.
This CL reorganizes the error codes as discussed. It is a pure
reordering, with no material changes other than the changing of internal
const values.
For #42290
Change-Id: I0e9b421a92e96b19e53039652f8de898c5255290
Reviewed-on: https://go-review.googlesource.com/c/go/+/266637
Run-TryBot: Robert Findley <rfindley@google.com>
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In the current (pre-CL) version of the spec, the 2nd last shift
example appears to be using the array declared in the last example.
On a 32-bit platform, that array would have length 0, which would
lead to a panic in the 2nd last example. Also, if this code were
inside a function, it wouldn't compile (array declared after use).
Use an explicitly declared array for that specific shift example.
Also, split out all cases that produce different results for 32-
vs 64-bit ints.
Fixes#41835.
Change-Id: Ie45114224509e4999197226f91f7f6f934449abb
Reviewed-on: https://go-review.googlesource.com/c/go/+/260398
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
gcBgMarkWorker G's are primarily scheduled by findRunnableGCWorker, but
that no longer needs to be strictly enforced. Temporary preemption to a
runq is fine when the P is not in use.
We still releasem in gopark in the normal case for efficiency: if
gcDrain stops because gp.preempt is set, then gopark would always
preempt. That is fine, but inefficient, since it will reschedule simply
to park again. Thus, we keep releasem in unlockf to skip this extra
cycle.
Change-Id: I6d1a42e3ca41b76227142a6b5bfb376c9213e3c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/262349
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Background mark workers perform per-P marking work. Currently each
worker is assigned a P at creation time. The worker "attaches" to the P
via p.gcBgMarkWorker, making itself (usually) available to
findRunnableGCWorker for scheduling GC work.
While running gcMarkDone, the worker "detaches" from the P (by clearing
p.gcBgMarkWorker), since it may park for other reasons and should not be
scheduled by findRunnableGCWorker.
Unfortunately, this design is complex and difficult to reason about. We
simplify things by changing the design to eliminate the hard P
attachment. Rather than workers always performing work from the same P,
workers perform work for whichever P they find themselves on. On park,
the workers are placed in a pool of free workers, which each P's
findRunnableGCWorker can use to run a worker for its P.
Now if a worker parks in gcMarkDone, a P may simply use another worker
from the pool to complete its own work.
The P's GC worker mode is used to communicate the mode to run to the
selected worker. It is also used to emit the appropriate worker
EvGoStart tracepoint. This is a slight change, as this G may be
preempted (e.g., in gcMarkDone). When it is rescheduled, the trace
viewer will show it as a normal goroutine again. It is currently a bit
difficult to connect to the original worker tracepoint, as the viewer
does not display the goid for the original worker (though the data is in
the trace file).
Change-Id: Id7bd3a364dc18a4d2b1c99c4dc4810fae1293c1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/262348
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Tools using go/types sometimes need to implement special handling for
certain errors produced by the type-checker. They can offer suggested
fixes, expand the error position to surrounding syntax, highlight
related syntax (for example in the case of a declaration cycle), link to
additional documentation, group errors by category, or correlate errors
with signals produced by other static analysis tools.
All these require a notion of error identity. Tools need to be able to
reliably determine the nature of an error without re-implementing type
checking logic or parsing error messages. This CL is a first-pass at
adding such an identifier to types.Error: a (for the moment unexported)
field containing one of many declared errorCode constants.
A wide variety of error code constants are defined, and assigned to type
checker errors according to their 'functional equivalence', meaning that
they should be ideally be stable under refactoring.
With few exceptions, each error code is documented with an example that
produces it. This is enforced by tests.
When error codes are exported they will represent quite a large API
surface. For this reason, as well as the likelihood that error codes
will change at the start, both the code field and the codes themselves
are initially unexported. gopls will read these fields using reflection
during this experimental phase. Others can obviously do the same,
provided they accept the lack of forward compatibility.
For #42290
Change-Id: I15e3c2bffd2046c20297b1857057d421f633098a
Reviewed-on: https://go-review.googlesource.com/c/go/+/264179
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Currently, on all supported platforms, the race detector (LLVM
TSAN) expects the Go heap is at 0xc000000000 - 0xe000000000.
Move the raceenabled condition first, so we always allocate
there.
This means on Linux/ARM64 when race detector is on we will
allocate to 0xc000000000 - 0xe000000000, instead of 0x4000000000.
The old address is meant for 39-bit VMA. But the race detector
only supports 48-bit VMA anyway. So this is fine.
Change-Id: I51ac8eff68297b37c8c651a93145cc94f83a939d
Reviewed-on: https://go-review.googlesource.com/c/go/+/266372
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
A method selector expression can pick out a method or promoted method
(represented by ODOTMETH), but it can also pick out an interface
method from an embedded interface-typed field (represented by
ODOTINTER).
In the case that we're picking out an interface method, we're not able
to fully devirtualize the method call. However, we're still able to
improve escape analysis somewhat. E.g., the included test case
demonstrates that we can optimize "i.M()" to "i.(T).I.M()", which
means the T literal can be stack allocated instead of heap allocated.
Fixes#42279.
Change-Id: Ifa21d19011e2f008d84f9624b7055b4676b6d188
Reviewed-on: https://go-review.googlesource.com/c/go/+/266300
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In ParseComplex, the "size" passed to parseFloatPrefix should be 64 for
complex128, not 128. It still works because of how parseFloatPrefix
is forgiving about the size if it's not 32, but worth fixing anyway.
Make ParseComplex and ParseFloat return a bit size error for anything
other than 128 or 64 (for ParseComplex), or 64 or 32 (for ParseFloat).
Add "InvalidBitSize" tests for these cases.
Add tests for ParseComplex with bitSize==64: this is done in a similar
way to how the ParseFloat 32-bit tests work, re-using the tests for the
larger bit size.
Add tests for FormatComplex -- there were none before.
Fixes#40706
Change-Id: I16ddd546e5237207cc3b8c2181dd708eca42b04f
Reviewed-on: https://go-review.googlesource.com/c/go/+/248219
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There is no documentation on a number of methods of the strings.Reader
struct, so this change adds documentation referring to the relevant
io.* interfaces implemented. This is consistent with pre-existing
documentation in this struct.
Fixes#40381
Change-Id: I3dec65ecafca5b79d85d30a676d297e5ee9ab47e
GitHub-Last-Rev: f42429946a
GitHub-Pull-Request: golang/go#40654
Reviewed-on: https://go-review.googlesource.com/c/go/+/247523
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Append operations in the decimal String function may cause several allocations.
Use make to pre allocate slices in String that have enough capacity to avoid additional allocations in append operations.
name old time/op new time/op delta
DecimalConversion-8 139µs ± 7% 109µs ± 2% -21.06% (p=0.000 n=10+10)
Change-Id: Id0284d204918a179a0421c51c35d86a3408e1bd9
Reviewed-on: https://go-review.googlesource.com/c/go/+/233980
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Trust: Martin Möhrmann <moehrmann@google.com>
In many cases, it is not necessary to parse long
decimal mantissas entirely to produce the correctly
rounded floating-point number. It is enough to parse
the short, rounded lower and upper bounds and in most cases
they round to the same floating point number because uint64
can hold 19 digits.
Previously this case was handled by the extFloat code path
(Grisu3 algorithm).
name old time/op new time/op delta
Atof64Big-4 1.07µs ± 2% 0.11µs ± 2% -89.61% (p=0.000 n=10+9)
Atof64RandomLongFloats-4 8.03µs ± 2% 0.14µs ± 7% -98.24% (p=0.000 n=10+10)
Atof32RandomLong-4 760ns ± 1% 156ns ± 0% -79.46% (p=0.000 n=10+8)
Benchmarks versus extFloat:
name old time/op new time/op delta
Atof64Big-4 121ns ± 3% 111ns ± 2% -7.93% (p=0.000 n=10+9)
Atof64RandomLongFloats-4 144ns ± 1% 142ns ± 7% ~ (p=0.167 n=10+10)
Atof32RandomLong-4 129ns ± 1% 156ns ± 0% +21.12% (p=0.000 n=10+8)
Change-Id: Id734b8c11e74b49a444fda67ee72870ae9422e60
Reviewed-on: https://go-review.googlesource.com/c/go/+/264677
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We don't put Go static symbols in the symbol table, as they are
always compiler-generated (there is no way to define a static
symbol in user code in Go). We retain static symbols in assembly
code, as it may be user-defined. Also retain static symbols in C.
This is the second attempt of CL 263259, which was reverted
because it broke AIX tests in that it brought TOC.stmp symbols
in the symbol table. This time we use SymPkg(s) == "" to identify
non-Go symbols, instead of IsExternal(s), as the latter also
includes linker-modified Go symbols.
Change-Id: I5c752c54f0fc6ac4cde6a0e8161dac5b72a47d56
Reviewed-on: https://go-review.googlesource.com/c/go/+/266237
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
These messages can happen if there are
duplicate body-less function declarations.
Using panic gives the panic handler
a chance to handle the panic by printing the
queued error messages instead of an internal error.
And if there are no queued error messages,
using panic pinpoints the stack trace leading
to the incorrect use of NewFuncInfo/NewFileInfo.
Change-Id: I7e7ea9822ff9a1e7140f5e5b7cfd6437ff9318a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/266338
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
We should still be able to devirtualize here, but I need to understand
the AST better. While I'm doing that, at least switch to a graceful
failure case (i.e., skip the optimization and print a warning message)
to fix the x/text builders.
Updates #42279.
Change-Id: Ie2b0b701fccf590d0cabfead703fc2fa999072cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/266359
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
After inlining, add a pass that looks for interface calls where we can
statically determine the interface value's concrete type. If such a
case is found, insert an explicit type assertion to the concrete type
so that escape analysis can see it.
Fixes#33160.
Change-Id: I36932c691693f0069e34384086d63133e249b06b
Reviewed-on: https://go-review.googlesource.com/c/go/+/264837
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
When inlining a function call "f()", if "f" contains exactly 1
"return" statement and doesn't name its result parameters, it's
inlined to declare+initialize the result value using the AST
representation that's compatible with staticValue.
Also, extend staticValue to skip over OCONVNOP nodes (often introduced
by inlining), and fix various bits of code related to handling method
expressions.
Updates #33160.
Change-Id: If8652e319f0a5700cf9d40a7a62e369a2a359229
Reviewed-on: https://go-review.googlesource.com/c/go/+/266199
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: David Chase <drchase@google.com>
This reverts CL 263457.
It turns out that this still missed changes to cmd/link/internal/ld/config.go
and some of these build modes also fail once cgo is enabled. Disable again for
now.
Change-Id: Iaf40d44e1551afd5b040d357f04af134f55a64a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/266317
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Joel Sing <joel@sing.id.au>
This change fixes two failng tests on linux-ppc64x:
- TestAllThreadsSyscall() exposed a real bug in the ppc64x support:
- It turns out that the r2 syscall return value is not defined
on all architectures. Notably linux-ppc64x so address that by
introducing a private architectural constant in the syscall
package, archHonorsR2: true if r2 has a determanistic value.
- TestSetuidEtc() was sensitive to /proc/<PID>/status content:
- The amount of padding space has changed with kernel vintage.
- Stress testing revealed a race with /proc files disappearing.
Fixes#42178
Change-Id: Ie6fc0b8f2f94a409ac0e5756e73bfce113274709
Reviewed-on: https://go-review.googlesource.com/c/go/+/266202
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
The inlining pass previously bailed upon encountering a go or defer statement, so it would not inline functions e.g. used to provide arguments to the deferred function. This change preserves the behavior of not inlining the
deferred function itself, but it allows the inlining walk to proceed into its arguments.
Fixes#42194
Change-Id: I4e82029d8dcbe69019cc83ae63a4b29af45ec777
Reviewed-on: https://go-review.googlesource.com/c/go/+/264997
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
The final piece of //go:embed support: have the go command stitch
together parsing in go/build, low-level data initialization in cmd/compile,
and the new data structures in package embed, to make the //go:embed
feature actually function.
And test, now that all the pieces are available to work together.
For #41191.
(Issue not fixed: still need to add a tool for use by Bazel.)
Change-Id: Ib1d198345c3b4d557d340f292eda13b984b65d65
Reviewed-on: https://go-review.googlesource.com/c/go/+/243945
Trust: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Trust: Johan Brandhorst <johan.brandhorst@gmail.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Johan Brandhorst <johan.brandhorst@gmail.com>
This reverts CL 250497. It also moves all blank identifier imports below the rest of the imports for clarity.
Reason for revert: The blank identifier import was intentional to show that it's needed for its registration side effect. The duplicate import should stay since it communicates that the side-effect is important to tools and to future developers updating this file.
Change-Id: I626e6329db50f47453aa71085a05d21bf6efe0ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/265078
Run-TryBot: Katie Hockman <katie@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Change the definitions of selected runtime assembly routines
from ABI0 (the default) to ABIInternal. The ABIInternal def is
intended to indicate that these functions don't follow the existing Go
runtime ABI. In addition, convert the assembly reference to
runtime.main (from runtime.mainPC) to ABIInternal. Finally, for
functions such as "runtime.duffzero" that are called directly from
generated code, make sure that the compiler looks up the correct
ABI version.
This is intended to support the register abi work, however these
changes should not have any issues even when GOEXPERIMENT=regabi is
not in effect.
Updates #27539, #40724.
Change-Id: I9846f8dcaccc95718cf2e61a18b7e924a0677e4c
Reviewed-on: https://go-review.googlesource.com/c/go/+/262319
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This patch adds support for CASx and CASPx atomic instructions.
go syntax gnu syntax
CASD Rs, (Rn|RSP), Rt => cas Xs, Xt, (Xn|SP)
CASALW Rs, (Rn|RSP), Rt => casal Ws, Wt, (Xn|SP)
CASPD (Rs, Rs+1), (Rn|RSP), (Rt, Rt+1) => casp Xs, Xs+1, Xt, Xt+1, (Xn|SP)
CASPW (Rs, Rs+1), (Rn|RSP), (Rt, Rt+1) => casp Ws, Ws+1, Wt, Wt+1, (Xn|SP)
This patch changes the type of prog.RestArgs from "[]Addr" to
"[]struct{Addr, Pos}", Pos is a enum, indicating the position of
the operand.
This patch also adds test cases.
Change-Id: Ib971cfda7890b7aa895d17bab22dea326c7fcaa4
Reviewed-on: https://go-review.googlesource.com/c/go/+/233277
Trust: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This patch enables VSLI, VUADDW(2), VUSRA and FMOVQ SIMD instructions
required by the issue #40725. And the GNU syntax of 'FMOVQ' is 128-bit
ldr/str(immediate, simd&fp).
Add test cases.
Fixes#40725
Change-Id: Ide968ef4a9385ce4cd8f69bce854289014d30456
Reviewed-on: https://go-review.googlesource.com/c/go/+/258397
Trust: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
As it says, delay expanpsion of OpArg to the expand_calls phase,
to enable (eventually) interprocedural SSA optimizations, and
(sooner) change to a register ABI.
Includes a round of cleanup to function names and comments,
largely to match the expanded scope of the functions.
This CL removes the per-function dependence on GOSSAHASH,
but the go116lateCallExpansion kill switch remains (and was
tested locally to ensure it worked).
Two functions in expand_calls.go that performed overlapping
things were combined into a single function that is called
twice.
Fixes#42236.
For #40724.
Change-Id: Icbb78947eaa39f17f2c1210d5c2caef20abd6571
Reviewed-on: https://go-review.googlesource.com/c/go/+/262117
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Some of the current functions for encoding load/store with
immediate offset instructions, like opstr12(), opstr9(),
opldr12(), opldr9() and opldrpp(), etc., they have the same
code, so this patch refactors them and merges them into two
functions opstr() and opldr().
Change-Id: I60367f8b720b77c7ebe6d66905a950dcf7701836
Reviewed-on: https://go-review.googlesource.com/c/go/+/263479
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: fannie zhang <Fannie.Zhang@arm.com>
This is done by decomposing the number to be divided in 32-bit
components and using the 32-bit magic multiply. For the lowering to be
effective the constant must fit in 16 bits.
On ARM the expression n / 5 compiles to 25 instructions.
Benchmark for GOARCH=arm (Cortex-A53)
name old time/op new time/op delta
DivconstU64/3-6 1.19µs ± 0% 0.03µs ± 1% -97.40% (p=0.000 n=9+9)
DivconstU64/5-6 1.18µs ± 1% 0.03µs ± 1% -97.38% (p=0.000 n=10+8)
DivconstU64/37-6 1.13µs ± 1% 0.04µs ± 1% -96.51% (p=0.000 n=10+8)
DivconstU64/1234567-6 852ns ± 0% 901ns ± 1% +5.73% (p=0.000 n=8+9)
Benchmark for GOARCH=386 (Haswell)
name old time/op new time/op delta
DivconstU64/3-4 18.0ns ± 2% 5.6ns ± 1% -69.06% (p=0.000 n=10+10)
DivconstU64/5-4 17.8ns ± 1% 5.5ns ± 1% -68.87% (p=0.000 n=9+10)
DivconstU64/37-4 17.8ns ± 1% 7.3ns ± 0% -58.90% (p=0.000 n=10+10)
DivconstU64/1234567-4 17.5ns ± 1% 16.0ns ± 0% -8.55% (p=0.000 n=10+9)
Change-Id: I38a19b4d59093ec021ef2e5241364a3dad4eae73
Reviewed-on: https://go-review.googlesource.com/c/go/+/264683
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
rewrite.go has two identical functions log2 and log64; the former has
been there for a while, while the latter was added together with
log{8,16,32} for use in typed rules.
This change deletes log2 and switches to using log64 everywhere.
Change-Id: I759b878814e4c115a5fa470274f22477738d69ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/265457
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Following golang.org/cl/259578, findrunnable still must touch every
other P in checkTimers in order to look for timers to steal. This scales
poorly with GOMAXPROCS and potentially performs poorly by pulling remote
Ps into cache.
Add timerpMask, a bitmask that tracks whether each P may have any timers
on its timer heap.
Ideally we would update this field on any timer add / remove to always
keep it up to date. Unfortunately, updating a shared global structure is
antithetical to sharding timers by P, and doing so approximately doubles
the cost of addtimer / deltimer in microbenchmarks.
Instead we only (potentially) clear the mask when the P goes idle. This
covers the best case of avoiding looking at a P _at all_ when it is idle
and has no timers. See the comment on updateTimerPMask for more details
on the trade-off. Future CLs may be able to expand cases we can avoid
looking at the timers.
Note that the addition of idlepMask to p.init is a no-op. The zero value
of the mask is the correct init value so it is not necessary, but it is
included for clarity.
Benchmark results from WakeupParallel/syscall/pair/race/1ms (see
golang.org/cl/228577). Note that these are on top of golang.org/cl/259578:
name old msec new msec delta
Perf-task-clock-8 244 ± 4% 246 ± 4% ~ (p=0.841 n=5+5)
Perf-task-clock-16 247 ±11% 252 ± 4% ~ (p=1.000 n=5+5)
Perf-task-clock-32 270 ± 1% 268 ± 2% ~ (p=0.548 n=5+5)
Perf-task-clock-64 302 ± 3% 296 ± 1% ~ (p=0.222 n=5+5)
Perf-task-clock-128 358 ± 3% 352 ± 2% ~ (p=0.310 n=5+5)
Perf-task-clock-256 483 ± 3% 458 ± 1% -5.16% (p=0.008 n=5+5)
Perf-task-clock-512 663 ± 1% 612 ± 4% -7.61% (p=0.008 n=5+5)
Perf-task-clock-1024 1.06k ± 1% 0.95k ± 2% -10.24% (p=0.008 n=5+5)
Updates #28808
Updates #18237
Change-Id: I4239cd89f21ad16dfbbef58d81981da48acd0605
Reviewed-on: https://go-review.googlesource.com/c/go/+/264477
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
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Trust: Michael Pratt <mpratt@google.com>
procfs(5) is not always mounted in DragonFly BSD, for example during
the binary package build with synth. os.Executable() consumers
will then fail, we've spotted this when trying to build tinygo:
[...]
copying source files
./build/tinygo build-builtins -target=armv6m-none-eabi [...]
panic: could not get executable path: readlink /proc/curproc/file:
no such file or directory
[...]
Use KERN_PROC_PATHNAME as FreeBSD does.
Change-Id: Ic65bea02cd0309fb24dec8ba8d2b151d1acde67b
GitHub-Last-Rev: 083120a43b
GitHub-Pull-Request: golang/go#36826
Reviewed-on: https://go-review.googlesource.com/c/go/+/216622
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
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Trust: Brad Fitzpatrick <bradfitz@golang.org>
Tx acquires tx.closemu W-lock and then acquires stmt.closemu.W-lock
to fully close the transaction and associated prepared statement.
Stmt query and execution run in reverse ways - acquires
stmt.closemu.R-lock and then acquires tx.closemu.R-lock to grab tx
connection, which may cause deadlock.
Prevent the lock is held around tx.closePrepared to ensure no
deadlock happens.
Fixes#40985
Change-Id: If53909822b87bce11861a6e3035ecb9476d2cd17
Reviewed-on: https://go-review.googlesource.com/c/go/+/250178
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Follow-up for CL 265819.
Given the -pre tag added recently, a new stable version is likely
tagged soon. This would break TestCodeRepoVersions on the longtest
builders again. Since the other test cases in codeRepoVersionsTests
already provide enough coverage, drop gopkg.in/russross/blackfriday.v2
to avoid breaking TestCodeRepoVersions once the release happens.
Updates #28856
Change-Id: If86a637b5e47f59faf9048fc1cbbae6e8f1dcc53
Reviewed-on: https://go-review.googlesource.com/c/go/+/265917
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Sysmon can actually get the RW lock execLock while holding the sysmon
lock (if no M is available), so there is an edge from lockRankSysmon to
lockRankRwmutexR. The stack trace is sysmon() [gets sched.sysmonlock] ->
startm() -> newm() -> newm1() -> execLock.runlock() [gets
execLock.rLock]
Change-Id: I9658659ba3899afb5219114d66b989abd50540db
Reviewed-on: https://go-review.googlesource.com/c/go/+/265721
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
With previous CLs, internal linking without cgo should work well.
Enable it by default. And stop always requiring cgo.
Enable tests that were previously disabled due to the lack of
internal linking.
Updates #38485.
Change-Id: I45125b9c263fd21d6847aa6b14ecaea3a2989b29
Reviewed-on: https://go-review.googlesource.com/c/go/+/265121
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, on darwin/arm64 we set up TLS using cgo. TLS is not
set for pure Go programs. As we use libc for syscalls on darwin,
we need to save the G register before the libc call. Otherwise it
is not signal-safe, as a signal may land during the execution of
a libc function, where the G register may be clobbered.
This CL initializes TLS in Go, by calling the pthread functions
directly without cgo. This makes it possible to save the G
register to TLS in pure Go programs (done in a later CL).
Inspired by Elias's CL 209197. Write the logic in Go instead of
assembly.
Updates #38485, #35853.
Change-Id: I257ba2a411ad387b2f4d50d10129d37fec7a226e
Reviewed-on: https://go-review.googlesource.com/c/go/+/265118
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Elias Naur <mail@eliasnaur.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The extend information of a time zone file with last transition < now
could result in a wrong cached zone because it used the zone of the
last transition.
This could lead to wrong zones in systems with slim zoneinfo.
Fixes#42216
Change-Id: I7c57c35b5cfa58482ac7925b5d86618c52f5444d
Reviewed-on: https://go-review.googlesource.com/c/go/+/264939
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Some programs have a lot of timers that they adjust both forward and
backward in time. This can cause a large number of timerModifiedEarlier
timers. In practice these timers are used for I/O deadlines and are
rarely reached. The effect is that the runtime spends a lot of time
in adjusttimers making sure that there are no timerModifiedEarlier
timers, but the effort is wasted because none of the adjusted timers
are near the top of the timer heap anyhow.
Avoid much of this extra work by keeping track of the earliest known
timerModifiedEarlier timer. This lets us skip adjusttimers if we know
that none of the timers will be ready to run anyhow. We will still
eventually run it, when we reach the deadline of the earliest known
timerModifiedEarlier, although in practice that timer has likely
been removed. When we do run adjusttimers, we will reset all of the
timerModifiedEarlier timers, and clear our notion of when we need
to run adjusttimers again.
This effect should be to significantly reduce the number of times we
walk through the timer list in adjusttimers.
Fixes#41699
Change-Id: I38eb2be611fb34e3017bb33d0a9ed40d75fb414f
Reviewed-on: https://go-review.googlesource.com/c/go/+/258303
Trust: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Pretty minor concern, but after auditing the compiler/runtime for
conversions from pointers to go:notinheap types to unsafe.Pointer,
this is the only remaining one I found.
Update #42076
Change-Id: I81d5b893c9ada2fc19a51c2559262f2e9ff71c35
Reviewed-on: https://go-review.googlesource.com/c/go/+/265757
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
pointers to go:notinheap types should be treated as scalars. That
means they shouldn't be stored directly in interfaces, or directly
in reflect.Value.ptr.
Also be sure to use uintpr to compare such pointers in reflect.DeepEqual.
Fixes#42076
Change-Id: I53735f6d434e9c3108d4940bd1bae14c61ef2a74
Reviewed-on: https://go-review.googlesource.com/c/go/+/264480
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
storeType splits compound stores up into a scalar parts and a pointer parts.
The scalar part happens unconditionally, and the pointer part happens
under the guard of a write barrier check.
Types which are declared as pointers, but are represented as scalars because
they might have "bad" values, were not handled correctly here. They ended
up not getting stored in either set.
Fixes#42032
Change-Id: I46f6600075c0c370e640b807066247237f93c7ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/264300
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
rewrite.go has two identical functions isPowerOfTwo and
isPowerOfTwo64; the former has been there for a while, while the
latter was added together with isPowerOfTwo{8,16,32} for use in typed
rules.
This change deletes isPowerOfTwo and switch to using isPowerOfTwo64
everywhere.
Change-Id: If26c94565d2393fac6f0ba117ee7ee2fc915f7cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/265417
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Changes:
- makeValAndOff is deleted in favour of MakeValAndOff{32,64}
- canAdd is renamed to canAdd64 to uniform with existing canAdd32
- addOffset{32,64} is simplified by directly using MakeValAndOff{32,64}
- ValAndOff.Int64 is removed
Change-Id: Ic01db7fa31ddfe0aaaf1d1d77af823d48a7bee84
Reviewed-on: https://go-review.googlesource.com/c/go/+/265357
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Instead of always polling 500ms, start with an interval of 1ms and
exponentially back off to at most 500ms. 10% jitter is added to each
interval.
This makes Shutdown more responsive when connections and listeners
close quickly.
Also removes the need for the polling interval to be changed in tests
since if tests' connections and listeners close quickly Shutdown will
also return quickly.
Fixes#42156
Change-Id: I5e59844a2980c09adebff57ae8b58817965e6db4
Reviewed-on: https://go-review.googlesource.com/c/go/+/264479
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Bryan C. Mills <bcmills@google.com>
Combine (AND m (SRWconst x)) or (SRWconst (AND m x)) when mask m is
and the shift value produce constant which can be encoded into an
RLWINM instruction.
Combine (CLRLSLDI (SRWconst x)) if the combining of the underling rotate
masks produces a constant which can be encoded into RLWINM.
Likewise for (SLDconst (SRWconst x)) and (CLRLSDI (RLWINM x)).
Combine rotate word + and operations which can be encoded as a single
RLWINM/RLWNM instruction.
The most notable performance improvements arise from the crypto
benchmarks below (GOARCH=power8 on a ppc64le/linux):
pkg:golang.org/x/crypto/blowfish goos:linux goarch:ppc64le
ExpandKeyWithSalt 52.2µs ± 0% 47.5µs ± 0% -8.88%
ExpandKey 44.4µs ± 0% 40.3µs ± 0% -9.15%
pkg:golang.org/x/crypto/ssh/internal/bcrypt_pbkdf goos:linux goarch:ppc64le
Key 57.6ms ± 0% 52.3ms ± 0% -9.13%
pkg:golang.org/x/crypto/bcrypt goos:linux goarch:ppc64le
Equal 90.9ms ± 0% 82.6ms ± 0% -9.13%
DefaultCost 91.0ms ± 0% 82.7ms ± 0% -9.12%
Change-Id: I59a0ca29face38f4ab46e37124c32906f216c4ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/260798
Run-TryBot: Carlos Eduardo Seo <carlos.seo@linaro.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@linaro.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Change the scheduler to treat expired timers with the same approach it
uses to steal runnable G's.
Previously the scheduler ignored timers on P's not marked for
preemption. That had the downside that any G's waiting on those expired
timers starved until the G running on their P completed or was
preempted. That could take as long as 20ms if sysmon was in a 10ms
wake up cycle.
In addition, a spinning P that ignored an expired timer and found no
other work would stop despite there being available work, missing the
opportunity for greater parallelism.
With this change the scheduler no longer ignores timers on
non-preemptable P's or relies on sysmon as a backstop to start threads
when timers expire. Instead it wakes an idle P, if needed, when
creating a new timer because it cannot predict if the current P will
have a scheduling opportunity before the new timer expires. The P it
wakes will determine how long to sleep and block on the netpoller for
the required time, potentially stealing the new timer when it wakes.
This change also eliminates a race between a spinning P transitioning
to idle concurrently with timer creation using the same pattern used
for submission of new goroutines in the same window.
Benchmark analysis:
CL 232199, which was included in Go 1.15 improved timer latency over Go
1.14 by allowing P's to steal timers from P's not marked for preemption.
The benchmarks added in this CL measure that improvement in the
ParallelTimerLatency benchmark seen below. However, Go 1.15 still relies
on sysmon to notice expired timers in some situations and sysmon can
sleep for up to 10ms before waking to check timers. This CL fixes that
shortcoming with modest regression on other benchmarks.
name \ avg-late-ns go14.time.bench go15.time.bench fix.time.bench
ParallelTimerLatency-8 17.3M ± 3% 7.9M ± 0% 0.2M ± 3%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-8 53.4k ±23% 50.7k ±31% 252.4k ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-8 204k ±14% 90k ±58% 188k ±12%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-8 1.17M ± 0% 0.11M ± 5% 0.11M ± 2%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-8 1.81M ±44% 0.10M ± 4% 0.10M ± 2%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-8 2.28M ±66% 0.09M ±13% 0.08M ±21%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-8 2.84M ±85% 0.07M ±15% 0.07M ±18%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-8 2.13M ±27% 0.06M ± 4% 0.06M ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-8 2.63M ± 6% 0.06M ±11% 0.06M ± 9%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-8 3.32M ±17% 0.06M ±16% 0.07M ±14%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-8 8.46M ±20% 4.37M ±21% 5.03M ±23%
StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-8 1.02M ± 1% 0.20M ± 2% 0.20M ± 2%
name \ max-late-ns go14.time.bench go15.time.bench fix.time.bench
ParallelTimerLatency-8 18.3M ± 1% 8.2M ± 0% 0.5M ±12%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=1-8 141k ±19% 127k ±19% 1129k ± 3%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=2-8 2.78M ± 4% 1.23M ±15% 1.26M ± 5%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=3-8 6.05M ± 5% 0.67M ±56% 0.81M ±33%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=4-8 7.93M ±20% 0.71M ±46% 0.76M ±41%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=5-8 9.41M ±30% 0.92M ±23% 0.81M ±44%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=6-8 10.8M ±42% 0.8M ±41% 0.8M ±30%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=7-8 9.62M ±24% 0.77M ±38% 0.88M ±27%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=8-8 10.6M ±10% 0.8M ±32% 0.7M ±27%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=9-8 11.9M ±36% 0.6M ±46% 0.8M ±38%
StaggeredTickerLatency/work-dur=300µs/tickers-per-P=10-8 36.8M ±21% 24.7M ±21% 27.5M ±16%
StaggeredTickerLatency/work-dur=2ms/tickers-per-P=1-8 2.12M ± 2% 1.02M ±11% 1.03M ± 7%
Other time benchmarks:
name \ time/op go14.time.bench go15.time.bench fix.time.bench
AfterFunc-8 137µs ± 4% 123µs ± 4% 131µs ± 2%
After-8 212µs ± 3% 195µs ± 4% 204µs ± 7%
Stop-8 165µs ± 6% 156µs ± 2% 151µs ±12%
SimultaneousAfterFunc-8 260µs ± 3% 248µs ± 3% 284µs ± 2%
StartStop-8 65.8µs ± 9% 64.4µs ± 7% 67.3µs ±15%
Reset-8 13.6µs ± 2% 9.6µs ± 2% 9.1µs ± 4%
Sleep-8 307µs ± 4% 306µs ± 3% 320µs ± 2%
Ticker-8 53.0µs ± 5% 54.5µs ± 5% 57.0µs ±11%
TickerReset-8 9.24µs ± 2% 9.51µs ± 3%
TickerResetNaive-8 149µs ± 5% 145µs ± 5%
Fixes#38860
Updates #25471
Updates #27707
Change-Id: If52680509b0f3b66dbd1d0c13fa574bd2d0bbd57
Reviewed-on: https://go-review.googlesource.com/c/go/+/232298
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Ian Lance Taylor <iant@golang.org>
misc/cgo/test fails in 'dist test' on arm64 if the C compiler is of GCC-9.4 or
above and its 'outline atomics' feature is enabled, since the internal linking
hasn't yet supported "__attribute__((constructor))" and also mis-handles hidden
visibility.
This change addresses the problem by skipping the internal linking cases of
misc/cgo/test on linux/arm64. It fixes 'dist test' failure only, user is expected to
pass a GCC option '-mno-outline-atomics' via CGO_CFLAGS if running into the same
problem when building cgo programs using internal linking.
Updates #39466
Change-Id: I57f9e85fca881e5fd2dae6c1b4446bce9e0c1975
Reviewed-on: https://go-review.googlesource.com/c/go/+/262357
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Previously, 2 goroutines were created in OpenDB and a comment in the DB.close() field indicated that they were canceled. Later, session Resetter () was removed, but the comment remained the same. This commit just fixes this message
Change-Id: Ie81026f51d7770e9cf8004818154021f626fb2e8
GitHub-Last-Rev: 38b338a0d1
GitHub-Pull-Request: golang/go#42191
Reviewed-on: https://go-review.googlesource.com/c/go/+/264838
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Add additional rules to eliminate unnecessary sign/zero extension for riscv64.
Also where possible, replace an extension following a load with a different typed
load. This removes almost another 8,000 instructions from the go binary.
Of particular note, change Eq16/Eq8/Neq16/Neq8 to zero extend each value before
subtraction, rather than zero extending after subtraction. While this appears to
double the number of zero extensions, it often lets us completely eliminate them
as the load can already be performed in a properly typed manner.
As an example, prior to this change runtime.memequal16 was:
0000000000013028 <runtime.memequal16>:
13028: 00813183 ld gp,8(sp)
1302c: 00019183 lh gp,0(gp)
13030: 01013283 ld t0,16(sp)
13034: 00029283 lh t0,0(t0)
13038: 405181b3 sub gp,gp,t0
1303c: 03019193 slli gp,gp,0x30
13040: 0301d193 srli gp,gp,0x30
13044: 0011b193 seqz gp,gp
13048: 00310c23 sb gp,24(sp)
1304c: 00008067 ret
Whereas it now becomes:
0000000000012fa8 <runtime.memequal16>:
12fa8: 00813183 ld gp,8(sp)
12fac: 0001d183 lhu gp,0(gp)
12fb0: 01013283 ld t0,16(sp)
12fb4: 0002d283 lhu t0,0(t0)
12fb8: 405181b3 sub gp,gp,t0
12fbc: 0011b193 seqz gp,gp
12fc0: 00310c23 sb gp,24(sp)
12fc4: 00008067 ret
Change-Id: I16321feb18381241cab121c0097a126104c56c2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/264659
Trust: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
CryptGenRandom appears to be unfavorable these days, whereas the classic
RtlGenRandom is still going strong.
This commit also moves the warnBlocked function into rand_unix, rather
than rand, because it's now only used on unix.
Fixes#33542
Change-Id: I5c02a5917572f54079d627972401efb6e1ce4057
Reviewed-on: https://go-review.googlesource.com/c/go/+/210057
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Rather than handling sign and zero extension via rules, defer to the assembler
and use MOV pseudo-instructions. The instruction can also be omitted where the
type and size is already correct. This change results in more than 6,000
instructions being removed from the go binary (in part due to omitted
instructions, in part due to MOVBU having a more efficient implementation in
the assembler than what is used in the current ZeroExt8to{16,32,64} rules).
This will also allow for further rewriting to remove redundant sign/zero
extension.
Change-Id: I05e42fd9f09f40a69948be7de772cce8946c8744
Reviewed-on: https://go-review.googlesource.com/c/go/+/264658
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Instead of duplicating PackageOpts fields in the loaderParams struct,
embed the PackageOpts directly. Many of the fields are duplicated, and
further fields that would also be duplicated will be added in
subsequent changes.
For #36460
Change-Id: I3b0770d162e901d23ec1643183eb07c413d51e0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/263138
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Currently, "x &^ y" gets rewriten into "x & ^y" during walk. It adds
unnecessary complexity to other parts, which must aware about this.
Instead, we can just implement "&^" in the conversion to SSA, so "&^"
can be handled like other binary operators.
However, this CL does not pass toolstash-check. It seems that implements
"&^" in the conversion to SSA causes registers allocation change.
With the parent:
obj: 00212 (.../src/runtime/complex.go:47) MOVQ X0, AX
obj: 00213 (.../src/runtime/complex.go:47) BTRQ $63, AX
obj: 00214 (.../src/runtime/complex.go:47) MOVQ "".n(SP), CX
obj: 00215 (.../src/runtime/complex.go:47) MOVQ $-9223372036854775808, DX
obj: 00216 (.../src/runtime/complex.go:47) ANDQ DX, CX
obj: 00217 (.../src/runtime/complex.go:47) ORQ AX, CX
With this CL:
obj: 00212 (.../src/runtime/complex.go:47) MOVQ X0, AX
obj: 00213 (.../src/runtime/complex.go:47) BTRQ $63, AX
obj: 00214 (.../src/runtime/complex.go:47) MOVQ $-9223372036854775808, CX
obj: 00215 (.../src/runtime/complex.go:47) MOVQ "".n(SP), DX
obj: 00216 (.../src/runtime/complex.go:47) ANDQ CX, DX
obj: 00217 (.../src/runtime/complex.go:47) ORQ AX, DX
Change-Id: I80acf8496a91be4804fb7ef3df04c19baae2754c
Reviewed-on: https://go-review.googlesource.com/c/go/+/264660
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This change modifies addrRanges.findSucc to more efficiently find the
successor range in an addrRanges by using a binary search to narrow down
large addrRanges and iterate over no more than 8 addrRanges.
This change makes the runtime more robust against systems that may
aggressively randomize the address space mappings it gives the runtime
(e.g. Fuchsia).
For #40191.
Change-Id: If529df2abd2edb1b1496d8690ddd284ecd7138c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/242679
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Since MemStats is now populated directly and some values are derived,
avoid duplicating the logic by instead populating the heap dump directly
from MemStats (external version) instead of memstats (runtime internal
version).
Change-Id: I0bec96bfa02d2ffd1b56475779c124a760e64238
Reviewed-on: https://go-review.googlesource.com/c/go/+/255817
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
CL 253748 introduced a special case in cmd/go to allow sync to import
runtime/internal/atomic. Besides introducing unnecessary complexity
into cmd/go, this breaks other packages (like gopls) that understand
how imports work, but don't understand this special case.
Fix this by using the more standard linkname-based approach to pull
the necessary functions from runtime/internal/atomic into sync. Since
these are compiler intrinsics, we also have to tell the compiler that
the linknamed symbols are intrinsics to get this optimization in sync.
Fixes#42196.
Change-Id: I1f91498c255c91583950886a89c3c9adc39a32f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/265124
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
When a function with non-zero frame size makes a return jump
(RET target), it assembles to, conceptually,
MOV (SP), LR
ADD $framesize, SP
JMP target
We did not clear some fields in the first instruction's Prog.To,
causing it printed like (on ARM)
MOVW.P 4(R13), (R14)(R14)(REG)
Clear the fields to make it print nicer.
Change-Id: I180901aeea41f1ff287d7c6034a6d69005927744
Reviewed-on: https://go-review.googlesource.com/c/go/+/264343
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
This change adds a new benchmark to the runtime tests for measuring the
latency of the new metrics implementation, based on the
ReadMemStats latency benchmark. readMetrics will have more metrics added
to it in the future, and this benchmark will serve as a way to measure
the cost of adding additional metrics.
Change-Id: Ib05e3ed4afa49a70863fc0c418eab35b72263e24
Reviewed-on: https://go-review.googlesource.com/c/go/+/247042
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change adds support for a variety of runtime memory metrics and
contains the base implementation of Read for the runtime/metrics
package, which lives in the runtime.
It also adds testing infrastructure for the metrics package, and a bunch
of format and documentation tests.
For #37112.
Change-Id: I16a2c4781eeeb2de0abcb045c15105f1210e2d8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/247041
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
This change moves the mcache-local malloc stats into the
consistentHeapStats structure so the malloc stats can be managed
consistently with the memory stats. The one exception here is
tinyAllocs for which moving that into the global stats would incur
several atomic writes on the fast path. Microbenchmarks for just one CPU
core have shown a 50% loss in throughput. Since tiny allocation counnt
isn't exposed anyway and is always blindly added to both allocs and
frees, let that stay inconsistent and flush the tiny allocation count
every so often.
Change-Id: I2a4b75f209c0e659b9c0db081a3287bf227c10ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/247039
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change replaces stacks_inuse, gcWorkBufInUse and
gcProgPtrScalarBitsInUse with their corresponding consistent stats. It
also adds checks to make sure the rest of the sharded stats line up with
existing stats in updatememstats.
Change-Id: I17d0bd181aedb5c55e09c8dff18cef5b2a3a14e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/247038
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change adds a global set of heap statistics which are similar
to existing memory statistics. The purpose of these new statistics
is to be able to read them and get a consistent result without stopping
the world. The goal is to eventually replace as many of the existing
memstats statistics with the sharded ones as possible.
The consistent memory statistics use a tailor-made synchronization
mechanism to allow writers (allocators) to proceed with minimal
synchronization by using a sequence counter and a global generation
counter to determine which set of statistics to update. Readers
increment the global generation counter to effectively grab a snapshot
of the statistics, and then iterate over all Ps using the sequence
counter to ensure that they may safely read the snapshotted statistics.
To keep statistics fresh, the reader also has a responsibility to merge
sets of statistics.
These consistent statistics are computed, but otherwise unused for now.
Upcoming changes will integrate them with the rest of the codebase and
will begin to phase out existing statistics.
Change-Id: I637a11f2439e2049d7dccb8650c5d82500733ca5
Reviewed-on: https://go-review.googlesource.com/c/go/+/247037
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change adds a function getMCache which returns the current P's
mcache if it's available, and otherwise tries to get mcache0 if we're
bootstrapping. This function will come in handy as we need to replicate
this behavior in multiple places in future changes.
Change-Id: I536073d6f6dc6c6390269e613ead9f8bcb6e7f98
Reviewed-on: https://go-review.googlesource.com/c/go/+/246976
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This statistic is updated in many places but for MemStats may be
computed from existing statistics. Specifically by definition
heap_idle = heap_sys - heap_inuse since heap_sys is all memory allocated
from the OS for use in the heap minus memory used for non-heap purposes.
heap_idle is almost the same (since it explicitly includes memory that
*could* be used for non-heap purposes) but also doesn't include memory
that's actually used to hold heap objects.
Although it has some utility as a sanity check, it complicates
accounting and we want fewer, orthogonal statistics for upcoming metrics
changes, so just drop it.
Change-Id: I40af54a38e335f43249f6e218f35088bfd4380d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/246974
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change breaks apart gc_sys into three distinct pieces. Two of those
pieces are pieces which come from heap_sys since they're allocated from
the page heap. The rest comes from memory mapped from e.g.
persistentalloc which better fits the purpose of a sysMemStat. Also,
rename gc_sys to gcMiscSys.
Change-Id: I098789170052511e7b31edbcdc9a53e5c24573f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/246973
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Currently MemStats is populated via an unsafe memmove from memstats, but
this places unnecessary structural restrictions on memstats, is annoying
to reason about, and tightly couples the two. Instead, just populate the
fields of MemStats explicitly.
Change-Id: I96f6a64326b1a91d4084e7b30169a4bbe6a331f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/246972
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change modifies the type of several mstats fields to be a new type:
sysMemStat. This type has the same structure as the fields used to have.
The purpose of this change is to make it very clear which stats may be
used in various functions for accounting (usually the platform-specific
sys* functions, but there are others). Currently there's an implicit
understanding that the *uint64 value passed to these functions is some
kind of statistic whose value is atomically managed. This understanding
isn't inherently problematic, but we're about to change how some stats
(which currently use mSysStatInc and mSysStatDec) work, so we want to
make it very clear what the various requirements are around "sysStat".
This change also removes mSysStatInc and mSysStatDec in favor of a
method on sysMemStat. Note that those two functions were originally
written the way they were because atomic 64-bit adds required a valid G
on ARM, but this hasn't been the case for a very long time (since
golang.org/cl/14204, but even before then it wasn't clear if mutexes
required a valid G anymore). Today we implement 64-bit adds on ARM with
a spinlock table.
Change-Id: I4e9b37cf14afc2ae20cf736e874eb0064af086d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/246971
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change modifies mheap's span allocation API to have each caller
declare a purpose, defined as a new enum called spanAllocType.
The purpose behind this change is two-fold:
1. Tight control over who gets to allocate heap memory is, generally
speaking, a good thing. Every codepath that allocates heap memory
places additional implicit restrictions on the allocator. A notable
example of a restriction is work bufs coming from heap memory: write
barriers are not allowed in allocation paths because then we could
have a situation where the allocator calls into the allocator.
2. Memory statistic updating is explicit. Instead of passing an opaque
pointer for statistic updating, which places restrictions on how that
statistic may be updated, we use the spanAllocType to determine which
statistic to update and how.
We also take this opportunity to group all the statistic updating code
together, which should make the accounting code a little easier to
follow.
Change-Id: Ic0b0898959ba2a776f67122f0e36c9d7d60e3085
Reviewed-on: https://go-review.googlesource.com/c/go/+/246970
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change renames a bunch of malloc statistics stored in the mcache
that are all named with the "local_" prefix. It also renames largeAlloc
to allocLarge to prevent a naming conflict, and next_sample because it
would be the last mcache field with the old C naming style.
Change-Id: I29695cb83b397a435ede7e9ad5c3c9be72767ea3
Reviewed-on: https://go-review.googlesource.com/c/go/+/246969
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Now that local_scan is the last mcache-based statistic that is flushed
by purgecachedstats, and heap_scan and gcController.revise may be
interacted with concurrently, we don't need to flush heap_scan at
arbitrary locations where the heap is locked, and we don't need
purgecachedstats and cachestats anymore. Instead, we can flush
local_scan at the same time we update heap_live in refill, so the two
updates may share the same revise call.
Clean up unused functions, remove code that would cause the heap to get
locked in the allocSpan when it didn't need to (other than to flush
local_scan), and flush local_scan explicitly in a few important places.
Notably we need to flush local_scan whenever we flush the other stats,
but it doesn't need to be donated anywhere, so have releaseAll do the
flushing. Also, we need to flush local_scan before we set heap_scan at
the end of a GC, which was previously handled by cachestats. Just do so
explicitly -- it's not much code and it becomes a lot more clear why we
need to do so.
Change-Id: I35ac081784df7744d515479896a41d530653692d
Reviewed-on: https://go-review.googlesource.com/c/go/+/246968
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
This change removes mcentral.nmalloc and adds mcache.local_nsmallalloc
which fulfills the same role but may be accessed non-atomically. It also
moves responsibility for updating heap_live and local_nsmallalloc into
mcache functions.
As a result of this change, mcache is now the sole source-of-truth for
malloc stats. It is also solely responsible for updating heap_live and
performing the various operations required as a result of updating
heap_live. The overall improvement here is in code organization:
previously malloc stats were fairly scattered, and now they have one
single home, and nearly all the required manipulations exist in a single
file.
Change-Id: I7e93fa297c1debf17e3f2a0d68aeed28a9c6af00
Reviewed-on: https://go-review.googlesource.com/c/go/+/246966
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change makes nlargealloc and largealloc into mcache fields just
like nlargefree and largefree. These local fields become the new
source-of-truth. This change also moves the accounting for these fields
out of allocSpan (which is an inappropriate place for it -- this
accounting generally happens much closer to the point of allocation) and
into largeAlloc. This move is partially possible now that we can call
gcController.revise at that point.
Furthermore, this change moves largeAlloc into mcache.go and makes it a
method of mcache. While there's a little bit of a mismatch here because
largeAlloc barely interacts with the mcache, it helps solidify the
mcache as the first allocation layer and provides a clear place to
aggregate and manage statistics.
Change-Id: I37b5e648710733bb4c04430b71e96700e438587a
Reviewed-on: https://go-review.googlesource.com/c/go/+/246965
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change makes it so that various local malloc stats (excluding
heap_scan and local_tinyallocs) are no longer written first to mheap
fields but are instead accessed directly from each mcache.
This change is part of a move toward having stats be distributed, and
cleaning up some old code related to the stats.
Note that because there's no central source-of-truth, when an mcache
dies, it must donate its stats to another mcache. It's always safe to
donate to the mcache for the 0th P, so do that.
Change-Id: I2556093dbc27357cb9621c9b97671f3c00aa1173
Reviewed-on: https://go-review.googlesource.com/c/go/+/246964
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
This change makes it so that the GC assist ratio (the pair of
gcControllerState fields assistBytesPerWork and assistWorkPerByte) is
updated atomically. Note that the pair of fields are not updated
together atomically, but that's OK. The code here was already racy for
some time and in practice the assist ratio moves very slowly.
The purpose of this change is so that we can document
gcController.revise to be safe for concurrent use, which will be useful
in further changes.
Change-Id: Ie25d630207c88e4f85f2b8953f6a0051ebf1b4ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/246963
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
next_gc is mostly updated only during a STW, but may occasionally be
updated by calls to e.g. debug.SetGCPercent. In this case the update is
supposed to be protected by the heap lock, but in reality it's accessed
by gcController.revise which may be called without the heap lock held
(despite its documentation, which will be updated in a later change).
Change the synchronization policy on next_gc so that it's atomically
accessed when the world is not stopped to aid in making revise safe for
concurrent use.
Change-Id: I79657a72f91563f3241aaeda66e8a7757d399529
Reviewed-on: https://go-review.googlesource.com/c/go/+/246962
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
gcControllerState.scanWork's docs state that it must be accessed
atomically during a GC cycle, but gcControllerState.revise does not do
this (even when called with the heap lock held).
This change makes it so that gcControllerState.revise accesses scanWork
atomically and explicitly.
Note that we don't update gcControllerState.revise's erroneous doc
comment here because this change isn't about revise's guarantees, just
about heap_scan. The comment is updated in a later change.
Change-Id: Iafc3ad214e517190bfd8a219896d23da19f7659d
Reviewed-on: https://go-review.googlesource.com/c/go/+/246961
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Currently heap_scan is mostly protected by the heap lock, but
gcControllerState.revise sometimes accesses it without a lock. In an
effort to make gcControllerState.revise callable from more contexts (and
have its synchronization guarantees actually respected), make heap_scan
atomically read from and written to, unless the world is stopped.
Note that we don't update gcControllerState.revise's erroneous doc
comment here because this change isn't about revise's guarantees, just
about heap_scan. The comment is updated in a later change.
Change-Id: Iddbbeb954767c704c2bd1d221f36e6c4fc9948a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/246960
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
The Windows callback support accepts Go functions with arguments that
are uintptr-sized or smaller. However, it doesn't implement smaller
arguments correctly. It assumes the Windows arguments layout is
equivalent to the Go argument layout. This is often true, but because
Windows C ABIs pad arguments to word size, while Go packs arguments,
the layout is different if there are multiple sub-word-size arguments
in a row. For example, a function with two uint16 arguments will have
a two-word C argument frame, but only a 4 byte Go argument frame.
There are also subtleties surrounding floating-point register
arguments that it doesn't handle correctly.
To fix this, when constructing a callback, we examine the Go
function's signature to construct a mapping between the C argument
frame and the Go argument frame. When the callback is invoked, we use
this mapping to build the Go argument frame and copy the result back.
This adds several test cases to TestStdcallAndCDeclCallbacks that
exercise more complex function signatures. These all fail with the
current code, but work with this CL.
In addition to fixing these callback types, this is also a step toward
the Go register ABI (#40724), which is going to make the ABI
translation more complex.
Change-Id: I19fb1681b659d9fd528ffd5e88912bebb95da052
Reviewed-on: https://go-review.googlesource.com/c/go/+/263271
Trust: Austin Clements <austin@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This simplifies the systematic test of Windows callbacks with
different signatures and prepares it for expanded coverage of function
signatures.
It now returns a result from the Go function and threads it back
through C. This simplifies things, but also previously the code could
have succeeded by simply not calling the callbacks at all (though
other tests would have caught that).
It bundles together the C function description and the Go function
it's intended to call. Now the test source generation and the test
running both loop over a single slice of test functions.
Since the C function and Go function are now bundled, it generates the
C function by reflectively inspecting the signature of the Go
function. For the moment, we keep the same test suite, which is
entirely functions with "uintptr" arguments, but we'll expand this
shortly.
It now use sub-tests. This way tests automatically get useful
diagnostic labels in failures and the tests don't have to catch panics
on their own.
It eliminates the DLL function argument. I honestly couldn't figure
out what the point of this was, and it added what appeared to be an
unnecessary loop level to the tests.
Change-Id: I120dfd4785057cc2c392bd2c821302f276bd128e
Reviewed-on: https://go-review.googlesource.com/c/go/+/263270
Trust: Austin Clements <austin@google.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Austin Clements <austin@google.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
On amd64 and 386, we have a very roundabout way of remembering that we
need to dropm on return that currently involves saving a zero to
needm's argument slot and later bringing it back. Just store the zero.
This also makes amd64 and 386 more consistent with cgocallback on all
other platforms: rather than saving the old M to the G stack, they now
save it to a named slot on the G0 stack.
The needm function no longer needs a dummy argument to get the SP, so
we drop that.
Change-Id: I7e84bb4a5ff9552de70dcf41d8accf02310535e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/263268
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This redesigns the way calls work from C to exported Go functions. It
removes several steps from the call path, makes cmd/cgo no longer
sensitive to the Go calling convention, and eliminates the use of
reflectcall from cgo.
In order to avoid generating a large amount of FFI glue between the C
and Go ABIs, the cgo tool has long depended on generating a C function
that marshals the arguments into a struct, and then the actual ABI
switch happens in functions with fixed signatures that simply take a
pointer to this struct. In a way, this CL simply pushes this idea
further.
Currently, the cgo tool generates this argument struct in the exact
layout of the Go stack frame and depends on reflectcall to unpack it
into the appropriate Go call (even though it's actually
reflectcall'ing a function generated by cgo).
In this CL, we decouple this struct from the Go stack layout. Instead,
cgo generates a Go function that takes the struct, unpacks it, and
calls the exported function. Since this generated function has a
generic signature (like the rest of the call path), we don't need
reflectcall and can instead depend on the Go compiler itself to
implement the call to the exported Go function.
One complication is that syscall.NewCallback on Windows, which
converts a Go function into a C function pointer, depends on
cgocallback's current dynamic calling approach since the signatures of
the callbacks aren't known statically. For this specific case, we
continue to depend on reflectcall. Really, the current approach makes
some overly simplistic assumptions about translating the C ABI to the
Go ABI. Now we're at least in a much better position to do a proper
ABI translation.
For comparison, the current cgo call path looks like:
GoF (generated C function) ->
crosscall2 (in cgo/asm_*.s) ->
_cgoexp_GoF (generated Go function) ->
cgocallback (in asm_*.s) ->
cgocallback_gofunc (in asm_*.s) ->
cgocallbackg (in cgocall.go) ->
cgocallbackg1 (in cgocall.go) ->
reflectcall (in asm_*.s) ->
_cgoexpwrap_GoF (generated Go function) ->
p.GoF
Now the call path looks like:
GoF (generated C function) ->
crosscall2 (in cgo/asm_*.s) ->
cgocallback (in asm_*.s) ->
cgocallbackg (in cgocall.go) ->
cgocallbackg1 (in cgocall.go) ->
_cgoexp_GoF (generated Go function) ->
p.GoF
Notably:
1. We combine _cgoexp_GoF and _cgoexpwrap_GoF and move the combined
operation to the end of the sequence. This combined function also
handles reflectcall's previous role.
2. We combined cgocallback and cgocallback_gofunc since the only
purpose of having both was to convert a raw PC into a Go function
value. We instead construct the Go function value in cgocallbackg1.
3. cgocallbackg1 no longer reaches backwards through the stack to get
the arguments to cgocallback_gofunc. Instead, we just pass the
arguments down.
4. Currently, we need an explicit msanwrite to mark the results struct
as written because reflectcall doesn't do this. Now, the results are
written by regular Go assignments, so the Go compiler generates the
necessary MSAN annotations. This also means we no longer need to track
the size of the arguments frame.
Updates #40724, since now we don't need to teach cgo about the
register ABI or change how it uses reflectcall.
Change-Id: I7840489a2597962aeb670e0c1798a16a7359c94f
Reviewed-on: https://go-review.googlesource.com/c/go/+/258938
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Stackmap symbols are content-addressable, so it may be dedup'd
with another symbol with same content. We want stackmap symbols
4-byte aligned. But if it dedup's with another symbol with larger
alignment, preserve that alignment.
Fixes#42071.
Change-Id: I1616dd2b0c175b2aac8f68782a5c7a62053c0b57
Reviewed-on: https://go-review.googlesource.com/c/go/+/264897
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Than McIntosh <thanm@google.com>
Do not mimic glibc behavior if /etc/nsswitch.conf is missing. This will
will likely be missing on musl libc systems and glibc systems will likely
always have it, resulting in localhost lookup being done over DNS rather
than from /etc/hosts.
Do what makes most sense rather than making any assumption about the
libc.
Fixes#35305
Change-Id: I20bd7e24131bba8eaa39a20c8950fe552364784d
GitHub-Last-Rev: 119409839d
GitHub-Pull-Request: golang/go#39685
Reviewed-on: https://go-review.googlesource.com/c/go/+/238629
Run-TryBot: Dan Peterson <dpiddy@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Peterson <dpiddy@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Fixes#42079
Previously, EvalSymlinks returned an error when called with the root of
a UNC share (e.g. \\server\share). This was due to Windows's
FindFirstFile function not supporting a share root path.
To resolve this, now return early from toNorm in the case where the path
after the volume name is empty. Skipping the later path component
resolution shouldn't have any negative impact in this case, as if the
path is empty, there aren't any path components to resolve anyways.
The test case uses the localhost admin share (c$), as it should be
present in most situations. This allows testing without setting up an
external file share. However, this fix applies to all UNC share root
paths.
Change-Id: I05035bd86be93662d7bea34fab4b75fc8e918206
GitHub-Last-Rev: bd3db2cda6
GitHub-Pull-Request: golang/go#42096
Reviewed-on: https://go-review.googlesource.com/c/go/+/263917
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Giovanni Bajo <rasky@develer.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
It might not be obvious from reading the code why we consider the test
as failed on incomplete ports even though it passed. Add a comment
documenting this behavior, as suggested by Dmitri in CL 155839.
Change-Id: I3eb7db27d01d63db277172381e5fa51577dad941
Reviewed-on: https://go-review.googlesource.com/c/go/+/264682
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Add support for signed and unsigned register to register moves of various
sizes. This makes it easier to handle zero and sign extension and will allow
for further changes that improve the compiler optimisations for riscv64.
While here, change the existing register to register moves from obj.Prog
rewriting to instruction generation.
Change-Id: Id21911019b76922367a134da13c3449a84a1fb08
Reviewed-on: https://go-review.googlesource.com/c/go/+/264657
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Updates the (*Data).Ranges method to work with DWARFv5 which uses the
new debug_rnglists section instead of debug_ranges.
This does not include supporting DW_FORM_rnglistx.
General support for DWARFv5 was added by CL 175138.
Change-Id: I01f919a865616a3ff12f5bf649c2c9abf89fcf52
Reviewed-on: https://go-review.googlesource.com/c/go/+/236657
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
For some reason, currently unknown, this test case fails exclusively
on the linux-ppc64 platform. Until such time as it can be made to
work, we'll disable this test case on that platform.
The same issue causes TestSetuidEtc to fail too, so disable that
on this platform.
Updates #42178
Change-Id: Idd3f6c2ee9f2fba2eb8ce4de69de7f316858bb15
Reviewed-on: https://go-review.googlesource.com/c/go/+/264719
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This prevents the custom-built version of openssl prefering the system
libraries over the ones compiled with the specified (weak crypto)
options necessary to generate the updates. This difference can lead to
confusing failures when updating the tests.
Fixes#31809
Change-Id: I2dd257f3121d6c6c62c6aeba52e1c74046b3c584
GitHub-Last-Rev: 6d4eeafadf
GitHub-Pull-Request: golang/go#41630
Reviewed-on: https://go-review.googlesource.com/c/go/+/257517
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
addrRanges represents a set of addresses. Currently, passing in a
zero-sized range will cause that range to be added to the list, even
though it doesn't represent any address (addrRanges.contains will still
always return false, and findSucc will give surprising results).
We could ignore this input, but it's almost always a bug for the calling
code to pass in a zero-sized range, so just throw.
Change-Id: I8ed09e15b79a3a33e2d0cf5ed55f9e497388e7a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/242817
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
To allow passing around the package level *Logger, it is now exposed to
callers of the Default function. We considered exposing std, however at
this time there is no need to allow callers to replace std only pass and
call methods directly.
Fixes#39057
Change-Id: I710b16a3aa5e4e878870561dbf59560f98d8d09a
Reviewed-on: https://go-review.googlesource.com/c/go/+/264460
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
The existing usage of grave accent (`) and apostrophe (')
at some places made godoc to ignore them and show it as it is.
So, use both of the characters twice (consecutively) so that
godoc can convert it to {left,right} double quotation mark.
Fixes#41958
Change-Id: I64fd9b5fa34f416ad595009d09f5482e10bd8b4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/262397
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
This reset of gcBlackenEnabled is a no-op because it was already reset
almost immediately before in gcMarkDone, which is the only caller of
gcMarkTermination.
Adjust the comment to clarify setGCPhase a bit more. We are coming from
_GCmark, so write barriers are already enabled.
Change-Id: Ieac2dadf33c3c5a44e8a25a499dea8cfe03b8d73
Reviewed-on: https://go-review.googlesource.com/c/go/+/241357
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
In readonly mode, if a package is not provided by any module in the
build list, and there is an unused replacement that contains the
package, we now recommend a 'go get' command to add a requirement on
the highest replaced version.
Fixes#41416
Change-Id: Iedf3539292c70ea6ba6857433fd184454d9325da
Reviewed-on: https://go-review.googlesource.com/c/go/+/263146
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Previously, we would retain entries in go.sum for .mod files in the
module graph (reachable from the main module) and for .zip files
of modules providing packages.
This isn't quite enough: when we load a package, we need the content
of each module in the build list that *could* provide the package
(that is, each module whose path is a prefix of the package's path) so
we can diagnose ambiguous imports.
For #33008
Change-Id: I0b4d9d68c1f4ca382f0983a3a7e537764f35c3aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/262781
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
If the go command needs a .mod or .zip file in -mod=readonly mode
(now the default), and that file doesn't have a hash in the main
module's go.sum file, the go command will now report an error before
fetching the file, rather than at the end when failing to update
go.sum. The error says specifically which entry is missing.
If this error is encountered when loading the build list, it will
suggest 'go mod tidy'.
If this error is encountered when loading a specific package (an
import or command line argument), the error will mention that package
and will suggest 'go mod tidy' or 'go get -d'.
Fixes#41934Fixes#41935
Change-Id: I96ec2ef9258bd4bade9915c43d47e6243c376a81
Reviewed-on: https://go-review.googlesource.com/c/go/+/262341
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
When 'go mod init' is run in an existing project, it may import
requirements from a vendor configuration file, but the requirements
may not be complete, and go.sum won't contain sums for module
zips. With -mod=readonly, the next build command is likely to fail.
'go mod init' will now suggest running 'go mod tidy' if there are .go
files or subdirectories in the current directory.
We could potentially run 'go mod tidy' automatically within
'go mod init', but it seems better to guide users to using 'go mod tidy'
as a separate command to fix missing dependencies.
For #41712
Updates #40278
Change-Id: Iaece607f291244588a732ef4c5d576108965ca91
Reviewed-on: https://go-review.googlesource.com/c/go/+/264622
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
InitMod is split into two functions. LoadModFile parses an existing
go.mod file and loads the build list (or checks vendor/modules.txt for
consistency in vendor mode). CreateModFile creates a new go.mod file,
possibly inferring the module path and importing a vendor
configuration file.
Some logic is moved from runInit to CreateModFile. init-specific logic
is removed from other functions.
This CL shouldn't cause substantial differences in behavior, though
some error messages are slightly different.
For #41712
Change-Id: Ia684945cfcf5beca30bbb81e7144fc246c4f27ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/264621
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Previously, if a go.mod file was present, and it only contained a
module directive, any module-aware command would attempt to import
requirements from a vendor configuration file like Gopkg.lock.
This CL removes that functionality. It was undocumented and untested,
and it can cause problems with -mod=readonly. It should never come up
for go.mod files created with 'go mod init', since they have a "go"
directive.
For #40278
Change-Id: I64c0d67d204560aa5c775d29553883d094fd3b72
Reviewed-on: https://go-review.googlesource.com/c/go/+/264620
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This change adds two new methods for invoking system calls
under Linux: syscall.AllThreadsSyscall() and
syscall.AllThreadsSyscall6().
These system call wrappers ensure that all OSThreads mirror
a common system call. The wrappers serialize execution of the
runtime to ensure no race conditions where any Go code observes
a non-atomic OS state change. As such, the syscalls have
higher runtime overhead than regular system calls, and only
need to be used where such thread (or 'm' in the parlance
of the runtime sources) consistency is required.
The new support is used to enable these functions under Linux:
syscall.Setegid(), syscall.Seteuid(), syscall.Setgroups(),
syscall.Setgid(), syscall.Setregid(), syscall.Setreuid(),
syscall.Setresgid(), syscall.Setresuid() and syscall.Setuid().
They work identically to their glibc counterparts.
Extensive discussion of the background issue addressed in this
patch can be found here:
https://github.com/golang/go/issues/1435
In the case where cgo is used, the C runtime can launch pthreads that
are not managed by the Go runtime. As such, the added
syscall.AllThreadsSyscall*() return ENOTSUP when cgo is enabled.
However, for the 9 syscall.Set*() functions listed above, when cgo is
active, these functions redirect to invoke their C.set*() equivalents
in glibc, which wraps the raw system calls with a nptl:setxid fixup
mechanism. This achieves POSIX semantics for these functions in the
combined Go and C runtime.
As a side note, the glibc/nptl:setxid support (2019-11-30) does not
extend to all security related system calls under Linux so using
native Go (CGO_ENABLED=0) and these AllThreadsSyscall*()s, where
needed, will yield more well defined/consistent behavior over all
threads of a Go program. That is, using the
syscall.AllThreadsSyscall*() wrappers for things like setting state
through SYS_PRCTL and SYS_CAPSET etc.
Fixes#1435
Change-Id: Ib1a3e16b9180f64223196a32fc0f9dce14d9105c
Reviewed-on: https://go-review.googlesource.com/c/go/+/210639
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Ian Lance Taylor <iant@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This adds a pass to detect common selection operations,
to avoid generating duplicates. Duplicate offsets are
also detected.
All aggregate types are now handled; there is some freedom in where
expand_calls is run, though it must run before softfloat.
Debug-name-maintenance is now incremental both in decompose builtin
and in expand_calls; it might be good to push this into all the
decompose passes.
(this is a smash of 5 CLs that rewrote some of the same code several
times to deal with phase-ordering problems, and included an abandoned
attempt.)
For #40724.
Change-Id: I2a0c32f20660bf8b99e2bcecd33545d97d2bd3c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/249458
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The history of pageAlloc using 's' as a receiver are lost to the depths
of time (perhaps it used to be called summary?), but it doesn't make
much sense anymore. Rename it to 'p'.
Generated with:
$ cd src/runtime
$ grep -R -b "func (s \*pageAlloc" . | awk -F : '{ print $1 ":#" $2+6 }' | xargs -n 1 -I {} env GOROOT=$(pwd)/../../ gorename -offset {} -to p -v
$ grep -R -b "func (s \*pageAlloc" . | awk -F : '{ print $1 ":#" $2+6 }' | xargs -n 1 -I {} env GOROOT=$(pwd)/../../ GOARCH=386 gorename -offset {} -to p -v
$ GOROOT=$(pwd)/../../ gorename -offset mpagecache.go:#2397 -to p -v
($2+6 to advance past "func (".)
Plus manual comment fixups.
Change-Id: I2d521a1cbf6ebe2ef6aae92e654bfc33c63d1aa9
Reviewed-on: https://go-review.googlesource.com/c/go/+/250517
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
According to #28614, proposal review agreed in December 2018 that
Match should return an error for failed matches where the unmatched
part of the pattern has a syntax error. (The failed match has to date
caused the scan of the pattern to stop early.)
This change implements that behavior: the match loop continues
scanning to the end of the pattern, even after a confirmed mismatch,
to check whether the pattern is even well-formed.
The change applies to both path.Match and filepath.Match.
Then filepath.Glob and fs.Glob make a single validity-checking
call to Match before beginning their usual processing.
Also update fstest.TestFS to check for correct validation in custom
Glob implementations.
Fixes#28614.
Change-Id: Ic1d35a4bb9c3565184ae83dbefc425c5c96318e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/264397
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Work stealing is a scalability bottleneck in the scheduler. Since each P
has a work queue, work stealing must look at every P to determine if
there is any work. The number of Ps scales linearly with GOMAXPROCS
(i.e., the number of Ps _is_ GOMAXPROCS), thus this work scales linearly
with GOMAXPROCS.
Work stealing is a later attempt by a P to find work before it goes
idle. Since the P has no work of its own, extra costs here tend not to
directly affect application-level benchmarks. Where they show up is
extra CPU usage by the process as a whole. These costs get particularly
expensive for applications that transition between blocked and running
frequently.
Long term, we need a more scalable approach in general, but for now we
can make a simple observation: idle Ps ([1]) cannot possibly have
anything in their runq, so we need not bother checking at all.
We track idle Ps via a new global bitmap, updated in pidleput/pidleget.
This is already a slow path (requires sched.lock), so we don't expect
high contention there.
Using a single bitmap avoids the need to touch every P to read p.status.
Currently, the bitmap approach is not significantly better than reading
p.status. However, in a future CL I'd like to apply a similiar
optimization to timers. Once done, findrunnable would not touch most Ps
at all (in mostly idle programs), which will avoid memory latency to
pull those Ps into cache.
When reading this bitmap, we are racing with Ps going in and out of
idle, so there are a few cases to consider:
1. _Prunning -> _Pidle: Running P goes idle after we check the bitmap.
In this case, we will try to steal (and find nothing) so there is no
harm.
2. _Pidle -> _Prunning while spinning: A P that starts running may queue
new work that we miss. This is OK: (a) that P cannot go back to sleep
without completing its work, and (b) more fundamentally, we will recheck
after we drop our P.
3. _Pidle -> _Prunning after spinning: After spinning, we really can
miss work from a newly woken P. (a) above still applies here as well,
but this is also the same delicate dance case described in findrunnable:
if nothing is spinning anymore, the other P will unpark a thread to run
the work it submits.
Benchmark results from WakeupParallel/syscall/pair/race/1ms (see
golang.org/cl/228577):
name old msec new msec delta
Perf-task-clock-8 250 ± 1% 247 ± 4% ~ (p=0.690 n=5+5)
Perf-task-clock-16 258 ± 2% 259 ± 2% ~ (p=0.841 n=5+5)
Perf-task-clock-32 284 ± 2% 270 ± 4% -4.94% (p=0.032 n=5+5)
Perf-task-clock-64 326 ± 3% 303 ± 2% -6.92% (p=0.008 n=5+5)
Perf-task-clock-128 407 ± 2% 363 ± 5% -10.69% (p=0.008 n=5+5)
Perf-task-clock-256 561 ± 1% 481 ± 1% -14.20% (p=0.016 n=4+5)
Perf-task-clock-512 840 ± 5% 683 ± 2% -18.70% (p=0.008 n=5+5)
Perf-task-clock-1024 1.38k ±14% 1.07k ± 2% -21.85% (p=0.008 n=5+5)
[1] "Idle Ps" here refers to _Pidle Ps in the sched.pidle list. In other
contexts, Ps may temporarily transition through _Pidle (e.g., in
handoffp); those Ps may have work.
Updates #28808
Updates #18237
Change-Id: Ieeb958bd72e7d8fb375b0b1f414e8d7378b14e29
Reviewed-on: https://go-review.googlesource.com/c/go/+/259578
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Trust: Michael Pratt <mpratt@google.com>
This commit contains the compiler support for //go:embed lines.
The go command passes to the compiler an "embed config"
that maps literal patterns like *.txt to the set of files to embed.
The compiler then lays out the content of those files as static data
in the form of an embed.Files or string or []byte in the final object file.
The test for this code is the end-to-end test hooking up the
embed, cmd/compile, and cmd/go changes, in the next CL.
For #41191.
Change-Id: I916e57f8cc65871dc0044c13d3f90c252a3fe1bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/243944
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
embed.FS is the implementation of embedded file trees, providing
an fs.FS for each embed.FS variable.
Tests are in a follow-up CL, in the package embed/internal/embedtest.
(They can only be written once the toolchain can initialize one of these,
which requires changes to cmd/compile and cmd/go.)
For #41191.
Change-Id: Ieb0ead1d305cdac3d5d4e11772dca75740a72730
Reviewed-on: https://go-review.googlesource.com/c/go/+/243942
Trust: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This is somewhat academic (and no tests failed before this commit),
since func atof64 only calls func eiselLemire when func atof64exact
fails, and func atof64exact doesn't fail when parsing positive or
negative zeroes. But it's still worth fixing.
Change-Id: Ibe6ef4c8fd96827673b711d5456003fbc447e39c
Reviewed-on: https://go-review.googlesource.com/c/go/+/264140
Trust: Nigel Tao <nigeltao@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
In https://golang.org/cl/263357, I wasn't thinking that the assembly
file without a GOARCH suffix would be built for all architectures. Only
build assembly for amd64, and update the stderr matching line.
I manually verified that this works on 386; since the only Go file in
that package is a stub, and no assembly files match GOARCH=386, no
assembly is built at all.
Change-Id: Ief3c6c9bdc223f342821b0ec27f00098fc25246a
Reviewed-on: https://go-review.googlesource.com/c/go/+/264457
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
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The Go toolchain has supported the simulator for years, but always in
buildmode=c-archive which is intrinsically externally linked and PIE.
This CL moves that support from GOOS=darwin GOARCH=amd64 -tags=ios to
just GOOS=ios GOARCH=amd64 to match the change for iOS devices.
This change also forces external linking and defaults to buildmode=pie
to support Go binaries in the default buildmode to run on the simulator.
CL 255257 added the necessary support to the exec wrapper.
Updates #38485Fixes#42100
Change-Id: I6e6ee0e8d421be53b31e3d403880e5b9b880d031
Reviewed-on: https://go-review.googlesource.com/c/go/+/263798
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Elias Naur <mail@eliasnaur.com>
This way, a -toolexec tool can tell precisely what package is being
built when it's run. This was very hard to do before, because the tool
had to piece together that information given the build action's
arguments or flags.
Since there wasn't a good set of tests for -toolexec, add one in the
form of a test script. It builds a simple set of packages with a variety
of build tools, to ensure that all the cases behave as expected.
Like other recent master changes, include the changelog item for this
user-facing change too.
Fixes#15677.
Change-Id: I0a5a1d9485840323ec138b2e64b7e7dd803fdf90
Reviewed-on: https://go-review.googlesource.com/c/go/+/263357
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
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Trust: Daniel Martí <mvdan@mvdan.cc>
Current linkmode checking in determining package dependencies doesn't
take multiple -linkmode options into consideration, may lead to redundant
dependency on 'runtime/cgo'.
Fixes the problem and adds a testcase.
Change-Id: Iac5ea9fb3ca5ef931201afd0f3441f41f946c919
Reviewed-on: https://go-review.googlesource.com/c/go/+/263497
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
gc debug flags are currently stored in a 256-long array, that is then
addressed using the ASCII numeric value of the flag itself (a quirk
inherited from the old C compiler). It is also a little wasteful,
since we only define 16 flags, and the other 240 array elements are
always empty.
This change makes Debug a struct, which also provides static checking
that we're not referencing flags that does not exist.
Change-Id: I2f0dfef2529325514b3398cf78635543cdf48fe0
Reviewed-on: https://go-review.googlesource.com/c/go/+/263539
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The code in this CL does the work of looking for the "embed" import
and then finding and recording the arguments to //go:embed lines
in Go source files. The go command will use this information to prepare
information about embedded files to pass to the compiler.
The tests of the Package fields end up being end-to-end via the
go command (added in the CL with the go command changes),
like all the other Package fields.
For #41191.
Change-Id: I0c87b71ca809c0031603cc403c030d3088299e6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/243941
Trust: Russ Cox <rsc@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Fixes the check for the reserved namespace prefix
"xml" to be case insensitive, so as to match all variants of:
(('X'|'x')('M'|'m')('L'|'l'))
as mandated by Section 2.3 of https://www.w3.org/TR/REC-xml/
This is a roll forward of CL 203417, which was rolled back by CL 240179.
We've decided that the roll back was incorrect, and any broken tests
should be fixed.
The original CL 203417 was by Tamás Gulácsi.
Fixes#35151
For #39876
Change-Id: I2e6daa7aeb252531fba0b8a56086613e13059528
Reviewed-on: https://go-review.googlesource.com/c/go/+/264024
Trust: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Tests that if the combination of:
* HTTP multipart file payload size
* ParseMultipartForm's maxMemory parameter
* the internal leeway buffer size of 10MiB
overflows, then we'll report an overflow instead of silently
passing.
Reapplies and fixes CL 254977, which was reverted in CL 263658.
The prior test lacked a res.Body.Close(), so fixed that and
added a leaked Transport check to verify correctness.
Updates 40430.
Change-Id: I3c0f7ef43d621f6eb00f07755f04f9f36c51f98f
Reviewed-on: https://go-review.googlesource.com/c/go/+/263817
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
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Trust: Damien Neil <dneil@google.com>
The other named errors - UnmarshalTypeError, etc - in this package do
the same, so we should prepend the package prefix to error messages
for consistency.
Add a note to the release docs in case this is interpreted as
a breaking change.
Fixes#36221.
Change-Id: Ie24b532bbf9812e108c259fa377e2a6b64319ed4
Reviewed-on: https://go-review.googlesource.com/c/go/+/263619
Run-TryBot: Kevin Burke <kev@inburke.com>
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Trust: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Bypasses the signature verification check we previously added if the
signature algorithm is MD5WithRSA, as we only support this algorithm
for signing and not verification.
Change-Id: Idba6dbba8b365d6199d467526746b88a5f734af1
Reviewed-on: https://go-review.googlesource.com/c/go/+/264019
Run-TryBot: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
The original riscv64 port used the thread pointer (TP aka X4) register for
the g pointer, however this register is also used when TLS support is
required, resulting in a conflict (for example, when a signal is received
we have no way of readily knowing if X4 contains a pointer to the TCB or
a pointer to a g).
In order to support cgo, free up the X4 register by moving g to X27.
This unfortunately means that the X4 register is unused in non-cgo mode,
however the alternative is to not support cgo on this platform.
Update #36641
Change-Id: Idcaf3e8ccbe42972a1b8943aeefde7149d9c960a
Reviewed-on: https://go-review.googlesource.com/c/go/+/263477
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This happens with 'go env' and 'go bug'.
If GOFLAGS variable is set to something like '=value',
running `go env` panics with this error message:
goroutine 1 [running]:
cmd/go/internal/base.SetFromGOFLAGS(0xd96838)
cmd/go/internal/base/goflags.go:101 +0x9a7
main.main()
cmd/go/main.go:188 +0x755
This happens when the 'name' of the flag is not
specified ('=' or '=value'), with any combination of other flags.
Other commands show this error message:
go: parsing $GOFLAGS: non-flag
This happens only with 'env' and 'bug' because we have this:
https://go.googlesource.com/go/+/refs/heads/master/src/cmd/go/internal/base/goflags.go#40
New behaviour: ignore the bad flag, since we don't want to report
that with `go env` or `go bug`.
Fixes: #42013
Change-Id: I72602840ca00293d2a92ea28451b75b9799e3d6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/263098
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Trust: Michael Matloob <matloob@golang.org>
wasm_exec.js expects that either "require" is available or that the
globals "crypto", "TextEncoder" and "TextDecoder" are already defined.
Report a better error message if this is not the case, suggesting the
use of a polyfill.
Updates #41482
Change-Id: I5473cae15c98ae42e39f5928245b7762e7a5a8bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/261357
Trust: Richard Musiol <neelance@gmail.com>
Run-TryBot: Richard Musiol <neelance@gmail.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
The Dbg dumping of complex types was broken, because (I think) of a
recent change to handle recursive types correctly. Before this fix,
the Dump output of a closure node (where the last thing on the line is
the type of the node) was:
. . CLOSURE l(8) esc(h) tc(1) FUNC-@0
after this change it is:
. . CLOSURE l(8) esc(h) tc(1) FUNC-func(int) int
The problem is that that the 'mode == Fdbg' code was immediately
aborting the descent into tconv2, since it was calling down with the
same node that was just entered into the hash table.
Change-Id: Iee106b967cea1856dd92d4350681401dd34a23b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/264025
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Supports 386 and amd64 architectures on all operating systems.
Example output:
$ go test -bench=.*
goos: darwin
goarch: amd64
pkg: strconv
cpu: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz
BenchmarkAtof64Decimal-4 24431032 46.8 ns/op
...
As the displayed CPU information is only used for information
purposes it is lazily initialized when needed using the new
internal/sysinfo package.
This allows internal/cpu to stay without dependencies and avoid
initialization costs when the CPU information is not needed as
the new code to query the CPU name in internal/cpu can be
dead code eliminated if not used.
Fixes#39214
Change-Id: I77ae5c5d2fed6b28fa78dd45075f9f0a6a7f1bfd
Reviewed-on: https://go-review.googlesource.com/c/go/+/263804
Trust: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Make code cleaner and a bit more adaptable:
instead of an ever-growing list of arguments and results for readImports,
put everything in a fileInfo struct, and rename function to readGoInfo.
(Not a goInfo struct because it gets used for non-Go source files as well,
but that processing is much simpler.)
The refactoring simplifies the embed work in the next CL,
but this CL makes no semantic changes.
For #41191.
Change-Id: Id2de2a3b8d351adc1c919dcf79dfbe79fc3d5301
Reviewed-on: https://go-review.googlesource.com/c/go/+/243940
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
The main missing piece here was supporting Stat in the overlay
filesystem, in the parts of the package code that determines whether
an command line argument is a file on disk or a directory. so this
change adds a Stat function to the fsys package. It's implemented the
same way as the already existing fsys.lstat function, but instead of
os.Lstat, it calls os.Stat on disk files.
Then, the change changes parts of the package code to use the overlay
Stat instead of the os package's Stat.
For #39958
Change-Id: I8e478ae386f05b48d7dd71bd7e47584f090623df
Reviewed-on: https://go-review.googlesource.com/c/go/+/262617
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously, when running cmd/go tests, if the module root directory is
requested when modules are explicitly disabled, we printed a stack
trace in addition to the error message that's normally printed. The
stack trace isn't that useful, and it makes the actual error hard to
find.
Change-Id: I8230d668f3f16659f08d0d685124c41b4055c5b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/263659
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The old ioutil references are still valid, but update our code
to reflect best practices and get used to the new locations.
Code compiled with the bootstrap toolchain
(cmd/asm, cmd/dist, cmd/compile, debug/elf)
must remain Go 1.4-compatible and is excluded.
Also excluded vendored code.
For #41190.
Change-Id: I6d86f2bf7bc37a9d904b6cee3fe0c7af6d94d5b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/263142
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
As proposed and approved in #40025, Discard, NopCloser, and ReadAll
do not really fit into io/ioutil, which exists mainly to hold things that
would cause an import cycle if implemented in io itself, which is to say
things that import "os".
These three do not import "os" - they are generic io helpers like
many of the things in io itself, so it makes sense for them to be there.
Fixes#40025.
Change-Id: I77f47e9b2a72839edf7446997936631980047b67
Reviewed-on: https://go-review.googlesource.com/c/go/+/263141
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Two different functions in the http API expect a FileSystem:
http.FileSystem and http.NewFileTransport.
Add a general converter http.FS to turn an fs.FS into an http.FileSystem
for use with either of these functions.
(The original plan was to add http.HandlerFS taking an fs.FS directly,
but that doesn't help with NewFileTransport.)
For #41190.
Change-Id: I5f242eafe9b963f4387419a2615bdb487c358f16
Reviewed-on: https://go-review.googlesource.com/c/go/+/243939
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Add Stat helper function, StatFS interface, and test.
Add Stat method to fstest.MapFS.
Add testing of Stat method to fstest.TestFS.
For #41190.
Change-Id: Icf8b6eb1c3fa6f93a9be8405ec5a9468fb1da97b
Reviewed-on: https://go-review.googlesource.com/c/go/+/243913
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
It will inevitably be important to be able to pass an operating system
directory to code written to expect an fs.FS.
os.DirFS provides the conversion.
For #41190.
Change-Id: Id1a8fcbe4c7a30de2c47dea0504e9481a88b1b39
Reviewed-on: https://go-review.googlesource.com/c/go/+/243911
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This change adds basic test helpers for file system code.
The type MapFS is a simple map-based file system for use when
exercising general file system code.
The func TestFS tests a file system implementation.
For #41190.
Change-Id: I5a2036f57e733915ad508651ad7317749794423c
Reviewed-on: https://go-review.googlesource.com/c/go/+/243910
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Because the "ios" build constraint implies "darwin", it is already
included in the general "darwin" flakiness workaround in
cmd/go/internal/robustio. We just need to relax the renameio test
to avoid false-positives there.
I do not expect this change to drive the rate of false-positives down
to zero, but it should at least reduce noise on the build dashboard.
For #42066
Change-Id: Ia33dbd33295fce5b3261b4831f2807ce29b82e65
Reviewed-on: https://go-review.googlesource.com/c/go/+/263777
Trust: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Currently the scavenging tests implicitly assume that the system huge
page size is always strictly less than 4 MiB, or pallocChunkBytes. This
leads to failures on systems with huge pages of this size, and larger.
Filter out those tests on such platforms and add a test for the 4 MiB
case. The scavenger is already equipped to handle this case.
Huge page sizes > 4 MiB are effectively ignored, so also add a test case
to ensure that happens.
Unfortunately we can't actually run these tests in our CI because they
require the platform to provide the right huge page size, but we really
should just parameterize this value so we can test it (there's a TODO
about this already).
Fixes#42053.
Change-Id: Ia576cbf67e178a14a178a893967efbed27d6eb17
Reviewed-on: https://go-review.googlesource.com/c/go/+/263837
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
That is, the following two pieces of shell code are now equivalent:
$ go tool buildid $(go list -export -f {{.Export}} strings)
v_0VqA6yzwuMg2dn4u57/PXcIR2Pb8Mi9yRdcdkwe
$ go list -export -f {{.BuildID}} strings
v_0VqA6yzwuMg2dn4u57/PXcIR2Pb8Mi9yRdcdkwe
This does not expose any information that wasn't available before, but
makes this workflow simpler and faster. In the first example, we have to
execute two programs, and 'go tool buildid' has to re-open the export
data file to read the build ID.
With the new mechanism, 'go list -export' already has the build ID
ready, so we can simply print it out. Moreover, when listing lots of
related packages like './...', we can now obtain all their build IDs at
once.
Fixes#37281.
Change-Id: I8e2f65a08391b3df1a628c6e06e708b8c8cb7865
Reviewed-on: https://go-review.googlesource.com/c/go/+/263542
Trust: Daniel Martí <mvdan@mvdan.cc>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
When cpu_no_init.go was created most architectures did not have
code in the doinit function. Currently only mips(le), riscv64 and
wasm do not have empty doinit functions.
Keeping cpu_no_init.go around does not reduce the work to satisfy
the build process when adding support for new architectures.
To support a new architecture a new file or build directive has to
be added to an existing file at any rate to define the constant
CacheLinePadSize. A new empty doinit can then be created in the
new file or the existing doinit can be reused when adding the
additional build directive.
Change-Id: I58a97f8cdf1cf1be85c37f4550c40750358aa031
Reviewed-on: https://go-review.googlesource.com/c/go/+/263801
Trust: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
There are many reader behaviors that are subtle and
worth testing, and it's nice to have one complete tester
instead of many incomplete ones.
For #41190, which will use this as part of a larger
file system implementation tester.
Change-Id: Ib4cc7fae94b0d9b45dfacadc52baa77ad3761322
Reviewed-on: https://go-review.googlesource.com/c/go/+/243909
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
The old os references are still valid, but update our code
to reflect best practices and get used to the new locations.
Code compiled with the bootstrap toolchain
(cmd/asm, cmd/dist, cmd/compile, debug/elf)
must remain Go 1.4-compatible and is excluded.
For #41190.
Change-Id: I8f9526977867c10a221e2f392f78d7dec073f1bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/243907
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
ReadDir provides a portable, efficient way to read a directory
and discover the type of directory entries.
This enables a more efficient file system walk, yet to be added.
See #41467 for the proposal review for the API.
Fixes#41467.
Change-Id: I461a526793ae46df48821aa448b04f1705546739
Reviewed-on: https://go-review.googlesource.com/c/go/+/261540
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
OCALLPART is exported in its original form, which is as an OXDOT.
The body of the method value wrapper created in makepartialcall() was
not being typechecked, and that was causing a problem during escape
analysis, so I added code to typecheck the body.
The go executable got slightly bigger with this change (13598111 ->
13598905), because of extra exported methods with OCALLPART (I
believe), while the text size got slightly smaller (9686964 ->
9686643).
This is mainly part of the work to make sure all function bodies can
be exported (for purposes of generics), but might as well fix the
OCALLPART inlining bug as well.
Fixes#18493
Change-Id: If7aa055ff78ed7a6330c6a1e22f836ec567d04fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/263620
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
finlock may be held across a write barrier, which could then acquire the
mheap lock. Notably, this occurs in the mp.unlockf write in gopark where
finlock is held by the finalizer goroutines and is going to sleep.
Fixes#42062.
Change-Id: Icf76637ae6fc12795436272633dca3d473780875
Reviewed-on: https://go-review.googlesource.com/c/go/+/263678
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
asNode(t.Nod).Name.Param will be nil for builtin types (i.e., the
universal predeclared types and unsafe.Pointer). These types can't be
part of a cycle anyway, so we can just skip them.
Fixes#42075.
Change-Id: Ic7a44de65c6bfd16936545dee25e36de8850acf3
Reviewed-on: https://go-review.googlesource.com/c/go/+/263717
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This extends a change made in https://golang.org/cl/252258 to the go
command (to define an asm macro when GOEXPERIMENT=regabi is in
effect); we need this same macro during the bootstrap build in order
to build the runtime correctly.
In addition, expand the set of packages where the macro is applied to
{runtime, reflect, syscall, runtime/internal/*}, and move the logic
for deciding when something is a "runtime package" out of the
assembler and into cmd/{go,dist}, introducing a new assembler command
line flag instead.
Updates #27539, #40724.
Change-Id: Ifcc7f029f56873584de1e543c55b0d3e54ad6c49
Reviewed-on: https://go-review.googlesource.com/c/go/+/262317
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The fastest compression mode can pick up a false match for every 2GB
of input data resulting in incorrectly decompressed data.
Since matches are allowed to be up to and including at maxMatchOffset
we must offset the buffer by an additional element to prevent the first
4 bytes to match after an out-of-reach value after shiftOffsets has
been called.
We offset by `maxMatchOffset + 1` so offset 0 in the table will now
fail the `if offset > maxMatchOffset` in all cases.
Fixes#41420
Change-Id: If1fbe01728e132b8a207e3f3f439edd832dcc710
GitHub-Last-Rev: 50fabab0da
GitHub-Pull-Request: golang/go#41477
Reviewed-on: https://go-review.googlesource.com/c/go/+/255879
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Joe Tsai <thebrokentoaster@gmail.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Like we do for applying relocations, for generator symbols, run
the generator function along with symbol writing. This will
probably have better locality and parallelism.
Linking cmd/compile,
Asmb 29.9ms ± 5% 19.1ms ±12% -36.18% (p=0.000 n=10+9)
TotalTime 351ms ± 3% 339ms ± 2% -3.51% (p=0.000 n=11+10)
Change-Id: I9cda6718bf70b3bcf1b7a501a845d6136234d2ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/263640
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Use GOOS=ios.
Run "xcodebuild -showsdks" correctly.
Wrap testDWARF in subtests, as it calls t.Parallel, otherwise
the two calls of testDWARF will cause t.Parallel being called
twice, which panics.
Updates #38485.
Change-Id: I614c8daa99c83cbfd05a4cfa041968d49279f16a
Reviewed-on: https://go-review.googlesource.com/c/go/+/263639
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Also put Reset in the correct place for the other
benchmarks.
name old time/op new time/op delta
NewWriteSum-8 1.01µs ± 0% 1.01µs ± 1% ~ (p=0.945 n=9+9)
name old speed new speed delta
NewWriteSum-8 31.7MB/s ± 0% 31.6MB/s ± 1% ~ (p=0.948 n=9+9)
name old alloc/op new alloc/op delta
NewWriteSum-8 544B ± 0% 544B ± 0% ~ (all equal)
name old allocs/op new allocs/op delta
NewWriteSum-8 7.00 ± 0% 7.00 ± 0% ~ (all equal)
Fixes#41089
Change-Id: I3dae660adbe4993963130bf3c2636bd53899164b
Reviewed-on: https://go-review.googlesource.com/c/go/+/261960
Trust: Katie Hockman <katie@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
We don't put Go static symbols in the symbol table, as they are
always compiler-generated (there is no way to define a static
symbol in user code in Go). We retain static symbols in assembly
code, as it may be user-defined. Also retain static symbols in C.
Change-Id: Ie0425bb4df33f183857b1fd5ba4b2bdfdc497571
Reviewed-on: https://go-review.googlesource.com/c/go/+/263259
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Function symbols defined and referenced by assembly source currently
always default to ABI0; this patch adds preliminary support for
accepting an explicit ABI selector clause for func defs/refs. This
functionality is currently only enabled when compiling runtime-related
packages (runtime, syscall, reflect). Examples:
TEXT ·DefinedAbi0Symbol<ABI0>(SB),NOSPLIT,$0
RET
TEXT ·DefinedAbi1Symbol<ABIInternal>(SB),NOSPLIT,$0
CALL ·AbiZerolSym<ABI0>(SB)
...
JMP ·AbiInternalSym<ABIInternal>(SB)
RET
Also included is a small change to the code in the compiler that reads
the symabis file emitted by the assembler.
New behavior is currently gated under GOEXPERIMENT=regabi.
Updates #27539, #40724.
Change-Id: Ia22221fe26df0fa002191cfb13bdfaaa38d7df38
Reviewed-on: https://go-review.googlesource.com/c/go/+/260477
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Than McIntosh <thanm@google.com>
@jstarks suggested that recent versions of Windows provide access to high resolution timers. See
https://github.com/golang/go/issues/8687#issuecomment-656259353
for details.
I tried to run this C program on my Windows 10 computer
```
#include <stdio.h>
#include <Windows.h>
#pragma comment(lib, "Winmm.lib")
// Apparently this is already defined when I use msvc cl.
//#define CREATE_WAITABLE_TIMER_HIGH_RESOLUTION = 0x00000002;
int usleep(HANDLE timer, LONGLONG d) {
LARGE_INTEGER liDueTime;
DWORD ret;
LARGE_INTEGER StartingTime, EndingTime, ElapsedMicroseconds;
LARGE_INTEGER Frequency;
QueryPerformanceFrequency(&Frequency);
QueryPerformanceCounter(&StartingTime);
liDueTime.QuadPart = d;
liDueTime.QuadPart = liDueTime.QuadPart * 10; // us into 100 of ns units
liDueTime.QuadPart = -liDueTime.QuadPart; // negative for relative dure time
if (!SetWaitableTimer(timer, &liDueTime, 0, NULL, NULL, 0)) {
printf("SetWaitableTimer failed: errno=%d\n", GetLastError());
return 1;
}
ret = WaitForSingleObject(timer, INFINITE);
if (ret != WAIT_OBJECT_0) {
printf("WaitForSingleObject failed: ret=%d errno=%d\n", ret, GetLastError());
return 1;
}
QueryPerformanceCounter(&EndingTime);
ElapsedMicroseconds.QuadPart = EndingTime.QuadPart - StartingTime.QuadPart;
ElapsedMicroseconds.QuadPart *= 1000000;
ElapsedMicroseconds.QuadPart /= Frequency.QuadPart;
printf("delay is %lld us - slept for %lld us\n", d, ElapsedMicroseconds.QuadPart);
return 0;
}
int testTimer(DWORD createFlag)
{
HANDLE timer;
timer = CreateWaitableTimerEx(NULL, NULL, createFlag, TIMER_ALL_ACCESS);
if (timer == NULL) {
printf("CreateWaitableTimerEx failed: errno=%d\n", GetLastError());
return 1;
}
usleep(timer, 1000LL);
usleep(timer, 100LL);
usleep(timer, 10LL);
usleep(timer, 1LL);
CloseHandle(timer);
return 0;
}
int main()
{
printf("\n1. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is off - timeBeginPeriod is off\n");
testTimer(0);
printf("\n2. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is on - timeBeginPeriod is off\n");
testTimer(CREATE_WAITABLE_TIMER_HIGH_RESOLUTION);
timeBeginPeriod(1);
printf("\n3. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is off - timeBeginPeriod is on\n");
testTimer(0);
printf("\n4. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is on - timeBeginPeriod is on\n");
testTimer(CREATE_WAITABLE_TIMER_HIGH_RESOLUTION);
}
```
and I see this output
```
1. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is off - timeBeginPeriod is off
delay is 1000 us - slept for 4045 us
delay is 100 us - slept for 3915 us
delay is 10 us - slept for 3291 us
delay is 1 us - slept for 2234 us
2. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is on - timeBeginPeriod is off
delay is 1000 us - slept for 1076 us
delay is 100 us - slept for 569 us
delay is 10 us - slept for 585 us
delay is 1 us - slept for 17 us
3. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is off - timeBeginPeriod is on
delay is 1000 us - slept for 742 us
delay is 100 us - slept for 893 us
delay is 10 us - slept for 414 us
delay is 1 us - slept for 920 us
4. CREATE_WAITABLE_TIMER_HIGH_RESOLUTION is on - timeBeginPeriod is on
delay is 1000 us - slept for 1466 us
delay is 100 us - slept for 559 us
delay is 10 us - slept for 535 us
delay is 1 us - slept for 5 us
```
That shows, that indeed using CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
will provide sleeps as low as about 500 microseconds, while our
current approach provides about 1 millisecond sleep.
New approach also does not require for timeBeginPeriod to be on,
so this change solves long standing problem with go programs draining
laptop battery, because it calls timeBeginPeriod.
This change will only run on systems where
CREATE_WAITABLE_TIMER_HIGH_RESOLUTION flag is available. If not
available, the runtime will fallback to original code that uses
timeBeginPeriod.
This is how this change affects benchmark reported in issue #14790
name old time/op new time/op delta
ChanToSyscallPing 1.05ms ± 2% 0.68ms ±11% -35.43% (p=0.000 n=10+10)
The benchmark was run with GOMAXPROCS set to 1.
Fixes#8687
Updates #14790
Change-Id: I5b97ba58289c088c17c05292e12e45285c467eae
Reviewed-on: https://go-review.googlesource.com/c/go/+/248699
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>
In CL 258220 I added replacement versions to the repo versions used in
the modload.Query functions. The versions are computed from a map in
the modfile index, which has a nondeterministic iteration order.
I added a short-circuit condition to skip sorting in the (vastly
common) case where no replacement versions are added. However, while
cleaning up the change I accidentally deleted the line of code that
sets that condition. As a result, the test of that functionality
(mod_get_replaced) has been failing nondeterministically.
This change fixes the condition by comparing the slices before and
after adding versions, rather than by setting a separate variable.
The test now passes reliably (tested with -count=200).
Updates #41577
Updates #41416
Updates #37438
Updates #26241
Change-Id: I49a66a3a5510da00ef42b47f20a168de66100db6
Reviewed-on: https://go-review.googlesource.com/c/go/+/263266
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Also fix BenchmarkAtof64Random* to initialize the test data when none
of the TestAtof* tests are run.
Passing "go test -test.count=5 -test.run=xxx -test.bench=Atof64" on to
benchstat:
name old time/op new time/op delta
Atof64Decimal-4 47.9ns ± 0% 48.3ns ± 1% ~ (p=0.238 n=4+5)
Atof64Float-4 58.3ns ± 3% 57.7ns ± 0% ~ (p=0.151 n=5+5)
Atof64FloatExp-4 107ns ± 0% 71ns ± 1% -33.89% (p=0.016 n=4+5)
Atof64Big-4 163ns ± 0% 166ns ± 2% ~ (p=0.159 n=4+5)
Atof64RandomBits-4 299ns ± 1% 166ns ± 1% -44.41% (p=0.008 n=5+5)
Atof64RandomFloats-4 188ns ± 1% 144ns ± 0% -23.03% (p=0.008 n=5+5)
The canada.json file from github.com/miloyip/nativejson-benchmark is
full of geospatial coordinates (i.e. numbers). With this program:
src, _ := ioutil.ReadFile("canada.json")
for i := 0; i < 5; i++ {
now := time.Now()
for j := 0; j < 10; j++ {
dst := interface{}(nil)
if err := json.Unmarshal(src, &dst); err != nil {
log.Fatal(err)
}
}
fmt.Println(time.Since(now))
}
Median of the 5 printed numbers, lower is better.
Before: 760.819549ms
After: 702.651646ms
Ratio: 1.08x
The new detailedPowersOfTen table weighs in at 596 * 16 = 9536 bytes,
but some of that weight gain can be clawed back, in a follow-up commit,
that folds in the existing powersOfTen table in extfloat.go.
RELNOTE=yes
Change-Id: I3953110deaa1f5f6941e88e8417c4665b649ed80
Reviewed-on: https://go-review.googlesource.com/c/go/+/260858
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Nigel Tao <nigeltao@golang.org>
Illumos supports the accept4 syscall, use it in internal/poll.accept
like on other platforms.
Add Accept4 to package syscall despite the package being frozen. The
other option would have been to add this to internal/syscall/unix, but
adding it to syscall avoids duplicating a lot of code in internal/poll
and net/internal/socktest. Also, all other platforms supporting the
accept4 syscall already export Accept4.
Follow CL 97196, CL 40895 and CL 94295
Change-Id: I13b32f0163a683840c02b16722730d9dfdb98f56
Reviewed-on: https://go-review.googlesource.com/c/go/+/256101
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The Query function allows the caller to specify the current version of
the requested module, but the QueryPattern function is missing that
parameter: instead, it always assumes that the current version is the
one selected from the global build list.
This change removes that assumption, instead adding a callback
function to determine the current version. (The callback is currently
invoked once per candidate module, regardless of whether that module
exists, but in a future change we can refactor it to invoke the
callback only when needed.)
For #36460
For #40775
Change-Id: I001a4a8ab24f5b4fcc66a670d9bd305b47e948ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/261640
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
'go mod tidy' has been able to use replaced versions since CL 152739,
but 'go get' failed for many of the same paths. Now that we are
recommending 'go get' more aggressively due to #40728, we should make
that work too.
In the future, we might consider factoring out the new replacementRepo
type so that 'go list' can report the new versions as well.
For #41577
For #41416
For #37438
Updates #26241
Change-Id: I9140c556424b584fdd9bdd0a747842774664a7d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/258220
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
It was added in CL 240740 to fix#39978
but without any discussion of the exported API.
The error can still be returned to fix the issue,
without adding new public API to package io.
Also fix the error message to refer to lower-case write
like the other errors in the package.
Change-Id: I134de5eaf3ac903d73913c5cadcde904c5255d79
Reviewed-on: https://go-review.googlesource.com/c/go/+/262877
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
On 386 and arm, unaligned 64-bit atomics aren't safe, so we check for
this and panic. Currently, we panic by dereferencing nil, which may be
expedient but is pretty user-hostile since it gives no hint of what
the actual problem was.
This CL replaces this with an actual panic. The only subtlety here is
now the atomic assembly implementations are calling back into Go, so
they have to play nicely with stack maps and stack scanning. On 386,
this just requires declaring NO_LOCAL_POINTERS. On arm, this is
somewhat more complicated: first, we have to move the alignment check
into the functions that have Go signatures. Then we have to support
both the tail call from these functions to the underlying
implementation (which requires that they have no frame) and the call
into Go to panic (which requires that they have a frame). We resolve
this by forcing them to have no frame and setting up the frame
manually just before the panic call.
Change-Id: I19f1e860045df64088013db37a18acea47342c69
Reviewed-on: https://go-review.googlesource.com/c/go/+/262778
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This drops package prefixes from the assembly code on 386 and arm. In
addition to just being nicer, this allows the assembler to
automatically pick up the argument stack map from the Go signatures of
these functions. This doesn't matter right now because these functions
never call back out to Go, but prepares us for the next CL.
Change-Id: I90fed7d4dd63ad49274529c62804211b6390e2e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/262777
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This is primarily aimed at client requests where the user can supply
their own io.ReadCloser, but also clarifies server request behavior.
A server request body can be one of:
- *body
- *http2RequestBody
- *expectContinueReader
- *maxBytesReader
Of those, *expectContinueReader did not meet these expectations, so this
change also removes the data race.
Change-Id: Id4f1ae573d938347b1123a7b612b271aabb045a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/251087
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
In preparation for moving os.FileInfo into io/fs.
Also keep syscall from depending on io again.
We want to keep them separated, in case io ever
needs to start depending on time.
For #41190.
Change-Id: I98350fa03accf4a20c75ddebb0e961aa1ccccd2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/243905
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Apparently I never actually understood the new file table in Go
object files. The PC value stream actually encodes the file index
in the per-CU table. I thought it was indexing into a per-function
table, which then contains index to the per-CU table. Remove the
extra indirection.
Change-Id: I0aea5629f7b3888ebe3a04fea437aa15ce89519e
Reviewed-on: https://go-review.googlesource.com/c/go/+/262779
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
When a fix was made at the end of the last release related to
NOPs, it was discovered that the ppc64.s testcase was out of date
and contained comments that weren't being processed. Essentially the
instructions in that test were being assembled but there was no
verification that the encodings weres correct. The ppc64enc.s file
was mostly complete and included the valid encodings for verification.
This change moves ppc64enc.s to ppc64.s and adds the instructions
that were missing.
This also adds a minor fix to asm9.go on the assembly of the
addex that was discovered during this testing.
Change-Id: Iaada1563b137849ad195fa88f32ecc9ab3e1e95f
Reviewed-on: https://go-review.googlesource.com/c/go/+/260217
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
- Describe requirements on Less more precisely.
- Standardize on x for the variable name of the data being sorted
(was variously a, p, slice).
- Many other minor wording changes.
Fixes#41951.
Change-Id: Ic9e222a53ec035fcc3b5ddfc7f0eefbe1bb2890d
Reviewed-on: https://go-review.googlesource.com/c/go/+/262657
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This creates space for a different kind of extension field
in LSym without making the struct any larger.
(There are many LSym, so we care about keeping the struct small.)
Change-Id: Ib16edb9e15f54c2a7351c8b875e19684058711e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/243943
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Pass the trimpath flag to cmd/compile to use the correct file paths
for files that are overlaid: that is, the "destination" path in the
overlay's Replace mapping rather than the "source" path.
Also fix paths to go source files provided to the gccgo compiler.
For #39958
Change-Id: I3741aeb2272bd0d5aa32cb28133b61e58264fd39
Reviewed-on: https://go-review.googlesource.com/c/go/+/257198
Trust: Michael Matloob <matloob@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This CL replaces the ad hoc and duplicated logic for detecting
inlinable calls with a single "inlCallee" function, which uses the
"staticValue" helper function introduced in an earlier commit.
Updates #41474.
Change-Id: I103d4091b10366fce1344ef2501222b7df68f21d
Reviewed-on: https://go-review.googlesource.com/c/go/+/256460
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Matthew Dempsky <mdempsky@google.com>
On current macOS versions a program that receives a signal during an
execve can fail with a SIGILL signal. This appears to be a macOS
kernel bug. It has been reported to Apple.
This CL partially works around the problem by using execLock to not
send preemption signals during execve. Of course some other stray
signal could occur, but at least we can avoid exacerbating the problem.
We can't simply disable signals, as that would mean that the exec'ed
process would start with all signals blocked, which it likely does not
expect.
Fixes#41702
Change-Id: I91b0add967b315671ddcf73269c4d30136e579b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/262438
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
We already allow inlining "if" and "goto" statements, so we might as
well allow "for" loops too. The majority of frontend support is
already there too.
The critical missing feature at the moment is that inlining doesn't
properly reassociate OLABEL nodes with their control statement (e.g.,
OFOR) after inlining. This eventually causes SSA construction to fail.
As a workaround, this CL only enables inlining for unlabeled "for"
loops. It's left to a (yet unplanned) future CL to add support for
labeled "for" loops.
The increased opportunity for inlining leads to a small growth in
binary size. For example:
$ size go.old go.new
text data bss dec hex filename
9740163 320064 230656 10290883 9d06c3 go.old
9793399 320064 230656 10344119 9dd6b7 go.new
Updates #14768.
Fixes#41474.
Change-Id: I827db0b2b9d9fa2934db05caf6baa463f0cd032a
Reviewed-on: https://go-review.googlesource.com/c/go/+/256459
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Escape analysis is currently very naive about identifying calls to
known functions: it only recognizes direct calls to a declared
function, or direct calls to a closure.
This CL adds a new "staticValue" helper function that can trace back
through local variables that were initialized and never reassigned
based on a similar optimization already used by inlining. (And to be
used by inlining in a followup CL.)
Updates #41474.
Change-Id: I8204fd3b1e150ab77a27f583985cf099a8572b2e
Reviewed-on: https://go-review.googlesource.com/c/go/+/256458
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Normally, when variables are declared and initialized using ":=", we
set the variable's n.Name.Defn to point to the initialization
assignment node (i.e., OAS or OAS2). Further, some frontend
optimizations look for variables that are initialized but never
reassigned.
However, when inl.go inlines calls, it was declaring the inlined
variables, and then separately assigning to them. This CL changes
inl.go tweaks the AST to fit the combined declaration+initialization
pattern.
This isn't terribly useful by itself, but it allows further followup
optimizations.
Updates #41474.
Change-Id: I62a9752c60414305679e0ed15a6563baa0224efa
Reviewed-on: https://go-review.googlesource.com/c/go/+/256457
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
On a negative answer, the assignop and convertop functions write the
reason why to a string pointer passed as an argument, likely a C-ism
leftover since the compiler's machine assisted translation to Go.
This change makes why a return parameter.
It also fixes a few places where the assignop/convertop result was
compared to 0. While OXXX's value may be zero now, using the named
constant is more robust.
Change-Id: Id9147ed4c1b97d658d30a2f778f876b7867006b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/261857
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
debugCachedWork and all of its dependent fields and code were added to
aid in debugging issue #27993. Now that the source of the problem is
known and mitigated (via the extra work check after STW in gcMarkDone),
these extra checks are no longer required and simply make the code more
difficult to follow.
Remove it all.
Updates #27993
Change-Id: I594beedd5ca61733ba9cc9eaad8f80ea92df1a0d
Reviewed-on: https://go-review.googlesource.com/c/go/+/262350
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Currently, there are several panics in token that simply say "illegal!". This CL
adds the values.
This is valuable when the token call is wrapped under several layers and you
can't easily see which value is being passed to token.
Change-Id: Ib04b55cafcd9b9ec6820dcf416fc4d49afaea15f
Reviewed-on: https://go-review.googlesource.com/c/go/+/262017
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Jean de Klerk <deklerk@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Add support of internal linking on darwin/arm64 (macOS).
Still incomplete. Pure Go binaries work. Cgo doesn't. TLS is not
set up when cgo is not used (as before) (so asynchronous
preemption is not enabled).
Internal linking is not enabled by default but can be requested
via -ldflags=-linkmode=internal.
Updates #38485.
Change-Id: I1e0c81b6028edcb1ac26dcdafeb9bb3f788cf732
Reviewed-on: https://go-review.googlesource.com/c/go/+/261643
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This changes checks the signature generated during CreateCertificate
and returns an error if the verification fails. A benchmark is also
added. For RSA keys the delta looks to be insignificant, but for
ECDSA keys it introduces a much larger delta which is not ideal.
name old time/op new time/op delta
RSA_2048-8 1.38ms ± 6% 1.41ms ± 2% ~ (p=0.182 n=10)
ECDSA_P256-8 42.6µs ± 4% 116.8µs ± 4% +174.00% (p=0.000 n=1
Fixes#40458
Change-Id: I22827795bb9bb6868b4fa47391927db1d3bc19a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/259697
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Roland Shoemaker <roland@golang.org>
Follow-up for CL 261363 which had to retain the fat tz data format due
to failing test.
The reason for the failed tests was that when caching location data, the
extended time format past the end of zone transitions was not
considered. The respective change was introduced in (*Location).lookup
by CL 215539.
This slims down zoneinfo.zip (and thus also the embedded copy in
time/tzdata) by ~350KB.
Change-Id: I412f79de98ba45358b8696aca784999b3479135e
Reviewed-on: https://go-review.googlesource.com/c/go/+/261877
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Node type has shortcuts to access bool and int Values:
func (n *Node) Int64() int64
for n.Val().U.(*Mpint).Int64()
func (n *Node) Bool() bool
for n.Val().U.(bool)
I was convinced we didn't have one for string literal nodes, until I
noticed that we do, it's just called strlit, it's not a method, and
it's later in the file:
func strlit(n *Node) string
This change, for consistency:
- Renames strlit to StringVal and makes it a *Node method
- Renames Bool and Int64 to BoolVal and Int64Val
- Moves StringVal near the other two
Change-Id: I18e635384c35eb3a238fd52b1ccd322b1a74d733
Reviewed-on: https://go-review.googlesource.com/c/go/+/261361
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Setting inittrace=1 causes the runtime to emit a single line to standard error for
each package with init work, summarizing the execution time and memory allocation.
The emitted debug information for init functions can be used to find bottlenecks
or regressions in Go startup performance.
Packages with no init function work (user defined or compiler generated) are omitted.
Tracing plugin inits is not supported as they can execute concurrently. This would
make the implementation of tracing more complex while adding support for a very rare
use case. Plugin inits can be traced separately by testing a main package importing
the plugins package imports explicitly.
$ GODEBUG=inittrace=1 go test
init internal/bytealg @0.008 ms, 0 ms clock, 0 bytes, 0 allocs
init runtime @0.059 ms, 0.026 ms clock, 0 bytes, 0 allocs
init math @0.19 ms, 0.001 ms clock, 0 bytes, 0 allocs
init errors @0.22 ms, 0.004 ms clock, 0 bytes, 0 allocs
init strconv @0.24 ms, 0.002 ms clock, 32 bytes, 2 allocs
init sync @0.28 ms, 0.003 ms clock, 16 bytes, 1 allocs
init unicode @0.44 ms, 0.11 ms clock, 23328 bytes, 24 allocs
...
Inspired by stapelberg@google.com who instrumented doInit
in a prototype to measure init times with GDB.
Fixes#41378
Change-Id: Ic37c6a0cfc95488de9e737f5e346b8dbb39174e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/254659
Trust: Martin Möhrmann <moehrmann@google.com>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This CL adds support of PIE internal linking on darwin/amd64.
This is also preparation for supporting internal linking on
darwin/arm64 (macOS), which requires PIE for everything.
Updates #38485.
Change-Id: I2ed58583dcc102f5e0521982491fc7ba6f2754ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/261642
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
"aliased" is the function responsible for detecting whether we can
turn "a, b = x, y" into just "a = x; b = y", or we need to pre-compute
y and save it in a temporary variable because it might depend on a.
It currently has two issues:
1. It suboptimally treats assignments to blank as writes to heap
memory. Users generally won't write "_, b = x, y" directly, but it
comes up a lot in generated code within the compiler.
This CL changes it to ignore blank assignments.
2. When deciding whether the assigned variable might be referenced by
pointers, it mistakenly checks Class() and Name.Addrtaken() on "n"
(the *value* expression being assigned) rather than "a" (the
destination expression).
It doesn't appear to result in correctness issues (i.e.,
incorrectly reporting no aliasing when there is potential aliasing),
due to all the (overly conservative) rewrite passes before code
reaches here. But it generates unnecessary code and could have
correctness issues if we improve those other passes to be more
aggressive.
This CL fixes the misuse of "n" for "a" by renaming the variables
to "r" and "l", respectively, to make their meaning clearer.
Improving these two cases shaves 4.6kB of text from cmd/go, and 93kB
from k8s.io/kubernetes/cmd/kubelet:
text data bss dec hex filename
9732136 290072 231552 10253760 9c75c0 go.before
9727542 290072 231552 10249166 9c63ce go.after
97977637 1007051 301344 99286032 5eafc10 kubelet.before
97884549 1007051 301344 99192944 5e99070 kubelet.after
While here, this CL also collapses "memwrite" and "varwrite" into a
single variable. Logically, they're detecting the same thing: are we
assigning to a memory location that a pointer might alias. There's no
need for two variables.
Updates #6853.
Updates #23017.
Change-Id: I5a307b8e20bcd2196e85c55eb025d3f01e303008
Reviewed-on: https://go-review.googlesource.com/c/go/+/261677
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
We generally don't care about errors in resolving a repo if the result
we're looking for is already in the module cache. Moreover, we can
avoid some expense in initializing the repo if all of the methods we
plan to call on it hit in the cache — especially when using
GOPROXY=direct.
This also incidentally fixes a possible (but rare) bug in Download:
we had forgotten to reset the downloaded file in case the Zip method
returned an error after writing a nonzero number of bytes.
For #37438
Change-Id: Ib64f10f763f6d1936536b8e1f7d31ed1b463e955
Reviewed-on: https://go-review.googlesource.com/c/go/+/259158
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously, ImportMissingError said
"cannot find module providing package …"
even when we didn't even attempt to find such a module.
Now, we write "no module requirement provides package …"
when we did not attempt to identify a suitable module,
and suggest either 'go mod tidy' or 'go get -d' as appropriate.
Fixes#41576
Change-Id: I979bb999da4066828c54d99a310ea66bb31032ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/258298
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Formatter is mentioned further down, but it's helpful
to add it amongst the verbs and flags.
Background: I spent a while puzzling how "%+v" prints
a stack trace for github.com/pkg/errors when this isn't
documented under 'flags'.
Change-Id: Ic70145902a36780147dedca568b3cf482974fc38
GitHub-Last-Rev: 6571b499f2
GitHub-Pull-Request: golang/go#39860
Reviewed-on: https://go-review.googlesource.com/c/go/+/240000
Reviewed-by: Rob Pike <r@golang.org>
Trust: Rob Pike <r@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
In CL 240065 we changed it to set to FlagTextAddr. Normally it
is the address of the first function, except on plan9/amd64
where, as FlagTextAddr is not aligned, it is rounded up. Set it
to the actual text start address.
Fixes#41137.
Change-Id: I1bba67f5eb4e24d9f745a11350fc999ff48bff45
Reviewed-on: https://go-review.googlesource.com/c/go/+/261644
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
We are converting from using error-prone ad-hoc syntax // +build lines
to less error-prone, standard boolean syntax //go:build lines.
The timeline is:
Go 1.16: prepare for transition
- Builds still use // +build for file selection.
- Source files may not contain //go:build without // +build.
- Builds fail when a source file contains //go:build lines without // +build lines. <<<
Go 1.17: start transition
- Builds prefer //go:build for file selection, falling back to // +build
for files containing only // +build.
- Source files may contain //go:build without // +build (but they won't build with Go 1.16).
- Gofmt moves //go:build and // +build lines to proper file locations.
- Gofmt introduces //go:build lines into files with only // +build lines.
- Go vet rejects files with mismatched //go:build and // +build lines.
Go 1.18: complete transition
- Go fix removes // +build lines, leaving behind equivalent // +build lines.
This CL provides part of the <<< marked line above in the Go 1.16 step:
rejecting files containing //go:build but not // +build.
For #41184.
Change-Id: I29b8a789ab1526ab5057f613d5533bd2060ba9cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/240600
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We are converting from using error-prone ad-hoc syntax // +build lines
to less error-prone, standard boolean syntax //go:build lines.
The timeline is:
Go 1.16: prepare for transition
- Builds still use // +build for file selection.
- Source files may not contain //go:build without // +build.
- Builds fail when a source file contains //go:build lines without // +build lines. <<<
Go 1.17: start transition
- Builds prefer //go:build for file selection, falling back to // +build
for files containing only // +build.
- Source files may contain //go:build without // +build (but they won't build with Go 1.16).
- Gofmt moves //go:build and // +build lines to proper file locations.
- Gofmt introduces //go:build lines into files with only // +build lines.
- Go vet rejects files with mismatched //go:build and // +build lines.
Go 1.18: complete transition
- Go fix removes // +build lines, leaving behind equivalent // +build lines.
This CL provides part of the <<< marked line above in the Go 1.16 step:
rejecting files containing //go:build but not // +build.
Reject any //go:build comments found after actual assembler code
(include #include etc directives), because the go command itself
doesn't read that far.
For #41184.
Change-Id: Ib460bfd380cce4239993980dd208afd07deff3f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/240602
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We are converting from using error-prone ad-hoc syntax // +build lines
to less error-prone, standard boolean syntax //go:build lines.
The timeline is:
Go 1.16: prepare for transition
- Builds still use // +build for file selection.
- Source files may not contain //go:build without // +build.
- Builds fail when a source file contains //go:build lines without // +build lines. <<<
Go 1.17: start transition
- Builds prefer //go:build for file selection, falling back to // +build
for files containing only // +build.
- Source files may contain //go:build without // +build (but they won't build with Go 1.16).
- Gofmt moves //go:build and // +build lines to proper file locations.
- Gofmt introduces //go:build lines into files with only // +build lines.
- Go vet rejects files with mismatched //go:build and // +build lines.
Go 1.18: complete transition
- Go fix removes // +build lines, leaving behind equivalent // +build lines.
This CL provides part of the <<< marked line above in the Go 1.16 step:
rejecting files containing //go:build but not // +build.
The standard go command checks only consider the top of the file.
This compiler check, along with a separate go vet check for ignored files,
handles the remainder of the file.
For #41184.
Change-Id: I014006eebfc84ab5943de18bc90449e534f150a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/240601
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Make ctxt.shouldBuild return multiple values
instead of modifying *sawBinaryOnly in place.
Also give it a table-driven test.
Cleanup in preparation for boolean expressions,
but nice even if those don't end up happening.
Change-Id: Ibb78b0080070deafac7299a6de87ab8bebeb702d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240598
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This cgo warning shows up when running "go test" in cmd/fix:
warning: no cgo types: exit status 1
(It may show up at other times too.)
Warnings belong on standard error, and while we're here,
make it say where it came from.
Change-Id: I3eaba592a219cc6abf2d584762374f9d6ec5135e
Reviewed-on: https://go-review.googlesource.com/c/go/+/240597
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This makes the changes to the file easier to explain.
Not all the changes may come from the fixers directly,
if the file is not gofmt-ed already.
Change-Id: I81776da446a34a1239a3130317d2aae1437d61a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/240555
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Show constraint-ignored non-.go files in go list, as Package.IgnoredOtherFiles
(same as go/build's IgnoredOtherFiles).
Pass full list of ignored files to vet, to help buildtag checker.
For #41184.
Change-Id: I749868de9082cbbc1efbc59370783c8c82fe735f
Reviewed-on: https://go-review.googlesource.com/c/go/+/240553
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Just like it is useful to report ignored .go files,
it is also useful to report ignored non-.go files.
Also, remove _* and .* files from IgnoredGoFiles.
The fact that they were there at all was a mistake.
This list is for files being ignored due to build constraints.
Change-Id: Ie08252dde9f56bda08647e7ebeab7906e9271c54
Reviewed-on: https://go-review.googlesource.com/c/go/+/240551
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
- For "if" statements without a condition, provide a BadExpr rather than nil
(clients expect IfStmt.Cond != nil since the parser is taking care of
reporting a missing condition).
- For 3-index slice expressions, also provide BadExpr where an index is
required but missing.
- Declare a parser-local error method to hide the embedded error method
so we don't use it by mistake.
Accidentally found while adjusting prototype parser to work for generics.
Change-Id: Iacc211cc60869be05efe9ae630d65dff1dac00a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/261218
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
go test runs a limited number of vet checks by default.
In the standard library, we run more, both to get additional checking
for the standard library and to get experience with whether to enable
any others by default.
One that experience has shown us should not be enabled by default
is go vet -unreachable. When you are testing, it is common to want to
put an early return or a panic into code to bypass a section of code.
That often causes unreachable code. It's incredibly frustrating if the
result is an "unreachable code" error that keeps your test from completing.
Change-Id: Ib194e87759eb65f5a193d771a9880b38d2fd3ba9
Reviewed-on: https://go-review.googlesource.com/c/go/+/240550
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Currently on darwin, when a symbol needs to be exported, we
export it both statically and dynamically. The dynamic export is
unnecessary for some symbols. Only export the necessary ones.
For special runtime C symbols (e.g. crosscall2), they used to be
exported dynamically, and we had a special case for pclntab to
not include those symbols (otherwise, when the dynamic linker
dedup them, the pclntab entries end up pointing out of the
module's address space). This CL changes it to not export those
symbols, and remove the special case.
Change-Id: I2ab40630742d48a09b86ee150aa5f1f7002b134d
Reviewed-on: https://go-review.googlesource.com/c/go/+/261497
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Add note about using per-use seeds.
Delete "collision-resistant but" in:
> The hash functions are collision-resistant but not cryptographically secure.
"Collision-resistant" has a precise cryptographic meaning that is
incompatible with "not cryptographically secure".
All that is really meant by it here here is "it's a good hash function",
which should be established already.
Also delete:
> The hash value of a given byte sequence is consistent within a
> single process, but will be different in different processes.
This was added for its final clause in response to #37040,
but "The hash value of a given byte sequence" is by design not a
concept in this package. Only "... of a given seed and byte sequence".
And seeds cannot be shared between processes, so again by design
you can't even set up the appropriate first half of the sentence
to say the second half.
Change-Id: I2c02bee0e804ef3b120cb4752bf89e60f3f5ff5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255968
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This allows multiline constructs like:
{{"hello" |
printf}}
Now that unclosed actions can span multiple lines,
track and report the start of the action when reporting errors.
Also clean up a few "unexpected <error message>" to be just "<error message>".
Fixes#29770.
Change-Id: I54c6c016029a8328b7902a4b6d85eab713ec3285
Reviewed-on: https://go-review.googlesource.com/c/go/+/254257
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
When a module author retracts a version, the go command should act as
if it doesn't exist unless it's specifically requested.
When converting a revision to a version, we should ignore tags for
retracted versions. For example, if the tag v1.0.0 is retracted, and
branch B points to the same revision, we should convert B to a
pseudo-version, not v1.0.0. Similarly, if B points to a commit after
v1.0.0, we should not use v1.0.0 as the base; we can use an earlier
non-retracted tag or no base.
Fixes#41700
Change-Id: Ia596b05b0780e5acfe6616a04e94d24bd342fbae
Reviewed-on: https://go-review.googlesource.com/c/go/+/261079
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Currently, mhdr/methods is emitted with the same len/cap. There's no way
to distinguish between exported and non-exported methods statically.
This CL splits mhdr/methods into two parts, use "len" for number of
exported methods, and "cap" for all methods. This fixes the bug in
issue #22075, which intends to return the number of exported methods but
currently return all methods.
Note that with this encoding, we still can access either
all/exported-only/non-exported-only methods:
mhdr[:cap(mhdr)] // all methods
mhdr // exported methods
mhdr[len(mhdr):cap(mhdr)] // non-exported methods
Thank to Matthew Dempsky (@mdempsky) for suggesting this encoding.
Fixes#22075
Change-Id: If662adb03ccff27407d55a5578a0ed05a15e7cdd
Reviewed-on: https://go-review.googlesource.com/c/go/+/259237
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
On macOS, we can do "go build", can exec, and have the source
tree available, so we can enable more tests.
Skip ones that don't work. Most of them are due to that it
requires external linking (for now) and some tests don't work
with external linking (e.g. runtime deadlock detection). For
them, helper functions CanInternalLink/MustInternalLink are
introduced. I still want to have internal linking implemented,
but it is still a good idea to identify which tests don't work
with external linking.
Updates #38485.
Change-Id: I6b14697573cf3f371daf54b9ddd792acf232f2f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/260719
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
We lost a sign extension that was necessary. The nonnegative comparison
didn't have the correct extension on it. If the larger constant is
positive, but its shorter sign extension is negative, the rule breaks.
Fixes#41872
Change-Id: I6592ef103f840fbb786bf8cb94fd8804c760c976
Reviewed-on: https://go-review.googlesource.com/c/go/+/260701
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
This brings over the architectures that the gofrontend knows about.
This permits using the main cgo tool for those architectures,
as cgo can be used with -godefs without gc support.
This will help add golang.org/x/sys/unix support for other architectures.
For #37443
Change-Id: I63632b9c5139e71b9ccab8edcc7acdb464229b74
Reviewed-on: https://go-review.googlesource.com/c/go/+/260657
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Updated cmd/pprof.objTool.Disasm to accept
an additional bool param introduced in
https://github.com/google/pprof/pull/520 to support
intel syntax in the assembly report.
Returns an error if the intelSyntax param is set. We use
src/cmd/internal/objfile to disassemble and print assembly
so I am not sure if it is relevant, and if so, how.
Fixes#38802
Updates #36905
Change-Id: Iae2b4322404f232196705f05210f00e2495588d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/248499
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Prior to this commit, the profiling code had a sleep() function that
waits and unblocks on either time.After() or a channel provided by an
http.CloseNotifier derived from a supplied http.ResponseWriter.
According to the documentation, http.CloseNotifier is deprecated:
Deprecated: the CloseNotifier interface predates Go's context package.
New code should use Request.Context instead.
This patch does just that -- sleep() now takes an *http.Request and uses
http.Request.Context() to signal when a request has been cancelled.
Change-Id: I98702314addf494f5743a4f99172dc607389dbb8
GitHub-Last-Rev: c1e37a03ca
GitHub-Pull-Request: golang/go#41756
Reviewed-on: https://go-review.googlesource.com/c/go/+/259157
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This change makes go env -w check if GOTMPDIR is an absolute path.
If GOTMPDIR is not an absolute and not existing path there will be an
error at every `work.Builder.Init()`. If `go env` has `-u/-w` as
argument `work.Builder.Init()` is not called.
`go env -w GOTMPDIR=` work in the same way as `go env -u GOTMPDIR`.
Fixes#40932
Change-Id: I6b0662302eeace7f20460b6d26c6e59af1111da2
Reviewed-on: https://go-review.googlesource.com/c/go/+/250198
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
The implementation has been ported from reflect, but to avoid
introducing a dependency on strconv, Kind.String() falls back to
"invalid" if the Kind is unknown rather than "kind" + strconv.Itoa(int(k))
Fixes#39286
Change-Id: I82277242a6c41d0146dabd9d20339fe72d562500
Reviewed-on: https://go-review.googlesource.com/c/go/+/235522
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
On iOS, when running under lldb, we install xx_cgo_panicmem as
EXC_BAD_ACCESS handler so we can get a proper Go panic for
SIGSEGV. Only build it on iOS.
Updates #38485.
Change-Id: I801c477439e05920a4bb8fdf5eae6f4923ab8274
Reviewed-on: https://go-review.googlesource.com/c/go/+/259440
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently we don't use sigaltstack on darwin/arm64, as is not
supported on iOS. However, it is supported on macOS. Use it.
(iOS remains unchanged.)
Change-Id: Icc154c5e2edf2dbdc8ca68741ad9157fc15a72ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/256917
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
There is no correctness reason to zero out the w.bytes array in (w
*huffmanBitWriter).reset, since w.nbytes is correctly set to zero. The elements of
the bytes array are always written sequentially, with nbytes indicating how many
elements have been written, and are only read up to the current value of nybytes.
We have a pprof profile of a web server that compresses its request/responses, and
the zeroing in reset() is taking up 2.6% of the CPU time of the server (and could
be causing more slowdowns elsewhere due to its effects on the cache). This
overhead may be showing up especially because there are many request/responses
that are all fairly small.
I'm not sure if the zeroing of the bytes array was intended as extra protection of
data across reset uses in the same program, but no protection is needed as long as
the huffman_bit_writer code remains correct.
Change-Id: I67f2b2f56cff9dcc38d8fc0aea885bb010aeedbf
Reviewed-on: https://go-review.googlesource.com/c/go/+/258577
Run-TryBot: Dan Scales <danscales@google.com>
Run-TryBot: Joe Tsai <joetsai@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Klaus Post <klauspost@gmail.com>
Reviewed-by: Joe Tsai <joetsai@google.com>
Trust: Joe Tsai <joetsai@google.com>
Trust: Dan Scales <danscales@google.com>
This CL adds basic support for listing packages with overlays.
The new cmd/go/internal/fs package adds an abstraction for communicating
with the file system that will open files according to their overlaid paths,
and provides functions to override those in the build context to open
overlaid files. There is also some support for executing builds on packages
with overlays. In cmd/go/internal/work.(*Builder).build, paths are mapped
to their overlaid paths before they are given as arguments to tools.
For #39958
Change-Id: I5ec0eb9ebbca303e2f1e7dbe22ec32613bc1fd17
Reviewed-on: https://go-review.googlesource.com/c/go/+/253747
Trust: Michael Matloob <matloob@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Two part fix:
1) bring the type "correction" forward from a later CL in the expand calls series
2) when a leaf-selwect is rewritten in place, update the type (it might have been
changed by the type correction in 1).
Fixes#41736.
Change-Id: Id097efd10481bf0ad92aaead81a7207221c144b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/259203
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Support for GO386=387 is being dropped in Go 1.16. There
is no need for the target to be available for testing on
the master branch (where Go 1.16 development is ongoing).
For #40255.
Change-Id: I4a4ee80b0c0a535b6b0b246fe991f26964eb07ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/257963
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Mobile targets are not supported by misc-compile trybots, as tracked in
golang.org/issue/25963, and need to be filtered out. The buildall.bash
script was created in CL 9438, back when it was a single all-compile
builder, and it was easier to filter out mobile targets in the script
than to come up with a pattern that matches all non-mobile targets.
As of CL 254740, all mobile targets (Android and iOS) have unique GOOS
values. That makes it it easy to filter them out in x/build/dashboard.
This was done in CL 258057. As a result, it's now viable to simplify
this script and perform all misc-compile target selection in x/build,
rather than having it spread it across two places.
Also, as of CL 10750, the all-compile builder has turned into multiple
misc-compile builders, so update the script description accordingly.
Updates #41610.
Change-Id: I1e33260ac18cf0a70bb68cd8e3db5587100c7e87
Reviewed-on: https://go-review.googlesource.com/c/go/+/257962
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Most of the cmd/go tests build the cmd/go binary and run that binary to
test it, but TestAbsolutePath used the GOROOT's cmd/go instead, which
makes debugging confusing and means that make.bash has to be run in each
iteration cycle. Update TestAbsolutePath to use the same go binary as
the rest of the cmd/go tests.
Change-Id: Ib4e8ae707b66f1f75ceb346b98358f5604fd28c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/256979
Trust: Michael Matloob <matloob@golang.org>
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
ARM64 used to require that all assembly frame sizes were of the form
16*N+8 because ARM64 requires 16-byte SP alignment and the assembler
added an 8 byte LR slot. This made all of the runtime.call* frame
sizes wonky. The assembler now rounds up the frame size appropriately
after adding any additional slots it needs, so this is no longer
necessary.
This CL cleans up the frame sizes of these functions so they look the
way you'd expect and match all other architectures.
Change-Id: I47819092296b8983c43eadf2e66c7c1e0d518555
Reviewed-on: https://go-review.googlesource.com/c/go/+/259448
Trust: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Currently, runtime.call16 is defined and used only on 32-bit
architectures, while 64-bit architectures all start at call32 and go
up from there. This led to unnecessary complexity because call16's
prototype needed to be in a different file, separate from all of the
other call* prototypes, which in turn led to it getting out of sync
with the other call* prototypes. This CL adds call16 on 64-bit
architectures, bringing them all into sync, and moves the call16
prototype to live with the others.
Prior to CL 31655 (in 2016), call16 couldn't be implemented on 64-bit
architectures because it needed at least four words of argument space
to invoke "callwritebarrier" after copying back the results. CL 31655
changed the way call* invoked the write barrier in preparation for the
hybrid barrier; since the hybrid barrier had to be invoked prior to
copying back results, it needed a different solution that didn't reuse
call*'s stack space. At this point, call16 was no longer a problem on
64-bit, but we never added it. Until now.
Change-Id: Id10ade0e4f75c6ea76afa6229ddaee2b994c27dd
Reviewed-on: https://go-review.googlesource.com/c/go/+/259339
Trust: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The signature of call16 is currently missing the "typ" parameter. This
CL fixes this. This wasn't caught by vet because call16 is defined by
macro expansion (see #17544), and we didn't notice the mismatch with
the other call* functions because call16 is defined only on 32-bit
architectures and lives alone in stubs32.go.
Unfortunately, this means its GC signature is also wrong: the "arg"
parameter is treated as a scalar rather than a pointer, so GC won't
trace it and stack copying won't adjust it. This turns out to matter
in exactly one case right now: on 32-bit architectures (which are the
only architectures where call16 is defined), a stack-allocated defer
of a function with a 16-byte or smaller argument frame including a
non-empty result area can corrupt memory if the deferred function
grows the stack and is invoked during a panic. Whew. All other current
uses of reflectcall pass a heap-allocated "arg" frame (which happens
to be reachable from other stack roots, so tracing isn't a problem).
Curiously, in 2016, the signatures of all call* functions were wrong
in exactly this way. CL 31654 fixed all of them in stubs.go, but
missed the one in stubs32.go.
Fixes#41795.
Change-Id: I31e3c0df201f79ee5707eeb8dc4ff0d13fc10ada
Reviewed-on: https://go-review.googlesource.com/c/go/+/259338
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This change clarifies the usage of the SET type name suffix. Previously
the documentation was somewhat confusing about where the suffix should
be used, and when used what it applied to. For instance the previous
language could be interpreted such that []exampleSET would be parsed as
a SEQUENCE OF SET, which is incorrect as the SET suffix only applies to
slice types, such as type exampleSET []struct{} which is parsed as a
SET OF SEQUENCE.
Change-Id: I74201d9969f931f69391c236559f66cb460569ec
GitHub-Last-Rev: d0d2ddc587
GitHub-Pull-Request: golang/go#38543
Reviewed-on: https://go-review.googlesource.com/c/go/+/229078
Trust: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
This change renames mustHeapAlloc to heapAllocReason, and changes it
to return the reason why the argument must escape, so we don't have to
re-deduce it in its callers just to print the escape reason. It also
embeds isSmallMakeSlice body in heapAllocReason, since the former was
only used by the latter, and deletes isSmallMakeSlice.
An outdated TODO to remove smallintconst, which the TODO claimed was
only used in one place, was also removed, since grepping shows we
currently call smallintconst in 11 different places.
Change-Id: I0bd11bf29b92c4126f5bb455877ff73217d5a155
Reviewed-on: https://go-review.googlesource.com/c/go/+/258678
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Handling ast.GenDecls while typechecking is repetitive, and a source of
diffs compared to typechecking using the cmd/compile/internal/syntax
package, which unpacks declaration groups into individual declarations.
Refactor to extract the logic for walking declarations. This introduces
a new AST abstraction: types.decl, which comes at some minor performance
cost. However, if we are to fully abstract the AST we will be paying
this cost anyway, and benchmarking suggests that the cost is negligible.
Change-Id: If73c30c3d08053ccf7bf21ef886f0452fdbf142e
Reviewed-on: https://go-review.googlesource.com/c/go/+/256298
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
Previously by default, we extracted modules to a temporary directory,
then renamed it into place. This failed with ERROR_ACCESS_DENIED on
Windows if another process (usually an anti-virus scanner) opened
files in the temporary directory.
Since Go 1.15, users have been able to set
GODEBUG=modcacheunzipinplace=1 to opt into new behavior: we extract
modules at their final location, and we create and later delete a
.partial file to prevent the directory from being used if we crash.
.partial files are recognized by Go 1.14.2 and later.
With this change, the new behavior is the only behavior.
modcacheunzipinplace is no longer recognized.
Fixes#36568
Change-Id: Iff19fca5cd6eaa3597975a69fa05c4cb1b834bd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/258798
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This was useful for debugging failures occurring during make.bash.
The added flush also ensures that any hints in the GOSSAFUNC output
are flushed before fatal exit.
The environment variable GOSSADIR specifies where the SSA html debugging
files should be placed. To avoid collisions, each one is written into
the [package].[functionOrMethod].html, where [package] is the filepath
separator separated package name, function is the function name, and method
is either (*Type).Method, or Type.Method, as appropriate. Directories
are created as necessary to make this work.
Change-Id: I420927426b618b633bb1ffc51cf0f223b8f6d49c
Reviewed-on: https://go-review.googlesource.com/c/go/+/252338
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Currently on 32-bit systems 8-byte fields in a struct have an alignment
of 4 bytes, which means that atomic instructions may fault. This issue
is tracked in #36606.
Our current workaround is to allocate memory and put any such atomically
accessed fields at the beginning of the object. This workaround fails
because the tiny allocator might not align the object right. This case
specifically only happens with 12-byte objects because a type's size is
rounded up to its alignment. So if e.g. we have a type like:
type obj struct {
a uint64
b byte
}
then its size will be 12 bytes, because "a" will require a 4 byte
alignment. This argument may be extended to all objects of size 9-15
bytes.
So, make this workaround work by specifically aligning such objects to 8
bytes on 32-bit systems. This change leaves a TODO to remove the code
once #36606 gets resolved. It also adds a test which will presumably no
longer be necessary (the compiler should enforce the right alignment)
when it gets resolved as well.
Fixes#37262.
Change-Id: I3a34e5b014b3c37ed2e5e75e62d71d8640aa42bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/254057
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
A recent change to improve shifts was generating some
invalid cases when the rule was based on an AND. The
extended mnemonics CLRLSLDI and CLRLSLWI only allow
certain values for the operands and in the mask case
those values were not being checked properly. This
adds a check to those rules to verify that the
'b' and 'n' values used when an AND was part of the rule
have correct values.
There was a bug in some diag messages in asm9. The
message expected 3 values but only provided 2. Those are
corrected here also.
The test/codegen/shift.go was updated to add a few more
cases to check for the case mentioned here.
Some of the comments that mention the order of operands
in these extended mnemonics were wrong and those have been
corrected.
Fixes#41683.
Change-Id: If5bb860acaa5051b9e0cd80784b2868b85898c31
Reviewed-on: https://go-review.googlesource.com/c/go/+/258138
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Includes a few tweaks to Value.copyOf(a) (make it a no-op for
a self-copy) and new pattern hack "___" (3 underscores) is
like ellipsis, except the replacement doesn't need to have
matching ellipsis/underscores.
Moved the arg-length check in generated pattern-matching code
BEFORE the args are probed, because not all instances of
variable length OpFoo will have all the args mentioned in
some rule for OpFoo, and when that happens, the compiler
panics without the early check.
Change-Id: I66de40672b3794a6427890ff96c805a488d783f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/247537
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This change incorporates the decision that it should be possible to
run call expansion relatively late in the optimization chain, so that
(1) calls themselves can be exposed to useful optimizations
(2) the effect of selectors on aggregates is seen at the rewrite,
so that assignment of parts into registers is less complicated
(at least I hope it works that way).
That means that selectors feeding into SelectN need to be processed,
and Make* feeding into call parameters need to be processed.
This does however require that call expansion run before decompose
builtins.
This doesn't yet handle rewrites of strings, slices, interfaces,
and complex numbers.
Passes run.bash and race.bash
Change-Id: I71ff23d3c491043beb30e926949970c4f63ef1a4
Reviewed-on: https://go-review.googlesource.com/c/go/+/245133
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TestBenchmark doesn't use the -bench flag, so that it can format custom
output -- the number of checked lines per second. This is a barrier both
to discoverability, and to piping benchmark output into analysis tools
such as benchstat.
Using testing.B.ReportMetric and a bit of manual timing, we can achieve
similar results while conforming to normal benchmark output. Do this,
and rename the test func to BenchmarkCheck (for symmetry with
TestCheck).
Change-Id: Ie8f2259c1ca9e6986f0137287acf8eb2843f96b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/257958
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
2 conflicts, that make sense.
src/cmd/internal/obj/objfile.go
src/cmd/link/internal/loader/loader.go
Change-Id: Ib224e2d248cb568fa1e888af79dd908b2f5e05ff
1.Revise ambiguous comments: "all current buckets" means buckets in hmap.buckets, actually current bucket and all the overflow buckets connected to it are full
2.All the pointer address add use src/runtime/stubs.go:add, keep the code style uniform
Change-Id: Idc7224dbe6c391e1b03bf5d009c3734bc75187ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/257979
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Extends the IA5String encoding restrictions that are currently applied
to name constraints to dNSName, rfc822Name, and
uniformResourceIdentifier elements of the SAN. The utility function
isIA5String is updated to use unicode.MaxASCII rather than utf8.RuneSelf
as it is somewhat more readable.
Certificates that include these badly encoded names do exist, but are
exceedingly rare. zlint and other linters enforce this encoding and
searching censys.io reveals only three currently trusted certificates
with this particular encoding issue.
Fixes#26362
Change-Id: I7a4f3e165a1754e5b4bfaeabc03e01eb7367f3c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/235078
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Originally, zeroExtendAndCopy is used to pad src with leading zeros and
copy the padded src into the destination. It is no longer needed after
CL 230397 introduced FillBytes. We can simply use that and remove the
zeroExtendAndCopy function. It is cleaner and reduces some allocation.
In addition, this patch tries to avoid calling hashToInt function in
both Sign and Verify function so some allocation is reduced.
Benchmarks:
name old alloc/op new alloc/op delta
SignP256-8 1.60kB ± 0% 1.49kB ± 0% -7.23% (p=0.000 n=20+20)
SignP384-8 1.74kB ± 0% 1.59kB ± 0% -8.50% (p=0.000 n=20+18)
VerifyP256-8 176B ± 0% 0B -100.00% (p=0.000 n=20+20)
KeyGeneration-8 640B ± 0% 640B ± 0% ~ (all equal)
name old allocs/op new allocs/op delta
SignP256-8 22.0 ± 0% 17.0 ± 0% -22.73% (p=0.000 n=20+20)
SignP384-8 22.0 ± 0% 17.0 ± 0% -22.73% (p=0.000 n=20+20)
VerifyP256-8 7.00 ± 0% 0.00 -100.00% (p=0.000 n=20+20)
KeyGeneration-8 13.0 ± 0% 13.0 ± 0% ~ (all equal)
Change-Id: Ic4c95191eded55deb3420d97db501689f3b173c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/232297
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Filippo Valsorda <filippo@golang.org>
'go install pkg@version' runs without a main module or a module root
directory. The -modfile flag cannot be used to set the module root
directory or to substitute a different go.mod file.
This error won't be reported if -modfile is set in
GOFLAGS. Unsupported flags there are generally ignored.
For #40276
Change-Id: I0b39b1fa9184c15c6e863b647d43c328710920f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/258297
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
If vdso is disabled, the goruntime calls gettimeofday from vsyscall,
but if vsyscall is disabled too, all golang binaries crash:
SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xffffffffff600000} ---
killed by SIGSEGV (core dumped) ++
vsyscall doesn't work as it was designed for a long time due to security
reasons and now vsyscall is a little more expensive than real syscalls:
https://github.com/torvalds/linux/commit/5cec93c216db
This patch reworks the code to call syscalls if the vdso library isn't
available.
Change-Id: I16cbf3f49871bea91e26af1f49aa0ae2fbd3a01d
GitHub-Last-Rev: 1d133cd30a
GitHub-Pull-Request: golang/go#41681
Reviewed-on: https://go-review.googlesource.com/c/go/+/257982
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Pratt <mpratt@google.com>
Similar to how we report initialization loops in initorder.go and type
alias loops in typecheck.go, this CL updates align.go to warn about
invalid recursive types. The code is based on the loop code from
initorder.go, with minimal changes to adapt from detecting
variable/function initialization loops to detecting type declaration
loops.
Thanks to Cuong Manh Le for investigating this, helping come up with
test cases, and exploring solutions.
Fixes#41575
Updates #41669.
Change-Id: Idb2cb8c5e1d645e62900e178fcb50af33e1700a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/258177
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
When building a x509 chain the algorithm currently looks for parents
that have a subject key identifier (SKID) that matches the child
authority key identifier (AKID), if it is present, and returns all
matches. If the child doesn't have an AKID, or there are no parents
with matching SKID it will instead return all parents that have a
subject DN matching the child's issuer DN. Prioritizing AKID/SKID
matches over issuer/subject matches means that later in buildChains we
have to throw away any pairs where these DNs do not match. This also
prevents validation when a child has a SKID with two possible parents,
one with matching AKID but mismatching subject DN, and one with a
matching subject but missing AKID. In this case the former will be
chosen and the latter ignored, meaning a valid chain cannot be built.
This change alters how possible parents are chosen. Instead of doing a
two step search it instead only consults the CertPool.byName subject DN
map, avoiding issues where possible parents may be shadowed by parents
that have SKID but bad subject DNs. Additionally it orders the list of
possible parents by the likelihood that they are in fact a match. This
ordering follows this pattern:
* AKID and SKID match
* AKID present, SKID missing / AKID missing, SKID present
* AKID and SKID don't match
In an ideal world this should save a handful of cycles when there are
multiple possible matching parents by prioritizing parents that have
the highest likelihood. This does diverge from past behavior in that
it also means there are cases where _more_ parents will be considered
than in the past. Another version of this change could just retain the
past behavior, and only consider parents where both the subject and
issuer DNs match, and if both parent and child have SKID and AKID also
compare those, without any prioritization of the candidate parents.
This change removes an existing test case as it assumes that the
CertPool will return a possible candidate where the issuer/subject DNs
do not match.
Fixes#30079
Change-Id: I629f579cabb0b3d0c8cae5ad0429cc5a536b3e58
Reviewed-on: https://go-review.googlesource.com/c/go/+/232993
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
Currently, in the linker's deadcode pass, when an interface type
is live, the linker thinks all its methods are live, and uses
them to match methods on concrete types. The interface method may
never be used, though.
This CL changes it to only keep used interface methods, for
matching concrete type methods. To do that, when an interface
method is used, the compiler generates a mark relocation. The
linker uses the marker relocations to mark used interface
methods, and only the used ones.
binary size before after
cmd/compile 18887400 18812200
cmd/go 13470652 13470492
Change-Id: I3cfd9df4a53783330ba87735853f2a0ec3c42802
Reviewed-on: https://go-review.googlesource.com/c/go/+/256798
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
In the method table, the method's code pointer is stored as an
offset from the start of the text section. Currently, for an
unreachable method, the offset is left as 0, which resolves to
the start of the text section at run time. It is possible that
there is valid code there. If an unreachable method is ever
reached (due to a compiler or linker bug), the execution will
jump to a wrong location but may continue to run for a while,
until it fails with a seemingly unrelated error.
This CL changes it to use -1 for unreachable method instead. At
run time this will resolve to an invalid address, which makes it
fail immediately if it is ever reached.
Change-Id: Ied6ed7f1833c4f3b991fdf55d8810d70d307b2e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/257203
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
A test that checks if "tls.(*Conn)" appears in any symbol's name.
tls.Conn is a type, so the string "tls.(*Conn)" can only appear
in the name of a method of Conn. But the test code doesn't use
any of the methods. Not sure why this needs to be live. In
particular, the linker is now able to prune all methods of Conn.
Remove this requirement. In fact, just drop the only_conn test
case, as simply allocating a type doesn't necessarily bring
anything live.
Change-Id: I754291b75d38e1465b5291b4dea20806615d21b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/257973
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The function takes five 24-bit chunks from the hash, resulting in 120
bits. When base-64 encoded, this results in a 20-byte output string,
which is confirmed by "var dst [chunks * 4]byte".
It seems like the documented math could have been written for a previous
implementation with shorter hashes, using 4 chunks instead of 5, as then
the math checks out.
Since this code has been working correctly for over three years, let's
fix the documentation to reflect the code.
Change-Id: I9e908e6bafb5dcc1e3c23915e2b6c8843ed444d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/257646
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The linker prunes methods that are not directly reachable if the
receiver type is never converted to interface. Currently, this
"never" is too strong: it is invalidated even if the interface
conversion is in an unreachable function. This CL improves it by
only considering interface conversions in reachable code. To do
that, we introduce a marker relocation R_USEIFACE, which marks
the target symbol as UsedInIface if the source symbol is reached.
binary size before after
cmd/compile 18897528 18887400
cmd/go 13607372 13470652
Change-Id: I66c6b69eeff9ae02d84d2e6f2bc7f1b29dd53910
Reviewed-on: https://go-review.googlesource.com/c/go/+/256797
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
As part of type checking make's arguments, we were converting untyped
float and complex constant arguments to integers. However, we were
doing this without concern for whether the argument was a declared
constant. Thus a call like "make([]T, n)" could change n from an
untyped float or untyped complex to an untyped integer.
The fix here is to simply change checkmake to not call SetVal, which
will be handled by defaultlit anyway. However, we also need to
properly return the defaultlit result value to the caller, so
checkmake's *Node parameter is also changed to **Node.
Fixes#41680.
Change-Id: I858927a052f384ec38684570d37b10a6906961f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/257966
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
When explaining why the slice from a make() call escapes for the -m -m
message, we print "non-const size" if any one of Isconst(n.Left) and
Isconst(n.Right) return false; but for OMAKESLICE nodes with no cap,
n.Right is nil, so Isconst(n.Right, CTINT) will be always false.
Only call Isconst on n.Right if it's not nil.
Fixes#41635
Change-Id: I8729801a9b234b68ae40adad64d66fa7653adf09
Reviewed-on: https://go-review.googlesource.com/c/go/+/257641
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
ENOTSUP was used as a signaling error in the custom implementation of
syscall.Getwd to fall back to the slow algorithm. Since CL 257637 Getwd
directly calls the respective function from libSystem.dylib which can no
longer return ENOTSUP.
Change-Id: I8e65e42b3ea069bf78969a29f2af1c55552e2949
Reviewed-on: https://go-review.googlesource.com/c/go/+/257644
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This CL revises the document of File.Fd that explicitly points
its user to runtime.SetFinalizer where contains the information
that a file descriptor could be closed in a finalizer and therefore
causes a failure in syscall.Write if runtime.KeepAlive is not invoked.
The CL also suggests an alternative of File.Fd towards File.SyscallConn.
Fixes#41505
Change-Id: I6816f0157add48b649bf1fb793cf19dcea6894b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/256899
Reviewed-by: Rob Pike <r@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Directly wrap the getcwd implementation provided by libSystem.dylib on
darwin and use it to implement Getwd like on the BSDs. This allows to
drop the custom implementation using getAttrList and to merge the
implementation of Getwd for darwin and the BSDs in syscall_bsd.go.
Same as CL 257497 did for golang.org/x/sys/unix
Change-Id: If30390c4c17cd463bb8fdcb5465f40d6fa11f391
Reviewed-on: https://go-review.googlesource.com/c/go/+/257637
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Pick up GOOS=ios changes.
This is done by
cd $GOROOT/src
go get -d golang.org/x/net@latest
go mod tidy
go mod vendor
go get -d golang.org/x/sys@latest
go mod tidy
go mod vendor
cd $GOROOT/src/cmd
go get -d golang.org/x/sys@latest
go mod tidy
go mod vendor
Updates #38485.
Change-Id: Ic2b54febb1f851814c9d76c4b55a8837ac4779f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/257618
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
acquireLockRank and releaseLockRank are called from nosplit context, and
thus must be nosplit.
lockWithRank, unlockWithRank, and lockWithRankMayAcquire are called from
spittable context, and thus don't strictly need to be nosplit.
The stated reasoning for making these functions nosplit is to avoid
re-entrant calls due to a stack split on function entry taking a lock.
There are two potential issues at play here:
1. A stack split on function entry adds a new lock ordering edge before
we (a) take lock l, or (b) release lock l.
2. A stack split in a child call (such as to lock2) introduces a new
lock ordering edge _in the wrong order_ because e.g., in the case of
lockWithRank, we've noted that l is taken, but the stack split in
lock2 actually takes stack split locks _before_ l is actually locked.
(1) is indeed avoided by marking these functions nosplit, but this is
really just a bit of duct tape that generally has no effect overall. Any
earlier call can have a stack split and introduce the same new edge.
This includes lock/unlock which are not nosplit!
I began this CL as a change to extend nosplit to lock and unlock to try
to make this mitigation more effective, but I've realized that as long
as there is a _single_ nosplit call between a lock and unlock, we can
end up with the edge. There seems to be few enough cases without any
calls that is does not seem worth the extra cognitive load to extend
nosplit throughout all of the locking functions.
(2) is a real issue which would cause incorrect ordering, but it is
already handled by switching to the system stack before recording the
lock ordering. Adding / removing nosplit has no effect on this issue.
Change-Id: I94fbd21b2bf928dbf1bf71aabb6788fc0a012829
Reviewed-on: https://go-review.googlesource.com/c/go/+/254367
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Michael Pratt <mpratt@google.com>
The rules for go:notinheap were recently tweaked to disallow stack
allocation (CL 249917). This CL updates the documentation about
go:notinheap in runtime/HACKING.md.
Change-Id: Ibca5d9b9d02e1c22c6af1d303aa84c6303a86d92
Reviewed-on: https://go-review.googlesource.com/c/go/+/257357
Trust: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
We grow the backing store on append by 2x for small sizes and 1.25x
for large sizes. The threshold we use for picking the growth factor
used to depend on the old length, not the old capacity. That's kind of
unfortunate, because then doing append(s, 0, 0) and append(append(s,
0), 0) do different things. (If s has one more spot available, then
the former expression chooses its growth based on len(s) and the
latter on len(s)+1.) If we instead use the old capacity, we get more
consistent behavior. (Both expressions use len(s)+1 == cap(s) to
decide.)
Fixes#41239
Change-Id: I40686471d256edd72ec92aef973a89b52e235d4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/257338
Trust: Keith Randall <khr@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
The CL 249758 added `FMOVQ $vcon, Vd` instruction and assembler used
128-bit simd literal-loading to load `$vcon` from pool into 128-bit vector
register `Vd`. Because Go does not have 128-bit integers for now, the
assembler will report an error of `immediate out of range` when
assembleing `FMOVQ $0x123456789abcdef0123456789abcdef, V0` instruction.
This patch lets 128-bit integers take two 64-bit operands, for the high
and low parts separately and adds `VMOVQ $hi, $lo, Vd` instruction to
move `$hi<<64+$lo' into 128-bit register `Vd`.
In addition, this patch renames `FMOVQ/FMOVD/FMOVS` ops to 'VMOVQ/VMOVD/VMOVS'
and uses them to move 128-bit, 64-bit and 32-bit constants into vector
registers, respectively
Update the go doc.
Fixes#40725
Change-Id: Ia3c83bb6463f104d2bee960905053a97299e0a3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/255900
Trust: fannie zhang <Fannie.Zhang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The 387 port needs to load a floating-point control word from a
global location to implement float32 arithmetic.
When compiling with -pie, loading that control word clobbers an
integer register. If that register had something important in it, boom.
Fix by using LEAL to materialize the address of the global location
first. LEAL with -pie works because the destination register is
used as the scratch register.
387 support is about to go away (#40255), so this will need to be
backported to have any effect.
No test. I have one, but it requires building with -pie, which
requires cgo. Our testing infrastructure doesn't make that easy.
Not worth it for a port which is about to vanish.
Fixes#41503
Change-Id: I140f9fc8fdce4e74a52c2c046e2bd30ae476d295
Reviewed-on: https://go-review.googlesource.com/c/go/+/257277
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Keith Randall <khr@golang.org>
In CL 255718 the -S=2 assembly output was enhanced to dump symbol
ABIs. This patch fixes a bug in that CL: when dumping the relocations
on a symbol, we were dumping the symbol's ABI as opposed to the
relocation target symbol's ABI.
Change-Id: I134128687757f549fa37b998cff1290765889140
Reviewed-on: https://go-review.googlesource.com/c/go/+/257202
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Other test flags passed to the test binary, such as -run or -count, are
equally pointless when -c or -i are used, since the test binary is never
run. However, custom flags in that scenario are far more likely to be
due to human error, such as:
# note the "ldflags" typo, which silently did nothing
go test -c -lflags=-w
Instead, make this scenario error. It seems unlikely that anyone is
using -c along with intended custom-defined test flags, and if they are,
removing those extra flags that do nothing is probably a good idea
anyway.
We don't add this restriction for the flags defined in 'go help
testflag', since they are far less likely to be typos or unintended
mistakes. Another reason not to do that change is that other commands
similarly silently ignore no-op flags, such as:
# -d disables the build, so -ldflags is never used
go get -d -ldflags=-w
Fixes#39484.
Change-Id: I6ba2f6866562fe8f8fceaf4cd862d874bf5cd978
Reviewed-on: https://go-review.googlesource.com/c/go/+/237697
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
If a signal is sent to t.signal before the panic is triggered,
a panicking test may end up with "warning: no tests to run" because
the tRunner that invokes the test in t.Run calls runtime.Goexit on
panic, which causes the panicking test not be recorded in runTests.
Send the signal if and only if there is no panic.
Fixes#41479
Change-Id: I812f1303bfe02c443a1902732e68d21620d6672e
Reviewed-on: https://go-review.googlesource.com/c/go/+/256098
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Bryan C. Mills <bcmills@google.com>
CL 250357 exported net.ErrClosed to allow more reliable detection
of closed network connection errors. Use that error in crypto/tls
as well.
The error message is changed from "tls: use of closed connection"
to "use of closed network connection", so the code that detected such
errors by looking for that text in the error message will need to be
updated to use errors.Is(err, net.ErrClosed) instead.
Fixes#41066
Change-Id: Ic05c0ed6a4f57af2a0302d53b00851a59200be2e
Reviewed-on: https://go-review.googlesource.com/c/go/+/256897
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Katie Hockman <katie@golang.org>
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
The IndexString implementation in the bytealg package requires that
the string passed into it be in the range '2 <= len(s) <= MaxLen'
where MaxLen may be any value (including 0).
CL 156998 added calls to bytealg.IndexString where MaxLen was not
first checked. This led to an illegal instruction on s390x with
the vector facility disabled.
This CL guards the calls to bytealg.IndexString with a MaxLen check.
If the check fails then the code now falls back to the pre CL 156998
implementation (a loop over the runes in the string).
Since the MaxLen check is now in place the generic implementation is
no longer called so I have returned it to its original unimplemented
state.
In future we may want to drop MaxLen to prevent this kind of
confusion.
Fixes#41552.
Change-Id: Ibeb3f08720444a05c08d719ed97f6cef2423bbe9
Reviewed-on: https://go-review.googlesource.com/c/go/+/256717
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Keith Randall <khr@golang.org>
Introduce GOOS=ios for iOS systems. GOOS=ios matches "darwin"
build tag, like GOOS=android matches "linux" and GOOS=illumos
matches "solaris". Only ios/arm64 is supported (ios/amd64 is
not).
GOOS=ios and GOOS=darwin remain essentially the same at this
point. They will diverge at later time, to differentiate macOS
and iOS.
Uses of GOOS=="darwin" are changed to (GOOS=="darwin" || GOOS=="ios"),
except if it clearly means macOS (e.g. GOOS=="darwin" && GOARCH=="amd64"),
it remains GOOS=="darwin".
Updates #38485.
Change-Id: I4faacdc1008f42434599efb3c3ad90763a83b67c
Reviewed-on: https://go-review.googlesource.com/c/go/+/254740
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
QueryPackage was a wrapper around QueryPattern with extra validation,
called only once from within the same package. Most of that validation
was already performed much earlier, in (*loader).Load. Inline the
remaining validation and remove the needless indirection.
For #36460
Change-Id: I108a01d416197db8f886889554e07b29f0c37f3f
Reviewed-on: https://go-review.googlesource.com/c/go/+/256057
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This change replaces ImportPaths, ImportPathsQuiet, LoadALL, and
LoadVendor with a single LoadPackages function, with a LoadOpts struct
that more clearly documents the variations in behavior.
It also eliminates the cmd/go/internal/load.ImportPaths function,
which was undocumented and had only one call site (within its own
package).
The modload.LoadTests global variable is subsumed by a field in the
new LoadOpts struct, and is no longer needed for callers that invoke
LoadPackages directly. It has been (temporarily) replaced with a
similar global variable, load.ModResolveTests, which can itself be
converted to an explicit, local argument.
For #37438
For #36460
Updates #40775Fixes#26977
Change-Id: I4fb6086c01b04de829d98875db19cf0118d40f8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/255938
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Functions that require holding sched.lock now have an assertion.
A few places with missing locks have been fixed in this CL:
Additionally, locking is added around the call to procresize in
schedinit. This doesn't technically need a lock since the program is
still starting (thus no concurrency) when this is called, but lock held
checking doesn't know that.
Updates #40677
Change-Id: I198d3cbaa727f7088e4d55ba8fa989cf1ee8f9cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/250261
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
When lock ranking is enabled, we can now assert that lock preconditions
are met by checking that the caller holds required locks on function
entry.
This change adds the infrastructure to add assertions. Actual assertions
will be added for various locks in subsequent changes.
Some functions are protected by locks that are not directly accessible
in the function. In that case, we can use assertRankHeld to check that
any lock with the rank is held. This is less precise, but it avoids
requiring passing the lock into the functions.
Updates #40677
Change-Id: I843c6874867f975e90a063f087b6e2ffc147877b
Reviewed-on: https://go-review.googlesource.com/c/go/+/245484
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The Go 1.16 development cycle has started. This is the time to update
all golang.org/x/... module versions that contribute packages to the
std and cmd modules in the standard library to latest master versions.
Those versions have already gone through code review, and now they
will undergo additional testing during the development period.
If there are new issues in these dependencies discovered, we have
development period to deal with that. We will do this update once
more at the end of the development cycle, by the code freeze, and
so doing it now will make that update smaller and safer.
Overall, this change will help us build confidence that the
Go 1.16 release and its selected dependencies will be robust.
Also increment the Go language version to 1.16 in standard library
go.mod files.
This change was created with a program from CL 256357 patch set 1
(which updates golang.org/x modules only) and the bundle tool at
CL 255053 patch set 1:
$ updatestd -goroot=$HOME/gotip -branch=master
> go version
go version devel +eda1d40544 Mon Sep 21 16:50:07 2020 +0000 darwin/amd64
> go env GOROOT
/Users/dmitshur/gotip
> go version -m /Users/dmitshur/go/bin/bundle
/Users/dmitshur/go/bin/bundle: go1.15.2
path golang.org/x/tools/cmd/bundle
mod golang.org/x/tools (devel) # CL 255053 PS 1
dep golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
dep golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
updating module cmd in /Users/dmitshur/gotip/src/cmd
skipping github.com/chzyer/logex (out of scope, it's not a golang.org/x dependency)
skipping github.com/chzyer/readline (out of scope, it's not a golang.org/x dependency)
skipping github.com/chzyer/test (out of scope, it's not a golang.org/x dependency)
skipping github.com/google/pprof (out of scope, it's not a golang.org/x dependency)
skipping github.com/ianlancetaylor/demangle (out of scope, it's not a golang.org/x dependency)
skipping github.com/yuin/goldmark (out of scope, it's not a golang.org/x dependency)
skipping rsc.io/pdf (out of scope, it's not a golang.org/x dependency)
> go mod edit -go=1.16
> go get -d golang.org/x/arch@b19915210f009e139b20abfd6a6052c7acc1f445 golang.org/x/crypto@5c72a883971a4325f8c62bf07b6d38c20ea47a6a golang.org/x/mod@ce943fd02449f621243c9ea6e64098e84752b92b golang.org/x/net@62affa334b73ec65ed44a326519ac12c421905e3 golang.org/x/sync@6e8e738ad208923de99951fe0b48239bfd864f28 golang.org/x/sys@af09f7315aff1cbc48fb21d21aa55d67b4f914c5 golang.org/x/text@a8b4671254579a87fadf9f7fa577dc7368e9d009 golang.org/x/tools@d647fc2532668b2b75a92f468487b8085e6ed58b golang.org/x/xerrors@5ec99f83aff198f5fbd629d6c8d8eb38a04218ca
go: golang.org/x/sys af09f7315aff1cbc48fb21d21aa55d67b4f914c5 => v0.0.0-20200918174421-af09f7315aff
go: golang.org/x/text a8b4671254579a87fadf9f7fa577dc7368e9d009 => v0.3.4-0.20200826142016-a8b467125457
go: golang.org/x/tools d647fc2532 => v0.0.0-20200918232735-d647fc253266
go: golang.org/x/net 62affa334b73ec65ed44a326519ac12c421905e3 => v0.0.0-20200904194848-62affa334b73
go: golang.org/x/crypto 5c72a883971a4325f8c62bf07b6d38c20ea47a6a => v0.0.0-20200820211705-5c72a883971a
go: golang.org/x/arch b19915210f009e139b20abfd6a6052c7acc1f445 => v0.0.0-20200826200359-b19915210f00
go: golang.org/x/xerrors 5ec99f83aff198f5fbd629d6c8d8eb38a04218ca => v0.0.0-20200804184101-5ec99f83aff1
> go mod tidy
> go mod vendor
updating module std in /Users/dmitshur/gotip/src
> go mod edit -go=1.16
> go get -d golang.org/x/crypto@5c72a883971a4325f8c62bf07b6d38c20ea47a6a golang.org/x/net@62affa334b73ec65ed44a326519ac12c421905e3 golang.org/x/sys@af09f7315aff1cbc48fb21d21aa55d67b4f914c5 golang.org/x/text@a8b4671254579a87fadf9f7fa577dc7368e9d009 golang.org/x/tools@d647fc2532668b2b75a92f468487b8085e6ed58b
go: golang.org/x/crypto 5c72a883971a4325f8c62bf07b6d38c20ea47a6a => v0.0.0-20200820211705-5c72a883971a
go: golang.org/x/text a8b4671254579a87fadf9f7fa577dc7368e9d009 => v0.3.4-0.20200826142016-a8b467125457
go: golang.org/x/sys af09f7315aff1cbc48fb21d21aa55d67b4f914c5 => v0.0.0-20200918174421-af09f7315aff
go: golang.org/x/tools d647fc2532 => v0.0.0-20200918232735-d647fc253266
> go mod tidy
> go mod vendor
updating bundles in /Users/dmitshur/gotip/src
> go generate -run=bundle std cmd
Other non-golang.org/x module dependencies (pprof and demangle)
still need to be updated in a future CL.
For #36905.
Change-Id: I83a350bf8714ebc249284c0d69abe4941700565e
Reviewed-on: https://go-review.googlesource.com/c/go/+/255860
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
For a common pattern of iterating only over top-level compilation units (CU)
Reader.SkipChildren has decode and meterialize all CU subentries just
to skip them, because DW_TAG_compile_unit does not have DW_AT_sibling.
However, CUs have total size encoded before the unit and we already parse them
and know all unit sizes.
Optimize Reader.SkipChildren to use that size when skipping CUs children.
This speeds up iteration over a 1.3GB object file from 7.5s to 0.73s.
Change-Id: I2a8f00955159b4bd13571409f4817805f934cb69
Reviewed-on: https://go-review.googlesource.com/c/go/+/256217
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Than McIntosh <thanm@google.com>
Currently, if make.bash is run with a GOOS or GOARCH that the
bootstrap toolchain doesn't support, it will print an ominous but
harmless warning like:
2020/09/21 09:05:27 unsupported GOARCH arm64
This comes from the invocation of "go version" to get the exact
bootstrap toolchain version.
Since the GOOS and GOARCH don't matter for this purpose, this CL
simply clears them on the invocation of the bootstrap toolchain's "go
version".
Fixes#41525.
Change-Id: I17d44eaafed9999b9fa7dcb9fb100b5fd5e554d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/256297
Trust: Austin Clements <austin@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
unlockf is called after the G is put into _Gwaiting, meaning another G
may have readied this one before unlockf is called.
This is implied by the current doc, but add additional notes to call out
this behavior, as it can be quite surprising.
Updates #40641
Change-Id: I60b1ccc6a4dd9ced8ad2aa1f729cb2e973100b59
Reviewed-on: https://go-review.googlesource.com/c/go/+/256058
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Currently activeStackChans is set before a goroutine blocks on a channel
operation in an unlockf passed to gopark. The trouble is that the
unlockf is called *after* the G's status is changed, and the G's status
is what is used by a concurrent mark worker (calling suspendG) to
determine that a G has successfully been suspended. In this window
between the status change and unlockf, the mark worker could try to
shrink the G's stack, and in particular observe that activeStackChans is
false. This observation will cause the mark worker to *not* synchronize
with concurrent channel operations when it should, and so updating
pointers in the sudog for the blocked goroutine (which may point to the
goroutine's stack) races with channel operations which may also
manipulate the pointer (read it, dereference it, update it, etc.).
Fix the problem by adding a new atomically-updated flag to the g struct
called parkingOnChan, which is non-zero in the race window above. Then,
in isShrinkStackSafe, check if parkingOnChan is zero. The race is
resolved like so:
* Blocking G sets parkingOnChan, then changes status in gopark.
* Mark worker successfully suspends blocking G.
* If the mark worker observes parkingOnChan is non-zero when checking
isShrinkStackSafe, then it's not safe to shrink (we're in the race
window).
* If the mark worker observes parkingOnChan as zero, then because
the mark worker observed the G status change, it can be sure that
gopark's unlockf completed, and gp.activeStackChans will be correct.
The risk of this change is low, since although it reduces the number of
places that stack shrinking is allowed, the window here is incredibly
small. Essentially, every place that it might crash now is replaced with
no shrink.
This change adds a test, but the race window is so small that it's hard
to trigger without a well-placed sleep in park_m. Also, this change
fixes stackGrowRecursive in proc_test.go to actually allocate a 128-byte
stack frame. It turns out the compiler was destructuring the "pad" field
and only allocating one uint64 on the stack.
Fixes#40641.
Change-Id: I7dfbe7d460f6972b8956116b137bc13bc24464e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/247050
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
In the current implementation, we can observe crashes after calling
debug.SetMaxStack and allocating a stack larger than 4GB since
stackalloc works with 32-bit sizes. To avoid this, we define an upper
limit as the largest feasible point we can grow a stack to and provide a
better error message when we get a stack overflow.
Fixes#41228
Change-Id: I55fb0a824f47ed9fb1fcc2445a4dfd57da9ef8d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/255997
Run-TryBot: Keith Randall <khr@golang.org>
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Trust: Giovanni Bajo <rasky@develer.com>
Reviewed-by: Keith Randall <khr@golang.org>
According to POSIX, there are three formats for TZ variable. When
it refers to timezone file, it should starts with a colon. This commit
removes the colon if it exists, so that it keeps compatible with both
the spec and the old behavior.
Change-Id: I30cfeaea530d24e174de309952338cb1146694a5
GitHub-Last-Rev: 11d83d11ca
GitHub-Pull-Request: golang/go#27570
Reviewed-on: https://go-review.googlesource.com/c/go/+/134217
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
In CL 231397, we stopped marking symbols' GoType reachable in
general, but not when -linkshared. It was left as a TODO. This CL
addresses it.
The problem was that the type names are mangled in the shared
library, so we need to mangle the name consistently in the
executable as well (regardless of whether the symbol is reachable
or not), so that the GCProg generation code can find the
corresponding symbol from the shared library.
Change-Id: I1040747402929a983ec581109f1681a77893682e
Reviewed-on: https://go-review.googlesource.com/c/go/+/255964
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
When we're building a panic that's triggered by a memory fault when
SetPanicOnFault has been called, include an Addr method. This
method reports the address at which the fault occurred.
Fixes#37023
RELNOTE=yes
Change-Id: Idff144587d6b75070fdc861a36efec76f4ec7384
Reviewed-on: https://go-review.googlesource.com/c/go/+/249677
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This is testing for the limited case of zero or one SSA-able results.
One regression is that the later expansion of "Dereference" into
Move into argument slots thwarts the
MOVE A -> B, MOVE B -> C
replaced-by
MOVE A -> B, MOVE A -> C
optimization; the second move is written instead as a Dereference at the
phase where the optimization occurs, and because the target of the
dereference is not visible in the dereference, it's not possible to verify
that A and B or A and C don't overlap in some peculiar way (and for results
fed to args, they can).
Regression is repaired in a later CL by changing when calls are expanded.
Change-Id: Ia0f48a9d483d5a54a99657a24b12b25b8edde55f
Reviewed-on: https://go-review.googlesource.com/c/go/+/242782
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
When we load module retractions from the latest version of a module,
it's possible that the latest version has a different module path than
the version we're loading. This can happen when a module is renamed or
a go.mod file is added for the first time.
We should not report an error in this case. Retractions should still
apply to old aliases of a module.
Fixes#41350
Change-Id: If1bc0b6b2b26fc7023e02fc211aa0cd8eb00796e
Reviewed-on: https://go-review.googlesource.com/c/go/+/255961
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
The linker prunes methods that are not directly reachable if the
receiver type is never converted to interface. A type can be
converted to interface using reflection through other types.
The linker already takes this into consideration but it missed
the case that the intermediate is a method descriptor. Handle
this case.
Change-Id: I590efc5da163c326db8d43583908a2ef67f65d9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255858
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
retsigerr was used to create error message for both wrong function
arguments and return arguments, so change its name to sigerr to reflect
that.
While at it, also add documentation for the wrong function arguments
case.
Passes toolstash-check.
Change-Id: I740c717ad38d4afab9e8c20f2e94579c8bca67ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/255240
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The revised test now checks that unsafe-uintptr correctly works for
variadic uintptr parameters too, and the CL corrects the code so this
code compiles again.
The pointers are still not kept alive properly. That will be fixed by
a followup CL. But this CL at least allows programs not affected by
that to build again.
Updates #24991.
Updates #41460.
Change-Id: If4c39167b6055e602213fb7522c4f527c43ebda9
Reviewed-on: https://go-review.googlesource.com/c/go/+/255877
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
When -S=2 is in effect for the compiler/assembler, include symbol ABI
values for defined symbols and relocations. This is intended to help
make it easier to distinguish between a symbol and its ABI wrapper.
Change-Id: Ifbf71372392075f15363b40e882b2132406b7d6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255718
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
Previously, modload imported load, but it mainly just did so in order
to install callbacks to the modload API. This was important during vgo
development, but there's no longer a strong reason to do this. Nothing
modload imports strongly depends on load, so there's little danger of
a dependency cycle.
This change deletes the callbacks in load and instead, makes load call
exported functions in modload directly. In the future, these functions
may have different signatures than their GOPATH counterparts.
Change-Id: Ifde5c3ffebd190b5bd184924ec447d272b936f27
Reviewed-on: https://go-review.googlesource.com/c/go/+/255719
Trust: Jay Conrod <jayconrod@google.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
//go:notinheap
type T int
type U T
We already correctly propagate the notinheap-ness of T to U. But we
have an assertion in the typechecker that if there's no explicit
//go:notinheap associated with U, then report an error. Get rid of
that error so that implicit propagation is allowed.
Adjust the tests so that we make sure that uses of types like U
do correctly report an error when U is used in a context that might
cause a Go heap allocation.
Fixes#41451
Update #40954
Update #41432
Change-Id: I1692bc7cceff21ebb3f557f3748812a40887118d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255637
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Set GO111MODULE=off explicitly in tests specific to GOPATH mode.
Added a go.mod file to other tests that assumed GOPATH mode.
Fixed an issue in the build metadata file generated in
modload/build.go, which did not end with a newline. This broke the
build_dash_x test, which expects to be able to run the script printed
by 'go build -x' to produce the same result. The script is broken if
the build metadata file doesn't end with a newline.
Change-Id: I59f2a492a9f5a66f6c4aa702f429909d5c5e815d
Reviewed-on: https://go-review.googlesource.com/c/go/+/255051
Run-TryBot: Jay Conrod <jayconrod@google.com>
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Trust: Jay Conrod <jayconrod@google.com>
This change adds rules to find pairs of instructions that can
be combined into a single shifts. These instruction sequences
are common in array addressing within loops. Improvements can
be seen in many crypto packages and the hash packages.
These are based on the extended mnemonics found in the ISA
sections C.8.1 and C.8.2.
Some rules in PPC64.rules were moved because the ordering prevented
some matching.
The following results were generated on power9.
hash/crc32:
CRC32/poly=Koopman/size=40/align=0 195ns ± 0% 163ns ± 0% -16.41%
CRC32/poly=Koopman/size=40/align=1 200ns ± 0% 163ns ± 0% -18.50%
CRC32/poly=Koopman/size=512/align=0 1.98µs ± 0% 1.67µs ± 0% -15.46%
CRC32/poly=Koopman/size=512/align=1 1.98µs ± 0% 1.69µs ± 0% -14.80%
CRC32/poly=Koopman/size=1kB/align=0 3.90µs ± 0% 3.31µs ± 0% -15.27%
CRC32/poly=Koopman/size=1kB/align=1 3.85µs ± 0% 3.31µs ± 0% -14.15%
CRC32/poly=Koopman/size=4kB/align=0 15.3µs ± 0% 13.1µs ± 0% -14.22%
CRC32/poly=Koopman/size=4kB/align=1 15.4µs ± 0% 13.1µs ± 0% -14.79%
CRC32/poly=Koopman/size=32kB/align=0 137µs ± 0% 105µs ± 0% -23.56%
CRC32/poly=Koopman/size=32kB/align=1 137µs ± 0% 105µs ± 0% -23.53%
crypto/rc4:
RC4_128 733ns ± 0% 650ns ± 0% -11.32% (p=1.000 n=1+1)
RC4_1K 5.80µs ± 0% 5.17µs ± 0% -10.89% (p=1.000 n=1+1)
RC4_8K 45.7µs ± 0% 40.8µs ± 0% -10.73% (p=1.000 n=1+1)
crypto/sha1:
Hash8Bytes 635ns ± 0% 613ns ± 0% -3.46% (p=1.000 n=1+1)
Hash320Bytes 2.30µs ± 0% 2.18µs ± 0% -5.38% (p=1.000 n=1+1)
Hash1K 5.88µs ± 0% 5.38µs ± 0% -8.62% (p=1.000 n=1+1)
Hash8K 42.0µs ± 0% 37.9µs ± 0% -9.75% (p=1.000 n=1+1)
There are other improvements found in golang.org/x/crypto which are all in the
range of 5-15%.
Change-Id: I193471fbcf674151ffe2edab212799d9b08dfb8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/252097
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
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Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
xtop holds package's top-level declaration statements, but OCLOSURE
only appears in expression contexts. xtop will instead hold the
synthetic ODCLFUNC representing OCLOSURE's function body.
This CL makes the loop consistent with the later phases that only look
for ODCLFUNC nodes in xtop.
Passes toolstash-check.
Change-Id: I852a10ef1bf75bb3351e3da0357ca8b2e26aec6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/255340
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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TryBot-Result: Go Bot <gobot@golang.org>
The existing translation assumes an in-memory return values, thus it returns
the address of the result(s). Most consumers immediately load from the
address to get the value, and in late call expansion that is the favored idiom,
and it is also the favored idiom when arguments and results use registers
instead of memory.
Change-Id: Ie0ccc70f399682a42509d847b330ef3956462d56
Reviewed-on: https://go-review.googlesource.com/c/go/+/240186
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
This is prerequisite to moving call expansion later into SSA,
and probably a good idea anyway. Passes tests.
This is the first minimal CL that does a 1-for-1 substitution
of *ssa.AuxCall for *obj.LSym. Next step (next CL) is to make
this change for all calls so that additional information can
be stored in AuxCall.
Change-Id: Ia3a7715648fd9fb1a176850767a726e6f5b959eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/237680
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
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Reviewed-by: Cherry Zhang <cherryyz@google.com>
"cannot assign to" compiler errors are very laconic: they never
explain why the lhs cannot be assigned to (with one exception, when
assigning to a struct field in a map).
This change makes them a little more specific, in two more cases: when
assigning to a string, or to a const; by giving a very brief reason
why the lhs cannot be assigned to.
Change-Id: I244cca7fc3c3814e00e0ccadeec62f747c293979
Reviewed-on: https://go-review.googlesource.com/c/go/+/255199
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
They can't reasonably be allocated on the heap. Not a huge deal, but
it has an interesting and useful side effect.
After CL 249917, the compiler and runtime treat pointers to
go:notinheap types as uintptrs instead of real pointers (no write
barrier, not processed during stack scanning, ...). That feature is
exactly what we want for cgo to fix#40954. All the cases we have of
pointers declared in C, but which might actually be filled with
non-pointer data, are of this form (JNI's jobject heirarch, Darwin's
CFType heirarchy, ...).
Fixes#40954
Change-Id: I44a3b9bc2513d4287107e39d0cbbd0efd46a3aae
Reviewed-on: https://go-review.googlesource.com/c/go/+/250940
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
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Trust: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The alias doesn't need to be marked go:notinheap. It gets its
notinheap-ness from the target type.
Without this change, the type alias test in the notinheap.go file
generates these two errors:
notinheap.go:62: misplaced compiler directive
notinheap.go:63: type nih must be go:notinheap
The first is a result of go:notinheap pragmas not applying
to type alias declarations.
The second is the result of then trying to match the notinheap-ness
of the alias and the target type.
Add a few more go:notinheap tests while we are here.
Update #40954
Change-Id: I067ec47698df6e9e593e080d67796fd05a1d480f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250939
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Keith Randall <khr@golang.org>
CL 249917 made the mspan in MSpanCountAlloc no longer stack-allocated
(for good reason), but then allocated an mspan on each call and did not
free it, resulting in a leak. That allocation was also not protected by
the heap lock, which could lead to data corruption of mheap fields and
the spanalloc.
To fix this, export some functions to allocate/free dummy mspans from
spanalloc (with proper locking) and allocate just one up-front for the
benchmark, freeing it at the end. Then, update MSpanCountAlloc to accept
a dummy mspan.
Note that we need to allocate the dummy mspan up-front otherwise we
measure things like heap locking and fixalloc performance instead of
what we actually want to measure: how fast we can do a popcount on the
mark bits.
Fixes#41391.
Change-Id: If6629a6ec1ece639c7fb78532045837a8c872c04
Reviewed-on: https://go-review.googlesource.com/c/go/+/255297
Run-TryBot: Michael Knyszek <mknyszek@google.com>
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Trust: Michael Knyszek <mknyszek@google.com>
Use a common runtime slicecopy function to copy strings or slices
into slices. This deduplicates similar code previously used in
reflect.slicecopy and runtime.stringslicecopy.
Change-Id: I09572ff0647a9e12bb5c6989689ce1c43f16b7f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/254658
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
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Trust: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
In https://golang.org/cl/221397 we made commands like "go version -v"
error, since both of the command's flags only make sense when arguments
follow them. Without arguments, the command only reports Go's own
version, and the flags are most likely a mistake.
However, the script below is entirely reasonable:
export GOFLAGS=-v # make all Go commands verbose
go version
go build
After the previous CL, "go version" would error. Instead, only error if
the flag was passed explicitly, and not via GOFLAGS.
The patch does mean that we won't error on "GOFLAGS=-v go version -v",
but that very unlikely false negative is okay. The error is only meant
to help the user not misuse the flags, anyway - it's not a critical
error of any sort.
To reuse inGOFLAGS, we move it to the base package and export it there,
since it's where the rest of the GOFLAGS funcs are.
Fixes#41264.
Change-Id: I74003dd25d94bacf9ac507b5cad778fd65233321
Reviewed-on: https://go-review.googlesource.com/c/go/+/254157
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This makes error reporting a bit more consistent for 'go mod'
subcommands. Most of these commands only work in module mode when a
go.mod file is present.
Setting modload.ForceUseModules reports an error when GO111MODULE=off.
Setting modload.RootMode to modload.NeedRoot reports an error when no
go.mod file is present.
Change-Id: I1daa8d2971cb8658e0c804765839d903734a412e
Reviewed-on: https://go-review.googlesource.com/c/go/+/254369
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Currently, there's awkward reentrancy issue with funccompile:
funccompile -> compile -> dtypesym -> geneq/genhash/genwrapper -> funccompile
Though it's not a problem at this moment, some attempts by @mdempsky to
move order/walk/instrument into buildssa was failed, due to SSA cache
corruption.
This commit fixes that reentrancy issue, by making generated functions
to be pumped through the same compile workqueue that normal functions
are compiled. We do this by adding them to xtop, instead of calling
funccompile directly in geneq/genhash/genwrapper. In dumpdata, we look
for uncompiled functions in xtop instead of compilequeue, then finish
compiling them.
Updates #38463Fixes#33485
Change-Id: Ic9f0ce45b56ae2ff3862f17fd979253ddc144bb5
Reviewed-on: https://go-review.googlesource.com/c/go/+/254617
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Keith Randall <khr@golang.org>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This allows the global initializers function to go through normal
mid-end optimizations (e.g., inlining, escape analysis) like any other
function.
Updates #33485.
Change-Id: I9bcfe98b8628d1aca09b4c238d8d3b74c69010a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/254839
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
funchdr and funcbody currently assume that either (1) Curfn == nil &&
dclcontext == PEXTERN, or (2) Curfn != nil && dclcontext == PAUTO.
This is a reasonable assumption during parsing. However, these
functions end up getting used in other contexts, and not all callers
are so disciplined about Curfn/dclcontext handling.
This CL changes them to save/restore arbitrary Curfn/dclcontext pairs
instead. This is necessary for the followup CL, which pushes fninit
earlier. Otherwise, Curfn/dclcontext fall out of sync, and funchdr
panics.
Passes toolstash-check.
Updates #33485.
Change-Id: I19b1be23db1bad6475345ae5c81bbdc66291a3a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/254838
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
This reverts CL 253037.
Reason for revert: The recommended way to check for a type of error is errors.As. API changes should also start with a proposal.
Change-Id: I62896717aa47ed491c2c4775d2b05d80e5e9cde3
Reviewed-on: https://go-review.googlesource.com/c/go/+/254837
Trust: Damien Neil <dneil@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This reverts CL 254537.
Reason for revert: Reason for revert: The recommended way to check for a type of error is errors.As. API changes should also start with a proposal.
Change-Id: I07c37428575e99c80b17525833a61831d10963bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/254857
Trust: Damien Neil <dneil@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Previously, it was impossible to call FailNow in a Cleanup.
Because it can terminate a panicking goroutine and cause its
parent hangs on t.signal channel. This CL sends the signal
in a deferred call to prevent the hang.
Fixes#41355
Change-Id: I4552d3a7ea763ef86817bf9b50c0e37fb34bf20f
Reviewed-on: https://go-review.googlesource.com/c/go/+/254637
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
As of CL 251159, when 'go list -deps std' is run within GOROOT/src, it
treats the vendored external dependencies as real module dependencies,
not standard-library "vendor/" packages (which still exist in that
case, but are treated as distinct packages outside the "std" module).
Fixes#41358
Updates #30241
Change-Id: Ic23eae9829d90e74a340d49ca9052e9191597410
Reviewed-on: https://go-review.googlesource.com/c/go/+/254738
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This CL ensures that responses served via CGI and FastCGI
have a Content-Type header based on the content of the
response if not explicitly set by handlers.
If the implementers of the handler did not explicitly
specify a Content-Type both CGI implementations would default
to "text/html", potentially causing cross-site scripting.
Thanks to RedTeam Pentesting GmbH for reporting this.
Fixes#40928
Fixes CVE-2020-24553
Change-Id: I82cfc396309b5ab2e8d6e9a87eda8ea7e3799473
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/823217
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/252179
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
CL 96455 brings CL 57753 to Windows
However, a path comparison within it was left unquoted.
If the Go source directory resides in a path containing whitespace,
the interpreter will compare against the first portion of the path string,
and treat the remainder as an expression.
This patch amends that.
For example, consider the path
`C:\Users\Dominic Della Valle\Projects\Go\goroot\src`
Issuing `make.bat` will print out `'Della' is not recognized as an internal or external command, operable program or batch file.` before proceeding.
Change-Id: Ifcec159baeec940c29c61aa721c64c13c6fd8c14
GitHub-Last-Rev: 809ddbb4db
GitHub-Pull-Request: golang/go#41319
Reviewed-on: https://go-review.googlesource.com/c/go/+/253898
Run-TryBot: Giovanni Bajo <rasky@develer.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Trust: Giovanni Bajo <rasky@develer.com>
CL 254397 attached OVARLIVE nodes to OCALLxxx nodes Nbody.
The NeedsWrapper flag is now redundant with n.Nbody.Len() > 0
condition, so use that condition instead and remove the flag.
Passes toolstash-check.
Change-Id: Iebc3e674d3c0040a876ca4be05025943d2b4fb31
Reviewed-on: https://go-review.googlesource.com/c/go/+/254398
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
So we can insert theses OVARLIVE nodes right after OpStaticCall in SSA.
This helps fixing issue that unsafe-uintptr arguments are not kept alive
during return statement, or can be kept alive longer than expected.
Fixes#24491
Change-Id: Ic04a5d1bbb5c90dcfae65bd95cdd1da393a66800
Reviewed-on: https://go-review.googlesource.com/c/go/+/254397
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Allows users to check:
errors.Is(err, &UnmarshalTypeError{})
errors.Is(err, &UnmarshalFieldError{})
errors.Is(err, &InvalidUnmarshalError{})
errors.Is(err, &UnsupportedValueError{})
errors.Is(err, &MarshalerError{})
which is the recommended way of checking for kinds of errors.
SyntaxError.Is was implemented in CL 253037.
As and Unwrap relevant methods will be added in future CLs.
Change-Id: I1f8a503b8fdc0f3afdfe9669a91f3af8d960e028
GitHub-Last-Rev: 930cda5384
GitHub-Pull-Request: golang/go#41360
Reviewed-on: https://go-review.googlesource.com/c/go/+/254537
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
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Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
We want to error early if GOFLAGS contains any flag that isn't known to
any cmd/go command. Thus, at init time we would recursively use VisitAll
on each of the flagsets to populate a map of all registered flags.
This was unfortunate, as populating said map constituted a whole 5% of
the run-time of 'go env GOARCH'. This is because VisitAll is pretty
expensive; it copies all the maps from the flagset's map to a slice,
sorts the slice, then does one callback per flag.
First, this was a bit wasteful. We only ever needed to query the
knownFlag map if GOFLAGS wasn't empty. If it's empty, there's no work to
do, thus we can skip the map populating work.
Second and most important, we don't actually need the map at all. A
flag.FlagSet already has a Lookup method, so we can simply recursively
call those methods for each flag in GOFLAGS. Add a hasFlag func to make
that evident.
This mechanism is different; its upfront cost is none, but it will
likely mean a handful of map lookups for each flag in GOFLAGS. However,
that tradeoff is worth it; we don't expect GOFLAGS to contain thousands
of flags. The most likely scenario is less than a dozen flags, in which
case constructing a "unified" map is not at all a net win.
One possible reason the previous mechanism was that way could be
AddKnownFlag. Thankfully, the one and only use of that API was removed
last year when Bryan cleaned up flag parsing in cmd/go.
The wins for the existing benchmark with an empty GOFLAGS are
significant:
name old time/op new time/op delta
ExecGoEnv-8 575µs ± 1% 549µs ± 2% -4.44% (p=0.000 n=7+8)
name old sys-time/op new sys-time/op delta
ExecGoEnv-8 1.69ms ± 1% 1.68ms ± 2% ~ (p=0.281 n=7+8)
name old user-time/op new user-time/op delta
ExecGoEnv-8 1.80ms ± 1% 1.66ms ± 2% -8.09% (p=0.000 n=7+8)
To prove that a relatively large number of GOFLAGS isn't getting
noticeably slower, we measured that as well, via benchcmd and GOFLAGS
containing 50 valid flags:
GOFLAGS=$(yes -- -race | sed 50q) benchcmd -n 500 GoEnvGOFLAGS go env GOARCH
And the result, while noisy, shows no noticeable difference (note that
it measures 3ms instead of 0.6ms since it's sequential):
name old time/op new time/op delta
GoEnvGOFLAGS 3.04ms ±32% 3.03ms ±35% ~ (p=0.156 n=487+481)
Finally, we've improved the existing Go benchmark. Now it's parallel,
and it also reports sys-time and user-time, which are useful metrics.
Change-Id: I9b4551415cedf2f819eb184a02324b8bd919e2bd
Reviewed-on: https://go-review.googlesource.com/c/go/+/248757
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
'go mod download' calls WriteGoMod once via modload.ListModules when
it loads the build list. This saves sums for go.mod files needed by
MVS, but the write occurs before any zip files are downloaded.
With this change, 'go mod download' calls WriteGoMod again (and thus,
modfetch.WriteGoSum) after downloading and verifying module zip files,
so the sums of the zip files will be saved, too.
Fixes#41341
Change-Id: I7d56754aa255256ed45fd93cb154c2e6ea5f45a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/254357
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
On darwin, we put read-only data in __TEXT segment on AMD64 in
exe (non-PIE) buildmode, and in __DATA on everywhere else. This
is not ideal: things in __DATA segment are not read-only, and
being mapped R/W may use more run-time resources.
In fact, newer darwin systems support a __DATA_CONST segment,
which the dynamic linker will map it read-only after applying
relocations. Use that.
Fixes#38830.
Change-Id: Ic281e6c6ca8ef5fec4bb7c5b71c50dd5393e78ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/253919
Reviewed-by: Than McIntosh <thanm@google.com>
When -mod=readonly is set, Import will now allow imports from
replacements without explicit requirements. With -mod=mod, this would
add a new requirement but does not trigger a module lookup, so it's
determinisitic.
Before reporting an error for an unknown import with -mod=readonly,
check whether the import is valid. If there's a typo in the import,
that's more relevant.
For #40728
Change-Id: I05e138ff76ba3d0eb2e3010c15589fa363deb8d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/253745
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Keep track of whether the -mod flag was set explicitly. When
-mod=readonly is the default, we'll want to adjust our error messages
if it's set explicitly.
Also, register the -mod, -modcacherw, and -modfile flags in functions
in internal/base instead of internal/work. 'go mod' commands that
don't load packages shouldn't depend on internal/work.
For #40728
Change-Id: I272aea9e19908ba37e151baac4ea8630e90f241f
Reviewed-on: https://go-review.googlesource.com/c/go/+/253744
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
In the deadcode pass, a type symbol may be marked twice, one
without UsedInIface, one with. For the second time, don't
update the Reachparent graph, so it only records the path of
the first time the symbol is reached. This ensures the
Reachparent graph is acyclic.
TODO: add a test. (This only affects GOEXPERIMENT=fieldtrack)
Change-Id: I68e8a1a69c3830bc8aee5df946151dc22dcb2b29
Reviewed-on: https://go-review.googlesource.com/c/go/+/254297
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
BenchmarkFullASCIIRune tests the performance of function utf8.FullRune,
which will be inlined in BenchmarkFullASCIIRune. Since the return value
of FullRune is not referenced, it will be removed as dead code.
This CL makes the FullRune functions return value referenced by a global
variable to avoid this point. In addition, this CL adds one more benchmark
to cover more code paths, and puts them together as sub benchmarks of
BenchmarkFullRune.
Change-Id: I6e79f4c087adf70e351498a4b58d7482dcd1ec4a
Reviewed-on: https://go-review.googlesource.com/c/go/+/233979
Run-TryBot: eric fang <eric.fang@arm.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
Enable VBSL, VBIT, VCMTST, VUXTL VUXTL2 and FMOVQ SIMD
instructions required by the issue #40725. And FMOVQ
instrucion is used to move a large constant to a Vn
register.
Add test cases.
Fixes#40725
Change-Id: I1cac1922a0a0165d698a4b73a41f7a5f0a0ad549
Reviewed-on: https://go-review.googlesource.com/c/go/+/249758
Reviewed-by: Cherry Zhang <cherryyz@google.com>
I found the control flow of this function a bit tricky to reason about
due to nesting and interaction between conditions and iteration. This
change factors out a helper function that can return early instead of
mixing conditionals and 'continue' statements.
Also remove the (unused) ModuleUsedDirectly function.
For #36460
Change-Id: I60a2a5a1b32989e5a17a14e1a8c858b280cda8f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/251998
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
With lazy loading, the “build list” can be refined as packages are loaded.
Rename functions that return the build list to more precisely describe
the set of modules returned by the call.
Also eliminate a redundant call to LoadBuildList (right before
ListModules, which itself begins with the same call).
For #36460
Change-Id: I0fc4f9dd7602e0df5e166e329ee5d516d810ca53
Reviewed-on: https://go-review.googlesource.com/c/go/+/249878
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
The new semantics of the "all" package pattern can be implemented
without actually changing module loading per se. This change
implements those semantics, so that the change can be decoupled from
the changes to the module requirement graph.
For #36460
Change-Id: I0ee8b17afa8b728dc470a42a540fcc01764a4442
Reviewed-on: https://go-review.googlesource.com/c/go/+/240623
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Due to a bug in CL 173017, if QueryPackages found multiple candidates
for the given package and *at least* one of those candidates was not
available to add, we would reject *all* such candidates — even those
that were still viable.
Now, we return the first viable candidate, and only return an error if
*no* candidate is viable given the current build list.
Fixes#41113
Change-Id: Idb2e77244be7c0f5dd511efb142c3059925d7336
Reviewed-on: https://go-review.googlesource.com/c/go/+/251446
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Fix a data race for clients that mutate requests after receiving a
response error which is caused by the writeLoop goroutine left
running, this can be seen on cancelled requests.
Fixes#37669
Change-Id: Ia4743c6b8abde3a7503de362cc6a3782e19e7f60
Reviewed-on: https://go-review.googlesource.com/c/go/+/251858
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
modload.Import previously performed two otherwise-separable tasks:
1. Identify which module in the build list contains the requested
package.
2. If no such module exists, search available modules to try to find
the missing package.
This change splits those two tasks into two separate unexported
functions, and reports import-resolution errors by attaching them to
the package rather than emitting them directly to stderr. That allows
'list' to report the errors, but 'list -e' to ignore them.
With the two tasks now separate, it will be easier to avoid the
overhead of resolving missing packages during lazy loading if we
discover that some existing dependency needs to be promoted to the top
level (potentially altering the main module's selected versions, and
thus suppling packages that were previously missing).
For #36460
Updates #26909
Change-Id: I32bd853b266d7cd231d1f45f92b0650d95c4bcbd
Reviewed-on: https://go-review.googlesource.com/c/go/+/251445
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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Reviewed-by: Michael Matloob <matloob@golang.org>
forceStdVendor was a special-case mechanism to allow Go contributors
to use vendored dependencies by default when working in GOROOT/src.
As of Go 1.14,¹ the 'go' command uses vendored dependencies by default
within all modules, so the 'std' and 'cmd' modules no longer need to
be special cases, and we can remove this special-case code.
¹ https://golang.org/doc/go1.14#vendor
Updates #33848
Updates #30241
Change-Id: Ib2fb5841c253113b17fa86a086ce85a22ac3d121
Reviewed-on: https://go-review.googlesource.com/c/go/+/251159
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
If the user requests the 'all' pattern in addition to explicit roots
outside of 'all', we should not load the transitive dependencies of
those explicit roots as if they were *in* 'all'. Without the '-test'
flag, we should not load test dependencies of any package outside of
'all'. Even *with* the '-test' flag, we should only load test
dependencies of the requested roots, not test dependencies of other
packages that happen to be imported by those roots.
More precise tracking of membership in 'all' will be important when we
implement lazy loading, because membership in 'all' determines which
module dependencies we will record in the main module's go.mod file.
This change also reduces reliance on global state, factors out the
loading process into several smaller functions, and sets us up to
reuse the 'go mod vendor' version of the 'all' pattern for lazy
loading.
For #36460Fixes#40799
Change-Id: I5ca21c86a860daee1316f732cea131a331d8ddf9
Reviewed-on: https://go-review.googlesource.com/c/go/+/240505
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
This avoids a deadlock on prof.signalLock between setcpuprofilerate
and cpuprof.add if a SIGPROF is delivered to the thread between the
call to setThreadCPUProfiler and acquiring prof.signalLock.
Fixes#41014
Change-Id: Ie825e8594f93a19fb1a6320ed640f4e631553596
Reviewed-on: https://go-review.googlesource.com/c/go/+/253758
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Both ReadMemStatsSlow and CheckScavengedBits iterate over the page
allocator's chunks but don't actually check if they exist. During the
development process the chunks index became sparse, so now this was a
possibility. If the runtime tests' heap is sparse we might end up
segfaulting in either one of these functions, though this will generally
be very rare.
The pattern here to return nil for a nonexistent chunk is also useful
elsewhere, so this change introduces tryChunkOf which won't throw, but
might return nil. It also updates the documentation of chunkOf.
Fixes#41296.
Change-Id: Id5ae0ca3234480de1724fdf2e3677eeedcf76fa0
Reviewed-on: https://go-review.googlesource.com/c/go/+/253777
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Pre-resolve package index references, so it doesn't need to do a
map lookup in every cross-package symbol reference resolution. It
increases the memory usage very slightly (O(# imported packages)).
Change-Id: Ia76c97ac51f1c2c2d5ea7ae34853850ec69ef0a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/253604
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This preserves zip sums when 'go get' is run on a module that does not
have a package in the root directory. The zip must be fetched to
determine whether the package should be loaded, so we already load and
verify the sum.
Note that 'go mod tidy' may still remove these sums, since they
aren't needed to load packages.
Fixes#41103
Change-Id: I78f10a25f0392461fdc98518a7c92a38ee3233c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/251880
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Currently, the statement:
go g(uintptr(f()))
gets rewritten into:
tmp := f()
newproc(8, g, uintptr(tmp))
runtime.KeepAlive(tmp)
which doesn't guarantee that tmp is still alive by time the g call is
scheduled to run.
This CL fixes the issue, by wrapping g call in a closure:
go func(p unsafe.Pointer) {
g(uintptr(p))
}(f())
then this will be rewritten into:
tmp := f()
go func(p unsafe.Pointer) {
g(uintptr(p))
runtime.KeepAlive(p)
}(tmp)
runtime.KeepAlive(tmp) // superfluous, but harmless
So the unsafe.Pointer p will be kept alive at the time g call runs.
Updates #24491
Change-Id: Ic10821251cbb1b0073daec92b82a866c6ebaf567
Reviewed-on: https://go-review.googlesource.com/c/go/+/253457
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It appears the machoCalcStart function is meant to align the
segment, but it doesn't. Replace it with an actual alignment
calculation. Also, use the alignment from the configuration,
instead of hardcode.
With this fix we could enable DWARF combining on macOS ARM64.
Change-Id: I19ec771b77d752b83a54c53b6ee65af78a31b8ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/253558
Reviewed-by: Than McIntosh <thanm@google.com>
In Mach-O DWARF combining, some code was written using reflection,
so it could support both 32-bit and 64-bit Mach-O files without
duplicating code. We no longer support 32-bit darwin platforms
now. 32-bit support can go. Rewrite it with direct field access,
for 64-bit only.
Change-Id: If1338c3cd37cecf603f4df0c6eb0c890eaebfe5f
Reviewed-on: https://go-review.googlesource.com/c/go/+/253557
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
On darwin, with external linking, the system linker produces STAB
(symbolic debugging) symbols in the binary's symbol table. These
include paths of the intermediate object files, like
<tmpdir>/go.o, which changes from run to run, making the build
non-reproducible.
Since we run dsymutil to produce debug info and combine them
back into the binary, we don't need those STAB symbols anymore.
Strip them after running dsymutil.
If DWARF is not enabled, we don't run dsymutil. We can pass
"-Wl,-S" to let the system linker not generate those symbols.
While here, also make it more consistent about DWARF combining.
Currently we only do DWARF combining on macOS/AMD64, when DWARF
is enabled. On ARM64, we run dsymutil, but then throw the result
away. This CL changes it to not run dsymutil (and strip) on
ARM64.
TODO: add a test. We don't do it here as it fails on some
(non-darwin) platforms.
Fixes#40979.
Change-Id: If770f7828cdb858857d6079e0585bf067f8f7a92
Reviewed-on: https://go-review.googlesource.com/c/go/+/250944
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The post-index offset of VLD[1-4]R instructions is decided by the
"size" field not "Q" field, the current assembler uses "Q" fileld
to check the correctness of post-index offset which is not correct.
This patch fixes it.
Fixes#40725
Change-Id: If1cde7f21c6b3ee0e491649eb567700bd1475c84
Reviewed-on: https://go-review.googlesource.com/c/go/+/249757
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The Value field of ast.BasicLit is a string field holding the literal
string. For CHARs and STRINGs, the BasicLit.Value literal includes
quotes, so to use the value in practise one will often need to Unquote
it.
Since this is a common gotcha (I've been bitten by this a few times),
document it, and suggest the use of the strconv.Unquote functions.
Fixes#39590
Change-Id: Ie3e13f5a2a71bb1b59e03bc5b3a16d8e2e7c01d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/244960
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
On Server.Shutdown, all idle connections are closed.
A caveat for new connections is that they are marked idle
after 5 seconds.
Previously new HTTP/2 connections were marked New, and after 5 seconds,
they would then become idle. With this change, we now mark HTTP/2
connections as Active to allow the proper shutdown sequence to occur.
Fixes#36946Fixes#39776
Change-Id: I31efbf64b9a2850ca544da797f86d7e1b3378e8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240278
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Updates x/net/http2 to git rev 62affa334b73ec65ed44a326519ac12c421905e3
x/net/http2: reject HTTP/2 Content-Length headers containing a sign
https://go-review.googlesource.com/c/net/+/236098/ (fixes#39017)
also updates the vendored version of golang.org/x/net by running
go get golang.org/x/net@62affa334b73ec65ed44a326519ac12c421905e3
go mod tidy
go mod vendor
go generate -run bundle net/http
Change-Id: I7ecfdb7644574c44c3616e3b47664eefd4c926f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/253238
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Ensures that calling TempDir() in either of Cleanup or Benchmark
doesn't cause test failures which were previously caused by the
created directory having been deleted after the first run, yet
we prevented the recreation of the directory due to our selection
of concurrency primitive sync.Once. This change recreates the
temporary directory if it doesn't exist, regardless of how
many times Cleanup and Benchmark are invoked.
Fixes#41062
Change-Id: I925d9f7207d7c369a193d1e17da7a59a586244a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/251297
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The linker assumed macOS is AMD64 (and 386 in the past). It
passes darwin/amd64-specific flags to the external linker when
building for macOS. They don't work for ARM64-based macOS. So
only pass them on AMD64.
Disable DWARF combining for macOS ARM64 for now. The generated
binary doesn't run. (TODO: fix.)
For macOS ARM64 port. External linking now works.
Change-Id: Iab53bc48f4fadd9b91de8898b4b450ea442667a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/253019
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The current implementation stores the comparison pseudo-ops of arm64
conditional instructions (CSEL/CSEL0) in Aux, this patch modifies it
and stores it in AuxInt, which can avoid the allocation.
Change-Id: I0b69e51f63acd84c6878c6a59ccf6417501a8cfc
Reviewed-on: https://go-review.googlesource.com/c/go/+/252517
Run-TryBot: fannie zhang <Fannie.Zhang@arm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This defines a macro for the regabi GOEXPERIMENT when assembling
runtime assembly code.
In general, assembly code will be shielded from the calling convention
change, but there is a small amount of runtime assembly that is going
to have to change. By defining a macro, we can easily make the small
necessary changes. The other option is to use build tags, but that
would require duplicating nontrivial amounts of unaffected code,
leading to potential divergence issues. (And unlike Go code, assembly
code can't depend on the compiler optimizing away branches on a
feature constant.) We consider the macro preferable, especially since
this is expected to be temporary as we transition to the new calling
convention.
Updates #40724.
Change-Id: I73984065123968337ec10b47bb12c4a1cbc07dc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/252258
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This is the "feature flag" for the register calling convention work
(though since this work is expected to extend over a few releases,
it's not version-prefixed). This will let us develop the register
calling convention on the main branch while maintaining an easy toggle
between the old and new ABIs.
Updates #40724.
Change-Id: I129c8d87d34e6fa0910b6fa43efb35b706021637
Reviewed-on: https://go-review.googlesource.com/c/go/+/252257
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The primary responsibility of declare() to associate a symbol (Sym) with
a declaration (Node), so "oldname" will work. Function literals are
anonymous, so their symbols does not need to be declared.
Passes toolstash-check.
Change-Id: I739b1054e3953e85fbd74a99148b9cfd7e5a57eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/249078
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
They are skipped while processing Func.Dcl anyway.
This CL does not pass toolstash-check, because it reduces the length
of Func.Dcl length, while that length is used to generate autotmp
variables name.
Change-Id: I408183e62ce6c34e5f04c89814ebb9570957e37b
Reviewed-on: https://go-review.googlesource.com/c/go/+/252418
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Fixes the file server to reject requests of the form:
"Range": "bytes=--N"
where "-N" is a negative suffix-length as designated by the
grammar in RFC 7233 Section 2.1, "Byte-Ranges", which specifies
that suffix-length MUST be of the form 1*DIGIT aka a non-negative digit.
Thus requests such as:
"Range": "bytes=--2"
will be rejected with a "416 Range Not Satisfiable" response.
Fixes#40940
Change-Id: I3e89f8326c14af30d8bdb126998a50e02ba002d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/252497
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
While debugging #40771, I realized that the chatty printer should only
ever print to a single io.Writer (normally os.Stdout). The other
Writer implementations in the chain write to local buffers, but if we
wrote a test's output to a local buffer, then we did *not* write it to
stdout and we should not store it as the most recently logged test.
Because the chatty printer should only ever print to one place, it
shouldn't receive an io.Writer as an argument — rather, it shouldn't
be used at all for destinations other than the main output stream.
On the other hand, when we flush the output buffer to stdout in the
top-level flushToParent call, it is important that we not allow some
other test's output to intrude between the test summary header and the
remainder of the test's output. cmd/test2json doesn't know how to
parse such an intrusion, and it's confusing to humans too.
No test because I couldn't reproduce the user-reported error without
modifying the testing package. (This behavior seems to be very
sensitive to output size and/or goroutine scheduling.)
Fixes#40771
Updates #38458
Change-Id: Ic19bf1d535672b096ba1c8583a3b74aab6d6d766
Reviewed-on: https://go-review.googlesource.com/c/go/+/249026
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Process may crash becaues acquireLockRank and releaseLockRank may
be called in nosplit context. With optimizations and inlining
disabled, these functions won't get inlined or have their morestack
calls eliminated.
Nosplit is not strictly required for lockWithRank, unlockWithRank
and lockWithRankMayAcquire, just keep consistency with lockrank_on.go
here.
Fixes#40843
Change-Id: I5824119f98a1da66d767cdb9a60dffe768f13c81
GitHub-Last-Rev: 38fd3ccf6e
GitHub-Pull-Request: golang/go#40844
Reviewed-on: https://go-review.googlesource.com/c/go/+/248878
Reviewed-by: Dan Scales <danscales@google.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
cgo effectively prepends -I${SRCDIR} to the header include path of all
preambles it processes, so when an #include <> matches a header file
both in the source directory and also another include directory, the
local copy will be used in preference.
This behaviour is surprising but unfortunately also longstanding and
relied upon by packages in the wild, so the best we can do is to
document it.
Fixes#41059
Change-Id: If6d2818294b2bd94ea0fe5fd6ce77e54b3e167a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/251758
Reviewed-by: Ian Lance Taylor <iant@golang.org>
I decided to add package and module diagrams to the test cases to make
them easier to follow.
While adding those diagrams, I noticed some strong similarities among
a couple of the graphs, so I consolidated those cases (and deleted the
redundant tests).
For #36460
Change-Id: Id6cd04fc871379b83851c2d1af89ea9296a0f3e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/251997
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
That test tested that import paths with non-ASCII unicode paths
were allowed by the Go command. Remove this test case because
golang.org/cl/251878 removes that support.
Also rewrite a test case in TestRepoRootForImportPath in the test
for cmd/go/internal/get to reflect that unicode directory names are now
disallowed.
Updates #29101
Change-Id: I669e220facd04fc82ccd05dd08e8f1ff4d48b1fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/252297
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Previously, if an example test invoked runtime.Goexit, it would
pass yet hang until a timeout, while regular tests that invoke
runtime.Goexit do fail. This change removes that inconsistent
behavior and makes such example tests fail, and panic with an
indication of having invoked runtime.Goexit.
Fixes#41084
Change-Id: I0ffa152204f2b1580f4d5d6961ba1ce6b13fc022
Reviewed-on: https://go-review.googlesource.com/c/go/+/251857
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The copy of CheckImportPath in path.go and the regular expression for github
repos in vcsPaths together allow import paths with unicode letters with import
paths. These all come from github repos with non-ASCII unicode letters
with paths in directories. This mainly shows up in GOPATH mode, but could
also show up in Module mode when getting a module in GOPROXY=direct mode.
We expect there to not be any significant affected users of this change--
an investingation of github repos that would produce import paths that
would comply with the copy CheckImportPaths that's being removed, but not
modload.CheckImportPaths only surfaced a handful of cases, all of which
seemed to be small test or demonstation repos. But this CL is being
submitted early in the cycle so that it can be backed out if need be.
Updates #29101
Change-Id: I719df4af5b318e1330e90d8a0bffe5bb8d816f4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/251878
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This pulls in golang.org/cl/250920 which rejects Windows shortnames as
path components in module.CheckImportPath (as is already done in
cmd/go/internal/get's copy of CheckImportPath). This will allow us to replace
the copy of CheckImportPath with the original.
This also pulls in golang.org/cl/250919 which rejects + in CheckPath and
CheckImportPath, and golang.org/cl/235597, which adds methods to the zip
package for gorelease, but shouldn't affect cmd.
This change also updates the cmd/go test case TestScript/mod_bad_filenames
to reflect that golang.org/x/mod/zip error messages now include filenames
for bad file names that can't be included in zip archives.
Updates #29101
Change-Id: I7f654325dc33b19bc9c6f77a56546747add5a47f
Reviewed-on: https://go-review.googlesource.com/c/go/+/251877
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Rather than probe and guess if sendfile will work inside ResponseWriter.ReadFrom(src),
this change fixes the underlying issue of starting to respond before src is readable
We'll no longer send a status OK if a header has not yet been written and reading
from src is destined to fail. This small change implicitly takes care of the need for
the server to sniff the response body to determine the Content-Type.
This allows splice to work on Linux when src is a socket or any non-regular file that's spliceable.
The extra read of 512 bytes may raise an objection, and that's fair, but
we're already swapping some syscall prep work for another and a read of
512 probably will not impact the overall performance. For shorter
bodies, there's likely less setup time. A little initial slop is not too
unusual in zero copy network code, and sometimes actually helps.
Fixes#40888
Change-Id: I4a8e2ad0ace1318bae66dae5671d06ea6d4838ed
GitHub-Last-Rev: 097364ea86
GitHub-Pull-Request: golang/go#40903
Reviewed-on: https://go-review.googlesource.com/c/go/+/249238
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
commit 72ec930fa7 added basic support for
relocations, but assumed that the symbol value would be 0, likely because
.debug_info always has address == 0 in the ELF section headers.
CL 195679 added further support for relocations, but explicitly encoded
the original assumption that section addresses would be 0.
This change removes that assumption: all relocations will now be
properly computed based on the target symbol value even when that symbol
is a section with a non-zero address.
Typically, sections that are part of a LOAD program segment have
non-zero addresses. For example, .debug_ranges relocations could be
relative to .text, which usually has an address > 0.
Fixes#40879
Change-Id: Ib0a616bb8b05d6c96d179b03ca33a10946fc5d59
GitHub-Last-Rev: 4200de7326
GitHub-Pull-Request: golang/go#41038
Reviewed-on: https://go-review.googlesource.com/c/go/+/250559
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Remove an extra int32-representable check when deciding to use an int32
constant as an immediate value.
Comment out a broken optimization that relies on MaxUint32 being
representable by a signed int32. It never triggers and when fixed, the
signedness of the auxint prevents other optimization passes from
handling it properly, thus causing segfaults in the runtime.
Remove a couple offset representable in 32-bits checks on 32-bit aux
vals.
toolstash-check clean
Change-Id: I148b53403fde523c90d692cb90e412460664b439
Reviewed-on: https://go-review.googlesource.com/c/go/+/230458
Reviewed-by: Keith Randall <khr@golang.org>
We currently use two fields to store the targets of branches.
Some phases use p.To.Val, some use p.Pcond. Rewrite so that
every branch instruction uses p.To.Val.
p.From.Val is also used in rare instances.
Introduce a Pool link for use by arm/arm64, instead of
repurposing Pcond.
This is a cleanup CL in preparation for some stack frame CLs.
Change-Id: If8239177e4b1ea2bccd0608eb39553d23210d405
Reviewed-on: https://go-review.googlesource.com/c/go/+/251437
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Also don't restart DWARF reading from beginning when we are testing
multiple entries.
Also reformat relocationTests slice to use indexed literals.
Change-Id: Ia5f17214483394d0ef033be516df61f0bdc521b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/251637
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
When zero or less, maxIdleTime and maxLifetime means unlimited.
Helper function shortestIdleTimeLocked must not return the
minimum of the two until both are verified to be greater
then zero.
Fixes#40841
Change-Id: I1130332baf4ad259cd90c10f4221f5def8510655
Reviewed-on: https://go-review.googlesource.com/c/go/+/248817
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
The order array was zero initialized by the compiler, but ends up being
overwritten by the runtime anyway.
So let the runtime takes full responsibility for initializing, save us
one instruction per select.
Fixes#40399
Change-Id: Iec1eca27ad7180d4fcb3cc9ef97348206b7fe6b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/251517
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The current command will run this entire set of tests, which takes a
noticeable amount of time. Contributors may wish to run only a subset of
these tests to save time/compute (e.g. when iterating on a CL that
failed tests in that subset). Listing file(s) as operands to the command
will run only those tests.
Change-Id: I1874c43681a594190bc40b61cee0b8d321be73f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/242997
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This was fixed by CL 242084. Retroactively add some tests that would
have failed before the fix.
Also, remove some existing duplicate tests.
Change-Id: I95f7a215d4a9651ded6d739f89c574f33f573c60
Reviewed-on: https://go-review.googlesource.com/c/go/+/251397
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
There was some duplication of logic interpreting the implicit type of
an operand in assignableTo and convertUntyped. Factor out this logic to
a new 'implicitType' function, which returns the implicit type of an
untyped operand when used in a context where a target type is expected.
I believe this resolves some comments about code duplication. There is
other similar code in assignable, assignableTo, and convertUntypes, but
I found it to to be sufficiently semantically distinct to not warrant
factoring out.
Change-Id: I199298a2e58fcf05344318fca0226b460c57867d
Reviewed-on: https://go-review.googlesource.com/c/go/+/242084
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
cmd/go.TestScript/test_main_twice demonstrates a program that invokes
(*M).Run twice in a row. If we only restore os.Exit(0) in m.afterOnce,
we will fail to restore it after the second run and fail the test
process despite both runs passing.
Updates #29062
Updates #23129
Change-Id: Id22ec68f1708e4583c8dda14a8ba0efae7178b85
Reviewed-on: https://go-review.googlesource.com/c/go/+/251262
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We're using sort.SliceStable, so no need to keep track of indexes as well.
Use a more robust test for whether a node is a call.
Add a test that we're actually reordering comparisons. This test fails
without the alg.go changes in this CL because eqstring uses OCALLFUNC
instead of OCALL for its data comparisons.
Update #8606
Change-Id: Ieeec33434c72e3aa328deb11cc415cfda05632e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/237921
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
We currently use two fields to store the targets of branches.
Some phases use p.To.Val, some use p.Pcond. Rewrite so that
every branch instruction uses p.To.Val.
p.From.Val is also used in rare instances.
Introduce a Pool link for use by arm/arm64, instead of
repurposing Pcond.
This is a cleanup CL in preparation for some stack frame CLs.
Change-Id: I9055bf0a1d986aff421e47951a1dedc301c846f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/243318
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
cgo parses GCC’s error messages to classify C identifiers referenced
from Go programs (are they integer constants? type names?). If GCC tries
to colorize its errors, cgo can’t figure out what GCC is saying. GCC
avoids escape sequences in this scenario by default, but the default
behavior can be overridden in at least two places:
- The user can set `CGO_COPTS=-fdiagnostics-color`.
- Whoever compiled GCC can configure GCC itself to always colorize
output.
The most reliable way to ensure that GCC doesn’t colorize output is to
append `-fdiagnostics-color=never` to the GCC command line; do so.
Fixes#40415
Change-Id: Id4bdf8d92fac8b038340b4264f726e8fe38875b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/248398
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This merges an lis + subf into subfic, and for 32b constants
lwa + subf into oris + ori + subf.
The carry bit is no longer used in code generation, therefore
I think we can clobber it as needed. Note, lowered borrow/carry
arithmetic is self-contained and thus is not affected.
A few extra rules are added to ensure early transformations to
SUBFCconst don't trip up earlier rules, fold constant operations,
or otherwise simplify lowering. Likewise, tests are added to
ensure all rules are hit. Generic constant folding catches
trivial cases, however some lowering rules insert arithmetic
which can introduce new opportunities (e.g BitLen or Slicemask).
I couldn't find a specific benchmark to demonstrate noteworthy
improvements, but this is generating subfic in many of the default
bent test binaries, so we are at least saving a little code space.
Change-Id: Iad7c6e5767eaa9dc24dc1c989bd1c8cfe1982012
Reviewed-on: https://go-review.googlesource.com/c/go/+/249461
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
This is a port of CL 244628, updated to move some existing regression
tests into the fixedbugs directory, and to use subtests. Also,
'TestFixed' is renamed to 'TestFixedBugs'.
Change-Id: I43aac3f75f2bd850567d08e8b008d91aeb717064
Reviewed-on: https://go-review.googlesource.com/c/go/+/247904
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Better still would be to avoid passing around module.Version instances
with invalid Version strings in the first place, so that any time we
see a module.Version we know that it is actually a version of a module
(and not a structurally-similar datum with something else tacked on to
one of the fields). But that's a bigger cleanup for which I don't
currently have enough bandwidth.
Fixes#41060
Change-Id: I32fba5619105cbf67dd03691064c82b8ebb3ce18
Reviewed-on: https://go-review.googlesource.com/c/go/+/250951
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
TestBenchmark is broken due to lack of a Config.Importer, but
unfortunately fails silently due to an unchecked error.
Fix the importer and check the error. Also improve the output to include
allocation stats.
Finally, don't run TestBenchmark on go/types by default. If the
benchmark is being used during a refactoring of go/types itself, results
for go/types will not be comparable.
Change-Id: Ib6bdb6807403b3ec99762f535e2496c94bd9b6e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/249517
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
Add s390x support to the addressing modes pass. This significantly
reduces the number of rules we need to have to handle indexed
addressing modes on s390x.
There are some changes introduced with the new approach. Notably
pointer calculations of the form '(ADD x (ADDconst y [c]))' won't
get fully merged into address fields right now, the constant offset
will remain separate. That is a relatively minor issue though.
file before after Δ %
addr2line 4120904 4120960 +56 +0.001%
api 4944005 4948765 +4760 +0.096%
asm 4977431 4984335 +6904 +0.139%
buildid 2683760 2683504 -256 -0.010%
cgo 4557976 4558408 +432 +0.009%
compile 19103577 18916634 -186943 -0.979%
cover 4883694 4885054 +1360 +0.028%
dist 3545177 3553689 +8512 +0.240%
doc 3921766 3921518 -248 -0.006%
fix 3295254 3302182 +6928 +0.210%
link 6539222 6540286 +1064 +0.016%
nm 4105085 4107757 +2672 +0.065%
objdump 4546015 4545439 -576 -0.013%
pack 2416661 2415485 -1176 -0.049%
pprof 13267433 13265489 -1944 -0.015%
test2json 2762180 2761996 -184 -0.007%
trace 10145090 10135626 -9464 -0.093%
vet 6772946 6771738 -1208 -0.018%
total 106588176 106418865 -169311 -0.159%
Fixes#37891.
Change-Id: If60d51f31eb2806b011432a6519951b8668cb42f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250958
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The AssignableTo API is specifically for non-constant values, but is
currently called by gopls for constant completions. Add a test to ensure
that we handle this edge case correctly.
Change-Id: I83115cbca2443a783df1c3090b5741260dffb78e
Reviewed-on: https://go-review.googlesource.com/c/go/+/250258
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
The error returned by convertUntyped is 'cannot convert _ to _', which
can be misleading in contexts where an explicit conversion would be
allowed.
Arguably the error message from convertUntyped should just be 'cannot
use _ as _', as 'convert' has an explicit meaning within the spec.
Making that change caused a large number of test failures, so for now we
just fix this for assignments by interpreting the error.
For #22070
Change-Id: I4eed6f39d1a991e8df7e035ec301d28a05150eb5
Reviewed-on: https://go-review.googlesource.com/c/go/+/242083
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
The intermediate SSA opcodes* are no longer generated during the
lowering pass. The shifting rules have been improved using ISEL.
Therefore, we can remove them and the rules which expand them.
* The removed opcodes are:
LoweredAdd64Carry
ADDconstForCarry
MaskIfNotCarry
FlagCarryClear
FlagCarrySet
Change-Id: I1ebe2726ed988f29ed4800c8f57b428f7a214cd0
Reviewed-on: https://go-review.googlesource.com/c/go/+/249462
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
This change rejects module paths that don't conform to
the new checkModulePathLax function, when loading a go.mod
file. The change uses the checkModulePathLax function instead of
CheckPath because there are still many users who are using
unpublished modules with unpublishable paths, and we don't
want to break them all.
Next, before this change, when go mod init is run in GOPATH,
it would try to use the location of the directory within GOPATH
to infer the module path. After this change, it will only use
that inferred module path if it conforms to module.CheckPath.
Change-Id: Idb36d1655cc76aae82671e87ba634609503ad1a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/211597
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
'go get' will now warn about retracted versions in the build list,
after updating go.mod. The warning instructs users to run
'go get module@latest' to upgrade or downgrade away from the retracted
version.
'go get' now allows users to explicitly request a specific retracted
version.
For #24031
Change-Id: I15fda918dc84258fb35b615dcd33b0f499481bd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/228383
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The -retracted flag causes 'go list' to load information about
retracted module module versions.
When -retracted is used with -f or -json, the Retracted field is set
to a string containing the reason for the retraction on retracted
module versions. The string is based on comments on the retract
directive. This field is also populated when the -u flag is used.
When -retracted is used with -versions, retracted versions are shown.
Normally, they are omitted.
For #24031
Change-Id: Ic13d516eddffb1b8404e21034f78cecc9896d1b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/228382
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The go command now recognizes 'retract' directives in go.mod. A
retract directive may be used by a module author to indicate a
version should not be used. The go command will not automatically
upgrade to a retracted version. Retracted versions will not be
considered when resolving version queries like "latest" that don't
refer to a specific version.
Internally, when the go command resolves a version query, it will find
the highest release version (or pre-release if no release is
available), then it will load retractions from the go.mod file for
that version. Comments on retractions are treated as a rationale and
may appear in error messages. Retractions are only loaded when a query
is resolved, so this should have no impact on performance for most
builds, except when go.mod is incomplete.
For #24031
Change-Id: I17d643b9e03a3445676dbf1a5a351090c6ff6914
Reviewed-on: https://go-review.googlesource.com/c/go/+/228380
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Query and other functions now accept an "allowed" function that
returns an error (previously, the function returned a bool). If the
error is equivalent to ErrDisallowed, it indicates the version is
excluded (or, in a future CL, retracted). This provides predicates a
chance to explain why a version is not allowed.
When a query refers to a specific revision (by version, branch, tag,
or commit name), most callers will not use the Allowed predicate. This
allows commands like 'go list -m' and 'go mod download' to handle
disallowed versions when explicitly requested. 'go get' will reject
excluded versions though.
When a query does not refer to a specific revision (for example,
"latest"), disallowed versions will not be considered.
When an "allowed" predicate returns an error not equivalent to
ErrDisallowed, it may be ignored or returned, depending on the
case. This never happens for excluded versions, but it may happen for
retractions (in a future CL). This indicates a list of retractions
could not be loaded. This frequently happens when offline, and it
shouldn't cause a fatal or warning in most cases.
For #24031
Change-Id: I4df6fb6bd60e3e0259e5b3b4bf71a307b4b32298
Reviewed-on: https://go-review.googlesource.com/c/go/+/228379
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
cmd/internal/objabi/doc.go has comments decribing the (old)
object file format. But cmd/internal/objabi has nothing to do
with object files, and never did. Delete.
Move some comment to cmd/internal/goobj, where the (new) object
file format is actually defined, and update to reflect the
current status.
Change-Id: Ied96089df4be35e5d259a572ed60ee00f2cd0d1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/249958
Reviewed-by: Than McIntosh <thanm@google.com>
This CL applies strong aux typing to the remaining s390x rewrite
rules in preparation for strong aux typing becoming the default.
Passes toolstash-check on s390x.
Change-Id: Id585b0db492780737818024e1b22b4837435b525
Reviewed-on: https://go-review.googlesource.com/c/go/+/250558
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
JavaScript environments are quite unpredictable because bundlers add
mocks for compatibility and libraries can polute the global namespace.
Detect more of such situations:
- Add check that require("fs") returns an object.
- Fix check that require("fs") returns an non-empty object.
- Add check that "module" is defined.
Fixes#40730
Change-Id: I2ce65fc7db64bbbb0b60eec79a4cfe5c3fec99c0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248758
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
CL 220905 added code to identify alternate transports that always error
by using http2erringRoundTripper. This does not work when the transport
is from another package, e.g., http2.erringRoundTripper.
Expose a new method that allow detection of such a RoundTripper.
Switch to an interface that is both a RoundTripper and can return the
underlying error.
Fixes#40213
Change-Id: I170739857ab9e99dffb5fa55c99b24b23c2f9c54
Reviewed-on: https://go-review.googlesource.com/c/go/+/243258
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In order to generate more accurate or informative error messages from
the type checker, it can be helpful to interpret error messages in
context. This is currently achieved in a number of ways:
+ Return a boolean value, and then reverse-engineer the error at the
callsite (as in representable->representableConst).
+ Return a value causing the error (as in Checker.missingMethod), and
add the error at the callsite.
+ Pass a "reason" string pointer to capture the error (as in
Checker.assignableTo), and add the error at the callsite.
+ Pass a "context" string pointer, and use this when writing errors in
the delegated method.
In all cases, it is the responsibility of whatever code calls
Checker.error* to set the operand mode to invalid.
These methods are used as appropriate, depending on whether multiple
errors are generated, whether additional context is needed, and whether
the mere presence of an error needs to be interpreted at the callsite.
However, this practice has some downsides: the plurality of error
handling techniques can be a barrier to readability and composability.
In this CL, we introduce Yet Another Pattern, with the hope that it can
replace some or all of the existing techniques: factor out side-effect
free functions that evaluate a single error, and add helpers for
recording this error in the Checker.
As a proof of concept this is done for Checker.representable and
Checker.convertUntyped. If the general pattern does not seem appropriate
for replacing some or all of the error-handling techniques listed above,
we should revert to an established technique.
Some internal error APIs are refactored to operate on an error, rather
than a types.Error, with internal error metadata extracted using
errors.As. This seemed to have negligible impact on performance, but we
should be careful about actually wrapping errors: I expect that many
users will expect err to be a types.Error.
Change-Id: Ic5c6edcdc02768cd84e04638fad648934bcf3c17
Reviewed-on: https://go-review.googlesource.com/c/go/+/242082
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Fix a data race for clients that mutate requests after receiving a
response error which is caused by the writeLoop goroutine left
running, this can be seen on canceled requests.
Fixes#37669
Change-Id: I0e0e4fd63266326b32587d8596456760bf848b13
Reviewed-on: https://go-review.googlesource.com/c/go/+/232799
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Old behavior is still enabled because it doesn't hurt to leave
it in and existing users of this feature (there are dozens of
us!) will not be surprised. Adding this finer control allows
users to avoid writing ssa.html where they can't, shouldn't, or
just don't want to.
Example, both ways:
$ GOSSAFUNC="(*Reader).Reset" go test -c -o ./a compress/gzip
dumped SSA to bytes/ssa.html
dumped SSA to strings/ssa.html
dumped SSA to bufio/ssa.html
dumped SSA to compress/gzip/ssa.html
$ GOSSAFUNC="compress/gzip.(*Reader).Reset" go test -c -o ./a compress/gzip
dumped SSA to compress/gzip/ssa.html
Updates #40919.
Change-Id: I06b77c3c1d326372a32651570b5dd6e56dfb1d7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/250340
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The StripPrefix wrapper strips a prefix string from the request's
URL.Path field, but doesn't touch the RawPath field. This leads to the
confusing situation when StripPrefix handles a request with URL.RawPath
populated (due to some escaped characters in the request path) and the
wrapped request's RawPath contains the prefix but Path does not.
This change modifies StripPrefix to strip the prefix from both Path and
RawPath. If there are escaped characters in the prefix part of the
request URL the stripped handler serves a 404 instead of invoking the
underlying handler with a mismatched Path/RawPath pair.
This is a backward incompatible change for a very small minority of
requests; I would be surprised if anyone is depending on this behavior,
but it is possible. If that's the case, we could make a more
conservative change where the RawPath is trimmed if possible, but when
the prefix contains escaped characters then we don't 404 but rather send
through the invalid Path/RawPath pair as before.
Fixes#24366
Change-Id: I7030b8c183a3dfce307bc0272bba9a18df4cfe08
Reviewed-on: https://go-review.googlesource.com/c/go/+/233637
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Previously, Readdirnames returned a *PathError on Windows and Plan 9,
but a *SyscallError on POSIX systems.
In contrast, similar methods (such as Stat) return a *PathError on all platforms.
Fixes#38923
Change-Id: I26395905b1e723933f07b792c7aeee7c335949cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/233917
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Right now we just prevent such types from being on the heap. This CL
makes it so they cannot appear on the stack either. The distinction
between heap and stack is pretty vague at the language level (e.g. it
is affected by -N), and we don't need the flexibility anyway.
Once go:notinheap types cannot be in either place, we don't need to
consider pointers to such types to be pointers, at least according to
the garbage collector and stack copying. (This is the big win of this
CL, in my opinion.)
The distinction between HasPointers and HasHeapPointer no longer
exists. There is only HasPointers.
This CL is cleanup before possible use of go:notinheap to fix#40954.
Update #13386
Change-Id: Ibd895aadf001c0385078a6d4809c3f374991231a
Reviewed-on: https://go-review.googlesource.com/c/go/+/249917
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
par.Work performs two different tasks: deduplicating work (a task
which overlaps with par.Cache), and executing limited active work in
parallel. It also requires the caller to re-invoke Do whenever the
workqueue transititions from empty to non-empty.
The new par.Queue only performs the second of those two tasks, and
presents a simpler API: it starts and stops its own goroutines as
needed (indicating its idle state via a channel), rather than
expecting the caller to drive the transitions explicitly.
For #36460
Change-Id: I5c38657dda63ab55718497467d05d41744ff59f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/247766
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously they were cached per mvsReqs instance. However, the
contents of the go.mod file of a given dependency version can only
vary if the 'replace' directives that apply to that version have
changed, and the only time we change 'replace' directives is in 'go
mod edit' (which does not care about the build list or MVS).
This not only simplifies the mvsReqs implementation, but also makes
more of the underlying logic independent of mvsReqs.
For #36460
Change-Id: Ieac20c2fcd56f64d847ac8a1b40f9361ece78663
Reviewed-on: https://go-review.googlesource.com/c/go/+/244774
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously, this cache was a member of the (ephemeral) modload.loader
struct. However, the Go language version for a given module version
does not vary based on the build list, the set of loaded packages, the
build tags in use, the meaning of the "all" pattern, or anything else
that can be configured for an instance of the package loader. The map
containing that information is therefore not appropriate as a field of
the (configurable, package-list-dependent) loader struct.
The Go language version mapping could, in theory, be read from the
go.mod file in the module cache (or replacement directory) every time
it is needed: this map is just a cache, and as such it belongs
alongside the other caches and indexes in the modload package, which
are currently found in modfile.go.
We may want to do the same sort of global caching for the mapping from
each module.Version to its list of direct requirements (which are
similarly idempotent), but for now that is left for a future change.
For #36460
For #36876
Change-Id: I90ac176ffea97f30c47d6540c3dfb874dc9cfa4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/244078
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Previously, we suppressed the module version annotation if the last
error in the stack was a *module.ModuleError, regardless of its path.
However, if the error is for a replacement module, that produces a
confusing error message: the error is attributed to the last module in
the error path, but actually originates in the replacement (which is
not otherwise indicated).
Now, we print both the original and the replacement modules when they
differ, which may add some unfortunate redundancy in the output but at
least doesn't drop the very relevant information about replacements.
Fixes#35039
Change-Id: I631a7398033602b1bd5656150a4fad4945a87ade
Reviewed-on: https://go-review.googlesource.com/c/go/+/247765
Reviewed-by: Jay Conrod <jayconrod@google.com>
When we print the stack from a BuildListError, we print the main
module first and the error last. That was the opposite of the order in
which in was stored in memory, leading to (arguably) more complex code
and (definitely) my own inability to reason about the contents of the
slice.
For now, it's still more convenient to construct the stack reversed,
so we do that and then reverse it before packing it into the error.
For #36460
Change-Id: I6312fb67b2ad9bf9b64071fe829854833208bad7
Reviewed-on: https://go-review.googlesource.com/c/go/+/244759
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously, when we encountered an excluded version in any module's
requirements, we would resolve it to the next higher version.
Unfortunately, the meaning of “the next higher version” can change
over time.
Moreover, users who use 'exclude' directives normally either already
require some higher version (using the 'exclude' directive to prune
out invalid requirements from some intermediate version), or already
require some lower version (using the 'exclude' directive to prevent
'go get -u' from upgrading to a known-bad version). In both of these
cases, resolving an upgrade for the excluded version is needless work
even in the best case: it adds work for the 'go' command when there is
already a perfectly usable selected version of the module in the
requirement graph.
Instead, we now interpret the 'exclude' directive as dropping all
references to the excluded version.
This implements the approach described in
https://golang.org/issue/36465#issuecomment-572694990.
Fixes#36465
Updates #36460
Change-Id: Ibf0187daced417b4cc23b97125826778658e4b0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/244773
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This allows semver-based comparisons of the version without additional allocations.
Also comment on the reason for the loops that iterate over modFile instead.
(I was reading the vendor code in order to add the lazy-loading version check,
and this section was a bit unclear to me.)
For #36460
Change-Id: I11559d81ffb4eba0e4e10e6fa3c01990b11f9180
Reviewed-on: https://go-review.googlesource.com/c/go/+/240622
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Due to a typo, this test case was not actually exercising the bug
described in golang/go#33656. Update it to do so. Interestingly, the
comparison is now valid (as it should be) -- I suspect #33656 is
actually fixed.
Fixes#33656
Change-Id: If50a917f6477d8eb4f82f5a2a96bf5d9123ff0d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/241263
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
These exported functions are mostly trivial wrappers, but do make
certain assumptions about how the underlying Checker APIs can be called.
Add some simple tests.
Change-Id: I68e9ae875353c12d118ec961a6f3834385fbbb97
Reviewed-on: https://go-review.googlesource.com/c/go/+/241262
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
With this patch, opt pass can expose more obvious constant-folding
opportunites.
Example:
func test(i int) int {return (i+8)-(i+4)}
The previous version:
MOVD "".i(FP), R0
ADD $8, R0, R1
ADD $4, R0, R0
SUB R0, R1, R0
MOVD R0, "".~r1+8(FP)
RET (R30)
The optimized version:
MOVD $4, R0
MOVD R0, "".~r1+8(FP)
RET (R30)
This patch removes some existing reassociation rules, such as "x+(z-C)",
because the current generic rewrite rules will canonicalize "x-const"
to "x+(-const)", making "x+(z-C)" equal to "x+(z+(-C))".
This patch also adds test cases.
Change-Id: I857108ba0b5fcc18a879eeab38e2551bc4277797
Reviewed-on: https://go-review.googlesource.com/c/go/+/237137
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This patch adds the ARM6464Bitfield auxInt to auxIntType() and
returns its Go type as "arm64Bitfield" type, which is defined
as int16 type.
And the Go type of SymOff auxInt is int32, but some functions
(such as min(), areAdjacentOffsets() and read16/32/64(),etc.)
use SymOff as an input parameter and treat its type as int64,
this patch adds the type conversion for these rules.
Passes toolstash-check -all.
Change-Id: Ib234b48d0a97ef244dd37878e06b5825316dd782
Reviewed-on: https://go-review.googlesource.com/c/go/+/234378
Reviewed-by: Keith Randall <khr@golang.org>
Add a new conversion function to convert aux type to Op type.
Passes toolstash-check -all.
Change-Id: I25d649a5296f6f178d64320dfc5d291e0a597e24
Reviewed-on: https://go-review.googlesource.com/c/go/+/233739
Reviewed-by: Keith Randall <khr@golang.org>
Add a check code for checking whether the "c" value can be
represented as a signed 32 bit integer in some rules.
Passes toolstash-check -all.
Change-Id: I84e4431dc75945985695516d34565b841c8b53e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/233738
Reviewed-by: Keith Randall <khr@golang.org>
CL 249962 added wasm StorepNoWB implementation in assembly, it's now
like all other architectures. This CL adds a general test that the
second param of StorepNoWB must be force to escape.
Fixes#40975
Change-Id: I1eccc7e50a3ec742a1912d65f25b15f9f5ad9241
Reviewed-on: https://go-review.googlesource.com/c/go/+/249761
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Turns out if your failure is in a function with a name like "Reset()"
there will be a lot of hits on the same hashcode. Adding package sensitivity
solves this problem.
In additionm, it turned out that in the case that a logfile was specified
for the GOSSAHASH logging, that it was opened in create mode, which meant
that multiple compiler invocations would reset the file to zero length.
Opening in append mode works better; the automated harness
(github.com/dr2chase/gossahash) takes care of truncating the file before use.
Change-Id: I5601bc280faa94cbd507d302448831849db6c842
Reviewed-on: https://go-review.googlesource.com/c/go/+/246937
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The second argument of StorepNoWB must be forced to escape.
The current Go code does not explicitly enforce that property.
By implementing in assembly, and not using go:noescape, we
force the issue.
Test is in CL 249761. Issue #40975.
This CL is needed for CL 249917, which changes how go:notinheap
works and breaks the previous StorepNoWB wasm code.
I checked for other possible errors like this. This is the only
go:notinheap that isn't in the runtime itself.
Change-Id: I43400a806662655727c4a3baa8902b63bdc9fa57
Reviewed-on: https://go-review.googlesource.com/c/go/+/249962
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Current peFile.goarch looks for symbols like "_rt0_386_windows" to
determine GOARCH. But "_rt0_386_windows" is not present in executables
built with cgo.
Use pe.FileHeader.Machine instead. This should work with any Windows
executable, not just with Go built executable.
Fixes#39682
Change-Id: Ie0ffce664f4b8b8fed69b2ecc482425b042a38d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/240957
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
In
type T1 struct { t2 }
type t2 int
func (t2) M()
T1 has method M because it embeds t2, which has M. Classify
the example
func ExampleT1_M
with T1 instead of ignoring it, as is done currently. There is no
other way to provide an example for such a method, since its original
type is unexported.
Continue to ignore examples on methods from embedded types that are
exported, unless in AllMethods mode. Examples for those methods could
be written on the original type.
The change involves removing a check in classifyExamples. The check
isn't necessary to get the above behavior because
reader.collectEmbeddedMethods and sortedFuncs already generate the
appropriate list of methods.
For #40172.
Change-Id: Ibe7d965ecba6426466184e6e6655fc05989e9caf
Reviewed-on: https://go-review.googlesource.com/c/go/+/249557
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
checkptr has code to recognize &^ expressions, but it didn't take into
account that "p &^ x" gets rewritten to "p & ^x" during walk, which
resulted in false positive diagnostics.
This CL changes walkexpr to mark OANDNOT expressions with Implicit
when they're rewritten to OAND, so that walkCheckPtrArithmetic can
still recognize them later.
It would be slightly more idiomatic to instead mark the OBITNOT
expression as Implicit (as it's a compiler-generated Node), but the
OBITNOT expression might get constant folded. It's not worth the extra
complexity/subtlety of relying on n.Right.Orig, so we set Implicit on
the OAND node instead.
To atone for this transgression, I add documentation for nodeImplicit.
Fixes#40917.
Change-Id: I386304171ad299c530e151e5924f179e9a5fd5b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/249477
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
The optimization that replaces inline markers with pre-existing
instructions assumes that 'Prog' values produced by the compiler are
still reachable after the assembler has run. This was not true on
s390x where the assembler was removing NOP instructions from the
linked list of 'Prog' values. This led to broken inlining data
which in turn caused an infinite loop in the runtime traceback code.
Fix this by stopping the s390x assembler backend removing NOP
values. It does not make any difference to the output of the
assembler because NOP instructions are 0 bytes long anyway.
Fixes#40473.
Change-Id: I9b97c494afaae2d5ed6bca4cd428b4132b5f8133
Reviewed-on: https://go-review.googlesource.com/c/go/+/249448
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This change does context propagation (and only context propagation)
necessary to add context to modfetch.Download and pkg.LoadImport.
This was done by adding context to their callers, and then
adding context to all call-sites, and then repeating adding
context to callers of those enclosing functions and their
callers until none were left. In some cases the call graph expansion
was pruned by using context.TODOs.
The next CL will add a span to Download. I kept it out of this
change to avoid making it any larger (and harder to review)
than it needs to be.
Updates #38714
Change-Id: I7a03416e04a14ca71636d96f2c1bda2c4c30d348
Reviewed-on: https://go-review.googlesource.com/c/go/+/249021
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Opening the html writer can fail, and the failure printer wants
to use the entry block's line number. So make sure we set up
the entry block first.
Fixes#40919
Change-Id: I4ffa2839b45a721bbaf04ff84418e8108fa1cc37
Reviewed-on: https://go-review.googlesource.com/c/go/+/249497
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
par.Work is used in a number of places as a parallel
work queue. This change replaces it with goroutines
and channels in a number of simpler places where it's
used.
This is the same CL as golang.org/cl/240062 and golang.org/cl/248326
except for the following changes in convert.go (all line numbers
from this CL), as well as fixing up imports in download.go:
- On line 44, the "*" before modules.Versions is removed (we were
trying to assign to a nil value on lines 72 and 73).
- Line 64 is new, and ensures that we receive on the semaphore
channel once the goroutine function exits. (The previous versions
of this CL only received at the end of the function, ignoring
the return point in the branch in the middle of the function.)
- The semaphore channel receive right before line 74 is gone,
replaced with the deferred receive above.
- The if block at line 83 is new, accounting for cases where
modfetch.ImportRepoRev returned an error in the goroutine,
so that versions[i] is ignored.
Change-Id: I0e33670bb2eb0a1e4d7a5fa693a471e61ffbc8b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/249020
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Previously, on Unix systems, when the profiler was enabled or disabled,
we called setitimer once per thread. With this change we instead call
it once per process.
Change-Id: I90f0189b562e11232816390dc7d55ed154bd836d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240003
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
People sometimes expect Join to trim .. components from its arguments
before joining, and are surprised that it doesn't. This is bad if they
were relying on that assumed behaviour to prevent directory traversal
attacks.
While a careful reading of the documentation for Join and Clean
might dispel this notion, it is not obvious at first glance.
Add a case to the examples to nudge people in the right direction.
Updates #40373
Change-Id: Ib5792c12ba1000811a0c0eb77048196d0b26da60
Reviewed-on: https://go-review.googlesource.com/c/go/+/249177
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Add a new lowering rule to match and replace such instances
with the MADDLD instruction available on power9 where
possible.
Likewise, this plumbs in a new ppc64 ssa opcode to house
the newly generated MADDLD instructions.
When testing ed25519, this reduced binary size by 936B.
Similarly, MADDLD combination occcurs in a few other less
obvious cases such as division by constant.
Testing of golang.org/x/crypto/ed25519 shows non-trivial
speedup during keygeneration:
name old time/op new time/op delta
KeyGeneration 65.2µs ± 0% 63.1µs ± 0% -3.19%
Signing 64.3µs ± 0% 64.4µs ± 0% +0.16%
Verification 147µs ± 0% 147µs ± 0% +0.11%
Similarly, this test binary has shrunk by 66488B.
Change-Id: I077aeda7943119b41f07e4e62e44a648f16e4ad0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248723
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Remove some unnecessary code. Most significantly, we can skip testing
"if ch == nil { block() }", because this is already the semantics
implied by normal send/receive operations.
Updates #40410.
Change-Id: I4acd33383cc876719fc3b998d85244d4ac1ff9d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/245126
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Currently, we include a "kind" field on scase to distinguish the three
kinds of cases in a select statement: sends, receives, and defaults.
This commit removes by kind field by instead arranging for the
compiler to always place sends before receives, and to provide their
counts separately. It also passes an explicit "block bool" parameter
to avoid needing to include a default case in the array.
It's safe to shuffle cases like this because the runtime will
randomize the order they're polled in anyway.
Fixes#40410.
Change-Id: Iaeaed4cf7bddd576d78f2c863bd91a03a5c82df2
Reviewed-on: https://go-review.googlesource.com/c/go/+/245125
Reviewed-by: Keith Randall <khr@golang.org>
Per-case PCs are only needed for race detector builds, so this allows
skipping allocating stack space for them for non-race builds.
It's possible to arrange the PCs and order arrays consecutively in
memory so that we could just reuse the order0 pointer to identify
both. However, there's more risk of that silently going wrong, so this
commit passes them as separate arguments for now. We can revisit this
in the future.
Updates #40410.
Change-Id: I8468bc25749e559891cb0cb007d1cc4a40fdd0f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/245124
Reviewed-by: Keith Randall <khr@golang.org>
Currently, selectgo does an initial pass over the cases array to look
for entries with nil channels, so they can be easily recognized and
skipped later on. But this still involves actually visiting the cases.
This commit changes selectgo to omit cases with nil channels when
constructing pollorder, so that they'll be skipped over entirely later
on. It also checks for caseDefault up front, which will facilitate
changing it to use a "block bool" parameter instead.
Updates #40410.
Change-Id: Icaebcb8f08df03cc33b6d8087616fb5585f7fedd
Reviewed-on: https://go-review.googlesource.com/c/go/+/245123
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
selectgo will report at most one block event, so there's no need to
keep a releasetime for every select case. It suffices to simply track
the releasetime of the case responsible for the wakeup.
Updates #40410.
Change-Id: I72679cd43dde80d7e6dbab21a78952a4372d1e79
Reviewed-on: https://go-review.googlesource.com/c/go/+/245122
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The current wakeup protocol for channel communications is that the
second goroutine sets gp.param to the sudog when a value is
successfully communicated over the channel, and to nil when the wakeup
is due to closing the channel.
Setting nil to indicate channel closure works okay for chansend and
chanrecv, because they're only communicating with one channel, so they
know it must be the channel that was closed. However, it means
selectgo has to re-poll all of the channels to figure out which one
was closed.
This commit adds a "success" field to sudog, and changes the wakeup
protocol to always set gp.param to sg, and to use sg.success to
indicate successful communication vs channel closure.
While here, this also reorganizes the chansend code slightly so that
the sudog is still released to the pool if the send blocks and then is
awoken because the channel closed.
Updates #40410.
Change-Id: I6cd9a20ebf9febe370a15af1b8afe24c5539efc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/245019
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Replace strings.Split by strings.IndexByte and explicit
slicing to avoid the allocation of the return slice
of strings.Split.
name old time/op new time/op delta
Marshal 43.3µs ± 1% 36.7µs ± 1% -15.23% (p=0.000 n=9+9)
name old alloc/op new alloc/op delta
Marshal 10.7kB ± 0% 9.2kB ± 0% -13.96% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Marshal 444 ± 0% 366 ± 0% -17.57% (p=0.000 n=10+10)
Change-Id: I9e727defa23f7e5fc684f246de0136fe28cf8d25
Reviewed-on: https://go-review.googlesource.com/c/go/+/231738
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
We could instead fix cmd/test2json to treat PAUSE lines as *not*
changing the active test name, but that seems like it would be more
confusing to humans, and also wouldn't fix tools that parse output
using existing builds of cmd/test2json.
Fixes#40657
Change-Id: I937611778f5b1e7dd1d6e9f44424d7e725a589ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/248727
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
There were two places where the -short flag was added in order to
speed up tests when run in short mode, in CL 178399 and CL 177417.
It appears viable to re-use the GO_TEST_SHORT value so that -short
flag is not used when the tests are executed on a longtest builder,
where it is not a goal to skip slow tests for improved performance.
Do so, in order to make the testing configurations simpler and more
predictable.
Factor out the flag name out of the string returned by short, so that
it can be used in context of 'go test' which can accept a -short flag,
and a test binary which requires the use of a longer -test.short flag.
For #39054.
For #29252.
Change-Id: I52dfbef73cc8307735c52e2ebaa609305fb05933
Reviewed-on: https://go-review.googlesource.com/c/go/+/233898
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When external linking, for large binaries, the external linker
may insert a trampoline for the write barrier call, which looks
0000000005a98cc8 <__long_branch_runtime.gcWriteBarrier>:
5a98cc8: 86 01 82 3d addis r12,r2,390
5a98ccc: d8 bd 8c e9 ld r12,-16936(r12)
5a98cd0: a6 03 89 7d mtctr r12
5a98cd4: 20 04 80 4e bctr
It clobbers R12 (and CTR, which is never live across a call).
As at compile time we don't know whether the binary is big and
what link mode will be used, I think we need to mark R12 as
clobbered for write barrier call. For extra safety (future-proof)
we mark caller-saved register that cannot be used for function
arguments, which includes R11, as potentially clobbered as well.
Fixes#40851.
Change-Id: Iedd901c5072f1127cc59b0a48cfeb4aaec81b519
Reviewed-on: https://go-review.googlesource.com/c/go/+/248917
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This reverts the following changes:
• cmd/go: add tracing for querying and downloading from the proxy
CL 242786, commit 1a35583418
• cmd/go: do context propagation for tracing downloads
CL 248327, commit c0cf190d22
• cmd/go/internal: remove some users of par.Work
CL 248326, commit f30044a03b
Reason for revert: broke linux 386 and amd64 longtest builders.
The problem started with CL 248326, but CL 248327 and CL 242786
are reverted as well due to conflicts.
Updates #38714.
Fixes#40861.
Change-Id: I68496b4e5a27e47a42183553c3a645b288edac83
Reviewed-on: https://go-review.googlesource.com/c/go/+/249017
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Some of the existing optimizations aren't triggered because they
are handled by the generic rules so this CL removes them. Also
some constraints were copied without much thought from the amd64
rules and they don't make sense on s390x, so we remove those
constraints.
Finally, add a 'multiply by the sum of two powers of two'
optimization. This makes sense on s390x as shifts are low latency
and can also sometimes be optimized further (especially if we add
support for RISBG instructions).
name old time/op new time/op delta
IntMulByConst/3-8 1.70ns ±11% 1.10ns ± 5% -35.26% (p=0.000 n=10+10)
IntMulByConst/5-8 1.64ns ± 7% 1.10ns ± 4% -32.94% (p=0.000 n=10+9)
IntMulByConst/12-8 1.65ns ± 6% 1.20ns ± 4% -27.16% (p=0.000 n=10+9)
IntMulByConst/120-8 1.66ns ± 4% 1.22ns ±13% -26.43% (p=0.000 n=10+10)
IntMulByConst/-120-8 1.65ns ± 7% 1.19ns ± 4% -28.06% (p=0.000 n=9+10)
IntMulByConst/65537-8 0.86ns ± 9% 1.12ns ±12% +30.41% (p=0.000 n=10+10)
IntMulByConst/65538-8 1.65ns ± 5% 1.23ns ± 5% -25.11% (p=0.000 n=10+10)
Change-Id: Ib196e6bff1e97febfd266134d0a2b2a62897989f
Reviewed-on: https://go-review.googlesource.com/c/go/+/248937
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Clean up some pclntab state, specifically:
1) Remove the oldPclnState type.
2) Move a structure out of pclnState, that was holding some memory.
3) Stop passing container around everywhere and calling emitPcln. Use a
slice of function symbols instead.
Change-Id: I74e916564cd769a706750d024e55ee0d811a79da
Reviewed-on: https://go-review.googlesource.com/c/go/+/248379
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Move the pctables out of pclntab_old. Creates a new generator symbol,
runtime.pctab, which holds all the deduplicated pctables. Also, tightens
up some of the types in runtime.
Darwin, cmd/compile statistics:
alloc/op
Pclntab_GC 26.4MB ± 0% 13.8MB ± 0%
allocs/op
Pclntab_GC 89.9k ± 0% 86.4k ± 0%
liveB
Pclntab_GC 25.5M ± 0% 24.2M ± 0%
No significant change in binary size.
Change-Id: I1560fd4421f8a210f8d4b508fbc54e1780e338f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/248332
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
For an unsigned integer, it's useful to convert its order test with 0/1
to its equality test with 0. We can save a comparison instruction that
followed by a conditional branch on arm64 since it supports
compare-with-zero-and-branch instructions. For example,
if x > 0 { ... } else { ... }
the original version:
CMP $0, R0
BLS 9
the optimized version:
CBZ R0, 8
Updates #21439
Change-Id: Id1de6f865f6aa72c5d45b29f7894818857288425
Reviewed-on: https://go-review.googlesource.com/c/go/+/246857
Reviewed-by: Keith Randall <khr@golang.org>
Corrects ErrReader's signature to what was accepted in the approved
proposal, and also removes an exported ErrIO which wasn't part of
the proposal and is unnecessary.
The new signature allows users to customize their own errors.
While here, started examples, with ErrReader leading the way.
Updates #38781
Change-Id: Ia7f84721f11061343cfef8b1adc2b7b69bc3f43c
Reviewed-on: https://go-review.googlesource.com/c/go/+/248898
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
If the AND has other uses, we end up saving an argument to the AND
in another register, so we can use it for the TEST. No point in doing that.
Change-Id: I73444a6aeddd6f55e2328ce04d77c3e6cf4a83e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/241280
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
I noticed that there is a Todo comment here. This variable is only used for filename when dump a function's ssa passes result in details. It is no problem to print a function alone, but may be edited by not only one goroutine if dump multiple functions at the same time. Although it looks only dump one function's ssa passes now. As far as I am concerned this variable can be a member variable of the struct Func. I'm not sure if this change is necessary. Looking forward to your advices, thank you very much.
Change-Id: I35dd7247889e0cc7f19c0b400b597206592dee75
Reviewed-on: https://go-review.googlesource.com/c/go/+/244918
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
There are some architecture-independent rules in #21439, since an
unsigned integer >= 0 is always true and < 0 is always false. This CL
adds these optimizations to generic rules.
Updates #21439
Change-Id: Iec7e3040b761ecb1e60908f764815fdd9bc62495
Reviewed-on: https://go-review.googlesource.com/c/go/+/246617
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change does context propagation (and only context propagation)
necessary to add context to modfetch.Download and pkg.LoadImport.
This was done by adding context to their callers, and then
adding context to all call-sites, and then repeating adding
context to callers of those enclosing functions and their
callers until none were left. In some cases the call graph expansion
was pruned by using context.TODOs.
The next CL will add a span to Download. I kept it out of this
change to avoid making it any larger (and harder to review)
than it needs to be.
Updates #38714
Change-Id: I5bf2d599aafef67334c384dfccd5e255198c85b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/248327
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
If we are parsing a test output, and the test does not end in the
usual PASS or FAIL line (say, because it panicked), then we need the
exit status of the test binary in order to determine whether the test
passed or failed. If we don't have that status available, we shouldn't
guess arbitrarily — instead, we should omit the final "pass" or "fail"
action entirely.
(In practice, we nearly always DO have the final status, such as when
running 'go test' or 'go tool test2json some.exe'.)
Fixes#40132
Change-Id: Iae482577361a6033395fe4a05d746b980e18c3de
Reviewed-on: https://go-review.googlesource.com/c/go/+/248624
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
par.Work is used in a number of places as a parallel
work queue. This change replaces it with goroutines
and channels in a number of simpler places where it's
used.
Change-Id: I0620eda46ec7b2c0599a8b9361639af7bb73a05a
Reviewed-on: https://go-review.googlesource.com/c/go/+/248326
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This change adds context, and a span to modload.LoadBuildList and
propagates context into modload.BuildList. It's the start
of a run of CLs to add trace spans for module operations.
Updates #38714
Change-Id: I0d58dd394051526338092dc9a5ec29a9e087e4e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/248325
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
These commands are build-like commands that do their own flag
processing, so the value of debug-trace isn't available until
the command starts running. Start tracing in the cmd's run
function.
Updates #38714
Change-Id: I4d633e6ee907bf09feac52c2aff3daceb9b20e12
Reviewed-on: https://go-review.googlesource.com/c/go/+/248324
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This could help make it easier to identify blocking
dependencies when examining traces. Flows can be turned
off when viewing traces to remove potential distractions.
Updates #38714
Change-Id: Ibfd3f1a1861e3cac31addb053a2fca7ee796c4d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/248322
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Action.Func is now a func(*Builder, context.Context, *Action), so that
contexts can be propagated into the action funcs. While context
is traditionally the first parameter of a function, it's the second
parameter of Action.Func's type to continue to allow for methods
on Builder to be used as functions taking a *Builder as the first
parameter. context.Context is instead the first parameter on
those functions.
Change-Id: I5f058d6a99a1e96fe2025f2e8ce30a033d12e935
Reviewed-on: https://go-review.googlesource.com/c/go/+/248321
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This change adds a trace event for each action and also
annotates each of the action execution goroutines with trace.Goroutine
so that the actions eaxecuted by each goroutine appear on different threads in
the chrome trace viewer.
Updates #38714
Change-Id: I2e58dc5606b2e3f7f87076a61e1cc6a2014255c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/248320
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
trace.StartGoroutine will associate the trace information on the context
with a new chrome profiler thread id. The chrome profiler doesn't
expect multiple trace events to have the same thread id, so this
will allow us to display concurrent events on the trace.
Updates #38714
Change-Id: I888b0cce15a5a01db66366716fdd85bf86c832cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/248319
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
On ARM, for a JMP/CALL relocation, the instruction bytes is
encoded in Reloc.Add (issue #19811). I really hate it, but before
it is fixed we have to follow the rule and emit the right bits
from r.Add.
Fixes#40769.
Change-Id: I862e105408d344c5cc58ca9140d2e552e4364453
Reviewed-on: https://go-review.googlesource.com/c/go/+/248399
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Than McIntosh <thanm@google.com>
cgo_import_dynamic pragma indicates a symbol is imported from a
dynamic library. Currently, the linker does not actually link
against the dynamic library, so we have to "force" it by using
//go:cgo_import_dynamic _ _ "dylib"
syntax, which links in the library unconditionally.
This CL changes it to link in the library automatically when a
symbol is imported from the library, without using the "force"
syntax. (The "force" syntax is still supported.)
Remove the unconditional imports in the runtime. Now,
Security.framework and CoreFoundation.framework are only linked
when the x509 package is imported (or otherwise specified).
Fixes#40727.
Change-Id: Ied36b1f621cdcc5dc4a8f497cdf1c554a182d0e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248333
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently, the GC stores the object marks for checkmarks mode in the
heap bitmap using a rather complex encoding: for one word objects, the
checkmark is stored in the pointer/scalar bit since one word objects
must be pointers; for larger objects, the checkmark is stored in what
would be the scan/dead bit for the second word of the object. This
encoding made more sense when the runtime used the first scan/dead bit
as the regular mark bit, but we moved away from that long ago.
This encoding and overloading of the heap bitmap bits causes a great
deal of complexity in many parts of the allocator and garbage
collector and leads to some subtle bugs like #15903.
This CL moves the checkmarks mark bits into their own per-arena bitmap
and reclaims the second scan/dead bit as a regular scan/dead bit.
I tested this by enabling doubleCheck mode in heapBitsSetType and
running in both regular and GODEBUG=gccheckmark=1 mode.
Fixes#15903.
No performance degradation. (Very slight improvement on a few
benchmarks, but it's probably just noise.)
name old time/op new time/op delta
BiogoIgor 16.6s ± 1% 16.4s ± 1% -0.94% (p=0.000 n=25+24)
BiogoKrishna 19.2s ± 3% 19.2s ± 3% ~ (p=0.638 n=23+25)
BleveIndexBatch100 6.12s ± 5% 6.17s ± 4% ~ (p=0.170 n=25+25)
CompileTemplate 206ms ± 1% 205ms ± 1% -0.43% (p=0.005 n=24+24)
CompileUnicode 82.2ms ± 2% 81.5ms ± 2% -0.95% (p=0.001 n=22+22)
CompileGoTypes 755ms ± 3% 754ms ± 4% ~ (p=0.715 n=25+25)
CompileCompiler 3.73s ± 1% 3.73s ± 1% ~ (p=0.445 n=25+24)
CompileSSA 8.67s ± 1% 8.66s ± 1% ~ (p=0.836 n=24+22)
CompileFlate 134ms ± 2% 133ms ± 1% -0.66% (p=0.001 n=24+23)
CompileGoParser 164ms ± 1% 163ms ± 1% -0.85% (p=0.000 n=24+24)
CompileReflect 466ms ± 5% 466ms ± 3% ~ (p=0.863 n=25+25)
CompileTar 182ms ± 1% 182ms ± 1% -0.31% (p=0.048 n=24+24)
CompileXML 249ms ± 1% 248ms ± 1% -0.32% (p=0.031 n=21+25)
CompileStdCmd 10.3s ± 1% 10.3s ± 1% ~ (p=0.459 n=23+23)
FoglemanFauxGLRenderRotateBoat 8.66s ± 1% 8.62s ± 1% -0.47% (p=0.000 n=23+24)
FoglemanPathTraceRenderGopherIter1 20.3s ± 3% 20.2s ± 2% ~ (p=0.893 n=25+25)
GopherLuaKNucleotide 29.7s ± 1% 29.8s ± 2% ~ (p=0.421 n=24+25)
MarkdownRenderXHTML 246ms ± 1% 247ms ± 1% ~ (p=0.558 n=25+24)
Tile38WithinCircle100kmRequest 779µs ± 4% 779µs ± 3% ~ (p=0.954 n=25+25)
Tile38IntersectsCircle100kmRequest 1.02ms ± 3% 1.01ms ± 4% ~ (p=0.658 n=25+25)
Tile38KNearestLimit100Request 984µs ± 4% 986µs ± 4% ~ (p=0.627 n=24+25)
[Geo mean] 552ms 551ms -0.19%
https://perf.golang.org/search?q=upload:20200723.6
Change-Id: Ic703f26a83fb034941dc6f4788fc997d56890dec
Reviewed-on: https://go-review.googlesource.com/c/go/+/244539
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
The heapBitsSetType function has a slow doubleCheck debugging mode
that checks the bitmap written out by the rest of the function using
far more obvious logic. But even this has some surprisingly complex
logic in it. Simplify it a bit. This also happens to fix the logic on
32-bit.
Fixes#40335.
Change-Id: I5cee482ad8adbd01cf5b98e35a270fe941ba4940
Reviewed-on: https://go-review.googlesource.com/c/go/+/244538
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The runtime has its own implementation of string indexing. To reduce
code duplication and cognitive load, replace this with calls to the
internal/bytealg package. We can't do this on Plan 9 because it needs
string indexing in a note handler (which isn't allowed to use the
optimized bytealg version because it uses SSE), so we can't just
eliminate the index function, but this CL does down-scope it so make
it clear it's only for note handlers on Plan 9.
Change-Id: Ie1a142678262048515c481e8c26313b80c5875df
Reviewed-on: https://go-review.googlesource.com/c/go/+/244537
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Since NetBSD 7, hw.ncpuonline reports the number of CPUs online, while
hw.cpu reports the number of CPUs configured. Try hw.cpuonline first and
fall back to hw.ncpu in case it fails (which is the case on NetBSD
before 7.0).
This follows the behavior on OpenBSD (see CL 161757). Also, Go
in pkgsrc is patched to use hw.cpuonline, so this CL would allow said
patch to be dropped.
Updates #30824
Change-Id: Id1c19dff2c1e4401e6074179fae7c708ba0e3098
Reviewed-on: https://go-review.googlesource.com/c/go/+/231957
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
Instead of returning a bad verb error format for runes above
utf8.Maxrune return a quoted utf8.RuneError rune (\ufffd).
This makes the behaviour consistent with the "c" verb and
aligns behaviour to not return bad verb error format when
a verb is applied to the correct argument type.
Fixes#14569
Change-Id: I679485f6bb90ebe408423ab68af16cce38816cd0
Reviewed-on: https://go-review.googlesource.com/c/go/+/248759
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The two existing benchmarks encode randomized pixels, which isn't very
representative. The two new benchmarks encode a PNG photo as a GIF.
Also rename the benchmarks for consistency.
Also fix the bytes-per-op measure for paletted images, which are 1 (not
4) bytes per pixel.
Also simplify BenchmarkEncodeRandomPaletted (formerly just called
BenchmarkEncode). It doesn't need to generate a random palette (and the
GIF encoder largely doesn't care about the palette's RGBA values).
Use palette.Plan9 instead, a pre-existing 256-element color palette.
Change-Id: I10a6ea4e9590bb0d9f76e8cc0f4a88d43b1d650d
Reviewed-on: https://go-review.googlesource.com/c/go/+/248218
Reviewed-by: David Symonds <dsymonds@golang.org>
There is an optimization rule that removes calls to racefuncenter and
racefuncexit, if there are no other race calls in the function. The
rule removes the call to racefuncenter, but it does *not* remove the
store of its argument to the outargs section of the frame. If the
outargs section is now size 0 (because the calls to racefuncenter/exit
were the only calls), then that argument store clobbers the frame
pointer instead.
The fix is to remove the argument store when removing the call to
racefuncenter. (Racefuncexit doesn't have an argument.)
Change-Id: I183ec4d92bbb4920200e1be27b7b8f66b89a2a0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/248262
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
These operations are async unsafe on architectures that use
frame pointers.
The reason is they rely on data being safe when stored below the stack
pointer. They do:
45da69: 48 89 6c 24 f0 mov %rbp,-0x10(%rsp)
45da6e: 48 8d 6c 24 f0 lea -0x10(%rsp),%rbp
45da73: e8 7d d0 ff ff callq 45aaf5 <runtime.duffzero+0x115>
45da78: 48 8b 6d 00 mov 0x0(%rbp),%rbp
This dance ensures that inside duffzero, it looks like there is a
proper frame pointer set up, so that stack walkbacks work correctly if
the kernel samples during duffzero.
However, this instruction sequence depends on data not being clobbered
even though it is below the stack pointer.
If there is an async interrupt at any of those last 3 instructions,
and the interrupt decides to insert a call to asyncPreempt, then the
saved frame pointer on the stack gets clobbered. The last instruction
above then restores junk to the frame pointer.
To prevent this, mark these instructions as async unsafe.
(The body of duffzero is already async unsafe, as it is in package runtime.)
Change-Id: I5562e82f9f5bd2fb543dcf2b6b9133d87ff83032
Reviewed-on: https://go-review.googlesource.com/c/go/+/248261
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The default ctrl+c handler should process exits in situations where it
makes sense, like console apps, but not in situations where it doesn't,
like libraries or services. Therefore, we should remove the exit(2) so
that the default handler is used for this. This also uses the more
proper windows exit code of STATUS_CONTROL_C_EXIT, with the base case
handler installed by KernelBase.dll. In particular, this helps in the
case of services, which previously would terminate when receiving
shutdown signals, instead of passing them onward to the service program.
In this CL, contrary to CL 244959, we do not need to special case
services with expensive detection algorithms, or rely on hard-coded
library/archive flags.
Fixes#40167.
Fixes#40074.
Change-Id: I9bf6ed6f65cefeff754d270aa33fa4df8d0b451f
Reviewed-on: https://go-review.googlesource.com/c/go/+/243597
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Currently, generated struct wrapper for closure is not handled in
mustHeapAlloc. That causes compiler crashes when the wrapper struct
is too large for stack, and must be heap allocated instead.
Fixes#39292
Change-Id: I14c1e591681d9d92317bb2396d6cf5207aa93e08
Reviewed-on: https://go-review.googlesource.com/c/go/+/244917
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
CL 230121 fixed the bug that struct literal blank fields type array/struct
can not be initialized. But it still misses some cases when an expression
causes "candiscard(value)" return false. When these happen, we recursively
call fixedlit with "var_" set to "_", and hit the bug again.
To fix it, just making splitnode return "nblank" whenever "var_" is "nblank".
Fixes#38905
Change-Id: I281941b388acbd551a4d8ca1a235477f8d26fb6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/232617
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Simplifying some code without compromising performance.
My CPU is Intel Xeon Gold 6161, 2.20GHz, 64-bit operating system.
The memory is 8GB. This is my test environment, I hope to help you judge.
Benchmark:
name old time/op new time/op delta
Log1p-4 21.8ns ± 5% 21.8ns ± 4% ~ (p=0.973 n=20+20)
Change-Id: Icd8f96f1325b00007602d114300b92d4c57de409
Reviewed-on: https://go-review.googlesource.com/c/go/+/233940
Reviewed-by: Robert Griesemer <gri@golang.org>
If the timeout triggers before writing to the done channel, the
goroutine will be blocked waiting for a corresponding read that’s
no longer existent, thus a goroutine leak. This change fixes that by
using a buffered channel instead.
Change-Id: I9cf4067a58bc5a729ab31e4426edd78bd359e8e0
GitHub-Last-Rev: a7d811a7be
GitHub-Pull-Request: golang/go#40236
Reviewed-on: https://go-review.googlesource.com/c/go/+/242902
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Adds parentheses so as to properly bind <- to the right most
channel.
This meant that previously given:
ChanOf(<-chan T)
it would mistakenly try to look up the type as
chan <-chan T
instead of
chan (<-chan T)
Fixes#39897
Change-Id: I8564916055f5fadde3382e41fe8820a1071e5f13
GitHub-Last-Rev: f8f2abe8d4
GitHub-Pull-Request: golang/go#39898
Reviewed-on: https://go-review.googlesource.com/c/go/+/240280
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Taking the live variable set from the last return point is problematic.
See #40629 for details, but there may not be a return point, or it may
be before the final defer.
Additionally, keeping track of the last call as a *Value doesn't quite
work. If it is dead-code eliminated, the storage for the Value is reused
for some other random instruction. Its live variable information,
if it is available at all, is wrong.
Instead, just mark all the open-defer argument slots as live
throughout the function. (They are already zero-initialized.)
Fixes#40629
Change-Id: Ie456c7db3082d0de57eaa5234a0f32525a1cce13
Reviewed-on: https://go-review.googlesource.com/c/go/+/247522
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
modload.Init initialized the build cache with the intent of providing
a better error message in Go 1.12, when the build cache became
mandatory (in module mode, packages aren't installed outside the build
cache). Unfortunately, this didn't provide a more descriptive error
(the cache calls base.Fatalf with its own message), and it caused
errors for commands that don't use the cache (like 'go mod edit').
This CL removes the cache initialization from modload.Init. The
builder will initialize it when it's needed.
For #39882
Change-Id: Ibc01ae4e59358dcd08a07ffc97bf556514d0366f
Reviewed-on: https://go-review.googlesource.com/c/go/+/240548
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
In CL 239797, str.GlobsMatchPath was copied to golang.org/x/mod/module
as MatchPrefixPatterns. This CL updates x/mod, switches calls to use
the new function, and deletes the old function.
For #38725
Change-Id: I7241032228b574aa539426a92d2f5aad9ee001e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/240061
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
modfetch.WriteGoSum now accepts a map[module.Version]bool parameter.
This is used to prevent some new sums from being saved to go.sum when
they would be removed by the next 'go mod tidy'. Previusly, sums were
saved for modules looked up during import resolution.
A new function, modload.TrimGoSum, is also introduced, which marks
sums for deletion. 'go mod tidy' now uses this. The new logic
distinguishes between go.mod sums and content sums, which lets 'go mod
tidy' delete sums for modules in the build graph but not the build
list.
Fixes#31580Fixes#36260Fixes#33008
Change-Id: I06c4125704a8bbc9969de05265967ec1d2e6d3e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/237017
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The Builder isn't needed by MkEnv, and Builder.Init doesn't have side
effects that change the environment. Builder.Init does currently call
CheckGOOSARCHPair, but that's being moved out in CL 234658.
Builder.Init creates the temporary work directory used by the
builder. For the builder created in MkEnv, this directory is never
used. Creating this directory can cause unnecessary errors for
commands that don't use a builder like 'go clean' and 'go list'.
Fixes#38395
Updates #24398
Change-Id: Ib93ae55afdf958000470657f4c4ff5bd92700e46
Reviewed-on: https://go-review.googlesource.com/c/go/+/236563
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The prior implementation used the format verb %v which unfortunately
improperly wrapped any underlying scanner errors, and we couldn't use
errors.Is nor errors.As. This change fixes that by using the %w verb.
Added a unit to ensure that both error sub string matching works, but
also that errors.Is works as expected.
Fixes#38099
Change-Id: Iea667041dd8081d961246f77f2542330417292dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/248337
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The optimization that replaces inline markers with pre-existing
instructions assumes that 'Prog' values produced by the compiler are
still reachable after the assembler has run. This was not true on
s390x where the assembler was removing NOP instructions from the
linked list of 'Prog' values. This led to broken inlining data
which in turn caused an infinite loop in the runtime traceback code.
Fix this by stopping the s390x assembler backend removing NOP
values. It does not make any difference to the output of the
assembler because NOP instructions are 0 bytes long anyway.
Fixes#40473.
Change-Id: Ib4fabadd1de8adb80421f75950ee9aad2111147a
Reviewed-on: https://go-review.googlesource.com/c/go/+/247697
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Switch pcdata over to content addressable symbols. This is the last
step before removing these from pclntab_old.
No meaningful benchmarks changes come from this work.
Change-Id: I3f74f3d6026a278babe437c8010e22992c92bd89
Reviewed-on: https://go-review.googlesource.com/c/go/+/247399
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
CL 246497 introduced bugs in gosym that the long tests caught. These two
bugs were:
1) In 1.16, 0 is now a valid file number from pcfile tables.
2) Also, in 1.16, when we scan all functions looking for a pc/file pair,
the values returned from pcfile are no longer the direct offset into
the file table. Rather, the values from pcfile are the offset into
the cu->file look-up table.
This CL fixes those two issues.
Change-Id: I0cd280bdcaeda89faaf9fac41809abdb87734499
Reviewed-on: https://go-review.googlesource.com/c/go/+/248317
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Previously, the assembler removed NOPs from the Prog list in
obj9.go. NOPs shouldn't be removed if they were added as
an inline mark, as described in the issue below.
Fixes#40689
Once the NOPs were left in the Prog list, some instructions
were flagged as invalid because they had an operand which was
not represented in optab. In order to preserve the previous
assembler behavior, entries were added to optab for those
operand cases. They were not flagged as errors before because
the NOP instructions were removed before the code to check the
valid opcode/operand combinations.
Change-Id: Iae5145f94459027cf458e914d7c5d6089807ccf8
Reviewed-on: https://go-review.googlesource.com/c/go/+/247842
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Keith Randall <khr@golang.org>
Minor cleanup: remove the symbol attribute AttrSeenGlobal, since it is
redundant with the existing attribute AttrOnList (no need to have what
amounts to a separate flag for checking the same property).
Change-Id: Ia269b64de37c2bb4a2314bbecf3d2091c6d57424
Reviewed-on: https://go-review.googlesource.com/c/go/+/239477
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Add a draft version of a blurb on improvements to the linker. This
will need to be finalized later in the release since there are still
some additional changes to be made to the linker in 1.16.
Updates #40703.
Change-Id: Id85c7e129071cc2faacb09c53a2968bd52b0a7b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/248238
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Go 1.14 included a (rather awful) workaround for a Linux kernel bug
that corrupted vector registers on x86 CPUs during signal delivery
(https://bugzilla.kernel.org/show_bug.cgi?id=205663). This bug was
introduced in Linux 5.2 and fixed in 5.3.15, 5.4.2 and all 5.5 and
later kernels. The fix was also back-ported by major distros. This
workaround was necessary, but had unfortunate downsides, including
causing Go programs to exceed the mlock ulimit in many configurations
(#37436).
We're reasonably confident that by the Go 1.16 release, the number of
systems running affected kernels will be vanishingly small. Hence,
this CL removes this workaround.
This effectively reverts CLs 209597 (version parser), 209899 (mlock
top of signal stack), 210299 (better failure message), 223121 (soft
mlock failure handling), and 244059 (special-case patched Ubuntu
kernels). The one thing we keep is the osArchInit function. It's empty
everywhere now, but is a reasonable hook to have.
Updates #35326, #35777 (the original register corruption bugs).
Updates #40184 (request to revert in 1.15).
Fixes#35979.
Change-Id: Ie213270837095576f1f3ef46bf3de187dc486c50
Reviewed-on: https://go-review.googlesource.com/c/go/+/246200
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In Go 1.15 we switched the default linking mode for PIE on
Linux/AMD64 and Linux/ARM64 to internal linking. Clarify that
the previous behavior (external linking) can still be used with
a flag.
Fixes#40719.
Change-Id: Ib7042622bc91e1b1aa31f520990d03b5eb6c56bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/248199
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In the dev.link branch we have continued developing the new object
file format support and the linker improvements described in
https://golang.org/s/better-linker . Since the last merge (May 1st
2020), more progress has been made to improve the new linker, with
improvements on both linker speed and memory usage.
Fixes#40703.
Change-Id: I9924ea88d981845c3a40ec8c25820120fc21c003
This change propagates context into PackagesForErrors and Do for
the purpose of tracing, and calls trace.StartSpan on PackagesForErrors
and Do, so that the trace now shows the broad outline of where
the "Loading" and "Execution" phases are in the build.
Updates #38714
Change-Id: Ib9a7cf7030210f68f76663d1c8a7461e0a226611
Reviewed-on: https://go-review.googlesource.com/c/go/+/238541
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The ViewerEvent, ViewerData and ViewerFrame structs are moved into
cmd/internal/traceviewer, and renamed Event, Data, and Frame.
The structs are the same, except for the following: A definition
for the JSON "bp" field that's defined in the trace format, but
missing in the structs has been added. Also, the Tid and Pid fields
on Event have been renamed TID and PID to better match Go style.
Finally, the footer field on ViewerData, which hasn't been used
for a while, has been removed.
This CL is in preparation for the usage of these structs by cmd/go's
tracing functionality.
Updates #38714
Change-Id: I345f23617b96d4629b876ae717f89d56a67e05a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/239098
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
While working on deduplicating pcdata, I found that the following hashed
symbols would result in the same:
[] == [0,0,0,0....]
This makes using content addressable symbols untenable for pcdata.
Adding the length to the hash keeps the dream alive.
No difference in binary size (darwin, cmd/compile), spurious
improvements in DWARF phase memory.
Change-Id: I21101f7754a3d870922b0dea39c947cc8509432f
Reviewed-on: https://go-review.googlesource.com/c/go/+/247903
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Creates two new symbols: runtime.cutab, and runtime.filetab, and strips
the filenames out of runtime.pclntab_old.
All stats are for cmd/compile.
Time:
Pclntab_GC 48.2ms ± 3% 45.5ms ± 9% -5.47% (p=0.004 n=9+9)
Alloc/op:
Pclntab_GC 30.0MB ± 0% 29.5MB ± 0% -1.88% (p=0.000 n=10+10)
Allocs/op:
Pclntab_GC 90.4k ± 0% 73.1k ± 0% -19.11% (p=0.000 n=10+10)
live-B:
Pclntab_GC 29.1M ± 0% 29.2M ± 0% +0.10% (p=0.000 n=10+10)
binary sizes:
NEW: 18565600
OLD: 18532768
The size differences in the binary are caused by the increased size of
the Func objects, and (less likely) some extra alignment padding needed
as a result. This is probably the maximum increase in size we'll size
from the pclntab reworking.
Change-Id: Idd95a9b159fea46f7701cfe6506813b88257fbea
Reviewed-on: https://go-review.googlesource.com/c/go/+/246497
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This template is based on CL 220278 and previous ones like it.
Include Compiler and Linker sections proactively, they can be
removed if they don't end up being needed for Go 1.16.
Use two spaces of indentation for TODOs to set a better precedent
for the final text that will take its place.
'relnote -html' does not report any changes at this time.
For #40700.
Change-Id: I096b0ce0d33aaaa6fae9c91c0d2dfb89b9c5e94c
Reviewed-on: https://go-review.googlesource.com/c/go/+/248198
Reviewed-by: Carlos Amedee <carlos@golang.org>
This is the start of the Go 1.16 development cycle, so update the
Version value accordingly. It represents the Go 1.x version that
will soon open up for development (and eventually become released).
Historically, we used to bump this at an arbitrary time throughout
the development cycle, but it's better to be more predictable about
updating it. The start of a development cycle should be the most
appropriate time: it clearly marks the boundary between 1.15 and
1.16 development, and doing it early can help catch issues in other
tooling. See issue #38704 for more background.
There is no longer a need to update the list of Go versions in
src/go/build/doc.go because it does not exist as of CL 232981.
For #40705.
Updates #38704.
Updates #37018.
Change-Id: Id8ee733b5e79c53b6cd03509c6560614d8743833
Reviewed-on: https://go-review.googlesource.com/c/go/+/248038
Reviewed-by: Carlos Amedee <carlos@golang.org>
CL 245485 introduced a map for used files in a function. When
numbering symbols, make sure we traverse the files in
deterministic order.
Should fix longtest builders.
Change-Id: I1006bc5425116ab40e33a61e8f5acd1bdb4abad9
Reviewed-on: https://go-review.googlesource.com/c/go/+/247997
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Read Go object files using cmd/internal/goobj2 package directly,
instead of using cmd/internal/goobj as an intermediate layer.
Now cmd/internal/archive is only about reading archives.
Change-Id: Ifecb217fb26c16c26fc1bbc3fba0ed44710020ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/246443
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Rename cmd/internal/goobj package to cmd/internal/archive. This
is in preparation of a refactoring of object and archive file
reading packages.
With this CL, the cmd/internal/archive contains logic about
reading Go object files. This will be moved to other places in
later CLs.
Change-Id: Ided7287492a4766183d6e49be840a7f361504d1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/246442
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This update was created using the updatecontrib command:
go get golang.org/x/build/cmd/updatecontrib
cd gotip
updatecontrib
With manual changes based on publicly available information
to canonicalize letter case and formatting for a few names.
For #12042.
Change-Id: I66dc5ee28d9a64bc9d150e72d136d8f71e50373b
Reviewed-on: https://go-review.googlesource.com/c/go/+/247767
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Currently, nanotime1 (and walltime1) is not reentrant, in that it
sets m.vdsoSP at entry and clears it at exit. If a signal lands
in between, and nanotime1 is called from the signal handler, it
will clear m.vdsoSP while we are still in nanotime1. If (in the
unlikely event) it is signaled again, m.vdsoSP will be wrong,
which may cause the stack unwinding code to crash.
This CL makes it reentrant, by saving/restoring the previous
vdsoPC and vdsoSP, instead of setting it to 0 at exit.
TODO: have some way to test?
Change-Id: I9ee53b251f1d8a5a489c71d4b4c0df1dee70c3e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/246763
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
In order to prevent renumbering of filenames in pclntab generation, use
the per-package file list (previously only used for DWARF generation) as
file-indices. This is the largest step to eliminate renumbering of
filenames in pclntab.
Note, this is probably not the final state of the file table within the
object file. In this form, the linker loads all filenames for all
objects. I'll move to storing the filenames as regular string
symbols,and defaulting all string symbols to using the larger hash value
to make generation of pcln simplest, and most memory friendly.
Change-Id: I23daafa3f4b4535076e23100200ae0e7163aafe0
Reviewed-on: https://go-review.googlesource.com/c/go/+/245485
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Add a new PPC64-only linker test that does a build with the
-debugppc64textsize debugging option (selecting a lower the threshold
for text section splitting) to verify that no bugs have been
introduced in the linker code that manages this process.
Change-Id: Iea3f16a04c894d528eab2cb52f1ec1d75a2770cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/241499
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Add a new debugging command line option (-debugppc64textsize=N) that
forces the start of a new text section after ".text" hits N bytes as
opposed to the architected limit of 2^26. This is intended to enable
testing of the linker code paths that handle multiple .text sections
on PPC64 without resorting to building giant applications.
Updates #20492.
Change-Id: I74ab7fd1e412e9124de5bd0d8d248c5e73225ae3
Reviewed-on: https://go-review.googlesource.com/c/go/+/241073
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The code in the the linker's genelfsym() routine was not properly
including runtime.text.%d marker symbols that are emitted on PPC64
when a very large text section is split into chunks. This bug was
introduced in CL 233338 when portions of asmb2() were converted
from sym.Symbol to loader.Sym usage.
Change-Id: Idfed944c41e1805f78f35be67bcdd18bdefd7819
Reviewed-on: https://go-review.googlesource.com/c/go/+/241498
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This CL ensures that ReadUvarint consumes only a limited
amount of input (instead of an unbounded amount).
On some inputs, ReadUvarint could read an arbitrary number
of bytes before deciding to return an overflow error.
After this CL, ReadUvarint returns that same overflow
error sooner, after reading at most MaxVarintLen64 bytes.
Fix authored by Robert Griesemer and Filippo Valsorda.
Thanks to Diederik Loerakker, Jonny Rhea, Raúl Kripalani,
and Preston Van Loon for reporting this.
Fixes#40618
Fixes CVE-2020-16845
Change-Id: Ie0cb15972f14c38b7cf7af84c45c4ce54909bb8f
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/812099
Reviewed-by: Filippo Valsorda <valsorda@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/247120
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
After golang.org/cl/228784 setLoadPackageDataError tries to decide whether an
error is caused by an imported package or an importing package by examining the
error itself to decide. Ideally, the errors themselves would belong to a
specific interface or some other property to make it unambiguous that they
were import errors. Since they don't, setLoadPackageDataError just checked
for nogoerrors and classified all other errors as import errors. But
it missed scanner errors which are also "caused" by the imported
package.
Fixes#40544
Change-Id: I39159bfdc286bee73697decd07b8aa9451f2db06
Reviewed-on: https://go-review.googlesource.com/c/go/+/246717
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Use the original *Request in the reqCanceler map, not the transient
wrapper created to handle body rewinding.
Change the key of reqCanceler to a struct{*Request}, to make it more
difficult to accidentally use the wrong request as the key.
Fixes#40453.
Change-Id: I4e61ee9ff2c794fb4c920a3a66c9a0458693d757
Reviewed-on: https://go-review.googlesource.com/c/go/+/245357
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
On AIX, container symbols are handled in a weird way (unlike
other platforms): the outer symbol needs to have size (but still
no data), and the inner symbols must not be in the symbol table
(otherwise it overlaps with the outer symbol, which the system
linker doesn't like).
As of CL 241598, pclntab becomes a container symbol. We need to
follow the rule above for AIX.
Fix AIX build.
Change-Id: Ie2515a4cabbd8cf3f6d3868643a28f64ca3365a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/246479
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently, at compile time, for each itab symbol, we create an
"itablink" symbol which holds solely the address of the itab
symbol. At link time, all the itablink symbols are grouped
together to form the itablinks slice.
This CL removes the itablink symbols, and directly generate the
itablinks slice in the linker. This removes a number of symbols,
which are dupOK and generally have long names. And also removes
a special handling of itablink symbols in the deadcode pass which
iterates through all symbols.
Change-Id: I475c3c8899e9fbeec9abc7647b1e4a69aa5c3c5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/245901
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The hash maps are used to deduplicate hashed symbols. Once we
loaded all the symbols, we no longer need the hash maps. Drop
them.
Linking cmd/compile,
name old live-B new live-B delta
Loadlib_GC 13.1M ± 0% 11.3M ± 0% -13.62% (p=0.008 n=5+5)
Change-Id: I4bb1f84e1111a56d9e777cd6a68f7d974b60e321
Reviewed-on: https://go-review.googlesource.com/c/go/+/245721
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Extend the content-addressable symbol mechanism to itab symbols.
Itab symbols require global uniqueness (as at run time we compare
pointers), so it needs to be reliably deduplicated. Currently the
content hash depends on symbol name expansion, so we can only do
this when all Go packages are built with know package paths. Fall
back to checking names if any Go package is built with unknown
package path.
Change-Id: Icf5e8873755050c20e5fc6549f6de1c883254c89
Reviewed-on: https://go-review.googlesource.com/c/go/+/245719
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The type descriptor symbol of a defined (named) type (and pointer
to it) is defined only in the package that defines the type. It
is not dupOK, unlike other type descriptors. So it can be
referenced by index. Currently it is referenced by name for
cross-package references, because the index is not exported and
so not known to the referencing package.
This CL passes the index through the export data, so the symbol
can be referenced by index, and does not need to be looked up by
name. This also makes such symbol references consistent: it is
referenced by index within the defining package and also cross-
package, which makes it easier for content hashing (in later CLs).
One complication is that we need to set flags on referenced
symbols (specifically, the UsedInIface flag). Before, they are
non-package refs, which naturally carry flags in the object file.
For indexed refs, we currently don't put their flags in the
object file. Introduce a new block for this.
Change-Id: I8126f8e318ac4e6609eb2ac136201fd6c264c256
Reviewed-on: https://go-review.googlesource.com/c/go/+/245718
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Leaving creation of the funcID till the linker requires the linker to
load the function and file names into memory. Moving these into the
compiler/assembler prevents this.
This work is a step towards moving all func metadata into the compiler.
Change-Id: Iebffdc5a909adbd03ac263fde3f4c3d492fb1eac
Reviewed-on: https://go-review.googlesource.com/c/go/+/244024
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
The .syso test also fails for ppc64le. Not sure why. For now, just
disable the test for that architecture. The test really only needs to
run on a single builder of any arch.
Change-Id: I346cdc01ada09d43c4c504fbc30be806f59d5422
Reviewed-on: https://go-review.googlesource.com/c/go/+/246358
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For dupOK symbols, their attributes should be OR'd. Most of the
attributes are expected to be set consistently across multiple
definitions, but UsedInIface must be OR'd, and for alignment we
need to pick the largest one. Currently the attributes are not
always OR'd, depending on addSym returning true or false. This
doesn't cause any real problem, but it would be a problem if we
make type descriptor symbols content-addressable.
This CL removes the second result of addSym, and lets preloadSyms
always set the attributes. Also removes the alignment handling on
addSym, handles it in preloadSyms only.
Change-Id: I06b3f0adb733f6681956ea9ef54736baa86ae7bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/245720
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Consider this test package:
package p
// enum E { E0 };
// union U { long x; };
// void f(enum E e, union U* up) {}
import "C"
func f() {
C.f(C.enum_E(C.E0), (*C.union_U)(nil))
}
In Go 1.14, cgo translated this to (omitting irrelevant details):
type _Ctype_union_U [8]byte
func f() {
_Cfunc_f(uint32(_Ciconst_E0), (*[8]byte)(nil))
}
func _Cfunc_f(p0 uint32, p1 *[8]byte) (r1 _Ctype_void) { ... }
Notably, _Ctype_union_U was declared as a defined type, but uses were
being rewritten into uses of the underlying type, which matched how
_Cfunc_f was declared.
After CL 230037, cgo started consistently rewriting "C.foo" type
expressions as "_Ctype_foo", which caused it to start emitting:
type _Ctype_enum_E uint32
type _Ctype_union_U [8]byte
func f() {
_Cfunc_f(_Ctype_enum_E(_Ciconst_E0), (*_Ctype_union_U)(nil))
}
// _Cfunc_f unchanged
Of course, this fails to type-check because _Ctype_enum_E and
_Ctype_union_U are defined types.
This CL changes cgo to emit:
type _Ctype_enum_E = uint32
type _Ctype_union_U = [8]byte
// f unchanged since CL 230037
// _Cfunc_f still unchanged
It would probably be better to fix this in (*typeConv).loadType so
that cgo generated code uses the _Ctype_foo aliases too. But as it
wouldn't have any effect on actual compilation, it's not worth the
risk of touching it at this point in the release cycle.
Updates #39537.
Fixes#40494.
Change-Id: I88269660b40aeda80a9a9433777601a781b48ac0
Reviewed-on: https://go-review.googlesource.com/c/go/+/246057
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently pageAlloc.find attempts to find a better estimate for the
first free page in the heap, even if the space its looking for isn't
necessarily going to be the first free page in the heap (e.g. if npages
>= 2). However, in doing so it has the potential to return a searchAddr
candidate that doesn't actually correspond to mapped memory, but this
candidate might still be adopted. As a result, pageAlloc.alloc's fast
path may look at unmapped summary memory and segfault. This case is rare
on most operating systems since the heap is kept fairly contiguous, so
the chance that the candidate searchAddr discovered is unmapped is
fairly low. Even so, this is totally possible and outside the user's
control when it happens (in fact, it's likely to happen consistently for
a given user on a given system).
Fix this problem by ensuring that our candidate always points to mapped
memory. We do this by looking at mheap's arenas structure first. If it
turns out our candidate doesn't correspond to mapped memory, then we
look at inUse to round up the searchAddr to the next mapped address.
While we're here, clean up some documentation related to searchAddr.
Fixes#40191.
Change-Id: I759efec78987e4a8fde466ae45aabbaa3d9d4214
Reviewed-on: https://go-review.googlesource.com/c/go/+/242680
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We're reworking pclntab generation in the linker, and with that we're
moving FuncID generation in to the compiler. Determining the FuncID is
done by a lookup on the package.function name; therefore, we need the
package whenever we make the TEXT symbols.
Change-Id: I805445ffbf2f895f06ce3a91fb09126d012bf86e
Reviewed-on: https://go-review.googlesource.com/c/go/+/245318
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Move the function names out of runtime.pclntab_old, creating
runtime.funcnametab. There is an unfortunate artifact in this change in
that calculating the funcID still requires loading the name. Future work
will likely pull this out and put it into the object file Funcs.
ls -l cmd/compile (darwin):
before: 18524016
after: 18519952
The difference in size can be attributed to alignment in pclntab_old.
Change-Id: Ibcbb230d4632178f8fcd0667165f5335786381f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/243223
Reviewed-by: Austin Clements <austin@google.com>
Non functional change.
As runtime.pclntab breaks up, it'll be easier if we can just pass around
the pclntab state. Also, eliminate the globals in pclntab.
Change-Id: I2a5849e8f5f422a336a881e53a261e3997d11c44
Reviewed-on: https://go-review.googlesource.com/c/go/+/242599
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
As of July 2020, a fair amount of the new linker's live memory, and
runtime is spent generating pclntab. In an effort to streamline that
code, this change starts breaking up the generation of runtime.pclntab
into smaller chunks that can run later in a link. These changes are
described in an (as yet not widely distributed) document that lays out
an improved format. Largely the work consists of breaking up
runtime.pclntab into smaller pieces, stopping much of the data
rewriting, and getting runtime.pclntab into a form where we can reason
about its size and look to shrink it. This change is the first part of
that work -- just pulling out the header, and demonstrating where a
majority of that work will be.
Change-Id: I65618d0d0c780f7e5977c9df4abdbd1696fedfcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/241598
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
The symbol's data in the object file (sym.P) may already not
contain trailing zeros (e,g, for [10]int{1}), but sometimes it
does (e.g. for [10]int{1,0}). The linker can already handle this
case. We just always trim the trailing zeros for content hashing,
so it can deduplicate [10]int{1} and [10]int{1,0}.
Note: in theory we could just trim the zeros in the symbol data
as well. But currently the linker depends on reading symbol data
for certain symbols (e.g. type symbol decoding), and trimming
will complicates things in the linker.
Change-Id: I9e90e41e6ac808b36855b0713a85e61c33bf093a
Reviewed-on: https://go-review.googlesource.com/c/go/+/245717
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently in addLocalInductiveFacts, we only check whether
direct edge from if block to phi block exists. If not, the
following logic will treat the phi block as the first successor,
which is wrong.
This patch makes prove pass more conservative, so we disable
some cases in test/prove.go. We will do some optimization in
the following CL and enable these cases then.
Fixes#40367.
Change-Id: I27cf0248f3a82312a6f7dabe11c79a1a34cf5412
Reviewed-on: https://go-review.googlesource.com/c/go/+/244579
Reviewed-by: Zach Jones <zachj1@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We have Reloc and Reloc2. Reloc2 is the better approach and most
code uses Reloc2. There are still uses of Reloc. This CL migrates
them to Reloc2, and removes Reloc.
Change-Id: Id5f6a6019e1e044add682d05e70ebb1548ec58d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/245577
Reviewed-by: Jeremy Faller <jeremy@golang.org>
We used to generate all external relocations in memory, then emit
the relocation records at a later pass. The data structures were
chosen so that it takes as little memory as possible. Now we just
stream out external relocations, and ExtReloc is just a local
variable. Change the data structure to avoid repeated read of
some fields. Also get rid of ExtRelocView, as it is no longer
necessary.
Change-Id: I40209bbe4387af231b29788125c3b4ebb0ff4a33
Reviewed-on: https://go-review.googlesource.com/c/go/+/245479
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This reverts CL 202578 and CL 230677 which added an optimization
to use KDSA when available on s390x.
Inconsistencies have been found between the two implementations
in their handling of certain edge cases. Since the Go 1.15 release
is extremely soon it seems prudent to remove this optimization
for now and revisit it in a future release.
Fixes#40475.
Change-Id: Ifb2ed9b9e573784df57383671f1c29d8abae90d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/245497
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ruixin(Peter) Bao <ruixin.bao@ibm.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
We accidentally passed the address of a local to a function
pointer, where we should pass the address of a global.
Linking cmd/compile with external linking:
Asmb2_GC 32.5ms ± 5% 21.6ms ± 3% -33.57% (p=0.016 n=5+4)
Asmb2_GC 29.2MB ± 0% 6.4MB ± 0% -78.20% (p=0.008 n=5+5)
Asmb2_GC 1.43M ± 0% 0.00M ± 4% -99.98% (p=0.008 n=5+5)
Change-Id: I4754189bcc20f824627d95858ba35285d53c614d
Reviewed-on: https://go-review.googlesource.com/c/go/+/245337
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
If no M is available, startm first grabs an idle P, then drops
sched.lock and calls newm to start a new M to run than P.
Unfortunately, that leaves a window in which a G (e.g., returning from a
syscall) may find no idle P, add to the global runq, and then in stopm
discover that there are no running M's, a condition that should be
impossible with runnable G's.
To avoid this condition, we pre-allocate the new M ID in startm before
dropping sched.lock. This ensures that checkdead will see the M as
running, and since that new M must eventually run the scheduler, it will
handle any pending work as necessary.
Outside of startm, most other calls to newm/allocm don't have a P at
all. The only exception is startTheWorldWithSema, which always has an M
if there is 1 P (i.e., the currently running M), and if there is >1 P
the findrunnable spinning dance ensures the problem never occurs.
This has been tested with strategically placed sleeps in the runtime to
help induce the correct race ordering, but the timing on this is too
narrow for a test that can be checked in.
Fixes#40368
Change-Id: If5e0293a430cc85154b7ed55bc6dadf9b340abe2
Reviewed-on: https://go-review.googlesource.com/c/go/+/245018
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
During the transitioning period, we mark symbols from Go shared
libraries reachable unconditionally. That might be useful when
there was still a large portion of the linker using sym.Symbols,
and only reachable symbols were converted to sym.Symbols. Marking
them reachable brings them to the dynamic symbol table, even if
they are not needed, increased the binary size unexpectedly.
That time has passed. Now we largely operate on loader symbols,
and it is not needed to mark them reachable anymore.
Fixes#40416.
Change-Id: I1e2bdb93a960ba7dc96575fabe15af93d8e95329
Reviewed-on: https://go-review.googlesource.com/c/go/+/244839
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Do them in the same CL so ARM's archreloc doesn't need to support
both streaming and non-streaming.
TODO: we haven't switched to using mmap to emit external
relocations on Windows.
Change-Id: Ica2ee89c03fc74839efd6b9e26c80585fcdce45c
Reviewed-on: https://go-review.googlesource.com/c/go/+/244357
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
OutData was used for a symbol to point to its data in the output
buffer, in order to apply relocations. Now we fold relocation
application to Asmb next to symbol data writing. We can just pass
the output data as a local variable.
Linking cmd/compile,
name old time/op new time/op delta
Asmb_GC 19.0ms ±10% 16.6ms ± 9% -12.50% (p=0.032 n=5+5)
name old alloc/op new alloc/op delta
Asmb_GC 3.78MB ± 0% 0.14MB ± 1% -96.41% (p=0.008 n=5+5)
name old live-B new live-B delta
Asmb_GC 27.5M ± 0% 23.9M ± 0% -13.24% (p=0.008 n=5+5)
Change-Id: Id870a10dce2a0a7447a05029c6d0ab39b47d0a12
Reviewed-on: https://go-review.googlesource.com/c/go/+/244017
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Support streaming external relocations on ARM64. Support
architecture-specific relocations.
Also support streaming external relocations on Darwin. Do it in
the same CL so ARM64's archreloc doesn't need to support both
streaming and non-streaming.
Change-Id: Ia7fee9957892f98c065022c69a51f47402f4d6e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/243644
Reviewed-by: Jeremy Faller <jeremy@golang.org>
For content-addressable symbols, we build its content hash based
on the symbol data and relocations. When the compiler builds the
symbol data, it may not always include the trailing zeros, e.g.
the data of [10]int64{1,2,3} is only the first 24 bytes.
Therefore, we may end up with symbols with the same contents
(thus same hash) but different sizes. This is not actually a hash
collision. In this case, we can deduplicate them and keep the one
with the larger size.
Change-Id: If6834542d7914cc00f917d7db151955e5aee6f30
Reviewed-on: https://go-review.googlesource.com/c/go/+/243718
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
For content-addressable symbols with relocations, we build a
content hash based on its content and relocations. Depending on
the category of the referenced symbol, we choose different hash
algorithms such that the hash is globally consistent.
For now, we only support content-addressable symbols with
relocations when the current package's import path is known, so
that the symbol names are fully expanded. Otherwise, if the
referenced symbol is a named symbol whose name is not fully
expanded, the hash won't be globally consistent, and can cause
erroneous collisions. This is fine for now, as the deduplication
is just an optimization, not a requirement for correctness (until
we get to type descriptors).
Change-Id: I639e4e03dd749b5d71f0a55c2525926575b1ac30
Reviewed-on: https://go-review.googlesource.com/c/go/+/243142
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
For now, we only do this for symbols without relocations.
Mark static temps "local", as they are not referenced across DSO
boundaries. And deduplicating a local symbol and a non-local
symbol can be problematic.
Change-Id: I0a3dc4138aaeea7fd4f326998f32ab6305da8e4b
Reviewed-on: https://go-review.googlesource.com/c/go/+/243141
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The StdFormat flag was added as part of CL 231461, where the primary aim
was to fix the bug #37476. It's expected that the existing printer modes
only adjust spacing but do not change any of the code text itself. A new
printing flag served as a way for cmd/gofmt and go/format to delegate
a part of formatting work to the printer—where it's more more convenient
and efficient to perform—while maintaining current low-level printing
behavior of go/printer unmodified.
We already have cmd/gofmt and the go/format API that implement standard
formatting of Go source code, so there isn't a need to expose StdFormat
flag to the world, as it can only cause confusion.
Consider that to format source in canonical gofmt style completely it
may require tasks A, B, C to be done. In one version of Go, the printer
may do both A and B, while cmd/gofmt and go/format will do the remaining
task C. In another version, the printer may take on doing just A, while
cmd/gofmt and go/format will perform B and C. This makes it hard to add
a gofmt-like mode to the printer without compromising on above fluidity.
This change prefers to shift back some complexity to the implementation
of the standard library, allowing us to avoid creating the new exported
printing flag just for the internal needs of gofmt and go/format today.
We may still want to re-think the API and consider if something better
should be added, but unfortunately there isn't time for Go 1.15. We are
not adding new APIs now, so we can defer this decision until Go 1.16 or
later, when there is more time.
For #37476.
For #37453.
For #39489.
For #37419.
Change-Id: I0bb07156dca852b043487099dcf05c5350b29e20
Reviewed-on: https://go-review.googlesource.com/c/go/+/240683
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
While investigating #34121, fixed by CL 193605,
I discovered another case where Reset was not quite
resetting enough.
This specific case is not a problem in Reset itself but
rather that the Huffman bit writer in one code path
is using uninitialized memory left over from a previous
block, making the compression not choose the optimal
compression method.
Fixes#34121.
Change-Id: I29245b28214d924e382f91e2c56b4b8a9b7da13d
Reviewed-on: https://go-review.googlesource.com/c/go/+/243140
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Currently, when external linking, in relocsym (in asmb pass), we
convert Go relocations to an in-memory representation of external
relocations, and then in asmb2 pass we write them out to the
output file. This is not memory efficient.
This CL makes it not do the conversion but directly stream out
the external relocations based on Go relocations. Currently only
do this on AMD64 ELF systems.
This reduces memory usage, but makes the asmb2 pass a little
slower.
Linking cmd/compile with external linking:
name old time/op new time/op delta
Asmb_GC 83.8ms ± 7% 70.4ms ± 4% -16.03% (p=0.008 n=5+5)
Asmb2_GC 95.6ms ± 4% 118.2ms ± 5% +23.65% (p=0.008 n=5+5)
TotalTime_GC 1.59s ± 2% 1.62s ± 1% ~ (p=0.151 n=5+5)
name old alloc/op new alloc/op delta
Asmb_GC 26.0MB ± 0% 4.1MB ± 0% -84.15% (p=0.008 n=5+5)
Asmb2_GC 8.19MB ± 0% 8.18MB ± 0% ~ (p=0.222 n=5+5)
name old live-B new live-B delta
Asmb_GC 49.2M ± 0% 27.4M ± 0% -44.38% (p=0.008 n=5+5)
Asmb2_GC 51.5M ± 0% 29.7M ± 0% -42.33% (p=0.008 n=5+5)
TODO: figure out what is slow. Possible improvements:
- Remove redundant work in relocsym.
- Maybe there is a better representation for external relocations
now.
- Fine-grained parallelism in emitting external relocations.
- The old elfrelocsect only iterates over external relocations,
now we iterate over all relocations. Is it too many?
Change-Id: Ib0a8ee8c88d65864c62b89a8d634614f7f2c813e
Reviewed-on: https://go-review.googlesource.com/c/go/+/242603
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
For symbols of size 8 bytes or below, we can map them to 64-bit
hash values using the identity function. There is no need to use
longer and more expensive hash functions.
For them, we introduce another pseudo-package, PkgIdxHashed64. It
is like PkgIdxHashed except that the hash function is different.
Note that the hash value is not affected with trailing zeros,
e.g. "A" and "A\0\0\0" have the same hash value. This allows
deduplicating a few more symbols. When deduplicating them, we
need to keep the longer one.
Change-Id: Iad0c2e9e569b6a59ca6a121fb8c8f0c018c6da03
Reviewed-on: https://go-review.googlesource.com/c/go/+/242362
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Fill in the data at compile time, and get rid of the preprocess
function in the linker.
We need to be careful with symbol alignment: data symbols are
generally naturally aligned, except for string symbols which are
not aligned. When deduplicating two symbols with same content but
different alignments, we need to keep the biggest alignment.
Change-Id: I4bd96adfdc5f704b5bf3a0e723457c9bfe16a684
Reviewed-on: https://go-review.googlesource.com/c/go/+/242081
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This CL introduces content-addressable symbols (a.k.a. hashed
symbols) to object files. Content-addressable symbols are
identified and referenced by their content hashes, instead of by
names.
In the object file, a new pseudo-package index PkgIdxHashed is
introduced, for content-addressable symbols, and a new block is
added to store their hashes. The hashes are used by the linker to
identify and deduplicate the symbols.
For now, we only support content-addressable symbols that are
always locally defined (i.e. no cross-package references).
As a proof of concept, make string constant symbols content-
addressable.
Change-Id: Iaf53efd74c0ffb54fa95f784628cc84e95844536
Reviewed-on: https://go-review.googlesource.com/c/go/+/242079
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
When using the platform verifier on Windows (because Roots is nil) we
were always enforcing server auth EKUs if DNSName was set, and none
otherwise. If an application was setting KeyUsages, they were not being
respected.
Started correctly surfacing IncompatibleUsage errors from the system
verifier, as those are the ones applications will see if they are
affected by this change.
Also refactored verify_test.go to make it easier to add tests for this,
and replaced the EKULeaf chain with a new one that doesn't have a SHA-1
signature.
Thanks to Niall Newman for reporting this.
Fixes#39360
Fixes CVE-2020-14039
Change-Id: If5c00d615f2944f7d57007891aae1307f9571c32
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/774414
Reviewed-by: Katie Hockman <katiehockman@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/242597
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Copy and adapt tests from text/template, to exercise more of html/template's copy.
Various differences in behavior are flagged with NOTE comments or t.Skip
and documented in #40075. Many of them are probably bugs.
One clarifying test case added to both text/template and html/template.
No changes to the package itself.
Change-Id: Ifefad83d647db846040d24c2741a0244b00ade82
Reviewed-on: https://go-review.googlesource.com/c/go/+/241084
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The special case is no longer needed, didn't actually work, and
we no longer even save this map anywhere (see CL 240621 for more
information).
Change-Id: I19bcf32cace22decf50fd6414d4519cc51cbb0be
Reviewed-on: https://go-review.googlesource.com/c/go/+/241982
Reviewed-by: Austin Clements <austin@google.com>
After Dial timeout, force close the TCP connection by writing "hangup"
to the control file. This unblocks the "connect" command if the
connection is taking too long to establish, and frees up the control
file FD.
Fixes#40118
Change-Id: I1cef8539cd9fe0793e32b49c9d0ef636b4b26e1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/241638
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
Set the AttrStatic flag on compiler-emitted TOC symbols for ppc64; these
symbols don't need to go into the final symbol table in Go binaries.
This fixes a buglet introduced by CL 240539 that was causing failures
on the aix builder.
Change-Id: If8b63bcf6d2791f1ec5a0c371d2d11e806202fd2
Reviewed-on: https://go-review.googlesource.com/c/go/+/241637
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It is called by the signal handler before switching to gsignal
(sigtrampgo -> sigfwdgo -> dieFromSignal -> raise)
which means that it must not split the stack.
All other instances of raise are already marked nosplit.
Fixes#40076
Change-Id: I4794491331af48c46d0d8ebc82d34c6483f0e6cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/241121
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Use of a nil *File as an argument should not result in a panic,
but result in the ErrInvalid error being returned.
Fix the copy_file_range implementation to preserve this semantic.
Fixes#40115
Change-Id: Iad5ac39664a3efb7964cf55685be636940a8db13
Reviewed-on: https://go-review.googlesource.com/c/go/+/241417
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Don't emit symbol table entries for compiler-generated file-local
symbols (this category includes .stmp_* temporaries and *.stkobj
symbols). Note that user-written static symbols within assembler
sources will still be added to the symbol table. Apply the same test
when emitting DWARF for global variables.
Change-Id: I4db77a2750a0b575e051dfea895c4742cf6709a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/240539
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Mark compiler-generated ".stmp_%d" and "<fn>.stkobj" symbols as
AttrStatic, so as to tell the linker that they do not need to be
inserted into its name lookup tables.
Change-Id: I59ffd11659b2c54c2d0ad41275d05c3f919e3b88
Reviewed-on: https://go-review.googlesource.com/c/go/+/240497
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
I'm from Hootsuite. We're a Canadian tech company who provides products
and services to businesses, organizations and individuals to really help
them succeed on social. We have leveraged Go in our stack for the past
4+ years. I am super happy to give back to Go on behalf of Hootsuite
through a small contribution to pkgsite (with a few more in the works).
We love this project and we love open source :)
Hopefully we can give back more in the future!
Kush
Change-Id: Id534a41d78e17e1fa48a8ddecd1ca110cf812388
GitHub-Last-Rev: 297b8b06e7
GitHub-Pull-Request: golang/go#40088
Reviewed-on: https://go-review.googlesource.com/c/go/+/241218
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Since Plan 9 doesn't allow us to listen on 0.0.0.0, the Listener
address that's read in from /net is the IPv6 address ::. Convert
this address to 0.0.0.0 when the network is tcp4 or udp4.
Fixes#40045
Change-Id: Icfb69b823e5b80603742d23c3762a812996fe43f
Reviewed-on: https://go-review.googlesource.com/c/go/+/240918
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
This doesn't change how ExtraNames are printed, so as not to cause
unnecessary churn of current outputs. Switched the ExtraNames check to a
nil check as we are checking for just-parsed values.
Fixes#39924Fixes#39873
Change-Id: Ifa07cfc1a057d73643710a774ef8a154222db187
Reviewed-on: https://go-review.googlesource.com/c/go/+/240543
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
TestDependencies defines the dependency policy
(what can depend on what) for the standard library.
The standard library has outgrown the idea of writing
the policy as a plain map literal. Also, the checker was
ignoring vendored packages, which makes it miss real
problems.
This commit adds a little language for describing
partial orders and rewrites the policy in that language.
It also changes the checker to look inside vendored
packages and adds those to the policy as well.
This turned up one important problem: net is depending
on fmt, unicode via golang.org/x/net/dns/dnsmessage,
filed as #40070.
This is a test-only change, so it should be appropriate
even for the release freeze, especially since it identified
a real bug.
Change-Id: I9b79f30761f167b8587204c959baa973583e39f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/241078
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Following CL 240399 and CL 240400, do the same for Mach-O.
Linking cmd/compile with external linking,
name old time/op new time/op delta
Asmb2_GC 32.7ms ± 2% 13.5ms ± 6% -58.56% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
Asmb2_GC 16.5MB ± 0% 6.4MB ± 0% -61.15% (p=0.008 n=5+5)
Change-Id: I0fd7019d8713d1940e5fbbce4ee8eebd926451a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/241178
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The loader writeBlock() function has code that tries to skip the
initial portion of the input symbols list depending on the address of
the section being written-- this code is dead (skipping is never
triggered) due to similar skipping in the callers; remove this
preamble.
Change-Id: I9769694a3194faf73ebebbbc10ceba4928c3087c
Reviewed-on: https://go-review.googlesource.com/c/go/+/241067
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The errors on these lines are meant to be discarded.
Add a comment to make that extra clear.
Change-Id: I38f72af6dfbb0e86677087baf47780b3cc6e7d40
Reviewed-on: https://go-review.googlesource.com/c/go/+/241083
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Introduce a new loader method "SetCarrierSym", to be used when
establishing container/containee symbol relationships for symbol
bucketing in the symtab phase.
This new method is intended to be employed in situations where you
have a series of related symbols will be represented by a single
carrier symbol as a combined entity. The pattern here is that the
sub-symbols contain content but will be anonymous from a symbol table
perspective; the carrier symbol has no content itself but will appear
in the symbol table. Examples of carrier symbols that follow this
model are "runtime.itablink" and "runtime.typelink".
Change-Id: I1a3391a71062c7c740cb108b3fa210b7f69b81ed
Reviewed-on: https://go-review.googlesource.com/c/go/+/240509
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Introduce a new loader method "AddInteriorSym" to be used when
establishing container/containee symbol relationships for host object
sub-symbols and GOT/dynamic sub-symbols.
Interior symbols are employed in situations where you have a
"container" or "payload" symbol that has content, and then a series of
"interior" sub-symbols that point into a portion of the container
symbol's content. Each interior symbol will typically have a useful
name / size / value, but no content of its own. From a symbol table
perspective the container symbol is anonymous, but the interior
symbols are added to the output symbol table.
Change-Id: I919ed5dbbfe2ef2c9a76214f7ea9b384a1be6297
Reviewed-on: https://go-review.googlesource.com/c/go/+/240508
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
In CL 240399 we changed to precompute the size for ELF relocation
records and use mmap to write them, but we left architectures
where elfreloc1 write non-fixed number of bytes. This CL handles
those architectures. When a Go relocation will turn into multiple
ELF relocations, in relocsym we account this difference and add
it to the size calculation. So when emitting ELF relocations, we
know the number of ELF relocations to be emitted.
Change-Id: I6732ab674b442f4618405e5412a77f6e4a3315d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/241079
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Now that we write ELF relocation records in mapped memory with
known sizes and offsets, we can write them in parallel.
Further speed up Asmb2 pass. Linking cmd/compile with external
linking,
Asmb2 141ms ± 4% 97ms ± 5% -30.98% (p=0.000 n=10+9)
Change-Id: I52c2b9230e90ed4421c21d7ef13a4f1e996f6054
Reviewed-on: https://go-review.googlesource.com/c/go/+/240400
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, ELF relocations are generated sequentially in the heap
and flushed to output file periodically. In fact, in some cases,
the output size of the relocation records can be easily computed,
as a relocation entry has fixed size. We only need to count the
number of relocation records to compute the size.
Once the size is computed, we can mmap the output with the proper
size, and directly write relocation records in the mapped memory.
It also opens the possibility of writing relocations in parallel
(not done in this CL).
Note: on some architectures, a Go relocation may turn into
multiple ELF relocations, which makes size calculation harder.
This CL does not handle those cases, and it still writes
sequentially in the heap there.
Linking cmd/compile with external linking,
name old time/op new time/op delta
Asmb2 190ms ± 2% 141ms ± 4% -25.74% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
Asmb2_GC 66.8MB ± 0% 8.2MB ± 0% -87.79% (p=0.008 n=5+5)
name old live-B new live-B delta
Asmb2_GC 66.9M ± 0% 55.2M ± 0% -17.58% (p=0.008 n=5+5)
Change-Id: If7056bbe909dc90033eef6b9c4891fcca310602c
Reviewed-on: https://go-review.googlesource.com/c/go/+/240399
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Summary
The crypto/tls/generate_cert.go utility should only set the template
x509.Certificate's KeyUsage field to a value with the
x509.KeyUsageKeyEncipherment bits set when the certificate subject
public key is an RSA public key, not an ECDSA or ED25519 public key.
Background
RFC 5480 describes the usage of ECDSA elliptic curve subject keys with
X.509. Unfortunately while Section 3 "Key Usages Bits" indicates which
key usage bits MAY be used with a certificate that indicates
id-ecPublicKey in the SubjectPublicKeyInfo field it doesn't provide
guidance on which usages should *not* be included (e.g. the
keyEncipherment bit, which is particular to RSA key exchange). The same
problem is present in RFC 8410 Section 5 describing Key Usage Bits for
ED25519 elliptic curve subject keys.
There's an update to RFC 5480 in last call stage within the IETF LAMPS
WG, draft-ietf-lamps-5480-ku-clarifications-00. This update is meant
to clarify the allowed Key Usages extension values for certificates with
ECDSA subject public keys by adding:
> If the keyUsage extension is present in a certificate that indicates
> id-ecPublicKey as algorithm of AlgorithmIdentifier [RFC2986] in
> SubjectPublicKeyInfo, then following values MUST NOT be present:
>
> keyEncipherment; and
> dataEncipherment.
I don't believe there is an update for RFC 8410 in the works but I
suspect it will be clarified similarly in the future.
This commit updates generate_cert.go to ensure when the certificate
public key is ECDSA or ED25519 the generated certificate has the
x509.Certificate.KeyUsage field set to a value that doesn't include KUs
specific to RSA. For ECDSA keys this will adhere to the updated RFC 5480
language.
Fixes#36499
Change-Id: Ib1b0757c039b7fe97fc6d1e826fe6b88856c1964
GitHub-Last-Rev: a8f34fb33d
GitHub-Pull-Request: golang/go#36500
Reviewed-on: https://go-review.googlesource.com/c/go/+/214337
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This reverts https://golang.org/cl/191783.
Reason for revert: Broke too many programs which depended on the previous
behavior, even when it was the opposite of what the documentation said.
We can attempt to fix the original issue again for 1.16, while keeping
those programs in mind.
Fixes#39427.
Change-Id: I7a7f24b2a594c597ef625aeff04fff29aaa88fc6
Reviewed-on: https://go-review.googlesource.com/c/go/+/240657
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
On Linux, the linker uses fallocate to preallocate the output
file storage. The underlying file system may not support
fallocate, causing the test to fail. Skip the test in this case.
On darwin, apparently F_PREALLOCATE allocates from the end of the
allocation instead of the logical end of the file. Adjust the
size calculation.
Fixes#39905.
Change-Id: I01e676737fd2619ebbdba05c7cf7f424ec27de35
Reviewed-on: https://go-review.googlesource.com/c/go/+/240618
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When linking against a Go shared library, when a global variable
in the main module has a type defined in the shared library, the
linker needs to pull the GC data from the shared library to build
the GC program for the global variable. Currently, this fails
silently, as the shared library file is closed too early and the
read failed (with no error check), causing a zero GC map emitted
for the variable, which in turn causes the runtime to treat the
variable as pointerless.
For now, fix this by keeping the file open. In the future we may
want to use mmap to read from the shared library instead.
Also add error checking. And fix a (mostly harmless) mistake in
size caluculation.
Also remove an erroneous condition for ARM64. ARM64 used to have
a special case to get the addend from the relocation on the
gcdata field. That was removed, but the new code accidentally
returned 0 unconditionally. It's no longer necessary to have any
special case, since the addend is now applied directly to the
gcdata field on ARM64, like on all the other platforms.
Fixes#39927.
This is the second attempt of CL 240462. And this reverts
CL 240616.
Change-Id: I01c82422b9f67e872d833336885935bc509bc91b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240621
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The special symbols are linker-created symbols for special
purposes, therefore reachable (otherwise the linker won't create
them). Mark them so, so they get converted to sym.Symbols when we
convert to old symbol representation.
In particular, the failure for building shared library on PPC64
is due to .TOC. symbol not being converted to sym.Symbol, but
referenced in addmoduledata.
Change-Id: Iaf5d145ffa5d15122e86a6e6983514e56dd5d456
Reviewed-on: https://go-review.googlesource.com/c/go/+/240620
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Mention support for the 64-bit RISC-V instruction set (GOARCH=riscv64)
in the "Installing Go from source" document. Also sort the list of
supported instruction sets alphabetically.
Updates #27532
Change-Id: I07a443044a41a803853978dd7f7446de89ecceb5
Reviewed-on: https://go-review.googlesource.com/c/go/+/240377
Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
When linking against a Go shared library, when a global variable
in the main module has a type defined in the shared library, the
linker needs to pull the GC data from the shared library to build
the GC program for the global variable. Currently, this fails
silently, as the shared library file is closed too early and the
read failed (with no error check), causing a zero GC map emitted
for the variable, which in turn causes the runtime to treat the
variable as pointerless.
For now, fix this by keeping the file open. In the future we may
want to use mmap to read from the shared library instead.
Also add error checking. And fix a (mostly harmless) mistake in
size caluculation.
Also remove an erroneous condition for ARM64. ARM64 used to have
a special case to get the addend from the relocation on the
gcdata field. That was removed, but the new code accidentally
returned 0 unconditionally. It's no longer necessary to have any
special case, since the addend is now applied directly to the
gcdata field on ARM64, like on all the other platforms.
Fixes#39927.
Change-Id: Iecd32315b326c7059587fdc190e2fa99426e497e
Reviewed-on: https://go-review.googlesource.com/c/go/+/240462
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
We cannot use "0.0.0.0" (IPv4) or "::" (IPv6) for local address, so
don't use those addresses in the control message. Alternatively, we
could've used "*" instead.
Fixes#39931
Change-Id: Ib2dcbb1a0c648296c3ecaddbe938053a569b1f1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240464
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
The sample code in 'Interfaces and methods' section contains a
data race. Handlers are served concurrently. The handler does write
and read operations; `go test -race` would fail (with concurrent
requests). Since the doc is frozen and the code remains less
cluttered without locks/atomic, don't change the sample code.
Change-Id: I654b324d2f0b7f48497822751907c7d39e2f0e3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/239877
Reviewed-by: Rob Pike <r@golang.org>
This adds an alt tag for accessibility. The alt text is a visual
description of the text that is read out loud to users using a
screen reader. The HTML specifications indicate that alt tags for
decorative images should be left blank.
Fixes#39861
Change-Id: I76c39a461ceabe685826aa46e4f26ad893d50634
Reviewed-on: https://go-review.googlesource.com/c/go/+/240258
Reviewed-by: Alexander Nohe <alex.nohe427@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Make use of the extra parameter on "connect" control message to set the
local IP address and port. The ip(3) man page doesn't document that the
local IP address is settable, but upon inspection of the source code,
it's clearly settable.
Fixes#39747
Change-Id: Ied3d60452f20d6e5af23d1c1dcb34774af0dbd5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240064
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
We were handling loopback devices when attempting to read hardware
address, but packet interfaces were not being handled. As a general fix,
don't attempt to read hardware address of any device that's not inside
/net.
Fixes#39908
Change-Id: Ifa05e270357e111c60906110db2cc23dc7c1c49c
Reviewed-on: https://go-review.googlesource.com/c/go/+/240259
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
This constant does not make it into DWARF because it is an ideal
constant larger than maxint (1<<63-1). DWARF has no way to represent
signed values that large. Define a different typed constant that
is unsigned and so can represent this constant properly.
Viewcore needs this constant to interrogate the heap data structures.
In addition, the sign of arenaBaseOffset changed in 1.15, and providing
a new name lets viewcore detect the sign change easily.
Change-Id: I4274a2f6e79ebbf1411e85d64758fac1672fb96b
Reviewed-on: https://go-review.googlesource.com/c/go/+/240198
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
CL 230037 changed cmd/cgo to emit "type _Ctype_foo = bar" aliases for
all C.foo types mentioned in the original Go source files. However,
cmd/cgo already emits an appropriate type definition for _Ctype_void.
So if a source file explicitly mentions C.void, this resulted in
_Ctype_void being declared multiple times.
This CL fixes the issue by suppressing the "type _Ctype_void =
_Ctype_void" alias before printing it. This should be safe because
_Ctype_void is the only type that's specially emitted in out.go at the
moment.
A somewhat better fix might be to fix how _Ctype_void is declared in
the cmd/cgo "frontend", but this is a less invasive fix.
Fixes#39877.
Change-Id: Ief264b3847c8ef8df1478a6333647ff2cf09b63d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240180
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Also crypto/tls.Config.BuildNameToCertificate.
Note that this field and method were deprecated in the Go 1.14 release,
so this change is to the 1.14 release notes.
Fixes#37626
Change-Id: If8549bc746f42a93f1903439e1b464b3e81e2c19
Reviewed-on: https://go-review.googlesource.com/c/go/+/240005
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Currently, on most platforms, the start/end symbols runtime.text
and runtime.etext are defined in symtab pass and assigned values
in address pass. In some cases (darwin+dynlink or AIX+external),
however, they are defined and assigned values in textaddress pass
(because they need non-zero sizes). Then their values get
overwritten in address pass. This is bad. The linker expects
their values to be consistent. In particular, in CL 239281,
findfunctab is split to two parts. The two parts need to have a
consistent view of the start/end symbols. If its value changes in
between, bad things can happen.
This CL fixes it by always defining runtime.text/etext symbols in
the textaddress pass.
Fix darwin and AIX builds.
Change-Id: Ifdc1bcb69d99be1b7e5b4fd31d473650c03e3b9d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240065
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Create a new class of symbols internal to the linker. These symbols live
in the Loader, and are real smybols, but have no data, only size. After
symbols are allocated in the binary in asmb() a function is called that
is responsible for filling in the data.
This allows the linker to create large symbols, but not pay the price on
the heap memory.
Change-Id: Ib4291fc6e578478057ed2ec163d7b27426f1d5ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/239280
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
It doesn't have to. The type in the aux field is authoritative.
There are cases involving casting from interface{} where pointers
have a placeholder pointer type (because the type is not known when
the IData op is generated).
The check was introduced in CL 13447.
Fixes#39459
Change-Id: Id77a57577806a271aeebd20bea5d92d08ee7aa6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/239817
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
File.Sync was returning *SyscallError instead of *PathError on Plan 9.
Adjust the error type to match other systems.
Fixes#39800
Change-Id: I844e716eb61c193ef78d29cb0b4a3ef790bb3320
Reviewed-on: https://go-review.googlesource.com/c/go/+/239857
Reviewed-by: David du Colombier <0intro@gmail.com>
The Go compiler includes special treatment for a small set of very
commonly used type symbols (26 to be exact); for these types it
doesn't bother to emit type descriptors for "normal" compilations, and
instead only generates them for the runtime package, so as to reduce
object file bloat.
This patch moves the set of type symbols in question from the
PkgIdxNone index space (in the object file) to the PkgIdxBuiltin
space, which saves some work in the compiler and loader (reduces each
package's index space slightly).
Change-Id: I039c805e05c1aef26f035e52760fd0a0af40f7a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/239658
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Change the object file writer to avoid adding entries to the object
file string table for builtin functions. This helps save some very
small amount of space in the object file.
Change-Id: Ic3b94a154e00eb4c7378b57613580c7073b841bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/239657
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
After CL 228645 some mentions of the Deadline methods referred
to the Timeout method, and some to os.ErrDeadlineExceeded.
Stop referring to the Timeout method, to encourage ErrDeadlineExceeded.
For #31449
Change-Id: I27b8ff34f31798f38b06437546886af8cce98ca4
Reviewed-on: https://go-review.googlesource.com/c/go/+/239705
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Switched the generator to using the open source releases of the root
store rather than HTML parsing, while trying to emulate the sorting
algorithm of the table to reduce churn.
Updates #38843
Change-Id: I78608d245eabc2a35c2f98635ed5f1a531ad2ba8
Reviewed-on: https://go-review.googlesource.com/c/go/+/239557
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
On AIX, in relocsym we call Xcoffadddynrel, which adds a
relocation record to a global array. relocsym already runs in
parallel. In the past we only parallelize over segments, and
we call Xcoffadddynrel only for symbols in data segment, so it is
effectively called sequentially. In CL 239197 we started to do
more fine-grained parallelism, so we need to make sure it is safe
to call Xcoffadddynrel in parallel.
Fix AIX build.
Change-Id: I3128193995a5a99d9fa04c8e728e590f17298da3
Reviewed-on: https://go-review.googlesource.com/c/go/+/239561
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The code in the compiler's DWARF line table generation emits line
table ops at the end of each function fragment to reset the state
machine registers back to an initial state, so that when the line
table fragments for each function are stitched together into a
compilation unit, each fragment will have a clean starting point. The
set-file/set-line ops emitted in this code were being applied to the
last row of the line table, however, meaning that they were
overwriting the existing values.
To avoid this problem, add code to advance the PC past the end of the
last instruction in the function, and switch to just using an
end-of-sequence operator at the end of each function instead of
explicit set-file/set-line ops.
Updates #39757.
Change-Id: Ieb30f83444fa86fb1f2cd53862d8cc8972bb8763
Reviewed-on: https://go-review.googlesource.com/c/go/+/239286
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Normally, packages are loaded in dependency order, and if a
Library object is not nil, it is already loaded with the actual
fingerprint. In shared build mode, however, packages may be added
not in dependency order (e.g. go install -buildmode=shared std
adds all std packages before loading them), and it is possible
that a Library's fingerprint is not yet loaded. Skip the check
in this case (when the fingerprint is the zero value).
Fixes#39777.
Change-Id: I66208e92bf687c8778963ba8e33e9bd948f82f3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/239517
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
We can apply relocations of a symbol right after the symbol data
is copied to output buffer. This should help locality and
parallelism (parallelizing over blocks, instead of over segments).
Linking cmd/compile,
Asmb+Reloc 23.9ms ±18% 16.5ms ±11% -30.73% (p=0.008 n=5+5)
Linking cmd/compile with external linking,
Asmb+Reloc 74.0ms ± 3% 33.8ms ± 8% -54.32% (p=0.008 n=5+5)
In external linking mode, allocation goes up slightly, as we do
smaller batching now. It doesn't seem too bad.
Asmb+Reloc 15.0MB ± 0% 16.7MB ± 0% +11.22% (p=0.008 n=5+5)
Change-Id: Ide33d9ff86c39124c8f5cfc050d7badc753a1ced
Reviewed-on: https://go-review.googlesource.com/c/go/+/239197
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Follow glibc's implementation and check secondary group memberships
using Getgroups.
No test since we cannot easily change file permissions when not running
as root and the test is meaningless if running as root.
Same as CL 238722 did for x/sys/unix
Updates #39660
Change-Id: I6af50e27b255e33405558947a0ab3dfbc33b2d50
Reviewed-on: https://go-review.googlesource.com/c/go/+/238937
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The preceding paragraph suggests the test run will produce a file called trace.out.
The same name, trace.out, is used in the output from go help testflag, thus we change the go test line instead of changing the preceding paragraph.
Change-Id: Ib1fa7e49e540853e263a2399b16040ea6f41b703
GitHub-Last-Rev: 3535e62bf8
GitHub-Pull-Request: golang/go#39709
Reviewed-on: https://go-review.googlesource.com/c/go/+/238997
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
In os.Getenv and os.Setenv, instead of directly reading and writing the
Plan 9 environment device (which may be shared with other processes),
use a local copy of environment variables cached at the start of
execution. This gives the same semantics for Getenv and Setenv as on
other operating systems which don't share the environment, making it
more likely that Go programs (for example the build tests) will be
portable to Plan 9.
This doesn't preclude writing non-portable Plan 9 Go programs which make
use of the shared environment semantics (for example to have a command
which exports variable definitions to the parent shell). To do this, use
ioutil.ReadFile("/env/"+key) and
ioutil.WriteFile("/env/"+key, value, 0666)
in place of os.Getenv(key) and os.Setenv(key, value) respectively.
Note that CL 5599054 previously added env cacheing, citing efficiency
as the reason. However it made the cache write-through, with Setenv
changing the shared environment as well as the cache (so not consistent
with Posix semantics), and Clearenv breaking the sharing of the
environment between the calling thread and other threads (leading to
unpredictable behaviour). Because of these inconsistencies (#8849),
CL 158970045 removed the cacheing again.
This CL restores cacheing but without write-through. The local cache is
initialised at start of execution, manipulated by the standard functions
in syscall/env_unix.go to ensure the same semantics, and exported only
when exec'ing a new program.
Fixes#34971Fixes#25234Fixes#19388
Updates #38772
Change-Id: I2dd15516d27414afaf99ea382f0e00be37a570c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/236520
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Fazlul Shahriar <fshahriar@gmail.com>
Reviewed-by: David du Colombier <0intro@gmail.com>
reflect.assignTo writes to the target using write barriers. Make sure
that the memory it is writing to is zeroed, so the write barrier does
not read pointers from uninitialized memory.
Fixes#39541
Change-Id: Ia64b2cacc193bffd0c1396bbce1dfb8182d4905b
Reviewed-on: https://go-review.googlesource.com/c/go/+/238760
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Fixes the *noov opcodes so they handle a constant argument properly.
Most of the infrastructure for this CL is in CL 238077 (the arm32 one).
Fixes#39505
Change-Id: Id424a4e18964b848f05aa42f4d78e5f2e2cdf43b
Reviewed-on: https://go-review.googlesource.com/c/go/+/237999
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Encode the flag results in an auxint field instead of having
one opcode per flag state. This helps us handle the new *noov
branches in a unified manner.
This is only for arm, arm64 is in a subsequent CL.
We could extend to other architectures as well, athough it would
only be cleanup, no behavioral change.
Update #39505
Change-Id: Ia46cea596faad540d1496c5915ab1274571543f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/238077
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This updates the ppc64 asm doc file, including information on
updates to the objdump, correcting information on operand order,
and adding some information on shifts.
Change-Id: Ib8ed53eac86c2121ea5b657c361ad92aae31cb32
Reviewed-on: https://go-review.googlesource.com/c/go/+/238237
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
By keeping a tail pointer, we can append to a patchList in constant
time, rather than in time proportional to the length of the list. This
gets rid of the quadratic compile times we were seeing for long series
of alternations.
This is basically the same change as
e9d517989f.
Fixes#39542.
Change-Id: Ib4ca0ca9c55abd1594df1984653c7d311ccf7572
Reviewed-on: https://go-review.googlesource.com/c/go/+/238079
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Ensure that the exact Request passed to Transport.RoundTrip
is returned in the Response. Do not replace the Request with
a copy when resetting the request body.
Fixes#39533
Change-Id: Ie6fb080c24b0f6625b0761b7aa542af3d2411817
Reviewed-on: https://go-review.googlesource.com/c/go/+/237560
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Currently, for runtime functions and nosplit functions, it is
considered "all unsafe", meaning that the entire function body is
unsafe points. In the past, we didn't mark CALLs in such
functions unsafe, which is fixed in CL 230541. We also didn't
mark block control instructions (for mostly-empty blocks) unsafe.
This CL fixes it.
May fix#36110.
Change-Id: I3be8fdcef2b294e5367b31eb1c1b5e79966565fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/236597
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL 225357 added tests for Scanner not panicking on bad readers.
CL 225557 created a named error value that is returned instead.
CL 237739 documents that the bufio.ErrBadReadCount is returned
when bufio.Scanner is used with an invalid io.Reader.
This suggests we wouldn't want that behavior to be able to change
without a test noticing it, so modify the tests to check for the
exact error value instead of just any non-nil one.
For #38053.
Change-Id: I4b0b8eb6804ebfe2c768505ddb94f0b1017fcf8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/238217
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This patch introduces parallelization of DWARF generation on a per
compilation unit basis. Each compilation unit now operates on a
separate set of symbols, so it's safe to send each compilation unit to
a goroutine to be processed in parallel.
Doing this requires some restructing to ensure that any new symbols
needed are created up front, since we can't create any new syms during
the parallel portion. Similarly, the parallel portion can't set any
symbol attributes, so the check that verifies we haven't doubly listed
any DIE syms had to be reworked, and setting of reachability has to be
delayed until after the parallel phase is complete.
Change-Id: I3042b76e9b597bb1a6a44dce19efba2d02bed76b
Reviewed-on: https://go-review.googlesource.com/c/go/+/237679
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The loader's SymbolBuilder Add*/Set* methods include a call to mark
the underlying symbol as reachable (as a convenience, so that callers
would not have to set it explicitly). This code was carried over from
the corresponding sym.Symbol methods; back in the sym.Symbol world
unreachable symbols were never removed from the AllSyms slice, hence
setting and checking reachability was a good deal more important.
With the advent of the loader and the new deadcode implementation,
there is less of a need for this sort of fallback, and in addition the
implicit attr setting introduces data races in the the loader if there
are SymbolBuilder Add*/Set* method calls in parallel threads, as well
as adding overhead to the methods.
This patch gets rid of the implicit reachability setting, and instead
marks reachability in CreateSymForUpdate, as well as adding a few
explicit SetAttrReachable calls where needed.
Change-Id: I029a0c5a4a24237826a7831f9cbe5180d44cbc40
Reviewed-on: https://go-review.googlesource.com/c/go/+/237678
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Refactor some of the linker's DWARF generation methods so as to have
helper routines that do all the work for a given comp unit for a given
section (range, loc, etc). No change in functionality, this is just a
reorg in preparation for a later patch in this sequence.
Change-Id: I86fc789220326a4e522904a5924c8971d6757189
Reviewed-on: https://go-review.googlesource.com/c/go/+/237677
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Rework the way symbols are handled in DWARF line table generation to
eliminate copying the data payload for all SWDWARFLINES syms (emitted
by the compiler) into the payload of the ".debug_line" section symbol
(generated by the linker). Instead, chain together the SWDWARFLINES
symbols into a list, then append that list to the section sym list in
dwarfp (this moves us from a single monolithic .debug_line to a
.debug_line section sym followed by a list symbols (one per function
and an epilog symbol per compilation unit). To enable this work, move
the emission of the DW_LNE_set_address op (at the start of each
function) from the linker to the compiler.
Change-Id: Iec61b44a451f7a386c82a89bf944de482b018789
Reviewed-on: https://go-review.googlesource.com/c/go/+/237427
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Don't emit the .debug_pubnames/.debug_pubtypes sections. These sections
are not used by either GDB or Delve, and C++ compilers [notably GCC
and Clang] no longer emit the sections by default.
Change-Id: Ic3309755e88c8e1aa28a29366bc7f0df1748fe64
Reviewed-on: https://go-review.googlesource.com/c/go/+/237426
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The linker's asmb phase for ELF has a chunk of code that decides where
to place the .symtab and .strtab sections, which appear after after
the DWARF data; this code currently tries to align the start of the
.symtab section using the value of -R (stored in *FlagRound). This
patch gets rid of this additional alignment and instead just aligns
.symtab by pointer size. The -R value is needed for loadable
segments/sections (such as text or data), not for non-loadable
sections (e.g. symtab). On most architectures the *FlagRound value is
4k, however on ARM64 it is 64k, meaning that aligning symtab on this
boundary can waste a good chunk of space.
Change-Id: Ib51f3ad5611f5614768355eb8533084ba117a8e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/238019
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When a signal is received, the runtime probes whether an
alternate signal stack is set, if so, adjust gsignal's stack to
point to the alternate signal stack. This is done in
adjustSignalStack, which calls sigaltstack "syscall", which is a
libc call on darwin through asmcgocall. asmcgocall decides
whether to do stack switch based on whether we're running on g0
stack, gsignal stack, or regular g stack. If g is not set to
gsignal, asmcgocall may make wrong decision. Set g first.
adjustSignalStack is recursively nosplit, so it is okay that
temporarily gsignal.stack doesn't match the stack we're running
on.
May fix#39079.
Change-Id: I59b2c5dc08c3c951f1098fff038bf2e06d7ca055
Reviewed-on: https://go-review.googlesource.com/c/go/+/238020
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The GCC code repository is now hosted on Git. Adjust the instructions in
gccgo_install.html accordingly.
Change-Id: I443a8b645b63e63785979bc0554521e3dc3b0bf7
Reviewed-on: https://go-review.googlesource.com/c/go/+/237798
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Make sure that if a field comparison might panic, we evaluate
(and short circuit if not equal) all previous fields, and don't
evaluate any subsequent fields.
Add a bunch more tests to the equality+panic checker.
Update #8606
Change-Id: I6a159bbc8da5b2b7ee835c0cd1fc565575b58c46
Reviewed-on: https://go-review.googlesource.com/c/go/+/237919
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This reverts golang.org/cl/190659 and golang.org/cl/226218, minus the
regression tests in the latter.
The original work happened in golang.org/cl/151157, which was reverted
in golang.org/cl/190909 due to a crash found by fuzzing.
We tried a second time in golang.org/cl/190659, which shipped with Go
1.14. A bug was found, where strings would be mangled in certain edge
cases. The fix for that was golang.org/cl/226218, which was backported
into Go 1.14.4.
Unfortunately, a second regression was just reported in #39555, which is
a similar case of strings getting mangled when decoding under certain
conditions. It would be possible to come up with another small patch to
fix that edge case, but instead, let's just revert the entire
optimization, as it has proved to do more harm than good. Moreover, it's
hard to argue or prove that there will be no more such regressions.
However, all the work wasn't for nothing. First, we learned that the way
the decoder unquotes tokenized strings isn't simple; initially, we had
wrongly assumed that each string was unquoted exactly once and in order.
Second, we have gained a number of regression tests which will be useful
to prevent the same mistakes in the future, including the test cases we
add in this CL.
Fixes#39555.
Change-Id: I66a6919c2dd6d9789232482ba6cf3814eaa70f61
Reviewed-on: https://go-review.googlesource.com/c/go/+/237838
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
TestNetpollBreak was sometimes timing out on Plan 9, where
netpoll_stub.go implements only enough of the network poller
to support runtime timers, using a notetsleep / notewakeup
pair. The runtime.lock which serialises the use of the note
doesn't guarantee fairness, and in practice the netpoll call
used by the test can be starved by the netpoll call from the
scheduler which supports the overall 'go test' timeout.
Calling osyield after relinquishing the lock gives the two
callers a more even chance to take a turn, which prevents
the test from timing out.
Fixes#39437
Change-Id: Ifbe6aaf95336d162d9d0b6deba19b8debf17b071
Reviewed-on: https://go-review.googlesource.com/c/go/+/237698
Run-TryBot: David du Colombier <0intro@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The benchmark throughput numbers don't change, but the set-up time (the
time taken before the b.ResetTimer() call) drops from 460ms to 4ms.
Change-Id: I5a6756643dff6127f6d902455d83459c084834fc
Reviewed-on: https://go-review.googlesource.com/c/go/+/237757
Reviewed-by: Rob Pike <r@golang.org>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This alert is triggering occasionally. I've investigated the
collisions that happen, and they all seem to be pairwise, so they are
not a big deal. "pairwise" = when there are 32 collisions, it is two
keys mapping to the same hash, 32 times, not 33 keys all mapping to
the same hash.
Add some t.Logf calls in case this comes back, which will help isolate
the problem.
Fixes#39352
Change-Id: I1749d7c8efd0afcf9024d8964d15bc0f58a86e4f
Reviewed-on: https://go-review.googlesource.com/c/go/+/237718
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Support for linux/386 was added to Delve in version 1.4.1, but the
version of Delve currently installed on the linux-386-longtest
builder is 1.2.0. That isn't new enough, which causes the test
to fail. Skip it on that builder until it can be made to work.
The only reason it used to pass on the linux-386-longtest builder
before is because that builder was misconfigured to run tests for
linux/amd64. This was resolved in CL 234520.
Also improve internal documentation and the text of skip reasons.
Fixes#39309.
Change-Id: I395cb1f076e59dd3a3feb53e1dcdce5101e9a0f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/237603
Reviewed-by: David Chase <drchase@google.com>
Currently, a method of a reachable type is live if it matches a
method of a reachable interface. In fact, we only need to retain
the method if the type is actually converted to an interface. If
the type is never converted to an interface, there is no way to
call the method through an interface method call (but the type
descriptor could still be used, e.g. in calling
runtime.newobject).
A type can be used in an interface in two ways:
- directly converted to interface. (Any interface counts, as it
is possible to convert one interface to another.)
- obtained by reflection from a related type (e.g. obtaining an
interface of T from []T).
For the former, we let the compiler emit a marker on the type
descriptor symbol when it is converted to an interface. In the
linker, we only need to check methods of marked types.
For the latter, when the linker visits a marked type, it needs to
visit all its "child" types as marked (i.e. potentially could be
converted to interface).
This reduces binary size:
cmd/compile 18792016 18706096 (-0.5%)
cmd/go 14120572 13398948 (-5.1%)
Change-Id: I4465c7eeabf575f4dc84017214c610fa05ae31fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/237298
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
We replaced http.DefaultClient with securityPreservingHTTPClient,
but we still need that too many redirects check. This issue introduced
by CL 156838.
We introduce a special path to test rediret requests in the script test
framework. You can specify the number of redirects in the path.
$GOPROXY/redirect/<count>/...
Redirect request sequence details(count=8):
request: $GOPROXY/mod/redirect/8/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/7/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/6/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/5/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/4/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/3/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/2/rsc.io/quote/@v/v1.2.0.mod
redirect: $GOPROXY/mod/redirect/1/rsc.io/quote/@v/v1.2.0.mod
the last: $GOPROXY/mod/rsc.io/quote/@v/v1.2.0.mod
Fixes#39482
Change-Id: I149a3702b2b616069baeef787b2e4b73afc93b0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/237177
Run-TryBot: Baokun Lee <nototon@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This API and functionality was added late in the Go 1.15 release
cycle, and use within gopls has revealed some shortcomings. It's
possible (but not decided) that we'll want a different API long-term,
so for now this CL renames UsesCgo to a non-exported name to avoid
long-term commitment under the Go 1 compat guarantee.
Updates #16623.
Updates #39072.
Change-Id: I04bc0c161a84adebe43e926df5df406bc794c3db
Reviewed-on: https://go-review.googlesource.com/c/go/+/237417
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
The scheduler assumes two special invariants that apply to tuple
selectors (Select0 and Select1 ops):
1. There is only one tuple selector of each type per generator.
2. Tuple selectors and generators reside in the same block.
Prior to this CL the assumption was that these invariants would
only be broken by the CSE pass. The CSE pass therefore contained
code to move and de-duplicate selectors to fix these invariants.
However it is also possible to write relatively basic optimization
rules that cause these invariants to be broken. For example:
(A (Select0 (B))) -> (Select1 (B))
This rule could result in the newly added selector (Select1) being
in a different block to the tuple generator (see issue #38356). It
could also result in duplicate selectors if this rule matches
multiple times for the same tuple generator (see issue #39472).
The CSE pass will 'fix' these invariants. However it will only do
so when optimizations are enabled (since disabling optimizations
disables the CSE pass).
This CL moves the CSE tuple selector fixup code into its own pass
and makes it mandatory even when optimizations are disabled. This
allows tuple selectors to be treated like normal ops for most of
the compilation pipeline until after the new pass has run, at which
point we need to be careful to maintain the invariant again.
Fixes#39472.
Change-Id: Ia3f79e09d9c65ac95f897ce37e967ee1258a080b
Reviewed-on: https://go-review.googlesource.com/c/go/+/237118
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This removes the same logic from run.bat that was removed from
cmd/dist in CL 236819.
The duplicated logic was removed from run.bash and run.rc in CL 6531,
but that part of run.bat was apparently missed (and not noticed
because its effect was redundant).
Also fix a path-separator bug in cmd/addr2line.TestAddr2Line that was
exposed as a result.
Fixes#39478
Updates #39385
Change-Id: I00054966cf92ef92a03681bf23de7f45f46fbb5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/237359
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Restore previously sent SCTs and stapled OCSP response during session
resumption for both TLS 1.2 and 1.3. This behavior is somewhat
complicated for TLS 1.2 as SCTs are sent during the server hello,
so they override what is saved in ClientSessionState. It is likely
that if the server is sending a different set of SCTs there is probably
a reason for doing so, such as a log being retired, or SCT validation
requirements changing, so it makes sense to defer to the server in
that case.
Fixes#39075
Change-Id: I3c0fa2f69c6bf0247a447c48a1b4c733a882a233
Reviewed-on: https://go-review.googlesource.com/c/go/+/234237
Reviewed-by: Filippo Valsorda <filippo@golang.org>
The minor changes to the library section has been populated
with TODOs for individual packages using relnote in CL 235757,
and they've been resolved in the following CLs.
We will look things over as part of finishing touches on
the release notes, but this TODO is resolved for beta 1.
For #37419.
Change-Id: I942f81a957fe8df8f630b4406ca29f73602d080a
Reviewed-on: https://go-review.googlesource.com/c/go/+/237157
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Also do not unset it by default in the tests for cmd/go.
GOROOT_FINAL affects the GOROOT value embedded in binaries,
such as 'cmd/cgo'. If its value changes and a build command
is performed that depends on one of those binaries, the binary
would be spuriously rebuilt.
Instead, only unset it in the specific tests that make assumptions
about the GOROOT paths embedded in specific compiled binaries.
That may cause those tests to do a little extra rebuilding when
GOROOT_FINAL is set, but that little bit of extra rebuilding
seems preferable to spuriously-stale binaries.
Fixes#39385
Change-Id: I7c87b1519bb5bcff64babf1505fd1033ffa4f4fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/236819
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
CL 236857 removed all uses of whitelist/blacklist, which is great.
But it substituted awkward phrasing using allowlist/blocklist,
especially as verbs or participles. This CL uses more standard English,
like "allow the function" or "blocked functions" instead of
"allowlist the function" or "blocklisted functions".
Change-Id: I9106a2fdbd62751c4cbda3a77181358a8a6d0f13
Reviewed-on: https://go-review.googlesource.com/c/go/+/236917
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The removed line assumed that the script's WORK directory is not a
child of any directory containing version-control metadata.
While that assumption does hold in most cases, it does not hold when,
for example, $TMPDIR is $HOME/tmp and $HOME/.git/config exists.
A similar situation may or may not arise when using
golang.org/x/build/cmd/release. Either way, the assertion is incorrect
and was interfering with local testing for #39385.
Updates #39385Fixes#39431
Change-Id: I67813d7ce455aa9b56a6eace6eddebf48d0f7fa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/236818
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
The page sweeper depends on spans being marked if any object in the
span is marked, but currently only greyobject does this.
gcmarknewobject and wbBufFlush1 also mark objects, but neither set
span marks. As a result, if there are live objects on a span, but
they're all marked via allocation or write barriers, then the span
itself won't be marked and the page reclaimer will free the span,
ultimately leading to memory corruption when the memory for those live
allocations gets reused.
Fix this by making gcmarknewobject and wbBufFlush1 also mark pages.
No test because I have no idea how to reliably (or even unreliably)
trigger this.
Fixes#39432.
Performance is a wash or very slightly worse. I benchmarked the
gcmarknewobject and wbBufFlush1 changes independently and both showed
a slight performance improvement, so I'm going to call this noise.
name old time/op new time/op delta
BiogoIgor 15.9s ± 2% 15.9s ± 2% ~ (p=0.758 n=25+25)
BiogoKrishna 15.7s ± 3% 15.7s ± 3% ~ (p=0.382 n=21+21)
BleveIndexBatch100 4.94s ± 3% 5.07s ± 4% +2.63% (p=0.000 n=25+25)
CompileTemplate 204ms ± 1% 205ms ± 1% +0.43% (p=0.000 n=21+23)
CompileUnicode 77.8ms ± 1% 78.1ms ± 1% ~ (p=0.130 n=23+23)
CompileGoTypes 731ms ± 1% 733ms ± 1% +0.30% (p=0.006 n=22+22)
CompileCompiler 3.64s ± 2% 3.65s ± 3% ~ (p=0.179 n=24+25)
CompileSSA 8.44s ± 1% 8.46s ± 1% +0.30% (p=0.003 n=22+23)
CompileFlate 132ms ± 1% 133ms ± 1% ~ (p=0.098 n=22+22)
CompileGoParser 164ms ± 1% 164ms ± 1% +0.37% (p=0.000 n=21+23)
CompileReflect 455ms ± 1% 457ms ± 2% +0.50% (p=0.002 n=20+22)
CompileTar 182ms ± 2% 182ms ± 1% ~ (p=0.382 n=22+22)
CompileXML 245ms ± 3% 245ms ± 1% ~ (p=0.070 n=21+23)
CompileStdCmd 16.5s ± 2% 16.5s ± 3% ~ (p=0.486 n=23+23)
FoglemanFauxGLRenderRotateBoat 12.9s ± 1% 13.0s ± 1% +0.97% (p=0.000 n=21+24)
FoglemanPathTraceRenderGopherIter1 18.6s ± 1% 18.7s ± 0% ~ (p=0.083 n=23+24)
GopherLuaKNucleotide 28.4s ± 1% 29.3s ± 1% +2.84% (p=0.000 n=25+25)
MarkdownRenderXHTML 252ms ± 0% 251ms ± 1% -0.50% (p=0.000 n=23+24)
Tile38WithinCircle100kmRequest 516µs ± 2% 516µs ± 2% ~ (p=0.763 n=24+25)
Tile38IntersectsCircle100kmRequest 689µs ± 2% 689µs ± 2% ~ (p=0.617 n=24+24)
Tile38KNearestLimit100Request 608µs ± 1% 606µs ± 2% -0.35% (p=0.030 n=19+22)
[Geo mean] 522ms 524ms +0.41%
https://perf.golang.org/search?q=upload:20200606.4
Change-Id: I8b331f310dbfaba0468035f207467c8403005bf5
Reviewed-on: https://go-review.googlesource.com/c/go/+/236817
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Previously, if there was a non-directory file with the name vendor or
testdata in the Go source tree, it was possible for some directories
to be skipped by filepath.Walk performed in findGorootModules.
As unusual and unlikely as such non-directory files are, it's better
to ensure all directories are visited, and all modules in the GOROOT
source tree are found.
This increases confidence that tests relying on findGorootModule
will not have unexpected false negatives.
For #36851.
For #36907.
Change-Id: I468e80d8f57119e2c72d546b3fd1e23c31fd6e6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/236600
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This is a followup to CL 96495.
It should be simpler and more robust to achieve .bat files having
CRLF line endings by treating it as a binary file, like all other
files, and checking it in with the desired CRLF line endings.
A test is used to check the entire Go tree, short of directories
starting with "." and named "testdata", for any .bat files that
have anything other than strict CRLF line endings. This will help
catch any accidental modifications to existing .bat files or check
ins of new .bat files.
Importantly, this is compatible with how Gerrit serves .tar.gz files,
making it so that CRLF line endings are preserved.
The Go project is supported on many different environments, some of
which may have limited git implementations available, or none at all.
Relying on fewer git features and special rules makes it easier to
have confidence in the exact content of all files. Additionally, Go
development started in Subversion, moved to Perforce, then Mercurial,
and now uses Git.¹ Reducing its reliance on git-specific features will
help if there will be another transition in the project's future.
There are only 5 .bat files in the entire Go source tree, so a new one
being added is a rare event, and we prefer to do things in Go instead.
We still have the option of improving the experience for developers by
adding a pre-commit converter for .bat files to the git-codereview tool.
¹ https://groups.google.com/d/msg/golang-dev/sckirqOWepg/YmyT7dWJiocJFixes#39391.
For #37791.
Change-Id: I6e202216322872f0307ac96f1b8d3f57cb901e6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/236437
Reviewed-by: Bryan C. Mills <bcmills@google.com>
I had a look at the changes between 1.14 and master, and these are the
only two that seem relevant enough for the changelog.
There was also CL 179337 to reuse values when decoding map elements, but
it got reverted in CL 234559 and is not being included in 1.15.
Updates #37419.
Change-Id: Ib125415a953471ce29553a413d85aaf4b18a7a12
Reviewed-on: https://go-review.googlesource.com/c/go/+/236523
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
There's been plenty of discussion on the usage of these terms in tech.
I'm not trying to have yet another debate. It's clear that there are
people who are hurt by them and who are made to feel unwelcome by their
use due not to technical reasons but to their historical and social
context. That's simply enough reason to replace them.
Anyway, allowlist and blocklist are more self-explanatory than whitelist
and blacklist, so this change has negative cost.
Didn't change vendored, bundled, and minified files. Nearly all changes
are tests or comments, with a couple renames in cmd/link and cmd/oldlink
which are extremely safe. This should be fine to land during the freeze
without even asking for an exception.
Change-Id: I8fc54a3c8f9cc1973b710bbb9558a9e45810b896
Reviewed-on: https://go-review.googlesource.com/c/go/+/236857
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Khosrow Moossavi <khos2ow@gmail.com>
Reviewed-by: Leigh McCulloch <leighmcc@gmail.com>
Reviewed-by: Urban Ishimwe <urbainishimwe@gmail.com>
Use the "Core library -> runtime" section for changes that affect the
runtime package API and use the top-level "Runtime" section for
package-independent behavior changes. Also, move the one change that's
really about os (and net) into the "os" package section and reword it
to be more accurate.
Updates #37419.
Change-Id: I32896b039f29ac67308badd0d0b36e8c6e39f64f
Reviewed-on: https://go-review.googlesource.com/c/go/+/236718
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The TODO was added durring the initial creation of the document.
In the current location, it makes it seem like the tzdata documents
are incomplete when they are complete. It is understood that the
entire Core library section will be a work in progress until the release.
For #37419
Change-Id: Ic857eb0ec2583781c701985ea62e519e9d940090
Reviewed-on: https://go-review.googlesource.com/c/go/+/236760
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Merge conflicts are mostly recently changed nm/objdump output
format and its tests. Resolved easily (mostly just using the
format on master branch).
Change-Id: I99d8410a9a02947ecf027d9cae5762861562baf5
The current contributor documentation is tailored towards contributors
to golang/go, but we have a number of increasingly popular x/ repos.
In this CL, I tried to generalize the language to make it apply to any
repository.
Also, I fixed an old link I noticed in editors.html.
Change-Id: Id9d8e448262ed8c3a67f49be5d554ca29df9d3c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/234899
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This change makes the direct call darwin loadSystemRoots implementation
match the existing cgo implementation, which in turn _mostly_ matches
the Apple implementation. The main change here is that when
SecTrustSettingsCopyTrustSettings the error is ignored, and can either
cause a fallback to check admin trust settings, or cause the
certificate to be marked kSecTrustSettingsResultUnspecified.
As well as updating the implementation to match the cgo one, this
change also updates the documentation of how the fallbacks work and
how they match the Apple implementations. References are made to the
Apple source where appropriate. This change does not update the
existing comments in the cgo implementation, since the goal is to
delete that code once the direct call implementation is matured.
Updates #38888
Change-Id: Id0344ea9d2eede3b715f341e9cbd3c1c661b7a90
Reviewed-on: https://go-review.googlesource.com/c/go/+/233360
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
The ConnectionState's CipherSuite was not set prior
to the VerifyConnection callback in TLS 1.2 servers,
both for full handshakes and resumptions.
Change-Id: Iab91783eff84d1b42ca09c8df08e07861e18da30
Reviewed-on: https://go-review.googlesource.com/c/go/+/236558
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Instead of using container/heap package, implement a simple
specialized heap algorithm for the work queue in the deadcode
pass, to avoid allocations and function pointer calls.
Linking cmd/compile,
name old time/op new time/op delta
Deadcode_GC 59.8ms ± 4% 42.2ms ± 4% -29.45% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
Deadcode_GC 3.53MB ± 0% 2.10MB ± 0% -40.57% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
Deadcode_GC 187k ± 0% 8k ± 0% -95.48% (p=0.008 n=5+5)
Change-Id: Ibb21801d5b8e4a7eaf429856702e02720cd1772f
Reviewed-on: https://go-review.googlesource.com/c/go/+/236565
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, in the deadcode pass, when checking whether a defined
method satisfies an interface, it compares the string
representation of the defined method and the interface method.
In fact, it can simply compare the method name and the type
descriptor (as we do in runtime). Make it so.
Change-Id: Ideb2b2410e5eedcd20ac31e3af41f5499fc90225
Reviewed-on: https://go-review.googlesource.com/c/go/+/236564
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
There's a comment on the Syscall function that's supposed to be an
internal implementation note, but since it's not separated from the
function definition, it appears in godoc. Add a blank line to prevent
this.
Change-Id: Iba307f1cc3844689ec3c6d82c21d441852e35bca
Reviewed-on: https://go-review.googlesource.com/c/go/+/236561
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Now the compiler-generated fingerprint is a hash of the export
data. We don't need to hash it ourselves in the linker. And the
linker doesn't need to read export data at all.
Fixes#33820.
Change-Id: I54bf3ebfd0f0c72aa43a352d7b2e0575dd62970d
Reviewed-on: https://go-review.googlesource.com/c/go/+/236119
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Currently, the compiler generates a fingerprint for each package,
which is used by the linker for index consistency check.
When building plugin or shared object, currently the linker also
generates a hash, by hashing the export data. At run time, when
a package is referenced by multiple DSOs, this hash is compared
to ensure consistency.
It would be good if we can unify this two hashes. This way, the
linker doesn't need to read the export data (which is intended
for the compiler only, and is not always available for the
linker). The export data hash is sufficient for both purposes.
It is consistent with the current hash geneated by the linker.
And the export data includes indices for exported symbols, so its
hash can be used to catch index mismatches.
Updates #33820.
Change-Id: I2bc0d74930746f54c683a10dfd695d50ea3f5a38
Reviewed-on: https://go-review.googlesource.com/c/go/+/236118
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The existing documentation of WriteFile does not make it clear for
non-native English speakers that it will not change the permissions if
the file already exists before.
Fixes#35711
Change-Id: If861c3e3700957fc9ac3d5313351c57d399d3f58
Reviewed-on: https://go-review.googlesource.com/c/go/+/218417
Reviewed-by: Rob Pike <r@golang.org>
Add interfaces which differ in type. Those used so far only
differ in value, not type.
These additional tests are needed to generate a failure
before CL 236278 went in.
Update #8606
Change-Id: Icdb7647b1973c2fff7e5afe2bd8b8c1b384f583e
Reviewed-on: https://go-review.googlesource.com/c/go/+/236418
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
"Fedora" and "Red Hat" are not numbers, it turns out.
Don't rely on version numbers, instead use a regexp to
handle variation across the 2 patterns thus far observed
for gdb-generated Go type names.
Change-Id: I18c81aa2848265a47daf1180d8f6678566ae3f19
Reviewed-on: https://go-review.googlesource.com/c/go/+/236280
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently, for symbols defined in other packages and referenced
by index, we don't record its name in the object file, as the
linker doesn't need the name, only the index. As a consequence,
tools like objdump and nm also don't know the referenced symbol
names and cannot dump it properly.
This CL adds referenced symbol names to the object file. So the
object file is self-contained. And tools can retrieve referenced
symbol names properly.
Tools now should work as good for new object files as for old
object files.
Fixes#38875.
Change-Id: I16c685c1fd83273ab1faef474e19acf4af46396f
Reviewed-on: https://go-review.googlesource.com/c/go/+/236168
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This reverts CL 229246.
For new indexed object files, in CL 229246 we added symbol index
to tools (nm, objdump) output. This affects external tools that
parse those outputs. And the added index doesn't look very nice.
In this release we take it out. For future releases we may
introduce a flag to tools (nm, objdump) and optionally dump the
symbol index.
For refererenced (not defined) indexed symbols, currently the
symbol is still referenced only by index, not by name. The next
CL will make the object file self-contained, so tools can dump
the symbol names properly (as before).
For #38875.
Change-Id: I07375e85a8e826e15c82fa452d11f0eaf8535a00
Reviewed-on: https://go-review.googlesource.com/c/go/+/236167
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Add a blurb to the release notes mentioning that the
linker now supports DWARF generation for -buildmode=plugin,
and that plugin builds work now for freebsd/amd64.
Updates #37419.
Change-Id: I84da7a52af84a9d765f73ca7ea525e7af8d64f05
Reviewed-on: https://go-review.googlesource.com/c/go/+/236162
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Hand-verified for listed gdb versions. Gdb (apparently)
changed the way it names certain Go types, and this change
broke the pretty-printer-activating code in runtime-gdb.py
runtime-gdb_test.go now checks channel, map, string, and slice
printing unconditionally (i.e., no opt-out for old versions).
Updates #39368.
Change-Id: I98d72e1291c66bd40d970990e1a377ff2ed0c5d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/236164
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The current document mismatches Go syntax loads a signed-byte
instruction "MOVB" with GNU syntax loads an 64bit double-word
instruction "ldr". This is just a typo in the document, the
assembler has the correct encoding. This patch fix this error.
Fixes#39367
Change-Id: Idb8f65ca540514ee5bc8f07073e756838710ba93
Reviewed-on: https://go-review.googlesource.com/c/go/+/236217
Reviewed-by: Cherry Zhang <cherryyz@google.com>
During DWARF line table emission in the linker, prior to issuing a
DW_LNE_end_sequence op to mark the end of the line table for a
compilation unit, advance the PC to produce an address beyond the last
text address in the unit (this is required by the DWARF standard).
Because of the way that GDB interprets end-sequence ops, we were
effectively losing the last row in the line table for each unit, which
degraded the debugging experience.
This problem has been around for a while, but has surfaced recently
due to changes in line table generation. Prior to Go 1.14, the DWARF
line table was emitted entirely in the linker, and a single monolithic
line table was created for each Go package (including functions from
assembly). In 1.14 we moved to having the compiler emit line table
fragments for each function, and having the linker stitch together the
fragments. As part of this change we moved to a model in which each
"go tool compile/asm" output has its own DWARF line table instance,
meaning that there are many more "end sequence" ops, which made the
problem more visible.
Fixes#38192.
Change-Id: Ic29e2f6e0ac952360c81fcba5268ad70b2b44184
Reviewed-on: https://go-review.googlesource.com/c/go/+/235739
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Previously we did not steal timers from running P's, because that P
should be responsible for running its own timers. However, if the P
is running a CPU-bound G, this can cause measurable delays in running
ready timers. Also, in CL 214185 we avoided taking the timer lock of a P
with no ready timers, which reduces the chances of timer lock contention.
So, if we can't find any ready timers on sleeping P's, try stealing
them from running P's.
Fixes#38860
Change-Id: I0bf1d5dc56258838bdacccbf89493524e23d7fed
Reviewed-on: https://go-review.googlesource.com/c/go/+/232199
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
The existing documentation for time format constants doesn't mention
that they may parse technically-invalid strings, such as single-digit
hours when a two-digit hour is required by a specification. This commit
adds a short warning note to that effect.
Fixes#37616
Change-Id: I6e5e12bd42dc368f8ca542b4c0527a2b7d30acaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/229460
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
"Something" changed the names of types in gdb, causing the
pretty-printer matchers to fail to match. This tracks that
change.
Updated runtime-gdb_test.go to include a slice and a channel printing test.
(The straightforward printing of a slicevar doesn't work because
of compiler DWARF problems describing the slicevar, not gdb problems).
Change-Id: I21607a955b9c894f11ecf3763aea2a6dd59a3f42
Reviewed-on: https://go-review.googlesource.com/c/go/+/235926
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This change adds a comment to the Verify documentation that indicates
that you can use URI and email style name constraints with a leading
period for DNS names (and explains what they do). This behavior is
not standards compliant, but matches the community application of
RFC 5280, so it makes sense to document it.
Fixes#37535
Change-Id: Ibd6f039e4fa46d40ad7ae1ab48eab86f13cf8eff
Reviewed-on: https://go-review.googlesource.com/c/go/+/233525
Reviewed-by: Ryan Sleevi <sleevi@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
There are data races on fd.[rw]aio and fd.[rw]timedout when Read/Write
is called on a polled fd concurrently with SetDeadline (see #38769).
Adding a mutex around accesses to each pair (read and write) prevents
the race, which was causing deadlocks in net/http tests on the builders.
Updates #38769.
Change-Id: I31719b3c9a664e81a775cda583cff31c0da946c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/235820
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
Call FlushViewOfFile before unmapping the output file, for extra
safety. The documentation says the function does not wait for
the data to be written to disk, so it should be cheap.
Fixes#38440.
Change-Id: I05352f15d9305e6e7086a002f61802f74036b710
Reviewed-on: https://go-review.googlesource.com/c/go/+/235639
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
The version "" denotes the main module, which has no version. The
mvs.Reqs interface documentation hints this is allowed, but it's not
obvious from the implementation in modload.mvsReqs.Max.
Also, replace a related TODO with a comment in mvs.Downgrade.
Fixes#39042
Change-Id: I11e10908c9b3d8c2283eaa5c04bd8e1b936851fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/234003
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
When printing regular test output check the indentation of the output, and use
the report stack to find the appropriate test name for that output.
This change includes a whitespace change to some golden test files. The
indentation of tests was changed in CL 113177
from tabs to spaces. The golden files have been updated to match the new
output format. The tabs in the golden files cause problems because the indentation check
looks for 4 spaces.
Fixes#29755
Updates #25369
Change-Id: Iebab51816a9755168083a7a665b41497e9dfd85f
GitHub-Last-Rev: 898827f1a6
GitHub-Pull-Request: golang/go#34419
Reviewed-on: https://go-review.googlesource.com/c/go/+/196617
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This change fixes a race condition between beforeIdle waking up the
innermost event handler and a timer causing a different goroutine to
wake up at the exact same moment. This messes up the wasm event handling
and leads to memory corruption. The solution is to make beforeIdle
return the goroutine that must run next and have findrunnable pick
this goroutine without considering timers again.
Fixes#38093Fixes#38574
Change-Id: Iffbe99411d25c2730953d1c8b0741fd892f8e540
Reviewed-on: https://go-review.googlesource.com/c/go/+/230178
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When run with stdin == /dev/null and stdout/stderr == pipe (i.e., as
os/exec.Command.CombinedOutput), GDB suffers from a bug
(https://sourceware.org/bugzilla/show_bug.cgi?id=26056) that causes
SIGSEGV when sent a SIGWINCH signal.
Package runtime tests TestEINTR and TestSignalDuringExec both send
SIGWINCH signals to the entire process group, thus including GDB if one
of the GDB tests is running in parallel.
TestEINTR only intends its signals for the current process, so it is
changed to do so. TestSignalDuringExec, really does want its signals to
go to children. However, it does not call t.Parallel(), so it won't run
at the same time as GDB tests.
This is a simple fix, but GDB is vulnerable, so we must be careful not
to add new parallel tests that send SIGWINCH to the entire process
group.
Fixes#39021
Change-Id: I803606fb000f08c65c1b10ec554d4ef6819e5dd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/235557
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
CL 228017 added a new help page 'go help buildconstraint' which
summarized the information on build constraints in the go/build
documentation. The summary was almost as long as the go/build
documentation, since there's very little that can be left out.
This CL moves the original go/build documentation to
'go help buildconstraint' to eliminate redundnancy. The text
describing enabled tags is slightly different (targeting command-line
users more than go/build users), but the rest of the documentation is
unchanged.
Fixes#37018
Change-Id: Ic0ed4c6fdae2395dd58852e1600c701247c9c4cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/232981
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
In module mode, 'go get' prints a message for each version query it
resolves. This change groups those messages together near the end of
the output so they aren't mixed with other module "finding" and
"downloading" messages. They'll still be printed before build-related
messages.
Fixes#37982
Change-Id: I107a9f2b2f839e896399df906e20d6fc77f280c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/232578
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
New test case for issue 38068, which deals with build reproducibility:
do a pair of compilations, the first with the concurrent back end
turned on, and the second with -c=1, then check to make sure we get
the same output (using a test case that triggers late inlining into
wrapper methods).
Updates #38068.
Change-Id: I4afaf78898706a66985f09d18f6f6f29876c9017
Reviewed-on: https://go-review.googlesource.com/c/go/+/234417
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
AddCookie properly encodes a cookie and appends it to the Cookie header
field but does not modify or sanitize what the Cookie header field
contains already. If a user manualy sets the Cookie header field to
something not conforming to RFC 6265 then a cookie added via AddCookie
might not be retrievable.
Fixes#38437
Change-Id: I232b64ac489b39bb962fe4f7dbdc2ae44fcc0514
Reviewed-on: https://go-review.googlesource.com/c/go/+/235141
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
fieldInfo.value used to initialize nil anonymous struct fields if they
were encountered. This behavior is wanted when decoding, but not when
encoding. When encoding, the value should never be modified, and these
nil fields should be skipped entirely.
To fix the bug, add a bool argument to the function which tells the
code whether we are encoding or decoding.
Finally, add a couple of tests to cover the edge cases pointed out in
the original issue.
Fixes#27240.
Change-Id: Ic97ae4bfe5f2062c8518e03d1dec07c3875e18f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/196809
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This reverts golang.org/cl/179337.
Reason for revert: broke a few too many reasonably valid Go programs.
The previous behavior was perhaps less consistent, but the docs were
never very clear about when the decoder merges with existing values,
versus replacing existing values altogether.
Fixes#39149.
Change-Id: I1c1d857709b8398969fe421aa962f6b62f91763a
Reviewed-on: https://go-review.googlesource.com/c/go/+/234559
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Previously, when the target (“old”) path passed to os.Symlink was a
“root-relative” Windows path,¹ we would erroneously prepend
destination (“new”) path when determining which path to Stat,
resulting in an invalid path which was then masked by the lack of
error propagation for the Stat call (#39183).
If the link target is a directory (rather than a file), that would
result in the symlink being created without the
SYMBOLIC_LINK_FLAG_DIRECTORY flag, which then fails in os.Open.
¹https://docs.microsoft.com/en-us/windows/win32/fileio/creating-symbolic-links
Updates #39183
Change-Id: I04f179cd2b0c44f984f34ec330acad2408aa3a20
Reviewed-on: https://go-review.googlesource.com/c/go/+/235317
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When go115ReduceLiveness is true (so we don't emit actual
register maps), use StackMapDontCare consistently for the
register map index, so RegMapValid is always false.
This fixes a compiler crash when doing -live=2 debug print.
Fixes#39251.
Change-Id: Ice087af491fa69c413f8ee59f923b72d592c0643
Reviewed-on: https://go-review.googlesource.com/c/go/+/235418
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
The paths for the other "go" commands in this file were fixed in CL 223741,
but this one was missed (and run.bat is not caught by the builders).
Change-Id: Iba1efddc7d2fbe6af39c39d643508decc954bbc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/234758
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
In certain cases the HTTP/2 stack needs to resend a request.
It obtains a fresh body to send by calling req.GetBody.
This call was missing from the path where the HTTP/2
round tripper returns ErrSkipAltProtocol, meaning fall back
to HTTP/1.1. The result was that the HTTP/1.1 fallback
request was sent with no body at all.
This CL changes that code path to rewind the body before
falling back to HTTP/1.1. But rewinding the body is easier
said than done. Some requests have no GetBody function,
meaning the body can't be rewound. If we need to rewind and
can't, that's an error. But if we didn't read anything, we don't
need to rewind. So we have to track whether we read anything,
with a new ReadCloser wrapper. That in turn requires adding
to the couple places that unwrap Body values to look at the
underlying implementation.
This CL adds the new rewinding code in the main retry loop
as well.
The new rewindBody function also takes care of closing the
old body before abandoning it. That was missing in the old
rewind code.
Thanks to Aleksandr Razumov for CL 210123
and to Jun Chen for CL 234358, both of which informed
this CL.
Fixes#32441.
Change-Id: Id183758526c087c6b179ab73cf3b61ed23a2a46a
Reviewed-on: https://go-review.googlesource.com/c/go/+/234894
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
All GDB tests currently ignore non-zero exit statuses. When tests
flakes, we don't even know if GDB exited successfully or not.
Add checks for non-zero exits, which are not expected.
Furthermore, always log the output from GDB. The tests are currently
inconsistent about whether they always log, or only on error.
Updates #39021
Change-Id: I7af1d795fc2fdf58093cb2731d616d4aa44e9996
Reviewed-on: https://go-review.googlesource.com/c/go/+/235282
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When the output file is mmap'd, OutBuf.Close currently munmap the
file but doesn't actually close the file descriptor. This CL
makes it actually close the FD.
Change-Id: I053c5592ae95497228c50ce6a267b3b48f0af6d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/235417
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
If GOPROXY is "", we set it to the default value,
"https://proxy.golang.org,direct". However, if GOPROXY is a non-empty
string that doesn't contain any URLs or keywords, we treat it as
either "off" or "noproxy", which can lead to some strange errors.
This change reports an error for this kind of GOPROXY value.
For #39180
Change-Id: If2e6e39d6f74c708e5ec8f90e9d4880e0e91894f
Reviewed-on: https://go-review.googlesource.com/c/go/+/234857
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
This fixes a bug in CL 228777 which disallowed
a MaxPathLen of -1 without IsCA, even though the
x509.Certificate documentation indicates that
MaxPathLen of -1 is considered "unset".
Updates #38216
Change-Id: Ib7240e00408d060f27567be8b820d0eee239256f
Reviewed-on: https://go-review.googlesource.com/c/go/+/235280
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Background: when compiling a function, it's possible that a local
variable will be optimized away, which could potentially degrade the
debugging experience if the compiler fails to emit DWARF information
for the variable's type. To mitigate this situation, the compiler
emits R_USETYPE relocations for the function's auto/param variables as
a signal to the linker to generate DWARF for the types in question,
even if the type is not specifically attached to a DWARF param or var.
This patch change the logic in the compiler to avoid emitting a
R_USETYPE relocation if the type in question is already referenced by
a concrete DWARF param or auto record. This cuts down on the amount of
work the linker has to do, also makes object files a bit smaller on
average (about 1% for the runtime package).
Change-Id: I4d24da458d0658edf90c5dca0bf21d5ddc3961d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/234837
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Rework the code in the linker that visits DWARF subprorgam DIEs to
reduce number of symbol name instantiations and name lookups, by
making better use of relocation target symbol types.
Change-Id: Ifb2a4e24874b8c891d7fdf17dd749c3f9139157a
Reviewed-on: https://go-review.googlesource.com/c/go/+/234685
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This change splits the SDWARFINFO symbol type (a generic container of
DWARF content) into separate sub-classes. The new symbol types are
SDWARFCUINFO comp unit DIE, also CU info and CU packagename syms
SDWARFCONST constant DIE
SDWARFFCN subprogram DIE (default and concrete)
SDWARFABSFCN abstract function DIE
SDWARFTYPE type DIE
SDWARFVAR global variable DIE
Advantage of doing this: in the linker there are several places where
we have to iterate over a symbol's relocations to pick out references
to specific classes of DWARF sub-symbols (for example, looking for all
abstract function DIEs referenced by a subprogram DIE, or looking at
all the type DIEs used in a subprogram DIE). By splitting SDWARFINFO
into parts clients can now look only at the relocation target's sym
type as opposed to having to materialize the target sym name, or do a
lookup.
Change-Id: I4e0ee3216d3c8f1a78bec3d296c01e95b3d025b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/234684
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Add two no op instructions following svc on openbsd/arm64 and swi on openbsd/arm.
All except some of the most recent arm64 processors have a speculative execution
flaw that occurs across a syscall boundary, which cannot be mitigated in the
kernel. In order to protect against this leak a speculation barrier needs to be
placed after an svc or swi instruction.
In order to avoid the performance impact of these instructions, the OpenBSD 6.7
kernel returns execution two instructions past the svc or swi call. For now two
hardware no ops are added, which allows syscalls to work with both 6.6 and 6.7.
These should be replaced with real speculation barriers once OpenBSD 6.8 is
released.
Updates #36435
Change-Id: I06153cb0998199242cca8761450e53599c3e7de4
Reviewed-on: https://go-review.googlesource.com/c/go/+/234381
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
CL 235017 is about to change the default Android linker to lld. lld doesn't
support the --compress-debug-sections=zlib-gnu flag, but linkerFlagSupported
doesn't take any alternative linkers specified with -fuse-ld into account.
Updates #38838
Change-Id: I5f7422c06d40dedde2e4b070fc48398e8f822190
Reviewed-on: https://go-review.googlesource.com/c/go/+/235157
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The parallel chatty tests added in CL 229085 fail on the
solaris-amd64-oraclerel builder, because a +NN:NN offset time zone is
used. Allow for the `+` character in the corresponding regex to fix
these tests. Also move the '-' to the end of the character class, so it
is not interpreted as the range 9-T.
Change-Id: Iec9ae82ba45d2490176f274f0dc6812666eae718
Reviewed-on: https://go-review.googlesource.com/c/go/+/234978
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Specifically, this change documents the behavior of Unmarshal when a
SEQUENCE contains trailing elements.
For context Unmarshal treats trailing elements of a SEQUENCE that do not
have matching struct fields as valid, as this is how ASN.1 structures
are typically extended. This can be somewhat confusing as you might
expect those elements to be appended to rest, but rest is really only
for trailing data unrelated to the structure being parsed (i.e. if you
append a second sequence to b, it would be returned in rest).
Fixes#35680
Change-Id: Ia2c68b2f7d8674d09e859b4b7f9aff327da26fa0
Reviewed-on: https://go-review.googlesource.com/c/go/+/233537
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
The existing example is needlessly complex.
You have to know that t.Sub returns a Duration
and also have to mentally subtract the two times
to understand what duration should be printed.
Rewrite to focus on just the Duration.String operation.
Change-Id: I00765b6019c07a6ff03022625b556c2b9ba87c09
Reviewed-on: https://go-review.googlesource.com/c/go/+/234893
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
A zombie slot is a slot that is marked, but isn't allocated. This can
indicate a bug in the GC, or a bad use of unsafe.Pointer. Currently,
the sweeper has best-effort detection for zombie slots: if there are
more marked slots than allocated slots, then there must have been a
zombie slot. However, this is imprecise since it only compares totals
and it reports almost no information that may be helpful to debug the
issue.
Add a precise check that compares the mark and allocation bitmaps and
reports detailed information if it detects a zombie slot.
No appreciable effect on performance as measured by the sweet
benchmarks:
name old time/op new time/op delta
BiogoIgor 15.8s ± 2% 15.8s ± 2% ~ (p=0.421 n=24+25)
BiogoKrishna 15.6s ± 2% 15.8s ± 5% ~ (p=0.082 n=22+23)
BleveIndexBatch100 4.90s ± 3% 4.88s ± 2% ~ (p=0.627 n=25+24)
CompileTemplate 204ms ± 1% 205ms ± 0% +0.22% (p=0.010 n=24+23)
CompileUnicode 77.8ms ± 2% 78.0ms ± 1% ~ (p=0.236 n=25+24)
CompileGoTypes 729ms ± 0% 731ms ± 0% +0.26% (p=0.000 n=24+24)
CompileCompiler 3.52s ± 0% 3.52s ± 1% ~ (p=0.152 n=25+25)
CompileSSA 8.06s ± 1% 8.05s ± 0% ~ (p=0.192 n=25+24)
CompileFlate 132ms ± 1% 132ms ± 1% ~ (p=0.373 n=24+24)
CompileGoParser 163ms ± 1% 164ms ± 1% +0.32% (p=0.003 n=24+25)
CompileReflect 453ms ± 1% 455ms ± 1% +0.39% (p=0.000 n=22+22)
CompileTar 181ms ± 1% 181ms ± 1% +0.20% (p=0.029 n=24+21)
CompileXML 244ms ± 1% 244ms ± 1% ~ (p=0.065 n=24+24)
CompileStdCmd 15.8s ± 2% 15.7s ± 2% ~ (p=0.059 n=23+24)
FoglemanFauxGLRenderRotateBoat 13.4s ±11% 12.8s ± 0% ~ (p=0.377 n=25+24)
FoglemanPathTraceRenderGopherIter1 18.6s ± 0% 18.6s ± 0% ~ (p=0.696 n=23+24)
GopherLuaKNucleotide 28.7s ± 4% 28.6s ± 5% ~ (p=0.700 n=25+25)
MarkdownRenderXHTML 250ms ± 1% 248ms ± 1% -1.01% (p=0.000 n=24+24)
[Geo mean] 1.60s 1.60s -0.11%
(https://perf.golang.org/search?q=upload:20200517.6)
For #38702.
Change-Id: I8af1fefd5fbf7b9cb665b98f9c4b73d1d08eea81
Reviewed-on: https://go-review.googlesource.com/c/go/+/234100
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The go/build package uses the "go" tool from the user's environment,
but its tests should not assume that that tool is in any particular
state, let alone appropriate for running the test.
Instead, explicitly use testenv.GoTool, adding it to $PATH in a
TestMain when necessary.
Fixes#39199Fixes#39198
Change-Id: I56618a55ced473e75dd96eeb3a8f7084e2e64d02
Reviewed-on: https://go-review.googlesource.com/c/go/+/234880
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
When a locked M wants to start a new M, it hands off to the template
thread to actually call clone and start the thread. The template thread
is lazily created the first time a thread is locked (or if cgo is in
use).
stoplockedm will release the P (_Pidle), then call handoffp to give the
P to another M. In the case of a pending STW, one of two things can
happen:
1. handoffp starts an M, which does acquirep followed by schedule, which
will finally enter _Pgcstop.
2. handoffp immediately enters _Pgcstop. This only occurs if the P has
no local work, GC work, and no spinning M is required.
If handoffp starts an M, and must create a new M to do so, then newm
will simply queue the M on newmHandoff for the template thread to do the
clone.
When a stop-the-world is required, stopTheWorldWithSema will start the
stop and then wait for all Ps to enter _Pgcstop. If the template thread
is not fully created because startTemplateThread gets stopped, then
another stoplockedm may queue an M that will never get created, and the
handoff P will never leave _Pidle. Thus stopTheWorldWithSema will wait
forever.
A sequence to trigger this hang when STW occurs can be visualized with
two threads:
T1 T2
------------------------------- -----------------------------
LockOSThread LockOSThread
haveTemplateThread == 0
startTemplateThread
haveTemplateThread = 1
newm haveTemplateThread == 1
preempt -> schedule g.m.lockedExt++
gcstopm -> _Pgcstop g.m.lockedg = ...
park g.lockedm = ...
return
... (any code)
preempt -> schedule
stoplockedm
releasep -> _Pidle
handoffp
startm (first 3 handoffp cases)
newm
g.m.lockedExt != 0
Add to newmHandoff, return
park
Note that the P in T2 is stuck sitting in _Pidle. Since the template
thread isn't running, the new M will not be started complete the
transition to _Pgcstop.
To resolve this, we disable preemption around the assignment of
haveTemplateThread and the creation of the template thread in order to
guarantee that if handTemplateThread is set then the template thread
will eventually exist, in the presence of stops.
Fixes#38931
Change-Id: I50535fbbe2f328f47b18e24d9030136719274191
Reviewed-on: https://go-review.googlesource.com/c/go/+/232978
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In #24929, we decided to stream chatty test output. It looks like,
foo_test.go:138: TestFoo/sub-1: hello from subtest 1
foo_test.go:138: TestFoo/sub-2: hello from subtest 2
In this CL, we refactor the output to be grouped by === CONT lines, preserving
the old test-file-before-log-line behavior:
=== CONT TestFoo/sub-1
foo_test.go:138 hello from subtest 1
=== CONT TestFoo/sub-2
foo_test.go:138 hello from subtest 2
This should remove a layer of verbosity from tests, and make it easier to group
together related lines. It also returns to a more familiar format (the
pre-streaming format), whilst still preserving the streaming feature.
Fixes#38458
Change-Id: Iaef94c580d69cdd541b2ef055aa004f50d72d078
Reviewed-on: https://go-review.googlesource.com/c/go/+/229085
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Currently sysmon is not stopped when the world is stopped, which is
in general a difficult thing to do. The result of this is that when
tracing starts and the value of trace.enabled changes, it's possible
for sysmon to fail to emit an event when it really should. This leads to
traces which the execution trace parser deems inconsistent.
Fix this by putting all of sysmon's work behind a new lock sysmonlock.
StartTrace and StopTrace both acquire this lock after stopping the world
but before performing any work in order to ensure sysmon sees the
required state change in tracing. This change is expected to slow down
StartTrace and StopTrace, but will help ensure consistent traces are
generated.
Updates #29707.
Fixes#38794.
Change-Id: I64c58e7c3fd173cd5281ffc208d6db24ff6c0284
Reviewed-on: https://go-review.googlesource.com/c/go/+/234617
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
On darwin, we preallocate file storage space with fcntl
F_ALLOCATEALL in F_PEOFPOSMODE mode. This is specified as
allocating from the physical end of the file. So the size we give
it should be the increment, instead of the total size.
Fixes#39044.
Change-Id: I10c7ee8d51f237b4a7604233ac7abc6f91dcd602
Reviewed-on: https://go-review.googlesource.com/c/go/+/234481
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
When the concurrent back end is not enabled, it is possible to have a
scenario where: we compile a specific inlinable non-pointer-receiver
method T.M, then at some point later on in the compilation we visit a
type that triggers generation of a pointer-receiver wrapper (*T).M,
which then results in an inline of T.M into (*T).M. This introduces
subtle differences in the DWARF as compared with when the concurrent
back end is enabled (in the concurrent case, by the time we run the
SSA back end on T.M is is marked as being inlined, whereas in the
non-current case it is not marked inlined).
As a fix, at the point where we would normally compile a given
function in the xtop list right away, if the function is a method AND
is inlinable AND hasn't been inlined, then delay its compilation until
compileFunctions (so as to make sure that when we do compile it, all
possible inlining has been complete). In addition, make sure that
the abstract function symbol for the inlined function gets recorded
correctly.
Fixes#38068.
Change-Id: I57410ab5658bd4ee5b4b80750518e9b20fd6ba52
Reviewed-on: https://go-review.googlesource.com/c/go/+/234178
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
modfetch.TryProxies ranks errors returned by GOPROXY entries by
usefulness. It returns the error of the highest rank from the last
proxy. Errors from "direct" and "noproxy" are most useful, followed by
errors other than ErrNotExist, followed by ErrNotExist.
This change ranks errUseProxy with ErrNotExist even though it's
reported by "noproxy". There is almost always a more useful message
than "path does not match GOPRIVATE/GONOPROXY".
Fixes#39180
Change-Id: Ifa5b96462d7bf411e6d2d951888465c839d42471
Reviewed-on: https://go-review.googlesource.com/c/go/+/234687
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When copying a stack, we
1. allocate a new stack,
2. adjust pointers pointing to the old stack to pointing to the
new stack.
If the GC is running on another thread concurrently, on a machine
with weak memory model, the GC could observe the adjusted pointer
(e.g. through gp._defer which could be a special heap-to-stack
pointer), but not observe the publish of the new stack span. In
this case, the GC will see the adjusted pointer pointing to an
unallocated span, and throw. Fixing this by adding a publication
barrier between the allocation of the span and adjusting pointers.
One testcase for this is TestDeferHeapAndStack in long mode. It
fails reliably on linux-mips64le-mengzhuo builder without the fix,
and passes reliably after the fix.
Fixes#35541.
Change-Id: I82b09b824fdf14be7336a9ee853f56dec1b13b90
Reviewed-on: https://go-review.googlesource.com/c/go/+/234478
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
On Windows, calling syscall.Open(file, O_CREAT|O_TRUNC, 0) for a file
that already exists would change the file to be read-only.
That is not how the Unix syscall.Open behaves, so avoid it on
Windows by calling CreateFile twice if necessary.
Fixes#38225
Change-Id: I70097fca8863df427cc8a97b9376a9ffc69c6318
Reviewed-on: https://go-review.googlesource.com/c/go/+/234534
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This removes the GOAMD64 environment variable and its documentation.
The value is instead supplied by a compiled-in constant.
Note that function alignment is also dependent on the value of
the (removed) flag; it is 32 for aligned jumps, 16 if not.
When the flag-dependent logic is removed, it will be 32.
Updates #35881.
Change-Id: Ic41c0b9833d2e8a31fa3ce8067d92aa2f165bf72
Reviewed-on: https://go-review.googlesource.com/c/go/+/231600
Reviewed-by: Austin Clements <austin@google.com>
This will hopefully address the occasional "runtime: out of memory"
failures observed on the openbsd-arm-jsing builder:
https://build.golang.org/log/c296d866e5d99ba401b18c1a2ff3e4d480e5238c
Also make the "spin" and "winch" loops concurrent instead of
sequential to cut down the test's running time.
Finally, change Block to coordinate by closing stdin instead of
sending SIGINT. The SIGINT handler wasn't necessarily registered by
the time the signal was sent.
Updates #20400
Updates #39043
Change-Id: Ie12fc75b87e33847dc25a12edb4126db27492da6
Reviewed-on: https://go-review.googlesource.com/c/go/+/234538
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently in (*addrRanges).removeGreaterEqual we use
(addrRange).subtract with a range from specified address to "infinity"
which is supposed to be maxOffAddr. However, maxOffAddr is necessarily
an inclusive bound on the address space, because on many platforms an
exclusive bound would overflow back to 0.
On some platforms like mips and mipsle, the address space is smaller
than what's representable in a pointer, so if there's a range which hits
the top of the address space (such as in the pageAlloc tests), the limit
doesn't overflow, but maxOffAddr is inclusive, so any attempt to prune
this range with (*addrRange).removeGreaterEqual causes a failure, since
the range passed to subtract is contained within the address range which
touches the top of the address space.
Another problem with using subtract here is that addr and
maxOffAddr.addr() may not be in the same segment which could cause
makeAddrRange to panic. While this unlikely to happen, on some platforms
such as Solaris it is possible.
Fix these issues by not using subtract at all. Create a specific
implementation of (addrRange).removeGreaterEqual which side-steps all of
this by not having to worry about the top of the address space at all.
Fixes#39128.
Change-Id: Icd5b587b1a3d32a5681fb76cec4c001401f5756f
Reviewed-on: https://go-review.googlesource.com/c/go/+/234457
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
In CL 231958, TempDir was changed to create a new temp directory on
each allocation, on the theory that it is easy to save in a variable
for callers that want the same directory repeatedly. Apply that
transformation here.
Updates #38850
Change-Id: Ibb014095426c33038e0a2c95303579cf95d5c3ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/234582
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
We use a single parent directory for all temporary directories
created by a test so they're all kept together.
Fixes#38850
Change-Id: If8edae10c5136efcbcf6fd632487d198b9e3a868
Reviewed-on: https://go-review.googlesource.com/c/go/+/231958
Reviewed-by: Russ Cox <rsc@golang.org>
Fold the descriptions of testing.T.Deadline and TestMain related changes
into the existing section for package testing.
Also link T.Deadline to its godoc.
Change-Id: I732c45fb879305099cb8a51a77ef11fba1b2f1e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/234557
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Most Go objects are compiled with known package path, so the
symbol name is already fully expanded. Nevertheless, currently
in the linker strings.Replace is called unconditionally, and most
of the time it doesn't do anything.
This CL records a per-object flag in the object file, and do the
name expansion only when the name is not expanded at compile time.
This gives small speedups for the linker. Linking cmd/compile:
name old time/op new time/op delta
Loadlib 35.1ms ± 2% 32.8ms ± 4% -6.43% (p=0.008 n=5+5)
Symtab 15.8ms ± 2% 14.0ms ± 8% -11.45% (p=0.008 n=5+5)
TotalTime 399ms ± 1% 385ms ± 2% -3.63% (p=0.008 n=5+5)
Change-Id: I735084971a051cd9be4284ad294c284cd5b545f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/234490
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This was causing issues when fuzzing with
TestMarshalUnmarshal since the test would
occassionally set the version to VersionTLS13,
which would fail when unmarshaling. The check
doesn't add much in practice, and there is no
harm in removing it to de-flake the test.
Fixes#38902
Change-Id: I0906c570e9ed69c85fdd2c15f1b52f9e372c62e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/234486
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
v0.3.0 is a tag on 859b3ef565e2, the version that was already being
used. This change is a no-op, except for letting us use a release
version instead of a pseudo-version.
For #36905
Change-Id: I70b8ce2a3f1451f5602c469501362d7a6a673b12
Reviewed-on: https://go-review.googlesource.com/c/go/+/234002
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
The Plan 9 runtime startup was enabling notes (like Unix signals)
before the gsignal stack was allocated. This left a small window
of time where an interrupt (eg by the parent killing a subprocess
quickly after exec) would cause a null pointer dereference in
sigtramp. This would leave the interrupted process suspended in
'broken' state instead of exiting. We've observed this on the
builders, where it can make a test time out waiting for the broken
process to terminate.
Updates #38772
Change-Id: I54584069fd3109595f06c78724c1f6419e028aab
Reviewed-on: https://go-review.googlesource.com/c/go/+/234397
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
The runtime needs to find the PC of the deferreturn call in a few
places. So for functions that have defer, we record the PC of
deferreturn call in its funcdata.
For very large binaries, the deferreturn call could be made
through a trampoline. The current code of finding deferreturn PC
fails in this case. This CL handles the trampoline as well.
Fixes#39049.
Change-Id: I929be54d6ae436f5294013793217dc2a35f080d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/234105
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This deletes all sym.Symbol and sym.Reloc references. This is
certainly not complete, and there are more cleanups to do. But I
feel this makes a good first round.
Change-Id: I7621d016957f7ef114be5f0606fcb3ad6aee71c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/234097
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently, for the special field tracking symbol go.track.XXX,
when they are reachable, we set its type to SCONST. There is no
need to do that. Just leave it unset (as Sxxx). The symbol is
done after this point.
Change-Id: I966d80775008f7fb5d30fbc6b9e4a30ae8316b6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/233998
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Don't include SCONST symbols in the symbol table when
NotInSymbolTable is set. This is what the old code (genasmsym)
does.
In fact, SCONST symbol is only emitted by the field tracking
code, and is always NotInSymbolTable. So we should just not
include them at all, or not generate SCONST symbols at all. But
at this late stage I'll just restore the old behavior.
Change-Id: If6843003e16701d45b8c67b2297098a7babdec52
Reviewed-on: https://go-review.googlesource.com/c/go/+/233997
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently maxOffAddr is defined in terms of the whole 64-bit address
space, assuming that it's all supported, by using ^uintptr(0) as the
maximal address in the offset space. In reality, the maximal address in
the offset space is (1<<heapAddrBits)-1 because we don't have more than
that actually available to us on a given platform.
On most platforms this is fine, because arenaBaseOffset is just
connecting two segments of address space, but on AIX we use it as an
actual offset for the starting address of the available address space,
which is limited. This means using ^uintptr(0) as the maximal address in
the offset address space causes wrap-around, especially when we just
want to represent a range approximately like [addr, infinity), which
today we do by using maxOffAddr.
To fix this, we define maxOffAddr more appropriately, in terms of
(1<<heapAddrBits)-1.
This change also redefines arenaBaseOffset to not be the negation of the
virtual address corresponding to address zero in the virtual address
space, but instead directly as the virtual address corresponding to
zero. This matches the existing documentation more closely and makes the
logic around arenaBaseOffset decidedly simpler, especially when trying
to reason about its use on AIX.
Fixes#38966.
Change-Id: I1336e5036a39de846f64cc2d253e8536dee57611
Reviewed-on: https://go-review.googlesource.com/c/go/+/233497
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
When tuple generators and selectors are eliminated as part of the
CSE pass we may end up with tuple selectors that are in different
blocks to the tuple generators that they correspond to. This breaks
the invariant that tuple generators and their corresponding
selectors must be in the same block. Therefore after CSE this
situation must be corrected.
Unfortunately the fixup code did not take into account that selectors
could be eliminated by CSE. It assumed that only the tuple generators
could be eliminated. In some situations this meant that it got into
a state where it was replacing references to selectors with references
to dead selectors in the wrong block.
To fix this we move the fixup code after the CSE rewrites have been
applied. This removes any difficult-to-reason-about interactions
with the CSE rewriter.
Fixes#38916.
Change-Id: I2211982dcdba399d03299f0a819945b3eb93b291
Reviewed-on: https://go-review.googlesource.com/c/go/+/233857
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
- Avoid starting subprocesses when the test is already very close to
timing out. The overhead of starting and stopping processes may
cause the test to exceed its deadline even if each individual
process is signaled soon after it is started.
- If a command does not shut down quickly enough after receiving
os.Interrupt, send it os.Kill using the same style of grace period
as in CL 228438.
- Fail the test if a background command whose exit status is not
ignored is left running at the end of the test. We have no reliable
way to distinguish a failure due to the termination signal from an
unexpected failure, and the termination signal varies across
platforms (so may cause failure on one platform but success on
another).
For #38797
Change-Id: I767898cf551dca45579bf01a9d1bb312e12d6193
Reviewed-on: https://go-review.googlesource.com/c/go/+/233526
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Use uint32 consistently for local index (this is what the object
file uses).
Use a index, instead of a pointer, to refer to the object file.
This reduces memory usage and GC work.
This reduces some allocations. Linking cmd/compile,
name old alloc/op new alloc/op delta
Loadlib_GC 19.9MB ± 0% 16.9MB ± 0% -15.33% (p=0.008 n=5+5)
name old live-B new live-B delta
Loadlib_GC 12.6M ± 0% 11.3M ± 0% -9.97% (p=0.008 n=5+5)
Change-Id: I20ce60bbb6d31abd2e9e932bdf959e2ae840ab98
Reviewed-on: https://go-review.googlesource.com/c/go/+/233779
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
While reviewing CL 228784, I noticed that various filepath.WalkFunc
implementations within cmd/go were dropping non-nil errors.
Those errors turn out to be significant, at least in some cases: for
example, they can cause packages to appear to be missing when any
parent of the directory had the wrong permissions set.
(This also turned up a bug in the existing list_dedup_packages test,
which was accidentally passing a nonexistent directory instead of the
intended duplicate path.)
Change-Id: Ia09a0a33aa7a966d9f132d3747d6c674a5370b2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/232579
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
- Don't assume that a process interrupted at 100μs intervals will have
enough remaining time to make progress. (Stop sending signals
in between signal storms to allow the process to quiesce.)
- Don't assume that a child process that spins for 1ms will block long
enough for the parent process to receive signals or make meaningful
progress. (Instead, have the child block indefinitely, and unblock
it explicitly after the signal storm.)
For #39043
Updates #22838
Updates #20400
Change-Id: I85cba23498c346a637e6cfe8684ca0c478562a93
Reviewed-on: https://go-review.googlesource.com/c/go/+/233877
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Remove the loader's PropagateSymbolChangesBackToLoader and
PropagateLoaderChangesToSymbols shim functions. These were used at one
point to enable conversion of phases in the linker that were
"downstream" of loadlibfull -- given the current wavefront position
there's not much point keeping them around.
Change-Id: I3f01f25b70b1b80240369c8f3a10dca89931610f
Reviewed-on: https://go-review.googlesource.com/c/go/+/233817
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Minor renaming cleanup to get rid of a couple of old sym.Symbol
adddynrel helpers and rename the current crop of adddynrel2
methods/functions back to adddynrel.
Change-Id: I67e76decff84d603ef765f3b6a0cd78c7f3743ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/233523
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Adds in support for remaining architectures to the linker's ELF asmb2
path, along with deleting most of the older sym.Symbol based code.
Change-Id: I67c96525db72b7d6dd3187cf2b9f6faddc296291
Reviewed-on: https://go-review.googlesource.com/c/go/+/233362
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This patch converts the linker's Asmb2 phase to use loader APIs
for AMD64 (other architectures to be converted in a subsequent
patch).
Change-Id: I5a9aa9b03769cabc1a22b982f48fd113213d7bcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/233338
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Historically we've assumed that we can install all signal handlers
with the SA_RESTART flag set, and let the system restart slow functions
if a signal is received. Therefore, we don't have to worry about EINTR.
This is only partially true, and we've added EINTR checks already for
connect, and open/read on Darwin, and sendfile on Solaris.
Other cases have turned up in #36644, #38033, and #38836.
Also, #20400 points out that when Go code is included in a C program,
the C program may install its own signal handlers without SA_RESTART.
In that case, Go code will see EINTR no matter what it does.
So, go ahead and check for EINTR. We don't check in the syscall package;
people using syscalls directly may want to check for EINTR themselves.
But we do check for EINTR in the higher level APIs in os and net,
and retry the system call if we see it.
This change looks safe, but of course we may be missing some cases
where we need to check for EINTR. As such cases turn up, we can add
tests to runtime/testdata/testprogcgo/eintr.go, and fix the code.
If there are any such cases, their handling after this change will be
no worse than it is today.
For #22838Fixes#20400Fixes#36644Fixes#38033Fixes#38836
Change-Id: I7e46ca8cafed0429c7a2386cc9edc9d9d47a6896
Reviewed-on: https://go-review.googlesource.com/c/go/+/232862
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Taking over Zach's CL 212277. Just cleaned up and added a test.
For a positive, signed integer, an arithmetic right shift of count
(bit-width - 1) equals zero. e.g. int64(22) >> 63 -> 0. This CL makes
prove replace these right shifts with a zero-valued constant.
These shifts may arise in source code explicitly, but can also be
created by the generic rewrite of signed division by a power of 2.
// Signed divide by power of 2.
// n / c = n >> log(c) if n >= 0
// = (n+c-1) >> log(c) if n < 0
// We conditionally add c-1 by adding n>>63>>(64-log(c))
(first shift signed, second shift unsigned).
(Div64 <t> n (Const64 [c])) && isPowerOfTwo(c) ->
(Rsh64x64
(Add64 <t> n (Rsh64Ux64 <t>
(Rsh64x64 <t> n (Const64 <typ.UInt64> [63]))
(Const64 <typ.UInt64> [64-log2(c)])))
(Const64 <typ.UInt64> [log2(c)]))
If n is known to be positive, this rewrite includes an extra Add and 2
extra Rsh. This CL will allow prove to replace one of the extra Rsh with
a 0. That replacement then allows lateopt to remove all the unneccesary
fixups from the generic rewrite.
There is a rewrite rule to handle this case directly:
(Div64 n (Const64 [c])) && isNonNegative(n) && isPowerOfTwo(c) ->
(Rsh64Ux64 n (Const64 <typ.UInt64> [log2(c)]))
But this implementation of isNonNegative really only handles constants
and a few special operations like len/cap. The division could be
handled if the factsTable version of isNonNegative were available.
Unfortunately, the first opt pass happens before prove even has a
chance to deduce the numerator is non-negative, so the generic rewrite
has already fired and created the extra Ops discussed above.
Fixes#36159
By Printf count, this zeroes 137 right shifts when building std and cmd.
Change-Id: Iab486910ac9d7cfb86ace2835456002732b384a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/232857
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
... and 0-31 for 32-bit shifts.
Generally update the docs for ppc64 shift instructions to be
clearer about what they actually do.
This issue is causing problems for the subsequent CL. The shift
amount was <0 and caused the assembler to report an invalid instruction.
Change-Id: I8c708a15e7f71931835e6e543d8db3c716186e52
Reviewed-on: https://go-review.googlesource.com/c/go/+/232858
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Old url 404s because the file no longer exists on master; change it to
point to the android 10 release branch.
Change-Id: If0f8b645f2c746f9fc8bbd68f4d1fe41868493ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/232809
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Only enable broadcast on SOCK_DGRAM and SOCK_RAW sockets, SOCK_STREAM
and others don't support it.
Don't enable SO_BROADCAST on UNIX domain sockets as they don't support it.
This caused failures on WSL which strictly checks setsockopt calls
unlike other OSes which often silently ignore bad options.
Also return error for setsockopt call for SO_BROADCAST on Windows
matching all other platforms but for IPv4 only as it's not supported
on IPv6 as per:
https://docs.microsoft.com/en-us/windows/win32/winsock/socket-optionsFixes#38954
Change-Id: I0503fd1ce96102b17121af548b66b3e9c2bb80d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/232807
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Before this commit, the code declares and assigns "n" with the result of
io.ReadFull() -- but the value is not used. The variable is then reused
later in the function.
This commit removes the first declaration of "n" and declares it closer
to where it is used.
Change-Id: I7ffe19a10f2a563c306bb6fe6562493435b9dc5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/232917
Reviewed-by: Rob Pike <r@golang.org>
testing.M.Run has this bit of code:
if !flag.Parsed() {
flag.Parse()
}
It makes sense, and it's common knowledge for many Go developers that
test flags are automatically parsed by the time tests and benchmarks are
run. However, the docs didn't clarify that. The previous wording only
mentioned that flag.Parse isn't run before TestMain, which doesn't
necessarily mean that it's run afterwards.
Fixes#38952.
Change-Id: I85f7a9dce637a23c5cb9abc485d47415c1a1ca27
Reviewed-on: https://go-review.googlesource.com/c/go/+/232806
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When we decode into a struct, each input key-value may be decoded into
one of the struct's fields. Particularly, existing data isn't dropped,
so that some sub-fields can be decoded into without zeroing all other
data.
However, decoding into a map behaved in the opposite way. Whenever a
key-value was decoded, it completely replaced the previous map element.
If the map contained any non-zero data in that key, it's dropped.
Instead, try to reuse the existing element value if possible. If the map
element type is a pointer, and the value is non-nil, we can decode
directly into it. If it's not a pointer, make a copy and decode into
that copy, as map element values aren't addressable.
This means we have to parse and convert the map element key before the
value, to be able to obtain the existing element value. This is fine,
though. Moreover, reporting errors on the key before the value follows
the input order more closely.
Finally, add a test to explore the four combinations, involving pointer
and non-pointer, and non-zero and zero values. A table-driven test
wasn't used, as each case required different checks, such as checking
that the non-nil pointer case doesn't end up with a different pointer.
Fixes#31924.
Change-Id: I5ca40c9963a98aaf92f26f0b35843c021028dfca
Reviewed-on: https://go-review.googlesource.com/c/go/+/179337
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The BITCON test, isbitcon, assumes 32-bit constants are expanded
repeatedly, i.e. by copying the low 32 bits to high 32 bits,
instead of zero extending. We already do such expansion in
progedit. In con32class when classifying 32-bit constants, we
should use the expanded constant, instead of zero-extending it.
TODO: we could have better encoding for things like ANDW $-1, Rx.
Fixes#38946.
Change-Id: I37d0c95d744834419db5c897fd1f6c187595c926
Reviewed-on: https://go-review.googlesource.com/c/go/+/232984
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Improve the error user experience when users try to set/refer
to unexported fields and methods of struct literals, by directly saying
"cannot refer to unexported field or method"
Fixes#31053
Change-Id: I6fd3caf64b7ca9f9d8ea60b7756875e340792d59
Reviewed-on: https://go-review.googlesource.com/c/go/+/201657
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The recently added function parseFloatPrefix tested the entire
string for correct placement of separators rather than just the
consumed part. The 4-char fix is in readFloat (atof.go:303).
Added more tests. Also added some white space for nicer
grouping of the test cases.
While at it, removed the need for calling testing.Run.
Fixes#38962.
Change-Id: Ifce84f362bb4ede559103f8d535556d3de9325f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/233017
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Omits printing the file:line:column when trying to
open non-existent files
Given:
go tool compile x.go
* Before:
x.go:0: open x.go: no such file or directory
* After:
open x.go: no such file or directory
Reverts the revert in CL 231043 by only fixing the case
of non-existent errors which is what the original bug
was about. The fix for "permission errors" will come later
on when I have bandwidth to investigate the differences
between running with root and why os.Open works for some
builders and not others.
Fixes#36437
Change-Id: I9c8a0981ad708b504bb43990a4105b42266fa41f
Reviewed-on: https://go-review.googlesource.com/c/go/+/230941
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Fix TestFreeBSDNumCPU on newer versions of FreeBSD which have multi line
output from cpuset e.g.
cpuset -g -p 4141
pid 4141 mask: 0, 1, 2, 3, 4, 5, 6, 7, 8
pid 4141 domain policy: first-touch mask: 0, 1
The test now uses just the first line of output.
Fixes#38937Fixes#25924
Change-Id: If082ee6b82120ebde4dc437e58343b3dad69c65f
Reviewed-on: https://go-review.googlesource.com/c/go/+/232801
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The added comment contains some context. The original optimization
assumed that each call to unquoteBytes (or unquote) followed its
corresponding call to rescanLiteral. Otherwise, unquoting a literal
might use d.safeUnquote from another re-scanned literal.
Unfortunately, this assumption is wrong. When decoding {"foo": "bar"}
into a map[T]string where T implements TextUnmarshaler, the sequence of
calls would be as follows:
1) rescanLiteral "foo"
2) unquoteBytes "foo"
3) rescanLiteral "bar"
4) unquoteBytes "foo" (for UnmarshalText)
5) unquoteBytes "bar"
Note that the call to UnmarshalText happens in literalStore, which
repeats the work to unquote the input string literal. But, since that
happens after we've re-scanned "bar", we're using the wrong safeUnquote
field value.
In the added test case, the second string had a non-zero number of safe
bytes, and the first string had none since it was all non-ASCII. Thus,
"safely" unquoting a number of the first string's bytes could cut a rune
in half, and thus mangle the runes.
A rather simple fix, without a full revert, is to only allow one use of
safeUnquote per call to unquoteBytes. Each call to rescanLiteral when
we have a string is soon followed by a call to unquoteBytes, so it's no
longer possible for us to use the wrong index.
Also add a test case from #38126, which is the same underlying bug, but
affecting the ",string" option.
Before the fix, the test would fail, just like in the original two issues:
--- FAIL: TestUnmarshalRescanLiteralMangledUnquote (0.00s)
decode_test.go:2443: Key "开源" does not exist in map: map[开���:12345开源]
decode_test.go:2458: Unmarshal unexpected error: json: invalid use of ,string struct tag, trying to unmarshal "\"aaa\tbbb\"" into string
Fixes#38105.
For #38126.
Change-Id: I761e54924e9a971a4f9eaa70bbf72014bb1476e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/226218
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
This change uses the new offAddr type in more parts of the runtime where
we've been implicitly switching from the default address space to a
contiguous view. The purpose of offAddr is to represent addresses in the
contiguous view of the address space, and to make direct computations
between real addresses and offset addresses impossible. This change thus
improves readability in the runtime.
Updates #35788.
Change-Id: I4e1c5fed3ed68aa12f49a42b82eb3f46aba82fc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/230718
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Currently addrRange and addrRanges operate on real addresses. That is,
the addresses they manipulate don't include arenaBaseOffset. When added
to an address, arenaBaseOffset makes the address space appear contiguous
on platforms where the address space is segmented. While this is
generally OK because even those platforms which have a segmented address
space usually don't give addresses in a different segment, today it
causes a mismatch between the scavenger and the rest of the page
allocator. The scavenger scavenges from the highest addresses first, but
only via real address, whereas the page allocator allocates memory in
offset address order.
So this change makes addrRange and addrRanges, i.e. what the scavenger
operates on, use offset addresses. However, lots of the page allocator
relies on an addrRange containing real addresses.
To make this transition less error-prone, this change introduces a new
type, offAddr, whose purpose is to make offset addresses a distinct
type, so any attempt to trivially mix real and offset addresses will
trigger a compilation error.
This change doesn't attempt to use offAddr in all of the runtime; a
follow-up change will look for and catch remaining uses of an offset
address which doesn't use the type.
Updates #35788.
Change-Id: I991d891ac8ace8339ca180daafdf6b261a4d43d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/230717
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Currently the scavenger will reset to the top of the heap every GC. This
means if it scavenges a bunch of memory which doesn't get used again,
it's going to keep re-scanning that memory on subsequent cycles. This
problem is especially bad when it comes to heap spikes: suppose an
application's heap spikes to 2x its steady-state size. The scavenger
will run over the top half of that heap even if the heap shrinks, for
the rest of the application's lifetime.
To fix this, we maintain two numbers: a "free" high watermark, which
represents the highest address freed to the page allocator in that
cycle, and a "scavenged" low watermark, which represents how low of an
address the scavenger got to when scavenging. If the "free" watermark
exceeds the "scavenged" watermark, then we pick the "free" watermark as
the new "top of the heap" for the scavenger when starting the next
scavenger cycle. Otherwise, we have the scavenger pick up where it left
off.
With this mechanism, we only ever re-scan scavenged memory if a random
page gets freed very high up in the heap address space while most of the
action is happening in the lower parts. This case should be exceedingly
unlikely because the page reclaimer walks over the heap from low address
to high addresses, and we use a first-fit address-ordered allocation
policy.
Updates #35788.
Change-Id: Id335603b526ce3a0eb79ef286d1a4e876abc9cab
Reviewed-on: https://go-review.googlesource.com/c/go/+/218997
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
This change removes the concept of s.scavAddr in favor of explicitly
reserving and unreserving address ranges. s.scavAddr has several
problems with raciness that can cause the scavenger to miss updates, or
move it back unnecessarily, forcing future scavenge calls to iterate
over searched address space unnecessarily.
This change achieves this by replacing scavAddr with a second addrRanges
which is cloned from s.inUse at the end of each sweep phase. Ranges from
this second addrRanges are then reserved by scavengers (with the
reservation size proportional to the heap size) who are then able to
safely iterate over those ranges without worry of another scavenger
coming in.
Fixes#35788.
Change-Id: Ief01ae170384174875118742f6c26b2a41cbb66d
Reviewed-on: https://go-review.googlesource.com/c/go/+/208378
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Austin Clements <austin@google.com>
golang.org/cl/193604 fixed one bug when one encodes a string with the
",string" option: if SetEscapeHTML(false) is used, we should not be
using HTML escaping for the inner string encoding. The CL correctly
fixed that.
The CL also tried to speed up this edge case. By avoiding an entire new
call to Marshal, the new Issue34127 benchmark reduced its time/op by
45%, and lowered the allocs/op from 3 to 2.
However, that last optimization wasn't correct:
Since Go 1.2 every string can be marshaled to JSON without error
even if it contains invalid UTF-8 byte sequences. Therefore
there is no need to use Marshal again for the only reason of
enclosing the string in double quotes.
JSON string encoding isn't just about adding quotes and taking care of
invalid UTF-8. We also need to escape some characters, like tabs and
newlines.
The new code failed to do that. The bug resulted in the added test case
failing to roundtrip properly; before our fix here, we'd see an error:
invalid use of ,string struct tag, trying to unmarshal "\"\b\f\n\r\t\"\\\"" into string
If you pay close attention, you'll notice that the special characters
like tab and newline are only encoded once, not twice. When decoding
with the ",string" option, the outer string decode works, but the inner
string decode fails, as we are now decoding a JSON string with unescaped
special characters.
The fix we apply here isn't to go back to Marshal, as that would
re-introduce the bug with SetEscapeHTML(false). Instead, we can use a
new encode state from the pool - it results in minimal performance
impact, and even reduces allocs/op further. The performance impact seems
fair, given that we need to check the entire string for characters that
need to be escaped.
name old time/op new time/op delta
Issue34127-8 89.7ns ± 2% 100.8ns ± 1% +12.27% (p=0.000 n=8+8)
name old alloc/op new alloc/op delta
Issue34127-8 40.0B ± 0% 32.0B ± 0% -20.00% (p=0.000 n=8+8)
name old allocs/op new allocs/op delta
Issue34127-8 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=8+8)
Instead of adding another standalone test, we convert an existing
"string tag" test to be table-based, and add another test case there.
One test case from the original CL also had to be amended, due to the
same problem - when escaping '<' due to SetEscapeHTML(true), we need to
end up with double escaping, since we're using ",string".
Fixes#38173.
Change-Id: I2b0df9e4f1d3452fff74fe910e189c930dde4b5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/226498
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Since the ConnectionState will now be available during
verification, some code was moved around in order to
initialize and make available as much of the fields on
Conn as possible before the ConnectionState is verified.
Fixes#36736
Change-Id: I0e3efa97565ead7de5c48bb8a87e3ea54fbde140
Reviewed-on: https://go-review.googlesource.com/c/go/+/229122
Run-TryBot: Katie Hockman <katie@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Automatically rotate session ticket keys for servers
that don't already have sessionTicketKeys and that
haven't called SetSessionTicketKeys.
Now, session ticket keys will be rotated every 24 hours
with a lifetime of 7 days. This adds a small performance
cost to existing clients that don't provide a session
ticket encrypted with a fresh enough session ticket key,
which would require a full handshake.
Updates #25256
Change-Id: I15b46af7a82aab9a108bceb706bbf66243a1510f
Reviewed-on: https://go-review.googlesource.com/c/go/+/230679
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Per X690 Section 11.6 sort the order of SET of components when generating
DER. This CL makes no changes to Unmarshal, meaning unordered components
will still be accepted, and won't be re-ordered during parsing.
In order to sort the components a new encoder, setEncoder, which is similar
to multiEncoder is added. The functional difference is that setEncoder
encodes each component to a [][]byte, sorts the slice using a sort.Sort
interface, and then writes it out to the destination slice. The ordering
matches the output of OpenSSL.
Fixes#24254
Change-Id: Iff4560f0b8c2dce5aae616ba30226f39c10b972e
GitHub-Last-Rev: e52fc43658
GitHub-Pull-Request: golang/go#38228
Reviewed-on: https://go-review.googlesource.com/c/go/+/226984
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Colons are port separators, so it's risky to allow them in hostnames.
Per the CL 231377 rule, if we at least consider them invalid we will not
apply wildcard processing to them, making behavior a little more
predictable.
We were considering hostnames with colons valid (against spec) because
that meant we'd not ignore them in Common Name. (There was at least
one deployment that was putting colons in Common Name and expecting it
to verify.)
Now that Common Name is ignored by default, those clients will break
again, so it's a good time to drop the exception. Hopefully they moved
to SANs, where invalid hostnames are checked 1:1 (ignoring wildcards)
but still work. (If they didn't, this change means they can't use
GODEBUG=x509ignoreCN=0 to opt back in, but again you don't get to use a
legacy deprecated field AND invalid hostnames.)
Updates #24151
Change-Id: Id44b4fecb2d620480acdfc65fea1473f7abbca7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/231381
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Trailing dots are not allowed in certificate fields like CN and SANs
(while they are allowed and ignored as inputs to verification APIs).
Move to considering names with trailing dots in certificates as invalid
hostnames.
Following the rule of CL 231378, these invalid names lose wildcard
processing, but can still match if there is a 1:1 match, trailing dot
included, with the VerifyHostname input.
They also become ignored Common Name values regardless of the
GODEBUG=x509ignoreCN=X value, because we have to ignore invalid
hostnames in Common Name for #24151. The error message automatically
accounts for this, and doesn't suggest the environment variable. You
don't get to use a legacy deprecated field AND invalid hostnames.
(While at it, also consider wildcards in VerifyHostname inputs as
invalid hostnames, not that it should change any observed behavior.)
Change-Id: Iecdee8927df50c1d9daf904776b051de9f5e76ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/231380
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Common Name has been deprecated for 20 years, and has horrible
interactions with Name Constraints. The browsers managed to drop it last
year, let's try flicking the switch to disabled by default.
Return helpful errors for things that would get unbroken by flipping the
switch back with the environment variable.
Had to refresh a test certificate that was too old to have SANs.
Updates #24151
Change-Id: I2ab78577fd936ba67969d3417284dbe46e4ae02f
Reviewed-on: https://go-review.googlesource.com/c/go/+/231379
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
When the input or SAN dNSNames are not valid hostnames, the specs don't
define what should happen, because this should ideally never happen, so
everything we do is undefined behavior. Browsers get to just return an
error, because browsers can assume that the resolving layer is DNS. We
can't, names can be resolved by anything implementing a Dial function,
and the crypto/x509 APIs can also be used directly without actual
networks in sight.
Trying to process invalid hostnames leads to issues like #27591 where
wildcards glob stuff they aren't expected to, because wildcards are only
defined on hostnames.
Try to rationalize the behavior like this: if both the VerifyHostname
input and the SAN dNSNames are a valid hostname, follow the specs;
otherwise, only accept perfect 1:1 case-insensitive matches (without
wildcards or trailing dot processing).
This should allow us to keep supporting weird names, with less
unexpected side-effects from undefined behavior. Also, it's a rule, even
if completely made up, so something we can reason about and code against.
The commonName field does allow any string, but no specs define how to
process it. Processing it differently from dNSNames would be confusing,
and allowing it to match invalid hostnames is incompatible with Name
Constraint processing (#24151).
This does encourage invalid dNSNames, regrettably, but we need some way
for the standard API to match weird names, and the alternative of
keeping CN alive sounds less appealing.
Fixes#27591
Change-Id: Id2d515f068a17ff796a32b30733abe44ad4f0339
Reviewed-on: https://go-review.googlesource.com/c/go/+/231378
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
If dst slice length is zero in makeslicecopy then the called mallocgc is
using a fast path to only return a pointer to runtime.zerobase.
There may be no heapBits for that address readable by
bulkBarrierPreWriteSrcOnly which will cause a panic.
Protect against this by not calling bulkBarrierPreWriteSrcOnly if
there is nothing to copy. This is the case for all cases where the
length of the destination slice is zero.
runtime.growslice and runtime.typedslicecopy have fast paths that
do not call bulkBarrierPreWrite for zero copy lengths either.
Fixes#38929
Change-Id: I78ece600203a0a8d24de5b6c9eef56f605d44e99
Reviewed-on: https://go-review.googlesource.com/c/go/+/232800
Reviewed-by: Keith Randall <khr@golang.org>
Currently linearAlloc manages an exclusive "end" address for the top of
its reserved space. While unlikely for a linearAlloc to be allocated
with an "end" address hitting the top of the address space, it is
possible and could lead to overflow.
Avoid overflow by chopping off the last byte from the linearAlloc if
it's bumping up against the top of the address space defensively. In
practice, this means that if 32-bit platforms map the top of the address
space and use the linearAlloc to acquire arenas, the top arena will not
be usable.
Fixes#35954.
Change-Id: I512cddcd34fd1ab15cb6ca92bbf899fc1ef22ff6
Reviewed-on: https://go-review.googlesource.com/c/go/+/231338
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Currently when checking if we can grow the heap into the current arena,
we do an addition which may overflow. This is particularly likely on
32-bit systems.
Avoid this situation by explicitly checking for overflow, and adding in
some comments about when overflow is possible, when it isn't, and why.
For #35954.
Change-Id: I2d4ecbb1ccbd43da55979cc721f0cd8d1757add2
Reviewed-on: https://go-review.googlesource.com/c/go/+/231337
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
I added routines that can acquire/release a particular rank without
acquiring/releasing an associated lock. I added lockRankGscan as a rank
for acquiring/releasing the Gscan bit.
castogscanstatus() and casGtoPreemptScan() are acquires of the Gscan
bit. casfrom_Gscanstatus() is a release of the Gscan bit. casgstatus()
is like an acquire and release of the Gscan bit, since it will wait if
Gscan bit is currently set.
We have a cycle between hchan and Gscan. The acquisition of Gscan and
then hchan only happens in syncadjustsudogs() when the G is suspended,
so the main normal ordering (get hchan, then get Gscan) can't be
happening. So, I added a new rank lockRankHchanLeaf that is used when
acquiring hchan locks in syncadjustsudogs. This ranking is set so no
other locks can be acquired except other hchan locks.
Fixes#38922
Change-Id: I58ce526a74ba856cb42078f7b9901f2832e1d45c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228417
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
+----------------------------------------------------------------------+
| Hello, if you are reading this and run macOS, please test this code: |
| |
| $ GO111MODULE=on go get golang.org/dl/gotip@latest |
| $ gotip download |
| $ GODEBUG=x509roots=1 gotip test crypto/x509 -v -run TestSystemRoots |
+----------------------------------------------------------------------+
We currently have two code paths to extract system roots on macOS: one
uses cgo to invoke a maze of Security.framework APIs; the other is a
horrible fallback that runs "/usr/bin/security verify-cert" on every
root that has custom policies to check if it's trusted for SSL.
The fallback is not only terrifying because it shells out to a binary,
but also because it lets in certificates that are not trusted roots but
are signed by trusted roots, and because it applies some filters (EKUs
and expiration) only to roots with custom policies, as the others are
not passed to verify-cert. The other code path, of course, requires cgo,
so can't be used when cross-compiling and involves a large ball of C.
It's all a mess, and it broke oh-so-many times (#14514, #16532, #19436,
#20990, #21416, #24437, #24652, #25649, #26073, #27958, #28025, #28092,
#29497, #30471, #30672, #30763, #30889, #32891, #38215, #38365, ...).
Since macOS does not have a stable syscall ABI, we already dynamically
link and invoke libSystem.dylib regardless of cgo availability (#17490).
How that works is that functions in package syscall (like syscall.Open)
take the address of assembly trampolines (like libc_open_trampoline)
that jump to symbols imported with cgo_import_dynamic (like libc_open),
and pass them along with arguments to syscall.syscall (which is
implemented as runtime.syscall_syscall). syscall_syscall informs the
scheduler and profiler, and then uses asmcgocall to switch to a system
stack and invoke runtime.syscall. The latter is an assembly trampoline
that unpacks the Go ABI arguments passed to syscall.syscall, finally
calls the remote function, and puts the return value on the Go stack.
(This last bit is the part that cgo compiles from a C wrapper.)
We can do something similar to link and invoke Security.framework!
The one difference is that runtime.syscall and friends check errors
based on the errno convention, which Security doesn't follow, so I added
runtime.syscallNoErr which just skips interpreting the return value.
We only need a variant with six arguments because the calling convention
is register-based, and extra arguments simply zero out some registers.
That's plumbed through as crypto/x509/internal/macOS.syscall. The rest
of that package is a set of wrappers for Security.framework and Core
Foundation functions, like syscall is for libSystem. In theory, as long
as macOS respects ABI backwards compatibility (a.k.a. as long as
binaries built for a previous OS version keep running) this should be
stable, as the final result is not different from what a C compiler
would make. (One exception might be dictionary key strings, which we
make our own copy of instead of using the dynamic symbol. If they change
the value of those strings things might break. But why would they.)
Finally, I rewrote the crypto/x509 cgo logic in Go using those wrappers.
It works! I tried to make it match 1:1 the old logic, so that
root_darwin_amd64.go can be reviewed by comparing it to
root_cgo_darwin_amd64.go. The only difference is that we do proper error
handling now, and assume that if there is no error the return values are
there, while before we'd just check for nil pointers and move on.
I kept the cgo logic to help with review and testing, but we should
delete it once we are confident the new code works.
The nocgo logic is gone and we shall never speak of it again.
Fixes#32604Fixes#19561Fixes#38365
Awakens Cthulhu
Change-Id: Id850962bad667f71e3af594bdfebbbb1edfbcbb4
Reviewed-on: https://go-review.googlesource.com/c/go/+/227037
Reviewed-by: Katie Hockman <katie@golang.org>
Also encode the certificates in a way that's more
consistent with TLS 1.3 (with a 24 byte length prefix).
Note that this will have an additional performance cost
requiring clients to do a full handshake every 7 days
where previously they were able to use the same ticket
indefinitely.
Updates #25256
Change-Id: Ic4d1ba0d92773c490b33b5f6c1320d557cc7347d
Reviewed-on: https://go-review.googlesource.com/c/go/+/231317
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
We might as well grow the stack at least as large as we'll need for
the frame that is calling morestack. It doesn't help with the
lots-of-small-frames case, but it may help a bit with the
few-big-frames case.
Update #18138
Change-Id: I1f49c97706a70e20b30433cbec99a7901528ea52
Reviewed-on: https://go-review.googlesource.com/c/go/+/225800
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
match:
m = make([]T, x); copy(m, s)
for pointer free T and x==len(s) rewrite to:
m = mallocgc(x*elemsize(T), nil, false); memmove(&m, &s, x*elemsize(T))
otherwise rewrite to:
m = makeslicecopy([]T, x, s)
This avoids memclear and shading of pointers in the newly created slice
before the copy.
With this CL "s" is only be allowed to bev a variable and not a more
complex expression. This restriction could be lifted in future versions
of this optimization when it can be proven that "s" is not referencing "m".
Triggers 450 times during make.bash..
Reduces go binary size by ~8 kbyte.
name old time/op new time/op delta
MakeSliceCopy/mallocmove/Byte 71.1ns ± 1% 65.8ns ± 0% -7.49% (p=0.000 n=10+9)
MakeSliceCopy/mallocmove/Int 71.2ns ± 1% 66.0ns ± 0% -7.27% (p=0.000 n=10+8)
MakeSliceCopy/mallocmove/Ptr 104ns ± 4% 99ns ± 1% -5.13% (p=0.000 n=10+10)
MakeSliceCopy/makecopy/Byte 70.3ns ± 0% 68.0ns ± 0% -3.22% (p=0.000 n=10+9)
MakeSliceCopy/makecopy/Int 70.3ns ± 0% 68.5ns ± 1% -2.59% (p=0.000 n=9+10)
MakeSliceCopy/makecopy/Ptr 102ns ± 0% 99ns ± 1% -2.97% (p=0.000 n=9+9)
MakeSliceCopy/nilappend/Byte 75.4ns ± 0% 74.9ns ± 2% -0.63% (p=0.015 n=9+9)
MakeSliceCopy/nilappend/Int 75.6ns ± 0% 76.4ns ± 3% ~ (p=0.245 n=9+10)
MakeSliceCopy/nilappend/Ptr 107ns ± 0% 108ns ± 1% +0.93% (p=0.005 n=9+10)
Fixes#26252
Change-Id: Iec553dd1fef6ded16197216a472351c8799a8e71
Reviewed-on: https://go-review.googlesource.com/c/go/+/146719
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Speed up repeated HMAC operations with the same key by not recomputing
the first block of the inner and outer hashes in Reset and Sum, saving
two block computations each time.
This is a significant win for applications which hash many small
messages with the same key. In x/crypto/pbkdf2 for example, this
optimization cuts the number of block computations in half, speeding it
up by 25%-40% depending on the hash function.
The hash function needs to implement binary.Marshaler and
binary.Unmarshaler for this optimization to work, so that we can save
and restore its internal state. All hash functions in the standard
library are marshalable (CL 66710) but if the hash isn't marshalable, we
fall back on the old behaviour.
Marshaling the hashes does add a couple unavoidable new allocations, but
this only has to be done once, so the cost is amortized over repeated
uses. To minimize impact to applications which don't (or can't) reuse
hmac objects, marshaling is performed in Reset (rather than in New),
since calling Reset seems like a good indication that the caller intends
to reuse the hmac object later.
I had to add a boolean field to the hmac state to remember if we've
marshaled the hashes or not. This is paid for by removing the size and
blocksize fields, which were basically unused except for some
initialization work in New, and to fulfill the Size and Blocksize
methods. Size and Blocksize can just be forwarded to the underlying
hash, so there doesn't really seem to be any reason to waste space
caching their values.
crypto/hmac benchmarks:
name old time/op new time/op delta
HMAC_Reset/SHA1/1K-2 4.06µs ± 0% 3.77µs ± 0% -7.29% (p=0.000 n=8+10)
HMAC_Reset/SHA1/32-2 1.08µs ± 0% 0.78µs ± 1% -27.67% (p=0.000 n=10+10)
HMAC_Reset/SHA256/1K-2 10.3µs ± 0% 9.4µs ± 0% -9.03% (p=0.000 n=10+10)
HMAC_Reset/SHA256/32-2 2.32µs ± 0% 1.42µs ± 0% -38.87% (p=0.000 n=10+10)
HMAC_Reset/SHA512/1K-2 8.22µs ± 0% 7.04µs ± 0% -14.32% (p=0.000 n=9+9)
HMAC_Reset/SHA512/32-2 3.08µs ± 0% 1.89µs ± 0% -38.54% (p=0.000 n=10+9)
HMAC_New/SHA1/1K-2 4.86µs ± 1% 4.93µs ± 1% +1.30% (p=0.000 n=10+9)
HMAC_New/SHA1/32-2 1.91µs ± 1% 1.95µs ± 1% +1.84% (p=0.000 n=10+9)
HMAC_New/SHA256/1K-2 11.2µs ± 1% 11.2µs ± 0% ~ (p=1.000 n=9+10)
HMAC_New/SHA256/32-2 3.22µs ± 2% 3.19µs ± 2% -1.07% (p=0.018 n=9+10)
HMAC_New/SHA512/1K-2 9.54µs ± 0% 9.66µs ± 1% +1.31% (p=0.000 n=9+10)
HMAC_New/SHA512/32-2 4.37µs ± 1% 4.46µs ± 1% +1.97% (p=0.000 n=10+9)
name old speed new speed delta
HMAC_Reset/SHA1/1K-2 252MB/s ± 0% 272MB/s ± 0% +7.86% (p=0.000 n=8+10)
HMAC_Reset/SHA1/32-2 29.7MB/s ± 0% 41.1MB/s ± 1% +38.26% (p=0.000 n=10+10)
HMAC_Reset/SHA256/1K-2 99.1MB/s ± 0% 108.9MB/s ± 0% +9.93% (p=0.000 n=10+10)
HMAC_Reset/SHA256/32-2 13.8MB/s ± 0% 22.6MB/s ± 0% +63.57% (p=0.000 n=10+10)
HMAC_Reset/SHA512/1K-2 125MB/s ± 0% 145MB/s ± 0% +16.71% (p=0.000 n=9+9)
HMAC_Reset/SHA512/32-2 10.4MB/s ± 0% 16.9MB/s ± 0% +62.69% (p=0.000 n=10+9)
HMAC_New/SHA1/1K-2 211MB/s ± 1% 208MB/s ± 1% -1.29% (p=0.000 n=10+9)
HMAC_New/SHA1/32-2 16.7MB/s ± 1% 16.4MB/s ± 1% -1.81% (p=0.000 n=10+9)
HMAC_New/SHA256/1K-2 91.3MB/s ± 1% 91.5MB/s ± 0% ~ (p=0.950 n=9+10)
HMAC_New/SHA256/32-2 9.94MB/s ± 2% 10.04MB/s ± 2% +1.09% (p=0.021 n=9+10)
HMAC_New/SHA512/1K-2 107MB/s ± 0% 106MB/s ± 1% -1.29% (p=0.000 n=9+10)
HMAC_New/SHA512/32-2 7.32MB/s ± 1% 7.18MB/s ± 1% -1.89% (p=0.000 n=10+9)
name old alloc/op new alloc/op delta
HMAC_Reset/SHA1/1K-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA1/32-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA256/1K-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA256/32-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA512/1K-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA512/32-2 0.00B ±NaN% 0.00B ±NaN% ~ (all samples are equal)
HMAC_New/SHA1/1K-2 448B ± 0% 448B ± 0% ~ (all samples are equal)
HMAC_New/SHA1/32-2 448B ± 0% 448B ± 0% ~ (all samples are equal)
HMAC_New/SHA256/1K-2 480B ± 0% 480B ± 0% ~ (all samples are equal)
HMAC_New/SHA256/32-2 480B ± 0% 480B ± 0% ~ (all samples are equal)
HMAC_New/SHA512/1K-2 800B ± 0% 800B ± 0% ~ (all samples are equal)
HMAC_New/SHA512/32-2 800B ± 0% 800B ± 0% ~ (all samples are equal)
name old allocs/op new allocs/op delta
HMAC_Reset/SHA1/1K-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA1/32-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA256/1K-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA256/32-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA512/1K-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_Reset/SHA512/32-2 0.00 ±NaN% 0.00 ±NaN% ~ (all samples are equal)
HMAC_New/SHA1/1K-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
HMAC_New/SHA1/32-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
HMAC_New/SHA256/1K-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
HMAC_New/SHA256/32-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
HMAC_New/SHA512/1K-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
HMAC_New/SHA512/32-2 5.00 ± 0% 5.00 ± 0% ~ (all samples are equal)
x/crypto/pbkdf2 benchmarks:
name old time/op new time/op delta
HMACSHA1-2 4.63ms ± 0% 3.40ms ± 0% -26.58% (p=0.000 n=10+9)
HMACSHA256-2 9.75ms ± 0% 5.98ms ± 0% -38.62% (p=0.000 n=9+10)
name old alloc/op new alloc/op delta
HMACSHA1-2 516B ± 0% 708B ± 0% +37.21% (p=0.000 n=10+10)
HMACSHA256-2 549B ± 0% 772B ± 0% +40.62% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
HMACSHA1-2 8.00 ± 0% 10.00 ± 0% +25.00% (p=0.000 n=10+10)
HMACSHA256-2 8.00 ± 0% 10.00 ± 0% +25.00% (p=0.000 n=10+10)
Fixes#19941
Change-Id: I7077a6f875be68d3da05f7b3664e18514861886f
Reviewed-on: https://go-review.googlesource.com/c/go/+/27458
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reject base 128 encoded integers that aren't using minimal encoding,
specifically if the leading octet of an encoded integer is 0x80. This
only affects parsing of tags and OIDs, both of which expect this
encoding (see X.690 8.1.2.4.2 and 8.19.2).
Fixes#36881
Change-Id: I969cf48ac1fba7e56bac334672806a0784d3e123
GitHub-Last-Rev: fefc03d202
GitHub-Pull-Request: golang/go#38281
Reviewed-on: https://go-review.googlesource.com/c/go/+/227320
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The previous behavior directly contradicted the docs that have been in
place for years:
To unmarshal a JSON array into a slice, Unmarshal resets the
slice length to zero and then appends each element to the slice.
We could use reflect.New to create a new element and reflect.Append to
then append it to the destination slice, but benchmarks have shown that
reflect.Append is very slow compared to the code that manually grows a
slice in this file.
Instead, if we're decoding into an element that came from the original
backing array, zero it before decoding into it. We're going to be using
the CodeDecoder benchmark, as it has a slice of struct pointers that's
decoded very often.
Note that we still reuse existing values from arrays being decoded into,
as the documentation agrees with the existing implementation in that
case:
To unmarshal a JSON array into a Go array, Unmarshal decodes
JSON array elements into corresponding Go array elements.
The numbers with the benchmark as-is might seem catastrophic, but that's
only because the benchmark is decoding into the same variable over and
over again. Since the old decoder was happy to reuse slice elements, it
would save a lot of allocations by not having to zero and re-allocate
said elements:
name old time/op new time/op delta
CodeDecoder-8 10.4ms ± 1% 10.9ms ± 1% +4.41% (p=0.000 n=10+10)
name old speed new speed delta
CodeDecoder-8 186MB/s ± 1% 178MB/s ± 1% -4.23% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
CodeDecoder-8 2.19MB ± 0% 3.59MB ± 0% +64.09% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
CodeDecoder-8 76.8k ± 0% 92.7k ± 0% +20.71% (p=0.000 n=10+10)
We can prove this by moving 'var r codeResponse' into the loop, so that
the benchmark no longer reuses the destination pointer. And sure enough,
we no longer see the slow-down caused by the extra allocations:
name old time/op new time/op delta
CodeDecoder-8 10.9ms ± 0% 10.9ms ± 1% -0.37% (p=0.043 n=10+10)
name old speed new speed delta
CodeDecoder-8 177MB/s ± 0% 178MB/s ± 1% +0.37% (p=0.041 n=10+10)
name old alloc/op new alloc/op delta
CodeDecoder-8 3.59MB ± 0% 3.59MB ± 0% ~ (p=0.780 n=10+10)
name old allocs/op new allocs/op delta
CodeDecoder-8 92.7k ± 0% 92.7k ± 0% ~ (all equal)
I believe that it's useful to leave the benchmarks as they are now,
because the decoder does reuse memory in some cases. For example,
existing map elements are reused. However, subtle changes like this one
need to be benchmarked carefully.
Finally, add a couple of tests involving both a slice and an array of
structs.
Fixes#21092.
Change-Id: I8b1194f25e723a31abd146fbfe9428ac10c1389d
Reviewed-on: https://go-review.googlesource.com/c/go/+/191783
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit moves the isSelect bool below the ticket uint32. The
boolean was consuming 8 bytes of the struct. The uint32 was also
consuming 8 bytes, so we can pack isSelect below the uint32 and save 8
bytes. This reduces the sudog struct from 96 bytes to 88 bytes.
Change-Id: If555cdaf2f5eaa125e2590fc4d113dbc99750738
GitHub-Last-Rev: d63b4e086b
GitHub-Pull-Request: golang/go#36552
Reviewed-on: https://go-review.googlesource.com/c/go/+/214677
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The undef pass basically double-checks the relocation targets are
defined. We already do that in the reloc pass, and for external
relocations we check that when we emit relocations. The undef pass
doesn't seem necessary.
Change-Id: Iecfa654dc014fdc6e59c624cbf5948ad65fd367a
Reviewed-on: https://go-review.googlesource.com/c/go/+/232577
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This CL sets positions for errors from cals to load within the load
call itself, similar to how the rest of the code in pkg.go sets
positions right after the error is set on the package.
This allows the code to ensure that we only add positions either for
ImportPathErrors, or if an error was passed into load, and was set
using setLoadPackageDataError. (Though I'm wondering if the call
to setLoadPackageDataError should be done before the call to load).
Fixes#38034
Change-Id: I0748866933b4c1a329954b4b96640bef702a4644
Reviewed-on: https://go-review.googlesource.com/c/go/+/228784
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
This is a security hardening measure against HTTP request smuggling.
Thank you to ZeddYu for reporting this issue.
We weren't parsing things correctly anyway, allowing "identity" to be
combined with "chunked", and ignoring any Transfer-Encoding header past
the first. This is a delicate security surface that already broke
before, just be strict and don't add complexity to support cases not
observed in the wild (nginx removed "identity" support [1] and multiple
TE header support [2]) and removed by RFC 7230 (see page 81).
It'd probably be good to also drop support for anything other than
"chunked" in outbound TE headers, as "identity" is not a thing anymore,
and we are probably off-spec for anything other than "chunked", but it
should not be a security concern, so leaving it for now. See #38867.
[1]: https://hg.nginx.org/nginx/rev/fe5976aae0e3
[2]: https://hg.nginx.org/nginx/rev/aca005d232ff
Change-Id: If17d0827f9c6167a0b19a158e2bc5844ec803288
Reviewed-on: https://go-review.googlesource.com/c/go/+/231418
Reviewed-by: Katie Hockman <katie@golang.org>
Clients have to reject any HelloRetryRequest message that doesn't lead
to a change in the ClientHello. Instead, we were rejecting any HRR that
didn't select an alternative group, even if it sent a cookie, which
would change the CH.
The good news is that I know of no TLS servers that use or need HRRs
exclusively for cookies (which are mostly useful in DTLS as a way to
verify the source address). The bad news is that we poisoned the
ecosystem as Go 1.12 to 1.14 will reject such HRRs. Oops, hopefully no
one needed this.
No tests because neither Go nor s_server support cookies. This would
presumably get covered once we integrate BoGo.
Fixes#30149
Change-Id: I760fb1ded81148ac3096cf201cbc1e941374b83d
Reviewed-on: https://go-review.googlesource.com/c/go/+/231039
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
On some architectures, for async preemption the injected call
needs to clobber a register (usually REGTMP) in order to return
to the preempted function. As a consequence, the PC ranges where
REGTMP is live are not preemptible.
The uses of REGTMP are usually generated by the assembler, where
it needs to load or materialize a large constant or offset that
doesn't fit into the instruction. In those cases, REGTMP is not
live at the start of the instruction sequence. Instead of giving
up preemption in those cases, we could preempt it and restart the
sequence when resuming the execution. Basically, this is like
reissuing an interrupted instruction, except that here the
"instruction" is a Prog that consists of multiple machine
instructions. For this to work, we need to generate PC data to
mark the start of the Prog.
Currently this is only done for ARM64.
TODO: the split-stack function prologue is currently not async
preemptible. We could use this mechanism, preempt it and restart
at the function entry.
Change-Id: I37cb282f8e606e7ab6f67b3edfdc6063097b4bd1
Reviewed-on: https://go-review.googlesource.com/c/go/+/208126
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
There is a range of numbers lower than 0x7fff_ffff_ffff_ffff which
cannot be represented by a 64 bit float. We set that to the correct
limit beyond which conversions can happen properly.
It appears that the negative bound check can indeed by correctly handled
by I64TruncF64S. But we use the same limit for consistency.
Fixes#38839
Change-Id: Ib783a22cb331fba7e6955459f41c67f9ceb53461
Reviewed-on: https://go-review.googlesource.com/c/go/+/231837
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The {AND,OR,XOR}const ops can only take an int32 as an argument.
Make sure that when rewriting a BTx op to one of these, the result
has no high-order bits.
Fixes#38746
Change-Id: Ia7c5f76952329f60974bc033c29a5433610f3b28
Reviewed-on: https://go-review.googlesource.com/c/go/+/231977
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Replaced almost every use of Bytes with FillBytes.
Note that the approved proposal was for
func (*Int) FillBytes(buf []byte)
while this implements
func (*Int) FillBytes(buf []byte) []byte
because the latter was far nicer to use in all callsites.
Fixes#35833
Change-Id: Ia912df123e5d79b763845312ea3d9a8051343c0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230397
Reviewed-by: Robert Griesemer <gri@golang.org>
The Go 1.15 code freeze has just started. This is the time to update
all golang.org/x/... module versions that contribute packages to the
std and cmd modules in the standard library to latest master versions.
Those versions have already gone through code review, and now they
will undergo additional testing during the freeze period.
If there are new issues in these dependencies discovered, we have
the freeze period to deal with that. By the end of the freeze period,
we will have confidence that the Go 1.15 release and the dependency
versions it has selected are robust.
If one of the Go 1.15.x minor releases requires changing code in one of
the vendored packages, we'll be able to do so on top of the versions
that are selected here, and not be forced to use versions that came
from different time periods, or try to jump across multiple untested
versions in a minor release.
The dependency versions that are selected in this commit are:
github.com/google/pprof v0.0.0-20200229191704-1ebb73c60ed3
github.com/ianlancetaylor/demangle v0.0.0-20200414190113-039b1ae3a340
golang.org/x/arch v0.0.0-20200312215426-ff8b605520f4
golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
golang.org/x/mod v0.2.1-0.20200429172858-859b3ef565e2
golang.org/x/net v0.0.0-20200501053045-e0ff5e5a1de5
golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3
golang.org/x/text v0.3.3-0.20200430171850-afb9336c4530
golang.org/x/tools v0.0.0-20200504152539-33427f1b0364
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
github.com/ianlancetaylor/demangle is considered in scope and updated.
github.com/google/pprof is out of scope and was not updated.
For #36905.
Change-Id: Icb6996eb0df11f16edd9a42e04434012c0336354
Reviewed-on: https://go-review.googlesource.com/c/go/+/231657
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently, Value.Addr collapses flagRO, which is a combination of
flagEmbedRO and flagStickyRO, to flagStickyRO. This causes exported
fields of unexported anonymous field from Value.Addr.Elem read only.
This commit fix this by keeping all bits of flagRO from origin
value in Value.Addr. This should be safe due to following reasons:
* Result of Value.Addr is not CanSet because of it is not CanAddr
but not flagRO.
* Addr.Elem get same flagRO as origin, so it should behave same as
origin in CanSet.
Fixes#32772.
Change-Id: I79e086628c0fb6569a50ce63f3b95916f997eda1
GitHub-Last-Rev: 78e280e6d0
GitHub-Pull-Request: golang/go#32787
Reviewed-on: https://go-review.googlesource.com/c/go/+/183937
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
QueryPattern will now look up the current version of a module (if any)
before invoking queryProxy. This changes the interpretation of some
patterns (like "upgrade") and avoids the need to download earlier
versions for earlier versions when the current version is
+incompatible.
Fixes#37574
Change-Id: I4089d6099236493df13a7f88a252b5e5e556d383
Reviewed-on: https://go-review.googlesource.com/c/go/+/231599
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Introduces a few casts, mostly to fix rules that mix int64 and int32
off1 and off2.
Passes
GOARCH=arm64 gotip build -toolexec 'toolstash -cmp' -a std
Change-Id: I1ec75211f3bb8e521dcc5217cf29ab0655a84d79
Reviewed-on: https://go-review.googlesource.com/c/go/+/230840
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The function Abbrevs() was returning an array of structures by value,
which is not very efficient (this was showing up in a kubernetes
kubelet linker profile). Switch the function to return a slice
instead.
Improves linker DwarfGenerateDebugSyms running time when
linking the compiler in compilebench:
DwarfGenerateDebugSyms 29.2ms ±144% 23.9ms ±125% -17.89% (p=0.000 n=99+99)
Change-Id: I1132816563f208c63eb82a7932d9f2bcb2455324
Reviewed-on: https://go-review.googlesource.com/c/go/+/231558
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
CL 208617 introduced syscall.utf16PtrToString and
internal/syscall/windows.UTF16PtrToString functions.
Original version of CL 208617 did not include syscall.utf16PtrToString
and internal/syscall/windows.UTF16PtrToString max parameter. The
parameter was added by Brad at the request of Ian. Ian said:
"In some cases it seems at least possible that the null terminator is
not present. I think it would be safer if we passed a maximum length
here."
The syscall.utf16PtrToString and
internal/syscall/windows.UTF16PtrToString function are designed to work
with only null terminated strings. So max parameter is superfluous.
This change removes max parameter.
Updates #34972
Change-Id: Ifea65dbd86bca8a08353579c6b9636c6f963d165
Reviewed-on: https://go-review.googlesource.com/c/go/+/228858
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
When forwarding a request, a SingleHostReverseProxy appends the
request's path to the target URL's path. However, if certain path
elements are encoded, (such as %2F for slash in either the request or
target path), simply joining the URL.Path elements is not sufficient,
since the field holds the decoded path.
Since 87a605, the RawPath field was added which holds a decoding
hint for the URL. When joining URL paths, this decoding hint needs
to be taken into consideration.
As an example, if the target URL.Path is /a/b, and URL.RawPath
is /a%2Fb, joining the path with /c should result in /a/b/c
in URL.Path, and /a%2Fb/c in RawPath.
The added joinURLPath function combines the two URL's Paths,
while taking into account escaping, and replaces the previously used
singleJoiningSlash in NewSingleHostReverseProxy.
Fixes#35908
Change-Id: I45886aee548431fe4031883ab1629a41e35f1727
GitHub-Last-Rev: 7be6b8d421
GitHub-Pull-Request: golang/go#36378
Reviewed-on: https://go-review.googlesource.com/c/go/+/213257
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This makes the intent clearer, allows for another ellipsis and will aid
in future rewriting. While here, document boolean loads to explain register
contents.
Change-Id: I933db2813826d88819366191fbbea8fcee5e4dda
Reviewed-on: https://go-review.googlesource.com/c/go/+/230120
Reviewed-by: Keith Randall <khr@golang.org>
Ctty was always handled as a child descriptor, but in some cases
passing a parent descriptor would also work. This depended on
unpredictable details of the implementation. Reject those cases to
avoid confusion.
Also reject setting both Setctty and Foreground, as they use Ctty
in incompatible ways. It's unlikely that any programs set both fields,
as they don't make sense together.
Fixes#29458
Change-Id: Ieba2d625711fd4b82c8e65e1feed02fd1fb25e6d
Reviewed-on: https://go-review.googlesource.com/c/go/+/231638
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Normalization of number prefixes and exponents was added in CL 160184
directly in cmd/gofmt. The same behavior change needs to be applied in
the go/format package. This is done by moving the normalization code
into go/printer, behind a new StdFormat mode, which is then re-used
by both cmd/gofmt and go/format.
Note that formatting of Go source code changes over time, so the exact
byte output produced by go/printer may change between versions of Go
when using StdFormat mode. What is guaranteed is that the new formatting
is equivalent Go code.
Clients looking to format Go code with standard formatting consistent
with cmd/gofmt and go/format would need to start using this flag, but
a better alternative is to use the go/format package instead.
Benchstat numbers on go test go/printer -bench=BenchmarkPrint:
name old time/op new time/op delta
Print-8 4.56ms ± 1% 4.57ms ± 0% ~ (p=0.700 n=3+3)
name old alloc/op new alloc/op delta
Print-8 467kB ± 0% 467kB ± 0% ~ (p=1.000 n=3+3)
name old allocs/op new allocs/op delta
Print-8 17.2k ± 0% 17.2k ± 0% ~ (all equal)
That benchmark data doesn't contain any numbers that need to be
normalized. More work needs to be performed when formatting Go code
with numbers, but it is unavoidable to produce standard formatting.
Fixes#37476.
For #37453.
Change-Id: If50bde4035c3ee6e6ff0ece5691f6d3566ffe8d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/231461
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Adding the usage of PCALIGN directive for arm64, and updating some
details on using some directives defined in the textflag.h file.
Change-Id: I43d363e3337939bab69b856831caf06803a292d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/227801
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit adds a new option to the x86 assembler. If the
GOAMD64 environment variable is set to alignedjumps (the
default) and we're doing a 64 bit build, the assembler will
make sure that neither stand alone nor macro-fused jumps will
end on or cross 32 byte boundaries. To achieve this, functions
are aligned on 32 byte boundaries, rather than 16 bytes, and
jump instructions are padded to ensure that they do not
cross or end on 32 byte boundaries. Jumps are padded
by adding a NOP instruction of the appropriate length before
the jump.
The commit is likely to result in larger binary sizes when
GOAMD64=alignedjumps. On the binaries tested so far, an
increase of between 1.4% and 1.5% has been observed.
Updates #35881
Co-authored-by: David Chase <drchase@google.com>
Change-Id: Ief0722300bc3f987098e4fd92b22b14ad6281d91
Reviewed-on: https://go-review.googlesource.com/c/go/+/219357
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
A symbol being reachable doesn't imply its type descriptor is
needed. Don't mark it.
If the type is converted to interface somewhere in the program,
there will be an explicit use of the type descriptor, which
will make it marked.
A println("hello") program before and after
-rwxr-xr-x 1 cherryyz primarygroup 1259824 Apr 30 23:00 hello
-rwxr-xr-x 1 cherryyz primarygroup 1169680 Apr 30 23:10 hello
Updates #38782.
Updates #6853.
Change-Id: I88884c126ce75ba073f1ba059c4b892c87d2ac96
Reviewed-on: https://go-review.googlesource.com/c/go/+/231397
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alessandro Arzilli <alessandro.arzilli@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
(Reland of golang.org/cl/33677.)
This CL adds a UsesCgo config setting to go/types to specify that the
_cgo_gotypes.go file generated by cmd/cgo has been provided as a
source file. The type checker then internally resolves C.bar qualified
identifiers to _Cfoo_bar as appropriate.
It also adds support to srcimporter to automatically run cgo.
Unfortunately, this functionality is not compatible with overriding
OpenFile, because cmd/cgo and gcc will directly open files.
Updates #16623.
Updates #35721.
Change-Id: Ib179d55c8c589916f98ceeae0b9a3e746157253a
Reviewed-on: https://go-review.googlesource.com/c/go/+/231459
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Cgo's initial design for handling "#define foo int*" involved
rewriting "C.foo" to "*_Ctype_int" everywhere. But now that we have
type aliases, we can declare "type _Ctype_foo = *_Ctype_int" once, and
then rewrite "C.foo" to just "_Ctype_foo".
This is important for go/types's UsesCgo mode, where go/types needs to
be able to figure out a type for each C.foo identifier using only the
information written into _cgo_gotypes.go.
Fixes#38649.
Change-Id: Ia0f8c2d82df81efb1be5bc26195ea9154c0af871
Reviewed-on: https://go-review.googlesource.com/c/go/+/230037
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Add code to the loader to enforce the invariant that there is only a
single level of 'outer' symbol nesting. That is, if outer(X) = Y, then
outer(Y) is always zero.
Revise foldSubSymbolOffset based on the new invariant, allowing it to
be inlined, and then fix the various "for s.Outer != nil" loops in the
linker to just use an "if" instead of a loop.
Change-Id: Ib895702bc6de52718248f09a5368b84cb2e0a3fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/231137
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
In the dev.link branch we continued developing the new object
file format support and the linker improvements described in
https://golang.org/s/better-linker . Since the last merge, more
progress has been made to improve the new linker, with
improvements on both linker speed and memory usage.
This is a clean merge.
Change-Id: I38516d6c4b41021bc61c1b9886e701de5fa2b0f1
Convert the part that uses relocations to use loader.ExtReloc
directly. It still uses sym.Symbols for now, but not sym.Relocs.
This reduces some memory usage: linking cmd/compile with external
linking,
name old allocs/op new allocs/op delta
Loadlibfull_GC 52.2MB ± 0% 13.9MB ± 0% -73.40% (p=0.008 n=5+5)
name old live-B new live-B delta
Loadlibfull_GC 75.5M ± 0% 61.9M ± 0% -18.02% (p=0.008 n=5+5)
Change-Id: I317ecbf516063c42b255b2caba310ea6281342d7
Reviewed-on: https://go-review.googlesource.com/c/go/+/231319
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The Ctty field is a child descriptor number when Setctty is set,
but a parent descriptor when Foreground is set. This is absurd
but changing either behavior breaks existing programs.
With this change we at least document how it works.
For #29458
Change-Id: If9cf0a1a1e6ed0d4a4edae5043016d5b4ee3308b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229768
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Implement special case handling and testing to ensure
conformance with the C99 standard annex G.6 Complex arithmetic.
Fixes#29320
Change-Id: Id72eb4c5a35d5a54b4b8690d2f7176ab11028f1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/220689
Reviewed-by: Robert Griesemer <gri@golang.org>
The new package "internal/unsafeheader" depends only on "unsafe", and
provides declarations equivalent to reflect.StringHeader and
reflect.SliceHeader but with Data fields of the proper unsafe.Pointer
type (instead of uintptr).
Unlike the types it replaces, the "internal/unsafeheader" package has
a regression test to ensure that its header types remain equivalent to
the declarations provided by the "reflect" package.
Since "internal/unsafeheader" has almost no dependencies, it can be
used in other low-level packages such as "syscall" and "reflect".
This change is based on the corresponding x/sys change in CL 231177.
Fixes#37805
Updates #19367
Change-Id: I7a6d93ef8dd6e235bcab94e7c47270aad047af31
Reviewed-on: https://go-review.googlesource.com/c/go/+/231223
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Now that the loader's internal storage mechanism for symbol alignment
is array-based and not map-based, we can go back to computing symbol
alignment in the parallel-by-section section of dodata.
With this patch plus the previous one, this produces a small
kubelet speedup:
$ benchstat out.devlink.txt out.align.txt
name old time/op new time/op delta
RelinkKubelet 13.3s ± 2% 13.1s ± 2% -1.27% (p=0.000 n=20+20)
RelinkKubelet-WithoutDebug 7.36s ± 5% 7.14s ± 3% -3.00% (p=0.000 n=20+20)
Change-Id: I9eb0e8fea6aeb12f188f499e9031d5a3a23232c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/231221
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Switch the storage mechanism for symbol alignment away from a map and
to a slice of uint8 values per symbol, where value K indicates
alignment 2^K. Intended to help speed up alignment get/set in dodata.
Change-Id: I26416e455c808f697dd0d7f6d2582247ee5c5b40
Reviewed-on: https://go-review.googlesource.com/c/go/+/231220
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Using 'go get x.go' instead of 'go build x.go' or some other
go command is a common mistake. By that mistake, a user gets
a misleading error message about unsuccessful `x.go` domain lookup.
This improvement handles such cases, by validating, whether the
argument hasn't specified version, has .go suffix, and either has
no slashes or such file locally exists. Handled both GOPATH
and GOMOD modes.
Fixes#38478
Change-Id: I583a4ef7f7ca8901deb07ebc811e2b3c0e828fa6
Reviewed-on: https://go-review.googlesource.com/c/go/+/229938
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parseFloatPrefix accepts a string if it has a valid floating-point
number as prefix. Make sure that "infi", "infin", ... etc. are
accepted as valid numbers "inf" with suffix "i", "in", etc. This
is important for parsing complex numbers such as "0+infi".
This change does not affect the correctness of ParseFloat because
ParseFloat rejects strings that contain a suffix after a valid
floating-point number.
Updates #36771.
Change-Id: Ie1693a8ca2f8edf07b57688e0b35751b7100d39d
Reviewed-on: https://go-review.googlesource.com/c/go/+/231237
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Currently, for external relocations, the ExtReloc structure
contains all the fields of the relocation. In fact, many of the
fields are the same with the original relocation. So, instead, we
can just use an index to reference the original relocation and
not expand the fields.
There is one place where we modify relocation type: changing
R_DWARFSECTREF to R_ADDR. Get away with it by changing
downstreams.
It also makes it easier to retrieve the reloc variant.
This reduces some allocation. Linking cmd/compile with external
linking,
name old alloc/op new alloc/op delta
Reloc_GC 34.1MB ± 0% 22.7MB ± 0% -33.30% (p=0.000 n=5+4)
Change-Id: Id08a89ed2aee705296886d3b95014b806a0d55cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/231217
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
In the dev.link branch we continued developing the new object
file format support and the linker improvements described in
https://golang.org/s/better-linker . Since the last merge, more
progress has been made to improve the new linker.
This is a clean merge.
Change-Id: Ide5ad6fcec9cede99e9b21c4548929b4ba1f4185
Revise the signature for "relocsym" to reflect the fact that many of
its arguments are invariant: push the invariant args into a struct and
pass the struct by reference.
Add a facility for doing batch allocation of external relocations in
relocsym, so that we don't wind up with wasted space due to the
default "append" behavior.
This produces a small speedup in linking kubelet:
$ benchstat out.devlink.txt out.dodata.txt
name old time/op new time/op delta
RelinkKubelet 14.2s ± 2% 13.8s ± 2% -3.11% (p=0.000 n=19+19)
RelinkKubelet-WithoutDebug 8.02s ± 3% 7.73s ± 3% -3.67% (p=0.000 n=20+20)
Change-Id: I8bc94c366ae792a5b0f23697b8e0108443a7a748
Reviewed-on: https://go-review.googlesource.com/c/go/+/231138
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Under the scavenge lock it's possible to ready a goroutine (or now
injectglist, which has mostly the same effect) which could cause an
unpark trace event to be emitted. If there's no active trace buffer for
the P, then we might acquire the lock. The total order between the two
is correct, but there's no partial order edge between them. Add in the
edge.
Change-Id: I3fc5d86a3b6bdd0b5648181fb76b5ebc90c3d69f
Reviewed-on: https://go-review.googlesource.com/c/go/+/231197
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This change modifies the semantics of waking the scavenger: rather than
wake on any update to pacing, wake when we know we will have work to do,
that is, when the sweeper is done. The current scavenger runs over the
address space just once per GC cycle, and we want to maximize the chance
that the scavenger observes the most attractive scavengable memory in
that pass (i.e. free memory with the highest address), so the timing is
important. By having the scavenger awaken and reset its search space
when the sweeper is done, we increase the chance that the scavenger will
observe the most attractive scavengable memory, because no more memory
will be freed that GC cycle (so the highest scavengable address should
now be available).
Furthermore, in applications that go idle, this means the background
scavenger will be awoken even if another GC doesn't happen, which isn't
true today.
However, we're unable to wake the scavenger directly from within the
sweeper; waking the scavenger involves modifying timers and readying
goroutines, the latter of which may trigger an allocation today (and the
sweeper may run during allocation!). Instead, we do the following:
1. Set a flag which is checked by sysmon. sysmon will clear the flag and
wake the scavenger.
2. Wake the scavenger unconditionally at sweep termination.
The idea behind this policy is that it gets us close enough to the state
above without having to deal with the complexity of waking the scavenger
in deep parts of the runtime. If the application goes idle and sweeping
finishes (so we don't reach sweep termination), then sysmon will wake
the scavenger. sysmon has a worst-case 20 ms delay in responding to this
signal, which is probably fine if the application is completely idle
anyway, but if the application is actively allocating, then the
proportional sweeper should help ensure that sweeping ends very close to
sweep termination, so sweep termination is a perfectly reasonable time
to wake up the scavenger.
Updates #35788.
Change-Id: I84289b37816a7d595d803c72a71b7f5c59d47e6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/207998
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This change adds two bits of logic to the scavenger's pacing. Firstly,
it checks to make sure we scavenged at least one physical page, if we
released a non-zero amount of memory. If we try to release less than one
physical page, most systems will release the whole page, which could
lead to memory corruption down the road, and this is a signal we're in
this situation.
Secondly, the scavenger's pacing logic now checks to see if the time a
scavenging operation takes is measured to be exactly zero or negative.
The exact zero case can happen if time update granularity is too large
to effectively capture the time the scavenging operation took, like on
Windows where the OS timer frequency is generally 1ms. The negative case
should not happen, but we're being defensive (against kernel bugs, bugs
in the runtime, etc.). If either of these cases happen, we fall back to
Go 1.13 behavior: assume the scavenge operation took around 10µs per
physical page. We ignore huge pages in this case because we're in
unknown territory, so we choose to be conservative about pacing (huge
pages could only increase the rate of scavenging).
Currently, the scavenger is broken on Windows because the granularity of
time measurement is around 1 ms, which is too coarse to measure how fast
we're scavenging, so we often end up with a scavenging time of zero,
followed by NaNs and garbage values in the pacing logic, which usually
leads to the scavenger sleeping forever.
Fixes#38617.
Change-Id: Iaaa2a4cbb21338e1258d010f7362ed58b7db1af7
Reviewed-on: https://go-review.googlesource.com/c/go/+/229997
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Austin Clements <austin@google.com>
This CL changes the arm64 TBZ/TBNZ block from using Aux to using
a (typed) AuxInt. The corresponding rules have also been changed
to be typed.
Passes
GOARCH=arm64 gotip build -toolexec 'toolstash -cmp' -a std
Change-Id: I98d0cd2a791948f1db13259c17fb1b9b2807a043
Reviewed-on: https://go-review.googlesource.com/c/go/+/230839
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Tweak doDataSect to reduce symbol sorting overhead, and calculate size
ahead of allocating the ctxt.datap slice. Yields a small speedup
(2-3%) linking kubelet.
Change-Id: I82869f5276caa4bee9f6e6f41da2b240e601ce50
Reviewed-on: https://go-review.googlesource.com/c/go/+/231047
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Adddynrel2 is a function pointer. In dynrelocsym we pass &r to
it, which will cause r to escape. Pass it by value instead.
Linking cmd/compile,
name old alloc/op new alloc/op delta
Dodata_GC 15.8MB ± 0% 5.9MB ± 0% -62.55% (p=0.008 n=5+5)
Change-Id: Ib86005d1026ebaca57777b27ead037e613585f44
Reviewed-on: https://go-review.googlesource.com/c/go/+/231045
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Archreloc2 is a function pointer. It will escape its pointer
arguments. In relocsym, as we pass &r and &rr to Archreloc2, it
causes them to escape, even if Archreloc2 is not actually called.
Instead, pass r by value. loader.Reloc2 is a small structure
which is intended to be passed by value.
For rr, as Archreloc2 will likely return true, we speculatively
add it to extRelocs slice and use that space to pass to
Archreloc2.
Linking cmd/compile,
name old alloc/op new alloc/op delta
Dwarfcompress_GC 110MB ± 0% 24MB ± 0% -78.34% (p=0.008 n=5+5)
Reloc_GC 24.6MB ± 0% 0.0MB ± 0% -100.00% (p=0.029 n=4+4)
Linking cmd/compile using external linking
name old alloc/op new alloc/op delta
Reloc_GC 152MB ± 0% 36MB ± 0% -76.07% (p=0.008 n=5+5)
Change-Id: I1415479e0c17ea9787f9a62453dce00ad9ea792f
Reviewed-on: https://go-review.googlesource.com/c/go/+/231077
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
'go mod verify' checksums one module zip at a time, which is
CPU-intensive on most modern machines with fast disks. As a result, one
can see a CPU bottleneck when running the command on, for example, a
module where 'go list -m all' lists ~440 modules:
$ /usr/bin/time go mod verify
all modules verified
11.47user 0.77system 0:09.41elapsed 130%CPU (0avgtext+0avgdata 24284maxresident)k
0inputs+0outputs (0major+4156minor)pagefaults 0swaps
Instead, verify up to GOMAXPROCS zips at once, which should line up
pretty well with the amount of processors we can use on a machine. The
results below are obtained via 'benchcmd -n 5 GoModVerify go mod verify'
on the same large module.
name old time/op new time/op delta
GoModVerify 9.35s ± 1% 3.03s ± 2% -67.60% (p=0.008 n=5+5)
name old user-time/op new user-time/op delta
GoModVerify 11.2s ± 1% 16.3s ± 3% +45.38% (p=0.008 n=5+5)
name old sys-time/op new sys-time/op delta
GoModVerify 841ms ± 9% 865ms ± 8% ~ (p=0.548 n=5+5)
name old peak-RSS-bytes new peak-RSS-bytes delta
GoModVerify 27.8MB ±13% 50.7MB ±27% +82.01% (p=0.008 n=5+5)
The peak memory usage nearly doubles, and there is some extra overhead,
but it seems clearly worth the tradeoff given that we see a ~3x speedup
on my laptop with 4 physical cores. The vast majority of developer
machines nowadays should have 2-4 cores at least.
No test or benchmark is included; one can benchmark 'go mod verify'
directly, as I did above. The existing tests also cover correctness,
including any data races via -race.
Fixes#38623.
Change-Id: I45d8154687a6f3a6a9fb0e2b13da4190f321246c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229817
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
A recent change added a title to the HTML coverage report but
neglected to include the package name. Add the package name here.
It's a little trickier than you'd think because there may be multiple
packages and we don't want to parse the files, so we just extract
a directory name from the path of the first file. This will almost
always be right, and has the advantage that it gives a better result
for package main. There are rare cases it will get wrong, but that
will be no hardship.
If this turns out not to be good enough, we can refine it.
Fixes#38609
Change-Id: I2201f6caef906e0b0258b90d7de518879041fe72
Reviewed-on: https://go-review.googlesource.com/c/go/+/230517
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Omits printing the file:line:column when trying to open either
* non-existent files
* files without permission
Given:
go tool compile x.go
For either of x.go not existing, or if no read permissions:
* Before:
x.go:0: open x.go: no such file or directory
x.go:0: open x.go: permission denied
* After:
open x.go: no such file or directory
open x.go: permission denied
While here, noticed an oddity with the Linux builders, that appear
to always be running under root, hence the test for permission errors
with 0222 -W-*-W-*-W- can't pass on linux-amd64 builders.
The filed bug is #38608.
Fixes#36437
Change-Id: I9645ef73177c286c99547e3a0f3719fa07b35cb5
Reviewed-on: https://go-review.googlesource.com/c/go/+/229357
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
When I browsed the source code, I saw that there is no corresponding example of this function. I am not sure if there is a need for an increase, this is my first time to submit CL.
Change-Id: Idbf4e1e1ed2995176a76959d561e152263a2fd26
Reviewed-on: https://go-review.googlesource.com/c/go/+/230741
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
The switch statement can be statically optimized by the compiler,
whereas similarly optimizing the map index expression would require
additional compiler analysis to detect the map is never mutated.
Updates #10848.
Change-Id: I2fc70d4a34dc545677b99f218b51023c7891bbbd
Reviewed-on: https://go-review.googlesource.com/c/go/+/231041
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Currently, we emit stack maps and register maps at almost every
instruction. This was originally intended to support non-cooperative
preemption, but was only ever used for debug call injection. Now debug
call injection also uses conservative frame scanning. As a result,
stack maps are only needed at call sites and register maps aren't
needed at all except that we happen to also encode unsafe-point
information in the register map PCDATA stream.
This CL reduces stack maps to only appear at calls, and replace full
register maps with just safe/unsafe-point information.
This is all protected by the go115ReduceLiveness feature flag, which
is defined in both runtime and cmd/compile.
This CL significantly reduces binary sizes and also speeds up compiles
and links:
name old exe-bytes new exe-bytes delta
BinGoSize 15.0MB ± 0% 14.1MB ± 0% -5.72%
name old pcln-bytes new pcln-bytes delta
BinGoSize 3.14MB ± 0% 2.48MB ± 0% -21.08%
name old time/op new time/op delta
Template 178ms ± 7% 172ms ±14% -3.59% (p=0.005 n=19+19)
Unicode 71.0ms ±12% 69.8ms ±10% ~ (p=0.126 n=18+18)
GoTypes 655ms ± 8% 615ms ± 8% -6.11% (p=0.000 n=19+19)
Compiler 3.27s ± 6% 3.15s ± 7% -3.69% (p=0.001 n=20+20)
SSA 7.10s ± 5% 6.85s ± 8% -3.53% (p=0.001 n=19+20)
Flate 124ms ±15% 116ms ±22% -6.57% (p=0.024 n=18+19)
GoParser 156ms ±26% 147ms ±34% ~ (p=0.070 n=19+19)
Reflect 406ms ± 9% 387ms ±21% -4.69% (p=0.028 n=19+20)
Tar 163ms ±15% 162ms ±27% ~ (p=0.370 n=19+19)
XML 223ms ±13% 218ms ±14% ~ (p=0.157 n=20+20)
LinkCompiler 503ms ±21% 484ms ±23% ~ (p=0.072 n=20+20)
ExternalLinkCompiler 1.27s ± 7% 1.22s ± 8% -3.85% (p=0.005 n=20+19)
LinkWithoutDebugCompiler 294ms ±17% 273ms ±11% -7.16% (p=0.001 n=19+18)
(https://perf.golang.org/search?q=upload:20200428.8)
The binary size improvement is even slightly better when you include
the CLs leading up to this. Relative to the parent of "cmd/compile:
mark PanicBounds/Extend as calls":
name old exe-bytes new exe-bytes delta
BinGoSize 15.0MB ± 0% 14.1MB ± 0% -6.18%
name old pcln-bytes new pcln-bytes delta
BinGoSize 3.22MB ± 0% 2.48MB ± 0% -22.92%
(https://perf.golang.org/search?q=upload:20200428.9)
For #36365.
Change-Id: I69448e714f2a44430067ca97f6b78e08c0abed27
Reviewed-on: https://go-review.googlesource.com/c/go/+/230544
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
These are necessarily deeply non-preemptible, so there's no point in
emitting stack maps for them. We already mark them as unsafe points,
so this only affects the runtime, since user code does not emit stack
maps at unsafe points. SSAGenState.PrepareCall also excludes them when
it's sanity checking call stack maps.
Right now this only drops a handful of unnecessary stack maps from the
runtime, but we're about to start emitting stack maps only at calls
for user code, too. At that point, this will matter much more.
For #36365.
Change-Id: Ib3abfedfddc8e724d933a064fa4d573500627990
Reviewed-on: https://go-review.googlesource.com/c/go/+/230542
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The compiler currently conflates whether a Value has a stack map with
whether it's an unsafe point. For the most part, unsafe-points don't
have stack maps, so this is mostly fine, but call instructions can be
both an unsafe-point *and* have a stack map. For example, none of the
instructions in a nosplit function should be preemptible, but calls
must still have stack maps in case the called function grows the stack
or get preempted.
Currently, the compiler can't distinguish this case, so calls in
nosplit functions are marked as safe-points just because they have
stack maps. This is particularly problematic if a nosplit function
calls another nosplit function, since this can introduce a preemption
point where there should be none.
We realized this was a problem for split-stack prologues a while back,
and CL 207349 changed the encoding of unsafe-points to use the
register map index instead of the stack map index so we could record
both a stack map and an unsafe-point at the same instruction. But this
was never extended into the compiler.
This CL fixes this problem in the compiler. We make LivenessIndex
slightly more abstract by separating unsafe-point marks from stack and
register map indexes. We map this to the PCDATA encoding later when
producing Progs. This isn't enough to fix the whole problem for
nosplit functions, because obj still adds prologues and marks those as
preemptible, but it's a step in the right direction.
I checked this CL by comparing maps before and after this change in
the runtime and net/http. In net/http, unsafe-points match exactly; at
anything that isn't an unsafe-point, both the stack and register maps
are unchanged by this CL. In the runtime, at every point that was a
safe-point before this change, the stack maps agree (and mostly the
runtime doesn't have register maps at all now). In both, all CALLs
(except write barrier calls) have stack maps.
For #36365.
Change-Id: I066628938b02e78be5c81a6614295bcf7cc566c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/230541
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Currently, this function conflates two (easily conflated!) concepts:
whether a Value is a safe-point and whether it has a stack map. In
particular, call Values may not be a safe-point, but may need a stack
map anyway in case the called function grows the stack.
Hence, rename this function to "hasStackMap", since that's really what
it represents.
For #36365.
Change-Id: I89839de0be8db3be3f0d3a7fb5fcf0b0b6ebc98a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230540
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
PanicBounds and PanicExtend are lowered to runtime calls (with a
non-Go ABI), but are not currently marked as calls. Since liveness
analysis only emits stack maps at calls in the runtime, this means
these panic call sites in the runtime won't get a stack map. These
almost immediately turn into throws in the runtime, but there's still
a chance they'll try to grow the stack first, which would lead to a
different panic.
To fix this, mark these operations as calls.
Outside the runtime, we currently emit stack maps for everything that
isn't an unsafe-point, so these panic calls get stack maps by default.
However, we're about to move to emitting stack maps only at call
sites, at which point this will start to matter outside the runtime as
well.
I confirmed that this has no effect on anything but PCDATA/FUNCDATA in
runtime and net/http.
For #36365.
Change-Id: Ic5bb463fd152cc320c815dc04cf62005261ae169
Reviewed-on: https://go-review.googlesource.com/c/go/+/230539
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
A debugger can inject a call at almost any PC, which causes
significant complications with stack scanning and growth. Currently,
the runtime solves this using precise stack maps and register maps at
nearly all PCs, but these extra maps require roughly 5% of the binary.
These extra maps were originally considered worth this space because
they were intended to be used for non-cooperative preemption, but are
now used only for debug call injection.
This CL switches from using precise maps to instead using conservative
frame scanning, much like how non-cooperative preemption works. When a
call is injected, the runtime flushes all potential pointer registers
to the stack, and then treats that frame as well as the interrupted
frame conservatively.
The limitation of conservative frame scanning is that we cannot grow
the goroutine stack. That's doable because the previous CL switched to
performing debug calls on a new goroutine, where they are free to grow
the stack.
With this CL, there are no remaining uses of precise register maps
(though we still use the unsafe-point information that's encoded in
the register map PCDATA stream), and stack maps are only used at call
sites.
For #36365.
Change-Id: Ie217b6711f3741ccc437552d8ff88f961a73cee0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229300
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Currently, when a debugger injects a call, that call happens on the
goroutine where the debugger injected it. However, this requires
significant runtime complexity that we're about to remove.
To prepare for this, this CL switches to a different approach that
leaves the interrupted goroutine parked and runs the debug call on a
new goroutine. When the debug call returns, it resumes the original
goroutine.
This should be essentially transparent to debuggers. It follows the
exact same call injection protocol and ensures the whole protocol
executes indivisibly on a single OS thread. The only difference is
that the current G and stack now change part way through the protocol.
For #36365.
Change-Id: I68463bfd73cbee06cfc49999606410a59dd8f653
Reviewed-on: https://go-review.googlesource.com/c/go/+/229299
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Currently, newproc1 allocates, initializes, and schedules a new
goroutine. We're about to change debug call injection in a way that
will need to create a new goroutine without immediately scheduling it.
To prepare for that, make scheduling the responsibility of newproc1's
caller. Currently, there's exactly one caller (newproc), so this
simply shifts that responsibility.
For #36365.
Change-Id: Idacd06b63e738982e840fe995d891bfd377ce23b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229298
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
golang.org/cl/229763 removed the documentation of requirements of
the function passed to FieldsFunc. The current implementation does
not require functions to return consistent results but this had not
been the case for previous implementations.
Add the requirement for consistent results back to the documentation
to allow for future implementations to be more allocation efficient
for an output with more than 32 fields. This is possible with a two
pass algorithm first determining the number of fields used to allocate
the output slice and then splitting the input into fields.
While at it align the documentation of bytes.FieldsFunc with
strings.FieldFunc.
Fixes#38630
Change-Id: Iabbf9ca3dff0daa41f4ec930a21a3dd98e19f122
Reviewed-on: https://go-review.googlesource.com/c/go/+/230797
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
When then go command is run with -trimpath, it will now use
-fdebug-prefix-map when invoking the C compiler (if supported) to
replace the source root directory with a dummy root directory.
This should prevent source directories from appearing either literally
or in compressed DWARF in linked binaries.
Updates #36072
Change-Id: Iedd08d5e886f81e981f11248a1be4ed4f58bdd29
Reviewed-on: https://go-review.googlesource.com/c/go/+/212101
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This allows writing
// F does a thing.
//go:noinline
func F()
without the //go:noinline or other directive (such as //line)
ending up looking like extra words in the doc comment.
Fixes#37974.
Change-Id: Ic738d72802cc2fa448f7633915e7126d2f76d8ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/224737
Reviewed-by: Robert Griesemer <gri@golang.org>
When parsing go.mod files found via file-path replacements, it's safer to
use lockedfile.Read instead of ioutil.ReadFile, in case of overwriting by
other concurrent go commands.
Change-Id: I7dcac3bb5ada84bee1eb634b39f813c461ef103a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230838
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Previously, non-standard attributes in Name.Names were being
omitted when printed using Name.String(). Now, any non-standard
attributes that would not already be printed in Name.String()
are being added temporarily to Name.ExtraNames to be printed.
Fixes#33094Fixes#23069
Change-Id: Id9829c20968e16db7194549f69c0eb5985044944
Reviewed-on: https://go-review.googlesource.com/c/go/+/229864
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Once the symbol is compressed, we will not need the uncompressed
symbol content. Free its memory.
Linking cmd/compile,
name old live-B new live-B delta
Dwarfcompress_GC 42.7M ± 0% 37.9M ± 0% -11.31% (p=0.008 n=5+5)
Change-Id: Ib6cc73832946d158ff4f5b4f31be9c35ba7cf103
Reviewed-on: https://go-review.googlesource.com/c/go/+/230859
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
After LoadFull, we'll be using sym.Symbols mostly. We still need
the loader information for symbol index mappings and name
lookups, but not much else. Free some memory.
Linking cmd/compile,
name old time/op new time/op delta
Loadlibfull_GC 44.5M ± 0% 35.8M ± 0% -19.66% (p=0.008 n=5+5)
Archive_GC 46.4M ± 0% 37.6M ± 0% -18.89% (p=0.008 n=5+5)
Linking cmd/compile with external linking,
name old time/op new time/op delta
Loadlibfull_GC 82.5M ± 0% 57.4M ± 0% -30.41% (p=0.008 n=5+5)
Archive_GC 86.8M ± 0% 61.7M ± 0% -28.90% (p=0.008 n=5+5)
Change-Id: I6859d488172ef8968918b86de527fbfed6832ebf
Reviewed-on: https://go-review.googlesource.com/c/go/+/230300
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
When applying relocations, we need to resolve ABI aliases.
relocsym does that. Architecture-specific archreloc also needs to
do that. The old code doesn't do that since ABI aliases are
resolved in loadlibfull, or, in the old linker, in a much earlier
stage. We don't do this in the new linker, as we want to avoid
mutating relocations.
While here, move R_CONST and R_GOTOFF handling to generic code.
They appear on several architectures and the handling are same.
Should fix 386-clang and *bsd-386 builds.
Change-Id: I6681c94f0327555d6cf329d0a518c88848773671
Reviewed-on: https://go-review.googlesource.com/c/go/+/230857
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Remove 'Sub' field from sym.Symbol, replacing uses (those downstream of
loadlibfull) with loader method calls.
NB: removing the Outer field will have to wait for now; it is accessed
in archreloc methods that don't have access to link ctxt or loader
currently.
Change-Id: I2abe5906fc169c64b2ab7d5ad213619bea5a17c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/230617
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This updates the PPC64.rules file to use the MOD instructions
that are available in power9. Prior to power9 this is done
using a longer sequence with multiply and divide.
Included in this change is removal of the REM* opcode variations
that set the CC or OV bits since their settings are based
on the DIV and are not appropriate for the REM.
Change-Id: Iceed9ce33e128e1911c15592ee674276ce8ba3fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/229761
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Prior to this commit, NewXxx could panic when passed an image.Rectangle
with one of width or height being negative. But it might not panic if
both were negative, because (bpp * w * h) could still be positive. After
this commit, it will panic if both are negative.
With overflow, NewXxx might not have panicked if (bpp * w * h), the
length passed to "make([]uint8, length)", was still non-negative (after
truncation), but even if w and h were valid (non-negative), the overall
byte slice wasn't long enough. Iterating over the pixels would possibly
panic later with index out of bounds. This change moves the panic
earlier, closer to where the mistake is.
Change-Id: I011feb2d53515fc3f0fe72bb6c23b3953772c577
Reviewed-on: https://go-review.googlesource.com/c/go/+/230220
Reviewed-by: Rob Pike <r@golang.org>
Convert some optimizations rules to strongly-typed versions. Similar to
CL 230338, this CL only converts rules that need no additional changes
(i.e: only need to change '->' to '=>').
This CL covers the rules from line 800 - 1219.
Passes toolstash-check
Change-Id: I94181a809fa38918b78301f1c0c680b7a8ab552f
Reviewed-on: https://go-review.googlesource.com/c/go/+/230738
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Previously, looking up only IPv4 or IPv6 addresses was only possible
with DefaultResolver via ResolveIPAddr. Add this functionality to the
Resolver type with a new method, LookupIP. This largely brings Resolver
functionally to parity with the global functions. The name LookupIP is
used over ResolveIPAddr to be consistent with the other Resolver
methods.
There are two main benefits to (*Resolver).LookupIP over
(*Resolver).LookupHost. First is an ergonomic benefit. Wanting a
specific family of address is common enough to justify a method, evident
by the existence of ResolveIPAddr. Second, this opens the possibility of
not performing unnecessary DNS requests when only a specific family of
addresses are needed. This optimization is left to follow up work.
Updates #30452
Change-Id: I241f61019588022a39738f8920b0ddba900cecdd
Reviewed-on: https://go-review.googlesource.com/c/go/+/228641
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Allocate the runcases slice on the stack if the number
of select cases is small (up to 4).
Found while looking at production profiles of common
proto based RPC server framework code in Google which do
not have a large number of cases.
name old time/op new time/op delta
Select/1 147ns ± 2% 120ns ± 6% -18.32% (p=0.000 n=7+10)
Select/4 316ns ± 5% 249ns ± 2% -21.23% (p=0.000 n=10+10)
Select/8 516ns ± 3% 515ns ± 3% ~ (p=0.858 n=10+9)
name old alloc/op new alloc/op delta
Select/1 96.0B ± 0% 64.0B ± 0% -33.33% (p=0.000 n=10+10)
Select/4 336B ± 0% 208B ± 0% -38.10% (p=0.000 n=10+10)
Select/8 672B ± 0% 672B ± 0% ~ (all equal)
name old allocs/op new allocs/op delta
Select/1 4.00 ± 0% 3.00 ± 0% -25.00% (p=0.000 n=10+10)
Select/4 7.00 ± 0% 6.00 ± 0% -14.29% (p=0.000 n=10+10)
Select/8 11.0 ± 0% 11.0 ± 0% ~ (all equal)
Change-Id: I1687e74fc8e86606a27f03fa8a561bcfb68775d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/230657
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Opening a connection with Connect should still create a derived
context with a timeout because some clients will not use a timeout
and the connection pool may open a connection asynchronously.
Likewise, if a connection close makes a network operation it should
provide some type of sane timeout for the operation.
Fixes#38185
Change-Id: I9b7ce2996c81c486170dcc84b12672a99610fa27
Reviewed-on: https://go-review.googlesource.com/c/go/+/230438
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Remove the "ElfSym" and "LocalElfSym" fields from sym.Symbol,
replacing uses with loader method calls as needed.
Change-Id: I3828f13203ece2bdc03eeb09ab37a5c94e21a726
Reviewed-on: https://go-review.googlesource.com/c/go/+/230462
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Add new get/set methods to the loader for recording the ELF symbol
index for a given loader symbol. These are map-based, since it is
expected that many/most symbols will not need an ELF symbol table
entry.
Change-Id: I1102c3637775515ccc6650118e8b059468a2c3ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/230461
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Remove the 'Gotype' field from sym.Symbol, as it is now no longer
used. Store the loader.Sym for a symbol as a field in sym.Symbol
("SymIdx"). Then remove sym.Symbol 'File' field, and replace the field
accesses in question with calls into the loader instead.
Change-Id: I01c5504425006b8d3fe77fac2b69a86e198c7a5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230304
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The span set data structure may leak blocks due to a race in the logic
to check whether it's safe to free a block. The simplest example of this
race is between two poppers:
1. Popper A claims slot spanSetEntries-2.
2. Popper B claims slot spanSetEntries-1.
3. Popper A gets descheduled before it subtracts from block.used.
4. Popper B subtracts from block.used, sees that claimed
spanSetEntries-1, but also that block.used != 0, so it returns.
5. Popper A comes back and subtracts from block.used, but it didn't
claim spanSetEntries-1 so it also returns.
The spine is left with a stale block pointer and the block later gets
overwritten by pushes, never to be re-used again.
The problem here is that we designate the claimer of slot
spanSetEntries-1 to be the one who frees the block, but that may not be
the thread that actually does the last subtraction from block.used.
Fixing this problem is tricky, and the fundamental problem there is that
block.used is not stable: it may be observed to be zero, but that
doesn't necessarily mean you're the last popper!
Do something simpler: keep a counter of how many pops have happened to a
given block instead of block.used. This counter monotonically increases
when a pop is _completely done_. Because this counter is monotonically
increasing, and only increases when a popper is done, then we know for
sure whichever popper is the last to increase it (i.e. its value is
spanSetBlockEntries) is also the last popper in the block. Because the
race described above still exists, the last popper may not be the one
which claimed the last slot in the block, but we know for certain nobody
else is popping from that block anymore so we can safely free it.
Finally, because pops serialize with pushes to the same slot, we need
not worry about concurrent pushers at all.
Updates #37487.
Change-Id: I6697219372774c8ca7d8ee6895eaa230a64ce9e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/230497
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Make Wasm more like other architectures, writing data sections to
heap in Asmb instead of Asmb2. Then we can remove the
copy-on-write logic in applying relocations.
Change-Id: I26d5315ea9fba032fe4bdb9b5c7fe483611c4373
Reviewed-on: https://go-review.googlesource.com/c/go/+/230465
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently mcaches are flushed to mcentral after a bunch of memstats have
already been read. This is not safe (in the sense that it doesn't ensure
consisent memstats) since memstats may in general change when mcentral
data structures are manipulated.
Note that prior to the new mcentral implementation this was not a
problem because mcentral operations happened to never modify certain
memstats. As of the new mcentral implementation, we might for example
persistentalloc when uncaching a span, which would change memstats. This
can cause a skew between the value of sys (which currently is calculated
before mcaches are flushed) and the value of gc_sys and other_sys.
Fix this by moving mcache flushing to the very top of updatememstats.
Also leave a comment explaining that this must be done first, in
general, because mcentrals make no guarantee that they will not
influence memstats (and doing so would be unnecessarily restrictive).
Fixes#38712.
Change-Id: I15bacb313c54a46e380a945a71bb75db67169c1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/230498
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This is a second attempt at CL 230024, with
cmd/go/testdata/script/mod_retention.txt updated to perform a
version-independent comparison on the 'go' version added to a go.mod
file that lacks one.
Fixes#38708
Change-Id: I15dcd83b51ed5ec57946b419bcbaec41e85a46f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/230382
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Convert some optimizations rules to strongly-typed versions. So far, I
have only converted the rules that need no additional changes (i.e: only
need to change '->' to "=>").
This CL covers the rules from line 478 - line 800 in S390X.rules file.
Some compare and branch rules also fall in this range, but they were
already done previously in another CL.
Passes toolstash-check.
Change-Id: I9167c5f1a32f4fd6c29bacc13fff95e83b0533e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/230338
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The compiler has better error messages for methods called without a
pointer receiver when one is expected. This change is similar to
CL 229801, but for method calls.
Also, added better error messages for functions called with the wrong
capitalization. I left the third TODO in this switch statement almost
as-is because I'm not sure that the extra complexity is worth it -
I adjusted the error to look like the one the compiler reports.
Fixesgolang/go#38658
Change-Id: Ie0ca2503e12f3659f112f0135cc27db1b027fdcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/230380
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Linux 4.5 introduced (and Linux 5.3 refined) the copy_file_range
system call, which allows file systems the opportunity to implement
copy acceleration techniques. This commit adds support for
copy_file_range(2) to the os package.
Introduce a new ReadFrom method on *os.File, which makes *os.File
implement the io.ReaderFrom interface. If dst and src are both files,
this enables io.Copy(dst, src) to call dst.ReadFrom(src), which, in
turn, will call copy_file_range(2) if possible. If copy_file_range(2)
is not supported by the host kernel, or if either of dst or src
refers to a non-regular file, ReadFrom falls back to the regular
io.Copy code path.
Add internal/poll.CopyFileRange, which acquires locks on the
appropriate poll.FDs and performs the actual work, as well as
internal/syscall/unix.CopyFileRange, which wraps the copy_file_range
system call itself at the lowest level.
Rework file layout in internal/syscall/unix to accomodate the
additional system call numbers needed for copy_file_range.
Merge these definitions with the ones used by getrandom(2) into
sysnum_linux_$GOARCH.go files.
A note on additional optimizations: if dst and src both refer to pipes
in the invocation dst.ReadFrom(src), we could, in theory, use the
existing splice(2) code in package internal/poll to splice directly
from src to dst. Attempting this runs into trouble with the poller,
however. If we call splice(src, dst) and see EAGAIN, we cannot know
if it came from src not being ready for reading or dst not being
ready for writing. The write end of src and the read end of dst are
not under our control, so we cannot reliably use the poller to wait
for readiness. Therefore, it seems infeasible to use the new ReadFrom
method to splice between pipes directly. In conclusion, for now, the
only optimization enabled by the new ReadFrom method on *os.File is
the copy_file_range optimization.
Fixes#36817.
Change-Id: I696372639fa0cdf704e3f65414f7321fc7d30adb
Reviewed-on: https://go-review.googlesource.com/c/go/+/229101
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
IntSize is an untyped constant that does not need explicit conversion.
Annotating IntSize as an int and running github.com/mdempsky/unconvert
reveals these two cases.
Fixes#38682.
Change-Id: I014646b7457ddcde32474810153229dcf0c269c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/230306
Run-TryBot: Akhil Indurti <aindurti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Currently allocToCache assumes it can move the search address past the
block it allocated the cache from, which violates the property that
searchAddr should always point to mapped memory (i.e. memory represented
by pageAlloc.inUse).
This bug was already fixed once for pageAlloc.alloc in the Go 1.14
release via CL 216697, but that changed failed to take into account
allocToCache.
Fixes#38605.
Change-Id: Id08180aa10d19dc0f9f551a1d9e327a295560dff
Reviewed-on: https://go-review.googlesource.com/c/go/+/229577
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Originally, we use an assembly function that returns a boolean result to
tell whether the machine has vector facility or not. It is now no longer
needed when we can directly use cpu.S390X.HasVX variable. This CL
also removes the last occurence of hasVectorFacility function on s390x.
Change-Id: Id20cb746c21eacac5e13344b362e2d87adfe4317
Reviewed-on: https://go-review.googlesource.com/c/go/+/230337
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In dodata we overwrite symbol types to SDATA. Now we'll stop
doing that, so accept more symbol types here. This is basically
a list of all writeable types handled in dodata that could appear
in XCOFF.
Change-Id: Iee35369162f5acd59806a3f0e6c8d3682620067e
Reviewed-on: https://go-review.googlesource.com/c/go/+/230310
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Originally, we use an assembly function that returns a boolean result to
tell whether the machine has vector facility or not. It is now no longer
needed when we can directly use cpu.S390X.HasVX variable.
Change-Id: Ic1dae851982532bcfd9a9453416c112347f21d87
Reviewed-on: https://go-review.googlesource.com/c/go/+/230318
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Originally, we use an assembly function that returns a boolean result to
tell whether the machine has vector facility or not. It is now no longer
needed when we can directly use cpu.S390X.HasVX variable.
Change-Id: Ic3ffeb9e63238ef41406d97cdc42502145ddb454
Reviewed-on: https://go-review.googlesource.com/c/go/+/230319
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL allows the usage of KDSA instruction when it is available. The
instruction is designed to be resistant to side channel attacks and
offers performance improvement for ed25519.
Benchmarks:
name old time/op new time/op delta
Signing-8 120µs ±20% 62µs ±12% -48.40% (p=0.000 n=10+10)
Verification-8 325µs ±17% 69µs ±10% -78.80% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
Signing-8 448B ± 0% 0B -100.00% (p=0.000 n=10+10)
Verification-8 288B ± 0% 0B -100.00% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Signing-8 5.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
Verification-8 2.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10)
Change-Id: I0330ce83d807370b419ce638bc2cae4cb3c250dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/202578
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Currently, the small object sweeper will sweep until it finds a free
slot or there are no more spans of that size class to sweep. In dense
heaps, this can cause sweeping for a given size class to take
unbounded time, and gets worse with larger heaps.
This CL limits the small object sweeper to try at most 100 spans
before giving up and allocating a fresh span. Since it's already shown
that 100 spans are completely full at that point, the space overhead
of this fresh span is at most 1%.
This CL is based on an experimental CL by Austin Clements (CL 187817)
and is updated to be part of the mcentral implementation, gated by
go115NewMCentralImpl.
Updates #18155.
Change-Id: I37a72c2dcc61dd6f802d1d0eac3683e6642b6ef8
Reviewed-on: https://go-review.googlesource.com/c/go/+/229998
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Currently mcentral is implemented as a couple of linked lists of spans
protected by a lock. Unfortunately this design leads to significant lock
contention.
The span ownership model is also confusing and complicated. In-use spans
jump between being owned by multiple sources, generally some combination
of a gcSweepBuf, a concurrent sweeper, an mcentral or an mcache.
So first to address contention, this change replaces those linked lists
with gcSweepBufs which have an atomic fast path. Then, we change up the
ownership model: a span may be simultaneously owned only by an mcentral
and the page reclaimer. Otherwise, an mcentral (which now consists of
sweep bufs), a sweeper, or an mcache are the sole owners of a span at
any given time. This dramatically simplifies reasoning about span
ownership in the runtime.
As a result of this new ownership model, sweeping is now driven by
walking over the mcentrals rather than having its own global list of
spans. Because we no longer have a global list and we traditionally
haven't used the mcentrals for large object spans, we no longer have
anywhere to put large objects. So, this change also makes it so that we
keep large object spans in the appropriate mcentral lists.
In terms of the static lock ranking, we add the spanSet spine locks in
pretty much the same place as the mcentral locks, since they have the
potential to be manipulated both on the allocation and sweep paths, like
the mcentral locks.
This new implementation is turned on by default via a feature flag
called go115NewMCentralImpl.
Benchmark results for 1 KiB allocation throughput (5 runs each):
name \ MiB/s go113 go114 gotip gotip+this-patch
AllocKiB-1 1.71k ± 1% 1.68k ± 1% 1.59k ± 2% 1.71k ± 1%
AllocKiB-2 2.46k ± 1% 2.51k ± 1% 2.54k ± 1% 2.93k ± 1%
AllocKiB-4 4.27k ± 1% 4.41k ± 2% 4.33k ± 1% 5.01k ± 2%
AllocKiB-8 4.38k ± 3% 5.24k ± 1% 5.46k ± 1% 8.23k ± 1%
AllocKiB-12 4.38k ± 3% 4.49k ± 1% 5.10k ± 1% 10.04k ± 0%
AllocKiB-16 4.31k ± 1% 4.14k ± 3% 4.22k ± 0% 10.42k ± 0%
AllocKiB-20 4.26k ± 1% 3.98k ± 1% 4.09k ± 1% 10.46k ± 3%
AllocKiB-24 4.20k ± 1% 3.97k ± 1% 4.06k ± 1% 10.74k ± 1%
AllocKiB-28 4.15k ± 0% 4.00k ± 0% 4.20k ± 0% 10.76k ± 1%
Fixes#37487.
Change-Id: I92d47355acacf9af2c41bf080c08a8c1638ba210
Reviewed-on: https://go-review.googlesource.com/c/go/+/221182
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This change implements the spanSet data structure which is based off of
the gcSweepBuf data structure. While the general idea is the same (one
has two of these which one switches between every GC cycle; one to push
to and one to pop from), there are some key differences.
Firstly, we never have a need to iterate over this data structure so
delete numBlocks and block. Secondly, we want to be able to pop from the
front of the structure concurrently with pushes to the back. As a result
we need to maintain both a head and a tail and this change introduces an
atomic headTail structure similar to the one used by sync.Pool. It also
implements popfirst in a similar way.
As a result of this headTail, we need to be able to explicitly reset the
length, head, and tail when it goes empty at the end of sweep
termination, so add a reset method.
Updates #37487.
Change-Id: I5b8ad290ec32d591e3c8c05e496c5627018074f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/221181
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This change adds a global pool of spanSetBlocks to the spanSet data
structure and adds support for eagerly freeing these blocks back to the
pool if the block goes empty.
This change prepares us to use this data structure in more places in the
runtime by allowing reuse of spanSetBlock.
Updates #37487.
Change-Id: I0752226e3667a9e3e1d87c9b66edaedeae1ac23f
Reviewed-on: https://go-review.googlesource.com/c/go/+/221180
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This change copies the gcSweepBuf data structure into a new file and
renames it spanSet. It will serve as the basis for a heavily modified
version of the gcSweepBuf data structure for the new mcentral
implementation.
We move it into a separate file now for two reasons:
1. We will need both implementations as they will coexist simultaneously
for a time.
2. By creating it now in a new change it'll make future changes which
modify it easier to review (rather than introducing the new file then).
Updates #37487.
Change-Id: If80603cab6e813a1ee2e5ecd49dcde5d8045a6c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/221179
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Implement multi-control branches for riscv64, switching to using the BNEZ
pseudo-instruction when rewriting conditionals. This will allow for further
branch optimisations to later be performed via rewrites.
Change-Id: I7f2c69f3c77494b403f26058c6bc8432d8070ad0
Reviewed-on: https://go-review.googlesource.com/c/go/+/226399
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
type T [3]string
Prior to this change, we generated this equality alg for T:
func eqT(p, q *T) (r bool) {
for i := range *p {
if len(p[i]) == len(q[i]) {
} else {
return
}
}
for j := range *p {
if runtime.memeq(p[j].ptr, q[j].ptr, len(p[j])) {
} else {
return
}
}
return true
}
That first loop can be profitably eliminated;
it's cheaper to spell out 3 length equality checks.
We now generate:
func eqT(p, q *T) (r bool) {
if len(p[0]) == len(q[0]) &&
len(p[1]) == len(q[1]) &&
len(p[2]) == len(q[2]) {
} else {
return
}
for i := 0; i < len(p); i++ {
if runtime.memeq(p[j].ptr, q[j].ptr, len(p[j])) {
} else {
return
}
}
return true
}
We now also eliminate loops for small float arrays as well,
and for any array of size 1.
These cutoffs were selected to minimize code size on amd64
at this moment, for lack of a more compelling methodology.
Any smallish number would do.
The switch from range loops to plain for loops allowed me
to use a temp instead of a named var, which eliminated
a pointless argument to checkAll.
The code to construct them is also a bit clearer, in my opinion.
Change-Id: I1bdd8ee4a2739d00806e66b17a4e76b46e71231a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230210
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Add linux/{ppc64,ppc64le} and aix/ppc64 arch support for the new
dodata() phase.
This completes the picture in terms of architecture support for the
new dodata(), but to be safe this patch leaves the command line flag
in place there are problems on the builders (especially given that we
have a dead aix-ppc64 builder).
Change-Id: I78da615c3b540d8925ed7b3226e199280eb7451d
Reviewed-on: https://go-review.googlesource.com/c/go/+/229983
Reviewed-by: Cherry Zhang <cherryyz@google.com>
type T [8]string
Prior to this change, we generated this equality algorithm for T:
func eqT(p, q *T) (r bool) {
for i := range *p {
if p[i] == q[i] {
} else {
return
}
}
return true
}
This change splits this into two loops, so that we can do the
cheap (length) half early and only then do the expensive (contents) half.
We now generate:
func eqT(p, q *T) (r bool) {
for i := range *p {
if len(p[i]) == len(q[i]) {
} else {
return
}
}
for j := range *p {
if runtime.memeq(p[j].ptr, q[j].ptr, len(p[j])) {
} else {
return
}
}
return true
}
The generated code is typically ~17% larger because it contains
two loops instead of one. In the future, we might want to unroll
the first loop when the array is small.
Change-Id: I26b2793b90ec6aff21766a411b15a4ff1096c03f
Reviewed-on: https://go-review.googlesource.com/c/go/+/230209
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
type T [8]interface{}
Prior to this change, we generated this equality algorithm for T:
func eqT(p, q *T) bool {
for i := range *p {
if p[i] != q[i] {
return false
}
}
return true
}
This change splits this into two loops, so that we can do the
cheap (type) half early and only then do the expensive (data) half.
We now generate:
func eqT(p, q *T) (r bool) {
for i := range *p {
if p[i].type == q[i].type {
} else {
return
}
}
for j := range *p {
if runtime.efaceeq(p[j].type, p[j].data, q[j].data) {
} else {
return
}
}
return true
}
The use of a named return value and a bare return is to work
around some typechecking problems that stymied me.
The structure of using equals and else (instead of not equals and then)
was for implementation convenience and clarity. As a bonus,
it generates slightly shorter code on AMD64, because zeroing a register
to return is cheaper than writing $1 to it.
The generated code is typically ~17% larger because it contains
two loops instead of one. In the future, we might want to unroll
the first loop when the array is small.
Change-Id: I5b2c8dd3384852f085c4f3e1f6ad20bc5ae59062
Reviewed-on: https://go-review.googlesource.com/c/go/+/230208
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
type T struct {
s interface{}
i int
}
Prior to this change, we generated this equality algorithm for T:
func eqT(p, q *T) bool {
return p.s.type == q.s.type &&
runtime.efaceeq(p.s.type, p.s.data, q.s.data) &&
p.i == q.i
}
This change splits the two halves of the interface equality,
so that we can do the cheap (type) half early and the expensive
(data) half late. We now generate:
func eqT(p, q *T) bool {
return p.s.type == q.s.type &&
p.i == q.i &&
runtime.efaceeq(p.s.type, p.s.data, q.s.data)
}
The generated code tends to be a bit smaller. Examples:
go/ast
.eq."".ForStmt 306 -> 304 (-0.65%)
.eq."".TypeAssertExpr 221 -> 219 (-0.90%)
.eq."".TypeSwitchStmt 228 -> 226 (-0.88%)
.eq."".ParenExpr 150 -> 148 (-1.33%)
.eq."".IndexExpr 221 -> 219 (-0.90%)
.eq."".SwitchStmt 228 -> 226 (-0.88%)
.eq."".RangeStmt 334 -> 332 (-0.60%)
Change-Id: Iec9e24f214ca772416202b9fb9252e625c22380e
Reviewed-on: https://go-review.googlesource.com/c/go/+/230207
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
type T struct {
s string
i int
}
Prior to this change, we generated this equality algorithm for T:
func eqT(p, q *T) bool {
return len(p.s) == len(q.s) &&
runtime.memequal(p.s.ptr, q.s.ptr, len(p.s)) &&
p.i == q.i
}
This change splits the two halves of the string equality,
so that we can do the cheap (length) half early and the expensive
(contents) half late. We now generate:
func eqT(p, q *T) bool {
return len(p.s) == len(q.s) &&
p.i == q.i &&
runtime.memequal(p.s.ptr, q.s.ptr, len(p.s))
}
The generated code for these functions tends to be a bit shorter. Examples:
runtime
.eq."".Frame 274 -> 272 (-0.73%)
.eq."".funcinl 249 -> 247 (-0.80%)
.eq."".modulehash 207 -> 205 (-0.97%)
Change-Id: I4efac9f7d410f0a11a94dcee2bf9c0b49b60e301
Reviewed-on: https://go-review.googlesource.com/c/go/+/230205
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
We only generate if statements via CondBreak, which is nice as the
control flow is simple and easy to work with. It seems like the If type
was added but never used, so remove it to avoid confusion.
We had a TODO about replacing CondBreak with If instead. I gave that a
try, but it doesn't seem worth the effort. The code gets more complex
and we don't really win anything in return.
While at it, don't use op strings as format strings in exprf. This
doesn't cause any issue at the moment, but it's best to be explicit
about the operator not containing any formatting verbs.
Change-Id: Ib59ad72d3628bf91594efc609e222232ad1e8748
Reviewed-on: https://go-review.googlesource.com/c/go/+/230257
Reviewed-by: Keith Randall <khr@golang.org>
The ReadOnly attribute was used to do copy on write when applying
relocations to symbols with read-only backing stores. Now that we
always apply relocations in the output buffer (mmap or heap), it
is always writeable. No need to tamper with the ReadOnly
attribute anymore.
Wasm is an exception, where we don't copy symbol contents to the
output buffer first. Do copy-on-write there.
This is in preparation of converting reloc to using the loader.
Change-Id: I15e53b7c162b9124e6689dfd8eb45cbe2ffd7153
Reviewed-on: https://go-review.googlesource.com/c/go/+/229991
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently, we run Asmb before reloc, except on Wasm, where the
order is reversed. However, Asmb is no-op on Wasm. So we can
always run Asmb first.
Change-Id: Ifb8989d8150ebdd5777deb05cbccec16f8e36d82
Reviewed-on: https://go-review.googlesource.com/c/go/+/229990
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The symbol alignment is set based on its size. In dynreloc2
symbol size may change (e.g. elfdynhash2). So the alignment must
be set after dynreloc2.
Noticed this while debugging nondeterministic build on Solaris.
Idx Name Size VMA LMA File off Algn
8 .hash 000000c8 000000000048add2 000000000048add2 0008add2 2**3
CONTENTS, ALLOC, LOAD, READONLY, DATA
This doesn't look right, as the section address is not a multiple
of its alignment.
Change-Id: I23534cbc59695b7bc241838173fcc71dde95b195
Reviewed-on: https://go-review.googlesource.com/c/go/+/230278
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Apply strong aux typing to lowering rules that do not require
modification beyond substituting -> for =>. Other lowering rules
and all the optimization rules will follow. I'm breaking it up
to allow toolstash-check to pass on the big CLs.
Passes toolstash-check -all.
Change-Id: I6f1340058a8eb5a1390411e59fcbea9d7f777e58
Reviewed-on: https://go-review.googlesource.com/c/go/+/229400
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The commuteDepth variable is no longer necessary; remove it.
Else branches after a log.Fatal call are unnecessary.
Also make the unbalanced return an integer, so we can differentiate
positive from negative cases. We only want to continue a rule with the
following lines if this balance is positive, for example.
While at it, make the balance loop stop when it goes negative, to not
let ")(" seem balanced.
Change-Id: I8aa313343ca5a2f07f638b62a0398fdf108fc9eb
Reviewed-on: https://go-review.googlesource.com/c/go/+/228822
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Ensures that a canceled client request for Switching Protocols
(e.g. h2c, Websockets) will cause the underlying connection to
be terminated.
Adds a goroutine in handleUpgradeResponse in order to select on
the incoming client request's context and appropriately cancel it.
Fixes#35559
Change-Id: I1238e18fd4cce457f034f78d9cdce0e7f93b8bf6
GitHub-Last-Rev: 3629c78493
GitHub-Pull-Request: golang/go#38021
Reviewed-on: https://go-review.googlesource.com/c/go/+/224897
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
If an I/O operation fails because a deadline was exceeded,
return os.ErrDeadlineExceeded. We used to return poll.ErrTimeout,
an internal error, and told users to check the Timeout method.
However, there are other errors with a Timeout method that returns true,
notably syscall.ETIMEDOUT which is returned for a keep-alive timeout.
Checking errors.Is(err, os.ErrDeadlineExceeded) should permit code
to reliably tell why it failed.
This change does not affect the handling of net.Dialer.Deadline,
nor does it change the handling of net.DialContext when the context
deadline is exceeded. Those cases continue to return an error
reported as "i/o timeout" for which Timeout is true, but that error
is not os.ErrDeadlineExceeded.
Fixes#31449
Change-Id: I0323f42e944324c6f2578f00c3ac90c24fe81177
Reviewed-on: https://go-review.googlesource.com/c/go/+/228645
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
This triggers in 131 functions in std+cmd.
In those functions, it often helps considerably
(2-10% text size reduction).
Noticed while working on #38554.
Change-Id: Id0dbb8e7cb21d469ec08ec3d5be9beb9e8291e9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229707
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
We set up static symbols during walk that
we later make copies of to initialize local variables.
It is difficult to ascertain at that time exactly
when copying a symbol is profitable vs locally
initializing an autotmp.
During SSA, we are much better placed to optimize.
This change recognizes when we are copying from a
global readonly all-zero symbol and replaces it with
direct zeroing.
This often allows the all-zero symbol to be
deadcode eliminated at link time.
This is not ideal--it makes for large object files,
and longer link times--but it is the cleanest fix I could find.
This makes the final binary for the program in #38554
shrink from >500mb to ~2.2mb.
It also shrinks the standard binaries:
file before after Δ %
addr2line 4412496 4404304 -8192 -0.186%
buildid 2893816 2889720 -4096 -0.142%
cgo 4841048 4832856 -8192 -0.169%
compile 19926480 19922432 -4048 -0.020%
cover 5281816 5277720 -4096 -0.078%
link 6734648 6730552 -4096 -0.061%
nm 4366240 4358048 -8192 -0.188%
objdump 4755968 4747776 -8192 -0.172%
pprof 14653060 14612100 -40960 -0.280%
trace 11805940 11777268 -28672 -0.243%
vet 7185560 7181416 -4144 -0.058%
total 113588440 113465560 -122880 -0.108%
And not just by removing unnecessary symbols;
the program text shrinks a bit as well.
Fixes#38554
Change-Id: I8381ae6084ae145a5e0cd9410c451e52c0dc51c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/229704
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Package amd64 is a more natural home for it.
It also makes it easier to see how many bytes
are being copied in ssa.html.
Passes toolstash-check.
Change-Id: I5ecf0f0f18e8db2faa2caf7a05028c310952bd94
Reviewed-on: https://go-review.googlesource.com/c/go/+/229703
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
net/http/pprof: delta profile support
runtime/pprof: profile labels plumbing for goroutine profiles
Change-Id: I92e750dc894c8c6b3c3ba10f7be58bb541d3c289
Reviewed-on: https://go-review.googlesource.com/c/go/+/230023
Reviewed-by: Ian Lance Taylor <iant@golang.org>
These comparisons are fairly arbitrary,
but they should be more stable in the face
of other compiler changes than value ID.
This reduces the number of value ID
comparisons in schedule while running
make.bash from 542,442 to 99,703.
There are lots of changes to generated code
from this change, but they appear to
be overall neutral.
It is possible to further reduce the
number of comparisons in schedule;
I have changes locally that reduce the
number to about 25,000 during make.bash.
However, the changes are increasingly
complex and arcane, and reduce in much less
code churn. Given that the goal is stability,
that suggests that this is a reasonable
place to stop, at least for now.
Change-Id: Ie3a75f84fd3f3fdb102fcd0b29299950ea66b827
Reviewed-on: https://go-review.googlesource.com/c/go/+/229799
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Falling back to comparing Value.ID during scheduling
is undesirable: Not only are we simply hoping for a good
outcome, but the decision we make will be easily perturbed
by other compiler changes, leading to random fluctuations.
This change adds another decision point to the scheduler
by scheduling Values with many uses earlier.
Values with fewer uses are less likely to be spilled for
other reasons, so we should issue them as late as possible
in the hope of avoiding a spill.
This reduces the number of Value ID comparisons
in schedule while running make.bash
from 1,000,844 to 542,442.
As you would expect, this changes a lot of functions,
but the overall trend is positive:
file before after Δ %
api 5237184 5233088 -4096 -0.078%
compile 19926480 19918288 -8192 -0.041%
cover 5281816 5277720 -4096 -0.078%
dist 3711608 3707512 -4096 -0.110%
total 113588440 113567960 -20480 -0.018%
Change-Id: Ic99ebc4c614d4ae3807ce44473ec6b04684388ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/229798
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The compiler produces high quality error messages when an interface is
implemented by *T, rather than T. This change improves the analogous
error messages in go/types, from "missing method X" to "missing method
X (X has pointer receiver)".
I am open to improving this message further - I didn't copy the compiler
error message exactly because, at one of the call sites of
(*check).missingMethod, we no longer have access to the name of the
interface.
Fixesgolang/go#36336
Change-Id: Ic4fc38b13fff9e5d9a69cc750c21e0b0c34d85a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/229801
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Previous CL introduced index fingerprint in the object files.
This CL implements the second part: checking fingerprint
consistency in the linker when packages are loaded.
Change-Id: I05dd4c4045a65adfd95e77b625d6c75a7a70e4f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/229618
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The new object files use indices for symbol references, instead
of names. Fundamental to the design, it requires that the
importing and imported packages have consistent view of symbol
indices. The Go command should already ensure this, when using
"go build". But in case it goes wrong, it could lead to obscure
errors like run-time crashes. It would be better to check the
index consistency at build time.
To do that, we add a fingerprint to each object file, which is
a hash of symbol indices. In the object file it records the
fingerprints of all imported packages, as well as its own
fingerprint. At link time, the linker checks that a package's
fingerprint matches the fingerprint recorded in the importing
packages, and issue an error if they don't match.
This CL does the first part: introducing the fingerprint in the
object file, and propagating fingerprints through
importing/exporting by the compiler. It is not yet used by the
linker. Next CL will do.
Change-Id: I0aa372da652e4afb11f2867cb71689a3e3f9966e
Reviewed-on: https://go-review.googlesource.com/c/go/+/229617
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
In the code there are conditions like !ctxt.IsDarwin(). This will
accidentally be true if HeadType is not yet set. Panic when
HeadType is not set, to catch errors.
Change-Id: Ic891123f27f0276fff5a4b5d29e5b1f7ebbb94ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/229869
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
So we can use it to set per-OS flags.
Also set flagnewDoData after archinit, where IsELF is set.
This should correct the logic of setting flagnewDoData.
Change-Id: I18c7252f141aa35119005c252becc9d7cb74f2f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/229867
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Keep track of all expressions encountered while
generating a rewrite result, and re-use them whenever possible.
Named expressions may still be used for clarity when desired.
Change-Id: I640dca108763eb8baeff8f9a4169300af3445b82
Reviewed-on: https://go-review.googlesource.com/c/go/+/229800
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
In the dev.link branch we continued developing the new object
file format support and the linker improvements described in
https://golang.org/s/better-linker . Since the last merge, more
progress has been made to improve the new linker.
This is a clean merge.
Change-Id: I57c510b651a39354d78478a9a4499f770eef2eb1
This patch begins the work of converting the linker's dodata phase to
work with loader APIs. Passes all.bash on linux/amd64, but hasn't been
tested on anything else (more arch-specific code needs to be written).
Use of the new dodata() phase is currently gated by a temporary
command line flag ("-newdodata"), and there is code in the linker's
main routine to insure that we only use the new version for the right
GOOS/GOARCH (currently restricted to ELF + AMD64).
Change-Id: Ied3966677d2a450bc3e0990e0f519b3fceaab806
Reviewed-on: https://go-review.googlesource.com/c/go/+/229706
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Move the guts of ctxt.Errorf into loader.Loader, so that we can make
calls to it from functions that have a "*loader.Loader" available but
not a "ctxt *Link". This is needed to start converting hooks like
"adddynrel" in the arch-specific portions of the linker to use loader
APIs.
Change-Id: Ieedd4583b66504be0e77d7f3fbadafe0d2307a69
Reviewed-on: https://go-review.googlesource.com/c/go/+/229497
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Clients may need to invoke the loader.Reloc2.SetType method to reset
the type of a relocation from external flavor to internal flavor,
meaning that the external type add-in needs to be zeroed (this is
needed when adding dynsym entries).
Add a new SymbolBuider method to support mutating the type of a reloc
for an external symbol, so that the external type can be changed as
well (Reloc2 doesn't have access to that). Also add similar methods
for updating target symbol and addend, so as to have a consistent
interface for ext reloc mutation.
Change-Id: I8e26cdae0a0f353019acba5f9c8a0506e3970266
Reviewed-on: https://go-review.googlesource.com/c/go/+/229604
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Allow for the possibility that a client could call newExtSym(), then
ask for the section of the new sym before SetSectSym is called on it
(check in SymSect for this case).
Change-Id: I7bd78e7b3b7618943705b616f62ea78c4a1b68d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229603
Reviewed-by: Jeremy Faller <jeremy@golang.org>
On darwin/arm64, the copy of the system roots takes 256 KiB of disk
and 560 KiB of memory after parsing them (which is retained forever in
a package global by x509/root.go). In constrained environments like
iOS NetworkExtensions where total disk+RAM is capped at 15 MiB, these
certs take 5.3% of the total allowed memory.
It turns out you can get down from 816 KiB to 110 KiB by instead
storing compressed x509 certs in the binary and lazily inflating just
the needed certs at runtime as a function of the certs presented to
you by the server, then building a custom root CertPool in the
crypto/tls.Config.VerifyPeerCertificate hook.
This then saves 706 KiB.
Arguably that should be the default Go behavior, but involves
cooperation between x509 and tls, and adds a dependency to
compress/gzip. Also, it may not be the right trade-off for everybody,
as it involves burning more CPU on new TLS connections. Most iOS apps
don't run in a NetworkExtension context limiting them to 15 MiB.
The build tag is chosen to match the existing "nethttpomithttp2".
Change-Id: I7b1c845de08b22674f81dd546e7fadc7dda68bd7
Reviewed-on: https://go-review.googlesource.com/c/go/+/229762
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Fix regression where line numbers in the sources column of generated
ssa.html output became misaligned with the source code. This was due
to some new margins applied to certain h2 elements during the work
to combine identical columns.
Fixes#38612
Change-Id: I067ccbfa30d5de5be29aab9863bc1e21f6ded128
Reviewed-on: https://go-review.googlesource.com/c/go/+/229766
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This allows more exciting changes to compiler-generated assembly
language that might not be correct for tricky hand-crafted
assembly (e.g., nop padding breaking tables of call or branch
instructions).
Updates #35881
Change-Id: I842b811796076c160180a364564f2844604df3fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/229708
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This CL uses fixVariadicCall before escape analyzing function calls.
This has a number of benefits, though also some minor obstacles:
Most notably, it allows us to remove ODDDARG along with the logic
involved in setting it up, manipulating EscHoles, and later copying
its escape analysis flags to the actual slice argument. Instead, we
uniformly handle all variadic calls the same way. (E.g., issue31573.go
is updated because now f() and f(nil...) are handled identically.)
It also allows us to simplify handling of builtins and generic
function calls. Previously handling of calls was hairy enough to
require multiple dispatches on n.Op, whereas now the logic is uniform
enough that we can easily handle it with a single dispatch.
The downside is handling //go:uintptrescapes is now somewhat clumsy.
(It used to be clumsy, but it still is, too.) The proper fix here is
probably to stop using escape analysis tags for //go:uintptrescapes
and unsafe-uintptr, and have an earlier pass responsible for them.
Finally, note that while we now call fixVariadicCall in Escape, we
still have to call it in Order, because we don't (yet) run Escape on
all compiler-generated functions. In particular, the generated "init"
function for initializing package-level variables can contain calls to
variadic functions and isn't escape analyzed.
Passes toolstash-check -race.
Change-Id: I4cdb92a393ac487910aeee58a5cb8c1500eef881
Reviewed-on: https://go-review.googlesource.com/c/go/+/229759
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL adds a UsesCgo config setting to go/types to specify that the
_cgo_gotypes.go file generated by cmd/cgo has been provided as a
source file. The type checker then internally resolves C.bar qualified
identifiers to _Cfoo_bar as appropriate.
It also adds support to srcimporter to automatically run cgo.
Unfortunately, this functionality is not compatible with overriding
OpenFile, because cmd/cgo and gcc will directly open files.
Updates #16623.
Updates #35721.
Change-Id: I1e1965fe41b765b7a9da3431f2a86cc16025dee2
Reviewed-on: https://go-review.googlesource.com/c/go/+/33677
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Fix a longstanding TODO.
Provides widespread, minor improvements.
Negligible compiler cost.
Because the freeze nears, put in a safety flag to easily disable.
Change-Id: I338812181ab6d806fecf22afd3c3502e2c94f7a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229600
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Provides minor widespread benefit to generated code.
Removes one source of random fluctuation when changing
other aspects of the compiler.
Change-Id: I16db6f5e240a97d27f05dc1ba5b8b729af3adb12
Reviewed-on: https://go-review.googlesource.com/c/go/+/229702
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This change adds some instructions that were missing from the
ppc64 assembler, mostly power9 but a few others from earlier.
Tests in cmd/asm for ppc64 were updated: ppc64.s includes the
new instructions, and ppc64enc.s now includes not only the
new instructions but most ppc64 opcodes to provide a more
complete test of the ppc64 assembler.
The ppc64 instruction set is used for linux/ppc64le,
linux/ppc64, and aix/ppc64.
Change-Id: I8695f89dbca06174847963f4ef869f2e584d5bbf
Reviewed-on: https://go-review.googlesource.com/c/go/+/229479
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Converted some Println() statements (used to make sure that certain variables were
kept alive and not optimized out) to assignments into global variables, so the
tests don't produce extraneous output when there is a failure.
Fixes#38594
Change-Id: I7eb41bb02b2b1e78afd7849676b5c85bc11c759c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229538
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This CL moves fixVariadicCall from mid-Walk of function calls to
early-Order, in preparation for moving it even earlier in the future.
Notably, rewriting variadic calls this early introduces two
compilation output changes:
1. Previously, Order visited the ODDDARG before the rest of the
arguments list, whereas the natural time to visit it is at the end of
the list (as we visit arguments left-to-right, and the ... argument is
the rightmost one). Changing this ordering permutes the autotmp
allocation order, which in turn permutes autotmp naming and stack
offsets.
2. Previously, Walk separately walked all of the variadic arguments
before walking the entire slice literal, whereas the more natural
thing to do is just walk the entire slice literal. This triggers
slightly different code paths for composite literal construction in
some cases.
Neither of these have semantic impact. They simply mean we're now
compiling f(a,b,c) the same way as we were already compiling
f([]T{a,b,c}...).
Change-Id: I40ccc5725697a116370111ebe746b2639562fe87
Reviewed-on: https://go-review.googlesource.com/c/go/+/229601
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Allow go generate to process packages that contain invalid code. Ignore
errors when loading the package, but process only files which have a
valid package clause. Set $GOPACKAGE individually for each file, based
on the package clause.
Add test script for go generate and invalid packages.
Fixes#36422
Change-Id: I91ea088346a1548ccd6678b4595a527b948331ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/229097
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In mid-Walk, we rewrite calls to variadic functions to use explicit
slice literals; e.g., rewriting f(a,b,c) into f([]T{a,b,c}...).
However, it would be useful to do that rewrite much earlier in the
compiler, so that other compiler passes can be simplified.
This CL refactors the rewrite logic into a new fixVariadicCall
function, which subsequent CLs can more easily move into earlier
compiler passes.
Passes toolstash-check -race.
Change-Id: I408e655f2d3aa00446a2e6accf8765abc3b16a8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/229486
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
ioutil.TempDir doesn't like path separators in its pattern. Modify
(*common).TempDir to replace path separators with underscores before
using the test name as a pattern for ioutil.TempDir.
Fixes#38465.
Change-Id: I9e8ae48b99648b2bf9f561762e845165aff01972
Reviewed-on: https://go-review.googlesource.com/c/go/+/229399
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
unsafe.Pointer safety rule #4 says "The compiler handles a Pointer
converted to a uintptr in the argument list of a call". Within escape
analysis, we've always required this be a single conversion
unsafe.Pointer->uintptr conversion, but the corresponding logic in
order is somewhat laxer, allowing arbitrary chains of OCONVNOPs from
unsafe.Pointer to uintptr.
This CL changes order to be stricter to match escape analysis.
Passes toolstash-check.
Change-Id: Iadd210d2123accb2020f5728ea2a47814f703352
Reviewed-on: https://go-review.googlesource.com/c/go/+/229578
Reviewed-by: Ian Lance Taylor <iant@golang.org>
With CL 228782, we've removed file I/O, but we're growing the memory too
much. This change will periodically flush the heap area to the mmapped
area (if possible).
Change-Id: I1622c738ee5a1a6d02bff5abb0a5751caf8095c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/229439
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
golang.org/cl/147598 added the support for delta computation for mutex
and block profiles. In fact, this delta computation makes sense for
other types of profiles.
For example, /debug/pprof/allocs?seconds=x will provide how much allocation
was made during the specified period. /debug/pprof/goroutine?seconds=x will
provide the changes in the list of goroutines. This also makes sense for
custom profiles.
Update #23401
Update google/pprof#526
Change-Id: I45e9073eb001ea5b3f3d16e5a57f635193610656
Reviewed-on: https://go-review.googlesource.com/c/go/+/229537
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
In some slow environment, the goroutine for mutexHog2 may not run
within 1secs. So, try with increasing seconds parameters,
and declare failure if it still fails with the longest duration
parameter (32sec).
Also, relax the test condition - previously we expected the
profile's duration is within 0.5~2sec. But obviously, in some
slow environment, that's not even guaranteed. Just check we get
non-zero duration in the result.
Update #38544
Change-Id: Ia9b0d51429a2093e6c9eb92cf463ff6952ef3e10
Reviewed-on: https://go-review.googlesource.com/c/go/+/229498
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This CL optimizes code that uses a carry from a function such as
bits.Add64 as the condition in an if statement. For example:
x, c := bits.Add64(a, b, 0)
if c != 0 {
panic("overflow")
}
Rather than converting the carry into a 0 or a 1 value and using
that as an input to a comparison instruction the carry flag is now
used as the input to a conditional branch directly. This typically
removes an ADD LOGICAL WITH CARRY instruction when user code is
doing overflow detection and is closer to the code that a user
would expect to generate.
Change-Id: I950431270955ab72f1b5c6db873b6abe769be0da
Reviewed-on: https://go-review.googlesource.com/c/go/+/219757
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The code that runs as a part of loadlibfull converts the linker's
outer/sub state and sets the sym.Symbol AttrSubSymbol if a symbol has
both A) an outer sym, and B) is listed as a sub-symbol by some other
symbol.
Make sure that we have the same logic in the original loader method,
since we need to use it as part of dodata() prior to loadlibfull.
Change-Id: I200adab741d778a6ba821419e8ea131ad19375bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/229440
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Change the timing for preprocessing of integer/floating point constant
symbols so that we populate them with content at an earlier stage.
This is needed to allow them can be picked up by the loader-API
version of dodata().
Change-Id: Icf09f4f4b318b4f77e11d4a0f0a9cbecd76a1d6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229438
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This covers most of the lowering rules.
Passes
GOARCH=mips gotip build -toolexec 'toolstash -cmp' -a std
GOARCH=mipsle gotip build -toolexec 'toolstash -cmp' -a std
Change-Id: I9d00aaebecb36622e3bdaf556e5a9377670bf86b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229102
Reviewed-by: Keith Randall <khr@golang.org>
Create a new version of the GCProg type + methods that use loader APIs
instead of sym.Symbol.
This code isn't actually used just yet, but will be needed once the
wavefront reaches dodata() and we need to convert that phase.
Change-Id: I087521832015818204fe5c2ac99c7bd3f61b2bf0
Reviewed-on: https://go-review.googlesource.com/c/go/+/229037
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Previously the connection pool would only count connections
expired in the background connectionCleaner goroutine towards the
MaxLifetimeClosed stat.
This change increments the stat correctly when checking for
expiry in when acquiring and releasing a connection.
Fixes#38058
Change-Id: Id707ddd40a42a4c38658d5f2931da131647d6c29
GitHub-Last-Rev: 0f205ede43
GitHub-Pull-Request: golang/go#38263
Reviewed-on: https://go-review.googlesource.com/c/go/+/227278
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Theophanes <kardianos@gmail.com>
Goroutines are directly associated with labels. It's relatively easy to
plumb those through without creating goroutine-locals in the wild.
This is accomplished by splitting out most of the code from the public
`runtime.GoroutineProfile` into a new unexported
`runtime.goroutineProfileWithLabels`, which then has a thin wrapper
linked into the `runtime/pprof` package as
`runtime_goroutineProfileWithLabels`. (mirroring the way labels get
associated with the `g` for a goroutine in the first place)
Per-#6104, OS-thread creation profiles are a bit useless, as `M`s tend
to be created be created by a background goroutine. As such, I decided
not to add support for capturing the labels at `M`-creation-time, since
the stack-traces seem to always come out `nil` for my simple test
binaries.
This change currently provides labels for debug=0 and debug=1, as
debug=2 is currently entirely generated by the runtime package and I
don't see a clean way of getting the `labelMap` type handled properly
within the `runtime` package.
Update the comment added in cl/131275 to mention goroutine support for
labels.
Updates #23458
Change-Id: Ia4b558893d7d10156b77121cd9b70c4ccd9e1889
Reviewed-on: https://go-review.googlesource.com/c/go/+/189318
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
With old object files, when objdump an object file which, for
example, contains a call of fmt.Fprintf, it shows a symbol
reference like
R_CALL:fmt.Fprintf
With new object files, as the symbol reference is indexed, the
reference becomes
R_CALL:fmt.#33
The object file does not contain information of what symbol #33
in the fmt package is.
To make this more useful, print the index when dumping the symbol
definitions. This way, when dumping the fmt package, e.g.
"go tool nm fmt.a", it will print
6c705 T fmt.Fprintf#33
So we can find out what symbol #33 actually is.
Change-Id: I320776597d28615ce18dd0617c352d2b8180db49
Reviewed-on: https://go-review.googlesource.com/c/go/+/229246
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Currently, we use a dense array to store symbol's sections. The
array element is a *sym.Section, which takes 8 bytes per symbol
on a 64-bit machine. And the array is created upfront.
To reduce memory usage, use a 16-bit index for sections, so we
store 2 bytes per symbol. The array is pointerless, reducing GC
work. Also create the array lazily.
This reduces some memory usage: linking cmd/compile,
name old alloc/op new alloc/op delta
Loadlib_GC 42.1MB ± 0% 36.2MB ± 0% -14.01% (p=0.008 n=5+5)
name old live-B new live-B delta
Loadlib_GC 16.8M ± 0% 15.4M ± 0% -8.36% (p=0.008 n=5+5)
Archive_GC 98.2M ± 0% 97.2M ± 0% -1.02% (p=0.008 n=5+5) # at the end
Change-Id: If8c41eded8859660bca648c5e6fdf5830810fbf6
Reviewed-on: https://go-review.googlesource.com/c/go/+/229306
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Originally on s390x, ADDE does not work when adding numbers from a memory location.
For example: ADDE (R3), R4 will result in a failure.
Since ADDC, ADD and ADDW already supports adding from memory location,
let's support that for ADDE as well.
Change-Id: I7cbe112ea154733a621b948c6a21bbee63fb0c62
Reviewed-on: https://go-review.googlesource.com/c/go/+/229304
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Clean up the code a little bit to make it clearer:
Don't check throwsplit for a SI_USER signal.
If throwsplit is set for a SigPanic signal, always throw;
discard any other flags.
Fixes#36420
Change-Id: Ic9dcd1108603d241f71c040504dfdc6e528f9767
Reviewed-on: https://go-review.googlesource.com/c/go/+/228900
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Currently markrootSpans, the scanning routine which scans span specials
(particularly finalizers) as roots, uses sweepSpans to shard work and
find spans to mark.
However, as part of a future CL to change span ownership and how
mcentral works, we want to avoid having markrootSpans use the sweep bufs
to find specials, so in this change we introduce a new mechanism.
Much like for the page reclaimer, we set up a per-page bitmap where the
first page for a span is marked if the span contains any specials, and
unmarked if it has no specials. This bitmap is updated by addspecial,
removespecial, and during sweeping.
markrootSpans then shards this bitmap into mark work and markers iterate
over the bitmap looking for spans with specials to mark. Unlike the page
reclaimer, we don't need to use the pageInUse bits because having a
special implies that a span is in-use.
While in terms of computational complexity this design is technically
worse, because it needs to iterate over the mapped heap, in practice
this iteration is very fast (we can skip over large swathes of the heap
very quickly) and we only look at spans that have any specials at all,
rather than having to touch each span.
This new implementation of markrootSpans is behind a feature flag called
go115NewMarkrootSpans.
Updates #37487.
Change-Id: I8ea07b6c11059f6d412fe419e0ab512d989377b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/221178
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Previously for a method value "x.M", we always flowed x directly to
the heap, which led to the receiver argument generally needing to be
heap allocated.
This CL changes it to flow x to the closure and M's receiver
parameter. This allows receiver arguments to be stack allocated as
long as (1) the closure never escapes, *and* (2) method doesn't leak
its receiver parameter.
Within the standard library, this allows a handful of objects to be
stack allocated instead. Listed here are diagnostics that were
previously emitted by "go build -gcflags=-m std cmd" that are no
longer emitted:
archive/tar/writer.go:118:6: moved to heap: f
archive/tar/writer.go:208:6: moved to heap: f
archive/tar/writer.go:248:6: moved to heap: f
cmd/compile/internal/gc/initorder.go:252:2: moved to heap: d
cmd/compile/internal/gc/initorder.go:75:2: moved to heap: s
cmd/go/internal/generate/generate.go:206:7: &Generator literal escapes to heap
cmd/internal/obj/arm64/asm7.go:910:2: moved to heap: c
cmd/internal/obj/mips/asm0.go:415:2: moved to heap: c
cmd/internal/obj/pcln.go:294:22: new(pcinlineState) escapes to heap
cmd/internal/obj/s390x/asmz.go:459:2: moved to heap: c
crypto/tls/handshake_server.go:56:2: moved to heap: hs
Thanks to Cuong Manh Le for help coming up with this solution.
Fixes#27557.
Change-Id: I8c85d671d07fb9b53e11d2dd05949a34dbbd7e17
Reviewed-on: https://go-review.googlesource.com/c/go/+/228263
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL refactors tagHole to handle all three call situations (unknown
function; known function in same analysis batch; known function in
previous analysis batch). This will make it somewhat easier to reuse
in a followup CL.
Passes toolstash-check.
Change-Id: I764d047a333dfc593d721a881361683e94b485df
Reviewed-on: https://go-review.googlesource.com/c/go/+/229059
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
During schedinit, these may occur in:
mProf_Malloc
stkbucket
newBucket
persistentalloc
persistentalloc1
mProf_Malloc
setprofilebucket
fixalloc.alloc
persistentalloc
persistentalloc1
These seem to be legitimate lock orderings.
Additionally, mheap.speciallock had a defined rank, but it was never
actually used. That is fixed now.
Updates #38474
Change-Id: I0f6e981852eac66dafb72159f426476509620a65
Reviewed-on: https://go-review.googlesource.com/c/go/+/228786
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
When generating code for unsigned equals (==) and not equals (!=)
comparisons we currently, on s390x, always use signed comparisons.
This mostly works well, however signed comparisons on s390x sign
extend their immediates and unsigned comparisons zero extend them.
For compare-and-branch instructions which can only have 8-bit
immediates this significantly changes the range of immediate values
we can represent: [-128, 127] for signed comparisons and [0, 255]
for unsigned comparisons.
When generating equals and not equals checks we don't neet to worry
about whether the comparison is signed or unsigned. This CL
therefore adds rules to allow us to switch signedness for such
comparisons if it means that it brings a constant into range for an
8-bit immediate.
For example, a signed equals with an integer in the range [128, 255]
will now be implemented using an unsigned compare-and-branch
instruction rather than separate compare and branch instructions.
As part of this change I've also added support for adding a name
to block control values using the same `x:(...)` syntax we use for
value rules.
Triggers 792 times when compiling cmd and std.
Change-Id: I77fa80a128f0a8ce51a2888d1e384bd5e9b61a77
Reviewed-on: https://go-review.googlesource.com/c/go/+/228642
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Use nlzX variants instead. While at it, also remove tests involve
nlz/nlo/nto/log2, since when we are calling directly "math/bits"
functions.
Passes toolstash-check.
Change-Id: I83899741a29e05bc2c19d73652961ac795001781
Reviewed-on: https://go-review.googlesource.com/c/go/+/229138
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
go/build.Import can return errors for many different reasons like
inconsistent package clauses or errors parsing build constraints.
It will still return a *build.Package with imports from files it was
able to process. Package.load should load these imports, even after an
unknown error.
There is already a special case for scanner.ErrorList (parse
error). This CL expands that behavior for all errors.
Fixes#38568
Change-Id: I871827299c556f1a9a5b12e7755b221e9d8c6e0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/229243
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Thie CL changes cmd/compile/internal/syntax to give the gc half of
the compiler more control over pragma handling, so that it can prepare
better errors, diagnose misuse, and so on. Before, the API between
the two was hard-coded as a uint16. Now it is an interface{}.
This should set us up better for future directives.
In addition to the split, this CL emits a "misplaced compiler directive"
error for any directive that is in a place where it has no effect.
I've certainly been confused in the past by adding comments
that were doing nothing and not realizing it. This should help
avoid that kind of confusion.
The rule, now applied consistently, is that a //go: directive
must appear on a line by itself immediately before the declaration
specifier it means to apply to. See cmd/compile/doc.go for
precise text and test/directive.go for examples.
This may cause some code to stop compiling, but that code
was broken. For example, this code formerly applied the
//go:noinline to f (not c) but now will fail to compile:
//go:noinline
const c = 1
func f() {}
Change-Id: Ieba9b8d90a27cfab25de79d2790a895cefe5296f
Reviewed-on: https://go-review.googlesource.com/c/go/+/228578
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Split out DWARF symbol-to-section assignment into its own separate
helper routine, to improve readability. No change in functionality.
Change-Id: Ic2e4f4d99afbff65161cbb8bd63e866ea555f322
Reviewed-on: https://go-review.googlesource.com/c/go/+/228957
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Additional cleanups and refactorings in the allocateSections portion
of dodata. Introduce some new helper routines to be used for common
cases in creating sections and assigning symbols, with a goal of
reducing duplicated code blocks and having more readable code.
No change in functionality.
Change-Id: I1b020b3ee993674329b2bebfd7c35995e3a2c043
Reviewed-on: https://go-review.googlesource.com/c/go/+/228883
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
The trace tool had a broken link due to a parameter encoding error,
which has been corrected.
In addition:
- the user regions page has been enhanced to include links to
pprof style profiles for region specific io, block, syscall and
schedwait profiles.
- sortable table headers have a pointer cursor to indicate they're
clickable.
Fixes#38518
Change-Id: I26cd5157bd9753750f5f53ea03aac5d2d41b021c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228899
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This is more or less a direct translation, to get things going.
There are more things we can do to make it better, especially on
the handling of container symbols.
Change-Id: I11a0087e402be8d42b9d06869385ead531755272
Reviewed-on: https://go-review.googlesource.com/c/go/+/229125
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
On Plan 9, FileOpen with flag O_CREATE & ~O_TRUNC is done in two
steps. First, syscall.Open is attempted, to avoid truncation when opening
an existing file. If that fails because the file doesn't exist,
syscall.Create is used to create a new file. If the Create fails,
for example because we are racing with another process to create a
ModeExclusive file, the PathError returned from FileOpen should reflect
the result of the Create, not the "does not exist" error from the initial
Open attempt.
Fixes#38540
Change-Id: I90c95a301de417ecdf79cd52748591edb1dbf528
Reviewed-on: https://go-review.googlesource.com/c/go/+/229099
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>
Convert first section of 386 optimization rules to the typed aux form.
Adds addOffset{32,64} functions that returns ValAndOffs and a
ValAndOff.canAdd32 function that takes an int32.
Passes
GOARCH=386 gotip build -toolexec 'toolstash -cmp' -a std
Change-Id: I69d2a8ace6936d5e8ba6ba047183002bf07dd5be
Reviewed-on: https://go-review.googlesource.com/c/go/+/228825
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This is the second attempt. The first attempt was CL 229127,
which got rolled back by CL 229177, because it caused
an infinite loop during compilation on some platforms.
I didn't notice that the trybots hadn't completed when I submitted; mea culpa.
The bug was that we were checking x&(x-1)==0, which is also true of 0,
which does not have exactly one bit set.
This caused an infinite rewrite rule loop.
Updates #38547
file before after Δ %
compile 19678112 19669808 -8304 -0.042%
total 113143160 113134856 -8304 -0.007%
Change-Id: I417a4f806e1ba61277e31bab2e57dd3f1ac7e835
Reviewed-on: https://go-review.googlesource.com/c/go/+/229197
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Given:
type u struct{}
func (u) M() {}
type t struct { u; u2 u }
var v = reflect.ValueOf(t{})
Package reflect allows:
v.Method(0) // v.M
v.Field(0).Method(0) // v.u.M
but panics from:
v.Field(1).Method(0) // v.u2.M
because u2 is not an exported field. However, u is not an exported
field either, so this is inconsistent.
It seems like this behavior originates from #12367, where it was
decided to allow traversing unexported embedded fields to be able to
access their exported fields, since package reflect doesn't provide an
alternative way to access promoted fields directly.
But extending that logic to promoted *methods* was inappropriate,
because package reflect's normal method handling logic already handles
promoted methods correctly. This CL corrects that mistake.
Fixes#38521.
Change-Id: If65008965f35927b4e7927cddf8614695288eb19
Reviewed-on: https://go-review.googlesource.com/c/go/+/228902
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This was accidentally broken in CL 166462, which introduce another
function in the panicking path without adjusting the argument to
runtime.Caller.
Change-Id: Ib6f9ed8673fefd458c7a4e3a918c45c5b31ca552
Reviewed-on: https://go-review.googlesource.com/c/go/+/229082
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This is followup of CL 228860, which rewrite shift rules to use typed
aux. That CL introduced nlz* functions, to refactor left shift rules.
While at it, we realize there's a bug in old rules with both right/left
shift rules, but only fix for left shift rules only.
This CL fixes the bug for right shift rules.
Passes toolstash-check.
Change-Id: Id8f2158b1b66c9e87f3fdeaa7ae3e35dc0666f8b
Reviewed-on: https://go-review.googlesource.com/c/go/+/229137
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
This optimization works on any integer with exactly one bit set.
This is identical to being a power of two, except in the
most negative number. Use oneBit instead.
The rule now triggers in a few more places in std+cmd,
in packages encoding/asn1, crypto/elliptic, and
vendor/golang.org/x/crypto/cryptobyte.
This change obviates the need for CL 222479
by doing this optimization consistently in the compiler.
Change-Id: I983c6235290fdc634fda5e11b10f1f8ce041272f
Reviewed-on: https://go-review.googlesource.com/c/go/+/229124
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This reverts commit 98c32670fd454939794504225dca1d4ec55045d5.
Rolling-forward with trivial format-string fix
cmd/compile: adjust RISCV64 rewrite rules to use typed aux fields
Also add a typed version of mergeSym to rewrite.go to assist with a few
rules that used mergeSym in the untyped-form.
Remove a few extra int32 overflow checks that no longer make sense, as
adding two int8s or int16s should never overflow an int32.
Passes toolstash-check -all.
Original review: https://go-review.googlesource.com/c/go/+/228882
Change-Id: Ib63db4ee1687446f0f3d9f11575a40dd85cbce55
Reviewed-on: https://go-review.googlesource.com/c/go/+/229126
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Each invocation of 'go list' may consume a significant quantity of
system resources, including buffers for reading files and RAM for the
runtime's memory footprint.
Very small builders may even hit swap as a result of that load,
further exacerbating resource contention.
To avoid overloading small builders, restrict 'go list' calls to
runtime.GOMAXPROCS as it is set at the first call to loadImports.
This also somewhat improves running time even on larger machines: on
my workstation, this change reduces the wall time for 'go test
cmd/api' by around 100ms.
Updates #38537
Change-Id: I968e0f961a8f1d84c27e1ab8b621b9670dcfd448
Reviewed-on: https://go-review.googlesource.com/c/go/+/228998
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Also add a typed version of mergeSym to rewrite.go to assist with a few
rules that used mergeSym in the untyped-form.
Remove a few extra int32 overflow checks that no longer make sense, as
adding two int8s or int16s should never overflow an int32.
Passes toolstash-check -all.
Change-Id: I72ddd2b0d9001faa87ad0ab54f500057164661b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/228882
Reviewed-by: Keith Randall <khr@golang.org>
The rewrite loop in shortcircuit is identical to the one in fuse.
That's not surprising; shortcircuit is fuse-like.
Take advantage of that by merging the two loops.
Passes toolstash-check.
Change-Id: I642cb39a23d2ac8964ed577678f062fce721439c
Reviewed-on: https://go-review.googlesource.com/c/go/+/229003
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Create a couple of helper routines to aid in assigning symbols to
sections in dodata's allocateSections, then replace loops over symbol
lists with calls to the helpers, to reduce the amount of duplicate
code.
This patch also decouples gcprog/gcdata generation from
symbol-to-section assignment (previously intertwined), as an aid to
making the code less complicated.
No change in functionality.
Change-Id: If126579486bce458f697e32bad556df453df53e9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228781
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Change linker DWARF generation to move away from emitting a single
giant list of DWARF symbols, and instead emit a list of descriptors,
with each descriptor holding the symbols for a specific DWARF section.
While placing all DWARF symbols in a single lists does come in handy
in certain instances, it also creates a lot of confusion and weird
code in other cases, specifically where we want to perform operations
on a section-by-section basis (resulting in code that tries to
re-discover section boundaries by walking/inspecting the list).
Change-Id: I4dac81bd38cba903c9fd7004d613597e76dfb77a
Reviewed-on: https://go-review.googlesource.com/c/go/+/228780
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Move more items into the dodata state object (including the "datsize"
variable used in allocateSections) and the Link ctxt pointer), so as
to prepare for follow-on refactorings. No change in functionality.
Change-Id: Ie2b1651c1ac9b89deb3f7692227dcd931240afa9
Reviewed-on: https://go-review.googlesource.com/c/go/+/228779
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The fallocate calls will lower the chances of SIGBUS in the linker, but
it might still happen on other unsupported platforms and filesystems.
Darwin cmd/compile stats:
Munmap 16.0ms ± 8% 0.8ms ± 3% -95.19% (p=0.000 n=8+10)
TotalTime 484ms ± 2% 462ms ± 2% -4.52% (p=0.000 n=10+9)
Updates #37310
Change-Id: I41c6e490adec26fa1ebee49a5b268828f5ba05e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/228385
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
When using plugins, on darwin we do weird things with
runtime.etext symbol, assigning a value for it, then clear it,
reassign a different value. This breaks the logic of writing text
address directly.
I think we should remove the weird thing with runtime.etext, if
possible. But for now, disable the optimization (this is not a
common case anyway).
Fix darwin-nocgo build.
Change-Id: Iab6a9f8519115226a5bbaaafe4a93f17042a928a
Reviewed-on: https://go-review.googlesource.com/c/go/+/229057
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
It was possible for a Tx that was aborted for rollback
asynchronously to execute a query after the rollback had completed
on the database, which often would auto commit the query outside
of the transaction.
By W-locking the tx.closemu prior to issuing the rollback
connection it ensures any Tx query either fails or finishes
on the Tx, and never after the Tx has rolled back.
Fixes#34775Fixes#32942
Change-Id: I017b7932082f2f4ead70bae08b61ed9068ac1d01
Reviewed-on: https://go-review.googlesource.com/c/go/+/216240
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
With the original connection reuse strategy, it was possible that
when a new connection was requested, the pool would wait for an
an existing connection to return for re-use in a full connection
pool, and then it would check if the returned connection was expired.
If the returned connection expired while awaiting re-use, it would
return an error to the location requestiong the new connection.
The existing call sites requesting a new connection was often the last
attempt at returning a connection for a query. This would then
result in a failed query.
This change ensures that we perform the expiry check right
before a connection is inserted back in to the connection pool
for while requesting a new connection. If requesting a new connection
it will no longer fail due to the connection expiring.
Fixes#32530
Change-Id: If16379befe0e14d90160219c0c9396243fe062f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/216197
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Node.NonNil and Node.Bounded were a bit muddled. This led to #38496.
This change clarifies and documents them.
It also corrects one misuse.
However, since ssa conversion doesn't make full use of the bounded hint,
this correction doesn't change any generated code.
The next change will fix that.
Passes toolstash-check.
Change-Id: I2bcd487a0a4aef5d7f6090e653974fce0dce3b8e
Reviewed-on: https://go-review.googlesource.com/c/go/+/228787
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
The core CPU profiling loop contains a 100ms sleep.
This is important to reduce overhead.
However, it means that it takes 200ms to shutting down a program
with CPU profiling enabled. When trying to collect many samples
by running a short-lived program many times, this adds up.
This change cuts the shutdown penalty in half by skipping
the sleep whenever possible.
Change-Id: Ic3177f8e1a2d331fe1a1ecd7c8c06f50beb42535
Reviewed-on: https://go-review.googlesource.com/c/go/+/228886
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
All callers to gdata knew the kind of node they were working with,
so all calls to gdata have been replaced with more specific calls.
Some OADDR nodes were constructed solely for the purpose of
passing them to gdata for unwrapping. In those cases, we can now
cut to the chase.
Passes toolstash-check.
Change-Id: Iacc1abefd7f748cb269661a03768d3367319b0b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/228888
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
If we are internal linking a static executable, in pclntab
generation, the function addresses are known, so we can just use
them directly instead of emitting relocations.
For external linking or other build modes, we are generating a
relocatable binary so we still need to emit relocations.
Reduce some allocations: for linking cmd/compile,
name old alloc/op new alloc/op delta
Pclntab_GC 38.8MB ± 0% 36.4MB ± 0% -6.19% (p=0.008 n=5+5)
TODO: can we also do this in DWARF generation?
Change-Id: I43920d930ab1da97c205871027e01844a07a5e60
Reviewed-on: https://go-review.googlesource.com/c/go/+/228478
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Recreation of CL 228317.
The problem with that original CL was a late requested change,
reordering reloc and asmb, resulting in symbols having stale pointers to
their data. I've fixed this by preallocating the heap variable in OutBuf
for platforms w/o mmap.
Change-Id: Icdb392ac2c8d6518830f4c84cf422e78b8ab68c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/228782
Run-TryBot: Jeremy Faller <jeremy@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
CL 228859 refactored detecting reflect package logic in to isReflectPkg
function. The function has un-necessary nil check for p, so remove that
check.
Passes toolstash-check.
Change-Id: I2f3f1ac967fe8d176dda3f3b4698ded08602e2fa
Reviewed-on: https://go-review.googlesource.com/c/go/+/228861
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Convert all the 386 lowering rules to the typed aux form.
Passes
GOARCH=386 gotip build -toolexec 'toolstash -cmp' -a std
Change-Id: I15256f20bc4442391755e6fffb8206dcaab94830
Reviewed-on: https://go-review.googlesource.com/c/go/+/228818
Reviewed-by: Keith Randall <khr@golang.org>
Currently we only check for reflect.Value.Method. And
reflect.Value.MethodByName is covered since it calls
reflect.Value.Method internally. But it is brittle to rely on
implementation detail of the reflect package. Check for
MethodByName explicitly.
Change-Id: Ifa8920e997524003dade03abc4fb3c4e64723643
Reviewed-on: https://go-review.googlesource.com/c/go/+/228881
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
reflect.Type.Method (and MethodByName) can be used to obtain a
reference of a method by reflection. The linker needs to know
if reflect.Type.Method is called, and retain all exported methods
accordingly. This is handled by the compiler, which marks the
caller of reflect.Type.Method with REFLECTMETHOD attribute. The
current code failed to handle the reflect package itself, so the
method wrapper reflect.Type.Method is not marked. This CL fixes
it.
Fixes#38515.
Change-Id: I12904d23eda664cf1794bc3676152f3218fb762b
Reviewed-on: https://go-review.googlesource.com/c/go/+/228880
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
reflect.Value.Call, if reachable, used to bring all exported
methods live. CL 228792 fixes this, removing the check of
reflect.Value.Call. This CL adds a test.
Updates #38505.
Change-Id: Ib4cab3c3c86c9c9702d041266e59b159d0ff0a97
Reviewed-on: https://go-review.googlesource.com/c/go/+/228878
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
The types used while generating code, such as Rule and File, have been
exported for a while. This is harmless for a main package, and lets us
easily differentiate types from variables and functions, as well as use
names like "If" since "if" is a keyword.
However, the fields remained unexported. This was a bit inconsistent,
and also meant that we couldn't use some intuitive names like If.else.
Export them.
Besides the capitalization, the only change is that the If type now has
the fields Then and Else, instead of stmt and alt.
Change-Id: I426ff140c6ca186fec394f17b29165861da5fd98
Reviewed-on: https://go-review.googlesource.com/c/go/+/228821
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
In the linker's deadcode pass, we need to keep a method live if
it can be reached through reflection. We do this by marking all
exported method live if reflect.Value.Method or
reflect.Type.Method is used. Currently we also check for
reflect.Value.Call, which is unnecessary because in order to call
a method through reflection, the method must be obtained through
reflect.Value.Method or reflect.Type.Method, which we already
check.
Per discussion in https://groups.google.com/d/msg/golang-dev/eG9It63-Bxg/_bnoVy-eAwAJ
Thanks Brad, Russ, and Ian for bringing this up.
Change-Id: I8e9529a224bb898dbf5752674cc9d155db386c14
Reviewed-on: https://go-review.googlesource.com/c/go/+/228792
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
p.literal's doc comment said it returned a value but it doesn't.
While we're here, p.newLiteral is only called from p.literal,
so simplify the code by merging the two.
Change-Id: Ia357937a99f4e7473f0f1ec837113a39eaeb83d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/222659
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Everybody was deferring a flush when main already
did that, so drop all that nonsense. (Flush was doing
the package clause stuff.) But then make sure we do
get a package clause when there is correctly no output,
as for an empty package. Do that by triggering a
package clause in allDoc and packageDoc.
Slightly tricky but way less intricate than before.
Fixes#37969.
Change-Id: Ia86828436e6c4ab46e6fdaf2c550047f37f353f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/226998
Reviewed-by: Russ Cox <rsc@golang.org>
I'm planning to modify this test in a follow-up CL, so we might
as well convert it to a script test. I don't think there's an easy
way to detect whether we have a case-insensitive file system, without
adding a new condition to the script framework, so the test is just
guessing that darwin and windows could have case-insensitive file systems.
Change-Id: I48bb36f86f19898618681515ac448c3bb4735857
Reviewed-on: https://go-review.googlesource.com/c/go/+/228783
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
At least as far as I can tell, this file never explicitly states whether
locks with higher or lower rank should be taken first. It is implied in
some comments, and clear from the code, of course.
Add an explicit comment to make things more clear and hopefully reduce
new locks being adding in the wrong spot.
Change-Id: I17c6fd5fc216954e5f3550cf91f17e25139f1587
Reviewed-on: https://go-review.googlesource.com/c/go/+/228785
Reviewed-by: Dan Scales <danscales@google.com>
When the seconds param is given, the block and mutex profile endpoints
report the difference between two measurements collected the given
seconds apart. Historically, the block and mutex profiles have reported
the cumulative counts since the process start, and it turned out they
are more useful when interpreted along with the time duration.
Note: cpu profile and trace endpoints already accept the "seconds"
parameter. With this CL, the block and mutex profile endpoints will
accept the "seconds" parameter. Providing the "seconds" parameter
to other types of profiles is an error.
This change moves runtime/pprof/internal/profile to internal/profile and
adds part of merge logic from github.com/google/pprof/profile/merge.go to
internal/profile, in order to allow both net/http/pprof and runtime/pprof
to access it.
Fixes#23401
Change-Id: Ie2486f1a63eb8ff210d7d3bc2de683e9335fd5cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/147598
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This first pass makes the rules using the condition code mask
(CCMask) and rotate parameters (RotateParams) aux values strongly
typed. This required adding strongly typed aux handling to the
block rulegen.
More CLs like this to follow, but this is probably the most
complex.
Passes toolstash-check -all.
Change-Id: Ie513b07d527f0c1b398d7748331442dcb5f7b17d
Reviewed-on: https://go-review.googlesource.com/c/go/+/228518
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
These were originally introduced for the binary export format, which
required forward references to arbitrary types and later filling them
in. They're no longer needed since we switched to the indexed export
format, which only requires forward references to declared types.
Passes toolstash-check.
Change-Id: I696dc9029ec7652d01ff49fb98e658a9ed510979
Reviewed-on: https://go-review.googlesource.com/c/go/+/228579
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
These are analogous to URL.RawPath and URL.EscapedPath
and allow users fine-grained control over how the fragment
section of the URL is escaped. Some tools care about / vs %2f,
same problem as in paths.
Fixes#37776.
Change-Id: Ie6f556d86bdff750c47fe65398cbafd834152b47
Reviewed-on: https://go-review.googlesource.com/c/go/+/227645
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
The existing implementation is not compatible with JSON
escape as it uses hex escaping.
Unicode escape, instead, is valid for both JSON and JS.
This fix avoids creating a separate escaping context for
scripts of type "application/ld+json" and it is more
future-proof in case more JSON+JS contexts get added
to the platform (e.g. import maps).
Fixes#33671Fixes#37634
Change-Id: Id6f6524b4abc52e81d9d744d46bbe5bf2e081543
Reviewed-on: https://go-review.googlesource.com/c/go/+/226097
Reviewed-by: Carl Johnson <me@carlmjohnson.net>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
When a concrete type doesn't exactly implement an interface, the error
messages produced by go/types are often unhelpful. The compiler shows
the expected signature versus the one found, which is useful, so add
this behavior here.
Fixesgolang/go#38475
Change-Id: I8b780b7e1f1f433a0efe670de3b1437053f42fba
Reviewed-on: https://go-review.googlesource.com/c/go/+/228457
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
If we are internal linking a static executable, and address assignment
has happened, then when emitting some parts of DWARF we can just emit
a function address directly instead of generating a relocation. For
external linking or other build modes, we are generating a relocatable
binary so we still need to emit relocations.
This CL inspired by Cherry's similar CL for pclntab at
https://go-review.googlesource.com/c/go/+/228478.
Change-Id: Ib03fbe2dd72d0ba746bf46015e0f2d6c3f3d53ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/228537
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Now that we have converted pclntab pass to using the loader,
trampoline insertion should work again. Add a test.
Change-Id: Ia9a0485456ac75cc6e706218a359f109cd8fce43
Reviewed-on: https://go-review.googlesource.com/c/go/+/228141
Reviewed-by: Than McIntosh <thanm@google.com>
lib.Textp2 is used to assemble the global Textp2. It is not used
after that point. Free some memory.
Slightly reduces allocation: for linking cmd/compile,
Linksetup_GC 1.10MB ± 0% 0.84MB ± 0% -23.43% (p=0.008 n=5+5)
Change-Id: Iec4572e282655306d5ff3e490f8855d479e45acf
Reviewed-on: https://go-review.googlesource.com/c/go/+/228481
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
The Context object we pass to GetThreadContext on Windows must be 16
byte-aligned. We also can't allocate in the contexts where we create
these, so they must be stack-allocated. There's no great way to do
this, but this CL makes the code at least a little clearer, and makes
profilem and preemptM more consistent with each other.
Change-Id: I5ec47a27d7580ed6003030bf953e668e8cae2cef
Reviewed-on: https://go-review.googlesource.com/c/go/+/207967
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Currently, as a result of us releasing worldsema now to allow STW events
during a mark phase, we release worldsema between starting the world and
having the goroutine block in STW mode. This inserts preemption points
which, if followed through, could lead to a deadlock. Specifically,
because user goroutine scheduling is disabled in STW mode, the goroutine
will block before properly releasing worldsema.
The fix here is to prevent preemption while releasing the worldsema.
Fixes#38404.
Updates #19812.
Change-Id: I8ed5b3aa108ab2e4680c38e77b0584fb75690e3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/228337
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
After CL 211357 (commit 499dc1c),
hasTests and numDecl were not updated properly for function
declarations with parameters, which affected the whole file
example detection logic. This caused examples like
package foo_test
func Foo(x int) {
}
func Example() {
fmt.Println("Hello, world!")
// Output: Hello, world!
}
to not be detected as whole file ones.
Change-Id: I9ebd47e52d7ee9d91eb6f8e0257511de69b2a402
GitHub-Last-Rev: cc71c31124
GitHub-Pull-Request: golang/go#37730
Reviewed-on: https://go-review.googlesource.com/c/go/+/222477
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Agniva De Sarker <agniva.quicksilver@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This saves 166 KiB for a tls.Dial hello world program (5382441 to
5212356 to bytes), by permitting the linker to remove TLS server code.
Change-Id: I16610b836bb0802b7d84995ff881d79ec03b6a84
Reviewed-on: https://go-review.googlesource.com/c/go/+/228111
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Float.Sqrt method switches (for performance reasons) between
direct (uses Quo) and inverse (doesn't) computation, depending on the
precision, with threshold 128.
Unfortunately the implementation of recursive division in CL 172018
made Quo slightly slower exactly in the range around and below the
threshold Sqrt is using, so this strategy is no longer profitable.
The new division algorithm allocates more, and this has increased the
amount of allocations performed by Sqrt when using the direct method;
on low precisions the computation is fast, so additional allocations
have an negative impact on performance.
Interestingly, only using the inverse method doesn't just reverse the
effects of the Quo algorithm change, but it seems to make performances
better overall for small precisions:
name old time/op new time/op delta
FloatSqrt/64-4 643ns ± 1% 635ns ± 1% -1.24% (p=0.000 n=10+10)
FloatSqrt/128-4 1.44µs ± 1% 1.02µs ± 1% -29.25% (p=0.000 n=10+10)
FloatSqrt/256-4 1.49µs ± 1% 1.49µs ± 1% ~ (p=0.752 n=10+10)
FloatSqrt/1000-4 3.71µs ± 1% 3.74µs ± 1% +0.87% (p=0.001 n=10+10)
FloatSqrt/10000-4 35.3µs ± 1% 35.6µs ± 1% +0.82% (p=0.002 n=10+9)
FloatSqrt/100000-4 844µs ± 1% 844µs ± 0% ~ (p=0.549 n=10+9)
FloatSqrt/1000000-4 69.5ms ± 0% 69.6ms ± 0% ~ (p=0.222 n=9+9)
name old alloc/op new alloc/op delta
FloatSqrt/64-4 280B ± 0% 200B ± 0% -28.57% (p=0.000 n=10+10)
FloatSqrt/128-4 504B ± 0% 248B ± 0% -50.79% (p=0.000 n=10+10)
FloatSqrt/256-4 344B ± 0% 344B ± 0% ~ (all equal)
FloatSqrt/1000-4 1.30kB ± 0% 1.30kB ± 0% ~ (all equal)
FloatSqrt/10000-4 13.5kB ± 0% 13.5kB ± 0% ~ (p=0.237 n=10+10)
FloatSqrt/100000-4 123kB ± 0% 123kB ± 0% ~ (p=0.247 n=10+10)
FloatSqrt/1000000-4 1.83MB ± 1% 1.83MB ± 3% ~ (p=0.779 n=8+10)
name old allocs/op new allocs/op delta
FloatSqrt/64-4 8.00 ± 0% 5.00 ± 0% -37.50% (p=0.000 n=10+10)
FloatSqrt/128-4 11.0 ± 0% 5.0 ± 0% -54.55% (p=0.000 n=10+10)
FloatSqrt/256-4 5.00 ± 0% 5.00 ± 0% ~ (all equal)
FloatSqrt/1000-4 6.00 ± 0% 6.00 ± 0% ~ (all equal)
FloatSqrt/10000-4 6.00 ± 0% 6.00 ± 0% ~ (all equal)
FloatSqrt/100000-4 6.00 ± 0% 6.00 ± 0% ~ (all equal)
FloatSqrt/1000000-4 10.3 ±13% 10.3 ±13% ~ (p=1.000 n=10+10)
For example, 1.02µs for FloatSqrt/128 is actually better than what I
was getting on the same machine before the Quo changes.
The .8% slowdown on /1000 and /10000 appears to be real and it is
quite baffling (that codepath was not touched at all); it may be
caused by code alignment changes.
Change-Id: Ib03761cdc1055674bc7526d4f3a23d7a25094029
Reviewed-on: https://go-review.googlesource.com/c/go/+/228062
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This adds support support for the PCALIGN value 32. When this
directive occurs code will be aligned to 32 bytes unless
too many NOPs are needed, and then will fall back to 16
byte alignment.
On Linux the function's alignment is promoted from 16 to 32
in functions where PCALIGN 32 appears. On AIX the function's
alignment is left at 16 due to complexity with modifying its
alignment, which means code will be aligned to at least 16,
possibly 32 at times, which is still good.
Test was updated to accept new value.
Change-Id: I28e72d5f30ca472ed9ba736ddeabfea192d11797
Reviewed-on: https://go-review.googlesource.com/c/go/+/228258
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Begin refactoring dodata to try to convert it from a single giant blob
to something more hierarchical, with descriptive function names for
sub-parts.
Add a state object to hold things like "data" and "dataMaxAlign"
arrays that are used throughout dodata. Extract out the code that
allocates data symbols to sections into a separate method (this
method is still too big, probably needs to be refactored again).
No change in functionality.
Change-Id: I7b52dc2aff0356e7d4b5d6f629d907fd37d3082c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228259
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
TestExtraFiles seems to be flaky on GNU/Linux systems when using cgo
because creating a new thread will call malloc which can create a new
arena which can open a file to see how many processors there are.
Try to avoid the flake by creating several new threads at process
startup time.
For #25628
Change-Id: Ie781acdbba475d993c39782fe172cf7f29a05b24
Reviewed-on: https://go-review.googlesource.com/c/go/+/228099
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Importing the time/tzdata package will embed a copy of the IANA
timezone database into the program. This will let the program work
correctly when the timezone database is not available on the system.
It will increase the size of the binary by about 800K.
You can also build a program with -tags timetzdata to embed the
timezone database in the program being built.
This is a roll forward of CL 224588 which was rolled back due to
test failures. In this version, the test is in the time package,
not the time/tzdata package. That lets us compare the zip file
to the time/tzdata package, ensuring that we are looking at similar
versions of tzdata information.
Fixes#21881Fixes#38013Fixes#38017
Change-Id: I916d9d8473abe201b897cdc2bbd9168df4ad671c
Reviewed-on: https://go-review.googlesource.com/c/go/+/228101
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
When setting the edge state in register allocation we should only
be setting each register once. It is not possible for a register
to hold multiple values at once.
This CL converts the runtime error seen in #38195 into an internal
compiler error (ICE). It is better for the compiler to fail than
generate an incorrect program.
The bug reported in #38195 is now exposed as:
./parserc.go:459:11: internal compiler error: 'yaml_parser_parse_node': R5 is already set (v1074/v1241)
[stack trace]
Updates #38195.
Change-Id: Id95842fd850b95494cbd472b6fd5a55513ecacec
Reviewed-on: https://go-review.googlesource.com/c/go/+/228060
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When deallocating the input register to a phi so that the phi
itself could be allocated to that register the code was also
deallocating all copies of that phi input value. Those copies
of the value could still be live and if they were the register
allocator could reuse them incorrectly to hold speculative
copies of other phi inputs. This causes strange bugs.
No test because this is a very obscure scenario that is hard
to replicate but CL 228060 adds an assertion to the compiler
that does trigger when running the std tests on linux/s390x
without this CL applied. Hopefully that assertion will prevent
future regressions.
Fixes#38195.
Change-Id: Id975dadedd731c7bb21933b9ea6b17daaa5c9e1d
Reviewed-on: https://go-review.googlesource.com/c/go/+/228061
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When inserting Select0 and Select1 ops we need to ensure that they
live in the same block as their argument. This is because they need
to be scheduled immediately after their argument for register and
flag allocation to work correctly.
Fixes#38356.
Change-Id: Iba384dbe87010f1c7c4ce909f08011e5f1de7fd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/227879
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
CL 228106 moved the position at which we
checked whether a type switch variable had a particular type
from the type switch to the case statement, but only for
single, concrete types. This is a better position,
so this change changes the rest.
Change-Id: I601d4a5c4a0d9400e7804b9f1e729af948349a8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/228220
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Consider
switch x:= x.(type) {
case int:
// int stmts
case error:
// error stmts
}
Prior to this change, we lowered this roughly as:
if x, ok := x.(int); ok {
// int stmts
} else if x, ok := x.(error); ok {
// error stmts
}
x, ok := x.(error) is implemented with a call to runtime.assertE2I2 or runtime.assertI2I2.
x, ok := x.(int) generates inline code that checks whether x has type int,
and populates x and ok as appropriate. We then immediately branch again on ok.
The shortcircuit pass in the SSA backend is designed to recognize situations
like this, in which we are immediately branching on a bool value
that we just calculated with a branch.
However, the shortcircuit pass has limitations when the intermediate state has phis.
In this case, the phi value is x (the int).
CL 222923 improved the situation, but many cases are still unhandled.
I have further improvements in progress, which is how I found this particular problem,
but they are expensive, and may or may not see the light of day.
In the common case of a lone concrete type in a type switch case,
it is easier and cheaper to simply lower a different way, roughly:
if _, ok := x.(int); ok {
x := x.(int)
// int stmts
}
Instead of using a type assertion, though, we extract the value of x
from the interface directly.
This removes the need to track x (the int) across the branch on ok,
which removes the phi, which lets the shortcircuit pass do its job.
Benchmarks for encoding/binary show improvements, as well as some
wild swings on the super fast benchmarks (alignment effects?):
name old time/op new time/op delta
ReadSlice1000Int32s-8 5.25µs ± 2% 4.87µs ± 3% -7.11% (p=0.000 n=44+49)
ReadStruct-8 451ns ± 2% 417ns ± 2% -7.39% (p=0.000 n=45+46)
WriteStruct-8 412ns ± 2% 405ns ± 3% -1.58% (p=0.000 n=46+48)
ReadInts-8 296ns ± 8% 275ns ± 3% -7.23% (p=0.000 n=48+50)
WriteInts-8 324ns ± 1% 318ns ± 2% -1.67% (p=0.000 n=44+49)
WriteSlice1000Int32s-8 5.21µs ± 2% 4.92µs ± 1% -5.67% (p=0.000 n=46+44)
PutUint16-8 0.58ns ± 2% 0.59ns ± 2% +0.63% (p=0.000 n=49+49)
PutUint32-8 0.87ns ± 1% 0.58ns ± 1% -33.10% (p=0.000 n=46+44)
PutUint64-8 0.66ns ± 2% 0.87ns ± 2% +33.07% (p=0.000 n=47+48)
LittleEndianPutUint16-8 0.86ns ± 2% 0.87ns ± 2% +0.55% (p=0.003 n=47+50)
LittleEndianPutUint32-8 0.87ns ± 1% 0.87ns ± 1% ~ (p=0.547 n=45+47)
LittleEndianPutUint64-8 0.87ns ± 2% 0.87ns ± 1% ~ (p=0.451 n=46+47)
ReadFloats-8 79.8ns ± 5% 75.9ns ± 2% -4.83% (p=0.000 n=50+47)
WriteFloats-8 89.3ns ± 1% 88.9ns ± 1% -0.48% (p=0.000 n=46+44)
ReadSlice1000Float32s-8 5.51µs ± 1% 4.87µs ± 2% -11.74% (p=0.000 n=47+46)
WriteSlice1000Float32s-8 5.51µs ± 1% 4.93µs ± 1% -10.60% (p=0.000 n=48+47)
PutUvarint32-8 25.9ns ± 2% 24.0ns ± 2% -7.02% (p=0.000 n=48+50)
PutUvarint64-8 75.1ns ± 1% 61.5ns ± 2% -18.12% (p=0.000 n=45+47)
[Geo mean] 57.3ns 54.3ns -5.33%
Despite the rarity of type switches, this generates noticeably smaller binaries.
file before after Δ %
addr2line 4413296 4409200 -4096 -0.093%
api 5982648 5962168 -20480 -0.342%
cgo 4854168 4833688 -20480 -0.422%
compile 19694784 19682560 -12224 -0.062%
cover 5278008 5265720 -12288 -0.233%
doc 4694824 4682536 -12288 -0.262%
fix 3411336 3394952 -16384 -0.480%
link 6721496 6717400 -4096 -0.061%
nm 4371152 4358864 -12288 -0.281%
objdump 4760960 4752768 -8192 -0.172%
pprof 14810820 14790340 -20480 -0.138%
trace 11681076 11668788 -12288 -0.105%
vet 8285464 8244504 -40960 -0.494%
total 115824120 115627576 -196544 -0.170%
Compiler performance is marginally improved (note that go/types has many type switches):
name old alloc/op new alloc/op delta
Template 35.0MB ± 0% 35.0MB ± 0% +0.09% (p=0.008 n=5+5)
Unicode 28.5MB ± 0% 28.5MB ± 0% ~ (p=0.548 n=5+5)
GoTypes 114MB ± 0% 114MB ± 0% -0.76% (p=0.008 n=5+5)
Compiler 541MB ± 0% 541MB ± 0% -0.03% (p=0.008 n=5+5)
SSA 1.17GB ± 0% 1.17GB ± 0% ~ (p=0.841 n=5+5)
Flate 21.9MB ± 0% 21.9MB ± 0% ~ (p=0.421 n=5+5)
GoParser 26.9MB ± 0% 26.9MB ± 0% ~ (p=0.222 n=5+5)
Reflect 74.6MB ± 0% 74.6MB ± 0% ~ (p=1.000 n=5+5)
Tar 32.9MB ± 0% 32.8MB ± 0% ~ (p=0.056 n=5+5)
XML 42.4MB ± 0% 42.1MB ± 0% -0.77% (p=0.008 n=5+5)
[Geo mean] 73.2MB 73.1MB -0.15%
name old allocs/op new allocs/op delta
Template 377k ± 0% 377k ± 0% +0.06% (p=0.008 n=5+5)
Unicode 354k ± 0% 354k ± 0% ~ (p=0.095 n=5+5)
GoTypes 1.31M ± 0% 1.30M ± 0% -0.73% (p=0.008 n=5+5)
Compiler 5.44M ± 0% 5.44M ± 0% -0.04% (p=0.008 n=5+5)
SSA 11.7M ± 0% 11.7M ± 0% ~ (p=1.000 n=5+5)
Flate 239k ± 0% 239k ± 0% ~ (p=1.000 n=5+5)
GoParser 302k ± 0% 302k ± 0% -0.04% (p=0.008 n=5+5)
Reflect 977k ± 0% 977k ± 0% ~ (p=0.690 n=5+5)
Tar 346k ± 0% 346k ± 0% ~ (p=0.889 n=5+5)
XML 431k ± 0% 430k ± 0% -0.25% (p=0.008 n=5+5)
[Geo mean] 806k 806k -0.10%
For packages with many type switches, this considerably shrinks function text size.
Some examples:
file before after Δ %
encoding/binary.s 30726 29504 -1222 -3.977%
go/printer.s 77597 76005 -1592 -2.052%
cmd/vendor/golang.org/x/tools/go/ast/astutil.s 65704 63318 -2386 -3.631%
cmd/vendor/golang.org/x/tools/go/analysis/passes/unreachable.s 8047 7714 -333 -4.138%
Text size regressions are rare.
Change-Id: Ic10982bbb04876250eaa5bfee97990141ae5fc28
Reviewed-on: https://go-review.googlesource.com/c/go/+/228106
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
In the dev.link branch we continued developing the new object
file format support and the linker improvements described in
https://golang.org/s/better-linker . Since the last merge, more
progress has been made to improve the new linker.
This is a clean merge, as we already merged master branch to
dev.link first.
Change-Id: I1fef2b1d94bd2410001142da8991544da5ee896d
ascompatee does not generate 'x = x' during return, so we don't have to
check for samelist and disguising special return anymore.
While at it, also remove samelist, as this is the only place it's used.
Passes toolstash-check.
Change-Id: I41c7b077d562aadb5916a61e2ab6229bae3cdef4
Reviewed-on: https://go-review.googlesource.com/c/go/+/227807
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Currently this CL has no effect because V == x.typ in the affected
code. But if we should ever manipulate V (e.g., to support some form
of lazy evaluation of the type), not using V consistently would
lead to a subtle bug.
Change-Id: I465e72d18bbd2b6cd8fcbd746e0d28d14f758c03
Reviewed-on: https://go-review.googlesource.com/c/go/+/228105
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Quote original values passed as substring of ParseError.Message.
Improves the user experience of ParseDuration by making it
quote its original argument, for example:
_, err := time.ParseDuration("for breakfast")
will now produce an error, which when printed out is:
time: invalid duration "for breakfast"
instead of:
time: invalid duration for breakfast
Adapt test cases for format.Parse and format.ParseDuration.
Fixes#38295
Change-Id: Ife322c8f3c859e1e4e8dd546d4cf0d519b4bfa81
Reviewed-on: https://go-review.googlesource.com/c/go/+/227878
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
- CopyN: 5 creates ambiguity with respect to whitespace and upperbound
- TeeReader less boilerplate and displays a common usage of it
- SectionReader_* all sections unified to 5:17 for clarity
- SectionReader_Seek uses io.Copy to stdout like other examples
- Seeker_Seek remove useless prints
- Pipe print reader like other examples
Updates #36417
Change-Id: Ibd01761d5a5786cdb1ea934f7a98f8302430c8a5
GitHub-Last-Rev: 4c17f9a8e3
GitHub-Pull-Request: golang/go#38379
Reviewed-on: https://go-review.googlesource.com/c/go/+/227868
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
We split the output into blocks and write them in parallel. The
block boundary is placed at symbol boundary. In the case of outer
symbols and sub symbols, currently we may split an outer symbol
into two blocks. This will be bad, as the two blocks will have
overlapping address range, since outer symbol and its sub symbols
occupies the same address range.
Make sure we place block boundary only at top-level symbol
boundaries.
Fix boringcrypto build.
Change-Id: I56811d3969c65c6be97672d8e1f1ea36b2447465
Reviewed-on: https://go-review.googlesource.com/c/go/+/227957
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
(cherry picked from commit 636fa3148f)
Reviewed-on: https://go-review.googlesource.com/c/go/+/228138
If -d=ssa/PASS/debug=N is specified (N >= 2) for a rewrite pass
(e.g. lower), when a Value (or Block) is rewritten, print the
Value (or Block) before and after.
For #31915.
Updates #19013.
Change-Id: I80eadd44302ae736bc7daed0ef68529ab7a16776
Reviewed-on: https://go-review.googlesource.com/c/go/+/176718
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Importing the time/tzdata package will embed a copy of the IANA
timezone database into the program. This will let the program work
correctly when the timezone database is not available on the system.
It will increase the size of the binary by about 800K.
You can also build a program with -tags timetzdata to embed the
timezone database in the program being built.
Fixes#21881Fixes#38013Fixes#38017
Change-Id: Iffddee72a8f46c95fee3bcde43c142d6899d9246
Reviewed-on: https://go-review.googlesource.com/c/go/+/224588
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Following CL 226818, the compiler will allow inlining a single cycle in
an inline chain. Immediately-recursive functions are still disallowed,
which is what this heuristic refers to.
Add a regression test for this case.
Note that in addition to this check, if the compiler were to inline
multiple cycles via a loop (i.e., rather than appending duplicate code),
much more work would be required here to handle a single address
appearing in multiple different inline frames.
Updates #29737
Change-Id: I88de15cfbeabb9c04381e1c12cc36778623132a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/227346
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
TestTryAdd is particularly brittle because it tests some real cases by
constructing fake sample stack frames. If those frames don't correctly
represent what the runtime would generate then they may fail to catch
regressions.
Instead, call runtime.Callers at the bottom of real function calls to
generate real frames as a base for truncation, etc in tests. Several of
these tests still have to fake parts of the frames to test the right
thing, but this is a bit less fragile.
This change is equivalent to the original
0dfb0513ec (golang.org/cl/227484), except
that the test skips if the test functions aren't inline (e.g., noopt
builders).
Change-Id: Ie9e32b5660cfe28a924f9cfcddcd887ea2effd66
Reviewed-on: https://go-review.googlesource.com/c/go/+/227922
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
It is no longer used. The only remaining use is in generating
Plan 9 debug info, which is already not supported.
Change-Id: Ia023d6f2fa7d57b97ba861ce464e2eec8ac2d1f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/228142
Reviewed-by: Than McIntosh <thanm@google.com>
lib.Textp was used for text address assignment and trampoline
insertion. Now that it has been converted to using the loader,
no need to populate lib.Textp.
Port the logic of canonicalizing dupok symbol's package to the
loader.
unit.Textp was used for DWARF generation, which has also been
converted to using the loader.
Change-Id: I22d4dd30a52a29dd5b1b7b795d43a19f6215e4ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/228140
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Mark nextFreeFast as not inline, as it is too expensive to inline on riscv64.
Also remove riscv64 from non-atomic inline architectures, as we now have
atomic intrisics.
Updates #22239
Change-Id: I6e0e72c1192070e39f065bee486f48df4cc74b35
Reviewed-on: https://go-review.googlesource.com/c/go/+/227808
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The taskid mode is based on the goroutine-oriented trace view,
which displays each goroutine as a separate row. This is good when
inspecting the interaction and timeline among related goroutines,
and the user region information (associated with each goroutine)
in detail, but when many goroutines are involved, this mode does
not scale.
The focustask mode is based on the default trace view with the
user task hierarchy at the top. Each row is a P and there are only
a handful number of Ps in most cases, so browsers can handle
this mode more gracefully. But, I had difficulty in displaying
the user region information (because a goroutine can start/stop/
migrate across Ps, and visualizing the stack of regions nicely
was complicated). It may be doable, but it's a work.
This CL surfaces the hidden focustask mode. Moreover, use it
as the default user task view mode. The taskid mode can be still
accessible through 'goroutine view' links.
Unlike taskid-based user annotation view that extends goroutine-based
trace view, the focustask view
Change-Id: Ib691a5e1dd14695fa70a0ae67bff62817025e8c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/227921
Reviewed-by: Michael Matloob <matloob@golang.org>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Otherwise, just copying the aux and auxint fields doesn't make much sense.
(Although there's no bug - it just means it isn't typechecked correctly.)
Change-Id: I4e21ac67f0c7bfd04ed5af1713cd24bca08af092
Reviewed-on: https://go-review.googlesource.com/c/go/+/227962
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
HWCap and HWCap2 are no longer linknamed into package runtime. Also,
merge two sentences both starting with "These are..." and don't mention
any file name where archauxv is defined, as it become outdated if
support for a new $GOOS/$GOARCH combination is added. This is e.g.
already the case for arm64, where archauxv is also defined for
freebsd/arm64.
Change-Id: I9314a66633736b12e777869a832d8b79d442a6f8
Reviewed-on: https://go-review.googlesource.com/c/go/+/228057
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Remove the loader's AttrContainer method, since it is no longer
needed. All of the code in the linker that used s.Attr.Container() is
now upstream of loadlibfull(), and the code in question now uses local
bitmaps to keep track of container text symbols as opposed to loader
methods.
Change-Id: Iae956d24bef2776e181c3b8208476dcb0b9a2916
Reviewed-on: https://go-review.googlesource.com/c/go/+/227959
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The pclntab phase generates a series of "inltree.*" symbols with
inlining related pcdata; these symbols previously were given names and
enterered into the symbol lookup table, but there is no real reason to
do this, since they never need to be looked up when pcln generation is
done. Switch them over to anonymous symbols.
So as to insure that the later symtab phase picks them up correctly,
assign them a type of SGOFUNC instead of SRODATA, and change symtab to
look for this when assigning symbols to groups.
Change-Id: I38225dbb130ad7aea5d16f79cef3d8d388c61c2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227845
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
We split the output into blocks and write them in parallel. The
block boundary is placed at symbol boundary. In the case of outer
symbols and sub symbols, currently we may split an outer symbol
into two blocks. This will be bad, as the two blocks will have
overlapping address range, since outer symbol and its sub symbols
occupies the same address range.
Make sure we place block boundary only at top-level symbol
boundaries.
Fix boringcrypto build.
Change-Id: I56811d3969c65c6be97672d8e1f1ea36b2447465
Reviewed-on: https://go-review.googlesource.com/c/go/+/227957
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
In the review of CL 222923, Keith expressed concern
that we could end up with invalid phis.
We have some code to handle this, but on further reflection,
I think it might not handle some cases in which phis get moved.
I can't create a failing case, but guard against it nevertheless.
Change-Id: Ib3a07ac1d36a674c72dcb9cc9261ccfcb716b5a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/227697
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
CL 226737 optimizes len check when make slice. The comment that cap is
constrainted to [0, 2^31) is not quite true, it's 31 or 63 depends on
whether it's 32/64-bit systems.
Change-Id: I6f54e41827ffe4d0b67a44975da3ce07b2fabbad
Reviewed-on: https://go-review.googlesource.com/c/go/+/227803
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Move a lot of the constant folding rules to use strongly
typed AuxInt fields.
We need more than a cast to convert AuxInt to, e.g., float32.
Make conversion functions for converting back and forth.
Change-Id: Ia3d95ee3583ee2179a10938e20210a7617358c88
Reviewed-on: https://go-review.googlesource.com/c/go/+/227866
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Giovanni Bajo <rasky@develer.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
The race detector can't handle ASLR (adddress space layout randomization).
On some platforms it can re-exec the binary with ASLR off. But not NetBSD.
For NetBSD we have to introduce a special ELF header note that tells
the kernel not to use ASLR.
This works fine for internal linking. For external linking it also works,
but "readelf -n" shows multiple notes in the resulting binary. Maybe the
last one wins? Not sure, but it appears to work.
Change-Id: I5fe6dd861e42a8293f64d0dacb166631ea670fcc
Reviewed-on: https://go-review.googlesource.com/c/go/+/227864
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
For 1.15.
From the test:
{"range":{"start":{"line":7,"character":13},"end":{...},"severity":3,"code":"leaks","source":"go compiler","message":"parameter z leaks to ~r2 with derefs=0","relatedInformation":[
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: flow: y = z:"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: from y = \u003cN\u003e (assign-pair)"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: flow: ~r1 = y:"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":4,"character":11},"end":{...}},"message":"inlineLoc"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: from y.b (dot of pointer)"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":4,"character":11},"end":{...}},"message":"inlineLoc"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: from \u0026y.b (address-of)"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":4,"character":9},"end":...}},"message":"inlineLoc"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":13},"end":{...}},"message":"escflow: from ~r1 = \u003cN\u003e (assign-pair)"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":3},"end":...}},"message":"escflow: flow: ~r2 = ~r1:"},
{"location":{"uri":"file://T/file.go","range":{"start":{"line":9,"character":3},"end":...}},"message":"escflow: from return (*int)(~r1) (return)"}]}
Change-Id: Idf02438801f63e487c35a928cf5a0b6d3cc48674
Reviewed-on: https://go-review.googlesource.com/c/go/+/206658
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
If a Go symbol is cloned to external, we should preserve its Aux
symbols for FuncInfo, etc.. We already do this in
loader.FuncInfo, but not in FuncInfo.Funcdata. Do it in the
latter as well. In fact, since FuncInfo and Funcdata should use
the same set of auxs, just record the auxs and reuse.
Should fix PPC64 build.
Change-Id: Iab9020eaca15d98fe3bb41f50f0d5bdb4999e8c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/227848
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Previous PCALIGN support on ppc64x only accepted 8 and 16 byte
alignment since the default function alignment was 16. Now that
the function's alignment can be set to a larger value when needed,
PCALIGN can accept 32. When this happens then the function's
alignment will be changed to 32.
Test has been updated to recognized this new value.
Change-Id: If82c3cd50d7c686fcf8a9e819708b15660cdfa63
Reviewed-on: https://go-review.googlesource.com/c/go/+/227775
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Rework the linker's pcln phase to work with the new loader. As part of
this set of changes the handling of "go.file..." symbols has been
revised somewhat -- previously they were treated as always live in the
loader, and now we no longer do this.
The original plan had been to have the new implementation generate
nameless "inltree" symbols, however the plan now is to keep them
named for now and convert them to nameless in a subsequent patch.
Change-Id: If71c93ff1f146dbb63b6ee2546308acdc94b643c
Reviewed-on: https://go-review.googlesource.com/c/go/+/227759
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Expand the methods for the FuncInfo helper, to support reading the
contents of an object file FuncInfo aux symbol using the new style
(that is to say, incrementally and without allocating slices to hold
the various bits).
Change-Id: I953d72c4a53f98c840e6b25b08fd33dc4a833dd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/227585
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Right now the Aux and AuxInt fields of ssa.Values are typed as
interface{} and int64, respectively. Each rule that uses these values
must cast them to the type they actually are (*obj.LSym, or int32, or
ValAndOff, etc.), use them, and then cast them back to interface{} or
int64.
We know for each opcode what the types of the Aux and AuxInt fields
should be. So let's modify the rule generator to declare the types to
be what we know they should be, autoconverting to and from the generic
types for us. That way we can make the rules more type safe.
It's difficult to make a single CL for this, so I've coopted the "=>"
token to indicate a rule that is strongly typed. "->" rules are
processed as before. That will let us migrate a few rules at a time in
separate CLs. Hopefully we can reach a state where all rules are
strongly typed and we can drop the distinction.
This CL changes just a few rules to get a feel for what this
transition would look like.
I've decided not to put explicit types in the rules. I think it
makes the rules somewhat clearer, but definitely more verbose.
In particular, the passthrough rules that don't modify the fields
in question are verbose for no real reason.
Change-Id: I63a1b789ac5702e7caf7934cd49f784235d1d73d
Reviewed-on: https://go-review.googlesource.com/c/go/+/190197
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This changes the code generated for variable length shift
counts to use isel instead of instructions that set and
read the carry flag.
This reduces the generated code for shifts like this
by 1 instruction and avoids the use of instructions to
set and read the carry flag.
This sequence can be found in strconv with these results
on power9:
Atof64Decimal 71.6ns ± 0% 68.3ns ± 0% -4.61%
Atof64Float 95.3ns ± 0% 90.9ns ± 0% -4.62%
Atof64FloatExp 153ns ± 0% 149ns ± 0% -2.61%
Atof64Big 234ns ± 0% 232ns ± 0% -0.85%
Atof64RandomBits 348ns ± 0% 369ns ± 0% +6.03%
Atof64RandomFloats 262ns ± 0% 262ns ± 0% ~
Atof32Decimal 72.0ns ± 0% 68.2ns ± 0% -5.28%
Atof32Float 92.1ns ± 0% 87.1ns ± 0% -5.43%
Atof32FloatExp 159ns ± 0% 158ns ± 0% -0.63%
Atof32Random 194ns ± 0% 191ns ± 0% -1.55%
Some tests in codegen/shift.go are enabled to verify the
expected instructions are generated.
Change-Id: I968715d10ada405a8c46132bf19b8ed9b85796d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/227337
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This is in prepration of removing the old loader.Reloc. This also
introduces a way of adding a slice of relocations more
efficiently (will be used in the next CL).
Change-Id: I3eaee7fb3a3e102a8670990f4a31c40d0b17b8c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/227761
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Tweak the runtime's GDB python test to try to reduce flake failures.
Background: the intent of the testpoint in question is to make sure
that python-supported commands like "info goroutines" or "goroutine 1
backtrace" work properly. The Go code being run under the debugger as
part of the test is single-threaded, but the test is written assuming
that in addition to the primary goroutine there will be other
background goroutines available (owned by the runtime). The flakiness
seems to crop up the most when requesting a backtrace for one of these
background goroutines; the speculation is that if we catch a
runtime-owned goroutine in an odd state, this could interfere with the
test.
The change in this patch is to explicitly start an additional
goroutine from the main thread, so that when the debugger stops the
main thread we can be sure that there is some other non-main goroutine
in a known state.
This change authored by Josh Bleecher Snyder <josharian@gmail.com>.
Updates #24616.
Change-Id: I45682323d5898e5187c0adada7c5d117e92f403b
Reviewed-on: https://go-review.googlesource.com/c/go/+/226558
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Also set a deadline in TestCloseWrite so that we can more easily
determine which kind of connection is getting stuck on the
darwin-arm64-corellium builder (#34837).
Change-Id: I8ccacbf436e8e493fb2298a79b17e0af8fc6eb81
Reviewed-on: https://go-review.googlesource.com/c/go/+/227588
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For map with hint larger than BUCKETSIZE, makemap ignore allocated
bucket and allocate buckets itself. So do not allocate bucket in
this case, save us the cost of zeroing+assignment to the bucket.
name old time/op new time/op delta
NewEmptyMap-12 3.89ns ± 4% 3.88ns ± 2% ~ (p=0.939 n=19+20)
NewSmallMap-12 23.3ns ± 3% 23.1ns ± 2% ~ (p=0.307 n=18+17)
NewEmptyMapHintLessThan8-12 6.43ns ± 3% 6.31ns ± 2% -1.72% (p=0.000 n=19+18)
NewEmptyMapHintGreaterThan8-12 159ns ± 2% 150ns ± 1% -5.79% (p=0.000 n=20+18)
Benchmark run with commit ab7c174 reverted, see #38314.
Fixes#20184
Change-Id: Ic021f57454c3a0dd50601d73bbd77b8faf8d93b6
Reviewed-on: https://go-review.googlesource.com/c/go/+/227458
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The previous change moved code around to create slicesym.
This change simplifies slicesym and its callsites
by accepting an int64 for lencap instead of a node,
and by removing all the calls to gdata.
It also stops modifying n,
which avoids the need to make a copy of it.
Passes toolstash-check.
Change-Id: I4d25454d11b4bb8941000244443e3c99eef4bdd0
Reviewed-on: https://go-review.googlesource.com/c/go/+/227550
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Some runtime calls accept a slice, but only use ptr and len.
This change modifies most such routines to accept only ptr and len.
After this change, the only runtime calls that accept an unnecessary
cap arg are concatstrings and slicerunetostring.
Neither is particularly common, and both are complicated to modify.
Negligible compiler performance impact. Shrinks binaries a little.
There are only a few regressions; the one I investigated was
due to register allocation fluctuation.
Passes 'go test -race std cmd', modulo #38265 and #38266.
Wow, does that take a long time to run.
Updates #36890
file before after Δ %
compile 19655024 19655152 +128 +0.001%
cover 5244840 5236648 -8192 -0.156%
dist 3662376 3658280 -4096 -0.112%
link 6680056 6675960 -4096 -0.061%
pprof 14789844 14777556 -12288 -0.083%
test2json 2824744 2820648 -4096 -0.145%
trace 11647876 11639684 -8192 -0.070%
vet 8260472 8256376 -4096 -0.050%
total 115163736 115118808 -44928 -0.039%
Change-Id: Idb29fa6a81d6a82bfd3b65740b98cf3275ca0a78
Reviewed-on: https://go-review.googlesource.com/c/go/+/227163
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Returning an URL.String() without the password is very useful for
situations where the URL is supposed to be logged and the password is
not useful to be shown.
This method re-uses URL.String() but with the password scrubbed and
substituted for a "xxxxx" in order to make it obvious that there was a
password. If the URL had no password then no "xxxxx" will be shown.
Fixes#34855
Change-Id: I7f17d81aa09a7963d2731d16fe15c6ae8e2285fc
GitHub-Last-Rev: 46d06dbc4f
GitHub-Pull-Request: golang/go#35578
Reviewed-on: https://go-review.googlesource.com/c/go/+/207082
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
The divBasic function computes the quotient of big nats u/v word by word.
It estimates each word qhat by performing a long division (top 2 words of u
divided by top word of v), looks at the next word to correct the estimate,
then perform a full multiplication (qhat*v) to catch any inaccuracy in the
estimate.
In the latter case, "negative" values appear temporarily and carries
must be carefully managed, and the recursive division refactoring
introduced a case where qhat*v has the same length as v, triggering an
out-of-bounds write in the case it happens when computing the top word
of the quotient.
Fixes#37499
Change-Id: I15089da4a4027beda43af497bf6de261eb792f94
Reviewed-on: https://go-review.googlesource.com/c/go/+/221980
Reviewed-by: Robert Griesemer <gri@golang.org>
The cgo build tag is not necessary for root_darwin_arm64.go. We can't
build for darwin/arm64 without cgo, and even if we did 1) this code
would work fine 2) the no-cgo code that shells out to
/usr/bin/security would not work.
(Suggested by Filippo.)
Change-Id: I98cac2ea96ec5ac1ae60b7e32d195d5e86e2bd66
Reviewed-on: https://go-review.googlesource.com/c/go/+/227583
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Adds a GOMODCACHE environment variable that's used by cmd/go to determine the
location of the module cache. The default value of GOMODCACHE will be
GOPATH[0]/pkg/mod, the default location of the module cache before this change.
Replace the cmd/go/internal/modfetch.PkgMod variable which previously held the
location of the module cache with the new cmd/go/internal/cfg.GOMODCACHE
variable, for consistency with many of the other environment variables that
affect the behavior of cmd/go. (Most of the changes in this CL are due to
moving/renaming the variable.)
The value of cfg.GOMODCACHE is now set using a variable initializer. It was
previously set in cmd/go/internal/modload.Init.
The location of GOPATH/pkg/sumdb is unchanged by this CL. While it was
previously determined using the value of PkgMod, it now is determined
independently dirctly from the value of GOPATH[0].
Fixes#34527
Change-Id: Id4d31d217b3507d6057c8ef7c52af1a0606603e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/219538
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Don't emit an error for undefined symbol in trampoline
generation pass, which will be duplicate as we'll emit a better
one later.
Fix TestUndefinedRelocErrors on PPC64.
Change-Id: I964d4bd63ec4b4c6eb5d98caf68db93ce6488bf5
Reviewed-on: https://go-review.googlesource.com/c/go/+/227617
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
TestPingPongHog tests properties of the scheduler.
But the race detector intentionally does randomized scheduling,
so the test is not applicable.
Fixes#38266
Change-Id: Ib06aa317b2776cb1faa641c4e038e2599cf70b2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/227344
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Implement text address assignment and trampoline generation using
the loader.
Note: the trampoline insertion part doesn't actually work. It
also needs to propagate Aux symbols for external symbols in
LoadFull. But it won't be needed after converting pclntab
generation, so I'll leave it out for now. This could break
linking large binaries on PPC64 and ARM.
Change-Id: Ie46a35b25d7c027983dd877207cfa8f67c32530b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227482
Reviewed-by: Than McIntosh <thanm@google.com>
SymFile, derived from sym.Symbol.File, is supposed to return the
package path, instead of the file name (arguably the name is
confusing). Make it so, and rename it to SymPkg.
Change-Id: I67bcd12f67cea271f2a2ce3c5724e5d228f5b2f0
Reviewed-on: https://go-review.googlesource.com/c/go/+/227481
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
TestTryAdd is particularly brittle because it tests some real cases by
constructing fake sample stack frames. If those frames don't correctly
represent what the runtime would generate then they may fail to catch
regressions.
Instead, call runtime.Callers at the bottom of real function calls to
generate real frames as a base for truncation, etc in tests. Several of
these tests still have to fake parts of the frames to test the right
thing, but this is a bit less fragile.
Change-Id: I62522a9ded5544b06d1bf28550af5400f3af667b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227484
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This change adds CFA information to the assembly function 'crosscall1'
and reorgnizes its code to establish well-formed prologue and epilogue.
It will fix an infinite callstack issue when debugging cgo program with
GDB on arm64.
Brief root cause analysis:
GDB's aarch64 unwinder parses prologue to determine current frame's size
and previous PC&SP if CFA information is not available.
The unwinder parses the prologue of 'crosscall1' to determine a frame size
of 0x10, then turns to its next frame trying to compute its previous PC&SP
as they are not saved on current frame's stack as per its 'traditional frame
unwind' rules, which ends up getting an endless frame chain like:
[callee] : pc:<pc0>, sp:<sp0>
crosscall1: pc:<pc1>, sp:<sp0>+0x10
[caller] : pc:<pc1>, sp:<sp0>+0x10+0x10
[caller] : pc:<pc1>, sp:<sp0>+0x10+0x10+0x10
...
GDB fails to detect the 'caller' frame is same as 'crosscall1' and terminate
unwinding since SP increases everytime.
Fixes#37238
Change-Id: Ia6bd8555828541a3a61f7dc9b94dfa00775ec52a
Reviewed-on: https://go-review.googlesource.com/c/go/+/226999
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
I took some of the infrastructure from Austin's lock logging CR
https://go-review.googlesource.com/c/go/+/192704 (with deadlock
detection from the logs), and developed a setup to give static lock
ranking for runtime locks.
Static lock ranking establishes a documented total ordering among locks,
and then reports an error if the total order is violated. This can
happen if a deadlock happens (by acquiring a sequence of locks in
different orders), or if just one side of a possible deadlock happens.
Lock ordering deadlocks cannot happen as long as the lock ordering is
followed.
Along the way, I found a deadlock involving the new timer code, which Ian fixed
via https://go-review.googlesource.com/c/go/+/207348, as well as two other
potential deadlocks.
See the constants at the top of runtime/lockrank.go to show the static
lock ranking that I ended up with, along with some comments. This is
great documentation of the current intended lock ordering when acquiring
multiple locks in the runtime.
I also added an array lockPartialOrder[] which shows and enforces the
current partial ordering among locks (which is embedded within the total
ordering). This is more specific about the dependencies among locks.
I don't try to check the ranking within a lock class with multiple locks
that can be acquired at the same time (i.e. check the ranking when
multiple hchan locks are acquired).
Currently, I am doing a lockInit() call to set the lock rank of most
locks. Any lock that is not otherwise initialized is assumed to be a
leaf lock (a very high rank lock), so that eliminates the need to do
anything for a bunch of locks (including all architecture-dependent
locks). For two locks, root.lock and notifyList.lock (only in the
runtime/sema.go file), it is not as easy to do lock initialization, so
instead, I am passing the lock rank with the lock calls.
For Windows compilation, I needed to increase the StackGuard size from
896 to 928 because of the new lock-rank checking functions.
Checking of the static lock ranking is enabled by setting
GOEXPERIMENT=staticlockranking before doing a run.
To make sure that the static lock ranking code has no overhead in memory
or CPU when not enabled by GOEXPERIMENT, I changed 'go build/install' so
that it defines a build tag (with the same name) whenever any experiment
has been baked into the toolchain (by checking Expstring()). This allows
me to avoid increasing the size of the 'mutex' type when static lock
ranking is not enabled.
Fixes#38029
Change-Id: I154217ff307c47051f8dae9c2a03b53081acd83a
Reviewed-on: https://go-review.googlesource.com/c/go/+/207619
Reviewed-by: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Extend CL 220417 (which removed the integer Greater and Geq ops) to
floating point comparisons. Greater and Geq can always be
implemented using Less and Leq.
Fixes#37316.
Change-Id: Ieaddb4877dd0ff9037a1dd11d0a9a9e45ced71e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/222397
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
In the commit message of CL 212360, I wrote:
> This new intrinsic ... generates MOVB+TESTB+NE.
> (It is possible that MOVBQZX+TESTQ+NE would be better.)
I should have tested. MOVBQZX+TESTQ+NE does in fact appear to be better.
For the benchmark in #36196, on my machine:
name old time/op new time/op delta
FMA-8 0.86ns ± 6% 0.70ns ± 5% -18.79% (p=0.000 n=98+97)
NonFMA-8 0.61ns ± 5% 0.60ns ± 4% -0.74% (p=0.001 n=100+97)
Interestingly, these are both considerably faster than
the measurements I took a couple of months ago (1.4ns/2ns).
It appears that CL 219131 (clearing VZEROUPPER in asyncPreempt) helped a lot.
And FMA is now once again slower than NonFMA, although this change
helps it regain some ground.
Updates #15808
Updates #36351
Updates #36196
Change-Id: I8a326289a963b1939aaa7eaa2fab2ec536467c7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/227238
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
The test was not preserving temporary directory flags leading to a
failure on windows with:
mkdir C:\WINDOWS\go-build315158903: Access is denied.
Fixes#38251
Change-Id: I6ee31b31e84b7f6e75ea6ee0f3b8c094835bf5d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/227497
Reviewed-by: David Chase <drchase@google.com>
The code in setArchsyms that sets up TOC symbols was buggy; it was
kicking in only for aix-ppc64 and not linux-ppc64. These symbols are
required for both ABIs, so change the guard in question from
"ctx.IsAIX()" to "ctxt.IsPPC64()". Also, the code to create versioned
".TOC." syms was not passing the correct symbol version to the loader
(now fixed).
Change-Id: I356071e528beadad20f61d067059eaf26f06e06b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227257
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
On s390x, we already have MVCIN opcode in asmz.go,
but we did not use it. This CL uses that opcode and adds MVCIN
instruction.
MVCIN instruction can be used to move data from one storage location
to another while reversing the order of bytes within the field. This
could be useful when transforming data from little-endian to big-endian.
Change-Id: Ifa1a911c0d3442f4a62f91f74ed25b196d01636b
Reviewed-on: https://go-review.googlesource.com/c/go/+/227478
Reviewed-by: Michael Munday <mike.munday@ibm.com>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Remove some extra sanity-checking code from the loader's RelocVariant
method, since it was yielding a slowdown of 1-2% linking kubernetes
hyperkube (once again a reminder that relocation processing is a very
performance-sensitive part of the linker).
Change-Id: Ifbc0662f3f96c5f54131103ce6f7439ecfb9b9dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/227477
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Add support to the loader for getting/setting the 'variant' property
of a symbol relocation. The variant property handles unusual or
infrequently used relocations that have both a type and a variant of
that type (this is needed for S390).
In the sym.Symbol world, a relocation variant is a field on the
'relocExt' extension that is part of sym.Reloc. In this new
implementation for the loader, reloc variants are stored in a side
table (a map) in the loader, and accessed via loader methods.
Change-Id: I62bf54ae7ff6d500c0ea8d2dbe759b2431087378
Reviewed-on: https://go-review.googlesource.com/c/go/+/227018
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Begin the job of converting the linker's "gentext" phase over to use
loader APIs. This patch includes most architectures except for s390x
and PPC (these will be added in subsequent patches, since they require
a couple of loader changes first).
Change-Id: Ic7f55c207dcdbbba657330ef007a72ff7c837416
Reviewed-on: https://go-review.googlesource.com/c/go/+/227017
Reviewed-by: Jeremy Faller <jeremy@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2020-04-06 14:56:10 +00:00
3513 changed files with 242171 additions and 287136 deletions
Since slices, arrays and strings are not C pointers, GDB can't interpret the subscripting operation for you, but
you can look inside the runtime representation to do that (tab completion helps here):
</p>
<pre>
(gdb) <b>p slc</b>
$11 = []int = {0, 0}
(gdb) <b>p slc-></b><i><TAB></i>
array slc len
(gdb) <b>p slc->array</b>
$12 = (int *) 0xf84057af00
(gdb) <b>p slc->array[1]</b>
$13 = 0</pre>
<p>
The extension functions $len and $cap work on strings, arrays and slices:
</p>
<pre>
(gdb) <b>p $len(utf)</b>
$23 = 4
(gdb) <b>p $cap(utf)</b>
$24 = 4
</pre>
<p>
Channels and maps are 'reference' types, which gdb shows as pointers to C++-like types <code>hash<int,string>*</code>. Dereferencing will trigger prettyprinting
</p>
<p>
Interfaces are represented in the runtime as a pointer to a type descriptor and a pointer to a value. The Go GDB runtime extension decodes this and automatically triggers pretty printing for the runtime type. The extension function <code>$dtype</code> decodes the dynamic type for you (examples are taken from a breakpoint at <code>regexp.go</code> line 293.)
One minor detail of the default formatting of Go source code has changed.
When formatting expression lists with inline comments, the comments were
aligned according to a heuristic.
However, in some cases the alignment would be split up too easily, or
introduce too much whitespace.
The heuristic has been changed to behave better for human-written code.
</p>
<p>
Note that these kinds of minor updates to gofmt are expected from time to
time.
In general, systems that need consistent formatting of Go source code should
use a specific version of the <code>gofmt</code> binary.
See the <ahref="/pkg/go/format/">go/format</a> package documentation for more
information.
</p>
<h3id="run">Run</h3>
<p>
<!-- CL 109341 -->
The <ahref="/cmd/go/"><code>go</code> <code>run</code></a>
command now allows a single import path, a directory name or a
pattern matching a single package.
This allows <code>go</code> <code>run</code> <code>pkg</code> or <code>go</code> <code>run</code> <code>dir</code>, most importantly <code>go</code> <code>run</code> <code>.</code>
</p>
<h2id="runtime">Runtime</h2>
<p><!-- CL 85887 -->
The runtime now uses a sparse heap layout so there is no longer a
limit to the size of the Go heap (previously, the limit was 512GiB).
This also fixes rare "address space conflict" failures in mixed Go/C
binaries or binaries compiled with <code>-race</code>.
</p>
<p><!-- CL 108679, CL 106156 -->
On macOS and iOS, the runtime now uses <code>libSystem.dylib</code> instead of
calling the kernel directly. This should make Go binaries more
compatible with future versions of macOS and iOS.
The <ahref="/pkg/syscall">syscall</a> package still makes direct
system calls; fixing this is planned for a future release.
</p>
<h2id="performance">Performance</h2>
<p>
As always, the changes are so general and varied that precise
statements about performance are difficult to make. Most programs
should run a bit faster, due to better generated code and
optimizations in the core library.
</p>
<p><!-- CL 74851 -->
There were multiple performance changes to the <code>math/big</code>
package as well as many changes across the tree specific to <code>GOARCH=arm64</code>.
The compiler now performs significantly more aggressive bounds-check
and branch elimination. Notably, it now recognizes transitive
relations, so if <code>i<j</code> and <code>j<len(s)</code>,
it can use these facts to eliminate the bounds check
for <code>s[i]</code>. It also understands simple arithmetic such
as <code>s[i-10]</code> and can recognize more inductive cases in
loops. Furthermore, the compiler now uses bounds information to more
aggressively optimize shift operations.
</p>
<h2id="library">Core library</h2>
<p>
All of the changes to the standard library are minor.
</p>
<h3id="minor_library_changes">Minor changes to the library</h3>
<p>
As always, there are various minor changes and updates to the library,
made with the Go 1 <ahref="/doc/go1compat">promise of compatibility</a>
in mind.
</p>
<!-- CL 115095: https://golang.org/cl/115095: yes (`go test pkg` now always builds pkg even if there are no test files): cmd/go: output coverage report even if there are no test files -->
<!-- CL 110395: https://golang.org/cl/110395: cmd/go, cmd/compile: use Windows response files to avoid arg length limits -->
<!-- CL 112436: https://golang.org/cl/112436: cmd/pprof: add readline support similar to upstream -->
<ahref="/pkg/math/big/#Int.ModInverse"><code>ModInverse</code></a> now returns nil when g and n are not relatively prime. The result was previously undefined.
NOTE: In this document and others in this directory, the convention is to
set fixed-width phrases with non-fixed-width spaces, as in
<code>hello</code> <code>world</code>.
Do not send CLs removing the interior tags from such phrases.
-->
<style>
mainulli{margin:0.5em0;}
</style>
<h2id="introduction">Introduction to Go 1.12</h2>
<p>
The latest Go release, version 1.12, arrives six months after <ahref="go1.11">Go 1.11</a>.
Most of its changes are in the implementation of the toolchain, runtime, and libraries.
As always, the release maintains the Go 1 <ahref="/doc/go1compat">promise of compatibility</a>.
We expect almost all Go programs to continue to compile and run as before.
</p>
<h2id="language">Changes to the language</h2>
<p>
There are no changes to the language specification.
</p>
<h2id="ports">Ports</h2>
<p><!-- CL 138675 -->
The race detector is now supported on <code>linux/arm64</code>.
</p>
<pid="freebsd">
Go 1.12 is the last release that is supported on FreeBSD 10.x, which has
already reached end-of-life. Go 1.13 will require FreeBSD 11.2+ or FreeBSD
12.0+.
FreeBSD 12.0+ requires a kernel with the COMPAT_FREEBSD11 option set (this is the default).
</p>
<p><!-- CL 146898 -->
cgo is now supported on <code>linux/ppc64</code>.
</p>
<pid="hurd"><!-- CL 146023 -->
<code>hurd</code> is now a recognized value for <code>GOOS</code>, reserved
for the GNU/Hurd system for use with <code>gccgo</code>.
</p>
<h3id="windows">Windows</h3>
<p>
Go's new <code>windows/arm</code> port supports running Go on Windows 10
IoT Core on 32-bit ARM chips such as the Raspberry Pi 3.
</p>
<h3id="aix">AIX</h3>
<p>
Go now supports AIX 7.2 and later on POWER8 architectures (<code>aix/ppc64</code>). External linking, cgo, pprof and the race detector aren't yet supported.
</p>
<h3id="darwin">Darwin</h3>
<p>
Go 1.12 is the last release that will run on macOS 10.10 Yosemite.
Go 1.13 will require macOS 10.11 El Capitan or later.
</p>
<p><!-- CL 141639 -->
<code>libSystem</code> is now used when making syscalls on Darwin,
ensuring forward-compatibility with future versions of macOS and iOS.
<!-- CL 153338 -->
The switch to <code>libSystem</code> triggered additional App Store
checks for private API usage. Since it is considered private,
<code>syscall.Getdirentries</code> now always fails with
New extended precision operations <ahref="/pkg/math/bits/#Add"><code>Add</code></a>, <ahref="/pkg/math/bits/#Sub"><code>Sub</code></a>, <ahref="/pkg/math/bits/#Mul"><code>Mul</code></a>, and <ahref="/pkg/math/bits/#Div"><code>Div</code></a> are available in <code>uint</code>, <code>uint32</code>, and <code>uint64</code> versions.
</p>
</dl><!-- math/bits -->
<dlid="net"><dt><ahref="/pkg/net/">net</a></dt>
<dd>
<p><!-- CL 146659 -->
The
<ahref="/pkg/net/#Dialer.DualStack"><code>Dialer.DualStack</code></a> setting is now ignored and deprecated;
RFC 6555 Fast Fallback ("Happy Eyeballs") is now enabled by default. To disable, set
<ahref="/pkg/net/#Dialer.FallbackDelay"><code>Dialer.FallbackDelay</code></a> to a negative value.
</p>
<p><!-- CL 107196 -->
Similarly, TCP keep-alives are now enabled by default if
<ahref="/pkg/net/#Dialer.KeepAlive"><code>Dialer.KeepAlive</code></a> is zero.
To disable, set it to a negative value.
</p>
<p><!-- CL 113997 -->
On Linux, the <ahref="http://man7.org/linux/man-pages/man2/splice.2.html"><code>splice</code> system call</a> is now used when copying from a
<ahref="/pkg/net/#UnixConn"><code>UnixConn</code></a> to a
The <ahref="/cmd/go/#hdr-Testing_flags"><code>-benchtime</code></a> flag now supports setting an explicit iteration count instead of a time when the value ends with an "<code>x</code>". For example, <code>-benchtime=100x</code> runs the benchmark 100 times.
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