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cmd/compile/internal/types2: don't export TypeSet

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For now don't export TypeSet in the interest of
keeping the types2 API surface small(er).

This is a clean port of CL 341289 from go/types.

Change-Id: I50c747629f25472f2ec5ba59d7f543ee3c1c423b
Reviewed-on: https://go-review.googlesource.com/c/go/+/344610
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Robert Griesemer
2021-08-23 16:25:37 -07:00
parent d70c69d830
commit bba460499c
5 changed files with 29 additions and 29 deletions
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4
src/cmd/compile/internal/types2/interface.go
View File

@@ -17,11 +17,11 @@ type Interface struct {
embedPos *[]syntax.Pos // positions of embedded elements; or nil (for error messages) - use pointer to save space
complete bool // indicates that all fields (except for tset) are set up
tset *TypeSet // type set described by this interface, computed lazily
tset *_TypeSet // type set described by this interface, computed lazily
}
// typeSet returns the type set for interface t.
func (t *Interface) typeSet() *TypeSet { return computeInterfaceTypeSet(nil, nopos, t) }
func (t *Interface) typeSet() *_TypeSet { return computeInterfaceTypeSet(nil, nopos, t) }
// emptyInterface represents the empty interface
var emptyInterface = Interface{complete: true, tset: &topTypeSet}

2
src/cmd/compile/internal/types2/sizeof_test.go
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@@ -49,7 +49,7 @@ func TestSizeof(t *testing.T) {
// Misc
{Scope{}, 60, 104},
{Package{}, 40, 80},
{TypeSet{}, 28, 56},
{_TypeSet{}, 28, 56},
}
for _, test := range tests {

46
src/cmd/compile/internal/types2/typeset.go
View File

@@ -14,8 +14,8 @@ import (
// ----------------------------------------------------------------------------
// API
// A TypeSet represents the type set of an interface.
type TypeSet struct {
// A _TypeSet represents the type set of an interface.
type _TypeSet struct {
comparable bool // if set, the interface is or embeds comparable
// TODO(gri) consider using a set for the methods for faster lookup
methods []*Func // all methods of the interface; sorted by unique ID
@@ -23,20 +23,20 @@ type TypeSet struct {
}
// IsEmpty reports whether type set s is the empty set.
func (s *TypeSet) IsEmpty() bool { return s.terms.isEmpty() }
func (s *_TypeSet) IsEmpty() bool { return s.terms.isEmpty() }
// IsAll reports whether type set s is the set of all types (corresponding to the empty interface).
func (s *TypeSet) IsAll() bool {
func (s *_TypeSet) IsAll() bool {
return !s.comparable && len(s.methods) == 0 && s.terms.isAll()
}
// TODO(gri) IsMethodSet is not a great name for this predicate. Find a better one.
// IsMethodSet reports whether the type set s is described by a single set of methods.
func (s *TypeSet) IsMethodSet() bool { return !s.comparable && s.terms.isAll() }
func (s *_TypeSet) IsMethodSet() bool { return !s.comparable && s.terms.isAll() }
// IsComparable reports whether each type in the set is comparable.
func (s *TypeSet) IsComparable() bool {
func (s *_TypeSet) IsComparable() bool {
if s.terms.isAll() {
return s.comparable
}
@@ -48,24 +48,24 @@ func (s *TypeSet) IsComparable() bool {
// TODO(gri) IsTypeSet is not a great name for this predicate. Find a better one.
// IsTypeSet reports whether the type set s is represented by a finite set of underlying types.
func (s *TypeSet) IsTypeSet() bool {
func (s *_TypeSet) IsTypeSet() bool {
return !s.comparable && len(s.methods) == 0
}
// NumMethods returns the number of methods available.
func (s *TypeSet) NumMethods() int { return len(s.methods) }
func (s *_TypeSet) NumMethods() int { return len(s.methods) }
// Method returns the i'th method of type set s for 0 <= i < s.NumMethods().
// The methods are ordered by their unique ID.
func (s *TypeSet) Method(i int) *Func { return s.methods[i] }
func (s *_TypeSet) Method(i int) *Func { return s.methods[i] }
// LookupMethod returns the index of and method with matching package and name, or (-1, nil).
func (s *TypeSet) LookupMethod(pkg *Package, name string) (int, *Func) {
func (s *_TypeSet) LookupMethod(pkg *Package, name string) (int, *Func) {
// TODO(gri) s.methods is sorted - consider binary search
return lookupMethod(s.methods, pkg, name)
}
func (s *TypeSet) String() string {
func (s *_TypeSet) String() string {
switch {
case s.IsEmpty():
return "∅"
@@ -105,16 +105,16 @@ func (s *TypeSet) String() string {
// ----------------------------------------------------------------------------
// Implementation
func (s *TypeSet) hasTerms() bool { return !s.terms.isAll() }
func (s *TypeSet) structuralType() Type { return s.terms.structuralType() }
func (s *TypeSet) includes(t Type) bool { return s.terms.includes(t) }
func (s1 *TypeSet) subsetOf(s2 *TypeSet) bool { return s1.terms.subsetOf(s2.terms) }
func (s *_TypeSet) hasTerms() bool { return !s.terms.isAll() }
func (s *_TypeSet) structuralType() Type { return s.terms.structuralType() }
func (s *_TypeSet) includes(t Type) bool { return s.terms.includes(t) }
func (s1 *_TypeSet) subsetOf(s2 *_TypeSet) bool { return s1.terms.subsetOf(s2.terms) }
// TODO(gri) TypeSet.is and TypeSet.underIs should probably also go into termlist.go
var topTerm = term{false, theTop}
func (s *TypeSet) is(f func(*term) bool) bool {
func (s *_TypeSet) is(f func(*term) bool) bool {
if len(s.terms) == 0 {
return false
}
@@ -133,7 +133,7 @@ func (s *TypeSet) is(f func(*term) bool) bool {
return true
}
func (s *TypeSet) underIs(f func(Type) bool) bool {
func (s *_TypeSet) underIs(f func(Type) bool) bool {
if len(s.terms) == 0 {
return false
}
@@ -158,10 +158,10 @@ func (s *TypeSet) underIs(f func(Type) bool) bool {
}
// topTypeSet may be used as type set for the empty interface.
var topTypeSet = TypeSet{terms: allTermlist}
var topTypeSet = _TypeSet{terms: allTermlist}
// computeInterfaceTypeSet may be called with check == nil.
func computeInterfaceTypeSet(check *Checker, pos syntax.Pos, ityp *Interface) *TypeSet {
func computeInterfaceTypeSet(check *Checker, pos syntax.Pos, ityp *Interface) *_TypeSet {
if ityp.tset != nil {
return ityp.tset
}
@@ -197,7 +197,7 @@ func computeInterfaceTypeSet(check *Checker, pos syntax.Pos, ityp *Interface) *T
// have valid interfaces. Mark the interface as complete to avoid
// infinite recursion if the validType check occurs later for some
// reason.
ityp.tset = &TypeSet{terms: allTermlist} // TODO(gri) is this sufficient?
ityp.tset = &_TypeSet{terms: allTermlist} // TODO(gri) is this sufficient?
// Methods of embedded interfaces are collected unchanged; i.e., the identity
// of a method I.m's Func Object of an interface I is the same as that of
@@ -347,17 +347,17 @@ func (a byUniqueMethodName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
// invalidTypeSet is a singleton type set to signal an invalid type set
// due to an error. It's also a valid empty type set, so consumers of
// type sets may choose to ignore it.
var invalidTypeSet TypeSet
var invalidTypeSet _TypeSet
// computeUnionTypeSet may be called with check == nil.
// The result is &invalidTypeSet if the union overflows.
func computeUnionTypeSet(check *Checker, pos syntax.Pos, utyp *Union) *TypeSet {
func computeUnionTypeSet(check *Checker, pos syntax.Pos, utyp *Union) *_TypeSet {
if utyp.tset != nil {
return utyp.tset
}
// avoid infinite recursion (see also computeInterfaceTypeSet)
utyp.tset = new(TypeSet)
utyp.tset = new(_TypeSet)
var allTerms termlist
for _, t := range utyp.terms {

4
src/cmd/compile/internal/types2/union.go
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@@ -11,8 +11,8 @@ import "cmd/compile/internal/syntax"
// A Union represents a union of terms embedded in an interface.
type Union struct {
terms []*Term // list of syntactical terms (not a canonicalized termlist)
tset *TypeSet // type set described by this union, computed lazily
terms []*Term // list of syntactical terms (not a canonicalized termlist)
tset *_TypeSet // type set described by this union, computed lazily
}
// NewUnion returns a new Union type with the given terms.

2
src/cmd/compile/internal/types2/universe.go
View File

@@ -99,7 +99,7 @@ func defPredeclaredTypes() {
{
obj := NewTypeName(nopos, nil, "comparable", nil)
obj.setColor(black)
ityp := &Interface{obj, nil, nil, nil, true, &TypeSet{true, nil, allTermlist}}
ityp := &Interface{obj, nil, nil, nil, true, &_TypeSet{true, nil, allTermlist}}
NewNamed(obj, ityp, nil)
def(obj)
}