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[dev.typeparams] go/types: simplify Interface accessors

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This is a straightforward port of CL 321850 to go/types.

Change-Id: I719c19b8839390fdfa961255c6f1e79561cda6e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/324757
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Rob Findley 2021-06-03 11:55:11 -04:00 committed by Robert Findley
parent 2f26adc232
commit 7497e57a39
1 changed files with 12 additions and 50 deletions
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62
src/go/types/type.go
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@ -421,79 +421,41 @@ func (t *Interface) EmbeddedType(i int) Type { return t.embeddeds[i] }
// NumMethods returns the total number of methods of interface t.
// The interface must have been completed.
func (t *Interface) NumMethods() int { t.assertCompleteness(); return len(t.allMethods) }
func (t *Interface) assertCompleteness() {
if t.allMethods == nil {
panic("interface is incomplete")
}
}
func (t *Interface) NumMethods() int { t.Complete(); return len(t.allMethods) }
// Method returns the i'th method of interface t for 0 <= i < t.NumMethods().
// The methods are ordered by their unique Id.
// The interface must have been completed.
func (t *Interface) Method(i int) *Func { t.assertCompleteness(); return t.allMethods[i] }
func (t *Interface) Method(i int) *Func { t.Complete(); return t.allMethods[i] }
// Empty reports whether t is the empty interface.
func (t *Interface) Empty() bool {
if t.allMethods != nil {
// interface is complete - quick test
// A non-nil allTypes may still be empty and represents the bottom type.
return len(t.allMethods) == 0 && t.allTypes == nil
}
return !t.iterate(func(t *Interface) bool {
return len(t.methods) > 0 || t.types != nil
}, nil)
t.Complete()
// A non-nil allTypes may still have length 0 but represents the bottom type.
return len(t.allMethods) == 0 && t.allTypes == nil
}
// _HasTypeList reports whether interface t has a type list, possibly from an embedded type.
func (t *Interface) _HasTypeList() bool {
if t.allMethods != nil {
// interface is complete - quick test
return t.allTypes != nil
}
return t.iterate(func(t *Interface) bool {
return t.types != nil
}, nil)
t.Complete()
return t.allTypes != nil
}
// _IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
func (t *Interface) _IsComparable() bool {
if t.allMethods != nil {
// interface is complete - quick test
_, m := lookupMethod(t.allMethods, nil, "==")
return m != nil
}
return t.iterate(func(t *Interface) bool {
_, m := lookupMethod(t.methods, nil, "==")
return m != nil
}, nil)
t.Complete()
_, m := lookupMethod(t.allMethods, nil, "==")
return m != nil
}
// _IsConstraint reports t.HasTypeList() || t.IsComparable().
func (t *Interface) _IsConstraint() bool {
if t.allMethods != nil {
// interface is complete - quick test
if t.allTypes != nil {
return true
}
_, m := lookupMethod(t.allMethods, nil, "==")
return m != nil
}
return t.iterate(func(t *Interface) bool {
if t.types != nil {
return true
}
_, m := lookupMethod(t.methods, nil, "==")
return m != nil
}, nil)
return t._HasTypeList() || t._IsComparable()
}
// iterate calls f with t and then with any embedded interface of t, recursively, until f returns true.
// iterate reports whether any call to f returned true.
// TODO(rfindley) This is now only used by infer.go - see if we can eliminate it.
func (t *Interface) iterate(f func(*Interface) bool, seen map[*Interface]bool) bool {
if f(t) {
return true