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[dev.typeparams] cmd/compile/internal/types2: simplify Interface accessors
Change-Id: Ia97cf88d94de044d61ce2bd364a858bd608c050a Reviewed-on: https://go-review.googlesource.com/c/go/+/321850 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -427,79 +427,41 @@ func (t *Interface) EmbeddedType(i int) Type { return t.embeddeds[i] }
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// NumMethods returns the total number of methods of interface t.
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// The interface must have been completed.
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func (t *Interface) NumMethods() int { t.assertCompleteness(); return len(t.allMethods) }
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func (t *Interface) assertCompleteness() {
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if t.allMethods == nil {
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panic("interface is incomplete")
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}
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}
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func (t *Interface) NumMethods() int { t.Complete(); return len(t.allMethods) }
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// Method returns the i'th method of interface t for 0 <= i < t.NumMethods().
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// The methods are ordered by their unique Id.
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// The interface must have been completed.
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func (t *Interface) Method(i int) *Func { t.assertCompleteness(); return t.allMethods[i] }
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func (t *Interface) Method(i int) *Func { t.Complete(); return t.allMethods[i] }
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// Empty reports whether t is the empty interface.
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func (t *Interface) Empty() bool {
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if t.allMethods != nil {
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// interface is complete - quick test
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// A non-nil allTypes may still be empty and represents the bottom type.
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t.Complete()
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// A non-nil allTypes may still have length 0 but represents the bottom type.
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return len(t.allMethods) == 0 && t.allTypes == nil
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}
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return !t.iterate(func(t *Interface) bool {
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return len(t.methods) > 0 || t.types != nil
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}, nil)
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}
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// HasTypeList reports whether interface t has a type list, possibly from an embedded type.
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func (t *Interface) HasTypeList() bool {
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if t.allMethods != nil {
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// interface is complete - quick test
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t.Complete()
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return t.allTypes != nil
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}
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return t.iterate(func(t *Interface) bool {
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return t.types != nil
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}, nil)
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}
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// IsComparable reports whether interface t is or embeds the predeclared interface "comparable".
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func (t *Interface) IsComparable() bool {
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if t.allMethods != nil {
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// interface is complete - quick test
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t.Complete()
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_, m := lookupMethod(t.allMethods, nil, "==")
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return m != nil
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}
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return t.iterate(func(t *Interface) bool {
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_, m := lookupMethod(t.methods, nil, "==")
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return m != nil
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}, nil)
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}
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// IsConstraint reports t.HasTypeList() || t.IsComparable().
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func (t *Interface) IsConstraint() bool {
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if t.allMethods != nil {
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// interface is complete - quick test
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if t.allTypes != nil {
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return true
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}
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_, m := lookupMethod(t.allMethods, nil, "==")
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return m != nil
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}
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return t.iterate(func(t *Interface) bool {
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if t.types != nil {
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return true
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}
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_, m := lookupMethod(t.methods, nil, "==")
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return m != nil
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}, nil)
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return t.HasTypeList() || t.IsComparable()
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}
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// iterate calls f with t and then with any embedded interface of t, recursively, until f returns true.
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// iterate reports whether any call to f returned true.
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// TODO(gri) This is now only used by infer.go - see if we can eliminate it.
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func (t *Interface) iterate(f func(*Interface) bool, seen map[*Interface]bool) bool {
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if f(t) {
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return true
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