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[dev.typeparams] go/types: support local defined types
This is a port of CL 327170 to go/types. Tests were not ported; they can be added later. Change-Id: Ic9fd681ac06dd187c1715efaf882b11353bc395a Reviewed-on: https://go-review.googlesource.com/c/go/+/335113 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>
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@ -428,14 +428,19 @@ func (subst *subster) typ(typ Type) Type {
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return typ
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}
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var instanceHashing = 0
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// TODO(gri) Eventually, this should be more sophisticated.
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// It won't work correctly for locally declared types.
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func instantiatedHash(typ *Named, targs []Type) string {
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assert(instanceHashing == 0)
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instanceHashing++
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var buf bytes.Buffer
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writeTypeName(&buf, typ.obj, nil)
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buf.WriteByte('[')
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writeTypeList(&buf, targs, nil, nil)
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buf.WriteByte(']')
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instanceHashing--
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// With respect to the represented type, whether a
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// type is fully expanded or stored as instance
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@ -348,17 +348,33 @@ func writeTParamList(buf *bytes.Buffer, list []*TypeName, qf Qualifier, visited
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}
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func writeTypeName(buf *bytes.Buffer, obj *TypeName, qf Qualifier) {
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s := "<Named w/o object>"
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if obj != nil {
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if obj.pkg != nil {
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writePackage(buf, obj.pkg, qf)
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}
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// TODO(gri): function-local named types should be displayed
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// differently from named types at package level to avoid
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// ambiguity.
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s = obj.name
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if obj == nil {
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buf.WriteString("<Named w/o object>")
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return
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}
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if obj.pkg != nil {
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writePackage(buf, obj.pkg, qf)
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}
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buf.WriteString(obj.name)
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if instanceHashing != 0 {
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// For local defined types, use the (original!) TypeName's position
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// to disambiguate. This is overkill, and could probably instead
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// just be the pointer value (if we assume a non-moving GC) or
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// a unique ID (like cmd/compile uses). But this works for now,
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// and is convenient for debugging.
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// TODO(mdempsky): I still don't fully understand why typ.orig.orig
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// can differ from typ.orig, or whether looping more than twice is
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// ever necessary.
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typ := obj.typ.(*Named)
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for typ.orig != typ {
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typ = typ.orig
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}
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if orig := typ.obj; orig.pkg != nil && orig.parent != orig.pkg.scope {
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fmt.Fprintf(buf, "@%q", orig.pos)
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}
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}
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buf.WriteString(s)
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}
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func writeTuple(buf *bytes.Buffer, tup *Tuple, variadic bool, qf Qualifier, visited []Type) {
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