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[dev.typeparams] cmd/compile: fail early on unexpected types2.Invalid

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In unified IR, fail right away if we find a types2.Invalid while
writing out the package. This provides a clearer error message for
https://github.com/golang/go/issues/25838#issuecomment-448746670.

Updates #25838.

Change-Id: I6902fdd891fc31bbb832b6fdba00eca301282409
Reviewed-on: https://go-review.googlesource.com/c/go/+/338973
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2021-08-02 18:01:46 -07:00
parent e56234a305
commit 1b193598b3
1 changed files with 13 additions and 9 deletions
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22
src/cmd/compile/internal/noder/writer.go
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@ -282,19 +282,23 @@ func (pw *pkgWriter) typIdx(typ types2.Type, dict *writerDict) typeInfo {
base.Fatalf("unexpected type: %v (%T)", typ, typ)
case *types2.Basic:
if kind := typ.Kind(); types2.Typ[kind] == typ {
switch kind := typ.Kind(); {
case kind == types2.Invalid:
base.Fatalf("unexpected types2.Invalid")
case types2.Typ[kind] == typ:
w.code(typeBasic)
w.len(int(kind))
break
default:
// Handle "byte" and "rune" as references to their TypeName.
obj := types2.Universe.Lookup(typ.Name())
assert(obj.Type() == typ)
w.code(typeNamed)
w.obj(obj, nil)
}
// Handle "byte" and "rune" as references to their TypeName.
obj := types2.Universe.Lookup(typ.Name())
assert(obj.Type() == typ)
w.code(typeNamed)
w.obj(obj, nil)
case *types2.Named:
// Type aliases can refer to uninstantiated generic types, so we
// might see len(TParams) != 0 && len(TArgs) == 0 here.