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cmd/compile: fix ICE in reporting of invalid recursive types

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asNode(t.Nod).Name.Param will be nil for builtin types (i.e., the
universal predeclared types and unsafe.Pointer). These types can't be
part of a cycle anyway, so we can just skip them.

Fixes #42075.

Change-Id: Ic7a44de65c6bfd16936545dee25e36de8850acf3
Reviewed-on: https://go-review.googlesource.com/c/go/+/263717
Trust: Matthew Dempsky <mdempsky@google.com>
Trust: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This commit is contained in:
Matthew Dempsky 2020-10-19 14:14:40 -07:00
parent 5647d01ab7
commit c216ae80c9
2 changed files with 17 additions and 1 deletions
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2
src/cmd/compile/internal/gc/align.go
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@ -199,7 +199,7 @@ func findTypeLoop(t *types.Type, path *[]*types.Type) bool {
}
*path = append(*path, t)
if findTypeLoop(asNode(t.Nod).Name.Param.Ntype.Type, path) {
if p := asNode(t.Nod).Name.Param; p != nil && findTypeLoop(p.Ntype.Type, path) {
return true
}
*path = (*path)[:len(*path)-1]