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cmd/compile: don't put Noalg types in typelinks
They could get picked up by reflect code, yielding the wrong type. Fixes #22605 Change-Id: Ie11fb361ca7f3255e662037b3407565c8f0a2c4c Reviewed-on: https://go-review.googlesource.com/76315 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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@ -960,10 +960,17 @@ func dcommontype(lsym *obj.LSym, ot int, t *types.Type) int {
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return ot
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}
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// typeHasNoAlg returns whether t does not have any associated hash/eq
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// algorithms because t, or some component of t, is marked Noalg.
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func typeHasNoAlg(t *types.Type) bool {
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a, bad := algtype1(t)
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return a == ANOEQ && bad.Noalg()
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}
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func typesymname(t *types.Type) string {
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name := t.ShortString()
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// Use a separate symbol name for Noalg types for #17752.
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if a, bad := algtype1(t); a == ANOEQ && bad.Noalg() {
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if typeHasNoAlg(t) {
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name = "noalg." + name
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}
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return name
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@ -1394,6 +1401,10 @@ func dtypesym(t *types.Type) *obj.LSym {
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keep = true
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}
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}
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// Do not put Noalg types in typelinks. See issue #22605.
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if typeHasNoAlg(t) {
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keep = false
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}
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lsym.Set(obj.AttrMakeTypelink, keep)
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return lsym
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26
test/fixedbugs/issue22605.go
Normal file
26
test/fixedbugs/issue22605.go
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@ -0,0 +1,26 @@
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// run
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// We were picking up a special noalg type from typelinks.
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package main
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import "reflect"
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func f(m map[string]int) int {
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return m["a"]
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}
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func g(m map[[8]string]int) int {
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t := reflect.ArrayOf(8, reflect.TypeOf(""))
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a := reflect.New(t).Elem()
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return m[a.Interface().([8]string)]
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}
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func main() {
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m := map[[8]string]int{}
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g(m)
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}
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