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cmd/compile: prevent Noalg from breaking user types
Use a separate symbol for reflect metadata for types with Noalg set. Fixes #17752. Change-Id: Icb6cade7e3004fc4108f67df61105dc4085cd7e2 Reviewed-on: https://go-review.googlesource.com/32679 Reviewed-by: David Crawshaw <crawshaw@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -928,7 +928,14 @@ func dcommontype(s *Sym, ot int, t *Type) int {
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}
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func typesym(t *Type) *Sym {
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return Pkglookup(t.tconv(FmtLeft), typepkg)
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name := t.tconv(FmtLeft)
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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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name = "noalg." + name
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}
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return Pkglookup(name, typepkg)
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}
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// tracksym returns the symbol for tracking use of field/method f, assumed
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@ -1785,7 +1785,6 @@ func mkdotargslice(lr0, nn []*Node, l *Field, fp int, init *Nodes, ddd *Node) []
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}
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tslice := typSlice(l.Type.Elem())
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tslice.Noalg = true
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var n *Node
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if len(lr0) == 0 {
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20
test/fixedbugs/issue17752.go
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20
test/fixedbugs/issue17752.go
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@ -0,0 +1,20 @@
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// run
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// Copyright 2016 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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package main
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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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return m[[8]string{"a", "a", "a", "a", "a", "a", "a", "a"}]
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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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