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reflect: make Value.Interface return immutable data

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Fixes #3134.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5713049
This commit is contained in:
Russ Cox 2012-03-01 11:48:27 -05:00
parent dc159fabff
commit a72b87efa9
2 changed files with 22 additions and 0 deletions
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10
src/pkg/reflect/value.go
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@ -842,6 +842,16 @@ func valueInterface(v Value, safe bool) interface{} {
var eface emptyInterface
eface.typ = v.typ.runtimeType()
eface.word = v.iword()
if v.flag&flagIndir != 0 && v.typ.size > ptrSize {
// eface.word is a pointer to the actual data,
// which might be changed. We need to return
// a pointer to unchanging data, so make a copy.
ptr := unsafe_New(v.typ)
memmove(ptr, unsafe.Pointer(eface.word), v.typ.size)
eface.word = iword(ptr)
}
return *(*interface{})(unsafe.Pointer(&eface))
}