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gc: zero unnamed return values on entry if func has defer

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R=ken2
CC=golang-dev
https://golang.org/cl/891050
This commit is contained in:
Russ Cox 2010-04-12 14:28:27 -07:00
parent 9149d91888
commit d9254d00f9
2 changed files with 36 additions and 4 deletions
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14
src/cmd/gc/walk.c
View File

@ -2312,7 +2312,7 @@ reorder4(NodeList *ll)
* copies of escaped parameters to the heap.
*/
NodeList*
paramstoheap(Type **argin)
paramstoheap(Type **argin, int out)
{
Type *t;
Iter savet;
@ -2322,6 +2322,12 @@ paramstoheap(Type **argin)
nn = nil;
for(t = structfirst(&savet, argin); t != T; t = structnext(&savet)) {
v = t->nname;
if(v == N && out && hasdefer) {
// Defer might stop a panic and show the
// return values as they exist at the time of panic.
// Make sure to zero them on entry to the function.
nn = list(nn, nod(OAS, nodarg(t, 1), N));
}
if(v == N || !(v->class & PHEAP))
continue;
@ -2366,9 +2372,9 @@ heapmoves(void)
{
NodeList *nn;
nn = paramstoheap(getthis(curfn->type));
nn = concat(nn, paramstoheap(getinarg(curfn->type)));
nn = concat(nn, paramstoheap(getoutarg(curfn->type)));
nn = paramstoheap(getthis(curfn->type), 0);
nn = concat(nn, paramstoheap(getinarg(curfn->type), 0));
nn = concat(nn, paramstoheap(getoutarg(curfn->type), 1));
curfn->enter = concat(curfn->enter, nn);
curfn->exit = returnsfromheap(getoutarg(curfn->type));
}

26
test/fixedbugs/bug266.go Normal file
View File

@ -0,0 +1,26 @@
// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug266
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
func f() int {
defer func() {
recover()
}()
panic("oops")
}
func g() int {
return 12345
}
func main() {
g() // leave 12345 on stack
x := f()
if x != 0 {
panic(x)
}
}