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[release-branch.go1] cmd/8g: fix miscompilation due to BADWIDTH.

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««« backport f6a6fe780649
cmd/8g: fix miscompilation due to BADWIDTH.

Fixes #3899.

R=rsc
CC=golang-dev, remy
https://golang.org/cl/6453084

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This commit is contained in:
Rémy Oudompheng 2012-09-22 05:54:26 +10:00
parent ab91d4fe2a
commit 64a3b18387
2 changed files with 29 additions and 0 deletions
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1
src/cmd/8g/gsubr.c
View File

@ -1847,6 +1847,7 @@ naddr(Node *n, Addr *a, int canemitcode)
a->width = 0;
if(n->type != T) {
a->etype = simtype[n->type->etype];
dowidth(n->type);
a->width = n->type->width;
a->gotype = ngotype(n);
}

28
test/fixedbugs/bug450.go Normal file
View File

@ -0,0 +1,28 @@
// run
// Copyright 2012 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.
// Issue 3899: 8g incorrectly thinks a variable is
// "set but not used" and elides an assignment, causing
// variables to end up with wrong data.
//
// The reason is a miscalculation of variable width.
package main
func bar(f func()) {
f()
}
func foo() {
f := func() {}
if f == nil {
}
bar(f)
}
func main() {
foo()
}