go/test/fixedbugs/bug423.go
Rémy Oudompheng f2ad374ae6 cmd/gc: don't believe that variables mentioned 256 times are unused.
Such variables would be put at 0(SP), leading to serious
corruptions at zero initialization.
Fixes #3084.

R=golang-dev, r
CC=golang-dev, remy
https://golang.org/cl/5683052
2012-02-21 16:38:01 +11:00

278 lines
2.3 KiB
Go

// 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.
// gc used to overflow a counter when a variable was
// mentioned 256 times, and generate stack corruption.
package main
func main() {
F(1)
}
func F(arg int) {
var X int64
_ = X // used once
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 32 times
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 64 times
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 96 times
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 128 times
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 200 times
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0
X = 0 // used 256 times
if arg != 0 {
panic("argument was changed")
}
}