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go/test/fixedbugs/bug423.go

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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
2012-02-20 22:38:01 -07:00
// 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")
}
}
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