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// run
// Copyright 2018 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 26407: ensure that stack variables which have
// had their address taken and then used in a comparison,
// but are otherwise unused, are cleared.
package main
func main() {
poison()
test()
}
//go:noinline
func poison() {
// initialise the stack with invalid pointers
var large [256]uintptr
for i := range large {
large[i] = 1
}
use(large[:])
}
//go:noinline
func test() {
a := 2
x := &a
if x != compare(&x) {
panic("not possible")
}
}
//go:noinline
func compare(x **int) *int {
var y *int
if x == &y {
panic("not possible")
}
// grow the stack to trigger a check for invalid pointers
grow()
if x == &y {
panic("not possible")
}
return *x
}
//go:noinline
func grow() {
var large [1 << 16]uintptr
use(large[:])
}
//go:noinline
func use(_ []uintptr) { }