go asan_useAfterReturn 源码
golang asan_useAfterReturn 代码
文件路径：/misc/cgo/testsanitizers/testdata/asan_useAfterReturn.go
// Copyright 2021 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
// The -fsanitize=address option of C compier can detect stack-use-after-return bugs.
// In the following program, the local variable 'local' was moved to heap by the Go
// compiler because foo() is returning the reference to 'local', and return stack of
// foo() will be invalid. Thus for main() to use the reference to 'local', the 'local'
// must be available even after foo() has finished. Therefore, Go has no such issue.
import "fmt"
var ptr *int
func main() {
foo()
fmt.Printf("ptr=%x, %v", *ptr, ptr)
}
func foo() {
var local int
local = 1
ptr = &local // local is moved to heap.
}
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