go issue28797 源码
golang issue28797 代码
文件路径：/test/fixedbugs/issue28797.go
// 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.
package main
import (
"fmt"
)
// test expects f to panic, but not to run out of memory,
// which is a non-panic fatal error. OOM results from failure
// to properly check negative limit.
func test(f func()) {
defer func() {
r := recover()
if r == nil {
panic("panic wasn't recoverable")
}
}()
f()
}
//go:noinline
func id(x int) int {
return x
}
func main() {
test(foo)
test(bar)
}
func foo() {
b := make([]byte, 0)
b = append(b, 1)
id(len(b))
id(len(b) - 2)
s := string(b[1 : len(b)-2])
fmt.Println(s)
}
func bar() {
b := make([]byte, 1)
b = append(b, 1)
i := id(-1)
if i < len(b) { // establish value is not too large.
s := string(b[1:i]) // should check for negative also.
fmt.Println(s)
}
}
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