mirror of
https://github.com/golang/go
synced 2024-11-17 17:04:47 -07:00
ea6259d5e9
IsSliceInBounds(x, y) asserts that y is not negative, but there were cases where this is not true. Change code generation to ensure that this is true when it's not obviously true. Prove phase cleans a few of these out. With this change the compiler text section is 0.06% larger, that is, not very much. Benchmarking still TBD, may need to wait for access to a benchmarking box (next week). Also corrected run.go to handle '?' in -update_errors output. Fixes #28797. Change-Id: Ia8af90bc50a91ae6e934ef973def8d3f398fac7b Reviewed-on: https://go-review.googlesource.com/c/152477 Run-TryBot: David Chase <drchase@google.com> Reviewed-by: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
54 lines
900 B
Go
54 lines
900 B
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)
|
|
}
|
|
}
|