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https://github.com/golang/go
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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
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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)
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// test expects f to panic, but not to run out of memory,
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// which is a non-panic fatal error. OOM results from failure
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// to properly check negative limit.
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func test(f func()) {
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defer func() {
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r := recover()
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if r == nil {
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panic("panic wasn't recoverable")
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}
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}()
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f()
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}
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//go:noinline
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func id(x int) int {
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return x
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}
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func main() {
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test(foo)
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test(bar)
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}
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func foo() {
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b := make([]byte, 0)
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b = append(b, 1)
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id(len(b))
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id(len(b) - 2)
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s := string(b[1 : len(b)-2])
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fmt.Println(s)
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}
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func bar() {
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b := make([]byte, 1)
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b = append(b, 1)
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i := id(-1)
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if i < len(b) { // establish value is not too large.
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s := string(b[1:i]) // should check for negative also.
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fmt.Println(s)
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}
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}
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