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de1c934b97
The checkptr instrumentation is currently inserted before slice operation has validated that n <= Big. So instead of panic, checkptr have false positive throws. To fix this, just insert the checkptr instrumentation after the bound checking during SSA generation. Fixes #46938 Change-Id: I9dbf84441c711842ccc883f3654ca8766ac696d8 Reviewed-on: https://go-review.googlesource.com/c/go/+/343972 Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
30 lines
584 B
Go
30 lines
584 B
Go
// run -gcflags="-d=checkptr"
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// Copyright 2021 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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"strings"
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"unsafe"
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)
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func main() {
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defer func() {
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err := recover()
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if err == nil {
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panic("expected panic")
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}
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if got := err.(error).Error(); !strings.Contains(got, "slice bounds out of range") {
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panic("expected panic slice out of bound, got " + got)
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}
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}()
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s := make([]int64, 100)
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p := unsafe.Pointer(&s[0])
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n := 1000
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_ = (*[10]int64)(p)[:n:n]
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}
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