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https://github.com/golang/go
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7502ed3b90
Normally this happens when combining a sign extension and a load. We want the resulting combo-instruction to get the line number of the load, not the line number of the sign extension. For each rule, compute where we should get its line number by finding a value on the match side that can fault. Use that line number for all the new values created on the right-hand side. Fixes #27201 Change-Id: I19b3c6f468fff1a3c0bfbce2d6581828557064a3 Reviewed-on: https://go-review.googlesource.com/c/156937 Reviewed-by: David Chase <drchase@google.com>
38 lines
681 B
Go
38 lines
681 B
Go
// run
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// Copyright 2019 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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"runtime"
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"strings"
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)
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func main() {
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f(nil)
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}
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func f(p *int32) {
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defer checkstack()
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v := *p // panic should happen here, line 20
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sink = int64(v) // not here, line 21
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}
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var sink int64
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func checkstack() {
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_ = recover()
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var buf [1024]byte
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n := runtime.Stack(buf[:], false)
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s := string(buf[:n])
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if strings.Contains(s, "issue27201.go:21 ") {
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panic("panic at wrong location")
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}
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if !strings.Contains(s, "issue27201.go:20 ") {
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panic("no panic at correct location")
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}
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}
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