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8b3194ac8f
instrumentnode() accidentally copies parent's already-instrumented nodes into child's Ninit block. This generates repeated code in race-instrumentation. This case surfaces only when it duplicates inline-labels, because of compile time error. In other cases, it silently generates incorrect instrumented code. This change prevents it from doing so. Fixes #17449. Change-Id: Icddf2198990442166307e176b7e20aa0cf6c171c Reviewed-on: https://go-review.googlesource.com/31317 Reviewed-by: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
35 lines
933 B
Go
35 lines
933 B
Go
// errorcheck -0 -race
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// Copyright 2016 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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// Issue 17449: race instrumentation copies over previous instrumented nodes from parents block into child's Ninit block.
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// This code surfaces the duplication at compile time because of generated inline labels.
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package master
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type PriorityList struct {
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elems []interface{}
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}
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func (x *PriorityList) Len() int { return len(x.elems) }
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func (l *PriorityList) remove(i int) interface{} {
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elem := l.elems[i]
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l.elems = append(l.elems[:i], l.elems[i+1:]...)
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return elem
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}
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func (l *PriorityList) Next() interface{} {
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return l.remove(l.Len() - 1)
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}
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var l *PriorityList
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func Foo() {
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// It would fail here if instrumented code (including inline-label) was copied.
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for elem := l.Next(); elem != nil; elem = l.Next() {
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}
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}
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