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master
test/fixedbugs/issue32477.go
71 строка
1 KB
Keith Randall
cmd/link: fix deferreturn detector
07 июн 2019, 21:51
07 июн 2019, 21:51
9eb4031
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// run // Copyright 2019 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. // Make sure we use the deferreturn live map instead of // the entry live map when handling a segv in a function // that defers. package main import "runtime" var finalized bool var err string type HeapObj [8]int64 const filler int64 = 0x123456789abcdef0 func (h *HeapObj) init() { for i := 0; i < len(*h); i++ { h[i] = filler } } func (h *HeapObj) check() { for i := 0; i < len(*h); i++ { if h[i] != filler { err = "filler overwritten" } } } func gc(shouldFinalize bool) { runtime.GC() runtime.GC() runtime.GC() if shouldFinalize != finalized { err = "heap object finalized at the wrong time" } } func main() { h := new(HeapObj) h.init() runtime.SetFinalizer(h, func(h *HeapObj) { finalized = true }) gc(false) g(h) if err != "" { panic(err) } } func g(h *HeapObj) { gc(false) h.check() // h is now unused defer func() { // h should not be live here. Previously we used to // use the function entry point as the place to get // the live map when handling a segv. gc(true) recover() }() *(*int)(nil) = 0 // trigger a segv return }