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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:18:25 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:18:25 +0000
commit109be507377fe7f6e8819ac94041d3fdcdf6fd2f (patch)
tree2806a689f8fab4a2ec9fc949830ef270a91d667d /test/fixedbugs/issue27518b.go
parentInitial commit. (diff)
downloadgolang-1.19-109be507377fe7f6e8819ac94041d3fdcdf6fd2f.tar.xz
golang-1.19-109be507377fe7f6e8819ac94041d3fdcdf6fd2f.zip
Adding upstream version 1.19.8.upstream/1.19.8upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'test/fixedbugs/issue27518b.go')
-rw-r--r--test/fixedbugs/issue27518b.go72
1 files changed, 72 insertions, 0 deletions
diff --git a/test/fixedbugs/issue27518b.go b/test/fixedbugs/issue27518b.go
new file mode 100644
index 0000000..ea72a30
--- /dev/null
+++ b/test/fixedbugs/issue27518b.go
@@ -0,0 +1,72 @@
+// run
+
+// Copyright 2018 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.
+
+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"
+ }
+ }
+}
+
+type StackObj struct {
+ h *HeapObj
+}
+
+func gc(shouldFinalize bool) {
+ runtime.GC()
+ runtime.GC()
+ runtime.GC()
+ if shouldFinalize != finalized {
+ err = "heap object finalized at the wrong time"
+ }
+}
+
+func main() {
+ var s StackObj
+ s.h = new(HeapObj)
+ s.h.init()
+ runtime.SetFinalizer(s.h, func(h *HeapObj) {
+ finalized = true
+ })
+ gc(false)
+ h := g(&s)
+ gc(false)
+ h.check()
+ gc(true) // finalize here, after return value's last use. (Go1.11 never runs the finalizer.)
+ if err != "" {
+ panic(err)
+ }
+}
+
+func g(p *StackObj) (v *HeapObj) {
+ gc(false)
+ v = p.h // last use of the stack object. the only reference to the heap object is in the return slot.
+ gc(false)
+ defer func() {
+ gc(false)
+ recover()
+ gc(false)
+ }()
+ *(*int)(nil) = 0
+ return
+}