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-rw-r--r--test/fixedbugs/issue32477.go71
1 files changed, 71 insertions, 0 deletions
diff --git a/test/fixedbugs/issue32477.go b/test/fixedbugs/issue32477.go
new file mode 100644
index 0000000..8b3c175
--- /dev/null
+++ b/test/fixedbugs/issue32477.go
@@ -0,0 +1,71 @@
+// 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
+}