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-rw-r--r--test/fixedbugs/issue17381.go54
1 files changed, 54 insertions, 0 deletions
diff --git a/test/fixedbugs/issue17381.go b/test/fixedbugs/issue17381.go
new file mode 100644
index 0000000..be63633
--- /dev/null
+++ b/test/fixedbugs/issue17381.go
@@ -0,0 +1,54 @@
+// run
+
+// Copyright 2016 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.
+
+// issue 17381: make sure leave function with non-empty frame
+// saves link register, so that traceback will work.
+
+package main
+
+import (
+ "runtime"
+ "unsafe"
+)
+
+func main() {
+ defer func() {
+ if recover() == nil {
+ panic("did not panic")
+ }
+ pcs := make([]uintptr, 20)
+ n := runtime.Callers(1, pcs)
+ for _, pc := range pcs[:n] {
+ if runtime.FuncForPC(pc).Name() == "main.main" {
+ return
+ }
+ }
+ panic("cannot find main.main in backtrace")
+ }()
+
+ prep()
+ f() // should panic
+}
+
+func funcPC(f interface{}) uintptr {
+ var ptr uintptr
+ return **(**uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&f)) + unsafe.Sizeof(ptr)))
+}
+
+//go:noinline
+func f() {
+ var t [1]int // non-empty frame
+ *(*int)(nil) = t[0]
+}
+
+var p = funcPC(runtime.GC) + 8
+
+//go:noinline
+func prep() {
+ // put some garbage on stack
+ var x = [20]uintptr{p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p, p}
+ _ = x
+}