Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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
+}