1// run
2
3// Copyright 2016 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7// Test to make sure we don't think values are dead
8// when they are assigned to a PPARAMOUT slot before
9// the last GC safepoint.
10
11package main
12
13import (
14	"fmt"
15	"runtime"
16)
17
18// When a T is deallocated, T[1] is certain to
19// get clobbered (the runtime writes 0xdeaddeaddeaddead there).
20type T [4]int
21
22func f() (r, s *T) {
23	r = &T{0x30, 0x31, 0x32, 0x33}
24	runtime.GC()
25	s = &T{0x40, 0x41, 0x42, 0x43}
26	runtime.GC()
27	return
28}
29
30func main() {
31	r, s := f()
32	if r[1] != 0x31 {
33		fmt.Printf("bad r[1], want 0x31 got %x\n", r[1])
34	}
35	if s[1] != 0x41 {
36		fmt.Printf("bad s[1], want 0x41 got %x\n", s[1])
37	}
38}
39