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 11 package main 12 13 import ( 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). 20 type T [4]int 21 22 func 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 30 func 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
