1 // run 2 3 // Copyright 2014 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 that s[len(s):] - which can point past the end of the allocated block - 8 // does not confuse the garbage collector. 9 10 package main 11 12 import ( 13 "runtime" 14 "time" 15 ) 16 17 type T struct { 18 ptr **int 19 pad [120]byte 20 } 21 22 var things []interface{} 23 24 func main() { 25 setup() 26 runtime.GC() 27 runtime.GC() 28 time.Sleep(10*time.Millisecond) 29 runtime.GC() 30 runtime.GC() 31 time.Sleep(10*time.Millisecond) 32 } 33 34 func setup() { 35 var Ts []interface{} 36 buf := make([]byte, 128) 37 38 for i := 0; i < 10000; i++ { 39 s := string(buf) 40 t := &T{ptr: new(*int)} 41 runtime.SetFinalizer(t.ptr, func(**int) { panic("*int freed too early") }) 42 Ts = append(Ts, t) 43 things = append(things, s[len(s):]) 44 } 45 46 things = append(things, Ts...) 47 } 48 49
