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.
7 // Liveness calculations were wrong for a result parameter pushed onto
8 // the heap in a function that used defer. Program would crash with
9 // runtime: bad pointer in frame main.A at 0xc4201e6838: 0x1
25 func A(n, m int64) (res int64, err error) {
26 defer f(&err) // output parameter's address escapes to a defer.
28 err = errors.New("No negative")
35 res = B(m) // This call to B drizzles a little junk on the stack.
41 // B does a little bit of recursion dribbling not-zero onto the stack.
43 func B(n int64) (res int64) {
44 if n <= 1 { // Prefer to leave a 1 on the stack.
52 for j := 0; j < 4; j++ { // j controls amount of B's stack dribble
53 for i := 0; i < 1000; i++ { // try more and more recursion until stack growth occurs in newobject in prologue
54 x, e = A(int64(i), int64(j))