blob: 836d0eab25e67d21fe7b18d04bfe9aaeb692b6d8 [file] [log] [blame]
// errorcheck -0 -live
// 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 15747: liveness analysis was marking heap-escaped params live too much,
// and worse was using the wrong bitmap bits to do so.
package p
var global *[]byte
type Q struct{}
type T struct{ M string }
var b bool
func f1(q *Q, xx []byte) interface{} { // ERROR "live at call to newobject: xx$" "live at call to writebarrierptr: &xx$" "live at entry to f1: xx$"
// xx was copied from the stack to the heap on the previous line:
// xx was live for the first two prints but then it switched to &xx
// being live. We should not see plain xx again.
if b {
global = &xx // ERROR "live at call to writebarrierptr: &xx$"
xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$" "live at call to writebarrierptr: err.type$"
if err != nil {
return err
return nil
func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$"
if n > len(d) {
return d, nil, &T{M: "hello"} // ERROR "live at call to newobject: d" "live at call to writebarrierptr: d"
res = d[:n]
odata = d[n:]