diff options
Diffstat (limited to '')
-rw-r--r-- | test/fixedbugs/issue15747.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/fixedbugs/issue15747.go b/test/fixedbugs/issue15747.go new file mode 100644 index 0000000..7825958 --- /dev/null +++ b/test/fixedbugs/issue15747.go @@ -0,0 +1,45 @@ +// errorcheck -0 -live + +//go:build !goexperiment.cgocheck2 +// +build !goexperiment.cgocheck2 + +// 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$" "live at entry to f1: xx$" + // 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 + } + xx, _, err := f2(xx, 5) // ERROR "live at call to f2: &xx$" + if err != nil { + return err + } + return nil +} + +//go:noinline +func f2(d []byte, n int) (odata, res []byte, e interface{}) { // ERROR "live at entry to f2: d$" + if n > len(d) { + return d, nil, &T{M: "hello"} // ERROR "live at call to newobject: d" + } + res = d[:n] + odata = d[n:] + return +} |