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Source file test/fixedbugs/issue15747.go

Documentation: test/fixedbugs

  // errorcheck -0 -live -d=eagerwb
  // 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.
  // TODO(austin): This expects function calls to the write barrier, so
  // we enable the legacy eager write barrier. Fix this once the
  // buffered write barrier works on all arches.
  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$" "live at call to writebarrierptr: err.data err.type$"
  	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:]

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