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go/test/fixedbugs/issue27557.go
Matthew Dempsky f346a4c44c test: add regress test for #27557
This commit just adds a regress test for a few of the important corner
cases that I identified in #27557, which turn out to not be tested
anywhere.

While here, annotate a few of the existing test cases where we could
improve escape analysis.

Updates #27557.

Change-Id: Ie57792a538f7899bb17915485fabc86100f469a3
Reviewed-on: https://go-review.googlesource.com/c/go/+/197137
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-09-25 17:06:15 +00:00

43 lines
1008 B
Go

// errorcheck -0 -l -m
// Copyright 2019 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.
package p
var sink interface{}
func _() {
// BAD: t should not escape
var t T // ERROR "moved to heap"
f := t.noescape // ERROR "t.noescape does not escape"
f()
}
func _() {
var t T // ERROR "moved to heap"
f := t.escape // ERROR "t.escape does not escape"
f()
}
func _() {
var t T // ERROR "moved to heap"
f := t.returns // ERROR "t.returns does not escape"
sink = f()
}
type T struct{}
func (t *T) noescape() {} // ERROR "t does not escape"
func (t *T) escape() { sink = t } // ERROR "leaking param: t$"
func (t *T) returns() *T { return t } // ERROR "leaking param: t to result ~r0 level=0"
func (t *T) recursive() { // ERROR "leaking param: t$"
sink = t
var t2 T // ERROR "moved to heap"
f := t2.recursive // ERROR "t2.recursive does not escape"
f()
}