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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>
This commit is contained in:
Matthew Dempsky 2019-09-24 17:35:15 -07:00
parent 8189a06190
commit f346a4c44c
5 changed files with 47 additions and 4 deletions

View File

@ -505,10 +505,7 @@ func (e *Escape) exprSkipInit(k EscHole, n *Node) {
case OCALLPART:
e.spill(k, n)
// esc.go says "Contents make it to memory, lose
// track." I think we can just flow n.Left to our
// spilled location though.
// TODO(mdempsky): Try that.
// TODO(mdempsky): We can do better here. See #27557.
e.assignHeap(n.Left, "call part", n)
case OPTRLIT:

View File

@ -1386,6 +1386,7 @@ func (t *Tm) M() { // ERROR "t does not escape$"
func foo141() {
var f func()
// BAD: new(Tm) should not escape
t := new(Tm) // ERROR "new\(Tm\) escapes to heap$"
f = t.M // ERROR "t.M does not escape$"
_ = f

View File

@ -1386,6 +1386,7 @@ func (t *Tm) M() { // ERROR "t does not escape$"
func foo141() {
var f func()
// BAD: new(Tm) should not escape
t := new(Tm) // ERROR "new\(Tm\) escapes to heap$"
f = t.M // ERROR "t.M does not escape$"
_ = f

View File

@ -14,6 +14,7 @@ func (s *S) Inc() {} // ERROR "s does not escape"
var N int
func F1() {
// BAD: s should not escape
var s S // ERROR "moved to heap: s"
for i := 0; i < N; i++ {
fs := []func(){ // ERROR "\[\]func\(\) literal does not escape"
@ -26,6 +27,7 @@ func F1() {
}
func F2() {
// BAD: s should not escape
var s S // ERROR "moved to heap: s"
for i := 0; i < N; i++ {
for _, f := range []func(){ // ERROR "\[\]func\(\) literal does not escape"

View File

@ -0,0 +1,42 @@
// 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()
}