mirror of
https://github.com/golang/go
synced 2024-11-17 15:04:45 -07:00
b3369063e5
Adds a new build tag "gcflags_noopt" that can be used in test/*.go tests. Fixes #27833 Change-Id: I4ea0ccd9e9e58c4639de18645fec81eb24a3a929 Reviewed-on: https://go-review.googlesource.com/136898 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
58 lines
2.0 KiB
Go
58 lines
2.0 KiB
Go
// +build !gcflags_noopt
|
|
// errorcheck -0 -m
|
|
|
|
// Copyright 2018 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 foo
|
|
|
|
import "bytes"
|
|
|
|
// In order to get desired results, we need a combination of
|
|
// both escape analysis and inlining.
|
|
|
|
func bufferNotEscape() string {
|
|
// b itself does not escape, only its buf field will be
|
|
// copied during String() call, but object "handle" itself
|
|
// can be stack-allocated.
|
|
var b bytes.Buffer
|
|
b.WriteString("123") // ERROR "b does not escape"
|
|
b.Write([]byte{'4'}) // ERROR "b does not escape" "\[\]byte literal does not escape"
|
|
return b.String() // ERROR "b does not escape" "inlining call" "string\(bytes\.b\.buf\[bytes.b.off:\]\) escapes to heap"
|
|
}
|
|
|
|
func bufferNoEscape2(xs []string) int { // ERROR "xs does not escape"
|
|
b := bytes.NewBuffer(make([]byte, 0, 64)) // ERROR "inlining call" "make\(\[\]byte, 0, 64\) does not escape" "&bytes.Buffer literal does not escape"
|
|
for _, x := range xs {
|
|
b.WriteString(x)
|
|
}
|
|
return b.Len() // ERROR "inlining call"
|
|
}
|
|
|
|
func bufferNoEscape3(xs []string) string { // ERROR "xs does not escape"
|
|
b := bytes.NewBuffer(make([]byte, 0, 64)) // ERROR "inlining call" "make\(\[\]byte, 0, 64\) does not escape" "&bytes.Buffer literal does not escape"
|
|
for _, x := range xs {
|
|
b.WriteString(x)
|
|
b.WriteByte(',')
|
|
}
|
|
return b.String() // ERROR "inlining call" "string\(bytes.b.buf\[bytes\.b\.off:\]\) escapes to heap"
|
|
}
|
|
|
|
func bufferNoEscape4() []byte {
|
|
var b bytes.Buffer
|
|
b.Grow(64) // ERROR "b does not escape"
|
|
useBuffer(&b) // ERROR "&b does not escape"
|
|
return b.Bytes() // ERROR "inlining call" "b does not escape"
|
|
}
|
|
|
|
func bufferNoEscape5() {
|
|
b := bytes.NewBuffer(make([]byte, 0, 128)) // ERROR "inlining call" "make\(\[\]byte, 0, 128\) does not escape" "&bytes.Buffer literal does not escape"
|
|
useBuffer(b)
|
|
}
|
|
|
|
//go:noinline
|
|
func useBuffer(b *bytes.Buffer) { // ERROR "b does not escape"
|
|
b.WriteString("1234")
|
|
}
|