mirror of
https://github.com/golang/go
synced 2024-11-20 03:34:40 -07:00
439f9397fc
Because profiling signals can arrive at any time, we must handle the case where a profiling signal arrives halfway through a goroutine switch. Luckily, although there is much to think through, very little needs to change. Fixes #6000. Fixes #6015. R=golang-dev, dvyukov CC=golang-dev https://golang.org/cl/13421048
125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
// Copyright 2012 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 runtime_test
|
|
|
|
import (
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
. "runtime"
|
|
"strconv"
|
|
"strings"
|
|
"testing"
|
|
)
|
|
|
|
var errf error
|
|
|
|
func errfn() error {
|
|
return errf
|
|
}
|
|
|
|
func errfn1() error {
|
|
return io.EOF
|
|
}
|
|
|
|
func BenchmarkIfaceCmp100(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
for j := 0; j < 100; j++ {
|
|
if errfn() == io.EOF {
|
|
b.Fatal("bad comparison")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkIfaceCmpNil100(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
for j := 0; j < 100; j++ {
|
|
if errfn1() == nil {
|
|
b.Fatal("bad comparison")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkDefer(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
defer1()
|
|
}
|
|
}
|
|
|
|
func defer1() {
|
|
defer func(x, y, z int) {
|
|
if recover() != nil || x != 1 || y != 2 || z != 3 {
|
|
panic("bad recover")
|
|
}
|
|
}(1, 2, 3)
|
|
return
|
|
}
|
|
|
|
func BenchmarkDefer10(b *testing.B) {
|
|
for i := 0; i < b.N/10; i++ {
|
|
defer2()
|
|
}
|
|
}
|
|
|
|
func defer2() {
|
|
for i := 0; i < 10; i++ {
|
|
defer func(x, y, z int) {
|
|
if recover() != nil || x != 1 || y != 2 || z != 3 {
|
|
panic("bad recover")
|
|
}
|
|
}(1, 2, 3)
|
|
}
|
|
}
|
|
|
|
func BenchmarkDeferMany(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
defer func(x, y, z int) {
|
|
if recover() != nil || x != 1 || y != 2 || z != 3 {
|
|
panic("bad recover")
|
|
}
|
|
}(1, 2, 3)
|
|
}
|
|
}
|
|
|
|
// The profiling signal handler needs to know whether it is executing runtime.gogo.
|
|
// The constant RuntimeGogoBytes in arch_*.h gives the size of the function;
|
|
// we don't have a way to obtain it from the linker (perhaps someday).
|
|
// Test that the constant matches the size determined by 'go tool nm -S'.
|
|
// The value reported will include the padding between runtime.gogo and the
|
|
// next function in memory. That's fine.
|
|
func TestRuntimeGogoBytes(t *testing.T) {
|
|
dir, err := ioutil.TempDir("", "go-build")
|
|
if err != nil {
|
|
t.Fatalf("failed to create temp directory: %v", err)
|
|
}
|
|
defer os.RemoveAll(dir)
|
|
|
|
out, err := exec.Command("go", "build", "-o", dir+"/hello", "../../../test/helloworld.go").CombinedOutput()
|
|
if err != nil {
|
|
t.Fatalf("building hello world: %v\n%s", err, out)
|
|
}
|
|
|
|
out, err = exec.Command("go", "tool", "nm", "-S", dir+"/hello").CombinedOutput()
|
|
if err != nil {
|
|
t.Fatalf("go tool nm: %v\n%s", err, out)
|
|
}
|
|
|
|
for _, line := range strings.Split(string(out), "\n") {
|
|
f := strings.Fields(line)
|
|
if len(f) == 4 && f[3] == "runtime.gogo" {
|
|
size, _ := strconv.Atoi(f[1])
|
|
if GogoBytes() != int32(size) {
|
|
t.Fatalf("RuntimeGogoBytes = %d, should be %d", GogoBytes(), size)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
t.Fatalf("go tool nm did not report size for runtime.gogo")
|
|
}
|