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// 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")
}
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