go global_test 源码
golang global_test 代码
文件路径：/src/cmd/compile/internal/test/global_test.go
// Copyright 2015 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 test
import (
"bytes"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"testing"
)
// Make sure "hello world" does not link in all the
// fmt.scanf routines. See issue 6853.
func TestScanfRemoval(t *testing.T) {
testenv.MustHaveGoBuild(t)
t.Parallel()
// Make a directory to work in.
dir, err := ioutil.TempDir("", "issue6853a-")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(dir)
// Create source.
src := filepath.Join(dir, "test.go")
f, err := os.Create(src)
if err != nil {
t.Fatalf("could not create source file: %v", err)
}
f.Write([]byte(`
package main
import "fmt"
func main() {
fmt.Println("hello world")
}
`))
f.Close()
// Name of destination.
dst := filepath.Join(dir, "test")
// Compile source.
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", dst, src)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("could not build target: %v\n%s", err, out)
}
// Check destination to see if scanf code was included.
cmd = exec.Command(testenv.GoToolPath(t), "tool", "nm", dst)
out, err = cmd.CombinedOutput()
if err != nil {
t.Fatalf("could not read target: %v", err)
}
if bytes.Contains(out, []byte("scanInt")) {
t.Fatalf("scanf code not removed from helloworld")
}
}
// Make sure -S prints assembly code. See issue 14515.
func TestDashS(t *testing.T) {
testenv.MustHaveGoBuild(t)
t.Parallel()
// Make a directory to work in.
dir, err := ioutil.TempDir("", "issue14515-")
if err != nil {
t.Fatalf("could not create directory: %v", err)
}
defer os.RemoveAll(dir)
// Create source.
src := filepath.Join(dir, "test.go")
f, err := os.Create(src)
if err != nil {
t.Fatalf("could not create source file: %v", err)
}
f.Write([]byte(`
package main
import "fmt"
func main() {
fmt.Println("hello world")
}
`))
f.Close()
// Compile source.
cmd := exec.Command(testenv.GoToolPath(t), "build", "-gcflags", "-S", "-o", filepath.Join(dir, "test"), src)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("could not build target: %v\n%s", err, out)
}
patterns := []string{
// It is hard to look for actual instructions in an
// arch-independent way. So we'll just look for
// pseudo-ops that are arch-independent.
"\tTEXT\t",
"\tFUNCDATA\t",
"\tPCDATA\t",
}
outstr := string(out)
for _, p := range patterns {
if !strings.Contains(outstr, p) {
println(outstr)
panic("can't find pattern " + p)
}
}
}
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