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// Copyright 2014 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 main
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"testing"
)
func loadSyms(t *testing.T) map[string]string {
if runtime.GOOS == "nacl" {
t.Skip("skipping on nacl")
}
cmd := exec.Command("go", "tool", "nm", os.Args[0])
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("go tool nm %v: %v\n%s", os.Args[0], err, string(out))
}
syms := make(map[string]string)
scanner := bufio.NewScanner(bytes.NewReader(out))
for scanner.Scan() {
f := strings.Fields(scanner.Text())
if len(f) < 3 {
continue
}
syms[f[2]] = f[0]
}
if err := scanner.Err(); err != nil {
t.Fatalf("error reading symbols: %v", err)
}
return syms
}
func runObjDump(t *testing.T, exe, startaddr, endaddr string) (path, lineno string) {
if runtime.GOOS == "nacl" {
t.Skip("skipping on nacl")
}
cmd := exec.Command(exe, os.Args[0], startaddr, endaddr)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("go tool objdump %v: %v\n%s", os.Args[0], err, string(out))
}
f := strings.Split(string(out), "\n")
if len(f) < 1 {
t.Fatal("objdump output must have at least one line")
}
pathAndLineNo := f[0]
f = strings.Split(pathAndLineNo, ":")
if runtime.GOOS == "windows" {
switch len(f) {
case 2:
return f[0], f[1]
case 3:
return f[0] + ":" + f[1], f[2]
default:
t.Fatalf("no line number found in %q", pathAndLineNo)
}
}
if len(f) != 2 {
t.Fatalf("no line number found in %q", pathAndLineNo)
}
return f[0], f[1]
}
func testObjDump(t *testing.T, exe, startaddr, endaddr string, line int) {
srcPath, srcLineNo := runObjDump(t, exe, startaddr, endaddr)
fi1, err := os.Stat("objdump_test.go")
if err != nil {
t.Fatalf("Stat failed: %v", err)
}
fi2, err := os.Stat(srcPath)
if err != nil {
t.Fatalf("Stat failed: %v", err)
}
if !os.SameFile(fi1, fi2) {
t.Fatalf("objdump_test.go and %s are not same file", srcPath)
}
if srcLineNo != fmt.Sprint(line) {
t.Fatalf("line number = %v; want %d", srcLineNo, line)
}
}
func TestObjDump(t *testing.T) {
_, _, line, _ := runtime.Caller(0)
syms := loadSyms(t)
tmp, exe := buildObjdump(t)
defer os.RemoveAll(tmp)
startaddr := syms["cmd/objdump.TestObjDump"]
addr, err := strconv.ParseUint(startaddr, 16, 64)
if err != nil {
t.Fatalf("invalid start address %v: %v", startaddr, err)
}
endaddr := fmt.Sprintf("%x", addr+10)
testObjDump(t, exe, startaddr, endaddr, line-1)
testObjDump(t, exe, "0x"+startaddr, "0x"+endaddr, line-1)
}
func buildObjdump(t *testing.T) (tmp, exe string) {
if runtime.GOOS == "nacl" {
t.Skip("skipping on nacl")
}
tmp, err := ioutil.TempDir("", "TestObjDump")
if err != nil {
t.Fatal("TempDir failed: ", err)
}
exe = filepath.Join(tmp, "testobjdump.exe")
out, err := exec.Command("go", "build", "-o", exe, "cmd/objdump").CombinedOutput()
if err != nil {
os.RemoveAll(tmp)
t.Fatalf("go build -o %v cmd/objdump: %v\n%s", exe, err, string(out))
}
return
}
var x86Need = []string{
"fmthello.go:6",
"TEXT main.main(SB)",
"JMP main.main(SB)",
"CALL fmt.Println(SB)",
"RET",
}
var armNeed = []string{
"fmthello.go:6",
"TEXT main.main(SB)",
"B.LS main.main(SB)",
"BL fmt.Println(SB)",
"RET",
}
// objdump is fully cross platform: it can handle binaries
// from any known operating system and architecture.
// We could in principle add binaries to testdata and check
// all the supported systems during this test. However, the
// binaries would be about 1 MB each, and we don't want to
// add that much junk to the hg repository. Instead, build a
// binary for the current system (only) and test that objdump
// can handle that one.
func TestDisasm(t *testing.T) {
tmp, exe := buildObjdump(t)
defer os.RemoveAll(tmp)
hello := filepath.Join(tmp, "hello.exe")
out, err := exec.Command("go", "build", "-o", hello, "testdata/fmthello.go").CombinedOutput()
if err != nil {
t.Fatalf("go build fmthello.go: %v\n%s", err, out)
}
need := []string{
"fmthello.go:6",
"TEXT main.main(SB)",
}
switch runtime.GOARCH {
case "amd64", "386":
need = append(need, x86Need...)
case "arm":
need = append(need, armNeed...)
}
out, err = exec.Command(exe, "-s", "main.main", hello).CombinedOutput()
if err != nil {
t.Fatalf("objdump fmthello.exe: %v\n%s", err, out)
}
text := string(out)
ok := true
for _, s := range need {
if !strings.Contains(text, s) {
t.Errorf("disassembly missing '%s'", s)
ok = false
}
}
if !ok {
t.Logf("full disassembly:\n%s", text)
}
}
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