// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"cmd/internal/objfile"
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"debug/dwarf"
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"internal/testenv"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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"testing"
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)
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func testDWARF(t *testing.T, buildmode string, expectDWARF bool, env ...string) {
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testenv.MustHaveCGO(t)
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testenv.MustHaveGoBuild(t)
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if runtime.GOOS == "plan9" {
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t.Skip("skipping on plan9; no DWARF symbol table in executables")
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}
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out, err := exec.Command(testenv.GoToolPath(t), "list", "-f", "{{.Stale}}", "cmd/link").CombinedOutput()
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if err != nil {
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t.Fatalf("go list: %v\n%s", err, out)
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}
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if string(out) != "false\n" {
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if os.Getenv("GOROOT_FINAL_OLD") != "" {
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t.Skip("cmd/link is stale, but $GOROOT_FINAL_OLD is set")
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}
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t.Fatalf("cmd/link is stale - run go install cmd/link")
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}
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tmpDir, err := ioutil.TempDir("", "go-link-TestDWARF")
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if err != nil {
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t.Fatal("TempDir failed: ", err)
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}
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defer os.RemoveAll(tmpDir)
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for _, prog := range []string{"testprog", "testprogcgo"} {
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t.Run(prog, func(t *testing.T) {
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exe := filepath.Join(tmpDir, prog+".exe")
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dir := "../../runtime/testdata/" + prog
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cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", exe)
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if buildmode != "" {
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cmd.Args = append(cmd.Args, "-buildmode", buildmode)
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}
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cmd.Args = append(cmd.Args, dir)
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if env != nil {
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cmd.Env = append(os.Environ(), env...)
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}
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("go build -o %v %v: %v\n%s", exe, dir, err, out)
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}
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if buildmode == "c-archive" {
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// Extract the archive and use the go.o object within.
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cmd := exec.Command("ar", "-x", exe)
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cmd.Dir = tmpDir
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if out, err := cmd.CombinedOutput(); err != nil {
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t.Fatalf("ar -x %s: %v\n%s", exe, err, out)
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}
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exe = filepath.Join(tmpDir, "go.o")
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}
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f, err := objfile.Open(exe)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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syms, err := f.Symbols()
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if err != nil {
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t.Fatal(err)
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}
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var addr uint64
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for _, sym := range syms {
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if sym.Name == "main.main" {
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addr = sym.Addr
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break
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}
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}
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if addr == 0 {
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t.Fatal("cannot find main.main in symbols")
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}
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d, err := f.DWARF()
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if err != nil {
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if expectDWARF {
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t.Fatal(err)
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}
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return
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} else {
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if !expectDWARF {
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t.Fatal("unexpected DWARF section")
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}
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}
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// TODO: We'd like to use filepath.Join here.
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// Also related: golang.org/issue/19784.
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wantFile := path.Join(prog, "main.go")
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wantLine := 24
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r := d.Reader()
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var line dwarf.LineEntry
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for {
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cu, err := r.Next()
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if err != nil {
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t.Fatal(err)
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}
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if cu == nil {
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break
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}
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if cu.Tag != dwarf.TagCompileUnit {
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r.SkipChildren()
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continue
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}
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if cu.Val(dwarf.AttrStmtList) == nil {
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continue
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}
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lr, err := d.LineReader(cu)
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if err != nil {
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t.Fatal(err)
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}
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for {
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err := lr.Next(&line)
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if err == io.EOF {
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break
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}
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if err != nil {
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t.Fatal(err)
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}
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if line.Address == addr {
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if !strings.HasSuffix(line.File.Name, wantFile) || line.Line != wantLine {
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t.Errorf("%#x is %s:%d, want %s:%d", addr, line.File.Name, line.Line, filepath.Join("...", wantFile), wantLine)
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}
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return
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}
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}
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}
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t.Fatalf("did not find file:line for %#x (main.main)", addr)
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})
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}
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}
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func TestDWARF(t *testing.T) {
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testDWARF(t, "", true)
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}
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func TestDWARFiOS(t *testing.T) {
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// Normally we run TestDWARF on native platform. But on iOS we don't have
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// go build, so we do this test with a cross build.
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// Only run this on darwin/amd64, where we can cross build for iOS.
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if testing.Short() {
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t.Skip("skipping in short mode")
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}
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if runtime.GOARCH != "amd64" || runtime.GOOS != "darwin" {
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t.Skip("skipping on non-darwin/amd64 platform")
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}
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if err := exec.Command("xcrun", "--help").Run(); err != nil {
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t.Skipf("error running xcrun, required for iOS cross build: %v", err)
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}
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cc := "CC=" + runtime.GOROOT() + "/misc/ios/clangwrap.sh"
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// iOS doesn't allow unmapped segments, so iOS executables don't have DWARF.
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testDWARF(t, "", false, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm", "GOARM=7")
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testDWARF(t, "", false, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm64")
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// However, c-archive iOS objects have embedded DWARF.
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testDWARF(t, "c-archive", true, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm", "GOARM=7")
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testDWARF(t, "c-archive", true, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm64")
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}
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