--- /dev/null
+// Copyright 2017 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 (
+ "cmd/internal/objfile"
+ "debug/dwarf"
+ "internal/testenv"
+ "io"
+ "io/ioutil"
+ "os"
+ "os/exec"
+ "path"
+ "path/filepath"
+ "runtime"
+ "strings"
+ "testing"
+)
+
+func TestDWARF(t *testing.T) {
+ if runtime.GOOS == "windows" {
+ t.Skip("DWARF is not supported on Windows")
+ }
+
+ testenv.MustHaveGoBuild(t)
+
+ out, err := exec.Command(testenv.GoToolPath(t), "list", "-f", "{{.Stale}}", "cmd/link").CombinedOutput()
+ if err != nil {
+ t.Fatalf("go list: %v\n%s", err, out)
+ }
+ if string(out) != "false\n" {
+ t.Fatalf("cmd/link is stale - run go install cmd/link")
+ }
+
+ tmpDir, err := ioutil.TempDir("", "go-link-TestDWARF")
+ if err != nil {
+ t.Fatal("TempDir failed: ", err)
+ }
+ defer os.RemoveAll(tmpDir)
+
+ for _, prog := range []string{"testprog", "testprogcgo"} {
+ t.Run(prog, func(t *testing.T) {
+ exe := filepath.Join(tmpDir, prog+".exe")
+ dir := "../../runtime/testdata/" + prog
+ out, err := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, dir).CombinedOutput()
+ if err != nil {
+ t.Fatalf("go build -o %v %v: %v\n%s", exe, dir, err, out)
+ }
+
+ f, err := objfile.Open(exe)
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer f.Close()
+
+ syms, err := f.Symbols()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ var addr uint64
+ for _, sym := range syms {
+ if sym.Name == "main.main" {
+ addr = sym.Addr
+ break
+ }
+ }
+ if addr == 0 {
+ t.Fatal("cannot find main.main in symbols")
+ }
+
+ d, err := f.DWARF()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // TODO: We'd like to use filepath.Join here.
+ // Also related: golang.org/issue/19784.
+ wantFile := path.Join(prog, "main.go")
+ wantLine := 24
+ r := d.Reader()
+ var line dwarf.LineEntry
+ for {
+ cu, err := r.Next()
+ if err != nil {
+ t.Fatal(err)
+ }
+ if cu == nil {
+ break
+ }
+ if cu.Tag != dwarf.TagCompileUnit {
+ r.SkipChildren()
+ continue
+ }
+ lr, err := d.LineReader(cu)
+ if err != nil {
+ t.Fatal(err)
+ }
+ for {
+ err := lr.Next(&line)
+ if err == io.EOF {
+ break
+ }
+ if err != nil {
+ t.Fatal(err)
+ }
+ if line.Address == addr {
+ if !strings.HasSuffix(line.File.Name, wantFile) || line.Line != wantLine {
+ t.Errorf("%#x is %s:%d, want %s:%d", addr, line.File.Name, line.Line, filepath.Join("...", wantFile), wantLine)
+ }
+ return
+ }
+ }
+ }
+ t.Fatalf("did not find file:line for %#x (main.main)", addr)
+ })
+ }
+}