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// 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 (
"bytes"
cmddwarf "cmd/internal/dwarf"
"cmd/internal/objfile"
"debug/dwarf"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"testing"
)
func testDWARF(t *testing.T, buildmode string, expectDWARF bool, env ...string) {
testenv.MustHaveCGO(t)
testenv.MustHaveGoBuild(t)
if runtime.GOOS == "plan9" {
t.Skip("skipping on plan9; no DWARF symbol table in executables")
}
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" {
if os.Getenv("GOROOT_FINAL_OLD") != "" {
t.Skip("cmd/link is stale, but $GOROOT_FINAL_OLD is set")
}
t.Fatalf("cmd/link is stale - run go install cmd/link")
}
for _, prog := range []string{"testprog", "testprogcgo"} {
prog := prog
expectDWARF := expectDWARF
if runtime.GOOS == "aix" && prog == "testprogcgo" {
extld := os.Getenv("CC")
if extld == "" {
extld = "gcc"
}
expectDWARF, err = cmddwarf.IsDWARFEnabledOnAIXLd(extld)
if err != nil {
t.Fatal(err)
}
}
t.Run(prog, func(t *testing.T) {
t.Parallel()
tmpDir, err := ioutil.TempDir("", "go-link-TestDWARF")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
exe := filepath.Join(tmpDir, prog+".exe")
dir := "../../runtime/testdata/" + prog
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", exe)
if buildmode != "" {
cmd.Args = append(cmd.Args, "-buildmode", buildmode)
}
cmd.Args = append(cmd.Args, dir)
if env != nil {
env = append(env, "CGO_CFLAGS=") // ensure CGO_CFLAGS does not contain any flags. Issue #35459
cmd.Env = append(os.Environ(), env...)
}
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("go build -o %v %v: %v\n%s", exe, dir, err, out)
}
if buildmode == "c-archive" {
// Extract the archive and use the go.o object within.
cmd := exec.Command("ar", "-x", exe)
cmd.Dir = tmpDir
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("ar -x %s: %v\n%s", exe, err, out)
}
exe = filepath.Join(tmpDir, "go.o")
}
if runtime.GOOS == "darwin" {
if _, err = exec.LookPath("symbols"); err == nil {
// Ensure Apple's tooling can parse our object for symbols.
out, err = exec.Command("symbols", exe).CombinedOutput()
if err != nil {
t.Fatalf("symbols %v: %v: %s", filepath.Base(exe), err, out)
} else {
if bytes.HasPrefix(out, []byte("Unable to find file")) {
// This failure will cause the App Store to reject our binaries.
t.Fatalf("symbols %v: failed to parse file", filepath.Base(exe))
} else if bytes.Contains(out, []byte(", Empty]")) {
t.Fatalf("symbols %v: parsed as empty", filepath.Base(exe))
}
}
}
}
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 {
if expectDWARF {
t.Fatal(err)
}
return
} else {
if !expectDWARF {
t.Fatal("unexpected DWARF section")
}
}
// 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()
entry, err := r.SeekPC(addr)
if err != nil {
t.Fatal(err)
}
lr, err := d.LineReader(entry)
if err != nil {
t.Fatal(err)
}
var line dwarf.LineEntry
if err := lr.SeekPC(addr, &line); err == dwarf.ErrUnknownPC {
t.Fatalf("did not find file:line for %#x (main.main)", addr)
} else if err != nil {
t.Fatal(err)
}
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)
}
})
}
}
func TestDWARF(t *testing.T) {
testDWARF(t, "", true)
if runtime.GOOS == "darwin" && !testing.Short() {
t.Run("c-archive", func(t *testing.T) {
testDWARF(t, "c-archive", true)
})
}
}
func TestDWARFiOS(t *testing.T) {
// Normally we run TestDWARF on native platform. But on iOS we don't have
// go build, so we do this test with a cross build.
// Only run this on darwin/amd64, where we can cross build for iOS.
if testing.Short() {
t.Skip("skipping in short mode")
}
if runtime.GOARCH != "amd64" || runtime.GOOS != "darwin" {
t.Skip("skipping on non-darwin/amd64 platform")
}
if err := exec.Command("xcrun", "--help").Run(); err != nil {
t.Skipf("error running xcrun, required for iOS cross build: %v", err)
}
cc := "CC=" + runtime.GOROOT() + "/misc/ios/clangwrap.sh"
// iOS doesn't allow unmapped segments, so iOS executables don't have DWARF.
testDWARF(t, "", false, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm", "GOARM=7")
testDWARF(t, "", false, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm64")
// However, c-archive iOS objects have embedded DWARF.
testDWARF(t, "c-archive", true, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm", "GOARM=7")
testDWARF(t, "c-archive", true, cc, "CGO_ENABLED=1", "GOOS=darwin", "GOARCH=arm64")
}
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