blob: 2c01456f6b0e39f65bfae8bd0fe2e848dbfccd9a [file] [log] [blame]
// 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, 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")
}
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
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 {
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")
}
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()
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
}
if cu.Val(dwarf.AttrStmtList) == nil {
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)
})
}
}
func TestDWARF(t *testing.T) {
testDWARF(t, "", 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")
}