cmd/internal/goobj: add tests

Change-Id: I4a0fe1c8625e7e9adfd84ac6910da83d0268f928
Reviewed-on: https://go-review.googlesource.com/60130Reviewed-by: David Crawshaw <crawshaw@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/internal/goobj/goobj_test.go

+// 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 goobj
+
+import (
+	"fmt"
+	"internal/testenv"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+var (
+	buildDir  string
+	go1obj    string
+	go2obj    string
+	goarchive string
+)
+
+func TestMain(m *testing.M) {
+	if !testenv.HasGoBuild() {
+		return
+	}
+
+	if runtime.GOOS == "linux" && runtime.GOARCH == "arm" {
+		return // skip tests due to #19811
+	}
+
+	if err := buildGoobj(); err != nil {
+		fmt.Println(err)
+		os.RemoveAll(buildDir)
+		os.Exit(1)
+	}
+
+	exit := m.Run()
+
+	os.RemoveAll(buildDir)
+	os.Exit(exit)
+}
+
+func buildGoobj() error {
+	var err error
+
+	buildDir, err = ioutil.TempDir("", "TestGoobj")
+	if err != nil {
+		return err
+	}
+
+	go1obj = filepath.Join(buildDir, "go1.o")
+	go2obj = filepath.Join(buildDir, "go2.o")
+	goarchive = filepath.Join(buildDir, "go.a")
+
+	gotool, err := testenv.GoTool()
+	if err != nil {
+		return err
+	}
+
+	go1src := filepath.Join("testdata", "go1.go")
+	go2src := filepath.Join("testdata", "go2.go")
+
+	out, err := exec.Command(gotool, "tool", "compile", "-o", go1obj, go1src).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("go tool compile -o %s %s: %v\n%s", go1obj, go1src, err, out)
+	}
+	out, err = exec.Command(gotool, "tool", "compile", "-o", go2obj, go2src).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("go tool compile -o %s %s: %v\n%s", go2obj, go2src, err, out)
+	}
+	out, err = exec.Command(gotool, "tool", "pack", "c", goarchive, go1obj, go2obj).CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("go tool pack c %s %s %s: %v\n%s", goarchive, go1obj, go2obj, err, out)
+	}
+
+	return nil
+}
+
+func TestParseGoobj(t *testing.T) {
+	path := go1obj
+
+	f, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	p, err := Parse(f, "mypkg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if p.Arch != runtime.GOARCH {
+		t.Errorf("%s: got %v, want %v", path, p.Arch, runtime.GOARCH)
+	}
+	var found bool
+	for _, s := range p.Syms {
+		if s.Name == "mypkg.go1" {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Errorf(`%s: symbol "mypkg.go1" not found`, path)
+	}
+}
+
+func TestParseArchive(t *testing.T) {
+	path := goarchive
+
+	f, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	p, err := Parse(f, "mypkg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if p.Arch != runtime.GOARCH {
+		t.Errorf("%s: got %v, want %v", path, p.Arch, runtime.GOARCH)
+	}
+	var found1 bool
+	var found2 bool
+	for _, s := range p.Syms {
+		if s.Name == "mypkg.go1" {
+			found1 = true
+		}
+		if s.Name == "mypkg.go2" {
+			found2 = true
+		}
+	}
+	if !found1 {
+		t.Errorf(`%s: symbol "mypkg.go1" not found`, path)
+	}
+	if !found2 {
+		t.Errorf(`%s: symbol "mypkg.go2" not found`, path)
+	}
+}

src/cmd/internal/goobj/testdata/go1.go

+// 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 mypkg
+
+import "fmt"
+
+func go1() {
+	fmt.Println("go1")
+}

src/cmd/internal/goobj/testdata/go2.go

+// 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 mypkg
+
+import "fmt"
+
+func go2() {
+	fmt.Println("go2")
+}