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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 cshared_test
import (
"debug/elf"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"testing"
"unicode"
)
// C compiler with args (from $(go env CC) $(go env GOGCCFLAGS)).
var cc []string
// An environment with GOPATH=$(pwd).
var gopathEnv []string
// ".exe" on Windows.
var exeSuffix string
var GOOS, GOARCH, GOROOT string
var installdir, androiddir string
var libSuffix, libgoname string
func TestMain(m *testing.M) {
GOOS = goEnv("GOOS")
GOARCH = goEnv("GOARCH")
GOROOT = goEnv("GOROOT")
if _, err := os.Stat(GOROOT); os.IsNotExist(err) {
log.Fatalf("Unable able to find GOROOT at '%s'", GOROOT)
}
// Directory where cgo headers and outputs will be installed.
// The installation directory format varies depending on the platform.
installdir = path.Join("pkg", fmt.Sprintf("%s_%s_testcshared", GOOS, GOARCH))
switch GOOS {
case "darwin":
libSuffix = "dylib"
case "windows":
libSuffix = "dll"
default:
libSuffix = "so"
installdir = path.Join("pkg", fmt.Sprintf("%s_%s_testcshared_shared", GOOS, GOARCH))
}
androiddir = fmt.Sprintf("/data/local/tmp/testcshared-%d", os.Getpid())
if GOOS == "android" {
args := append(adbCmd(), "shell", "mkdir", "-p", androiddir)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("setupAndroid failed: %v\n%s\n", err, out)
}
}
libgoname = "libgo." + libSuffix
cc = []string{goEnv("CC")}
out := goEnv("GOGCCFLAGS")
quote := '\000'
start := 0
lastSpace := true
backslash := false
s := string(out)
for i, c := range s {
if quote == '\000' && unicode.IsSpace(c) {
if !lastSpace {
cc = append(cc, s[start:i])
lastSpace = true
}
} else {
if lastSpace {
start = i
lastSpace = false
}
if quote == '\000' && !backslash && (c == '"' || c == '\'') {
quote = c
backslash = false
} else if !backslash && quote == c {
quote = '\000'
} else if (quote == '\000' || quote == '"') && !backslash && c == '\\' {
backslash = true
} else {
backslash = false
}
}
}
if !lastSpace {
cc = append(cc, s[start:])
}
switch GOOS {
case "darwin":
// For Darwin/ARM.
// TODO(crawshaw): can we do better?
cc = append(cc, []string{"-framework", "CoreFoundation", "-framework", "Foundation"}...)
case "android":
cc = append(cc, "-pie", "-fuse-ld=gold")
}
libgodir := GOOS + "_" + GOARCH
switch GOOS {
case "darwin":
if GOARCH == "arm" || GOARCH == "arm64" {
libgodir += "_shared"
}
case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
libgodir += "_shared"
}
cc = append(cc, "-I", filepath.Join("pkg", libgodir))
// Build an environment with GOPATH=$(pwd)
dir, err := os.Getwd()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
gopathEnv = append(os.Environ(), "GOPATH="+dir)
if GOOS == "windows" {
exeSuffix = ".exe"
}
st := m.Run()
os.Remove(libgoname)
os.RemoveAll("pkg")
cleanupHeaders()
cleanupAndroid()
os.Exit(st)
}
func goEnv(key string) string {
out, err := exec.Command("go", "env", key).Output()
if err != nil {
fmt.Fprintf(os.Stderr, "go env %s failed:\n%s", key, err)
fmt.Fprintf(os.Stderr, "%s", err.(*exec.ExitError).Stderr)
os.Exit(2)
}
return strings.TrimSpace(string(out))
}
func cmdToRun(name string) string {
return "./" + name + exeSuffix
}
func adbCmd() []string {
cmd := []string{"adb"}
if flags := os.Getenv("GOANDROID_ADB_FLAGS"); flags != "" {
cmd = append(cmd, strings.Split(flags, " ")...)
}
return cmd
}
func adbPush(t *testing.T, filename string) {
if GOOS != "android" {
return
}
args := append(adbCmd(), "push", filename, fmt.Sprintf("%s/%s", androiddir, filename))
cmd := exec.Command(args[0], args[1:]...)
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("adb command failed: %v\n%s\n", err, out)
}
}
func adbRun(t *testing.T, env []string, adbargs ...string) string {
if GOOS != "android" {
t.Fatalf("trying to run adb command when operating system is not android.")
}
args := append(adbCmd(), "shell")
// Propagate LD_LIBRARY_PATH to the adb shell invocation.
for _, e := range env {
if strings.Index(e, "LD_LIBRARY_PATH=") != -1 {
adbargs = append([]string{e}, adbargs...)
break
}
}
shellcmd := fmt.Sprintf("cd %s; %s", androiddir, strings.Join(adbargs, " "))
args = append(args, shellcmd)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("adb command failed: %v\n%s\n", err, out)
}
return strings.Replace(string(out), "\r", "", -1)
}
func run(t *testing.T, env []string, args ...string) string {
t.Helper()
cmd := exec.Command(args[0], args[1:]...)
cmd.Env = env
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("command failed: %v\n%v\n%s\n", args, err, out)
} else {
t.Logf("run: %v", args)
}
return string(out)
}
func runExe(t *testing.T, env []string, args ...string) string {
t.Helper()
if GOOS == "android" {
return adbRun(t, env, args...)
}
return run(t, env, args...)
}
func runCC(t *testing.T, args ...string) string {
t.Helper()
// This function is run in parallel, so append to a copy of cc
// rather than cc itself.
return run(t, nil, append(append([]string(nil), cc...), args...)...)
}
func createHeaders() error {
args := []string{"go", "install", "-i", "-buildmode=c-shared",
"-installsuffix", "testcshared", "libgo"}
cmd := exec.Command(args[0], args[1:]...)
cmd.Env = gopathEnv
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("command failed: %v\n%v\n%s\n", args, err, out)
}
args = []string{"go", "build", "-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libgoname,
filepath.Join("src", "libgo", "libgo.go")}
cmd = exec.Command(args[0], args[1:]...)
cmd.Env = gopathEnv
out, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("command failed: %v\n%v\n%s\n", args, err, out)
}
if GOOS == "android" {
args = append(adbCmd(), "push", libgoname, fmt.Sprintf("%s/%s", androiddir, libgoname))
cmd = exec.Command(args[0], args[1:]...)
out, err = cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("adb command failed: %v\n%s\n", err, out)
}
}
return nil
}
var (
headersOnce sync.Once
headersErr error
)
func createHeadersOnce(t *testing.T) {
headersOnce.Do(func() {
headersErr = createHeaders()
})
if headersErr != nil {
t.Fatal(headersErr)
}
}
func cleanupHeaders() {
os.Remove("libgo.h")
}
func cleanupAndroid() {
if GOOS != "android" {
return
}
args := append(adbCmd(), "shell", "rm", "-rf", androiddir)
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("cleanupAndroid failed: %v\n%s\n", err, out)
}
}
// test0: exported symbols in shared lib are accessible.
func TestExportedSymbols(t *testing.T) {
t.Parallel()
cmd := "testp0"
bin := cmdToRun(cmd)
createHeadersOnce(t)
runCC(t, "-I", installdir, "-o", cmd, "main0.c", libgoname)
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, append(gopathEnv, "LD_LIBRARY_PATH=."), bin)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
// test1: shared library can be dynamically loaded and exported symbols are accessible.
func TestExportedSymbolsWithDynamicLoad(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp1"
bin := cmdToRun(cmd)
createHeadersOnce(t)
runCC(t, "-o", cmd, "main1.c", "-ldl")
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, nil, bin, "./"+libgoname)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
// test2: tests libgo2 which does not export any functions.
func TestUnexportedSymbols(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp2"
bin := cmdToRun(cmd)
libname := "libgo2." + libSuffix
run(t,
gopathEnv,
"go", "build",
"-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libname, "libgo2",
)
adbPush(t, libname)
linkFlags := "-Wl,--no-as-needed"
if GOOS == "darwin" {
linkFlags = ""
}
runCC(t, "-o", cmd, "main2.c", linkFlags, libname)
adbPush(t, cmd)
defer os.Remove(libname)
defer os.Remove(bin)
out := runExe(t, append(gopathEnv, "LD_LIBRARY_PATH=."), bin)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
// test3: tests main.main is exported on android.
func TestMainExportedOnAndroid(t *testing.T) {
t.Parallel()
switch GOOS {
case "android":
break
default:
t.Logf("Skipping on %s", GOOS)
return
}
cmd := "testp3"
bin := cmdToRun(cmd)
createHeadersOnce(t)
runCC(t, "-o", cmd, "main3.c", "-ldl")
adbPush(t, cmd)
defer os.Remove(bin)
out := runExe(t, nil, bin, "./"+libgoname)
if strings.TrimSpace(out) != "PASS" {
t.Error(out)
}
}
func testSignalHandlers(t *testing.T, pkgname, cfile, cmd string) {
libname := pkgname + "." + libSuffix
run(t,
gopathEnv,
"go", "build",
"-buildmode=c-shared",
"-installsuffix", "testcshared",
"-o", libname, pkgname,
)
adbPush(t, libname)
runCC(t, "-pthread", "-o", cmd, cfile, "-ldl")
adbPush(t, cmd)
bin := cmdToRun(cmd)
defer os.Remove(libname)
defer os.Remove(bin)
defer os.Remove(pkgname + ".h")
out := runExe(t, nil, bin, "./"+libname)
if strings.TrimSpace(out) != "PASS" {
t.Error(run(t, nil, bin, libname, "verbose"))
}
}
// test4: test signal handlers
func TestSignalHandlers(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
testSignalHandlers(t, "libgo4", "main4.c", "testp4")
}
// test5: test signal handlers with os/signal.Notify
func TestSignalHandlersWithNotify(t *testing.T) {
t.Parallel()
if GOOS == "windows" {
t.Logf("Skipping on %s", GOOS)
return
}
testSignalHandlers(t, "libgo5", "main5.c", "testp5")
}
func TestPIE(t *testing.T) {
t.Parallel()
switch GOOS {
case "linux", "android":
break
default:
t.Logf("Skipping on %s", GOOS)
return
}
createHeadersOnce(t)
f, err := elf.Open(libgoname)
if err != nil {
t.Fatalf("elf.Open failed: %v", err)
}
defer f.Close()
ds := f.SectionByType(elf.SHT_DYNAMIC)
if ds == nil {
t.Fatalf("no SHT_DYNAMIC section")
}
d, err := ds.Data()
if err != nil {
t.Fatalf("can't read SHT_DYNAMIC contents: %v", err)
}
for len(d) > 0 {
var tag elf.DynTag
switch f.Class {
case elf.ELFCLASS32:
tag = elf.DynTag(f.ByteOrder.Uint32(d[:4]))
d = d[8:]
case elf.ELFCLASS64:
tag = elf.DynTag(f.ByteOrder.Uint64(d[:8]))
d = d[16:]
}
if tag == elf.DT_TEXTREL {
t.Fatalf("%s has DT_TEXTREL flag", libgoname)
}
}
}
// Test that installing a second time recreates the header files.
func TestCachedInstall(t *testing.T) {
tmpdir, err := ioutil.TempDir("", "cshared")
if err != nil {
t.Fatal(err)
}
// defer os.RemoveAll(tmpdir)
copyFile(t, filepath.Join(tmpdir, "src", "libgo", "libgo.go"), filepath.Join("src", "libgo", "libgo.go"))
copyFile(t, filepath.Join(tmpdir, "src", "p", "p.go"), filepath.Join("src", "p", "p.go"))
env := append(os.Environ(), "GOPATH="+tmpdir)
buildcmd := []string{"go", "install", "-x", "-i", "-buildmode=c-shared", "-installsuffix", "testcshared", "libgo"}
cmd := exec.Command(buildcmd[0], buildcmd[1:]...)
cmd.Env = env
t.Log(buildcmd)
out, err := cmd.CombinedOutput()
t.Logf("%s", out)
if err != nil {
t.Fatal(err)
}
var libgoh, ph string
walker := func(path string, info os.FileInfo, err error) error {
if err != nil {
t.Fatal(err)
}
var ps *string
switch filepath.Base(path) {
case "libgo.h":
ps = &libgoh
case "p.h":
ps = &ph
}
if ps != nil {
if *ps != "" {
t.Fatalf("%s found again", *ps)
}
*ps = path
}
return nil
}
if err := filepath.Walk(tmpdir, walker); err != nil {
t.Fatal(err)
}
if libgoh == "" {
t.Fatal("libgo.h not installed")
}
if ph == "" {
t.Fatal("p.h not installed")
}
if err := os.Remove(libgoh); err != nil {
t.Fatal(err)
}
if err := os.Remove(ph); err != nil {
t.Fatal(err)
}
cmd = exec.Command(buildcmd[0], buildcmd[1:]...)
cmd.Env = env
t.Log(buildcmd)
out, err = cmd.CombinedOutput()
t.Logf("%s", out)
if err != nil {
t.Fatal(err)
}
if _, err := os.Stat(libgoh); err != nil {
t.Errorf("libgo.h not installed in second run: %v", err)
}
if _, err := os.Stat(ph); err != nil {
t.Errorf("p.h not installed in second run: %v", err)
}
}
// copyFile copies src to dst.
func copyFile(t *testing.T, dst, src string) {
t.Helper()
data, err := ioutil.ReadFile(src)
if err != nil {
t.Fatal(err)
}
if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
t.Fatal(err)
}
if err := ioutil.WriteFile(dst, data, 0666); err != nil {
t.Fatal(err)
}
}