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// Copyright 2012 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 runtime_test
import (
"fmt"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strings"
"sync"
"testing"
)
var toRemove []string
func TestMain(m *testing.M) {
status := m.Run()
for _, file := range toRemove {
os.RemoveAll(file)
}
os.Exit(status)
}
func testEnv(cmd *exec.Cmd) *exec.Cmd {
if cmd.Env != nil {
panic("environment already set")
}
for _, env := range os.Environ() {
// Exclude GODEBUG from the environment to prevent its output
// from breaking tests that are trying to parse other command output.
if strings.HasPrefix(env, "GODEBUG=") {
continue
}
// Exclude GOTRACEBACK for the same reason.
if strings.HasPrefix(env, "GOTRACEBACK=") {
continue
}
cmd.Env = append(cmd.Env, env)
}
return cmd
}
var testprog struct {
sync.Mutex
dir string
target map[string]buildexe
}
type buildexe struct {
exe string
err error
}
func runTestProg(t *testing.T, binary, name string) string {
testenv.MustHaveGoBuild(t)
exe, err := buildTestProg(t, binary)
if err != nil {
t.Fatal(err)
}
got, _ := testEnv(exec.Command(exe, name)).CombinedOutput()
return string(got)
}
func buildTestProg(t *testing.T, binary string) (string, error) {
checkStaleRuntime(t)
testprog.Lock()
defer testprog.Unlock()
if testprog.dir == "" {
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
testprog.dir = dir
toRemove = append(toRemove, dir)
}
if testprog.target == nil {
testprog.target = make(map[string]buildexe)
}
target, ok := testprog.target[binary]
if ok {
return target.exe, target.err
}
exe := filepath.Join(testprog.dir, binary+".exe")
cmd := exec.Command("go", "build", "-o", exe)
cmd.Dir = "testdata/" + binary
out, err := testEnv(cmd).CombinedOutput()
if err != nil {
exe = ""
target.err = fmt.Errorf("building %s: %v\n%s", binary, err, out)
testprog.target[binary] = target
return "", target.err
}
target.exe = exe
testprog.target[binary] = target
return exe, nil
}
var (
staleRuntimeOnce sync.Once // guards init of staleRuntimeErr
staleRuntimeErr error
)
func checkStaleRuntime(t *testing.T) {
staleRuntimeOnce.Do(func() {
// 'go run' uses the installed copy of runtime.a, which may be out of date.
out, err := testEnv(exec.Command("go", "list", "-f", "{{.Stale}}", "runtime")).CombinedOutput()
if err != nil {
staleRuntimeErr = fmt.Errorf("failed to execute 'go list': %v\n%v", err, string(out))
return
}
if string(out) != "false\n" {
staleRuntimeErr = fmt.Errorf("Stale runtime.a. Run 'go install runtime'.")
}
})
if staleRuntimeErr != nil {
t.Fatal(staleRuntimeErr)
}
}
func testCrashHandler(t *testing.T, cgo bool) {
type crashTest struct {
Cgo bool
}
var output string
if cgo {
output = runTestProg(t, "testprogcgo", "Crash")
} else {
output = runTestProg(t, "testprog", "Crash")
}
want := "main: recovered done\nnew-thread: recovered done\nsecond-new-thread: recovered done\nmain-again: recovered done\n"
if output != want {
t.Fatalf("output:\n%s\n\nwanted:\n%s", output, want)
}
}
func TestCrashHandler(t *testing.T) {
testCrashHandler(t, false)
}
func testDeadlock(t *testing.T, name string) {
output := runTestProg(t, "testprog", name)
want := "fatal error: all goroutines are asleep - deadlock!\n"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestSimpleDeadlock(t *testing.T) {
testDeadlock(t, "SimpleDeadlock")
}
func TestInitDeadlock(t *testing.T) {
testDeadlock(t, "InitDeadlock")
}
func TestLockedDeadlock(t *testing.T) {
testDeadlock(t, "LockedDeadlock")
}
func TestLockedDeadlock2(t *testing.T) {
testDeadlock(t, "LockedDeadlock2")
}
func TestGoexitDeadlock(t *testing.T) {
output := runTestProg(t, "testprog", "GoexitDeadlock")
want := "no goroutines (main called runtime.Goexit) - deadlock!"
if !strings.Contains(output, want) {
t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
}
}
func TestStackOverflow(t *testing.T) {
output := runTestProg(t, "testprog", "StackOverflow")
want := "runtime: goroutine stack exceeds 1474560-byte limit\nfatal error: stack overflow"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestThreadExhaustion(t *testing.T) {
output := runTestProg(t, "testprog", "ThreadExhaustion")
want := "runtime: program exceeds 10-thread limit\nfatal error: thread exhaustion"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestRecursivePanic(t *testing.T) {
output := runTestProg(t, "testprog", "RecursivePanic")
want := `wrap: bad
panic: again
`
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestGoexitCrash(t *testing.T) {
output := runTestProg(t, "testprog", "GoexitExit")
want := "no goroutines (main called runtime.Goexit) - deadlock!"
if !strings.Contains(output, want) {
t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
}
}
func TestGoexitDefer(t *testing.T) {
c := make(chan struct{})
go func() {
defer func() {
r := recover()
if r != nil {
t.Errorf("non-nil recover during Goexit")
}
c <- struct{}{}
}()
runtime.Goexit()
}()
// Note: if the defer fails to run, we will get a deadlock here
<-c
}
func TestGoNil(t *testing.T) {
output := runTestProg(t, "testprog", "GoNil")
want := "go of nil func value"
if !strings.Contains(output, want) {
t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
}
}
func TestMainGoroutineID(t *testing.T) {
output := runTestProg(t, "testprog", "MainGoroutineID")
want := "panic: test\n\ngoroutine 1 [running]:\n"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestNoHelperGoroutines(t *testing.T) {
output := runTestProg(t, "testprog", "NoHelperGoroutines")
matches := regexp.MustCompile(`goroutine [0-9]+ \[`).FindAllStringSubmatch(output, -1)
if len(matches) != 1 || matches[0][0] != "goroutine 1 [" {
t.Fatalf("want to see only goroutine 1, see:\n%s", output)
}
}
func TestBreakpoint(t *testing.T) {
output := runTestProg(t, "testprog", "Breakpoint")
want := "runtime.Breakpoint()"
if !strings.Contains(output, want) {
t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
}
}
func TestGoexitInPanic(t *testing.T) {
// see issue 8774: this code used to trigger an infinite recursion
output := runTestProg(t, "testprog", "GoexitInPanic")
want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestPanicAfterGoexit(t *testing.T) {
// an uncaught panic should still work after goexit
output := runTestProg(t, "testprog", "PanicAfterGoexit")
want := "panic: hello"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestRecoveredPanicAfterGoexit(t *testing.T) {
output := runTestProg(t, "testprog", "RecoveredPanicAfterGoexit")
want := "fatal error: no goroutines (main called runtime.Goexit) - deadlock!"
if !strings.HasPrefix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
func TestRecoverBeforePanicAfterGoexit(t *testing.T) {
// 1. defer a function that recovers
// 2. defer a function that panics
// 3. call goexit
// Goexit should run the #2 defer. Its panic
// should be caught by the #1 defer, and execution
// should resume in the caller. Like the Goexit
// never happened!
defer func() {
r := recover()
if r == nil {
panic("bad recover")
}
}()
defer func() {
panic("hello")
}()
runtime.Goexit()
}
func TestNetpollDeadlock(t *testing.T) {
output := runTestProg(t, "testprognet", "NetpollDeadlock")
want := "done\n"
if !strings.HasSuffix(output, want) {
t.Fatalf("output does not start with %q:\n%s", want, output)
}
}
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