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// Copyright 2011 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 debug_test
import (
"bytes"
"fmt"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"runtime"
. "runtime/debug"
"strings"
"testing"
)
func TestMain(m *testing.M) {
if os.Getenv("GO_RUNTIME_DEBUG_TEST_DUMP_GOROOT") != "" {
fmt.Println(runtime.GOROOT())
os.Exit(0)
}
os.Exit(m.Run())
}
type T int
func (t *T) ptrmethod() []byte {
return Stack()
}
func (t T) method() []byte {
return t.ptrmethod()
}
/*
The traceback should look something like this, modulo line numbers and hex constants.
Don't worry much about the base levels, but check the ones in our own package.
goroutine 10 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
/Users/r/go/src/runtime/debug/stack.go:28 +0x80
runtime/debug.(*T).ptrmethod(0xc82005ee70, 0x0, 0x0, 0x0)
/Users/r/go/src/runtime/debug/stack_test.go:15 +0x29
runtime/debug.T.method(0x0, 0x0, 0x0, 0x0)
/Users/r/go/src/runtime/debug/stack_test.go:18 +0x32
runtime/debug.TestStack(0xc8201ce000)
/Users/r/go/src/runtime/debug/stack_test.go:37 +0x38
testing.tRunner(0xc8201ce000, 0x664b58)
/Users/r/go/src/testing/testing.go:456 +0x98
created by testing.RunTests
/Users/r/go/src/testing/testing.go:561 +0x86d
*/
func TestStack(t *testing.T) {
b := T(0).method()
lines := strings.Split(string(b), "\n")
if len(lines) < 6 {
t.Fatal("too few lines")
}
// If built with -trimpath, file locations should start with package paths.
// Otherwise, file locations should start with a GOROOT/src prefix
// (for whatever value of GOROOT is baked into the binary, not the one
// that may be set in the environment).
fileGoroot := ""
if envGoroot := os.Getenv("GOROOT"); envGoroot != "" {
// Since GOROOT is set explicitly in the environment, we can't be certain
// that it is the same GOROOT value baked into the binary, and we can't
// change the value in-process because runtime.GOROOT uses the value from
// initial (not current) environment. Spawn a subprocess to determine the
// real baked-in GOROOT.
t.Logf("found GOROOT %q from environment; checking embedded GOROOT value", envGoroot)
testenv.MustHaveExec(t)
exe, err := os.Executable()
if err != nil {
t.Fatal(err)
}
cmd := exec.Command(exe)
cmd.Env = append(os.Environ(), "GOROOT=", "GO_RUNTIME_DEBUG_TEST_DUMP_GOROOT=1")
out, err := cmd.Output()
if err != nil {
t.Fatal(err)
}
fileGoroot = string(bytes.TrimSpace(out))
} else {
// Since GOROOT is not set in the environment, its value (if any) must come
// from the path embedded in the binary.
fileGoroot = runtime.GOROOT()
}
filePrefix := ""
if fileGoroot != "" {
filePrefix = filepath.ToSlash(fileGoroot) + "/src/"
}
n := 0
frame := func(file, code string) {
t.Helper()
line := lines[n]
if !strings.Contains(line, code) {
t.Errorf("expected %q in %q", code, line)
}
n++
line = lines[n]
wantPrefix := "\t" + filePrefix + file
if !strings.HasPrefix(line, wantPrefix) {
t.Errorf("in line %q, expected prefix %q", line, wantPrefix)
}
n++
}
n++
frame("runtime/debug/stack.go", "runtime/debug.Stack")
frame("runtime/debug/stack_test.go", "runtime/debug_test.(*T).ptrmethod")
frame("runtime/debug/stack_test.go", "runtime/debug_test.T.method")
frame("runtime/debug/stack_test.go", "runtime/debug_test.TestStack")
frame("testing/testing.go", "")
}
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