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package runtime_test
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"strconv"
"testing"
)
func checkGdbPython(t *testing.T) {
cmd := exec.Command("gdb", "-nx", "-q", "--batch", "-iex", "python import sys; print('go gdb python support')")
out, err := cmd.CombinedOutput()
if err != nil {
t.Skipf("skipping due to issue running gdb: %v", err)
}
if string(out) != "go gdb python support\n" {
t.Skipf("skipping due to lack of python gdb support: %s", out)
}
// Issue 11214 reports various failures with older versions of gdb.
out, err = exec.Command("gdb", "--version").CombinedOutput()
re := regexp.MustCompile(`([0-9]+)\.([0-9]+)`)
matches := re.FindSubmatch(out)
if len(matches) < 3 {
t.Skipf("skipping: can't determine gdb version from\n%s\n", out)
}
major, err1 := strconv.Atoi(string(matches[1]))
minor, err2 := strconv.Atoi(string(matches[2]))
if err1 != nil || err2 != nil {
t.Skipf("skipping: can't determine gdb version: %v, %v", err1, err2)
}
if major < 7 || (major == 7 && minor < 7) {
t.Skipf("skipping: gdb version %d.%d too old", major, minor)
}
t.Logf("gdb version %d.%d", major, minor)
}
const helloSource = `
package main
import "fmt"
func main() {
mapvar := make(map[string]string,5)
mapvar["abc"] = "def"
mapvar["ghi"] = "jkl"
strvar := "abc"
ptrvar := &strvar
fmt.Println("hi") // line 10
_ = ptrvar
}
`
func TestGdbPython(t *testing.T) {
if runtime.GOOS == "darwin" {
t.Skip("gdb does not work on darwin")
}
checkGdbPython(t)
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
src := filepath.Join(dir, "main.go")
err = ioutil.WriteFile(src, []byte(helloSource), 0644)
if err != nil {
t.Fatalf("failed to create file: %v", err)
}
cmd := exec.Command("go", "build", "-o", "a.exe")
cmd.Dir = dir
out, err := testEnv(cmd).CombinedOutput()
if err != nil {
t.Fatalf("building source %v\n%s", err, out)
}
args := []string{"-nx", "-q", "--batch", "-iex",
fmt.Sprintf("add-auto-load-safe-path %s/src/runtime", runtime.GOROOT()),
"-ex", "br main.go:10",
"-ex", "run",
"-ex", "echo BEGIN info goroutines\n",
"-ex", "info goroutines",
"-ex", "echo END\n",
"-ex", "echo BEGIN print mapvar\n",
"-ex", "print mapvar",
"-ex", "echo END\n",
"-ex", "echo BEGIN print strvar\n",
"-ex", "print strvar",
"-ex", "echo END\n",
"-ex", "echo BEGIN print ptrvar\n",
"-ex", "print ptrvar",
"-ex", "echo END\n"}
// without framepointer, gdb cannot backtrace our non-standard
// stack frames on RISC architectures.
canBackTrace := false
switch runtime.GOARCH {
case "amd64", "386", "ppc64", "ppc64le", "arm", "arm64":
canBackTrace = true
args = append(args,
"-ex", "echo BEGIN goroutine 2 bt\n",
"-ex", "goroutine 2 bt",
"-ex", "echo END\n")
}
args = append(args, filepath.Join(dir, "a.exe"))
got, _ := exec.Command("gdb", args...).CombinedOutput()
firstLine := bytes.SplitN(got, []byte("\n"), 2)[0]
if string(firstLine) != "Loading Go Runtime support." {
// This can happen when using all.bash with
// GOROOT_FINAL set, because the tests are run before
// the final installation of the files.
cmd := exec.Command("go", "env", "GOROOT")
cmd.Env = []string{}
out, err := cmd.CombinedOutput()
if err != nil && bytes.Contains(out, []byte("cannot find GOROOT")) {
t.Skipf("skipping because GOROOT=%s does not exist", runtime.GOROOT())
}
t.Fatalf("failed to load Go runtime support: %s", firstLine)
}
// Extract named BEGIN...END blocks from output
partRe := regexp.MustCompile(`(?ms)^BEGIN ([^\n]*)\n(.*?)\nEND`)
blocks := map[string]string{}
for _, subs := range partRe.FindAllSubmatch(got, -1) {
blocks[string(subs[1])] = string(subs[2])
}
infoGoroutinesRe := regexp.MustCompile(`\*\s+\d+\s+running\s+`)
if bl := blocks["info goroutines"]; !infoGoroutinesRe.MatchString(bl) {
t.Fatalf("info goroutines failed: %s", bl)
}
printMapvarRe := regexp.MustCompile(`\Q = map[string]string = {["abc"] = "def", ["ghi"] = "jkl"}\E$`)
if bl := blocks["print mapvar"]; !printMapvarRe.MatchString(bl) {
t.Fatalf("print mapvar failed: %s", bl)
}
strVarRe := regexp.MustCompile(`\Q = "abc"\E$`)
if bl := blocks["print strvar"]; !strVarRe.MatchString(bl) {
t.Fatalf("print strvar failed: %s", bl)
}
if bl := blocks["print ptrvar"]; !strVarRe.MatchString(bl) {
t.Fatalf("print ptrvar failed: %s", bl)
}
btGoroutineRe := regexp.MustCompile(`^#0\s+runtime.+at`)
if bl := blocks["goroutine 2 bt"]; canBackTrace && !btGoroutineRe.MatchString(bl) {
t.Fatalf("goroutine 2 bt failed: %s", bl)
} else if !canBackTrace {
t.Logf("gdb cannot backtrace for GOARCH=%s, skipped goroutine backtrace test", runtime.GOARCH)
}
}
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