runtime: fix GDB "info goroutines" for Go 1.5

"info goroutines" is failing because it hasn't kept up with changes in
the 1.5 runtime.  This fixes three issues preventing "info goroutines"
from working.  allg is no longer a linked list, so switch to using the
allgs slice.  The g struct's 'status' field is now called
'atomicstatus', so rename uses of 'status'.  Finally, this was trying
to parse str(pc) as an int, but str(pc) can return symbolic
information after the raw hex value; fix this by stripping everything
after the first space.

This also adds a test for "info goroutines" to runtime-gdb_test, which
was previously quite skeletal.

Change-Id: I8ad83ee8640891cdd88ecd28dad31ed9b5833b7a
Reviewed-on: https://go-review.googlesource.com/4935
Reviewed-by: Minux Ma <minux@golang.org>

1 files changed, 24 insertions, 3 deletions

diff --git a/src/runtime/runtime-gdb_test.go b/src/runtime/runtime-gdb_test.go
index 4911dc000d..a946749f47 100644
--- a/src/runtime/runtime-gdb_test.go
+++ b/src/runtime/runtime-gdb_test.go
@@ -1,11 +1,13 @@
 package runtime_test
 
 import (
+	"bytes"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"testing"
 )
@@ -30,7 +32,7 @@ func main() {
 }
 `
 
-func TestGdbLoadRuntimeSupport(t *testing.T) {
+func TestGdbPython(t *testing.T) {
 	checkGdbPython(t)
 
 	dir, err := ioutil.TempDir("", "go-build")
@@ -54,8 +56,27 @@ func TestGdbLoadRuntimeSupport(t *testing.T) {
 
 	got, _ := exec.Command("gdb", "-nx", "-q", "--batch", "-iex",
 		fmt.Sprintf("add-auto-load-safe-path %s/src/runtime", runtime.GOROOT()),
+		"-ex", "br 'main.main'",
+		"-ex", "run",
+		"-ex", "echo BEGIN info goroutines\n",
+		"-ex", "info goroutines",
+		"-ex", "echo END\n",
 		filepath.Join(dir, "a.exe")).CombinedOutput()
-	if string(got) != "Loading Go Runtime support.\n" {
-		t.Fatalf("%s", got)
+
+	firstLine := bytes.SplitN(got, []byte("\n"), 2)[0]
+	if string(firstLine) != "Loading Go Runtime support." {
+		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(`\d+\s+running\s+runtime`)
+	if bl := blocks["info goroutines"]; !infoGoroutinesRe.MatchString(bl) {
+		t.Fatalf("info goroutines failed: %s", bl)
 	}
 }