runtime: support Pinner.Pin for slice type

Fixes #65286

Change-Id: Ic8749b359bd56ecc43873bf3f3598e398e18847b

Author: qiulaidongfeng

src/runtime/pinner.go

@@ -24,7 +24,7 @@ type Pinner struct {
 // contains pointers to Go objects, these objects must be pinned separately if they
 // are going to be accessed from C code.
 //
-// The argument must be a pointer of any type or an [unsafe.Pointer].
+// The argument must be a pointer of any type or an [unsafe.Pointer] or string or slice.
 // It's safe to call Pin on non-Go pointers, in which case Pin will do nothing.
 func (p *Pinner) Pin(pointer any) {
 	if p.pinner == nil {
@@ -114,6 +114,8 @@ func pinnerGetPtr(i *any) unsafe.Pointer {
 		data = e.data
 	case kindString:
 		data = unsafe.Pointer(unsafe.StringData(*(*string)(e.data)))
+	case kindSlice:
+		data = unsafe.Pointer(unsafe.SliceData(*(*[]byte)(e.data)))
 	default:
 		panic(errorString("runtime.Pinner: argument is not a pointer or string: " + toRType(etyp).string()))
 	}

src/runtime/pinner_test.go

@@ -559,3 +559,20 @@ func TestPinnerPinString(t *testing.T) {
 func getHeapStr() string {
 	return string(byte(fastrand()))
 }
+
+func TestPinnerPinSlice(t *testing.T) {
+	var pinner runtime.Pinner
+	s := make([]*int, 10)
+	pinner.Pin(s)
+	addr := unsafe.Pointer(unsafe.SliceData(s))
+	if !runtime.IsPinned(addr) {
+		t.Fatal("not marked as pinned")
+	}
+	if runtime.GetPinCounter(addr) != nil {
+		t.Fatal("pin counter should not exist")
+	}
+	pinner.Unpin()
+	if runtime.IsPinned(addr) {
+		t.Fatal("still marked as pinned")
+	}
+}