1 files changed, 20 insertions, 0 deletions
diff --git a/deps/v8/src/builtins/builtins-promise.cc b/deps/v8/src/builtins/builtins-promise.cc
new file mode 100644
index 0000000000..671bfa21fb
--- /dev/null
+++ b/deps/v8/src/builtins/builtins-promise.cc
@@ -0,0 +1,20 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/builtins/builtins-utils.h"
+#include "src/builtins/builtins.h"
+#include "src/objects-inl.h"
+
+namespace v8 {
+namespace internal {
+
+BUILTIN(IsPromise) {
+  SealHandleScope scope(isolate);
+
+  Handle<Object> object = args.atOrUndefined(isolate, 1);
+  return isolate->heap()->ToBoolean(object->IsJSPromise());
+}
+
+}  // namespace internal
+}  // namespace v8