diff -r 000000000000 -r 6474c204b198 js/src/vm/Id.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/vm/Id.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "js/Id.h"
+#include "js/RootingAPI.h"
+
+const jsid JSID_VOID  = { size_t(JSID_TYPE_VOID) };
+const jsid JSID_EMPTY = { size_t(JSID_TYPE_OBJECT) };
+
+static const jsid voidIdValue = JSID_VOID;
+static const jsid emptyIdValue = JSID_EMPTY;
+const JS::HandleId JSID_VOIDHANDLE = JS::HandleId::fromMarkedLocation(&voidIdValue);
+const JS::HandleId JSID_EMPTYHANDLE = JS::HandleId::fromMarkedLocation(&emptyIdValue);
+