diff -r 000000000000 -r 6474c204b198 js/src/vm/StringObject-inl.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/vm/StringObject-inl.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- 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/. */
+
+#ifndef vm_StringObject_inl_h
+#define vm_StringObject_inl_h
+
+#include "vm/StringObject.h"
+
+#include "jsobjinlines.h"
+
+#include "vm/Shape-inl.h"
+
+namespace js {
+
+inline bool
+StringObject::init(JSContext *cx, HandleString str)
+{
+    JS_ASSERT(numFixedSlots() == 2);
+
+    Rooted<StringObject *> self(cx, this);
+
+    if (!EmptyShape::ensureInitialCustomShape<StringObject>(cx, self))
+        return false;
+
+    JS_ASSERT(self->nativeLookup(cx, NameToId(cx->names().length))->slot() == LENGTH_SLOT);
+
+    self->setStringThis(str);
+
+    return true;
+}
+
+inline StringObject *
+StringObject::create(JSContext *cx, HandleString str, NewObjectKind newKind)
+{
+    JSObject *obj = NewBuiltinClassInstance(cx, &class_, newKind);
+    if (!obj)
+        return nullptr;
+    Rooted<StringObject*> strobj(cx, &obj->as<StringObject>());
+    if (!strobj->init(cx, str))
+        return nullptr;
+    return strobj;
+}
+
+} // namespace js
+
+#endif /* vm_StringObject_inl_h */