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diff --git a/js/src/jscell.h b/js/src/jscell.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is SpiderMonkey code.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Gregor Wagner <anygregor@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef jscell_h___
+#define jscell_h___
+
+struct JSCompartment;
+
+namespace js {
+namespace gc {
+
+template <typename T> struct Arena;
+struct ArenaBitmap;
+struct MarkingDelay;
+struct Chunk;
+struct FreeCell;
+
+/*
+ * A GC cell is the base class for GC Things like JSObject, JSShortString,
+ * JSFunction, JSXML and for an empty cell called FreeCell. It helps avoiding 
+ * casts from an Object to a Cell whenever we call GC related mark functions.
+ * Cell is not the base Class for JSString because static initialization
+ * (used for unitStringTables) does not work with inheritance.
+ */
+
+struct Cell {
+    static const size_t CellShift = 3;
+    static const size_t CellSize = size_t(1) << CellShift;
+    static const size_t CellMask = CellSize - 1;
+
+    inline Arena<Cell> *arena() const;
+    inline Chunk *chunk() const;
+    inline ArenaBitmap *bitmap() const;
+    JS_ALWAYS_INLINE size_t cellIndex() const;
+
+    JS_ALWAYS_INLINE bool isMarked(uint32 color) const;
+    JS_ALWAYS_INLINE bool markIfUnmarked(uint32 color) const;
+    JS_ALWAYS_INLINE void unmark(uint32 color) const;
+
+    inline JSCompartment *compartment() const;
+
+    /* Needed for compatibility reasons because Cell can't be a base class of JSString */
+    JS_ALWAYS_INLINE js::gc::Cell *asCell() { return this; }
+
+    JS_ALWAYS_INLINE js::gc::FreeCell *asFreeCell() {
+        return reinterpret_cast<FreeCell *>(this);
+    }
+};
+
+/* FreeCell has always size 8 */
+struct FreeCell : Cell {
+    union {
+        FreeCell *link;
+        double data;
+    };
+};
+
+JS_STATIC_ASSERT(sizeof(FreeCell) == 8);
+
+} /* namespace gc */
+} /* namespace js */
+
+#endif /* jscell_h___ */