--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Property.java	Tue Nov 18 16:18:45 2014 +0100
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.object;
+
+/**
+ * Property objects represent the mapping between low-level stores and high-level data. The simplest
+ * Property could be nothing more than a map of one index to one property's value, but abstracting
+ * the interface allows for getter/setter methods, type-checked properties, and other such
+ * specialized and language-specific behavior. ECMAScript[8.6.1]
+ */
+public abstract class Property {
+    protected Property() {
+    }
+
+    public static Property create(Object key, Location location, int flags) {
+        return Layout.getFactory().createProperty(key, location, flags);
+    }
+
+    /**
+     * Get property identifier.
+     */
+    public abstract Object getKey();
+
+    /**
+     * Get property flags.
+     */
+    public abstract int getFlags();
+
+    /**
+     * Change the property's location.
+     *
+     * @return a Property with the new location (or {@code this} if the location is unchanged).
+     */
+    public abstract Property relocate(Location newLocation);
+
+    /**
+     * Gets the value of this property of the object.
+     *
+     * @param store the store that this property resides in
+     * @param shape the current shape of the object, which must contain this location
+     * @see DynamicObject#get(Object, Object)
+     */
+    public abstract Object get(DynamicObject store, Shape shape);
+
+    /**
+     * Gets the value of this property of the object.
+     *
+     * @param store the store that this property resides in
+     * @param condition the result of a shape check or {@code false}
+     * @see DynamicObject#get(Object, Object)
+     * @see #get(DynamicObject, Shape)
+     */
+    public abstract Object get(DynamicObject store, boolean condition);
+
+    /**
+     * Assigns value to this property of the object.
+     *
+     * Throws an exception if the value cannot be assigned to the property's current location.
+     *
+     * @param store the store that this property resides in
+     * @param value the value to assign
+     * @param shape the current shape of the object or {@code null}
+     * @throws IncompatibleLocationException if the value is incompatible with the property location
+     * @throws FinalLocationException if the location is final and values differ
+     * @see DynamicObject#set(Object, Object)
+     */
+    public abstract void set(DynamicObject store, Object value, Shape shape) throws IncompatibleLocationException, FinalLocationException;
+
+    /**
+     * Assigns value to this property of the object.
+     *
+     * Automatically relocates the property if the value cannot be assigned to its current location.
+     *
+     * @param shape the current shape of the object or {@code null}
+     */
+    public abstract void setGeneric(DynamicObject store, Object value, Shape shape);
+
+    /**
+     * Like {@link #set(DynamicObject, Object, Shape)}, but throws an {@link IllegalStateException}
+     * instead.
+     */
+    public abstract void setSafe(DynamicObject store, Object value, Shape shape);
+
+    /**
+     * Like {@link #setSafe}, but ignores the finalness of the property. For internal use only.
+     *
+     * @param store the store that this property resides in
+     * @param value the value to assign
+     */
+    public abstract void setInternal(DynamicObject store, Object value);
+
+    /**
+     * Assigns value to this property of the object, changing the object's shape.
+     *
+     * Combines {@link DynamicObject#setShapeAndGrow(Shape, Shape)} and
+     * {@link #set(DynamicObject, Object, Shape)} to an atomic operation.
+     *
+     * @param store the store that this property resides in
+     * @param value the value to assign
+     * @param oldShape the shape before the transition
+     * @param newShape the shape after the transition
+     * @throws IncompatibleLocationException if the value is incompatible with the property location
+     */
+    public abstract void set(DynamicObject store, Object value, Shape oldShape, Shape newShape) throws IncompatibleLocationException;
+
+    /**
+     * Assigns value to this property of the object, changing the object's shape.
+     *
+     * Combines {@link DynamicObject#setShapeAndGrow(Shape, Shape)} and
+     * {@link #setGeneric(DynamicObject, Object, Shape)} to an atomic operation.
+     *
+     * @param store the store that this property resides in
+     * @param value the value to assign
+     * @param oldShape the shape before the transition
+     * @param newShape the shape after the transition
+     */
+    public abstract void setGeneric(DynamicObject store, Object value, Shape oldShape, Shape newShape);
+
+    /**
+     * Assigns value to this property of the object, changing the object's shape.
+     *
+     * Combines {@link DynamicObject#setShapeAndGrow(Shape, Shape)} and
+     * {@link #setSafe(DynamicObject, Object, Shape)} to an atomic operation.
+     *
+     * @param store the store that this property resides in
+     * @param value the value to assign
+     * @param oldShape the shape before the transition
+     * @param newShape the shape after the transition
+     */
+    public abstract void setSafe(DynamicObject store, Object value, Shape oldShape, Shape newShape);
+
+    /**
+     * Returns {@code true} if this property and some other property have the same key and flags.
+     */
+    public abstract boolean isSame(Property other);
+
+    /**
+     * Get the property location.
+     */
+    public abstract Location getLocation();
+
+    /**
+     * Is this property hidden from iteration.
+     *
+     * @see HiddenKey
+     */
+    public abstract boolean isHidden();
+
+    public abstract boolean isShadow();
+
+    /**
+     * Create a copy of the property with the given flags.
+     */
+    public abstract Property copyWithFlags(int newFlags);
+
+    public abstract Property copyWithRelocatable(boolean newRelocatable);
+}