--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Layout.java	Tue Nov 18 16:18:45 2014 +0100
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2013, 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;
+
+import java.util.*;
+
+import com.oracle.truffle.api.nodes.NodeUtil.FieldOffsetProvider;
+import com.oracle.truffle.api.object.Shape.*;
+
+public abstract class Layout {
+    public static final EnumSet<ImplicitCast> NONE = EnumSet.noneOf(ImplicitCast.class);
+    public static final EnumSet<ImplicitCast> INT_TO_DOUBLE = EnumSet.of(ImplicitCast.IntToDouble);
+    public static final EnumSet<ImplicitCast> INT_TO_LONG = EnumSet.of(ImplicitCast.IntToLong);
+
+    public static final String OPTION_PREFIX = "truffle.object.";
+
+    private static final LayoutFactory LAYOUT_FACTORY = loadLayoutFactory();
+
+    public enum ImplicitCast {
+        IntToDouble,
+        IntToLong,
+    }
+
+    public static Layout createLayout() {
+        return createLayout(NONE);
+    }
+
+    public static Layout createLayout(EnumSet<ImplicitCast> allowedImplicitCasts) {
+        return new LayoutBuilder().setAllowedImplicitCasts(allowedImplicitCasts).build();
+    }
+
+    public static Layout createLayout(EnumSet<ImplicitCast> allowedImplicitCasts, FieldOffsetProvider fieldOffsetProvider) {
+        return new LayoutBuilder().setAllowedImplicitCasts(allowedImplicitCasts).setFieldOffsetProvider(fieldOffsetProvider).build();
+    }
+
+    public abstract DynamicObject newInstance(Shape shape);
+
+    public abstract Class<? extends DynamicObject> getType();
+
+    public abstract Shape createShape(ObjectType operations);
+
+    public abstract Shape createShape(ObjectType operations, Object sharedData);
+
+    public abstract Shape createShape(ObjectType operations, Object sharedData, int id);
+
+    /**
+     * Create an allocator for static property creation. Reserves all array extension slots.
+     */
+    public abstract Allocator createAllocator();
+
+    protected static LayoutFactory getFactory() {
+        return LAYOUT_FACTORY;
+    }
+
+    private static LayoutFactory loadLayoutFactory() {
+        LayoutFactory bestLayoutFactory = null;
+
+        String layoutFactoryImplClassName = System.getProperty(OPTION_PREFIX + "LayoutFactory");
+        if (layoutFactoryImplClassName != null) {
+            Class<?> clazz;
+            try {
+                clazz = Class.forName(layoutFactoryImplClassName);
+            } catch (ClassNotFoundException e) {
+                throw new RuntimeException(e);
+            }
+            try {
+                bestLayoutFactory = (LayoutFactory) clazz.newInstance();
+            } catch (InstantiationException | IllegalAccessException e) {
+                throw new AssertionError(e);
+            }
+        } else {
+            ServiceLoader<LayoutFactory> serviceLoader = ServiceLoader.load(LayoutFactory.class, Layout.class.getClassLoader());
+            for (LayoutFactory currentLayoutFactory : serviceLoader) {
+                if (bestLayoutFactory == null) {
+                    bestLayoutFactory = currentLayoutFactory;
+                } else if (currentLayoutFactory.getPriority() >= bestLayoutFactory.getPriority()) {
+                    assert currentLayoutFactory.getPriority() != bestLayoutFactory.getPriority();
+                    bestLayoutFactory = currentLayoutFactory;
+                }
+            }
+        }
+
+        if (bestLayoutFactory == null) {
+            throw new AssertionError("LayoutFactory not found");
+        }
+        return bestLayoutFactory;
+    }
+}