--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.object/src/com/oracle/truffle/object/DebugShapeVisitor.java	Tue Nov 18 23:19:43 2014 +0100
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2014, 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.
+ *
+ * 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.object;
+
+import java.util.*;
+
+import com.oracle.truffle.api.object.*;
+
+public abstract class DebugShapeVisitor<R> implements ShapeVisitor<R> {
+    public R visitShape(Shape shape) {
+        return visitShape(shape, Collections.unmodifiableMap(((ShapeImpl) shape).getTransitionMapForRead()));
+    }
+
+    public abstract R visitShape(Shape shape, Map<? extends Transition, ? extends Shape> transitions);
+
+    public static String getId(Shape shape) {
+        return Integer.toHexString(shape.hashCode());
+    }
+}