--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.graph/src/com/oracle/graal/graph/CachedGraph.java	Tue May 19 14:00:11 2015 +0200
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2015, 2015, 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.graal.graph;
+
+/**
+ * This class is a container of a graph that needs to be readonly and optionally a lazily created
+ * mutable copy of the graph.
+ */
+public class CachedGraph {
+
+    private final Graph readonlyCopy;
+    private Graph mutableCopy;
+
+    public CachedGraph(Graph readonlyCopy) {
+        this.readonlyCopy = readonlyCopy;
+    }
+
+    public Graph getReadonlyCopy() {
+        return readonlyCopy;
+    }
+
+    public Graph getMutableCopy() {
+        if (mutableCopy == null) {
+            mutableCopy = readonlyCopy.copy();
+        }
+        return mutableCopy;
+    }
+}