--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/LocationIdentity.java	Tue May 21 21:46:26 2013 +0200
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2011, 2012, 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.api.meta;
+
+/**
+ * Marker interface for location identities. Apart from the special values {@link #ANY_LOCATION} and
+ * {@link #FINAL_LOCATION}, a different location identity of two memory accesses guarantees that the
+ * two accesses do not interfere.
+ */
+public interface LocationIdentity {
+
+    /**
+     * Denotes any location. A write to such a location kills all values in a memory map during an
+     * analysis of memory accesses. A read from this location cannot be moved or coalesced with
+     * other reads because its interaction with other reads is not known.
+     */
+    LocationIdentity ANY_LOCATION = new NamedLocationIdentity("ANY_LOCATION");
+
+    /**
+     * Denotes the location of a value that is guaranteed to be final.
+     */
+    LocationIdentity FINAL_LOCATION = new NamedLocationIdentity("FINAL_LOCATION");
+
+}