--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/memory/MemoryCheckpoint.java	2016-12-09 00:55:55.489335539 -0800
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2011, 2016, 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 org.graalvm.compiler.nodes.memory;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.nodes.FixedNode;
+import org.graalvm.compiler.nodes.FixedNodeInterface;
+
+/**
+ * This interface marks subclasses of {@link FixedNode} that kill a set of memory locations
+ * represented by location identities (i.e. change a value at one or more locations that belong to
+ * these location identities).
+ */
+public interface MemoryCheckpoint extends MemoryNode, FixedNodeInterface {
+
+    interface Single extends MemoryCheckpoint {
+
+        /**
+         * This method is used to determine which memory location is killed by this node. Returning
+         * the special value {@link LocationIdentity#any()} will kill all memory locations.
+         *
+         * @return the identity of the location killed by this node.
+         */
+        LocationIdentity getLocationIdentity();
+
+    }
+
+    interface Multi extends MemoryCheckpoint {
+
+        /**
+         * This method is used to determine which set of memory locations is killed by this node.
+         * Returning the special value {@link LocationIdentity#any()} will kill all memory
+         * locations.
+         *
+         * @return the identities of all locations killed by this node.
+         */
+        LocationIdentity[] getLocationIdentities();
+
+    }
+
+    class TypeAssertion {
+
+        public static boolean correctType(Node node) {
+            return !(node instanceof MemoryCheckpoint) || (node instanceof MemoryCheckpoint.Single ^ node instanceof MemoryCheckpoint.Multi);
+        }
+    }
+}