--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/spi/Virtualizable.java	2017-02-15 17:07:57.142069217 -0800
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2011, 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.spi;
+
+/**
+ * This interface allows a node to convey information about what its effect would be if some of its
+ * inputs were virtualized. The {@link #virtualize(VirtualizerTool)} method will only be called for
+ * nodes that have some interaction with virtualized nodes. However, the virtualized nodes might
+ * have been re-materialized in the meantime.
+ */
+public interface Virtualizable {
+
+    /**
+     * A node class can implement this method to convey information about what its effect would be
+     * if some of its inputs were virtualized. All modifications must be made through the supplied
+     * tool, and not directly on the node, because by the time this method is called the
+     * virtualized/non-virtualized state is still speculative and might not hold because of loops,
+     * etc.
+     *
+     * @param tool the tool used to describe the effects of this node
+     */
+    void virtualize(VirtualizerTool tool);
+}