--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Wrapper.java	Sun Apr 20 20:37:27 2014 -0700
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2013, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.api.instrument;
+
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * A node that can be inserted into a Truffle AST in order to attach <em>instrumentation</em> at a
+ * particular node.
+ * <p>
+ * A wrapper <em>decorates</em> an AST node (its <em>child</em>) by acting as a transparent
+ * <em>proxy</em> for the child with respect to Truffle execution semantics.
+ * <p>
+ * A wrapper is also expected to notify its associated {@link Probe} when certain
+ * {@link ExecutionEvents} occur at the wrapper during program execution.
+ * <p>
+ * The wrapper's {@link Probe} is shared by every copy of the wrapper made when the AST is copied.
+ * <p>
+ * Wrappers methods must be amenable to Truffle/Graal inlining.
+ * <p>
+ * <strong>Disclaimer:</strong> experimental interface under development.
+ */
+public interface Wrapper extends PhylumTagged {
+
+    /**
+     * Gets the AST node being instrumented, which should never be an instance of {@link Wrapper}.
+     */
+    Node getChild();
+
+    /**
+     * Gets the {@link Probe} to which events occurring at this wrapper's child are propagated.
+     */
+    Probe getProbe();
+
+}