--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/AdvancedInstrumentRootFactory.java	Tue May 12 12:57:47 2015 -0700
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 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.  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.*;
+
+/**
+ * Creator of {@linkplain AdvancedInstrumentRoot AST fragments} suitable for efficient execution,
+ * subject to full Truffle optimization, by an
+ * {@linkplain Instrument#create(AdvancedInstrumentRootFactory, String) Advanced Instrument}.
+ *
+ * @see Instrument
+ * @see AdvancedInstrumentRoot
+ */
+public interface AdvancedInstrumentRootFactory {
+
+    /**
+     * Provider of {@linkplain AdvancedInstrumentRoot AST fragment} instances for efficient
+     * execution via instrumentation, subject to full Truffle optimization, at a {@linkplain Probe
+     * Probed} site in a guest-language AST.
+     *
+     * @param probe the Probe to which the Instrument requesting the AST fragment is attached
+     * @param node the guest-language AST location that is the context in which the requesting
+     *            Instrument must execute the AST fragment.
+     * @return a newly created AST fragment suitable for execution, via instrumentation, in the
+     *         execution context of the specified guest-language AST site.
+     */
+    AdvancedInstrumentRoot createInstrumentRoot(Probe probe, Node node);
+}