--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/DebugManager.java	Mon Feb 03 20:58:23 2014 -0800
@@ -0,0 +1,71 @@
+/*
+ * 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.debug;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.nodes.instrument.*;
+import com.oracle.truffle.api.nodes.instrument.InstrumentationProbeNode.ProbeChain;
+
+/**
+ * Language-agnostic access to AST-based debugging support.
+ * <p>
+ * <strong>Disclaimer:</strong> this interface is under development and will change.
+ */
+public interface DebugManager {
+
+    /**
+     * Informs the {@link DebugManager} that the Guest Language runtime is starting to load a
+     * source. Care should be taken to ensure that under any circumstance there is always a
+     * following call to {@link #notifyFinishedLoading(Source)} with the same argument.
+     */
+    void notifyStartLoading(Source source);
+
+    /**
+     * Informs the {@link DebugManager} that the Guest Language runtime has finished loading a
+     * source. Care should be taken to ensure that under any circumstance there is always a prior
+     * call to {@link #notifyStartLoading(Source)} with the same argument.
+     */
+    void notifyFinishedLoading(Source source);
+
+    /**
+     * Return a reference to the (canonical) instrumentation site associated with a particular
+     * source code location; this site will have effect on any Truffle/AST implementation
+     * corresponding to the source location, even if the AST is copied multiple times.
+     */
+    ProbeChain getProbeChain(SourceSection sourceSection);
+
+    /**
+     * Informs the {@link DebugManager} that Truffle execution has halted; execution will resume
+     * when this method returns.
+     * 
+     * @param astNode a guest language AST node that represents the current execution site, assumed
+     *            not to be any kind of {@link InstrumentationNode},
+     * @param frame execution frame at the site where execution suspended
+     */
+    void haltedAt(Node astNode, VirtualFrame frame);
+
+}