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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/WrapperNode.java @ 22226:c896a8e70777

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Truffle/Instrumentation: Redesign instrumentation node classes to reduce the public API exposure. - ProbeNode is no longer public - Public interface InstrumentationNode.TruffleEvents is now abstract class EventHandlerNode with package private constructor - Interface ProbeNode.WrapperNode is no longer inside ProbeNode and has been expanded slightly so ProbeNode can be package private
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sun, 20 Sep 2015 15:51:39 -0700
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children c1c9c6d79f40
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1 /*
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2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.instrument;
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26
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27 import com.oracle.truffle.api.TruffleLanguage;
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28 import com.oracle.truffle.api.nodes.Node;
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29
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30 /**
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31 * A {@link Node} instance that must be inserted into a Truffle AST in order to enable
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32 * {@linkplain Instrument instrumentation} at a particular Guest Language (GL) node. Implementations
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33 * must ensure that {@link TruffleLanguage#isInstrumentable(Node)} returns {@code false}.
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34 * <p>
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35 * The implementation must be GL-specific. A wrapper <em>decorates</em> a GL AST node (the wrapper's
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36 * <em>child</em>) by acting as a transparent <em>proxy</em> with respect to the GL's execution
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37 * semantics.
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38 * <p>
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39 * Instrumentation at the wrapped node is implemented by an instance of {@link EventHandlerNode}
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40 * attached as a second child of the {@link WrapperNode}.
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41 * <p>
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42 * A wrapper is obliged to notify its attached {@link EventHandlerNode} when execution events occur
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43 * at the wrapped AST node during program execution.
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44 * <p>
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45 * When a GL AST is cloned, the {@link WrapperNode}, its {@link EventHandlerNode} and any
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46 * {@linkplain Instrument instrumentation} are also cloned; they are in effect part of the GL AST.
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47 * An instance of {@link Probe} represents abstractly the instrumentation at a particular location
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48 * in a GL AST; it tracks all the copies of the Wrapper and attached instrumentation, and acts as a
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49 * single point of access for tools.
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50 * <p>
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51 * Implementation guidelines:
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52 * <ol>
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53 * <li>Each GL implementation must implement a WrapperNode implementation for each AST context in
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54 * which Instrumentation is to be supported.</li>
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55 * <li>The wrapper type should descend from the <em>GL-specific node class</em>.</li>
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56 * <li>Must have a field: {@code @Child private <GL>Node child;}</li>
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57 * <li>Must have a field: {@code @Child private EventHandlerNode eventHandlerNode;}</li>
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58 * <li>The wrapper must act as a <em>proxy</em> for its child, which means implementing every
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59 * possible <em>execute-</em> method that gets called on guest language AST node types by their
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60 * parents, and passing along each call to its child.</li>
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61 * <li>Method {@code Probe getProbe()} should be implemented as {@code eventHandlerNode.getProbe();}
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62 * <li>Method {@code insertProbe(EventHandlerNode)} should be implemented as
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63 * {@code this.eventHandlerNode=insert(eventHandlerNode);}</li>
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64 * <li>Most importantly, Wrappers must be implemented so that Truffle optimization will reduce their
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65 * runtime overhead to zero when there are no attached {@link Instrument}s.</li>
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66 * </ol>
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67 * <p>
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68 *
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69 * @see Instrument
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70 */
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71 public interface WrapperNode extends InstrumentationNode {
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72
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73 /**
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74 * Gets the node being "wrapped", i.e. the AST node for which
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75 * {@linkplain InstrumentationNode.EventHandlerNode execution events} will be reported through
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76 * the Instrumentation Framework.
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77 */
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78 Node getChild();
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79
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80 /**
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81 * Gets the {@link Probe} responsible for installing this wrapper.
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82 */
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83 Probe getProbe();
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84
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85 /**
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86 * Implementation support for completing a newly created wrapper node.
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87 */
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88 void insertEventHandlerNode(EventHandlerNode eventHandlerNode);
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89 }