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Truffle/Instrumentation: API revisions
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Tue, 29 Apr 2014 12:05:58 -0700
parents 0c6d8a08e31b
children bb9473723904
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1 /*
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2 * Copyright (c) 2013, 2014, 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.CompilerDirectives.CompilationFinal;
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28 import com.oracle.truffle.api.CompilerDirectives.SlowPath;
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29 import com.oracle.truffle.api.frame.*;
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30 import com.oracle.truffle.api.instrument.impl.*;
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31 import com.oracle.truffle.api.nodes.*;
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32
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33 /**
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34 * A receiver of Truffle AST {@link ExecutionEvents}, propagated from a {@link Probe} to which the
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35 * instrument is attached, for the benefit of associated <em>tools</em>.
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36 * <p>
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37 * Guidelines for implementing Instruments, with particular attention to avoiding undesired runtime
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38 * performance overhead:
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39 * <ol>
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40 * <li>Extend {@link Instrument} and override only the event handling methods for which some action
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41 * is needed.</li>
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42 * <li>Instruments are Truffle {@link Node}s and should be coded as much as possible in the desired
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43 * <em>Truffle style</em>, documented more thoroughly elsewhere.</li>
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44 * <li>Maintain as little state as possible.</li>
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45 * <li>If state is necessary, make it {@code final} if possible.</li>
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46 * <li>If non-final state is necessary, annotate it as {@link CompilationFinal} and call
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47 * {@linkplain InstrumentationNode#notifyProbeChanged(Instrument)} whenever it is modified.</li>
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48 * <li>Never store a {@link Frame} value in a field.</li>
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49 * <li>Minimize computation in standard execution paths.</li>
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50 * <li>Callbacks to tools should be made via callbacks provided at construction and stored in
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51 * {@code final} fields.</li>
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52 * <li>Tool callback methods should usually be annotated as {@link SlowPath} to prevent them from
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53 * being inlined into fast execution paths.</li>
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54 * <li>If computation is needed, and if performance is important, then the computation is best
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55 * expressed as a guest language AST and evaluated using standard Truffle mechanisms so that
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56 * standard Truffle optimizations can be applied.</li>
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57 * </ol>
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58 * <p>
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59 * Guidelines for attachment to a {@link Probe}:
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60 * <ol>
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61 * <li>An Instrument instance must only attached to a single {@link Probe}, each of which is
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62 * associated uniquely with a specific syntactic unit of a guest language program, and thus
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63 * (initially) to a specific {@linkplain Node Truffle AST node}.</li>
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64 * <li>When the AST containing such a node is copied at runtime, the {@link Probe} will be shared by
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65 * every copy, and so the Instrument will receive events corresponding to the intended syntactic
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66 * unit of code, independent of which AST copy is being executed.</li>
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67 * </ol>
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68 *
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69 * <p>
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70 * <strong>Disclaimer:</strong> experimental; under development.
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71 *
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72 * @see Instrumentation
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73 * @see Probe
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74 * @see Instrument
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75 * @see ASTNodeProber
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76 */
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77 public class Instrument extends InstrumentationNode {
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78
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79 protected Instrument() {
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80 }
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81
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82 public void enter(Node astNode, VirtualFrame frame) {
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83 }
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84
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85 public void leave(Node astNode, VirtualFrame frame) {
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86 }
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87
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88 public void leave(Node astNode, VirtualFrame frame, boolean result) {
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89 leave(astNode, frame, (Object) result);
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90 }
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91
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92 public void leave(Node astNode, VirtualFrame frame, byte result) {
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93 leave(astNode, frame, (Object) result);
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94 }
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95
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96 public void leave(Node astNode, VirtualFrame frame, short result) {
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97 leave(astNode, frame, (Object) result);
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98 }
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99
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100 public void leave(Node astNode, VirtualFrame frame, int result) {
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101 leave(astNode, frame, (Object) result);
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102 }
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103
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104 public void leave(Node astNode, VirtualFrame frame, long result) {
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105 leave(astNode, frame, (Object) result);
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106 }
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107
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108 public void leave(Node astNode, VirtualFrame frame, char result) {
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109 leave(astNode, frame, (Object) result);
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110 }
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111
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112 public void leave(Node astNode, VirtualFrame frame, float result) {
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113 leave(astNode, frame, (Object) result);
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114 }
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116 public void leave(Node astNode, VirtualFrame frame, double result) {
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117 leave(astNode, frame, (Object) result);
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120 public void leave(Node astNode, VirtualFrame frame, Object result) {
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123 public void leaveExceptional(Node astNode, VirtualFrame frame, Exception e) {
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