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Truffle: format fix.
author Christian Humer <christian.humer@gmail.com>
date Tue, 21 Oct 2014 00:30:06 +0200
parents b4e38f4ca414
children e3c95cbbb50c
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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.TruffleBoundary;
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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 runtime {@link ExecutionEvents}, propagated from the {@link Probe} to
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35 * which the 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 {@link Instrument}s, with particular attention to minimize runtime
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38 * performance overhead:
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39 * <ol>
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40 * <li>Extend this abstract class and override only the {@linkplain ExecutionEvents event handling
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41 * methods} for which intervention 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 object fields {@code final} if at all possible.</li>
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46 * <li>If non-final object-valued state is necessary, annotate it as {@link CompilationFinal} and
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47 * call {@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>If runtime calls must be made back to a tool, construct the instrument with a callback stored
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51 * in a {@code final} field.</li>
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52 * <li>Tool methods called by the instrument should be annotated as {@link TruffleBoundary} to
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53 * prevent them from being inlined into fast execution paths.</li>
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54 * <li>If computation in the execution path is needed, and if performance is important, then the
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55 * computation is best expressed as a guest language AST and evaluated using standard Truffle
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56 * mechanisms so that 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 * <p>
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69 * Guidelines for handling {@link ExecutionEvents}:
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70 * <ol>
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71 * <li>Separate event methods are defined for each kind of possible return: object-valued,
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72 * primitive-valued, void-valued, and exceptional.</li>
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73 * <li>Override "leave*" primitive methods if the language implementation returns primitives and the
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74 * instrument should avoid boxing them.</li>
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75 * <li>On the other hand, if boxing all primitives for instrumentation is desired, it is only
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76 * necessary to override the object-valued return methods, since the default implementation of each
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77 * primitive-valued return method is to box the value and forward it to the object-valued return
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78 * method.</li>
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79 * </ol>
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80 *
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81 * <p>
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82 * <strong>Disclaimer:</strong> experimental; under development.
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83 *
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84 * @see Probe
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85 * @see ASTNodeProber
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86 */
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87 public abstract class Instrument extends InstrumentationNode {
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88
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89 protected Instrument() {
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90 }
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91
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92 public void enter(Node astNode, VirtualFrame frame) {
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93 }
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94
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95 public void leave(Node astNode, VirtualFrame frame) {
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96 }
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97
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98 public void leave(Node astNode, VirtualFrame frame, boolean result) {
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99 leave(astNode, frame, (Object) result);
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100 }
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101
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102 public void leave(Node astNode, VirtualFrame frame, byte result) {
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103 leave(astNode, frame, (Object) result);
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104 }
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105
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106 public void leave(Node astNode, VirtualFrame frame, short result) {
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107 leave(astNode, frame, (Object) result);
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108 }
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109
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110 public void leave(Node astNode, VirtualFrame frame, int result) {
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111 leave(astNode, frame, (Object) result);
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112 }
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113
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114 public void leave(Node astNode, VirtualFrame frame, long result) {
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115 leave(astNode, frame, (Object) result);
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116 }
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117
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118 public void leave(Node astNode, VirtualFrame frame, char result) {
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119 leave(astNode, frame, (Object) result);
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120 }
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121
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122 public void leave(Node astNode, VirtualFrame frame, float result) {
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123 leave(astNode, frame, (Object) result);
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124 }
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125
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126 public void leave(Node astNode, VirtualFrame frame, double result) {
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127 leave(astNode, frame, (Object) result);
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128 }
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129
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130 public void leave(Node astNode, VirtualFrame frame, Object result) {
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131 }
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132
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133 public void leaveExceptional(Node astNode, VirtualFrame frame, Exception e) {
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134 }
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136 }