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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Instrument.java @ 18485:e3c95cbbb50c

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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sun, 23 Nov 2014 16:07:23 -0800
parents 85cec9cab17b
children 867058575979
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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
0c6d8a08e31b Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
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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
0c6d8a08e31b Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0c6d8a08e31b Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
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14 * version 2 for more details (a copy is included in the LICENSE file that
0c6d8a08e31b Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
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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.TruffleBoundary;
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28 import com.oracle.truffle.api.*;
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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 // TODO (mlvdv) migrate some of this to external documentation.
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34 /**
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35 * A dynamically added/removed binding between a {@link Probe}, which provides notification of
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36 * {@linkplain TruffleEventReceiver execution events} taking place at a {@link Node} in a Guest
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37 * Language (GL) Truffle AST, and a {@linkplain TruffleEventReceiver receiver}, which consumes
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38 * notifications on behalf of an external tool.
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39 * <p>
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40 * <h4>Summary: How to "instrument" an AST location:</h4>
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41 * <ol>
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42 * <li>Create an implementation of {@link TruffleEventReceiver} that responds to events on behalf of
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43 * a tool.</li>
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44 * <li>Create an Instrument via factory method {@link Instrument#create(TruffleEventReceiver)}.</li>
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45 * <li>"Attach" the Instrument to a Probe via {@link Probe#attach(Instrument)}, at which point event
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46 * notifications begin to arrive at the receiver.</li>
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47 * <li>When no longer needed, "detach" the Instrument via {@link Instrument#dispose()}, at which
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48 * point event notifications to the receiver cease, and the Instrument becomes unusable.</li>
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49 * </ol>
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50 * <p>
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51 * <h4>Options for creating receivers:</h4>
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52 * <p>
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53 * <ol>
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54 * <li>Implement the interface {@link TruffleEventReceiver}. The event handling methods account for
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55 * both the entry into an AST node (about to call) and several possible kinds of exit from an AST
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56 * node (just returned).</li>
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57 * <li>Extend {@link DefaultEventReceiver}, which provides a no-op implementation of every
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58 * {@link TruffleEventReceiver} method; override the methods of interest.</li>
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59 * <li>Extend {@link SimpleEventReceiver}, where return values are ignored so only two methods (for
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60 * "enter" and "return") will notify all events.</li>
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61 * </ol>
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62 * <p>
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63 * <h4>General guidelines for receiver implementation:</h4>
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64 * <p>
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65 * When an Instrument is attached to a Probe, the receiver effectively becomes part of the executing
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66 * GL program; performance can be affected by the receiver's implementation.
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67 * <ul>
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68 * <li>Do not store {@link Frame} or {@link Node} references in fields.</li>
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69 * <li>Prefer {@code final} fields and (where performance is important) short methods.</li>
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70 * <li>If needed, pass along the {@link VirtualFrame} reference from an event notification as far as
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71 * possible through code that is expected to be inlined, since this incurs no runtime overhead. When
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72 * access to frame data is needed, substitute a more expensive {@linkplain Frame#materialize()
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73 * materialized} representation of the frame.</li>
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74 * <li>If a receiver calls back to its tool during event handling, and if performance is an issue,
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75 * then this should be through a final "callback" field in the instrument, and the called methods
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76 * should be minimal.</li>
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77 * <li>On the other hand, implementations should prevent Truffle from inlining beyond a reasonable
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78 * point with the method annotation {@link TruffleBoundary}.</li>
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79 * <li>The implicit "outer" pointer in a non-static inner class is a useful way to implement
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80 * callbacks to owner tools.</li>
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81 * <li>Primitive-valued return events are boxed for notification, but Truffle will eliminate the
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82 * boxing if they are cast back to their primitive values quickly (in particular before crossing any
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83 * {@link TruffleBoundary} annotations).
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84 * </ul>
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85 * <p>
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86 * <h4>Allowing for AST cloning:</h4>
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87 * <p>
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88 * Truffle routinely <em>clones</em> ASTs, which has consequences for receiver implementation.
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89 * <ul>
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90 * <li>Even though a {@link Probe} is uniquely associated with a particular location in the
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91 * executing Guest Language program, execution events at that location will in general be
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92 * implemented by different {@link Node} instances, i.e. <em>clones</em> of the originally probed
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93 * node.</li>
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94 * <li>Because of <em>cloning</em> the {@link Node} supplied with notifications to a particular
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95 * receiver will vary, but because they all represent the same GL program location the events should
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96 * be treated as equivalent for most purposes.</li>
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97 * </ul>
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98 * <p>
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99 * <h4>Access to execution state:</h4>
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100 * <p>
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101 * <ul>
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102 * <li>Event notification arguments provide primary access to the GL program's execution states:
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103 * <ul>
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104 * <li>{@link Node}: the concrete node (in one of the AST's clones) from which the event originated.
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105 * </li>
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106 * <li>{@link VirtualFrame}: the current execution frame.
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107 * </ul>
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108 * <li>Some global information is available, for example the execution
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109 * {@linkplain TruffleRuntime#iterateFrames(FrameInstanceVisitor) stack}.</li>
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110 * <li>Additional information needed by a receiver could be stored when created, preferably
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111 * {@code final} of course. For example, a reference to the {@link Probe} to which the receiver's
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112 * Instrument has been attached would give access to its corresponding
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113 * {@linkplain Probe#getProbedSourceSection() source location} or to the collection of
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114 * {@linkplain SyntaxTag tags} currently applied to the Probe.</li>
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115 * </ul>
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116 * <p>
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117 * <h4>Activating and deactivating Instruments:</h4>
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118 * <p>
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119 * Instruments are <em>single-use</em>:
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120 * <ul>
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121 * <li>An instrument becomes active only when <em>attached</em> to a Probe via
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122 * {@link Probe#attach(Instrument)}, and it may only be attached to a single Probe. It is a runtime
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123 * error to attempt attaching a previously attached instrument.</li>
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124 * <li>Attaching an instrument modifies every existing clone of the AST to which it is being
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125 * attached, which can trigger deoptimization.</li>
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126 * <li>The method {@link Instrument#dispose()} makes an instrument inactive by removing it from the
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127 * Probe to which it was attached and rendering it permanently inert.</li>
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128 * <li>Disposal removes the implementation of an instrument from all ASTs to which it was attached,
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129 * which can trigger deoptimization.</li>
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130 * </ul>
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131 * <p>
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132 * <h4>Sharing receivers:</h4>
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133 * <p>
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134 * Although an Instrument may only be attached to a single Probe, a receiver can be shared among
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135 * multiple Instruments. This can be useful for observing events that might happen at different
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136 * locations in a single AST, for example all assignments to a particular variable. In this case a
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137 * new Instrument would be created and attached at each assignment node, but all the Instruments
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138 * would be created with the same receiver.
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139 * <p>
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140 * <strong>Disclaimer:</strong> experimental; under development.
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141 *
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142 * @see Probe
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143 * @see TruffleEventReceiver
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144 */
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145 public final class Instrument {
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146
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147 /**
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148 * Creates an instrument that will route execution events to a receiver.
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149 *
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150 * @param receiver a receiver for event generated by the instrument
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151 * @param instrumentInfo optional description of the instrument's role
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152 * @return a new instrument, ready for attachment at a probe
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153 */
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154 public static Instrument create(TruffleEventReceiver receiver, String instrumentInfo) {
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155 return new Instrument(receiver, instrumentInfo);
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156 }
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157
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158 /**
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159 * Creates an instrument that will route execution events to a receiver.
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160 */
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161 public static Instrument create(TruffleEventReceiver receiver) {
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162 return new Instrument(receiver, null);
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163 }
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164
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165 /**
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166 * Tool-supplied receiver of events.
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167 */
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168 private final TruffleEventReceiver toolEventreceiver;
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169
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170 /**
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171 * Optional documentation, mainly for debugging.
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172 */
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173 private final String instrumentInfo;
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174
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175 /**
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176 * Has this instrument been disposed? stays true once set.
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177 */
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178 private boolean isDisposed = false;
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179
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180 private Probe probe = null;
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181
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182 private Instrument(TruffleEventReceiver receiver, String instrumentInfo) {
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183 this.toolEventreceiver = receiver;
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184 this.instrumentInfo = instrumentInfo;
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185 }
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186
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187 /**
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188 * Removes this instrument (and any clones) from the probe to which it attached and renders the
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189 * instrument inert.
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190 *
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191 * @throws IllegalStateException if this instrument has already been disposed
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192 */
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193 public void dispose() throws IllegalStateException {
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194 if (isDisposed) {
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195 throw new IllegalStateException("Attempt to dispose an already disposed Instrumennt");
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196 }
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197 if (probe != null) {
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198 // It's attached
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199 probe.disposeInstrument(this);
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200 }
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201 this.isDisposed = true;
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202 }
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203
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204 Probe getProbe() {
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205 return probe;
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206 }
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207
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208 void setAttachedTo(Probe probe) {
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209 this.probe = probe;
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210 }
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211
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212 /**
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213 * Has this instrument been disposed and rendered unusable?
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214 */
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215 boolean isDisposed() {
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216 return isDisposed;
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217 }
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218
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219 InstrumentNode addToChain(InstrumentNode nextNode) {
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220 return new InstrumentNode(nextNode);
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221 }
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222
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223 /**
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224 * Removes this instrument from an instrument chain.
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225 */
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226 InstrumentNode removeFromChain(InstrumentNode instrumentNode) {
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227 boolean found = false;
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228 if (instrumentNode != null) {
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229 if (instrumentNode.getInstrument() == this) {
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230 // Found the match at the head of the chain
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231 return instrumentNode.nextInstrument;
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232 }
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233 // Match not at the head of the chain; remove it.
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234 found = instrumentNode.removeFromChain(Instrument.this);
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235 }
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236 if (!found) {
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237 throw new IllegalStateException("Couldn't find instrument node to remove: " + this);
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238 }
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239 return instrumentNode;
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240 }
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241
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242 @NodeInfo(cost = NodeCost.NONE)
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243 final class InstrumentNode extends Node implements TruffleEventReceiver, InstrumentationNode {
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244
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245 @Child private InstrumentNode nextInstrument;
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246
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247 private InstrumentNode(InstrumentNode nextNode) {
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248 this.nextInstrument = nextNode;
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249 }
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250
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251 /**
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252 * Gets the instrument that created this node.
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253 */
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254 private Instrument getInstrument() {
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255 return Instrument.this;
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256 }
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257
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258 /**
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259 * Removes the node from this chain that was added by a particular instrument, assuming that
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260 * the head of the chain is not the one to be replaced. This is awkward, but is required
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261 * because {@link Node#replace(Node)} won't take a {@code null} argument. This doesn't work
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262 * for the tail of the list, which would be replacing itself with null. So the replacement
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263 * must be directed the parent of the node being removed.
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264 */
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265 private boolean removeFromChain(Instrument instrument) {
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266 assert getInstrument() != instrument;
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267 if (nextInstrument == null) {
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268 return false;
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269 }
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270 if (nextInstrument.getInstrument() == instrument) {
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271 // Next is the one to remove
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272 if (nextInstrument.nextInstrument == null) {
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273 // Next is at the tail; just forget
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274 nextInstrument = null;
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275 } else {
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276 // Replace next with its successor
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277 nextInstrument.replace(nextInstrument.nextInstrument);
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278 }
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279 return true;
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280 }
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281 return nextInstrument.removeFromChain(instrument);
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282 }
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283
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284 public void enter(Node node, VirtualFrame frame) {
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285 Instrument.this.toolEventreceiver.enter(node, frame);
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286 if (nextInstrument != null) {
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287 nextInstrument.enter(node, frame);
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288 }
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289 }
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290
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291 public void returnVoid(Node node, VirtualFrame frame) {
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292 Instrument.this.toolEventreceiver.returnVoid(node, frame);
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293 if (nextInstrument != null) {
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294 nextInstrument.returnVoid(node, frame);
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295 }
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296 }
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297
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298 public void returnValue(Node node, VirtualFrame frame, Object result) {
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299 Instrument.this.toolEventreceiver.returnValue(node, frame, result);
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300 if (nextInstrument != null) {
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301 nextInstrument.returnValue(node, frame, result);
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302 }
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303 }
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304
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305 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) {
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306 Instrument.this.toolEventreceiver.returnExceptional(node, frame, exception);
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307 if (nextInstrument != null) {
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308 nextInstrument.returnExceptional(node, frame, exception);
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309 }
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310 }
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311
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312 public String instrumentationInfo() {
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313 if (Instrument.this.instrumentInfo != null) {
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314 return Instrument.this.instrumentInfo;
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315 }
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316 return toolEventreceiver.getClass().getSimpleName();
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317 }
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318 }
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319
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320 }