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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Instrument.java @ 19490:745ecef4c9cd
Truffle/Instrumentation: clean up the use of Assumptions in the Probe (and attached Instruments)
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 18:07:48 -0800 |
parents | 128586040207 |
children | b5467bb34b24 |
rev | line source |
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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.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 TruffleEventListener execution events} taking place at a {@link Node} in a Guest |
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37 * Language (GL) Truffle AST, and a {@linkplain TruffleEventListener listener}, 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 TruffleEventListener} 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(TruffleEventListener)}.</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 listener.</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 listener 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 listeners:</h4> |
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52 * <p> |
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53 * <ol> |
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54 * <li>Implement the interface {@link TruffleEventListener}. 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 DefaultEventListener}, which provides a no-op implementation of every |
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58 * {@link TruffleEventListener} method; override the methods of interest.</li> |
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59 * <li>Extend {@link SimpleEventListener}, 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 listener implementation:</h4> |
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64 * <p> |
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65 * When an Instrument is attached to a Probe, the listener effectively becomes part of the executing |
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66 * GL program; performance can be affected by the listener'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 listener 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 listener 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 * listener 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 listener 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 listener'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 listeners:</h4> |
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133 * <p> |
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134 * Although an Instrument may only be attached to a single Probe, a listener 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 listener. |
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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 TruffleEventListener |
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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 listener. |
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149 * |
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150 * @param listener a listener 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(TruffleEventListener listener, String instrumentInfo) { |
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155 return new Instrument(listener, 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 listener. |
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160 */ |
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161 public static Instrument create(TruffleEventListener listener) { |
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162 return new Instrument(listener, null); |
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163 } |
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164 |
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165 /** |
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166 * Tool-supplied listener for events. |
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167 */ |
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168 private final TruffleEventListener toolEventListener; |
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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(TruffleEventListener listener, String instrumentInfo) { |
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183 this.toolEventListener = listener; |
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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 TruffleEventListener, 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 @Override |
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252 public boolean isInstrumentable() { |
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253 return false; |
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254 } |
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255 |
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256 /** |
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257 * Gets the instrument that created this node. |
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258 */ |
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259 private Instrument getInstrument() { |
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260 return Instrument.this; |
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261 } |
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262 |
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263 /** |
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264 * Removes the node from this chain that was added by a particular instrument, assuming that |
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265 * the head of the chain is not the one to be replaced. This is awkward, but is required |
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266 * because {@link Node#replace(Node)} won't take a {@code null} argument. This doesn't work |
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267 * for the tail of the list, which would be replacing itself with null. So the replacement |
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268 * must be directed the parent of the node being removed. |
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269 */ |
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270 private boolean removeFromChain(Instrument instrument) { |
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271 assert getInstrument() != instrument; |
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272 if (nextInstrument == null) { |
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273 return false; |
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274 } |
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275 if (nextInstrument.getInstrument() == instrument) { |
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276 // Next is the one to remove |
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277 if (nextInstrument.nextInstrument == null) { |
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278 // Next is at the tail; just forget |
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279 nextInstrument = null; |
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280 } else { |
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281 // Replace next with its successor |
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282 nextInstrument.replace(nextInstrument.nextInstrument); |
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283 } |
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284 return true; |
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285 } |
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286 return nextInstrument.removeFromChain(instrument); |
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287 } |
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288 |
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289 public void enter(Node node, VirtualFrame frame) { |
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290 Instrument.this.toolEventListener.enter(node, frame); |
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291 if (nextInstrument != null) { |
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292 nextInstrument.enter(node, frame); |
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293 } |
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294 } |
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295 |
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296 public void returnVoid(Node node, VirtualFrame frame) { |
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297 Instrument.this.toolEventListener.returnVoid(node, frame); |
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298 if (nextInstrument != null) { |
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299 nextInstrument.returnVoid(node, frame); |
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300 } |
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301 } |
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302 |
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303 public void returnValue(Node node, VirtualFrame frame, Object result) { |
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304 Instrument.this.toolEventListener.returnValue(node, frame, result); |
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305 if (nextInstrument != null) { |
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306 nextInstrument.returnValue(node, frame, result); |
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307 } |
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308 } |
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309 |
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310 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) { |
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311 Instrument.this.toolEventListener.returnExceptional(node, frame, exception); |
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312 if (nextInstrument != null) { |
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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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
18131
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313 nextInstrument.returnExceptional(node, frame, exception); |
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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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
18131
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314 } |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
18131
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315 } |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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316 |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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317 public String instrumentationInfo() { |
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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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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318 if (Instrument.this.instrumentInfo != null) { |
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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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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319 return Instrument.this.instrumentInfo; |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
18131
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320 } |
19247
128586040207
Truffle/Instrumentation: TruffleEventReceiver renamed to TruffleEventListener
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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321 return toolEventListener.getClass().getSimpleName(); |
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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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
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322 } |
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Truffle/Instrumentation: API revisions
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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323 } |
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Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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324 |
0c6d8a08e31b
Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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325 } |