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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Probe.java @ 20961:21298b90a6bf
Truffle/Instrumentation: Javadoc cleanup
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Tue, 14 Apr 2015 14:23:07 -0700 |
parents | f166d264af9f |
children | 7d21cdb15e54 |
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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 java.lang.ref.*; |
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28 import java.util.*; |
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29 |
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30 import com.oracle.truffle.api.*; |
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31 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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32 import com.oracle.truffle.api.instrument.InstrumentationNode.TruffleEvents; |
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33 import com.oracle.truffle.api.nodes.*; |
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34 import com.oracle.truffle.api.source.*; |
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35 import com.oracle.truffle.api.utilities.*; |
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36 |
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37 //TODO (mlvdv) these statics should not be global. Move them to some kind of context. |
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38 |
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39 /** |
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40 * A <em>binding</em> between: |
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41 * <ol> |
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42 * <li>A program location in an executing Truffle AST (defined by a {@link SourceSection}), and</li> |
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43 * <li>A dynamically managed collection of "attached" {@linkplain Instrument Instruments} that |
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44 * receive event notifications on behalf of external clients.</li> |
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45 * </ol> |
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46 * <p> |
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47 * Client-oriented documentation for the use of Probes is available online at <a |
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48 * HREF="https://wiki.openjdk.java.net/display/Graal/Finding+Probes" |
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49 * >https://wiki.openjdk.java.net/display/Graal/Finding+Probes</a> |
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50 * <p> |
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51 * <h4>Implementation notes:</h4> |
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52 * <p> |
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53 * <ul> |
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54 * <li>A Probe must be permanently associated with a <em>program location</em>, defined by a |
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55 * particular {@link SourceSection}, even though: |
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56 * <ul> |
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57 * <li>that location is represented in an AST as a {@link Node}, which might be replaced through |
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58 * optimizations such as specialization, and</li> |
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59 * <li>Truffle may <em>clone</em> the AST so that the location is actually represented by multiple |
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60 * Nodes in multiple ASTs.</li> |
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61 * </ul> |
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62 * </li> |
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63 * |
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64 * <li>The effect of the binding is to intercept {@linkplain TruffleEvents execution events} |
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65 * arriving at the "probed" AST Node and notify each attached {@link Instrument} before execution is |
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66 * allowed to proceed to the child and again after execution completes.</li> |
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67 * |
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68 * <li>The method {@link Node#probe()} creates a Probe on an AST Node; redundant calls return the |
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69 * same Probe.</li> |
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70 * |
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71 * <li>The "probing" of a Truffle AST must be done after the AST is complete (i.e. parent pointers |
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72 * correctly assigned), but before any cloning or executions. This is done by creating an instance |
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73 * of {@link ASTProber} and registering it via {@link #registerASTProber(ASTProber)}. Once |
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74 * registered, it will be applied automatically to every newly created AST.</li> |
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75 * |
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76 * <li>The "probing" of an AST Node is implemented by insertion of a {@link ProbeNode.WrapperNode} |
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77 * into the AST (as new parent of the Node being probed), together with an associated |
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78 * {@link ProbeNode} that routes execution events at the probed Node to all the |
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79 * {@linkplain Instrument Instruments} attached to the Probe's <em>instrument chain</em>.</li> |
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80 * |
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81 * <li>When Truffle clones an AST, any attached WrapperNodes and ProbeNodes are cloned as well, |
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82 * together with their attached instrument chains. Each Probe instance intercepts cloning events and |
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83 * keeps track of all AST copies.</li> |
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84 * |
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85 * <li>All attached {@link InstrumentationNode}s effectively become part of the running program: |
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86 * <ul> |
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87 * <li>Good News: instrumentation code implicitly benefits from every kind of Truffle optimization.</li> |
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88 * <li>Bad News: instrumentation code must be implemented carefully to avoid interfering with any |
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89 * Truffle optimizations.</li> |
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90 * </ul> |
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91 * </li> |
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92 * |
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93 * </ul> |
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94 * |
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95 * @see Instrument |
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96 * @see ASTProber |
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97 * @see ProbeListener |
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98 * @see SyntaxTag |
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99 */ |
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100 public final class Probe implements SyntaxTagged { |
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101 |
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102 private static final List<ASTProber> astProbers = new ArrayList<>(); |
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103 |
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104 private static final List<ProbeListener> probeListeners = new ArrayList<>(); |
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105 |
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106 /** |
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107 * All Probes that have been created. |
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108 */ |
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109 private static final List<WeakReference<Probe>> probes = new ArrayList<>(); |
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110 |
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111 @CompilationFinal private static SyntaxTagTrap tagTrap = null; |
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112 |
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113 private static final class FindSourceVisitor implements NodeVisitor { |
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114 |
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115 Source source = null; |
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116 |
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117 public boolean visit(Node node) { |
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118 final SourceSection sourceSection = node.getSourceSection(); |
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119 if (sourceSection != null) { |
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120 source = sourceSection.getSource(); |
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121 return false; |
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122 } |
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123 return true; |
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124 } |
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125 } |
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126 |
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127 /** |
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128 * Walks an AST, looking for the first node with an assigned {@link SourceSection} and returning |
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129 * the {@link Source}. |
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130 */ |
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131 private static Source findSource(Node node) { |
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132 final FindSourceVisitor visitor = new FindSourceVisitor(); |
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133 node.accept(visitor); |
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134 return visitor.source; |
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135 } |
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136 |
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137 /** |
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138 * Enables instrumentation at selected nodes in all subsequently constructed ASTs. |
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139 */ |
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140 public static void registerASTProber(ASTProber prober) { |
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141 astProbers.add(prober); |
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142 } |
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143 |
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144 public static void unregisterASTProber(ASTProber prober) { |
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145 astProbers.remove(prober); |
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146 } |
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147 |
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148 /** |
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149 * Enables instrumentation in a newly created AST by applying all registered instances of |
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150 * {@link ASTProber}. |
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151 */ |
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152 public static void applyASTProbers(Node node) { |
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153 |
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154 final Source source = findSource(node); |
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155 |
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156 for (ProbeListener listener : probeListeners) { |
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157 listener.startASTProbing(source); |
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158 } |
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159 for (ASTProber prober : astProbers) { |
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160 prober.probeAST(node); |
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161 } |
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162 for (ProbeListener listener : probeListeners) { |
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163 listener.endASTProbing(source); |
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164 } |
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165 } |
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166 |
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167 /** |
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168 * Adds a {@link ProbeListener} to receive events. |
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169 */ |
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170 public static void addProbeListener(ProbeListener listener) { |
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171 assert listener != null; |
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172 probeListeners.add(listener); |
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173 } |
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174 |
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175 /** |
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176 * Removes a {@link ProbeListener}. Ignored if listener not found. |
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177 */ |
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178 public static void removeProbeListener(ProbeListener listener) { |
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179 probeListeners.remove(listener); |
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180 } |
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181 |
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182 /** |
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183 * Returns all {@link Probe}s holding a particular {@link SyntaxTag}, or the whole collection of |
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184 * probes if the specified tag is {@code null}. |
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185 * |
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186 * @return A collection of probes containing the given tag. |
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187 */ |
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188 public static Collection<Probe> findProbesTaggedAs(SyntaxTag tag) { |
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189 final List<Probe> taggedProbes = new ArrayList<>(); |
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190 for (WeakReference<Probe> ref : probes) { |
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191 Probe probe = ref.get(); |
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192 if (probe != null) { |
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193 if (tag == null || probe.isTaggedAs(tag)) { |
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194 taggedProbes.add(ref.get()); |
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195 } |
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196 } |
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197 } |
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198 return taggedProbes; |
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199 } |
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200 |
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201 // TODO (mlvdv) can this be generalized to permit multiple traps without a performance hit? |
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202 /** |
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203 * Sets the current "tag trap"; there can be no more than one set at a time. |
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204 * <ul> |
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205 * <li>A non-null trap sets a callback to be triggered whenever execution reaches a |
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206 * {@link Probe} (either existing or subsequently created) with the specified tag.</li> |
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207 * <li>Setting the trap to null clears the existing trap.</li> |
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208 * <li>Setting a non-null trap when one is already set will clear the previously set trap.</li> |
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209 * </ul> |
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210 * |
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211 * @param newTagTrap The {@link SyntaxTagTrap} to set. |
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212 */ |
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213 public static void setTagTrap(SyntaxTagTrap newTagTrap) { |
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214 tagTrap = newTagTrap; |
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215 for (WeakReference<Probe> ref : probes) { |
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216 final Probe probe = ref.get(); |
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217 if (probe != null) { |
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218 probe.notifyTrapSet(); |
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219 } |
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220 } |
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221 } |
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222 |
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223 private final SourceSection sourceSection; |
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224 private final ArrayList<SyntaxTag> tags = new ArrayList<>(); |
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225 private final List<WeakReference<ProbeNode>> probeNodeClones = new ArrayList<>(); |
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226 |
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227 /* |
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228 * Invalidated whenever something changes in the Probe and its Instrument chain, so need deopt |
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229 */ |
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230 private final CyclicAssumption probeStateUnchangedCyclic = new CyclicAssumption("Probe state unchanged"); |
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231 |
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232 /* |
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233 * The assumption that nothing had changed in this probe, the last time anybody checked (when |
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234 * there may have been a deopt). Every time a check fails, gets replaced by a new unchanged |
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235 * assumption. |
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236 */ |
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237 @CompilationFinal private Assumption probeStateUnchangedAssumption = probeStateUnchangedCyclic.getAssumption(); |
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238 |
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239 // Must invalidate whenever this changes. |
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240 @CompilationFinal private boolean isTrapActive = false; |
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241 |
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242 /** |
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243 * Intended for use only by {@link ProbeNode}. |
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244 */ |
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245 Probe(ProbeNode probeNode, SourceSection sourceSection) { |
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246 this.sourceSection = sourceSection; |
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247 probes.add(new WeakReference<>(this)); |
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248 registerProbeNodeClone(probeNode); |
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249 for (ProbeListener listener : probeListeners) { |
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250 listener.newProbeInserted(this); |
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251 } |
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252 } |
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253 |
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254 public boolean isTaggedAs(SyntaxTag tag) { |
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255 assert tag != null; |
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256 return tags.contains(tag); |
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257 } |
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258 |
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259 public Collection<SyntaxTag> getSyntaxTags() { |
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260 return Collections.unmodifiableCollection(tags); |
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261 } |
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262 |
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263 /** |
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264 * Adds a {@linkplain SyntaxTag tag} to the set of tags associated with this {@link Probe}; |
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265 * {@code no-op} if already in the set. |
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266 */ |
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267 public void tagAs(SyntaxTag tag, Object tagValue) { |
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268 assert tag != null; |
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269 if (!tags.contains(tag)) { |
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270 tags.add(tag); |
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271 for (ProbeListener listener : probeListeners) { |
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272 listener.probeTaggedAs(this, tag, tagValue); |
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273 } |
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274 if (tagTrap != null && tag == tagTrap.getTag()) { |
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275 this.isTrapActive = true; |
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276 invalidateProbeUnchanged(); |
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277 } |
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278 } |
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279 } |
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280 |
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281 /** |
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282 * Adds instrumentation at this Probe. |
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283 * |
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284 * @param instrument an instrument not yet attached to a probe |
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285 * @throws IllegalStateException if the instrument has ever been attached before |
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286 */ |
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287 public void attach(Instrument instrument) throws IllegalStateException { |
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288 if (instrument.isDisposed()) { |
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289 throw new IllegalStateException("Attempt to attach disposed instrument"); |
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290 } |
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291 if (instrument.getProbe() != null) { |
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292 throw new IllegalStateException("Attampt to attach an already attached instrument"); |
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293 } |
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294 instrument.setAttachedTo(this); |
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295 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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296 final ProbeNode probeNode = ref.get(); |
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297 if (probeNode != null) { |
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298 probeNode.addInstrument(instrument); |
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299 } |
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300 } |
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301 invalidateProbeUnchanged(); |
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302 } |
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303 |
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304 /** |
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305 * Gets the {@link SourceSection} associated with the Guest Language AST node being |
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306 * instrumented, possibly {@code null}. |
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307 */ |
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308 public SourceSection getProbedSourceSection() { |
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309 return sourceSection; |
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310 } |
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311 |
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312 public String getShortDescription() { |
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313 final String location = sourceSection == null ? "<unknown>" : sourceSection.getShortDescription(); |
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314 return "Probe@" + location + getTagsDescription(); |
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315 } |
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316 |
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317 /** |
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318 * Internal method for removing and rendering inert a specific instrument previously attached at |
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319 * this Probe. |
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320 * |
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321 * @param instrument an instrument already attached |
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322 * @throws IllegalStateException if instrument not attached at this Probe |
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323 * @see Instrument#dispose() |
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324 */ |
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325 void disposeInstrument(Instrument instrument) throws IllegalStateException { |
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326 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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327 final ProbeNode probeNode = ref.get(); |
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328 if (probeNode != null) { |
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329 probeNode.removeInstrument(instrument); |
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330 } |
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331 } |
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332 invalidateProbeUnchanged(); |
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333 } |
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334 |
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335 /** |
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336 * Receives notification that a new clone of the instrument chain associated with this |
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337 * {@link Probe} has been created as a side-effect of AST cloning. |
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338 */ |
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339 void registerProbeNodeClone(ProbeNode probeNode) { |
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340 probeNodeClones.add(new WeakReference<>(probeNode)); |
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341 } |
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342 |
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343 /** |
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344 * Gets the currently active {@linkplain SyntaxTagTrap tagTrap}; {@code null} if not set. |
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345 */ |
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346 SyntaxTagTrap getTrap() { |
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347 checkProbeUnchanged(); |
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348 return isTrapActive ? tagTrap : null; |
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349 } |
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350 |
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351 /** |
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352 * To be called wherever in the Probe/Instrument chain there are dependencies on the probe |
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353 * state's @CompilatonFinal fields. |
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354 */ |
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355 void checkProbeUnchanged() { |
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356 try { |
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357 probeStateUnchangedAssumption.check(); |
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358 } catch (InvalidAssumptionException ex) { |
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359 // Failure creates an implicit deoptimization |
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360 // Get the assumption associated with the new probe state |
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361 this.probeStateUnchangedAssumption = probeStateUnchangedCyclic.getAssumption(); |
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362 } |
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363 } |
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364 |
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365 void invalidateProbeUnchanged() { |
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366 probeStateUnchangedCyclic.invalidate(); |
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367 } |
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368 |
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369 private void notifyTrapSet() { |
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370 this.isTrapActive = tagTrap != null && this.isTaggedAs(tagTrap.getTag()); |
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371 invalidateProbeUnchanged(); |
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372 } |
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373 |
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374 private String getTagsDescription() { |
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375 final StringBuilder sb = new StringBuilder(); |
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376 sb.append("["); |
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377 String prefix = ""; |
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378 for (SyntaxTag tag : tags) { |
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379 sb.append(prefix); |
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380 prefix = ","; |
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381 sb.append(tag.toString()); |
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382 } |
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383 sb.append("]"); |
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384 return sb.toString(); |
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385 } |
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386 } |