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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Probe.java @ 18485: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.
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Sun, 23 Nov 2014 16:07:23 -0800 |
parents | c4f374adce13 |
children | 867058575979 |
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Truffle: Major cleanup and extension of the Truffle Instrumentation framework in com.oracle.truffle.api
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1 /* |
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.instrument; |
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26 |
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27 import 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.instrument.ProbeNode.Instrumentable; |
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32 import com.oracle.truffle.api.nodes.*; |
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33 import com.oracle.truffle.api.source.*; |
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34 import com.oracle.truffle.api.utilities.*; |
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35 |
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36 //TODO (mlvdv) migrate some of this to external documentation. |
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37 /** |
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38 * A binding between a particular location in the Truffle AST representation of a running Guest |
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39 * Language (GL) program (i.e. a {@link Node}) and a dynamically managed collection of "attached" |
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40 * {@linkplain Instrument instrumentation} for use by external tools. |
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41 * <p> |
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42 * The effect of a binding is to intercept {@linkplain TruffleEventReceiver execution events} at the |
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43 * node and notify each attached {@link Instrument} before execution is allowed to resume. |
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44 * <p> |
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45 * A Probe is "inserted" into a GL node via a call to {@link Instrumentable#probe()}; a GL node must |
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46 * implement {@link Instrumentable} in order to support instrumentation. No more than one Probe can |
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47 * be inserted at a node. |
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48 * <p> |
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49 * The "probing" of a Truffle AST must be done after it is complete (i.e. with parent pointers |
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50 * correctly assigned), but before any executions. This is done by creating an instance of |
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51 * {@link ASTProber} and registering it via {@link #registerASTProber(ASTProber)}, after which it |
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52 * will be automatically applied to newly created ASTs. |
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53 * <p> |
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54 * Each Probe may also have assigned to it one or more {@link SyntaxTag}s, for example identifying a |
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55 * node as a {@linkplain StandardSyntaxTag#STATEMENT STATEMENT}. Tags can be queried by tools to |
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56 * configure behavior relevant to each probed node. |
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57 * <p> |
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58 * Instrumentation is implemented by modifying ASTs, both by inserting nodes into each AST at probed |
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59 * locations and by attaching additional nodes that implement dynamically attached instruments. |
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60 * Attached instrumentation code become, in effect, part of the GL program, and is subject to the |
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61 * same levels of optimization as other GL code. This implementation accounts properly for the fact |
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62 * that Truffle frequently <em>clones</em> ASTs, along with any attached instrumentation nodes. A |
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63 * Probe, along with attached Instruments, represents a <em>logical</em> binding with a source code |
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64 * location, producing event notifications that are (mostly) independent of which AST clone is |
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65 * executing. |
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66 * |
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67 * @see Instrument |
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68 * @see Instrumentable |
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69 * @see ASTProber |
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70 */ |
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71 public final class Probe implements SyntaxTagged { |
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72 |
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73 /** |
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74 * An observer of events related to {@link Probe}s: creating and tagging. |
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75 */ |
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76 public interface ProbeListener { |
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77 |
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78 /** |
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79 * Notifies that all registered {@link ASTProber}s are about to be applied to a newly |
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80 * constructed AST. |
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81 * |
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82 * @param source source code from which the AST was constructed |
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83 */ |
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84 void startASTProbing(Source source); |
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85 |
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86 /** |
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87 * Notifies that a {@link Probe} has been newly attached to an AST via |
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88 * {@link Instrumentable#probe()}. |
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89 * <p> |
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90 * There can be no more than one {@link Probe} at a node; this notification will only be |
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91 * delivered the first time {@linkplain Instrumentable#probe() probe()} is called at a |
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92 * particular AST node. There will also be no notification when the AST to which the Probe |
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93 * is attached is cloned. |
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94 */ |
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95 void newProbeInserted(Probe probe); |
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96 |
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97 /** |
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98 * Notifies that a {@link SyntaxTag} has been newly added to the set of tags associated with |
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99 * a {@link Probe} via {@link Probe#tagAs(SyntaxTag, Object)}. |
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100 * <p> |
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101 * The {@linkplain SyntaxTag tags} at a {@link Probe} are a <em>set</em>; this notification |
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102 * will only be delivered the first time a particular {@linkplain SyntaxTag tag} is added at |
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103 * a {@link Probe}. |
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104 * <p> |
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105 * An optional value supplied with {@linkplain Probe#tagAs(SyntaxTag, Object) |
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106 * tagAs(SyntaxTag, Object)} is reported to all listeners, but not stored. As a consequence, |
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107 * the optional value will have no effect at all if the tag had already been added. |
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108 * |
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109 * @param probe where a tag has been added |
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110 * @param tag the tag that has been newly added (subsequent additions of the tag are |
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111 * unreported). |
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112 * @param tagValue an optional value associated with the tag for the purposes of reporting. |
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113 */ |
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114 void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue); |
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115 |
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116 /** |
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117 * Notifies that the application of all registered {@link ASTProber}s to a newly constructed |
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118 * AST has completed. |
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119 * |
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120 * @param source source code from which the AST was constructed |
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121 */ |
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122 void endASTProbing(Source source); |
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123 |
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124 } |
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125 |
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126 private static final List<ASTProber> astProbers = new ArrayList<>(); |
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127 |
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128 private static final List<ProbeListener> probeListeners = new ArrayList<>(); |
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129 |
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130 /** |
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131 * All Probes that have been created. |
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132 */ |
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133 private static final List<WeakReference<Probe>> probes = new ArrayList<>(); |
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134 |
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135 private static final class FindSourceVisitor implements NodeVisitor { |
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136 |
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137 Source source = null; |
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138 |
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139 public boolean visit(Node node) { |
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140 final SourceSection sourceSection = node.getSourceSection(); |
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141 if (sourceSection != null) { |
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142 source = sourceSection.getSource(); |
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143 return false; |
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144 } |
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145 return true; |
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146 } |
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147 } |
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148 |
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149 /** |
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150 * Walks an AST, looking for the first node with an assigned {@link SourceSection} and returning |
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151 * the {@link Source}. |
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152 */ |
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153 private static Source findSource(Node node) { |
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154 final FindSourceVisitor visitor = new FindSourceVisitor(); |
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155 node.accept(visitor); |
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156 return visitor.source; |
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157 } |
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158 |
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159 /** |
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160 * The tag trap is a global setting; it only affects {@linkplain Probe probes} with the |
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161 * {@linkplain SyntaxTag tag} specified . |
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162 */ |
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163 private static SyntaxTagTrap globalTagTrap = null; |
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164 |
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165 /** |
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166 * Enables instrumentation at selected nodes in all subsequently constructed ASTs. |
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167 */ |
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168 public static void registerASTProber(ASTProber prober) { |
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169 astProbers.add(prober); |
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170 } |
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171 |
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172 public static void unregisterASTProber(ASTProber prober) { |
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173 astProbers.remove(prober); |
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174 } |
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175 |
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176 /** |
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177 * Enables instrumentation in a newly created AST by applying all registered instances of |
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178 * {@link ASTProber}. |
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179 */ |
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180 public static void applyASTProbers(Node node) { |
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181 |
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182 final Source source = findSource(node); |
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183 |
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184 for (ProbeListener listener : probeListeners) { |
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185 listener.startASTProbing(source); |
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186 } |
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187 for (ASTProber prober : astProbers) { |
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188 prober.probeAST(node); |
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189 } |
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190 for (ProbeListener listener : probeListeners) { |
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191 listener.endASTProbing(source); |
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192 } |
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193 } |
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194 |
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195 /** |
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196 * Adds a {@link ProbeListener} to receive events. |
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197 */ |
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198 public static void addProbeListener(ProbeListener listener) { |
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199 assert listener != null; |
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200 probeListeners.add(listener); |
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201 } |
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202 |
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203 /** |
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204 * Removes a {@link ProbeListener}. Ignored if listener not found. |
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205 */ |
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206 public static void removeProbeListener(ProbeListener listener) { |
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207 probeListeners.remove(listener); |
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208 } |
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209 |
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210 /** |
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211 * Returns all {@link Probe}s holding a particular {@link SyntaxTag}, or the whole collection if |
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212 * the specified tag is {@code null}. |
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213 * |
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214 * @return A collection of probes containing the given tag. |
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215 */ |
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216 public static Collection<Probe> findProbesTaggedAs(SyntaxTag tag) { |
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217 final List<Probe> taggedProbes = new ArrayList<>(); |
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218 for (WeakReference<Probe> ref : probes) { |
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219 Probe probe = ref.get(); |
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220 if (probe != null) { |
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221 if (tag == null || probe.isTaggedAs(tag)) { |
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222 taggedProbes.add(ref.get()); |
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223 } |
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224 } |
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225 } |
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226 return taggedProbes; |
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227 } |
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228 |
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229 /** |
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230 * Sets the current "tag trap". This causes a callback to be triggered whenever execution |
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231 * reaches a {@link Probe} (either existing or subsequently created) with the specified tag. |
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232 * There can only be one tag trap set at a time. |
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233 * |
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234 * @param newTagTrap The {@link SyntaxTagTrap} to set. |
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235 * @throws IllegalStateException if a trap is currently set. |
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236 */ |
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237 public static void setTagTrap(SyntaxTagTrap newTagTrap) throws IllegalStateException { |
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238 assert newTagTrap != null; |
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239 if (globalTagTrap != null) { |
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240 throw new IllegalStateException("trap already set"); |
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241 } |
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242 globalTagTrap = newTagTrap; |
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243 |
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244 final SyntaxTag newTag = newTagTrap.getTag(); |
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245 for (WeakReference<Probe> ref : probes) { |
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246 final Probe probe = ref.get(); |
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247 if (probe != null && probe.tags.contains(newTag)) { |
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248 probe.trapActive = true; |
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249 probe.probeStateUnchanged.invalidate(); |
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250 } |
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251 } |
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252 } |
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253 |
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254 /** |
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255 * Clears the current {@link SyntaxTagTrap}. |
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256 * |
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257 * @throws IllegalStateException if no trap is currently set. |
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258 */ |
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259 public static void clearTagTrap() { |
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260 if (globalTagTrap == null) { |
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261 throw new IllegalStateException("no trap set"); |
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262 } |
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263 globalTagTrap = null; |
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264 |
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265 for (WeakReference<Probe> ref : probes) { |
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266 final Probe probe = ref.get(); |
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267 if (probe != null && probe.trapActive) { |
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268 probe.trapActive = false; |
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269 probe.probeStateUnchanged.invalidate(); |
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270 } |
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271 } |
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272 } |
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273 |
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274 private final SourceSection sourceSection; |
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275 private final ArrayList<SyntaxTag> tags = new ArrayList<>(); |
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276 private final List<WeakReference<ProbeNode>> probeNodeClones = new ArrayList<>(); |
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277 private final CyclicAssumption probeStateUnchanged = new CyclicAssumption("Probe state unchanged"); |
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278 |
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279 /** |
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280 * {@code true} iff the global trap is set and this probe has the matching tag. |
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281 */ |
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282 private boolean trapActive = false; |
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283 |
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284 /** |
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285 * @see Instrumentable#probe() |
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286 */ |
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287 Probe(ProbeNode probeNode, SourceSection sourceSection) { |
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288 this.sourceSection = sourceSection; |
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289 probes.add(new WeakReference<>(this)); |
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290 registerProbeNodeClone(probeNode); |
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291 for (ProbeListener listener : probeListeners) { |
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292 listener.newProbeInserted(this); |
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293 } |
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294 } |
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295 |
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296 public boolean isTaggedAs(SyntaxTag tag) { |
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297 assert tag != null; |
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298 return tags.contains(tag); |
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299 } |
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300 |
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301 public Collection<SyntaxTag> getSyntaxTags() { |
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302 return Collections.unmodifiableCollection(tags); |
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303 } |
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304 |
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305 /** |
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306 * Adds a {@linkplain SyntaxTag tag} to the set of tags associated with this {@link Probe}; |
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307 * {@code no-op} if already in the set. |
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308 */ |
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309 public void tagAs(SyntaxTag tag, Object tagValue) { |
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310 assert tag != null; |
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311 if (!tags.contains(tag)) { |
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312 tags.add(tag); |
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313 for (ProbeListener listener : probeListeners) { |
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314 listener.probeTaggedAs(this, tag, tagValue); |
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315 } |
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316 if (globalTagTrap != null && tag == globalTagTrap.getTag()) { |
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317 this.trapActive = true; |
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318 } |
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319 probeStateUnchanged.invalidate(); |
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320 } |
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321 } |
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322 |
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323 /** |
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324 * Adds instrumentation at this Probe. |
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325 * |
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326 * @param instrument an instrument not yet attached to a probe |
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327 * @throws IllegalStateException if the instrument has ever been attached before |
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328 */ |
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329 public void attach(Instrument instrument) throws IllegalStateException { |
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330 if (instrument.isDisposed()) { |
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331 throw new IllegalStateException("Attempt to attach disposed instrument"); |
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332 } |
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333 if (instrument.getProbe() != null) { |
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334 throw new IllegalStateException("Attampt to attach an already attached instrument"); |
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335 } |
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336 instrument.setAttachedTo(this); |
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337 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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338 final ProbeNode probeNode = ref.get(); |
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339 if (probeNode != null) { |
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340 probeNode.addInstrument(instrument); |
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341 } |
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342 } |
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343 probeStateUnchanged.invalidate(); |
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344 } |
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345 |
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346 /** |
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347 * Gets the {@link SourceSection} associated with the Guest Language AST node being |
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348 * instrumented, possibly {@code null}. |
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349 */ |
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350 public SourceSection getProbedSourceSection() { |
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351 return sourceSection; |
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352 } |
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353 |
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354 public String getShortDescription() { |
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355 final String location = sourceSection == null ? "<unknown>" : sourceSection.getShortDescription(); |
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356 return "Probe@" + location + getTagsDescription(); |
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357 } |
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358 |
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359 /** |
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360 * Receives notification that a new clone of the instrument chain associated with this |
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361 * {@link Probe} has been created as a side-effect of AST cloning. |
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362 */ |
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363 void registerProbeNodeClone(ProbeNode probeNode) { |
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364 probeNodeClones.add(new WeakReference<>(probeNode)); |
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365 } |
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366 |
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367 /** |
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368 * Gets the currently active {@linkplain SyntaxTagTrap tagTrap}; {@code null} if not set. |
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369 */ |
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370 SyntaxTagTrap getTrap() { |
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371 return trapActive ? globalTagTrap : null; |
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372 } |
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373 |
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374 /** |
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375 * Gets the {@link Assumption} that the instrumentation-related state of this {@link Probe} has |
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376 * not changed since this method was last called. |
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377 */ |
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378 Assumption getUnchangedAssumption() { |
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379 return probeStateUnchanged.getAssumption(); |
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380 } |
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381 |
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382 /** |
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383 * Internal method for removing and rendering inert a specific instrument previously attached at |
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384 * this Probe. |
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385 * |
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386 * @param instrument an instrument already attached |
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387 * @throws IllegalStateException if instrument not attached at this Probe |
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388 * @see Instrument#dispose() |
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389 */ |
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390 void disposeInstrument(Instrument instrument) throws IllegalStateException { |
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391 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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392 final ProbeNode probeNode = ref.get(); |
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393 if (probeNode != null) { |
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394 probeNode.removeInstrument(instrument); |
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395 } |
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396 } |
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397 probeStateUnchanged.invalidate(); |
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398 } |
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399 |
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400 private String getTagsDescription() { |
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401 final StringBuilder sb = new StringBuilder(); |
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402 sb.append("["); |
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403 String prefix = ""; |
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404 for (SyntaxTag tag : tags) { |
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405 sb.append(prefix); |
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406 prefix = ","; |
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407 sb.append(tag.toString()); |
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408 } |
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409 sb.append("]"); |
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410 return sb.toString(); |
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411 } |
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412 } |