Mercurial > hg > truffle
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/Probe.java @ 18985:867058575979
Truffle: Improved support for "probing" AST nodes:
- Node.isSafelyReplacaeableBy(Node) checks in advance if Node.replace(Node) would be unsafe (crash the VM).
- Hoist Probe() from language imlementations into Node; now completely language agnostic.
- Language implementations support probing by implementing Node.isInstrumentable() and Node.createWrapperNode()
- Node.Probe() throws ProbeException (without side effects) if the probe fails.
-- ProbeException contains an instance of ProbeFailure that diagnoses the failure in detail
- Additional measures to prevent instrumentation from being applied to internal InstrumentationNodes.
- Promote ProbeListener to top level interface and add a default implementation
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Tue, 27 Jan 2015 20:24:54 -0800 |
parents | e3c95cbbb50c |
children | 128586040207 |
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 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.nodes.*; |
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32 import com.oracle.truffle.api.source.*; |
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33 import com.oracle.truffle.api.utilities.*; |
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34 |
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35 //TODO (mlvdv) migrate some of this to external documentation. |
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36 /** |
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37 * A binding between a particular <em>location</em> in the Truffle AST representation of a running |
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38 * Guest Language (GL) program (i.e. a {@link Node}) and a dynamically managed collection of |
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39 * "attached" {@linkplain Instrument instrumentation} for use by external tools. The instrumentation |
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40 * is intended to persist at the location, even if the specific node instance is |
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41 * {@linkplain Node#replace(Node) replaced}. |
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42 * <p> |
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43 * The effect of a binding is to intercept {@linkplain TruffleEventReceiver execution events} |
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44 * arriving at the node and notify each attached {@link Instrument} before execution is allowed to |
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45 * proceed to the child. |
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46 * <p> |
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47 * A Probe is "inserted" into a GL node via a call to {@link Node#probe()}. No more than one Probe |
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48 * can be inserted at a node. |
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49 * <p> |
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50 * The "probing" of a Truffle AST must be done after it is complete (i.e. with parent pointers |
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51 * correctly assigned), but before any executions. This is done by creating an instance of |
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52 * {@link ASTProber} and registering it via {@link #registerASTProber(ASTProber)}, after which it |
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53 * will be automatically applied to newly created ASTs. |
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54 * <p> |
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55 * Each Probe may also have assigned to it any number of {@link SyntaxTag}s, for example identifying |
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56 * a node as a {@linkplain StandardSyntaxTag#STATEMENT STATEMENT}. Tags can be queried by tools to |
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57 * configure behavior relevant to each probed node. |
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58 * <p> |
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59 * Instrumentation is implemented by modifying ASTs, both by inserting nodes into each AST at probed |
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60 * locations and by attaching additional nodes that implement dynamically attached instruments. |
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61 * Attached instrumentation code become, in effect, part of the GL program, and is subject to the |
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62 * same levels of optimization as other GL code. This implementation accounts properly for the fact |
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63 * that Truffle frequently <em>clones</em> ASTs, along with any attached instrumentation nodes. A |
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64 * {@link Probe}, along with attached {@link Instrument}s, represents a <em>logical</em> binding |
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65 * with a source code location, producing event notifications that are (mostly) independent of which |
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66 * AST clone is executing. |
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67 * |
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68 * @see Instrument |
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69 * @see ASTProber |
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70 * @see ProbeListener |
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71 */ |
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72 public final class Probe implements SyntaxTagged { |
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73 |
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74 private static final List<ASTProber> astProbers = new ArrayList<>(); |
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75 |
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76 private static final List<ProbeListener> probeListeners = new ArrayList<>(); |
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77 |
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78 /** |
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79 * All Probes that have been created. |
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80 */ |
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81 private static final List<WeakReference<Probe>> probes = new ArrayList<>(); |
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82 |
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83 private static final class FindSourceVisitor implements NodeVisitor { |
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84 |
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85 Source source = null; |
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86 |
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87 public boolean visit(Node node) { |
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88 final SourceSection sourceSection = node.getSourceSection(); |
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89 if (sourceSection != null) { |
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90 source = sourceSection.getSource(); |
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91 return false; |
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92 } |
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93 return true; |
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94 } |
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95 } |
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96 |
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97 /** |
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98 * Walks an AST, looking for the first node with an assigned {@link SourceSection} and returning |
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99 * the {@link Source}. |
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100 */ |
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101 private static Source findSource(Node node) { |
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102 final FindSourceVisitor visitor = new FindSourceVisitor(); |
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103 node.accept(visitor); |
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104 return visitor.source; |
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105 } |
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106 |
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107 /** |
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108 * The tag trap is a global setting; it only affects {@linkplain Probe probes} with the |
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109 * {@linkplain SyntaxTag tag} specified . |
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110 */ |
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111 private static SyntaxTagTrap globalTagTrap = null; |
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112 |
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113 /** |
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114 * Enables instrumentation at selected nodes in all subsequently constructed ASTs. |
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115 */ |
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116 public static void registerASTProber(ASTProber prober) { |
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117 astProbers.add(prober); |
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118 } |
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119 |
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120 public static void unregisterASTProber(ASTProber prober) { |
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121 astProbers.remove(prober); |
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122 } |
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123 |
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124 /** |
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125 * Enables instrumentation in a newly created AST by applying all registered instances of |
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126 * {@link ASTProber}. |
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127 */ |
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128 public static void applyASTProbers(Node node) { |
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129 |
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130 final Source source = findSource(node); |
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131 |
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132 for (ProbeListener listener : probeListeners) { |
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133 listener.startASTProbing(source); |
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134 } |
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135 for (ASTProber prober : astProbers) { |
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136 prober.probeAST(node); |
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137 } |
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138 for (ProbeListener listener : probeListeners) { |
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139 listener.endASTProbing(source); |
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140 } |
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141 } |
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142 |
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143 /** |
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144 * Adds a {@link ProbeListener} to receive events. |
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145 */ |
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146 public static void addProbeListener(ProbeListener listener) { |
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147 assert listener != null; |
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148 probeListeners.add(listener); |
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149 } |
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150 |
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151 /** |
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152 * Removes a {@link ProbeListener}. Ignored if listener not found. |
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153 */ |
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154 public static void removeProbeListener(ProbeListener listener) { |
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155 probeListeners.remove(listener); |
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156 } |
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157 |
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158 /** |
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159 * Returns all {@link Probe}s holding a particular {@link SyntaxTag}, or the whole collection if |
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160 * the specified tag is {@code null}. |
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161 * |
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162 * @return A collection of probes containing the given tag. |
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163 */ |
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164 public static Collection<Probe> findProbesTaggedAs(SyntaxTag tag) { |
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165 final List<Probe> taggedProbes = new ArrayList<>(); |
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166 for (WeakReference<Probe> ref : probes) { |
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167 Probe probe = ref.get(); |
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168 if (probe != null) { |
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169 if (tag == null || probe.isTaggedAs(tag)) { |
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170 taggedProbes.add(ref.get()); |
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171 } |
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172 } |
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173 } |
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174 return taggedProbes; |
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175 } |
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176 |
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177 /** |
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178 * Sets the current "tag trap". This causes a callback to be triggered whenever execution |
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179 * reaches a {@link Probe} (either existing or subsequently created) with the specified tag. |
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180 * There can only be one tag trap set at a time. |
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181 * |
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182 * @param newTagTrap The {@link SyntaxTagTrap} to set. |
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183 * @throws IllegalStateException if a trap is currently set. |
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184 */ |
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185 public static void setTagTrap(SyntaxTagTrap newTagTrap) throws IllegalStateException { |
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186 assert newTagTrap != null; |
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187 if (globalTagTrap != null) { |
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188 throw new IllegalStateException("trap already set"); |
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189 } |
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190 globalTagTrap = newTagTrap; |
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191 |
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192 final SyntaxTag newTag = newTagTrap.getTag(); |
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193 for (WeakReference<Probe> ref : probes) { |
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194 final Probe probe = ref.get(); |
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195 if (probe != null && probe.tags.contains(newTag)) { |
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196 probe.trapActive = true; |
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197 probe.probeStateUnchanged.invalidate(); |
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198 } |
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199 } |
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200 } |
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201 |
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202 /** |
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203 * Clears the current {@link SyntaxTagTrap}. |
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204 * |
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205 * @throws IllegalStateException if no trap is currently set. |
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206 */ |
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207 public static void clearTagTrap() { |
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208 if (globalTagTrap == null) { |
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209 throw new IllegalStateException("no trap set"); |
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210 } |
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211 globalTagTrap = null; |
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212 |
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213 for (WeakReference<Probe> ref : probes) { |
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214 final Probe probe = ref.get(); |
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215 if (probe != null && probe.trapActive) { |
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216 probe.trapActive = false; |
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217 probe.probeStateUnchanged.invalidate(); |
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218 } |
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219 } |
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220 } |
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221 |
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222 private final SourceSection sourceSection; |
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223 private final ArrayList<SyntaxTag> tags = new ArrayList<>(); |
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224 private final List<WeakReference<ProbeNode>> probeNodeClones = new ArrayList<>(); |
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225 private final CyclicAssumption probeStateUnchanged = new CyclicAssumption("Probe state unchanged"); |
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226 |
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227 /** |
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228 * {@code true} iff the global trap is set and this probe has the matching tag. |
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229 */ |
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230 private boolean trapActive = false; |
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231 |
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232 /** |
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233 * Intended for use only by {@link ProbeNode}. |
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234 */ |
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235 Probe(ProbeNode probeNode, SourceSection sourceSection) { |
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236 this.sourceSection = sourceSection; |
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237 probes.add(new WeakReference<>(this)); |
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238 registerProbeNodeClone(probeNode); |
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239 for (ProbeListener listener : probeListeners) { |
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240 listener.newProbeInserted(this); |
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241 } |
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242 } |
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243 |
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244 public boolean isTaggedAs(SyntaxTag tag) { |
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245 assert tag != null; |
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246 return tags.contains(tag); |
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247 } |
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248 |
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249 public Collection<SyntaxTag> getSyntaxTags() { |
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250 return Collections.unmodifiableCollection(tags); |
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251 } |
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252 |
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253 /** |
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254 * Adds a {@linkplain SyntaxTag tag} to the set of tags associated with this {@link Probe}; |
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255 * {@code no-op} if already in the set. |
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256 */ |
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257 public void tagAs(SyntaxTag tag, Object tagValue) { |
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258 assert tag != null; |
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259 if (!tags.contains(tag)) { |
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260 tags.add(tag); |
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261 for (ProbeListener listener : probeListeners) { |
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262 listener.probeTaggedAs(this, tag, tagValue); |
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263 } |
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264 if (globalTagTrap != null && tag == globalTagTrap.getTag()) { |
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265 this.trapActive = true; |
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266 } |
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267 probeStateUnchanged.invalidate(); |
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268 } |
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269 } |
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270 |
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271 /** |
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272 * Adds instrumentation at this Probe. |
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273 * |
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274 * @param instrument an instrument not yet attached to a probe |
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275 * @throws IllegalStateException if the instrument has ever been attached before |
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276 */ |
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277 public void attach(Instrument instrument) throws IllegalStateException { |
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278 if (instrument.isDisposed()) { |
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279 throw new IllegalStateException("Attempt to attach disposed instrument"); |
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280 } |
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281 if (instrument.getProbe() != null) { |
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282 throw new IllegalStateException("Attampt to attach an already attached instrument"); |
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283 } |
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284 instrument.setAttachedTo(this); |
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285 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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286 final ProbeNode probeNode = ref.get(); |
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287 if (probeNode != null) { |
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288 probeNode.addInstrument(instrument); |
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289 } |
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290 } |
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291 probeStateUnchanged.invalidate(); |
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292 } |
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293 |
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294 /** |
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295 * Gets the {@link SourceSection} associated with the Guest Language AST node being |
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296 * instrumented, possibly {@code null}. |
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297 */ |
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298 public SourceSection getProbedSourceSection() { |
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299 return sourceSection; |
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300 } |
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301 |
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302 public String getShortDescription() { |
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303 final String location = sourceSection == null ? "<unknown>" : sourceSection.getShortDescription(); |
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304 return "Probe@" + location + getTagsDescription(); |
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305 } |
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306 |
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307 /** |
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308 * Receives notification that a new clone of the instrument chain associated with this |
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309 * {@link Probe} has been created as a side-effect of AST cloning. |
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310 */ |
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311 void registerProbeNodeClone(ProbeNode probeNode) { |
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312 probeNodeClones.add(new WeakReference<>(probeNode)); |
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313 } |
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314 |
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315 /** |
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316 * Gets the currently active {@linkplain SyntaxTagTrap tagTrap}; {@code null} if not set. |
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317 */ |
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318 SyntaxTagTrap getTrap() { |
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319 return trapActive ? globalTagTrap : null; |
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320 } |
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321 |
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322 /** |
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323 * Gets the {@link Assumption} that the instrumentation-related state of this {@link Probe} has |
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324 * not changed since this method was last called. |
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325 */ |
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326 Assumption getUnchangedAssumption() { |
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327 return probeStateUnchanged.getAssumption(); |
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328 } |
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329 |
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330 /** |
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331 * Internal method for removing and rendering inert a specific instrument previously attached at |
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332 * this Probe. |
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333 * |
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334 * @param instrument an instrument already attached |
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335 * @throws IllegalStateException if instrument not attached at this Probe |
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336 * @see Instrument#dispose() |
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337 */ |
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338 void disposeInstrument(Instrument instrument) throws IllegalStateException { |
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339 for (WeakReference<ProbeNode> ref : probeNodeClones) { |
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340 final ProbeNode probeNode = ref.get(); |
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341 if (probeNode != null) { |
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342 probeNode.removeInstrument(instrument); |
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343 } |
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344 } |
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345 probeStateUnchanged.invalidate(); |
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346 } |
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347 |
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348 private String getTagsDescription() { |
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349 final StringBuilder sb = new StringBuilder(); |
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350 sb.append("["); |
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351 String prefix = ""; |
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352 for (SyntaxTag tag : tags) { |
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353 sb.append(prefix); |
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354 prefix = ","; |
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355 sb.append(tag.toString()); |
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356 } |
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357 sb.append("]"); |
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358 return sb.toString(); |
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359 } |
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360 } |