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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/NodeExecCounter.java @ 22219:1c0f490984d5

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Merge with f47b601edbc626dcfe8b3636933b4834c89f7779
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Wed, 16 Sep 2015 15:36:22 -0700
parents dc83cc1f94f2 3aad794eec0e
children 20380d1d41f2
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1 /*
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2 * Copyright (c) 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.tools;
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26
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27 import java.io.PrintStream;
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28 import java.util.ArrayList;
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29 import java.util.Arrays;
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30 import java.util.Collection;
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31 import java.util.Comparator;
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32 import java.util.HashMap;
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33 import java.util.List;
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34 import java.util.Map;
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35 import java.util.concurrent.atomic.AtomicLong;
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36
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37 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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38 import com.oracle.truffle.api.frame.VirtualFrame;
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39 import com.oracle.truffle.api.instrument.ASTProber;
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40 import com.oracle.truffle.api.instrument.Instrument;
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41 import com.oracle.truffle.api.instrument.InstrumentationTool;
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42 import com.oracle.truffle.api.instrument.Instrumenter;
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43 import com.oracle.truffle.api.instrument.Probe;
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44 import com.oracle.truffle.api.instrument.ProbeException;
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45 import com.oracle.truffle.api.instrument.ProbeFailure;
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46 import com.oracle.truffle.api.instrument.ProbeListener;
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47 import com.oracle.truffle.api.instrument.StandardInstrumentListener;
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48 import com.oracle.truffle.api.instrument.SyntaxTag;
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49 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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50 import com.oracle.truffle.api.instrument.impl.DefaultStandardInstrumentListener;
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51 import com.oracle.truffle.api.nodes.Node;
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52 import com.oracle.truffle.api.nodes.Node.Child;
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53 import com.oracle.truffle.api.nodes.NodeVisitor;
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54
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55 /**
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56 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes,
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57 * tabulated by the type of called nodes; counting can be enabled <em>all</em> nodes or restricted
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58 * to nodes with a specified {@linkplain SyntaxTag tag} that is presumed to be applied external to
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59 * the tool.
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60 * <p>
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61 * <b>Tool Life Cycle</b>
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62 * <p>
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63 * See {@link InstrumentationTool} for the life cycle common to all such tools.
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64 * </p>
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65 * <b>Execution Counts</b>
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66 * <p>
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67 * <ul>
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68 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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69 * to produce the event {@link StandardInstrumentListener#enter(Probe, Node, VirtualFrame)};</li>
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70 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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71 * {@linkplain Node#isInstrumentable() isInstrumentable() == true};</li>
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72 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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73 * dynamically added nodes will not be instrumented.</li>
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74 * </ul>
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75 * </p>
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76 * <b>Failure Log</b>
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77 * <p>
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78 * For the benefit of language implementors, the tool maintains a log describing failed attempts to
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79 * probe AST nodes. Most failures occur when the type of the wrapper created by
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80 * {@link Node#createWrapperNode()} is not assignable to the relevant {@link Child} field in the
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81 * node's parent.
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82 * </p>
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83 * <p>
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84 * {@linkplain #reset() Resetting} the counts has no effect on the failure log.
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85 * </p>
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86 * <b>Results</b>
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87 * <p>
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88 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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89 * without effect on the state of the tool.
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90 * </p>
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91 * <p>
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92 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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93 * any time in a simple textual format, without effect on the state of the tool.
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94 * </p>
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95 *
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96 * @see Instrument
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97 * @see SyntaxTag
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98 * @see ProbeFailure
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99 */
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100 public final class NodeExecCounter extends InstrumentationTool {
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101
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102 /**
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103 * Execution count for AST nodes of a particular type.
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104 */
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105 public interface NodeExecutionCount {
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106 Class<?> nodeClass();
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107
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108 long executionCount();
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109 }
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110
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111 /**
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112 * Listener for events at instrumented nodes. Counts are maintained in a shared table, so the
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113 * listener is stateless and can be shared by every {@link Instrument}.
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114 */
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115 private final StandardInstrumentListener instrumentListener = new DefaultStandardInstrumentListener() {
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116 @Override
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117 public void enter(Probe probe, Node node, VirtualFrame vFrame) {
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118 if (isEnabled()) {
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119 final Class<?> nodeClass = node.getClass();
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120 /*
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121 * Everything up to here is inlined by Truffle compilation. Delegate the next part
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122 * to a method behind an inlining boundary.
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123 *
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124 * Note that it is not permitted to pass a {@link VirtualFrame} across an inlining
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125 * boundary; they are truly virtual in inlined code.
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126 */
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127 AtomicLong nodeCounter = getCounter(nodeClass);
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128 nodeCounter.getAndIncrement();
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129 }
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130 }
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131
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132 /**
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133 * Mark this method as a boundary that will stop Truffle inlining, which should not be
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134 * allowed to inline the hash table method or any other complex library code.
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135 */
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136 @TruffleBoundary
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137 private AtomicLong getCounter(Class<?> nodeClass) {
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138 AtomicLong nodeCounter = counters.get(nodeClass);
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139 if (nodeCounter == null) {
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140 nodeCounter = new AtomicLong();
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141 counters.put(nodeClass, nodeCounter);
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142 }
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143 return nodeCounter;
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144 }
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145 };
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146
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147 /** Counting data. */
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148 private final Map<Class<?>, AtomicLong> counters = new HashMap<>();
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149
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150 /** Failure log. */
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151 private final List<ProbeFailure> failures = new ArrayList<>();
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152
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153 /** For disposal. */
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154 private final List<Instrument> instruments = new ArrayList<>();
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155
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156 /**
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157 * If non-null, counting is restricted to nodes holding this tag.
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158 */
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159 private final SyntaxTag countingTag;
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160
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161 /**
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162 * Prober used only when instrumenting every node.
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163 */
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164 private ASTProber astProber;
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165
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166 /**
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167 * Listener used only when restricting counting to a specific tag.
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168 */
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169 private ProbeListener probeListener;
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170
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171 /**
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172 * Create a per node-type execution counting tool for all nodes in subsequently created ASTs.
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173 */
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174 public NodeExecCounter() {
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175 this(null);
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176 }
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177
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178 /**
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179 * Creates a per-type execution counting for nodes tagged as specified in subsequently created
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180 * ASTs.
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181 */
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182 public NodeExecCounter(SyntaxTag tag) {
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183 this.countingTag = tag;
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184 }
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185
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186 @Override
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187 protected boolean internalInstall() {
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188 if (countingTag == null) {
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189 astProber = new ExecCounterASTProber();
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190 getInstrumenter().registerASTProber(astProber);
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191 } else {
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192 probeListener = new NodeExecCounterProbeListener();
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193 getInstrumenter().addProbeListener(probeListener);
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194 }
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195 return true;
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196 }
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197
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198 @Override
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199 protected void internalReset() {
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200 counters.clear();
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201 failures.clear();
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202 }
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203
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204 @Override
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205 protected void internalDispose() {
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206 if (astProber != null) {
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207 getInstrumenter().unregisterASTProber(astProber);
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208 }
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209 if (probeListener != null) {
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210 getInstrumenter().removeProbeListener(probeListener);
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211 }
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212 for (Instrument instrument : instruments) {
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213 instrument.dispose();
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214 }
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215 }
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216
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217 /**
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218 * Gets a modification-safe summary of the current per-type node execution counts; does not
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219 * affect the counts.
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220 */
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221 public NodeExecutionCount[] getCounts() {
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222 final Collection<Map.Entry<Class<?>, AtomicLong>> entrySet = counters.entrySet();
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223 final NodeExecutionCount[] result = new NodeExecCountImpl[entrySet.size()];
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224 int i = 0;
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225 for (Map.Entry<Class<?>, AtomicLong> entry : entrySet) {
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226 result[i++] = new NodeExecCountImpl(entry.getKey(), entry.getValue().longValue());
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227 }
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228 return result;
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229 }
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230
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231 /**
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232 * Gets a log containing a report of every failed attempt to instrument a node.
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233 */
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234 public ProbeFailure[] getFailures() {
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235 return failures.toArray(new ProbeFailure[failures.size()]);
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236 }
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237
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238 /**
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239 * A default printer for the current counts, producing lines of the form
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240 * " <count> : <node type>" in descending order of count.
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241 */
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242 public void print(PrintStream out) {
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243 print(out, false);
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244 }
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245
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246 /**
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247 * A default printer for the current counts, producing lines of the form
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248 * " <count> : <node type>" in descending order of count.
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249 *
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250 * @param out
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251 * @param verbose whether to describe nodes on which instrumentation failed
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252 */
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253 public void print(PrintStream out, boolean verbose) {
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254
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255 final long missedNodes = failures.size();
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256 out.println();
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257 if (countingTag == null) {
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258 out.println("Execution counts by node type:");
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259 } else {
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260 out.println("\"" + countingTag.name() + "\"-tagged execution counts by node type:");
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261 }
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262 final StringBuilder disclaim = new StringBuilder("(");
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263 if (missedNodes > 0) {
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264 disclaim.append(Long.toString(missedNodes) + " original AST nodes not instrumented, ");
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265 }
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266 disclaim.append("dynamically added nodes not instrumented)");
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267 out.println(disclaim.toString());
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268 NodeExecutionCount[] execCounts = getCounts();
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269 // Sort in descending order
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270 Arrays.sort(execCounts, new Comparator<NodeExecutionCount>() {
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271
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272 public int compare(NodeExecutionCount o1, NodeExecutionCount o2) {
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273 return Long.compare(o2.executionCount(), o1.executionCount());
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274 }
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275
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276 });
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277 for (NodeExecutionCount nodeCount : execCounts) {
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278 out.format("%12d", nodeCount.executionCount());
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279 out.println(" : " + nodeCount.nodeClass().getName());
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280 }
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281
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282 if (verbose && missedNodes > 0) {
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283 out.println("Instrumentation failures for execution counts:");
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284
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285 for (ProbeFailure failure : failures) {
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286 out.println("\t" + failure.getMessage());
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287 }
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288 }
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289 }
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290
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291 /**
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292 * A prober that attempts to probe and instrument every node.
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293 */
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294 private class ExecCounterASTProber implements ASTProber {
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295
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296 public void probeAST(final Instrumenter instrumenter, final Node startNode) {
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297
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298 startNode.accept(new NodeVisitor() {
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299
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300 public boolean visit(Node node) {
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301
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302 if (node.isInstrumentable()) {
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303 try {
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304 final Instrument instrument = Instrument.create(instrumentListener, "NodeExecCounter");
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305 instruments.add(instrument);
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306 instrumenter.probe(node).attach(instrument);
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307 } catch (ProbeException ex) {
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308 failures.add(ex.getFailure());
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309 }
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310 }
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311 return true;
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312 }
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313
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314 });
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315 }
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316 }
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317
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318 /**
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319 * A listener that assumes ASTs have been tagged external to this tool, and which instruments
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320 * nodes holding a specified tag.
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321 */
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322 private class NodeExecCounterProbeListener extends DefaultProbeListener {
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323
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324 @Override
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325 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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326 if (countingTag == tag) {
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327 final Instrument instrument = Instrument.create(instrumentListener, NodeExecCounter.class.getSimpleName());
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328 instruments.add(instrument);
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329 probe.attach(instrument);
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330 }
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331 }
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332 }
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333
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334 private static class NodeExecCountImpl implements NodeExecutionCount {
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336 private final Class<?> nodeClass;
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337 private final long count;
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338
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339 public NodeExecCountImpl(Class<?> nodeClass, long count) {
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340 this.nodeClass = nodeClass;
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341 this.count = count;
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342 }
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343
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344 public Class<?> nodeClass() {
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345 return nodeClass;
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346 }
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347
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348 public long executionCount() {
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349 return count;
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350 }
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351 }
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352 }