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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/NodeExecCounter.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents 0d36601f233e
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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.Instrumenter;
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41 import com.oracle.truffle.api.instrument.Probe;
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42 import com.oracle.truffle.api.instrument.ProbeException;
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43 import com.oracle.truffle.api.instrument.ProbeFailure;
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44 import com.oracle.truffle.api.instrument.ProbeInstrument;
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45 import com.oracle.truffle.api.instrument.ProbeListener;
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46 import com.oracle.truffle.api.instrument.StandardInstrumentListener;
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47 import com.oracle.truffle.api.instrument.SyntaxTag;
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48 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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49 import com.oracle.truffle.api.instrument.impl.DefaultStandardInstrumentListener;
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50 import com.oracle.truffle.api.nodes.Node;
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51 import com.oracle.truffle.api.nodes.Node.Child;
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52 import com.oracle.truffle.api.nodes.NodeVisitor;
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53 import com.oracle.truffle.api.nodes.RootNode;
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54
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55 /**
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56 * An {@linkplain Instrumenter.Tool Instrumentation Tool} that counts interpreter
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57 * <em>execution calls</em> to AST nodes, tabulated by the type of called nodes; counting can be
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58 * enabled <em>all</em> nodes or restricted to nodes with a specified {@linkplain SyntaxTag tag}
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59 * that is presumed to be applied external to the tool.
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60 * <p>
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61 * s <b>Tool Life Cycle</b>
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62 * <p>
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63 * See {@linkplain Instrumenter.Tool Instrumentation Tool} for the life cycle common to all such
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64 * tools.
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65 * </p>
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66 * <b>Execution Counts</b>
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67 * <p>
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68 * <ul>
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69 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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70 * to produce the event {@link StandardInstrumentListener#onEnter(Probe, Node, VirtualFrame)};</li>
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71 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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72 * {@linkplain Instrumenter#probe(Node) probing} is supported;</li>
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73 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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74 * dynamically added nodes will not be instrumented.</li>
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75 * </ul>
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76 * </p>
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77 * <b>Failure Log</b>
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78 * <p>
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79 * For the benefit of language implementors, the tool maintains a log describing failed attempts to
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80 * probe AST nodes. Most failures occur when the type of the wrapper created by
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81 * {@link Node#createWrapperNode()} is not assignable to the relevant {@link Child} field in the
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82 * node's parent.
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83 * </p>
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84 * <p>
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85 * {@linkplain #reset() Resetting} the counts has no effect on the failure log.
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86 * </p>
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87 * <b>Results</b>
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88 * <p>
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89 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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90 * without effect on the state of the tool.
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91 * </p>
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92 * <p>
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93 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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94 * any time in a simple textual format, without effect on the state of the tool.
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95 * </p>
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96 *
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97 * @see ProbeInstrument
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98 * @see SyntaxTag
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99 * @see ProbeFailure
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100 */
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101 public final class NodeExecCounter extends Instrumenter.Tool {
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102
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103 /**
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104 * Execution count for AST nodes of a particular type.
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105 */
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106 public interface NodeExecutionCount {
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107 Class<?> nodeClass();
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108
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109 long executionCount();
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110 }
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111
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112 /**
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113 * Listener for events at instrumented nodes. Counts are maintained in a shared table, so the
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114 * listener is stateless and can be shared by every {@link ProbeInstrument}.
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115 */
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116 private final StandardInstrumentListener instrumentListener = new DefaultStandardInstrumentListener() {
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117 @Override
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118 public void onEnter(Probe probe, Node node, VirtualFrame vFrame) {
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119 if (isEnabled()) {
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120 final Class<?> nodeClass = node.getClass();
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121 /*
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122 * Everything up to here is inlined by Truffle compilation. Delegate the next part
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123 * to a method behind an inlining boundary.
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124 *
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125 * Note that it is not permitted to pass a {@link VirtualFrame} across an inlining
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126 * boundary; they are truly virtual in inlined code.
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127 */
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128 AtomicLong nodeCounter = getCounter(nodeClass);
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129 nodeCounter.getAndIncrement();
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130 }
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131 }
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132
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133 /**
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134 * Mark this method as a boundary that will stop Truffle inlining, which should not be
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135 * allowed to inline the hash table method or any other complex library code.
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136 */
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137 @TruffleBoundary
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138 private AtomicLong getCounter(Class<?> nodeClass) {
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139 AtomicLong nodeCounter = counters.get(nodeClass);
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140 if (nodeCounter == null) {
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141 nodeCounter = new AtomicLong();
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142 counters.put(nodeClass, nodeCounter);
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143 }
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144 return nodeCounter;
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145 }
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146 };
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147
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148 /** Counting data. */
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149 private final Map<Class<?>, AtomicLong> counters = new HashMap<>();
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150
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151 /** Failure log. */
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152 private final List<ProbeFailure> failures = new ArrayList<>();
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153
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154 /** For disposal. */
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155 private final List<ProbeInstrument> instruments = new ArrayList<>();
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156
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157 /**
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158 * If non-null, counting is restricted to nodes holding this tag.
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159 */
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160 private final SyntaxTag countingTag;
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161
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162 /**
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163 * Prober used only when instrumenting every node.
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164 */
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165 private ASTProber astProber;
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166
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167 /**
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168 * Listener used only when restricting counting to a specific tag.
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169 */
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170 private ProbeListener probeListener;
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171
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172 /**
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173 * Create a per node-type execution counting tool for all nodes in subsequently created ASTs.
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174 */
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175 public NodeExecCounter() {
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176 this(null);
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177 }
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178
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179 /**
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180 * Creates a per-type execution counting for nodes tagged as specified in subsequently created
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181 * ASTs.
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182 */
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183 public NodeExecCounter(SyntaxTag tag) {
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184 this.countingTag = tag;
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185 }
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186
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187 @Override
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188 protected boolean internalInstall() {
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189 if (countingTag == null) {
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190 astProber = new ExecCounterASTProber();
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191 getInstrumenter().registerASTProber(astProber);
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192 } else {
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193 probeListener = new NodeExecCounterProbeListener();
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194 getInstrumenter().addProbeListener(probeListener);
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195 }
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196 return true;
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197 }
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198
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199 @Override
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200 protected void internalReset() {
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201 counters.clear();
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202 failures.clear();
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203 }
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204
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205 @Override
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206 protected void internalDispose() {
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207 if (astProber != null) {
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208 getInstrumenter().unregisterASTProber(astProber);
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209 }
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210 if (probeListener != null) {
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211 getInstrumenter().removeProbeListener(probeListener);
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212 }
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213 for (ProbeInstrument instrument : instruments) {
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214 instrument.dispose();
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215 }
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216 }
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217
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218 /**
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219 * Gets a modification-safe summary of the current per-type node execution counts; does not
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220 * affect the counts.
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221 */
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222 public NodeExecutionCount[] getCounts() {
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223 final Collection<Map.Entry<Class<?>, AtomicLong>> entrySet = counters.entrySet();
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224 final NodeExecutionCount[] result = new NodeExecCountImpl[entrySet.size()];
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225 int i = 0;
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226 for (Map.Entry<Class<?>, AtomicLong> entry : entrySet) {
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227 result[i++] = new NodeExecCountImpl(entry.getKey(), entry.getValue().longValue());
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228 }
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229 return result;
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230 }
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231
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232 /**
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233 * Gets a log containing a report of every failed attempt to instrument a node.
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234 */
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235 public ProbeFailure[] getFailures() {
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236 return failures.toArray(new ProbeFailure[failures.size()]);
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237 }
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238
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239 /**
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240 * A default printer for the current counts, producing lines of the form
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241 * " <count> : <node type>" in descending order of count.
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242 */
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243 public void print(PrintStream out) {
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244 print(out, false);
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245 }
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246
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247 /**
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248 * A default printer for the current counts, producing lines of the form
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249 * " <count> : <node type>" in descending order of count.
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250 *
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251 * @param out
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252 * @param verbose whether to describe nodes on which instrumentation failed
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253 */
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254 public void print(PrintStream out, boolean verbose) {
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255
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256 final long missedNodes = failures.size();
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257 out.println();
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258 if (countingTag == null) {
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259 out.println("Execution counts by node type:");
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260 } else {
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261 out.println("\"" + countingTag.name() + "\"-tagged execution counts by node type:");
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262 }
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263 final StringBuilder disclaim = new StringBuilder("(");
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264 if (missedNodes > 0) {
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265 disclaim.append(Long.toString(missedNodes) + " original AST nodes not instrumented, ");
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266 }
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267 disclaim.append("dynamically added nodes not instrumented)");
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268 out.println(disclaim.toString());
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269 NodeExecutionCount[] execCounts = getCounts();
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270 // Sort in descending order
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271 Arrays.sort(execCounts, new Comparator<NodeExecutionCount>() {
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272
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273 public int compare(NodeExecutionCount o1, NodeExecutionCount o2) {
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274 return Long.compare(o2.executionCount(), o1.executionCount());
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275 }
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276
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277 });
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278 for (NodeExecutionCount nodeCount : execCounts) {
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279 out.format("%12d", nodeCount.executionCount());
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280 out.println(" : " + nodeCount.nodeClass().getName());
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281 }
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282
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283 if (verbose && missedNodes > 0) {
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284 out.println("Instrumentation failures for execution counts:");
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285
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286 for (ProbeFailure failure : failures) {
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287 out.println("\t" + failure.getMessage());
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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 /**
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293 * A prober that attempts to probe and instrument every node.
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294 */
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295 private class ExecCounterASTProber implements ASTProber {
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296
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297 public void probeAST(final Instrumenter instrumenter, final RootNode startNode) {
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298
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diff changeset
299 startNode.accept(new NodeVisitor() {
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300
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diff changeset
301 public boolean visit(Node node) {
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diff changeset
302 try {
22225
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303
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304 final Probe probe = instrumenter.probe(node);
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diff changeset
305 final ProbeInstrument instrument = instrumenter.attach(probe, instrumentListener, "NodeExecCounter");
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diff changeset
306 instruments.add(instrument);
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diff changeset
307 } catch (ProbeException ex) {
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diff changeset
308 failures.add(ex.getFailure());
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diff changeset
309 }
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diff changeset
310 return true;
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311 }
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312
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diff changeset
313 });
18987
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314 }
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315 }
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316
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diff changeset
317 /**
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diff changeset
318 * A listener that assumes ASTs have been tagged external to this tool, and which instruments
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319 * nodes holding a specified tag.
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320 */
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diff changeset
321 private class NodeExecCounterProbeListener extends DefaultProbeListener {
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322
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323 @Override
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diff changeset
324 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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diff changeset
325 if (countingTag == tag) {
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diff changeset
326 final ProbeInstrument instrument = getInstrumenter().attach(probe, instrumentListener, NodeExecCounter.class.getSimpleName());
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diff changeset
327 instruments.add(instrument);
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328 }
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329 }
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330 }
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331
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diff changeset
332 private static class NodeExecCountImpl implements NodeExecutionCount {
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diff changeset
333
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diff changeset
334 private final Class<?> nodeClass;
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diff changeset
335 private final long count;
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336
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337 public NodeExecCountImpl(Class<?> nodeClass, long count) {
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338 this.nodeClass = nodeClass;
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339 this.count = count;
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340 }
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341
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342 public Class<?> nodeClass() {
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343 return nodeClass;
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344 }
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345
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346 public long executionCount() {
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347 return count;
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348 }
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349 }
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350 }