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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/NodeExecCounter.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children 1c0f490984d5
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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 com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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28 import com.oracle.truffle.api.frame.VirtualFrame;
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29 import com.oracle.truffle.api.instrument.ASTProber;
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30 import com.oracle.truffle.api.instrument.Instrument;
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31 import com.oracle.truffle.api.instrument.InstrumentationTool;
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32 import com.oracle.truffle.api.instrument.Probe;
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33 import com.oracle.truffle.api.instrument.ProbeException;
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34 import com.oracle.truffle.api.instrument.ProbeFailure;
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35 import com.oracle.truffle.api.instrument.ProbeListener;
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36 import com.oracle.truffle.api.instrument.StandardInstrumentListener;
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37 import com.oracle.truffle.api.instrument.SyntaxTag;
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38 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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39 import com.oracle.truffle.api.instrument.impl.DefaultStandardInstrumentListener;
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40 import com.oracle.truffle.api.nodes.Node;
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41 import com.oracle.truffle.api.nodes.Node.Child;
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42 import com.oracle.truffle.api.nodes.NodeVisitor;
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43 import java.io.PrintStream;
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44 import java.util.ArrayList;
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45 import java.util.Arrays;
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46 import java.util.Collection;
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47 import java.util.Comparator;
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48 import java.util.HashMap;
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49 import java.util.List;
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50 import java.util.Map;
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51 import java.util.concurrent.atomic.AtomicLong;
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52
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53 /**
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54 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes,
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55 * tabulated by the type of called nodes; counting can be enabled <em>all</em> nodes or restricted
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56 * to nodes with a specified {@linkplain SyntaxTag tag} that is presumed to be applied external to
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57 * the tool.
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58 * <p>
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59 * <b>Tool Life Cycle</b>
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60 * <p>
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61 * See {@link InstrumentationTool} for the life cycle common to all such tools.
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62 * </p>
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63 * <b>Execution Counts</b>
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64 * <p>
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65 * <ul>
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66 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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67 * to produce the event {@link StandardInstrumentListener#enter(Probe, Node, VirtualFrame)};</li>
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68 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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69 * {@linkplain Node#isInstrumentable() isInstrumentable() == true};</li>
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70 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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71 * dynamically added nodes will not be instrumented.</li>
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72 * </ul>
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73 * </p>
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74 * <b>Failure Log</b>
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75 * <p>
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76 * For the benefit of language implementors, the tool maintains a log describing failed attempts to
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77 * probe AST nodes. Most failures occur when the type of the wrapper created by
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78 * {@link Node#createWrapperNode()} is not assignable to the relevant {@link Child} field in the
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79 * node's parent.
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80 * </p>
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81 * <p>
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82 * {@linkplain #reset() Resetting} the counts has no effect on the failure log.
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83 * </p>
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84 * <b>Results</b>
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85 * <p>
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86 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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87 * without effect on the state of the tool.
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88 * </p>
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89 * <p>
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90 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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91 * any time in a simple textual format, without effect on the state of the tool.
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92 * </p>
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93 *
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94 * @see Instrument
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95 * @see SyntaxTag
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96 * @see ProbeFailure
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97 */
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98 public final class NodeExecCounter extends InstrumentationTool {
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99
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100 /**
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101 * Execution count for AST nodes of a particular type.
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102 */
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103 public interface NodeExecutionCount {
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104 Class<?> nodeClass();
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105
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106 long executionCount();
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107 }
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108
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109 /**
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110 * Listener for events at instrumented nodes. Counts are maintained in a shared table, so the
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111 * listener is stateless and can be shared by every {@link Instrument}.
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112 */
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113 private final StandardInstrumentListener instrumentListener = new DefaultStandardInstrumentListener() {
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114 @Override
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115 public void enter(Probe probe, Node node, VirtualFrame vFrame) {
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116 if (isEnabled()) {
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117 final Class<?> nodeClass = node.getClass();
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118 /*
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119 * Everything up to here is inlined by Truffle compilation. Delegate the next part
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120 * to a method behind an inlining boundary.
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121 *
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122 * Note that it is not permitted to pass a {@link VirtualFrame} across an inlining
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123 * boundary; they are truly virtual in inlined code.
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124 */
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125 AtomicLong nodeCounter = getCounter(nodeClass);
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126 nodeCounter.getAndIncrement();
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127 }
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128 }
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129
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130 /**
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131 * Mark this method as a boundary that will stop Truffle inlining, which should not be
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132 * allowed to inline the hash table method or any other complex library code.
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133 */
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134 @TruffleBoundary
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135 private AtomicLong getCounter(Class<?> nodeClass) {
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136 AtomicLong nodeCounter = counters.get(nodeClass);
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137 if (nodeCounter == null) {
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138 nodeCounter = new AtomicLong();
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139 counters.put(nodeClass, nodeCounter);
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140 }
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141 return nodeCounter;
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142 }
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143 };
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144
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145 /** Counting data. */
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146 private final Map<Class<?>, AtomicLong> counters = new HashMap<>();
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147
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148 /** Failure log. */
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149 private final List<ProbeFailure> failures = new ArrayList<>();
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150
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151 /** For disposal. */
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152 private final List<Instrument> instruments = new ArrayList<>();
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153
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154 /**
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155 * If non-null, counting is restricted to nodes holding this tag.
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156 */
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157 private final SyntaxTag countingTag;
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158
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159 /**
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160 * Prober used only when instrumenting every node.
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161 */
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162 private ASTProber astProber;
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163
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164 /**
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165 * Listener used only when restricting counting to a specific tag.
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166 */
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167 private ProbeListener probeListener;
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168
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169 /**
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170 * Create a per node-type execution counting tool for all nodes in subsequently created ASTs.
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171 */
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172 public NodeExecCounter() {
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173 this.countingTag = null;
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174 }
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175
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176 /**
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177 * Creates a per-type execution counting for nodes tagged as specified in subsequently created
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178 * ASTs.
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179 */
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180 public NodeExecCounter(SyntaxTag tag) {
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181 this.countingTag = tag;
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182 }
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183
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184 @Override
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185 protected boolean internalInstall() {
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186 if (countingTag == null) {
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187 astProber = new ExecCounterASTProber();
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188 Probe.registerASTProber(astProber);
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189 } else {
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190 probeListener = new NodeExecCounterProbeListener();
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191 Probe.addProbeListener(probeListener);
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192 }
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193 return true;
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194 }
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195
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196 @Override
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197 protected void internalReset() {
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198 counters.clear();
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199 failures.clear();
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200 }
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201
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202 @Override
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203 protected void internalDispose() {
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204 if (astProber != null) {
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205 Probe.unregisterASTProber(astProber);
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206 }
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207 if (probeListener != null) {
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208 Probe.removeProbeListener(probeListener);
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209 }
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210 for (Instrument instrument : instruments) {
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211 instrument.dispose();
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212 }
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213 }
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214
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215 /**
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216 * Gets a modification-safe summary of the current per-type node execution counts; does not
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217 * affect the counts.
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218 */
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219 public NodeExecutionCount[] getCounts() {
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220 final Collection<Map.Entry<Class<?>, AtomicLong>> entrySet = counters.entrySet();
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221 final NodeExecutionCount[] result = new NodeExecCountImpl[entrySet.size()];
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222 int i = 0;
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223 for (Map.Entry<Class<?>, AtomicLong> entry : entrySet) {
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224 result[i++] = new NodeExecCountImpl(entry.getKey(), entry.getValue().longValue());
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225 }
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226 return result;
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227 }
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228
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229 /**
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230 * Gets a log containing a report of every failed attempt to instrument a node.
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231 */
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232 public ProbeFailure[] getFailures() {
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233 return failures.toArray(new ProbeFailure[failures.size()]);
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234 }
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235
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236 /**
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237 * A default printer for the current counts, producing lines of the form
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238 * " <count> : <node type>" in descending order of count.
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239 */
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240 public void print(PrintStream out) {
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241 print(out, false);
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242 }
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243
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244 /**
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245 * A default printer for the current counts, producing lines of the form
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246 * " <count> : <node type>" in descending order of count.
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247 *
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248 * @param out
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249 * @param verbose whether to describe nodes on which instrumentation failed
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250 */
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251 public void print(PrintStream out, boolean verbose) {
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252
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253 final long missedNodes = failures.size();
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254 out.println();
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255 if (countingTag == null) {
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256 out.println("Execution counts by node type:");
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257 } else {
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258 out.println("\"" + countingTag.name() + "\"-tagged execution counts by node type:");
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259 }
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260 final StringBuilder disclaim = new StringBuilder("(");
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261 if (missedNodes > 0) {
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262 disclaim.append(Long.toString(missedNodes) + " original AST nodes not instrumented, ");
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263 }
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264 disclaim.append("dynamically added nodes not instrumented)");
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265 out.println(disclaim.toString());
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266 NodeExecutionCount[] execCounts = getCounts();
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267 // Sort in descending order
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268 Arrays.sort(execCounts, new Comparator<NodeExecutionCount>() {
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269
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270 public int compare(NodeExecutionCount o1, NodeExecutionCount o2) {
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271 return Long.compare(o2.executionCount(), o1.executionCount());
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272 }
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273
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274 });
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275 for (NodeExecutionCount nodeCount : execCounts) {
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276 out.format("%12d", nodeCount.executionCount());
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277 out.println(" : " + nodeCount.nodeClass().getName());
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278 }
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279
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280 if (verbose && missedNodes > 0) {
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281 out.println("Instrumentation failures for execution counts:");
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282
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283 for (ProbeFailure failure : failures) {
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284 out.println("\t" + failure.getMessage());
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285 }
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286 }
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287 }
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288
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289 /**
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290 * A prober that attempts to probe and instrument every node.
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291 */
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292 private class ExecCounterASTProber implements ASTProber, NodeVisitor {
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293
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294 public boolean visit(Node node) {
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295
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296 if (node.isInstrumentable()) {
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297 try {
19818
907128d02b31 Truffle/Instrumentation: For clients of Instrumentation, replace the TruffleEventListener interface with two: InstrumentListener, and ASTInstrumentListener. The former is simple, completely Truffle-safe (can't affect Truffle execution), and designed for simple tools. The latter is similar to the previous interface.
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298 final Instrument instrument = Instrument.create(instrumentListener, "NodeExecCounter");
18987
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299 instruments.add(instrument);
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300 node.probe().attach(instrument);
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301 } catch (ProbeException ex) {
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302 failures.add(ex.getFailure());
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303 }
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304 }
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diff changeset
305 return true;
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306 }
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diff changeset
307
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diff changeset
308 public void probeAST(Node node) {
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diff changeset
309 node.accept(this);
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310 }
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311 }
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diff changeset
312
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diff changeset
313 /**
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diff changeset
314 * A listener that assumes ASTs have been tagged external to this tool, and which instruments
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315 * nodes holding a specified tag.
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316 */
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diff changeset
317 private class NodeExecCounterProbeListener extends DefaultProbeListener {
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318
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diff changeset
319 @Override
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320 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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diff changeset
321 if (countingTag == tag) {
19818
907128d02b31 Truffle/Instrumentation: For clients of Instrumentation, replace the TruffleEventListener interface with two: InstrumentListener, and ASTInstrumentListener. The former is simple, completely Truffle-safe (can't affect Truffle execution), and designed for simple tools. The latter is similar to the previous interface.
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diff changeset
322 final Instrument instrument = Instrument.create(instrumentListener, NodeExecCounter.class.getSimpleName());
18987
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diff changeset
323 instruments.add(instrument);
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diff changeset
324 probe.attach(instrument);
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diff changeset
325 }
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diff changeset
326 }
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327 }
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328
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diff changeset
329 private static class NodeExecCountImpl implements NodeExecutionCount {
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diff changeset
330
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diff changeset
331 private final Class<?> nodeClass;
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diff changeset
332 private final long count;
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diff changeset
333
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diff changeset
334 public NodeExecCountImpl(Class<?> nodeClass, long count) {
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diff changeset
335 this.nodeClass = nodeClass;
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diff changeset
336 this.count = count;
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diff changeset
337 }
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diff changeset
338
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diff changeset
339 public Class<?> nodeClass() {
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340 return nodeClass;
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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341 }
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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342
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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343 public long executionCount() {
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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344 return count;
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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345 }
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
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346 }
ac114ad31cdd Truffle/Tools: a new framework for pluggable tools that gather Truffle execution data
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
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347 }