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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/tools/NodeExecCounter.java @ 19186:3d2296dbace9

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Truffle/Instrumentation: TruffleTool renamed to InstrumentationTool (the base class for a group of tools that collect information during program execution)
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sun, 08 Feb 2015 20:05:40 -0800
parents c7e57dffc5ad
children c5b20395a8bf
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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.api.tools;
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26
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27 import java.io.*;
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28 import java.util.*;
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29 import java.util.concurrent.atomic.*;
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30
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31 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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32 import com.oracle.truffle.api.frame.*;
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33 import com.oracle.truffle.api.instrument.*;
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34 import com.oracle.truffle.api.instrument.impl.*;
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35 import com.oracle.truffle.api.nodes.*;
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36 import com.oracle.truffle.api.nodes.Node.Child;
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37
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38 /**
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39 * A {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes, tabulated by
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40 * the type of called nodes; counting can be enabled <em>all</em> nodes or restricted to nodes with
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41 * a specified {@linkplain SyntaxTag tag} that is presumed to be applied external to the tool.
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42 * <p>
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43 * <b>Tool Life Cycle</b>
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44 * <p>
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45 * See {@link InstrumentationTool} for the life cycle common to all such tools.
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46 * </p>
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47 * <b>Execution Counts</b>
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48 * <p>
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49 * <ul>
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50 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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51 * to produce the event {@link TruffleEventReceiver#enter(Node, VirtualFrame)};</li>
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52 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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53 * {@linkplain Node#isInstrumentable() isInstrumentable() == true};</li>
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54 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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55 * dynamically added nodes will not be instrumented.</li>
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56 * </ul>
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57 * </p>
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58 * <b>Failure Log</b>
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59 * <p>
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60 * For the benefit of language implementors, the tool maintains a log describing failed attempts to
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61 * probe AST nodes. Most failures occur when the type of the wrapper created by
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62 * {@link Node#createWrapperNode()} is not assignable to the relevant {@link Child} field in the
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63 * node's parent.
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64 * </p>
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65 * <p>
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66 * {@linkplain #reset() Resetting} the counts has no effect on the failure log.
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67 * </p>
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68 * <b>Results</b>
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69 * <p>
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70 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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71 * without effect on the state of the tool.
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72 * </p>
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73 * <p>
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74 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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75 * any time in a simple textual format, without effect on the state of the tool.
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76 * </p>
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77 *
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78 * @see Instrument
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79 * @see SyntaxTag
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80 * @see ProbeFailure
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81 */
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82 public final class NodeExecCounter extends InstrumentationTool {
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83
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84 /**
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85 * Execution count for AST nodes of a particular type.
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86 */
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87 public interface NodeExecutionCount {
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88 Class<?> nodeClass();
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89
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90 long executionCount();
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91 }
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92
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93 /**
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94 * Receiver for events at instrumented nodes. Counts are maintained in a shared table, so the
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95 * receiver is stateless and can be shared by every {@link Instrument}.
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96 */
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97 private final TruffleEventReceiver eventReceiver = new DefaultEventReceiver() {
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98 @Override
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99 public void enter(Node node, VirtualFrame frame) {
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100 internalReceive(node);
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101 }
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102
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103 @TruffleBoundary
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104 private void internalReceive(Node node) {
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105 if (isEnabled()) {
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106 final Class<?> nodeClass = node.getClass();
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107 AtomicLong nodeCounter = counters.get(nodeClass);
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108 if (nodeCounter == null) {
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109 nodeCounter = new AtomicLong();
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110 counters.put(nodeClass, nodeCounter);
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111 }
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112 nodeCounter.getAndIncrement();
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113 }
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114 }
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115 };
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116
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117 /** Counting data. */
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118 private final Map<Class<?>, AtomicLong> counters = new HashMap<>();
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119
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120 /** Failure log. */
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121 private final List<ProbeFailure> failures = new ArrayList<>();
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122
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123 /** For disposal. */
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124 private final List<Instrument> instruments = new ArrayList<>();
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125
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126 /**
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127 * If non-null, counting is restricted to nodes holding this tag.
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128 */
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129 private final SyntaxTag countingTag;
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130
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131 /**
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132 * Prober used only when instrumenting every node.
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133 */
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134 private ASTProber astProber;
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135
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136 /**
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137 * Listener used only when restricting counting to a specific tag.
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138 */
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139 private ProbeListener probeListener;
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140
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141 /**
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142 * Create a per node-type execution counting tool for all nodes in subsequently created ASTs.
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143 */
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144 public NodeExecCounter() {
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145 this.countingTag = null;
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146 }
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147
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148 /**
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149 * Creates a per-type execution counting for nodes tagged as specified in subsequently created
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150 * ASTs.
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151 */
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152 public NodeExecCounter(SyntaxTag tag) {
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153 this.countingTag = tag;
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154 }
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155
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156 @Override
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157 protected boolean internalInstall() {
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158 if (countingTag == null) {
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159 astProber = new ExecCounterASTProber();
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160 Probe.registerASTProber(astProber);
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161 } else {
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162 probeListener = new NodeExecCounterProbeListener();
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163 Probe.addProbeListener(probeListener);
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164 }
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165 return true;
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166 }
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167
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168 @Override
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169 protected void internalReset() {
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170 counters.clear();
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171 failures.clear();
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172 }
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173
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174 @Override
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175 protected void internalDispose() {
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176 if (astProber != null) {
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177 Probe.unregisterASTProber(astProber);
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178 }
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179 if (probeListener != null) {
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180 Probe.removeProbeListener(probeListener);
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181 }
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182 for (Instrument instrument : instruments) {
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183 instrument.dispose();
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184 }
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185 }
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186
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187 /**
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188 * Gets a modification-safe summary of the current per-type node execution counts; does not
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189 * affect the counts.
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190 */
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191 public NodeExecutionCount[] getCounts() {
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192 final Collection<Map.Entry<Class<?>, AtomicLong>> entrySet = counters.entrySet();
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193 final NodeExecutionCount[] result = new NodeExecCountImpl[entrySet.size()];
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194 int i = 0;
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195 for (Map.Entry<Class<?>, AtomicLong> entry : entrySet) {
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196 result[i++] = new NodeExecCountImpl(entry.getKey(), entry.getValue().longValue());
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197 }
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198 return result;
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199 }
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200
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201 /**
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202 * Gets a log containing a report of every failed attempt to instrument a node.
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203 */
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204 public ProbeFailure[] getFailures() {
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205 return failures.toArray(new ProbeFailure[failures.size()]);
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206 }
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207
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208 /**
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209 * A default printer for the current counts, producing lines of the form
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210 * " <count> : <node type>" in descending order of count.
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211 */
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212 public void print(PrintStream out) {
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213 print(out, false);
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214 }
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215
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216 /**
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217 * A default printer for the current counts, producing lines of the form
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218 * " <count> : <node type>" in descending order of count.
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219 *
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220 * @param out
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221 * @param verbose whether to describe nodes on which instrumentation failed
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222 */
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223 public void print(PrintStream out, boolean verbose) {
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224
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225 final long missedNodes = failures.size();
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226 out.println();
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227 if (countingTag == null) {
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228 out.println("Execution counts by node type:");
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229 } else {
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230 out.println("\"" + countingTag.name() + "\"-tagged execution counts by node type:");
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231 }
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232 final StringBuilder disclaim = new StringBuilder("(");
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233 if (missedNodes > 0) {
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234 disclaim.append(Long.toString(missedNodes) + " original AST nodes not instrumented, ");
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235 }
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236 disclaim.append("dynamically added nodes not instrumented)");
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237 out.println(disclaim.toString());
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238 NodeExecutionCount[] execCounts = getCounts();
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239 // Sort in descending order
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240 Arrays.sort(execCounts, new Comparator<NodeExecutionCount>() {
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241
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242 public int compare(NodeExecutionCount o1, NodeExecutionCount o2) {
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243 return Long.compare(o2.executionCount(), o1.executionCount());
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244 }
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245
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246 });
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247 for (NodeExecutionCount nodeCount : execCounts) {
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248 out.format("%12d", nodeCount.executionCount());
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249 out.println(" : " + nodeCount.nodeClass().getName());
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250 }
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251
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252 if (verbose && missedNodes > 0) {
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253 out.println("Instrumentation failures for execution counts:");
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254
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255 for (ProbeFailure failure : failures) {
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256 out.println("\t" + failure.getMessage());
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257 }
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258 }
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259 }
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260
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261 /**
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262 * A prober that attempts to probe and instrument every node.
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263 */
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264 private class ExecCounterASTProber implements ASTProber, NodeVisitor {
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265
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266 public boolean visit(Node node) {
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267
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268 if (node.isInstrumentable()) {
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269 try {
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270 final Instrument instrument = Instrument.create(eventReceiver, "NodeExecCounter");
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271 instruments.add(instrument);
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272 node.probe().attach(instrument);
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273 } catch (ProbeException ex) {
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274 failures.add(ex.getFailure());
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275 }
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276 }
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277 return true;
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278 }
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279
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280 public void probeAST(Node node) {
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281 node.accept(this);
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282 }
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283 }
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284
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285 /**
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286 * A listener that assumes ASTs have been tagged external to this tool, and which instruments
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287 * nodes holding a specified tag.
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288 */
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289 private class NodeExecCounterProbeListener extends DefaultProbeListener {
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290
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291 @Override
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292 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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293 if (countingTag == tag) {
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294 final Instrument instrument = Instrument.create(eventReceiver, NodeExecCounter.class.getSimpleName());
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295 instruments.add(instrument);
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296 probe.attach(instrument);
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297 }
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298 }
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299 }
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300
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301 private static class NodeExecCountImpl implements NodeExecutionCount {
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302
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303 private final Class<?> nodeClass;
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304 private final long count;
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305
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306 public NodeExecCountImpl(Class<?> nodeClass, long count) {
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307 this.nodeClass = nodeClass;
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308 this.count = count;
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309 }
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310
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311 public Class<?> nodeClass() {
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312 return nodeClass;
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313 }
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314
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315 public long executionCount() {
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316 return count;
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317 }
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318 }
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319 }