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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/CoverageTracker.java @ 22231:59e022cee529

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Truffle/Instrumentation: rename InstrumentationTool (abstract parent for CoverageTracker, LineToProbesMap, etc.) to Instrumenter.Tool, eliminating the need for an Accessor instance.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sun, 20 Sep 2015 17:19:59 -0700
parents 3f2052afcb6d
children 959f658b918d
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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.Comparator;
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30 import java.util.HashMap;
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31 import java.util.List;
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32 import java.util.Map;
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33 import java.util.Map.Entry;
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34 import java.util.TreeSet;
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35
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36 import com.oracle.truffle.api.instrument.Instrument;
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37 import com.oracle.truffle.api.instrument.Instrumenter;
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38 import com.oracle.truffle.api.instrument.Probe;
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39 import com.oracle.truffle.api.instrument.ProbeListener;
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40 import com.oracle.truffle.api.instrument.SimpleInstrumentListener;
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41 import com.oracle.truffle.api.instrument.StandardSyntaxTag;
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42 import com.oracle.truffle.api.instrument.SyntaxTag;
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43 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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44 import com.oracle.truffle.api.instrument.impl.DefaultSimpleInstrumentListener;
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45 import com.oracle.truffle.api.nodes.Node;
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46 import com.oracle.truffle.api.source.LineLocation;
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47 import com.oracle.truffle.api.source.Source;
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48 import com.oracle.truffle.api.source.SourceSection;
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49
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50 /**
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51 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes that
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52 * hold a specified {@linkplain SyntaxTag syntax tag}, tabulated by source and line number
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53 * associated with each node. Syntax tags are presumed to be applied external to the tool. If no tag
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54 * is specified, {@linkplain StandardSyntaxTag#STATEMENT STATEMENT} is used, corresponding to
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55 * conventional behavior for code coverage tools.
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56 * <p>
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57 * <b>Tool Life Cycle</b>
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58 * <p>
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59 * See {@link InstrumentationTool} for the life cycle common to all such tools.
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60 * <p>
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61 * <b>Execution Counts</b>
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62 * <p>
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63 * <ul>
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64 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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65 * to produce the event {@link SimpleInstrumentListener#onEnter(Probe)};</li>
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66 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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67 * {@link Instrumenter#isInstrumentable(Node)}{@code == true};</li>
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68 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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69 * dynamically added nodes will not be instrumented.</li>
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70 * </ul>
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71 * </p>
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72 * <b>Results</b>
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73 * <p>
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74 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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75 * without effect on the state of the tool.
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76 * </p>
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77 * <p>
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78 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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79 * any time in a simple textual format, with no other effect on the state of the tool.
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80 * </p>
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81 *
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82 * @see Instrument
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83 * @see SyntaxTag
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84 */
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85 public final class CoverageTracker extends Instrumenter.Tool {
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86
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87 /** Counting data. */
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88 private final Map<LineLocation, CoverageRecord> coverageMap = new HashMap<>();
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89
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90 /** Needed for disposal. */
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91 private final List<Instrument> instruments = new ArrayList<>();
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92
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93 /**
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94 * Coverage counting is restricted to nodes holding this tag.
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95 */
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96 private final SyntaxTag countingTag;
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97
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98 private final ProbeListener probeListener;
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99
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100 /**
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101 * Create a per-line coverage tool for nodes tagged as {@linkplain StandardSyntaxTag#STATEMENT
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102 * statements} in subsequently created ASTs.
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103 */
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104 public CoverageTracker() {
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105 this(StandardSyntaxTag.STATEMENT);
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106 }
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107
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108 /**
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109 * Create a per-line coverage tool for nodes tagged as specified, presuming that tags applied
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110 * outside this tool.
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111 */
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112 public CoverageTracker(SyntaxTag tag) {
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113 this.probeListener = new CoverageProbeListener();
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114 this.countingTag = tag;
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115 }
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116
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117 @Override
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118 protected boolean internalInstall() {
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119 final Instrumenter instrumenter = getInstrumenter();
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120 for (Probe probe : instrumenter.findProbesTaggedAs(countingTag)) {
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121 addCoverageCounter(probe);
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122 }
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123 instrumenter.addProbeListener(probeListener);
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124 return true;
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125 }
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126
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127 @Override
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128 protected void internalReset() {
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129 coverageMap.clear();
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130 }
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131
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132 @Override
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133 protected void internalDispose() {
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134 getInstrumenter().removeProbeListener(probeListener);
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135 for (Instrument instrument : instruments) {
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136 instrument.dispose();
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137 }
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138 }
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139
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140 /**
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141 * Gets a modification-safe summary of the current per-type node execution counts; does not
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142 * affect the counts.
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143 * <p>
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144 * The map holds an array for each source, and elements of the a array corresponding to the
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145 * textual lines of that source. An array entry contains null if the corresponding line of
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146 * source is associated with no nodes of the relevant type, i.e. where no count was made. A
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147 * numeric entry represents the execution count at the corresponding line of source.
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148 * <p>
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149 * <b>Note:</b> source line numbers are 1-based, so array index {@code i} corresponds to source
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150 * line number {@code i + 1}
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151 */
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152 public Map<Source, Long[]> getCounts() {
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153
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154 /**
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155 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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156 * every line associated with an appropriately tagged AST node; iterable in order of source
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157 * name, then line number.
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158 */
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159 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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160
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161 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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162 entries.add(entry);
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163 }
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164 final Map<Source, Long[]> result = new HashMap<>();
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165 Source curSource = null;
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166 Long[] curLineTable = null;
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167 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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168 final LineLocation key = entry.getKey();
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169 final Source source = key.getSource();
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170 final int lineNo = key.getLineNumber();
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171 if (source != curSource) {
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172 if (curSource != null) {
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173 result.put(curSource, curLineTable);
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174 }
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175 curSource = source;
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176 curLineTable = new Long[source.getLineCount()];
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177 }
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178 curLineTable[lineNo - 1] = entry.getValue().count;
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179 }
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180 if (curSource != null) {
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181 result.put(curSource, curLineTable);
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182 }
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183 return result;
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184 }
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185
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186 /**
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187 * A default printer for the current line counts, producing lines of the form " (<count>) <line
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188 * number> : <text of line>", grouped by source.
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189 */
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190 public void print(PrintStream out) {
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191 out.println();
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192 out.println(countingTag.name() + " coverage:");
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193
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194 /**
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195 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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196 * every line associated with an appropriately tagged AST node; iterable in order of source
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197 * name, then line number.
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198 */
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199 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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200
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201 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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202 entries.add(entry);
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203 }
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204 Source curSource = null;
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205 int curLineNo = 1;
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206 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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207 final LineLocation key = entry.getKey();
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208 final Source source = key.getSource();
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209 final int lineNo = key.getLineNumber();
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210 if (source != curSource) {
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211 if (curSource != null) {
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212 while (curLineNo <= curSource.getLineCount()) {
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213 displayLine(out, null, curSource, curLineNo++);
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214 }
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215 }
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216 curSource = source;
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217 curLineNo = 1;
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218 out.println();
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219 out.println(source.getPath());
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220 }
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221 while (curLineNo < lineNo) {
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222 displayLine(out, null, curSource, curLineNo++);
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223 }
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224 displayLine(out, entry.getValue(), curSource, curLineNo++);
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225 }
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226 if (curSource != null) {
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227 while (curLineNo <= curSource.getLineCount()) {
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228 displayLine(out, null, curSource, curLineNo++);
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229 }
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230 }
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231 }
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232
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233 private static void displayLine(PrintStream out, CoverageRecord record, Source source, int lineNo) {
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234 if (record == null) {
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235 out.format("%14s", " ");
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236 } else {
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237 out.format("(%12d)", record.count);
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238 }
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239 out.format(" %3d: ", lineNo);
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240 out.println(source.getCode(lineNo));
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241 }
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242
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243 /**
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244 * A listener for events at each instrumented AST location. This listener counts
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245 * "execution calls" to the instrumented node.
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246 */
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247 private final class CoverageRecord extends DefaultSimpleInstrumentListener {
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248
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249 private final SourceSection srcSection; // The text of the code being counted
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250 private Instrument instrument; // The attached Instrument, in case need to remove.
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251 private long count = 0;
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252
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253 CoverageRecord(SourceSection srcSection) {
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254 this.srcSection = srcSection;
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255 }
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256
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257 @Override
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258 public void onEnter(Probe probe) {
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259 if (isEnabled()) {
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260 count++;
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261 }
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262 }
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263
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264 }
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265
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266 private static final class LineLocationEntryComparator implements Comparator<Entry<LineLocation, CoverageRecord>> {
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267
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diff changeset
268 public int compare(Entry<LineLocation, CoverageRecord> e1, Entry<LineLocation, CoverageRecord> e2) {
21987
b2d1c8ff592a Less classes in the source API package. Merging interfaces and their only implementation into final classes. Hiding NullSourceSection behind factory method. Using JDK's standard CharsetDecoder instead of proprietary BytesDecoder.
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diff changeset
269 return e1.getKey().compareTo(e2.getKey());
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270 }
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271 }
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272
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273 /**
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274 * Attach a counting instrument to each node that is assigned a specified tag.
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275 */
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276 private class CoverageProbeListener extends DefaultProbeListener {
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277
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278 @Override
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279 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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280 if (countingTag == tag) {
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281 addCoverageCounter(probe);
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282 }
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283 }
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284 }
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285
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diff changeset
286 private void addCoverageCounter(Probe probe) {
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diff changeset
287 final SourceSection srcSection = probe.getProbedSourceSection();
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diff changeset
288 if (srcSection == null) {
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289 // TODO (mlvdv) report this?
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diff changeset
290 return;
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diff changeset
291 }
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diff changeset
292 // Get the source line where the
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diff changeset
293 final LineLocation lineLocation = srcSection.getLineLocation();
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diff changeset
294 CoverageRecord record = coverageMap.get(lineLocation);
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diff changeset
295 if (record != null) {
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diff changeset
296 // Another node starts on same line; count only the first (textually)
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diff changeset
297 if (srcSection.getCharIndex() > record.srcSection.getCharIndex()) {
c92d6117696f Truffle/Instrumentation: modify behavior of CoverageTracker and LineToProbesMap so that they will work on ASTs created before installation (as long as correct probes are in place)
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diff changeset
298 // Existing record, corresponds to code earlier on line
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diff changeset
299 return;
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diff changeset
300 } else {
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diff changeset
301 // Existing record, corresponds to code at a later position; replace it
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diff changeset
302 record.instrument.dispose();
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parents: 22220
diff changeset
303 }
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parents: 22220
diff changeset
304 }
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parents: 22220
diff changeset
305
22225
a0fa69e3e60e Truffle/Instrumentation: remove static Instrument factory methods, now supported by Instrumenter
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diff changeset
306 final CoverageRecord coverageRecord = new CoverageRecord(srcSection);
a0fa69e3e60e Truffle/Instrumentation: remove static Instrument factory methods, now supported by Instrumenter
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents: 22221
diff changeset
307 final Instrument instrument = getInstrumenter().attach(probe, coverageRecord, CoverageTracker.class.getSimpleName());
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parents: 22221
diff changeset
308 coverageRecord.instrument = instrument;
22221
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diff changeset
309 instruments.add(instrument);
22225
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diff changeset
310 coverageMap.put(lineLocation, coverageRecord);
22221
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diff changeset
311 }
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diff changeset
312 }