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annotate graal/com.oracle.truffle.tools/src/com/oracle/truffle/tools/CoverageTracker.java @ 21568:3b8bbf51d320

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Truffle/Debugging: add the Truffle DebugEngine and supporting code, as well as add a crude command-line debugging tool used mainly to test the DebugEngine. Migrate the small tols out of project com.oracle.truffle.api into the new project com.oracle.truffle.tools.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Tue, 26 May 2015 16:38:13 -0700
parents graal/com.oracle.truffle.api/src/com/oracle/truffle/api/tools/CoverageTracker.java@06b0a2fb20a1
children
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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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27 import java.io.*;
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28 import java.util.*;
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29 import java.util.Map.Entry;
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30
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31 import com.oracle.truffle.api.instrument.*;
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32 import com.oracle.truffle.api.instrument.impl.*;
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33 import com.oracle.truffle.api.nodes.*;
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34 import com.oracle.truffle.api.source.*;
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35
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36 /**
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37 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes that
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38 * hold a specified {@linkplain SyntaxTag syntax tag}, tabulated by source and line number
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39 * associated with each node. Syntax tags are presumed to be applied external to the tool. If no tag
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40 * is specified, {@linkplain StandardSyntaxTag#STATEMENT STATEMENT} is used, corresponding to
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41 * conventional behavior for code coverage tools.
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42 * <p>
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43 * No counts will be kept for execution in sources that hold the {@link SourceTag}
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44 * {@link Tags#NO_COVERAGE}.
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45 * <p>
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46 * <b>Tool Life Cycle</b>
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47 * <p>
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48 * See {@link InstrumentationTool} for the life cycle common to all such tools.
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49 * <p>
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50 * <b>Execution Counts</b>
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51 * <p>
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52 * <ul>
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53 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented
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54 * to produce the event {@link SimpleInstrumentListener#enter(Probe)};</li>
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55 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which
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56 * {@linkplain Node#isInstrumentable() isInstrumentable() == true};</li>
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57 * <li>Execution calls are tabulated only at nodes present in the AST when originally created;
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58 * dynamically added nodes will not be instrumented.</li>
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59 * </ul>
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60 * </p>
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61 * <b>Results</b>
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62 * <p>
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63 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time,
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64 * without effect on the state of the tool.
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65 * </p>
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66 * <p>
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67 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at
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68 * any time in a simple textual format, with no other effect on the state of the tool.
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69 * </p>
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70 *
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71 * @see Instrument
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72 * @see SyntaxTag
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73 */
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74 public final class CoverageTracker extends InstrumentationTool {
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75
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76 public enum Tags implements SourceTag {
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77
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78 /**
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79 * Report no counts for sources holding this tag.
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80 */
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81 NO_COVERAGE("No Coverage", "Coverage Tracker will igore");
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82
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83 private final String name;
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84 private final String description;
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85
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86 private Tags(String name, String description) {
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87 this.name = name;
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88 this.description = description;
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89 }
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90
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91 public String getName() {
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92 return name;
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93 }
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94
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95 public String getDescription() {
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96 return description;
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97 }
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98 }
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99
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100 /** Counting data. */
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101 private final Map<LineLocation, CoverageRecord> coverageMap = new HashMap<>();
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102
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103 /** Needed for disposal. */
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104 private final List<Instrument> instruments = new ArrayList<>();
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105
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106 /**
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107 * Coverage counting is restricted to nodes holding this tag.
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108 */
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109 private final SyntaxTag countingTag;
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110
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111 private final ProbeListener probeListener;
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112
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113 /**
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114 * Create a per-line coverage tool for nodes tagged as {@linkplain StandardSyntaxTag#STATEMENT
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115 * statements} in subsequently created ASTs.
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116 */
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117 public CoverageTracker() {
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118 this(StandardSyntaxTag.STATEMENT);
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119 }
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120
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121 /**
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122 * Create a per-line coverage tool for nodes tagged as specified, presuming that tags applied
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123 * outside this tool.
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124 */
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125 public CoverageTracker(SyntaxTag tag) {
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126 this.probeListener = new CoverageProbeListener();
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127 this.countingTag = tag;
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128 }
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129
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130 @Override
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131 protected boolean internalInstall() {
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132 Probe.addProbeListener(probeListener);
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133 return true;
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134 }
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135
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136 @Override
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137 protected void internalReset() {
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138 coverageMap.clear();
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139 }
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140
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141 @Override
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142 protected void internalDispose() {
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143 Probe.removeProbeListener(probeListener);
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144 for (Instrument instrument : instruments) {
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145 instrument.dispose();
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146 }
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147 }
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148
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149 /**
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150 * Gets a modification-safe summary of the current per-type node execution counts; does not
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151 * affect the counts.
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152 * <p>
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153 * The map holds an array for each source, and elements of the a array corresponding to the
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154 * textual lines of that source. An array entry contains null if the corresponding line of
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155 * source is associated with no nodes of the relevant type, i.e. where no count was made. A
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156 * numeric entry represents the execution count at the corresponding line of source.
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157 * <p>
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158 * <b>Note:</b> source line numbers are 1-based, so array index {@code i} corresponds to source
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159 * line number {@code i + 1}
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160 */
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161 public Map<Source, Long[]> getCounts() {
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162
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163 /**
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164 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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165 * every line associated with an appropriately tagged AST node; iterable in order of source
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166 * name, then line number.
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167 */
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168 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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169
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170 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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171 entries.add(entry);
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172 }
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173 final Map<Source, Long[]> result = new HashMap<>();
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174 Source curSource = null;
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175 Long[] curLineTable = null;
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176 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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177 final LineLocation key = entry.getKey();
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178 final Source source = key.getSource();
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179 final int lineNo = key.getLineNumber();
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180 if (source != curSource) {
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181 if (curSource != null) {
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182 result.put(curSource, curLineTable);
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183 }
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184 curSource = source;
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185 curLineTable = new Long[source.getLineCount()];
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186 }
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187 curLineTable[lineNo - 1] = entry.getValue().count;
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188 }
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189 if (curSource != null) {
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190 result.put(curSource, curLineTable);
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191 }
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192 return result;
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193 }
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194
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195 /**
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196 * A default printer for the current line counts, producing lines of the form " (<count>) <line
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197 * number> : <text of line>", grouped by source.
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198 */
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199 public void print(PrintStream out) {
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200 out.println();
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201 out.println(countingTag.name() + " coverage:");
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202
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203 /**
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204 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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205 * every line associated with an appropriately tagged AST node; iterable in order of source
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206 * name, then line number.
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207 */
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208 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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209
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210 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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211 entries.add(entry);
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212 }
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213 Source curSource = null;
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214 int curLineNo = 1;
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215 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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216 final LineLocation key = entry.getKey();
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217 final Source source = key.getSource();
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218 final int lineNo = key.getLineNumber();
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219 if (source != curSource) {
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220 if (curSource != null) {
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221 while (curLineNo <= curSource.getLineCount()) {
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222 displayLine(out, null, curSource, curLineNo++);
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223 }
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224 }
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225 curSource = source;
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226 curLineNo = 1;
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227 out.println();
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228 out.println(source.getPath());
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229 }
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230 while (curLineNo < lineNo) {
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231 displayLine(out, null, curSource, curLineNo++);
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232 }
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233 displayLine(out, entry.getValue(), curSource, curLineNo++);
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234 }
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235 if (curSource != null) {
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236 while (curLineNo <= curSource.getLineCount()) {
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237 displayLine(out, null, curSource, curLineNo++);
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238 }
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239 }
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240 }
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241
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242 private static void displayLine(PrintStream out, CoverageRecord record, Source source, int lineNo) {
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243 if (record == null) {
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244 out.format("%14s", " ");
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245 } else {
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246 out.format("(%12d)", record.count);
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247 }
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248 out.format(" %3d: ", lineNo);
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249 out.println(source.getCode(lineNo));
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250 }
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251
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252 /**
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253 * A listener for events at each instrumented AST location. This listener counts
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254 * "execution calls" to the instrumented node.
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255 */
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256 private final class CoverageRecord extends DefaultSimpleInstrumentListener {
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257
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258 private final SourceSection srcSection; // The text of the code being counted
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259 private Instrument instrument; // The attached Instrument, in case need to remove.
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260 private long count = 0;
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261
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262 CoverageRecord(SourceSection srcSection) {
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263 this.srcSection = srcSection;
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264 }
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265
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266 @Override
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267 public void enter(Probe probe) {
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268 if (isEnabled()) {
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269 count++;
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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
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275 private static final class LineLocationEntryComparator implements Comparator<Entry<LineLocation, CoverageRecord>> {
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276
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277 public int compare(Entry<LineLocation, CoverageRecord> e1, Entry<LineLocation, CoverageRecord> e2) {
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278 return LineLocation.COMPARATOR.compare(e1.getKey(), e2.getKey());
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279 }
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280 }
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281
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282 /**
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283 * Attach a counting instrument to each node that is assigned a specified tag.
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284 */
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285 private class CoverageProbeListener extends DefaultProbeListener {
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286
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diff changeset
287 @Override
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288 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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289 if (countingTag == tag) {
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290
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diff changeset
291 final SourceSection srcSection = probe.getProbedSourceSection();
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292 if (srcSection == null) {
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293 // TODO (mlvdv) report this?
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diff changeset
294 } else if (!srcSection.getSource().isTaggedAs(Tags.NO_COVERAGE)) {
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295 // Get the source line where the
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296 final LineLocation lineLocation = srcSection.getLineLocation();
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297 CoverageRecord record = coverageMap.get(lineLocation);
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298 if (record != null) {
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299 // Another node starts on same line; count only the first (textually)
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diff changeset
300 if (srcSection.getCharIndex() > record.srcSection.getCharIndex()) {
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301 // Existing record, corresponds to code earlier on line
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302 return;
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303 } else {
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304 // Existing record, corresponds to code at a later position; replace it
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diff changeset
305 record.instrument.dispose();
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306 }
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307 }
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diff changeset
308
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diff changeset
309 final CoverageRecord coverage = new CoverageRecord(srcSection);
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diff changeset
310 final Instrument instrument = Instrument.create(coverage, CoverageTracker.class.getSimpleName());
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diff changeset
311 coverage.instrument = instrument;
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diff changeset
312 instruments.add(instrument);
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diff changeset
313 probe.attach(instrument);
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diff changeset
314 coverageMap.put(lineLocation, coverage);
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315 }
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316 }
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317 }
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318 }
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319
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320 }