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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/CoverageTracker.java @ 21987:b2d1c8ff592a

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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.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 01 Jul 2015 10:23:36 +0200
parents 9c8c0937da41
children 0f0e34039769
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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.*;
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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) {
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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278 return e1.getKey().compareTo(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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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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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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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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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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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 }