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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/tools/CoverageTracker.java @ 19248:a2ff253c458f

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Truffle/Instrumentation: code cleanups in tools CoverageTracker and NodeExecCounter, especially for tutorial value
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Tue, 10 Feb 2015 16:44:19 -0800
parents c5b20395a8bf
children b5467bb34b24
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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.Map.Entry;
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30 import java.util.concurrent.atomic.*;
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31
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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 import com.oracle.truffle.api.source.*;
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38
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39 /**
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40 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes that
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41 * hold a specified {@linkplain SyntaxTag tag}, tabulated by source and line number associated with
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42 * each node. Tags are presumed to be applied external to the tool. If no tag is specified,
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43 * {@linkplain StandardSyntaxTag#STATEMENT STATEMENT} is used, corresponding to conventional
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44 * behavior for code coverage tools.
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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 TruffleEventListener#enter(Node, VirtualFrame)};</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 /** Counting data. */
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77 private final Map<LineLocation, CoverageRecord> coverageMap = new HashMap<>();
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78
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79 /** Needed for disposal. */
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80 private final List<Instrument> instruments = new ArrayList<>();
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81
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82 /**
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83 * Coverage counting is restricted to nodes holding this tag.
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84 */
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85 private final SyntaxTag countingTag;
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86
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87 private final ProbeListener probeListener;
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88
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89 /**
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90 * Create a per-line coverage tool for nodes tagged as {@linkplain StandardSyntaxTag#STATEMENT
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91 * statements} in subsequently created ASTs.
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92 */
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93 public CoverageTracker() {
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94 this(StandardSyntaxTag.STATEMENT);
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95 }
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96
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97 /**
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98 * Create a per-line coverage tool for nodes tagged as specified, presuming that tags applied
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99 * outside this tool.
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100 */
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101 public CoverageTracker(SyntaxTag tag) {
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102 this.probeListener = new CoverageProbeListener();
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103 this.countingTag = tag;
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104 }
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105
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106 @Override
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107 protected boolean internalInstall() {
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108 Probe.addProbeListener(probeListener);
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109 return true;
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110 }
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111
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112 @Override
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113 protected void internalReset() {
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114 coverageMap.clear();
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115 }
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116
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117 @Override
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118 protected void internalDispose() {
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119 Probe.removeProbeListener(probeListener);
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120 for (Instrument instrument : instruments) {
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121 instrument.dispose();
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122 }
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123 }
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124
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125 /**
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126 * Gets a modification-safe summary of the current per-type node execution counts; does not
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127 * affect the counts.
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128 * <p>
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129 * The map holds an array for each source, and elements of the a array corresponding to the
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130 * textual lines of that source. An array entry contains null if the corresponding line of
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131 * source is associated with no nodes of the relevant type, i.e. where no count was made. A
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132 * numeric entry represents the execution count at the corresponding line of source.
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133 * <p>
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134 * <b>Note:</b> source line numbers are 1-based, so array index {@code i} corresponds to source
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135 * line number {@code i + 1}
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136 */
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137 public Map<Source, Long[]> getCounts() {
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138
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139 /**
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140 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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141 * every line associated with an appropriately tagged AST node; iterable in order of source
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142 * name, then line number.
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143 */
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144 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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145
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146 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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147 entries.add(entry);
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148 }
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149 final Map<Source, Long[]> result = new HashMap<>();
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150 Source curSource = null;
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151 Long[] curLineTable = null;
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152 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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153 final LineLocation key = entry.getKey();
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154 final Source source = key.getSource();
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155 final int lineNo = key.getLineNumber();
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156 if (source != curSource) {
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157 if (curSource != null) {
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158 result.put(curSource, curLineTable);
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159 }
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160 curSource = source;
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161 curLineTable = new Long[source.getLineCount()];
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162 }
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163 curLineTable[lineNo - 1] = entry.getValue().count.longValue();
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164 }
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165 if (curSource != null) {
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166 result.put(curSource, curLineTable);
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167 }
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168 return result;
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169 }
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170
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171 /**
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172 * A default printer for the current line counts, producing lines of the form " (<count>) <line
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173 * number> : <text of line>", grouped by source.
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174 */
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175 public void print(PrintStream out) {
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176 out.println();
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177 out.println(countingTag.name() + " coverage:");
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178
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179 /**
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180 * Counters for every {Source, line number} for which a counter was installed, i.e. for
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181 * every line associated with an appropriately tagged AST node; iterable in order of source
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182 * name, then line number.
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183 */
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184 final TreeSet<Entry<LineLocation, CoverageRecord>> entries = new TreeSet<>(new LineLocationEntryComparator());
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185
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186 for (Entry<LineLocation, CoverageRecord> entry : coverageMap.entrySet()) {
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187 entries.add(entry);
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188 }
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189 Source curSource = null;
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190 int curLineNo = 1;
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191 for (Entry<LineLocation, CoverageRecord> entry : entries) {
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192 final LineLocation key = entry.getKey();
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193 final Source source = key.getSource();
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194 final int lineNo = key.getLineNumber();
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195 if (source != curSource) {
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196 if (curSource != null) {
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197 while (curLineNo <= curSource.getLineCount()) {
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198 displayLine(out, null, curSource, curLineNo++);
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199 }
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200 }
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201 curSource = source;
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202 curLineNo = 1;
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203 out.println();
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204 out.println(source.getPath());
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205 }
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206 while (curLineNo < lineNo) {
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207 displayLine(out, null, curSource, curLineNo++);
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208 }
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209 displayLine(out, entry.getValue().count, curSource, curLineNo++);
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210 }
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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 }
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217
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218 private static void displayLine(PrintStream out, AtomicLong value, Source source, int lineNo) {
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219 if (value == null) {
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220 out.format("%14s", " ");
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221 } else {
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222 out.format("(%12d)", value.longValue());
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223 }
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224 out.format(" %3d: ", lineNo);
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225 out.println(source.getCode(lineNo));
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226 }
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227
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228 /**
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229 * A listener for events at each instrumented AST location. This listener counts
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230 * "execution calls" to the instrumented node and is <em>stateful</em>. State in listeners must
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231 * be considered carefully since ASTs, along with all instrumentation (including event listener
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232 * such as this) are routinely cloned by the Truffle runtime. AST cloning is <em>shallow</em>
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233 * (for non- {@link Child} nodes), so in this case the actual count <em>is shared</em> among all
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234 * the clones; the count is also held in a table indexed by source line.
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235 * <p>
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236 * In contrast, a primitive field would <em>not</em> be shared among clones and resulting counts
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237 * would not be accurate.
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238 */
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239 private final class CoverageEventListener extends DefaultEventListener {
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240
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241 /**
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242 * Shared by all clones of the associated instrument and by the table of counters for the
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243 * line.
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244 */
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245 private final AtomicLong count;
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246
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247 CoverageEventListener(AtomicLong count) {
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248 this.count = count;
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249 }
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250
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251 @Override
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252 public void enter(Node node, VirtualFrame frame) {
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253 if (isEnabled()) {
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254 count.getAndIncrement();
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255 }
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256 }
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257 }
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258
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259 private static final class LineLocationEntryComparator implements Comparator<Entry<LineLocation, CoverageRecord>> {
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260
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261 public int compare(Entry<LineLocation, CoverageRecord> e1, Entry<LineLocation, CoverageRecord> e2) {
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262 return LineLocation.COMPARATOR.compare(e1.getKey(), e2.getKey());
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263 }
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264 }
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265
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266 /**
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267 * Attach a counting instrument to each node that is assigned a specified tag.
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268 */
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269 private class CoverageProbeListener extends DefaultProbeListener {
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270
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271 @Override
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272 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
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273 if (countingTag == tag) {
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274
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275 final SourceSection srcSection = probe.getProbedSourceSection();
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276 if (srcSection == null) {
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277 // TODO (mlvdv) report this?
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278 } else {
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279 // Get the source line where the
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280 final LineLocation lineLocation = srcSection.getLineLocation();
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281 CoverageRecord record = coverageMap.get(lineLocation);
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282 if (record != null) {
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283 // Another node starts on same line; count only the first (textually)
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284 if (srcSection.getCharIndex() > record.srcSection.getCharIndex()) {
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285 // Record already in place, corresponds to code earlier on line
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286 return;
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287 } else {
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288 // Record already in place, corresponds to later code; replace it
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289 record.instrument.dispose();
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290 }
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291 }
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292 final AtomicLong count = new AtomicLong();
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293 final CoverageEventListener eventListener = new CoverageEventListener(count);
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294 final Instrument instrument = Instrument.create(eventListener, CoverageTracker.class.getSimpleName());
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295 instruments.add(instrument);
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296 probe.attach(instrument);
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297 coverageMap.put(lineLocation, new CoverageRecord(srcSection, instrument, count));
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298 }
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299 }
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300 }
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301 }
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302
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303 private class CoverageRecord {
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304
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305 final SourceSection srcSection; // The text of the code being counted
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306 final Instrument instrument; // The attached Instrument, in case need to remove.
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307 final AtomicLong count;
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308
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309 CoverageRecord(SourceSection srcSection, Instrument instrument, AtomicLong count) {
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310 this.srcSection = srcSection;
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311 this.instrument = instrument;
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312 this.count = count;
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313 }
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314 }
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315
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316 }