Mercurial > hg > truffle
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/tools/CoverageTracker.java @ 19187:c5b20395a8bf
Truffle/Instrumentation: eclipseformat
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Sun, 08 Feb 2015 20:14:30 -0800 |
parents | 3d2296dbace9 |
children | a2ff253c458f |
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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.CompilerDirectives.TruffleBoundary; |
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33 import com.oracle.truffle.api.frame.*; |
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34 import com.oracle.truffle.api.instrument.*; |
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35 import com.oracle.truffle.api.instrument.impl.*; |
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36 import com.oracle.truffle.api.nodes.*; |
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37 import com.oracle.truffle.api.nodes.Node.Child; |
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38 import com.oracle.truffle.api.source.*; |
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39 |
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40 /** |
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41 * An {@link InstrumentationTool} that counts interpreter <em>execution calls</em> to AST nodes that |
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42 * hold a specified {@linkplain SyntaxTag tag}, tabulated by source and line number associated with |
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43 * each node. Tags are presumed to be applied external to the tool. If no tag is specified, |
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44 * {@linkplain StandardSyntaxTag#STATEMENT STATEMENT} is used, corresponding to conventional |
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45 * behavior for code coverage tools. |
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46 * <p> |
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47 * <b>Tool Life Cycle</b> |
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48 * <p> |
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49 * See {@link InstrumentationTool} for the life cycle common to all such tools. |
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50 * <p> |
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51 * <b>Execution Counts</b> |
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52 * <p> |
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53 * <ul> |
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54 * <li>"Execution call" on a node is is defined as invocation of a node method that is instrumented |
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55 * to produce the event {@link TruffleEventReceiver#enter(Node, VirtualFrame)};</li> |
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56 * <li>Execution calls are tabulated only at <em>instrumented</em> nodes, i.e. those for which |
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57 * {@linkplain Node#isInstrumentable() isInstrumentable() == true};</li> |
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58 * <li>Execution calls are tabulated only at nodes present in the AST when originally created; |
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59 * dynamically added nodes will not be instrumented.</li> |
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60 * </ul> |
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61 * </p> |
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62 * <b>Results</b> |
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63 * <p> |
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64 * A modification-safe copy of the {@linkplain #getCounts() counts} can be retrieved at any time, |
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65 * without effect on the state of the tool. |
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66 * </p> |
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67 * <p> |
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68 * A "default" {@linkplain #print(PrintStream) print()} method can summarizes the current counts at |
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69 * any time in a simple textual format, with no other effect on the state of the tool. |
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70 * </p> |
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71 * |
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72 * @see Instrument |
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73 * @see SyntaxTag |
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74 */ |
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75 public final class CoverageTracker extends InstrumentationTool { |
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76 |
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77 /** Counting data. */ |
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78 private final Map<LineLocation, CoverageCounter> counters = new HashMap<>(); |
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79 |
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80 /** For disposal. */ |
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81 private final List<Instrument> instruments = new ArrayList<>(); |
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82 |
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83 /** |
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84 * Counting is restricted to nodes holding this tag. |
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85 */ |
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86 private final SyntaxTag countingTag; |
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87 |
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88 private final ProbeListener probeListener; |
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89 |
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90 /** |
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91 * Create a per-line coverage tool for nodes tagged as {@linkplain StandardSyntaxTag#STATEMENT |
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92 * statements} in subsequently created ASTs. |
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93 */ |
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94 public CoverageTracker() { |
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95 this(StandardSyntaxTag.STATEMENT); |
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96 } |
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97 |
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98 /** |
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99 * Create a per-line coverage tool for nodes tagged as specified, presuming that tags applied |
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100 * outside this tool. |
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101 */ |
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102 public CoverageTracker(SyntaxTag tag) { |
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103 this.probeListener = new CoverageProbeListener(); |
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104 this.countingTag = tag; |
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105 } |
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106 |
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107 @Override |
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108 protected boolean internalInstall() { |
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109 Probe.addProbeListener(probeListener); |
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110 return true; |
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111 } |
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112 |
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113 @Override |
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114 protected void internalReset() { |
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115 counters.clear(); |
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116 } |
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117 |
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118 @Override |
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119 protected void internalDispose() { |
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120 Probe.removeProbeListener(probeListener); |
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121 for (Instrument instrument : instruments) { |
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122 instrument.dispose(); |
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123 } |
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124 } |
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125 |
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126 /** |
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127 * Gets a modification-safe summary of the current per-type node execution counts; does not |
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128 * affect the counts. |
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129 * <p> |
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130 * The map holds an array for each source, and elements of the a array corresponding to the |
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131 * textual lines of that source. An array entry contains null if the corresponding line of |
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132 * source is associated with no nodes of the relevant type, i.e. where no count was made. A |
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133 * numeric entry represents the execution count at the corresponding line of source. |
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134 * <p> |
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135 * <b>Note:</b> source line numbers are 1-based, so array index {@code i} corresponds to source |
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136 * line number {@code i + 1} |
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137 */ |
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138 public Map<Source, Long[]> getCounts() { |
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139 |
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140 /** |
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141 * Counters for every {Source, line number} for which a counter was installed, i.e. for |
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142 * every line associated with an appropriately tagged AST node; iterable in order of source |
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143 * name, then line number. |
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144 */ |
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145 final TreeSet<Entry<LineLocation, CoverageCounter>> entries = new TreeSet<>(new LineLocationEntryComparator()); |
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146 |
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147 final Map<Source, Long[]> results = new HashMap<>(); |
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148 |
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149 for (Entry<LineLocation, CoverageCounter> entry : counters.entrySet()) { |
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150 entries.add(entry); |
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151 } |
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152 Source curSource = null; |
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153 Long[] curLineTable = null; |
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154 for (Entry<LineLocation, CoverageCounter> entry : entries) { |
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155 final LineLocation key = entry.getKey(); |
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156 final Source source = key.getSource(); |
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157 final int lineNo = key.getLineNumber(); |
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158 if (source != curSource) { |
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159 if (curSource != null) { |
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160 results.put(curSource, curLineTable); |
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161 } |
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162 curSource = source; |
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163 curLineTable = new Long[source.getLineCount()]; |
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164 } |
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165 curLineTable[lineNo - 1] = entry.getValue().count.longValue(); |
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166 } |
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167 if (curSource != null) { |
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168 results.put(curSource, curLineTable); |
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169 } |
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170 return results; |
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171 } |
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172 |
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173 /** |
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174 * A default printer for the current line counts, producing lines of the form " (<count>) <line |
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175 * number> : <text of line>", grouped by source. |
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176 */ |
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177 public void print(PrintStream out) { |
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178 out.println(); |
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179 out.println(countingTag.name() + " coverage:"); |
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180 |
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181 /** |
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182 * Counters for every {Source, line number} for which a counter was installed, i.e. for |
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183 * every line associated with an appropriately tagged AST node; iterable in order of source |
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184 * name, then line number. |
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185 */ |
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186 final TreeSet<Entry<LineLocation, CoverageCounter>> entries = new TreeSet<>(new LineLocationEntryComparator()); |
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187 |
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188 for (Entry<LineLocation, CoverageCounter> entry : counters.entrySet()) { |
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189 entries.add(entry); |
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190 } |
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191 Source curSource = null; |
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192 int curLineNo = 1; |
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193 for (Entry<LineLocation, CoverageCounter> entry : entries) { |
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194 final LineLocation key = entry.getKey(); |
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195 final Source source = key.getSource(); |
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196 final int lineNo = key.getLineNumber(); |
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197 if (source != curSource) { |
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198 if (curSource != null) { |
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199 while (curLineNo <= curSource.getLineCount()) { |
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200 displayLine(out, null, curSource, curLineNo++); |
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201 } |
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202 } |
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203 curSource = source; |
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204 curLineNo = 1; |
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205 out.println(); |
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206 out.println(source.getPath()); |
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207 } |
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208 while (curLineNo < lineNo) { |
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209 displayLine(out, null, curSource, curLineNo++); |
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210 } |
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211 displayLine(out, entry.getValue().count, curSource, curLineNo++); |
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212 } |
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213 if (curSource != null) { |
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214 while (curLineNo <= curSource.getLineCount()) { |
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215 displayLine(out, null, curSource, curLineNo++); |
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216 } |
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217 } |
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218 } |
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219 |
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220 private static void displayLine(PrintStream out, AtomicLong value, Source source, int lineNo) { |
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221 if (value == null) { |
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222 out.format("%14s", " "); |
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223 } else { |
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224 out.format("(%12d)", value.longValue()); |
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225 } |
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226 out.format(" %3d: ", lineNo); |
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227 out.println(source.getCode(lineNo)); |
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228 } |
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229 |
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230 /** |
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231 * A receiver for events at each instrumented AST location. This receiver counts |
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232 * "execution calls" to the instrumented node and is <em>stateful</em>. State in receivers must |
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233 * be considered carefully since ASTs, along with all instrumentation (including event receivers |
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234 * such as this) are routinely cloned by the Truffle runtime. AST cloning is <em>shallow</em> |
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235 * (for non- {@link Child} nodes), so in this case the actual count <em>is shared</em> among all |
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236 * the clones; the count is also held in a table indexed by source line. |
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237 * <p> |
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238 * In contrast, a primitive field would <em>not</em> be shared among clones and resulting counts |
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239 * would not be accurate. |
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240 */ |
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241 private final class CoverageEventReceiver extends DefaultEventReceiver { |
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242 |
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243 /** |
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244 * Shared by all clones of the associated instrument and by the table of counters for the |
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245 * line. |
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246 */ |
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247 private final AtomicLong count; |
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248 |
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249 CoverageEventReceiver(AtomicLong count) { |
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250 this.count = count; |
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251 } |
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252 |
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253 @Override |
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254 @TruffleBoundary |
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255 public void enter(Node node, VirtualFrame frame) { |
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256 if (isEnabled()) { |
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257 count.getAndIncrement(); |
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258 } |
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259 } |
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260 } |
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261 |
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262 private static final class LineLocationEntryComparator implements Comparator<Entry<LineLocation, CoverageCounter>> { |
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263 |
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264 public int compare(Entry<LineLocation, CoverageCounter> e1, Entry<LineLocation, CoverageCounter> e2) { |
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265 return LineLocation.COMPARATOR.compare(e1.getKey(), e2.getKey()); |
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266 } |
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267 } |
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268 |
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269 /** |
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270 * Attach a counting instrument to each node that is assigned a specified tag. |
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271 */ |
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272 private class CoverageProbeListener extends DefaultProbeListener { |
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273 |
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274 @Override |
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275 public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) { |
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276 if (countingTag == tag) { |
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277 |
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278 final SourceSection srcSection = probe.getProbedSourceSection(); |
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279 if (srcSection == null) { |
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280 // TODO (mlvdv) report this? |
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281 } else { |
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282 final LineLocation lineLocation = srcSection.getLineLocation(); |
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283 CoverageCounter counter = counters.get(lineLocation); |
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284 if (counter != null) { |
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285 // Another node starts on same line; count only the first (textually) |
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286 if (srcSection.getCharIndex() > counter.srcSection.getCharIndex()) { |
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287 // Counter already in place, corresponds to code earlier on line |
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288 return; |
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289 } else { |
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290 // Counter already in place, corresponds to later code; replace it |
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291 counter.instrument.dispose(); |
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292 } |
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293 } |
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294 final AtomicLong count = new AtomicLong(); |
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295 final CoverageEventReceiver eventReceiver = new CoverageEventReceiver(count); |
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296 final Instrument instrument = Instrument.create(eventReceiver, CoverageTracker.class.getSimpleName()); |
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297 instruments.add(instrument); |
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298 probe.attach(instrument); |
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299 counters.put(lineLocation, new CoverageCounter(srcSection, instrument, count)); |
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300 } |
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301 } |
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302 } |
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303 } |
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304 |
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305 private class CoverageCounter { |
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306 final SourceSection srcSection; |
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307 final Instrument instrument; |
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308 final AtomicLong count; |
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309 |
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310 CoverageCounter(SourceSection srcSection, Instrument instrument, AtomicLong count) { |
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311 this.srcSection = srcSection; |
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312 this.instrument = instrument; |
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313 this.count = count; |
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314 } |
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315 } |
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316 |
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317 } |