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annotate truffle/com.oracle.truffle.tools/src/com/oracle/truffle/tools/LineToProbesMap.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents 0d36601f233e
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1 /*
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2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.tools;
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26
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27 import java.io.PrintStream;
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28 import java.util.ArrayList;
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29 import java.util.Collection;
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30 import java.util.Collections;
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31 import java.util.HashMap;
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32 import java.util.Map;
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33
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34 import com.oracle.truffle.api.instrument.Instrumenter;
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35 import com.oracle.truffle.api.instrument.Probe;
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36 import com.oracle.truffle.api.instrument.ProbeListener;
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37 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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38 import com.oracle.truffle.api.source.LineLocation;
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39 import com.oracle.truffle.api.source.Source;
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40 import com.oracle.truffle.api.source.SourceSection;
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41
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42 /**
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43 * An {@linkplain Instrumenter.Tool Instrumentation Tool} that builds a map of every {@link Probe}
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44 * attached to some AST, indexed by {@link Source} and line number.
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45 */
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46 public final class LineToProbesMap extends Instrumenter.Tool {
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47
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48 private static final boolean TRACE = false;
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49 private static final PrintStream OUT = System.out;
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50
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51 private static void trace(String msg) {
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52 OUT.println("LineToProbesMap: " + msg);
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53 }
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54
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55 /**
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56 * Map: Source line ==> probes associated with source sections starting on the line.
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57 */
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58 private final Map<LineLocation, Collection<Probe>> lineToProbesMap = new HashMap<>();
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59
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60 private final ProbeListener probeListener;
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61
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62 /**
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63 * Create a map of {@link Probe}s that collects information on all probes added to subsequently
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64 * created ASTs (once installed).
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65 */
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66 public LineToProbesMap() {
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67 this.probeListener = new LineToProbesListener();
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68 }
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69
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70 @Override
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71 protected boolean internalInstall() {
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72 final Instrumenter instrumenter = getInstrumenter();
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73 for (Probe probe : instrumenter.findProbesTaggedAs(null)) {
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74 addMapEntry(probe);
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75 }
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76 instrumenter.addProbeListener(probeListener);
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77 return true;
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78 }
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79
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80 @Override
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81 protected void internalReset() {
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82 lineToProbesMap.clear();
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83 }
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84
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85 @Override
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86 protected void internalDispose() {
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87 getInstrumenter().removeProbeListener(probeListener);
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88 }
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89
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90 /**
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91 * Returns the {@link Probe}, if any, associated with a specific line of guest language code; if
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92 * more than one, return the one with the first starting character location.
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93 */
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94 public Probe findFirstProbe(LineLocation lineLocation) {
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95 Probe probe = null;
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96 final Collection<Probe> probes = findProbes(lineLocation);
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97 for (Probe probesOnLine : probes) {
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98 if (probe == null) {
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99 probe = probesOnLine;
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100 } else if (probesOnLine.getProbedSourceSection().getCharIndex() < probe.getProbedSourceSection().getCharIndex()) {
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101 probe = probesOnLine;
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102 }
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103 }
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104 return probe;
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105 }
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106
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107 /**
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108 * Returns all {@link Probe}s whose associated source begins at the given {@link LineLocation},
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109 * an empty list if none.
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110 */
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111 public Collection<Probe> findProbes(LineLocation line) {
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112 final Collection<Probe> probes = lineToProbesMap.get(line);
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113 if (probes == null) {
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114 return Collections.emptyList();
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115 }
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116 return Collections.unmodifiableCollection(probes);
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117 }
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118
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119 private class LineToProbesListener extends DefaultProbeListener {
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120
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121 @Override
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122 public void newProbeInserted(Probe probe) {
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123 addMapEntry(probe);
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124 }
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125 }
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126
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127 private void addMapEntry(Probe probe) {
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128 final SourceSection sourceSection = probe.getProbedSourceSection();
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129 if (sourceSection != null && sourceSection.getSource() != null) {
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130 final LineLocation lineLocation = sourceSection.getLineLocation();
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131 if (TRACE) {
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132 trace("ADD " + lineLocation.getShortDescription() + " ==> " + probe.getShortDescription());
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133 }
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134 Collection<Probe> probes = lineToProbesMap.get(lineLocation);
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135 if (probes == null) {
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136 probes = new ArrayList<>(2);
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137 lineToProbesMap.put(lineLocation, probes);
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138 } else {
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139 assert !probes.contains(probe);
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140 }
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141 probes.add(probe);
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142 }
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143 }
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144 }