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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/LineToProbesMap.java @ 22003:5bc7f7b867ab

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Making debugger always on for each TruffleVM execution. Introducing EventConsumer to process such debugger events. Requesting each RootNode to be associated with a TruffleLanguage, so debugger can find out proper context for each Node where executions gets suspended.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Sat, 18 Jul 2015 18:03:36 +0200
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children dc83cc1f94f2 3aad794eec0e
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22003
5bc7f7b867ab Making debugger always on for each TruffleVM execution. Introducing EventConsumer to process such debugger events. Requesting each RootNode to be associated with a TruffleLanguage, so debugger can find out proper context for each Node where executions gets suspended.
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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.api.debug;
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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
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30 import com.oracle.truffle.api.instrument.*;
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31 import com.oracle.truffle.api.instrument.impl.DefaultProbeListener;
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32 import com.oracle.truffle.api.source.*;
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33
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34 /**
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35 * An {@link InstrumentationTool} that builds a map of every {@link Probe} attached to some AST,
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36 * indexed by {@link Source} and line number.
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37 */
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38 final class LineToProbesMap extends InstrumentationTool {
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39
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40 private static final boolean TRACE = false;
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41 private static final PrintStream OUT = System.out;
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42
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43 private static void trace(String msg) {
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44 OUT.println("LineToProbesMap: " + msg);
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45 }
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46
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47 /**
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48 * Map: Source line ==> probes associated with source sections starting on the line.
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49 */
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50 private final Map<LineLocation, Collection<Probe>> lineToProbesMap = new HashMap<>();
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51
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52 private final ProbeListener probeListener;
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53
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54 /**
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55 * Create a map of {@link Probe}s that collects information on all probes added to subsequently
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56 * created ASTs (once installed).
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57 */
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58 public LineToProbesMap() {
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59 this.probeListener = new LineToProbesListener();
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60 }
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61
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62 @Override
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63 protected boolean internalInstall() {
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64 Probe.addProbeListener(probeListener);
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65 return true;
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66 }
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67
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68 @Override
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69 protected void internalReset() {
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70 lineToProbesMap.clear();
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71 }
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72
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73 @Override
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74 protected void internalDispose() {
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75 Probe.removeProbeListener(probeListener);
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76 }
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77
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78 /**
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79 * Returns the {@link Probe}, if any, associated with a specific line of guest language code; if
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80 * more than one, return the one with the first starting character location.
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81 */
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82 public Probe findFirstProbe(LineLocation lineLocation) {
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83 Probe probe = null;
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84 final Collection<Probe> probes = findProbes(lineLocation);
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85 for (Probe probesOnLine : probes) {
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86 if (probe == null) {
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87 probe = probesOnLine;
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88 } else if (probesOnLine.getProbedSourceSection().getCharIndex() < probe.getProbedSourceSection().getCharIndex()) {
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89 probe = probesOnLine;
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90 }
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91 }
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92 return probe;
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93 }
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94
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95 /**
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96 * Returns all {@link Probe}s whose associated source begins at the given {@link LineLocation},
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97 * an empty list if none.
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98 */
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99 public Collection<Probe> findProbes(LineLocation line) {
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100 final Collection<Probe> probes = lineToProbesMap.get(line);
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101 if (probes == null) {
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102 return Collections.emptyList();
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103 }
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104 return Collections.unmodifiableCollection(probes);
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105 }
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106
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107 private class LineToProbesListener extends DefaultProbeListener {
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108
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109 @Override
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110 public void newProbeInserted(Probe probe) {
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111 final SourceSection sourceSection = probe.getProbedSourceSection();
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112 if (sourceSection != null && sourceSection.getSource() != null) {
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113 final LineLocation lineLocation = sourceSection.getLineLocation();
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114 if (TRACE) {
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115 trace("ADD " + lineLocation.getShortDescription() + " ==> " + probe.getShortDescription());
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116 }
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117 Collection<Probe> probes = lineToProbesMap.get(lineLocation);
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118 if (probes == null) {
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119 probes = new ArrayList<>(2);
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120 lineToProbesMap.put(lineLocation, probes);
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121 } else {
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122 assert !probes.contains(probe);
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123 }
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124 probes.add(probe);
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125 }
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126 }
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127 }
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128 }