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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/impl/LineLocationToProbeCollectionMap.java @ 16856:7833417c8172

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Changes to Instrumentation
author David Piorkowski <david.piorkowski@oracle.com>
date Mon, 18 Aug 2014 14:36:12 -0700
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children 7bfbad29d331
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16856
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1 /*
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2 * Copyright (c) 2013, 2014, 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.instrument.impl;
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26
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27 import java.util.*;
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28
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29 import com.oracle.truffle.api.instrument.*;
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30 import com.oracle.truffle.api.source.*;
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31
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32 /**
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33 * This class maintains a mapping from {@link LineLocation} to a collection of {@link Probe}s to be
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34 * used by debugging tools.
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35 *
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36 */
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37 public class LineLocationToProbeCollectionMap implements ProbeListener {
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38 /**
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39 * Map: Source line ==> probes associated with source sections starting on the line.
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40 */
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41 private final Map<LineLocation, Collection<Probe>> lineToProbesMap = new HashMap<>();
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42
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43 public LineLocationToProbeCollectionMap() {
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44 }
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45
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46 /**
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47 * Adds the current wrapper's child's line location and probe to this map.
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48 */
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49 public void newProbeInserted(SourceSection source, Probe probe) {
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50 final LineLocation line = source.getLineLocation();
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51 this.addProbeToLine(line, probe);
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52 }
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53
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54 /**
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55 * Does nothing.
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56 */
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57 public void probeTaggedAs(Probe probe, SyntaxTag tag) {
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58
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59 }
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60
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61 /**
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62 * Returns the {@link Probe}, if any, associated with source that starts on a specified line; if
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63 * there are more than one, return the one with the first character location.
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64 */
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65 public Probe findLineProbe(LineLocation lineLocation) {
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66 Probe probe = null;
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67 final Collection<Probe> probes = getProbesAtLine(lineLocation);
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68 for (Probe probeOnLine : probes) {
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69 if (probe == null) {
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70 probe = probeOnLine;
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71 } else if (probeOnLine.getSourceLocation().getCharIndex() < probe.getSourceLocation().getCharIndex()) {
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72 probe = probeOnLine;
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73 }
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74 }
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75 return probe;
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76 }
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77
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78 /**
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79 * Adds a probe to the given line.
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80 * <p>
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81 * If the line already exists in the internal {@link #lineToProbesMap}, this probe will be added
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82 * to the existing collection. If no line already exists in the internal map, then a new key is
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83 * added along with a new collection containing the probe.
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84 * <p>
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85 * This class requires that each added line/probe pair hasn't been previously added. However,
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86 * attaching the same probe to a new line location is allowed.
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87 *
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88 * @param line The {@link LineLocation} to attach the probe to.
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89 * @param probe The {@link Probe} to attach for that line location.
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90 */
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91 private void addProbeToLine(LineLocation line, Probe probe) {
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92
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93 if (!lineToProbesMap.containsKey(line)) {
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94 // Key does not exist, add new probe list
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95 final ArrayList<Probe> newProbeList = new ArrayList<>(2);
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96 newProbeList.add(probe);
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97 lineToProbesMap.put(line, newProbeList);
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98 } else {
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99 // Probe list exists, add to existing
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100 final Collection<Probe> existingProbeList = lineToProbesMap.get(line);
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101 assert !existingProbeList.contains(probe);
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102 existingProbeList.add(probe);
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103 }
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104 }
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105
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106 /**
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107 * Returns a collection of {@link Probe}s at the given {@link LineLocation}. If there are no
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108 * probes at that line, an empty list is returned.
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109 *
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110 * @param line The line to check.
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111 * @return A iterable collection of probes at the given line.
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112 */
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113 private Collection<Probe> getProbesAtLine(LineLocation line) {
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114 Collection<Probe> probeList = lineToProbesMap.get(line);
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115
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116 if (probeList == null)
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117 probeList = new ArrayList<>(2);
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118
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119 return probeList;
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120 }
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121 }