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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/impl/ProbeManager.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
parents 50d79ad439f1
children 7bfbad29d331
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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.instrument.impl.InstrumentationNode.ProbeCallback;
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31 import com.oracle.truffle.api.instrument.impl.InstrumentationNode.ProbeImpl;
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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 * Factory and services for AST {@link Probe}s
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36 */
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37 public final class ProbeManager {
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38
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39 /**
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40 * The collection of {@link ProbeListener}s to call.
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41 */
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42 private final List<ProbeListener> probeListeners = new ArrayList<>();
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43
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44 /**
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45 * The collection of all probes added.
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46 */
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47 private final List<ProbeImpl> probeList = new ArrayList<>();
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48
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49 /**
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50 * The callback to be triggered by the {@link #tagTrap}.
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51 *
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52 */
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53 private final ProbeCallback probeCallback;
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54
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55 /**
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56 * When non-null, "enter" events with matching tags will trigger a callback.
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57 */
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58 private SyntaxTagTrap tagTrap = null;
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59
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60 public ProbeManager() {
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61 this.probeCallback = new ProbeCallback() {
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62 /**
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63 * Receives (from the {@link Probe} implementation) and distributes notification that a
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64 * {@link Probe} has acquired a new {@linkplain SyntaxTag tag}.
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65 */
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66 public void newTagAdded(ProbeImpl probe, SyntaxTag tag) {
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67 for (ProbeListener listener : probeListeners) {
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68 listener.probeTaggedAs(probe, tag);
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69 }
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70 if (tagTrap != null && tag == tagTrap.getTag()) {
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71 probe.setTrap(tagTrap);
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72 }
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73 }
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74 };
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75 }
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76
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77 /**
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78 * Add a {@link ProbeListener} to receive events.
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79 *
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80 * @param listener The listener to be added.
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81 */
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82 public void addProbeListener(ProbeListener listener) {
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83 assert listener != null;
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84 probeListeners.add(listener);
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85 }
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86
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87 /**
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88 * Remove a {@link ProbeListener}. If no matching probe listener is found, nothing happens.
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89 *
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90 * @param removeListener
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91 */
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92 public void removeProbeListener(ProbeListener removeListener) {
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93 final List<ProbeListener> listeners = new ArrayList<>(probeListeners);
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94 for (ProbeListener listener : listeners) {
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95 if (listener == removeListener) {
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96 probeListeners.remove(listener);
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97 }
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98 }
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99 }
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100
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101 /**
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102 * Creates a {@link Probe} for the given {@link SourceSection} and informs all
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103 * {@link ProbeListener}s stored in this manager of its creation.
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104 *
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105 * @param source The source section to associate with this probe.
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106 * @return The probe that was created.
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107 */
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108 public Probe createProbe(SourceSection source) {
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109 assert source != null;
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110
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111 ProbeImpl probe = InstrumentationNode.createProbe(source, probeCallback);
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112 probeList.add(probe);
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113
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114 for (ProbeListener listener : probeListeners) {
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115 listener.newProbeInserted(source, probe);
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116 }
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117
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118 return probe;
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119 }
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120
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121 /**
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122 * Returns a collection of {@link Probe}s created by this manager that have the given
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123 * {@link SyntaxTag}.
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124 *
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125 * @param tag The tag to search for.
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126 * @return An iterable collection of probes containing the given tag.
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127 */
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128 public Collection<Probe> findProbesTaggedAs(SyntaxTag tag) {
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129 final List<Probe> probes = new ArrayList<>();
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130 for (Probe probe : probeList) {
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131 if (tag == null || probe.isTaggedAs(tag)) {
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132 probes.add(probe);
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133 }
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134 }
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135 return probes;
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136 }
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137
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138 /**
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139 * Calls {@link ProbeImpl#setTrap(SyntaxTagTrap)} for all probes with the given
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140 * {@link SyntaxTag} . There can only be one tag trap set at a time. An
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141 * {@link IllegalStateException} is thrown if this is called and a tag trap has already been
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142 * set.
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143 *
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144 * @param tagTrap The {@link SyntaxTagTrap} to set.
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145 */
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146 public void setTagTrap(SyntaxTagTrap tagTrap) {
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147 assert tagTrap != null;
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148 if (this.tagTrap != null) {
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149 throw new IllegalStateException("trap already set");
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150 }
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151 this.tagTrap = tagTrap;
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152
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153 SyntaxTag tag = tagTrap.getTag();
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154 for (ProbeImpl probe : probeList) {
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155 if (probe.isTaggedAs(tag)) {
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156 probe.setTrap(tagTrap);
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157 }
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158 }
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159 }
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160
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161 /**
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162 * Clears the current {@link SyntaxTagTrap}. If no trap has been set, an
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163 * {@link IllegalStateException} is thrown.
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164 */
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165 public void clearTagTrap() {
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166 if (this.tagTrap == null) {
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167 throw new IllegalStateException("no trap set");
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168 }
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169 for (ProbeImpl probe : probeList) {
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170 if (probe.isTaggedAs(tagTrap.getTag())) {
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171 probe.setTrap(null);
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172 }
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173 }
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174 tagTrap = null;
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175 }
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176
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177 }