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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/impl/ProbeManager.java @ 18163:c88ab4f1f04a

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re-enabled Checkstyle with the release of 6.0 that supports Java 8; fixed existing Checkstyle warnings
author Doug Simon <doug.simon@oracle.com>
date Fri, 24 Oct 2014 16:18:10 +0200
parents 3ad18f453679
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 private final List<ProbeListener> probeListeners = new ArrayList<>();
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40
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41 private final List<ProbeImpl> allProbes = new ArrayList<>();
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42
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43 /**
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44 * Called when a {@link #tagTrap} is activated in a Probe.
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45 */
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46 private final ProbeCallback probeCallback;
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47
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48 /**
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49 * When non-null, "enter" events with matching tags will trigger a callback.
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50 */
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51 private SyntaxTagTrap tagTrap = null;
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52
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53 public ProbeManager() {
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54 this.probeCallback = new ProbeCallback() {
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55 /**
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56 * Receives (from the {@link Probe} implementation) and distributes notification that a
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57 * {@link Probe} has acquired a new {@linkplain SyntaxTag tag}.
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58 */
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59 public void newTagAdded(ProbeImpl probe, SyntaxTag tag) {
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60 for (ProbeListener listener : probeListeners) {
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61 listener.probeTaggedAs(probe, tag);
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62 }
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63 if (tagTrap != null && tag == tagTrap.getTag()) {
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64 probe.setTrap(tagTrap);
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65 }
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66 }
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67 };
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68 }
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69
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70 /**
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71 * Adds a {@link ProbeListener} to receive events.
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72 */
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73 public void addProbeListener(ProbeListener listener) {
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74 assert listener != null;
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75 probeListeners.add(listener);
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76 }
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77
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78 /**
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79 * Removes a {@link ProbeListener}. Ignored if listener not found.
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80 */
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81 public void removeProbeListener(ProbeListener removeListener) {
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82 final List<ProbeListener> listeners = new ArrayList<>(probeListeners);
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83 for (ProbeListener listener : listeners) {
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84 if (listener == removeListener) {
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85 probeListeners.remove(listener);
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86 }
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87 }
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88 }
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89
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90 /**
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91 * Creates a new {@link Probe} associated with a {@link SourceSection} of code corresponding to
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92 * a Truffle AST node.
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93 */
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94 public Probe createProbe(SourceSection source) {
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95 assert source != null;
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96
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97 ProbeImpl probe = InstrumentationNode.createProbe(source, probeCallback);
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98 allProbes.add(probe);
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99
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100 for (ProbeListener listener : probeListeners) {
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101 listener.newProbeInserted(source, probe);
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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 the subset of all {@link Probe}s holding a particular {@link SyntaxTag}, or the whole
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109 * collection if the specified tag is {@code null}.
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110 *
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111 * @return A collection of probes containing the given tag.
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112 */
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113 public Collection<Probe> findProbesTaggedAs(SyntaxTag tag) {
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114 final List<Probe> probes = new ArrayList<>();
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115 for (Probe probe : allProbes) {
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116 if (tag == null || probe.isTaggedAs(tag)) {
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117 probes.add(probe);
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118 }
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119 }
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120 return probes;
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121 }
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122
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123 /**
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124 * Sets the current "tag trap", which will cause a callback to be triggered whenever execution
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125 * reaches a Probe (existing or subsequently created) with the specified tag. There can only be
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126 * one tag trap set at a time.
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127 * <p>
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128 *
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129 * @param tagTrap The {@link SyntaxTagTrap} to set.
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130 * @throws IllegalStateException if a trap is currently set.
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131 */
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132 public void setTagTrap(SyntaxTagTrap tagTrap) throws IllegalStateException {
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133 assert tagTrap != null;
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134 if (this.tagTrap != null) {
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135 throw new IllegalStateException("trap already set");
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136 }
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137 this.tagTrap = tagTrap;
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138
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139 SyntaxTag tag = tagTrap.getTag();
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140 for (ProbeImpl probe : allProbes) {
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141 if (probe.isTaggedAs(tag)) {
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142 probe.setTrap(tagTrap);
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143 }
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144 }
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145 }
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146
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147 /**
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148 * Clears the current {@link SyntaxTagTrap}.
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149 *
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150 * @throws IllegalStateException if no trap is currently set.
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151 */
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152 public void clearTagTrap() {
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153 if (this.tagTrap == null) {
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154 throw new IllegalStateException("no trap set");
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155 }
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156 for (ProbeImpl probe : allProbes) {
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157 if (probe.isTaggedAs(tagTrap.getTag())) {
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158 probe.setTrap(null);
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159 }
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160 }
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161 tagTrap = null;
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162 }
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163
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164 }