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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeNode.java @ 19818:907128d02b31

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Truffle/Instrumentation: For clients of Instrumentation, replace the TruffleEventListener interface with two: InstrumentListener, and ASTInstrumentListener. The former is simple, completely Truffle-safe (can't affect Truffle execution), and designed for simple tools. The latter is similar to the previous interface.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Thu, 12 Mar 2015 18:03:05 -0700
parents 745ecef4c9cd
children 1d6a7ea5de59
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1 /*
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2 * Copyright (c) 2013, 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.instrument;
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26
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27 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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28 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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29 import com.oracle.truffle.api.frame.*;
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30 import com.oracle.truffle.api.instrument.Instrument.AbstractInstrumentNode;
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31 import com.oracle.truffle.api.instrument.InstrumentationNode.TruffleEvents;
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32 import com.oracle.truffle.api.nodes.*;
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33 import com.oracle.truffle.api.source.*;
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34
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35 /**
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36 * Implementation interfaces and classes for attaching {@link Probe}s to {@link WrapperNode}s.
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37 */
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38 public abstract class ProbeNode extends Node implements TruffleEvents, InstrumentationNode {
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39
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40 /**
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41 * A node that can be inserted into a Truffle AST, and which enables {@linkplain Instrument
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42 * instrumentation} at a particular Guest Language (GL) node. Implementations must extend
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43 * {@link Node} and should override {@link Node#isInstrumentable()} to return {@code false}.
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44 * <p>
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45 * The implementation must be GL-specific. A wrapper <em>decorates</em> a GL AST node (the
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46 * wrapper's <em>child</em>) by acting as a transparent <em>proxy</em> with respect to the GL's
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47 * execution semantics.
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48 * <p>
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49 * Instrumentation at the wrapped node is implemented by an instance of {@link ProbeNode}
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50 * attached as a second child of the {@link WrapperNode}.
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51 * <p>
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52 * A wrapper is obliged to notify its attached {@link ProbeNode} when execution events occur at
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53 * the wrapped AST node during program execution.
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54 * <p>
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55 * When a GL AST is cloned, the {@link WrapperNode}, its {@link ProbeNode} and any
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56 * {@linkplain Instrument instrumentation} are also cloned; they are in effect part of the GL
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57 * AST. An instance of {@link Probe} represents abstractly the instrumentation at a particular
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58 * location in a GL AST; it tracks all the copies of the Wrapper and attached instrumentation,
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59 * and acts as a single point of access for tools.
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60 * <p>
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61 * This interface is not intended to be visible as part of the API for tools (instrumentation
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62 * clients).
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63 * <p>
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64 * Implementation guidelines:
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65 * <ol>
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66 * <li>Each GL implementation should include a WrapperNode implementation; usually only one is
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67 * needed.</li>
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68 * <li>The wrapper type should descend from the <em>GL-specific node class</em>.</li>
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69 * <li>Must have a field: {@code @Child private <GL>Node child;}</li>
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70 * <li>Must have a field: {@code @Child private ProbeNode probeNode;}</li>
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71 * <li>The wrapper must act as a <em>proxy</em> for its child, which means implementing every
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72 * possible <em>execute-</em> method that gets called on guest language AST node types by their
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73 * parents, and passing along each call to its child.</li>
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74 * <li>Method {@code Probe getProbe()} should be implemented as {@code probeNode.getProbe();}
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75 * <li>Method {@code insertProbe(ProbeNode)} should be implemented as
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76 * {@code this.probeNode=insert(newProbeNode);}</li>
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77 * <li>Most importantly, Wrappers must be implemented so that Truffle optimization will reduce
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78 * their runtime overhead to zero when there are no attached {@link Instrument}s.</li>
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79 * </ol>
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80 * <p>
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81 *
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82 * @see Instrument
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83 */
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84 public interface WrapperNode extends InstrumentationNode {
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85
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86 /**
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87 * Gets the node being "wrapped", i.e. the AST node for which
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88 * {@linkplain InstrumentationNode.TruffleEvents execution events} will be reported through
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89 * the Instrumentation Framework.
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90 */
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91 Node getChild();
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92
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93 /**
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94 * Gets the {@link Probe} responsible for installing this wrapper; none if the wrapper
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95 * installed via {@linkplain Node#probeLite(ASTInstrumentListener) "lite-Probing"}.
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96 */
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97 Probe getProbe();
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98
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99 /**
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100 * Implementation support for completing a newly created wrapper node.
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101 */
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102 void insertProbe(ProbeNode probeNode);
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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 * Create a new {@link Probe} associated with, and attached to, a Guest Language specific
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108 * instance of {@link WrapperNode}.
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109 */
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110 public static Probe insertProbe(WrapperNode wrapper) {
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111 final SourceSection sourceSection = wrapper.getChild().getSourceSection();
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112 final ProbeFullNode probeFullNode = new ProbeFullNode(); // private constructor
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113 final Probe probe = new Probe(probeFullNode, sourceSection); // package private access
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114 probeFullNode.setProbe(probe);
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115 wrapper.insertProbe(probeFullNode);
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116 return probe;
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117 }
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118
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119 /**
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120 * Creates a new {@link ProbeLiteNode} associated with, and attached to, a Guest Language
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121 * specific instance of {@link WrapperNode}.
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122 */
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123 public static void insertProbeLite(WrapperNode wrapper, ASTInstrumentListener instrumentListener) {
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124 final ProbeLiteNode probeLiteNode = new ProbeLiteNode(instrumentListener);
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125 wrapper.insertProbe(probeLiteNode);
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126 }
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127
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128 @Override
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129 public boolean isInstrumentable() {
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130 return false;
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131 }
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132
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133 /**
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134 * @return the {@link Probe} permanently associated with this {@link ProbeNode}.
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135 *
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136 * @throws IllegalStateException if this location was "lite-Probed"
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137 */
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138 public abstract Probe getProbe() throws IllegalStateException;
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139
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140 /**
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141 * Adds an {@link AbstractInstrumentNode} to this chain.
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142 *
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143 * @throws IllegalStateException if at a "lite-Probed" location.
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144 */
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145 abstract void addInstrument(Instrument instrument);
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146
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147 /**
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148 * Removes an instrument from this chain of instruments.
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149 *
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150 * @throws IllegalStateException if at a "lite-Probed" location.
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151 * @throws RuntimeException if no matching instrument is found,
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152 */
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153 abstract void removeInstrument(Instrument instrument);
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154
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155 /**
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156 * Implementation class & interfaces for enabling the attachment of {@linkplain Probe Probes} to
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157 * Truffle ASTs.
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158 * <p>
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159 * Head of a chain of nodes acting on behalf of {@linkplain Instrument instruments}, attached to
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160 * a Guest Language (GL) AST as a child of a GL-specific {@link WrapperNode} node.
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161 * <p>
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162 * When Truffle clones an AST, the chain, including all attached {@linkplain Instrument
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163 * instruments} will be cloned along with the {@link WrapperNode} to which it is attached. An
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164 * instance of {@link Probe} represents abstractly the instrumentation at a particular location
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165 * in a GL AST, tracks the clones of the chain, and keeps the instrumentation attached to the
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166 * clones consistent.
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167 */
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168 @NodeInfo(cost = NodeCost.NONE)
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169 private static final class ProbeFullNode extends ProbeNode {
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170
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171 /**
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172 * First {@link AbstractInstrumentNode} node in chain; {@code null} of no instruments in
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173 * chain.
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174 */
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175 @Child protected AbstractInstrumentNode firstInstrument;
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176
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177 // Never changed once set.
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178 @CompilationFinal private Probe probe = null;
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179
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180 private ProbeFullNode() {
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181 this.firstInstrument = null;
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182 }
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183
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184 @Override
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185 public Probe getProbe() throws IllegalStateException {
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186 return probe;
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187 }
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188
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189 @Override
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190 public Node copy() {
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191 Node node = super.copy();
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192 probe.registerProbeNodeClone((ProbeNode) node);
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193 return node;
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194 }
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195
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196 private void setProbe(Probe probe) {
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197 this.probe = probe;
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198 }
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199
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200 @Override
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201 @TruffleBoundary
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202 void addInstrument(Instrument instrument) {
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203 assert instrument.getProbe() == probe;
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204 // The existing chain of nodes may be empty
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205 // Attach the modified chain.
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206 firstInstrument = insert(instrument.addToChain(firstInstrument));
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207 }
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208
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209 @Override
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210 @TruffleBoundary
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211 void removeInstrument(Instrument instrument) {
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212 assert instrument.getProbe() == probe;
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213 final AbstractInstrumentNode modifiedChain = instrument.removeFromChain(firstInstrument);
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214 if (modifiedChain == null) {
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215 firstInstrument = null;
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216 } else {
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217 firstInstrument = insert(modifiedChain);
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218 }
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219 }
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220
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221 public void enter(Node node, VirtualFrame vFrame) {
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222 this.probe.checkProbeUnchanged();
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223 final SyntaxTagTrap trap = probe.getTrap();
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224 if (trap != null) {
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225 trap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize());
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226 }
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227 if (firstInstrument != null) {
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228 firstInstrument.enter(node, vFrame);
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229 }
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230 }
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231
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232 public void returnVoid(Node node, VirtualFrame vFrame) {
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233 this.probe.checkProbeUnchanged();
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234 if (firstInstrument != null) {
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235 firstInstrument.returnVoid(node, vFrame);
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236 }
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237 }
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238
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239 public void returnValue(Node node, VirtualFrame vFrame, Object result) {
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240 this.probe.checkProbeUnchanged();
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241 if (firstInstrument != null) {
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242 firstInstrument.returnValue(node, vFrame, result);
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243 }
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244 }
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245
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246 public void returnExceptional(Node node, VirtualFrame vFrame, Exception exception) {
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247 this.probe.checkProbeUnchanged();
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248 if (firstInstrument != null) {
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249 firstInstrument.returnExceptional(node, vFrame, exception);
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250 }
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251 }
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252
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253 public String instrumentationInfo() {
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254 return "Standard probe";
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255 }
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256 }
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257
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258 /**
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259 * Implementation of a probe that only ever has a single "instrument" associated with it. No
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260 * {@link Instrument} is ever created; instead this method simply delegates the various enter
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261 * and return events to a {@link TruffleEvents} passed in during construction.
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262 */
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263 @NodeInfo(cost = NodeCost.NONE)
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264 private static final class ProbeLiteNode extends ProbeNode {
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265
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266 private final ASTInstrumentListener instrumentListener;
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267
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268 private ProbeLiteNode(ASTInstrumentListener eventListener) {
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269 this.instrumentListener = eventListener;
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270 }
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271
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272 @Override
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273 public Probe getProbe() throws IllegalStateException {
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274 throw new IllegalStateException("\"lite-Probed\" nodes have no explicit Probe");
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275 }
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276
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277 @Override
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278 @TruffleBoundary
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279 void addInstrument(Instrument instrument) {
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280 throw new IllegalStateException("Instruments may not be added at a \"lite-probed\" location");
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281 }
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282
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283 @Override
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284 @TruffleBoundary
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285 void removeInstrument(Instrument instrument) {
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286 throw new IllegalStateException("Instruments may not be removed at a \"lite-probed\" location");
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287 }
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288
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289 public void enter(Node node, VirtualFrame vFrame) {
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290 instrumentListener.enter(getProbe(), node, vFrame);
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291 }
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292
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293 public void returnVoid(Node node, VirtualFrame vFrame) {
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294 instrumentListener.returnVoid(getProbe(), node, vFrame);
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295 }
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296
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297 public void returnValue(Node node, VirtualFrame vFrame, Object result) {
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298 instrumentListener.returnValue(getProbe(), node, vFrame, result);
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299 }
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300
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301 public void returnExceptional(Node node, VirtualFrame vFrame, Exception exception) {
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302 instrumentListener.returnExceptional(getProbe(), node, vFrame, exception);
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303 }
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304
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305 public String instrumentationInfo() {
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306 return "\"Lite\" probe";
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307 }
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308
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309 }
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310 }