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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeNode.java @ 22255:e7643754d982

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Truffle/Instrumentation: rename Instrument to ProbeInstrument to distinguish from another kind to be added.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Fri, 25 Sep 2015 14:58:35 -0700
parents 68a0c3dcea10
children 75e5db92973a
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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.VirtualFrame;
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30 import com.oracle.truffle.api.instrument.ProbeInstrument.AbstractInstrumentNode;
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31 import com.oracle.truffle.api.nodes.Node;
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32 import com.oracle.truffle.api.nodes.NodeCost;
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33 import com.oracle.truffle.api.nodes.NodeInfo;
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34
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35 /**
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36 * Implementation class & interface for enabling the attachment of {@linkplain Probe Probes} to
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37 * Truffle ASTs.
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38 * <p>
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39 * A {@link ProbeNode} is the head of a chain of nodes acting on behalf of {@linkplain ProbeInstrument
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40 * instruments}. It is attached to an AST as a child of a guest-language-specific
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41 * {@link WrapperNode} node.
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42 * <p>
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43 * When Truffle clones an AST, the chain, including all attached {@linkplain ProbeInstrument instruments}
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44 * will be cloned along with the {@link WrapperNode} to which it is attached. An instance of
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45 * {@link Probe} represents abstractly the instrumentation at a particular location in a Guest
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46 * Language AST, tracks the clones of the chain, and keeps the instrumentation attached to the
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47 * clones consistent.
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48 */
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49 @NodeInfo(cost = NodeCost.NONE)
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50 final class ProbeNode extends EventHandlerNode {
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51
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52 // Never changed once set.
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53 @CompilationFinal Probe probe = null;
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54 /**
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55 * First {@link AbstractInstrumentNode} node in chain; {@code null} of no instruments in chain.
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56 */
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57 @Child protected AbstractInstrumentNode firstInstrumentNode;
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58
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59 @Override
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60 public Node copy() {
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61 Node node = super.copy();
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62 probe.registerProbeNodeClone((ProbeNode) node);
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63 return node;
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64 }
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65
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66 /**
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67 * @return the {@link Probe} permanently associated with this {@link ProbeNode}.
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68 */
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69 @Override
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70 public Probe getProbe() {
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71 return probe;
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72 }
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73
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74 @Override
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75 public void enter(Node node, VirtualFrame vFrame) {
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76 this.probe.checkProbeUnchanged();
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77 final SyntaxTagTrap beforeTagTrap = probe.getBeforeTrap();
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78 if (beforeTagTrap != null) {
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79 beforeTagTrap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize());
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80 }
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81 if (firstInstrumentNode != null) {
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82 firstInstrumentNode.enter(node, vFrame);
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83 }
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84 }
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85
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86 @Override
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87 public void returnVoid(Node node, VirtualFrame vFrame) {
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88 this.probe.checkProbeUnchanged();
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89 if (firstInstrumentNode != null) {
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90 firstInstrumentNode.returnVoid(node, vFrame);
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91 }
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92 final SyntaxTagTrap afterTagTrap = probe.getAfterTrap();
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93 if (afterTagTrap != null) {
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94 afterTagTrap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize());
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95 }
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96 }
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97
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98 @Override
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99 public void returnValue(Node node, VirtualFrame vFrame, Object result) {
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100 this.probe.checkProbeUnchanged();
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101 if (firstInstrumentNode != null) {
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102 firstInstrumentNode.returnValue(node, vFrame, result);
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103 }
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104 final SyntaxTagTrap afterTagTrap = probe.getAfterTrap();
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105 if (afterTagTrap != null) {
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106 afterTagTrap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize());
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107 }
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108 }
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109
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110 @Override
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111 public void returnExceptional(Node node, VirtualFrame vFrame, Exception exception) {
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112 this.probe.checkProbeUnchanged();
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113 if (firstInstrumentNode != null) {
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114 firstInstrumentNode.returnExceptional(node, vFrame, exception);
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115 }
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116 final SyntaxTagTrap afterTagTrap = probe.getAfterTrap();
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117 if (afterTagTrap != null) {
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118 afterTagTrap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize());
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119 }
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120 }
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121
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122 @Override
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123 public String instrumentationInfo() {
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124 return "Standard probe";
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125 }
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126
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127 /**
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128 * Gets the guest-language AST node to which this Probe is attached.
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129 */
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130 Node getProbedNode() {
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131 return ((WrapperNode) this.getParent()).getChild();
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132 }
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133
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134 /**
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135 * Adds an {@link AbstractInstrumentNode} to this chain.
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136 */
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137 @TruffleBoundary
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138 void addInstrument(ProbeInstrument instrument) {
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139 assert instrument.getProbe() == probe;
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140 // The existing chain of nodes may be empty
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141 // Attach the modified chain.
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142 firstInstrumentNode = insert(instrument.addToChain(firstInstrumentNode));
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143 }
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144
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145 /**
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146 * Removes an instrument from this chain of instruments.
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147 *
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148 * @throws RuntimeException if no matching instrument is found,
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149 */
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150 @TruffleBoundary
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151 void removeInstrument(ProbeInstrument instrument) {
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152 assert instrument.getProbe() == probe;
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153 final AbstractInstrumentNode modifiedChain = instrument.removeFromChain(firstInstrumentNode);
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154 if (modifiedChain == null) {
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155 firstInstrumentNode = null;
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156 } else {
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157 firstInstrumentNode = insert(modifiedChain);
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158 }
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159 }
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160
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161 }