Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeNode.java @ 19488:2f676c3ca430
Truffle/Instrumentation: fix some optimization bugs; instrumentation PE tests now succeed after recent compiler work
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 16:07:09 -0800 |
parents | 128586040207 |
children | 745ecef4c9cd |
rev | line source |
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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
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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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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
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6 * under the terms of the GNU General Public License version 2 only, as |
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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
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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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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
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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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Truffle Instrumentation: major API revision, based around the Probe and Instrument classes; add Instrumentable API for language implementors, with most details automated; reimplemented to handle AST splitting automatically; more JUnit tests.
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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.*; |
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28 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal; |
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29 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary; |
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30 import com.oracle.truffle.api.frame.*; |
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31 import com.oracle.truffle.api.instrument.Instrument.InstrumentNode; |
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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 TruffleEventListener, 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 TruffleEventListener execution events} will be reported through the |
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89 * 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(TruffleEventListener) "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, TruffleEventListener eventListener) { |
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124 final ProbeLiteNode probeLiteNode = new ProbeLiteNode(eventListener); |
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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 InstrumentNode} 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 InstrumentNode} node in chain; {@code null} of no instruments in chain. |
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173 */ |
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174 @Child protected InstrumentNode firstInstrument; |
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175 |
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176 // Never changed once set. |
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177 @CompilationFinal private Probe probe = null; |
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178 |
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179 /** |
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180 * An assumption that the state of the {@link Probe} with which this chain is associated has |
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181 * not changed since the last time checking such an assumption failed and a reference to a |
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182 * new assumption (associated with a new state of the {@link Probe} was retrieved. |
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183 */ |
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184 @CompilationFinal private Assumption probeUnchangedAssumption; |
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185 |
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186 private ProbeFullNode() { |
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187 this.firstInstrument = null; |
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188 } |
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189 |
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190 @Override |
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191 public Probe getProbe() throws IllegalStateException { |
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192 return probe; |
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193 } |
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194 |
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195 @Override |
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196 public Node copy() { |
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197 Node node = super.copy(); |
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198 probe.registerProbeNodeClone((ProbeNode) node); |
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199 return node; |
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200 } |
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201 |
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202 private void setProbe(Probe probe) { |
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203 this.probe = probe; |
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204 this.probeUnchangedAssumption = probe.getUnchangedAssumption(); |
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205 } |
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206 |
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207 private void checkProbeUnchangedAssumption() { |
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208 try { |
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209 probeUnchangedAssumption.check(); |
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210 } catch (InvalidAssumptionException ex) { |
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211 // Failure creates an implicit deoptimization |
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212 // Get the assumption associated with the new probe state |
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213 this.probeUnchangedAssumption = probe.getUnchangedAssumption(); |
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214 } |
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215 } |
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216 |
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217 @Override |
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218 @TruffleBoundary |
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219 void addInstrument(Instrument instrument) { |
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220 assert instrument.getProbe() == probe; |
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221 // The existing chain of nodes may be empty |
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222 // Attach the modified chain. |
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223 firstInstrument = insert(instrument.addToChain(firstInstrument)); |
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224 } |
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225 |
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226 @Override |
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227 @TruffleBoundary |
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228 void removeInstrument(Instrument instrument) { |
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229 assert instrument.getProbe() == probe; |
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230 final InstrumentNode modifiedChain = instrument.removeFromChain(firstInstrument); |
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231 if (modifiedChain == null) { |
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232 firstInstrument = null; |
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233 } else { |
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234 firstInstrument = insert(modifiedChain); |
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235 } |
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236 } |
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237 |
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238 public void enter(Node node, VirtualFrame frame) { |
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239 final SyntaxTagTrap trap = probe.getTrap(); |
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240 if (trap != null) { |
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241 checkProbeUnchangedAssumption(); |
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242 trap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), frame.materialize()); |
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243 } |
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244 if (firstInstrument != null) { |
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245 checkProbeUnchangedAssumption(); |
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246 firstInstrument.enter(node, frame); |
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247 } |
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248 } |
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249 |
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250 public void returnVoid(Node node, VirtualFrame frame) { |
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251 if (firstInstrument != null) { |
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252 checkProbeUnchangedAssumption(); |
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253 firstInstrument.returnVoid(node, frame); |
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254 } |
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255 } |
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256 |
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257 public void returnValue(Node node, VirtualFrame frame, Object result) { |
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258 if (firstInstrument != null) { |
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259 checkProbeUnchangedAssumption(); |
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260 firstInstrument.returnValue(node, frame, result); |
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261 } |
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262 } |
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263 |
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264 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) { |
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265 if (firstInstrument != null) { |
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266 checkProbeUnchangedAssumption(); |
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267 firstInstrument.returnExceptional(node, frame, exception); |
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268 } |
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269 } |
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270 |
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271 public String instrumentationInfo() { |
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272 return "Standard probe"; |
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273 } |
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274 |
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275 } |
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276 |
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277 /** |
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278 * Implementation of a probe that only ever has a single "instrument" associated with it. No |
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279 * {@link Instrument} is ever created; instead this method simply delegates the various enter |
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280 * and return events to a {@link TruffleEventListener} passed in during construction. |
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281 */ |
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282 @NodeInfo(cost = NodeCost.NONE) |
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283 private static final class ProbeLiteNode extends ProbeNode { |
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284 |
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285 private final TruffleEventListener eventListener; |
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286 |
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287 private ProbeLiteNode(TruffleEventListener eventListener) { |
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288 this.eventListener = eventListener; |
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289 } |
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290 |
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291 @Override |
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292 public Probe getProbe() throws IllegalStateException { |
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293 throw new IllegalStateException("\"lite-Probed\" nodes have no explicit Probe"); |
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294 } |
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295 |
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296 @Override |
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297 @TruffleBoundary |
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298 void addInstrument(Instrument instrument) { |
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299 throw new IllegalStateException("Instruments may not be added at a \"lite-probed\" location"); |
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300 } |
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301 |
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302 @Override |
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303 @TruffleBoundary |
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304 void removeInstrument(Instrument instrument) { |
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305 throw new IllegalStateException("Instruments may not be removed at a \"lite-probed\" location"); |
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306 } |
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307 |
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308 public void enter(Node node, VirtualFrame frame) { |
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309 eventListener.enter(node, frame); |
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311 |
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312 public void returnVoid(Node node, VirtualFrame frame) { |
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313 eventListener.returnVoid(node, frame); |
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314 } |
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316 public void returnValue(Node node, VirtualFrame frame, Object result) { |
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317 eventListener.returnValue(node, frame, result); |
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318 } |
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320 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) { |
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321 eventListener.returnExceptional(node, frame, exception); |
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322 } |
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323 |
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324 public String instrumentationInfo() { |
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325 return "\"Lite\" probe"; |
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326 } |
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328 } |
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329 } |