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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeNode.java @ 19490:745ecef4c9cd
Truffle/Instrumentation: clean up the use of Assumptions in the Probe (and attached Instruments)
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Wed, 18 Feb 2015 18:07:48 -0800 |
parents | 2f676c3ca430 |
children | 907128d02b31 |
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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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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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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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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15 * accompanied this code). |
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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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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.InstrumentNode; |
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31 import com.oracle.truffle.api.nodes.*; |
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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 * Implementation interfaces and classes for attaching {@link Probe}s to {@link WrapperNode}s. |
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36 */ |
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37 public abstract class ProbeNode extends Node implements TruffleEventListener, InstrumentationNode { |
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38 |
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39 /** |
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40 * A node that can be inserted into a Truffle AST, and which enables {@linkplain Instrument |
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41 * instrumentation} at a particular Guest Language (GL) node. Implementations must extend |
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42 * {@link Node} and should override {@link Node#isInstrumentable()} to return {@code false}. |
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43 * <p> |
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44 * The implementation must be GL-specific. A wrapper <em>decorates</em> a GL AST node (the |
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45 * wrapper's <em>child</em>) by acting as a transparent <em>proxy</em> with respect to the GL's |
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46 * execution semantics. |
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47 * <p> |
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48 * Instrumentation at the wrapped node is implemented by an instance of {@link ProbeNode} |
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49 * attached as a second child of the {@link WrapperNode}. |
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50 * <p> |
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51 * A wrapper is obliged to notify its attached {@link ProbeNode} when execution events occur at |
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52 * the wrapped AST node during program execution. |
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53 * <p> |
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54 * When a GL AST is cloned, the {@link WrapperNode}, its {@link ProbeNode} and any |
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55 * {@linkplain Instrument instrumentation} are also cloned; they are in effect part of the GL |
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56 * AST. An instance of {@link Probe} represents abstractly the instrumentation at a particular |
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57 * location in a GL AST; it tracks all the copies of the Wrapper and attached instrumentation, |
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58 * and acts as a single point of access for tools. |
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59 * <p> |
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60 * This interface is not intended to be visible as part of the API for tools (instrumentation |
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61 * clients). |
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62 * <p> |
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63 * Implementation guidelines: |
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64 * <ol> |
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65 * <li>Each GL implementation should include a WrapperNode implementation; usually only one is |
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66 * needed.</li> |
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67 * <li>The wrapper type should descend from the <em>GL-specific node class</em>.</li> |
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68 * <li>Must have a field: {@code @Child private <GL>Node child;}</li> |
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69 * <li>Must have a field: {@code @Child private ProbeNode probeNode;}</li> |
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70 * <li>The wrapper must act as a <em>proxy</em> for its child, which means implementing every |
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71 * possible <em>execute-</em> method that gets called on guest language AST node types by their |
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72 * parents, and passing along each call to its child.</li> |
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73 * <li>Method {@code Probe getProbe()} should be implemented as {@code probeNode.getProbe();} |
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74 * <li>Method {@code insertProbe(ProbeNode)} should be implemented as |
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75 * {@code this.probeNode=insert(newProbeNode);}</li> |
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76 * <li>Most importantly, Wrappers must be implemented so that Truffle optimization will reduce |
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77 * their runtime overhead to zero when there are no attached {@link Instrument}s.</li> |
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78 * </ol> |
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79 * <p> |
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80 * |
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81 * @see Instrument |
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82 */ |
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83 public interface WrapperNode extends InstrumentationNode { |
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84 |
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85 /** |
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86 * Gets the node being "wrapped", i.e. the AST node for which |
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87 * {@linkplain TruffleEventListener execution events} will be reported through the |
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88 * Instrumentation Framework. |
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89 */ |
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90 Node getChild(); |
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91 |
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92 /** |
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93 * Gets the {@link Probe} responsible for installing this wrapper; none if the wrapper |
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94 * installed via {@linkplain Node#probeLite(TruffleEventListener) "lite-Probing"}. |
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95 */ |
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96 Probe getProbe(); |
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97 |
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98 /** |
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99 * Implementation support for completing a newly created wrapper node. |
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100 */ |
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101 void insertProbe(ProbeNode probeNode); |
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102 |
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103 } |
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104 |
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105 /** |
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106 * Create a new {@link Probe} associated with, and attached to, a Guest Language specific |
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107 * instance of {@link WrapperNode}. |
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108 */ |
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109 public static Probe insertProbe(WrapperNode wrapper) { |
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110 final SourceSection sourceSection = wrapper.getChild().getSourceSection(); |
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111 final ProbeFullNode probeFullNode = new ProbeFullNode(); // private constructor |
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112 final Probe probe = new Probe(probeFullNode, sourceSection); // package private access |
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113 probeFullNode.setProbe(probe); |
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114 wrapper.insertProbe(probeFullNode); |
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115 return probe; |
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116 } |
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117 |
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118 /** |
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119 * Creates a new {@link ProbeLiteNode} associated with, and attached to, a Guest Language |
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120 * specific instance of {@link WrapperNode}. |
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121 */ |
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122 public static void insertProbeLite(WrapperNode wrapper, TruffleEventListener eventListener) { |
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123 final ProbeLiteNode probeLiteNode = new ProbeLiteNode(eventListener); |
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124 wrapper.insertProbe(probeLiteNode); |
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125 } |
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126 |
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127 @Override |
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128 public boolean isInstrumentable() { |
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129 return false; |
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130 } |
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131 |
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132 /** |
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133 * @return the {@link Probe} permanently associated with this {@link ProbeNode}. |
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134 * |
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135 * @throws IllegalStateException if this location was "lite-Probed" |
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136 */ |
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137 public abstract Probe getProbe() throws IllegalStateException; |
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138 |
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139 /** |
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140 * Adds an {@link InstrumentNode} to this chain. |
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141 * |
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142 * @throws IllegalStateException if at a "lite-Probed" location. |
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143 */ |
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144 abstract void addInstrument(Instrument instrument); |
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145 |
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146 /** |
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147 * Removes an instrument from this chain of instruments. |
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148 * |
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149 * @throws IllegalStateException if at a "lite-Probed" location. |
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150 * @throws RuntimeException if no matching instrument is found, |
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151 */ |
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152 abstract void removeInstrument(Instrument instrument); |
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153 |
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154 /** |
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155 * Implementation class & interfaces for enabling the attachment of {@linkplain Probe Probes} to |
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156 * Truffle ASTs. |
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157 * <p> |
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158 * Head of a chain of nodes acting on behalf of {@linkplain Instrument instruments}, attached to |
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159 * a Guest Language (GL) AST as a child of a GL-specific {@link WrapperNode} node. |
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160 * <p> |
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161 * When Truffle clones an AST, the chain, including all attached {@linkplain Instrument |
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162 * instruments} will be cloned along with the {@link WrapperNode} to which it is attached. An |
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163 * instance of {@link Probe} represents abstractly the instrumentation at a particular location |
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164 * in a GL AST, tracks the clones of the chain, and keeps the instrumentation attached to the |
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165 * clones consistent. |
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166 */ |
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167 @NodeInfo(cost = NodeCost.NONE) |
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168 private static final class ProbeFullNode extends ProbeNode { |
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169 |
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170 /** |
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171 * First {@link InstrumentNode} node in chain; {@code null} of no instruments in chain. |
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172 */ |
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173 @Child protected InstrumentNode firstInstrument; |
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174 |
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175 // Never changed once set. |
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176 @CompilationFinal private Probe probe = null; |
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177 |
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178 private ProbeFullNode() { |
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179 this.firstInstrument = null; |
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180 } |
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181 |
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182 @Override |
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183 public Probe getProbe() throws IllegalStateException { |
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184 return probe; |
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185 } |
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186 |
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187 @Override |
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188 public Node copy() { |
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189 Node node = super.copy(); |
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190 probe.registerProbeNodeClone((ProbeNode) node); |
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191 return node; |
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192 } |
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193 |
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194 private void setProbe(Probe probe) { |
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195 this.probe = probe; |
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196 } |
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197 |
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198 @Override |
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199 @TruffleBoundary |
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200 void addInstrument(Instrument instrument) { |
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201 assert instrument.getProbe() == probe; |
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202 // The existing chain of nodes may be empty |
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203 // Attach the modified chain. |
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204 firstInstrument = insert(instrument.addToChain(firstInstrument)); |
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205 } |
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206 |
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207 @Override |
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208 @TruffleBoundary |
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209 void removeInstrument(Instrument instrument) { |
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210 assert instrument.getProbe() == probe; |
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211 final InstrumentNode modifiedChain = instrument.removeFromChain(firstInstrument); |
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212 if (modifiedChain == null) { |
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213 firstInstrument = null; |
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214 } else { |
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215 firstInstrument = insert(modifiedChain); |
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216 } |
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217 } |
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218 |
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219 public void enter(Node node, VirtualFrame vFrame) { |
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220 this.probe.checkProbeUnchanged(); |
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221 final SyntaxTagTrap trap = probe.getTrap(); |
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222 if (trap != null) { |
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223 trap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), vFrame.materialize()); |
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224 } |
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225 if (firstInstrument != null) { |
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226 firstInstrument.enter(node, vFrame); |
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227 } |
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228 } |
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229 |
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230 public void returnVoid(Node node, VirtualFrame vFrame) { |
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231 this.probe.checkProbeUnchanged(); |
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232 if (firstInstrument != null) { |
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233 firstInstrument.returnVoid(node, vFrame); |
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234 } |
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235 } |
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236 |
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237 public void returnValue(Node node, VirtualFrame vFrame, Object result) { |
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238 this.probe.checkProbeUnchanged(); |
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239 if (firstInstrument != null) { |
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240 firstInstrument.returnValue(node, vFrame, result); |
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241 } |
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242 } |
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243 |
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244 public void returnExceptional(Node node, VirtualFrame vFrame, Exception exception) { |
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245 this.probe.checkProbeUnchanged(); |
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246 if (firstInstrument != null) { |
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247 firstInstrument.returnExceptional(node, vFrame, exception); |
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248 } |
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249 } |
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250 |
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251 public String instrumentationInfo() { |
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252 return "Standard probe"; |
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253 } |
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254 } |
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255 |
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256 /** |
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257 * Implementation of a probe that only ever has a single "instrument" associated with it. No |
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258 * {@link Instrument} is ever created; instead this method simply delegates the various enter |
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259 * and return events to a {@link TruffleEventListener} passed in during construction. |
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260 */ |
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261 @NodeInfo(cost = NodeCost.NONE) |
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262 private static final class ProbeLiteNode extends ProbeNode { |
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263 |
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264 private final TruffleEventListener eventListener; |
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265 |
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266 private ProbeLiteNode(TruffleEventListener eventListener) { |
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267 this.eventListener = eventListener; |
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268 } |
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269 |
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270 @Override |
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271 public Probe getProbe() throws IllegalStateException { |
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272 throw new IllegalStateException("\"lite-Probed\" nodes have no explicit Probe"); |
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273 } |
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274 |
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275 @Override |
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276 @TruffleBoundary |
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277 void addInstrument(Instrument instrument) { |
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278 throw new IllegalStateException("Instruments may not be added at a \"lite-probed\" location"); |
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279 } |
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280 |
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281 @Override |
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282 @TruffleBoundary |
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283 void removeInstrument(Instrument instrument) { |
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284 throw new IllegalStateException("Instruments may not be removed at a \"lite-probed\" location"); |
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285 } |
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286 |
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287 public void enter(Node node, VirtualFrame vFrame) { |
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288 eventListener.enter(node, vFrame); |
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289 } |
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290 |
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291 public void returnVoid(Node node, VirtualFrame vFrame) { |
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292 eventListener.returnVoid(node, vFrame); |
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293 } |
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294 |
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295 public void returnValue(Node node, VirtualFrame vFrame, Object result) { |
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296 eventListener.returnValue(node, vFrame, result); |
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297 } |
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298 |
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299 public void returnExceptional(Node node, VirtualFrame vFrame, Exception exception) { |
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300 eventListener.returnExceptional(node, vFrame, exception); |
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301 } |
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302 |
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303 public String instrumentationInfo() { |
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304 return "\"Lite\" probe"; |
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305 } |
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306 |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
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307 } |
e3c95cbbb50c
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.
Michael Van De Vanter <michael.van.de.vanter@oracle.com>
parents:
diff
changeset
|
308 } |