annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/ProbeNode.java @ 18485: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.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Sun, 23 Nov 2014 16:07:23 -0800
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children 867058575979
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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.
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1 /*
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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.
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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 TruffleEventReceiver, InstrumentationNode {
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39
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40 /**
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41 * Any Truffle node implementing this interface can be "instrumented" by installing a
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42 * {@link Probe} that intercepts execution events at the node and routes them to any
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43 * {@link Instrument}s that have been attached to the {@link Probe}. Only one {@link Probe} may
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44 * be installed at each node; subsequent calls return the one already installed.
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45 *
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46 * @see Instrument
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47 */
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48 public interface Instrumentable {
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49
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50 /**
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51 * Enables "instrumentation" of a Guest Language Truffle node, where the node is presumed to
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52 * be part of a well-formed Truffle AST that is not being executed. The AST may be modified
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53 * as a side effect.
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54 * <p>
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55 * This interface is not intended to be visible as part of the API for tools
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56 * (instrumentation clients).
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57 *
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58 * @return a (possibly newly created) {@link Probe} associated with this node.
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59 */
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60 Probe probe();
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61
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62 /**
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63 * Enables a one-time, unchangeable "instrumentation" of a Guest Language Truffle node,
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64 * where the node is presumed to be part of a well-formed Truffle AST that is not being
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65 * executed. The AST may be modified as a side-effect. Unlike {@link #probe()}, once
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66 * {@link #probeLite(TruffleEventReceiver)} is called at a node, no additional probing can
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67 * be added and no additional instrumentation can be attached.
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68 * <p>
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69 * This interface is not intended to be visible as part of the API for tools
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70 * (instrumentation clients).
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71 *
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72 * @param eventReceiver The {@link TruffleEventReceiver} for the single "instrument" being
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73 * attached to this node.
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74 */
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75 void probeLite(TruffleEventReceiver eventReceiver);
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76 }
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77
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78 /**
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79 * A node that can be inserted into a Truffle AST, and which enables <em>instrumentation</em> at
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80 * a particular Guest Language (GL) node.
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81 * <p>
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82 * The implementation must be GL-specific. A wrapper <em>decorates</em> a GL AST node (the
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83 * wrapper's <em>child</em>) by acting as a transparent <em>proxy</em> with respect to the GL's
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84 * execution semantics.
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85 * <p>
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86 * Instrumentation at the wrapped node is implemented by an instance of {@link ProbeNode}
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87 * attached as a second child of the {@link WrapperNode}.
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88 * <p>
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89 * A wrapper is obliged to notify its attached {@link ProbeNode} when execution events occur at
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90 * the wrapped AST node during program execution.
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91 * <p>
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92 * When a GL AST is cloned, the {@link WrapperNode}, its {@link ProbeNode} and any
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93 * {@linkplain Instrument instrumentation} are also cloned; they are in effect part of the GL
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94 * AST. An instance of {@link Probe} represents abstractly the instrumentation at a particular
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95 * location in a GL AST; it tracks all the copies of the Wrapper and attached instrumentation,
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96 * and acts as a single point of access for tools.
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97 * <p>
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98 * This interface is not intended to be visible as part of the API for tools (instrumentation
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99 * clients).
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100 * <p>
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101 * Implementation guidelines:
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102 * <ol>
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103 * <li>Each GL implementation should include a WrapperNode implementation; usually only one is
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104 * needed.</li>
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105 * <li>The wrapper type should descend from the <em>GL-specific node class</em>.</li>
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106 * <li>Must have a field: {@code @Child private <GL>Node child;}</li>
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107 * <li>Must have a field: {@code @Child private ProbeNode probeNode;}</li>
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108 * <li>The wrapper must act as a <em>proxy</em> for its child, which means implementing every
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109 * possible <em>execute-</em> method that gets called on guest language AST node types by their
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110 * parents, and passing along each call to its child.</li>
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111 * <li>Method {@code Probe getProbe()} should be implemented as {@code probeNode.getProbe();}
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112 * <li>Method {@code insertProbe(ProbeNode)} should be implemented as
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113 * {@code this.probeNode=insert(newProbeNode);}</li>
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114 * <li>Most importantly, Wrappers must be implemented so that Truffle optimization will reduce
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115 * their runtime overhead to zero when there are no attached {@link Instrument}s.</li>
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116 * </ol>
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117 * <p>
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118 * <strong>Disclaimer:</strong> experimental interface under development.
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119 *
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120 * @see Instrument
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121 */
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122 public interface WrapperNode extends InstrumentationNode {
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123
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124 /**
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125 * Gets the node being "wrapped", i.e. the AST node for which
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126 * {@linkplain TruffleEventReceiver execution events} will be reported through the
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127 * Instrumentation Framework.
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128 */
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129 Node getChild();
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130
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131 /**
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132 * Gets the {@link Probe} responsible for installing this wrapper; none if the wrapper
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133 * installed via {@linkplain Instrumentable#probeLite(TruffleEventReceiver) "lite-Probing"}.
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134 */
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135 Probe getProbe();
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136
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137 /**
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138 * Implementation support for completing a newly created wrapper node.
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139 */
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140 void insertProbe(ProbeNode probeNode);
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141
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142 }
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143
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144 /**
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145 * Create a new {@link Probe} associated with, and attached to, a Guest Language specific
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146 * instance of {@link WrapperNode}.
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147 */
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148 public static Probe insertProbe(WrapperNode wrapper) {
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149 final SourceSection sourceSection = wrapper.getChild().getSourceSection();
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150 final ProbeFullNode probeFullNode = new ProbeFullNode(); // private constructor
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151 final Probe probe = new Probe(probeFullNode, sourceSection); // package private access
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152 probeFullNode.setProbe(probe);
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153 wrapper.insertProbe(probeFullNode);
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154 return probe;
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155 }
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156
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157 /**
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158 * Creates a new {@link ProbeLiteNode} associated with, and attached to, a Guest Language
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159 * specific instance of {@link WrapperNode}.
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160 */
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161 public static void insertProbeLite(WrapperNode wrapper, TruffleEventReceiver eventReceiver) {
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162 final ProbeLiteNode probeLiteNode = new ProbeLiteNode(eventReceiver);
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163 wrapper.insertProbe(probeLiteNode);
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164 }
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165
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166 /**
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167 * @return the {@link Probe} permanently associated with this {@link ProbeNode}.
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168 *
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169 * @throws IllegalStateException if this location was "lite-Probed"
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170 */
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171 public abstract Probe getProbe() throws IllegalStateException;
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172
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173 /**
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174 * Adds an {@link InstrumentNode} to this chain.
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175 *
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176 * @throws IllegalStateException if at a "lite-Probed" location.
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177 */
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178 abstract void addInstrument(Instrument instrument);
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179
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180 /**
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181 * Removes an instrument from this chain of instruments.
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182 *
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183 * @throws IllegalStateException if at a "lite-Probed" location.
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184 * @throws RuntimeException if no matching instrument is found,
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185 */
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186 abstract void removeInstrument(Instrument instrument);
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187
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188 /**
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189 * Implementation class & interfaces for enabling the attachment of {@linkplain Probe Probes} to
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190 * Truffle ASTs.
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191 * <p>
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192 * Head of a chain of nodes acting on behalf of {@linkplain Instrument instruments}, attached to
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193 * a Guest Language (GL) AST as a child of a GL-specific {@link WrapperNode} node.
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194 * <p>
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195 * When Truffle clones an AST, the chain, including all attached {@linkplain Instrument
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196 * instruments} will be cloned along with the {@link WrapperNode} to which it is attached. An
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197 * instance of {@link Probe} represents abstractly the instrumentation at a particular location
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198 * in a GL AST, tracks the clones of the chain, and keeps the instrumentation attached to the
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199 * clones consistent.
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200 */
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201 @NodeInfo(cost = NodeCost.NONE)
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202 private static final class ProbeFullNode extends ProbeNode {
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203
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204 /**
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205 * First {@link InstrumentNode} node in chain; {@code null} of no instruments in chain.
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206 */
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207 @Child protected InstrumentNode firstInstrument;
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208
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209 // Never changed once set.
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210 @CompilationFinal private Probe probe = null;
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211
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212 /**
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213 * An assumption that the state of the {@link Probe} with which this chain is associated has
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214 * not changed since the last time checking such an assumption failed and a reference to a
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215 * new assumption (associated with a new state of the {@link Probe} was retrieved.
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216 */
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217 private Assumption probeUnchangedAssumption;
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218
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219 private ProbeFullNode() {
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220 this.firstInstrument = null;
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221 }
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222
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223 @Override
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224 public Probe getProbe() throws IllegalStateException {
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225 return probe;
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226 }
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227
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228 @Override
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229 public Node copy() {
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230 Node node = super.copy();
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231 probe.registerProbeNodeClone((ProbeNode) node);
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232 return node;
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233 }
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234
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235 private void setProbe(Probe probe) {
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236 this.probe = probe;
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237 this.probeUnchangedAssumption = probe.getUnchangedAssumption();
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238 }
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239
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240 private void checkProbeUnchangedAssumption() {
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241 try {
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242 probeUnchangedAssumption.check();
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243 } catch (InvalidAssumptionException ex) {
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244 // Failure creates an implicit deoptimization
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245 // Get the assumption associated with the new probe state
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246 this.probeUnchangedAssumption = probe.getUnchangedAssumption();
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247 }
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248 }
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249
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250 @Override
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251 @TruffleBoundary
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252 void addInstrument(Instrument instrument) {
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253 assert instrument.getProbe() == probe;
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254 // The existing chain of nodes may be empty
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255 // Attach the modified chain.
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256 firstInstrument = insert(instrument.addToChain(firstInstrument));
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257 }
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258
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259 @Override
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260 @TruffleBoundary
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261 void removeInstrument(Instrument instrument) {
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262 assert instrument.getProbe() == probe;
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263 final InstrumentNode modifiedChain = instrument.removeFromChain(firstInstrument);
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264 if (modifiedChain == null) {
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265 firstInstrument = null;
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266 } else {
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267 firstInstrument = insert(modifiedChain);
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268 }
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269 }
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270
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271 public void enter(Node node, VirtualFrame frame) {
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272 final SyntaxTagTrap trap = probe.getTrap();
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273 if (trap != null) {
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274 checkProbeUnchangedAssumption();
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275 trap.tagTrappedAt(((WrapperNode) this.getParent()).getChild(), frame.materialize());
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276 }
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277 if (firstInstrument != null) {
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278 checkProbeUnchangedAssumption();
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279 firstInstrument.enter(node, frame);
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280 }
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281 }
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282
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283 public void returnVoid(Node node, VirtualFrame frame) {
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284 if (firstInstrument != null) {
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285 checkProbeUnchangedAssumption();
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286 firstInstrument.returnVoid(node, frame);
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287 }
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288 }
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289
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290 public void returnValue(Node node, VirtualFrame frame, Object result) {
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291 if (firstInstrument != null) {
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292 checkProbeUnchangedAssumption();
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293 firstInstrument.returnValue(node, frame, result);
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294 }
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295 }
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296
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297 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) {
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298 if (firstInstrument != null) {
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299 checkProbeUnchangedAssumption();
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300 firstInstrument.returnExceptional(node, frame, exception);
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301 }
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302 }
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303
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304 public String instrumentationInfo() {
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305 return "Standard probe";
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306 }
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307
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308 }
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309
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310 /**
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311 * Implementation of a probe that only ever has a single "instrument" associated with it. No
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312 * {@link Instrument} is ever created; instead this method simply delegates the various enter
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313 * and return events to a {@link TruffleEventReceiver} passed in during construction.
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314 */
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315 @NodeInfo(cost = NodeCost.NONE)
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316 private static final class ProbeLiteNode extends ProbeNode {
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317
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318 private final TruffleEventReceiver eventReceiver;
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319
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320 private ProbeLiteNode(TruffleEventReceiver eventReceiver) {
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321 this.eventReceiver = eventReceiver;
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322 }
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323
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324 @Override
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325 public Probe getProbe() throws IllegalStateException {
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326 throw new IllegalStateException("\"lite-Probed\" nodes have no explicit Probe");
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327 }
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328
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329 @Override
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330 @TruffleBoundary
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331 void addInstrument(Instrument instrument) {
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332 throw new IllegalStateException("Instruments may not be added at a \"lite-probed\" location");
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333 }
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334
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335 @Override
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336 @TruffleBoundary
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337 void removeInstrument(Instrument instrument) {
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338 throw new IllegalStateException("Instruments may not be removed at a \"lite-probed\" location");
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339 }
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340
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341 public void enter(Node node, VirtualFrame frame) {
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342 eventReceiver.enter(node, frame);
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343 }
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344
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345 public void returnVoid(Node node, VirtualFrame frame) {
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346 eventReceiver.returnVoid(node, frame);
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347 }
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348
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349 public void returnValue(Node node, VirtualFrame frame, Object result) {
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350 eventReceiver.returnValue(node, frame, result);
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351 }
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352
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353 public void returnExceptional(Node node, VirtualFrame frame, Exception exception) {
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354 eventReceiver.returnExceptional(node, frame, exception);
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355 }
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356
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357 public String instrumentationInfo() {
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358 return "\"Lite\" probe";
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359 }
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360
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361 }
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362 }