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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 17382:e1da729b3e4e

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make Truffle Node source section @CompilationFinal
author Lukas Stadler <lukas.stadler@oracle.com>
date Wed, 08 Oct 2014 10:50:18 +0200
parents f8998c828bed
children 763a34f283f9
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1 /*
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.nodes;
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26
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27 import java.lang.annotation.*;
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28 import java.util.*;
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29 import java.util.concurrent.*;
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30
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31 import com.oracle.truffle.api.*;
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32 import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
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33 import com.oracle.truffle.api.source.*;
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34 import com.oracle.truffle.api.utilities.*;
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35
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36 /**
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37 * Abstract base class for all Truffle nodes.
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38 */
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39 public abstract class Node implements Cloneable {
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40
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41 private Node parent;
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42
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43 @CompilationFinal private SourceSection sourceSection;
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44
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45 /**
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46 * Marks array fields that are children of this node.
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47 */
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48 @Retention(RetentionPolicy.RUNTIME)
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49 @Target({ElementType.FIELD})
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50 public @interface Children {
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51 }
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52
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53 /**
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54 * Marks fields that represent child nodes of this node.
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55 */
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56 @Retention(RetentionPolicy.RUNTIME)
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57 @Target({ElementType.FIELD})
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58 public @interface Child {
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59 }
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60
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61 protected Node() {
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62 this(null);
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63 }
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64
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65 protected Node(SourceSection sourceSection) {
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66 CompilerAsserts.neverPartOfCompilation();
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67 this.sourceSection = sourceSection;
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68 if (TruffleOptions.TraceASTJSON) {
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69 JSONHelper.dumpNewNode(this);
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70 }
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71 }
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72
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73 /**
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74 * Assigns a link to a guest language source section to this node.
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75 *
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76 * @param section the object representing a section in guest language source code
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77 */
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78 public final void assignSourceSection(SourceSection section) {
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79 if (sourceSection != null) {
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80 // Patch this test during the transition to constructor-based
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81 // source attribution, which would otherwise trigger this
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82 // exception. This method will eventually be deprecated.
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83 if (getSourceSection() != section) {
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84 throw new IllegalStateException("Source section is already assigned. Old: " + getSourceSection() + ", new: " + section);
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85 }
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86 }
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87 this.sourceSection = section;
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88 }
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89
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90 /**
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91 * Returns a rough estimate for the cost of this {@link Node}. This estimate can be used by
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92 * runtime systems or guest languages to implement heuristics based on Truffle ASTs. This method
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93 * is intended to be overridden by subclasses. The default implementation returns the value of
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94 * {@link NodeInfo#cost()} of the {@link NodeInfo} annotation declared at the subclass. If no
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95 * {@link NodeInfo} annotation is declared the method returns {@link NodeCost#MONOMORPHIC} as a
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96 * default value.
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97 */
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98 public NodeCost getCost() {
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99 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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100 if (info != null) {
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101 return info.cost();
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102 }
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103 return NodeCost.MONOMORPHIC;
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104 }
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105
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106 /**
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107 * Clears any previously assigned guest language source code from this node.
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108 */
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109 public final void clearSourceSection() {
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110 this.sourceSection = null;
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111 }
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112
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113 /**
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114 * Retrieves the guest language source code section that is currently assigned to this node.
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115 *
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116 * @return the assigned source code section
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117 */
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118 public final SourceSection getSourceSection() {
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119 return sourceSection;
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120 }
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121
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122 /**
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123 * Retrieves the guest language source code section that is currently assigned to this node.
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124 *
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125 * @return the assigned source code section
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126 */
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127 @CompilerDirectives.SlowPath
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128 public final SourceSection getEncapsulatingSourceSection() {
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129 if (sourceSection == null && getParent() != null) {
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130 return getParent().getEncapsulatingSourceSection();
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131 }
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132 return sourceSection;
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133 }
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134
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135 /**
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136 * Method that updates the link to the parent in the array of specified new child nodes to this
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137 * node.
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138 *
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139 * @param newChildren the array of new children whose parent should be updated
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140 * @return the array of new children
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141 */
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142 protected final <T extends Node> T[] insert(final T[] newChildren) {
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143 CompilerDirectives.transferToInterpreterAndInvalidate();
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144 assert newChildren != null;
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145 for (Node newChild : newChildren) {
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146 adoptHelper(newChild);
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147 }
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148 return newChildren;
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149 }
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150
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151 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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152 * Method that updates the link to the parent in the specified new child node to this node.
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153 *
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154 * @param newChild the new child whose parent should be updated
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155 * @return the new child
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156 */
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157 protected final <T extends Node> T insert(final T newChild) {
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158 CompilerDirectives.transferToInterpreterAndInvalidate();
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159 assert newChild != null;
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160 adoptHelper(newChild);
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161 return newChild;
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162 }
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163
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164 public final void adoptChildren() {
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165 CompilerDirectives.transferToInterpreterAndInvalidate();
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166 adoptHelper();
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167 }
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168
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169 private void adoptHelper(final Node newChild) {
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170 assert newChild != null;
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171 if (newChild == this) {
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172 throw new IllegalStateException("The parent of a node can never be the node itself.");
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173 }
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174 boolean isInserted = newChild.parent == null;
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175 newChild.parent = this;
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176 if (TruffleOptions.TraceASTJSON) {
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177 JSONHelper.dumpNewChild(this, newChild);
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178 }
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179 newChild.adoptHelper();
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180 if (isInserted) {
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181 newChild.onAdopt();
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182 }
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183 }
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184
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185 private void adoptHelper() {
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186 Iterable<Node> children = this.getChildren();
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187 for (Node child : children) {
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188 if (child != null && child.getParent() != this) {
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189 this.adoptHelper(child);
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190 }
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191 }
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192 }
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193
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194 private void adoptUnadoptedHelper(final Node newChild) {
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195 assert newChild != null;
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196 if (newChild == this) {
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197 throw new IllegalStateException("The parent of a node can never be the node itself.");
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198 }
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199 boolean isInserted = newChild.parent == null;
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200 newChild.parent = this;
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201 newChild.adoptUnadoptedHelper();
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202 if (isInserted) {
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203 newChild.onAdopt();
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204 }
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205 }
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206
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207 private void adoptUnadoptedHelper() {
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208 Iterable<Node> children = this.getChildren();
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209 for (Node child : children) {
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210 if (child != null && child.getParent() == null) {
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211 this.adoptUnadoptedHelper(child);
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212 }
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213 }
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214 }
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215
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216 /**
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217 * Returns properties of this node interesting for debugging and can be overwritten by
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218 * subclasses to add their own custom properties.
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219 *
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220 * @return the properties as a key/value hash map
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221 */
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222 public Map<String, Object> getDebugProperties() {
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223 Map<String, Object> properties = new HashMap<>();
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224 return properties;
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225 }
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226
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227 /**
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228 * The current parent node of this node.
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229 *
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230 * @return the parent node
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231 */
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232 public final Node getParent() {
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233 return parent;
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234 }
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235
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236 /**
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237 * Replaces this node with another node. If there is a source section (see
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238 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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239 *
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240 * @param newNode the new node that is the replacement
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241 * @param reason a description of the reason for the replacement
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242 * @return the new node
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243 */
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244 public final <T extends Node> T replace(final T newNode, final CharSequence reason) {
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245 CompilerDirectives.transferToInterpreterAndInvalidate();
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246 atomic(new Runnable() {
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247 public void run() {
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248 replaceHelper(newNode, reason);
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249 }
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250 });
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251 return newNode;
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252 }
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253
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254 /**
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255 * Replaces this node with another node. If there is a source section (see
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256 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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257 *
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258 * @param newNode the new node that is the replacement
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259 * @return the new node
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260 */
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261 public final <T extends Node> T replace(T newNode) {
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262 return replace(newNode, "");
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263 }
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264
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265 private void replaceHelper(Node newNode, CharSequence reason) {
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266 CompilerAsserts.neverPartOfCompilation();
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267 if (this.getParent() == null) {
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268 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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269 }
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270 if (sourceSection != null && newNode.getSourceSection() == null) {
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271 // Pass on the source section to the new node.
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272 newNode.assignSourceSection(sourceSection);
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273 }
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274 // (aw) need to set parent *before* replace, so that (unsynchronized) getRootNode()
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275 // will always find the root node
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276 newNode.parent = this.parent;
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277 if (NodeUtil.replaceChild(this.parent, this, newNode)) {
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278 this.parent.adoptHelper(newNode);
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279 } else {
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280 this.parent.adoptUnadoptedHelper(newNode);
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281 }
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282 reportReplace(this, newNode, reason);
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283 onReplace(newNode, reason);
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284 }
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285
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286 /**
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287 * Checks if this node is properly adopted by a parent and can be replaced.
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288 *
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289 * @return {@code true} if it is safe to replace this node.
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290 */
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291 public final boolean isReplaceable() {
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292 if (getParent() != null) {
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293 for (Node sibling : getParent().getChildren()) {
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294 if (sibling == this) {
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295 return true;
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296 }
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297 }
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298 }
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299 return false;
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300 }
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301
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302 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) {
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303 Node node = this;
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304 while (node != null) {
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305 if (node instanceof ReplaceObserver) {
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306 ((ReplaceObserver) node).nodeReplaced(oldNode, newNode, reason);
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307 } else if (node instanceof RootNode) {
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308 CallTarget target = ((RootNode) node).getCallTarget();
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309 if (target instanceof ReplaceObserver) {
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310 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason);
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311 }
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312 }
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313 node = node.getParent();
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314 }
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315 if (TruffleOptions.TraceRewrites) {
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316 NodeUtil.traceRewrite(this, newNode, reason);
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317 }
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318 if (TruffleOptions.TraceASTJSON) {
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319 JSONHelper.dumpReplaceChild(this, newNode, reason);
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320 }
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321 }
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322
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323 /**
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324 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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325 * node is rewritten. This method is invoked before the actual replace has happened.
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326 *
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327 * @param newNode the replacement node
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328 * @param reason the reason the replace supplied
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329 */
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330 protected void onReplace(Node newNode, CharSequence reason) {
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331 // empty default
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332 }
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333
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334 /**
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335 * Subclasses of {@link Node} can implement this method to execute extra functionality when a
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336 * node is effectively inserted into the AST. The {@code onAdopt} callback is called after the
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337 * node has been effectively inserted, and it is guaranteed to be called only once for any given
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338 * node.
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339 */
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340 protected void onAdopt() {
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341 // empty default
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342 }
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343
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344 /**
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345 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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346 * child nodes.
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347 *
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348 * @param nodeVisitor the visitor
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349 */
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350 public final void accept(NodeVisitor nodeVisitor) {
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351 if (nodeVisitor.visit(this)) {
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352 for (Node child : this.getChildren()) {
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353 if (child != null) {
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354 child.accept(nodeVisitor);
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355 }
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356 }
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357 }
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358 }
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359
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360 /**
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361 * Iterator over the children of this node.
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362 *
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363 * @return the iterator
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364 */
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365 public final Iterable<Node> getChildren() {
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366 return new Iterable<Node>() {
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367 public Iterator<Node> iterator() {
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368 return NodeUtil.makeIterator(Node.this);
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369 }
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370 };
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371 }
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372
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373 /**
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374 * Creates a shallow copy of this node.
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375 *
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376 * @return the new copy
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377 */
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378 public Node copy() {
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379 try {
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380 return (Node) super.clone();
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381 } catch (CloneNotSupportedException e) {
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382 return null;
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383 }
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384 }
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385
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386 /**
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387 * This method must never be called. It enforces that {@link Object#clone} is not directly
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388 * called by subclasses. Use the {@link #copy()} method instead.
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389 */
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390 @Override
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391 @Deprecated
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392 protected final Object clone() throws CloneNotSupportedException {
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393 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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394 }
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395
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396 /**
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397 * Get the root node of the tree a node belongs to.
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398 *
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399 * @return the {@link RootNode} or {@code null} if there is none.
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400 */
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401 public final RootNode getRootNode() {
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402 Node rootNode = this;
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403 while (rootNode.getParent() != null) {
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404 assert !(rootNode instanceof RootNode) : "root node must not have a parent";
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405 rootNode = rootNode.getParent();
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406 }
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407 if (rootNode instanceof RootNode) {
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408 return (RootNode) rootNode;
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409 }
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410 return null;
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411 }
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412
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413 /**
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414 * Converts this node to a textual representation useful for debugging.
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415 */
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416 @Override
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417 public String toString() {
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418 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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419 Map<String, Object> properties = getDebugProperties();
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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420 boolean hasProperties = false;
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421 for (Map.Entry<String, Object> entry : properties.entrySet()) {
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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422 sb.append(hasProperties ? "," : "<");
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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423 hasProperties = true;
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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424 sb.append(entry.getKey()).append("=").append(entry.getValue());
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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425 }
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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426 if (hasProperties) {
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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427 sb.append(">");
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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428 }
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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429 sb.append("@").append(Integer.toHexString(hashCode()));
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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430 return sb.toString();
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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431 }
14629
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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432
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433 public final void atomic(Runnable closure) {
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434 RootNode rootNode = getRootNode();
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Andreas Woess <andreas.woess@jku.at>
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435 if (rootNode != null) {
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Andreas Woess <andreas.woess@jku.at>
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436 synchronized (rootNode) {
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437 closure.run();
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438 }
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439 } else {
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440 closure.run();
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441 }
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442 }
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Andreas Woess <andreas.woess@jku.at>
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443
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444 public final <T> T atomic(Callable<T> closure) {
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445 try {
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446 RootNode rootNode = getRootNode();
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447 if (rootNode != null) {
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448 synchronized (rootNode) {
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449 return closure.call();
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450 }
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451 } else {
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452 return closure.call();
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453 }
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454 } catch (RuntimeException e) {
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455 throw e;
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456 } catch (Exception e) {
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457 throw new RuntimeException(e);
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458 }
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459 }
15775
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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460
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Christian Wirth <christian.wirth@oracle.com>
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461 /**
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462 * Returns a user-readable description of the purpose of the Node, or "" if no description is
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463 * available.
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464 */
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465 public String getDescription() {
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466 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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467 if (info != null) {
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468 return info.description();
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469 }
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470 return "";
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471 }
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472
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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473 /**
4293efaaab76 Add description and language to the NodeInfo annotation
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474 * Returns a string representing the language this node has been implemented for. If the
4293efaaab76 Add description and language to the NodeInfo annotation
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475 * language is unknown, returns "".
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476 */
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Christian Wirth <christian.wirth@oracle.com>
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477 public String getLanguage() {
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478 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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479 if (info != null && info.language() != null && info.language().length() > 0) {
4293efaaab76 Add description and language to the NodeInfo annotation
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480 return info.language();
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481 }
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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diff changeset
482 if (parent != null) {
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Christian Wirth <christian.wirth@oracle.com>
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diff changeset
483 return parent.getLanguage();
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Christian Wirth <christian.wirth@oracle.com>
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diff changeset
484 }
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
485 return "";
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
486 }
7267
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
487 }