annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 17389:763a34f283f9

make Truffle Node parent @CompilationFinal, let getEncapsulatingSourceSection evaluate at compile time
author Lukas Stadler <lukas.stadler@oracle.com>
date Thu, 09 Oct 2014 13:26:17 +0200
parents e1da729b3e4e
children 65a160d9d259
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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 @CompilationFinal 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 @ExplodeLoop
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128 public final SourceSection getEncapsulatingSourceSection() {
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129 Node current = this;
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130 while (current != null) {
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131 if (current.sourceSection != null) {
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132 return current.sourceSection;
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133 }
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134 current = current.parent;
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135 }
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136 return null;
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137 }
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138
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139 /**
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140 * Method that updates the link to the parent in the array of specified new child nodes to this
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141 * node.
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142 *
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143 * @param newChildren the array of new children whose parent should be updated
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144 * @return the array of new children
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145 */
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146 protected final <T extends Node> T[] insert(final T[] newChildren) {
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147 CompilerDirectives.transferToInterpreterAndInvalidate();
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148 assert newChildren != null;
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149 for (Node newChild : newChildren) {
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150 adoptHelper(newChild);
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151 }
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152 return newChildren;
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153 }
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154
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155 /**
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156 * Method that updates the link to the parent in the specified new child node to this node.
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157 *
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158 * @param newChild the new child whose parent should be updated
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159 * @return the new child
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160 */
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161 protected final <T extends Node> T insert(final T newChild) {
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162 CompilerDirectives.transferToInterpreterAndInvalidate();
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163 assert newChild != null;
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164 adoptHelper(newChild);
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165 return newChild;
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166 }
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167
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168 public final void adoptChildren() {
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169 CompilerDirectives.transferToInterpreterAndInvalidate();
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170 adoptHelper();
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171 }
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172
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173 private void adoptHelper(final Node newChild) {
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174 assert newChild != null;
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175 if (newChild == this) {
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176 throw new IllegalStateException("The parent of a node can never be the node itself.");
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177 }
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178 boolean isInserted = newChild.parent == null;
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179 newChild.parent = this;
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180 if (TruffleOptions.TraceASTJSON) {
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181 JSONHelper.dumpNewChild(this, newChild);
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182 }
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183 newChild.adoptHelper();
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184 if (isInserted) {
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185 newChild.onAdopt();
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186 }
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187 }
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188
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189 private void adoptHelper() {
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190 Iterable<Node> children = this.getChildren();
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191 for (Node child : children) {
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192 if (child != null && child.getParent() != this) {
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193 this.adoptHelper(child);
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194 }
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195 }
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196 }
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197
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198 private void adoptUnadoptedHelper(final Node newChild) {
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199 assert newChild != null;
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200 if (newChild == this) {
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201 throw new IllegalStateException("The parent of a node can never be the node itself.");
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202 }
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203 boolean isInserted = newChild.parent == null;
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204 newChild.parent = this;
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205 newChild.adoptUnadoptedHelper();
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206 if (isInserted) {
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207 newChild.onAdopt();
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208 }
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209 }
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210
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211 private void adoptUnadoptedHelper() {
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212 Iterable<Node> children = this.getChildren();
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213 for (Node child : children) {
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214 if (child != null && child.getParent() == null) {
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215 this.adoptUnadoptedHelper(child);
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216 }
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217 }
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218 }
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219
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220 /**
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221 * Returns properties of this node interesting for debugging and can be overwritten by
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222 * subclasses to add their own custom properties.
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223 *
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224 * @return the properties as a key/value hash map
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225 */
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226 public Map<String, Object> getDebugProperties() {
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227 Map<String, Object> properties = new HashMap<>();
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228 return properties;
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229 }
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230
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231 /**
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232 * The current parent node of this node.
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233 *
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234 * @return the parent node
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235 */
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236 public final Node getParent() {
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237 return parent;
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238 }
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239
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240 /**
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241 * Replaces this node with another node. If there is a source section (see
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242 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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243 *
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244 * @param newNode the new node that is the replacement
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245 * @param reason a description of the reason for the replacement
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246 * @return the new node
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247 */
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248 public final <T extends Node> T replace(final T newNode, final CharSequence reason) {
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249 CompilerDirectives.transferToInterpreterAndInvalidate();
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250 atomic(new Runnable() {
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251 public void run() {
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252 replaceHelper(newNode, reason);
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253 }
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254 });
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255 return newNode;
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256 }
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257
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258 /**
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259 * Replaces this node with another node. If there is a source section (see
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260 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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261 *
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262 * @param newNode the new node that is the replacement
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263 * @return the new node
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264 */
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265 public final <T extends Node> T replace(T newNode) {
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266 return replace(newNode, "");
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267 }
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268
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269 private void replaceHelper(Node newNode, CharSequence reason) {
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270 CompilerAsserts.neverPartOfCompilation();
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271 if (this.getParent() == null) {
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272 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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273 }
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274 if (sourceSection != null && newNode.getSourceSection() == null) {
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275 // Pass on the source section to the new node.
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276 newNode.assignSourceSection(sourceSection);
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277 }
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278 // (aw) need to set parent *before* replace, so that (unsynchronized) getRootNode()
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279 // will always find the root node
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280 newNode.parent = this.parent;
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281 if (NodeUtil.replaceChild(this.parent, this, newNode)) {
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282 this.parent.adoptHelper(newNode);
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283 } else {
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284 this.parent.adoptUnadoptedHelper(newNode);
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285 }
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286 reportReplace(this, newNode, reason);
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287 onReplace(newNode, reason);
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288 }
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289
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290 /**
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291 * Checks if this node is properly adopted by a parent and can be replaced.
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292 *
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293 * @return {@code true} if it is safe to replace this node.
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294 */
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295 public final boolean isReplaceable() {
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296 if (getParent() != null) {
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297 for (Node sibling : getParent().getChildren()) {
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298 if (sibling == this) {
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299 return true;
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300 }
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301 }
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302 }
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303 return false;
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304 }
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305
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306 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) {
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307 Node node = this;
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308 while (node != null) {
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309 if (node instanceof ReplaceObserver) {
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310 ((ReplaceObserver) node).nodeReplaced(oldNode, newNode, reason);
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311 } else if (node instanceof RootNode) {
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312 CallTarget target = ((RootNode) node).getCallTarget();
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313 if (target instanceof ReplaceObserver) {
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314 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason);
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315 }
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316 }
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317 node = node.getParent();
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318 }
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319 if (TruffleOptions.TraceRewrites) {
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320 NodeUtil.traceRewrite(this, newNode, reason);
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321 }
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322 if (TruffleOptions.TraceASTJSON) {
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323 JSONHelper.dumpReplaceChild(this, newNode, reason);
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324 }
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325 }
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326
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327 /**
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328 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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329 * node is rewritten. This method is invoked before the actual replace has happened.
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330 *
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331 * @param newNode the replacement node
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332 * @param reason the reason the replace supplied
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333 */
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334 protected void onReplace(Node newNode, CharSequence reason) {
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335 // empty default
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336 }
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337
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338 /**
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339 * Subclasses of {@link Node} can implement this method to execute extra functionality when a
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340 * node is effectively inserted into the AST. The {@code onAdopt} callback is called after the
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341 * node has been effectively inserted, and it is guaranteed to be called only once for any given
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342 * node.
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343 */
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344 protected void onAdopt() {
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345 // empty default
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346 }
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347
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348 /**
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349 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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350 * child nodes.
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351 *
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352 * @param nodeVisitor the visitor
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353 */
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354 public final void accept(NodeVisitor nodeVisitor) {
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355 if (nodeVisitor.visit(this)) {
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356 for (Node child : this.getChildren()) {
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357 if (child != null) {
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358 child.accept(nodeVisitor);
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359 }
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360 }
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361 }
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362 }
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363
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364 /**
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365 * Iterator over the children of this node.
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366 *
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367 * @return the iterator
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368 */
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369 public final Iterable<Node> getChildren() {
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370 return new Iterable<Node>() {
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371 public Iterator<Node> iterator() {
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372 return NodeUtil.makeIterator(Node.this);
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373 }
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374 };
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375 }
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376
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377 /**
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378 * Creates a shallow copy of this node.
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379 *
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380 * @return the new copy
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381 */
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382 public Node copy() {
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383 try {
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384 return (Node) super.clone();
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385 } catch (CloneNotSupportedException e) {
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386 return null;
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387 }
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388 }
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389
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390 /**
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391 * This method must never be called. It enforces that {@link Object#clone} is not directly
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392 * called by subclasses. Use the {@link #copy()} method instead.
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393 */
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394 @Override
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395 @Deprecated
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396 protected final Object clone() throws CloneNotSupportedException {
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397 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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398 }
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399
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400 /**
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401 * Get the root node of the tree a node belongs to.
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402 *
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403 * @return the {@link RootNode} or {@code null} if there is none.
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404 */
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405 public final RootNode getRootNode() {
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406 Node rootNode = this;
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407 while (rootNode.getParent() != null) {
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408 assert !(rootNode instanceof RootNode) : "root node must not have a parent";
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409 rootNode = rootNode.getParent();
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410 }
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411 if (rootNode instanceof RootNode) {
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412 return (RootNode) rootNode;
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413 }
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414 return null;
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415 }
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416
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417 /**
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418 * Converts this node to a textual representation useful for debugging.
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419 */
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420 @Override
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421 public String toString() {
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422 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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423 Map<String, Object> properties = getDebugProperties();
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 boolean hasProperties = false;
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 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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426 sb.append(hasProperties ? "," : "<");
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427 hasProperties = true;
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428 sb.append(entry.getKey()).append("=").append(entry.getValue());
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429 }
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430 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.
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431 sb.append(">");
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432 }
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433 sb.append("@").append(Integer.toHexString(hashCode()));
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434 return sb.toString();
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435 }
14629
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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436
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437 public final void atomic(Runnable closure) {
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438 RootNode rootNode = getRootNode();
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439 if (rootNode != null) {
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440 synchronized (rootNode) {
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441 closure.run();
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442 }
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443 } else {
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444 closure.run();
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445 }
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446 }
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447
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448 public final <T> T atomic(Callable<T> closure) {
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449 try {
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450 RootNode rootNode = getRootNode();
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451 if (rootNode != null) {
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452 synchronized (rootNode) {
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453 return closure.call();
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454 }
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455 } else {
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456 return closure.call();
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457 }
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458 } catch (RuntimeException e) {
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459 throw e;
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460 } catch (Exception e) {
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461 throw new RuntimeException(e);
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462 }
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463 }
15775
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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464
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465 /**
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466 * Returns a user-readable description of the purpose of the Node, or "" if no description is
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467 * available.
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468 */
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469 public String getDescription() {
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470 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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471 if (info != null) {
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472 return info.description();
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473 }
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474 return "";
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475 }
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476
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477 /**
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478 * Returns a string representing the language this node has been implemented for. If the
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479 * language is unknown, returns "".
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480 */
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481 public String getLanguage() {
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482 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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483 if (info != null && info.language() != null && info.language().length() > 0) {
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484 return info.language();
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485 }
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486 if (parent != null) {
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487 return parent.getLanguage();
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488 }
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489 return "";
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490 }
7267
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491 }