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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 13994:989f58d6a0ca

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Truffle: Added API for Node.getKind().
author Christian Humer <christian.humer@gmail.com>
date Fri, 21 Feb 2014 02:24:03 +0100
parents f46cab39a9a2
children c5411233cdf8
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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.io.*;
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28 import java.lang.annotation.*;
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29 import java.util.*;
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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.nodes.NodeInfo.Kind;
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33
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34 /**
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35 * Abstract base class for all Truffle nodes.
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36 */
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37 public abstract class Node implements Cloneable {
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38
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39 private Node parent;
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40
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41 private SourceSection sourceSection;
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42
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43 /**
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44 * Marks array fields that are children of this node.
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45 */
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46 @Retention(RetentionPolicy.RUNTIME)
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47 @Target({ElementType.FIELD})
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48 public @interface Children {
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49 }
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50
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51 /**
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52 * Marks fields that represent child nodes of this node.
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53 */
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54 @Retention(RetentionPolicy.RUNTIME)
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55 @Target({ElementType.FIELD})
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56 public @interface Child {
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57 }
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58
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59 protected Node() {
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60 CompilerAsserts.neverPartOfCompilation();
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61 }
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62
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63 protected Node(SourceSection sourceSection) {
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64 CompilerAsserts.neverPartOfCompilation();
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65 this.sourceSection = sourceSection;
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66 }
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67
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68 /**
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69 * Assigns a link to a guest language source section to this node.
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70 *
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71 * @param section the object representing a section in guest language source code
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72 */
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73 public final void assignSourceSection(SourceSection section) {
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74 if (sourceSection != null) {
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75 // Patch this test during the transition to constructor-based
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76 // source attribution, which would otherwise trigger this
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77 // exception. This method will eventually be deprecated.
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78 if (getSourceSection() != section) {
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79 throw new IllegalStateException("Source section is already assigned. Old: " + getSourceSection() + ", new: " + section);
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80 }
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81 }
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82 this.sourceSection = section;
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83 }
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84
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85 public Kind getKind() {
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86 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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87 if (info != null) {
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88 return info.kind();
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89 }
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90 return Kind.SPECIALIZED;
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91 }
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92
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93 /**
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94 * Clears any previously assigned guest language source code from this node.
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95 */
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96 public final void clearSourceSection() {
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97 this.sourceSection = null;
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98 }
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99
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100 /**
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101 * Retrieves the guest language source code section that is currently assigned to this node.
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102 *
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103 * @return the assigned source code section
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104 */
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105 public final SourceSection getSourceSection() {
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106 return sourceSection;
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107 }
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108
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109 /**
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110 * Retrieves the guest language source code section that is currently assigned to this node.
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111 *
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112 * @return the assigned source code section
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113 */
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114 @CompilerDirectives.SlowPath
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115 public final SourceSection getEncapsulatingSourceSection() {
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116 if (sourceSection == null && getParent() != null) {
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117 return getParent().getEncapsulatingSourceSection();
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118 }
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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 * Method that updates the link to the parent in the array of specified new child nodes to this
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124 * node.
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125 *
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126 * @param newChildren the array of new children whose parent should be updated
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127 * @return the array of new children
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128 */
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129 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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130 if (newChildren != null) {
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131 for (T n : newChildren) {
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132 adoptChild(n);
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133 }
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134 }
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135 return newChildren;
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136 }
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137
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138 /**
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139 * Method that updates the link to the parent in the specified new child node to this node.
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140 *
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141 * @param newChild the new child whose parent should be updated
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142 * @return the new child
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143 */
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144 protected final <T extends Node> T adoptChild(T newChild) {
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145 if (newChild != null) {
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146 if (newChild == this) {
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147 throw new IllegalStateException("The parent of a node can never be the node itself.");
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148 }
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149 ((Node) newChild).parent = this;
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150 }
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151 return newChild;
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152 }
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153
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154 /**
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155 * Returns properties of this node interesting for debugging and can be overwritten by
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156 * subclasses to add their own custom properties.
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157 *
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158 * @return the properties as a key/value hash map
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159 */
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160 public Map<String, Object> getDebugProperties() {
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161 Map<String, Object> properties = new HashMap<>();
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162 return properties;
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163 }
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164
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165 /**
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166 * The current parent node of this node.
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167 *
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168 * @return the parent node
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169 */
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170 public final Node getParent() {
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171 return parent;
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172 }
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173
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174 /**
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175 * Replaces this node with another node. If there is a source section (see
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176 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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177 *
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178 * @param newNode the new node that is the replacement
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179 * @param reason a description of the reason for the replacement
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180 * @return the new node
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181 */
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182 public final <T extends Node> T replace(T newNode, String reason) {
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183 CompilerDirectives.transferToInterpreterAndInvalidate();
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184 if (this.getParent() == null) {
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185 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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186 }
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187 if (sourceSection != null && newNode.getSourceSection() == null) {
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188 // Pass on the source section to the new node.
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189 newNode.assignSourceSection(sourceSection);
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190 }
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191 onReplace(newNode, reason);
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192 ((Node) newNode).parent = this.parent;
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193 if (!NodeUtil.replaceChild(this.parent, this, newNode)) {
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194 fixupTree();
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195 }
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196 reportReplace(this, newNode, reason);
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197 return newNode;
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198 }
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199
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200 /**
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201 * Rewrite has failed; the tree is likely inconsistent, so fix any stale parent references.
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202 *
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203 * This is a rather expensive operation but rare to occur.
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204 */
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205 private void fixupTree() {
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206 Node rootNode = getRootNode();
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207 if (rootNode == null) {
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208 throw new UnsupportedOperationException("Tree does not have a root node.");
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209 }
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210 int fixCount = rootNode.fixupChildren();
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diff changeset
211 assert fixCount != 0 : "sanity check failed: missing @Child[ren] or adoptChild?";
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212 // if nothing had to be fixed, rewrite failed due to node not being a proper child.
12494
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213 }
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214
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215 private int fixupChildren() {
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216 int fixCount = 0;
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217 for (Node child : getChildren()) {
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diff changeset
218 if (child != null) {
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diff changeset
219 if (child.parent != this) {
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220 child.parent = this;
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diff changeset
221 fixCount++;
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222 }
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diff changeset
223 fixCount += child.fixupChildren();
12494
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224 }
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225 }
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226 return fixCount;
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cdf10fb20022 Remove Node.replaceChild method from the public API. Node.replace remains as the only method in the API to modify the AST.
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227 }
cdf10fb20022 Remove Node.replaceChild method from the public API. Node.replace remains as the only method in the API to modify the AST.
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228
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229 /**
9256
9640bb930327 Preserve the source section during node rewrites.
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230 * Replaces this node with another node. If there is a source section (see
9640bb930327 Preserve the source section during node rewrites.
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231 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
7530
5e3d1a68664e applied mx eclipseformat to all Java files
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232 *
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233 * @param newNode the new node that is the replacement
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234 * @return the new node
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235 */
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diff changeset
236 public final <T extends Node> T replace(T newNode) {
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237 return replace(newNode, "");
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238 }
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239
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240 /**
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241 * Checks if this node is properly adopted by a parent and can be replaced.
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242 *
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243 * @return {@code true} if it is safe to replace this node.
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244 */
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Andreas Woess <andreas.woess@jku.at>
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245 public final boolean isReplaceable() {
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
246 if (getParent() != null) {
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diff changeset
247 for (Node sibling : getParent().getChildren()) {
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diff changeset
248 if (sibling == this) {
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
249 return true;
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250 }
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251 }
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252 }
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253 return false;
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254 }
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diff changeset
255
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diff changeset
256 private void reportReplace(Node oldNode, Node newNode, String reason) {
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diff changeset
257 Collection<CallTarget> targets = NodeUtil.findOutermostCallTargets(this);
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diff changeset
258 for (CallTarget target : targets) {
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diff changeset
259 if (target instanceof ReplaceObserver) {
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diff changeset
260 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason);
12692
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diff changeset
261 }
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
262 }
ffd4b6b4ae68 Truffle Node class refactoring.
Andreas Woess <andreas.woess@jku.at>
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diff changeset
263 }
ffd4b6b4ae68 Truffle Node class refactoring.
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diff changeset
264
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diff changeset
265 /**
9782
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Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
266 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
267 * node is rewritten. This method is invoked before the actual replace has happened.
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
268 *
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Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
269 * @param newNode the replacement node
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diff changeset
270 * @param reason the reason the replace supplied
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
271 */
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
Christian Humer <christian.humer@gmail.com>
parents: 9256
diff changeset
272 protected void onReplace(Node newNode, String reason) {
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diff changeset
273 if (TruffleOptions.TraceRewrites) {
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
274 traceRewrite(newNode, reason);
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diff changeset
275 }
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
276 }
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
277
ffd4b6b4ae68 Truffle Node class refactoring.
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diff changeset
278 private void traceRewrite(Node newNode, String reason) {
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Andreas Woess <andreas.woess@jku.at>
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diff changeset
279 Class<? extends Node> from = getClass();
ffd4b6b4ae68 Truffle Node class refactoring.
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diff changeset
280 Class<? extends Node> to = newNode.getClass();
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diff changeset
281
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diff changeset
282 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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parents: 12495
diff changeset
283 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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parents: 12495
diff changeset
284 return;
10862
8c570011b86f Truffle: when a node is replaced, notify optimized call target and delay compilation.
Andreas Woess <andreas.woess@jku.at>
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diff changeset
285 }
8c570011b86f Truffle: when a node is replaced, notify optimized call target and delay compilation.
Andreas Woess <andreas.woess@jku.at>
parents: 10846
diff changeset
286 }
10590
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parents: 10481
diff changeset
287
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diff changeset
288 if (TruffleOptions.TraceRewritesFilterToKind != null) {
ffd4b6b4ae68 Truffle Node class refactoring.
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parents: 12495
diff changeset
289 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
10590
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parents: 10481
diff changeset
290 return;
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
291 }
12692
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diff changeset
292 }
10590
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parents: 10481
diff changeset
293
12692
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Andreas Woess <andreas.woess@jku.at>
parents: 12495
diff changeset
294 String filter = TruffleOptions.TraceRewritesFilterClass;
ffd4b6b4ae68 Truffle Node class refactoring.
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parents: 12495
diff changeset
295 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
ffd4b6b4ae68 Truffle Node class refactoring.
Andreas Woess <andreas.woess@jku.at>
parents: 12495
diff changeset
296 return;
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diff changeset
297 }
12692
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diff changeset
298
ffd4b6b4ae68 Truffle Node class refactoring.
Andreas Woess <andreas.woess@jku.at>
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diff changeset
299 PrintStream out = System.out;
ffd4b6b4ae68 Truffle Node class refactoring.
Andreas Woess <andreas.woess@jku.at>
parents: 12495
diff changeset
300 out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
10590
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
301 }
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
302
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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diff changeset
303 private static String formatNodeInfo(Class<? extends Node> clazz) {
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
304 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
305 String kind = "?";
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parents: 10481
diff changeset
306 if (nodeInfo != null) {
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
307 switch (nodeInfo.kind()) {
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
308 case GENERIC:
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
309 kind = "G";
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parents: 10481
diff changeset
310 break;
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
311 case SPECIALIZED:
6eb8d63cea34 Added a feature to trace rewrites of truffle nodes.
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parents: 10481
diff changeset
312 kind = "S";
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313 break;
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314 case UNINITIALIZED:
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315 kind = "U";
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316 break;
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317 case POLYMORPHIC:
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318 kind = "P";
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319 break;
10590
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320 default:
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321 kind = "?";
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322 break;
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323 }
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324 }
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325 return kind + " " + clazz.getSimpleName();
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326 }
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327
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328 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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329 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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330 if (info != null) {
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331 return info.kind() != kind;
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332 }
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333 return true;
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334 }
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335
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336 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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337 Class<?> currentFrom = from;
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338 while (currentFrom != null) {
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339 if (currentFrom.getName().contains(filter)) {
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340 return false;
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341 }
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342 currentFrom = currentFrom.getSuperclass();
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343 }
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344 return true;
9782
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345 }
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346
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347 /**
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348 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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349 * child nodes.
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350 *
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351 * @param nodeVisitor the visitor
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352 */
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353 public final void accept(NodeVisitor nodeVisitor) {
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354 if (nodeVisitor.visit(this)) {
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355 for (Node child : this.getChildren()) {
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356 if (child != null) {
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357 child.accept(nodeVisitor);
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358 }
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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 * Iterator over the children of this node.
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365 *
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366 * @return the iterator
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367 */
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368 public final Iterable<Node> getChildren() {
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369 final Node node = this;
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370 return new Iterable<Node>() {
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371
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372 public Iterator<Node> iterator() {
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373 return new NodeUtil.NodeIterator(node);
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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 /**
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379 * Creates a shallow copy of this node.
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380 *
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381 * @return the new copy
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382 */
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383 public Node copy() {
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384 try {
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385 return (Node) super.clone();
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386 } catch (CloneNotSupportedException e) {
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387 return null;
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388 }
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389 }
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390
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391 /**
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392 * This method must never be called. It enforces that {@link Object#clone} is not directly
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393 * called by subclasses. Use the {@link #copy()} method instead.
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394 */
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395 @Override
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396 @Deprecated
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397 protected final Object clone() throws CloneNotSupportedException {
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398 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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399 }
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400
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401 /**
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402 * Get the root node of the tree a node belongs to.
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403 *
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404 * @return the {@link RootNode} or {@code null} if there is none.
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405 */
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406 public final RootNode getRootNode() {
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407 Node rootNode = this;
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408 while (rootNode.getParent() != null) {
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409 assert !(rootNode instanceof RootNode) : "root node must not have a parent";
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410 rootNode = rootNode.getParent();
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411 }
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412 if (rootNode instanceof RootNode) {
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413 return (RootNode) rootNode;
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414 }
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415 return null;
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416 }
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417
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418 /**
7267
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419 * Converts this node to a textual representation useful for debugging.
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420 */
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421 @Override
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422 public String toString() {
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423 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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424 Map<String, Object> properties = getDebugProperties();
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425 boolean hasProperties = false;
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426 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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427 sb.append(hasProperties ? "," : "<");
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428 hasProperties = true;
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429 sb.append(entry.getKey()).append("=").append(entry.getValue());
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430 }
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431 if (hasProperties) {
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432 sb.append(">");
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433 }
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434 sb.append("@").append(Integer.toHexString(hashCode()));
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435 return sb.toString();
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436 }
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437 }