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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 10481:29e9a5d18c70

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Clean up.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 23 Jun 2013 20:50:18 +0200
parents ba02d19dd3cc
children 6eb8d63cea34
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1 /*
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2 * Copyright (c) 2012, 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.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.api.nodes;
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25 import java.lang.annotation.*;
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26 import java.util.*;
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28 import com.oracle.truffle.api.*;
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30 /**
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31 * Abstract base class for all Truffle nodes.
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32 */
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33 public abstract class Node implements Cloneable {
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34
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35 /**
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36 * Utility constant representing an empty node array.
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37 */
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38 public static final Node[] EMPTY_ARRAY = new Node[0];
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39
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40 private Node parent;
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41
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42 private SourceSection sourceSection;
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43
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44 /**
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45 * Marks array fields that are children of this node.
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46 */
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47 @Retention(RetentionPolicy.RUNTIME)
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48 @Target({ElementType.FIELD})
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49 public @interface Children {
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50 }
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51
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52 /**
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53 * Marks fields that represent child nodes of this node.
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54 */
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55 @Retention(RetentionPolicy.RUNTIME)
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56 @Target({ElementType.FIELD})
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57 public @interface Child {
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58 }
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59
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60 protected Node() {
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61 CompilerAsserts.neverPartOfCompilation();
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62 }
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63
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64 /**
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65 * Assigns a link to a guest language source section to this node.
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66 *
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67 * @param section the object representing a section in guest language source code
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68 */
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69 public final void assignSourceSection(SourceSection section) {
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70 if (sourceSection != null) {
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71 throw new IllegalStateException("Source section is already assigned.");
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72 }
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73 this.sourceSection = section;
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74 }
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75
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76 /**
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77 * Clears any previously assigned guest language source code from this node.
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78 */
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79 public final void clearSourceSection() {
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80 this.sourceSection = null;
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81 }
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83 /**
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84 * Retrieves the guest language source code section that is currently assigned to this node.
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85 *
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86 * @return the assigned source code section
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87 */
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88 public final SourceSection getSourceSection() {
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89 return sourceSection;
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90 }
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91
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92 /**
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93 * Retrieves the guest language source code section that is currently assigned to this node.
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94 *
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95 * @return the assigned source code section
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96 */
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97 public final SourceSection getEncapsulatingSourceSection() {
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98 if (sourceSection == null && getParent() != null) {
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99 return getParent().getEncapsulatingSourceSection();
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100 }
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101 return sourceSection;
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102 }
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103
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104 /**
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105 * Method that updates the link to the parent in the array of specified new child nodes to this
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106 * node.
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107 *
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108 * @param newChildren the array of new children whose parent should be updated
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109 * @return the array of new children
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110 */
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111 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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112 if (newChildren != null) {
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113 for (T n : newChildren) {
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114 adoptChild(n);
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115 }
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116 }
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117 return newChildren;
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118 }
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119
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120 /**
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121 * Method that updates the link to the parent in the specified new child node to this node.
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122 *
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123 * @param newChild the new child whose parent should be updated
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124 * @return the new child
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125 */
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126 protected final <T extends Node> T adoptChild(T newChild) {
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127 if (newChild != null) {
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128 if (newChild == this) {
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129 throw new IllegalStateException("The parent of a node can never be the node itself.");
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130 }
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131 ((Node) newChild).parent = this;
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132 }
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133 return newChild;
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134 }
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135
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136 /**
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137 * Returns properties of this node interesting for debugging and can be overwritten by
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138 * subclasses to add their own custom properties.
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139 *
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140 * @return the properties as a key/value hash map
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141 */
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142 public Map<String, Object> getDebugProperties() {
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143 Map<String, Object> properties = new HashMap<>();
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144 return properties;
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145 }
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146
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147 /**
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148 * The current parent node of this node.
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149 *
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150 * @return the parent node
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151 */
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152 public final Node getParent() {
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153 return parent;
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154 }
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155
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156 /**
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157 * Replaces this node with another node. If there is a source section (see
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158 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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159 *
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160 * @param newNode the new node that is the replacement
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161 * @param reason a description of the reason for the replacement
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162 * @return the new node
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163 */
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164 @SuppressWarnings({"unchecked"})
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165 public final <T extends Node> T replace(T newNode, String reason) {
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166 if (this.getParent() == null) {
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167 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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168 }
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169 if (sourceSection != null) {
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170 // Pass on the source section to the new node.
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171 newNode.assignSourceSection(sourceSection);
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172 }
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173 onReplace(newNode, reason);
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174 return (T) this.getParent().replaceChild(this, newNode);
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175 }
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176
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177 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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178 NodeUtil.replaceChild(this, oldChild, newChild);
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179 adoptChild(newChild);
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180 return newChild;
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181 }
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182
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183 /**
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184 * Replaces this node with another node. If there is a source section (see
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185 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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186 *
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187 * @param newNode the new node that is the replacement
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188 * @return the new node
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189 */
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190 public final <T extends Node> T replace(T newNode) {
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191 return replace(newNode, "");
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192 }
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193
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194 /**
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195 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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196 * node is rewritten. This method is invoked before the actual replace has happened.
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197 *
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198 * @param newNode the replacement node
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199 * @param reason the reason the replace supplied
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200 */
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201 protected void onReplace(Node newNode, String reason) {
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202 }
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203
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204 /**
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205 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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206 * child nodes.
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207 *
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208 * @param nodeVisitor the visitor
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209 */
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210 public final void accept(NodeVisitor nodeVisitor) {
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211 if (nodeVisitor.visit(this)) {
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212 for (Node child : this.getChildren()) {
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213 if (child != null) {
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214 child.accept(nodeVisitor);
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215 }
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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 * Iterator over the children of this node.
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222 *
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223 * @return the iterator
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224 */
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225 public final Iterable<Node> getChildren() {
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226 final Node node = this;
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227 return new Iterable<Node>() {
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228
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229 public Iterator<Node> iterator() {
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230 return new NodeUtil.NodeIterator(node);
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231 }
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232 };
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233 }
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234
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235 /**
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236 * Creates a shallow copy of this node.
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237 *
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238 * @return the new copy
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239 */
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240 public Node copy() {
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241 try {
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242 return (Node) super.clone();
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243 } catch (CloneNotSupportedException e) {
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244 return null;
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245 }
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246 }
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247
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248 /**
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249 * This method must never be called. It enforces that {@link Object#clone} is not directly
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250 * called by subclasses. Use the {@link #copy()} method instead.
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251 */
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252 @Override
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253 @Deprecated
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254 protected final Object clone() throws CloneNotSupportedException {
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255 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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256 }
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257
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258 /**
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259 * Converts this node to a textual representation useful for debugging.
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260 */
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261 @Override
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262 public String toString() {
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263 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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264 Map<String, Object> properties = getDebugProperties();
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265 boolean hasProperties = false;
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266 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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267 sb.append(hasProperties ? "," : "<");
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268 hasProperties = true;
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269 sb.append(entry.getKey()).append("=").append(entry.getValue());
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270 }
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271 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>
parents:
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272 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.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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273 }
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:
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274 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.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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275 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>
parents:
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276 }
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:
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277 }