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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 11648:4ab1f371adc8

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Do not assign new source section if replacing node already has source section assigned.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 15 Sep 2013 16:31:32 +0200
parents 5f532ea846fb
children 793743715dc1
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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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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
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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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
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30 import com.oracle.truffle.api.*;
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31 import com.oracle.truffle.api.nodes.NodeInfo.Kind;
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32
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33 /**
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34 * Abstract base class for all Truffle nodes.
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35 */
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36 public abstract class Node implements Cloneable {
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37
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38 private Node parent;
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39
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40 private SourceSection sourceSection;
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41
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42 /**
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43 * Marks array fields that are children of this node.
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44 */
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45 @Retention(RetentionPolicy.RUNTIME)
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46 @Target({ElementType.FIELD})
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47 public @interface Children {
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48 }
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49
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50 /**
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51 * Marks fields that represent child nodes of this node.
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52 */
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53 @Retention(RetentionPolicy.RUNTIME)
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54 @Target({ElementType.FIELD})
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55 public @interface Child {
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56 }
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57
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58 protected Node() {
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59 CompilerAsserts.neverPartOfCompilation();
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60 }
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61
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62 protected Node(SourceSection sourceSection) {
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63 CompilerAsserts.neverPartOfCompilation();
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64 this.sourceSection = sourceSection;
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65 }
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66
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67 /**
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68 * Assigns a link to a guest language source section to this node.
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69 *
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70 * @param section the object representing a section in guest language source code
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71 */
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72 public final void assignSourceSection(SourceSection section) {
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73 if (sourceSection != null) {
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74 // Patch this test during the transition to constructor-based
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75 // source attribution, which would otherwise trigger this
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76 // exception. This method will eventually be deprecated.
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77 if (getSourceSection() != section) {
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78 throw new IllegalStateException("Source section is already assigned. Old: " + getSourceSection() + ", new: " + section);
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79 }
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80 }
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81 this.sourceSection = section;
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82 }
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84 /**
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85 * Clears any previously assigned guest language source code from this node.
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86 */
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87 public final void clearSourceSection() {
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88 this.sourceSection = null;
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89 }
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90
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91 /**
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92 * Retrieves the guest language source code section that is currently assigned to this node.
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93 *
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94 * @return the assigned source code section
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95 */
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96 public final SourceSection getSourceSection() {
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97 return sourceSection;
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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 getEncapsulatingSourceSection() {
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106 if (sourceSection == null && getParent() != null) {
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107 return getParent().getEncapsulatingSourceSection();
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108 }
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109 return sourceSection;
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110 }
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111
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112 /**
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113 * Method that updates the link to the parent in the array of specified new child nodes to this
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114 * node.
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115 *
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116 * @param newChildren the array of new children whose parent should be updated
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117 * @return the array of new children
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118 */
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119 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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120 if (newChildren != null) {
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121 for (T n : newChildren) {
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122 adoptChild(n);
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123 }
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124 }
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125 return newChildren;
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126 }
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127
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128 /**
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129 * Method that updates the link to the parent in the specified new child node to this node.
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130 *
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131 * @param newChild the new child whose parent should be updated
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132 * @return the new child
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133 */
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134 protected final <T extends Node> T adoptChild(T newChild) {
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135 if (newChild != null) {
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136 if (newChild == this) {
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137 throw new IllegalStateException("The parent of a node can never be the node itself.");
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138 }
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139 ((Node) newChild).parent = this;
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140 }
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141 return newChild;
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142 }
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143
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144 /**
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145 * Returns properties of this node interesting for debugging and can be overwritten by
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146 * subclasses to add their own custom properties.
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147 *
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148 * @return the properties as a key/value hash map
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149 */
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150 public Map<String, Object> getDebugProperties() {
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151 Map<String, Object> properties = new HashMap<>();
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152 return properties;
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153 }
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154
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155 /**
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156 * The current parent node of this node.
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157 *
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158 * @return the parent node
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159 */
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160 public final Node getParent() {
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161 return parent;
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162 }
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163
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164 /**
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165 * Replaces this node with another node. If there is a source section (see
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166 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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167 *
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168 * @param newNode the new node that is the replacement
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169 * @param reason a description of the reason for the replacement
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170 * @return the new node
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171 */
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172 @SuppressWarnings({"unchecked"})
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173 public final <T extends Node> T replace(T newNode, String reason) {
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174 if (this.getParent() == null) {
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175 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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176 }
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177 if (sourceSection != null && newNode.getSourceSection() == null) {
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178 // Pass on the source section to the new node.
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179 newNode.assignSourceSection(sourceSection);
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180 }
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181 onReplace(newNode, reason);
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182 return (T) this.getParent().replaceChild(this, newNode);
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183 }
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184
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185 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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186 NodeUtil.replaceChild(this, oldChild, newChild);
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187 adoptChild(newChild);
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188 return newChild;
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189 }
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190
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191 /**
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192 * Replaces this node with another node. If there is a source section (see
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193 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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194 *
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195 * @param newNode the new node that is the replacement
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196 * @return the new node
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197 */
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198 public final <T extends Node> T replace(T newNode) {
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199 return replace(newNode, "");
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200 }
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201
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202 /**
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203 * Checks if this node is properly adopted by a parent and can be replaced.
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204 *
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205 * @return {@code true} if it is safe to replace this node.
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206 */
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207 public final boolean isReplaceable() {
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208 if (getParent() != null) {
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209 for (Node sibling : getParent().getChildren()) {
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210 if (sibling == this) {
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211 return true;
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212 }
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213 }
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214 }
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215 return false;
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216 }
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217
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218 /**
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219 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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220 * node is rewritten. This method is invoked before the actual replace has happened.
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221 *
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222 * @param newNode the replacement node
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223 * @param reason the reason the replace supplied
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224 */
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225 protected void onReplace(Node newNode, String reason) {
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226 RootNode rootNode = NodeUtil.findParent(this, RootNode.class);
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227 if (rootNode != null) {
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228 if (rootNode.getCallTarget() instanceof ReplaceObserver) {
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229 ((ReplaceObserver) rootNode.getCallTarget()).nodeReplaced();
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230 }
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231 }
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232 if (TruffleOptions.TraceRewrites) {
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233 Class<? extends Node> from = getClass();
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234 Class<? extends Node> to = newNode.getClass();
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235
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236 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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237 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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238 return;
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239 }
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240 }
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241
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242 if (TruffleOptions.TraceRewritesFilterToKind != null) {
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243 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
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244 return;
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245 }
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246 }
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247
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diff changeset
248 String filter = TruffleOptions.TraceRewritesFilterClass;
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249 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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250 return;
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251 }
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diff changeset
252
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253 // CheckStyle: stop system..print check
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diff changeset
254 System.out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
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255 // CheckStyle: resume system..print check
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diff changeset
256 }
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diff changeset
257 }
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diff changeset
258
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diff changeset
259 private static String formatNodeInfo(Class<? extends Node> clazz) {
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260 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
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261 String kind = "?";
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diff changeset
262 if (nodeInfo != null) {
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diff changeset
263 switch (nodeInfo.kind()) {
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diff changeset
264 case GENERIC:
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diff changeset
265 kind = "G";
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diff changeset
266 break;
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diff changeset
267 case SPECIALIZED:
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diff changeset
268 kind = "S";
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diff changeset
269 break;
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diff changeset
270 case UNINITIALIZED:
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diff changeset
271 kind = "U";
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diff changeset
272 break;
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diff changeset
273 case POLYMORPHIC:
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274 kind = "P";
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275 break;
10590
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diff changeset
276 default:
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diff changeset
277 kind = "?";
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diff changeset
278 break;
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diff changeset
279 }
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diff changeset
280 }
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diff changeset
281 return kind + " " + clazz.getSimpleName();
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diff changeset
282 }
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diff changeset
283
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diff changeset
284 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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diff changeset
285 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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diff changeset
286 if (info != null) {
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diff changeset
287 return info.kind() != kind;
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diff changeset
288 }
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diff changeset
289 return true;
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diff changeset
290 }
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diff changeset
291
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diff changeset
292 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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diff changeset
293 Class<?> currentFrom = from;
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diff changeset
294 while (currentFrom != null) {
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diff changeset
295 if (currentFrom.getName().contains(filter)) {
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diff changeset
296 return false;
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diff changeset
297 }
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diff changeset
298 currentFrom = currentFrom.getSuperclass();
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diff changeset
299 }
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diff changeset
300 return true;
9782
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diff changeset
301 }
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
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diff changeset
302
ba02d19dd3cc Added an onReplace method to Node to provide a way for a guest language implementation to use replace tracing.
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diff changeset
303 /**
7530
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304 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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diff changeset
305 * child nodes.
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diff changeset
306 *
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307 * @param nodeVisitor the visitor
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parents:
diff changeset
308 */
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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parents:
diff changeset
309 public final void accept(NodeVisitor nodeVisitor) {
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parents:
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310 if (nodeVisitor.visit(this)) {
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311 for (Node child : this.getChildren()) {
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312 if (child != null) {
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313 child.accept(nodeVisitor);
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314 }
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315 }
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316 }
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317 }
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318
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319 /**
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320 * Iterator over the children of this node.
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321 *
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322 * @return the iterator
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323 */
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324 public final Iterable<Node> getChildren() {
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325 final Node node = this;
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326 return new Iterable<Node>() {
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327
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328 public Iterator<Node> iterator() {
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329 return new NodeUtil.NodeIterator(node);
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330 }
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331 };
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332 }
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333
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334 /**
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335 * Creates a shallow copy of this node.
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336 *
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337 * @return the new copy
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338 */
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339 public Node copy() {
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340 try {
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341 return (Node) super.clone();
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342 } catch (CloneNotSupportedException e) {
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343 return null;
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344 }
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345 }
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346
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347 /**
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348 * This method must never be called. It enforces that {@link Object#clone} is not directly
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349 * called by subclasses. Use the {@link #copy()} method instead.
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350 */
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351 @Override
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352 @Deprecated
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353 protected final Object clone() throws CloneNotSupportedException {
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354 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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355 }
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356
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357 /**
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358 * Converts this node to a textual representation useful for debugging.
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359 */
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360 @Override
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361 public String toString() {
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362 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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363 Map<String, Object> properties = getDebugProperties();
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364 boolean hasProperties = false;
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365 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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366 sb.append(hasProperties ? "," : "<");
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367 hasProperties = true;
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368 sb.append(entry.getKey()).append("=").append(entry.getValue());
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369 }
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370 if (hasProperties) {
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371 sb.append(">");
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372 }
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373 sb.append("@").append(Integer.toHexString(hashCode()));
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374 return sb.toString();
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375 }
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376 }