Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 14564:5d1308c78ddc
Truffle: Introduced NodeCost as a replacement for NodeInfo.Kind.
author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 17 Mar 2014 14:29:45 +0100 |
parents | c5411233cdf8 |
children | 6681b9eb3f4c |
rev | line source |
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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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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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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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14 * version 2 for more details (a copy is included in the LICENSE file that |
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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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15 * accompanied this code). |
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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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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 |
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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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83 |
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84 public NodeCost getCost() { |
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85 NodeInfo info = getClass().getAnnotation(NodeInfo.class); |
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86 if (info != null) { |
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87 return info.cost(); |
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88 } |
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89 return NodeCost.MONOMORPHIC; |
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90 } |
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91 |
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92 /** |
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93 * Clears any previously assigned guest language source code from this node. |
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94 */ |
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95 public final void clearSourceSection() { |
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96 this.sourceSection = null; |
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97 } |
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98 |
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99 /** |
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100 * Retrieves the guest language source code section that is currently assigned to this node. |
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101 * |
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102 * @return the assigned source code section |
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103 */ |
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104 public final SourceSection getSourceSection() { |
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105 return sourceSection; |
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106 } |
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107 |
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108 /** |
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109 * Retrieves the guest language source code section that is currently assigned to this node. |
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110 * |
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111 * @return the assigned source code section |
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112 */ |
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113 @CompilerDirectives.SlowPath |
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114 public final SourceSection getEncapsulatingSourceSection() { |
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115 if (sourceSection == null && getParent() != null) { |
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116 return getParent().getEncapsulatingSourceSection(); |
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117 } |
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118 return sourceSection; |
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119 } |
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120 |
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121 /** |
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122 * Method that updates the link to the parent in the array of specified new child nodes to this |
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123 * node. |
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124 * |
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125 * @param newChildren the array of new children whose parent should be updated |
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126 * @return the array of new children |
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127 */ |
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128 protected final <T extends Node> T[] adoptChildren(T[] newChildren) { |
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129 if (newChildren != null) { |
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130 for (T n : newChildren) { |
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131 adoptChild(n); |
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132 } |
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133 } |
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134 return newChildren; |
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135 } |
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136 |
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137 /** |
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138 * Method that updates the link to the parent in the specified new child node to this node. |
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139 * |
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140 * @param newChild the new child whose parent should be updated |
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141 * @return the new child |
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142 */ |
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143 protected final <T extends Node> T adoptChild(T newChild) { |
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144 if (newChild != null) { |
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145 if (newChild == this) { |
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146 throw new IllegalStateException("The parent of a node can never be the node itself."); |
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147 } |
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148 ((Node) newChild).parent = this; |
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149 } |
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150 return newChild; |
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151 } |
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152 |
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153 /** |
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154 * Returns properties of this node interesting for debugging and can be overwritten by |
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155 * subclasses to add their own custom properties. |
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156 * |
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157 * @return the properties as a key/value hash map |
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158 */ |
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159 public Map<String, Object> getDebugProperties() { |
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160 Map<String, Object> properties = new HashMap<>(); |
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161 return properties; |
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162 } |
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163 |
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164 /** |
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165 * The current parent node of this node. |
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166 * |
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167 * @return the parent node |
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168 */ |
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169 public final Node getParent() { |
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170 return parent; |
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171 } |
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172 |
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173 /** |
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174 * Replaces this node with another node. If there is a source section (see |
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175 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node. |
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176 * |
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177 * @param newNode the new node that is the replacement |
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178 * @param reason a description of the reason for the replacement |
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179 * @return the new node |
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180 */ |
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181 public final <T extends Node> T replace(T newNode, String reason) { |
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182 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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183 if (this.getParent() == null) { |
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184 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent."); |
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185 } |
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186 if (sourceSection != null && newNode.getSourceSection() == null) { |
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187 // Pass on the source section to the new node. |
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188 newNode.assignSourceSection(sourceSection); |
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189 } |
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190 onReplace(newNode, reason); |
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191 ((Node) newNode).parent = this.parent; |
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192 if (!NodeUtil.replaceChild(this.parent, this, newNode)) { |
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193 fixupTree(); |
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194 } |
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195 reportReplace(this, newNode, reason); |
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196 return newNode; |
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197 } |
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198 |
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199 /** |
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200 * Rewrite has failed; the tree is likely inconsistent, so fix any stale parent references. |
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201 * |
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202 * This is a rather expensive operation but rare to occur. |
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203 */ |
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204 private void fixupTree() { |
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205 Node rootNode = getRootNode(); |
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206 if (rootNode == null) { |
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207 throw new UnsupportedOperationException("Tree does not have a root node."); |
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208 } |
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209 int fixCount = rootNode.fixupChildren(); |
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210 assert fixCount != 0 : "sanity check failed: missing @Child[ren] or adoptChild?"; |
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211 // if nothing had to be fixed, rewrite failed due to node not being a proper child. |
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212 } |
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213 |
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214 private int fixupChildren() { |
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215 int fixCount = 0; |
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216 for (Node child : getChildren()) { |
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217 if (child != null) { |
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218 if (child.parent != this) { |
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219 child.parent = this; |
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220 fixCount++; |
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221 } |
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222 fixCount += child.fixupChildren(); |
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223 } |
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224 } |
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225 return fixCount; |
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226 } |
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227 |
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228 /** |
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229 * Replaces this node with another node. If there is a source section (see |
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230 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node. |
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231 * |
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232 * @param newNode the new node that is the replacement |
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233 * @return the new node |
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234 */ |
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235 public final <T extends Node> T replace(T newNode) { |
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236 return replace(newNode, ""); |
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237 } |
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238 |
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239 /** |
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240 * Checks if this node is properly adopted by a parent and can be replaced. |
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241 * |
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242 * @return {@code true} if it is safe to replace this node. |
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243 */ |
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244 public final boolean isReplaceable() { |
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245 if (getParent() != null) { |
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246 for (Node sibling : getParent().getChildren()) { |
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247 if (sibling == this) { |
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248 return true; |
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249 } |
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250 } |
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251 } |
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252 return false; |
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253 } |
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254 |
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255 private void reportReplace(Node oldNode, Node newNode, String reason) { |
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256 RootNode rootNode = getRootNode(); |
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257 if (rootNode != null) { |
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258 CallTarget target = rootNode.getCallTarget(); |
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259 if (target instanceof ReplaceObserver) { |
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260 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason); |
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261 } |
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262 } |
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263 } |
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264 |
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265 /** |
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266 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the |
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267 * node is rewritten. This method is invoked before the actual replace has happened. |
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268 * |
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269 * @param newNode the replacement node |
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270 * @param reason the reason the replace supplied |
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271 */ |
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272 protected void onReplace(Node newNode, String reason) { |
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273 if (TruffleOptions.TraceRewrites) { |
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274 traceRewrite(newNode, reason); |
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275 } |
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276 } |
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277 |
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278 private void traceRewrite(Node newNode, String reason) { |
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279 |
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280 if (TruffleOptions.TraceRewritesFilterFromCost != null) { |
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281 if (filterByKind(this, TruffleOptions.TraceRewritesFilterFromCost)) { |
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282 return; |
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283 } |
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284 } |
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285 |
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286 if (TruffleOptions.TraceRewritesFilterToCost != null) { |
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287 if (filterByKind(newNode, TruffleOptions.TraceRewritesFilterToCost)) { |
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288 return; |
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289 } |
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290 } |
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291 |
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292 String filter = TruffleOptions.TraceRewritesFilterClass; |
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293 Class<? extends Node> from = getClass(); |
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294 Class<? extends Node> to = newNode.getClass(); |
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295 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) { |
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296 return; |
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297 } |
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298 |
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299 PrintStream out = System.out; |
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300 out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(this), formatNodeInfo(newNode), reason); |
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301 } |
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302 |
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303 private static String formatNodeInfo(Node node) { |
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304 String cost = "?"; |
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305 switch (node.getCost()) { |
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306 case NONE: |
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307 cost = "G"; |
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308 break; |
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309 case MONOMORPHIC: |
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310 cost = "M"; |
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311 break; |
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312 case POLYMORPHIC: |
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313 cost = "P"; |
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314 break; |
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315 case MEGAMORPHIC: |
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316 cost = "G"; |
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317 break; |
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318 default: |
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319 cost = "?"; |
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320 break; |
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321 } |
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322 return cost + " " + node.getClass().getSimpleName(); |
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323 } |
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324 |
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325 private static boolean filterByKind(Node node, NodeCost cost) { |
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326 return node.getCost() == cost; |
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327 } |
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328 |
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329 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) { |
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330 Class<?> currentFrom = from; |
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331 while (currentFrom != null) { |
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332 if (currentFrom.getName().contains(filter)) { |
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333 return false; |
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334 } |
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335 currentFrom = currentFrom.getSuperclass(); |
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336 } |
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337 return true; |
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338 } |
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339 |
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340 /** |
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341 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all |
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342 * child nodes. |
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343 * |
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344 * @param nodeVisitor the visitor |
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345 */ |
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346 public final void accept(NodeVisitor nodeVisitor) { |
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347 if (nodeVisitor.visit(this)) { |
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348 for (Node child : this.getChildren()) { |
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349 if (child != null) { |
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350 child.accept(nodeVisitor); |
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351 } |
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352 } |
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353 } |
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354 } |
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355 |
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356 /** |
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357 * Iterator over the children of this node. |
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358 * |
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359 * @return the iterator |
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360 */ |
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361 public final Iterable<Node> getChildren() { |
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362 final Node node = this; |
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363 return new Iterable<Node>() { |
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364 |
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365 public Iterator<Node> iterator() { |
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366 return new NodeUtil.NodeIterator(node); |
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367 } |
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368 }; |
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369 } |
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370 |
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371 /** |
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372 * Creates a shallow copy of this node. |
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373 * |
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374 * @return the new copy |
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375 */ |
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376 public Node copy() { |
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377 try { |
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378 return (Node) super.clone(); |
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379 } catch (CloneNotSupportedException e) { |
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380 return null; |
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381 } |
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382 } |
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383 |
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384 /** |
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385 * This method must never be called. It enforces that {@link Object#clone} is not directly |
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386 * called by subclasses. Use the {@link #copy()} method instead. |
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387 */ |
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388 @Override |
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389 @Deprecated |
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390 protected final Object clone() throws CloneNotSupportedException { |
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391 throw new IllegalStateException("This method should never be called, use the copy method instead!"); |
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392 } |
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393 |
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394 /** |
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395 * Get the root node of the tree a node belongs to. |
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396 * |
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397 * @return the {@link RootNode} or {@code null} if there is none. |
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398 */ |
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399 public final RootNode getRootNode() { |
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400 Node rootNode = this; |
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401 while (rootNode.getParent() != null) { |
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402 assert !(rootNode instanceof RootNode) : "root node must not have a parent"; |
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403 rootNode = rootNode.getParent(); |
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404 } |
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405 if (rootNode instanceof RootNode) { |
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406 return (RootNode) rootNode; |
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407 } |
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408 return null; |
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409 } |
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410 |
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411 /** |
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412 * Converts this node to a textual representation useful for debugging. |
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413 */ |
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414 @Override |
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415 public String toString() { |
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416 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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417 Map<String, Object> properties = getDebugProperties(); |
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418 boolean hasProperties = false; |
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419 for (Map.Entry<String, Object> entry : properties.entrySet()) { |
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420 sb.append(hasProperties ? "," : "<"); |
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421 hasProperties = true; |
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422 sb.append(entry.getKey()).append("=").append(entry.getValue()); |
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423 } |
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424 if (hasProperties) { |
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425 sb.append(">"); |
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426 } |
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427 sb.append("@").append(Integer.toHexString(hashCode())); |
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428 return sb.toString(); |
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429 } |
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430 } |