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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 10592:99b58803d6d9

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Truffle-DSL: API changes for new polymorphic caching feature.
author Christian Humer <christian.humer@gmail.com>
date Mon, 01 Jul 2013 20:24:49 +0200
parents 6eb8d63cea34
children 50f3f3958555
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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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24
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25 import java.lang.annotation.*;
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26 import java.util.*;
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27
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28 import com.oracle.truffle.api.*;
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29 import com.oracle.truffle.api.nodes.NodeInfo.Kind;
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31 /**
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32 * Abstract base class for all Truffle nodes.
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33 */
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34 public abstract class Node implements Cloneable {
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35
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36 /**
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37 * Utility constant representing an empty node array.
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38 */
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39 public static final Node[] EMPTY_ARRAY = new Node[0];
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40
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41 private Node parent;
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42
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43 private SourceSection sourceSection;
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44
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45 /**
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46 * Marks array fields that are children of this node.
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47 */
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48 @Retention(RetentionPolicy.RUNTIME)
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49 @Target({ElementType.FIELD})
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50 public @interface Children {
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51 }
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52
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53 /**
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54 * Marks fields that represent child nodes of this node.
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55 */
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56 @Retention(RetentionPolicy.RUNTIME)
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57 @Target({ElementType.FIELD})
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58 public @interface Child {
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59 }
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60
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61 protected Node() {
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62 CompilerAsserts.neverPartOfCompilation();
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63 }
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64
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65 /**
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66 * Assigns a link to a guest language source section to this node.
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67 *
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68 * @param section the object representing a section in guest language source code
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69 */
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70 public final void assignSourceSection(SourceSection section) {
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71 if (sourceSection != null) {
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72 throw new IllegalStateException("Source section is already assigned.");
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73 }
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74 this.sourceSection = section;
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75 }
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76
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77 /**
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78 * Clears any previously assigned guest language source code from this node.
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79 */
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80 public final void clearSourceSection() {
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81 this.sourceSection = null;
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82 }
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83
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84 /**
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85 * Retrieves the guest language source code section that is currently assigned to this node.
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86 *
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87 * @return the assigned source code section
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88 */
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89 public final SourceSection getSourceSection() {
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90 return sourceSection;
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91 }
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92
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93 /**
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94 * Retrieves the guest language source code section that is currently assigned to this node.
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95 *
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96 * @return the assigned source code section
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97 */
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98 public final SourceSection getEncapsulatingSourceSection() {
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99 if (sourceSection == null && getParent() != null) {
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100 return getParent().getEncapsulatingSourceSection();
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101 }
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102 return sourceSection;
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103 }
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104
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105 /**
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106 * Method that updates the link to the parent in the array of specified new child nodes to this
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107 * node.
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108 *
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109 * @param newChildren the array of new children whose parent should be updated
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110 * @return the array of new children
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111 */
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112 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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113 if (newChildren != null) {
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114 for (T n : newChildren) {
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115 adoptChild(n);
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116 }
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117 }
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118 return newChildren;
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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 specified new child node to this node.
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123 *
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124 * @param newChild the new child whose parent should be updated
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125 * @return the new child
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126 */
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127 protected final <T extends Node> T adoptChild(T newChild) {
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128 if (newChild != null) {
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129 if (newChild == this) {
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130 throw new IllegalStateException("The parent of a node can never be the node itself.");
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131 }
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132 ((Node) newChild).parent = this;
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133 }
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134 return newChild;
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135 }
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136
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137 /**
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138 * Returns properties of this node interesting for debugging and can be overwritten by
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139 * subclasses to add their own custom properties.
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140 *
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141 * @return the properties as a key/value hash map
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142 */
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143 public Map<String, Object> getDebugProperties() {
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144 Map<String, Object> properties = new HashMap<>();
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145 return properties;
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146 }
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147
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148 /**
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149 * The current parent node of this node.
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150 *
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151 * @return the parent node
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152 */
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153 public final Node getParent() {
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154 return parent;
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155 }
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156
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157 /**
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158 * Replaces this node with another node. If there is a source section (see
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159 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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160 *
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161 * @param newNode the new node that is the replacement
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162 * @param reason a description of the reason for the replacement
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163 * @return the new node
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164 */
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165 @SuppressWarnings({"unchecked"})
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166 public final <T extends Node> T replace(T newNode, String reason) {
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167 if (this.getParent() == null) {
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168 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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169 }
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170 if (sourceSection != null) {
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171 // Pass on the source section to the new node.
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172 newNode.assignSourceSection(sourceSection);
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173 }
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174 onReplace(newNode, reason);
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175 return (T) this.getParent().replaceChild(this, newNode);
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176 }
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177
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178 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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179 NodeUtil.replaceChild(this, oldChild, newChild);
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180 adoptChild(newChild);
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181 return newChild;
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182 }
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183
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184 /**
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185 * Replaces this node with another node. If there is a source section (see
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186 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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187 *
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188 * @param newNode the new node that is the replacement
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189 * @return the new node
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190 */
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191 public final <T extends Node> T replace(T newNode) {
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192 return replace(newNode, "");
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193 }
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194
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195 /**
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196 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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197 * node is rewritten. This method is invoked before the actual replace has happened.
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198 *
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199 * @param newNode the replacement node
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200 * @param reason the reason the replace supplied
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201 */
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202 protected void onReplace(Node newNode, String reason) {
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203 if (TruffleOptions.TraceRewrites) {
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204 Class<? extends Node> from = getClass();
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205 Class<? extends Node> to = newNode.getClass();
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206
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207 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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208 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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209 return;
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210 }
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211 }
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212
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213 if (TruffleOptions.TraceRewritesFilterToKind != null) {
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214 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
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215 return;
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216 }
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217 }
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218
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219 String filter = TruffleOptions.TraceRewritesFilterClass;
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220 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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221 return;
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222 }
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223
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224 // CheckStyle: stop system..print check
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225 System.out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
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226 // CheckStyle: resume system..print check
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227 }
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228 }
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229
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230 private static String formatNodeInfo(Class<? extends Node> clazz) {
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231 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
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232 String kind = "?";
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233 if (nodeInfo != null) {
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234 switch (nodeInfo.kind()) {
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235 case GENERIC:
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236 kind = "G";
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237 break;
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238 case SPECIALIZED:
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239 kind = "S";
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240 break;
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241 case UNINITIALIZED:
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242 kind = "U";
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243 break;
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244 case POLYMORPHIC:
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245 kind = "P";
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246 break;
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247 default:
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248 kind = "?";
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249 break;
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250 }
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251 }
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252 return kind + " " + clazz.getSimpleName();
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253 }
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254
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255 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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256 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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257 if (info != null) {
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258 return info.kind() != kind;
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259 }
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260 return true;
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261 }
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262
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263 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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264 Class<?> currentFrom = from;
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265 while (currentFrom != null) {
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266 if (currentFrom.getName().contains(filter)) {
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267 return false;
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268 }
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269 currentFrom = currentFrom.getSuperclass();
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270 }
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271 return true;
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272 }
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273
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274 /**
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275 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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276 * child nodes.
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277 *
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278 * @param nodeVisitor the visitor
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279 */
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280 public final void accept(NodeVisitor nodeVisitor) {
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281 if (nodeVisitor.visit(this)) {
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282 for (Node child : this.getChildren()) {
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283 if (child != null) {
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284 child.accept(nodeVisitor);
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285 }
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286 }
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287 }
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288 }
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289
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290 /**
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291 * Iterator over the children of this node.
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292 *
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293 * @return the iterator
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294 */
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295 public final Iterable<Node> getChildren() {
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296 final Node node = this;
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297 return new Iterable<Node>() {
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298
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299 public Iterator<Node> iterator() {
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300 return new NodeUtil.NodeIterator(node);
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301 }
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302 };
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303 }
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304
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305 /**
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306 * Creates a shallow copy of this node.
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307 *
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308 * @return the new copy
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309 */
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310 public Node copy() {
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311 try {
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312 return (Node) super.clone();
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313 } catch (CloneNotSupportedException e) {
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314 return null;
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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 * This method must never be called. It enforces that {@link Object#clone} is not directly
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320 * called by subclasses. Use the {@link #copy()} method instead.
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321 */
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322 @Override
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323 @Deprecated
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324 protected final Object clone() throws CloneNotSupportedException {
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325 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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326 }
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327
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328 /**
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329 * Converts this node to a textual representation useful for debugging.
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330 */
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331 @Override
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332 public String toString() {
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333 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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334 Map<String, Object> properties = getDebugProperties();
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335 boolean hasProperties = false;
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336 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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337 sb.append(hasProperties ? "," : "<");
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338 hasProperties = true;
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339 sb.append(entry.getKey()).append("=").append(entry.getValue());
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340 }
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341 if (hasProperties) {
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342 sb.append(">");
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343 }
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344 sb.append("@").append(Integer.toHexString(hashCode()));
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345 return sb.toString();
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346 }
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347 }