annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 14628:a08b8694f556

Truffle: Node API changes deprecate adoptChild, no longer needed in constructor add Node#insert for inserting new nodes into the tree (previously adoptChild) add Node#adoptChildren() helper method that adopts all (direct and indirect) children of a node, automatically called in TruffleRuntime#createCallTarget
author Andreas Woess <andreas.woess@jku.at>
date Wed, 19 Mar 2014 23:11:46 +0100
parents 6189c1983cd3
children ba52fbec5b6c
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1 /*
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.nodes;
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26
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27 import java.io.*;
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28 import java.lang.annotation.*;
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29 import java.util.*;
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30
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31 import com.oracle.truffle.api.*;
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32
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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 /**
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85 * Returns a rough estimate for the cost of this {@link Node}. This estimate can be used by
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86 * runtime systems or guest languages to implement heuristics based on Truffle ASTs. This method
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87 * is intended to be overridden by subclasses. The default implementation returns the value of
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88 * {@link NodeInfo#cost()} of the {@link NodeInfo} annotation declared at the subclass. If no
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89 * {@link NodeInfo} annotation is declared the method returns {@link NodeCost#MONOMORPHIC} as a
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90 * default value.
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91 */
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92 public NodeCost getCost() {
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93 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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94 if (info != null) {
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95 return info.cost();
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96 }
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97 return NodeCost.MONOMORPHIC;
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98 }
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99
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100 /**
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101 * Clears any previously assigned guest language source code from this node.
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102 */
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103 public final void clearSourceSection() {
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104 this.sourceSection = null;
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105 }
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106
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107 /**
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108 * Retrieves the guest language source code section that is currently assigned to this node.
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109 *
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110 * @return the assigned source code section
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111 */
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112 public final SourceSection getSourceSection() {
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113 return sourceSection;
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114 }
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115
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116 /**
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117 * Retrieves the guest language source code section that is currently assigned to this node.
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118 *
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119 * @return the assigned source code section
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120 */
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121 @CompilerDirectives.SlowPath
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122 public final SourceSection getEncapsulatingSourceSection() {
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123 if (sourceSection == null && getParent() != null) {
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124 return getParent().getEncapsulatingSourceSection();
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125 }
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126 return sourceSection;
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127 }
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128
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129 /**
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130 * Method that updates the link to the parent in the array of specified new child nodes to this
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131 * node.
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132 *
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133 * @param newChildren the array of new children whose parent should be updated
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134 * @return the array of new children
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135 */
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136 @SuppressWarnings("static-method")
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137 @Deprecated
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138 protected final <T extends Node> T[] adoptChildren(final T[] newChildren) {
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139 return newChildren;
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140 }
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141
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142 /**
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143 * Method that updates the link to the parent in the specified new child node to this node.
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144 *
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145 * @param newChild the new child whose parent should be updated
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146 * @return the new child
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147 */
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148 @SuppressWarnings("static-method")
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149 @Deprecated
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150 protected final <T extends Node> T adoptChild(final T newChild) {
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151 return newChild;
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152 }
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153
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154 /**
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155 * Method that updates the link to the parent in the array of specified new child nodes to this
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156 * node.
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157 *
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158 * @param newChildren the array of new children whose parent should be updated
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159 * @return the array of new children
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160 */
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161 protected final <T extends Node> T[] insert(final T[] newChildren) {
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162 CompilerDirectives.transferToInterpreterAndInvalidate();
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163 assert newChildren != null;
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164 for (Node newChild : newChildren) {
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165 adoptHelper(newChild);
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166 }
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167 return newChildren;
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168 }
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169
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170 /**
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171 * Method that updates the link to the parent in the specified new child node to this node.
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172 *
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173 * @param newChild the new child whose parent should be updated
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174 * @return the new child
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175 */
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176 protected final <T extends Node> T insert(final T newChild) {
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177 CompilerDirectives.transferToInterpreterAndInvalidate();
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178 assert newChild != null;
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179 adoptHelper(newChild);
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180 return newChild;
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181 }
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182
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183 public final void adoptChildren() {
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184 CompilerDirectives.transferToInterpreterAndInvalidate();
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185 adoptHelper();
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186 }
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187
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188 private void adoptHelper(final Node newChild) {
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189 assert newChild != null;
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190 if (newChild == this) {
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191 throw new IllegalStateException("The parent of a node can never be the node itself.");
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192 }
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193 newChild.parent = this;
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194 newChild.adoptHelper();
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195 }
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196
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197 private void adoptHelper() {
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198 Iterable<Node> children = this.getChildren();
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199 for (Node child : children) {
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200 if (child != null && child.getParent() != this) {
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201 this.adoptHelper(child);
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202 }
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203 }
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204 }
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205
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206 private void adoptUnadoptedHelper(final Node newChild) {
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207 assert newChild != null;
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208 if (newChild == this) {
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209 throw new IllegalStateException("The parent of a node can never be the node itself.");
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210 }
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211 newChild.parent = this;
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212 newChild.adoptUnadoptedHelper();
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213 }
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214
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215 private void adoptUnadoptedHelper() {
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216 Iterable<Node> children = this.getChildren();
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217 for (Node child : children) {
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218 if (child != null && child.getParent() == null) {
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219 this.adoptUnadoptedHelper(child);
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220 }
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221 }
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222 }
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223
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224 /**
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225 * Returns properties of this node interesting for debugging and can be overwritten by
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226 * subclasses to add their own custom properties.
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227 *
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228 * @return the properties as a key/value hash map
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229 */
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230 public Map<String, Object> getDebugProperties() {
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231 Map<String, Object> properties = new HashMap<>();
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232 return properties;
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233 }
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234
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235 /**
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236 * The current parent node of this node.
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237 *
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238 * @return the parent node
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239 */
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240 public final Node getParent() {
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241 return parent;
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242 }
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243
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244 /**
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245 * Replaces this node with another node. If there is a source section (see
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246 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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247 *
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248 * @param newNode the new node that is the replacement
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249 * @param reason a description of the reason for the replacement
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250 * @return the new node
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251 */
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252 public final <T extends Node> T replace(final T newNode, final CharSequence reason) {
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253 CompilerDirectives.transferToInterpreterAndInvalidate();
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254 replaceHelper(newNode, reason);
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255 return newNode;
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256 }
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257
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258 /**
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259 * Replaces this node with another node. If there is a source section (see
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260 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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261 *
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262 * @param newNode the new node that is the replacement
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263 * @return the new node
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264 */
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265 public final <T extends Node> T replace(T newNode) {
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266 return replace(newNode, "");
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267 }
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268
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269 private void replaceHelper(Node newNode, CharSequence reason) {
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270 CompilerAsserts.neverPartOfCompilation();
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271 if (this.getParent() == null) {
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272 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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273 }
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274 if (sourceSection != null && newNode.getSourceSection() == null) {
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275 // Pass on the source section to the new node.
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276 newNode.assignSourceSection(sourceSection);
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277 }
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278 // (aw) need to set parent *before* replace, so that (unsynchronized) getRootNode()
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279 // will always find the root node
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280 newNode.parent = this.parent;
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281 if (NodeUtil.replaceChild(this.parent, this, newNode)) {
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282 this.parent.adoptHelper(newNode);
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283 } else {
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284 this.parent.adoptUnadoptedHelper(newNode);
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285 }
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286 reportReplace(this, newNode, reason);
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287 onReplace(newNode, reason);
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288 }
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289
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290 /**
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291 * Checks if this node is properly adopted by a parent and can be replaced.
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292 *
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293 * @return {@code true} if it is safe to replace this node.
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294 */
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295 public final boolean isReplaceable() {
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296 if (getParent() != null) {
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297 for (Node sibling : getParent().getChildren()) {
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298 if (sibling == this) {
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299 return true;
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300 }
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301 }
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302 }
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303 return false;
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304 }
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305
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306 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) {
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307 RootNode rootNode = getRootNode();
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308 if (rootNode != null) {
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309 CallTarget target = rootNode.getCallTarget();
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310 if (target instanceof ReplaceObserver) {
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311 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason);
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312 }
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313 }
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314 }
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315
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316 /**
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317 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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318 * node is rewritten. This method is invoked before the actual replace has happened.
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319 *
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320 * @param newNode the replacement node
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321 * @param reason the reason the replace supplied
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322 */
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323 protected void onReplace(Node newNode, CharSequence reason) {
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324 if (TruffleOptions.TraceRewrites) {
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325 traceRewrite(newNode, reason);
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326 }
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327 }
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328
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329 private void traceRewrite(Node newNode, CharSequence reason) {
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330
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331 if (TruffleOptions.TraceRewritesFilterFromCost != null) {
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332 if (filterByKind(this, TruffleOptions.TraceRewritesFilterFromCost)) {
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333 return;
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334 }
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335 }
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336
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337 if (TruffleOptions.TraceRewritesFilterToCost != null) {
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338 if (filterByKind(newNode, TruffleOptions.TraceRewritesFilterToCost)) {
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339 return;
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340 }
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341 }
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342
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343 String filter = TruffleOptions.TraceRewritesFilterClass;
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344 Class<? extends Node> from = getClass();
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345 Class<? extends Node> to = newNode.getClass();
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346 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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347 return;
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348 }
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349
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350 PrintStream out = System.out;
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351 out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(this), formatNodeInfo(newNode), reason);
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352 }
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353
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354 private static String formatNodeInfo(Node node) {
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355 String cost = "?";
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356 switch (node.getCost()) {
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357 case NONE:
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358 cost = "G";
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359 break;
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360 case MONOMORPHIC:
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361 cost = "M";
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362 break;
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363 case POLYMORPHIC:
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364 cost = "P";
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365 break;
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366 case MEGAMORPHIC:
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367 cost = "G";
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368 break;
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369 default:
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370 cost = "?";
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371 break;
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372 }
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373 return cost + " " + node.getClass().getSimpleName();
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374 }
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375
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376 private static boolean filterByKind(Node node, NodeCost cost) {
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377 return node.getCost() == cost;
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378 }
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379
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380 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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381 Class<?> currentFrom = from;
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382 while (currentFrom != null) {
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383 if (currentFrom.getName().contains(filter)) {
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384 return false;
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385 }
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386 currentFrom = currentFrom.getSuperclass();
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387 }
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388 return true;
9782
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389 }
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
390
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
391 /**
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392 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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393 * child nodes.
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394 *
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395 * @param nodeVisitor the visitor
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396 */
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397 public final void accept(NodeVisitor nodeVisitor) {
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398 if (nodeVisitor.visit(this)) {
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399 for (Node child : this.getChildren()) {
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400 if (child != null) {
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401 child.accept(nodeVisitor);
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402 }
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403 }
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diff changeset
404 }
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405 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
406
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diff changeset
407 /**
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diff changeset
408 * Iterator over the children of this node.
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diff changeset
409 *
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410 * @return the iterator
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diff changeset
411 */
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diff changeset
412 public final Iterable<Node> getChildren() {
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diff changeset
413 final Node node = this;
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diff changeset
414 return new Iterable<Node>() {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
415
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diff changeset
416 public Iterator<Node> iterator() {
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417 return new NodeUtil.NodeIterator(node);
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diff changeset
418 }
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diff changeset
419 };
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420 }
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diff changeset
421
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422 /**
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diff changeset
423 * Creates a shallow copy of this node.
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diff changeset
424 *
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425 * @return the new copy
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426 */
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diff changeset
427 public Node copy() {
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diff changeset
428 try {
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429 return (Node) super.clone();
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430 } catch (CloneNotSupportedException e) {
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431 return null;
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432 }
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433 }
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434
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435 /**
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436 * This method must never be called. It enforces that {@link Object#clone} is not directly
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437 * called by subclasses. Use the {@link #copy()} method instead.
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438 */
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439 @Override
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440 @Deprecated
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441 protected final Object clone() throws CloneNotSupportedException {
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442 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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443 }
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444
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445 /**
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446 * Get the root node of the tree a node belongs to.
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447 *
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448 * @return the {@link RootNode} or {@code null} if there is none.
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449 */
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450 public final RootNode getRootNode() {
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451 Node rootNode = this;
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452 while (rootNode.getParent() != null) {
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453 assert !(rootNode instanceof RootNode) : "root node must not have a parent";
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454 rootNode = rootNode.getParent();
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455 }
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456 if (rootNode instanceof RootNode) {
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457 return (RootNode) rootNode;
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458 }
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459 return null;
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460 }
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461
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462 /**
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463 * Converts this node to a textual representation useful for debugging.
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464 */
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465 @Override
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466 public String toString() {
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467 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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468 Map<String, Object> properties = getDebugProperties();
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469 boolean hasProperties = false;
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470 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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471 sb.append(hasProperties ? "," : "<");
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472 hasProperties = true;
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473 sb.append(entry.getKey()).append("=").append(entry.getValue());
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474 }
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475 if (hasProperties) {
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476 sb.append(">");
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477 }
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478 sb.append("@").append(Integer.toHexString(hashCode()));
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479 return sb.toString();
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480 }
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481 }