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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 16464:76081918079d

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Truffle: move TraceRewrites code to NodeUtil
author Andreas Woess <andreas.woess@jku.at>
date Thu, 10 Jul 2014 18:08:29 +0200
parents 76895499bc88
children 17f7331dcc4f
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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.lang.annotation.*;
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28 import java.util.*;
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29 import java.util.concurrent.*;
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30
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31 import com.oracle.truffle.api.*;
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32 import com.oracle.truffle.api.source.*;
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33 import com.oracle.truffle.api.utilities.*;
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34
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35 /**
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36 * Abstract base class for all Truffle nodes.
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37 */
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38 public abstract class Node implements Cloneable {
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39
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40 private Node parent;
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41
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42 private SourceSection sourceSection;
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43
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44 /**
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45 * Marks array fields that are children of this node.
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46 */
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47 @Retention(RetentionPolicy.RUNTIME)
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48 @Target({ElementType.FIELD})
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49 public @interface Children {
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50 }
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51
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52 /**
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53 * Marks fields that represent child nodes of this node.
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54 */
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55 @Retention(RetentionPolicy.RUNTIME)
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56 @Target({ElementType.FIELD})
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57 public @interface Child {
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58 }
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59
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60 protected Node() {
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61 this(null);
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62 }
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63
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64 protected Node(SourceSection sourceSection) {
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65 CompilerAsserts.neverPartOfCompilation();
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66 this.sourceSection = sourceSection;
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67 if (TruffleOptions.TraceASTJSON) {
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68 JSONHelper.dumpNewNode(this);
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69 }
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70 }
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71
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72 /**
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73 * Assigns a link to a guest language source section to this node.
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74 *
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75 * @param section the object representing a section in guest language source code
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76 */
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77 public final void assignSourceSection(SourceSection section) {
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78 if (sourceSection != null) {
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79 // Patch this test during the transition to constructor-based
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80 // source attribution, which would otherwise trigger this
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81 // exception. This method will eventually be deprecated.
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82 if (getSourceSection() != section) {
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83 throw new IllegalStateException("Source section is already assigned. Old: " + getSourceSection() + ", new: " + section);
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84 }
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85 }
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86 this.sourceSection = section;
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87 }
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88
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89 /**
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90 * Returns a rough estimate for the cost of this {@link Node}. This estimate can be used by
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91 * runtime systems or guest languages to implement heuristics based on Truffle ASTs. This method
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92 * is intended to be overridden by subclasses. The default implementation returns the value of
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93 * {@link NodeInfo#cost()} of the {@link NodeInfo} annotation declared at the subclass. If no
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94 * {@link NodeInfo} annotation is declared the method returns {@link NodeCost#MONOMORPHIC} as a
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95 * default value.
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96 */
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97 public NodeCost getCost() {
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98 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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99 if (info != null) {
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100 return info.cost();
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101 }
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102 return NodeCost.MONOMORPHIC;
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103 }
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104
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105 /**
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106 * Clears any previously assigned guest language source code from this node.
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107 */
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108 public final void clearSourceSection() {
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109 this.sourceSection = null;
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110 }
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111
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112 /**
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113 * Retrieves the guest language source code section that is currently assigned to this node.
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114 *
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115 * @return the assigned source code section
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116 */
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117 public final SourceSection getSourceSection() {
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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 * Retrieves the guest language source code section that is currently assigned to this node.
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123 *
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124 * @return the assigned source code section
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125 */
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126 @CompilerDirectives.SlowPath
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127 public final SourceSection getEncapsulatingSourceSection() {
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128 if (sourceSection == null && getParent() != null) {
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129 return getParent().getEncapsulatingSourceSection();
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130 }
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131 return sourceSection;
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132 }
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133
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134 /**
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135 * Method that updates the link to the parent in the array of specified new child nodes to this
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136 * node.
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137 *
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138 * @param newChildren the array of new children whose parent should be updated
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139 * @return the array of new children
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140 */
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141 protected final <T extends Node> T[] insert(final T[] newChildren) {
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142 CompilerDirectives.transferToInterpreterAndInvalidate();
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143 assert newChildren != null;
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144 for (Node newChild : newChildren) {
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145 adoptHelper(newChild);
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146 }
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147 return newChildren;
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148 }
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149
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150 /**
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151 * Method that updates the link to the parent in the specified new child node to this node.
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152 *
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153 * @param newChild the new child whose parent should be updated
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154 * @return the new child
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155 */
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156 protected final <T extends Node> T insert(final T newChild) {
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157 CompilerDirectives.transferToInterpreterAndInvalidate();
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158 assert newChild != null;
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159 adoptHelper(newChild);
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160 return newChild;
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161 }
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162
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163 public final void adoptChildren() {
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164 CompilerDirectives.transferToInterpreterAndInvalidate();
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165 adoptHelper();
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166 }
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167
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168 private void adoptHelper(final Node newChild) {
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169 assert newChild != null;
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170 if (newChild == this) {
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171 throw new IllegalStateException("The parent of a node can never be the node itself.");
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172 }
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173 boolean isInserted = newChild.parent == null;
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174 newChild.parent = this;
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175 if (TruffleOptions.TraceASTJSON) {
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176 JSONHelper.dumpNewChild(this, newChild);
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177 }
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178 newChild.adoptHelper();
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179 if (isInserted) {
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180 newChild.onAdopt();
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181 }
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182 }
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183
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184 private void adoptHelper() {
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185 Iterable<Node> children = this.getChildren();
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186 for (Node child : children) {
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187 if (child != null && child.getParent() != this) {
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188 this.adoptHelper(child);
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189 }
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190 }
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191 }
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192
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193 private void adoptUnadoptedHelper(final Node newChild) {
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194 assert newChild != null;
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195 if (newChild == this) {
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196 throw new IllegalStateException("The parent of a node can never be the node itself.");
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197 }
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198 boolean isInserted = newChild.parent == null;
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199 newChild.parent = this;
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200 newChild.adoptUnadoptedHelper();
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201 if (isInserted) {
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202 newChild.onAdopt();
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203 }
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204 }
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205
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206 private void adoptUnadoptedHelper() {
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207 Iterable<Node> children = this.getChildren();
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208 for (Node child : children) {
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209 if (child != null && child.getParent() == null) {
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210 this.adoptUnadoptedHelper(child);
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211 }
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212 }
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213 }
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214
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215 /**
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216 * Returns properties of this node interesting for debugging and can be overwritten by
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217 * subclasses to add their own custom properties.
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218 *
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219 * @return the properties as a key/value hash map
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220 */
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221 public Map<String, Object> getDebugProperties() {
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222 Map<String, Object> properties = new HashMap<>();
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223 return properties;
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224 }
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225
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226 /**
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227 * The current parent node of this node.
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228 *
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229 * @return the parent node
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230 */
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231 public final Node getParent() {
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232 return parent;
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233 }
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234
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235 /**
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236 * Replaces this node with another node. If there is a source section (see
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237 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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238 *
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239 * @param newNode the new node that is the replacement
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240 * @param reason a description of the reason for the replacement
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241 * @return the new node
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242 */
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243 public final <T extends Node> T replace(final T newNode, final CharSequence reason) {
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244 CompilerDirectives.transferToInterpreterAndInvalidate();
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245 atomic(new Runnable() {
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246 public void run() {
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247 replaceHelper(newNode, reason);
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248 }
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249 });
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250 return newNode;
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251 }
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252
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253 /**
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254 * Replaces this node with another node. If there is a source section (see
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255 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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256 *
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257 * @param newNode the new node that is the replacement
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258 * @return the new node
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259 */
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260 public final <T extends Node> T replace(T newNode) {
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261 return replace(newNode, "");
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262 }
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263
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264 private void replaceHelper(Node newNode, CharSequence reason) {
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265 CompilerAsserts.neverPartOfCompilation();
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266 if (this.getParent() == null) {
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267 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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268 }
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269 if (sourceSection != null && newNode.getSourceSection() == null) {
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270 // Pass on the source section to the new node.
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271 newNode.assignSourceSection(sourceSection);
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272 }
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273 // (aw) need to set parent *before* replace, so that (unsynchronized) getRootNode()
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274 // will always find the root node
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275 newNode.parent = this.parent;
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276 if (NodeUtil.replaceChild(this.parent, this, newNode)) {
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277 this.parent.adoptHelper(newNode);
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278 } else {
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279 this.parent.adoptUnadoptedHelper(newNode);
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280 }
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281 reportReplace(this, newNode, reason);
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282 onReplace(newNode, reason);
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283 }
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284
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285 /**
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286 * Checks if this node is properly adopted by a parent and can be replaced.
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287 *
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288 * @return {@code true} if it is safe to replace this node.
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289 */
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290 public final boolean isReplaceable() {
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291 if (getParent() != null) {
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292 for (Node sibling : getParent().getChildren()) {
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293 if (sibling == this) {
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294 return true;
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295 }
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296 }
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297 }
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298 return false;
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299 }
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300
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301 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) {
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302 RootNode rootNode = getRootNode();
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303 if (rootNode != null) {
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304 CallTarget target = rootNode.getCallTarget();
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305 if (target instanceof ReplaceObserver) {
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306 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason);
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307 }
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308 }
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309 if (TruffleOptions.TraceRewrites) {
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310 NodeUtil.traceRewrite(this, newNode, reason);
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311 }
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312 if (TruffleOptions.TraceASTJSON) {
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313 JSONHelper.dumpReplaceChild(this, newNode, reason);
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314 }
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315 }
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316
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317 /**
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318 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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319 * node is rewritten. This method is invoked before the actual replace has happened.
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320 *
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321 * @param newNode the replacement node
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322 * @param reason the reason the replace supplied
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323 */
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324 protected void onReplace(Node newNode, CharSequence reason) {
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325 // empty default
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326 }
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327
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328 /**
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329 * Subclasses of {@link Node} can implement this method to execute extra functionality when a
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330 * node is effectively inserted into the AST. The {@code onAdopt} callback is called after the
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331 * node has been effectively inserted, and it is guaranteed to be called only once for any given
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332 * node.
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333 */
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334 protected void onAdopt() {
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335 // empty default
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336 }
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337
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338 /**
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339 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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340 * child nodes.
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341 *
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342 * @param nodeVisitor the visitor
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343 */
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344 public final void accept(NodeVisitor nodeVisitor) {
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345 if (nodeVisitor.visit(this)) {
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346 for (Node child : this.getChildren()) {
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347 if (child != null) {
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348 child.accept(nodeVisitor);
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349 }
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350 }
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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 * Iterator over the children of this node.
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356 *
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357 * @return the iterator
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358 */
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359 public final Iterable<Node> getChildren() {
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360 final Node node = this;
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361 return new Iterable<Node>() {
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362
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363 public Iterator<Node> iterator() {
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364 return new NodeUtil.NodeIterator(node);
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365 }
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366 };
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367 }
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368
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369 /**
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370 * Creates a shallow copy of this node.
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371 *
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372 * @return the new copy
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373 */
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374 public Node copy() {
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375 try {
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376 return (Node) super.clone();
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377 } catch (CloneNotSupportedException e) {
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378 return null;
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379 }
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380 }
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381
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382 /**
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383 * This method must never be called. It enforces that {@link Object#clone} is not directly
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384 * called by subclasses. Use the {@link #copy()} method instead.
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385 */
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386 @Override
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387 @Deprecated
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388 protected final Object clone() throws CloneNotSupportedException {
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389 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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390 }
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391
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392 /**
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393 * Get the root node of the tree a node belongs to.
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394 *
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395 * @return the {@link RootNode} or {@code null} if there is none.
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396 */
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397 public final RootNode getRootNode() {
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398 Node rootNode = this;
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399 while (rootNode.getParent() != null) {
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400 assert !(rootNode instanceof RootNode) : "root node must not have a parent";
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401 rootNode = rootNode.getParent();
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402 }
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403 if (rootNode instanceof RootNode) {
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404 return (RootNode) rootNode;
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405 }
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406 return null;
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407 }
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408
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409 /**
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410 * Converts this node to a textual representation useful for debugging.
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411 */
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412 @Override
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413 public String toString() {
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414 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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415 Map<String, Object> properties = getDebugProperties();
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416 boolean hasProperties = false;
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417 for (Map.Entry<String, Object> entry : properties.entrySet()) {
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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418 sb.append(hasProperties ? "," : "<");
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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419 hasProperties = true;
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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420 sb.append(entry.getKey()).append("=").append(entry.getValue());
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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421 }
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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parents:
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422 if (hasProperties) {
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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423 sb.append(">");
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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424 }
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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425 sb.append("@").append(Integer.toHexString(hashCode()));
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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426 return sb.toString();
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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427 }
14629
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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428
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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429 public final void atomic(Runnable closure) {
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Andreas Woess <andreas.woess@jku.at>
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430 RootNode rootNode = getRootNode();
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Andreas Woess <andreas.woess@jku.at>
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431 if (rootNode != null) {
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Andreas Woess <andreas.woess@jku.at>
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432 synchronized (rootNode) {
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433 closure.run();
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434 }
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Andreas Woess <andreas.woess@jku.at>
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435 } else {
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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436 closure.run();
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Andreas Woess <andreas.woess@jku.at>
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437 }
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Andreas Woess <andreas.woess@jku.at>
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438 }
ba52fbec5b6c Truffle: atomic node rewriting
Andreas Woess <andreas.woess@jku.at>
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439
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440 public final <T> T atomic(Callable<T> closure) {
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441 try {
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442 RootNode rootNode = getRootNode();
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443 if (rootNode != null) {
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Andreas Woess <andreas.woess@jku.at>
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444 synchronized (rootNode) {
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445 return closure.call();
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446 }
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447 } else {
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448 return closure.call();
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449 }
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450 } catch (RuntimeException e) {
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451 throw e;
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452 } catch (Exception e) {
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453 throw new RuntimeException(e);
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454 }
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Andreas Woess <andreas.woess@jku.at>
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455 }
15775
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
456
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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diff changeset
457 /**
4293efaaab76 Add description and language to the NodeInfo annotation
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458 * Returns a user-readable description of the purpose of the Node, or "" if no description is
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459 * available.
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460 */
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461 public String getDescription() {
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462 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
4293efaaab76 Add description and language to the NodeInfo annotation
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463 if (info != null) {
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464 return info.description();
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465 }
4293efaaab76 Add description and language to the NodeInfo annotation
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466 return "";
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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467 }
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
468
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
469 /**
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
470 * Returns a string representing the language this node has been implemented for. If the
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
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471 * language is unknown, returns "".
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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472 */
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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473 public String getLanguage() {
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Christian Wirth <christian.wirth@oracle.com>
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diff changeset
474 NodeInfo info = getClass().getAnnotation(NodeInfo.class);
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Christian Wirth <christian.wirth@oracle.com>
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diff changeset
475 if (info != null && info.language() != null && info.language().length() > 0) {
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
476 return info.language();
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
477 }
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
478 if (parent != null) {
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
479 return parent.getLanguage();
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
480 }
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
481 return "";
4293efaaab76 Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
parents: 15474
diff changeset
482 }
7267
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
483 }