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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 11535:8f0fb0ade839

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Truffle: add alternate Node/RootNode constructors with SourceSection argument.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Thu, 05 Sep 2013 15:03:36 -0700
parents 494b818b527c
children 5f532ea846fb
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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
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30 import com.oracle.truffle.api.*;
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31 import com.oracle.truffle.api.nodes.NodeInfo.Kind;
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32
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33 /**
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34 * Abstract base class for all Truffle nodes.
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35 */
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36 public abstract class Node implements Cloneable {
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37
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38 private Node parent;
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39
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40 private SourceSection sourceSection;
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41
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42 /**
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43 * Marks array fields that are children of this node.
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44 */
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45 @Retention(RetentionPolicy.RUNTIME)
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46 @Target({ElementType.FIELD})
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47 public @interface Children {
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48 }
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49
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50 /**
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51 * Marks fields that represent child nodes of this node.
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52 */
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53 @Retention(RetentionPolicy.RUNTIME)
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54 @Target({ElementType.FIELD})
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55 public @interface Child {
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56 }
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57
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58 protected Node() {
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59 CompilerAsserts.neverPartOfCompilation();
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60 }
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61
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62 protected Node(SourceSection sourceSection) {
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63 CompilerAsserts.neverPartOfCompilation();
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64 this.sourceSection = sourceSection;
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65 }
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66
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67 /**
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68 * Assigns a link to a guest language source section to this node.
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69 *
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70 * @param section the object representing a section in guest language source code
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71 */
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72 public final void assignSourceSection(SourceSection section) {
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73 if (sourceSection != null) {
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74 throw new IllegalStateException("Source section is already assigned.");
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75 }
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76 this.sourceSection = section;
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77 }
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79 /**
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80 * Clears any previously assigned guest language source code from this node.
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81 */
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82 public final void clearSourceSection() {
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83 this.sourceSection = null;
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84 }
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86 /**
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87 * Retrieves the guest language source code section that is currently assigned to this node.
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88 *
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89 * @return the assigned source code section
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90 */
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91 public final SourceSection getSourceSection() {
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92 return sourceSection;
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93 }
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94
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95 /**
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96 * Retrieves the guest language source code section that is currently assigned to this node.
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97 *
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98 * @return the assigned source code section
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99 */
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100 public final SourceSection getEncapsulatingSourceSection() {
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101 if (sourceSection == null && getParent() != null) {
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102 return getParent().getEncapsulatingSourceSection();
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103 }
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104 return sourceSection;
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105 }
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106
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107 /**
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108 * Method that updates the link to the parent in the array of specified new child nodes to this
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109 * node.
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110 *
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111 * @param newChildren the array of new children whose parent should be updated
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112 * @return the array of new children
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113 */
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114 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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115 if (newChildren != null) {
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116 for (T n : newChildren) {
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117 adoptChild(n);
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118 }
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119 }
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120 return newChildren;
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121 }
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122
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123 /**
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124 * Method that updates the link to the parent in the specified new child node to this node.
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125 *
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126 * @param newChild the new child whose parent should be updated
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127 * @return the new child
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128 */
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129 protected final <T extends Node> T adoptChild(T newChild) {
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130 if (newChild != null) {
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131 if (newChild == this) {
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132 throw new IllegalStateException("The parent of a node can never be the node itself.");
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133 }
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134 ((Node) newChild).parent = this;
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135 }
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136 return newChild;
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137 }
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138
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139 /**
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140 * Returns properties of this node interesting for debugging and can be overwritten by
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141 * subclasses to add their own custom properties.
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142 *
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143 * @return the properties as a key/value hash map
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144 */
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145 public Map<String, Object> getDebugProperties() {
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146 Map<String, Object> properties = new HashMap<>();
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147 return properties;
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148 }
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149
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150 /**
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151 * The current parent node of this node.
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152 *
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153 * @return the parent node
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154 */
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155 public final Node getParent() {
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156 return parent;
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157 }
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158
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159 /**
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160 * Replaces this node with another node. If there is a source section (see
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161 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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162 *
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163 * @param newNode the new node that is the replacement
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164 * @param reason a description of the reason for the replacement
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165 * @return the new node
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166 */
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167 @SuppressWarnings({"unchecked"})
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168 public final <T extends Node> T replace(T newNode, String reason) {
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169 if (this.getParent() == null) {
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170 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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171 }
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172 if (sourceSection != null) {
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173 // Pass on the source section to the new node.
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174 newNode.assignSourceSection(sourceSection);
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175 }
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176 onReplace(newNode, reason);
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177 return (T) this.getParent().replaceChild(this, newNode);
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178 }
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179
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180 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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181 NodeUtil.replaceChild(this, oldChild, newChild);
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182 adoptChild(newChild);
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183 return newChild;
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184 }
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185
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186 /**
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187 * Replaces this node with another node. If there is a source section (see
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188 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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189 *
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190 * @param newNode the new node that is the replacement
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191 * @return the new node
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192 */
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193 public final <T extends Node> T replace(T newNode) {
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194 return replace(newNode, "");
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195 }
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196
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197 /**
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198 * Checks if this node is properly adopted by a parent and can be replaced.
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199 *
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200 * @return {@code true} if it is safe to replace this node.
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201 */
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202 public final boolean isReplaceable() {
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203 if (getParent() != null) {
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204 for (Node sibling : getParent().getChildren()) {
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205 if (sibling == this) {
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206 return true;
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207 }
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208 }
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209 }
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210 return false;
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211 }
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212
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213 /**
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214 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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215 * node is rewritten. This method is invoked before the actual replace has happened.
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216 *
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217 * @param newNode the replacement node
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218 * @param reason the reason the replace supplied
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219 */
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220 protected void onReplace(Node newNode, String reason) {
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221 RootNode rootNode = NodeUtil.findParent(this, RootNode.class);
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222 if (rootNode != null) {
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223 if (rootNode.getCallTarget() instanceof ReplaceObserver) {
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224 ((ReplaceObserver) rootNode.getCallTarget()).nodeReplaced();
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225 }
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226 }
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227 if (TruffleOptions.TraceRewrites) {
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228 Class<? extends Node> from = getClass();
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229 Class<? extends Node> to = newNode.getClass();
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230
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231 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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232 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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233 return;
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234 }
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235 }
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236
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237 if (TruffleOptions.TraceRewritesFilterToKind != null) {
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238 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
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239 return;
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240 }
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241 }
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242
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243 String filter = TruffleOptions.TraceRewritesFilterClass;
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244 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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245 return;
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246 }
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diff changeset
247
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248 // CheckStyle: stop system..print check
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249 System.out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
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250 // CheckStyle: resume system..print check
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251 }
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252 }
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253
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254 private static String formatNodeInfo(Class<? extends Node> clazz) {
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255 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
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256 String kind = "?";
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diff changeset
257 if (nodeInfo != null) {
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diff changeset
258 switch (nodeInfo.kind()) {
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diff changeset
259 case GENERIC:
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260 kind = "G";
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diff changeset
261 break;
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diff changeset
262 case SPECIALIZED:
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263 kind = "S";
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264 break;
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diff changeset
265 case UNINITIALIZED:
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266 kind = "U";
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diff changeset
267 break;
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268 case POLYMORPHIC:
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269 kind = "P";
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270 break;
10590
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diff changeset
271 default:
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272 kind = "?";
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diff changeset
273 break;
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diff changeset
274 }
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275 }
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276 return kind + " " + clazz.getSimpleName();
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277 }
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278
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279 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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280 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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281 if (info != null) {
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282 return info.kind() != kind;
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diff changeset
283 }
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diff changeset
284 return true;
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diff changeset
285 }
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diff changeset
286
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287 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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288 Class<?> currentFrom = from;
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diff changeset
289 while (currentFrom != null) {
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diff changeset
290 if (currentFrom.getName().contains(filter)) {
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diff changeset
291 return false;
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diff changeset
292 }
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diff changeset
293 currentFrom = currentFrom.getSuperclass();
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diff changeset
294 }
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diff changeset
295 return true;
9782
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296 }
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297
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diff changeset
298 /**
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299 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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diff changeset
300 * child nodes.
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diff changeset
301 *
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302 * @param nodeVisitor the visitor
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diff changeset
303 */
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304 public final void accept(NodeVisitor nodeVisitor) {
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diff changeset
305 if (nodeVisitor.visit(this)) {
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diff changeset
306 for (Node child : this.getChildren()) {
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diff changeset
307 if (child != null) {
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diff changeset
308 child.accept(nodeVisitor);
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309 }
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310 }
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311 }
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312 }
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313
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314 /**
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315 * Iterator over the children of this node.
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316 *
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317 * @return the iterator
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318 */
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319 public final Iterable<Node> getChildren() {
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320 final Node node = this;
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321 return new Iterable<Node>() {
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322
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323 public Iterator<Node> iterator() {
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324 return new NodeUtil.NodeIterator(node);
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325 }
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326 };
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327 }
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328
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329 /**
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330 * Creates a shallow copy of this node.
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331 *
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332 * @return the new copy
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333 */
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334 public Node copy() {
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335 try {
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336 return (Node) super.clone();
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337 } catch (CloneNotSupportedException e) {
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338 return null;
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339 }
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340 }
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341
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342 /**
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343 * This method must never be called. It enforces that {@link Object#clone} is not directly
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344 * called by subclasses. Use the {@link #copy()} method instead.
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345 */
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346 @Override
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347 @Deprecated
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348 protected final Object clone() throws CloneNotSupportedException {
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349 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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350 }
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351
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352 /**
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353 * Converts this node to a textual representation useful for debugging.
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354 */
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355 @Override
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356 public String toString() {
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357 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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358 Map<String, Object> properties = getDebugProperties();
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359 boolean hasProperties = false;
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360 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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361 sb.append(hasProperties ? "," : "<");
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362 hasProperties = true;
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363 sb.append(entry.getKey()).append("=").append(entry.getValue());
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364 }
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365 if (hasProperties) {
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366 sb.append(">");
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367 }
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368 sb.append("@").append(Integer.toHexString(hashCode()));
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369 return sb.toString();
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370 }
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371 }