Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 15372:2cea065e419d
Truffle: print the source section in the rewrite trace.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Thu, 24 Apr 2014 23:29:28 +0100 |
parents | 1cd02b4d90d1 |
children | dd624471bd30 |
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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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Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.nodes; |
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26 |
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27 import java.io.*; |
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28 import java.lang.annotation.*; |
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29 import java.util.*; |
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30 import java.util.concurrent.*; |
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31 |
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32 import com.oracle.truffle.api.*; |
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33 |
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34 /** |
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35 * Abstract base class for all Truffle nodes. |
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36 */ |
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37 public abstract class Node implements Cloneable { |
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38 |
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39 private Node parent; |
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40 |
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41 private SourceSection sourceSection; |
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42 |
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43 /** |
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44 * Marks array fields that are children of this node. |
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45 */ |
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46 @Retention(RetentionPolicy.RUNTIME) |
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47 @Target({ElementType.FIELD}) |
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48 public @interface Children { |
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49 } |
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50 |
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51 /** |
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52 * Marks fields that represent child nodes of this node. |
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53 */ |
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54 @Retention(RetentionPolicy.RUNTIME) |
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55 @Target({ElementType.FIELD}) |
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56 public @interface Child { |
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57 } |
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58 |
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59 protected Node() { |
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60 CompilerAsserts.neverPartOfCompilation(); |
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61 } |
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62 |
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63 protected Node(SourceSection sourceSection) { |
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64 CompilerAsserts.neverPartOfCompilation(); |
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65 this.sourceSection = sourceSection; |
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66 } |
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67 |
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68 /** |
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69 * Assigns a link to a guest language source section to this node. |
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70 * |
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71 * @param section the object representing a section in guest language source code |
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72 */ |
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73 public final void assignSourceSection(SourceSection section) { |
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74 if (sourceSection != null) { |
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75 // Patch this test during the transition to constructor-based |
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76 // source attribution, which would otherwise trigger this |
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77 // exception. This method will eventually be deprecated. |
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78 if (getSourceSection() != section) { |
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79 throw new IllegalStateException("Source section is already assigned. Old: " + getSourceSection() + ", new: " + section); |
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80 } |
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81 } |
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82 this.sourceSection = section; |
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83 } |
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84 |
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85 /** |
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86 * Returns a rough estimate for the cost of this {@link Node}. This estimate can be used by |
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87 * runtime systems or guest languages to implement heuristics based on Truffle ASTs. This method |
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88 * is intended to be overridden by subclasses. The default implementation returns the value of |
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89 * {@link NodeInfo#cost()} of the {@link NodeInfo} annotation declared at the subclass. If no |
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90 * {@link NodeInfo} annotation is declared the method returns {@link NodeCost#MONOMORPHIC} as a |
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91 * default value. |
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92 */ |
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93 public NodeCost getCost() { |
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94 NodeInfo info = getClass().getAnnotation(NodeInfo.class); |
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95 if (info != null) { |
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96 return info.cost(); |
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97 } |
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98 return NodeCost.MONOMORPHIC; |
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99 } |
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100 |
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101 /** |
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102 * Clears any previously assigned guest language source code from this node. |
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103 */ |
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104 public final void clearSourceSection() { |
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105 this.sourceSection = null; |
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106 } |
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107 |
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108 /** |
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109 * Retrieves the guest language source code section that is currently assigned to this node. |
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110 * |
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111 * @return the assigned source code section |
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112 */ |
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113 public final SourceSection getSourceSection() { |
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114 return sourceSection; |
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115 } |
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116 |
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117 /** |
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118 * Retrieves the guest language source code section that is currently assigned to this node. |
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119 * |
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120 * @return the assigned source code section |
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121 */ |
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122 @CompilerDirectives.SlowPath |
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123 public final SourceSection getEncapsulatingSourceSection() { |
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124 if (sourceSection == null && getParent() != null) { |
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125 return getParent().getEncapsulatingSourceSection(); |
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126 } |
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127 return sourceSection; |
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128 } |
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129 |
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130 /** |
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131 * Method that updates the link to the parent in the array of specified new child nodes to this |
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132 * node. |
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133 * |
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134 * @param newChildren the array of new children whose parent should be updated |
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135 * @return the array of new children |
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136 */ |
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137 @SuppressWarnings("static-method") |
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138 @Deprecated |
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139 protected final <T extends Node> T[] adoptChildren(final T[] newChildren) { |
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140 return newChildren; |
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141 } |
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142 |
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143 /** |
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144 * Method that updates the link to the parent in the specified new child node to this node. |
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145 * |
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146 * @param newChild the new child whose parent should be updated |
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147 * @return the new child |
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148 */ |
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149 @SuppressWarnings("static-method") |
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150 @Deprecated |
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151 protected final <T extends Node> T adoptChild(final T newChild) { |
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152 return newChild; |
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153 } |
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154 |
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155 /** |
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156 * Method that updates the link to the parent in the array of specified new child nodes to this |
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157 * node. |
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158 * |
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159 * @param newChildren the array of new children whose parent should be updated |
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160 * @return the array of new children |
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161 */ |
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162 protected final <T extends Node> T[] insert(final T[] newChildren) { |
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163 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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164 assert newChildren != null; |
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165 for (Node newChild : newChildren) { |
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166 adoptHelper(newChild); |
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167 } |
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168 return newChildren; |
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169 } |
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170 |
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171 /** |
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172 * Method that updates the link to the parent in the specified new child node to this node. |
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173 * |
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174 * @param newChild the new child whose parent should be updated |
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175 * @return the new child |
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176 */ |
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177 protected final <T extends Node> T insert(final T newChild) { |
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178 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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179 assert newChild != null; |
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180 adoptHelper(newChild); |
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181 return newChild; |
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182 } |
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183 |
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184 public final void adoptChildren() { |
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185 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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186 adoptHelper(); |
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187 } |
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188 |
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189 private void adoptHelper(final Node newChild) { |
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190 assert newChild != null; |
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191 if (newChild == this) { |
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192 throw new IllegalStateException("The parent of a node can never be the node itself."); |
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193 } |
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194 boolean isInserted = newChild.parent == null; |
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195 newChild.parent = this; |
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196 newChild.adoptHelper(); |
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197 if (isInserted) { |
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198 newChild.onAdopt(); |
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199 } |
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200 } |
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201 |
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202 private void adoptHelper() { |
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203 Iterable<Node> children = this.getChildren(); |
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204 for (Node child : children) { |
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205 if (child != null && child.getParent() != this) { |
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206 this.adoptHelper(child); |
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207 } |
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208 } |
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209 } |
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210 |
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211 private void adoptUnadoptedHelper(final Node newChild) { |
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212 assert newChild != null; |
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213 if (newChild == this) { |
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214 throw new IllegalStateException("The parent of a node can never be the node itself."); |
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215 } |
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216 boolean isInserted = newChild.parent == null; |
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217 newChild.parent = this; |
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218 newChild.adoptUnadoptedHelper(); |
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219 if (isInserted) { |
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220 newChild.onAdopt(); |
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221 } |
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222 } |
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223 |
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224 private void adoptUnadoptedHelper() { |
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225 Iterable<Node> children = this.getChildren(); |
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226 for (Node child : children) { |
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227 if (child != null && child.getParent() == null) { |
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228 this.adoptUnadoptedHelper(child); |
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229 } |
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230 } |
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231 } |
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232 |
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233 /** |
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234 * Returns properties of this node interesting for debugging and can be overwritten by |
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235 * subclasses to add their own custom properties. |
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236 * |
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237 * @return the properties as a key/value hash map |
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238 */ |
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239 public Map<String, Object> getDebugProperties() { |
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240 Map<String, Object> properties = new HashMap<>(); |
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241 return properties; |
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242 } |
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243 |
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244 /** |
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245 * The current parent node of this node. |
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246 * |
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247 * @return the parent node |
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248 */ |
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249 public final Node getParent() { |
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250 return parent; |
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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 * @param reason a description of the reason for the replacement |
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259 * @return the new node |
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260 */ |
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261 public final <T extends Node> T replace(final T newNode, final CharSequence reason) { |
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262 CompilerDirectives.transferToInterpreterAndInvalidate(); |
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263 atomic(new Runnable() { |
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264 public void run() { |
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265 replaceHelper(newNode, reason); |
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266 } |
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267 }); |
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268 return newNode; |
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269 } |
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270 |
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271 /** |
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272 * Replaces this node with another node. If there is a source section (see |
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273 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node. |
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274 * |
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275 * @param newNode the new node that is the replacement |
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276 * @return the new node |
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277 */ |
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278 public final <T extends Node> T replace(T newNode) { |
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279 return replace(newNode, ""); |
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280 } |
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281 |
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282 private void replaceHelper(Node newNode, CharSequence reason) { |
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283 CompilerAsserts.neverPartOfCompilation(); |
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284 if (this.getParent() == null) { |
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285 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent."); |
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286 } |
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287 if (sourceSection != null && newNode.getSourceSection() == null) { |
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288 // Pass on the source section to the new node. |
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289 newNode.assignSourceSection(sourceSection); |
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290 } |
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291 // (aw) need to set parent *before* replace, so that (unsynchronized) getRootNode() |
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292 // will always find the root node |
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293 newNode.parent = this.parent; |
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294 if (NodeUtil.replaceChild(this.parent, this, newNode)) { |
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295 this.parent.adoptHelper(newNode); |
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296 } else { |
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297 this.parent.adoptUnadoptedHelper(newNode); |
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298 } |
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299 reportReplace(this, newNode, reason); |
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300 onReplace(newNode, reason); |
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301 } |
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302 |
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Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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303 /** |
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304 * Checks if this node is properly adopted by a parent and can be replaced. |
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305 * |
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306 * @return {@code true} if it is safe to replace this node. |
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307 */ |
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308 public final boolean isReplaceable() { |
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309 if (getParent() != null) { |
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310 for (Node sibling : getParent().getChildren()) { |
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311 if (sibling == this) { |
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312 return true; |
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313 } |
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314 } |
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315 } |
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316 return false; |
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317 } |
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318 |
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319 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) { |
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320 RootNode rootNode = getRootNode(); |
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321 if (rootNode != null) { |
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322 CallTarget target = rootNode.getCallTarget(); |
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323 if (target instanceof ReplaceObserver) { |
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324 ((ReplaceObserver) target).nodeReplaced(oldNode, newNode, reason); |
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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 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the |
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331 * node is rewritten. This method is invoked before the actual replace has happened. |
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332 * |
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333 * @param newNode the replacement node |
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334 * @param reason the reason the replace supplied |
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335 */ |
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336 protected void onReplace(Node newNode, CharSequence reason) { |
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337 if (TruffleOptions.TraceRewrites) { |
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338 traceRewrite(newNode, reason); |
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339 } |
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340 } |
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341 |
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342 private void traceRewrite(Node newNode, CharSequence reason) { |
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343 if (TruffleOptions.TraceRewritesFilterFromCost != null) { |
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344 if (filterByKind(this, TruffleOptions.TraceRewritesFilterFromCost)) { |
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345 return; |
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346 } |
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347 } |
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348 |
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349 if (TruffleOptions.TraceRewritesFilterToCost != null) { |
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350 if (filterByKind(newNode, TruffleOptions.TraceRewritesFilterToCost)) { |
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351 return; |
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352 } |
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353 } |
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354 |
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355 String filter = TruffleOptions.TraceRewritesFilterClass; |
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356 Class<? extends Node> from = getClass(); |
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357 Class<? extends Node> to = newNode.getClass(); |
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358 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) { |
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359 return; |
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360 } |
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361 |
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362 final SourceSection reportedSourceSection = getEncapsulatingSourceSection(); |
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363 |
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364 PrintStream out = System.out; |
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365 out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s%s%n", this.toString(), formatNodeInfo(this), formatNodeInfo(newNode), reason != null && reason.length() > 0 ? reason |
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366 : "unknown", reportedSourceSection != null ? " at " + reportedSourceSection.getShortDescription() : ""); |
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367 } |
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368 |
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369 /** |
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370 * Subclasses of {@link Node} can implement this method to execute extra functionality when a |
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371 * node is effectively inserted into the AST. The {@code onAdopt} callback is called after the |
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372 * node has been effectively inserted, and it is guaranteed to be called only once for any given |
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373 * node. |
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374 */ |
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375 protected void onAdopt() { |
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376 // empty default |
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377 } |
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378 |
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379 private static String formatNodeInfo(Node node) { |
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380 String cost = "?"; |
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381 switch (node.getCost()) { |
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382 case NONE: |
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383 cost = "G"; |
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384 break; |
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385 case MONOMORPHIC: |
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386 cost = "M"; |
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387 break; |
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388 case POLYMORPHIC: |
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389 cost = "P"; |
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390 break; |
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391 case MEGAMORPHIC: |
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392 cost = "G"; |
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393 break; |
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394 default: |
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395 cost = "?"; |
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396 break; |
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397 } |
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398 return cost + " " + node.getClass().getSimpleName(); |
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399 } |
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400 |
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401 private static boolean filterByKind(Node node, NodeCost cost) { |
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402 return node.getCost() == cost; |
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403 } |
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404 |
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405 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) { |
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406 Class<?> currentFrom = from; |
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407 while (currentFrom != null) { |
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408 if (currentFrom.getName().contains(filter)) { |
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409 return false; |
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410 } |
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411 currentFrom = currentFrom.getSuperclass(); |
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412 } |
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413 return true; |
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414 } |
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415 |
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416 /** |
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417 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all |
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418 * child nodes. |
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419 * |
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420 * @param nodeVisitor the visitor |
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421 */ |
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422 public final void accept(NodeVisitor nodeVisitor) { |
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423 if (nodeVisitor.visit(this)) { |
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424 for (Node child : this.getChildren()) { |
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425 if (child != null) { |
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426 child.accept(nodeVisitor); |
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427 } |
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428 } |
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429 } |
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430 } |
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431 |
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432 /** |
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433 * Iterator over the children of this node. |
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434 * |
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435 * @return the iterator |
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436 */ |
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437 public final Iterable<Node> getChildren() { |
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438 final Node node = this; |
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439 return new Iterable<Node>() { |
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440 |
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441 public Iterator<Node> iterator() { |
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442 return new NodeUtil.NodeIterator(node); |
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443 } |
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444 }; |
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445 } |
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446 |
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447 /** |
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448 * Creates a shallow copy of this node. |
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449 * |
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450 * @return the new copy |
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451 */ |
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452 public Node copy() { |
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453 try { |
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454 return (Node) super.clone(); |
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455 } catch (CloneNotSupportedException e) { |
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456 return null; |
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457 } |
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458 } |
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459 |
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460 /** |
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461 * This method must never be called. It enforces that {@link Object#clone} is not directly |
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462 * called by subclasses. Use the {@link #copy()} method instead. |
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463 */ |
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464 @Override |
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465 @Deprecated |
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466 protected final Object clone() throws CloneNotSupportedException { |
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467 throw new IllegalStateException("This method should never be called, use the copy method instead!"); |
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468 } |
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469 |
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470 /** |
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471 * Get the root node of the tree a node belongs to. |
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472 * |
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473 * @return the {@link RootNode} or {@code null} if there is none. |
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474 */ |
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475 public final RootNode getRootNode() { |
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476 Node rootNode = this; |
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477 while (rootNode.getParent() != null) { |
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478 assert !(rootNode instanceof RootNode) : "root node must not have a parent"; |
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479 rootNode = rootNode.getParent(); |
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480 } |
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481 if (rootNode instanceof RootNode) { |
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482 return (RootNode) rootNode; |
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483 } |
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484 return null; |
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485 } |
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486 |
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487 /** |
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488 * Converts this node to a textual representation useful for debugging. |
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489 */ |
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490 @Override |
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491 public String toString() { |
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492 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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493 Map<String, Object> properties = getDebugProperties(); |
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494 boolean hasProperties = false; |
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495 for (Map.Entry<String, Object> entry : properties.entrySet()) { |
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496 sb.append(hasProperties ? "," : "<"); |
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497 hasProperties = true; |
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498 sb.append(entry.getKey()).append("=").append(entry.getValue()); |
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499 } |
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500 if (hasProperties) { |
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501 sb.append(">"); |
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502 } |
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503 sb.append("@").append(Integer.toHexString(hashCode())); |
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504 return sb.toString(); |
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505 } |
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506 |
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507 public final void atomic(Runnable closure) { |
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508 RootNode rootNode = getRootNode(); |
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509 if (rootNode != null) { |
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510 synchronized (rootNode) { |
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511 closure.run(); |
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512 } |
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513 } else { |
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514 closure.run(); |
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515 } |
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516 } |
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517 |
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518 public final <T> T atomic(Callable<T> closure) { |
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519 try { |
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520 RootNode rootNode = getRootNode(); |
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521 if (rootNode != null) { |
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522 synchronized (rootNode) { |
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523 return closure.call(); |
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524 } |
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525 } else { |
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526 return closure.call(); |
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527 } |
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528 } catch (RuntimeException e) { |
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529 throw e; |
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530 } catch (Exception e) { |
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531 throw new RuntimeException(e); |
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532 } |
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533 } |
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534 } |