Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 16467:17f7331dcc4f
Truffle: move iterator to NodeClass
author | Andreas Woess <andreas.woess@jku.at> |
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date | Thu, 10 Jul 2014 18:08:29 +0200 |
parents | 76081918079d |
children | f8998c828bed |
rev | line source |
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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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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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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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4 * |
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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.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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5 * This code is free software; you can redistribute it and/or modify it |
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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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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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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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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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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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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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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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14 * version 2 for more details (a copy is included in the LICENSE file that |
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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.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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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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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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17 * You should have received a copy of the GNU General Public License version |
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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.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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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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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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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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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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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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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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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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25 package com.oracle.truffle.api.nodes; |
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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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26 |
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27 import java.lang.annotation.*; |
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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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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 return new Iterable<Node>() { |
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361 public Iterator<Node> iterator() { |
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362 return NodeUtil.makeIterator(Node.this); |
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363 } |
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364 }; |
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365 } |
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366 |
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367 /** |
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368 * Creates a shallow copy of this node. |
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369 * |
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370 * @return the new copy |
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371 */ |
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372 public Node copy() { |
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373 try { |
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374 return (Node) super.clone(); |
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375 } catch (CloneNotSupportedException e) { |
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376 return null; |
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377 } |
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378 } |
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379 |
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380 /** |
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381 * This method must never be called. It enforces that {@link Object#clone} is not directly |
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382 * called by subclasses. Use the {@link #copy()} method instead. |
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383 */ |
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384 @Override |
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385 @Deprecated |
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386 protected final Object clone() throws CloneNotSupportedException { |
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387 throw new IllegalStateException("This method should never be called, use the copy method instead!"); |
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388 } |
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389 |
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390 /** |
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391 * Get the root node of the tree a node belongs to. |
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392 * |
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393 * @return the {@link RootNode} or {@code null} if there is none. |
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394 */ |
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395 public final RootNode getRootNode() { |
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396 Node rootNode = this; |
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397 while (rootNode.getParent() != null) { |
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398 assert !(rootNode instanceof RootNode) : "root node must not have a parent"; |
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399 rootNode = rootNode.getParent(); |
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400 } |
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401 if (rootNode instanceof RootNode) { |
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402 return (RootNode) rootNode; |
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403 } |
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404 return null; |
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405 } |
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406 |
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407 /** |
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408 * Converts this node to a textual representation useful for debugging. |
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409 */ |
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410 @Override |
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411 public String toString() { |
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412 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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413 Map<String, Object> properties = getDebugProperties(); |
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414 boolean hasProperties = false; |
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415 for (Map.Entry<String, Object> entry : properties.entrySet()) { |
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416 sb.append(hasProperties ? "," : "<"); |
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417 hasProperties = true; |
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418 sb.append(entry.getKey()).append("=").append(entry.getValue()); |
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419 } |
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420 if (hasProperties) { |
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421 sb.append(">"); |
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422 } |
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423 sb.append("@").append(Integer.toHexString(hashCode())); |
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424 return sb.toString(); |
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425 } |
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426 |
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427 public final void atomic(Runnable closure) { |
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428 RootNode rootNode = getRootNode(); |
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429 if (rootNode != null) { |
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430 synchronized (rootNode) { |
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431 closure.run(); |
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432 } |
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433 } else { |
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434 closure.run(); |
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435 } |
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436 } |
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437 |
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438 public final <T> T atomic(Callable<T> closure) { |
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439 try { |
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440 RootNode rootNode = getRootNode(); |
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441 if (rootNode != null) { |
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442 synchronized (rootNode) { |
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443 return closure.call(); |
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444 } |
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445 } else { |
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446 return closure.call(); |
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447 } |
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448 } catch (RuntimeException e) { |
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449 throw e; |
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450 } catch (Exception e) { |
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451 throw new RuntimeException(e); |
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452 } |
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453 } |
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454 |
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455 /** |
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456 * Returns a user-readable description of the purpose of the Node, or "" if no description is |
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457 * available. |
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458 */ |
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459 public String getDescription() { |
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460 NodeInfo info = getClass().getAnnotation(NodeInfo.class); |
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461 if (info != null) { |
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462 return info.description(); |
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463 } |
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464 return ""; |
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465 } |
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466 |
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467 /** |
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468 * Returns a string representing the language this node has been implemented for. If the |
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469 * language is unknown, returns "". |
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470 */ |
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471 public String getLanguage() { |
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472 NodeInfo info = getClass().getAnnotation(NodeInfo.class); |
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473 if (info != null && info.language() != null && info.language().length() > 0) { |
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474 return info.language(); |
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475 } |
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476 if (parent != null) { |
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477 return parent.getLanguage(); |
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478 } |
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479 return ""; |
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Add description and language to the NodeInfo annotation
Christian Wirth <christian.wirth@oracle.com>
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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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481 } |