Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 9484:2b663d5893d3
Allow rounding errors in probabilities
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Wed, 01 May 2013 13:33:07 -0700 |
parents | 9640bb930327 |
children | ba02d19dd3cc |
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, 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.
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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.
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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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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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7 * published by 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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8 * |
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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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9 * 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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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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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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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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12 * 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.
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13 * 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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14 * |
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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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15 * 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.
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16 * 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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17 * 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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18 * |
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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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.api.nodes; |
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24 |
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25 import java.lang.annotation.*; |
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26 import java.util.*; |
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27 |
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28 import com.oracle.truffle.api.*; |
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29 |
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30 /** |
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31 * Abstract base class for all Truffle nodes. |
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32 */ |
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33 public abstract class Node implements Cloneable { |
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34 |
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35 /** |
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36 * Utility constant representing an empty node array. |
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37 */ |
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38 public static final Node[] EMPTY_ARRAY = new Node[0]; |
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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 /** |
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61 * Assigns a link to a guest language source section to this node. |
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62 * |
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63 * @param section the object representing a section in guest language source code |
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64 */ |
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65 public final void assignSourceSection(SourceSection section) { |
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66 if (sourceSection != null) { |
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67 throw new IllegalStateException("Source section is already assigned."); |
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68 } |
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69 this.sourceSection = section; |
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70 } |
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71 |
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72 /** |
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73 * Clears any previously assigned guest language source code from this node. |
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74 */ |
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75 public final void clearSourceSection() { |
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76 this.sourceSection = null; |
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77 } |
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78 |
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79 /** |
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80 * Retrieves the guest language source code section that is currently assigned to this node. |
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81 * |
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82 * @return the assigned source code section |
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83 */ |
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84 public final SourceSection getSourceSection() { |
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85 return sourceSection; |
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86 } |
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87 |
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88 /** |
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89 * Method that updates the link to the parent in the array of specified new child nodes to this |
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90 * node. |
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91 * |
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92 * @param newChildren the array of new children whose parent should be updated |
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93 * @return the array of new children |
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94 */ |
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95 protected final <T extends Node> T[] adoptChildren(T[] newChildren) { |
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96 if (newChildren != null) { |
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97 for (T n : newChildren) { |
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98 adoptChild(n); |
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99 } |
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100 } |
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101 return newChildren; |
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102 } |
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103 |
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104 /** |
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105 * Method that updates the link to the parent in the specified new child node to this node. |
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106 * |
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107 * @param newChild the new child whose parent should be updated |
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108 * @return the new child |
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109 */ |
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110 protected final <T extends Node> T adoptChild(T newChild) { |
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111 if (newChild != null) { |
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112 ((Node) newChild).parent = this; |
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113 } |
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114 return newChild; |
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115 } |
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116 |
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117 /** |
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118 * Returns properties of this node interesting for debugging and can be overwritten by |
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119 * subclasses to add their own custom properties. |
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120 * |
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121 * @return the properties as a key/value hash map |
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122 */ |
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123 public Map<String, Object> getDebugProperties() { |
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124 Map<String, Object> properties = new HashMap<>(); |
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125 return properties; |
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126 } |
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127 |
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128 /** |
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129 * The current parent node of this node. |
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130 * |
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131 * @return the parent node |
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132 */ |
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133 public final Node getParent() { |
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134 return parent; |
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135 } |
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136 |
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137 /** |
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138 * Replaces this node with another node. If there is a source section (see |
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139 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node. |
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140 * |
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141 * @param newNode the new node that is the replacement |
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142 * @param reason a description of the reason for the replacement |
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143 * @return the new node |
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144 */ |
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145 @SuppressWarnings({"unchecked"}) |
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146 public final <T extends Node> T replace(T newNode, String reason) { |
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147 assert this.getParent() != null; |
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148 if (sourceSection != null) { |
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149 // Pass on the source section to the new node. |
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150 newNode.assignSourceSection(sourceSection); |
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151 } |
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152 return (T) this.getParent().replaceChild(this, newNode); |
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153 } |
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154 |
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155 private <T extends Node> T replaceChild(T oldChild, T newChild) { |
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156 NodeUtil.replaceChild(this, oldChild, newChild); |
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157 adoptChild(newChild); |
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158 return newChild; |
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159 } |
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160 |
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161 /** |
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162 * Replaces this node with another node. If there is a source section (see |
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163 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node. |
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164 * |
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165 * @param newNode the new node that is the replacement |
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166 * @return the new node |
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167 */ |
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168 public final <T extends Node> T replace(T newNode) { |
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169 return replace(newNode, ""); |
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170 } |
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171 |
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172 /** |
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173 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all |
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174 * child nodes. |
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175 * |
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176 * @param nodeVisitor the visitor |
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177 */ |
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178 public final void accept(NodeVisitor nodeVisitor) { |
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179 if (nodeVisitor.visit(this)) { |
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180 for (Node child : this.getChildren()) { |
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181 if (child != null) { |
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182 child.accept(nodeVisitor); |
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183 } |
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184 } |
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185 } |
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186 } |
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187 |
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188 /** |
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189 * Iterator over the children of this node. |
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190 * |
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191 * @return the iterator |
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192 */ |
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193 public final Iterable<Node> getChildren() { |
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194 final Node node = this; |
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195 return new Iterable<Node>() { |
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196 |
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197 public Iterator<Node> iterator() { |
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198 return new NodeUtil.NodeIterator(node); |
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199 } |
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200 }; |
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201 } |
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202 |
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203 /** |
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204 * Creates a shallow copy of this node. |
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205 * |
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206 * @return the new copy |
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207 */ |
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208 public Node copy() { |
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209 try { |
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210 return (Node) super.clone(); |
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211 } catch (CloneNotSupportedException e) { |
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212 return null; |
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213 } |
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214 } |
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215 |
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216 /** |
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217 * This method must never be called. It enforces that {@link Object#clone} is not directly |
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218 * called by subclasses. Use the {@link #copy()} method instead. |
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219 */ |
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220 @Override |
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221 @Deprecated |
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222 protected final Object clone() throws CloneNotSupportedException { |
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223 throw new IllegalStateException("This method should never be called, use the copy method instead!"); |
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224 } |
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225 |
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226 /** |
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227 * Converts this node to a textual representation useful for debugging. |
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228 */ |
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229 @Override |
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230 public String toString() { |
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231 StringBuilder sb = new StringBuilder(getClass().getSimpleName()); |
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232 Map<String, Object> properties = getDebugProperties(); |
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233 boolean hasProperties = false; |
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234 for (Map.Entry<String, Object> entry : properties.entrySet()) { |
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235 sb.append(hasProperties ? "," : "<"); |
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236 hasProperties = true; |
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237 sb.append(entry.getKey()).append("=").append(entry.getValue()); |
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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>
parents:
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238 } |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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239 if (hasProperties) { |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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240 sb.append(">"); |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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241 } |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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242 sb.append("@").append(Integer.toHexString(hashCode())); |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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243 return sb.toString(); |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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244 } |
a4b84ba6dc2e
Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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245 } |