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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeFieldAccessor.java @ 20130:8dc73c226c63
Truffle: cache NodeClass lookup in Node.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 02 Apr 2015 01:26:31 +0200 |
parents | 5b7db8941fd7 |
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1 /* |
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2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.nodes; |
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26 |
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27 import java.lang.reflect.*; |
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28 |
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29 import sun.misc.*; |
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30 |
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31 import com.oracle.truffle.api.nodes.Node.Child; |
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32 import com.oracle.truffle.api.nodes.Node.Children; |
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33 import com.oracle.truffle.api.nodes.NodeUtil.FieldOffsetProvider; |
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34 |
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35 /** |
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36 * Information about a field in a {@link Node} class. |
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37 */ |
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38 public abstract class NodeFieldAccessor { |
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39 |
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40 public static enum NodeFieldKind { |
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41 /** The reference to the {@link NodeClass}. */ |
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42 NODE_CLASS, |
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43 /** The single {@link Node#getParent() parent} field. */ |
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44 PARENT, |
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45 /** A field annotated with {@link Child}. */ |
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46 CHILD, |
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47 /** A field annotated with {@link Children}. */ |
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48 CHILDREN, |
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49 /** A normal non-child data field of the node. */ |
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50 DATA |
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51 } |
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52 |
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53 private static final boolean USE_UNSAFE = Boolean.getBoolean("truffle.unsafe"); |
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54 |
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55 private final NodeFieldKind kind; |
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56 private final String name; |
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57 protected final Class<?> type; |
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58 protected final long offset; |
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59 |
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60 protected NodeFieldAccessor(NodeFieldKind kind, Field field) { |
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61 this.kind = kind; |
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62 this.type = field.getType(); |
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63 this.name = field.getName(); |
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64 this.offset = unsafeFieldOffsetProvider.objectFieldOffset(field); |
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65 } |
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66 |
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67 protected static NodeFieldAccessor create(NodeFieldKind kind, Field field) { |
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68 if (USE_UNSAFE) { |
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69 return new UnsafeNodeField(kind, field); |
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70 } else { |
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71 return new ReflectionNodeField(kind, field); |
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72 } |
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73 } |
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74 |
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75 public NodeFieldKind getKind() { |
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76 return kind; |
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77 } |
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78 |
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79 public Class<?> getType() { |
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80 return type; |
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81 } |
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82 |
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83 public String getName() { |
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84 return name; |
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85 } |
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86 |
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87 public long getOffset() { |
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88 return offset; |
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89 } |
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90 |
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91 public abstract void putObject(Node receiver, Object value); |
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92 |
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93 public abstract Object getObject(Node receiver); |
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94 |
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95 public abstract Object loadValue(Node node); |
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96 |
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97 @Override |
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98 public int hashCode() { |
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99 return kind.hashCode() | type.hashCode() | name.hashCode() | ((Long) offset).hashCode(); |
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100 } |
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101 |
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102 @Override |
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103 public boolean equals(Object obj) { |
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104 if (obj instanceof NodeFieldAccessor) { |
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105 NodeFieldAccessor other = (NodeFieldAccessor) obj; |
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106 return offset == other.offset && name.equals(other.name) && type.equals(other.type) && kind.equals(other.kind); |
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107 } |
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108 return false; |
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109 } |
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110 |
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111 private static final Unsafe unsafe = getUnsafe(); |
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112 |
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113 private static Unsafe getUnsafe() { |
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114 try { |
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115 return Unsafe.getUnsafe(); |
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116 } catch (SecurityException e) { |
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117 } |
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118 try { |
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119 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe"); |
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120 theUnsafeInstance.setAccessible(true); |
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121 return (Unsafe) theUnsafeInstance.get(Unsafe.class); |
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122 } catch (Exception e) { |
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123 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e); |
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124 } |
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125 } |
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126 |
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127 private static final FieldOffsetProvider unsafeFieldOffsetProvider = new FieldOffsetProvider() { |
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128 |
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129 @Override |
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130 public long objectFieldOffset(Field field) { |
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131 return unsafe.objectFieldOffset(field); |
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132 } |
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133 |
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134 @Override |
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135 public int getTypeSize(Class<?> clazz) { |
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136 if (!clazz.isPrimitive()) { |
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137 return Unsafe.ARRAY_OBJECT_INDEX_SCALE; |
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138 } else if (clazz == int.class) { |
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139 return Unsafe.ARRAY_INT_INDEX_SCALE; |
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140 } else { |
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141 throw new UnsupportedOperationException("unsupported field type: " + clazz); |
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142 } |
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143 } |
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144 }; |
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145 |
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146 private static final class UnsafeNodeField extends NodeFieldAccessor { |
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147 |
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148 protected UnsafeNodeField(NodeFieldKind kind, Field field) { |
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149 super(kind, field); |
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150 } |
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151 |
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152 @Override |
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153 public void putObject(Node receiver, Object value) { |
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154 if (!type.isPrimitive() && value == null || type.isInstance(value)) { |
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155 unsafe.putObject(receiver, offset, value); |
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156 } else { |
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157 throw new IllegalArgumentException(); |
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158 } |
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159 } |
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160 |
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161 @Override |
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162 public Object getObject(Node receiver) { |
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163 if (!type.isPrimitive()) { |
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164 return unsafe.getObject(receiver, offset); |
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165 } else { |
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166 throw new IllegalArgumentException(); |
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167 } |
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168 } |
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169 |
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170 @Override |
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171 public Object loadValue(Node node) { |
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172 if (type == boolean.class) { |
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173 return unsafe.getBoolean(node, offset); |
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174 } else if (type == byte.class) { |
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175 return unsafe.getByte(node, offset); |
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176 } else if (type == short.class) { |
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177 return unsafe.getShort(node, offset); |
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178 } else if (type == char.class) { |
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179 return unsafe.getChar(node, offset); |
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180 } else if (type == int.class) { |
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181 return unsafe.getInt(node, offset); |
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182 } else if (type == long.class) { |
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183 return unsafe.getLong(node, offset); |
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184 } else if (type == float.class) { |
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185 return unsafe.getFloat(node, offset); |
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186 } else if (type == double.class) { |
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187 return unsafe.getDouble(node, offset); |
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188 } else { |
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189 return unsafe.getObject(node, offset); |
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190 } |
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191 } |
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192 } |
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193 |
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194 private static final class ReflectionNodeField extends NodeFieldAccessor { |
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195 private final Field field; |
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196 |
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197 protected ReflectionNodeField(NodeFieldKind kind, Field field) { |
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198 super(kind, field); |
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199 this.field = field; |
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200 field.setAccessible(true); |
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201 } |
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202 |
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203 @Override |
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204 public void putObject(Node receiver, Object value) { |
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205 assert !type.isPrimitive() && value == null || type.isInstance(value); |
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206 try { |
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207 field.set(receiver, value); |
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208 } catch (IllegalAccessException e) { |
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209 throw new AssertionError(e); |
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210 } |
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211 } |
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212 |
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213 @Override |
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214 public Object getObject(Node receiver) { |
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215 assert !type.isPrimitive(); |
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216 try { |
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217 return field.get(receiver); |
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218 } catch (IllegalAccessException e) { |
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219 throw new AssertionError(e); |
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220 } |
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221 } |
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222 |
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223 @Override |
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224 public Object loadValue(Node node) { |
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225 try { |
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226 if (type == boolean.class) { |
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227 return field.getBoolean(node); |
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228 } else if (type == byte.class) { |
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229 return field.getByte(node); |
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230 } else if (type == short.class) { |
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231 return field.getShort(node); |
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232 } else if (type == char.class) { |
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233 return field.getChar(node); |
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234 } else if (type == int.class) { |
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235 return field.getInt(node); |
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236 } else if (type == long.class) { |
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237 return field.getLong(node); |
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238 } else if (type == float.class) { |
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239 return field.getFloat(node); |
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240 } else if (type == double.class) { |
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241 return field.getDouble(node); |
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242 } else { |
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243 return field.get(node); |
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244 } |
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245 } catch (IllegalAccessException e) { |
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246 throw new AssertionError(e); |
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247 } |
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248 } |
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249 } |
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250 |
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251 } |