Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeFieldAccessor.java @ 21967:08db96a633b9
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author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Mon, 22 Jun 2015 10:34:54 -0700 |
parents | 0103d237f6c3 |
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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 Class<?> declaringClass; |
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57 private final String name; |
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58 protected final Class<?> type; |
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59 /* TODO: This field should be moved to UnsafeNodeField. */ |
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60 protected final long offset; |
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61 |
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62 protected NodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClass, String name, Class<?> type, long offset) { |
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63 this.kind = kind; |
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64 this.declaringClass = declaringClass; |
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65 this.name = name; |
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66 this.type = type; |
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67 this.offset = offset; |
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68 } |
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69 |
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70 protected static NodeFieldAccessor create(NodeFieldKind kind, Field field) { |
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71 if (USE_UNSAFE) { |
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72 return new UnsafeNodeField(kind, field); |
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73 } else { |
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74 return new ReflectionNodeField(kind, field); |
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75 } |
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76 } |
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77 |
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78 public NodeFieldKind getKind() { |
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79 return kind; |
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80 } |
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81 |
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82 public Class<?> getType() { |
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83 return type; |
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84 } |
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85 |
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86 public Class<?> getDeclaringClass() { |
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87 return declaringClass; |
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88 } |
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89 |
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90 public String getName() { |
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91 return name; |
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92 } |
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93 |
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94 /* |
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95 * TODO: This method should be removed from here. It should be an abstract method in |
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96 * AbstractUnsafeNodeFieldAccessor, and implemented in UnsafeNodeField. |
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97 */ |
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98 public long getOffset() { |
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99 return offset; |
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100 } |
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101 |
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102 public abstract void putObject(Node receiver, Object value); |
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103 |
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104 public abstract Object getObject(Node receiver); |
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105 |
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106 public abstract Object loadValue(Node node); |
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107 |
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108 private static final Unsafe unsafe = getUnsafe(); |
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109 |
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110 private static Unsafe getUnsafe() { |
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111 try { |
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112 return Unsafe.getUnsafe(); |
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113 } catch (SecurityException e) { |
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114 } |
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115 try { |
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116 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe"); |
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117 theUnsafeInstance.setAccessible(true); |
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118 return (Unsafe) theUnsafeInstance.get(Unsafe.class); |
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119 } catch (Exception e) { |
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120 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e); |
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121 } |
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122 } |
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123 |
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124 private static final FieldOffsetProvider unsafeFieldOffsetProvider = new FieldOffsetProvider() { |
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125 |
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126 @Override |
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127 public long objectFieldOffset(Field field) { |
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128 return unsafe.objectFieldOffset(field); |
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129 } |
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130 |
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131 @Override |
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132 public int getTypeSize(Class<?> clazz) { |
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133 if (!clazz.isPrimitive()) { |
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134 return Unsafe.ARRAY_OBJECT_INDEX_SCALE; |
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135 } else if (clazz == int.class) { |
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136 return Unsafe.ARRAY_INT_INDEX_SCALE; |
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137 } else { |
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138 throw new UnsupportedOperationException("unsupported field type: " + clazz); |
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139 } |
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140 } |
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141 }; |
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142 |
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143 public abstract static class AbstractUnsafeNodeFieldAccessor extends NodeFieldAccessor { |
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144 |
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145 protected AbstractUnsafeNodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClas, String name, Class<?> type, long offset) { |
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146 super(kind, declaringClas, name, type, offset); |
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147 } |
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148 |
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149 /* TODO abstract long getOffset() should be defined here. */ |
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150 |
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151 @Override |
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152 public void putObject(Node receiver, Object value) { |
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153 if (!type.isPrimitive() && value == null || type.isInstance(value)) { |
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154 unsafe.putObject(receiver, getOffset(), value); |
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155 } else { |
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156 throw new IllegalArgumentException(); |
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157 } |
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158 } |
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159 |
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160 @Override |
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161 public Object getObject(Node receiver) { |
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162 if (!type.isPrimitive()) { |
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163 return unsafe.getObject(receiver, getOffset()); |
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164 } else { |
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165 throw new IllegalArgumentException(); |
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166 } |
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167 } |
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168 |
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169 @Override |
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170 public Object loadValue(Node node) { |
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171 if (type == boolean.class) { |
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172 return unsafe.getBoolean(node, getOffset()); |
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173 } else if (type == byte.class) { |
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174 return unsafe.getByte(node, getOffset()); |
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175 } else if (type == short.class) { |
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176 return unsafe.getShort(node, getOffset()); |
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177 } else if (type == char.class) { |
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178 return unsafe.getChar(node, getOffset()); |
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179 } else if (type == int.class) { |
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180 return unsafe.getInt(node, getOffset()); |
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181 } else if (type == long.class) { |
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182 return unsafe.getLong(node, getOffset()); |
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183 } else if (type == float.class) { |
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184 return unsafe.getFloat(node, getOffset()); |
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185 } else if (type == double.class) { |
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186 return unsafe.getDouble(node, getOffset()); |
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187 } else { |
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188 return unsafe.getObject(node, getOffset()); |
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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 static final class UnsafeNodeField extends AbstractUnsafeNodeFieldAccessor { |
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194 /* TODO the offset field should be here, not in NodeFieldAccessor. */ |
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195 |
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196 protected UnsafeNodeField(NodeFieldKind kind, Field field) { |
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197 super(kind, field.getDeclaringClass(), field.getName(), field.getType(), unsafeFieldOffsetProvider.objectFieldOffset(field)); |
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198 } |
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199 } |
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200 |
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201 private static final class ReflectionNodeField extends NodeFieldAccessor { |
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202 private final Field field; |
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203 |
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204 protected ReflectionNodeField(NodeFieldKind kind, Field field) { |
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205 super(kind, field.getDeclaringClass(), field.getName(), field.getType(), unsafeFieldOffsetProvider.objectFieldOffset(field)); |
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206 this.field = field; |
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207 field.setAccessible(true); |
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208 } |
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209 |
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210 @Override |
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211 public void putObject(Node receiver, Object value) { |
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212 assert !type.isPrimitive() && value == null || type.isInstance(value); |
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213 try { |
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214 field.set(receiver, value); |
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215 } catch (IllegalAccessException e) { |
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216 throw new AssertionError(e); |
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217 } |
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218 } |
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219 |
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220 @Override |
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221 public Object getObject(Node receiver) { |
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222 assert !type.isPrimitive(); |
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223 try { |
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224 return field.get(receiver); |
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225 } catch (IllegalAccessException e) { |
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226 throw new AssertionError(e); |
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227 } |
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228 } |
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229 |
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230 @Override |
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231 public Object loadValue(Node node) { |
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232 try { |
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233 if (type == boolean.class) { |
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234 return field.getBoolean(node); |
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235 } else if (type == byte.class) { |
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236 return field.getByte(node); |
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237 } else if (type == short.class) { |
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238 return field.getShort(node); |
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239 } else if (type == char.class) { |
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240 return field.getChar(node); |
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241 } else if (type == int.class) { |
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242 return field.getInt(node); |
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243 } else if (type == long.class) { |
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244 return field.getLong(node); |
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245 } else if (type == float.class) { |
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246 return field.getFloat(node); |
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247 } else if (type == double.class) { |
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248 return field.getDouble(node); |
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249 } else { |
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250 return field.get(node); |
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251 } |
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252 } catch (IllegalAccessException e) { |
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253 throw new AssertionError(e); |
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254 } |
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255 } |
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256 } |
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257 |
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258 } |