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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeFieldAccessor.java @ 22176:cd7ee4a382e4

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Remove obsolete unsafeFieldOffsetProvider from NodeFieldAccessor
author Andreas Woess <andreas.woess@oracle.com>
date Fri, 18 Sep 2015 17:07:55 +0200
parents dc83cc1f94f2
children 0d4b0e4263ee
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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.Field;
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28
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29 import sun.misc.Unsafe;
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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
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34 /**
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35 * Information about a field in a {@link Node} class.
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36 */
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37 public abstract class NodeFieldAccessor {
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38
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39 public static enum NodeFieldKind {
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40 /** The reference to the {@link NodeClass}. */
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41 NODE_CLASS,
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42 /** The single {@link Node#getParent() parent} field. */
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43 PARENT,
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44 /** A field annotated with {@link Child}. */
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45 CHILD,
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46 /** A field annotated with {@link Children}. */
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47 CHILDREN,
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48 /** A normal non-child data field of the node. */
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49 DATA
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50 }
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51
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52 private static final boolean USE_UNSAFE = Boolean.getBoolean("truffle.unsafe");
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53
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54 private final NodeFieldKind kind;
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55 private final Class<?> declaringClass;
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56 private final String name;
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57 protected final Class<?> type;
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58
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59 protected NodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClass, String name, Class<?> type) {
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60 this.kind = kind;
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61 this.declaringClass = declaringClass;
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62 this.name = name;
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63 this.type = type;
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64 }
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65
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66 protected static NodeFieldAccessor create(NodeFieldKind kind, Field field) {
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67 if (USE_UNSAFE) {
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68 return new UnsafeNodeField(kind, field);
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69 } else {
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70 return new ReflectionNodeField(kind, field);
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71 }
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72 }
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73
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74 public NodeFieldKind getKind() {
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75 return kind;
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76 }
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77
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78 public Class<?> getType() {
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79 return type;
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80 }
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81
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82 public Class<?> getDeclaringClass() {
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83 return declaringClass;
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84 }
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85
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86 public String getName() {
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87 return name;
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88 }
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89
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90 public abstract void putObject(Node receiver, Object value);
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91
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92 public abstract Object getObject(Node receiver);
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93
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94 public abstract Object loadValue(Node node);
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95
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96 public abstract static class AbstractUnsafeNodeFieldAccessor extends NodeFieldAccessor {
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97
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98 protected AbstractUnsafeNodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClass, String name, Class<?> type) {
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99 super(kind, declaringClass, name, type);
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100 }
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101
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102 public abstract long getOffset();
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103
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104 @Override
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105 public void putObject(Node receiver, Object value) {
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106 if (!type.isPrimitive() && value == null || type.isInstance(value)) {
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107 unsafe.putObject(receiver, getOffset(), value);
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108 } else {
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109 throw new IllegalArgumentException();
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110 }
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111 }
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112
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113 @Override
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114 public Object getObject(Node receiver) {
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115 if (!type.isPrimitive()) {
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116 return unsafe.getObject(receiver, getOffset());
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117 } else {
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118 throw new IllegalArgumentException();
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119 }
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120 }
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121
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122 @Override
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123 public Object loadValue(Node node) {
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124 if (type == boolean.class) {
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125 return unsafe.getBoolean(node, getOffset());
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126 } else if (type == byte.class) {
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127 return unsafe.getByte(node, getOffset());
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128 } else if (type == short.class) {
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129 return unsafe.getShort(node, getOffset());
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130 } else if (type == char.class) {
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131 return unsafe.getChar(node, getOffset());
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132 } else if (type == int.class) {
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133 return unsafe.getInt(node, getOffset());
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134 } else if (type == long.class) {
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135 return unsafe.getLong(node, getOffset());
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136 } else if (type == float.class) {
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137 return unsafe.getFloat(node, getOffset());
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138 } else if (type == double.class) {
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139 return unsafe.getDouble(node, getOffset());
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140 } else {
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141 return unsafe.getObject(node, getOffset());
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142 }
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143 }
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144
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145 private static final Unsafe unsafe = getUnsafe();
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146
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147 private static Unsafe getUnsafe() {
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148 try {
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149 return Unsafe.getUnsafe();
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150 } catch (SecurityException e) {
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151 }
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152 try {
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153 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
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154 theUnsafeInstance.setAccessible(true);
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155 return (Unsafe) theUnsafeInstance.get(Unsafe.class);
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156 } catch (Exception e) {
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157 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
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158 }
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159 }
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160 }
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161
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162 private static final class UnsafeNodeField extends AbstractUnsafeNodeFieldAccessor {
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163 private final long offset;
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164
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165 protected UnsafeNodeField(NodeFieldKind kind, Field field) {
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166 super(kind, field.getDeclaringClass(), field.getName(), field.getType());
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167 this.offset = AbstractUnsafeNodeFieldAccessor.unsafe.objectFieldOffset(field);
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168 }
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169
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170 @Override
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171 public long getOffset() {
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172 return offset;
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173 }
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174 }
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175
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176 private static final class ReflectionNodeField extends NodeFieldAccessor {
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177 private final Field field;
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178
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179 protected ReflectionNodeField(NodeFieldKind kind, Field field) {
21985
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180 super(kind, field.getDeclaringClass(), field.getName(), field.getType());
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181 this.field = field;
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182 field.setAccessible(true);
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183 }
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184
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185 @Override
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186 public void putObject(Node receiver, Object value) {
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187 assert !type.isPrimitive() && value == null || type.isInstance(value);
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188 try {
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189 field.set(receiver, value);
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190 } catch (IllegalAccessException e) {
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191 throw new AssertionError(e);
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192 }
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193 }
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194
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195 @Override
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196 public Object getObject(Node receiver) {
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197 assert !type.isPrimitive();
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198 try {
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199 return field.get(receiver);
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200 } catch (IllegalAccessException e) {
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201 throw new AssertionError(e);
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202 }
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203 }
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204
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205 @Override
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206 public Object loadValue(Node node) {
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207 try {
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208 if (type == boolean.class) {
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209 return field.getBoolean(node);
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210 } else if (type == byte.class) {
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211 return field.getByte(node);
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212 } else if (type == short.class) {
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213 return field.getShort(node);
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214 } else if (type == char.class) {
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215 return field.getChar(node);
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216 } else if (type == int.class) {
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217 return field.getInt(node);
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parents:
diff changeset
218 } else if (type == long.class) {
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diff changeset
219 return field.getLong(node);
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parents:
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220 } else if (type == float.class) {
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parents:
diff changeset
221 return field.getFloat(node);
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parents:
diff changeset
222 } else if (type == double.class) {
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parents:
diff changeset
223 return field.getDouble(node);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
224 } else {
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parents:
diff changeset
225 return field.get(node);
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parents:
diff changeset
226 }
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
227 } catch (IllegalAccessException e) {
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
228 throw new AssertionError(e);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
229 }
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parents:
diff changeset
230 }
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
231 }
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parents:
diff changeset
232
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
233 }