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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeFieldAccessor.java @ 21985:4858c5e074e9

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clean up NodeFieldAccessor (remove #getOffset())
author Andreas Woess <andreas.woess@oracle.com>
date Fri, 26 Jun 2015 16:25:41 +0200
parents 08db96a633b9
children dc83cc1f94f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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60 protected NodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClass, String name, Class<?> type) {
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61 this.kind = kind;
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62 this.declaringClass = declaringClass;
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63 this.name = name;
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64 this.type = type;
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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 Class<?> getDeclaringClass() {
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84 return declaringClass;
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85 }
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86
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87 public String getName() {
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88 return name;
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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 private static final Unsafe unsafe = getUnsafe();
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98
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99 private static Unsafe getUnsafe() {
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100 try {
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101 return Unsafe.getUnsafe();
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102 } catch (SecurityException e) {
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103 }
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104 try {
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105 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
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106 theUnsafeInstance.setAccessible(true);
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107 return (Unsafe) theUnsafeInstance.get(Unsafe.class);
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108 } catch (Exception e) {
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109 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
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110 }
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111 }
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112
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113 private static final FieldOffsetProvider unsafeFieldOffsetProvider = new FieldOffsetProvider() {
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114
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115 @Override
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116 public long objectFieldOffset(Field field) {
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117 return unsafe.objectFieldOffset(field);
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118 }
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119
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120 @Override
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121 public int getTypeSize(Class<?> clazz) {
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122 if (!clazz.isPrimitive()) {
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123 return Unsafe.ARRAY_OBJECT_INDEX_SCALE;
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124 } else if (clazz == int.class) {
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125 return Unsafe.ARRAY_INT_INDEX_SCALE;
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126 } else {
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127 throw new UnsupportedOperationException("unsupported field type: " + clazz);
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128 }
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129 }
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130 };
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131
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132 public abstract static class AbstractUnsafeNodeFieldAccessor extends NodeFieldAccessor {
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133
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134 protected AbstractUnsafeNodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClass, String name, Class<?> type) {
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135 super(kind, declaringClass, name, type);
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136 }
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137
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138 public abstract long getOffset();
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139
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140 @Override
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141 public void putObject(Node receiver, Object value) {
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142 if (!type.isPrimitive() && value == null || type.isInstance(value)) {
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143 unsafe.putObject(receiver, getOffset(), value);
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144 } else {
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145 throw new IllegalArgumentException();
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146 }
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147 }
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148
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149 @Override
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150 public Object getObject(Node receiver) {
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151 if (!type.isPrimitive()) {
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152 return unsafe.getObject(receiver, getOffset());
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153 } else {
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154 throw new IllegalArgumentException();
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155 }
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156 }
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157
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158 @Override
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159 public Object loadValue(Node node) {
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160 if (type == boolean.class) {
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161 return unsafe.getBoolean(node, getOffset());
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162 } else if (type == byte.class) {
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163 return unsafe.getByte(node, getOffset());
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164 } else if (type == short.class) {
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165 return unsafe.getShort(node, getOffset());
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166 } else if (type == char.class) {
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167 return unsafe.getChar(node, getOffset());
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168 } else if (type == int.class) {
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169 return unsafe.getInt(node, getOffset());
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170 } else if (type == long.class) {
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171 return unsafe.getLong(node, getOffset());
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172 } else if (type == float.class) {
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173 return unsafe.getFloat(node, getOffset());
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174 } else if (type == double.class) {
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175 return unsafe.getDouble(node, getOffset());
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176 } else {
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177 return unsafe.getObject(node, getOffset());
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178 }
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179 }
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180 }
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181
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182 private static final class UnsafeNodeField extends AbstractUnsafeNodeFieldAccessor {
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183 private final long offset;
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184
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185 protected UnsafeNodeField(NodeFieldKind kind, Field field) {
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186 super(kind, field.getDeclaringClass(), field.getName(), field.getType());
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187 this.offset = unsafeFieldOffsetProvider.objectFieldOffset(field);
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188 }
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189
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190 @Override
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191 public long getOffset() {
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192 return offset;
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193 }
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194 }
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195
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196 private static final class ReflectionNodeField extends NodeFieldAccessor {
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197 private final Field field;
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198
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199 protected ReflectionNodeField(NodeFieldKind kind, Field field) {
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200 super(kind, field.getDeclaringClass(), field.getName(), field.getType());
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201 this.field = field;
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202 field.setAccessible(true);
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203 }
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204
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205 @Override
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206 public void putObject(Node receiver, Object value) {
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207 assert !type.isPrimitive() && value == null || type.isInstance(value);
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208 try {
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209 field.set(receiver, value);
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210 } catch (IllegalAccessException e) {
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211 throw new AssertionError(e);
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212 }
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213 }
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214
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215 @Override
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216 public Object getObject(Node receiver) {
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217 assert !type.isPrimitive();
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218 try {
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219 return field.get(receiver);
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220 } catch (IllegalAccessException e) {
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221 throw new AssertionError(e);
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222 }
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223 }
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224
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225 @Override
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226 public Object loadValue(Node node) {
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227 try {
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228 if (type == boolean.class) {
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229 return field.getBoolean(node);
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diff changeset
230 } else if (type == byte.class) {
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diff changeset
231 return field.getByte(node);
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diff changeset
232 } else if (type == short.class) {
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233 return field.getShort(node);
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diff changeset
234 } else if (type == char.class) {
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235 return field.getChar(node);
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parents:
diff changeset
236 } else if (type == int.class) {
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237 return field.getInt(node);
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parents:
diff changeset
238 } else if (type == long.class) {
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diff changeset
239 return field.getLong(node);
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parents:
diff changeset
240 } else if (type == float.class) {
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diff changeset
241 return field.getFloat(node);
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parents:
diff changeset
242 } else if (type == double.class) {
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diff changeset
243 return field.getDouble(node);
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
244 } else {
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245 return field.get(node);
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246 }
5b7db8941fd7 Truffle: make NodeClass and NodeField a top-level class.
Christian Humer <christian.humer@gmail.com>
parents:
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247 } catch (IllegalAccessException e) {
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Christian Humer <christian.humer@gmail.com>
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diff changeset
248 throw new AssertionError(e);
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parents:
diff changeset
249 }
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parents:
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250 }
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
251 }
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parents:
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252
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Christian Humer <christian.humer@gmail.com>
parents:
diff changeset
253 }