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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeFieldAccessor.java @ 21965:0103d237f6c3

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Make NodeFieldAccessor more flexible
author Christian Wimmer <christian.wimmer@oracle.com>
date Mon, 22 Jun 2015 10:15:05 -0700
parents 9c8c0937da41
children 08db96a633b9
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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 /* TODO: This method should be removed from here. It should be an abstract method in AbstractUnsafeNodeFieldAccessor, and implemented in UnsafeNodeField. */
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95 public long getOffset() {
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96 return offset;
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97 }
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98
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99 public abstract void putObject(Node receiver, Object value);
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100
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101 public abstract Object getObject(Node receiver);
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102
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103 public abstract Object loadValue(Node node);
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104
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105 private static final Unsafe unsafe = getUnsafe();
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106
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107 private static Unsafe getUnsafe() {
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108 try {
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109 return Unsafe.getUnsafe();
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110 } catch (SecurityException e) {
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111 }
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112 try {
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113 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
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114 theUnsafeInstance.setAccessible(true);
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115 return (Unsafe) theUnsafeInstance.get(Unsafe.class);
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116 } catch (Exception e) {
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117 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
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118 }
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119 }
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120
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121 private static final FieldOffsetProvider unsafeFieldOffsetProvider = new FieldOffsetProvider() {
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122
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123 @Override
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124 public long objectFieldOffset(Field field) {
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125 return unsafe.objectFieldOffset(field);
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126 }
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127
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128 @Override
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129 public int getTypeSize(Class<?> clazz) {
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130 if (!clazz.isPrimitive()) {
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131 return Unsafe.ARRAY_OBJECT_INDEX_SCALE;
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132 } else if (clazz == int.class) {
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133 return Unsafe.ARRAY_INT_INDEX_SCALE;
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134 } else {
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135 throw new UnsupportedOperationException("unsupported field type: " + clazz);
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136 }
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137 }
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138 };
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139
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140 public abstract static class AbstractUnsafeNodeFieldAccessor extends NodeFieldAccessor {
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141
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142 protected AbstractUnsafeNodeFieldAccessor(NodeFieldKind kind, Class<?> declaringClas, String name, Class<?> type, long offset) {
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143 super(kind, declaringClas, name, type, offset);
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144 }
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145
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146 /* TODO abstract long getOffset() should be defined here. */
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147
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148 @Override
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149 public void putObject(Node receiver, Object value) {
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150 if (!type.isPrimitive() && value == null || type.isInstance(value)) {
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151 unsafe.putObject(receiver, getOffset(), value);
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152 } else {
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153 throw new IllegalArgumentException();
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154 }
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155 }
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156
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157 @Override
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158 public Object getObject(Node receiver) {
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159 if (!type.isPrimitive()) {
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160 return unsafe.getObject(receiver, getOffset());
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161 } else {
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162 throw new IllegalArgumentException();
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163 }
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164 }
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165
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166 @Override
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167 public Object loadValue(Node node) {
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168 if (type == boolean.class) {
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169 return unsafe.getBoolean(node, getOffset());
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170 } else if (type == byte.class) {
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171 return unsafe.getByte(node, getOffset());
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172 } else if (type == short.class) {
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173 return unsafe.getShort(node, getOffset());
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174 } else if (type == char.class) {
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175 return unsafe.getChar(node, getOffset());
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176 } else if (type == int.class) {
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177 return unsafe.getInt(node, getOffset());
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178 } else if (type == long.class) {
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179 return unsafe.getLong(node, getOffset());
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180 } else if (type == float.class) {
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181 return unsafe.getFloat(node, getOffset());
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182 } else if (type == double.class) {
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183 return unsafe.getDouble(node, getOffset());
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184 } else {
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185 return unsafe.getObject(node, getOffset());
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186 }
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187 }
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188 }
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189
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190 private static final class UnsafeNodeField extends AbstractUnsafeNodeFieldAccessor {
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191 /* TODO the offset field should be here, not in NodeFieldAccessor. */
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192
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193 protected UnsafeNodeField(NodeFieldKind kind, Field field) {
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194 super(kind, field.getDeclaringClass(), field.getName(), field.getType(), unsafeFieldOffsetProvider.objectFieldOffset(field));
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195 }
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196 }
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197
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198 private static final class ReflectionNodeField extends NodeFieldAccessor {
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199 private final Field field;
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200
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201 protected ReflectionNodeField(NodeFieldKind kind, Field field) {
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202 super(kind, field.getDeclaringClass(), field.getName(), field.getType(), unsafeFieldOffsetProvider.objectFieldOffset(field));
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203 this.field = field;
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204 field.setAccessible(true);
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205 }
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206
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207 @Override
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208 public void putObject(Node receiver, Object value) {
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209 assert !type.isPrimitive() && value == null || type.isInstance(value);
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210 try {
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211 field.set(receiver, value);
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diff changeset
212 } catch (IllegalAccessException e) {
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diff changeset
213 throw new AssertionError(e);
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214 }
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parents:
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215 }
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parents:
diff changeset
216
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diff changeset
217 @Override
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218 public Object getObject(Node receiver) {
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diff changeset
219 assert !type.isPrimitive();
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parents:
diff changeset
220 try {
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221 return field.get(receiver);
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parents:
diff changeset
222 } catch (IllegalAccessException e) {
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parents:
diff changeset
223 throw new AssertionError(e);
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Christian Humer <christian.humer@gmail.com>
parents:
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224 }
5b7db8941fd7 Truffle: make NodeClass and NodeField a top-level class.
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225 }
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226
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227 @Override
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228 public Object loadValue(Node node) {
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229 try {
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230 if (type == boolean.class) {
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diff changeset
231 return field.getBoolean(node);
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diff changeset
232 } else if (type == byte.class) {
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233 return field.getByte(node);
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Christian Humer <christian.humer@gmail.com>
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diff changeset
234 } else if (type == short.class) {
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235 return field.getShort(node);
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parents:
diff changeset
236 } else if (type == char.class) {
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diff changeset
237 return field.getChar(node);
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parents:
diff changeset
238 } else if (type == int.class) {
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239 return field.getInt(node);
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diff changeset
240 } else if (type == long.class) {
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241 return field.getLong(node);
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242 } else if (type == float.class) {
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243 return field.getFloat(node);
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244 } else if (type == double.class) {
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245 return field.getDouble(node);
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diff changeset
246 } else {
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247 return field.get(node);
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248 }
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249 } catch (IllegalAccessException e) {
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diff changeset
250 throw new AssertionError(e);
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parents:
diff changeset
251 }
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252 }
5b7db8941fd7 Truffle: make NodeClass and NodeField a top-level class.
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253 }
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parents:
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254
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diff changeset
255 }