annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/NodeClass.java @ 20129:5b7db8941fd7

Truffle: make NodeClass and NodeField a top-level class.
author Christian Humer <christian.humer@gmail.com>
date Thu, 02 Apr 2015 01:22:41 +0200
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children 8dc73c226c63
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20129
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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 import java.security.*;
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29 import java.util.*;
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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.NodeFieldAccessor.NodeFieldKind;
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34
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35 /**
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36 * Information about a {@link Node} class. A single instance of this class is allocated for every
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37 * subclass of {@link Node} that is used.
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38 */
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39 public final class NodeClass {
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40 private static final ClassValue<NodeClass> nodeClasses = new ClassValue<NodeClass>() {
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41 @SuppressWarnings("unchecked")
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42 @Override
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43 protected NodeClass computeValue(final Class<?> clazz) {
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44 assert Node.class.isAssignableFrom(clazz);
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45 return AccessController.doPrivileged(new PrivilegedAction<NodeClass>() {
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46 public NodeClass run() {
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47 return new NodeClass((Class<? extends Node>) clazz);
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48 }
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49 });
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50 }
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51 };
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52
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53 // The comprehensive list of all fields.
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54 private final NodeFieldAccessor[] fields;
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55 // Separate arrays for the frequently accessed fields.
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56 private final NodeFieldAccessor parentField;
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57 private final NodeFieldAccessor[] childFields;
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58 private final NodeFieldAccessor[] childrenFields;
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59 private final NodeFieldAccessor[] cloneableFields;
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60
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61 private final Class<? extends Node> clazz;
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62
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63 public static NodeClass get(Class<? extends Node> clazz) {
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64 return nodeClasses.get(clazz);
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65 }
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66
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67 public NodeClass(Class<? extends Node> clazz) {
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68 List<NodeFieldAccessor> fieldsList = new ArrayList<>();
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69 NodeFieldAccessor parentFieldTmp = null;
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70 List<NodeFieldAccessor> childFieldList = new ArrayList<>();
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71 List<NodeFieldAccessor> childrenFieldList = new ArrayList<>();
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72 List<NodeFieldAccessor> cloneableFieldList = new ArrayList<>();
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73
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74 for (Field field : NodeUtil.getAllFields(clazz)) {
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75 if (Modifier.isStatic(field.getModifiers()) || field.isSynthetic()) {
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76 continue;
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77 }
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78
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79 NodeFieldAccessor nodeField;
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80 if (field.getDeclaringClass() == Node.class && field.getName().equals("parent")) {
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81 assert Node.class.isAssignableFrom(field.getType());
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82 nodeField = NodeFieldAccessor.create(NodeFieldKind.PARENT, field);
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83 parentFieldTmp = nodeField;
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84 } else if (field.getAnnotation(Child.class) != null) {
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85 checkChildField(field);
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86 nodeField = NodeFieldAccessor.create(NodeFieldKind.CHILD, field);
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87 childFieldList.add(nodeField);
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88 } else if (field.getAnnotation(Children.class) != null) {
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89 checkChildrenField(field);
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90 nodeField = NodeFieldAccessor.create(NodeFieldKind.CHILDREN, field);
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91 childrenFieldList.add(nodeField);
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92 } else {
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93 nodeField = NodeFieldAccessor.create(NodeFieldKind.DATA, field);
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94 if (NodeCloneable.class.isAssignableFrom(field.getType())) {
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95 cloneableFieldList.add(nodeField);
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96 }
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97 }
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98 fieldsList.add(nodeField);
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99 }
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100
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101 if (parentFieldTmp == null) {
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102 throw new AssertionError("parent field not found");
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103 }
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104
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105 this.fields = fieldsList.toArray(new NodeFieldAccessor[fieldsList.size()]);
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106 this.parentField = parentFieldTmp;
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107 this.childFields = childFieldList.toArray(new NodeFieldAccessor[childFieldList.size()]);
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108 this.childrenFields = childrenFieldList.toArray(new NodeFieldAccessor[childrenFieldList.size()]);
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109 this.cloneableFields = cloneableFieldList.toArray(new NodeFieldAccessor[cloneableFieldList.size()]);
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110 this.clazz = clazz;
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111 }
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112
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113 public NodeFieldAccessor[] getCloneableFields() {
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114 return cloneableFields;
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115 }
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116
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117 private static boolean isNodeType(Class<?> clazz) {
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118 return Node.class.isAssignableFrom(clazz) || (clazz.isInterface() && NodeInterface.class.isAssignableFrom(clazz));
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119 }
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120
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121 private static void checkChildField(Field field) {
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122 if (!isNodeType(field.getType())) {
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123 throw new AssertionError("@Child field type must be a subclass of Node or an interface extending NodeInterface (" + field + ")");
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124 }
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125 if (Modifier.isFinal(field.getModifiers())) {
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126 throw new AssertionError("@Child field must not be final (" + field + ")");
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127 }
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128 }
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129
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130 private static void checkChildrenField(Field field) {
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131 if (!(field.getType().isArray() && isNodeType(field.getType().getComponentType()))) {
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132 throw new AssertionError("@Children field type must be an array of a subclass of Node or an interface extending NodeInterface (" + field + ")");
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133 }
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134 if (!Modifier.isFinal(field.getModifiers())) {
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135 throw new AssertionError("@Children field must be final (" + field + ")");
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136 }
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137 }
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138
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139 public NodeFieldAccessor[] getFields() {
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140 return fields;
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141 }
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142
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143 public NodeFieldAccessor getParentField() {
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144 return parentField;
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145 }
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146
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147 public NodeFieldAccessor[] getChildFields() {
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148 return childFields;
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149 }
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150
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151 public NodeFieldAccessor[] getChildrenFields() {
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152 return childrenFields;
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153 }
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154
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155 @Override
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156 public int hashCode() {
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157 return clazz.hashCode();
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158 }
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159
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160 @Override
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161 public boolean equals(Object obj) {
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162 if (obj instanceof NodeClass) {
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163 NodeClass other = (NodeClass) obj;
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164 return clazz.equals(other.clazz);
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165 }
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166 return false;
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167 }
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168
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169 public Iterator<Node> makeIterator(Node node) {
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170 assert clazz.isInstance(node);
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171 return new NodeIterator(this, node);
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172 }
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173
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174 private static final class NodeIterator implements Iterator<Node> {
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175 private final NodeFieldAccessor[] childFields;
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176 private final NodeFieldAccessor[] childrenFields;
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177 private final Node node;
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178 private final int childrenCount;
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179 private int index;
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180
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181 protected NodeIterator(NodeClass nodeClass, Node node) {
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182 this.childFields = nodeClass.getChildFields();
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183 this.childrenFields = nodeClass.getChildrenFields();
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184 this.node = node;
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185 this.childrenCount = childrenCount();
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186 this.index = 0;
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187 }
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188
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189 private int childrenCount() {
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190 int nodeCount = childFields.length;
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191 for (NodeFieldAccessor childrenField : childrenFields) {
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192 Object[] children = ((Object[]) childrenField.getObject(node));
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193 if (children != null) {
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194 nodeCount += children.length;
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195 }
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196 }
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197 return nodeCount;
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198 }
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199
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200 private Node nodeAt(int idx) {
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201 int nodeCount = childFields.length;
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202 if (idx < nodeCount) {
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203 return (Node) childFields[idx].getObject(node);
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204 } else {
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205 for (NodeFieldAccessor childrenField : childrenFields) {
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206 Object[] nodeArray = (Object[]) childrenField.getObject(node);
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207 if (idx < nodeCount + nodeArray.length) {
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208 return (Node) nodeArray[idx - nodeCount];
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209 }
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210 nodeCount += nodeArray.length;
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211 }
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212 }
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213 return null;
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214 }
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215
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216 private void forward() {
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217 if (index < childrenCount) {
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218 index++;
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219 }
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220 }
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221
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222 public boolean hasNext() {
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223 return index < childrenCount;
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224 }
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225
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226 public Node next() {
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227 try {
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228 return nodeAt(index);
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229 } finally {
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230 forward();
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231 }
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232 }
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233
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Christian Humer <christian.humer@gmail.com>
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234 public void remove() {
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235 throw new UnsupportedOperationException();
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236 }
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237 }
5b7db8941fd7 Truffle: make NodeClass and NodeField a top-level class.
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238 }