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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/serial/PostOrderSerializer.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 9c8c0937da41
children dc83cc1f94f2
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1 /*
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2 * Copyright (c) 2012, 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.serial;
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26
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27 import static com.oracle.truffle.api.nodes.serial.PostOrderDeserializer.*;
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28
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29 import java.lang.reflect.*;
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30 import java.nio.*;
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31
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32 import sun.misc.*;
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33
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34 import com.oracle.truffle.api.nodes.*;
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35 import com.oracle.truffle.api.nodes.NodeFieldAccessor.NodeFieldKind;
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36 import com.oracle.truffle.api.source.*;
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37
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38 /**
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39 * Experimental API. May change without notice.
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40 */
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41 public final class PostOrderSerializer {
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42
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43 private static final Unsafe unsafe = loadUnsafe();
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44
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45 private final SerializerConstantPool cp;
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46
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47 /**
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48 * Constructs a new deserializer using a custom {@link SerializerConstantPool} implementation.
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49 * For the {@link SerializerConstantPool} implementation at least the following methods must be
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50 * implemented:
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51 * <ul>
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52 * <li>{@link SerializerConstantPool#putInt(int)}</li>
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53 * <li>{@link SerializerConstantPool#putClass(Class)}</li>
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54 * </ul>
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55 */
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56 public PostOrderSerializer(SerializerConstantPool cp) {
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57 this.cp = cp;
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58 }
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59
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60 /**
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61 * Serializes the node AST and returns the serialized data as byte array.
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62 *
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63 * @param node the root node that represents the Truffle AST that should be serialized.
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64 * @return a trimmed byte array that contains the serialized data.
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65 *
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66 * @throws UnsupportedConstantPoolTypeException thrown if a type is encountered that is not
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67 * supported by the constant pool implementation.
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68 */
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69 public byte[] serialize(Node node) throws UnsupportedConstantPoolTypeException {
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70 VariableLengthIntBuffer buffer = new VariableLengthIntBuffer(ByteBuffer.allocate(512));
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71 serialize(buffer, node);
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72 return buffer.getBytes();
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73 }
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74
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75 private void serialize(VariableLengthIntBuffer buffer, Node node) throws UnsupportedConstantPoolTypeException {
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76 if (node == null) {
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77 buffer.put(VariableLengthIntBuffer.NULL);
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78 return;
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79 }
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80 Class<? extends Node> nodeClass = node.getClass();
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81
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82 NodeFieldAccessor[] nodeFields = NodeClass.get(nodeClass).getFields();
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83 serializeChildFields(buffer, node, nodeFields);
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84 serializeChildrenFields(buffer, node, nodeFields);
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85 buffer.put(cp.putClass(node.getClass()));
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86 serializeDataFields(buffer, node, nodeFields);
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87 }
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88
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89 private void serializeDataFields(VariableLengthIntBuffer buffer, Node node, NodeFieldAccessor[] nodeFields) throws UnsupportedConstantPoolTypeException {
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90 for (int i = 0; i < nodeFields.length; i++) {
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91 NodeFieldAccessor field = nodeFields[i];
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92 if (field.getKind() == NodeFieldKind.DATA) {
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93 Class<?> fieldClass = field.getType();
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94 long offset = getFieldOffset(field);
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95 int cpi;
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96
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97 if (field.getType().isAssignableFrom(SourceSection.class)) {
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98 continue;
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99 }
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100
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101 if (fieldClass == int.class) {
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102 cpi = cp.putInt(unsafe.getInt(node, offset));
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103 } else if (fieldClass == long.class) {
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104 cpi = cp.putLong(unsafe.getLong(node, offset));
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105 } else if (fieldClass == float.class) {
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106 cpi = cp.putFloat(unsafe.getFloat(node, offset));
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107 } else if (fieldClass == double.class) {
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108 cpi = cp.putDouble(unsafe.getDouble(node, offset));
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109 } else if (fieldClass == byte.class) {
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110 cpi = cp.putInt(unsafe.getByte(node, offset));
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111 } else if (fieldClass == short.class) {
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112 cpi = cp.putInt(unsafe.getShort(node, offset));
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113 } else if (fieldClass == char.class) {
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114 cpi = cp.putInt(unsafe.getChar(node, offset));
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115 } else if (fieldClass == boolean.class) {
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116 cpi = cp.putInt(unsafe.getBoolean(node, offset) ? 1 : 0);
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117 } else {
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118 cpi = serializeDataFieldsObject(node, fieldClass, offset);
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119 }
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120
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121 buffer.put(cpi);
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122 }
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123 }
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124 }
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125
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126 private int serializeDataFieldsObject(Node node, Class<?> fieldClass, long offset) {
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127 Object value = unsafe.getObject(node, offset);
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128 if (value == null) {
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129 return VariableLengthIntBuffer.NULL;
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130 } else if (fieldClass == Integer.class) {
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131 return cp.putInt((Integer) value);
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132 } else if (fieldClass == Long.class) {
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133 return cp.putLong((Long) value);
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134 } else if (fieldClass == Float.class) {
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135 return cp.putFloat((Float) value);
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136 } else if (fieldClass == Double.class) {
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137 return cp.putDouble((Double) value);
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138 } else if (fieldClass == Byte.class) {
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139 return cp.putInt((Byte) value);
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140 } else if (fieldClass == Short.class) {
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141 return cp.putInt((Short) value);
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142 } else if (fieldClass == Character.class) {
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143 return cp.putInt((Character) value);
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144 } else if (fieldClass == Boolean.class) {
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145 return cp.putInt((Boolean) value ? 1 : 0);
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146 } else {
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147 return cp.putObject(fieldClass, value);
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148 }
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149 }
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150
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151 private void serializeChildrenFields(VariableLengthIntBuffer buffer, Node nodeInstance, NodeFieldAccessor[] nodeFields) throws UnsupportedConstantPoolTypeException {
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152 for (int i = 0; i < nodeFields.length; i++) {
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153 NodeFieldAccessor field = nodeFields[i];
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154 if (field.getKind() == NodeFieldKind.CHILDREN) {
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155 Object childArrayObject = unsafe.getObject(nodeInstance, getFieldOffset(field));
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156 if (childArrayObject != null && !(childArrayObject instanceof Node[])) {
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157 throw new AssertionError("Node children must be instanceof Node[]");
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158 }
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159
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160 buffer.put(cp.putClass(field.getType()));
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161
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162 Node[] childArray = (Node[]) childArrayObject;
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163 if (childArray == null) {
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164 buffer.put(VariableLengthIntBuffer.NULL);
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165 } else {
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166 buffer.put(cp.putInt(childArray.length));
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167
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168 for (int j = 0; j < childArray.length; j++) {
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169 serialize(buffer, childArray[j]);
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170 }
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171 }
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172 }
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173 }
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174 }
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175
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176 private void serializeChildFields(VariableLengthIntBuffer buffer, Node nodeInstance, NodeFieldAccessor[] nodeFields) throws UnsupportedConstantPoolTypeException {
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177 for (int i = 0; i < nodeFields.length; i++) {
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178 NodeFieldAccessor field = nodeFields[i];
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179 if (field.getKind() == NodeFieldKind.CHILD) {
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180 Object childObject = unsafe.getObject(nodeInstance, getFieldOffset(field));
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181 if (childObject != null && !(childObject instanceof Node)) {
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182 throw new AssertionError("Node children must be instanceof Node");
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183 }
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184 serialize(buffer, (Node) childObject);
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185 }
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186 }
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187 }
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188
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189 private static Unsafe loadUnsafe() {
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190 try {
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191 return Unsafe.getUnsafe();
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192 } catch (SecurityException e) {
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193 }
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194 try {
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195 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
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196 theUnsafeInstance.setAccessible(true);
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197 return (Unsafe) theUnsafeInstance.get(Unsafe.class);
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198 } catch (Exception e) {
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199 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e);
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200 }
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201 }
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202
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203 }