Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/serial/PostOrderDeserializer.java @ 12388:96c1d057a5ed
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author | Christian Humer <christian.humer@gmail.com> |
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date | Wed, 02 Oct 2013 15:33:08 +0200 |
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children | 64dcb92ee75a |
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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 java.lang.reflect.*; |
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28 import java.util.*; |
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29 |
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30 import sun.misc.*; |
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31 |
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32 import com.oracle.truffle.api.*; |
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33 import com.oracle.truffle.api.nodes.*; |
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34 import com.oracle.truffle.api.nodes.NodeUtil.*; |
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35 |
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36 /** |
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37 * Experimental API. May change without notice. |
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38 */ |
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39 public final class PostOrderDeserializer { |
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40 |
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41 private static final Unsafe unsafe = loadUnsafe(); |
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42 |
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43 private final SerializerConstantPool cp; |
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44 |
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45 private final HierarchicalStack stack = new HierarchicalStack(); |
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46 |
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47 /** |
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48 * Constructs a new serializer using a custom {@link SerializerConstantPool} implementation. For |
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49 * 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#getInt(int)}</li> |
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53 * <li>{@link SerializerConstantPool#getClass(int)}</li> |
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54 * </ul> |
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55 */ |
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56 public PostOrderDeserializer(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 * Deserializes the byte stream and returns the deserialized Truffle AST node. |
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62 * |
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63 * @param bytes the trimmed byte array containing the serialized data |
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64 * @param expectedType the expected root node type. Throws an exception if the root node is not |
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65 * assignable from this type. |
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66 * @return the deserialized Truffle AST represented by the root Node. |
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67 * |
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68 * @throws UnsupportedConstantPoolTypeException thrown if a type is encountered that is not |
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69 * supported by the constant pool implementation. |
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70 */ |
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71 @SuppressWarnings("unchecked") |
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72 public <T extends Node> T deserialize(byte[] bytes, Class<T> expectedType) throws UnsupportedConstantPoolTypeException { |
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73 VariableLengthIntBuffer buffer = new VariableLengthIntBuffer(bytes); |
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74 |
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75 while (buffer.hasRemaining()) { |
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76 int classCPI = buffer.get(); |
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77 if (classCPI == VariableLengthIntBuffer.NULL) { |
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78 pushNode(null); |
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79 } else { |
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80 Class<?> clazz = cp.getClass(classCPI); |
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81 if (clazz.isArray()) { |
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82 int lengthCPI = buffer.get(); |
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83 if (lengthCPI == VariableLengthIntBuffer.NULL) { |
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84 pushArray(null); |
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85 } else { |
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86 pushArray((Node[]) Array.newInstance(clazz.getComponentType(), cp.getInt(lengthCPI))); |
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87 } |
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88 } else { |
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89 pushNode(invokeDeserialize(buffer, clazz.asSubclass(Node.class))); |
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90 } |
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91 } |
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92 } |
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93 T returnNode = (T) popNode(null, expectedType); |
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94 |
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95 assert stack.dynamicStack.isEmpty(); |
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96 |
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97 return returnNode; |
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98 } |
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99 |
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100 private void pushNode(Node node) { |
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101 stack.push(node); |
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102 } |
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103 |
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104 private void pushArray(Node[] array) { |
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105 stack.pushStack(array); |
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106 } |
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107 |
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108 private Node[] popArray(Node parent, Class<?> expectedType) { |
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109 Node[] array = (Node[]) stack.popStack(); |
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110 if (array != null) { |
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111 assertType(array, expectedType); |
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112 for (int i = 0; i < array.length; i++) { |
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113 updateParent(parent, array[i]); |
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114 } |
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115 } |
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116 return array; |
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117 } |
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118 |
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119 private Node popNode(Node parent, Class<?> expectedType) { |
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120 Object o = stack.pop(); |
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121 assertType(o, expectedType); |
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122 updateParent(parent, (Node) o); |
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123 return (Node) o; |
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124 } |
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125 |
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126 private static void assertType(Object o, Class<?> expectedType) { |
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127 if (o != null && !expectedType.isAssignableFrom(o.getClass())) { |
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128 throw new AssertionError("Expected element type '" + expectedType.getName() + "' but was '" + o.getClass().getName() + "'."); |
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129 } |
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130 } |
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131 |
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132 private Node invokeDeserialize(VariableLengthIntBuffer buffer, Class<? extends Node> nodeClass) throws UnsupportedConstantPoolTypeException { |
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133 if (nodeClass == null) { |
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134 return null; |
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135 } |
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136 |
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137 Object object; |
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138 try { |
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139 object = unsafe.allocateInstance(nodeClass); |
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140 } catch (InstantiationException e) { |
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141 throw new RuntimeException("Unable to allocate truffle node " + nodeClass, e); |
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142 } |
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143 if (!(object instanceof Node)) { |
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144 throw new RuntimeException("Class is not a truffle node " + nodeClass); |
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145 } |
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146 |
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147 Node node = (Node) object; |
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148 |
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149 NodeField[] nodeFields = NodeClass.get(nodeClass).getFields(); |
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150 deserializeChildrenFields(node, nodeFields); |
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151 deserializeChildFields(node, nodeFields); |
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152 deserializeDataFields(buffer, node, nodeFields); |
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153 |
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154 return node; |
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155 } |
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156 |
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157 private void deserializeDataFields(VariableLengthIntBuffer buffer, Node nodeInstance, NodeField[] nodeFields) throws UnsupportedConstantPoolTypeException { |
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158 for (int i = 0; i < nodeFields.length; i++) { |
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159 NodeField field = nodeFields[i]; |
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160 if (field.getKind() == NodeFieldKind.DATA) { |
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161 Class<?> fieldClass = field.getType(); |
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162 long offset = field.getOffset(); |
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163 |
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164 // source sections are not serialized |
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165 // TODO add support for source sections |
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166 if (field.getType().isAssignableFrom(SourceSection.class)) { |
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167 continue; |
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168 } |
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169 |
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170 int cpi = buffer.get(); |
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171 if (cpi == VariableLengthIntBuffer.NULL) { |
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172 if (fieldClass == int.class) { |
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173 unsafe.putInt(nodeInstance, offset, 0); |
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174 } else if (fieldClass == long.class) { |
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175 unsafe.putLong(nodeInstance, offset, 0L); |
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176 } else if (fieldClass == float.class) { |
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177 unsafe.putFloat(nodeInstance, offset, 0.0F); |
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178 } else if (fieldClass == double.class) { |
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179 unsafe.putDouble(nodeInstance, offset, 0.0D); |
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180 } else if (fieldClass == byte.class) { |
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181 unsafe.putByte(nodeInstance, offset, (byte) 0); |
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182 } else if (fieldClass == short.class) { |
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183 unsafe.putShort(nodeInstance, offset, (short) 0); |
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184 } else if (fieldClass == char.class) { |
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185 unsafe.putChar(nodeInstance, offset, (char) 0); |
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186 } else if (fieldClass == boolean.class) { |
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187 unsafe.putBoolean(nodeInstance, offset, false); |
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188 } else { |
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189 unsafe.putObject(nodeInstance, offset, null); |
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190 } |
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191 } else { |
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192 if (fieldClass == int.class) { |
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193 unsafe.putInt(nodeInstance, offset, cp.getInt(cpi)); |
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194 } else if (fieldClass == long.class) { |
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195 unsafe.putLong(nodeInstance, offset, cp.getLong(cpi)); |
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196 } else if (fieldClass == float.class) { |
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197 unsafe.putFloat(nodeInstance, offset, cp.getFloat(cpi)); |
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198 } else if (fieldClass == double.class) { |
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199 unsafe.putDouble(nodeInstance, offset, cp.getDouble(cpi)); |
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200 } else if (fieldClass == byte.class) { |
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201 unsafe.putByte(nodeInstance, offset, (byte) cp.getInt(cpi)); |
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202 } else if (fieldClass == short.class) { |
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203 unsafe.putShort(nodeInstance, offset, (short) cp.getInt(cpi)); |
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204 } else if (fieldClass == char.class) { |
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205 unsafe.putChar(nodeInstance, offset, (char) cp.getInt(cpi)); |
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206 } else if (fieldClass == boolean.class) { |
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207 unsafe.putBoolean(nodeInstance, offset, cp.getInt(cpi) == 1 ? true : false); |
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208 } else if (fieldClass == Integer.class) { |
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209 unsafe.putObject(nodeInstance, offset, cp.getInt(cpi)); |
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210 } else if (fieldClass == Long.class) { |
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211 unsafe.putObject(nodeInstance, offset, cp.getLong(cpi)); |
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212 } else if (fieldClass == Float.class) { |
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213 unsafe.putObject(nodeInstance, offset, cp.getFloat(cpi)); |
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214 } else if (fieldClass == Double.class) { |
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215 unsafe.putObject(nodeInstance, offset, cp.getDouble(cpi)); |
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216 } else if (fieldClass == Byte.class) { |
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217 unsafe.putObject(nodeInstance, offset, (byte) cp.getInt(cpi)); |
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218 } else if (fieldClass == Short.class) { |
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219 unsafe.putObject(nodeInstance, offset, (short) cp.getInt(cpi)); |
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220 } else if (fieldClass == Character.class) { |
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221 unsafe.putObject(nodeInstance, offset, (char) cp.getInt(cpi)); |
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222 } else if (fieldClass == Boolean.class) { |
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223 unsafe.putObject(nodeInstance, offset, cp.getInt(cpi) == 1 ? Boolean.TRUE : Boolean.FALSE); |
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224 } else { |
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225 unsafe.putObject(nodeInstance, offset, cp.getObject(fieldClass, cpi)); |
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226 } |
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227 } |
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228 } |
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229 } |
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230 } |
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231 |
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232 private void deserializeChildFields(Node parent, NodeField[] nodeFields) { |
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233 for (int i = nodeFields.length - 1; i >= 0; i--) { |
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234 NodeField field = nodeFields[i]; |
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235 if (field.getKind() == NodeFieldKind.CHILD) { |
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236 unsafe.putObject(parent, field.getOffset(), popNode(parent, field.getType())); |
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237 } |
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238 } |
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239 } |
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240 |
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241 private void deserializeChildrenFields(Node parent, NodeField[] nodeFields) { |
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242 for (int i = nodeFields.length - 1; i >= 0; i--) { |
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243 NodeField field = nodeFields[i]; |
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244 if (field.getKind() == NodeFieldKind.CHILDREN) { |
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245 unsafe.putObject(parent, field.getOffset(), popArray(parent, field.getType())); |
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246 } |
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247 } |
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248 } |
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249 |
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250 private static Node updateParent(Node parent, Node child) { |
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251 if (child != null) { |
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252 long parentOffset = NodeClass.get(child.getClass()).getParentOffset(); |
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253 unsafe.putObject(child, parentOffset, parent); |
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254 } |
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255 return child; |
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256 } |
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257 |
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258 private static Unsafe loadUnsafe() { |
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259 try { |
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260 return Unsafe.getUnsafe(); |
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261 } catch (SecurityException e) { |
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262 } |
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263 try { |
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264 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe"); |
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265 theUnsafeInstance.setAccessible(true); |
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266 return (Unsafe) theUnsafeInstance.get(Unsafe.class); |
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267 } catch (Exception e) { |
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268 throw new RuntimeException("exception while trying to get Unsafe.theUnsafe via reflection:", e); |
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269 } |
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270 } |
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271 |
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272 private static class HierarchicalStack { |
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273 |
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274 private static final Object NULL_STACK = new Object(); |
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275 |
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276 private final List<Object> dynamicStack = new ArrayList<>(); |
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277 |
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278 void pushStack(Object[] array) { |
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279 if (array == null) { |
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280 dynamicStack.add(NULL_STACK); |
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281 } else { |
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282 dynamicStack.add(new FixedSizeNodeStack(array)); |
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283 } |
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284 } |
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285 |
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286 private FixedSizeNodeStack getTosStack() { |
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287 if (dynamicStack.isEmpty()) { |
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288 return null; |
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289 } |
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290 Object peekTos = dynamicStack.get(dynamicStack.size() - 1); |
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291 if (peekTos != null && peekTos.getClass() == FixedSizeNodeStack.class) { |
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292 return (FixedSizeNodeStack) peekTos; |
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293 } |
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294 return null; |
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295 } |
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296 |
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297 Object[] popStack() { |
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298 Object tos = dynamicStack.remove(dynamicStack.size() - 1); |
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299 if (tos == NULL_STACK) { |
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300 return null; |
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301 } |
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302 return ((FixedSizeNodeStack) tos).getArray(); |
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303 } |
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304 |
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305 void push(Object o) { |
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306 FixedSizeNodeStack tosStack = getTosStack(); |
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307 if (tosStack != null && !tosStack.isFull()) { |
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308 tosStack.push(o); |
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309 } else { |
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310 dynamicStack.add(o); |
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311 } |
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312 } |
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313 |
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314 Object pop() { |
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315 FixedSizeNodeStack tosStack = getTosStack(); |
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316 Object value; |
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317 if (tosStack != null) { |
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318 assert !tosStack.isEmpty(); |
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319 value = tosStack.pop(); |
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320 } else { |
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321 value = dynamicStack.remove(dynamicStack.size() - 1); |
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322 } |
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323 assert value != NULL_STACK; |
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324 return value; |
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325 } |
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326 |
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327 } |
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328 |
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329 private static class FixedSizeNodeStack { |
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330 |
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331 private final Object[] array; |
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332 |
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333 private int tos; |
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334 |
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335 FixedSizeNodeStack(Object[] array) { |
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336 this.array = array; |
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337 } |
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338 |
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339 boolean isFull() { |
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340 return tos == array.length; |
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341 } |
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342 |
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343 boolean isEmpty() { |
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344 return tos == 0; |
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345 } |
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346 |
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347 private void push(Object node) { |
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348 if (tos >= array.length) { |
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349 throw new ArrayIndexOutOfBoundsException(); |
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350 } |
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351 unsafe.putObject(array, Unsafe.ARRAY_OBJECT_BASE_OFFSET + Unsafe.ARRAY_OBJECT_INDEX_SCALE * (long) (tos++), node); |
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352 } |
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353 |
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354 private Object pop() { |
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355 if (tos <= 0) { |
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356 throw new ArrayIndexOutOfBoundsException(); |
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357 } |
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358 return unsafe.getObject(array, Unsafe.ARRAY_OBJECT_BASE_OFFSET + Unsafe.ARRAY_OBJECT_INDEX_SCALE * (long) (--tos)); |
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359 } |
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360 |
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361 private Object[] getArray() { |
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362 return array; |
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363 } |
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364 } |
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365 |
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366 } |