Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotJVMCIMetaAccessContext.java @ 23366:45168ac6d3bc
Merge.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Fri, 29 Apr 2016 11:10:18 +0200 |
parents | 1bbd4a7c274b |
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1 /* |
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2 * Copyright (c) 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. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package jdk.vm.ci.hotspot; |
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24 |
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25 import java.lang.ref.Reference; |
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26 import java.lang.ref.ReferenceQueue; |
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27 import java.lang.ref.WeakReference; |
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28 import java.util.Arrays; |
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29 import java.util.Iterator; |
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30 import java.util.Map; |
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31 import java.util.WeakHashMap; |
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32 |
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33 import jdk.vm.ci.meta.JVMCIMetaAccessContext; |
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34 import jdk.vm.ci.meta.JavaKind; |
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35 import jdk.vm.ci.meta.ResolvedJavaType; |
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36 |
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37 /** |
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38 * This class manages the set of metadata roots that must be scanned during garbage collection. |
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39 * Because of class redefinition Method* and ConstantPool* can be freed if they don't appear to be |
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40 * in use so they must be tracked when there are live references to them from Java. |
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41 * |
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42 * The general theory of operation is that all {@link MetaspaceWrapperObject}s are created by |
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43 * calling into the VM which calls back out to actually create the wrapper instance. During the call |
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44 * the VM keeps the metadata reference alive through the use of metadata handles. Once the call |
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45 * completes the wrapper object is registered here and will be scanned during metadata scanning. The |
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46 * weakness of the reference to the wrapper object allows them to be reclaimed when they are no |
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47 * longer used. |
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48 * |
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49 */ |
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50 public class HotSpotJVMCIMetaAccessContext implements JVMCIMetaAccessContext { |
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51 |
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52 /** |
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53 * The set of currently live contexts used for tracking of live metadata. Examined from the VM |
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54 * during garbage collection. |
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55 */ |
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56 private static WeakReference<?>[] allContexts = new WeakReference<?>[0]; |
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57 |
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58 /** |
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59 * This is a chunked list of metadata roots. It can be read from VM native code so it's been |
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60 * marked volatile to ensure the order of updates are respected. |
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61 */ |
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62 private volatile Object[] metadataRoots; |
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63 |
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64 private ChunkedList<WeakReference<MetaspaceWrapperObject>> list = new ChunkedList<>(); |
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65 |
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66 /** |
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67 * The number of weak references freed since the last time the list was shrunk. |
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68 */ |
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69 private int freed; |
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70 |
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71 /** |
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72 * The {@link ReferenceQueue} tracking the weak references created by this context. |
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73 */ |
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74 private final ReferenceQueue<MetaspaceWrapperObject> queue = new ReferenceQueue<>(); |
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75 |
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76 static synchronized void add(HotSpotJVMCIMetaAccessContext context) { |
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77 for (int i = 0; i < allContexts.length; i++) { |
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78 if (allContexts[i] == null || allContexts[i].get() == null) { |
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79 allContexts[i] = new WeakReference<>(context); |
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80 return; |
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81 } |
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82 } |
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83 int index = allContexts.length; |
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84 allContexts = Arrays.copyOf(allContexts, index + 2); |
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85 allContexts[index] = new WeakReference<>(context); |
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86 } |
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87 |
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88 HotSpotJVMCIMetaAccessContext() { |
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89 add(this); |
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90 } |
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91 |
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92 /** |
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93 * Periodically trim the list of tracked metadata. A new list is created to replace the old to |
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94 * avoid concurrent scanning issues. |
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95 */ |
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96 private void clean() { |
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97 Reference<?> ref = queue.poll(); |
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98 if (ref == null) { |
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99 return; |
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100 } |
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101 while (ref != null) { |
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102 freed++; |
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103 ref = queue.poll(); |
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104 } |
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105 if (freed > list.size() / 2) { |
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106 ChunkedList<WeakReference<MetaspaceWrapperObject>> newList = new ChunkedList<>(); |
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107 for (WeakReference<MetaspaceWrapperObject> element : list) { |
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108 /* |
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109 * The referent could become null anywhere in here but it doesn't matter. It will |
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110 * get cleaned up next time. |
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111 */ |
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112 if (element != null && element.get() != null) { |
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113 newList.add(element); |
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114 } |
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115 } |
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116 list = newList; |
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117 metadataRoots = list.getHead(); |
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118 freed = 0; |
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119 } |
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120 } |
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121 |
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122 /** |
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123 * Add a {@link MetaspaceWrapperObject} to tracked by the GC. It's assumed that the caller is |
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124 * responsible for keeping the reference alive for the duration of the call. Once registration |
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125 * is complete then the VM will ensure it's kept alive. |
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126 * |
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127 * @param metaspaceObject |
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128 */ |
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129 |
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130 public synchronized void add(MetaspaceWrapperObject metaspaceObject) { |
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131 clean(); |
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132 list.add(new WeakReference<>(metaspaceObject, queue)); |
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133 if (list.getHead() != metadataRoots) { |
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134 /* |
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135 * The list enlarged so update the head. |
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136 */ |
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137 metadataRoots = list.getHead(); |
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138 } |
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139 } |
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140 |
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141 protected ResolvedJavaType createClass(Class<?> javaClass) { |
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142 if (javaClass.isPrimitive()) { |
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143 JavaKind kind = JavaKind.fromJavaClass(javaClass); |
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144 return new HotSpotResolvedPrimitiveType(kind); |
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145 } else { |
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146 return new HotSpotResolvedObjectTypeImpl(javaClass, this); |
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147 } |
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148 } |
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149 |
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150 private final Map<Class<?>, WeakReference<ResolvedJavaType>> typeMap = new WeakHashMap<>(); |
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151 |
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152 @Override |
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153 public synchronized ResolvedJavaType fromClass(Class<?> javaClass) { |
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154 WeakReference<ResolvedJavaType> typeRef = typeMap.get(javaClass); |
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155 ResolvedJavaType type = typeRef != null ? typeRef.get() : null; |
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156 if (type == null) { |
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157 type = createClass(javaClass); |
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158 typeMap.put(javaClass, new WeakReference<>(type)); |
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159 } |
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160 return type; |
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161 } |
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162 |
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163 /** |
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164 * A very simple append only chunked list implementation. |
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165 */ |
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166 static class ChunkedList<T> implements Iterable<T> { |
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167 private static final int CHUNK_SIZE = 32; |
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168 |
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169 private static final int NEXT_CHUNK_INDEX = CHUNK_SIZE - 1; |
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170 |
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171 private Object[] head; |
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172 private int index; |
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173 private int size; |
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174 |
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175 ChunkedList() { |
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176 head = new Object[CHUNK_SIZE]; |
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177 index = 0; |
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178 } |
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179 |
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180 void add(T element) { |
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181 if (index == NEXT_CHUNK_INDEX) { |
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182 Object[] newHead = new Object[CHUNK_SIZE]; |
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183 newHead[index] = head; |
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184 head = newHead; |
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185 index = 0; |
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186 } |
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187 head[index++] = element; |
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188 size++; |
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189 } |
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190 |
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191 Object[] getHead() { |
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192 return head; |
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193 } |
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194 |
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195 public Iterator<T> iterator() { |
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196 return new ChunkIterator<>(); |
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197 } |
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198 |
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199 int size() { |
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200 return size; |
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201 } |
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202 |
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203 class ChunkIterator<V> implements Iterator<V> { |
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204 |
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205 ChunkIterator() { |
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206 currentChunk = head; |
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207 currentIndex = -1; |
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208 findNext(); |
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209 } |
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210 |
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211 Object[] currentChunk; |
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212 int currentIndex; |
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213 V next; |
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214 |
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215 @SuppressWarnings("unchecked") |
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216 V findNext() { |
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217 V result; |
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218 do { |
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219 currentIndex++; |
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220 if (currentIndex == NEXT_CHUNK_INDEX) { |
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221 currentChunk = (Object[]) currentChunk[currentIndex]; |
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222 currentIndex = 0; |
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223 if (currentChunk == null) { |
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224 return null; |
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225 } |
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226 } |
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227 result = (V) currentChunk[currentIndex]; |
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228 } while (result == null); |
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229 return result; |
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230 } |
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231 |
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232 public boolean hasNext() { |
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233 return next != null; |
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234 } |
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235 |
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236 public V next() { |
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237 V result = next; |
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238 next = findNext(); |
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239 return result; |
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240 } |
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241 |
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242 } |
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243 |
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244 } |
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245 } |