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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotJVMCIMetaAccessContext.java @ 23710:927a39cd7ddd

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Use ClassValue instead of WeakHashMap to track ResolvedJavaTypes
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 21 Jun 2016 14:36:31 -0700
parents eb166b568645
children 05922ce51c5e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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1bbd4a7c274b Rename jdk.internal.jvmci to jdk.vm.ci
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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
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31 import jdk.vm.ci.meta.JavaKind;
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32 import jdk.vm.ci.meta.ResolvedJavaType;
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33
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34 /**
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35 * This class manages the set of metadata roots that must be scanned during garbage collection.
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36 * Because of class redefinition Method* and ConstantPool* can be freed if they don't appear to be
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37 * in use so they must be tracked when there are live references to them from Java.
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38 *
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39 * The general theory of operation is that all {@link MetaspaceWrapperObject}s are created by
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40 * calling into the VM which calls back out to actually create the wrapper instance. During the call
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41 * the VM keeps the metadata reference alive through the use of metadata handles. Once the call
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42 * completes the wrapper object is registered here and will be scanned during metadata scanning. The
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43 * weakness of the reference to the wrapper object allows them to be reclaimed when they are no
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44 * longer used.
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45 *
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46 */
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47 public class HotSpotJVMCIMetaAccessContext {
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48
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49 /**
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50 * The set of currently live contexts used for tracking of live metadata. Examined from the VM
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51 * during garbage collection.
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52 */
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53 private static WeakReference<?>[] allContexts = new WeakReference<?>[0];
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54
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55 /**
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56 * This is a chunked list of metadata roots. It can be read from VM native code so it's been
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57 * marked volatile to ensure the order of updates are respected.
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58 */
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59 private volatile Object[] metadataRoots;
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60
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61 private ChunkedList<WeakReference<MetaspaceWrapperObject>> list = new ChunkedList<>();
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62
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63 /**
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64 * The number of weak references freed since the last time the list was shrunk.
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65 */
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66 private int freed;
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67
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68 /**
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69 * The {@link ReferenceQueue} tracking the weak references created by this context.
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70 */
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71 private final ReferenceQueue<MetaspaceWrapperObject> queue = new ReferenceQueue<>();
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72
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73 static synchronized void add(HotSpotJVMCIMetaAccessContext context) {
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74 for (int i = 0; i < allContexts.length; i++) {
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75 if (allContexts[i] == null || allContexts[i].get() == null) {
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76 allContexts[i] = new WeakReference<>(context);
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77 return;
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78 }
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79 }
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80 int index = allContexts.length;
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81 allContexts = Arrays.copyOf(allContexts, index + 2);
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82 allContexts[index] = new WeakReference<>(context);
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83 }
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84
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85 HotSpotJVMCIMetaAccessContext() {
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86 add(this);
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87 }
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88
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89 /**
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90 * Periodically trim the list of tracked metadata. A new list is created to replace the old to
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91 * avoid concurrent scanning issues.
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92 */
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93 private void clean() {
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94 Reference<?> ref = queue.poll();
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95 if (ref == null) {
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96 return;
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97 }
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98 while (ref != null) {
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99 freed++;
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100 ref = queue.poll();
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101 }
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102 if (freed > list.size() / 2) {
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103 ChunkedList<WeakReference<MetaspaceWrapperObject>> newList = new ChunkedList<>();
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104 for (WeakReference<MetaspaceWrapperObject> element : list) {
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105 /*
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106 * The referent could become null anywhere in here but it doesn't matter. It will
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107 * get cleaned up next time.
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108 */
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109 if (element != null && element.get() != null) {
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110 newList.add(element);
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111 }
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112 }
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113 list = newList;
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114 metadataRoots = list.getHead();
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115 freed = 0;
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116 }
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117 }
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118
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119 /**
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120 * Add a {@link MetaspaceWrapperObject} to tracked by the GC. It's assumed that the caller is
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121 * responsible for keeping the reference alive for the duration of the call. Once registration
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122 * is complete then the VM will ensure it's kept alive.
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123 *
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124 * @param metaspaceObject
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125 */
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126
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127 public synchronized void add(MetaspaceWrapperObject metaspaceObject) {
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128 clean();
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129 list.add(new WeakReference<>(metaspaceObject, queue));
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130 if (list.getHead() != metadataRoots) {
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131 /*
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132 * The list enlarged so update the head.
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133 */
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134 metadataRoots = list.getHead();
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135 }
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136 assert isRegistered(metaspaceObject);
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137 }
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138
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139 protected ResolvedJavaType createClass(Class<?> javaClass) {
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140 if (javaClass.isPrimitive()) {
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141 JavaKind kind = JavaKind.fromJavaClass(javaClass);
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142 return new HotSpotResolvedPrimitiveType(kind);
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143 } else {
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144 return new HotSpotResolvedObjectTypeImpl(javaClass, this);
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145 }
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146 }
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147
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148 private final ClassValue<ResolvedJavaType> resolvedJavaType = new ClassValue<ResolvedJavaType>() {
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149 @Override
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150 protected ResolvedJavaType computeValue(Class<?> type) {
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151 return createClass(type);
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152 }
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153 };
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154
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155 /**
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156 * Gets the JVMCI mirror for a {@link Class} object.
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157 *
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158 * @return the {@link ResolvedJavaType} corresponding to {@code javaClass}
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159 */
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160 public synchronized ResolvedJavaType fromClass(Class<?> javaClass) {
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161 return resolvedJavaType.get(javaClass);
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162 }
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163
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164 /**
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165 * A very simple append only chunked list implementation.
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166 */
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167 static class ChunkedList<T> implements Iterable<T> {
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168 private static final int CHUNK_SIZE = 32;
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169
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170 private static final int NEXT_CHUNK_INDEX = CHUNK_SIZE - 1;
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171
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172 private Object[] head;
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173 private int index;
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174 private int size;
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175
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176 ChunkedList() {
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177 head = new Object[CHUNK_SIZE];
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178 index = 0;
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179 }
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180
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181 void add(T element) {
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182 if (index == NEXT_CHUNK_INDEX) {
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183 Object[] newHead = new Object[CHUNK_SIZE];
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184 newHead[index] = head;
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185 head = newHead;
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186 index = 0;
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187 }
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188 head[index++] = element;
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189 size++;
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190 }
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191
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192 Object[] getHead() {
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193 return head;
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194 }
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195
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196 public Iterator<T> iterator() {
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197 return new ChunkIterator<>();
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198 }
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199
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200 int size() {
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201 return size;
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202 }
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203
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204 class ChunkIterator<V> implements Iterator<V> {
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205
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206 ChunkIterator() {
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207 currentChunk = head;
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208 currentIndex = -1;
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209 next = findNext();
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210 }
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211
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212 Object[] currentChunk;
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213 int currentIndex;
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214 V next;
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215
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216 @SuppressWarnings("unchecked")
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217 V findNext() {
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218 V result;
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219 do {
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220 currentIndex++;
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221 if (currentIndex == NEXT_CHUNK_INDEX) {
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222 currentChunk = (Object[]) currentChunk[currentIndex];
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223 currentIndex = 0;
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224 if (currentChunk == null) {
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225 return null;
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226 }
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227 }
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228 result = (V) currentChunk[currentIndex];
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229 } while (result == null);
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230 return result;
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231 }
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232
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233 public boolean hasNext() {
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234 return next != null;
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235 }
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236
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237 public V next() {
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238 V result = next;
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239 next = findNext();
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240 return result;
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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 }
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246
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247 synchronized boolean isRegistered(MetaspaceWrapperObject wrapper) {
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248 for (WeakReference<MetaspaceWrapperObject> m : list) {
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249 if (m != null && m.get() == wrapper) {
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250 return true;
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251 }
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252 }
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253 return false;
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254 }
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255 }