rev 2 : [mq]: wkk.patch
1 /* 2 * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.memory; 26 27 import java.util.*; 28 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.oops.*; 30 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.types.*; 32 import sun.jvm.hotspot.types.OopField; // resolve ambiguity with oops.OopField 33 34 // following needed for on-the-fly field construction: 35 import sun.jvm.hotspot.types.basic.BasicOopField; 36 import sun.jvm.hotspot.types.basic.BasicTypeDataBase; 37 38 public class SystemDictionary { 39 private static AddressField dictionaryField; 40 private static AddressField sharedDictionaryField; 41 private static AddressField placeholdersField; 42 private static AddressField loaderConstraintTableField; 43 private static OopField javaSystemLoaderField; 44 private static int nofBuckets; 45 46 private static OopField wellKnownKlasses; 47 private static OopField objectKlassField; 48 private static OopField classLoaderKlassField; 49 private static OopField stringKlassField; 50 private static OopField systemKlassField; 51 private static OopField threadKlassField; 52 private static OopField threadGroupKlassField; 53 54 static { 55 VM.registerVMInitializedObserver(new Observer() { 56 public void update(Observable o, Object data) { 57 initialize(VM.getVM().getTypeDataBase()); 58 } 59 }); 60 } 61 62 private static synchronized void initialize(TypeDataBase db) { 63 Type type = db.lookupType("SystemDictionary"); 64 65 dictionaryField = type.getAddressField("_dictionary"); 66 sharedDictionaryField = type.getAddressField("_shared_dictionary"); 67 placeholdersField = type.getAddressField("_placeholders"); 68 loaderConstraintTableField = type.getAddressField("_loader_constraints"); 69 javaSystemLoaderField = type.getOopField("_java_system_loader"); 70 nofBuckets = db.lookupIntConstant("SystemDictionary::_nof_buckets").intValue(); 71 72 wellKnownKlasses = type.getOopField("_well_known_klasses[0]"); 73 objectKlassField = findWellKnownKlass("object_klass", type, db); 74 classLoaderKlassField = findWellKnownKlass("classloader_klass", type, db); 75 stringKlassField = findWellKnownKlass("string_klass", type, db); 76 systemKlassField = findWellKnownKlass("system_klass", type, db); 77 threadKlassField = findWellKnownKlass("thread_klass", type, db); 78 threadGroupKlassField = findWellKnownKlass("threadGroup_klass", type, db); 79 } 80 81 private static OopField findWellKnownKlass(String indexName, Type type, TypeDataBase db) { 82 Address wkk = wellKnownKlasses.getStaticFieldAddress(); 83 int index = db.lookupIntConstant("SystemDictionary::#"+indexName).intValue(); 84 return new BasicOopField((BasicTypeDataBase)db, type, indexName, type, 85 true, index * db.getAddressSize(), wkk); 86 } 87 88 public Dictionary dictionary() { 89 Address tmp = dictionaryField.getValue(); 90 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); 91 } 92 93 public Dictionary sharedDictionary() { 94 Address tmp = sharedDictionaryField.getValue(); 95 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); 96 } 97 98 public PlaceholderTable placeholders() { 99 Address tmp = placeholdersField.getValue(); 100 return (PlaceholderTable) VMObjectFactory.newObject(PlaceholderTable.class, tmp); 101 } 102 103 public LoaderConstraintTable constraints() { 104 Address tmp = placeholdersField.getValue(); 105 return (LoaderConstraintTable) VMObjectFactory.newObject(LoaderConstraintTable.class, tmp); 106 } 107 108 // few well known classes -- not all are added here. 109 // add more if needed. 110 public static InstanceKlass getThreadKlass() { 111 return (InstanceKlass) newOop(threadKlassField.getValue()); 112 } 113 114 public static InstanceKlass getThreadGroupKlass() { 115 return (InstanceKlass) newOop(threadGroupKlassField.getValue()); 116 } 117 118 public static InstanceKlass getObjectKlass() { 119 return (InstanceKlass) newOop(objectKlassField.getValue()); 120 } 121 122 public static InstanceKlass getStringKlass() { 123 return (InstanceKlass) newOop(stringKlassField.getValue()); 124 } 125 126 public static InstanceKlass getClassLoaderKlass() { 127 return (InstanceKlass) newOop(classLoaderKlassField.getValue()); 128 } 129 130 public static InstanceKlass getSystemKlass() { 131 return (InstanceKlass) newOop(systemKlassField.getValue()); 132 } 133 134 public InstanceKlass getAbstractOwnableSynchronizerKlass() { 135 return (InstanceKlass) find("java/util/concurrent/locks/AbstractOwnableSynchronizer", 136 null, null); 137 } 138 139 public static Oop javaSystemLoader() { 140 return newOop(javaSystemLoaderField.getValue()); 141 } 142 143 public static int getNumOfBuckets() { 144 return nofBuckets; 145 } 146 147 private static Oop newOop(OopHandle handle) { 148 return VM.getVM().getObjectHeap().newOop(handle); 149 } 150 151 /** Lookup an already loaded class. If not found null is returned. */ 152 public Klass find(String className, Oop classLoader, Oop protectionDomain) { 153 Symbol sym = VM.getVM().getSymbolTable().probe(className); 154 if (sym == null) return null; 155 return find(sym, classLoader, protectionDomain); 156 } 157 158 /** Lookup an already loaded class. If not found null is returned. */ 159 public Klass find(Symbol className, Oop classLoader, Oop protectionDomain) { 160 Dictionary dict = dictionary(); 161 long hash = dict.computeHash(className, classLoader); 162 int index = dict.hashToIndex(hash); 163 return dict.find(index, hash, className, classLoader, protectionDomain); 164 } 165 166 /** Interface for iterating through all classes in dictionary */ 167 public static interface ClassVisitor { 168 public void visit(Klass k); 169 } 170 171 /** Interface for iterating through all classes and their class 172 loaders in dictionary */ 173 public static interface ClassAndLoaderVisitor { 174 public void visit(Klass k, Oop loader); 175 } 176 177 /** Iterate over all klasses - including object, primitive 178 array klasses */ 179 public void allClassesDo(final ClassVisitor v) { 180 ClassVisitor visitor = new ClassVisitor() { 181 public void visit(Klass k) { 182 for (Klass l = k; l != null; l = l.arrayKlassOrNull()) { 183 v.visit(l); 184 } 185 } 186 }; 187 classesDo(visitor); 188 VM.getVM().getUniverse().basicTypeClassesDo(visitor); 189 } 190 191 /** Iterate over all klasses in dictionary; just the classes from 192 declaring class loaders */ 193 public void classesDo(ClassVisitor v) { 194 dictionary().classesDo(v); 195 } 196 197 /** All classes, and their class loaders */ 198 public void classesDo(ClassAndLoaderVisitor v) { 199 dictionary().classesDo(v); 200 } 201 202 /** All array classes of primitive type, and their class loaders */ 203 public void primArrayClassesDo(ClassAndLoaderVisitor v) { 204 placeholders().primArrayClassesDo(v); 205 } 206 } --- EOF ---