1 /* 2 * Copyright 2001-2008 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 33 public class SystemDictionary { 34 private static AddressField dictionaryField; 35 private static AddressField sharedDictionaryField; 36 private static AddressField placeholdersField; 37 private static AddressField loaderConstraintTableField; 38 private static sun.jvm.hotspot.types.OopField javaSystemLoaderField; 39 private static int nofBuckets; 40 41 private static sun.jvm.hotspot.types.OopField objectKlassField; 42 private static sun.jvm.hotspot.types.OopField classLoaderKlassField; 43 private static sun.jvm.hotspot.types.OopField stringKlassField; 44 private static sun.jvm.hotspot.types.OopField systemKlassField; 45 private static sun.jvm.hotspot.types.OopField threadKlassField; 46 private static sun.jvm.hotspot.types.OopField threadGroupKlassField; 47 48 static { 49 VM.registerVMInitializedObserver(new Observer() { 50 public void update(Observable o, Object data) { 51 initialize(VM.getVM().getTypeDataBase()); 52 } 53 }); 54 } 55 56 private static synchronized void initialize(TypeDataBase db) { 57 Type type = db.lookupType("SystemDictionary"); 58 59 dictionaryField = type.getAddressField("_dictionary"); 60 sharedDictionaryField = type.getAddressField("_shared_dictionary"); 61 placeholdersField = type.getAddressField("_placeholders"); 62 loaderConstraintTableField = type.getAddressField("_loader_constraints"); 63 javaSystemLoaderField = type.getOopField("_java_system_loader"); 64 nofBuckets = db.lookupIntConstant("SystemDictionary::_nof_buckets").intValue(); 65 66 objectKlassField = type.getOopField(WK_KLASS("object_klass")); 67 classLoaderKlassField = type.getOopField(WK_KLASS("classloader_klass")); 68 stringKlassField = type.getOopField(WK_KLASS("string_klass")); 69 systemKlassField = type.getOopField(WK_KLASS("system_klass")); 70 threadKlassField = type.getOopField(WK_KLASS("thread_klass")); 71 threadGroupKlassField = type.getOopField(WK_KLASS("threadGroup_klass")); 72 } 73 74 // This WK functions must follow the definitions in systemDictionary.hpp: 75 private static String WK_KLASS(String name) { 76 //#define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] 77 return ("_well_known_klasses[SystemDictionary::"+WK_KLASS_ENUM_NAME(name)+"]"); 78 } 79 private static String WK_KLASS_ENUM_NAME(String kname) { 80 //#define WK_KLASS_ENUM_NAME(kname) kname##_knum 81 return (kname+"_knum"); 82 } 83 84 public Dictionary dictionary() { 85 Address tmp = dictionaryField.getValue(); 86 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); 87 } 88 89 public Dictionary sharedDictionary() { 90 Address tmp = sharedDictionaryField.getValue(); 91 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); 92 } 93 94 public PlaceholderTable placeholders() { 95 Address tmp = placeholdersField.getValue(); 96 return (PlaceholderTable) VMObjectFactory.newObject(PlaceholderTable.class, tmp); 97 } 98 99 public LoaderConstraintTable constraints() { 100 Address tmp = placeholdersField.getValue(); 101 return (LoaderConstraintTable) VMObjectFactory.newObject(LoaderConstraintTable.class, tmp); 102 } 103 104 // few well known classes -- not all are added here. 105 // add more if needed. 106 public static InstanceKlass getThreadKlass() { 107 return (InstanceKlass) newOop(threadKlassField.getValue()); 108 } 109 110 public static InstanceKlass getThreadGroupKlass() { 111 return (InstanceKlass) newOop(threadGroupKlassField.getValue()); 112 } 113 114 public static InstanceKlass getObjectKlass() { 115 return (InstanceKlass) newOop(objectKlassField.getValue()); 116 } 117 118 public static InstanceKlass getStringKlass() { 119 return (InstanceKlass) newOop(stringKlassField.getValue()); 120 } 121 122 public static InstanceKlass getClassLoaderKlass() { 123 return (InstanceKlass) newOop(classLoaderKlassField.getValue()); 124 } 125 126 public static InstanceKlass getSystemKlass() { 127 return (InstanceKlass) newOop(systemKlassField.getValue()); 128 } 129 130 public InstanceKlass getAbstractOwnableSynchronizerKlass() { 131 return (InstanceKlass) find("java/util/concurrent/locks/AbstractOwnableSynchronizer", 132 null, null); 133 } 134 135 public static Oop javaSystemLoader() { 136 return newOop(javaSystemLoaderField.getValue()); 137 } 138 139 public static int getNumOfBuckets() { 140 return nofBuckets; 141 } 142 143 private static Oop newOop(OopHandle handle) { 144 return VM.getVM().getObjectHeap().newOop(handle); 145 } 146 147 /** Lookup an already loaded class. If not found null is returned. */ 148 public Klass find(String className, Oop classLoader, Oop protectionDomain) { 149 Symbol sym = VM.getVM().getSymbolTable().probe(className); 150 if (sym == null) return null; 151 return find(sym, classLoader, protectionDomain); 152 } 153 154 /** Lookup an already loaded class. If not found null is returned. */ 155 public Klass find(Symbol className, Oop classLoader, Oop protectionDomain) { 156 Dictionary dict = dictionary(); 157 long hash = dict.computeHash(className, classLoader); 158 int index = dict.hashToIndex(hash); 159 return dict.find(index, hash, className, classLoader, protectionDomain); 160 } 161 162 /** Interface for iterating through all classes in dictionary */ 163 public static interface ClassVisitor { 164 public void visit(Klass k); 165 } 166 167 /** Interface for iterating through all classes and their class 168 loaders in dictionary */ 169 public static interface ClassAndLoaderVisitor { 170 public void visit(Klass k, Oop loader); 171 } 172 173 /** Iterate over all klasses - including object, primitive 174 array klasses */ 175 public void allClassesDo(final ClassVisitor v) { 176 ClassVisitor visitor = new ClassVisitor() { 177 public void visit(Klass k) { 178 for (Klass l = k; l != null; l = l.arrayKlassOrNull()) { 179 v.visit(l); 180 } 181 } 182 }; 183 classesDo(visitor); 184 VM.getVM().getUniverse().basicTypeClassesDo(visitor); 185 } 186 187 /** Iterate over all klasses in dictionary; just the classes from 188 declaring class loaders */ 189 public void classesDo(ClassVisitor v) { 190 dictionary().classesDo(v); 191 } 192 193 /** All classes, and their class loaders */ 194 public void classesDo(ClassAndLoaderVisitor v) { 195 dictionary().classesDo(v); 196 } 197 198 /** All array classes of primitive type, and their class loaders */ 199 public void primArrayClassesDo(ClassAndLoaderVisitor v) { 200 placeholders().primArrayClassesDo(v); 201 } 202 }