| /* |
| * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.memory; |
| |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| |
| public class SystemDictionary { |
| private static AddressField dictionaryField; |
| private static AddressField sharedDictionaryField; |
| private static AddressField placeholdersField; |
| private static AddressField loaderConstraintTableField; |
| private static sun.jvm.hotspot.types.OopField javaSystemLoaderField; |
| |
| private static AddressField objectKlassField; |
| private static AddressField classLoaderKlassField; |
| private static AddressField stringKlassField; |
| private static AddressField systemKlassField; |
| private static AddressField threadKlassField; |
| private static AddressField threadGroupKlassField; |
| private static AddressField methodHandleKlassField; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) { |
| Type type = db.lookupType("SystemDictionary"); |
| |
| dictionaryField = type.getAddressField("_dictionary"); |
| sharedDictionaryField = type.getAddressField("_shared_dictionary"); |
| placeholdersField = type.getAddressField("_placeholders"); |
| loaderConstraintTableField = type.getAddressField("_loader_constraints"); |
| javaSystemLoaderField = type.getOopField("_java_system_loader"); |
| |
| objectKlassField = type.getAddressField(WK_KLASS("Object_klass")); |
| classLoaderKlassField = type.getAddressField(WK_KLASS("ClassLoader_klass")); |
| stringKlassField = type.getAddressField(WK_KLASS("String_klass")); |
| systemKlassField = type.getAddressField(WK_KLASS("System_klass")); |
| threadKlassField = type.getAddressField(WK_KLASS("Thread_klass")); |
| threadGroupKlassField = type.getAddressField(WK_KLASS("ThreadGroup_klass")); |
| methodHandleKlassField = type.getAddressField(WK_KLASS("MethodHandle_klass")); |
| } |
| |
| // This WK functions must follow the definitions in systemDictionary.hpp: |
| private static String WK_KLASS(String name) { |
| //#define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| return ("_well_known_klasses[SystemDictionary::"+WK_KLASS_ENUM_NAME(name)+"]"); |
| } |
| private static String WK_KLASS_ENUM_NAME(String kname) { |
| //#define WK_KLASS_ENUM_NAME(kname) kname##_knum |
| return (kname+"_knum"); |
| } |
| |
| public Dictionary dictionary() { |
| Address tmp = dictionaryField.getValue(); |
| return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); |
| } |
| |
| public Dictionary sharedDictionary() { |
| Address tmp = sharedDictionaryField.getValue(); |
| return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); |
| } |
| |
| public PlaceholderTable placeholders() { |
| Address tmp = placeholdersField.getValue(); |
| return (PlaceholderTable) VMObjectFactory.newObject(PlaceholderTable.class, tmp); |
| } |
| |
| public LoaderConstraintTable constraints() { |
| Address tmp = placeholdersField.getValue(); |
| return (LoaderConstraintTable) VMObjectFactory.newObject(LoaderConstraintTable.class, tmp); |
| } |
| |
| // few well known classes -- not all are added here. |
| // add more if needed. |
| public static InstanceKlass getThreadKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(threadKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getThreadGroupKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(threadGroupKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getObjectKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(objectKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getStringKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(stringKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getClassLoaderKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(classLoaderKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getSystemKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(systemKlassField.getValue()); |
| } |
| |
| public static InstanceKlass getMethodHandleKlass() { |
| return (InstanceKlass)Metadata.instantiateWrapperFor(methodHandleKlassField.getValue()); |
| } |
| |
| public InstanceKlass getAbstractOwnableSynchronizerKlass() { |
| return (InstanceKlass) find("java/util/concurrent/locks/AbstractOwnableSynchronizer", |
| null, null); |
| } |
| |
| public static Oop javaSystemLoader() { |
| return newOop(javaSystemLoaderField.getValue()); |
| } |
| |
| private static Oop newOop(OopHandle handle) { |
| return VM.getVM().getObjectHeap().newOop(handle); |
| } |
| |
| /** Lookup an already loaded class. If not found null is returned. */ |
| public Klass find(String className, Oop classLoader, Oop protectionDomain) { |
| Symbol sym = VM.getVM().getSymbolTable().probe(className); |
| if (sym == null) return null; |
| return find(sym, classLoader, protectionDomain); |
| } |
| |
| /** Lookup an already loaded class. If not found null is returned. */ |
| public Klass find(Symbol className, Oop classLoader, Oop protectionDomain) { |
| Dictionary dict = dictionary(); |
| long hash = dict.computeHash(className, classLoader); |
| int index = dict.hashToIndex(hash); |
| return dict.find(index, hash, className, classLoader, protectionDomain); |
| } |
| |
| /** Interface for iterating through all classes in dictionary */ |
| public static interface ClassVisitor { |
| public void visit(Klass k); |
| } |
| |
| /** Interface for iterating through all classes and their class |
| loaders in dictionary */ |
| public static interface ClassAndLoaderVisitor { |
| public void visit(Klass k, Oop loader); |
| } |
| |
| /** Iterate over all klasses - including object, primitive |
| array klasses */ |
| public void allClassesDo(final ClassVisitor v) { |
| ClassVisitor visitor = new ClassVisitor() { |
| public void visit(Klass k) { |
| for (Klass l = k; l != null; l = l.arrayKlassOrNull()) { |
| v.visit(l); |
| } |
| } |
| }; |
| classesDo(visitor); |
| VM.getVM().getUniverse().basicTypeClassesDo(visitor); |
| } |
| |
| /** Iterate over all klasses in dictionary; just the classes from |
| declaring class loaders */ |
| public void classesDo(ClassVisitor v) { |
| dictionary().classesDo(v); |
| } |
| |
| /** All classes, and their class loaders */ |
| public void classesDo(ClassAndLoaderVisitor v) { |
| dictionary().classesDo(v); |
| } |
| |
| /** All array classes of primitive type, and their class loaders */ |
| public void primArrayClassesDo(ClassAndLoaderVisitor v) { |
| placeholders().primArrayClassesDo(v); |
| } |
| } |