| /* |
| * Copyright (c) 2001, 2017, 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.classfile.*; |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| |
| public class SystemDictionary { |
| private static AddressField sharedDictionaryField; |
| 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"); |
| |
| sharedDictionaryField = type.getAddressField("_shared_dictionary"); |
| 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 sharedDictionary() { |
| Address tmp = sharedDictionaryField.getValue(); |
| return (Dictionary) VMObjectFactory.newObject(Dictionary.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() { |
| ClassLoaderDataGraph cldg = VM.getVM().getClassLoaderDataGraph(); |
| return (InstanceKlass) cldg.find("java/util/concurrent/locks/AbstractOwnableSynchronizer"); |
| } |
| |
| public static Oop javaSystemLoader() { |
| return newOop(javaSystemLoaderField.getValue()); |
| } |
| |
| private static Oop newOop(OopHandle handle) { |
| return VM.getVM().getObjectHeap().newOop(handle); |
| } |
| } |