| /* |
| * Copyright (c) 2011, 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.oops; |
| |
| import java.util.*; |
| |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.memory.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.AddressField; |
| import sun.jvm.hotspot.types.Type; |
| import sun.jvm.hotspot.types.TypeDataBase; |
| import sun.jvm.hotspot.utilities.*; |
| import sun.jvm.hotspot.jdi.JVMTIThreadState; |
| |
| /** A utility class encapsulating useful oop operations */ |
| |
| // initialize fields for java.lang.Class |
| public class java_lang_Class { |
| |
| // java.lang.Class fields |
| static int klassOffset; |
| static IntField oopSizeField; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) { |
| // klass and oop_size are HotSpot magic fields and hence we can't |
| // find them from InstanceKlass for java.lang.Class. |
| Type jlc = db.lookupType("java_lang_Class"); |
| klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue(); |
| int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue(); |
| oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true); |
| } |
| |
| /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */ |
| public static Klass asKlass(Oop aClass) { |
| return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset)); |
| } |
| |
| /** get oop_size field at offset oop_size_offset from a java.lang.Class object */ |
| public static long getOopSize(Oop aClass) { |
| return java_lang_Class.oopSizeField.getValue(aClass); |
| } |
| } |