1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.oops;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.memory.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.types.*;
  33 import sun.jvm.hotspot.utilities.*;
  34 
  35 // An InstanceKlass is the VM level representation of a Java class.
  36 
  37 public class InstanceMirrorKlass extends InstanceKlass {
  38   static {
  39     VM.registerVMInitializedObserver(new Observer() {
  40         public void update(Observable o, Object data) {
  41           initialize(VM.getVM().getTypeDataBase());
  42         }
  43       });
  44   }
  45 
  46   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  47     // Just make sure it's there for now
  48     Type type = db.lookupType("instanceMirrorKlass");
  49   }
  50 
  51   InstanceMirrorKlass(OopHandle handle, ObjectHeap heap) {
  52     super(handle, heap);
  53   }
  54 
  55   public long getObjectSize(Oop o) {
  56     return java_lang_Class.getOopSize(o) * VM.getVM().getAddressSize();
  57   }
  58 
  59   public void iterateNonStaticFields(OopVisitor visitor, Oop obj) {
  60     super.iterateNonStaticFields(visitor, obj);
  61     // Fetch the real klass from the mirror object
  62     Klass klass = java_lang_Class.asKlass(obj);
  63     if (klass instanceof InstanceKlass) {
  64       ((InstanceKlass)klass).iterateStaticFields(visitor);
  65     }
  66   }
  67 }