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 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.ci;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.memory.SystemDictionary;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.oops.*;
  33 import sun.jvm.hotspot.types.Type;
  34 import sun.jvm.hotspot.types.TypeDataBase;
  35 import sun.jvm.hotspot.types.WrongTypeException;
  36 
  37 public class ciInstanceKlass extends ciKlass {
  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     Type type      = db.lookupType("ciInstanceKlass");
  48     initStateField = new CIntField(type.getCIntegerField("_init_state"), 0);
  49     isSharedField = new CIntField(type.getCIntegerField("_is_shared"), 0);
  50     CLASS_STATE_LINKED = db.lookupIntConstant("instanceKlass::linked").intValue();
  51     CLASS_STATE_FULLY_INITIALIZED = db.lookupIntConstant("instanceKlass::fully_initialized").intValue();
  52   }
  53 
  54   private static CIntField initStateField;
  55   private static CIntField isSharedField;
  56   private static int CLASS_STATE_LINKED;
  57   private static int CLASS_STATE_FULLY_INITIALIZED;
  58 
  59   public ciInstanceKlass(Address addr) {
  60     super(addr);
  61   }
  62 
  63   public int initState() {
  64     int initState = (int)initStateField.getValue(getAddress());
  65     if (isShared() && initState < CLASS_STATE_LINKED) {
  66       InstanceKlass ik = (InstanceKlass)getOop();
  67       initState = ik.getInitStateAsInt();
  68     }
  69     return initState;
  70   }
  71 
  72   public boolean isShared() {
  73     return isSharedField.getValue(getAddress()) != 0;
  74   }
  75 
  76   public boolean isLinked() {
  77     return initState() >= CLASS_STATE_LINKED;
  78   }
  79 
  80   public boolean isInitialized() {
  81     return initState() == CLASS_STATE_FULLY_INITIALIZED;
  82   }
  83 }