1 /*
2  * Copyright (c) 2012, 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
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 
25 package sun.jvm.hotspot.utilities;
26 
27 import java.util.Observable;
28 import java.util.Observer;
29 
30 import sun.jvm.hotspot.debugger.Address;
31 import sun.jvm.hotspot.oops.Metadata;
32 import sun.jvm.hotspot.oops.Klass;
33 import sun.jvm.hotspot.runtime.VM;
34 import sun.jvm.hotspot.types.Type;
35 import sun.jvm.hotspot.types.TypeDataBase;
36 import sun.jvm.hotspot.types.WrongTypeException;
37 
38 public class KlassArray extends GenericArray {
39   static {
VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } })40     VM.registerVMInitializedObserver(new Observer() {
41       public void update(Observable o, Object data) {
42         initialize(VM.getVM().getTypeDataBase());
43       }
44     });
45   }
46 
initialize(TypeDataBase db)47   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
48     elemType = db.lookupType("Klass*");
49 
50     Type type = db.lookupType("Array<Klass*>");
51     dataFieldOffset = type.getAddressField("_data").getOffset();
52   }
53 
54   private static long dataFieldOffset;
55   protected static Type elemType;
56 
KlassArray(Address addr)57   public KlassArray(Address addr) {
58     super(addr, dataFieldOffset);
59   }
60 
getAt(int i)61   public Klass getAt(int i) {
62     return (Klass) Metadata.instantiateWrapperFor(getAddressAt(i));
63   }
64 
getElemType()65   public Type getElemType() {
66     return elemType;
67   }
68 }
69