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
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.
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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
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23  */
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.runtime.VM;
32 import sun.jvm.hotspot.types.Type;
33 import sun.jvm.hotspot.types.TypeDataBase;
34 import sun.jvm.hotspot.types.WrongTypeException;
35 
36 public class U2Array extends GenericArray {
37   static {
VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } })38     VM.registerVMInitializedObserver(new Observer() {
39       public void update(Observable o, Object data) {
40         initialize(VM.getVM().getTypeDataBase());
41       }
42     });
43   }
44 
initialize(TypeDataBase db)45   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
46     elemType = db.lookupType("u2");
47     Type type = db.lookupType("Array<u2>");
48     dataFieldOffset = type.getAddressField("_data").getOffset();
49   }
50 
51   private static long dataFieldOffset;
52   protected static Type elemType;
53 
U2Array(Address addr)54   public U2Array(Address addr) {
55     super(addr, dataFieldOffset);
56   }
57 
at(int i)58   public short at(int i) {
59     return (short)getIntegerAt(i);
60   }
61 
getElemType()62   public Type getElemType() {
63     return elemType;
64   }
65 }
66