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.

    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.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 {

    38     VM.registerVMInitializedObserver(new Observer() {

    39       public void update(Observable o, Object data) {

    40         initialize(VM.getVM().getTypeDataBase());

    41       }

    42     });

    43   }

    44 

    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 

    54   public U2Array(Address addr) {

    55     super(addr, dataFieldOffset);

    56   }

    57 

    58   public short at(int i) {

    59     return (short)getIntegerAt(i);

    60   }

    61 

    62   public Type getElemType() {

    63     return elemType;

    64   }

    65 }