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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  }