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
25package sun.jvm.hotspot.utilities;
26
27import java.util.Observable;
28import java.util.Observer;
29
30import sun.jvm.hotspot.debugger.Address;
31import sun.jvm.hotspot.runtime.VM;
32import sun.jvm.hotspot.types.Type;
33import sun.jvm.hotspot.types.TypeDataBase;
34import sun.jvm.hotspot.types.WrongTypeException;
35
36public 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}
66