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1   /*
2    * Copyright (c) 2000, 2008, 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.oops;
26  
27  import java.io.*;
28  import java.util.*;
29  import sun.jvm.hotspot.debugger.*;
30  import sun.jvm.hotspot.runtime.*;
31  import sun.jvm.hotspot.types.*;
32  
33  // An ObjArray is an array containing oops
34  
35  public class ObjArray extends Array {
36    static {
37      VM.registerVMInitializedObserver(new Observer() {
38          public void update(Observable o, Object data) {
39            initialize(VM.getVM().getTypeDataBase());
40          }
41        });
42    }
43  
44    private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
45      Type type   = db.lookupType("objArrayOopDesc");
46      elementSize = VM.getVM().getHeapOopSize();
47    }
48  
49    ObjArray(OopHandle handle, ObjectHeap heap) {
50      super(handle, heap);
51    }
52  
53    public boolean isObjArray()          { return true; }
54  
55    private static long elementSize;
56  
57    public OopHandle getOopHandleAt(long index) {
58      long offset = baseOffsetInBytes(BasicType.T_OBJECT) + (index * elementSize);
59      if (VM.getVM().isCompressedOopsEnabled()) {
60        return getHandle().getCompOopHandleAt(offset);
61      } else {
62        return getHandle().getOopHandleAt(offset);
63      }
64    }
65  
66    public Oop getObjAt(long index) {
67        return getHeap().newOop(getOopHandleAt(index));
68    }
69  
70    public void printValueOn(PrintStream tty) {
71      tty.print("ObjArray");
72    }
73  
74    public void iterateFields(OopVisitor visitor, boolean doVMFields) {
75      super.iterateFields(visitor, doVMFields);
76      int length = (int) getLength();
77      long baseOffset = baseOffsetInBytes(BasicType.T_OBJECT);
78      for (int index = 0; index < length; index++) {
79        long offset = baseOffset + (index * elementSize);
80        OopField field;
81        if (VM.getVM().isCompressedOopsEnabled()) {
82          field = new NarrowOopField(new IndexableFieldIdentifier(index), offset, false);
83        } else {
84          field = new OopField(new IndexableFieldIdentifier(index), offset, false);
85        }
86        visitor.doOop(field, false);
87      }
88    }
89  }