ObjArray.java revision 9883:903a2e023ffb 
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
25package sun.jvm.hotspot.oops;
26
27import java.io.*;
28import java.util.*;
29import sun.jvm.hotspot.debugger.*;
30import sun.jvm.hotspot.runtime.*;
31import sun.jvm.hotspot.types.*;
32
33// An ObjArray is an array containing oops
34
35public 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}
90