Instance.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2000, 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.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 Instance is an instance of a Java Class
34
35public class Instance extends Oop {
36  static {
37    VM.registerVMInitializedObserver(new Observer() {
38        public void update(Observable o, Object data) {
39          initialize(VM.getVM().getTypeDataBase());
40        }
41      });
42  }
43  private static long typeSize;
44
45  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
46    Type type = db.lookupType("instanceOopDesc");
47    typeSize = type.getSize();
48  }
49
50  Instance(OopHandle handle, ObjectHeap heap) {
51    super(handle, heap);
52  }
53
54  // Returns header size in bytes.
55  public static long getHeaderSize() {
56    if (VM.getVM().isCompressedKlassPointersEnabled()) {
57      return typeSize - VM.getVM().getIntSize();
58    } else {
59      return typeSize;
60    }
61  }
62
63  public boolean isInstance()          { return true; }
64
65  public void iterateFields(OopVisitor visitor, boolean doVMFields) {
66    super.iterateFields(visitor, doVMFields);
67    ((InstanceKlass) getKlass()).iterateNonStaticFields(visitor, this);
68  }
69
70  public void printValueOn(PrintStream tty) {
71    // Special-case strings.
72    // FIXME: would like to do this in more type-safe fashion (need
73    // SystemDictionary analogue)
74    if (getKlass().getName().asString().equals("java/lang/String")) {
75      tty.print("\"" + OopUtilities.stringOopToString(this) + "\"");
76    } else {
77      super.printValueOn(tty);
78    }
79  }
80}
81