1 /*
2  * Copyright (c) 2003, 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.memory;
26 
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.oops.*;
29 import sun.jvm.hotspot.runtime.*;
30 import sun.jvm.hotspot.utilities.*;
31 
32 public class PlaceholderTable extends TwoOopHashtable {
PlaceholderTable(Address addr)33   public PlaceholderTable(Address addr) {
34     super(addr);
35   }
36 
37   // this is overriden here so that Hashtable.bucket will return
38   // object of PlacholderEntry.class
getHashtableEntryClass()39   protected Class getHashtableEntryClass() {
40     return PlaceholderEntry.class;
41   }
42 
43   /** All array classes of primitive type, and their class loaders */
primArrayClassesDo(SystemDictionary.ClassAndLoaderVisitor v)44   public void primArrayClassesDo(SystemDictionary.ClassAndLoaderVisitor v) {
45     ObjectHeap heap = VM.getVM().getObjectHeap();
46     int tblSize = tableSize();
47     for (int index = 0; index < tblSize; index++) {
48       for (PlaceholderEntry probe = (PlaceholderEntry) bucket(index); probe != null;
49                                           probe = (PlaceholderEntry) probe.next()) {
50         Symbol sym = probe.klass();
51         // array of primitive arrays are stored in system dictionary as placeholders
52         FieldType ft = new FieldType(sym);
53         if (ft.isArray()) {
54           FieldType.ArrayInfo info = ft.getArrayInfo();
55           if (info.elementBasicType() != BasicType.getTObject()) {
56             Klass arrayKlass = heap.typeArrayKlassObj(info.elementBasicType());
57             arrayKlass = arrayKlass.arrayKlassOrNull(info.dimension());
58             v.visit(arrayKlass, probe.loader());
59           }
60         }
61       }
62     }
63   }
64 }
65