StringTable.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2005, 2011, 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.memory;
26
27import java.io.*;
28import java.util.*;
29import sun.jvm.hotspot.debugger.*;
30import sun.jvm.hotspot.oops.*;
31import sun.jvm.hotspot.types.*;
32import sun.jvm.hotspot.runtime.*;
33import sun.jvm.hotspot.utilities.*;
34
35public class StringTable extends sun.jvm.hotspot.utilities.Hashtable {
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) {
45    Type type = db.lookupType("StringTable");
46    theTableField  = type.getAddressField("_the_table");
47  }
48
49  // Fields
50  private static AddressField theTableField;
51
52  // Accessors
53  public static StringTable getTheTable() {
54    Address tmp = theTableField.getValue();
55    return (StringTable) VMObjectFactory.newObject(StringTable.class, tmp);
56  }
57
58  public StringTable(Address addr) {
59    super(addr);
60  }
61
62  public interface StringVisitor {
63    public void visit(Instance string);
64  }
65
66  public void stringsDo(StringVisitor visitor) {
67    ObjectHeap oh = VM.getVM().getObjectHeap();
68    int numBuckets = tableSize();
69    for (int i = 0; i < numBuckets; i++) {
70      for (HashtableEntry e = (HashtableEntry) bucket(i); e != null;
71           e = (HashtableEntry) e.next()) {
72        Instance s = (Instance)oh.newOop(e.literalValue().addOffsetToAsOopHandle(0));
73        visitor.visit(s);
74      }
75    }
76  }
77}
78