Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/utilities/BasicHashtable.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.utilities; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.types.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 | |
32 // Superclass for symbol and string tables. | |
33 | |
34 public class BasicHashtable extends VMObject { | |
35 static { | |
36 VM.registerVMInitializedObserver(new Observer() { | |
37 public void update(Observable o, Object data) { | |
38 initialize(VM.getVM().getTypeDataBase()); | |
39 } | |
40 }); | |
41 } | |
42 | |
43 private static synchronized void initialize(TypeDataBase db) { | |
44 Type type = db.lookupType("BasicHashtable"); | |
45 tableSizeField = type.getCIntegerField("_table_size"); | |
46 bucketsField = type.getAddressField("_buckets"); | |
47 bucketSize = db.lookupType("HashtableBucket").getSize(); | |
48 } | |
49 | |
50 // Fields | |
51 private static CIntegerField tableSizeField; | |
52 private static AddressField bucketsField; | |
53 private static long bucketSize; | |
54 | |
55 // Accessors | |
56 protected int tableSize() { | |
57 return (int) tableSizeField.getValue(addr); | |
58 } | |
59 | |
60 protected BasicHashtableEntry bucket(int i) { | |
61 if (Assert.ASSERTS_ENABLED) { | |
62 Assert.that(i >= 0 && i < tableSize(), "Invalid bucket id"); | |
63 } | |
64 Address tmp = bucketsField.getValue(addr); | |
65 tmp = tmp.addOffsetTo(i * bucketSize); | |
66 HashtableBucket bucket = (HashtableBucket) VMObjectFactory.newObject( | |
67 HashtableBucket.class, tmp); | |
68 return bucket.getEntry(getHashtableEntryClass()); | |
69 } | |
70 | |
71 // derived class may return Class<? extends BasicHashtableEntry> | |
72 protected Class getHashtableEntryClass() { | |
73 return BasicHashtableEntry.class; | |
74 } | |
75 | |
76 public BasicHashtable(Address addr) { | |
77 super(addr); | |
78 } | |
79 } |