Mercurial > hg > truffle

comparison agent/src/share/classes/sun/jvm/hotspot/memory/CMSBitMap.java @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children 9d4dd91c4a0a
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2007 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.memory;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 public class CMSBitMap extends VMObject {
35 private static AddressField bmStartWordField;
36 private static CIntegerField bmWordSizeField;
37 private static CIntegerField shifterField;
38 //private static AddressField bmField;
39 private static long virtualSpaceFieldOffset;
40
41 public CMSBitMap(Address addr) {
42 super(addr);
43 }
44
45 static {
46 VM.registerVMInitializedObserver(new Observer() {
47 public void update(Observable o, Object data) {
48 initialize(VM.getVM().getTypeDataBase());
49 }
50 });
51 }
52
53 private static synchronized void initialize(TypeDataBase db) {
54 Type type = db.lookupType("CMSBitMap");
55 bmStartWordField = type.getAddressField("_bmStartWord");
56 bmWordSizeField = type.getCIntegerField("_bmWordSize");
57 shifterField = type.getCIntegerField("_shifter");
58 //bmField = type.getAddressField("_bm");
59 virtualSpaceFieldOffset = type.getField("_virtual_space").getOffset();
60 }
61 public void printAll() {
62 System.out.println("bmStartWord(): "+bmStartWord());
63 System.out.println("bmWordSize(): "+bmWordSize());
64 System.out.println("shifter(): "+shifter());
65 }
66
67 public Address bmStartWord() {
68 return bmStartWordField.getValue(addr);
69 }
70 public long bmWordSize() {
71 return bmWordSizeField.getValue(addr);
72 }
73 public long shifter() {
74 return shifterField.getValue(addr);
75 }
76 public VirtualSpace virtualSpace() {
77 return (VirtualSpace) VMObjectFactory.newObject(VirtualSpace.class, addr.addOffsetTo(virtualSpaceFieldOffset));
78 }
79
80 public BitMap bm() {
81 BitMap bitMap = new BitMap((int) (bmWordSize() >> (shifter() + 3) ));
82 VirtualSpace vs = virtualSpace();
83 //bitMap.set_size((int)vs.committedSize());
84 bitMap.set_map(vs.low());
85 return bitMap;
86 }
87
88 public Address getNextMarkedWordAddress(Address addr) {
89 Address endWord = bmStartWord().addOffsetTo(bmWordSize());
90 int nextOffset = bm().getNextOneOffset(heapWordToOffset(addr), heapWordToOffset(endWord) );
91 Address nextAddr = offsetToHeapWord(nextOffset);
92 return nextAddr;
93 }
94
95 int heapWordToOffset(Address addr) {
96 int temp = (int)addr.minus(bmStartWord()) / (int) VM.getVM().getAddressSize();
97 int ret_val = temp >> shifter();
98 return ret_val;
99 }
100
101 Address offsetToHeapWord(int offset) {
102 int temp = offset << shifter();
103 return bmStartWord().addOffsetTo(temp*VM.getVM().getAddressSize());
104 }
105
106 boolean isMarked(Address addr) {
107 BitMap bm = bm();
108 return bm.at(heapWordToOffset(addr));
109 }
110 }