| /* |
| * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.memory; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| public class CMSBitMap extends VMObject { |
| private static AddressField bmStartWordField; |
| private static CIntegerField bmWordSizeField; |
| private static CIntegerField shifterField; |
| //private static AddressField bmField; |
| private static long virtualSpaceFieldOffset; |
| |
| public CMSBitMap(Address addr) { |
| super(addr); |
| } |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) { |
| Type type = db.lookupType("CMSBitMap"); |
| bmStartWordField = type.getAddressField("_bmStartWord"); |
| bmWordSizeField = type.getCIntegerField("_bmWordSize"); |
| shifterField = type.getCIntegerField("_shifter"); |
| //bmField = type.getAddressField("_bm"); |
| virtualSpaceFieldOffset = type.getField("_virtual_space").getOffset(); |
| } |
| public void printAll() { |
| System.out.println("bmStartWord(): "+bmStartWord()); |
| System.out.println("bmWordSize(): "+bmWordSize()); |
| System.out.println("shifter(): "+shifter()); |
| } |
| |
| public Address bmStartWord() { |
| return bmStartWordField.getValue(addr); |
| } |
| public long bmWordSize() { |
| return bmWordSizeField.getValue(addr); |
| } |
| public long shifter() { |
| return shifterField.getValue(addr); |
| } |
| public VirtualSpace virtualSpace() { |
| return (VirtualSpace) VMObjectFactory.newObject(VirtualSpace.class, addr.addOffsetTo(virtualSpaceFieldOffset)); |
| } |
| |
| public BitMap bm() { |
| BitMap bitMap = new BitMap((int) (bmWordSize() >> shifter() )); |
| VirtualSpace vs = virtualSpace(); |
| bitMap.set_map(vs.low()); |
| return bitMap; |
| } |
| |
| public Address getNextMarkedWordAddress(Address addr) { |
| Address endWord = bmStartWord().addOffsetTo(bmWordSize()); |
| int nextOffset = bm().getNextOneOffset(heapWordToOffset(addr), heapWordToOffset(endWord) ); |
| Address nextAddr = offsetToHeapWord(nextOffset); |
| return nextAddr; |
| } |
| |
| int heapWordToOffset(Address addr) { |
| int temp = (int)addr.minus(bmStartWord()) / (int) VM.getVM().getAddressSize(); |
| int ret_val = temp >> shifter(); |
| return ret_val; |
| } |
| |
| Address offsetToHeapWord(int offset) { |
| int temp = offset << shifter(); |
| return bmStartWord().addOffsetTo(temp*VM.getVM().getAddressSize()); |
| } |
| |
| boolean isMarked(Address addr) { |
| BitMap bm = bm(); |
| return bm.at(heapWordToOffset(addr)); |
| } |
| } |