| /* |
| * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.memory; |
| |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.runtime.*; |
| |
| public class FreeChunk extends VMObject { |
| 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("FreeChunk"); |
| nextField = type.getAddressField("_next"); |
| prevField = type.getAddressField("_prev"); |
| sizeField = type.getCIntegerField("_size"); |
| } |
| |
| // Fields |
| private static AddressField nextField; |
| private static AddressField prevField; |
| private static CIntegerField sizeField; |
| |
| // Accessors |
| public FreeChunk next() { |
| return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, nextField.getValue(addr)); |
| } |
| |
| public FreeChunk prev() { |
| Address prev = prevField.getValue(addr).andWithMask(~0x3); |
| return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, prev); |
| } |
| |
| public long size() { |
| return sizeField.getValue(addr); |
| } |
| |
| public FreeChunk(Address addr) { |
| super(addr); |
| } |
| |
| public static boolean secondWordIndicatesFreeChunk(long word) { |
| return (word & 0x1L) == 0x1L; |
| } |
| |
| public boolean isFree() { |
| Debugger dbg = VM.getVM().getDebugger(); |
| Address prev = prevField.getValue(addr); |
| return secondWordIndicatesFreeChunk(dbg.getAddressValue(prev)); |
| } |
| } |