hotspot/agent/src/share/classes/sun/jvm/hotspot/memory/FreeList.java

/*
 * @(#)FreeList.java
 *
 * Copyright (c) 2000, 2013, 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.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.runtime.*;

public class FreeList 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("FreeList<FreeChunk>");
      sizeField = type.getCIntegerField("_size");
      countField = type.getCIntegerField("_count");
      headerSize = type.getSize();
   }

   // Fields
   private static CIntegerField sizeField;
   private static CIntegerField countField;
   private static long          headerSize;

   //Constructor
   public FreeList(Address address) {
     super(address);
   }

   // Accessors
   public long size() {
      return sizeField.getValue(addr);
   }

   public long count() {
      return  countField.getValue(addr);
   }

   public static long sizeOf() {
     return headerSize;
  }
}