JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, 2015, 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.gc.parallel;

import java.io.*;
import java.util.*;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;

public class PSYoungGen 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("PSYoungGen");
      edenSpaceField = type.getAddressField("_eden_space");
      fromSpaceField = type.getAddressField("_from_space");
      toSpaceField = type.getAddressField("_to_space");
   }

   public PSYoungGen(Address addr) {
      super(addr);
   }

   // Fields
   private static AddressField edenSpaceField;
   private static AddressField fromSpaceField;
   private static AddressField toSpaceField;

   // Accessors
   public MutableSpace edenSpace() {
      return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, edenSpaceField.getValue(addr));
   }

   public MutableSpace fromSpace() {
      return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, fromSpaceField.getValue(addr));
   }

   public MutableSpace toSpace() {
      return (MutableSpace) VMObjectFactory.newObject(MutableSpace.class, toSpaceField.getValue(addr));
   }

   public long capacity() {
      return edenSpace().capacity() + fromSpace().capacity();
   }

   public long used() {
      return edenSpace().used() + fromSpace().used();
   }

   public boolean isIn(Address a) {
      if (edenSpace().contains(a)) {
         return true;
      }

      if (fromSpace().contains(a)) {
         return true;
      }

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