JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, 2019, 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.
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 */

package sun.jvm.hotspot.gc.parallel;

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

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.gc.shared.*;
import sun.jvm.hotspot.memory.MemRegion;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;

public class ParallelScavengeHeap extends CollectedHeap {
   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("ParallelScavengeHeap");
      youngGenField = type.getAddressField("_young_gen");
      oldGenField    = type.getAddressField("_old_gen");
   }

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

   // Fields
   private static AddressField youngGenField;
   private static AddressField oldGenField;

   // Accessors
   public PSYoungGen youngGen() {
      return (PSYoungGen) VMObjectFactory.newObject(PSYoungGen.class, youngGenField.getValue());
   }

   public PSOldGen oldGen() {
      return (PSOldGen) VMObjectFactory.newObject(PSOldGen.class, oldGenField.getValue());
   }

   public long capacity() {
      return youngGen().capacity() + oldGen().capacity();
   }

   public long used() {
      return youngGen().used() + oldGen().used();
   }

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

      if (oldGen().isIn(a)) {
         return true;
      }

      return false;
   }

   public CollectedHeapName kind() {
      return CollectedHeapName.PARALLEL;
   }

   // Simple wrapper to provide toString() usable for debugging.
   private class LiveRegionProviderImpl implements LiveRegionsProvider {
      private String name;
      private MutableSpace space;

      public LiveRegionProviderImpl(String name, MutableSpace space) {
         this.name = name;
         this.space = space;
      }

      @Override
      public List<MemRegion> getLiveRegions() {
         return space.getLiveRegions();
      }
      @Override
      public String toString() {
         return name;
      }
   }

   public void liveRegionsIterate(LiveRegionsClosure closure) {
      // Add eden space
      closure.doLiveRegions(new LiveRegionProviderImpl("eden", youngGen().edenSpace()));

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