1 /*
   2  * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.gc.cms;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.gc.shared.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 import sun.jvm.hotspot.types.*;
  33 
  34 public class ConcurrentMarkSweepGeneration extends CardGeneration {
  35   private static AddressField cmsSpaceField;
  36 
  37   public ConcurrentMarkSweepGeneration(Address addr) {
  38     super(addr);
  39   }
  40 
  41   static {
  42     VM.registerVMInitializedObserver(new Observer() {
  43         public void update(Observable o, Object data) {
  44           initialize(VM.getVM().getTypeDataBase());
  45         }
  46       });
  47   }
  48 
  49   private static synchronized void initialize(TypeDataBase db) {
  50     Type type = db.lookupType("ConcurrentMarkSweepGeneration");
  51     cmsSpaceField = type.getAddressField("_cmsSpace");
  52   }
  53 
  54   // Accessing space
  55   public CompactibleFreeListSpace cmsSpace() {
  56     return (CompactibleFreeListSpace) VMObjectFactory.newObject(
  57                                  CompactibleFreeListSpace.class,
  58                                  cmsSpaceField.getValue(addr));
  59   }
  60 
  61   public long capacity()                { return cmsSpace().capacity(); }
  62   public long used()                    { return cmsSpace().used(); }
  63   public long free()                    { return cmsSpace().free(); }
  64   public long contiguousAvailable()     { throw new RuntimeException("not yet implemented"); }
  65   public boolean contains(Address p)    { return cmsSpace().contains(p); }
  66   public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
  67      blk.doSpace(cmsSpace());
  68   }
  69   public void liveRegionsIterate(LiveRegionsClosure closure) {
  70       closure.doLiveRegions(cmsSpace());
  71   }
  72 
  73   public Generation.Name kind() {
  74     return Generation.Name.CONCURRENT_MARK_SWEEP;
  75   }
  76 
  77   public String name() {
  78     return "concurrent mark-sweep generation";
  79   }
  80 
  81   public void printOn(PrintStream tty) {
  82     tty.println(name());
  83     cmsSpace().printOn(tty);
  84   }
  85 }