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 }