1 /*

     2  * Copyright (c) 2017, 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 #ifndef SHARE_GC_G1_G1FULLGCPREPARETASK_HPP

    26 #define SHARE_GC_G1_G1FULLGCPREPARETASK_HPP

    27 

    28 #include "gc/g1/g1FullGCCompactionPoint.hpp"

    29 #include "gc/g1/g1FullGCScope.hpp"

    30 #include "gc/g1/g1FullGCTask.hpp"

    31 #include "gc/g1/g1RootProcessor.hpp"

    32 #include "gc/g1/g1StringDedup.hpp"

    33 #include "gc/g1/heapRegionManager.hpp"

    34 #include "gc/shared/referenceProcessor.hpp"

    35 #include "utilities/ticks.hpp"

    36 

    37 class G1CMBitMap;

    38 

    39 class G1FullGCPrepareTask : public G1FullGCTask {

    40 protected:

    41   volatile bool     _freed_regions;

    42   HeapRegionClaimer _hrclaimer;

    43 

    44   void set_freed_regions();

    45 

    46 public:

    47   G1FullGCPrepareTask(G1FullCollector* collector);

    48   void work(uint worker_id);

    49   void prepare_serial_compaction();

    50   bool has_freed_regions();

    51 

    52 protected:

    53   class G1CalculatePointersClosure : public HeapRegionClosure {

    54   protected:

    55     G1CollectedHeap* _g1h;

    56     G1CMBitMap* _bitmap;

    57     G1FullGCCompactionPoint* _cp;

    58     uint _humongous_regions_removed;

    59 

    60     virtual void prepare_for_compaction(HeapRegion* hr);

    61     void prepare_for_compaction_work(G1FullGCCompactionPoint* cp, HeapRegion* hr);

    62     void free_humongous_region(HeapRegion* hr);

    63     void reset_region_metadata(HeapRegion* hr);

    64 

    65   public:

    66     G1CalculatePointersClosure(G1CMBitMap* bitmap,

    67                                G1FullGCCompactionPoint* cp);

    68 

    69     void update_sets();

    70     bool doHeapRegion(HeapRegion* hr);

    71     bool freed_regions();

    72   };

    73 

    74   class G1PrepareCompactLiveClosure : public StackObj {

    75     G1FullGCCompactionPoint* _cp;

    76 

    77   public:

    78     G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);

    79     size_t apply(oop object);

    80   };

    81 

    82   class G1RePrepareClosure : public StackObj {

    83     G1FullGCCompactionPoint* _cp;

    84     HeapRegion* _current;

    85 

    86   public:

    87     G1RePrepareClosure(G1FullGCCompactionPoint* hrcp,

    88                        HeapRegion* hr) :

    89         _cp(hrcp),

    90         _current(hr) { }

    91 

    92     size_t apply(oop object);

    93   };

    94 };

    95 

    96 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP