jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp@850fdf70db2b

     1 /*

     2  * Copyright 2001-2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 //

    26 // A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations

    27 // to a MutableSpace.

    28 //

    30 class ObjectStartArray;

    32 class PSMarkSweepDecorator: public CHeapObj {

    33  private:

    34   static PSMarkSweepDecorator* _destination_decorator;

    36  protected:

    37   MutableSpace* _space;

    38   ObjectStartArray* _start_array;

    39   HeapWord* _first_dead;

    40   HeapWord* _end_of_live;

    41   HeapWord* _compaction_top;

    42   unsigned int _allowed_dead_ratio;

    44   bool insert_deadspace(ssize_t& allowed_deadspace_words, HeapWord* q, size_t word_len);

    46  public:

    47   PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,

    48                        unsigned int allowed_dead_ratio) :

    49     _space(space), _start_array(start_array), _allowed_dead_ratio(allowed_dead_ratio) { }

    51   // During a compacting collection, we need to collapse objects into

    52   // spaces in a given order. We want to fill space A, space B, and so

    53   // on. The code that controls that order is in the following methods.

    54   static void set_destination_decorator_tenured();

    55   static void set_destination_decorator_perm_gen();

    56   static void advance_destination_decorator();

    57   static PSMarkSweepDecorator* destination_decorator();

    59   // Accessors

    60   MutableSpace* space()                           { return _space; }

    61   ObjectStartArray* start_array()                 { return _start_array; }

    63   HeapWord* compaction_top()                      { return _compaction_top; }

    64   void set_compaction_top(HeapWord* value)        { _compaction_top = value; }

    66   unsigned int allowed_dead_ratio()               { return _allowed_dead_ratio; }

    67   void set_allowed_dead_ratio(unsigned int value) { _allowed_dead_ratio = value; }

    69   // Work methods

    70   void adjust_pointers();

    71   void precompact();

    72   void compact(bool mangle_free_space);

    73 };

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