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/*
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* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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//
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// A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
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// to a MutableSpace.
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//
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class ObjectStartArray;
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class PSMarkSweepDecorator: public CHeapObj {
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private:
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static PSMarkSweepDecorator* _destination_decorator;
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protected:
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MutableSpace* _space;
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ObjectStartArray* _start_array;
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HeapWord* _first_dead;
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HeapWord* _end_of_live;
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HeapWord* _compaction_top;
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size_t _allowed_dead_ratio;
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bool insert_deadspace(size_t& allowed_deadspace_words, HeapWord* q,
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size_t word_len);
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public:
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PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
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size_t allowed_dead_ratio) :
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_space(space), _start_array(start_array),
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_allowed_dead_ratio(allowed_dead_ratio) { }
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// During a compacting collection, we need to collapse objects into
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// spaces in a given order. We want to fill space A, space B, and so
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// on. The code that controls that order is in the following methods.
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static void set_destination_decorator_tenured();
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static void set_destination_decorator_perm_gen();
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static void advance_destination_decorator();
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static PSMarkSweepDecorator* destination_decorator();
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// Accessors
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MutableSpace* space() { return _space; }
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ObjectStartArray* start_array() { return _start_array; }
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HeapWord* compaction_top() { return _compaction_top; }
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void set_compaction_top(HeapWord* value) { _compaction_top = value; }
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size_t allowed_dead_ratio() { return _allowed_dead_ratio; }
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void set_allowed_dead_ratio(size_t value) { _allowed_dead_ratio = value; }
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// Work methods
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void adjust_pointers();
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void precompact();
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void compact(bool mangle_free_space);
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};
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