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src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp@850fdf70db2b (annotated)

src/share/vm/gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp

Mon, 28 Jul 2008 15:30:23 -0700

author

jmasa

date

Mon, 28 Jul 2008 15:30:23 -0700

changeset 704

850fdf70db2b

parent 435

a61af66fc99e

child 873

122d10c82f3f

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	//
duke@435	26	// A PSMarkSweepDecorator is used to add "ParallelScavenge" style mark sweep operations
duke@435	27	// to a MutableSpace.
duke@435	28	//
duke@435	29
duke@435	30	class ObjectStartArray;
duke@435	31
duke@435	32	class PSMarkSweepDecorator: public CHeapObj {
duke@435	33	private:
duke@435	34	static PSMarkSweepDecorator* _destination_decorator;
duke@435	35
duke@435	36	protected:
duke@435	37	MutableSpace* _space;
duke@435	38	ObjectStartArray* _start_array;
duke@435	39	HeapWord* _first_dead;
duke@435	40	HeapWord* _end_of_live;
duke@435	41	HeapWord* _compaction_top;
duke@435	42	unsigned int _allowed_dead_ratio;
duke@435	43
duke@435	44	bool insert_deadspace(ssize_t& allowed_deadspace_words, HeapWord* q, size_t word_len);
duke@435	45
duke@435	46	public:
duke@435	47	PSMarkSweepDecorator(MutableSpace* space, ObjectStartArray* start_array,
duke@435	48	unsigned int allowed_dead_ratio) :
duke@435	49	_space(space), _start_array(start_array), _allowed_dead_ratio(allowed_dead_ratio) { }
duke@435	50
duke@435	51	// During a compacting collection, we need to collapse objects into
duke@435	52	// spaces in a given order. We want to fill space A, space B, and so
duke@435	53	// on. The code that controls that order is in the following methods.
duke@435	54	static void set_destination_decorator_tenured();
duke@435	55	static void set_destination_decorator_perm_gen();
duke@435	56	static void advance_destination_decorator();
duke@435	57	static PSMarkSweepDecorator* destination_decorator();
duke@435	58
duke@435	59	// Accessors
duke@435	60	MutableSpace* space() { return _space; }
duke@435	61	ObjectStartArray* start_array() { return _start_array; }
duke@435	62
duke@435	63	HeapWord* compaction_top() { return _compaction_top; }
duke@435	64	void set_compaction_top(HeapWord* value) { _compaction_top = value; }
duke@435	65
duke@435	66	unsigned int allowed_dead_ratio() { return _allowed_dead_ratio; }
duke@435	67	void set_allowed_dead_ratio(unsigned int value) { _allowed_dead_ratio = value; }
duke@435	68
duke@435	69	// Work methods
duke@435	70	void adjust_pointers();
duke@435	71	void precompact();
duke@435	72	void compact(bool mangle_free_space);
duke@435	73	};