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src/share/vm/memory/cardTableRS.hpp@09d00c18e323 (annotated)

src/share/vm/memory/cardTableRS.hpp

Wed, 15 Feb 2012 10:12:55 -0800

author

never

date

Wed, 15 Feb 2012 10:12:55 -0800

changeset 3571

09d00c18e323

parent 2889

fc2b798ab316

child 3642

c7a555a9449a

permissions

-rw-r--r--

7145537: minor tweaks to LogEvents
Reviewed-by: kvn, twisti

duke@435	1	/*
ysr@2819	2	* Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_MEMORY_CARDTABLERS_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_CARDTABLERS_HPP
stefank@2314	27
stefank@2314	28	#include "memory/cardTableModRefBS.hpp"
stefank@2314	29	#include "memory/genRemSet.hpp"
stefank@2314	30	#include "memory/memRegion.hpp"
stefank@2314	31
duke@435	32	class Space;
duke@435	33	class OopsInGenClosure;
duke@435	34
duke@435	35	// This kind of "GenRemSet" uses a card table both as shared data structure
duke@435	36	// for a mod ref barrier set and for the rem set information.
duke@435	37
duke@435	38	class CardTableRS: public GenRemSet {
duke@435	39	friend class VMStructs;
duke@435	40	// Below are private classes used in impl.
duke@435	41	friend class VerifyCTSpaceClosure;
duke@435	42	friend class ClearNoncleanCardWrapper;
duke@435	43
duke@435	44	static jbyte clean_card_val() {
duke@435	45	return CardTableModRefBS::clean_card;
duke@435	46	}
duke@435	47
duke@435	48	static bool
duke@435	49	card_is_dirty_wrt_gen_iter(jbyte cv) {
duke@435	50	return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv);
duke@435	51	}
duke@435	52
ysr@777	53	CardTableModRefBSForCTRS* _ct_bs;
duke@435	54
duke@435	55	virtual void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl);
duke@435	56
duke@435	57	void verify_space(Space* s, HeapWord* gen_start);
duke@435	58
duke@435	59	enum ExtendedCardValue {
duke@435	60	youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
duke@435	61	// These are for parallel collection.
duke@435	62	// There are three P (parallel) youngergen card values. In general, this
duke@435	63	// needs to be more than the number of generations (including the perm
duke@435	64	// gen) that might have younger_refs_do invoked on them separately. So
duke@435	65	// if we add more gens, we have to add more values.
duke@435	66	youngergenP1_card = CardTableModRefBS::CT_MR_BS_last_reserved + 2,
duke@435	67	youngergenP2_card = CardTableModRefBS::CT_MR_BS_last_reserved + 3,
duke@435	68	youngergenP3_card = CardTableModRefBS::CT_MR_BS_last_reserved + 4,
duke@435	69	cur_youngergen_and_prev_nonclean_card =
duke@435	70	CardTableModRefBS::CT_MR_BS_last_reserved + 5
duke@435	71	};
duke@435	72
duke@435	73	// An array that contains, for each generation, the card table value last
duke@435	74	// used as the current value for a younger_refs_do iteration of that
duke@435	75	// portion of the table. (The perm gen is index 0; other gens are at
duke@435	76	// their level plus 1. They youngest gen is in the table, but will
duke@435	77	// always have the value "clean_card".)
duke@435	78	jbyte* _last_cur_val_in_gen;
duke@435	79
duke@435	80	jbyte _cur_youngergen_card_val;
duke@435	81
ysr@777	82	int _regions_to_iterate;
ysr@777	83
duke@435	84	jbyte cur_youngergen_card_val() {
duke@435	85	return _cur_youngergen_card_val;
duke@435	86	}
duke@435	87	void set_cur_youngergen_card_val(jbyte v) {
duke@435	88	_cur_youngergen_card_val = v;
duke@435	89	}
duke@435	90	bool is_prev_youngergen_card_val(jbyte v) {
duke@435	91	return
duke@435	92	youngergen_card <= v &&
duke@435	93	v < cur_youngergen_and_prev_nonclean_card &&
duke@435	94	v != _cur_youngergen_card_val;
duke@435	95	}
duke@435	96	// Return a youngergen_card_value that is not currently in use.
duke@435	97	jbyte find_unused_youngergenP_card_value();
duke@435	98
duke@435	99	public:
duke@435	100	CardTableRS(MemRegion whole_heap, int max_covered_regions);
duke@435	101
duke@435	102	// *** GenRemSet functions.
duke@435	103	GenRemSet::Name rs_kind() { return GenRemSet::CardTable; }
duke@435	104
duke@435	105	CardTableRS* as_CardTableRS() { return this; }
duke@435	106
ysr@777	107	CardTableModRefBS* ct_bs() { return _ct_bs; }
duke@435	108
duke@435	109	// Override.
duke@435	110	void prepare_for_younger_refs_iterate(bool parallel);
duke@435	111
duke@435	112	// Card table entries are cleared before application; "blk" is
duke@435	113	// responsible for dirtying if the oop is still older-to-younger after
duke@435	114	// closure application.
duke@435	115	void younger_refs_iterate(Generation* g, OopsInGenClosure* blk);
duke@435	116
coleenp@548	117	void inline_write_ref_field_gc(void* field, oop new_val) {
ysr@777	118	jbyte* byte = _ct_bs->byte_for(field);
duke@435	119	*byte = youngergen_card;
duke@435	120	}
coleenp@548	121	void write_ref_field_gc_work(void* field, oop new_val) {
duke@435	122	inline_write_ref_field_gc(field, new_val);
duke@435	123	}
duke@435	124
duke@435	125	// Override. Might want to devirtualize this in the same fashion as
duke@435	126	// above. Ensures that the value of the card for field says that it's
duke@435	127	// a younger card in the current collection.
coleenp@548	128	virtual void write_ref_field_gc_par(void* field, oop new_val);
duke@435	129
duke@435	130	void resize_covered_region(MemRegion new_region);
duke@435	131
duke@435	132	bool is_aligned(HeapWord* addr) {
ysr@777	133	return _ct_bs->is_card_aligned(addr);
duke@435	134	}
duke@435	135
duke@435	136	void verify();
jmasa@441	137	void verify_aligned_region_empty(MemRegion mr);
duke@435	138
ysr@777	139	void clear(MemRegion mr) { _ct_bs->clear(mr); }
duke@435	140	void clear_into_younger(Generation* gen, bool clear_perm);
duke@435	141
ysr@777	142	void invalidate(MemRegion mr, bool whole_heap = false) {
ysr@777	143	_ct_bs->invalidate(mr, whole_heap);
ysr@777	144	}
duke@435	145	void invalidate_or_clear(Generation* gen, bool younger, bool perm);
duke@435	146
duke@435	147	static uintx ct_max_alignment_constraint() {
duke@435	148	return CardTableModRefBS::ct_max_alignment_constraint();
duke@435	149	}
duke@435	150
ysr@777	151	jbyte* byte_for(void* p) { return _ct_bs->byte_for(p); }
ysr@777	152	jbyte* byte_after(void* p) { return _ct_bs->byte_after(p); }
ysr@777	153	HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); }
duke@435	154
duke@435	155	bool is_prev_nonclean_card_val(jbyte v) {
duke@435	156	return
duke@435	157	youngergen_card <= v &&
duke@435	158	v <= cur_youngergen_and_prev_nonclean_card &&
duke@435	159	v != _cur_youngergen_card_val;
duke@435	160	}
duke@435	161
duke@435	162	static bool youngergen_may_have_been_dirty(jbyte cv) {
duke@435	163	return cv == CardTableRS::cur_youngergen_and_prev_nonclean_card;
duke@435	164	}
duke@435	165
duke@435	166	};
stefank@2314	167
ysr@2819	168	class ClearNoncleanCardWrapper: public MemRegionClosure {
ysr@2889	169	DirtyCardToOopClosure* _dirty_card_closure;
ysr@2819	170	CardTableRS* _ct;
ysr@2819	171	bool _is_par;
ysr@2819	172	private:
ysr@2819	173	// Clears the given card, return true if the corresponding card should be
ysr@2819	174	// processed.
ysr@2819	175	inline bool clear_card(jbyte* entry);
ysr@2819	176	// Work methods called by the clear_card()
ysr@2819	177	inline bool clear_card_serial(jbyte* entry);
ysr@2819	178	inline bool clear_card_parallel(jbyte* entry);
ysr@2819	179
ysr@2819	180	public:
ysr@2889	181	ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct);
ysr@2819	182	void do_MemRegion(MemRegion mr);
ysr@2819	183	};
ysr@2819	184
stefank@2314	185	#endif // SHARE_VM_MEMORY_CARDTABLERS_HPP