RFE_8195103_reduce_initial_card_marks
0 /*
1 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
|
0 /*
1 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
|
24 #ifndef SHARE_VM_GC_SHARED_CARDTABLEMODREFBSFORCTRS_HPP
25 #define SHARE_VM_GC_SHARED_CARDTABLEMODREFBSFORCTRS_HPP
26
27 #include "gc/shared/cardTableModRefBS.hpp"
28
29 class CardTableRS;
30 class DirtyCardToOopClosure;
31 class OopsInGenClosure;
32
33 // A specialization for the CardTableRS gen rem set.
34 class CardTableModRefBSForCTRS: public CardTableModRefBS {
35 friend class CardTableRS;
36
37 public:
38 CardTableModRefBSForCTRS(MemRegion whole_heap);
39 ~CardTableModRefBSForCTRS();
40
41 virtual void initialize();
42
43 void set_CTRS(CardTableRS* rs) { _rs = rs; }
44
45 private:
46 CardTableRS* _rs;
47
48 // *** Support for parallel card scanning.
49
50 // dirty and precleaned are equivalent wrt younger_refs_iter.
51 static bool card_is_dirty_wrt_gen_iter(jbyte cv) {
52 return cv == dirty_card || cv == precleaned_card;
53 }
54
55 // Returns "true" iff the value "cv" will cause the card containing it
56 // to be scanned in the current traversal. May be overridden by
57 // subtypes.
58 bool card_will_be_scanned(jbyte cv);
59
60 // Returns "true" iff the value "cv" may have represented a dirty card at
61 // some point.
62 bool card_may_have_been_dirty(jbyte cv);
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24 #ifndef SHARE_VM_GC_SHARED_CARDTABLEMODREFBSFORCTRS_HPP
25 #define SHARE_VM_GC_SHARED_CARDTABLEMODREFBSFORCTRS_HPP
26
27 #include "gc/shared/cardTableModRefBS.hpp"
28
29 class CardTableRS;
30 class DirtyCardToOopClosure;
31 class OopsInGenClosure;
32
33 // A specialization for the CardTableRS gen rem set.
34 class CardTableModRefBSForCTRS: public CardTableModRefBS {
35 friend class CardTableRS;
36
37 public:
38 CardTableModRefBSForCTRS(MemRegion whole_heap);
39 ~CardTableModRefBSForCTRS();
40
41 virtual void initialize();
42
43 void set_CTRS(CardTableRS* rs) { _rs = rs; }
44
45 virtual bool card_mark_must_follow_store() const {
46 return UseConcMarkSweepGC;
47 }
48
49 virtual bool is_in_young(oop obj) const;
50
51 private:
52 CardTableRS* _rs;
53
54 // *** Support for parallel card scanning.
55
56 // dirty and precleaned are equivalent wrt younger_refs_iter.
57 static bool card_is_dirty_wrt_gen_iter(jbyte cv) {
58 return cv == dirty_card || cv == precleaned_card;
59 }
60
61 // Returns "true" iff the value "cv" will cause the card containing it
62 // to be scanned in the current traversal. May be overridden by
63 // subtypes.
64 bool card_will_be_scanned(jbyte cv);
65
66 // Returns "true" iff the value "cv" may have represented a dirty card at
67 // some point.
68 bool card_may_have_been_dirty(jbyte cv);
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