1 /*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_CARDTABLERS_HPP
26 #define SHARE_VM_MEMORY_CARDTABLERS_HPP
27
28 #include "memory/cardTableModRefBS.hpp"
29 #include "memory/genRemSet.hpp"
30 #include "memory/memRegion.hpp"
31
32 class Space;
33 class OopsInGenClosure;
34
35 // This kind of "GenRemSet" uses a card table both as shared data structure
36 // for a mod ref barrier set and for the rem set information.
37
38 class CardTableRS: public GenRemSet {
39 friend class VMStructs;
40 // Below are private classes used in impl.
41 friend class VerifyCTSpaceClosure;
42 friend class ClearNoncleanCardWrapper;
43
44 static jbyte clean_card_val() {
45 return CardTableModRefBS::clean_card;
46 }
47
48 static intptr_t clean_card_row() {
49 return CardTableModRefBS::clean_card_row;
170
171 class ClearNoncleanCardWrapper: public MemRegionClosure {
172 DirtyCardToOopClosure* _dirty_card_closure;
173 CardTableRS* _ct;
174 bool _is_par;
175 private:
176 // Clears the given card, return true if the corresponding card should be
177 // processed.
178 inline bool clear_card(jbyte* entry);
179 // Work methods called by the clear_card()
180 inline bool clear_card_serial(jbyte* entry);
181 inline bool clear_card_parallel(jbyte* entry);
182 // check alignment of pointer
183 bool is_word_aligned(jbyte* entry);
184
185 public:
186 ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct);
187 void do_MemRegion(MemRegion mr);
188 };
189
190 #endif // SHARE_VM_MEMORY_CARDTABLERS_HPP
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1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_SHARED_CARDTABLERS_HPP
26 #define SHARE_VM_GC_SHARED_CARDTABLERS_HPP
27
28 #include "gc/shared/cardTableModRefBS.hpp"
29 #include "gc/shared/genRemSet.hpp"
30 #include "memory/memRegion.hpp"
31
32 class Space;
33 class OopsInGenClosure;
34
35 // This kind of "GenRemSet" uses a card table both as shared data structure
36 // for a mod ref barrier set and for the rem set information.
37
38 class CardTableRS: public GenRemSet {
39 friend class VMStructs;
40 // Below are private classes used in impl.
41 friend class VerifyCTSpaceClosure;
42 friend class ClearNoncleanCardWrapper;
43
44 static jbyte clean_card_val() {
45 return CardTableModRefBS::clean_card;
46 }
47
48 static intptr_t clean_card_row() {
49 return CardTableModRefBS::clean_card_row;
170
171 class ClearNoncleanCardWrapper: public MemRegionClosure {
172 DirtyCardToOopClosure* _dirty_card_closure;
173 CardTableRS* _ct;
174 bool _is_par;
175 private:
176 // Clears the given card, return true if the corresponding card should be
177 // processed.
178 inline bool clear_card(jbyte* entry);
179 // Work methods called by the clear_card()
180 inline bool clear_card_serial(jbyte* entry);
181 inline bool clear_card_parallel(jbyte* entry);
182 // check alignment of pointer
183 bool is_word_aligned(jbyte* entry);
184
185 public:
186 ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct);
187 void do_MemRegion(MemRegion mr);
188 };
189
190 #endif // SHARE_VM_GC_SHARED_CARDTABLERS_HPP
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