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_GENREMSET_HPP
26 #define SHARE_VM_MEMORY_GENREMSET_HPP
27
28 #include "oops/oop.hpp"
29
30 // A GenRemSet provides ways of iterating over pointers across generations.
31 // (This is especially useful for older-to-younger.)
32
33 class Generation;
34 class BarrierSet;
35 class OopsInGenClosure;
36 class CardTableRS;
37
38 // Helper to remember modified oops in all klasses.
39 class KlassRemSet {
40 bool _accumulate_modified_oops;
41 public:
42 KlassRemSet() : _accumulate_modified_oops(false) {}
43 void set_accumulate_modified_oops(bool value) { _accumulate_modified_oops = value; }
44 bool accumulate_modified_oops() { return _accumulate_modified_oops; }
45 bool mod_union_is_clear();
46 void clear_mod_union();
114
115 // Informs the RS that there are no references to generations
116 // younger than gen from generations gen and older.
117 // The parameter clear_perm indicates if the perm_gen's
118 // remembered set should also be processed/cleared.
119 virtual void clear_into_younger(Generation* old_gen) = 0;
120
121 // Informs the RS that refs in the given "mr" may have changed
122 // arbitrarily, and therefore may contain old-to-young pointers.
123 // If "whole heap" is true, then this invalidation is part of an
124 // invalidation of the whole heap, which an implementation might
125 // handle differently than that of a sub-part of the heap.
126 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0;
127
128 // Informs the RS that refs in this generation
129 // may have changed arbitrarily, and therefore may contain
130 // old-to-young pointers in arbitrary locations.
131 virtual void invalidate_or_clear(Generation* old_gen) = 0;
132 };
133
134 #endif // SHARE_VM_MEMORY_GENREMSET_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_GENREMSET_HPP
26 #define SHARE_VM_GC_SHARED_GENREMSET_HPP
27
28 #include "oops/oop.hpp"
29
30 // A GenRemSet provides ways of iterating over pointers across generations.
31 // (This is especially useful for older-to-younger.)
32
33 class Generation;
34 class BarrierSet;
35 class OopsInGenClosure;
36 class CardTableRS;
37
38 // Helper to remember modified oops in all klasses.
39 class KlassRemSet {
40 bool _accumulate_modified_oops;
41 public:
42 KlassRemSet() : _accumulate_modified_oops(false) {}
43 void set_accumulate_modified_oops(bool value) { _accumulate_modified_oops = value; }
44 bool accumulate_modified_oops() { return _accumulate_modified_oops; }
45 bool mod_union_is_clear();
46 void clear_mod_union();
114
115 // Informs the RS that there are no references to generations
116 // younger than gen from generations gen and older.
117 // The parameter clear_perm indicates if the perm_gen's
118 // remembered set should also be processed/cleared.
119 virtual void clear_into_younger(Generation* old_gen) = 0;
120
121 // Informs the RS that refs in the given "mr" may have changed
122 // arbitrarily, and therefore may contain old-to-young pointers.
123 // If "whole heap" is true, then this invalidation is part of an
124 // invalidation of the whole heap, which an implementation might
125 // handle differently than that of a sub-part of the heap.
126 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0;
127
128 // Informs the RS that refs in this generation
129 // may have changed arbitrarily, and therefore may contain
130 // old-to-young pointers in arbitrary locations.
131 virtual void invalidate_or_clear(Generation* old_gen) = 0;
132 };
133
134 #endif // SHARE_VM_GC_SHARED_GENREMSET_HPP
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