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comparison: src/share/vm/memory/cardTableRS.hpp
src/share/vm/memory/cardTableRS.hpp
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| 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; | |
| 50 } | |
| 51 | |
| 52 static bool | |
| 53 card_is_dirty_wrt_gen_iter(jbyte cv) { | |
| 54 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv); | |
| 55 } | |
| 56 | |
| 57 CardTableModRefBSForCTRS* _ct_bs; | |
| 58 | |
| 59 virtual void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl); | |
| 60 | |
| 61 void verify_space(Space* s, HeapWord* gen_start); | |
| 62 | |
| 63 enum ExtendedCardValue { | |
| 64 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
| 65 // These are for parallel collection. | |
| 66 // There are three P (parallel) youngergen card values. In general, this | |
| 67 // needs to be more than the number of generations (including the perm | |
| 68 // gen) that might have younger_refs_do invoked on them separately. So | |
| 69 // if we add more gens, we have to add more values. | |
| 70 youngergenP1_card = CardTableModRefBS::CT_MR_BS_last_reserved + 2, | |
| 71 youngergenP2_card = CardTableModRefBS::CT_MR_BS_last_reserved + 3, | |
| 72 youngergenP3_card = CardTableModRefBS::CT_MR_BS_last_reserved + 4, | |
| 73 cur_youngergen_and_prev_nonclean_card = | |
| 74 CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
| 75 }; | |
| 76 | |
| 77 // An array that contains, for each generation, the card table value last | |
| 78 // used as the current value for a younger_refs_do iteration of that | |
| 79 // portion of the table. (The perm gen is index 0; other gens are at | |
| 80 // their level plus 1. They youngest gen is in the table, but will | |
| 81 // always have the value "clean_card".) | |
| 82 jbyte* _last_cur_val_in_gen; | |
| 83 | |
| 84 jbyte _cur_youngergen_card_val; | |
| 85 | |
| 86 int _regions_to_iterate; | |
| 87 | |
| 88 jbyte cur_youngergen_card_val() { | |
| 89 return _cur_youngergen_card_val; | |
| 90 } | |
| 91 void set_cur_youngergen_card_val(jbyte v) { | |
| 92 _cur_youngergen_card_val = v; | |
| 93 } | |
| 94 bool is_prev_youngergen_card_val(jbyte v) { | |
| 95 return | |
| 96 youngergen_card <= v && | |
| 97 v < cur_youngergen_and_prev_nonclean_card && | |
| 98 v != _cur_youngergen_card_val; | |
| 99 } | |
| 100 // Return a youngergen_card_value that is not currently in use. | |
| 101 jbyte find_unused_youngergenP_card_value(); | |
| 102 | |
| 103 public: | |
| 104 CardTableRS(MemRegion whole_heap, int max_covered_regions); | |
| 105 ~CardTableRS(); | |
| 106 | |
| 107 // *** GenRemSet functions. | |
| 108 GenRemSet::Name rs_kind() { return GenRemSet::CardTable; } | |
| 109 | |
| 110 CardTableRS* as_CardTableRS() { return this; } | |
| 111 | |
| 112 CardTableModRefBS* ct_bs() { return _ct_bs; } | |
| 113 | |
| 114 // Override. | |
| 115 void prepare_for_younger_refs_iterate(bool parallel); | |
| 116 | |
| 117 // Card table entries are cleared before application; "blk" is | |
| 118 // responsible for dirtying if the oop is still older-to-younger after | |
| 119 // closure application. | |
| 120 void younger_refs_iterate(Generation* g, OopsInGenClosure* blk); | |
| 121 | |
| 122 void inline_write_ref_field_gc(void* field, oop new_val) { | |
| 123 jbyte* byte = _ct_bs->byte_for(field); | |
| 124 *byte = youngergen_card; | |
| 125 } | |
| 126 void write_ref_field_gc_work(void* field, oop new_val) { | |
| 127 inline_write_ref_field_gc(field, new_val); | |
| 128 } | |
| 129 | |
| 130 // Override. Might want to devirtualize this in the same fashion as | |
| 131 // above. Ensures that the value of the card for field says that it's | |
| 132 // a younger card in the current collection. | |
| 133 virtual void write_ref_field_gc_par(void* field, oop new_val); | |
| 134 | |
| 135 void resize_covered_region(MemRegion new_region); | |
| 136 | |
| 137 bool is_aligned(HeapWord* addr) { | |
| 138 return _ct_bs->is_card_aligned(addr); | |
| 139 } | |
| 140 | |
| 141 void verify(); | |
| 142 void verify_aligned_region_empty(MemRegion mr); | |
| 143 | |
| 144 void clear(MemRegion mr) { _ct_bs->clear(mr); } | |
| 145 void clear_into_younger(Generation* old_gen); | |
| 146 | |
| 147 void invalidate(MemRegion mr, bool whole_heap = false) { | |
| 148 _ct_bs->invalidate(mr, whole_heap); | |
| 149 } | |
| 150 void invalidate_or_clear(Generation* old_gen); | |
| 151 | |
| 152 static uintx ct_max_alignment_constraint() { | |
| 153 return CardTableModRefBS::ct_max_alignment_constraint(); | |
| 154 } | |
| 155 | |
| 156 jbyte* byte_for(void* p) { return _ct_bs->byte_for(p); } | |
| 157 jbyte* byte_after(void* p) { return _ct_bs->byte_after(p); } | |
| 158 HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); } | |
| 159 | |
| 160 bool is_prev_nonclean_card_val(jbyte v) { | |
| 161 return | |
| 162 youngergen_card <= v && | |
| 163 v <= cur_youngergen_and_prev_nonclean_card && | |
| 164 v != _cur_youngergen_card_val; | |
| 165 } | |
| 166 | |
| 167 static bool youngergen_may_have_been_dirty(jbyte cv) { | |
| 168 return cv == CardTableRS::cur_youngergen_and_prev_nonclean_card; | |
| 169 } | |
| 170 | |
| 171 }; | |
| 172 | |
| 173 class ClearNoncleanCardWrapper: public MemRegionClosure { | |
| 174 DirtyCardToOopClosure* _dirty_card_closure; | |
| 175 CardTableRS* _ct; | |
| 176 bool _is_par; | |
| 177 private: | |
| 178 // Clears the given card, return true if the corresponding card should be | |
| 179 // processed. | |
| 180 inline bool clear_card(jbyte* entry); | |
| 181 // Work methods called by the clear_card() | |
| 182 inline bool clear_card_serial(jbyte* entry); | |
| 183 inline bool clear_card_parallel(jbyte* entry); | |
| 184 // check alignment of pointer | |
| 185 bool is_word_aligned(jbyte* entry); | |
| 186 | |
| 187 public: | |
| 188 ClearNoncleanCardWrapper(DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct); | |
| 189 void do_MemRegion(MemRegion mr); | |
| 190 }; | |
| 191 | |
| 192 #endif // SHARE_VM_MEMORY_CARDTABLERS_HPP |
