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comparison: src/share/vm/memory/cardTableModRefBS.hpp

src/share/vm/memory/cardTableModRefBS.hpp

changeset 7051
1f1d373cd044
parent 6680
78bbf4d43a14
child 7535
7ae4e26cb1e0
child 8659
c70ebf41026a
equal deleted inserted replaced
7050:6701abbc4441 7051:1f1d373cd044
94 } 94 }
95 95
96 // The declaration order of these const fields is important; see the 96 // The declaration order of these const fields is important; see the
97 // constructor before changing. 97 // constructor before changing.
98 const MemRegion _whole_heap; // the region covered by the card table 98 const MemRegion _whole_heap; // the region covered by the card table
99 const size_t _guard_index; // index of very last element in the card 99 size_t _guard_index; // index of very last element in the card
100 // table; it is set to a guard value 100 // table; it is set to a guard value
101 // (last_card) and should never be modified 101 // (last_card) and should never be modified
102 const size_t _last_valid_index; // index of the last valid element 102 size_t _last_valid_index; // index of the last valid element
103 const size_t _page_size; // page size used when mapping _byte_map 103 const size_t _page_size; // page size used when mapping _byte_map
104 const size_t _byte_map_size; // in bytes 104 size_t _byte_map_size; // in bytes
105 jbyte* _byte_map; // the card marking array 105 jbyte* _byte_map; // the card marking array
106 106
107 int _cur_covered_regions; 107 int _cur_covered_regions;
108 // The covered regions should be in address order. 108 // The covered regions should be in address order.
109 MemRegion* _covered; 109 MemRegion* _covered;
121 MemRegion _guard_region; 121 MemRegion _guard_region;
122 122
123 protected: 123 protected:
124 // Initialization utilities; covered_words is the size of the covered region 124 // Initialization utilities; covered_words is the size of the covered region
125 // in, um, words. 125 // in, um, words.
126 inline size_t cards_required(size_t covered_words); 126 inline size_t cards_required(size_t covered_words) {
127 // Add one for a guard card, used to detect errors.
128 const size_t words = align_size_up(covered_words, card_size_in_words);
129 return words / card_size_in_words + 1;
130 }
131
127 inline size_t compute_byte_map_size(); 132 inline size_t compute_byte_map_size();
128 133
129 // Finds and return the index of the region, if any, to which the given 134 // Finds and return the index of the region, if any, to which the given
130 // region would be contiguous. If none exists, assign a new region and 135 // region would be contiguous. If none exists, assign a new region and
131 // returns its index. Requires that no more than the maximum number of 136 // returns its index. Requires that no more than the maximum number of
135 // Same as above, but finds the region containing the given address 140 // Same as above, but finds the region containing the given address
136 // instead of starting at a given base address. 141 // instead of starting at a given base address.
137 int find_covering_region_containing(HeapWord* addr); 142 int find_covering_region_containing(HeapWord* addr);
138 143
139 // Resize one of the regions covered by the remembered set. 144 // Resize one of the regions covered by the remembered set.
140 void resize_covered_region(MemRegion new_region); 145 virtual void resize_covered_region(MemRegion new_region);
141 146
142 // Returns the leftmost end of a committed region corresponding to a 147 // Returns the leftmost end of a committed region corresponding to a
143 // covered region before covered region "ind", or else "NULL" if "ind" is 148 // covered region before covered region "ind", or else "NULL" if "ind" is
144 // the first covered region. 149 // the first covered region.
145 HeapWord* largest_prev_committed_end(int ind) const; 150 HeapWord* largest_prev_committed_end(int ind) const;
280 } 285 }
281 286
282 CardTableModRefBS(MemRegion whole_heap, int max_covered_regions); 287 CardTableModRefBS(MemRegion whole_heap, int max_covered_regions);
283 ~CardTableModRefBS(); 288 ~CardTableModRefBS();
284 289
290 virtual void initialize();
291
285 // *** Barrier set functions. 292 // *** Barrier set functions.
286 293
287 bool has_write_ref_pre_barrier() { return false; } 294 bool has_write_ref_pre_barrier() { return false; }
288 295
289 // Record a reference update. Note that these versions are precise! 296 // Record a reference update. Note that these versions are precise!

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