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 class MutableSpace; 26 class ObjectStartArray; 27 class PSPromotionManager; 28 class GCTaskQueue; 29 30 class CardTableExtension : public CardTableModRefBS { 31 private: 32 // Support methods for resizing the card table. 33 // resize_commit_uncommit() returns true if the pages were committed or 34 // uncommitted 35 bool resize_commit_uncommit(int changed_region, MemRegion new_region); 36 void resize_update_card_table_entries(int changed_region, 37 MemRegion new_region); 38 void resize_update_committed_table(int changed_region, MemRegion new_region); 39 void resize_update_covered_table(int changed_region, MemRegion new_region); 40 41 protected: 42 43 static void verify_all_young_refs_precise_helper(MemRegion mr); 44 91 // Allows adjustment of the base and size of the covered regions 92 void resize_covered_region(MemRegion new_region); 93 // Finds the covered region to resize based on the start address 94 // of the covered regions. 95 void resize_covered_region_by_start(MemRegion new_region); 96 // Finds the covered region to resize based on the end address 97 // of the covered regions. 98 void resize_covered_region_by_end(int changed_region, MemRegion new_region); 99 // Finds the lowest start address of a covered region that is 100 // previous (i.e., lower index) to the covered region with index "ind". 101 HeapWord* lowest_prev_committed_start(int ind) const; 102 103 #ifdef ASSERT 104 105 bool is_valid_card_address(jbyte* addr) { 106 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); 107 } 108 109 #endif // ASSERT 110 }; | 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_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP 27 28 #include "memory/cardTableModRefBS.hpp" 29 30 class MutableSpace; 31 class ObjectStartArray; 32 class PSPromotionManager; 33 class GCTaskQueue; 34 35 class CardTableExtension : public CardTableModRefBS { 36 private: 37 // Support methods for resizing the card table. 38 // resize_commit_uncommit() returns true if the pages were committed or 39 // uncommitted 40 bool resize_commit_uncommit(int changed_region, MemRegion new_region); 41 void resize_update_card_table_entries(int changed_region, 42 MemRegion new_region); 43 void resize_update_committed_table(int changed_region, MemRegion new_region); 44 void resize_update_covered_table(int changed_region, MemRegion new_region); 45 46 protected: 47 48 static void verify_all_young_refs_precise_helper(MemRegion mr); 49 96 // Allows adjustment of the base and size of the covered regions 97 void resize_covered_region(MemRegion new_region); 98 // Finds the covered region to resize based on the start address 99 // of the covered regions. 100 void resize_covered_region_by_start(MemRegion new_region); 101 // Finds the covered region to resize based on the end address 102 // of the covered regions. 103 void resize_covered_region_by_end(int changed_region, MemRegion new_region); 104 // Finds the lowest start address of a covered region that is 105 // previous (i.e., lower index) to the covered region with index "ind". 106 HeapWord* lowest_prev_committed_start(int ind) const; 107 108 #ifdef ASSERT 109 110 bool is_valid_card_address(jbyte* addr) { 111 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); 112 } 113 114 #endif // ASSERT 115 }; 116 117 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |