src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp

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   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