src/hotspot/share/gc/g1/g1CardTable.hpp

rev 55404 : 8226197: Reducing G1?s CPU cost with simplified write post-barrier and disabling concurrent refinement
Summary: A prototype to add a mode for G1 to use a simplified write post-barrier. Guarded by new flag G1FastWriteBarrier.

*** 60,70 ****
    }
    bool is_card_dirty(size_t card_index) {
      return _byte_map[card_index] == dirty_card_val();
    }
  
!   static CardValue g1_young_card_val() { return g1_young_gen; }
  
  /*
     Claimed and deferred bits are used together in G1 during the evacuation
     pause. These bits can have the following state transitions:
     1. The claimed bit can be put over any other card state. Except that
--- 60,73 ----
    }
    bool is_card_dirty(size_t card_index) {
      return _byte_map[card_index] == dirty_card_val();
    }
  
!   static CardValue g1_young_card_val() {
!     assert(!G1FastWriteBarrier, "should not be called");
!     return g1_young_gen;
!   }
  
  /*
     Claimed and deferred bits are used together in G1 during the evacuation
     pause. These bits can have the following state transitions:
     1. The claimed bit can be put over any other card state. Except that
*** 83,92 ****
--- 86,96 ----
    }
  
    inline void set_card_claimed(size_t card_index);
  
    void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN;
+   void verfiy_claimed_dirty_region(MemRegion mr) PRODUCT_RETURN;
    void g1_mark_as_young(const MemRegion& mr);
  
    bool mark_card_deferred(size_t card_index);
  
    bool is_card_deferred(size_t card_index) {