62 
  63   // Max capacity of the reserved space for the counts table
  64   size_t _reserved_max_card_num;
  65 
  66   // CardTable bottom.
  67   const jbyte* _ct_bot;
  68 
  69   // Barrier set
  70   CardTableModRefBS* _ct_bs;
  71 
  72   // Returns true if the card counts table has been reserved.
  73   bool has_reserved_count_table() { return _card_counts != NULL; }
  74 
  75   // Returns true if the card counts table has been reserved and committed.
  76   bool has_count_table() {
  77     return has_reserved_count_table();
  78   }
  79 
  80   size_t ptr_2_card_num(const jbyte* card_ptr) {
  81     assert(card_ptr >= _ct_bot,
  82            err_msg("Invalid card pointer: "
  83                    "card_ptr: " PTR_FORMAT ", "
  84                    "_ct_bot: " PTR_FORMAT,
  85                    p2i(card_ptr), p2i(_ct_bot)));
  86     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
  87     assert(card_num < _reserved_max_card_num,
  88            err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
  89     return card_num;
  90   }
  91 
  92   jbyte* card_num_2_ptr(size_t card_num) {
  93     assert(card_num < _reserved_max_card_num,
  94            err_msg("card num out of range: " SIZE_FORMAT, card_num));
  95     return (jbyte*) (_ct_bot + card_num);
  96   }
  97 
  98   // Clear the counts table for the given (exclusive) index range.
  99   void clear_range(size_t from_card_num, size_t to_card_num);
 100 
 101  public:
 102   G1CardCounts(G1CollectedHeap* g1h);
 103 
 104   // Return the number of slots needed for a card counts table
 105   // that covers mem_region_words words.
 106   static size_t compute_size(size_t mem_region_size_in_words);
 107 
 108   // Returns how many bytes of the heap a single byte of the card counts table
 109   // corresponds to.
 110   static size_t heap_map_factor();
 111 
 112   void initialize(G1RegionToSpaceMapper* mapper);
 113 
 114   // Increments the refinement count for the given card.

  62 
  63   // Max capacity of the reserved space for the counts table
  64   size_t _reserved_max_card_num;
  65 
  66   // CardTable bottom.
  67   const jbyte* _ct_bot;
  68 
  69   // Barrier set
  70   CardTableModRefBS* _ct_bs;
  71 
  72   // Returns true if the card counts table has been reserved.
  73   bool has_reserved_count_table() { return _card_counts != NULL; }
  74 
  75   // Returns true if the card counts table has been reserved and committed.
  76   bool has_count_table() {
  77     return has_reserved_count_table();
  78   }
  79 
  80   size_t ptr_2_card_num(const jbyte* card_ptr) {
  81     assert(card_ptr >= _ct_bot,
  82            "Invalid card pointer: "
  83            "card_ptr: " PTR_FORMAT ", "
  84            "_ct_bot: " PTR_FORMAT,
  85            p2i(card_ptr), p2i(_ct_bot));
  86     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
  87     assert(card_num < _reserved_max_card_num,
  88            "card pointer out of range: " PTR_FORMAT, p2i(card_ptr));
  89     return card_num;
  90   }
  91 
  92   jbyte* card_num_2_ptr(size_t card_num) {
  93     assert(card_num < _reserved_max_card_num,
  94            "card num out of range: " SIZE_FORMAT, card_num);
  95     return (jbyte*) (_ct_bot + card_num);
  96   }
  97 
  98   // Clear the counts table for the given (exclusive) index range.
  99   void clear_range(size_t from_card_num, size_t to_card_num);
 100 
 101  public:
 102   G1CardCounts(G1CollectedHeap* g1h);
 103 
 104   // Return the number of slots needed for a card counts table
 105   // that covers mem_region_words words.
 106   static size_t compute_size(size_t mem_region_size_in_words);
 107 
 108   // Returns how many bytes of the heap a single byte of the card counts table
 109   // corresponds to.
 110   static size_t heap_map_factor();
 111 
 112   void initialize(G1RegionToSpaceMapper* mapper);
 113 
 114   // Increments the refinement count for the given card.