vm/gc_info.hpp

   1 namespace factor
   2 {
   3
   4 struct gc_info {
   5         u32 scrub_d_count;
   6         u32 scrub_r_count;
   7         u32 gc_root_count;
   8         u32 return_address_count;
   9
  10         cell total_bitmap_size()
  11         {
  12                 return return_address_count * (scrub_d_count + scrub_r_count + gc_root_count);
  13         }
  14
  15         cell total_bitmap_bytes()
  16         {
  17                 return ((total_bitmap_size() + 7) / 8);
  18         }
  19
  20         u32 *return_addresses()
  21         {
  22                 return (u32 *)((u8 *)this - return_address_count * sizeof(u32));
  23         }
  24
  25         u8 *gc_info_bitmap()
  26         {
  27                 return (u8 *)return_addresses() - total_bitmap_bytes();
  28         }
  29
  30         cell scrub_d_base(cell index)
  31         {
  32                 return index * scrub_d_count;
  33         }
  34
  35         cell scrub_r_base(cell index)
  36         {
  37                 return return_address_count * scrub_d_count +
  38                         index * scrub_r_count;
  39         }
  40
  41         cell spill_slot_base(cell index)
  42         {
  43                 return return_address_count * scrub_d_count
  44                         + return_address_count * scrub_r_count
  45                         + index * gc_root_count;
  46         }
  47
  48         int return_address_index(u32 return_address);
  49 };
  50
  51 }