namespace factor { struct gc_info { uint32_t scrub_d_count; uint32_t scrub_r_count; uint32_t gc_root_count; uint32_t derived_root_count; uint32_t return_address_count; cell callsite_bitmap_size() { return scrub_d_count + scrub_r_count + gc_root_count; } cell total_bitmap_size() { return return_address_count * callsite_bitmap_size(); } cell total_bitmap_bytes() { return ((total_bitmap_size() + 7) / 8); } uint32_t* return_addresses() { return (uint32_t*)this - return_address_count; } uint32_t* base_pointer_map() { return return_addresses() - return_address_count * derived_root_count; } uint8_t* gc_info_bitmap() { return (uint8_t*)base_pointer_map() - total_bitmap_bytes(); } cell callsite_scrub_d(cell index) { return index * scrub_d_count; } cell callsite_scrub_r(cell index) { return return_address_count * scrub_d_count + index * scrub_r_count; } cell callsite_gc_roots(cell index) { return return_address_count * scrub_d_count + return_address_count * scrub_r_count + index * gc_root_count; } uint32_t lookup_base_pointer(cell index, cell derived_root) { return base_pointer_map()[index * derived_root_count + derived_root]; } cell return_address_index(cell return_address); }; }