factor/vm/gc_info.hpp

60 lines
1.5 KiB
C++

namespace factor {
// gc_info should be kept in sync with:
// basis/compiler/codegen/gc-maps/gc-maps.factor
// basis/vm/vm.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) {
cell base = 0;
return base + index * scrub_d_count;
}
cell callsite_scrub_r(cell index) {
cell base = return_address_count * scrub_d_count;
return base + index * scrub_r_count;
}
cell callsite_gc_roots(cell index) {
cell base =
return_address_count * scrub_d_count +
return_address_count * scrub_r_count;
return base + 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);
};
}