-namespace factor
-{
+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 {
- u32 scrub_d_count;
- u32 scrub_r_count;
- u32 gc_root_count;
- u32 return_address_count;
-
- cell total_bitmap_size()
- {
- return return_address_count * (scrub_d_count + scrub_r_count + gc_root_count);
- }
-
- cell total_bitmap_bytes()
- {
- return ((total_bitmap_size() + 7) / 8);
- }
-
- u32 *return_addresses()
- {
- return (u32 *)((u8 *)this - return_address_count * sizeof(u32));
- }
-
- u8 *gc_info_bitmap()
- {
- return (u8 *)return_addresses() - total_bitmap_bytes();
- }
-
- cell scrub_d_base(cell index)
- {
- return index * scrub_d_count;
- }
-
- cell scrub_r_base(cell index)
- {
- return return_address_count * scrub_d_count +
- index * scrub_r_count;
- }
-
- cell spill_slot_base(cell index)
- {
- return return_address_count * scrub_d_count
- + return_address_count * scrub_r_count
- + index * gc_root_count;
- }
-
- int return_address_index(cell return_address);
+ uint32_t gc_root_count;
+ uint32_t derived_root_count;
+ uint32_t return_address_count;
+
+ cell callsite_bitmap_size() {
+ return 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_gc_roots(cell index) {
+ return 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) {
+ uint32_t* return_address_array = return_addresses();
+
+ for (cell i = 0; i < return_address_count; i++) {
+ if (return_address == return_address_array[i])
+ return i;
+ }
+
+ return (cell)-1;
+ }
};
}