namespace factor {
-struct nursery_policy {
+struct nursery_copier : no_fixup {
bump_allocator* nursery;
+ aging_space* aging;
- explicit nursery_policy(bump_allocator* nursery) : nursery(nursery) {}
+ nursery_copier(bump_allocator* nursery, aging_space* aging)
+ : nursery(nursery), aging(aging) { }
- bool should_copy_p(object* obj) {
- return nursery->contains_p(obj);
- }
+ object* fixup_data(object* obj) {
+ if (!nursery->contains_p(obj)) {
+ return obj;
+ }
+
+ // The while-loop is a needed micro-optimization.
+ while (obj->forwarding_pointer_p()) {
+ obj = obj->forwarding_pointer();
+ }
+
+ if (!nursery->contains_p(obj)) {
+ return obj;
+ }
- void promoted_object(object* obj) {}
+ cell size = obj->size();
+ object* newpointer = aging->allot(size);
+ if (!newpointer)
+ throw must_start_gc_again();
- void visited_object(object* obj) {}
+ memcpy(newpointer, obj, size);
+ obj->forward_to(newpointer);
+ return newpointer;
+ }
};
void factor_vm::collect_nursery() {
+ // Copy live objects from the nursery (as determined by the root set and
+ // marked cards in aging and tenured) to aging space.
+ slot_visitor<nursery_copier>
+ visitor(this, nursery_copier(data->nursery, data->aging));
- /* Copy live objects from the nursery (as determined by the root set and
- marked cards in aging and tenured) to aging space. */
- nursery_policy policy(this->data->nursery);
- collector<aging_space, nursery_policy>
- collector(this, this->data->aging, policy);
+ cell scan = data->aging->start + data->aging->occupied_space();
- collector.visitor.visit_all_roots();
+ visitor.visit_all_roots();
gc_event* event = current_gc->event;
if (event)
- event->started_card_scan();
- collector.trace_cards(data->tenured, card_points_to_nursery,
- card_points_to_nursery);
- collector.trace_cards(data->aging, card_points_to_nursery, 0xff);
-
- if (event)
- event->ended_card_scan(collector.cards_scanned, collector.decks_scanned);
+ event->reset_timer();
+ visitor.visit_cards(data->tenured, card_points_to_nursery,
+ card_points_to_nursery);
+ visitor.visit_cards(data->aging, card_points_to_nursery, 0xff);
+ if (event) {
+ event->ended_phase(PHASE_CARD_SCAN);
+ event->cards_scanned += visitor.cards_scanned;
+ event->decks_scanned += visitor.decks_scanned;
+ }
if (event)
- event->started_code_scan();
- collector.trace_code_heap_roots(&code->points_to_nursery);
- if (event)
- event->ended_code_scan(code->points_to_nursery.size());
+ event->reset_timer();
+ visitor.visit_code_heap_roots(&code->points_to_nursery);
+ if (event) {
+ event->ended_phase(PHASE_CODE_SCAN);
+ event->code_blocks_scanned += code->points_to_nursery.size();
+ }
- collector.cheneys_algorithm();
+ visitor.cheneys_algorithm(data->aging, scan);
data->reset_nursery();
code->points_to_nursery.clear();