vm/nursery_collector.cpp

   1 #include "master.hpp"
   2
   3 namespace factor {
   4
   5 struct nursery_policy {
   6   factor_vm* parent;
   7
   8   explicit nursery_policy(factor_vm* parent) : parent(parent) {}
   9
  10   bool should_copy_p(object* obj) {
  11     return parent->data->nursery->contains_p(obj);
  12   }
  13
  14   void promoted_object(object* obj) {}
  15
  16   void visited_object(object* obj) {}
  17 };
  18
  19 void factor_vm::collect_nursery() {
  20   /* Copy live objects from the nursery (as determined by the root set and
  21      marked cards in aging and tenured) to aging space. */
  22   collector<aging_space, nursery_policy> collector(this,
  23                                                    this->data->aging,
  24                                                    nursery_policy(this));
  25
  26   collector.visitor.visit_all_roots();
  27   gc_event* event = current_gc->event;
  28
  29   if (event)
  30     event->started_card_scan();
  31   collector.trace_cards(data->tenured, card_points_to_nursery,
  32                         card_points_to_nursery);
  33   collector.trace_cards(data->aging, card_points_to_nursery, 0xff);
  34
  35   if (event)
  36     event->ended_card_scan(collector.cards_scanned, collector.decks_scanned);
  37
  38   if (event)
  39     event->started_code_scan();
  40   collector.trace_code_heap_roots(&code->points_to_nursery);
  41   if (event)
  42     event->ended_code_scan(collector.code_blocks_scanned);
  43
  44   collector.cheneys_algorithm();
  45
  46   data->reset_nursery();
  47   code->points_to_nursery.clear();
  48 }
  49
  50 }