vm/aging_collector.cpp

   1 #include "master.hpp"
   2
   3 namespace factor {
   4
   5 aging_collector::aging_collector(factor_vm* parent_)
   6     : copying_collector<aging_space, aging_policy>(parent_,
   7                                                    parent_->data->aging,
   8                                                    aging_policy(parent_)) {}
   9
  10 void factor_vm::collect_aging() {
  11   /* Promote objects referenced from tenured space to tenured space, copy
  12      everything else to the aging semi-space, and reset the nursery pointer. */
  13   {
  14     /* Change the op so that if we fail here, an assertion will be
  15        raised. */
  16     current_gc->op = collect_to_tenured_op;
  17
  18     to_tenured_collector collector(this);
  19
  20     gc_event* event = current_gc->event;
  21
  22     if (event)
  23       event->started_card_scan();
  24     collector.trace_cards(data->tenured, card_points_to_aging, full_unmarker());
  25     if (event)
  26       event->ended_card_scan(collector.cards_scanned, collector.decks_scanned);
  27
  28     if (event)
  29       event->started_code_scan();
  30     collector.trace_code_heap_roots(&code->points_to_aging);
  31     if (event)
  32       event->ended_code_scan(collector.code_blocks_scanned);
  33
  34     collector.tenure_reachable_objects();
  35   }
  36   {
  37     /* If collection fails here, do a to_tenured collection. */
  38     current_gc->op = collect_aging_op;
  39
  40     std::swap(data->aging, data->aging_semispace);
  41     data->reset_generation(data->aging);
  42
  43     aging_collector collector(this);
  44
  45     collector.trace_roots();
  46     collector.trace_contexts();
  47
  48     collector.cheneys_algorithm();
  49
  50     data->reset_generation(&nursery);
  51     code->clear_remembered_set();
  52   }
  53 }
  54
  55 }