vm/aging_collector.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 aging_collector::aging_collector(factor_vm *parent_) :
   7         copying_collector<aging_space,aging_policy>(
   8                 parent_,
   9                 parent_->data->aging,
  10                 aging_policy(parent_)) {}
  11
  12 void factor_vm::collect_aging()
  13 {
  14         /* Promote objects referenced from tenured space to tenured space, copy
  15         everything else to the aging semi-space, and reset the nursery pointer. */
  16         {
  17                 /* Change the op so that if we fail here, we proceed to a full
  18                 tenured collection. We are collecting to tenured space, and
  19                 cards were unmarked, so we can't proceed with a to_tenured
  20                 collection. */
  21                 current_gc->op = collect_to_tenured_op;
  22
  23                 to_tenured_collector collector(this);
  24
  25                 current_gc->event->started_code_scan();
  26                 collector.trace_cards(data->tenured,
  27                         card_points_to_aging,
  28                         full_unmarker());
  29                 current_gc->event->ended_card_scan(collector.cards_scanned,collector.decks_scanned);
  30
  31                 collector.tenure_reachable_objects();
  32         }
  33         {
  34                 /* If collection fails here, do a to_tenured collection. */
  35                 current_gc->op = collect_aging_op;
  36
  37                 std::swap(data->aging,data->aging_semispace);
  38                 data->reset_generation(data->aging);
  39
  40                 aging_collector collector(this);
  41
  42                 collector.trace_roots();
  43                 collector.trace_contexts();
  44
  45                 current_gc->event->started_code_scan();
  46                 collector.trace_code_heap_roots(&code->points_to_aging);
  47                 current_gc->event->ended_code_scan(collector.code_blocks_scanned);
  48
  49                 collector.cheneys_algorithm();
  50
  51                 current_gc->event->started_code_sweep();
  52                 update_code_heap_for_minor_gc(&code->points_to_aging);
  53                 current_gc->event->ended_code_sweep();
  54
  55                 data->reset_generation(&nursery);
  56                 code->points_to_nursery.clear();
  57         }
  58 }
  59
  60 }