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                 gc_event *event = current_gc->event;
  26
  27                 if(event) event->started_card_scan();
  28                 collector.trace_cards(data->tenured,
  29                         card_points_to_aging,
  30                         full_unmarker());
  31                 if(event) event->ended_card_scan(collector.cards_scanned,collector.decks_scanned);
  32
  33                 if(event) event->started_code_scan();
  34                 collector.trace_code_heap_roots(&code->points_to_aging);
  35                 if(event) event->ended_code_scan(collector.code_blocks_scanned);
  36
  37                 collector.tenure_reachable_objects();
  38         }
  39         {
  40                 /* If collection fails here, do a to_tenured collection. */
  41                 current_gc->op = collect_aging_op;
  42
  43                 std::swap(data->aging,data->aging_semispace);
  44                 data->reset_generation(data->aging);
  45
  46                 aging_collector collector(this);
  47
  48                 collector.trace_roots();
  49                 collector.trace_contexts();
  50
  51                 collector.cheneys_algorithm();
  52
  53                 data->reset_generation(&nursery);
  54                 code->clear_remembered_set();
  55         }
  56 }
  57
  58 }