72   //   Before the collection
  73   //     Objects are in eden or from-space
  74   //     All roots into the young generation point into eden or from-space.
  75   //
  76   //   After a failed collection
  77   //     Objects may be in eden, from-space, or to-space
  78   //     An object A in eden or from-space may have a copy B
  79   //       in to-space.  If B exists, all roots that once pointed
  80   //       to A must now point to B.
  81   //     All objects in the young generation are unmarked.
  82   //     Eden, from-space, and to-space will all be collected by
  83   //       the full collection.
  84   void handle_promotion_failure(oop);
  85 
  86   // In the absence of promotion failure, we wouldn't look at "from-space"
  87   // objects after a young-gen collection.  When promotion fails, however,
  88   // the subsequent full collection will look at from-space objects:
  89   // therefore we must remove their forwarding pointers.
  90   void remove_forwarding_pointers();
  91 


  92   // Preserved marks
  93   PreservedMarksSet _preserved_marks_set;
  94 
  95   // Promotion failure handling
  96   ExtendedOopClosure *_promo_failure_scan_stack_closure;
  97   void set_promo_failure_scan_stack_closure(ExtendedOopClosure *scan_stack_closure) {
  98     _promo_failure_scan_stack_closure = scan_stack_closure;
  99   }
 100 
 101   Stack<oop, mtGC> _promo_failure_scan_stack;
 102   void drain_promo_failure_scan_stack(void);
 103   bool _promo_failure_drain_in_progress;
 104 
 105   // Performance Counters
 106   GenerationCounters*  _gen_counters;
 107   CSpaceCounters*      _eden_counters;
 108   CSpaceCounters*      _from_counters;
 109   CSpaceCounters*      _to_counters;
 110 
 111   // sizing information

  72   //   Before the collection
  73   //     Objects are in eden or from-space
  74   //     All roots into the young generation point into eden or from-space.
  75   //
  76   //   After a failed collection
  77   //     Objects may be in eden, from-space, or to-space
  78   //     An object A in eden or from-space may have a copy B
  79   //       in to-space.  If B exists, all roots that once pointed
  80   //       to A must now point to B.
  81   //     All objects in the young generation are unmarked.
  82   //     Eden, from-space, and to-space will all be collected by
  83   //       the full collection.
  84   void handle_promotion_failure(oop);
  85 
  86   // In the absence of promotion failure, we wouldn't look at "from-space"
  87   // objects after a young-gen collection.  When promotion fails, however,
  88   // the subsequent full collection will look at from-space objects:
  89   // therefore we must remove their forwarding pointers.
  90   void remove_forwarding_pointers();
  91 
  92   virtual void restore_preserved_marks();
  93 
  94   // Preserved marks
  95   PreservedMarksSet _preserved_marks_set;
  96 
  97   // Promotion failure handling
  98   ExtendedOopClosure *_promo_failure_scan_stack_closure;
  99   void set_promo_failure_scan_stack_closure(ExtendedOopClosure *scan_stack_closure) {
 100     _promo_failure_scan_stack_closure = scan_stack_closure;
 101   }
 102 
 103   Stack<oop, mtGC> _promo_failure_scan_stack;
 104   void drain_promo_failure_scan_stack(void);
 105   bool _promo_failure_drain_in_progress;
 106 
 107   // Performance Counters
 108   GenerationCounters*  _gen_counters;
 109   CSpaceCounters*      _eden_counters;
 110   CSpaceCounters*      _from_counters;
 111   CSpaceCounters*      _to_counters;
 112 
 113   // sizing information