27 
  28 #include "gc_implementation/shared/ageTable.hpp"
  29 #include "gc_implementation/shared/cSpaceCounters.hpp"
  30 #include "gc_implementation/shared/generationCounters.hpp"
  31 #include "gc_implementation/shared/copyFailedInfo.hpp"
  32 #include "memory/generation.inline.hpp"
  33 #include "utilities/stack.hpp"
  34 
  35 class EdenSpace;
  36 class ContiguousSpace;
  37 class ScanClosure;
  38 class STWGCTimer;
  39 
  40 // DefNewGeneration is a young generation containing eden, from- and
  41 // to-space.
  42 
  43 class DefNewGeneration: public Generation {
  44   friend class VMStructs;
  45 
  46 protected:
  47   Generation* _next_gen;
  48   uint        _tenuring_threshold;   // Tenuring threshold for next collection.
  49   ageTable    _age_table;
  50   // Size of object to pretenure in words; command line provides bytes
  51   size_t      _pretenure_size_threshold_words;
  52 
  53   ageTable*   age_table() { return &_age_table; }
  54 
  55   // Initialize state to optimistically assume no promotion failure will
  56   // happen.
  57   void   init_assuming_no_promotion_failure();
  58   // True iff a promotion has failed in the current collection.
  59   bool   _promotion_failed;
  60   bool   promotion_failed() { return _promotion_failed; }
  61   PromotionFailedInfo _promotion_failed_info;
  62 
  63   // Handling promotion failure.  A young generation collection
  64   // can fail if a live object cannot be copied out of its
  65   // location in eden or from-space during the collection.  If
  66   // a collection fails, the young generation is left in a
  67   // consistent state such that it can be collected by a

  27 
  28 #include "gc_implementation/shared/ageTable.hpp"
  29 #include "gc_implementation/shared/cSpaceCounters.hpp"
  30 #include "gc_implementation/shared/generationCounters.hpp"
  31 #include "gc_implementation/shared/copyFailedInfo.hpp"
  32 #include "memory/generation.inline.hpp"
  33 #include "utilities/stack.hpp"
  34 
  35 class EdenSpace;
  36 class ContiguousSpace;
  37 class ScanClosure;
  38 class STWGCTimer;
  39 
  40 // DefNewGeneration is a young generation containing eden, from- and
  41 // to-space.
  42 
  43 class DefNewGeneration: public Generation {
  44   friend class VMStructs;
  45 
  46 protected:
  47   Generation* _old_gen;
  48   uint        _tenuring_threshold;   // Tenuring threshold for next collection.
  49   ageTable    _age_table;
  50   // Size of object to pretenure in words; command line provides bytes
  51   size_t      _pretenure_size_threshold_words;
  52 
  53   ageTable*   age_table() { return &_age_table; }
  54 
  55   // Initialize state to optimistically assume no promotion failure will
  56   // happen.
  57   void   init_assuming_no_promotion_failure();
  58   // True iff a promotion has failed in the current collection.
  59   bool   _promotion_failed;
  60   bool   promotion_failed() { return _promotion_failed; }
  61   PromotionFailedInfo _promotion_failed_info;
  62 
  63   // Handling promotion failure.  A young generation collection
  64   // can fail if a live object cannot be copied out of its
  65   // location in eden or from-space during the collection.  If
  66   // a collection fails, the young generation is left in a
  67   // consistent state such that it can be collected by a