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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * published by the Free Software Foundation.

  *

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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

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 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP

 #include "gc_implementation/parallelScavenge/psPromotionLAB.hpp"

 #include "gc_implementation/shared/gcTrace.hpp"

 #include "gc_implementation/shared/copyFailedInfo.hpp"

 #include "memory/allocation.hpp"

 #include "memory/padded.hpp"

 #include "utilities/globalDefinitions.hpp"

 #include "utilities/taskqueue.hpp"

 //

 // psPromotionManager is used by a single thread to manage object survival

 // during a scavenge. The promotion manager contains thread local data only.

 //

 // NOTE! Be careful when allocating the stacks on cheap. If you are going

 // to use a promotion manager in more than one thread, the stacks MUST be

 // on cheap. This can lead to memory leaks, though, as they are not auto

 // deallocated.

 //

 // FIX ME FIX ME Add a destructor, and don't rely on the user to drain/flush/deallocate!

 //

 // Move to some global location

 #define HAS_BEEN_MOVED 0x1501d01d

 // End move to some global location

 class MutableSpace;

 class PSOldGen;

 class ParCompactionManager;

 class PSPromotionManager VALUE_OBJ_CLASS_SPEC {

   friend class PSScavenge;

   friend class PSRefProcTaskExecutor;

  private:

   static PaddedEnd<PSPromotionManager>* _manager_array;

   static OopStarTaskQueueSet*           _stack_array_depth;

   static PSOldGen*                      _old_gen;

   static MutableSpace*                  _young_space;

 #if TASKQUEUE_STATS

   size_t                              _masked_pushes;

   size_t                              _masked_steals;

   size_t                              _arrays_chunked;

   size_t                              _array_chunks_processed;

   void print_taskqueue_stats(uint i) const;

   void print_local_stats(uint i) const;

   static void print_stats();

   void reset_stats();

 #endif // TASKQUEUE_STATS

   PSYoungPromotionLAB                 _young_lab;

   PSOldPromotionLAB                   _old_lab;

   bool                                _young_gen_is_full;

   bool                                _old_gen_is_full;

   OopStarTaskQueue                    _claimed_stack_depth;

   OverflowTaskQueue<oop, mtGC>        _claimed_stack_breadth;

   bool                                _totally_drain;

   uint                                _target_stack_size;

   uint                                _array_chunk_size;

   uint                                _min_array_size_for_chunking;

   PromotionFailedInfo                 _promotion_failed_info;

   // Accessors

   static PSOldGen* old_gen()         { return _old_gen; }

   static MutableSpace* young_space() { return _young_space; }

   inline static PSPromotionManager* manager_array(int index);

   template <class T> inline void claim_or_forward_internal_depth(T* p);

   // On the task queues we push reference locations as well as

   // partially-scanned arrays (in the latter case, we push an oop to

   // the from-space image of the array and the length on the

   // from-space image indicates how many entries on the array we still

   // need to scan; this is basically how ParNew does partial array

   // scanning too). To be able to distinguish between reference

   // locations and partially-scanned array oops we simply mask the

   // latter oops with 0x01. The next three methods do the masking,

   // unmasking, and checking whether the oop is masked or not. Notice

   // that the signature of the mask and unmask methods looks a bit

   // strange, as they accept and return different types (oop and

   // oop*). This is because of the difference in types between what

   // the task queue holds (oop*) and oops to partially-scanned arrays

   // (oop). We do all the necessary casting in the mask / unmask

   // methods to avoid sprinkling the rest of the code with more casts.

   // These are added to the taskqueue so PS_CHUNKED_ARRAY_OOP_MASK (or any

   // future masks) can't conflict with COMPRESSED_OOP_MASK

 #define PS_CHUNKED_ARRAY_OOP_MASK  0x2

   bool is_oop_masked(StarTask p) {

     // If something is marked chunked it's always treated like wide oop*

     return (((intptr_t)(oop*)p) & PS_CHUNKED_ARRAY_OOP_MASK) ==

                                   PS_CHUNKED_ARRAY_OOP_MASK;

   }

   oop* mask_chunked_array_oop(oop obj) {

     assert(!is_oop_masked((oop*) obj), "invariant");

     oop* ret = (oop*) (cast_from_oop<uintptr_t>(obj) | PS_CHUNKED_ARRAY_OOP_MASK);

     assert(is_oop_masked(ret), "invariant");

     return ret;

   }

   oop unmask_chunked_array_oop(StarTask p) {

     assert(is_oop_masked(p), "invariant");

     assert(!p.is_narrow(), "chunked array oops cannot be narrow");

     oop *chunk = (oop*)p;  // cast p to oop (uses conversion operator)

     oop ret = oop((oop*)((uintptr_t)chunk & ~PS_CHUNKED_ARRAY_OOP_MASK));

     assert(!is_oop_masked((oop*) ret), "invariant");

     return ret;

   }

   template <class T> void  process_array_chunk_work(oop obj,

                                                     int start, int end);

   void process_array_chunk(oop old);

   template <class T> void push_depth(T* p) {

     claimed_stack_depth()->push(p);

   }

  protected:

   static OopStarTaskQueueSet* stack_array_depth()   { return _stack_array_depth; }

  public:

   // Static

   static void initialize();

   static void pre_scavenge();

   static bool post_scavenge(YoungGCTracer& gc_tracer);

   static PSPromotionManager* gc_thread_promotion_manager(int index);

   static PSPromotionManager* vm_thread_promotion_manager();

   static bool steal_depth(int queue_num, int* seed, StarTask& t) {

     return stack_array_depth()->steal(queue_num, seed, t);

   }

   PSPromotionManager();

   // Accessors

   OopStarTaskQueue* claimed_stack_depth() {

     return &_claimed_stack_depth;

   }

   bool young_gen_is_full()             { return _young_gen_is_full; }

   bool old_gen_is_full()               { return _old_gen_is_full; }

   void set_old_gen_is_full(bool state) { _old_gen_is_full = state; }

   // Promotion methods

   template<bool promote_immediately> oop copy_to_survivor_space(oop o);

   oop oop_promotion_failed(oop obj, markOop obj_mark);

   void reset();

   void flush_labs();

   void drain_stacks(bool totally_drain) {

     drain_stacks_depth(totally_drain);

   }

  public:

   void drain_stacks_cond_depth() {

     if (claimed_stack_depth()->size() > _target_stack_size) {

       drain_stacks_depth(false);

     }

   }

   void drain_stacks_depth(bool totally_drain);

   bool stacks_empty() {

     return claimed_stack_depth()->is_empty();

   }

   inline void process_popped_location_depth(StarTask p);

   template <class T> inline void claim_or_forward_depth(T* p);

   TASKQUEUE_STATS_ONLY(inline void record_steal(StarTask& p);)

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSPROMOTIONMANAGER_HPP