Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2005-2009 Sun Microsystems, Inc.  All Rights Reserved.

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

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * 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,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 // Move to some global location

 #define HAS_BEEN_MOVED 0x1501d01d

 // End move to some global location

 class MutableSpace;

 class PSOldGen;

 class ParCompactionManager;

 class ObjectStartArray;

 class ParallelCompactData;

 class ParMarkBitMap;

 class ParCompactionManager : public CHeapObj {

   friend class ParallelTaskTerminator;

   friend class ParMarkBitMap;

   friend class PSParallelCompact;

   friend class StealRegionCompactionTask;

   friend class UpdateAndFillClosure;

   friend class RefProcTaskExecutor;

  public:

 // ------------------------  Don't putback if not needed

   // Actions that the compaction manager should take.

   enum Action {

     Update,

     Copy,

     UpdateAndCopy,

     CopyAndUpdate,

     VerifyUpdate,

     ResetObjects,

     NotValid

   };

 // ------------------------  End don't putback if not needed

  private:

   // 32-bit:  4K * 8 = 32KiB; 64-bit:  8K * 16 = 128KiB

   #define OBJARRAY_QUEUE_SIZE (1 << NOT_LP64(12) LP64_ONLY(13))

   typedef GenericTaskQueue<ObjArrayTask, OBJARRAY_QUEUE_SIZE> ObjArrayTaskQueue;

   typedef GenericTaskQueueSet<ObjArrayTaskQueue> ObjArrayTaskQueueSet;

   #undef OBJARRAY_QUEUE_SIZE

   static ParCompactionManager** _manager_array;

   static OopTaskQueueSet*       _stack_array;

   static ObjArrayTaskQueueSet*  _objarray_queues;

   static ObjectStartArray*      _start_array;

   static RegionTaskQueueSet*    _region_array;

   static PSOldGen*              _old_gen;

 private:

   OopTaskQueue                  _marking_stack;

   GrowableArray<oop>*           _overflow_stack;

   typedef GrowableArray<ObjArrayTask> ObjArrayOverflowStack;

   ObjArrayTaskQueue             _objarray_queue;

   ObjArrayOverflowStack*        _objarray_overflow_stack;

   // Is there a way to reuse the _marking_stack for the

   // saving empty regions?  For now just create a different

   // type of TaskQueue.

 #ifdef USE_RegionTaskQueueWithOverflow

   RegionTaskQueueWithOverflow   _region_stack;

 #else

   RegionTaskQueue               _region_stack;

   GrowableArray<size_t>*        _region_overflow_stack;

 #endif

 #if 1  // does this happen enough to need a per thread stack?

   GrowableArray<Klass*>*        _revisit_klass_stack;

   GrowableArray<DataLayout*>*   _revisit_mdo_stack;

 #endif

   static ParMarkBitMap* _mark_bitmap;

   Action _action;

   static PSOldGen* old_gen()             { return _old_gen; }

   static ObjectStartArray* start_array() { return _start_array; }

   static OopTaskQueueSet* stack_array()  { return _stack_array; }

   static void initialize(ParMarkBitMap* mbm);

  protected:

   // Array of tasks.  Needed by the ParallelTaskTerminator.

   static RegionTaskQueueSet* region_array()      { return _region_array; }

   OopTaskQueue*  marking_stack()                 { return &_marking_stack; }

   GrowableArray<oop>* overflow_stack()           { return _overflow_stack; }

 #ifdef USE_RegionTaskQueueWithOverflow

   RegionTaskQueueWithOverflow* region_stack()    { return &_region_stack; }

 #else

   RegionTaskQueue*  region_stack()               { return &_region_stack; }

   GrowableArray<size_t>* region_overflow_stack() {

     return _region_overflow_stack;

   }

 #endif

   // Pushes onto the marking stack.  If the marking stack is full,

   // pushes onto the overflow stack.

   void stack_push(oop obj);

   // Do not implement an equivalent stack_pop.  Deal with the

   // marking stack and overflow stack directly.

   // Pushes onto the region stack.  If the region stack is full,

   // pushes onto the region overflow stack.

   void region_stack_push(size_t region_index);

 public:

   Action action() { return _action; }

   void set_action(Action v) { _action = v; }

   inline static ParCompactionManager* manager_array(int index);

   ParCompactionManager();

   ~ParCompactionManager();

   void allocate_stacks();

   void deallocate_stacks();

   ParMarkBitMap* mark_bitmap() { return _mark_bitmap; }

   // Take actions in preparation for a compaction.

   static void reset();

   // void drain_stacks();

   bool should_update();

   bool should_copy();

   bool should_verify_only();

   bool should_reset_only();

 #if 1

   // Probably stays as a growable array

   GrowableArray<Klass*>* revisit_klass_stack() { return _revisit_klass_stack; }

   GrowableArray<DataLayout*>* revisit_mdo_stack() { return _revisit_mdo_stack; }

 #endif

   // Save oop for later processing.  Must not fail.

   void save_for_scanning(oop m);

   // Get a oop for scanning.  If returns null, no oop were found.

   oop retrieve_for_scanning();

   inline void push_objarray(oop obj, size_t index);

   // Save region for later processing.  Must not fail.

   void save_for_processing(size_t region_index);

   // Get a region for processing.  If returns null, no region were found.

   bool retrieve_for_processing(size_t& region_index);

   // Access function for compaction managers

   static ParCompactionManager* gc_thread_compaction_manager(int index);

   static bool steal(int queue_num, int* seed, Task& t) {

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

   }

   static bool steal_objarray(int queue_num, int* seed, ObjArrayTask& t) {

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

   }

   static bool steal(int queue_num, int* seed, RegionTask& t) {

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

   }

   // Process tasks remaining on any marking stack

   void follow_marking_stacks();

   inline bool marking_stacks_empty() const;

   // Process tasks remaining on any stack

   void drain_region_stacks();

   // Process tasks remaining on any stack

   void drain_region_overflow_stack();

   // Debugging support

 #ifdef ASSERT

   bool stacks_have_been_allocated();

 #endif

 };

 inline ParCompactionManager* ParCompactionManager::manager_array(int index) {

   assert(_manager_array != NULL, "access of NULL manager_array");

   assert(index >= 0 && index <= (int)ParallelGCThreads,

     "out of range manager_array access");

   return _manager_array[index];

 }

 bool ParCompactionManager::marking_stacks_empty() const {

   return _marking_stack.size() == 0 && _overflow_stack->is_empty() &&

     _objarray_queue.size() == 0 && _objarray_overflow_stack->is_empty();

 }