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 /*

  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP

 #include "memory/genOopClosures.hpp"

 #include "memory/generation.hpp"

 #include "runtime/os.hpp"

 #include "utilities/taskqueue.hpp"

 // A BufferingOops closure tries to separate out the cost of finding roots

 // from the cost of applying closures to them.  It maintains an array of

 // ref-containing locations.  Until the array is full, applying the closure

 // to an oop* merely records that location in the array.  Since this

 // closure app cost is small, an elapsed timer can approximately attribute

 // all of this cost to the cost of finding the roots.  When the array fills

 // up, the wrapped closure is applied to all elements, keeping track of

 // this elapsed time of this process, and leaving the array empty.

 // The caller must be sure to call "done" to process any unprocessed

 // buffered entriess.

 class Generation;

 class HeapRegion;

 class BufferingOopClosure: public OopClosure {

 protected:

   enum PrivateConstants {

     BufferLength = 1024

   };

   StarTask  _buffer[BufferLength];

   StarTask* _buffer_top;

   StarTask* _buffer_curr;

   OopClosure* _oc;

   double      _closure_app_seconds;

   void process_buffer () {

     double start = os::elapsedTime();

     for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {

       if (curr->is_narrow()) {

         assert(UseCompressedOops, "Error");

         _oc->do_oop((narrowOop*)(*curr));

       } else {

         _oc->do_oop((oop*)(*curr));

       }

     }

     _buffer_curr = _buffer;

     _closure_app_seconds += (os::elapsedTime() - start);

   }

   template <class T> inline void do_oop_work(T* p) {

     if (_buffer_curr == _buffer_top) {

       process_buffer();

     }

     StarTask new_ref(p);

     *_buffer_curr = new_ref;

     ++_buffer_curr;

   }

 public:

   virtual void do_oop(narrowOop* p) { do_oop_work(p); }

   virtual void do_oop(oop* p)       { do_oop_work(p); }

   void done () {

     if (_buffer_curr > _buffer) {

       process_buffer();

     }

   }

   double closure_app_seconds () {

     return _closure_app_seconds;

   }

   BufferingOopClosure (OopClosure *oc) :

     _oc(oc),

     _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),

     _closure_app_seconds(0.0) { }

 };

 class BufferingOopsInGenClosure: public OopsInGenClosure {

   BufferingOopClosure _boc;

   OopsInGenClosure* _oc;

  protected:

   template <class T> inline void do_oop_work(T* p) {

     assert(generation()->is_in_reserved((void*)p), "Must be in!");

     _boc.do_oop(p);

   }

  public:

   BufferingOopsInGenClosure(OopsInGenClosure *oc) :

     _boc(oc), _oc(oc) {}

   virtual void do_oop(narrowOop* p) { do_oop_work(p); }

   virtual void do_oop(oop* p)       { do_oop_work(p); }

   void done() {

     _boc.done();

   }

   double closure_app_seconds () {

     return _boc.closure_app_seconds();

   }

   void set_generation(Generation* gen) {

     OopsInGenClosure::set_generation(gen);

     _oc->set_generation(gen);

   }

   void reset_generation() {

     // Make sure we finish the current work with the current generation.

     _boc.done();

     OopsInGenClosure::reset_generation();

     _oc->reset_generation();

   }

 };

 class BufferingOopsInHeapRegionClosure: public OopsInHeapRegionClosure {

 private:

   enum PrivateConstants {

     BufferLength = 1024

   };

   StarTask     _buffer[BufferLength];

   StarTask*    _buffer_top;

   StarTask*    _buffer_curr;

   HeapRegion*  _hr_buffer[BufferLength];

   HeapRegion** _hr_curr;

   OopsInHeapRegionClosure*  _oc;

   double                    _closure_app_seconds;

   void process_buffer () {

     assert((_hr_curr - _hr_buffer) == (_buffer_curr - _buffer),

            "the two lengths should be the same");

     double start = os::elapsedTime();

     HeapRegion** hr_curr = _hr_buffer;

     HeapRegion*  hr_prev = NULL;

     for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {

       HeapRegion* region = *hr_curr;

       if (region != hr_prev) {

         _oc->set_region(region);

         hr_prev = region;

       }

       if (curr->is_narrow()) {

         assert(UseCompressedOops, "Error");

         _oc->do_oop((narrowOop*)(*curr));

       } else {

         _oc->do_oop((oop*)(*curr));

       }

       ++hr_curr;

     }

     _buffer_curr = _buffer;

     _hr_curr = _hr_buffer;

     _closure_app_seconds += (os::elapsedTime() - start);

   }

 public:

   virtual void do_oop(narrowOop* p) { do_oop_work(p); }

   virtual void do_oop(      oop* p) { do_oop_work(p); }

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

     if (_buffer_curr == _buffer_top) {

       assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");

       process_buffer();

     }

     StarTask new_ref(p);

     *_buffer_curr = new_ref;

     ++_buffer_curr;

     *_hr_curr = _from;

     ++_hr_curr;

   }

   void done () {

     if (_buffer_curr > _buffer) {

       assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");

       process_buffer();

     }

   }

   double closure_app_seconds () {

     return _closure_app_seconds;

   }

   BufferingOopsInHeapRegionClosure (OopsInHeapRegionClosure *oc) :

     _oc(oc),

     _buffer_curr(_buffer), _buffer_top(_buffer + BufferLength),

     _hr_curr(_hr_buffer),

     _closure_app_seconds(0.0) { }

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_BUFFERINGOOPCLOSURE_HPP