1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHPARTIALGC_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHPARTIALGC_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
  29 
  30 class Thread;
  31 class ShenandoahHeapRegionSet;
  32 class ShenandoahHeap;
  33 
  34 class ShenandoahPartialGC : public CHeapObj<mtGC> {
  35 private:
  36   ShenandoahHeapRegionSet* _root_regions;
  37   ShenandoahHeap* _heap;
  38   ShenandoahConnectionMatrix* _matrix;
  39   ShenandoahObjToScanQueueSet* _task_queues;
  40   size_t* from_idxs;
  41   ShenandoahSharedFlag _has_work;
  42 
  43   void set_has_work(bool value);
  44 
  45 public:
  46   ShenandoahPartialGC(ShenandoahHeap* heap, size_t num_regions);
  47   ~ShenandoahPartialGC();
  48 
  49   bool has_work();
  50 
  51   void reset();
  52   bool prepare();
  53   void init_partial_collection();
  54   void concurrent_partial_collection();
  55   void final_partial_collection();
  56 
  57   template <class T, bool UPDATE_MATRIX>
  58   void process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue);
  59 
  60   template <bool DO_SATB>
  61   void main_loop(uint worker_id, ParallelTaskTerminator* terminator);
  62 
  63   bool check_and_handle_cancelled_gc(ParallelTaskTerminator* terminator);
  64 
  65   ShenandoahObjToScanQueueSet* task_queues();
  66 };
  67 
  68 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHPARTIALGC_HPP