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_SHENANDOAHCONNECTIONMATRIX_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHCONNECTIONMATRIX_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 
  29 class ShenandoahConnectionMatrix : public CHeapObj<mtGC> {
  30 private:
  31   const uint _stride;
  32   char* _matrix;
  33 
  34   size_t index_of(uint from_idx, uint to_idx) const;
  35 
  36 public:
  37   ShenandoahConnectionMatrix(uint max_regions);
  38 
  39   ~ShenandoahConnectionMatrix();
  40 
  41   bool is_connected(uint from_idx, uint to_idx) const;
  42 
  43   void set_connected(uint from_idx, uint to_idx, bool connected);
  44   void clear_region_outbound(uint idx);
  45   void clear_region(uint idx);
  46   void clear_all();
  47 
  48   address matrix_addr() { return (address) _matrix; }
  49   uint stride() { return _stride; }
  50   void print_on(outputStream* st) const;
  51 };
  52 
  53 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHCONNECTIONMATRIX_HPP