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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_SHARED_LIVERANGE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP

#include "memory/memRegion.hpp"

#include "utilities/copy.hpp"

// This is a shared helper class used during phase 3 and 4 to move all the objects

// Dead regions in a Space are linked together to keep track of the live regions

// so that the live data can be traversed quickly without having to look at each

// object.

class LiveRange: public MemRegion {

public:

  LiveRange(HeapWord* bottom, HeapWord* top): MemRegion(bottom, top) {}

  void set_end(HeapWord* e) {

    assert(e >= start(), "should be a non-zero range");

    MemRegion::set_end(e);

  }

  void set_word_size(size_t ws) {

    MemRegion::set_word_size(ws);

  }

  LiveRange * next() { return (LiveRange *) end(); }

  void move_to(HeapWord* destination) {

    Copy::aligned_conjoint_words(start(), destination, word_size());

  }

};

#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_LIVERANGE_HPP