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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP
#define SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP

#include "memory/iterator.hpp"
#include "oops/oop.hpp"

class BitSet;
class Edge;
class EdgeStore;
class EdgeQueue;

// Class responsible for iterating the heap depth-first
class DFSClosure: public BasicOopIterateClosure {
 private:
  static EdgeStore* _edge_store;
  static BitSet*    _mark_bits;
  static const Edge*_start_edge;
  static size_t _max_depth;
  static bool _ignore_root_set;
  DFSClosure* _parent;
  const oop* _reference;
  size_t _depth;

  void add_chain();
  void closure_impl(const oop* reference, const oop pointee);

  DFSClosure* parent() const { return _parent; }
  const oop* reference() const { return _reference; }

  DFSClosure(DFSClosure* parent, size_t depth);
  DFSClosure();

 public:
  static void find_leaks_from_edge(EdgeStore* edge_store, BitSet* mark_bits, const Edge* start_edge);
  static void find_leaks_from_root_set(EdgeStore* edge_store, BitSet* mark_bits);

  virtual void do_oop(oop* ref);
  virtual void do_oop(narrowOop* ref);
};

#endif // SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP