/*

 * Copyright (c) 2014, 2018, 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.

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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 ExtendedOopClosure {

 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