/*
 * Copyright (c) 2014, 2019, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP
#define SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP

#include "memory/iterator.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);
  void do_root(const oop* ref);

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

#endif // SHARE_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP