/*

 * Copyright (c) 2017, 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

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 */

#ifndef SHARE_GC_Z_ZHEAPITERATOR_HPP

#define SHARE_GC_Z_ZHEAPITERATOR_HPP

#include "gc/z/zAddressRangeMap.hpp"

#include "gc/z/zGlobals.hpp"

#include "memory/allocation.hpp"

#include "utilities/stack.hpp"

class ZHeapIteratorBitMap;

class ZHeapIterator : public StackObj {

  friend class ZHeapIteratorRootOopClosure;

  friend class ZHeapIteratorPushOopClosure;

private:

  typedef ZAddressRangeMap<ZHeapIteratorBitMap*, ZPageSizeMinShift>         ZVisitMap;

  typedef ZAddressRangeMapIterator<ZHeapIteratorBitMap*, ZPageSizeMinShift> ZVisitMapIterator;

  typedef Stack<oop, mtGC>                                                  ZVisitStack;

  ZVisitStack _visit_stack;

  ZVisitMap   _visit_map;

  size_t object_index_max() const;

  size_t object_index(oop obj) const;

  ZHeapIteratorBitMap* object_map(oop obj);

  void push(oop obj);

  void drain(ObjectClosure* cl);

public:

  ~ZHeapIterator();

  void objects_do(ObjectClosure* cl);

};

#endif // SHARE_GC_Z_ZHEAPITERATOR_HPP