/*

 * Copyright (c) 2017, 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

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 */

#ifndef SHARE_GC_Z_ZHEAPITERATOR_HPP

#define SHARE_GC_Z_ZHEAPITERATOR_HPP

#include "gc/z/zGranuleMap.hpp"

#include "memory/allocation.hpp"

#include "utilities/stack.hpp"

class ObjectClosure;

class ZHeapIteratorBitMap;

class ZHeapIterator : public StackObj {

  template<bool Concurrent, bool Weak> friend class ZHeapIteratorRootOopClosure;

  template<bool VisitReferents> friend class ZHeapIteratorOopClosure;

private:

  typedef ZGranuleMap<ZHeapIteratorBitMap*>         ZVisitMap;

  typedef ZGranuleMapIterator<ZHeapIteratorBitMap*> ZVisitMapIterator;

  typedef Stack<oop, mtGC>                          ZVisitStack;

  ZVisitStack _visit_stack;

  ZVisitMap   _visit_map;

  ZHeapIteratorBitMap* object_map(oop obj);

  void push(oop obj);

  template <typename RootsIterator, bool Concurrent, bool Weak> void push_roots();

  template <bool VisitReferents> void push_fields(oop obj);

  template <bool VisitReferents> void objects_do(ObjectClosure* cl);

public:

  ZHeapIterator();

  ~ZHeapIterator();

};

#endif // SHARE_GC_Z_ZHEAPITERATOR_HPP