/*

 * 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.

 *

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#ifndef SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP

#define SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP

#include "memory/allocation.hpp"

#include "oops/access.hpp"

class AccessBarrierSupport: AllStatic {

private:

  static DecoratorSet resolve_unknown_oop_ref_strength(DecoratorSet decorators, oop base, ptrdiff_t offset);

public:

  // Some collectors, like G1, needs to keep referents alive when loading them.

  // Therefore, for APIs that accept unknown oop ref strength (e.g. unsafe),

  // we need to dynamically find out if a given field is on a java.lang.ref.Reference object.

  // and in that case what strength it has.

  template<DecoratorSet decorators>

  static DecoratorSet resolve_possibly_unknown_oop_ref_strength(oop base, ptrdiff_t offset);

};

#endif // SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP