/*

 * 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_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP

#define SHARE_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP

#include "oops/oop.inline.hpp"

class UnifiedOop : public AllStatic {

 public:

  static const bool is_narrow(const oop* ref) {

    assert(ref != NULL, "invariant");

    return 1 == (((u8)ref) & 1);

  }

  static const oop* decode(const oop* ref) {

    assert(ref != NULL, "invariant");

    return is_narrow(ref) ? (const oop*)(((u8)ref) & ~1) : ref;

  }

  static const oop* encode(narrowOop* ref) {

    assert(ref != NULL, "invariant");

    return (const oop*)((u8)ref | 1);

  }

  static oop dereference(const oop* ref) {

    assert(ref != NULL, "invariant");

    return is_narrow(ref) ?

      (oop)RawAccess<>::oop_load((narrowOop*)decode(ref)) :

      (oop)RawAccess<>::oop_load(const_cast<oop*>(ref));

  }

};

#endif // SHARE_JFR_LEAKPROFILER_UTILITIES_UNIFIEDOOP_HPP