/*
 * 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
 * questions.
 *
 */

#ifndef SHARE_VM_UTILITIES_TRAITS_INTEGER_HPP
#define SHARE_VM_UTILITIES_TRAITS_INTEGER_HPP

#include "memory/allocation.hpp"

namespace IntegerTypeImpl {
  template <size_t size>
  struct SignedType: AllStatic {};

  template <>
  struct SignedType<sizeof(int64_t)>: AllStatic {
    typedef int64_t type;
  };

  template <>
  struct SignedType<sizeof(int32_t)>: AllStatic {
    typedef int32_t type;
  };

  template <>
  struct SignedType<sizeof(int16_t)>: AllStatic {
    typedef int16_t type;
  };

  template <>
  struct SignedType<sizeof(int8_t)>: AllStatic {
    typedef signed char type;
  };

  template <size_t size>
  struct UnsignedType: AllStatic {};

  template <>
  struct UnsignedType<sizeof(uint64_t)>: AllStatic {
    typedef uint64_t type;
  };

  template <>
  struct UnsignedType<sizeof(uint32_t)>: AllStatic {
    typedef uint32_t type;
  };

  template <>
  struct UnsignedType<sizeof(uint16_t)>: AllStatic {
    typedef uint16_t type;
  };

  template <>
  struct UnsignedType<sizeof(uint8_t)>: AllStatic {
    typedef unsigned char type;
  };
}

template <typename T>
struct IsPointerSize: AllStatic {
  enum {
    value = sizeof(T) == sizeof(void*)
  };
};

template <typename T>
struct IntegerType: AllStatic {
  typedef typename IntegerTypeImpl::SignedType<sizeof(T)>::type signed_type;
  typedef typename IntegerTypeImpl::UnsignedType<sizeof(T)>::type unsigned_type;

  static signed_type cast_to_signed(T val) {
    return *(signed_type*)&val;
  }

  static T cast_from_signed(signed_type val) {
    return *(T*)&val;
  }

  static unsigned_type cast_to_unsigned(T val) {
    return *(unsigned_type*)&val;
  }

  static T cast_from_unsigned(unsigned_type val) {
    return *(T*)&val;
  }
};

#endif // SHARE_VM_UTILITIES_TRAITS_INTEGER_HPP