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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___TYPE_TRAITS_ALIGNED_STORAGE_H
#define _LIBCPP___TYPE_TRAITS_ALIGNED_STORAGE_H
#include <__config>
#include <__type_traits/conditional.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/nat.h>
#include <__type_traits/type_list.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
struct __align_type {
static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp);
typedef _Tp type;
};
struct __struct_double {
long double __lx;
};
struct __struct_double4 {
double __lx[4];
};
// clang-format off
typedef __type_list<__align_type<unsigned char>,
__type_list<__align_type<unsigned short>,
__type_list<__align_type<unsigned int>,
__type_list<__align_type<unsigned long>,
__type_list<__align_type<unsigned long long>,
__type_list<__align_type<double>,
__type_list<__align_type<long double>,
__type_list<__align_type<__struct_double>,
__type_list<__align_type<__struct_double4>,
__type_list<__align_type<int*>,
__nat
> > > > > > > > > > __all_types;
// clang-format on
template <size_t _Align>
struct _ALIGNAS(_Align) __fallback_overaligned {};
template <class _TL, size_t _Align>
struct __find_pod;
template <class _Hp, size_t _Align>
struct __find_pod<__type_list<_Hp, __nat>, _Align> {
typedef __conditional_t<_Align == _Hp::value, typename _Hp::type, __fallback_overaligned<_Align> > type;
};
template <class _Hp, class _Tp, size_t _Align>
struct __find_pod<__type_list<_Hp, _Tp>, _Align> {
typedef __conditional_t<_Align == _Hp::value, typename _Hp::type, typename __find_pod<_Tp, _Align>::type> type;
};
template <class _TL, size_t _Len>
struct __find_max_align;
template <class _Hp, size_t _Len>
struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {};
template <size_t _Len, size_t _A1, size_t _A2>
struct __select_align {
private:
static const size_t __min = _A2 < _A1 ? _A2 : _A1;
static const size_t __max = _A1 < _A2 ? _A2 : _A1;
public:
static const size_t value = _Len < __max ? __min : __max;
};
template <class _Hp, class _Tp, size_t _Len>
struct __find_max_align<__type_list<_Hp, _Tp>, _Len>
: public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {};
template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage {
typedef typename __find_pod<__all_types, _Align>::type _Aligner;
union type {
_Aligner __align;
unsigned char __data[(_Len + _Align - 1) / _Align * _Align];
};
};
#if _LIBCPP_STD_VER >= 14
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value>
using aligned_storage_t _LIBCPP_DEPRECATED_IN_CXX23 = typename aligned_storage<_Len, _Align>::type;
_LIBCPP_SUPPRESS_DEPRECATED_POP
#endif
#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \
template <size_t _Len> \
struct _LIBCPP_DEPRECATED_IN_CXX23 _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n> { \
struct _ALIGNAS(n) type { \
unsigned char __lx[(_Len + n - 1) / n * n]; \
}; \
}
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000);
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000);
// PE/COFF does not support alignment beyond 8192 (=0x2000)
#if !defined(_LIBCPP_OBJECT_FORMAT_COFF)
_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000);
#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF)
#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TYPE_TRAITS_ALIGNED_STORAGE_H
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