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[libc++][RFC] Refactor attributes to [[attribute_macro]] #130099

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[libc++][RFC] Refactor attributes to [[attribute_macro]] #130099

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7 changes: 0 additions & 7 deletions libcxx/.clang-format
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Expand Up @@ -24,12 +24,6 @@ AttributeMacros: [
'_LIBCPP_CONSTEXPR_SINCE_CXX23',
'_LIBCPP_CONSTEXPR',
'_LIBCPP_CONSTINIT',
'_LIBCPP_DEPRECATED_IN_CXX11',
'_LIBCPP_DEPRECATED_IN_CXX14',
'_LIBCPP_DEPRECATED_IN_CXX17',
'_LIBCPP_DEPRECATED_IN_CXX20',
'_LIBCPP_DEPRECATED_IN_CXX23',
'_LIBCPP_DEPRECATED',
'_LIBCPP_DISABLE_EXTENSION_WARNING',
'_LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION',
'_LIBCPP_EXPORTED_FROM_ABI',
Expand All @@ -45,7 +39,6 @@ AttributeMacros: [
'_LIBCPP_OVERRIDABLE_FUNC_VIS',
'_LIBCPP_STANDALONE_DEBUG',
'_LIBCPP_TEMPLATE_DATA_VIS',
'_LIBCPP_TEMPLATE_VIS',
'_LIBCPP_THREAD_SAFETY_ANNOTATION',
'_LIBCPP_USING_IF_EXISTS',
'_LIBCPP_WEAK',
Expand Down
4 changes: 2 additions & 2 deletions libcxx/docs/DesignDocs/VisibilityMacros.rst
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Expand Up @@ -64,7 +64,7 @@ Visibility Macros
ABI, we should create a new _LIBCPP_HIDE_FROM_ABI_AFTER_XXX macro, and we can
use it to start removing symbols from the ABI after that stable version.

**_LIBCPP_TEMPLATE_VIS**
**__libcpp_template_vis**
Mark a type's typeinfo and vtable as having default visibility.
This macro has no effect on the visibility of the type's member functions.

Expand All @@ -80,7 +80,7 @@ Visibility Macros
an extern template declaration as being exported by the libc++ library.
This attribute must be specified on all extern class template declarations.

This macro is used to override the `_LIBCPP_TEMPLATE_VIS` attribute
This macro is used to override the `__libcpp_template_vis` attribute
specified on the primary template and to export the member functions produced
by the explicit instantiation in the dylib.

Expand Down
4 changes: 2 additions & 2 deletions libcxx/include/__algorithm/shuffle.h
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Expand Up @@ -92,7 +92,7 @@ class _LIBCPP_EXPORTED_FROM_ABI __rs_default {
_LIBCPP_EXPORTED_FROM_ABI __rs_default __rs_get();

template <class _RandomAccessIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX14 void
_LIBCPP_HIDE_FROM_ABI [[__libcpp_deprecated_in_cxx14("std::shuffle should be used instead")]] void
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last) {
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
typedef uniform_int_distribution<ptrdiff_t> _Dp;
Expand All @@ -110,7 +110,7 @@ random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last) {
}

template <class _RandomAccessIterator, class _RandomNumberGenerator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX14 void
_LIBCPP_HIDE_FROM_ABI [[__libcpp_deprecated_in_cxx14("std::shuffle should be used instead")]] void
random_shuffle(_RandomAccessIterator __first,
_RandomAccessIterator __last,
# ifndef _LIBCPP_CXX03_LANG
Expand Down
4 changes: 2 additions & 2 deletions libcxx/include/__atomic/atomic.h
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Expand Up @@ -467,13 +467,13 @@ _LIBCPP_HIDE_FROM_ABI bool atomic_is_lock_free(const atomic<_Tp>* __o) _NOEXCEPT
// atomic_init

template <class _Tp>
_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void
[[__libcpp_deprecated_in_cxx20()]] _LIBCPP_HIDE_FROM_ABI void
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@mordante mordante Mar 11, 2025

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Are the empty parenthesis required?

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@philnik777 philnik777 Mar 11, 2025

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They are required if we want to be able to add a message. I think it'd be better this way to encourage people to add a message, but it's not required for the main change. If that's the hangup I can revert these changes.

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@mordante mordante Mar 17, 2025

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I think it's good to be able to provide a message. However there is not always a replacement in the Standard. So I rather have two macros one for that provides a message and one that doesn't. That avoids the () which looks bad to me.

atomic_init(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
}

template <class _Tp>
_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void
[[__libcpp_deprecated_in_cxx20()]] _LIBCPP_HIDE_FROM_ABI void
atomic_init(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
}
Expand Down
10 changes: 5 additions & 5 deletions libcxx/include/__chrono/duration.h
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Expand Up @@ -32,7 +32,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
namespace chrono {

template <class _Rep, class _Period = ratio<1> >
class _LIBCPP_TEMPLATE_VIS duration;
class [[__libcpp_template_vis]] duration;

template <class _Tp>
inline const bool __is_duration_v = false;
Expand All @@ -52,7 +52,7 @@ inline const bool __is_duration_v<const volatile duration<_Rep, _Period> > = tru
} // namespace chrono

template <class _Rep1, class _Period1, class _Rep2, class _Period2>
struct _LIBCPP_TEMPLATE_VIS common_type<chrono::duration<_Rep1, _Period1>, chrono::duration<_Rep2, _Period2> > {
struct [[__libcpp_template_vis]] common_type<chrono::duration<_Rep1, _Period1>, chrono::duration<_Rep2, _Period2> > {
typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type, __ratio_gcd<_Period1, _Period2> > type;
};

Expand Down Expand Up @@ -107,15 +107,15 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration duration_cast(const d
}

template <class _Rep>
struct _LIBCPP_TEMPLATE_VIS treat_as_floating_point : is_floating_point<_Rep> {};
struct [[__libcpp_template_vis]] treat_as_floating_point : is_floating_point<_Rep> {};

#if _LIBCPP_STD_VER >= 17
template <class _Rep>
inline constexpr bool treat_as_floating_point_v = treat_as_floating_point<_Rep>::value;
#endif

template <class _Rep>
struct _LIBCPP_TEMPLATE_VIS duration_values {
struct [[__libcpp_template_vis]] duration_values {
public:
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _Rep zero() _NOEXCEPT { return _Rep(0); }
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR _Rep max() _NOEXCEPT { return numeric_limits<_Rep>::max(); }
Expand Down Expand Up @@ -156,7 +156,7 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ToDuration round(const duration<
// duration

template <class _Rep, class _Period>
class _LIBCPP_TEMPLATE_VIS duration {
class [[__libcpp_template_vis]] duration {
static_assert(!__is_duration_v<_Rep>, "A duration representation can not be a duration");
static_assert(__is_ratio_v<_Period>, "Second template parameter of duration must be a std::ratio");
static_assert(_Period::num > 0, "duration period must be positive");
Expand Down
45 changes: 23 additions & 22 deletions libcxx/include/__chrono/formatter.h
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Expand Up @@ -698,7 +698,7 @@ __format_chrono(const _Tp& __value,
} // namespace __formatter

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS __formatter_chrono {
struct [[__libcpp_template_vis]] __formatter_chrono {
public:
template <class _ParseContext>
_LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator
Expand All @@ -716,7 +716,7 @@ struct _LIBCPP_TEMPLATE_VIS __formatter_chrono {
};

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::sys_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::sys_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -730,7 +730,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::sys_time<_Duration>, _CharT> : pub
# if _LIBCPP_HAS_EXPERIMENTAL_TZDB

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::utc_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::utc_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -741,7 +741,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::utc_time<_Duration>, _CharT> : pub
};

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::tai_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::tai_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -752,7 +752,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::tai_time<_Duration>, _CharT> : pub
};

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::gps_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::gps_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -766,7 +766,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::gps_time<_Duration>, _CharT> : pub
# endif // _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::file_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::file_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -777,7 +777,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::file_time<_Duration>, _CharT> : pu
};

template <class _Duration, __fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::local_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::local_time<_Duration>, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand Down Expand Up @@ -811,7 +811,7 @@ struct formatter<chrono::duration<_Rep, _Period>, _CharT> : public __formatter_c
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::day, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::day, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -822,7 +822,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::day, _CharT> : public __formatter_
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::month, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -833,7 +833,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month, _CharT> : public __formatte
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::year, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -844,7 +844,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year, _CharT> : public __formatter
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::weekday, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -855,7 +855,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday, _CharT> : public __format
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_indexed, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::weekday_indexed, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -866,7 +866,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_indexed, _CharT> : public
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_last, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::weekday_last, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -877,7 +877,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_last, _CharT> : public __f
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::month_day, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -888,7 +888,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day, _CharT> : public __form
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day_last, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::month_day_last, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -899,7 +899,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day_last, _CharT> : public _
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::month_weekday, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -910,7 +910,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday, _CharT> : public __
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday_last, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::month_weekday_last, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -921,7 +921,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday_last, _CharT> : publ
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::year_month, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -932,7 +932,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month, _CharT> : public __for
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::year_month_day, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -943,7 +943,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day, _CharT> : public _
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day_last, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::year_month_day_last, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -954,7 +954,7 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day_last, _CharT> : pub
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]] formatter<chrono::year_month_weekday, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand All @@ -965,7 +965,8 @@ struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday, _CharT> : publ
};

template <__fmt_char_type _CharT>
struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday_last, _CharT> : public __formatter_chrono<_CharT> {
struct [[__libcpp_template_vis]]
formatter<chrono::year_month_weekday_last, _CharT> : public __formatter_chrono<_CharT> {
public:
using _Base _LIBCPP_NODEBUG = __formatter_chrono<_CharT>;

Expand Down
2 changes: 1 addition & 1 deletion libcxx/include/__chrono/parser_std_format_spec.h
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Expand Up @@ -139,7 +139,7 @@ _LIBCPP_HIDE_FROM_ABI constexpr void __validate_time_zone(__flags __flags) {
}

template <class _CharT>
class _LIBCPP_TEMPLATE_VIS __parser_chrono {
class [[__libcpp_template_vis]] __parser_chrono {
using _ConstIterator _LIBCPP_NODEBUG = typename basic_format_parse_context<_CharT>::const_iterator;

public:
Expand Down
4 changes: 2 additions & 2 deletions libcxx/include/__chrono/time_point.h
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Expand Up @@ -31,7 +31,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
namespace chrono {

template <class _Clock, class _Duration = typename _Clock::duration>
class _LIBCPP_TEMPLATE_VIS time_point {
class [[__libcpp_template_vis]] time_point {
static_assert(__is_duration_v<_Duration>, "Second template parameter of time_point must be a std::chrono::duration");

public:
Expand Down Expand Up @@ -76,7 +76,7 @@ class _LIBCPP_TEMPLATE_VIS time_point {
} // namespace chrono

template <class _Clock, class _Duration1, class _Duration2>
struct _LIBCPP_TEMPLATE_VIS
struct [[__libcpp_template_vis]]
common_type<chrono::time_point<_Clock, _Duration1>, chrono::time_point<_Clock, _Duration2> > {
typedef chrono::time_point<_Clock, typename common_type<_Duration1, _Duration2>::type> type;
};
Expand Down
2 changes: 1 addition & 1 deletion libcxx/include/__compare/common_comparison_category.h
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Expand Up @@ -72,7 +72,7 @@ _LIBCPP_HIDE_FROM_ABI constexpr auto __get_comp_type() {

// [cmp.common], common comparison category type
template <class... _Ts>
struct _LIBCPP_TEMPLATE_VIS common_comparison_category {
struct [[__libcpp_template_vis]] common_comparison_category {
using type = decltype(__comp_detail::__get_comp_type<_Ts...>());
};

Expand Down
2 changes: 1 addition & 1 deletion libcxx/include/__compare/compare_three_way.h
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Expand Up @@ -22,7 +22,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

struct _LIBCPP_TEMPLATE_VIS compare_three_way {
struct [[__libcpp_template_vis]] compare_three_way {
template <class _T1, class _T2>
requires three_way_comparable_with<_T1, _T2>
constexpr _LIBCPP_HIDE_FROM_ABI auto operator()(_T1&& __t, _T2&& __u) const
Expand Down
2 changes: 1 addition & 1 deletion libcxx/include/__compare/compare_three_way_result.h
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Expand Up @@ -33,7 +33,7 @@ struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result<
};

template <class _Tp, class _Up = _Tp>
struct _LIBCPP_TEMPLATE_VIS _LIBCPP_NO_SPECIALIZATIONS compare_three_way_result
struct [[__libcpp_template_vis]] _LIBCPP_NO_SPECIALIZATIONS compare_three_way_result
: __compare_three_way_result<_Tp, _Up, void> {};

template <class _Tp, class _Up = _Tp>
Expand Down
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