[libc++] Put _LIBCPP_NODEBUG on all internal aliases (#118710)

This significantly reduces the amount of debug information generated
for codebases using libc++, without hurting the debugging experience.

Author: philnik777

libcxx/include/__algorithm/comp_ref_type.h

@@ -56,10 +56,10 @@ struct __debug_less {
 // Pass the comparator by lvalue reference. Or in the debug mode, using a debugging wrapper that stores a reference.
 #if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
 template <class _Comp>
-using __comp_ref_type = __debug_less<_Comp>;
+using __comp_ref_type _LIBCPP_NODEBUG = __debug_less<_Comp>;
 #else
 template <class _Comp>
-using __comp_ref_type = _Comp&;
+using __comp_ref_type _LIBCPP_NODEBUG = _Comp&;
 #endif
 
 _LIBCPP_END_NAMESPACE_STD

libcxx/include/__algorithm/copy.h

@@ -47,7 +47,7 @@ struct __copy_impl {
 
   template <class _InIter, class _OutIter>
   struct _CopySegment {
-    using _Traits = __segmented_iterator_traits<_InIter>;
+    using _Traits _LIBCPP_NODEBUG = __segmented_iterator_traits<_InIter>;
 
     _OutIter& __result_;
 

libcxx/include/__algorithm/iterator_operations.h

@@ -48,13 +48,13 @@ struct _RangeAlgPolicy {};
 template <>
 struct _IterOps<_RangeAlgPolicy> {
   template <class _Iter>
-  using __value_type = iter_value_t<_Iter>;
+  using __value_type _LIBCPP_NODEBUG = iter_value_t<_Iter>;
 
   template <class _Iter>
-  using __iterator_category = ranges::__iterator_concept<_Iter>;
+  using __iterator_category _LIBCPP_NODEBUG = ranges::__iterator_concept<_Iter>;
 
   template <class _Iter>
-  using __difference_type = iter_difference_t<_Iter>;
+  using __difference_type _LIBCPP_NODEBUG = iter_difference_t<_Iter>;
 
   static constexpr auto advance      = ranges::advance;
   static constexpr auto distance     = ranges::distance;
@@ -72,13 +72,13 @@ struct _ClassicAlgPolicy {};
 template <>
 struct _IterOps<_ClassicAlgPolicy> {
   template <class _Iter>
-  using __value_type = typename iterator_traits<_Iter>::value_type;
+  using __value_type _LIBCPP_NODEBUG = typename iterator_traits<_Iter>::value_type;
 
   template <class _Iter>
-  using __iterator_category = typename iterator_traits<_Iter>::iterator_category;
+  using __iterator_category _LIBCPP_NODEBUG = typename iterator_traits<_Iter>::iterator_category;
 
   template <class _Iter>
-  using __difference_type = typename iterator_traits<_Iter>::difference_type;
+  using __difference_type _LIBCPP_NODEBUG = typename iterator_traits<_Iter>::difference_type;
 
   // advance
   template <class _Iter, class _Distance>
@@ -94,10 +94,10 @@ struct _IterOps<_ClassicAlgPolicy> {
   }
 
   template <class _Iter>
-  using __deref_t = decltype(*std::declval<_Iter&>());
+  using __deref_t _LIBCPP_NODEBUG = decltype(*std::declval<_Iter&>());
 
   template <class _Iter>
-  using __move_t = decltype(std::move(*std::declval<_Iter&>()));
+  using __move_t _LIBCPP_NODEBUG = decltype(std::move(*std::declval<_Iter&>()));
 
   template <class _Iter>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static void __validate_iter_reference() {
@@ -217,7 +217,7 @@ struct _IterOps<_ClassicAlgPolicy> {
 };
 
 template <class _AlgPolicy, class _Iter>
-using __policy_iter_diff_t = typename _IterOps<_AlgPolicy>::template __difference_type<_Iter>;
+using __policy_iter_diff_t _LIBCPP_NODEBUG = typename _IterOps<_AlgPolicy>::template __difference_type<_Iter>;
 
 _LIBCPP_END_NAMESPACE_STD
 

libcxx/include/__algorithm/move.h

@@ -50,7 +50,7 @@ struct __move_impl {
 
   template <class _InIter, class _OutIter>
   struct _MoveSegment {
-    using _Traits = __segmented_iterator_traits<_InIter>;
+    using _Traits _LIBCPP_NODEBUG = __segmented_iterator_traits<_InIter>;
 
     _OutIter& __result_;
 

libcxx/include/__algorithm/ranges_iterator_concept.h

@@ -44,7 +44,7 @@ consteval auto __get_iterator_concept() {
 }
 
 template <class _Iter>
-using __iterator_concept = decltype(__get_iterator_concept<_Iter>());
+using __iterator_concept _LIBCPP_NODEBUG = decltype(__get_iterator_concept<_Iter>());
 
 } // namespace ranges
 _LIBCPP_END_NAMESPACE_STD

libcxx/include/__algorithm/ranges_unique_copy.h

@@ -60,7 +60,7 @@ struct __unique_copy {
   }
 
   template <class _InIter, class _OutIter>
-  using __algo_tag_t = decltype(__get_algo_tag<_InIter, _OutIter>());
+  using __algo_tag_t _LIBCPP_NODEBUG = decltype(__get_algo_tag<_InIter, _OutIter>());
 
   template <input_iterator _InIter,
             sentinel_for<_InIter> _Sent,

libcxx/include/__algorithm/simd_utils.h

@@ -70,7 +70,7 @@ struct __get_as_integer_type_impl<8> {
 };
 
 template <class _Tp>
-using __get_as_integer_type_t = typename __get_as_integer_type_impl<sizeof(_Tp)>::type;
+using __get_as_integer_type_t _LIBCPP_NODEBUG = typename __get_as_integer_type_impl<sizeof(_Tp)>::type;
 
 // This isn't specialized for 64 byte vectors on purpose. They have the potential to significantly reduce performance
 // in mixed simd/non-simd workloads and don't provide any performance improvement for currently vectorized algorithms
@@ -90,7 +90,7 @@ inline constexpr size_t __native_vector_size = 1;
 #  endif
 
 template <class _ArithmeticT, size_t _Np>
-using __simd_vector __attribute__((__ext_vector_type__(_Np))) = _ArithmeticT;
+using __simd_vector __attribute__((__ext_vector_type__(_Np))) _LIBCPP_NODEBUG = _ArithmeticT;
 
 template <class _VecT>
 inline constexpr size_t __simd_vector_size_v = []<bool _False = false>() -> size_t {
@@ -106,7 +106,7 @@ _LIBCPP_HIDE_FROM_ABI _Tp __simd_vector_underlying_type_impl(__simd_vector<_Tp,
 }
 
 template <class _VecT>
-using __simd_vector_underlying_type_t = decltype(std::__simd_vector_underlying_type_impl(_VecT{}));
+using __simd_vector_underlying_type_t _LIBCPP_NODEBUG = decltype(std::__simd_vector_underlying_type_impl(_VecT{}));
 
 // This isn't inlined without always_inline when loading chars.
 template <class _VecT, class _Iter>

libcxx/include/__algorithm/sort.h

@@ -890,10 +890,10 @@ __sort_dispatch(_RandomAccessIterator __first, _RandomAccessIterator __last, _Co
 }
 
 template <class _Type, class... _Options>
-using __is_any_of = _Or<is_same<_Type, _Options>...>;
+using __is_any_of _LIBCPP_NODEBUG = _Or<is_same<_Type, _Options>...>;
 
 template <class _Type>
-using __sort_is_specialized_in_library = __is_any_of<
+using __sort_is_specialized_in_library _LIBCPP_NODEBUG = __is_any_of<
     _Type,
     char,
 #if _LIBCPP_HAS_WIDE_CHARACTERS

libcxx/include/__algorithm/three_way_comp_ref_type.h

@@ -61,10 +61,10 @@ struct __debug_three_way_comp {
 // Pass the comparator by lvalue reference. Or in the debug mode, using a debugging wrapper that stores a reference.
 #  if _LIBCPP_HARDENING_MODE == _LIBCPP_HARDENING_MODE_DEBUG
 template <class _Comp>
-using __three_way_comp_ref_type = __debug_three_way_comp<_Comp>;
+using __three_way_comp_ref_type _LIBCPP_NODEBUG = __debug_three_way_comp<_Comp>;
 #  else
 template <class _Comp>
-using __three_way_comp_ref_type = _Comp&;
+using __three_way_comp_ref_type _LIBCPP_NODEBUG = _Comp&;
 #  endif
 
 #endif // _LIBCPP_STD_VER >= 20

libcxx/include/__algorithm/unwrap_iter.h

@@ -46,7 +46,7 @@ struct __unwrap_iter_impl {
 // It's a contiguous iterator, so we can use a raw pointer instead
 template <class _Iter>
 struct __unwrap_iter_impl<_Iter, true> {
-  using _ToAddressT = decltype(std::__to_address(std::declval<_Iter>()));
+  using _ToAddressT _LIBCPP_NODEBUG = decltype(std::__to_address(std::declval<_Iter>()));
 
   static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap(_Iter __orig_iter, _ToAddressT __unwrapped_iter) {
     return __orig_iter + (__unwrapped_iter - std::__to_address(__orig_iter));