Merge branch 'llvm18'

Upgrades the LLVM, Clang, and LLD dependencies to LLVM 18.x

Related to #16270

1 files changed, 404 insertions, 377 deletions

diff --git a/lib/libcxx/include/codecvt b/lib/libcxx/include/codecvt
index ef22bf0530..504dd71f30 100644
--- a/lib/libcxx/include/codecvt
+++ b/lib/libcxx/include/codecvt
@@ -63,496 +63,522 @@ class codecvt_utf8_utf16
 #  pragma GCC system_header
 #endif
 
+#if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode
-{
-    consume_header = 4,
-    generate_header = 2,
-    little_endian = 1
-};
+enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 };
 
 // codecvt_utf8
 
-template <class _Elem> class __codecvt_utf8;
+template <class _Elem>
+class __codecvt_utf8;
 
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<wchar_t>
-    : public codecvt<wchar_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    codecvt_mode __mode_;
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  codecvt_mode __mode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
+
 public:
-    typedef wchar_t   intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
+  typedef wchar_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
-    result do_out(state_type& __st,
-                  const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                  extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-    result do_in(state_type& __st,
-                 const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                 intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-    result do_unshift(state_type& __st,
-                      extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-    int do_encoding() const _NOEXCEPT override;
-    bool do_always_noconv() const _NOEXCEPT override;
-    int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-    int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
-#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char16_t>
-    : public codecvt<char16_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char16_t> : public codecvt<char16_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char16_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char16_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char32_t>
-    : public codecvt<char32_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<char32_t> : public codecvt<char32_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char32_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char32_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff,
-          codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8
-    : public __codecvt_utf8<_Elem>
-{
+template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8 : public __codecvt_utf8<_Elem> {
 public:
-    _LIBCPP_INLINE_VISIBILITY
-    explicit codecvt_utf8(size_t __refs = 0)
-        : __codecvt_utf8<_Elem>(__refs, _Maxcode, _Mode) {}
+  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8(size_t __refs = 0) : __codecvt_utf8<_Elem>(__refs, _Maxcode, _Mode) {}
 
-    _LIBCPP_INLINE_VISIBILITY
-    ~codecvt_utf8() {}
+  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8() {}
 };
 _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // codecvt_utf16
 
-template <class _Elem, bool _LittleEndian> class __codecvt_utf16;
+template <class _Elem, bool _LittleEndian>
+class __codecvt_utf16;
 
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, false>
-    : public codecvt<wchar_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    codecvt_mode __mode_;
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, false> : public codecvt<wchar_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  codecvt_mode __mode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
+
 public:
-    typedef wchar_t   intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
+  typedef wchar_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
-                          size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, true>
-    : public codecvt<wchar_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    codecvt_mode __mode_;
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, true> : public codecvt<wchar_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  codecvt_mode __mode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
+
 public:
-    typedef wchar_t   intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
+  typedef wchar_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
-#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, false>
-    : public codecvt<char16_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, false> : public codecvt<char16_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char16_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char16_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, true>
-    : public codecvt<char16_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char16_t, true> : public codecvt<char16_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char16_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char16_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, false>
-    : public codecvt<char32_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, false> : public codecvt<char32_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char32_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char32_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, true>
-    : public codecvt<char32_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<char32_t, true> : public codecvt<char32_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char32_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char32_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff,
-          codecvt_mode _Mode = (codecvt_mode)0>
+template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf16
-    : public __codecvt_utf16<_Elem, _Mode & little_endian>
-{
+    : public __codecvt_utf16<_Elem, _Mode & little_endian> {
 public:
-    _LIBCPP_INLINE_VISIBILITY
-    explicit codecvt_utf16(size_t __refs = 0)
-        : __codecvt_utf16<_Elem, _Mode & little_endian>(__refs, _Maxcode, _Mode) {}
+  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf16(size_t __refs = 0)
+      : __codecvt_utf16<_Elem, _Mode & little_endian>(__refs, _Maxcode, _Mode) {}
 
-    _LIBCPP_INLINE_VISIBILITY
-    ~codecvt_utf16() {}
+  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf16() {}
 };
 _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // codecvt_utf8_utf16
 
-template <class _Elem> class __codecvt_utf8_utf16;
+template <class _Elem>
+class __codecvt_utf8_utf16;
 
-#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<wchar_t>
-    : public codecvt<wchar_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    codecvt_mode __mode_;
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  codecvt_mode __mode_;
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
+
 public:
-    typedef wchar_t   intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
+  typedef wchar_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_SUPPRESS_DEPRECATED_PUSH
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
-_LIBCPP_SUPPRESS_DEPRECATED_PUSH
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<wchar_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
-#endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
+#  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char32_t>
-    : public codecvt<char32_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char32_t> : public codecvt<char32_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char32_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char32_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char32_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <>
-class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char16_t>
-    : public codecvt<char16_t, char, mbstate_t>
-{
-    unsigned long __maxcode_;
-    codecvt_mode __mode_;
+class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<char16_t> : public codecvt<char16_t, char, mbstate_t> {
+  unsigned long __maxcode_;
+  codecvt_mode __mode_;
+
 public:
-    typedef char16_t  intern_type;
-    typedef char      extern_type;
-    typedef mbstate_t state_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode,
-                            codecvt_mode __mode)
-        : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode),
-          __mode_(__mode) {}
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  typedef char16_t intern_type;
+  typedef char extern_type;
+  typedef mbstate_t state_type;
+
+  _LIBCPP_HIDE_FROM_ABI explicit __codecvt_utf8_utf16(size_t __refs, unsigned long __maxcode, codecvt_mode __mode)
+      : codecvt<char16_t, char, mbstate_t>(__refs), __maxcode_(__maxcode), __mode_(__mode) {}
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 protected:
-     result do_out(state_type& __st,
-                   const intern_type* __frm, const intern_type* __frm_end, const intern_type*& __frm_nxt,
-                   extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     result do_in(state_type& __st,
-                  const extern_type* __frm, const extern_type* __frm_end, const extern_type*& __frm_nxt,
-                  intern_type* __to, intern_type* __to_end, intern_type*& __to_nxt) const override;
-     result do_unshift(state_type& __st,
-                       extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
-     int do_encoding() const _NOEXCEPT override;
-     bool do_always_noconv() const _NOEXCEPT override;
-     int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
-     int do_max_length() const _NOEXCEPT override;
+  result do_out(state_type& __st,
+                const intern_type* __frm,
+                const intern_type* __frm_end,
+                const intern_type*& __frm_nxt,
+                extern_type* __to,
+                extern_type* __to_end,
+                extern_type*& __to_nxt) const override;
+  result do_in(state_type& __st,
+               const extern_type* __frm,
+               const extern_type* __frm_end,
+               const extern_type*& __frm_nxt,
+               intern_type* __to,
+               intern_type* __to_end,
+               intern_type*& __to_nxt) const override;
+  result do_unshift(state_type& __st, extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const override;
+  int do_encoding() const _NOEXCEPT override;
+  bool do_always_noconv() const _NOEXCEPT override;
+  int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
+  int do_max_length() const _NOEXCEPT override;
 };
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template <class _Elem, unsigned long _Maxcode = 0x10ffff,
-          codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8_utf16
-    : public __codecvt_utf8_utf16<_Elem>
-{
+template <class _Elem, unsigned long _Maxcode = 0x10ffff, codecvt_mode _Mode = (codecvt_mode)0>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8_utf16 : public __codecvt_utf8_utf16<_Elem> {
 public:
-    _LIBCPP_INLINE_VISIBILITY
-    explicit codecvt_utf8_utf16(size_t __refs = 0)
-        : __codecvt_utf8_utf16<_Elem>(__refs, _Maxcode, _Mode) {}
+  _LIBCPP_HIDE_FROM_ABI explicit codecvt_utf8_utf16(size_t __refs = 0)
+      : __codecvt_utf8_utf16<_Elem>(__refs, _Maxcode, _Mode) {}
 
-    _LIBCPP_INLINE_VISIBILITY
-    ~codecvt_utf8_utf16() {}
+  _LIBCPP_HIDE_FROM_ABI ~codecvt_utf8_utf16() {}
 };
 _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 _LIBCPP_END_NAMESPACE_STD
 
+#endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <atomic>
 #  include <concepts>
@@ -562,6 +588,7 @@ _LIBCPP_END_NAMESPACE_STD
 #  include <initializer_list>
 #  include <iosfwd>
 #  include <limits>
+#  include <mutex>
 #  include <new>
 #  include <stdexcept>
 #  include <type_traits>