[libcxx-commits] [libcxx] 748023d - [libc++][NFC] Replace _LIBCPP_NORETURN and TEST_NORETURN with [[noreturn]] (#80455)

via libcxx-commits libcxx-commits at lists.llvm.org
Tue Sep 10 23:59:49 PDT 2024


Author: Nikolas Klauser
Date: 2024-09-11T08:59:46+02:00
New Revision: 748023dc3210533df2c1c6efc8af1b5954493701

URL: https://github.com/llvm/llvm-project/commit/748023dc3210533df2c1c6efc8af1b5954493701
DIFF: https://github.com/llvm/llvm-project/commit/748023dc3210533df2c1c6efc8af1b5954493701.diff

LOG: [libc++][NFC] Replace _LIBCPP_NORETURN and TEST_NORETURN with [[noreturn]] (#80455)

`[[__noreturn__]]` is now always available, so we can simply use the
attribute directly instead of through a macro.

Added: 
    

Modified: 
    libcxx/.clang-format
    libcxx/include/__chrono/exception.h
    libcxx/include/__config
    libcxx/include/__exception/exception_ptr.h
    libcxx/include/__exception/nested_exception.h
    libcxx/include/__exception/operations.h
    libcxx/include/__exception/terminate.h
    libcxx/include/__filesystem/filesystem_error.h
    libcxx/include/__format/format_error.h
    libcxx/include/__format/parser_std_format_spec.h
    libcxx/include/__functional/function.h
    libcxx/include/__memory/shared_ptr.h
    libcxx/include/__system_error/system_error.h
    libcxx/include/__utility/unreachable.h
    libcxx/include/__verbose_abort
    libcxx/include/any
    libcxx/include/future
    libcxx/include/ios
    libcxx/include/new
    libcxx/include/optional
    libcxx/include/regex
    libcxx/include/stdexcept
    libcxx/include/string
    libcxx/include/typeinfo
    libcxx/include/variant
    libcxx/include/vector
    libcxx/src/stdexcept.cpp
    libcxx/src/string.cpp
    libcxx/src/support/runtime/exception_fallback.ipp
    libcxx/src/support/runtime/exception_msvc.ipp
    libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
    libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
    libcxx/src/support/runtime/exception_pointer_msvc.ipp
    libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
    libcxx/src/vector.cpp
    libcxx/test/support/assert_macros.h
    libcxx/test/support/check_assertion.h
    libcxx/test/support/count_new.h
    libcxx/test/support/test_macros.h

Removed: 
    


################################################################################
diff  --git a/libcxx/.clang-format b/libcxx/.clang-format
index b2ca452931fec5..c37b234e857dea 100644
--- a/libcxx/.clang-format
+++ b/libcxx/.clang-format
@@ -44,7 +44,6 @@ AttributeMacros: [
                   '_LIBCPP_NO_UNIQUE_ADDRESS',
                   '_LIBCPP_NOALIAS',
                   '_LIBCPP_NODISCARD',
-                  '_LIBCPP_NORETURN',
                   '_LIBCPP_OVERRIDABLE_FUNC_VIS',
                   '_LIBCPP_STANDALONE_DEBUG',
                   '_LIBCPP_TEMPLATE_DATA_VIS',

diff  --git a/libcxx/include/__chrono/exception.h b/libcxx/include/__chrono/exception.h
index 266f8fac441760..cc408d78a36da6 100644
--- a/libcxx/include/__chrono/exception.h
+++ b/libcxx/include/__chrono/exception.h
@@ -71,7 +71,7 @@ class nonexistent_local_time : public runtime_error {
 };
 
 template <class _Duration>
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
+[[noreturn]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
     [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
 #    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw nonexistent_local_time(__time, __info);
@@ -115,7 +115,7 @@ class ambiguous_local_time : public runtime_error {
 };
 
 template <class _Duration>
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
+[[noreturn]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
     [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
 #    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw ambiguous_local_time(__time, __info);

diff  --git a/libcxx/include/__config b/libcxx/include/__config
index bccf90d1dbacd2..b0a5dda147a6ae 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -312,7 +312,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) alignas(x)
 #    define _ALIGNAS(x) alignas(x)
-#    define _LIBCPP_NORETURN [[noreturn]]
 #    define _NOEXCEPT noexcept
 #    define _NOEXCEPT_(...) noexcept(__VA_ARGS__)
 #    define _LIBCPP_CONSTEXPR constexpr
@@ -322,7 +321,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 #    define _ALIGNAS(x) __attribute__((__aligned__(x)))
-#    define _LIBCPP_NORETURN __attribute__((__noreturn__))
 #    define _LIBCPP_HAS_NO_NOEXCEPT
 #    define nullptr __nullptr
 #    define _NOEXCEPT throw()

diff  --git a/libcxx/include/__exception/exception_ptr.h b/libcxx/include/__exception/exception_ptr.h
index beadd9212abd10..9e5351f534a1c1 100644
--- a/libcxx/include/__exception/exception_ptr.h
+++ b/libcxx/include/__exception/exception_ptr.h
@@ -159,7 +159,7 @@ _LIBCPP_EXPORTED_FROM_ABI void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
 
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr __copy_exception_ptr(void* __except, const void* __ptr);
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
 
 // This is a built-in template function which automagically extracts the required
 // information.

diff  --git a/libcxx/include/__exception/nested_exception.h b/libcxx/include/__exception/nested_exception.h
index 4c7970d167ffa5..8e817e1c069788 100644
--- a/libcxx/include/__exception/nested_exception.h
+++ b/libcxx/include/__exception/nested_exception.h
@@ -40,7 +40,7 @@ class _LIBCPP_EXPORTED_FROM_ABI nested_exception {
   virtual ~nested_exception() _NOEXCEPT;
 
   // access functions
-  _LIBCPP_NORETURN void rethrow_nested() const;
+  [[__noreturn__]] void rethrow_nested() const;
   _LIBCPP_HIDE_FROM_ABI exception_ptr nested_ptr() const _NOEXCEPT { return __ptr_; }
 };
 
@@ -55,19 +55,19 @@ struct __throw_with_nested;
 
 template <class _Tp, class _Up>
 struct __throw_with_nested<_Tp, _Up, true> {
-  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
+  [[__noreturn__]] static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
     throw __nested<_Up>(std::forward<_Tp>(__t));
   }
 };
 
 template <class _Tp, class _Up>
 struct __throw_with_nested<_Tp, _Up, false> {
-  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
+  [[__noreturn__]] static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
 };
 #endif
 
 template <class _Tp>
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   using _Up = __decay_t<_Tp>;
   static_assert(is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");

diff  --git a/libcxx/include/__exception/operations.h b/libcxx/include/__exception/operations.h
index 4a0a697c00e6e5..c8744eb297a4e8 100644
--- a/libcxx/include/__exception/operations.h
+++ b/libcxx/include/__exception/operations.h
@@ -22,7 +22,7 @@ namespace std { // purposefully not using versioning namespace
 using unexpected_handler = void (*)();
 _LIBCPP_EXPORTED_FROM_ABI unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
 _LIBCPP_EXPORTED_FROM_ABI unexpected_handler get_unexpected() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void unexpected();
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void unexpected();
 #endif
 
 using terminate_handler = void (*)();
@@ -37,7 +37,7 @@ _LIBCPP_EXPORTED_FROM_ABI int uncaught_exceptions() _NOEXCEPT;
 class _LIBCPP_EXPORTED_FROM_ABI exception_ptr;
 
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
 } // namespace std
 
 #endif // _LIBCPP___EXCEPTION_OPERATIONS_H

diff  --git a/libcxx/include/__exception/terminate.h b/libcxx/include/__exception/terminate.h
index e672471dc52631..0bfc3506d37910 100644
--- a/libcxx/include/__exception/terminate.h
+++ b/libcxx/include/__exception/terminate.h
@@ -16,7 +16,7 @@
 #endif
 
 namespace std { // purposefully not using versioning namespace
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void terminate() _NOEXCEPT;
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void terminate() _NOEXCEPT;
 } // namespace std
 
 #endif // _LIBCPP___EXCEPTION_TERMINATE_H

diff  --git a/libcxx/include/__filesystem/filesystem_error.h b/libcxx/include/__filesystem/filesystem_error.h
index 80a11e3b1932c7..f43568c2004d21 100644
--- a/libcxx/include/__filesystem/filesystem_error.h
+++ b/libcxx/include/__filesystem/filesystem_error.h
@@ -69,13 +69,13 @@ class _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_EXPORTED_FROM_ABI filesyst
 
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
 template <class... _Args>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
 __throw_filesystem_error(_Args&&... __args) {
   throw filesystem_error(std::forward<_Args>(__args)...);
 }
 #  else
 template <class... _Args>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
 __throw_filesystem_error(_Args&&...) {
   _LIBCPP_VERBOSE_ABORT("filesystem_error was thrown in -fno-exceptions mode");
 }

diff  --git a/libcxx/include/__format/format_error.h b/libcxx/include/__format/format_error.h
index 35a39ee82f3daf..1df7dbff2b7df2 100644
--- a/libcxx/include/__format/format_error.h
+++ b/libcxx/include/__format/format_error.h
@@ -35,7 +35,7 @@ class _LIBCPP_EXPORTED_FROM_ABI format_error : public runtime_error {
 };
 _LIBCPP_DIAGNOSTIC_POP
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_format_error(const char* __s) {
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI void __throw_format_error(const char* __s) {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw format_error(__s);
 #  else

diff  --git a/libcxx/include/__format/parser_std_format_spec.h b/libcxx/include/__format/parser_std_format_spec.h
index 28891e5d2876cd..6bdf8e319ba44b 100644
--- a/libcxx/include/__format/parser_std_format_spec.h
+++ b/libcxx/include/__format/parser_std_format_spec.h
@@ -52,13 +52,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace __format_spec {
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void
+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void
 __throw_invalid_option_format_error(const char* __id, const char* __option) {
   std::__throw_format_error(
       (string("The format specifier for ") + __id + " does not allow the " + __option + " option").c_str());
 }
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {
+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {
   std::__throw_format_error(
       (string("The type option contains an invalid value for ") + __id + " formatting argument").c_str());
 }

diff  --git a/libcxx/include/__functional/function.h b/libcxx/include/__functional/function.h
index c7b98035e34bfa..ff31011caa329d 100644
--- a/libcxx/include/__functional/function.h
+++ b/libcxx/include/__functional/function.h
@@ -78,7 +78,7 @@ class _LIBCPP_EXPORTED_FROM_ABI bad_function_call : public exception {
 };
 _LIBCPP_DIAGNOSTIC_POP
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_function_call() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_function_call() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_function_call();
 #  else

diff  --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h
index 4dd8022822d223..5dcd475e2c9f9d 100644
--- a/libcxx/include/__memory/shared_ptr.h
+++ b/libcxx/include/__memory/shared_ptr.h
@@ -123,7 +123,7 @@ class _LIBCPP_EXPORTED_FROM_ABI bad_weak_ptr : public std::exception {
   const char* what() const _NOEXCEPT override;
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_weak_ptr() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_weak_ptr() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_weak_ptr();
 #else

diff  --git a/libcxx/include/__system_error/system_error.h b/libcxx/include/__system_error/system_error.h
index 362e67505658cb..3ffa1029ca5c2e 100644
--- a/libcxx/include/__system_error/system_error.h
+++ b/libcxx/include/__system_error/system_error.h
@@ -39,8 +39,8 @@ class _LIBCPP_EXPORTED_FROM_ABI system_error : public runtime_error {
   _LIBCPP_HIDE_FROM_ABI const error_code& code() const _NOEXCEPT { return __ec_; }
 };
 
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw system_error(__ec, __what_arg);
 #else

diff  --git a/libcxx/include/__utility/unreachable.h b/libcxx/include/__utility/unreachable.h
index d833f74c2e4f1c..5525452aa55efd 100644
--- a/libcxx/include/__utility/unreachable.h
+++ b/libcxx/include/__utility/unreachable.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
   _LIBCPP_ASSERT_INTERNAL(false, "std::unreachable() was reached");
   __builtin_unreachable();
 }

diff  --git a/libcxx/include/__verbose_abort b/libcxx/include/__verbose_abort
index 195ce65b721ff7..244278aec652d2 100644
--- a/libcxx/include/__verbose_abort
+++ b/libcxx/include/__verbose_abort
@@ -20,7 +20,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 // This function should never be called directly from the code -- it should only be called through
 // the _LIBCPP_VERBOSE_ABORT macro.
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS
+[[__noreturn__]] _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS
 _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2) void __libcpp_verbose_abort(const char* __format, ...);
 
 // _LIBCPP_VERBOSE_ABORT(format, args...)

diff  --git a/libcxx/include/any b/libcxx/include/any
index 7630e8a057d055..6e4ff31ff9b620 100644
--- a/libcxx/include/any
+++ b/libcxx/include/any
@@ -127,7 +127,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if _LIBCPP_STD_VER >= 17
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST void __throw_bad_any_cast() {
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST void __throw_bad_any_cast() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_any_cast();
 #  else

diff  --git a/libcxx/include/future b/libcxx/include/future
index 01c0b10172cd3b..9a0eb7971a313d 100644
--- a/libcxx/include/future
+++ b/libcxx/include/future
@@ -472,7 +472,7 @@ inline _LIBCPP_HIDE_FROM_ABI error_condition make_error_condition(future_errc __
   return error_condition(static_cast<int>(__e), future_category());
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_future_error(future_errc __ev);
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_future_error(future_errc __ev);
 
 class _LIBCPP_EXPORTED_FROM_ABI future_error : public logic_error {
   error_code __ec_;

diff  --git a/libcxx/include/ios b/libcxx/include/ios
index 426838b91e5dc9..61a05fadd29a17 100644
--- a/libcxx/include/ios
+++ b/libcxx/include/ios
@@ -440,7 +440,7 @@ public:
   ~failure() _NOEXCEPT override;
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_failure(char const* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_failure(char const* __msg) {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw ios_base::failure(__msg);
 #  else

diff  --git a/libcxx/include/new b/libcxx/include/new
index 9015c4e712763c..207e4b46e0ca6e 100644
--- a/libcxx/include/new
+++ b/libcxx/include/new
@@ -166,9 +166,9 @@ public:
 };
 #endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0
 
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_array_new_length();
 #else

diff  --git a/libcxx/include/optional b/libcxx/include/optional
index 41d7515a2b6892..b0933b59b25d26 100644
--- a/libcxx/include/optional
+++ b/libcxx/include/optional
@@ -255,7 +255,7 @@ public:
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS void
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS void
 __throw_bad_optional_access() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_optional_access();

diff  --git a/libcxx/include/regex b/libcxx/include/regex
index 08aebc2266f5de..d59abb8daf8ec1 100644
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -983,7 +983,7 @@ public:
 };
 
 template <regex_constants::error_type _Ev>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_regex_error() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_regex_error() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw regex_error(_Ev);
 #else

diff  --git a/libcxx/include/stdexcept b/libcxx/include/stdexcept
index 853c185187c778..bdfc27aeac3742 100644
--- a/libcxx/include/stdexcept
+++ b/libcxx/include/stdexcept
@@ -209,9 +209,9 @@ public:
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 // in the dylib
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_runtime_error(const char*);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_runtime_error(const char*);
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_logic_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_logic_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw logic_error(__msg);
 #else
@@ -219,7 +219,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_logic_error(const cha
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_domain_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_domain_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw domain_error(__msg);
 #else
@@ -227,7 +227,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_domain_error(const ch
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_invalid_argument(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_invalid_argument(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw invalid_argument(__msg);
 #else
@@ -235,7 +235,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_invalid_argument(cons
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_length_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_length_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw length_error(__msg);
 #else
@@ -243,7 +243,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_length_error(const ch
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw out_of_range(__msg);
 #else
@@ -251,7 +251,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range(const ch
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_range_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_range_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw range_error(__msg);
 #else
@@ -259,7 +259,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_range_error(const cha
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_overflow_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_overflow_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw overflow_error(__msg);
 #else
@@ -267,7 +267,7 @@ _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_overflow_error(const
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_underflow_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_underflow_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw underflow_error(__msg);
 #else

diff  --git a/libcxx/include/string b/libcxx/include/string
index 3480b57375c118..46c5a5ac6de605 100644
--- a/libcxx/include/string
+++ b/libcxx/include/string
@@ -2230,11 +2230,11 @@ private:
     return std::__is_pointer_in_range(data(), data() + size() + 1, std::addressof(__v));
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const {
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const {
     std::__throw_length_error("basic_string");
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const {
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const {
     std::__throw_out_of_range("basic_string");
   }
 

diff  --git a/libcxx/include/typeinfo b/libcxx/include/typeinfo
index 54e0b4cf5d6348..a44fa4d73ee580 100644
--- a/libcxx/include/typeinfo
+++ b/libcxx/include/typeinfo
@@ -373,7 +373,7 @@ private:
 #endif // defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0
 
 _LIBCPP_BEGIN_NAMESPACE_STD
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_cast() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_cast() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_cast();
 #else

diff  --git a/libcxx/include/variant b/libcxx/include/variant
index 1367cd66f3701c..1cac603c27c243 100644
--- a/libcxx/include/variant
+++ b/libcxx/include/variant
@@ -298,7 +298,7 @@ struct __farray {
   _LIBCPP_HIDE_FROM_ABI constexpr const _Tp& operator[](size_t __n) const noexcept { return __buf_[__n]; }
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS void
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS void
 __throw_bad_variant_access() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_variant_access();

diff  --git a/libcxx/include/vector b/libcxx/include/vector
index 2442852c764a63..fc0a48669fe534 100644
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -995,9 +995,9 @@ private:
     __move_assign_alloc(__c, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>());
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
 
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __copy_assign_alloc(const vector& __c, true_type) {
     if (__alloc() != __c.__alloc()) {
@@ -2163,9 +2163,9 @@ public:
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __invariants() const;
 
 private:
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
 
   template <class _InputIterator, class _Sentinel>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void

diff  --git a/libcxx/src/stdexcept.cpp b/libcxx/src/stdexcept.cpp
index bc25c0f9e6ef62..134d28efb750f3 100644
--- a/libcxx/src/stdexcept.cpp
+++ b/libcxx/src/stdexcept.cpp
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN void __throw_runtime_error(const char* msg) {
+void __throw_runtime_error(const char* msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw runtime_error(msg);
 #else

diff  --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
index cf07b3ef1ef270..12db5381a7b1ba 100644
--- a/libcxx/src/string.cpp
+++ b/libcxx/src/string.cpp
@@ -28,8 +28,8 @@ struct __basic_string_common;
 // The struct isn't declared anymore in the headers. It's only here for ABI compatibility.
 template <>
 struct __basic_string_common<true> {
-  _LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_length_error() const;
-  _LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_out_of_range() const;
+  [[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_length_error() const;
+  [[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_out_of_range() const;
 };
 
 void __basic_string_common<true>::__throw_length_error() const { std::__throw_length_error("basic_string"); }

diff  --git a/libcxx/src/support/runtime/exception_fallback.ipp b/libcxx/src/support/runtime/exception_fallback.ipp
index 18ff4b83d87651..ca542c9497214f 100644
--- a/libcxx/src/support/runtime/exception_fallback.ipp
+++ b/libcxx/src/support/runtime/exception_fallback.ipp
@@ -21,7 +21,7 @@ unexpected_handler set_unexpected(unexpected_handler func) noexcept {
 
 unexpected_handler get_unexpected() noexcept { return __libcpp_atomic_load(&__unexpected_handler); }
 
-_LIBCPP_NORETURN void unexpected() {
+[[noreturn]] void unexpected() {
   (*get_unexpected())();
   // unexpected handler should not return
   terminate();
@@ -33,7 +33,7 @@ terminate_handler set_terminate(terminate_handler func) noexcept {
 
 terminate_handler get_terminate() noexcept { return __libcpp_atomic_load(&__terminate_handler); }
 
-_LIBCPP_NORETURN void terminate() noexcept {
+[[noreturn]] void terminate() noexcept {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif // _LIBCPP_HAS_NO_EXCEPTIONS

diff  --git a/libcxx/src/support/runtime/exception_msvc.ipp b/libcxx/src/support/runtime/exception_msvc.ipp
index 323cd9d1800576..163aec057d9b5c 100644
--- a/libcxx/src/support/runtime/exception_msvc.ipp
+++ b/libcxx/src/support/runtime/exception_msvc.ipp
@@ -32,7 +32,7 @@ unexpected_handler set_unexpected(unexpected_handler func) noexcept { return ::s
 
 unexpected_handler get_unexpected() noexcept { return ::_get_unexpected(); }
 
-_LIBCPP_NORETURN void unexpected() {
+[[noreturn]] void unexpected() {
   (*get_unexpected())();
   // unexpected handler should not return
   terminate();
@@ -42,7 +42,7 @@ terminate_handler set_terminate(terminate_handler func) noexcept { return ::set_
 
 terminate_handler get_terminate() noexcept { return ::_get_terminate(); }
 
-_LIBCPP_NORETURN void terminate() noexcept {
+[[noreturn]] void terminate() noexcept {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #endif // _LIBCPP_HAS_NO_EXCEPTIONS

diff  --git a/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp b/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
index bdb17b9996b7ea..8f5c2060bb06c5 100644
--- a/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
+++ b/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
@@ -40,7 +40,7 @@ nested_exception::nested_exception() noexcept : __ptr_(current_exception()) {}
 
 nested_exception::~nested_exception() noexcept {}
 
-_LIBCPP_NORETURN void nested_exception::rethrow_nested() const {
+void nested_exception::rethrow_nested() const {
   if (__ptr_ == nullptr)
     terminate();
   rethrow_exception(__ptr_);
@@ -55,7 +55,7 @@ exception_ptr current_exception() noexcept {
   return ptr;
 }
 
-_LIBCPP_NORETURN void rethrow_exception(exception_ptr p) {
+void rethrow_exception(exception_ptr p) {
   __cxa_rethrow_primary_exception(p.__ptr_);
   // if p.__ptr_ is NULL, above returns so we terminate
   terminate();

diff  --git a/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp b/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
index 6dad248f9e1fd1..174b44ce0e6f72 100644
--- a/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
+++ b/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
@@ -31,7 +31,7 @@ struct exception_ptr {
 
 } // namespace __exception_ptr
 
-_LIBCPP_NORETURN void rethrow_exception(__exception_ptr::exception_ptr);
+[[noreturn]] void rethrow_exception(__exception_ptr::exception_ptr);
 
 exception_ptr::~exception_ptr() noexcept { reinterpret_cast<__exception_ptr::exception_ptr*>(this)->~exception_ptr(); }
 
@@ -55,13 +55,13 @@ exception_ptr exception_ptr::__from_native_exception_pointer(void* __e) noexcept
 
 nested_exception::nested_exception() noexcept : __ptr_(current_exception()) {}
 
-_LIBCPP_NORETURN void nested_exception::rethrow_nested() const {
+[[noreturn]] void nested_exception::rethrow_nested() const {
   if (__ptr_ == nullptr)
     terminate();
   rethrow_exception(__ptr_);
 }
 
-_LIBCPP_NORETURN void rethrow_exception(exception_ptr p) {
+[[noreturn]] void rethrow_exception(exception_ptr p) {
   rethrow_exception(reinterpret_cast<__exception_ptr::exception_ptr&>(p));
 }
 

diff  --git a/libcxx/src/support/runtime/exception_pointer_msvc.ipp b/libcxx/src/support/runtime/exception_pointer_msvc.ipp
index b87742b32ded6f..2be5136176e32b 100644
--- a/libcxx/src/support/runtime/exception_pointer_msvc.ipp
+++ b/libcxx/src/support/runtime/exception_pointer_msvc.ipp
@@ -61,13 +61,13 @@ exception_ptr current_exception() noexcept {
   return __ret;
 }
 
-_LIBCPP_NORETURN void rethrow_exception(exception_ptr p) { __ExceptionPtrRethrow(&p); }
+[[noreturn]] void rethrow_exception(exception_ptr p) { __ExceptionPtrRethrow(&p); }
 
 nested_exception::nested_exception() noexcept : __ptr_(current_exception()) {}
 
 nested_exception::~nested_exception() noexcept {}
 
-_LIBCPP_NORETURN void nested_exception::rethrow_nested() const {
+[[noreturn]] void nested_exception::rethrow_nested() const {
   if (__ptr_ == nullptr)
     terminate();
   rethrow_exception(__ptr_);

diff  --git a/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp b/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
index e12b0caf419d24..1fe3127f18b0bb 100644
--- a/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
+++ b/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
@@ -44,7 +44,7 @@ nested_exception::~nested_exception() noexcept {}
 
 #endif
 
-_LIBCPP_NORETURN void nested_exception::rethrow_nested() const {
+[[noreturn]] void nested_exception::rethrow_nested() const {
 #warning exception_ptr not yet implemented
   fprintf(stderr, "exception_ptr not yet implemented\n");
   ::abort();
@@ -61,7 +61,7 @@ exception_ptr current_exception() noexcept {
   ::abort();
 }
 
-_LIBCPP_NORETURN void rethrow_exception(exception_ptr p) {
+[[noreturn]] void rethrow_exception(exception_ptr p) {
 #warning exception_ptr not yet implemented
   fprintf(stderr, "exception_ptr not yet implemented\n");
   ::abort();

diff  --git a/libcxx/src/vector.cpp b/libcxx/src/vector.cpp
index b6153b0e9bf991..3f3a906d6421f0 100644
--- a/libcxx/src/vector.cpp
+++ b/libcxx/src/vector.cpp
@@ -17,8 +17,8 @@ struct __vector_base_common;
 
 template <>
 struct __vector_base_common<true> {
-  _LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_length_error() const;
-  _LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_out_of_range() const;
+  [[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_length_error() const;
+  [[noreturn]] _LIBCPP_EXPORTED_FROM_ABI void __throw_out_of_range() const;
 };
 
 void __vector_base_common<true>::__throw_length_error() const { std::__throw_length_error("vector"); }

diff  --git a/libcxx/test/support/assert_macros.h b/libcxx/test/support/assert_macros.h
index 1059823dcb2465..b7011794025bf0 100644
--- a/libcxx/test/support/assert_macros.h
+++ b/libcxx/test/support/assert_macros.h
@@ -50,7 +50,7 @@ void test_log(const char* condition, const char* file, int line, const F& functo
 }
 
 template <class Arg>
-TEST_NORETURN void test_fail(const char* file, int line, const Arg& arg) {
+[[noreturn]] void test_fail(const char* file, int line, const Arg& arg) {
   test_log("", file, line, arg);
   std::abort();
 }

diff  --git a/libcxx/test/support/check_assertion.h b/libcxx/test/support/check_assertion.h
index 329ce819a6c8d0..47ebfeeeefc0f4 100644
--- a/libcxx/test/support/check_assertion.h
+++ b/libcxx/test/support/check_assertion.h
@@ -142,7 +142,7 @@ std::string ToString(std::array<DeathCause, N> const& causes) {
   return ss.str();
 }
 
-TEST_NORETURN void StopChildProcess(DeathCause cause) { std::exit(static_cast<int>(cause)); }
+[[noreturn]] void StopChildProcess(DeathCause cause) { std::exit(static_cast<int>(cause)); }
 
 DeathCause ConvertToDeathCause(int val) {
   if (val < static_cast<int>(DeathCause::VerboseAbort) || val > static_cast<int>(DeathCause::Unknown)) {
@@ -260,7 +260,7 @@ class DeathTest {
   }
 
   template <class Func>
-  TEST_NORETURN void RunForChild(Func&& f) {
+  [[noreturn]] void RunForChild(Func&& f) {
     close(GetStdOutReadFD()); // don't need to read from the pipe in the child.
     close(GetStdErrReadFD());
     auto DupFD = [](int DestFD, int TargetFD) {

diff  --git a/libcxx/test/support/count_new.h b/libcxx/test/support/count_new.h
index 61c8ca16ab0d04..c8169d3acceabd 100644
--- a/libcxx/test/support/count_new.h
+++ b/libcxx/test/support/count_new.h
@@ -24,14 +24,13 @@
 
 namespace detail
 {
-   TEST_NORETURN
-   inline void throw_bad_alloc_helper() {
+[[noreturn]] inline void throw_bad_alloc_helper() {
 #ifndef TEST_HAS_NO_EXCEPTIONS
-       throw std::bad_alloc();
+  throw std::bad_alloc();
 #else
        std::abort();
 #endif
-   }
+}
 }
 
 class MemCounter

diff  --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
index 5d4c1a65cfafb2..3aa818af1d2695 100644
--- a/libcxx/test/support/test_macros.h
+++ b/libcxx/test/support/test_macros.h
@@ -214,12 +214,6 @@
 #define TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT
 #endif
 
-#if defined(_LIBCPP_NORETURN)
-#define TEST_NORETURN _LIBCPP_NORETURN
-#else
-#define TEST_NORETURN [[noreturn]]
-#endif
-
 #if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || \
   (!(TEST_STD_VER > 14 || \
     (defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606L)))


        


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