[libc++] Mark a few functions in the dylib as noexcept (#94098)

This avoids generating landing pads in some of the `atomic` functions
that will never be used, since these functions never throw exceptions.

2 files changed, 11 insertions, 10 deletions

diff --git a/libcxx/src/atomic.cpp b/libcxx/src/atomic.cpp
index 7142f38..ae06215 100644
--- a/libcxx/src/atomic.cpp
+++ b/libcxx/src/atomic.cpp
@@ -169,17 +169,18 @@ static void __libcpp_atomic_notify(void const volatile* __location) {
       &__entry->__platform_state,
       false /* when laundering, we can't handle notify_one */);
 }
-_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile* __location) {
+_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(void const volatile* __location) noexcept {
   __libcpp_atomic_notify(__location);
 }
-_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(void const volatile* __location) {
+_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(void const volatile* __location) noexcept {
   __libcpp_atomic_notify(__location);
 }
-_LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(void const volatile* __location) {
+_LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t __libcpp_atomic_monitor(void const volatile* __location) noexcept {
   auto const __entry = __libcpp_contention_state(__location);
   return __libcpp_contention_monitor_for_wait(&__entry->__contention_state, &__entry->__platform_state);
 }
-_LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(void const volatile* __location, __cxx_contention_t __old_value) {
+_LIBCPP_EXPORTED_FROM_ABI void
+__libcpp_atomic_wait(void const volatile* __location, __cxx_contention_t __old_value) noexcept {
   auto const __entry = __libcpp_contention_state(__location);
   __libcpp_contention_wait(&__entry->__contention_state, &__entry->__platform_state, __old_value);
 }
@@ -187,19 +188,19 @@ _LIBCPP_EXPORTED_FROM_ABI void __libcpp_atomic_wait(void const volatile* __locat
 /* When the incoming atomic happens to be the platform wait size, we still need to use the
    table for the contention detection, but we can use the atomic directly for the wait. */
 
-_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile* __location) {
+_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_one(__cxx_atomic_contention_t const volatile* __location) noexcept {
   __libcpp_contention_notify(&__libcpp_contention_state(__location)->__contention_state, __location, true);
 }
-_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile* __location) {
+_LIBCPP_EXPORTED_FROM_ABI void __cxx_atomic_notify_all(__cxx_atomic_contention_t const volatile* __location) noexcept {
   __libcpp_contention_notify(&__libcpp_contention_state(__location)->__contention_state, __location, false);
 }
 // This function is never used, but still exported for ABI compatibility.
 _LIBCPP_EXPORTED_FROM_ABI __cxx_contention_t
-__libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile* __location) {
+__libcpp_atomic_monitor(__cxx_atomic_contention_t const volatile* __location) noexcept {
   return __libcpp_contention_monitor_for_wait(&__libcpp_contention_state(__location)->__contention_state, __location);
 }
 _LIBCPP_EXPORTED_FROM_ABI void
-__libcpp_atomic_wait(__cxx_atomic_contention_t const volatile* __location, __cxx_contention_t __old_value) {
+__libcpp_atomic_wait(__cxx_atomic_contention_t const volatile* __location, __cxx_contention_t __old_value) noexcept {
   __libcpp_contention_wait(&__libcpp_contention_state(__location)->__contention_state, __location, __old_value);
 }
 
diff --git a/libcxx/src/barrier.cpp b/libcxx/src/barrier.cpp
index baa2610..bbcfb60 100644
--- a/libcxx/src/barrier.cpp
+++ b/libcxx/src/barrier.cpp
@@ -63,10 +63,10 @@ _LIBCPP_EXPORTED_FROM_ABI __barrier_algorithm_base* __construct_barrier_algorith
   return new __barrier_algorithm_base(__expected);
 }
 _LIBCPP_EXPORTED_FROM_ABI bool
-__arrive_barrier_algorithm_base(__barrier_algorithm_base* __barrier, __barrier_phase_t __old_phase) {
+__arrive_barrier_algorithm_base(__barrier_algorithm_base* __barrier, __barrier_phase_t __old_phase) noexcept {
   return __barrier->__arrive(__old_phase);
 }
-_LIBCPP_EXPORTED_FROM_ABI void __destroy_barrier_algorithm_base(__barrier_algorithm_base* __barrier) {
+_LIBCPP_EXPORTED_FROM_ABI void __destroy_barrier_algorithm_base(__barrier_algorithm_base* __barrier) noexcept {
   delete __barrier;
 }