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Make _swift_willThrow atomic (#62349)

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* Make _swift_willThrow atomic
This commit is contained in:
Jonathan Grynspan
2022-12-03 10:41:56 -05:00
committed by GitHub
parent ed01f202e7
commit e057172b6f
5 changed files with 47 additions and 81 deletions
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13
stdlib/public/runtime/ErrorObjectCommon.cpp
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@@ -24,7 +24,11 @@
using namespace swift;
void (*swift::_swift_willThrow)(SwiftError *error);
std::atomic<void (*)(SwiftError *error)> swift::_swift_willThrow;
void swift::_swift_setWillThrowHandler(void (* handler)(SwiftError *error)) {
_swift_willThrow.store(handler, std::memory_order_release);
}
/// Breakpoint hook for debuggers, and calls _swift_willThrow if set.
SWIFT_CC(swift) void
@@ -32,7 +36,8 @@ swift::swift_willThrow(SWIFT_CONTEXT void *unused,
SWIFT_ERROR_RESULT SwiftError **error) {
// Cheap check to bail out early, since we expect there to be no callbacks
// the vast majority of the time.
if (SWIFT_LIKELY(!_swift_willThrow))
return;
_swift_willThrow(*error);
auto handler = _swift_willThrow.load(std::memory_order_acquire);
if (SWIFT_UNLIKELY(handler)) {
(* handler)(*error);
}
}