Treat swift_willThrow(Typed) as not locking or performing allocation #77780
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Prior to throwing, Swift emits a call to `swift_willThrow(Typed)`, which allows various diagnostic tools (such as debuggers and testing libraries) to intercept errors at the point where they are initially thrown. Since `swift_willThrow(Typed)` can be hooked by arbitrary code at runtime, there is no way for it to meet performance constraints like @_noLocks or @_noAllocation. Therefore, in a function that has those performance constraints specified, disable emission of the call to `swift_willThrow(Typed)`. Fixes rdar://140230684.
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This was referenced Nov 21, 2024
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Prior to throwing, Swift emits a call to
swift_willThrow(Typed), which allows various diagnostic tools (such as debuggers and testing libraries) to intercept errors at the point where they are initially thrown.Since
swift_willThrow(Typed)can be hooked by arbitrary code at runtime, there is no way for it to meet performance constraints like @_noLocks or @_noAllocation. Therefore, in a function that has those performance constraints specified, disable emission of the call toswift_willThrow(Typed).Fixes rdar://140230684.