Re: [PATCH v14 0/11] MR9209: vccorlib140: Implement Platform::Exceptions.

[Piotr Caban (＠piotr)]

On Sun Nov  2 18:45:06 2025 +0000, Piotr Caban wrote:
> It looks like on vccorlib140 side there's something along these lines:
> static void DECLSPEC_NORETURN throw_exception(struct Exception *excp,
> const cxx_exception_type *type)
>  {
>     /* Thrown exceptions have a refcount of 2. */
>     __TRY
>     {
>         IInspectable_AddRef(&excp->IInspectable_iface);
>         _CxxThrowException(&excp, type);
>     }
>     __FINALLY_CTX(throw_exception_finally, &excp->IInspectable_iface);
> }
>
> I guess it tries to workaround some kind of refcounting error in older
> C-runtime/some kind of app. I'm not sure if it makes sense to replicate
> it as long as there's no application that depends on it. How about
> removing AddRef call from throw_exception helper?

The bug in vcruntime140 is caused by difference in __C_specific_handler (between ntdll and C-runtime). It looks like native is sometimes destroying the exception object there. It's not specific to WinRT exceptions.