[fpc-devel] Status of SEH in FPC

[Flávio Etrusco]

On Sun, Mar 3, 2013 at 1:28 AM, Sergei Gorelkin <sergei_gorelkin at mail.ru> wrote:
> 03.03.2013 2:53, Flávio Etrusco пишет:
>
>> Hello,
>>
>> what's the current state of the SEH in FPC trunk?
>> IIRC - and according to wikipedia ;-) - SEH, at least for Windows, was
>> in the 2.7 roadmap, but I can't find any related brach, or commit, or
>> post.
>> Also AFAIU would have some gains in both executable size and speed,
>> correct?
>>
> By now SEH is fully implemented for Win64 target, but you need to cycle the
> compiler with OPT=-dTEST_WIN64_SEH to enable it.
> The most of it was committed in revision 20098.
>
> The effect of SEH is two-fold: it gives some performance gain when running
> without exceptions, but big penalty when exceptions occur. It somewhat
> reduces code size but at the same time adds some data, so executable size
> may not reduce.
>
> The main advantage of SEH is the conformance with OS exception handing
> scheme. Without it, it was almost impossible to use DLLs that raise
> exceptions.
>
> Regards,
> Sergei

Thanks. And are there any plans to implement it for Win32?