[fpc-devel] Status of SEH in FPC

Sven Barth pascaldragon at googlemail.com
Sun Mar 3 17:55:03 CET 2013


On 03.03.2013 17:52, Sven Barth wrote:
> On 03.03.2013 17:45, Flávio Etrusco wrote:
>> 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?
>
> I don't know whether there are any plans, but I hope so...

Just so that nobody misunderstands it: this does not mean that Sergei 
must be the one that implements it...

Regards,
Sven




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