Danny Backx wrote:
>
> I've had little time to spend on this recently, but I've approached
> things the other way. If I get far enough, then maybe both may meet.
>
Yes. What you're doing would be the very minimum we need to do
to have the compiler output the needed structures.
> I fiddled with gcc/config/arm/mingw32.h to put stuff around a function.
> This is the difference obtained on a small example :
>
> dannypc: {13} diff nullptr-before.s nullptr.s
> 12c12,18
> < .global main
> ---
>> .global main
>> @ ASM_DECLARE_FUNCTION_NAME a
>> .global _cegcc_main_data
^^^^^^^
You shouln't need to make these symbols global, but I understand
it if you are using it for debug purposes.
>> _cegcc_main_data:
>> .word 0 /* _cegcc_main_handler */
>> .word 0 /* _cegcc_main_size */
^^^
This is not supposed to be the size, but a pointer
to data to the passed to the handler. The size goes into the
.pdata structure, as does the prologue size. It looks like
you've already found how to get at the prologue size, as
you're outputting "yow prologue" - probably from arm.c, right?
>
> Right now this is pretty useless, I'd need an interface to be able to
> get to this from source. Working on that.
>
That's when things start getting interesting. Curious on what you
are thinking to do it? Are you going to try to change the c parser
to understand __try/__except/__finally, or are you looking for a
new __attribute__, a new builtin, other?
I'm also curious on if we could reuse the runtime support from
coredll.dll, like __C_specific_handler.
Great to see some work on this! A hint: You can infer a lot of info
of SEH on ARM from the more abundant info on SEH on x64, which
is similar. Also looking for OS/2 model of exceptions is informative,
as it is very similar to SEH on x86 - this is comprehensive as
MSFT worked on it.
Cheers,
Pedro Alves
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