Subject: Re: stdcall lib functions with exception throwing callbacks vs Dwarf2 EH
From: Richard Henderson <[email-masked]>
To: Danny Smith <[email-masked]>
Cc: [email-masked], Cygwin <[email-masked]>, mingw-dvlpr <[email-masked]>
Date: Tue, 23 Nov 2004 16:32:40 -0800

On Wed, Nov 24, 2004 at 11:27:11AM +1300, Danny Smith wrote:
> Before I pull any more hair out trying, does any one have any hints on
> how to use an MD_FALLBACK_FRAME_STATE_FOR to workaround ...

That would be wrong.

I think the most likely explanation is that there's a bug in the
dwarf2 generator for stdcall functions with -fomit-frame-pointer,
and the problem should be attacked there.

If you've got a call that takes 12 bytes of arguments on the stack
and pop them on return, then the unwind info should look like

	# DW_CFA_GNU_args_size 12
	call foo
	# DW_CFA_def_cfa_offset <previous value - 12>

r~

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