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Date: Tue, 23 Nov 2004 16:32:40 -0800
From: Richard Henderson <rth AT redhat DOT com>
To: Danny Smith <dannysmith AT users DOT sourceforge DOT net>
Cc: gcc AT gcc DOT gnu DOT org, Cygwin <cygwin AT cygwin DOT com>,
   mingw-dvlpr <mingw-dvlpr AT lists DOT sourceforge DOT net>
Subject: Re: stdcall lib functions with exception throwing callbacks vs Dwarf2 EH
Message-ID: <20041124003240.GA6028@redhat.com>
Mail-Followup-To: Richard Henderson <rth AT redhat DOT com>, Danny Smith <dannysmith AT users DOT sourceforge DOT net>, gcc AT gcc DOT gnu DOT org, Cygwin <cygwin AT cygwin DOT com>, mingw-dvlpr <mingw-dvlpr AT lists DOT sourceforge DOT net>
References: <001701c4d1ab$949322e0$0a6d65da AT DANNY>
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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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