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Message-ID: <42C44FE9.2050208@x-ray.at>
Date: Thu, 30 Jun 2005 22:02:49 +0200
From: Reini Urban <rurban AT x-ray DOT at>
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To: "'Cygwin List'" <cygwin AT cygwin DOT com>
Subject: Re: gcc bug: convert_move -O3
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Dave Korn schrieb:
>>>2)  Also, the function call is through a
>>>pointer-to-function-taking-stdargs, but the function itself is not a
>>>stdargs function.  Given the wrong calling conventions, this is liable
>>>to lead to both caller *and* callee cleaning the args off the stack.....
>>
>>Calling conventions should be determined at run-time who will pop the
>>stack. 
> 
>   Sorry Reini, this sentence doesn't make sense to me.  AFAIUI, who will pop
> the stack is determined at compiletime, according to whether the compiler
> outputs a plain "ret" or a ret with a size-to-pop at the end of the
> callee-function, and according to whether it emits code at the call site to
> adjust %esp or not.
> 
>>Both DLL types should be able to be loaded. 
> 
>   Now you've really lost me.  Are you saying that this particular dll gets
> built in two versions using different calling conventions?  I don't
> understand here.

I'm talking about FFI's, for which this hack30 was invented and used. 
(30 for max 30 args)
FFI's need to call functions from stdcall and cdecl shared libs, so the 
FFI must provide both conventions. stdcall == WinAPI, cdecl e.g. most 
cygwin dll's.
But now we are way offtopic.
-- 
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/
http://phpwiki.org/

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