Re: calling functions generically

Brett Bibby wrote:
> I'm trying to write a generic function calling program such that I
> can take a parameter list and the address of a function and build the
> call dynamically at runtime on Windows, GameCube and PS2. I have an
> array of input and output codes so I know the types and order of
> parameters to use for the call, and what (if any) the return value
> is. I'm starting with Windows first, and using CodeWarrior for all
> platforms.

I wrote a small example of a generic function caller for lua 4.0, it's 
not optimized, but seems works fine:

http://lua-users.org/wiki/LuaDeclare


If I recall correctly there is a good explanation about the different 
calling conventions on the msdn. However, it seems that different 
compilers implement the calling conventions in different ways.

In most cases it works as follows: Small results are usually returned in 
eax:edx. Floating point results are left at the top of the stack. Bigger 
structures are not returned on the stack, instead of that, a pointer to 
the structure is pushed as a hidden argument and the result is copied there.

Hope that helps.

-- 
Ignacio Castaño
[email protected]


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