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From: "Luke A. Guest" <laguest@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: GNAT parameter passing, C-style?
Date: Thu, 01 Jan 2004 05:20:08 +0000
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On Wed, 31 Dec 2003 21:50:59 -0500, Frank J. Lhota wrote:


> To be more precise, for functions with only a few arguments, these issues do
> not arise. I am curious, however, as to how the Sun compiler handles
> parameter lists long enough to exhaust available registers. My guess is that
> those parameters not passed via registers are pushed on the stack in reverse
> order, and are popped off by the calling function.
> 
> I'm also curious as to how the Sun version of <stdarg.h> handles a
> combination of register and stack parameters. I imagine that they must use
> some implementation-specific extension to implement <stdarg.h>.

This is interesting considering the SPARC's register windows (at any one
point there is 32 register available to a function, FPU registers are not
even considered). But as I remember, it's ther same again, if the
registers run out the stack is used in reverse as usual.

Luke.