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In article <4hv05f$j9i@solutions.solon.com>
schwarz@a2.complang.tuwien.ac.at (Konrad Schwarz) writes:

|> In article <4hqed0$1lc@solutions.solon.com>, kanze@gabi-soft.fr (J. Kanze) writes:
|> |>     [Concerning alloca...]
|> I: As far as I know, implementing alloca via the stack is trivial on
|> I: any general-purpose CPU, but I am interested in hearing of counter examples.
|> |> 
|> |> So what do you do on machines that don't have a stack?

|> General-purpose CPU's have stacks, at least in my book.

IBM mainframes don't have stacks.  Would you not consider them general
purpose CPU's?  (While most modern architectures have stacks, I
suspect that if you looked at all of the general-purpose CPU's in
existance, you'd find more architectures without a stack than with.)

|> How do you
|> implement C on machines that don't have a stack?

The same way you implement any other language, I suppose.  On the one
machine I have any experience with, local frames were allocated and
freed using a mechanism similar to malloc/free.  Once allocated, the
size of the local frame could not be changed.

--
James Kanze         Tel.: (+33) 88 14 49 00        email: kanze@gabi-soft.fr
GABI Software, Sarl., 8 rue des Francs-Bourgeois, F-67000 Strasbourg, France
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