Re: Popping registers

["Sam Lauber" <sam124 at operamail dot com>]

I didn't know that registers are on a stack.

>> What is a stack? What does the compiler use it for? Why would messing
>> with it be a bad idea? And no, I do not know assembly, and I haven't
>> had computer science class yet.
> 
> Well if you don't know what a stack is, then why are you asking how to
> pop from it? :)
> 
> The stack is where the program allocates local storage and
> pushes parameters and save/restores registers used by called functions
> as well as save the return address when it calls another function so
> the called function knows where to access the parameters and how to return to
> the caller function.
> 
> Directly or indirectly modifying the stack pointer behind the back
> of the compiler is *really* asking for trouble since modifications to
> the stack pointer that are not known to the compiler will break the
> ABI and cause you rprogram to "go off into the weeds" with no hope of
> understanding why.  Richard is right; it is *definitely* something you
> don't want to do in C.  If you have to abuse the stack, then roll up
> your sleeves and write in assembler.
> 
> Perhaps the real question is to ask *why* you believe that you need to
> pop a value from the stack(and thereby modify the stack pointer)?
> 
> Do some research on what a stack is and how its used in
> programming(here Google is *definitely* your friend).
> 
> --
> Peter Barada
> peter@the-baradas.com

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