(part 16) Han from China answers your C questions

[Nomen Nescio]

memory used while declaring function

c.***********@gmail.com said:

Is there any memory allocated in stack when declaring a function
e.g void fun(int a,int b,int c);
Is it true that compiler reserves 3 stack spaces for parameters a ,b
and c....

Pushing the three arguments on a stack is one way of implementing
a function CALL (but not the only way).

As for function DECLARATIONS, I would say no. However, I can't
think of any reasons why a compiler COULDN'T pre-allocate some space
SOMEWHERE for AT LEAST ONE invocation of the function. Think about
why I said "AT LEAST ONE". What happens to the arguments in the
following cases?

fun() ---fun()
fun() ---scrotum() ---fun()
Yours,
Han from China

[Richard Tobin]

In article <ce******************************@dizum.com>,
Nomen Nescio <no****@dizum.comwrote:

>As for function DECLARATIONS, I would say no. However, I can't
think of any reasons why a compiler COULDN'T pre-allocate some space
SOMEWHERE for AT LEAST ONE invocation of the function.

In languages that didn't allow recursion (e.g. old Fortran), it was
common to allocate fixed locations for the arguments and local
variables of functions. In effect, you could make all variables
static by renaming.

-- Richard
--
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