Hi Marco,
"Marco Maggi" <[EMAIL PROTECTED]> writes:
> Woah! I had not noticed that the binding is created in (oop
> goops).
He he. ;-)
> SCM
> my_func (SCM arg)
> {
> client_data_t data = (client_data_t)SCM_SMOB_DATA(arg);
>
> /* Do something with "data" but do not access "arg"
> anymore. With compiler optimisations the reference
> to the SMOB can disappear.
>
> If here I call scm_* functions, GC collects the
> SMOB removing the carpet from under my feet and
> if I access "data": crash.
>
> So:
> */
> scm_remember_upto_here_1(arg);
> }
Hmm, right (except if ARG was passed on the stack, which must not be the
case with most ABIs).
OTOH, when `my_func ()' is a subr called by the evaluator, there
definitely are live references to ARG in the heap (argument list) and
probably on the stack too (local variables in `CEVAL ()'), which is why
it rarely hurts in practice...
>>Records are too common to be removed from the core: almost
>>everyone would end up loading that module.
>
> This surprises me. I thought that they were a rarely used
> feature because they are unschemey :-) and because of the
> existence of GOOPS.
Well, maybe my statement was too strong. At least I do use records a
lot. Any programming language needs vector-like data structures, and
records provide a convenient interface to them in many scenarios.
Thanks,
Ludovic.
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