[Gambas-user] Gambas has Gosub now!

[Emil Lenngren]

Just store it inside a T_POINTER?
val->type = T_POINTER;
val->_pointer.value = PC;

Or whatever big enough datatype that doesn't do anything on RELEASE.

2012/7/9 Benoît Minisini <gambas at ...1...>

> Le 09/07/2012 00:13, Emil Lenngren a écrit :
> > I have a little optimization idea:
> >
> > Instead of allocating a new array EVERY time a gosub is called, instead
> use
> > the normal gambas stack.
> > First, let GP represent the offset 0 in &BP[fp->n_local + fp->n_ctrl].
> >
> > At a gosub, run STACK_check(1 + fp->stack_usage - fp->n_local), then the
> > return address and ctrl values are stored on the stack starting at
> > &BP[fp->n_local + fp->n_ctrl + GP], then GP and SP is added by 1 +
> > fp->n_ctrl.
> >
> > On a gosub return, if GP == 0, it is a normal return. If not, it is a
> gosub
> > return. Then first subtract 1 + fp->n_ctrl from GP and SP and restore the
> > ctrl values and PC.
> >
> > At exception handling, going to a Catch, change
> > while (SP > (BP + FP->n_local + FP->n_ctrl))
> > to
> > while (SP > (BP + FP->n_local + FP->n_ctrl + GP))
> >
> > I think there is nothing else that has to be done. Leaving a function
> pops
> > off the stack until it reaches PP, so that is fine.
> >
> > It is also possible to completely remove the function
> > STACK_free_gosub_stack.
> >
> > Can this be a good idea?
> >
> > /Emil
> >
>
> Yes! But I must think a bit about it.
>
> For example, any stack slot can be sent to RELEASE(), so something must
> be done if we have to store the value of PC in the stack. But it should
> not be too difficult...
>
> --
> Benoît Minisini
>
>
>
>
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