[OpenBIOS] Local variable support

[Mark Cave-Ayland]

On 23/08/12 13:18, Mark Cave-Ayland wrote:

> When I had a quick look at doing something earlier a while back, I
> noticed that OpenBIOS already has a concept of multiple dictionaries
> with a search order (see dict-list?). My idea for an implementation was
> to intercept docol to create a new dictionary at the top of the
> function, add it to the head of the search list and then add the values
> from the local variable declaration. This is pretty much what happens
> when you "cd" to a particular path in the device tree.
>
> Similarly you can then intercept dosemi from the search list to remove
> the dictionary and clear up. The advantage of this approach is that you
> can use all the in-built dictionary functions to manage your local
> variable words, rather than your current approach which is to
> re-implement this functionality yourself.

Actually after I little research, this isn't the right approach after 
all - apparently the variables are stored on the return stack: 
http://www.softsynth.com/pforth/pf_ref.php#Local%20Variables%20{%20foo%20--}.


ATB,

Mark.