[OpenBIOS] Local variable support

Mark Cave-Ayland mark.cave-ayland at ilande.co.uk
Thu Aug 23 14:18:14 CEST 2012

On 22/08/12 02:44, Programmingkid wrote:

> The following code is for the use of local variables in OpenBIOS. I was
> able to successfully make a word that used local variables. The work
> isn't complete. There is still work to be done with the INTERPRET word.
> The LFIND word has be implemented in the INTERPRET word for local
> variables to be recognized during the compile state. I just need a
> C-like CONTINUE word to go back to the start of a loop to fix all my
> problems with INTERPRET. Maybe someone knows a better way of adding
> I would appreciate any comments, suggestions, or advice for the
> following code.

Interesting work! I think that you may have made this a harder problem 
that it should be though.

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.



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