Re: [OpenBIOS] Local variable support - OpenBIOS

27 Aug 2012


      On Aug 25, 2012, at 8:19 AM, openbios-request@openbios.org wrote:
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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
LFIND to INTERPRET.
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.
HTH,
Mark.
I did try at one time to do this, but decided to go the route of imitating how x86 assembly uses local variables.