Re: [Amforth-devel] Starting with amforth v4

[Erich W. <ew....@na...>]

Hello,

On 07/04/2010 12:46 PM, pito wrote:
> Andy, after I rised the Q I did it directly with my dev system. Frankly
> the way how it works is changing my understanding for "interactivity".
> Basically you cannot delete wrong words so the space occupied will grow.
> Imagine my apollo picosatellite flying in the space and I am tweaking
> the sw in its guidance computer. So I have to have at least a chance
> activate/deactivate specific words. As I've seen the forth manual the
> last definition of a word is valid. So you may have many words with
> same name, however the last one will be used (am I right?) for "following"
> usage. Imagine wordlist:
>> words
> navigate distance position sinus sinus speed height sinus ....
>
> The Q: which sinus word will be used in speed and height calculations?

Assuming height calls sinus. When height is compiled, it searches
for sinus in the current wordlist. So it finds

 > navigate distance position sinus sinus speed height sinus ....
------------------------------------------------------^^^^
this one.

HOWEVER, sinus is redefined twice. When position is compiled,
it will find
 > navigate distance position sinus sinus speed height sinus ....
-----------------------------^^^^^
this one. Same when you call it interactively in this state
of definitions.

And redefining sinus will *NOT* change the reference to
the older version of sinus in height.


I'm sure you have consulted
http://home.iae.nl/users/mhx/sf.html
Chapter 9 (under the hood) gives a brief outline, how
dictionary entries are organized.


Cheers,
Erich