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Commit Graph

6 Commits

Author SHA1 Message Date
Virgil Dupras
67c55b0b2f forth: Forth-ify ROT, a native word!
This requires us to significantly adjust our build process, which
now has 3 stages.
2020-03-24 13:46:05 -04:00
Virgil Dupras
c3838714d5 forth: improve execution model
My approach with RS was slightly wrong: RS' TOP was always containing current
IP. It worked, but it was problematic when came the time to introduce
RS-modifying words: it's impossible to modify RS in a word without immediately
messing your flow.

Therefore, what used to be RS' TOS has to be a variable that isn't changed
midway by RS-modifying words. I guess that's why RS is called *return* stack...
2020-03-13 16:01:09 -04:00
Virgil Dupras
a8e573c84a forth: add bin dict compilation stage!
Big one.

This allows us to write higher order words directly in Forth, which is much
more convenient than writing post-immediate (see "NOT" structure in diff if
you want to see what I mean) structures in ASM.

These structures can then be written to ROM (rather than loaded in RAM for
definitions loaded at run-time).

That's quite a bit of tooling that was added, 2 compilations stages, but I
think it's well worth it.
2020-03-12 00:14:44 -04:00
Virgil Dupras
e95614755b emul: add forth target 2020-03-09 22:26:02 -04:00
Virgil Dupras
49228e418c apps/forth: new (WIP) application 2020-03-07 12:13:15 -05:00
Virgil Dupras
72357fec86 Move "emul" folder to root 2019-12-31 13:34:24 -05:00