mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-25 18:08:05 +11:00
forth: Add "DO" and "LOOP"
Also, un-IMMEDIATE "LITN" it didn't make any sense.
This commit is contained in:
parent
587d1d0d69
commit
d874f20278
@ -3,7 +3,7 @@
|
||||
: +! SWAP OVER @ + SWAP ! ;
|
||||
: ALLOT HERE +! ;
|
||||
: C, H C! 1 ALLOT ;
|
||||
: COMPILE ' ['] LITN EXECUTE ['] , , ; IMMEDIATE
|
||||
: COMPILE ' LITN ['] , , ; IMMEDIATE
|
||||
: BEGIN H ; IMMEDIATE
|
||||
: AGAIN COMPILE (bbr) H -^ C, ; IMMEDIATE
|
||||
: UNTIL COMPILE SKIP? COMPILE (bbr) H -^ C, ; IMMEDIATE
|
||||
@ -15,9 +15,7 @@
|
||||
input buffer size in Collapse OS
|
||||
|
||||
COMPILE; Tough one. Get addr of caller word (example above
|
||||
(bbr)) and then call LITN on it. However, LITN is an
|
||||
immediate and has to be indirectly executed. Then, write
|
||||
a reference to "," so that this word is written to HERE.
|
||||
(bbr)) and then call LITN on it.
|
||||
|
||||
NOT: a bit convulted because we don't have IF yet )
|
||||
|
||||
@ -49,3 +47,20 @@
|
||||
: > CMP 1 = ;
|
||||
: / /MOD SWAP DROP ;
|
||||
: MOD /MOD DROP ;
|
||||
|
||||
( In addition to pushing H this compiles 2 >R so that loop variables are sent
|
||||
to PS at runtime )
|
||||
: DO
|
||||
COMPILE SWAP COMPILE >R COMPILE >R
|
||||
H
|
||||
; IMMEDIATE
|
||||
|
||||
( One could think that we should have a sub word to avoid all these COMPILE,
|
||||
but we can't because otherwise it messes with the RS )
|
||||
: LOOP
|
||||
COMPILE R> 1 LITN COMPILE + COMPILE DUP COMPILE >R
|
||||
COMPILE I' COMPILE = COMPILE SKIP? COMPILE (bbr)
|
||||
H -^ C,
|
||||
COMPILE R> COMPILE DROP COMPILE R> COMPILE DROP
|
||||
; IMMEDIATE
|
||||
|
||||
|
@ -444,7 +444,7 @@ ISIMMED:
|
||||
.db "LITN"
|
||||
.fill 3
|
||||
.dw ISIMMED
|
||||
.db 1 ; IMMEDIATE
|
||||
.db 0
|
||||
LITN:
|
||||
.dw nativeWord
|
||||
ld hl, (HERE)
|
||||
|
@ -50,7 +50,7 @@ CONSTANT x n -- Creates cell x that when called pushes its value
|
||||
DOES> -- See description at top of file
|
||||
IMMED? a -- f Checks whether wordref at a is immediate.
|
||||
IMMEDIATE -- Flag the latest defined word as immediate.
|
||||
LITN n -- *I* Inserts number from TOS as a literal
|
||||
LITN n -- Write number n as a literal.
|
||||
VARIABLE c -- Creates cell x with 2 bytes allocation.
|
||||
|
||||
Compilation vs meta-compilation. When you compile a word with "[COMPILE] foo",
|
||||
|
Loading…
Reference in New Issue
Block a user