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forth: add "VARIABLE"

This commit is contained in:
Virgil Dupras 2020-03-07 22:23:08 -05:00
parent 989d8bbabf
commit 5cadde557c
2 changed files with 14 additions and 2 deletions
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13
apps/forth/dict.asm
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@ -430,11 +430,22 @@ ALLOT:
.dw STOREINC+CODELINK_OFFSET .dw STOREINC+CODELINK_OFFSET
.dw EXIT+CODELINK_OFFSET .dw EXIT+CODELINK_OFFSET
; CREATE 2 ALLOT
VARIABLE:
.db "VARIABLE"
.dw ALLOT
.dw compiledWord
.dw CREATE+CODELINK_OFFSET
.dw NUMBER
.dw 2
.dw ALLOT+CODELINK_OFFSET
.dw EXIT+CODELINK_OFFSET
; ( n -- ) ; ( n -- )
; CREATE HERE @ ! DOES> @ ; CREATE HERE @ ! DOES> @
CONSTANT: CONSTANT:
.db "CONSTANT" .db "CONSTANT"
.dw ALLOT .dw VARIABLE
.dw compiledWord .dw compiledWord
.dw CREATE+CODELINK_OFFSET .dw CREATE+CODELINK_OFFSET
.dw HERE_+CODELINK_OFFSET .dw HERE_+CODELINK_OFFSET

3
apps/forth/dictionary.txt
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@ -25,7 +25,7 @@ DOES>: Used inside a colon definition that itself uses CREATE, DOES> transforms
- a b -- c a - b -> c - a b -- c a - b -> c
* a b -- c a * b -> c * a b -- c a * b -> c
/ a b -- c a / b -> c / a b -- c a / b -> c
CREATE x -- Create cell named x CREATE x -- Create cell named x. Doesn't allocate a PF.
DOES> -- See description at top of file DOES> -- See description at top of file
DUP a -- a a DUP a -- a a
EMIT c -- Spit char c to stdout EMIT c -- Spit char c to stdout
@ -45,3 +45,4 @@ SWAP a b -- b a
+! n a -- Increase value of addr a by n +! n a -- Increase value of addr a by n
ALLOT n -- Move HERE by n bytes ALLOT n -- Move HERE by n bytes
CONSTANT x n -- Creates cell x that when called pushes its value CONSTANT x n -- Creates cell x that when called pushes its value
VARIABLE c -- Creates cell x with 2 bytes allocation.