: FALSE 0 ;
: NOT 0= ;
-: CELLS ; \ Allow for slightly more portable code
+ \ Allow for slightly more portable code
+: CELLS ;
+
+\ Since the smallest unit of memory in our system is 64 bits and since strings
+\ are stored as arrays of 64 bit integers, the character store/fetch words are
+\ just aliases of the standard store/fetch words.
+: C! ! ;
+: C@ @ ;
+: C, , ;
: DEPTH PSP@ PSP0 @ - ;
( STRINGS ---------------------------------------------------------------------- )
-( Since the smallest unit of memory in our system is 64 bits and since strings
- are stored as arrays of 64 bit integers, the character store/fetch words are
- just aliases of the standard store/fetch words. )
-: C! ! ;
-: C@ @ ;
( Block copy, however, is important and novel: )
: CMOVE ( src dest length -- )
;
: ." IMMEDIATE ( -- )
- STATE @ IF ( compiling? )
- [COMPILE] S" ( read the string, and compile LITSTRING, etc. )
- ['] TELL , ( compile the final TELL )
- ELSE
- ( In immediate mode, just read characters and print them until we get
- to the ending double quote. )
- KEY DROP
- BEGIN
- KEY
- DUP '"' = IF
- DROP ( drop the double quote character )
- EXIT ( return from this function )
- THEN
- EMIT
- AGAIN
- THEN
+ [COMPILE] S" ( read the string, and compile LITSTRING, etc. )
+ ['] TELL , ( compile the final TELL )
+;
+
+: .(
+ KEY DROP
+ BEGIN
+ KEY
+ DUP ')' = IF
+ DROP ( drop the double quote character )
+ EXIT ( return from this function )
+ THEN
+ EMIT
+ AGAIN
;
( CONSTANTS AND VARIABLES ------------------------------------------------------ )
: CONSTANT
- WORD ( get the name (the name follows CONSTANT) )
- CREATE ( make the dictionary entry )
+ WORD HEADER ( make dictionary entry (the name follows CONSTANT) )
DOCOL , ( append DOCOL (the codeword field of this word) )
['] LIT , ( append the codeword LIT )
, ( append the value on the top of the stack )
['] EXIT , ( append the codeword EXIT )
;
-: ALLOT ( n -- addr )
- HERE @ SWAP ( here n )
+: ALLOT ( n -- )
HERE +! ( adds n to HERE, after this the old value of HERE is still on the stack )
;
: VARIABLE
+ CREATE
1 CELLS ALLOT ( allocate 1 cell of memory, push the pointer to this memory )
- WORD CREATE ( make the dictionary entry (the name follows VARIABLE) )
- DOCOL , ( append DOCOL (the codeword field of this word) )
- ['] LIT , ( append the codeword LIT )
- , ( append the pointer to the new memory )
- ['] EXIT , ( append the codeword EXIT )
;
: VALUE ( n -- )
- WORD CREATE ( make the dictionary entry (the name follows VALUE) )
+ WORD HEADER ( make the dictionary entry (the name follows VALUE) )
DOCOL , ( append DOCOL )
['] LIT , ( append the codeword LIT )
, ( append the initial value )
THEN
;
+( Fill u ints, starting at a, with the value b )
+: FILL ( a u b -- )
+ -ROT OVER + SWAP ?DO
+ DUP I !
+ LOOP
+ DROP
+;
+
+: ERASE ( a u -- )
+ 0 FILL
+;
( PRINTING THE DICTIONARY ------------------------------------------------------ )
DROP ( at this point, the stack is: start-of-word end-of-word )
SWAP ( end-of-word start-of-word )
+ DUP >CFA @ CASE
+ DOCOL OF
+ \ Colon definition
+ ':' EMIT SPACE DUP ID. SPACE
+ DUP ?IMMEDIATE IF ." IMMEDIATE " THEN CR
+ ENDOF
+ DOVAR OF
+ \ Variable definition
+ ." Variable " DUP ID. CR
+ 2DROP EXIT
+ ENDOF
+ DOCON OF
+ \ Constant definition
+ ." Constant " DUP ID. CR
+ 2DROP EXIT
+ ENDOF
+
+ \ Unknown codeword
+ ." Primitive or word with unrecognized codeword." CR
+ DROP 2DROP EXIT
+ ENDCASE
+
( begin the definition with : NAME [IMMEDIATE] )
- ':' EMIT SPACE DUP ID. SPACE
- DUP ?IMMEDIATE IF ." IMMEDIATE " THEN CR 4
+ ( ':' EMIT SPACE DUP ID. SPACE
+ DUP ?IMMEDIATE IF ." IMMEDIATE " THEN CR 4 )
+
+ 4 SPACES
>DFA ( get the data address, ie. points after DOCOL | end-of-word start-of-data )
;
-( WELCOME MESSAGE ------------------------------------------------------------- )
-
-CR CR ." --- TimForth initialized --- "
-
+( MEMORY ------------------------------------------------------------------ )
+: UNUSED ( -- cells )
+ MEMSIZE HERE @ - ;