-: / /MOD SWAP DROP ;
-: MOD /MOD DROP ;
-: */ -ROT * SWAP / ;
-
-: NEGATE 0 SWAP - ;
-
-: TRUE -1 ;
-: FALSE 0 ;
-: NOT 0= ;
-
- \ 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 @ - ;
-
-: '\n' 10 ;
-: BL 32 ;
-
-: LITERAL IMMEDIATE ['] LIT , , ;
-
-: ':' [ CHAR : ] LITERAL ;
-: ';' [ CHAR ; ] LITERAL ;
-: '(' [ CHAR ( ] LITERAL ;
-: ')' [ CHAR ) ] LITERAL ;
-: '<' [ CHAR < ] LITERAL ;
-: '>' [ CHAR > ] LITERAL ;
-: '"' [ CHAR " ] LITERAL ;
-: 'A' [ CHAR A ] LITERAL ;
-: '0' [ CHAR 0 ] LITERAL ;
-: '-' [ CHAR - ] LITERAL ;
-: '.' [ CHAR . ] LITERAL ;
-
-: CR '\n' emit ;
-: SPACE BL emit ;
-
-: [COMPILE] IMMEDIATE
- WORD \ get the next word
- FIND \ find it in the dictionary
- >CFA \ get its codeword
- , \ and compile that
-;
-
-: RECURSE IMMEDIATE
- LATEST @ \ LATEST points to the word being compiled at the moment
- >CFA \ get the codeword
- , \ compile it
-;
-
-: DEBUGON TRUE DEBUG ! ;
-: DEBUGOFF FALSE DEBUG ! ;
-
-\ CONTROL STRUCTURES ----------------------------------------------------------------------
-
-: IF IMMEDIATE
- ['] 0BRANCH , \ compile 0BRANCH
- HERE @ \ save location of the offset on the stack
- 0 , \ compile a dummy offset
-;
-
-: THEN IMMEDIATE
- DUP
- HERE @ SWAP - \ calculate the offset from the address saved on the stack
- SWAP ! \ store the offset in the back-filled location
-;
-
-: ELSE IMMEDIATE
- ['] BRANCH , \ definite branch to just over the false-part
- HERE @ \ save location of the offset on the stack
- 0 , \ compile a dummy offset
- SWAP \ now back-fill the original (IF) offset
- DUP \ same as for THEN word above
- HERE @ SWAP -
- SWAP !
-;
-
-: BEGIN IMMEDIATE
- HERE @ \ save location on the stack
-;
-
-: UNTIL IMMEDIATE
- ['] 0BRANCH , \ compile 0BRANCH
- HERE @ - \ calculate the offset from the address saved on the stack
- , \ compile the offset here
-;
-
-: AGAIN IMMEDIATE
- ['] BRANCH , \ compile BRANCH
- HERE @ - \ calculate the offset back
- , \ compile the offset here
-;
-
-: WHILE IMMEDIATE
- ['] 0BRANCH , \ compile 0BRANCH
- HERE @ \ save location of the offset2 on the stack
- 0 , \ compile a dummy offset2
-;
-
-: REPEAT IMMEDIATE
- ['] BRANCH , \ compile BRANCH
- SWAP \ get the original offset (from BEGIN)
- HERE @ - , \ and compile it after BRANCH
- DUP
- HERE @ SWAP - \ calculate the offset2
- SWAP ! \ and back-fill it in the original location
-;
-
-: UNLESS IMMEDIATE
- ['] NOT , \ compile NOT (to reverse the test)
- [COMPILE] IF \ continue by calling the normal IF
-;
-
-: DO IMMEDIATE
- ['] LIT , -1 , [COMPILE] IF
- ['] >R , ['] >R ,
- ['] LIT , HERE @ 0 , ['] >R ,
- HERE @
-;
-
-: ?DO IMMEDIATE
- ['] 2DUP , ['] - , [COMPILE] IF
- ['] >R , ['] >R ,
- ['] LIT , HERE @ 0 , ['] >R ,
- HERE @
-;
-
-: I RSP@ 3 - @ ;
-
-: J RSP@ 6 - @ ;
-
-: ?LEAVE IMMEDIATE
- ['] 0BRANCH , 13 ,
- ['] R> , ['] RDROP , ['] RDROP ,
- ['] LIT , HERE @ 7 + , ['] DUP , ['] -ROT , ['] - , ['] SWAP , ['] ! ,
- ['] BRANCH ,
- 0 ,
-;
-
-: LEAVE IMMEDIATE
- ['] LIT , -1 ,
- [COMPILE] ?LEAVE
-;
-
-: +LOOP IMMEDIATE
- ['] DUP , \ Store copy of increment
-
- ['] R> , ['] SWAP , ['] R> , ['] SWAP , ['] R> , ['] SWAP , ['] + , ['] 2DUP , ['] - ,
- ['] SWAP , ['] >R , ['] SWAP , ['] >R , ['] SWAP , ['] >R ,
-
- \ Condition differently depending on sign of increment
- ['] SWAP , ['] 0>= , [COMPILE] IF
- ['] 0<= ,
- [COMPILE] ELSE
- ['] 0> ,
- [COMPILE] THEN
-
- \ Branch back to begining of loop kernel
- ['] 0BRANCH , HERE @ - ,
-
- \ Clean up
- ['] RDROP , ['] RDROP , ['] RDROP ,
-
- \ Record address of loop end for any LEAVEs to use
- HERE @ SWAP !
-
- [COMPILE] ELSE
- ['] 2DROP , \ Clean up if loop was entirely skipped (?DO)
- [COMPILE] THEN
-;
-
-: LOOP IMMEDIATE
- ['] LIT , 1 ,
- [COMPILE] +LOOP
-;
-
-
-\ CASE ------------------------------------------------------------------------
-
-: CASE IMMEDIATE
- 0 \ push 0 to mark the bottom of the stack
-;
-
-: OF IMMEDIATE
- ['] OVER , \ compile OVER
- ['] = , \ compile =
- [COMPILE] IF \ compile IF
- ['] DROP , \ compile DROP
-;
-
-: ENDOF IMMEDIATE
- [COMPILE] ELSE \ ENDOF is the same as ELSE
-;
-
-: ENDCASE IMMEDIATE
- ['] DROP , \ compile DROP
-
- \ keep compiling THEN until we get to our zero marker
- BEGIN
- ?DUP
- WHILE
- [COMPILE] THEN
- REPEAT
-;
-
-
-\ COMMENTS ----------------------------------------------------------------------
-
-: ( IMMEDIATE
- 1 \ allowed nested parens by keeping track of depth
- BEGIN
- KEY \ read next character
- DUP '(' = IF \ open paren?
- DROP \ drop the open paren
- 1+ \ depth increases
- ELSE
- ')' = IF \ close paren?
- 1- \ depth decreases
- THEN
- THEN
- DUP 0= UNTIL \ continue until we reach matching close paren, depth 0
- DROP \ drop the depth counter
-;
-
-( Some more complicated stack examples, showing the stack notation. )
-: NIP ( x y -- y ) SWAP DROP ;
-: TUCK ( x y -- y x y ) DUP -ROT ;
-: PICK ( x_u ... x_1 x_0 u -- x_u ... x_1 x_0 x_u )
- 1+ ( add one because of 'u' on the stack )
- PSP@ SWAP - ( add to the stack pointer )
- @ ( and fetch )
-;
-: ROLL ( x_u x_u-1... x_0 u -- x_u-1 ... x_0 x_u )
- 1+ DUP PICK SWAP ( x_u x_u-1 ... x_0 x_u u+1 )
- PSP@ 1- SWAP - PSP@ 2- SWAP
- DO
- i 1+ @ i !
- LOOP
- SWAP DROP
-;
-
-( With the looping constructs, we can now write SPACES, which writes n spaces to stdout. )
-: SPACES ( n -- )
- DUP 0> IF
- 0 DO SPACE LOOP
- ELSE
- DROP
- THEN
-;
-
-( Standard words for manipulating BASE. )
-: DECIMAL ( -- ) 10 BASE ! ;
-: HEX ( -- ) 16 BASE ! ;
-
-( Compute absolute value. )
-: ABS ( n -- |n| )
- dup 0< if
- negate
- then
-;
-
-: MAX ( n m -- max )
- 2dup - 0< if
- swap drop
- else
- drop
- then
-;
-
-: MIN ( n m -- max )
- 2dup - 0> if
- swap drop
- else
- drop
- then
-;
-
-( PRINTING NUMBERS ---------------------------------------------------------------------- )
-
-( This is the underlying recursive definition of U. )
-: U. ( u -- )
- BASE @ /MOD ( width rem quot )
- ?DUP IF ( if quotient <> 0 then )
- RECURSE ( print the quotient )
- THEN
-
- ( print the remainder )
- DUP 10 < IF
- '0' ( decimal digits 0..9 )
- ELSE
- 10 - ( hex and beyond digits A..Z )
- 'A'
- THEN
- +
- EMIT
-;
-
-( This word returns the width (in characters) of an unsigned number in the current base )
-: UWIDTH ( u -- width )
- BASE @ / ( rem quot )
- ?DUP IF ( if quotient <> 0 then )
- RECURSE 1+ ( return 1+recursive call )
- ELSE
- 1 ( return 1 )
- THEN
-;
-
-: U.R ( u width -- )
- SWAP ( width u )
- DUP ( width u u )
- UWIDTH ( width u uwidth )
- ROT ( u uwidth width )
- SWAP - ( u width-uwidth )
- ( At this point if the requested width is narrower, we'll have a negative number on the stack.
- Otherwise the number on the stack is the number of spaces to print. But SPACES won't print
- a negative number of spaces anyway, so it's now safe to call SPACES ... )
- SPACES
- ( ... and then call the underlying implementation of U. )
- U.
-;
-
-: .R ( n width -- )
- SWAP ( width n )
- DUP 0< IF
- NEGATE ( width u )
- 1 ( save a flag to remember that it was negative | width n 1 )
- -ROT ( 1 width u )
- SWAP ( 1 u width )
- 1- ( 1 u width-1 )
- ELSE
- 0 ( width u 0 )
- -ROT ( 0 width u )
- SWAP ( 0 u width )
- THEN
- SWAP ( flag width u )
- DUP ( flag width u u )
- UWIDTH ( flag width u uwidth )
- ROT ( flag u uwidth width )
- SWAP - ( flag u width-uwidth )
-
- SPACES ( flag u )
- SWAP ( u flag )
-
- IF ( was it negative? print the - character )
- '-' EMIT
- THEN
-
- U.
-;
-
-: . 0 .R SPACE ;
-
-: .S ( -- )
- '<' EMIT DEPTH U. '>' EMIT SPACE
- PSP0 @ 1+
- BEGIN
- DUP PSP@ 2 - <=
- WHILE
- DUP @ .
- 1+
- REPEAT
- DROP
-;
-
-: U. U. SPACE ;
-
-( ? fetches the integer at an address and prints it. )
-: ? ( addr -- ) @ . ;
-
-( c a b WITHIN returns true if a <= c and c < b )
-: WITHIN
- -ROT ( b c a )
- OVER ( b c a c )
- <= IF
- > IF ( b c -- )
- TRUE
- ELSE
- FALSE
- THEN
- ELSE
- 2DROP ( b c -- )
- FALSE
- THEN
-;
-
-
-( STRINGS ---------------------------------------------------------------------- )
-
-
-( Block copy, however, is important and novel: )
-: CMOVE ( src dest length -- )
-
- DUP 0<= IF
- EXIT
- THEN
-
- -ROT OVER - ( length src (dest-src) )
- -ROT DUP ROT + SWAP ( (dest-src) (src+length) src )
-
- DO
- I @ ( (dest-src) i@ )
- OVER I + ( (dest-src) i@ (dest-src+i) )
- ! ( (dest-src) )
- LOOP
-
- DROP
-;
-
-( C, appends a byte to the current compiled word. )
-: C,
- HERE @ C!
- 1 HERE +!
-;
-
-: S" IMMEDIATE ( -- addr len )
- STATE @ IF ( compiling? )
- ['] LITSTRING , ( compile LITSTRING )
- HERE @ ( save the address of the length word on the stack )
- 0 , ( dummy length - we don't know what it is yet )
- KEY DROP
- BEGIN
- KEY ( get next character of the string )
- DUP '"' <>
- WHILE
- C, ( copy character )
- REPEAT
- DROP ( drop the double quote character at the end )
- DUP ( get the saved address of the length word )
- HERE @ SWAP - ( calculate the length )
- 1- ( subtract 1 (because we measured from the start of the length word) )
- SWAP ! ( and back-fill the length location )
- ELSE ( immediate mode )
- HERE @ ( get the start address of the temporary space )
- KEY DROP
- BEGIN
- KEY
- DUP '"' <>
- WHILE
- OVER C! ( save next character )
- 1+ ( increment address )
- REPEAT
- DROP ( drop the final " character )
- HERE @ - ( calculate the length )
- HERE @ ( push the start address )
- SWAP ( addr len )
- THEN
-;
-
-: ." IMMEDIATE ( -- )
- [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 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 -- )
- 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 )
-;
-
-
-: VALUE ( n -- )
- WORD HEADER ( make the dictionary entry (the name follows VALUE) )
- DOCOL , ( append DOCOL )
- ['] LIT , ( append the codeword LIT )
- , ( append the initial value )
- ['] EXIT , ( append the codeword EXIT )
-;
-
-: TO IMMEDIATE ( n -- )
- WORD ( get the name of the value )
- FIND ( look it up in the dictionary )
- >DFA ( get a pointer to the first data field (the 'LIT') )
- 1+ ( increment to point at the value )
- STATE @ IF ( compiling? )
- ['] LIT , ( compile LIT )
- , ( compile the address of the value )
- ['] ! , ( compile ! )
- ELSE ( immediate mode )
- ! ( update it straightaway )
- THEN
-;
-
-( x +TO VAL adds x to VAL )
-: +TO IMMEDIATE
- WORD ( get the name of the value )
- FIND ( look it up in the dictionary )
- >DFA ( get a pointer to the first data field (the 'LIT') )
- 1+ ( increment to point at the value )
- STATE @ IF ( compiling? )
- ['] LIT , ( compile LIT )
- , ( compile the address of the value )
- ['] +! , ( compile +! )
- ELSE ( immediate mode )
- +! ( update it straightaway )
- 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 ------------------------------------------------------ )
-
-: ID.
- 1+ ( skip over the link pointer )
- DUP @ ( get the flags/length byte )
- F_LENMASK AND ( mask out the flags - just want the length )
-
- BEGIN
- DUP 0> ( length > 0? )
- WHILE
- SWAP 1+ ( addr len -- len addr+1 )
- DUP @ ( len addr -- len addr char | get the next character)
- DUP 32 >= OVER 127 <= AND IF
- EMIT ( len addr char -- len addr | and print it)
- ELSE
- BASE @ SWAP HEX
- ." \x" 0 .R
- BASE !
- THEN
- SWAP 1- ( len addr -- addr len-1 | subtract one from length )
- REPEAT
- 2DROP ( len addr -- )
-;
-
-: ?HIDDEN
- 1+ ( skip over the link pointer )
- @ ( get the flags/length byte )
- F_HIDDEN AND ( mask the F_HIDDEN flag and return it (as a truth value) )
-;
-: ?IMMEDIATE
- 1+ ( skip over the link pointer )
- @ ( get the flags/length byte )
- F_IMMED AND ( mask the F_IMMED flag and return it (as a truth value) )
-;
-
-: WORDS
- LATEST @ ( start at LATEST dictionary entry )
- BEGIN
- ?DUP ( while link pointer is not null )
- WHILE
- DUP ?HIDDEN NOT IF ( ignore hidden words )
- DUP ID. ( but if not hidden, print the word )
- SPACE
- THEN
- @ ( dereference the link pointer - go to previous word )
- REPEAT
- CR
-;
-
-
-( FORGET ---------------------------------------------------------------------- )
-
-: FORGET
- WORD FIND ( find the word, gets the dictionary entry address )
- DUP @ LATEST ! ( set LATEST to point to the previous word )
- HERE ! ( and store HERE with the dictionary address )
-;
-
-( DUMP ------------------------------------------------------------------------ )
-
-\ TODO!
-
-
-( DECOMPILER ------------------------------------------------------------------ )
-
-: CFA>
- LATEST @ ( start at LATEST dictionary entry )
- BEGIN
- ?DUP ( while link pointer is not null )
- WHILE
- 2DUP SWAP ( cfa curr curr cfa )
- < IF ( current dictionary entry < cfa? )
- NIP ( leave curr dictionary entry on the stack )
- EXIT
- THEN
- @ ( follow link pointer back )
- REPEAT
- DROP ( restore stack )
- 0 ( sorry, nothing found )
-;
-
-: SEE
- WORD FIND ( find the dictionary entry to decompile )
-
- ( Now we search again, looking for the next word in the dictionary. This gives us
- the length of the word that we will be decompiling. (Well, mostly it does). )
- HERE @ ( address of the end of the last compiled word )
- LATEST @ ( word last curr )
- BEGIN
- 2 PICK ( word last curr word )
- OVER ( word last curr word curr )
- <> ( word last curr word<>curr? )
- WHILE ( word last curr )
- NIP ( word curr )
- DUP @ ( word curr prev (which becomes: word last curr) )
- REPEAT
-
- 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 )
-
- 4 SPACES
-
- >DFA ( get the data address, ie. points after DOCOL | end-of-word start-of-data )
-
- ( now we start decompiling until we hit the end of the word )
- BEGIN ( end start )
- 2DUP >
- WHILE
- DUP @ ( end start codeword )
-
- CASE
- ['] LIT OF ( is it LIT ? )
- 1+ DUP @ ( get next word which is the integer constant )
- . ( and print it )
- ENDOF
- ['] LITSTRING OF ( is it LITSTRING ? )
- [ CHAR S ] LITERAL EMIT '"' EMIT SPACE ( print S"<space> )
- 1+ DUP @ ( get the length word )
- SWAP 1+ SWAP ( end start+1 length )
- 2DUP TELL ( print the string )
- '"' EMIT SPACE ( finish the string with a final quote )
- + ( end start+1+len, aligned )
- 1- ( because we're about to add 4 below )
- ENDOF
- ['] 0BRANCH OF ( is it 0BRANCH ? )
- ." 0BRANCH ( "
- 1+ DUP @ ( print the offset )
- .
- ." ) "
- ENDOF
- ['] BRANCH OF ( is it BRANCH ? )
- ." BRANCH ( "
- 1+ DUP @ ( print the offset )
- .
- ." ) "
- ENDOF
- ['] ['] OF ( is it ['] ? )
- ." ['] "
- 1+ DUP @ ( get the next codeword )
- CFA> ( and force it to be printed as a dictionary entry )
- ID. SPACE
- ENDOF
- ['] EXIT OF ( is it EXIT? )
- ( We expect the last word to be EXIT, and if it is then we don't print it
- because EXIT is normally implied by ;. EXIT can also appear in the middle
- of words, and then it needs to be printed. )
- 2DUP ( end start end start )
- 1+ ( end start end start+1 )
- <> IF ( end start | we're not at the end )
- ." EXIT "
- THEN
- ENDOF
- ( default case: )
- DUP ( in the default case we always need to DUP before using )
- CFA> ( look up the codeword to get the dictionary entry )
- ID. SPACE ( and print it )
- ENDCASE
-
- 1+ ( end start+1 )
- REPEAT
-
- ';' EMIT CR
-
- 2DROP ( restore stack )
-;
-
-
-( MEMORY ------------------------------------------------------------------ )
-
-: UNUSED ( -- cells )
- MEMSIZE HERE @ - ;
+: \ IMMEDIATE
+ #IB @ >IN !
+; \ We can now comment!
+
+\ Compile core definitions
+\ (These files must be compiled in order!)
+
+include lib_1_basic.4th
+include lib_2_control.4th
+include lib_3_input.4th
+include lib_4_comments.4th
+include lib_5_printnum.4th
+include lib_6_strings.4th
+include lib_7_variables.4th
+include lib_8_vocab.4th
+include lib_9_decompiler.4th
+include lib_10_misc.4th
+include lib_11_extensions.4th
+
+: LICENSE
+ CR
+ ." This program is free software: you can redistribute it and/or modify" CR
+ ." it under the terms of the GNU General Public License as published by" CR
+ ." the Free Software Foundation, either version 3 of the License, or" CR
+ ." (at your option) any later version." CR
+ ." " CR
+ ." This program is distributed in the hope that it will be useful," CR
+ ." but WITHOUT ANY WARRANTY; without even the implied warranty of" CR
+ ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" CR
+ ." GNU General Public License for more details." CR
+ ." " CR
+ ." You should have received a copy of the GNU General Public License" CR
+ ." along with this program. If not, see http://www.gnu.org/licenses/." CR
+;
+
+: WELCOME
+ SKIP-WELCOME @ INVERT IF
+ ." Welcome to forth.jl!" CR CR
+
+ ." Copyright (C) 2016 Tim Vaughan" CR
+ ." This program comes with ABSOLUTELY NO WARRANY; for details type 'license'" CR
+ ." Type 'bye' or press Ctrl+D to exit." CR CR
+ THEN
+;
+welcome
The Lambda Lab / projects / forth.jl.git / blobdiff