/****************************************************************************** * Copyright (c) 2004, 2008 IBM Corporation * All rights reserved. * This program and the accompanying materials * are made available under the terms of the BSD License * which accompanies this distribution, and is available at * http://www.opensource.org/licenses/bsd-license.php * * Contributors: * IBM Corporation - initial implementation *****************************************************************************/ // ============================================================================ // ============================================================================ // // Copyright 2002,2003,2004 Segher Boessenkool // // This is the core engine of Paflof. It is almost ANS Forth compatible. // There are two possibilities why an aspect would not be: // a) Open Firmware requires different semantics; // b) bugs. // Most of the "extended" semantics defined in the OF specification are // not implemented; just the bare essentials. For example, you can't // use structural words (IF, THEN, BEGIN, etc.) or return-stack // manipulation words (R> etc.) in the interpreter. // The data stack pointer. raw(HERE DOVAL _A(the_mem)) // Some common constant numbers; smaller and faster if they are defined // as constants, than when inlined as a literal. con(-1 -1) con(0 0) con(1 1) con(2 2) con(3 3) con(4 4) con(8 8) con(H#10 0x10) con(H#20 0x20) con(H#FF 0xff) con(H#FFFF 0xffff) con(H#FFFFFFFF 0xffffffff) con(D#10 0x0a) // Manipulating different kinds of addresses. con(/C 1) con(/W 2) con(/L 4) con(/X 8) con(/N CELLSIZE) con(CELL CELLSIZE) col(/C* /C *) col(/W* /W *) col(/L* /L *) col(/X* /X *) col(/N* /N *) col(CA+ /C* +) col(WA+ /W* +) col(LA+ /L* +) col(XA+ /X* +) col(NA+ /N* +) col(CA1+ /C +) col(WA1+ /W +) col(LA1+ /L +) col(XA1+ /X +) col(NA1+ /N +) col(CHAR+ CA1+) col(CELL+ NA1+) col(CHAR- /C -) col(CELL- /N -) col(CHARS /C*) col(CELLS /N*) col(CHARS+ CA+) col(CELLS+ NA+) // Run-time words for TO and for string literals. col(DOTO R> CELL+ DUP >R @ CELL+ !) col(SLITERAL R> CELL+ DUP DUP C@ + LIT(-CELLSIZE) AND >R) // Stack manipulation. col(?DUP DUP 0BRANCH(1) DUP) col(TUCK SWAP OVER) col(2DUP OVER OVER) col(3DUP 2 PICK 2 PICK 2 PICK) col(2OVER 3 PICK 3 PICK) col(2DROP DROP DROP) col(3DROP DROP DROP DROP) col(NIP SWAP DROP) col(CLEAR 0 DEPTH!) col(ROT >R SWAP R> SWAP) col(-ROT SWAP >R SWAP R>) col(2SWAP >R -ROT R> -ROT) col(2ROT >R >R 2SWAP R> R> 2SWAP) col(ROLL DUP ?DUP 0BRANCH(6) ROT >R 1 - BRANCH(-9) ?DUP 0BRANCH(6) R> -ROT 1 - BRANCH(-9)) col(-ROLL DUP ?DUP 0BRANCH(9) >R ROT R> SWAP >R 1 - BRANCH(-12) ?DUP 0BRANCH(6) R> SWAP 1 - BRANCH(-9)) col(2>R R> ROT >R SWAP >R >R) col(2R> R> R> R> ROT >R SWAP) col(2R@ R> R> R@ OVER >R ROT >R SWAP) cod(?PICK) // Arithmetic. col(2* 1 LSHIFT) col(U2/ 1 RSHIFT) col(2/ 1 ASHIFT) col(<< LSHIFT) col(>> RSHIFT) col(>>A ASHIFT) col(INVERT -1 XOR) col(NOT INVERT) // Booleans. con(TRUE -1) con(FALSE 0) // Comparisons. col(> SWAP <) col(U> SWAP U<) col(<= > 0=) col(<> = 0=) col(>= < 0=) col(0<= 0 <=) col(0<> 0 <>) col(0> 0 >) col(0>= 0 >=) col(U<= U> 0=) col(U>= U< 0=) col(WITHIN ROT DUP ROT >= 0BRANCH(3) 2DROP FALSE EXIT > 0BRANCH(2) FALSE EXIT TRUE) col(BETWEEN 1 + WITHIN) // Double-cell single-bit shifts. col(D2* 2* OVER 0< - >R 2* R>) col(UD2/ >R U2/ R@ LIT(8*CELLSIZE-1) LSHIFT OR R> U2/) col(D2/ >R U2/ R@ LIT(8*CELLSIZE-1) LSHIFT OR R> 2/) // More arithmetic. col(NEGATE 0 SWAP -) col(ABS DUP 0< 0BRANCH(1) NEGATE) col(MAX 2DUP < 0BRANCH(1) SWAP DROP) col(MIN 2DUP > 0BRANCH(1) SWAP DROP) col(U* *) col(1+ 1 +) col(1- 1 -) col(2+ 2 +) col(2- 2 -) col(EVEN 1+ -1 AND) col(BOUNDS OVER + SWAP) // Double-cell and mixed-size arithmetic. col(S>D DUP 0<) col(DNEGATE INVERT >R NEGATE DUP 0= R> SWAP -) col(DABS DUP 0< 0BRANCH(1) DNEGATE) col(M+ SWAP >R DUP >R + DUP R> U< R> SWAP -) col(D+ >R M+ R> +) col(D- DNEGATE D+) col(*' >R DUP 0< >R D2* R> 0BRANCH(2) R@ M+ R>) col(UM* 0 -ROT LIT(8*CELLSIZE) 0 DODO *' DOLOOP(-3) DROP) col(M* 2DUP XOR >R >R ABS R> ABS UM* R> 0< 0BRANCH(1) DNEGATE) col(/' >R DUP 0< >R D2* R> OVER R@ U>= OR 0BRANCH(6) >R 1 OR R> R@ - R>) col(UM/MOD LIT(8*CELLSIZE) 0 DODO /' DOLOOP(-3) DROP SWAP) col(SM/REM OVER >R >R DABS R@ ABS UM/MOD R> 0< 0BRANCH(1) NEGATE R> 0< 0BRANCH(4) NEGATE SWAP NEGATE SWAP) col(FM/MOD DUP >R 2DUP XOR 0< >R SM/REM OVER 0<> R> AND 0BRANCH(6) 1- SWAP R> + SWAP EXIT R> DROP) // Division. col(U/MOD 0 SWAP UM/MOD) col(/MOD >R S>D R> FM/MOD) col(/ /MOD NIP) col(MOD /MOD DROP) col(*/MOD >R M* R> FM/MOD) col(*/ */MOD NIP) // Splitting, joining, flipping the components of a number. col(WBSPLIT DUP H#FF AND SWAP 8 RSHIFT) col(LWSPLIT DUP H#FFFF AND SWAP H#10 RSHIFT) col(XLSPLIT DUP H#FFFFFFFF AND SWAP H#20 RSHIFT) col(LBSPLIT LWSPLIT >R WBSPLIT R> WBSPLIT) col(XWSPLIT XLSPLIT >R LWSPLIT R> LWSPLIT) col(XBSPLIT XLSPLIT >R LBSPLIT R> LBSPLIT) col(BWJOIN 8 LSHIFT OR) col(WLJOIN H#10 LSHIFT OR) col(BLJOIN BWJOIN >R BWJOIN R> WLJOIN) col(WBFLIP WBSPLIT SWAP BWJOIN) col(LWFLIP LWSPLIT SWAP WLJOIN) col(LXJOIN H#20 LSHIFT OR) col(XLFLIP XLSPLIT SWAP LXJOIN) col(LBFLIP LBSPLIT SWAP 2SWAP SWAP BLJOIN) col(WXJOIN WLJOIN >R WLJOIN R> LXJOIN) col(XWFLIP XWSPLIT SWAP 2SWAP SWAP WXJOIN) col(BXJOIN BLJOIN >R BLJOIN R> LXJOIN) col(XBFLIP XLSPLIT LBFLIP SWAP LBFLIP LXJOIN) // Aligning to cell size. col(ALIGNED /N 1- + /N NEGATE AND) // Counted loop stuff. col(I R> R@ SWAP >R) col(J R> R> R> R@ SWAP >R SWAP >R SWAP >R) col(UNLOOP R> R> R> 2DROP >R) // Memory accesses. col(+! TUCK @ + SWAP !) cod(COMP) col(OFF FALSE SWAP !) col(ON TRUE SWAP !) col(= 0BRANCH(3) LIT(0x10000) -) col(2@ DUP CELL+ @ SWAP @) col(2! DUP >R ! R> CELL+ !) col(WBFLIPS BOUNDS DO?DO(8) I W@ WBFLIP I W! /W DO+LOOP(-8)) col(LWFLIPS BOUNDS DO?DO(8) I L@ LWFLIP I L! /L DO+LOOP(-8)) col(LBFLIPS BOUNDS DO?DO(8) I L@ LBFLIP I L! /L DO+LOOP(-8)) col(XBFLIPS BOUNDS DO?DO(8) I X@ XBFLIP I X! /X DO+LOOP(-8)) col(XWFLIPS BOUNDS DO?DO(8) I X@ XWFLIP I X! /X DO+LOOP(-8)) col(XLFLIPS BOUNDS DO?DO(8) I X@ XLFLIP I X! /X DO+LOOP(-8)) cod(FILL) col(BLANK LIT(0x20) FILL) col(ERASE LIT(0x00) FILL) // Exception handling. var(CATCHER 0) var(ABORT"-STR 0) col(CATCH DEPTH >R CATCHER @ >R RDEPTH CATCHER ! EXECUTE R> CATCHER ! R> DROP 0) col(THROW ?DUP 0BRANCH(12) CATCHER @ RDEPTH! R> CATCHER ! R> SWAP >R DEPTH! DROP R>) col(ABORT -1 THROW) // Text input. var(#TIB TIBSIZE) val(IB 0) var(#IB 0) val(SOURCE-ID 0) col(SOURCE IB #IB @) var(>IN 0) col(TERMINAL TIB DOTO IB #TIB @ #IB ! 0 DOTO SOURCE-ID) // ASCII codes. con(BL 0x20) con(BELL 7) con(BS 8) con(CARRET 0x0d) con(LINEFEED 0x0a) // Text output. dfr(EMIT) dfr(CR) col(TYPE BOUNDS DO?DO(5) I C@ EMIT DOLOOP(-5)) col(LL-CR CARRET EMIT LINEFEED EMIT) col(SPACE BL EMIT) col(SPACES 0 DO?DO(3) SPACE DOLOOP(-3)) // Text manipulation. col(COUNT DUP CHAR+ SWAP C@) col(PACK DUP >R 1+ SWAP DUP R@ C! MOVE R>) col(UPC DUP LIT('a') LIT('z') BETWEEN 0BRANCH(3) LIT(0x20) - ) col(LCC DUP LIT('A') LIT('Z') BETWEEN 0BRANCH(3) LIT(0x20) + ) // Text input. dfr(KEY) dfr(KEY?) dfr(ACCEPT) var(SPAN 0) col(EXPECT ACCEPT SPAN !) col(REFILL SOURCE-ID 0= 0BRANCH(7) SOURCE EXPECT 0 >IN ! TRUE EXIT SOURCE-ID -1 = 0BRANCH(2) FALSE EXIT LIT(0x6502) THROW) // Number base. var(BASE 16) col(DECIMAL D#10 BASE !) col(HEX H#10 BASE !) col(OCTAL 8 BASE !) // Pictured numeric output. col(PAD HERE LIT(256) +) col(TODIGIT DUP LIT(9) > 0BRANCH(3) LIT(0x27) + LIT(0x30) +) col(MU/MOD DUP >R U/MOD R> SWAP >R UM/MOD R>) col(<# PAD DUP !) col(HOLD PAD DUP @ 1- TUCK SWAP ! C!) col(SIGN 0< 0BRANCH(3) LIT('-') HOLD) col(# BASE @ MU/MOD ROT TODIGIT HOLD) col(#S # 2DUP OR 0BRANCH(2) BRANCH(-7)) col(#> 2DROP PAD DUP @ TUCK -) col((.) <# DUP >R ABS 0 #S R> SIGN #>) col(U# BASE @ U/MOD SWAP TODIGIT HOLD) col(U#S U# DUP 0BRANCH(2) BRANCH(-6)) col(U#> DROP PAD DUP @ TUCK -) col((U.) <# U#S U#>) col(. (.) TYPE SPACE) col(S. .) col(U. (U.) TYPE SPACE) col(.R SWAP (.) ROT 2DUP < 0BRANCH(5) OVER - SPACES BRANCH(1) DROP TYPE) col(U.R SWAP (U.) ROT 2DUP < 0BRANCH(5) OVER - SPACES BRANCH(1) DROP TYPE) col(.D BASE @ SWAP DECIMAL . BASE !) col(.H BASE @ SWAP HEX . BASE !) col(.S DEPTH DUP 0< 0BRANCH(2) DROP EXIT 0 DO?DO(8) DEPTH I - 1- PICK . DOLOOP(-8)) col(? @ .) // Numeric input. col(DIGIT OVER UPC DUP LIT('A') LIT('Z') BETWEEN 0BRANCH(3) LIT(7) - LIT(0x30) - DUP ROT 0 SWAP WITHIN 0BRANCH(4) NIP TRUE BRANCH(2) DROP FALSE) col(>NUMBER DUP 0= 0BRANCH(1) EXIT OVER C@ BASE @ DIGIT 0BRANCH(23) SWAP >R SWAP >R >R BASE @ U* SWAP BASE @ UM* ROT + R> 0 D+ R> CHAR+ R> 1- BRANCH(-35) DROP) col($NUMBER DUP 0= 0BRANCH(4) DROP DROP TRUE EXIT >R DUP >R C@ LIT('-') = DUP 0BRANCH(15) R> CHAR+ R> 1- DUP 0= 0BRANCH(5) DROP DROP DROP TRUE EXIT >R >R 0 0 R> R> >NUMBER NIP 0= 0BRANCH(7) DROP SWAP 0BRANCH(1) NEGATE FALSE EXIT DROP DROP DROP TRUE) // Data space allocation. col(ALLOT HERE + DOTO HERE) col(, HERE ! /N ALLOT) col(C, HERE C! /C ALLOT) col(W, HERE W! /W ALLOT) col(L, HERE L! /L ALLOT) col(X, HERE X! /X ALLOT) col(ALIGN HERE /N 1- AND 0BRANCH(4) 0 C, BRANCH(-10)) col(PLACE 2DUP C! CHAR+ SWAP CHARS BOUNDS DO?DO(9) DUP C@ I C! CHAR+ 1 CHARS DO+LOOP(-9) DROP) col(STRING, HERE OVER 1+ CHARS ALLOT PLACE) // Every language needs a no-op. col(NOOP) // Now it gets ugly: search-order and word-lisst infrastructure. raw(FORTH-WORDLIST DODOES _A(xt_NOOP+2+(8/sizeof(long))) _A(0) _A(0)) // Engine initialisation will set this last cell to the xt of LASTWORD. // compilation dictionary raw(CURRENT DOVAL _A(xt_FORTH_X2d_WORDLIST+3+(16/sizeof(long)))) // +7 for 32-bit, +5 for 64-bit col(LAST CURRENT CELL+) // for context dictionaries raw(SEARCH-ORDER DOVAR _A(xt_FORTH_X2d_WORDLIST+3+(16/sizeof(long))) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0)) // +7 for 32-bit, +5 for 64-bit // for context dictionaries //raw(SEARCH-ORDER DOVAR _A(xt_FORTH_X2d_WORDLIST+3+(sizeof(" FORTH-WORDLIST")/sizeof(long))) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0) _A(0)) // +7 for 32-bit, +5 for 64-bit raw(CONTEXT DOVAL _A(xt_SEARCH_X2d_ORDER+2+(16/sizeof(long)))) //raw(CONTEXT DOVAL _A(xt_SEARCH_X2d_ORDER+6)) // +6 for 32-bit, +4 for 64-bit // Dictionary structure. col(LINK>NAME CELL+) col(NAME> CHAR+ DUP C@ 1+ CHARS+ ALIGNED) col(LINK> LINK>NAME NAME>) col(NAME>STRING CHAR+ COUNT) // Creating word headers. var(LATEST 0) dfr((REVEAL)) col(HEADER ALIGN HERE LAST @ , LATEST ! 0 C, STRING, ALIGN) col(REVEAL LATEST @ LINK>NAME NAME>STRING (REVEAL) LATEST @ LAST !) // Finding words. cod(STRING=CI) // (find) ( str len head -- 0 | link ) dfr((FIND)) col(((FIND)) DUP 0BRANCH(15) >R 2DUP R@ LINK>NAME NAME>STRING STRING=CI 0BRANCH(3) 2DROP R> EXIT R> @ BRANCH(-18) 3DROP FALSE) col((FIND-ORDER) CONTEXT DUP >R SEARCH-ORDER U>= 0BRANCH(18) 2DUP R@ @ CELL+ @ (FIND) ?DUP 0BRANCH(5) NIP NIP R> DROP EXIT R> CELL- BRANCH(-24) R> 3DROP 0) col(($FIND) (FIND-ORDER) DUP 0BRANCH(6) LINK>NAME DUP NAME> SWAP C@ TRUE) col($FIND 2DUP ($FIND) 0BRANCH(6) DROP NIP NIP TRUE BRANCH(1) FALSE) // Flags on words. con('IMMEDIATE 1) col(IMMEDIATE? 'IMMEDIATE AND 0<>) col(IMMEDIATE LAST @ CELL+ DUP C@ 'IMMEDIATE OR SWAP C!) // Parsing. col(FINDCHAR SWAP 0 DO?DO(24) OVER I + C@ OVER DUP BL = 0BRANCH(3) <= BRANCH(1) = 0BRANCH(6) I UNLOOP NIP NIP TRUE EXIT DOLOOP(-24) DROP DROP FALSE) col(PARSE >R IB >IN @ + SPAN @ >IN @ - 2DUP R> FINDCHAR 0BRANCH(6) NIP DUP 1 + BRANCH(1) DUP >IN +!) col(SKIPWS IB SPAN @ DUP >IN @ > 0BRANCH(14) OVER >IN @ + C@ BL <= 0BRANCH(5) 1 >IN +! BRANCH(-20) DROP DROP) col(PARSE-WORD SKIPWS BL PARSE) var(WHICHPOCKET 0) // We reserved 0x1000 for the pockets. So we have 16 pockets a 0x100 col(POCKET POCKETS WHICHPOCKET @ LIT(POCKETSIZE) * + WHICHPOCKET @ 1 + DUP LIT(NUMPOCKETS) = 0BRANCH(2) DROP 0 WHICHPOCKET !) col(WORD POCKET >R PARSE DUP R@ C! BOUNDS R> DUP 2SWAP DO?DO(7) CHAR+ I C@ OVER C! DOLOOP(-7) DROP) // Some simple parsing words. col(CHAR PARSE-WORD DROP C@) imm(( LIT(')') PARSE 2DROP) // Removing comments out of the code, the code from the backslash to the next \n is removed. // We need to start from cursor -1 (the backslash) to handle the case backslash+linefeed correctly 0x5c0a imm(\ >IN @ 1- >IN ! LINEFEED PARSE 2DROP) // The compiler infrastructure. var(STATE 0) imm([ STATE OFF) col(] LIT(0x100) STATE !) col(?COMP STATE @ 0BRANCH(1) EXIT LIT(-134) THROW) col(COMPILE, ,) col(: PARSE-WORD HEADER DOTICK DOCOL COMPILE, ]) col(:NONAME ALIGN HERE DOTICK DOCOL COMPILE, ]) imm(; ?COMP DOTICK SEMICOLON COMPILE, REVEAL [) // Compiling strings. imm(C" ?COMP LIT('"') PARSE DOTICK SLITERAL COMPILE, DUP C, BOUNDS DO?DO(5) I C@ C, DOLOOP(-5) ALIGN) imm(S" STATE @ 0BRANCH(5) C" DOTICK COUNT COMPILE, EXIT LIT('"') PARSE DUP >R POCKET DUP >R SWAP MOVE R> R>) imm(Z" S" 2DUP + 0 SWAP C! DROP) imm(." STATE @ 0BRANCH(5) S" DOTICK TYPE COMPILE, EXIT LIT('"') PARSE TYPE) imm(.( LIT(')') PARSE TYPE) col(COMPILE R> CELL+ DUP @ COMPILE, >R) var(THERE 0) col(+COMP STATE @ 1 STATE +! 0BRANCH(1) EXIT HERE THERE ! COMP-BUFFER DOTO HERE COMPILE DOCOL) col(-COMP -1 STATE +! STATE @ 0BRANCH(1) EXIT COMPILE EXIT THERE @ DOTO HERE COMP-BUFFER EXECUTE) // Structure words. col(RESOLVE-ORIG HERE OVER CELL+ - SWAP !) imm(AHEAD +COMP DOTICK DOBRANCH COMPILE, HERE 0 COMPILE,) imm(IF +COMP DOTICK DO0BRANCH COMPILE, HERE 0 COMPILE,) imm(THEN ?COMP RESOLVE-ORIG -COMP) imm(ELSE ?COMP DOTICK DOBRANCH COMPILE, HERE 0 COMPILE, SWAP RESOLVE-ORIG) imm(CASE +COMP 0) imm(ENDCASE ?COMP DOTICK DROP COMPILE, ?DUP 0BRANCH(5) 1- SWAP THEN BRANCH(-8) -COMP) imm(OF ?COMP 1+ >R DOTICK OVER COMPILE, DOTICK = COMPILE, IF DOTICK DROP COMPILE, R>) imm(ENDOF ?COMP >R ELSE R>) col(RESOLVE-DEST HERE CELL+ - COMPILE,) imm(BEGIN +COMP HERE) imm(AGAIN ?COMP DOTICK DOBRANCH COMPILE, RESOLVE-DEST -COMP) imm(UNTIL ?COMP DOTICK DO0BRANCH COMPILE, RESOLVE-DEST -COMP) imm(WHILE ?COMP IF SWAP) imm(REPEAT ?COMP AGAIN THEN) // Counted loops. var(LEAVES 0) col(RESOLVE-LOOP LEAVES @ ?DUP 0BRANCH(10) DUP @ SWAP HERE OVER - SWAP ! BRANCH(-13) HERE - COMPILE, LEAVES !) imm(DO +COMP LEAVES @ HERE DOTICK DODO COMPILE, 0 LEAVES !) imm(?DO +COMP LEAVES @ DOTICK DODO?DO COMPILE, HERE HERE LEAVES ! 0 COMPILE,) imm(LOOP ?COMP DOTICK DODOLOOP COMPILE, RESOLVE-LOOP -COMP) imm(+LOOP ?COMP DOTICK DODO+LOOP COMPILE, RESOLVE-LOOP -COMP) imm(LEAVE ?COMP DOTICK DODOLEAVE COMPILE, LEAVES @ HERE LEAVES ! COMPILE,) imm(?LEAVE ?COMP DOTICK DODO?LEAVE COMPILE, LEAVES @ HERE LEAVES ! COMPILE,) // Interpreter nesting. col(SAVE-SOURCE R> IB >R #IB @ >R SOURCE-ID >R SPAN @ >R >IN @ >R >R) col(RESTORE-SOURCE R> R> >IN ! R> SPAN ! R> DOTO SOURCE-ID R> #IB ! R> DOTO IB >R) // System replies. str(OK-STR "ok") str(ABORTED-STR "Aborted") str(EXCEPTION-STR "Exception #") str(UNKNOWN-STR "Undefined word") dfr(HW-EXCEPTION-HANDLER) val(SHOW-STACK? 0) col(SHOWSTACK -1 DOTO SHOW-STACK?) col(NOSHOWSTACK 0 DOTO SHOW-STACK?) col(PRINT-STACK SHOW-STACK? 0BRANCH(5) >R >R .S R> R> ) col(PRINT-EXCEPTION DUP LIT(-99) = 0BRANCH(7) DOTICK UNKNOWN-STR COUNT TYPE CR DROP EXIT DUP LIT(0x100) = 0BRANCH(2) DROP EXIT HW-EXCEPTION-HANDLER ) col(PRINT-STATUS SPACE DUP 0= 0BRANCH(5) PRINT-STACK DOTICK OK-STR BRANCH(7) DUP -1 = 0BRANCH(6) DOTICK ABORTED-STR COUNT TYPE BRANCH(10) DUP LIT(-2) = 0BRANCH(7) ABORT"-STR @ COUNT TYPE DROP BRANCH(1) PRINT-EXCEPTION CR) // The compiler and interpreter. col(COMPILE-WORD 2DUP ($FIND) 0BRANCH(10) IMMEDIATE? 0BRANCH(4) NIP NIP EXECUTE EXIT COMPILE, 2DROP EXIT 2DUP $NUMBER 0BRANCH(4) TYPE LIT(-99) THROW DOTICK DOLIT COMPILE, COMPILE, 2DROP) col(INTERPRET-WORD 2DUP ($FIND) 0BRANCH(5) DROP NIP NIP EXECUTE EXIT 2DUP $NUMBER 0BRANCH(4) TYPE LIT(-99) THROW >R 2DROP R>) col(INTERPRET 0 >IN ! PARSE-WORD DUP 0BRANCH(10) STATE @ 0BRANCH(3) COMPILE-WORD BRANCH(1) INTERPRET-WORD BRANCH(-14) 2DROP) // Evaluate, the one word to rule them all. It is evil, btw. col(EVALUATE SAVE-SOURCE -1 DOTO SOURCE-ID DUP #IB ! SPAN ! DOTO IB DOTICK INTERPRET CATCH RESTORE-SOURCE THROW) col(EVAL EVALUATE) // Abort with a message. col(DOABORT" SWAP 0BRANCH(5) ABORT"-STR ! LIT(-2) THROW DROP) imm(ABORT" C" DOTICK DOABORT" COMPILE,) // Tick. str(UNDEFINED-STR "undefined word ") col(SET-UNDEFINED-WORD POCKET >R DOTICK UNDEFINED-STR DUP C@ 1+ R@ SWAP MOVE R@ DUP C@ 1+ + SWAP DUP R@ C@ + R@ C! MOVE R>) col(' PARSE-WORD $FIND 0= 0BRANCH(4) SET-UNDEFINED-WORD TRUE SWAP DOABORT") // The outer interpreter. col(QUIT 0 RDEPTH! [ TERMINAL DEPTH . LIT('>') EMIT SPACE REFILL 0BRANCH(10) SPACE DOTICK INTERPRET CATCH DUP PRINT-STATUS 0BRANCH(-17) BRANCH(-23)) // Reading and writing to/from file; including files. dfr(MAP-FILE) dfr(UNMAP-FILE) dfr(WRITE-FILE) col(INCLUDED MAP-FILE 2DUP >R >R BOUNDS DO?DO(21) R> R@ SWAP >R R@ - R@ SWAP 2DUP LINEFEED FINDCHAR 0BRANCH(1) NIP DUP >R EVALUATE R> 1+ DO+LOOP(-21) R> R> UNMAP-FILE) col(INCLUDE PARSE-WORD INCLUDED) // CREATE ... DOES> ... col($CREATE HEADER DOTICK DODOES COMPILE, DOTICK NOOP CELL+ COMPILE, REVEAL) col(CREATE PARSE-WORD $CREATE) col(DODOES> R> CELL+ LATEST @ LINK> CELL+ !) imm(DOES> DOTICK DODOES> COMPILE,) // Defining words. col(CONSTANT PARSE-WORD HEADER DOTICK DOCON COMPILE, COMPILE, REVEAL) col(VALUE PARSE-WORD HEADER DOTICK DOVAL COMPILE, COMPILE, REVEAL) col(VARIABLE PARSE-WORD HEADER DOTICK DOVAR COMPILE, 0 COMPILE, REVEAL) col(BUFFER: PARSE-WORD HEADER DOTICK DOBUFFER: COMPILE, ALLOT REVEAL) col(DEFER PARSE-WORD HEADER DOTICK DODEFER COMPILE, DOTICK ABORT COMPILE, REVEAL) col(ALIAS PARSE-WORD HEADER DOTICK DOALIAS COMPILE, ' COMPILE, REVEAL) col(STRUCT 0) col(END-STRUCT DROP) col(FIELD PARSE-WORD HEADER DOTICK DOFIELD COMPILE, OVER , + REVEAL) // Words with (mostly) non-standard compilation behaviour. imm(LITERAL DOTICK DOLIT COMPILE, COMPILE,) imm([COMPILE] ' COMPILE,) imm(POSTPONE PARSE-WORD 2DUP ($FIND) 0= 0BRANCH(4) SET-UNDEFINED-WORD TRUE SWAP DOABORT" IMMEDIATE? 0= 0BRANCH(6) DOTICK DOTICK COMPILE, COMPILE, DOTICK COMPILE, COMPILE, 2DROP) imm([CHAR] CHAR LITERAL) imm(['] ' DOTICK DOTICK COMPILE, COMPILE,) // FIND. col(FIND DUP COUNT ($FIND) 0BRANCH(9) ROT DROP TRUE SWAP IMMEDIATE? 0BRANCH(1) NEGATE EXIT FALSE EXIT) // Accessing data in CREATE'd words. imm(TO ' STATE @ 0BRANCH(5) DOTICK DOTO COMPILE, COMPILE, EXIT CELL+ !) col(BEHAVIOR CELL+ @) col(>BODY 2 CELLS +) col(BODY> 2 CELLS -) // Making words recursive. imm(RECURSIVE REVEAL) imm(RECURSE LATEST @ LINK> COMPILE,) // Numeric input. imm(d# PARSE-WORD BASE @ >R DECIMAL EVALUATE R> BASE !) imm(h# PARSE-WORD BASE @ >R HEX EVALUATE R> BASE !) imm(o# PARSE-WORD BASE @ >R OCTAL EVALUATE R> BASE !)