File:  [gforth] / gforth / cross.fs
Revision 1.7: download - view: text, annotated - select for diffs
Fri Jul 8 15:00:30 1994 UTC (25 years, 5 months ago) by anton
Branches: MAIN
CVS tags: HEAD
signals are now translated into THROWs
A number of bug fixes (make a diff of BUGS for details)
added assert.fs and debugging.fs
made .s nicer
keep names of included files (in loadfilename) and print them upon error

    1: \ CROSS.FS     The Cross-Compiler                      06oct92py
    2: \ $Id: cross.fs,v 1.7 1994/07/08 15:00:30 anton Exp $
    3: \ Idea and implementation: Bernd Paysan (py)
    4: \ Copyright 1992 by the ANSI figForth Development Group
    5: 
    6: \ Log:
    7: \       changed in ; [ to state off           12may93jaw
    8: \       included place +place                 12may93jaw
    9: \       for a created word (variable, constant...)
   10: \       is now an alias in the target voabulary.
   11: \       this means it is no longer necessary to
   12: \       switch between vocabularies for variable
   13: \       initialization                        12may93jaw
   14: \       discovered error in DOES>
   15: \       replaced !does with (;code)           16may93jaw
   16: \       made complete redesign and
   17: \       introduced two vocs method
   18: \       to be asure that the right words
   19: \       are found                             08jun93jaw
   20: \       btw:  ! works not with 16 bit
   21: \             targets                         09jun93jaw
   22: \       added: 2user and value                11jun93jaw
   23: 
   24: include other.fs       \ ansforth extentions for cross
   25: 
   26: : comment? ( c-addr u -- c-addr u )
   27:         2dup s" (" compare 0=
   28:         IF    postpone (
   29:         ELSE  2dup s" \" compare 0= IF postpone \ THEN
   30:         THEN ;
   31: 
   32: decimal
   33: 
   34: \ number?                                               11may93jaw
   35: 
   36: \ checks for +, -, $, & ...
   37: : leading? ( c-addr u -- c-addr u doubleflag negflag base )
   38:         2dup 1- chars + c@ [char] . =   \ process double
   39:         IF dup 1 chars = IF over 1 swap c! false ELSE 1 chars - true THEN
   40:         \ only if more than only . ( may be number output! )
   41:         \ if only . => store garbage
   42:         ELSE false THEN >r      \ numbers
   43:         false -rot base @ -rot
   44:         BEGIN over c@
   45:                 dup [char] - =
   46:                         IF drop >r >r >r
   47:                            drop true r> r> r> 0 THEN
   48:                 dup [char] + =
   49:                         IF drop 0 THEN
   50:                 dup [char] $ =
   51:                         IF drop >r >r drop 16 r> r> 0 THEN
   52:                 dup [char] & =
   53:                         IF drop >r >r drop 10 r> r> 0 THEN
   54:               0= IF 1 chars - swap char+ swap false ELSE true THEN
   55:               over 0= or
   56:         UNTIL
   57:               rot >r rot r> r> -rot ;
   58: 
   59: : number? ( c-addr -- n/d flag )
   60: \ return -1 if cell 1 if double 0 if garbage
   61:                 0 swap 0 swap           \ create double number
   62:                 count leading?
   63:                 base @ >r base !
   64:                 >r >r
   65:                 >number IF 2drop false r> r> 2drop
   66:                            r> base ! EXIT THEN
   67:                 drop r> r>
   68:                 IF IF dnegate 1
   69:                    ELSE drop negate -1 THEN
   70:                 ELSE IF 1 ELSE drop -1 THEN
   71:                 THEN r> base ! ;
   72: 
   73: 
   74: 
   75: \ Begin CROSS COMPILER:
   76: 
   77: \ GhostNames                                            9may93jaw
   78: \ second name source to search trough list
   79: 
   80: VARIABLE GhostNames
   81: 0 GhostNames !
   82: : GhostName ( -- addr )
   83:         here GhostNames @ , GhostNames ! here 0 ,
   84:         name count
   85: \        2dup type space
   86:         dup c, here over chars allot swap move align ;
   87: 
   88: hex
   89: 
   90: 
   91: Vocabulary Cross
   92: Vocabulary Target
   93: Vocabulary Ghosts
   94: VOCABULARY Minimal
   95: only Forth also Target also also
   96: definitions Forth
   97: 
   98: : T  previous Cross also Target ; immediate
   99: : G  Ghosts ; immediate
  100: : H  previous Forth also Cross ; immediate
  101: 
  102: forth definitions
  103: 
  104: : T  previous Cross also Target ; immediate
  105: : G  Ghosts ; immediate
  106: 
  107: : >cross  also Cross definitions previous ;
  108: : >target also Target definitions previous ;
  109: : >minimal also Minimal definitions previous ;
  110: 
  111: H
  112: 
  113: >CROSS
  114: 
  115: \ Variables                                            06oct92py
  116: 
  117: -1 Constant NIL
  118: Variable image
  119: Variable tlast    NIL tlast !  \ Last name field
  120: Variable tlastcfa \ Last code field
  121: Variable tdoes    \ Resolve does> calls
  122: Variable bit$
  123: Variable tdp
  124: : there  tdp @ ;
  125: 
  126: \ Parameter for target systems                         06oct92py
  127: 
  128: include machine.fs
  129: 
  130: >TARGET
  131: 
  132: \ Byte ordering and cell size                          06oct92py
  133: 
  134: : cell+         cell + ;
  135: : cells         cell<< lshift ;
  136: : chars         ;
  137: : floats	float * ;
  138:     
  139: >CROSS
  140: : cell/         cell<< rshift ;
  141: >TARGET
  142: 20 CONSTANT bl
  143: -1 Constant NIL
  144: -2 Constant :docol
  145: -3 Constant :docon
  146: -4 Constant :dovar
  147: -5 Constant :douser
  148: -6 Constant :dodoes
  149: -7 Constant :doesjump
  150: 
  151: >CROSS
  152: 
  153: endian  0 pad ! -1 pad c! pad @ 0<
  154: = [IF]   : bswap ; immediate 
  155: [ELSE]   : bswap ( big / little -- little / big )  0
  156:            cell 1- FOR  bits/byte lshift over
  157:                         [ 1 bits/byte lshift 1- ] Literal and or
  158:                         swap bits/byte rshift swap  NEXT  nip ;
  159: [THEN]
  160: 
  161: \ Memory initialisation                                05dec92py
  162: \ Fixed bug in else part                               11may93jaw
  163: 
  164: [IFDEF] Memory \ Memory is a bigFORTH feature
  165:    also Memory
  166:    : initmem ( var len -- )
  167:      2dup swap handle! >r @ r> erase ;
  168:    toss
  169: [ELSE]
  170:    : initmem ( var len -- )
  171:      tuck allocate abort" CROSS: No memory for target"
  172:      ( len var adr ) dup rot !
  173:      ( len adr ) swap erase ;
  174: [THEN]
  175: 
  176: \ MakeKernal                                           12dec92py
  177: 
  178: >MINIMAL
  179: : makekernal ( targetsize -- targetsize )
  180:   bit$  over 1- cell>bit rshift 1+ initmem
  181:   image over initmem tdp off ;
  182: 
  183: >CROSS
  184: \ Bit string manipulation                               06oct92py
  185: \                                                       9may93jaw
  186: CREATE Bittable 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
  187: : bits ( n -- n ) chars Bittable + c@ ;
  188: 
  189: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
  190: : +bit ( addr n -- )  >bit over c@ or swap c! ;
  191: : -bit ( addr n -- )  >bit invert over c@ and swap c! ;
  192: : relon ( taddr -- )  bit$ @ swap cell/ +bit ;
  193: : reloff ( taddr -- )  bit$ @ swap cell/ -bit ;
  194: 
  195: \ Target memory access                                 06oct92py
  196: 
  197: : align+  ( taddr -- rest )
  198:     cell tuck 1- and - [ cell 1- ] Literal and ;
  199: 
  200: >TARGET
  201: : aligned ( taddr -- ta-addr )  dup align+ + ;
  202: \ assumes cell alignment granularity (as GNU C)
  203: 
  204: >CROSS
  205: : >image ( taddr -- absaddr )  image @ + ;
  206: >TARGET
  207: : @  ( taddr -- w )     >image @ bswap ;
  208: : !  ( w taddr -- )     >r bswap r> >image ! ;
  209: : c@ ( taddr -- char )  >image c@ ;
  210: : c! ( char taddr -- )  >image c! ;
  211: : 2@ ( taddr -- x1 x2 ) T dup cell+ @ swap @ H ;
  212: : 2! ( x1 x2 taddr -- ) T swap over ! cell+ ! H ;
  213: 
  214: \ Target compilation primitives                        06oct92py
  215: \ included A!                                          16may93jaw
  216: 
  217: : here  ( -- there )    there ;
  218: : allot ( n -- )        tdp +! ;
  219: : ,     ( w -- )        T here H cell T allot  ! H ;
  220: : c,    ( char -- )     T here    1 allot c! H ;
  221: : align ( -- )          T here H align+ 0 ?DO  bl T c, H LOOP ;
  222: 
  223: : A!                    dup relon T ! H ;
  224: : A,    ( w -- )        T here H relon T , H ;
  225: 
  226: >CROSS
  227: 
  228: \ threading modell                                     13dec92py
  229: 
  230: \ generic threading modell
  231: : docol,  ( -- ) :docol T A, 0 , H ;
  232: 
  233: >TARGET
  234: : >body   ( cfa -- pfa ) T cell+ cell+ H ;
  235: >CROSS
  236: 
  237: : dodoes, ( -- ) T :doesjump A, 0 , H ;
  238: 
  239: \ Ghost Builder                                        06oct92py
  240: 
  241: \ <T T> new version with temp variable                 10may93jaw
  242: 
  243: VARIABLE VocTemp
  244: 
  245: : <T  get-current VocTemp ! also Ghosts definitions ;
  246: : T>  previous VocTemp @ set-current ;
  247: 
  248: 4711 Constant <fwd>             4712 Constant <res>
  249: 4713 Constant <imm>
  250: 
  251: \ iForth makes only immediate directly after create
  252: \ make atonce trick! ?
  253: 
  254: Variable atonce atonce off
  255: 
  256: : NoExec true ABORT" CROSS: Don't execute ghost" ;
  257: 
  258: : GhostHeader <fwd> , 0 , ['] NoExec , ;
  259: 
  260: : >magic ; : >link cell+ ; : >exec cell+ cell+ ;
  261: : >end 3 cells + ;
  262: 
  263: : Make-Ghost ( "name" -- ghost )
  264:   >in @ GhostName swap >in !
  265:   <T Create atonce @ IF immediate atonce off THEN
  266:   here tuck swap ! ghostheader T>
  267:   DOES>  >exec @ execute ;
  268: 
  269: \ ghost words                                          14oct92py
  270: \                                          changed:    10may93py/jaw
  271: 
  272: : gfind   ( string -- ghost true/1 / string false )
  273: \ searches for string in word-list ghosts
  274: \ !! wouldn't it be simpler to just use search-wordlist ? ae
  275:   dup count [ ' ghosts >body ] ALiteral search-wordlist
  276: \ >r get-order  0 set-order also ghosts  r> find >r >r
  277:   >r r@ IF  >body nip  THEN  r> ;
  278: \ set-order  r> r@  IF  >body  THEN  r> ;
  279: 
  280: VARIABLE Already
  281: 
  282: : ghost   ( "name" -- ghost )
  283:   Already off
  284:   >in @  name gfind   IF  Already on nip EXIT  THEN
  285:   drop  >in !  Make-Ghost ;
  286: 
  287: \ resolve                                              14oct92py
  288: 
  289: : resolve-loop ( ghost tcfa -- ghost tcfa )
  290:   >r dup >link @
  291:   BEGIN  dup  WHILE  dup T @ H r@ rot T ! H REPEAT  drop r> ;
  292: 
  293: \ exists                                                9may93jaw
  294: 
  295: : exists ( ghost tcfa -- )
  296:   over GhostNames
  297:   BEGIN @ dup
  298:   WHILE 2dup cell+ @ =
  299:   UNTIL
  300:         nip 2 cells + count cr ." CROSS: Exists: " type 4 spaces
  301:         swap cell+ !
  302:   ELSE true ABORT" CROSS: Ghostnames inconsistent"
  303:   THEN ;
  304: 
  305: : resolve  ( ghost tcfa -- )
  306:   over >magic @ <fwd> <>  IF  exists EXIT THEN
  307:   resolve-loop  over >link ! <res> swap >magic ! ;
  308: 
  309: \ gexecute ghost,                                      01nov92py
  310: 
  311: : do-forward   ( ghost -- )
  312:   >link dup @  there rot !  T  A,  H ;
  313: : do-resolve   ( ghost -- )
  314:   >link @                   T  A,  H ;
  315: 
  316: : gexecute   ( ghost -- )   dup @
  317:              <fwd> = IF  do-forward  ELSE  do-resolve  THEN ;
  318: : ghost,     ghost  gexecute ;
  319: 
  320: \ .unresolved                                          11may93jaw
  321: 
  322: variable ResolveFlag
  323: 
  324: \ ?touched                                             11may93jaw
  325: 
  326: : ?touched ( ghost -- flag ) dup >magic @ <fwd> = swap >link @
  327:                                0 <> and ;
  328: 
  329: : ?resolved  ( ghostname -- )
  330:   dup cell+ @ ?touched
  331:   IF  cell+ cell+ count cr type ResolveFlag on ELSE drop THEN ;
  332: 
  333: >MINIMAL
  334: : .unresolved  ( -- )
  335:   ResolveFlag off cr ." Unresolved: "
  336:   Ghostnames
  337:   BEGIN @ dup
  338:   WHILE dup ?resolved
  339:   REPEAT drop ResolveFlag @ 0= IF ." Nothing!" THEN cr ;
  340: 
  341: >CROSS
  342: \ Header states                                        12dec92py
  343: 
  344: : flag! ( 8b -- )   tlast @ dup >r T c@ xor r> c! H ;
  345: 
  346: VARIABLE ^imm
  347: 
  348: >TARGET
  349: : immediate     20 flag!
  350:                 ^imm @ @ dup <imm> = ?EXIT
  351:                 <res> <> ABORT" CROSS: Cannot immediate a unresolved word"
  352:                 <imm> ^imm @ ! ;
  353: : restrict      ;
  354: >CROSS
  355: 
  356: \ ALIAS2 ansforth conform alias                          9may93jaw
  357: 
  358: : ALIAS2 create here 0 , DOES> @ execute ;
  359: \ usage:
  360: \ ' alias2 bla !
  361: 
  362: \ Target Header Creation                               01nov92py
  363: 
  364: : string,  ( addr count -- )
  365:   dup T c, H bounds  DO  I c@ T c, H  LOOP ; 
  366: : name,  ( "name" -- )  name count string, T align H ;
  367: : view,   ( -- ) ( dummy ) ;
  368: 
  369: VARIABLE CreateFlag CreateFlag off
  370: 
  371: : (Theader ( "name" -- ghost ) T align H view,
  372:   tlast @ dup 0> IF  T 1 cells - THEN  A, H  there tlast !
  373:   >in @ name, >in ! T here H tlastcfa !
  374:   CreateFlag @ IF
  375:   >in @ alias2 swap >in !         \ create alias in target
  376:   >in @ ghost swap >in !
  377:   swap also ghosts ' previous swap !        \ tick ghost and store in alias
  378:   CreateFlag off
  379:   ELSE ghost THEN
  380:   dup >magic ^imm !     \ a pointer for immediate
  381:   Already @ IF  dup >end tdoes !
  382:   ELSE 0 tdoes ! THEN
  383:   80 flag! ;
  384: 
  385: VARIABLE ;Resolve 1 cells allot
  386: 
  387: : Theader  ( "name" -- )     (THeader there resolve 0 ;Resolve ! ;
  388: 
  389: >TARGET
  390: : Alias    ( cfa -- ) \ name
  391:   (THeader over resolve T A, H 80 flag! ;
  392: >CROSS
  393: 
  394: \ Conditionals and Comments                            11may93jaw
  395: 
  396: : ;Cond
  397:   postpone ;
  398:   swap ! ;  immediate
  399: 
  400: : Cond: ( -- ) \ name {code } ;
  401:   atonce on
  402:   ghost
  403:   >exec
  404:   :NONAME ;
  405: 
  406: : restrict? ( -- )
  407: \ aborts on interprete state - ae
  408:   state @ 0= ABORT" CROSS: Restricted" ;
  409: 
  410: : Comment ( -- )
  411:   >in @ atonce on ghost swap >in ! ' swap >exec ! ;
  412: 
  413: Comment (       Comment \
  414: 
  415: \ Predefined ghosts                                    12dec92py
  416: 
  417: ghost 0=                                        drop
  418: ghost branch    ghost ?branch                   2drop
  419: ghost (do)      ghost (?do)                     2drop
  420: ghost (for)                                     drop
  421: ghost (loop)    ghost (+loop)                   2drop
  422: ghost (next)                                    drop
  423: ghost unloop    ghost ;S                        2drop
  424: ghost lit       ghost (compile) ghost !         2drop drop
  425: ghost (;code)   ghost noop                      2drop
  426: ghost (.")      ghost (S")      ghost (ABORT")  2drop drop
  427: 
  428: \ compile                                              10may93jaw
  429: 
  430: : compile  ( -- ) \ name
  431:   restrict?
  432:   name gfind dup 0= ABORT" CROSS: Can't compile "
  433:   0> ( immediate? )
  434:   IF    >exec @ compile,
  435:   ELSE  postpone literal postpone gexecute  THEN ;
  436:                                         immediate
  437: 
  438: >TARGET
  439: : '  ( -- cfa ) name gfind 0= ABORT" CROSS: undefined "
  440:   dup >magic @ <fwd> = ABORT" CROSS: forward " >link @ ;
  441: 
  442: Cond: [']  compile lit ghost gexecute ;Cond
  443: 
  444: >CROSS
  445: \ tLiteral                                             12dec92py
  446: 
  447: : lit, ( n -- )   compile lit T  ,  H ;
  448: : alit, ( n -- )  compile lit T A,  H ;
  449: 
  450: >TARGET
  451: Cond:  Literal ( n -- )   restrict? lit, ;Cond
  452: Cond: ALiteral ( n -- )   restrict? alit, ;Cond
  453: 
  454: : Char ( "<char>" -- )  bl word char+ c@ ;
  455: Cond: [Char]   ( "<char>" -- )  restrict? Char  lit, ;Cond
  456: 
  457: >CROSS
  458: \ Target compiling loop                                12dec92py
  459: \ ">tib trick thrown out                               10may93jaw
  460: \ number? defined at the top                           11may93jaw
  461: 
  462: \ compiled word might leave items on stack!
  463: : tcom ( in name -- )
  464:   gfind  ?dup  IF    0> IF    nip >exec @ execute
  465:                         ELSE  nip gexecute  THEN EXIT THEN
  466:   number? dup  IF    0> IF swap lit,  THEN  lit,  drop
  467:                ELSE  2drop >in !
  468:                ghost gexecute THEN  ;
  469: 
  470: >TARGET
  471: \ : ; DOES>                                            13dec92py
  472: \ ]                                                     9may93py/jaw
  473: 
  474: : ] state on
  475:     BEGIN
  476:         BEGIN >in @ name
  477:               dup c@ 0= WHILE 2drop refill 0=
  478:               ABORT" CROSS: End of file while target compiling"
  479:         REPEAT
  480:         tcom
  481:         state @
  482:         0=
  483:     UNTIL ;
  484: 
  485: \ by the way: defining a second interpreter (a compiler-)loop
  486: \             is not allowed if a system should be ans conform
  487: 
  488: : : ( -- colon-sys ) \ Name
  489:   (THeader ;Resolve ! there ;Resolve cell+ !
  490:   docol, depth T ] H ;
  491: 
  492: Cond: EXIT ( -- )  restrict?  compile ;S  ;Cond
  493: 
  494: Cond: ?EXIT ( -- ) 1 abort" CROSS: using ?exit" ;Cond
  495: 
  496: Cond: ; ( -- ) restrict?
  497:                depth ?dup IF   1- <> ABORT" CROSS: Stack changed"
  498:                           ELSE true ABORT" CROSS: Stack empty" THEN
  499:                compile ;S state off
  500:                ;Resolve @
  501:                IF ;Resolve @ ;Resolve cell+ @ resolve THEN
  502:                ;Cond
  503: Cond: [  restrict? state off ;Cond
  504: 
  505: >CROSS
  506: : !does  :dodoes tlastcfa @ tuck T ! cell+ ! H ;
  507: 
  508: >TARGET
  509: Cond: DOES> restrict?
  510:         compile (;code) dodoes, tdoes @ ?dup IF  @ T here H resolve THEN
  511:         ;Cond
  512: : DOES> dodoes, T here H !does depth T ] H ;
  513: 
  514: >CROSS
  515: \ Creation                                             01nov92py
  516: 
  517: \ Builder                                               11may93jaw
  518: 
  519: : Builder    ( Create do: "name" -- )
  520:   >in @ alias2 swap dup >in ! >r >r
  521:   Make-Ghost rot swap >exec ! ,
  522:   r> r> >in !
  523:   also ghosts ' previous swap !
  524:   DOES> dup >exec @ execute ;
  525: 
  526: : gdoes,  ( ghost -- )  >end @ dup >magic @ <fwd> <>
  527:   IF dup >link @ dup 0< IF T A, 0 , H drop EXIT THEN drop THEN
  528:   :dodoes T A, H gexecute T here H cell - reloff ;
  529: 
  530: : TCreate ( ghost -- )
  531:   CreateFlag on
  532:   Theader dup gdoes,
  533:   >end @ >exec @ execute ;
  534: 
  535: : Build:  ( -- [xt] [colon-sys] )
  536:   :noname  postpone TCreate ;
  537: 
  538: : gdoes>  ( ghost -- addr flag )
  539:   state @ IF  gexecute true EXIT  THEN
  540:   cell+ @ T >body H false ;
  541: 
  542: \ DO: ;DO                                               11may93jaw
  543: \ changed to ?EXIT                                      10may93jaw
  544: 
  545: : (does>)        postpone does> ; immediate \ second level does>
  546: 
  547: : DO:     ( -- addr [xt] [colon-sys] )
  548:   here ghostheader
  549:   :noname
  550:   postpone (does>) postpone gdoes> postpone ?EXIT ;
  551: 
  552: : ;DO ( addr [xt] [colon-sys] -- )
  553:   postpone ;    ( S addr xt )
  554:   over >exec ! ; immediate
  555: 
  556: : by      ( -- addr ) \ Name
  557:   ghost >end @ ;
  558: 
  559: >TARGET
  560: \ Variables and Constants                              05dec92py
  561: 
  562: Build:  ;
  563: DO: ( ghost -- addr ) ;DO
  564: Builder Create
  565: by Create :dovar resolve
  566: 
  567: Build: T 0 , H ;
  568: by Create
  569: Builder Variable
  570: 
  571: Build: T 0 A, H ;
  572: by Create
  573: Builder AVariable
  574: 
  575: \ User variables                                       04may94py
  576: 
  577: >CROSS
  578: Variable tup  0 tup !
  579: Variable tudp 0 tudp !
  580: : u,  ( n -- udp )
  581:   tup @ tudp @ + T  ! H
  582:   tudp @ dup cell+ tudp ! ;
  583: : au, ( n -- udp )
  584:   tup @ tudp @ + T A! H
  585:   tudp @ dup cell+ tudp ! ;
  586: >TARGET
  587: 
  588: Build: T 0 u, , H ;
  589: DO: ( ghost -- up-addr )  T @ H tup @ + ;DO
  590: Builder User
  591: by User :douser resolve
  592: 
  593: Build: T 0 u, , 0 u, drop H ;
  594: by User
  595: Builder 2User
  596: 
  597: Build: T 0 au, , H ;
  598: by User
  599: Builder AUser
  600: 
  601: Build:  ( n -- ) T , H ;
  602: DO: ( ghost -- n ) T @ H ;DO
  603: Builder Constant
  604: by Constant :docon resolve
  605: 
  606: Build:  ( n -- ) T A, H ;
  607: by Constant
  608: Builder AConstant
  609: 
  610: Build: T 0 , H ;
  611: by Constant
  612: Builder Value
  613: 
  614: Build:  ( -- ) compile noop ;
  615: DO: ( ghost -- ) ABORT" CROSS: Don't execute" ;DO
  616: Builder Defer
  617: 
  618: \ structural conditionals                              17dec92py
  619: 
  620: >CROSS
  621: : ?struc      ( flag -- )       ABORT" CROSS: unstructured " ;
  622: : sys?        ( sys -- sys )    dup 0= ?struc ;
  623: : >mark       ( -- sys )        T here  0 , H ;
  624: : >resolve    ( sys -- )        T here over - swap ! H ;
  625: : <resolve    ( sys -- )        T here - , H ;
  626: >TARGET
  627: 
  628: \ Structural Conditionals                              12dec92py
  629: 
  630: Cond: BUT       restrict? sys? swap ;Cond
  631: Cond: YET       restrict? sys? dup ;Cond
  632: 
  633: >CROSS
  634: Variable tleavings
  635: >TARGET
  636: 
  637: Cond: DONE   ( addr -- )  restrict? tleavings @
  638:       BEGIN  2dup u> 0=  WHILE  dup T @ H swap >resolve REPEAT
  639:       tleavings ! drop ;Cond
  640: 
  641: >CROSS
  642: : (leave  T here H tleavings @ T , H  tleavings ! ;
  643: >TARGET
  644: 
  645: Cond: LEAVE     restrict? compile branch (leave ;Cond
  646: Cond: ?LEAVE    restrict? compile 0=  compile ?branch (leave  ;Cond
  647: 
  648: \ Structural Conditionals                              12dec92py
  649: 
  650: Cond: AHEAD     restrict? compile branch >mark ;Cond
  651: Cond: IF        restrict? compile ?branch >mark ;Cond
  652: Cond: THEN      restrict? sys? dup T @ H ?struc >resolve ;Cond
  653: Cond: ELSE      restrict? sys? compile AHEAD swap compile THEN ;Cond
  654: 
  655: Cond: BEGIN     restrict? T here H ;Cond
  656: Cond: WHILE     restrict? sys? compile IF swap ;Cond
  657: Cond: AGAIN     restrict? sys? compile branch <resolve ;Cond
  658: Cond: UNTIL     restrict? sys? compile ?branch <resolve ;Cond
  659: Cond: REPEAT    restrict? over 0= ?struc compile AGAIN compile THEN ;Cond
  660: 
  661: \ Structural Conditionals                              12dec92py
  662: 
  663: Cond: DO        restrict? compile (do)   T here H ;Cond
  664: Cond: ?DO       restrict? compile (?do)  (leave T here H ;Cond
  665: Cond: FOR       restrict? compile (for)  T here H ;Cond
  666: 
  667: >CROSS
  668: : loop]   dup <resolve cell - compile DONE compile unloop ;
  669: >TARGET
  670: 
  671: Cond: LOOP      restrict? sys? compile (loop)  loop] ;Cond
  672: Cond: +LOOP     restrict? sys? compile (+loop) loop] ;Cond
  673: Cond: NEXT      restrict? sys? compile (next)  loop] ;Cond
  674: 
  675: \ String words                                         23feb93py
  676: 
  677: : ,"            [char] " parse string, T align H ;
  678: 
  679: Cond: ."        restrict? compile (.")     T ," H ;Cond
  680: Cond: S"        restrict? compile (S")     T ," H ;Cond
  681: Cond: ABORT"    restrict? compile (ABORT") T ," H ;Cond
  682: 
  683: Cond: IS        T ' >body H compile ALiteral compile ! ;Cond
  684: : IS            T ' >body ! H ;
  685: 
  686: \ LINKED ERR" ENV" 2ENV"                                18may93jaw
  687: 
  688: \ linked list primitive
  689: : linked        T here over @ A, swap ! H ;
  690: 
  691: : err"   s" ErrLink linked" evaluate T , H
  692:          [char] " parse string, T align H ;
  693: 
  694: : env"  [char] " parse s" EnvLink linked" evaluate
  695:         string, T align , H ;
  696: 
  697: : 2env" [char] " parse s" EnvLink linked" evaluate
  698:         here >r string, T align , , H
  699:         r> dup T c@ H 80 and swap T c! H ;
  700: 
  701: \ compile must be last                                 22feb93py
  702: 
  703: Cond: compile ( -- ) restrict? \ name
  704:       name gfind dup 0= ABORT" CROSS: Can't compile"
  705:       0> IF    gexecute
  706:          ELSE  dup >magic @ <imm> =
  707:                IF   gexecute
  708:                ELSE compile (compile) gexecute THEN THEN ;Cond
  709: 
  710: Cond: postpone ( -- ) restrict? \ name
  711:       name gfind dup 0= ABORT" CROSS: Can't compile"
  712:       0> IF    gexecute
  713:          ELSE  dup >magic @ <imm> =
  714:                IF   gexecute
  715:                ELSE compile (compile) gexecute THEN THEN ;Cond
  716: 
  717: >MINIMAL
  718: also minimal
  719: \ Usefull words                                        13feb93py
  720: 
  721: : KB  400 * ;
  722: 
  723: \ define new [IFDEF] and [IFUNDEF]                      20may93jaw
  724: 
  725: : there? name gfind IF >magic @ <fwd> <> ELSE drop false THEN ;
  726: 
  727: : [IFDEF] there? postpone [IF] ;
  728: : [IFUNDEF] there? 0= postpone [IF] ;
  729: 
  730: \ C: \- \+ Conditional Compiling                         09jun93jaw
  731: 
  732: : C: >in @ there? 0=
  733:      IF    >in ! T : H
  734:      ELSE drop
  735:         BEGIN bl word dup c@
  736:               IF   count comment? s" ;" compare 0= ?EXIT
  737:               ELSE refill 0= ABORT" CROSS: Out of Input while C:"
  738:               THEN
  739:         AGAIN
  740:      THEN ;
  741: 
  742: also minimal
  743: 
  744: : \- there? IF postpone \ THEN ;
  745: : \+ there? 0= IF postpone \ THEN ;
  746: 
  747: : [IF]   postpone [IF] ;
  748: : [THEN] postpone [THEN] ;
  749: : [ELSE] postpone [ELSE] ;
  750: 
  751: Cond: [IF]      [IF] ;Cond
  752: Cond: [IFDEF]   [IFDEF] ;Cond
  753: Cond: [IFUNDEF] [IFUNDEF] ;Cond
  754: Cond: [THEN]    [THEN] ;Cond
  755: Cond: [ELSE]    [ELSE] ;Cond
  756: 
  757: \ save-cross                                           17mar93py
  758: 
  759: \ i'm not interested in bigforth features this time    10may93jaw
  760: \ [IFDEF] file
  761: \ also file
  762: \ [THEN]
  763: \ included throw after create-file                     11may93jaw
  764: 
  765: endian Constant endian
  766: 
  767: : save-cross ( "name" -- )
  768:   bl parse ." Saving to " 2dup type
  769:   w/o bin create-file throw >r
  770:   image @ there r@ write-file throw
  771:   bit$  @ there 1- cell>bit rshift 1+ r@ write-file throw
  772:   r> close-file throw ;
  773: 
  774: \ words that should be in minimal
  775: 
  776: : + + ;         : 1- 1- ;
  777: : - - ;         : 2* 2* ;
  778: : dup dup ;     : over over ;
  779: : swap swap ;   : rot rot ;
  780: 
  781: \ include bug5.fs
  782: \ only forth also minimal definitions
  783: 
  784: : \ postpone \ ;
  785: : ( postpone ( ;
  786: : include bl word count included ;
  787: : .( [char] ) parse type ;
  788: : cr cr ;
  789: 
  790: : times 0 ?DO dup T c, H LOOP drop ; \ used for space table creation
  791: only forth also minimal definitions
  792: 
  793: \ cross-compiler words
  794: 
  795: : decimal       decimal ;
  796: : hex           hex ;
  797: 
  798: : tudp          T tudp H ;
  799: : tup           T tup H ;  minimal
  800: 
  801: \ for debugging...
  802: : order         order ;
  803: : words         words ;
  804: : .s            .s ;
  805: 
  806: : bye           bye ;
  807: 
  808: \ turnkey direction
  809: : H forth ; immediate
  810: : T minimal ; immediate
  811: : G ghosts ; immediate
  812: 
  813: : turnkey  0 set-order also Target definitions
  814:            also Minimal also ;
  815: 
  816: \ these ones are pefered:
  817: 
  818: : lock   turnkey ;
  819: : unlock forth also cross ;
  820: 
  821: unlock definitions also minimal
  822: : lock   lock ;
  823: lock

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