File:  [gforth] / gforth / cross.fs
Revision 1.22: download - view: text, annotated - select for diffs
Mon Feb 6 18:14:30 1995 UTC (24 years, 9 months ago) by anton
Branches: MAIN
CVS tags: HEAD
The bodies of words are now maxaligned

    1: \ CROSS.FS     The Cross-Compiler                      06oct92py
    2: \ $Id: cross.fs,v 1.22 1995/02/06 18:14:30 anton Exp $
    3: \ Idea and implementation: Bernd Paysan (py)
    4: \ Copyright 1992-94 by the GNU Forth 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: \ Begin CROSS COMPILER:
   35: 
   36: \ GhostNames                                            9may93jaw
   37: \ second name source to search trough list
   38: 
   39: VARIABLE GhostNames
   40: 0 GhostNames !
   41: : GhostName ( -- addr )
   42:     here GhostNames @ , GhostNames ! here 0 ,
   43:     bl word count
   44:     \ 2dup type space
   45:     string, cfalign ;
   46: 
   47: hex
   48: 
   49: 
   50: Vocabulary Cross
   51: Vocabulary Target
   52: Vocabulary Ghosts
   53: VOCABULARY Minimal
   54: only Forth also Target also also
   55: definitions Forth
   56: 
   57: : T  previous Cross also Target ; immediate
   58: : G  Ghosts ; immediate
   59: : H  previous Forth also Cross ; immediate
   60: 
   61: forth definitions
   62: 
   63: : T  previous Cross also Target ; immediate
   64: : G  Ghosts ; immediate
   65: 
   66: : >cross  also Cross definitions previous ;
   67: : >target also Target definitions previous ;
   68: : >minimal also Minimal definitions previous ;
   69: 
   70: H
   71: 
   72: >CROSS
   73: 
   74: \ Variables                                            06oct92py
   75: 
   76: -1 Constant NIL
   77: Variable image
   78: Variable tlast    NIL tlast !  \ Last name field
   79: Variable tlastcfa \ Last code field
   80: Variable tdoes    \ Resolve does> calls
   81: Variable bit$
   82: Variable tdp
   83: : there  tdp @ ;
   84: 
   85: \ Parameter for target systems                         06oct92py
   86: 
   87: included
   88: 
   89: \ Create additional parameters                         19jan95py
   90: 
   91: T
   92: cell               Constant tcell
   93: cell<<             Constant tcell<<
   94: cell>bit           Constant tcell>bit
   95: bits/byte          Constant tbits/byte
   96: float              Constant tfloat
   97: 1 bits/byte lshift Constant maxbyte
   98: H
   99: 
  100: >TARGET
  101: 
  102: \ Byte ordering and cell size                          06oct92py
  103: 
  104: : cell+         tcell + ;
  105: : cells         tcell<< lshift ;
  106: : chars         ;
  107: : floats	tfloat * ;
  108:     
  109: >CROSS
  110: : cell/         tcell<< rshift ;
  111: >TARGET
  112: 20 CONSTANT bl
  113: -1 Constant NIL
  114: -2 Constant :docol
  115: -3 Constant :docon
  116: -4 Constant :dovar
  117: -5 Constant :douser
  118: -6 Constant :dodefer
  119: -7 Constant :dodoes
  120: -8 Constant :doesjump
  121: 
  122: >CROSS
  123: 
  124: bigendian
  125: [IF]
  126:    : T!  ( n addr -- )  >r s>d r> tcell bounds swap 1-
  127:      DO  maxbyte ud/mod rot I c!  -1 +LOOP  2drop ;
  128:    : T@  ( addr -- n )  >r 0 0 r> tcell bounds
  129:      DO  maxbyte * swap maxbyte um* rot + swap I c@ + swap  LOOP d>s ;
  130: [ELSE]
  131:    : T!  ( n addr -- )  >r s>d r> tcell bounds
  132:      DO  maxbyte ud/mod rot I c!  LOOP  2drop ;
  133:    : T@  ( addr -- n )  >r 0 0 r> tcell bounds swap 1-
  134:      DO  maxbyte * swap maxbyte um* rot + swap I c@ + swap  -1 +LOOP d>s ;
  135: [THEN]
  136: 
  137: \ Memory initialisation                                05dec92py
  138: \ Fixed bug in else part                               11may93jaw
  139: 
  140: [IFDEF] Memory \ Memory is a bigFORTH feature
  141:    also Memory
  142:    : initmem ( var len -- )
  143:      2dup swap handle! >r @ r> erase ;
  144:    toss
  145: [ELSE]
  146:    : initmem ( var len -- )
  147:      tuck allocate abort" CROSS: No memory for target"
  148:      ( len var adr ) dup rot !
  149:      ( len adr ) swap erase ;
  150: [THEN]
  151: 
  152: \ MakeKernal                                           12dec92py
  153: 
  154: >MINIMAL
  155: : makekernal ( targetsize -- targetsize )
  156:   bit$  over 1- cell>bit rshift 1+ initmem
  157:   image over initmem tdp off ;
  158: 
  159: >CROSS
  160: \ Bit string manipulation                               06oct92py
  161: \                                                       9may93jaw
  162: CREATE Bittable 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
  163: : bits ( n -- n ) chars Bittable + c@ ;
  164: 
  165: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
  166: : +bit ( addr n -- )  >bit over c@ or swap c! ;
  167: : -bit ( addr n -- )  >bit invert over c@ and swap c! ;
  168: : relon ( taddr -- )  bit$ @ swap cell/ +bit ;
  169: : reloff ( taddr -- )  bit$ @ swap cell/ -bit ;
  170: 
  171: \ Target memory access                                 06oct92py
  172: 
  173: : align+  ( taddr -- rest )
  174:     cell tuck 1- and - [ cell 1- ] Literal and ;
  175: : cfalign+  ( taddr -- rest )
  176:     \ see kernal.fs:cfaligned
  177:     float tuck 1- and - [ float 1- ] Literal and ;
  178: 
  179: >TARGET
  180: : aligned ( taddr -- ta-addr )  dup align+ + ;
  181: \ assumes cell alignment granularity (as GNU C)
  182: 
  183: : cfaligned ( taddr1 -- taddr2 )
  184:     \ see kernal.fs
  185:     dup cfalign+ + ;
  186: 
  187: >CROSS
  188: : >image ( taddr -- absaddr )  image @ + ;
  189: >TARGET
  190: : @  ( taddr -- w )     >image t@ ;
  191: : !  ( w taddr -- )     >image t! ;
  192: : c@ ( taddr -- char )  >image c@ ;
  193: : c! ( char taddr -- )  >image c! ;
  194: : 2@ ( taddr -- x1 x2 ) T dup cell+ @ swap @ H ;
  195: : 2! ( x1 x2 taddr -- ) T swap over ! cell+ ! H ;
  196: 
  197: \ Target compilation primitives                        06oct92py
  198: \ included A!                                          16may93jaw
  199: 
  200: : here  ( -- there )    there ;
  201: : allot ( n -- )        tdp +! ;
  202: : ,     ( w -- )        T here H cell T allot  ! H ;
  203: : c,    ( char -- )     T here    1 allot c! H ;
  204: : align ( -- )          T here H align+ 0 ?DO  bl T c, H LOOP ;
  205: : cfalign ( -- )
  206:     T here H cfalign+ 0 ?DO  bl T c, H LOOP ;
  207: 
  208: : A!                    dup relon T ! H ;
  209: : A,    ( w -- )        T here H relon T , H ;
  210: 
  211: >CROSS
  212: 
  213: \ threading modell                                     13dec92py
  214: 
  215: \ generic threading modell
  216: : docol,  ( -- ) :docol T A, 0 , H ;
  217: 
  218: >TARGET
  219: : >body   ( cfa -- pfa ) T cell+ cell+ H ;
  220: >CROSS
  221: 
  222: : dodoes, ( -- ) T :doesjump A, 0 , H ;
  223: 
  224: \ Ghost Builder                                        06oct92py
  225: 
  226: \ <T T> new version with temp variable                 10may93jaw
  227: 
  228: VARIABLE VocTemp
  229: 
  230: : <T  get-current VocTemp ! also Ghosts definitions ;
  231: : T>  previous VocTemp @ set-current ;
  232: 
  233: 4711 Constant <fwd>             4712 Constant <res>
  234: 4713 Constant <imm>
  235: 
  236: \ iForth makes only immediate directly after create
  237: \ make atonce trick! ?
  238: 
  239: Variable atonce atonce off
  240: 
  241: : NoExec true ABORT" CROSS: Don't execute ghost" ;
  242: 
  243: : GhostHeader <fwd> , 0 , ['] NoExec , ;
  244: 
  245: : >magic ; : >link cell+ ; : >exec cell+ cell+ ;
  246: : >end 3 cells + ;
  247: 
  248: Variable last-ghost
  249: : Make-Ghost ( "name" -- ghost )
  250:   >in @ GhostName swap >in !
  251:   <T Create atonce @ IF immediate atonce off THEN
  252:   here tuck swap ! ghostheader T>
  253:   DOES> dup last-ghost ! >exec @ execute ;
  254: 
  255: \ ghost words                                          14oct92py
  256: \                                          changed:    10may93py/jaw
  257: 
  258: : gfind   ( string -- ghost true/1 / string false )
  259: \ searches for string in word-list ghosts
  260: \ !! wouldn't it be simpler to just use search-wordlist ? ae
  261:   dup count [ ' ghosts >body ] ALiteral search-wordlist
  262:   dup IF  >r >body nip r>  THEN ;
  263: 
  264: VARIABLE Already
  265: 
  266: : ghost   ( "name" -- ghost )
  267:   Already off
  268:   >in @  bl word gfind   IF  Already on nip EXIT  THEN
  269:   drop  >in !  Make-Ghost ;
  270: 
  271: \ resolve                                              14oct92py
  272: 
  273: : resolve-loop ( ghost tcfa -- ghost tcfa )
  274:   >r dup >link @
  275:   BEGIN  dup  WHILE  dup T @ H r@ rot T ! H REPEAT  drop r> ;
  276: 
  277: \ exists                                                9may93jaw
  278: 
  279: : exists ( ghost tcfa -- )
  280:   over GhostNames
  281:   BEGIN @ dup
  282:   WHILE 2dup cell+ @ =
  283:   UNTIL
  284:         2 cells + count cr ." CROSS: Exists: " type 4 spaces drop
  285:         swap cell+ !
  286:   ELSE true ABORT" CROSS: Ghostnames inconsistent"
  287:   THEN ;
  288: 
  289: : resolve  ( ghost tcfa -- )
  290:   over >magic @ <fwd> <>  IF  exists EXIT THEN
  291:   resolve-loop  over >link ! <res> swap >magic ! ;
  292: 
  293: \ gexecute ghost,                                      01nov92py
  294: 
  295: : do-forward   ( ghost -- )
  296:   >link dup @  there rot !  T  A,  H ;
  297: : do-resolve   ( ghost -- )
  298:   >link @                   T  A,  H ;
  299: 
  300: : gexecute   ( ghost -- )   dup @
  301:              <fwd> = IF  do-forward  ELSE  do-resolve  THEN ;
  302: : ghost,     ghost  gexecute ;
  303: 
  304: \ .unresolved                                          11may93jaw
  305: 
  306: variable ResolveFlag
  307: 
  308: \ ?touched                                             11may93jaw
  309: 
  310: : ?touched ( ghost -- flag ) dup >magic @ <fwd> = swap >link @
  311:                                0 <> and ;
  312: 
  313: : ?resolved  ( ghostname -- )
  314:   dup cell+ @ ?touched
  315:   IF  cell+ cell+ count cr type ResolveFlag on ELSE drop THEN ;
  316: 
  317: >MINIMAL
  318: : .unresolved  ( -- )
  319:   ResolveFlag off cr ." Unresolved: "
  320:   Ghostnames
  321:   BEGIN @ dup
  322:   WHILE dup ?resolved
  323:   REPEAT drop ResolveFlag @
  324:   IF
  325:       abort" Unresolved words!"
  326:   ELSE
  327:       ." Nothing!"
  328:   THEN
  329:   cr ;
  330: 
  331: >CROSS
  332: \ Header states                                        12dec92py
  333: 
  334: : flag! ( 8b -- )   tlast @ dup >r T c@ xor r> c! H ;
  335: 
  336: VARIABLE ^imm
  337: 
  338: >TARGET
  339: : immediate     20 flag!
  340:                 ^imm @ @ dup <imm> = IF  drop  EXIT  THEN
  341:                 <res> <> ABORT" CROSS: Cannot immediate a unresolved word"
  342:                 <imm> ^imm @ ! ;
  343: : restrict      40 flag! ;
  344: >CROSS
  345: 
  346: \ ALIAS2 ansforth conform alias                          9may93jaw
  347: 
  348: : ALIAS2 create here 0 , DOES> @ execute ;
  349: \ usage:
  350: \ ' <name> alias2 bla !
  351: 
  352: \ Target Header Creation                               01nov92py
  353: 
  354: : string,  ( addr count -- )
  355:   dup T c, H bounds  DO  I c@ T c, H  LOOP ; 
  356: : name,  ( "name" -- )  bl word count string, T cfalign H ;
  357: : view,   ( -- ) ( dummy ) ;
  358: 
  359: VARIABLE CreateFlag CreateFlag off
  360: 
  361: : (Theader ( "name" -- ghost ) T align H view,
  362:   tlast @ dup 0> IF  T 1 cells - THEN  A, H  there tlast !
  363:   >in @ name, >in ! T here H tlastcfa !
  364:   CreateFlag @ IF
  365:        >in @ alias2 swap >in !         \ create alias in target
  366:        >in @ ghost swap >in !
  367:        swap also ghosts ' previous swap !     \ tick ghost and store in alias
  368:        CreateFlag off
  369:   ELSE ghost THEN
  370:   dup >magic ^imm !     \ a pointer for immediate
  371:   Already @ IF  dup >end tdoes !
  372:   ELSE 0 tdoes ! THEN
  373:   80 flag! ;
  374: 
  375: VARIABLE ;Resolve 1 cells allot
  376: 
  377: : Theader  ( "name" -- ghost )
  378:   (THeader dup there resolve 0 ;Resolve ! ;
  379: 
  380: >TARGET
  381: : Alias    ( cfa -- ) \ name
  382:   (THeader over resolve T A, H 80 flag! ;
  383: >CROSS
  384: 
  385: \ Conditionals and Comments                            11may93jaw
  386: 
  387: : ;Cond
  388:   postpone ;
  389:   swap ! ;  immediate
  390: 
  391: : Cond: ( -- ) \ name {code } ;
  392:   atonce on
  393:   ghost
  394:   >exec
  395:   :NONAME ;
  396: 
  397: : restrict? ( -- )
  398: \ aborts on interprete state - ae
  399:   state @ 0= ABORT" CROSS: Restricted" ;
  400: 
  401: : Comment ( -- )
  402:   >in @ atonce on ghost swap >in ! ' swap >exec ! ;
  403: 
  404: Comment (       Comment \
  405: 
  406: \ Predefined ghosts                                    12dec92py
  407: 
  408: ghost 0=                                        drop
  409: ghost branch    ghost ?branch                   2drop
  410: ghost (do)      ghost (?do)                     2drop
  411: ghost (for)                                     drop
  412: ghost (loop)    ghost (+loop)                   2drop
  413: ghost (next)                                    drop
  414: ghost unloop    ghost ;S                        2drop
  415: ghost lit       ghost (compile) ghost !         2drop drop
  416: ghost (;code)   ghost noop                      2drop
  417: ghost (.")      ghost (S")      ghost (ABORT")  2drop drop
  418: ghost '
  419: 
  420: \ compile                                              10may93jaw
  421: 
  422: : compile  ( -- ) \ name
  423:   restrict?
  424:   bl word gfind dup 0= ABORT" CROSS: Can't compile "
  425:   0> ( immediate? )
  426:   IF    >exec @ compile,
  427:   ELSE  postpone literal postpone gexecute  THEN ;
  428:                                         immediate
  429: 
  430: >TARGET
  431: : '  ( -- cfa ) bl word gfind 0= ABORT" CROSS: undefined "
  432:   dup >magic @ <fwd> = ABORT" CROSS: forward " >link @ ;
  433: 
  434: Cond: [']  compile lit ghost gexecute ;Cond
  435: 
  436: Cond: chars ;Cond
  437: 
  438: >CROSS
  439: \ tLiteral                                             12dec92py
  440: 
  441: : lit, ( n -- )   compile lit T  ,  H ;
  442: : alit, ( n -- )  compile lit T A,  H ;
  443: 
  444: >TARGET
  445: Cond:  Literal ( n -- )   restrict? lit, ;Cond
  446: Cond: ALiteral ( n -- )   restrict? alit, ;Cond
  447: 
  448: : Char ( "<char>" -- )  bl word char+ c@ ;
  449: Cond: [Char]   ( "<char>" -- )  restrict? Char  lit, ;Cond
  450: 
  451: >CROSS
  452: \ Target compiling loop                                12dec92py
  453: \ ">tib trick thrown out                               10may93jaw
  454: \ number? defined at the top                           11may93jaw
  455: 
  456: \ compiled word might leave items on stack!
  457: : tcom ( in name -- )
  458:   gfind  ?dup  IF    0> IF    nip >exec @ execute
  459:                         ELSE  nip gexecute  THEN EXIT THEN
  460:   number? dup  IF    0> IF swap lit,  THEN  lit,  drop
  461:                ELSE  2drop >in !
  462:                ghost gexecute THEN  ;
  463: 
  464: >TARGET
  465: \ : ; DOES>                                            13dec92py
  466: \ ]                                                     9may93py/jaw
  467: 
  468: : ] state on
  469:     BEGIN
  470:         BEGIN >in @ bl word
  471:               dup c@ 0= WHILE 2drop refill 0=
  472:               ABORT" CROSS: End of file while target compiling"
  473:         REPEAT
  474:         tcom
  475:         state @
  476:         0=
  477:     UNTIL ;
  478: 
  479: \ by the way: defining a second interpreter (a compiler-)loop
  480: \             is not allowed if a system should be ans conform
  481: 
  482: : : ( -- colon-sys ) \ Name
  483:   (THeader ;Resolve ! there ;Resolve cell+ !
  484:   docol, depth T ] H ;
  485: 
  486: Cond: EXIT ( -- )  restrict?  compile ;S  ;Cond
  487: 
  488: Cond: ?EXIT ( -- ) 1 abort" CROSS: using ?exit" ;Cond
  489: 
  490: Cond: ; ( -- ) restrict?
  491:                depth ?dup IF   1- <> ABORT" CROSS: Stack changed"
  492:                           ELSE true ABORT" CROSS: Stack empty" THEN
  493:                compile ;S state off
  494:                ;Resolve @
  495:                IF ;Resolve @ ;Resolve cell+ @ resolve THEN
  496:                ;Cond
  497: Cond: [  restrict? state off ;Cond
  498: 
  499: >CROSS
  500: : !does  :dodoes tlastcfa @ tuck T ! cell+ ! H ;
  501: 
  502: >TARGET
  503: Cond: DOES> restrict?
  504:         compile (;code) dodoes, tdoes @ ?dup IF  @ T here H resolve THEN
  505:         ;Cond
  506: : DOES> dodoes, T here H !does depth T ] H ;
  507: 
  508: >CROSS
  509: \ Creation                                             01nov92py
  510: 
  511: \ Builder                                               11may93jaw
  512: 
  513: : Builder    ( Create do: "name" -- )
  514:   >in @ alias2 swap dup >in ! >r >r
  515:   Make-Ghost rot swap >exec ! ,
  516:   r> r> >in !
  517:   also ghosts ' previous swap ! ;
  518: \  DOES>  dup >exec @ execute ;
  519: 
  520: : gdoes,  ( ghost -- )  >end @ dup >magic @ <fwd> <>
  521:   IF dup >link @ dup 0< IF T A, 0 , H drop EXIT THEN drop THEN
  522:   :dodoes T A, H gexecute T here H cell - reloff ;
  523: 
  524: : TCreate ( -- )
  525:   last-ghost @
  526:   CreateFlag on
  527:   Theader >r dup gdoes,
  528:   >end @ >exec @ r> >exec ! ;
  529: 
  530: : Build:  ( -- [xt] [colon-sys] )
  531:   :noname  postpone TCreate ;
  532: 
  533: : gdoes>  ( ghost -- addr flag )
  534:   last-ghost @
  535:   state @ IF  gexecute true EXIT  THEN
  536:   cell+ @ T >body H false ;
  537: 
  538: \ DO: ;DO                                               11may93jaw
  539: \ changed to ?EXIT                                      10may93jaw
  540: 
  541: : DO:     ( -- addr [xt] [colon-sys] )
  542:   here ghostheader
  543:   :noname postpone gdoes> postpone ?EXIT ;
  544: 
  545: : ;DO ( addr [xt] [colon-sys] -- )
  546:   postpone ;    ( S addr xt )
  547:   over >exec ! ; immediate
  548: 
  549: : by      ( -- addr ) \ Name
  550:   ghost >end @ ;
  551: 
  552: >TARGET
  553: \ Variables and Constants                              05dec92py
  554: 
  555: Build:  ;
  556: DO: ( ghost -- addr ) ;DO
  557: Builder Create
  558: by Create :dovar resolve
  559: 
  560: Build: T 0 , H ;
  561: by Create
  562: Builder Variable
  563: 
  564: Build: T 0 A, H ;
  565: by Create
  566: Builder AVariable
  567: 
  568: \ User variables                                       04may94py
  569: 
  570: >CROSS
  571: Variable tup  0 tup !
  572: Variable tudp 0 tudp !
  573: : u,  ( n -- udp )
  574:   tup @ tudp @ + T  ! H
  575:   tudp @ dup T cell+ H tudp ! ;
  576: : au, ( n -- udp )
  577:   tup @ tudp @ + T A! H
  578:   tudp @ dup T cell+ H tudp ! ;
  579: >TARGET
  580: 
  581: Build: T 0 u, , H ;
  582: DO: ( ghost -- up-addr )  T @ H tup @ + ;DO
  583: Builder User
  584: by User :douser resolve
  585: 
  586: Build: T 0 u, , 0 u, drop H ;
  587: by User
  588: Builder 2User
  589: 
  590: Build: T 0 au, , H ;
  591: by User
  592: Builder AUser
  593: 
  594: Build:  ( n -- ) T , H ;
  595: DO: ( ghost -- n ) T @ H ;DO
  596: Builder Constant
  597: by Constant :docon resolve
  598: 
  599: Build:  ( n -- ) T A, H ;
  600: by Constant
  601: Builder AConstant
  602: 
  603: Build: T 0 , H ;
  604: by Constant
  605: Builder Value
  606: 
  607: Build:  ( -- ) compile noop ;
  608: DO: ( ghost -- ) ABORT" CROSS: Don't execute" ;DO
  609: Builder Defer
  610: by Defer :dodefer resolve
  611: 
  612: \ structural conditionals                              17dec92py
  613: 
  614: >CROSS
  615: : ?struc      ( flag -- )       ABORT" CROSS: unstructured " ;
  616: : sys?        ( sys -- sys )    dup 0= ?struc ;
  617: : >mark       ( -- sys )        T here  0 , H ;
  618: : >resolve    ( sys -- )        T here over - swap ! H ;
  619: : <resolve    ( sys -- )        T here - , H ;
  620: >TARGET
  621: 
  622: \ Structural Conditionals                              12dec92py
  623: 
  624: Cond: BUT       restrict? sys? swap ;Cond
  625: Cond: YET       restrict? sys? dup ;Cond
  626: 
  627: >CROSS
  628: Variable tleavings
  629: >TARGET
  630: 
  631: Cond: DONE   ( addr -- )  restrict? tleavings @
  632:       BEGIN  2dup u> 0=  WHILE  dup T @ H swap >resolve REPEAT
  633:       tleavings ! drop ;Cond
  634: 
  635: >CROSS
  636: : (leave  T here H tleavings @ T , H  tleavings ! ;
  637: >TARGET
  638: 
  639: Cond: LEAVE     restrict? compile branch (leave ;Cond
  640: Cond: ?LEAVE    restrict? compile 0=  compile ?branch (leave  ;Cond
  641: 
  642: \ Structural Conditionals                              12dec92py
  643: 
  644: Cond: AHEAD     restrict? compile branch >mark ;Cond
  645: Cond: IF        restrict? compile ?branch >mark ;Cond
  646: Cond: THEN      restrict? sys? dup T @ H ?struc >resolve ;Cond
  647: Cond: ELSE      restrict? sys? compile AHEAD swap compile THEN ;Cond
  648: 
  649: Cond: BEGIN     restrict? T here H ;Cond
  650: Cond: WHILE     restrict? sys? compile IF swap ;Cond
  651: Cond: AGAIN     restrict? sys? compile branch <resolve ;Cond
  652: Cond: UNTIL     restrict? sys? compile ?branch <resolve ;Cond
  653: Cond: REPEAT    restrict? over 0= ?struc compile AGAIN compile THEN ;Cond
  654: 
  655: \ Structural Conditionals                              12dec92py
  656: 
  657: Cond: DO        restrict? compile (do)   T here H ;Cond
  658: Cond: ?DO       restrict? compile (?do)  (leave T here H ;Cond
  659: Cond: FOR       restrict? compile (for)  T here H ;Cond
  660: 
  661: >CROSS
  662: : loop]   dup <resolve cell - compile DONE compile unloop ;
  663: >TARGET
  664: 
  665: Cond: LOOP      restrict? sys? compile (loop)  loop] ;Cond
  666: Cond: +LOOP     restrict? sys? compile (+loop) loop] ;Cond
  667: Cond: NEXT      restrict? sys? compile (next)  loop] ;Cond
  668: 
  669: \ String words                                         23feb93py
  670: 
  671: : ,"            [char] " parse string, T align H ;
  672: 
  673: Cond: ."        restrict? compile (.")     T ," H ;Cond
  674: Cond: S"        restrict? compile (S")     T ," H ;Cond
  675: Cond: ABORT"    restrict? compile (ABORT") T ," H ;Cond
  676: 
  677: Cond: IS        T ' >body H compile ALiteral compile ! ;Cond
  678: : IS            T ' >body ! H ;
  679: Cond: TO        T ' >body H compile ALiteral compile ! ;Cond
  680: : TO            T ' >body ! H ;
  681: 
  682: \ LINKED ERR" ENV" 2ENV"                                18may93jaw
  683: 
  684: \ linked list primitive
  685: : linked        T here over @ A, swap ! H ;
  686: 
  687: : err"   s" ErrLink linked" evaluate T , H
  688:          [char] " parse string, T align H ;
  689: 
  690: : env"  [char] " parse s" EnvLink linked" evaluate
  691:         string, T align , H ;
  692: 
  693: : 2env" [char] " parse s" EnvLink linked" evaluate
  694:         here >r string, T align , , H
  695:         r> dup T c@ H 80 and swap T c! H ;
  696: 
  697: \ compile must be last                                 22feb93py
  698: 
  699: Cond: compile ( -- ) restrict? \ name
  700:       bl word gfind dup 0= ABORT" CROSS: Can't compile"
  701:       0> IF    gexecute
  702:          ELSE  dup >magic @ <imm> =
  703:                IF   gexecute
  704:                ELSE compile (compile) gexecute THEN THEN ;Cond
  705: 
  706: Cond: postpone ( -- ) restrict? \ name
  707:       bl word gfind dup 0= ABORT" CROSS: Can't compile"
  708:       0> IF    gexecute
  709:          ELSE  dup >magic @ <imm> =
  710:                IF   gexecute
  711:                ELSE compile (compile) gexecute THEN THEN ;Cond
  712: 
  713: >MINIMAL
  714: also minimal
  715: \ Usefull words                                        13feb93py
  716: 
  717: : KB  400 * ;
  718: 
  719: \ define new [IFDEF] and [IFUNDEF]                      20may93jaw
  720: 
  721: : there? bl word gfind IF >magic @ <fwd> <> ELSE drop false THEN ;
  722: 
  723: : [IFDEF] there? postpone [IF] ;
  724: : [IFUNDEF] there? 0= postpone [IF] ;
  725: 
  726: \ C: \- \+ Conditional Compiling                         09jun93jaw
  727: 
  728: : C: >in @ there? 0=
  729:      IF    >in ! T : H
  730:      ELSE drop
  731:         BEGIN bl word dup c@
  732:               IF   count comment? s" ;" compare 0= ?EXIT
  733:               ELSE refill 0= ABORT" CROSS: Out of Input while C:"
  734:               THEN
  735:         AGAIN
  736:      THEN ;
  737: 
  738: also minimal
  739: 
  740: : \- there? IF postpone \ THEN ;
  741: : \+ there? 0= IF postpone \ THEN ;
  742: 
  743: : [IF]   postpone [IF] ;
  744: : [THEN] postpone [THEN] ;
  745: : [ELSE] postpone [ELSE] ;
  746: 
  747: Cond: [IF]      [IF] ;Cond
  748: Cond: [IFDEF]   [IFDEF] ;Cond
  749: Cond: [IFUNDEF] [IFUNDEF] ;Cond
  750: Cond: [THEN]    [THEN] ;Cond
  751: Cond: [ELSE]    [ELSE] ;Cond
  752: 
  753: \ save-cross                                           17mar93py
  754: 
  755: \ i'm not interested in bigforth features this time    10may93jaw
  756: \ [IFDEF] file
  757: \ also file
  758: \ [THEN]
  759: \ included throw after create-file                     11may93jaw
  760: 
  761: bigendian Constant bigendian
  762: 
  763: : save-cross ( "name" -- )
  764:   bl parse ." Saving to " 2dup type
  765:   w/o bin create-file throw >r
  766:   s" gforth00"  r@ write-file throw \ write magic
  767:   image @ there r@ write-file throw \ write image
  768:   bit$  @ there 1- cell>bit rshift 1+
  769:                 r@ write-file throw \ write tags
  770:   r> close-file throw ;
  771: 
  772: \ words that should be in minimal
  773: 
  774: : + + ;         : 1- 1- ;
  775: : - - ;         : 2* 2* ;
  776: : * * ;         : / / ;
  777: : dup dup ;     : over over ;
  778: : swap swap ;   : rot rot ;
  779: : drop drop ;   : =   = ;
  780: : lshift lshift ; : 2/ 2/ ;
  781: : . . ;
  782: cell constant cell
  783: 
  784: \ include bug5.fs
  785: \ only forth also minimal definitions
  786: 
  787: : \ postpone \ ;
  788: : ( postpone ( ;
  789: : include bl word count included ;
  790: : .( [char] ) parse type ;
  791: : cr cr ;
  792: 
  793: : times 0 ?DO dup T c, H LOOP drop ; \ used for space table creation
  794: only forth also minimal definitions
  795: 
  796: \ cross-compiler words
  797: 
  798: : decimal       decimal ;
  799: : hex           hex ;
  800: 
  801: : tudp          T tudp H ;
  802: : tup           T tup H ;  minimal
  803: 
  804: \ for debugging...
  805: : order         order ;
  806: : words         words ;
  807: : .s            .s ;
  808: 
  809: : bye           bye ;
  810: 
  811: \ turnkey direction
  812: : H forth ; immediate
  813: : T minimal ; immediate
  814: : G ghosts ; immediate
  815: 
  816: : turnkey  0 set-order also Target definitions
  817:            also Minimal also ;
  818: 
  819: \ these ones are pefered:
  820: 
  821: : lock   turnkey ;
  822: : unlock forth also cross ;
  823: 
  824: unlock definitions also minimal
  825: : lock   lock ;
  826: lock

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