File:  [gforth] / gforth / cross.fs
Revision 1.19: download - view: text, annotated - select for diffs
Thu Jan 19 17:47:59 1995 UTC (24 years, 10 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
float.fs: Added f~ (f-proximate)
wordsets.fs: Added missing float words
Added 16 bit and 64 bit support in cross.fs
Fixed some bugs which asume sizeof(int)=sizeof(Cell)

    1: \ CROSS.FS     The Cross-Compiler                      06oct92py
    2: \ $Id: cross.fs,v 1.19 1995/01/19 17:47:59 pazsan 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:         dup c, here over chars allot swap move align ;
   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  0 pad ! -1 pad c! pad @ 0<
  125: = [IF]
  126: \   : bswap ; immediate 
  127: : T!  ( n addr -- )  >r s>d r> tcell bounds swap 1-
  128:   DO  maxbyte ud/mod rot I c!  -1 +LOOP  2drop ;
  129: : T@  ( addr -- n )  >r 0 0 r> tcell bounds
  130:   DO  maxbyte * swap maxbyte um* rot + swap I c@ + swap  LOOP d>s ;
  131: 
  132: [ELSE]
  133: : T!  ( n addr -- )  >r s>d r> tcell bounds
  134:   DO  maxbyte ud/mod rot I c!  LOOP  2drop ;
  135: : T@  ( addr -- n )  >r 0 0 r> tcell bounds swap 1-
  136:   DO  maxbyte * swap maxbyte um* rot + swap I c@ + swap  -1 +LOOP d>s ;
  137: 
  138: \   : bswap ( big / little -- little / big )  0
  139: \           cell 1- FOR  bits/byte lshift over
  140: \                        [ 1 bits/byte lshift 1- ] Literal and or
  141: \                        swap bits/byte rshift swap  NEXT  nip ;
  142: [THEN]
  143: 
  144: \ Memory initialisation                                05dec92py
  145: \ Fixed bug in else part                               11may93jaw
  146: 
  147: [IFDEF] Memory \ Memory is a bigFORTH feature
  148:    also Memory
  149:    : initmem ( var len -- )
  150:      2dup swap handle! >r @ r> erase ;
  151:    toss
  152: [ELSE]
  153:    : initmem ( var len -- )
  154:      tuck allocate abort" CROSS: No memory for target"
  155:      ( len var adr ) dup rot !
  156:      ( len adr ) swap erase ;
  157: [THEN]
  158: 
  159: \ MakeKernal                                           12dec92py
  160: 
  161: >MINIMAL
  162: : makekernal ( targetsize -- targetsize )
  163:   bit$  over 1- cell>bit rshift 1+ initmem
  164:   image over initmem tdp off ;
  165: 
  166: >CROSS
  167: \ Bit string manipulation                               06oct92py
  168: \                                                       9may93jaw
  169: CREATE Bittable 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
  170: : bits ( n -- n ) chars Bittable + c@ ;
  171: 
  172: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
  173: : +bit ( addr n -- )  >bit over c@ or swap c! ;
  174: : -bit ( addr n -- )  >bit invert over c@ and swap c! ;
  175: : relon ( taddr -- )  bit$ @ swap cell/ +bit ;
  176: : reloff ( taddr -- )  bit$ @ swap cell/ -bit ;
  177: 
  178: \ Target memory access                                 06oct92py
  179: 
  180: : align+  ( taddr -- rest )
  181:     cell tuck 1- and - [ cell 1- ] Literal and ;
  182: 
  183: >TARGET
  184: : aligned ( taddr -- ta-addr )  dup align+ + ;
  185: \ assumes cell alignment granularity (as GNU C)
  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: 
  206: : A!                    dup relon T ! H ;
  207: : A,    ( w -- )        T here H relon T , H ;
  208: 
  209: >CROSS
  210: 
  211: \ threading modell                                     13dec92py
  212: 
  213: \ generic threading modell
  214: : docol,  ( -- ) :docol T A, 0 , H ;
  215: 
  216: >TARGET
  217: : >body   ( cfa -- pfa ) T cell+ cell+ H ;
  218: >CROSS
  219: 
  220: : dodoes, ( -- ) T :doesjump A, 0 , H ;
  221: 
  222: \ Ghost Builder                                        06oct92py
  223: 
  224: \ <T T> new version with temp variable                 10may93jaw
  225: 
  226: VARIABLE VocTemp
  227: 
  228: : <T  get-current VocTemp ! also Ghosts definitions ;
  229: : T>  previous VocTemp @ set-current ;
  230: 
  231: 4711 Constant <fwd>             4712 Constant <res>
  232: 4713 Constant <imm>
  233: 
  234: \ iForth makes only immediate directly after create
  235: \ make atonce trick! ?
  236: 
  237: Variable atonce atonce off
  238: 
  239: : NoExec true ABORT" CROSS: Don't execute ghost" ;
  240: 
  241: : GhostHeader <fwd> , 0 , ['] NoExec , ;
  242: 
  243: : >magic ; : >link cell+ ; : >exec cell+ cell+ ;
  244: : >end 3 cells + ;
  245: 
  246: Variable last-ghost
  247: : Make-Ghost ( "name" -- ghost )
  248:   >in @ GhostName swap >in !
  249:   <T Create atonce @ IF immediate atonce off THEN
  250:   here tuck swap ! ghostheader T>
  251:   DOES> dup last-ghost ! >exec @ execute ;
  252: 
  253: \ ghost words                                          14oct92py
  254: \                                          changed:    10may93py/jaw
  255: 
  256: : gfind   ( string -- ghost true/1 / string false )
  257: \ searches for string in word-list ghosts
  258: \ !! wouldn't it be simpler to just use search-wordlist ? ae
  259:   dup count [ ' ghosts >body ] ALiteral search-wordlist
  260:   dup IF  >r >body nip r>  THEN ;
  261: 
  262: VARIABLE Already
  263: 
  264: : ghost   ( "name" -- ghost )
  265:   Already off
  266:   >in @  bl word gfind   IF  Already on nip EXIT  THEN
  267:   drop  >in !  Make-Ghost ;
  268: 
  269: \ resolve                                              14oct92py
  270: 
  271: : resolve-loop ( ghost tcfa -- ghost tcfa )
  272:   >r dup >link @
  273:   BEGIN  dup  WHILE  dup T @ H r@ rot T ! H REPEAT  drop r> ;
  274: 
  275: \ exists                                                9may93jaw
  276: 
  277: : exists ( ghost tcfa -- )
  278:   over GhostNames
  279:   BEGIN @ dup
  280:   WHILE 2dup cell+ @ =
  281:   UNTIL
  282:         2 cells + count cr ." CROSS: Exists: " type 4 spaces drop
  283:         swap cell+ !
  284:   ELSE true ABORT" CROSS: Ghostnames inconsistent"
  285:   THEN ;
  286: 
  287: : resolve  ( ghost tcfa -- )
  288:   over >magic @ <fwd> <>  IF  exists EXIT THEN
  289:   resolve-loop  over >link ! <res> swap >magic ! ;
  290: 
  291: \ gexecute ghost,                                      01nov92py
  292: 
  293: : do-forward   ( ghost -- )
  294:   >link dup @  there rot !  T  A,  H ;
  295: : do-resolve   ( ghost -- )
  296:   >link @                   T  A,  H ;
  297: 
  298: : gexecute   ( ghost -- )   dup @
  299:              <fwd> = IF  do-forward  ELSE  do-resolve  THEN ;
  300: : ghost,     ghost  gexecute ;
  301: 
  302: \ .unresolved                                          11may93jaw
  303: 
  304: variable ResolveFlag
  305: 
  306: \ ?touched                                             11may93jaw
  307: 
  308: : ?touched ( ghost -- flag ) dup >magic @ <fwd> = swap >link @
  309:                                0 <> and ;
  310: 
  311: : ?resolved  ( ghostname -- )
  312:   dup cell+ @ ?touched
  313:   IF  cell+ cell+ count cr type ResolveFlag on ELSE drop THEN ;
  314: 
  315: >MINIMAL
  316: : .unresolved  ( -- )
  317:   ResolveFlag off cr ." Unresolved: "
  318:   Ghostnames
  319:   BEGIN @ dup
  320:   WHILE dup ?resolved
  321:   REPEAT drop ResolveFlag @
  322:   IF
  323:       abort" Unresolved words!"
  324:   ELSE
  325:       ." Nothing!"
  326:   THEN
  327:   cr ;
  328: 
  329: >CROSS
  330: \ Header states                                        12dec92py
  331: 
  332: : flag! ( 8b -- )   tlast @ dup >r T c@ xor r> c! H ;
  333: 
  334: VARIABLE ^imm
  335: 
  336: >TARGET
  337: : immediate     20 flag!
  338:                 ^imm @ @ dup <imm> = IF  drop  EXIT  THEN
  339:                 <res> <> ABORT" CROSS: Cannot immediate a unresolved word"
  340:                 <imm> ^imm @ ! ;
  341: : restrict      40 flag! ;
  342: >CROSS
  343: 
  344: \ ALIAS2 ansforth conform alias                          9may93jaw
  345: 
  346: : ALIAS2 create here 0 , DOES> @ execute ;
  347: \ usage:
  348: \ ' <name> alias2 bla !
  349: 
  350: \ Target Header Creation                               01nov92py
  351: 
  352: : string,  ( addr count -- )
  353:   dup T c, H bounds  DO  I c@ T c, H  LOOP ; 
  354: : name,  ( "name" -- )  bl word count string, T align H ;
  355: : view,   ( -- ) ( dummy ) ;
  356: 
  357: VARIABLE CreateFlag CreateFlag off
  358: 
  359: : (Theader ( "name" -- ghost ) T align H view,
  360:   tlast @ dup 0> IF  T 1 cells - THEN  A, H  there tlast !
  361:   >in @ name, >in ! T here H tlastcfa !
  362:   CreateFlag @ IF
  363:        >in @ alias2 swap >in !         \ create alias in target
  364:        >in @ ghost swap >in !
  365:        swap also ghosts ' previous swap !     \ tick ghost and store in alias
  366:        CreateFlag off
  367:   ELSE ghost THEN
  368:   dup >magic ^imm !     \ a pointer for immediate
  369:   Already @ IF  dup >end tdoes !
  370:   ELSE 0 tdoes ! THEN
  371:   80 flag! ;
  372: 
  373: VARIABLE ;Resolve 1 cells allot
  374: 
  375: : Theader  ( "name" -- ghost )
  376:   (THeader dup there resolve 0 ;Resolve ! ;
  377: 
  378: >TARGET
  379: : Alias    ( cfa -- ) \ name
  380:   (THeader over resolve T A, H 80 flag! ;
  381: >CROSS
  382: 
  383: \ Conditionals and Comments                            11may93jaw
  384: 
  385: : ;Cond
  386:   postpone ;
  387:   swap ! ;  immediate
  388: 
  389: : Cond: ( -- ) \ name {code } ;
  390:   atonce on
  391:   ghost
  392:   >exec
  393:   :NONAME ;
  394: 
  395: : restrict? ( -- )
  396: \ aborts on interprete state - ae
  397:   state @ 0= ABORT" CROSS: Restricted" ;
  398: 
  399: : Comment ( -- )
  400:   >in @ atonce on ghost swap >in ! ' swap >exec ! ;
  401: 
  402: Comment (       Comment \
  403: 
  404: \ Predefined ghosts                                    12dec92py
  405: 
  406: ghost 0=                                        drop
  407: ghost branch    ghost ?branch                   2drop
  408: ghost (do)      ghost (?do)                     2drop
  409: ghost (for)                                     drop
  410: ghost (loop)    ghost (+loop)                   2drop
  411: ghost (next)                                    drop
  412: ghost unloop    ghost ;S                        2drop
  413: ghost lit       ghost (compile) ghost !         2drop drop
  414: ghost (;code)   ghost noop                      2drop
  415: ghost (.")      ghost (S")      ghost (ABORT")  2drop drop
  416: ghost '
  417: 
  418: \ compile                                              10may93jaw
  419: 
  420: : compile  ( -- ) \ name
  421:   restrict?
  422:   bl word gfind dup 0= ABORT" CROSS: Can't compile "
  423:   0> ( immediate? )
  424:   IF    >exec @ compile,
  425:   ELSE  postpone literal postpone gexecute  THEN ;
  426:                                         immediate
  427: 
  428: >TARGET
  429: : '  ( -- cfa ) bl word gfind 0= ABORT" CROSS: undefined "
  430:   dup >magic @ <fwd> = ABORT" CROSS: forward " >link @ ;
  431: 
  432: Cond: [']  compile lit ghost gexecute ;Cond
  433: 
  434: Cond: chars ;Cond
  435: 
  436: >CROSS
  437: \ tLiteral                                             12dec92py
  438: 
  439: : lit, ( n -- )   compile lit T  ,  H ;
  440: : alit, ( n -- )  compile lit T A,  H ;
  441: 
  442: >TARGET
  443: Cond:  Literal ( n -- )   restrict? lit, ;Cond
  444: Cond: ALiteral ( n -- )   restrict? alit, ;Cond
  445: 
  446: : Char ( "<char>" -- )  bl word char+ c@ ;
  447: Cond: [Char]   ( "<char>" -- )  restrict? Char  lit, ;Cond
  448: 
  449: >CROSS
  450: \ Target compiling loop                                12dec92py
  451: \ ">tib trick thrown out                               10may93jaw
  452: \ number? defined at the top                           11may93jaw
  453: 
  454: \ compiled word might leave items on stack!
  455: : tcom ( in name -- )
  456:   gfind  ?dup  IF    0> IF    nip >exec @ execute
  457:                         ELSE  nip gexecute  THEN EXIT THEN
  458:   number? dup  IF    0> IF swap lit,  THEN  lit,  drop
  459:                ELSE  2drop >in !
  460:                ghost gexecute THEN  ;
  461: 
  462: >TARGET
  463: \ : ; DOES>                                            13dec92py
  464: \ ]                                                     9may93py/jaw
  465: 
  466: : ] state on
  467:     BEGIN
  468:         BEGIN >in @ bl word
  469:               dup c@ 0= WHILE 2drop refill 0=
  470:               ABORT" CROSS: End of file while target compiling"
  471:         REPEAT
  472:         tcom
  473:         state @
  474:         0=
  475:     UNTIL ;
  476: 
  477: \ by the way: defining a second interpreter (a compiler-)loop
  478: \             is not allowed if a system should be ans conform
  479: 
  480: : : ( -- colon-sys ) \ Name
  481:   (THeader ;Resolve ! there ;Resolve cell+ !
  482:   docol, depth T ] H ;
  483: 
  484: Cond: EXIT ( -- )  restrict?  compile ;S  ;Cond
  485: 
  486: Cond: ?EXIT ( -- ) 1 abort" CROSS: using ?exit" ;Cond
  487: 
  488: Cond: ; ( -- ) restrict?
  489:                depth ?dup IF   1- <> ABORT" CROSS: Stack changed"
  490:                           ELSE true ABORT" CROSS: Stack empty" THEN
  491:                compile ;S state off
  492:                ;Resolve @
  493:                IF ;Resolve @ ;Resolve cell+ @ resolve THEN
  494:                ;Cond
  495: Cond: [  restrict? state off ;Cond
  496: 
  497: >CROSS
  498: : !does  :dodoes tlastcfa @ tuck T ! cell+ ! H ;
  499: 
  500: >TARGET
  501: Cond: DOES> restrict?
  502:         compile (;code) dodoes, tdoes @ ?dup IF  @ T here H resolve THEN
  503:         ;Cond
  504: : DOES> dodoes, T here H !does depth T ] H ;
  505: 
  506: >CROSS
  507: \ Creation                                             01nov92py
  508: 
  509: \ Builder                                               11may93jaw
  510: 
  511: : Builder    ( Create do: "name" -- )
  512:   >in @ alias2 swap dup >in ! >r >r
  513:   Make-Ghost rot swap >exec ! ,
  514:   r> r> >in !
  515:   also ghosts ' previous swap ! ;
  516: \  DOES>  dup >exec @ execute ;
  517: 
  518: : gdoes,  ( ghost -- )  >end @ dup >magic @ <fwd> <>
  519:   IF dup >link @ dup 0< IF T A, 0 , H drop EXIT THEN drop THEN
  520:   :dodoes T A, H gexecute T here H cell - reloff ;
  521: 
  522: : TCreate ( -- )
  523:   last-ghost @
  524:   CreateFlag on
  525:   Theader >r dup gdoes,
  526:   >end @ >exec @ r> >exec ! ;
  527: 
  528: : Build:  ( -- [xt] [colon-sys] )
  529:   :noname  postpone TCreate ;
  530: 
  531: : gdoes>  ( ghost -- addr flag )
  532:   last-ghost @
  533:   state @ IF  gexecute true EXIT  THEN
  534:   cell+ @ T >body H false ;
  535: 
  536: \ DO: ;DO                                               11may93jaw
  537: \ changed to ?EXIT                                      10may93jaw
  538: 
  539: : DO:     ( -- addr [xt] [colon-sys] )
  540:   here ghostheader
  541:   :noname postpone gdoes> postpone ?EXIT ;
  542: 
  543: : ;DO ( addr [xt] [colon-sys] -- )
  544:   postpone ;    ( S addr xt )
  545:   over >exec ! ; immediate
  546: 
  547: : by      ( -- addr ) \ Name
  548:   ghost >end @ ;
  549: 
  550: >TARGET
  551: \ Variables and Constants                              05dec92py
  552: 
  553: Build:  ;
  554: DO: ( ghost -- addr ) ;DO
  555: Builder Create
  556: by Create :dovar resolve
  557: 
  558: Build: T 0 , H ;
  559: by Create
  560: Builder Variable
  561: 
  562: Build: T 0 A, H ;
  563: by Create
  564: Builder AVariable
  565: 
  566: \ User variables                                       04may94py
  567: 
  568: >CROSS
  569: Variable tup  0 tup !
  570: Variable tudp 0 tudp !
  571: : u,  ( n -- udp )
  572:   tup @ tudp @ + T  ! H
  573:   tudp @ dup T cell+ H tudp ! ;
  574: : au, ( n -- udp )
  575:   tup @ tudp @ + T A! H
  576:   tudp @ dup T cell+ H tudp ! ;
  577: >TARGET
  578: 
  579: Build: T 0 u, , H ;
  580: DO: ( ghost -- up-addr )  T @ H tup @ + ;DO
  581: Builder User
  582: by User :douser resolve
  583: 
  584: Build: T 0 u, , 0 u, drop H ;
  585: by User
  586: Builder 2User
  587: 
  588: Build: T 0 au, , H ;
  589: by User
  590: Builder AUser
  591: 
  592: Build:  ( n -- ) T , H ;
  593: DO: ( ghost -- n ) T @ H ;DO
  594: Builder Constant
  595: by Constant :docon resolve
  596: 
  597: Build:  ( n -- ) T A, H ;
  598: by Constant
  599: Builder AConstant
  600: 
  601: Build: T 0 , H ;
  602: by Constant
  603: Builder Value
  604: 
  605: Build:  ( -- ) compile noop ;
  606: DO: ( ghost -- ) ABORT" CROSS: Don't execute" ;DO
  607: Builder Defer
  608: by Defer :dodefer resolve
  609: 
  610: \ structural conditionals                              17dec92py
  611: 
  612: >CROSS
  613: : ?struc      ( flag -- )       ABORT" CROSS: unstructured " ;
  614: : sys?        ( sys -- sys )    dup 0= ?struc ;
  615: : >mark       ( -- sys )        T here  0 , H ;
  616: : >resolve    ( sys -- )        T here over - swap ! H ;
  617: : <resolve    ( sys -- )        T here - , H ;
  618: >TARGET
  619: 
  620: \ Structural Conditionals                              12dec92py
  621: 
  622: Cond: BUT       restrict? sys? swap ;Cond
  623: Cond: YET       restrict? sys? dup ;Cond
  624: 
  625: >CROSS
  626: Variable tleavings
  627: >TARGET
  628: 
  629: Cond: DONE   ( addr -- )  restrict? tleavings @
  630:       BEGIN  2dup u> 0=  WHILE  dup T @ H swap >resolve REPEAT
  631:       tleavings ! drop ;Cond
  632: 
  633: >CROSS
  634: : (leave  T here H tleavings @ T , H  tleavings ! ;
  635: >TARGET
  636: 
  637: Cond: LEAVE     restrict? compile branch (leave ;Cond
  638: Cond: ?LEAVE    restrict? compile 0=  compile ?branch (leave  ;Cond
  639: 
  640: \ Structural Conditionals                              12dec92py
  641: 
  642: Cond: AHEAD     restrict? compile branch >mark ;Cond
  643: Cond: IF        restrict? compile ?branch >mark ;Cond
  644: Cond: THEN      restrict? sys? dup T @ H ?struc >resolve ;Cond
  645: Cond: ELSE      restrict? sys? compile AHEAD swap compile THEN ;Cond
  646: 
  647: Cond: BEGIN     restrict? T here H ;Cond
  648: Cond: WHILE     restrict? sys? compile IF swap ;Cond
  649: Cond: AGAIN     restrict? sys? compile branch <resolve ;Cond
  650: Cond: UNTIL     restrict? sys? compile ?branch <resolve ;Cond
  651: Cond: REPEAT    restrict? over 0= ?struc compile AGAIN compile THEN ;Cond
  652: 
  653: \ Structural Conditionals                              12dec92py
  654: 
  655: Cond: DO        restrict? compile (do)   T here H ;Cond
  656: Cond: ?DO       restrict? compile (?do)  (leave T here H ;Cond
  657: Cond: FOR       restrict? compile (for)  T here H ;Cond
  658: 
  659: >CROSS
  660: : loop]   dup <resolve cell - compile DONE compile unloop ;
  661: >TARGET
  662: 
  663: Cond: LOOP      restrict? sys? compile (loop)  loop] ;Cond
  664: Cond: +LOOP     restrict? sys? compile (+loop) loop] ;Cond
  665: Cond: NEXT      restrict? sys? compile (next)  loop] ;Cond
  666: 
  667: \ String words                                         23feb93py
  668: 
  669: : ,"            [char] " parse string, T align H ;
  670: 
  671: Cond: ."        restrict? compile (.")     T ," H ;Cond
  672: Cond: S"        restrict? compile (S")     T ," H ;Cond
  673: Cond: ABORT"    restrict? compile (ABORT") T ," H ;Cond
  674: 
  675: Cond: IS        T ' >body H compile ALiteral compile ! ;Cond
  676: : IS            T ' >body ! H ;
  677: Cond: TO        T ' >body H compile ALiteral compile ! ;Cond
  678: : TO            T ' >body ! H ;
  679: 
  680: \ LINKED ERR" ENV" 2ENV"                                18may93jaw
  681: 
  682: \ linked list primitive
  683: : linked        T here over @ A, swap ! H ;
  684: 
  685: : err"   s" ErrLink linked" evaluate T , H
  686:          [char] " parse string, T align H ;
  687: 
  688: : env"  [char] " parse s" EnvLink linked" evaluate
  689:         string, T align , H ;
  690: 
  691: : 2env" [char] " parse s" EnvLink linked" evaluate
  692:         here >r string, T align , , H
  693:         r> dup T c@ H 80 and swap T c! H ;
  694: 
  695: \ compile must be last                                 22feb93py
  696: 
  697: Cond: compile ( -- ) restrict? \ name
  698:       bl word gfind dup 0= ABORT" CROSS: Can't compile"
  699:       0> IF    gexecute
  700:          ELSE  dup >magic @ <imm> =
  701:                IF   gexecute
  702:                ELSE compile (compile) gexecute THEN THEN ;Cond
  703: 
  704: Cond: postpone ( -- ) restrict? \ name
  705:       bl word gfind dup 0= ABORT" CROSS: Can't compile"
  706:       0> IF    gexecute
  707:          ELSE  dup >magic @ <imm> =
  708:                IF   gexecute
  709:                ELSE compile (compile) gexecute THEN THEN ;Cond
  710: 
  711: >MINIMAL
  712: also minimal
  713: \ Usefull words                                        13feb93py
  714: 
  715: : KB  400 * ;
  716: 
  717: \ define new [IFDEF] and [IFUNDEF]                      20may93jaw
  718: 
  719: : there? bl word gfind IF >magic @ <fwd> <> ELSE drop false THEN ;
  720: 
  721: : [IFDEF] there? postpone [IF] ;
  722: : [IFUNDEF] there? 0= postpone [IF] ;
  723: 
  724: \ C: \- \+ Conditional Compiling                         09jun93jaw
  725: 
  726: : C: >in @ there? 0=
  727:      IF    >in ! T : H
  728:      ELSE drop
  729:         BEGIN bl word dup c@
  730:               IF   count comment? s" ;" compare 0= ?EXIT
  731:               ELSE refill 0= ABORT" CROSS: Out of Input while C:"
  732:               THEN
  733:         AGAIN
  734:      THEN ;
  735: 
  736: also minimal
  737: 
  738: : \- there? IF postpone \ THEN ;
  739: : \+ there? 0= IF postpone \ THEN ;
  740: 
  741: : [IF]   postpone [IF] ;
  742: : [THEN] postpone [THEN] ;
  743: : [ELSE] postpone [ELSE] ;
  744: 
  745: Cond: [IF]      [IF] ;Cond
  746: Cond: [IFDEF]   [IFDEF] ;Cond
  747: Cond: [IFUNDEF] [IFUNDEF] ;Cond
  748: Cond: [THEN]    [THEN] ;Cond
  749: Cond: [ELSE]    [ELSE] ;Cond
  750: 
  751: \ save-cross                                           17mar93py
  752: 
  753: \ i'm not interested in bigforth features this time    10may93jaw
  754: \ [IFDEF] file
  755: \ also file
  756: \ [THEN]
  757: \ included throw after create-file                     11may93jaw
  758: 
  759: bigendian Constant bigendian
  760: 
  761: : save-cross ( "name" -- )
  762:   bl parse ." Saving to " 2dup type
  763:   w/o bin create-file throw >r
  764:   s" gforth00"  r@ write-file throw \ write magic
  765:   image @ there r@ write-file throw \ write image
  766:   bit$  @ there 1- cell>bit rshift 1+
  767:                 r@ write-file throw \ write tags
  768:   r> close-file throw ;
  769: 
  770: \ words that should be in minimal
  771: 
  772: : + + ;         : 1- 1- ;
  773: : - - ;         : 2* 2* ;
  774: : * * ;         : / / ;
  775: : dup dup ;     : over over ;
  776: : swap swap ;   : rot rot ;
  777: : drop drop ;   : =   = ;
  778: : lshift lshift ; : 2/ 2/ ;
  779: : . . ;
  780: cell constant cell
  781: 
  782: \ include bug5.fs
  783: \ only forth also minimal definitions
  784: 
  785: : \ postpone \ ;
  786: : ( postpone ( ;
  787: : include bl word count included ;
  788: : .( [char] ) parse type ;
  789: : cr cr ;
  790: 
  791: : times 0 ?DO dup T c, H LOOP drop ; \ used for space table creation
  792: only forth also minimal definitions
  793: 
  794: \ cross-compiler words
  795: 
  796: : decimal       decimal ;
  797: : hex           hex ;
  798: 
  799: : tudp          T tudp H ;
  800: : tup           T tup H ;  minimal
  801: 
  802: \ for debugging...
  803: : order         order ;
  804: : words         words ;
  805: : .s            .s ;
  806: 
  807: : bye           bye ;
  808: 
  809: \ turnkey direction
  810: : H forth ; immediate
  811: : T minimal ; immediate
  812: : G ghosts ; immediate
  813: 
  814: : turnkey  0 set-order also Target definitions
  815:            also Minimal also ;
  816: 
  817: \ these ones are pefered:
  818: 
  819: : lock   turnkey ;
  820: : unlock forth also cross ;
  821: 
  822: unlock definitions also minimal
  823: : lock   lock ;
  824: lock

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>