File:  [gforth] / gforth / cross.fs
Revision 1.3: download - view: text, annotated - select for diffs
Thu May 5 15:46:38 1994 UTC (25 years, 7 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Added direct threading for R3/4000. Still needs cache flush.
Added direct threading for R3/4000. Needs still cache flush.

    1: \ CROSS.FS     The Cross-Compiler                      06oct92py
    2: \ $Id: cross.fs,v 1.3 1994/05/05 15:46:38 pazsan 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: decimal
   27: 
   28: \ number?                                               11may93jaw
   29: 
   30: \ checks for +, -, $, & ...
   31: : leading? ( c-addr u -- c-addr u doubleflag negflag base )
   32:         2dup 1- chars + c@ [char] . =   \ process double
   33:         IF dup 1 chars = IF over 1 swap c! false ELSE 1 chars - true THEN
   34:         \ only if more than only . ( may be number output! )
   35:         \ if only . => store garbage
   36:         ELSE false THEN >r      \ numbers
   37:         false -rot base @ -rot
   38:         BEGIN over c@
   39:                 dup [char] - =
   40:                         IF drop >r >r >r
   41:                            drop true r> r> r> 0 THEN
   42:                 dup [char] + =
   43:                         IF drop 0 THEN
   44:                 dup [char] $ =
   45:                         IF drop >r >r drop 16 r> r> 0 THEN
   46:                 dup [char] & =
   47:                         IF drop >r >r drop 10 r> r> 0 THEN
   48:               0= IF 1 chars - swap char+ swap false ELSE true THEN
   49:               over 0= or
   50:         UNTIL
   51:               rot >r rot r> r> -rot ;
   52: 
   53: : number? ( c-addr -- n/d flag )
   54: \ return -1 if cell 1 if double 0 if garbage
   55:                 0 swap 0 swap           \ create double number
   56:                 count leading?
   57:                 base @ >r base !
   58:                 >r >r
   59:                 >number IF 2drop false r> r> 2drop
   60:                            r> base ! EXIT THEN
   61:                 drop r> r>
   62:                 IF IF dnegate 1
   63:                    ELSE drop negate -1 THEN
   64:                 ELSE IF 1 ELSE drop -1 THEN
   65:                 THEN r> base ! ;
   66: 
   67: 
   68: 
   69: \ Begin CROSS COMPILER:
   70: 
   71: \ GhostNames                                            9may93jaw
   72: \ second name source to search trough list
   73: 
   74: VARIABLE GhostNames
   75: 0 GhostNames !
   76: : GhostName ( -- addr )
   77:         here GhostNames @ , GhostNames ! here 0 ,
   78:         name count
   79: \        2dup type space
   80:         dup c, here over chars allot swap move align ;
   81: 
   82: hex
   83: 
   84: 
   85: Vocabulary Cross
   86: Vocabulary Target
   87: Vocabulary Ghosts
   88: VOCABULARY Minimal
   89: only Forth also Target also also
   90: definitions Forth
   91: 
   92: : T  previous Cross also Target ; immediate
   93: : G  Ghosts ; immediate
   94: : H  previous Forth also Cross ; immediate
   95: 
   96: forth definitions
   97: 
   98: : T  previous Cross also Target ; immediate
   99: : G  Ghosts ; immediate
  100: 
  101: : >cross  also Cross definitions previous ;
  102: : >target also Target definitions previous ;
  103: : >minimal also Minimal definitions previous ;
  104: 
  105: H
  106: 
  107: >CROSS
  108: 
  109: \ Variables                                            06oct92py
  110: 
  111: -1 Constant NIL
  112: Variable image
  113: Variable tlast    NIL tlast !  \ Last name field
  114: Variable tlastcfa \ Last code field
  115: Variable tdoes    \ Resolve does> calls
  116: Variable bit$
  117: Variable tdp
  118: : there  tdp @ ;
  119: 
  120: \ Parameter for target systems                         06oct92py
  121: 
  122: include machine.fs
  123: 
  124: >TARGET
  125: 
  126: \ Byte ordering and cell size                          06oct92py
  127: 
  128: : cell+         cell + ;
  129: : cells         cell<< lshift ;
  130: : chars         ;
  131: 
  132: >CROSS
  133: : cell/         cell<< rshift ;
  134: >TARGET
  135: 20 CONSTANT bl
  136: -1 Constant NIL
  137: -2 Constant :docol
  138: -3 Constant :docon
  139: -4 Constant :dovar
  140: -5 Constant :douser
  141: -6 Constant :dodoes
  142: -7 Constant :doesjump
  143: 
  144: >CROSS
  145: 
  146: endian  0 pad ! -1 pad c! pad @ 0<
  147: = [IF]   : bswap ; immediate 
  148: [ELSE]   : bswap ( big / little -- little / big )  0
  149:            cell 1- FOR  bits/byte lshift over
  150:                         [ 1 bits/byte lshift 1- ] Literal and or
  151:                         swap bits/byte rshift swap  NEXT  nip ;
  152: [THEN]
  153: 
  154: \ Memory initialisation                                05dec92py
  155: \ Fixed bug in else part                               11may93jaw
  156: 
  157: [IFDEF] Memory \ Memory is a bigFORTH feature
  158:    Memory
  159:    : initmem ( var len -- )
  160:      2dup swap handle! >r @ r> erase ;
  161:    Target
  162: [ELSE]
  163:    : initmem ( var len -- )
  164:      tuck allocate abort" CROSS: No memory for target"
  165:      ( len var adr ) dup rot !
  166:      ( len adr ) swap erase ;
  167: [THEN]
  168: 
  169: \ MakeKernal                                           12dec92py
  170: 
  171: >MINIMAL
  172: : makekernal ( targetsize -- targetsize )
  173:   bit$  over 1- cell>bit rshift 1+ initmem
  174:   image over initmem tdp off ;
  175: 
  176: >CROSS
  177: \ Bit string manipulation                               06oct92py
  178: \                                                       9may93jaw
  179: CREATE Bittable 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
  180: : bits ( n -- n ) chars Bittable + c@ ;
  181: 
  182: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
  183: : +bit ( addr n -- )  >bit over c@ or swap c! ;
  184: : relon ( taddr -- )  bit$ @ swap cell/ +bit ;
  185: 
  186: \ Target memory access                                 06oct92py
  187: 
  188: : align+  ( taddr -- rest )
  189:     cell tuck 1- and - [ cell 1- ] Literal and ;
  190: 
  191: >TARGET
  192: : aligned ( taddr -- ta-addr )  dup align+ + ;
  193: \ assumes cell alignment granularity (as GNU C)
  194: 
  195: >CROSS
  196: : >image ( taddr -- absaddr )  image @ + ;
  197: >TARGET
  198: : @  ( taddr -- w )     >image @ bswap ;
  199: : !  ( w taddr -- )     >r bswap r> >image ! ;
  200: : c@ ( taddr -- char )  >image c@ ;
  201: : c! ( char taddr -- )  >image c! ;
  202: 
  203: \ Target compilation primitives                        06oct92py
  204: \ included A!                                          16may93jaw
  205: 
  206: : here  ( -- there )    there ;
  207: : allot ( n -- )        tdp +! ;
  208: : ,     ( w -- )        T here H cell T allot  ! H ;
  209: : c,    ( char -- )     T here    1 allot c! H ;
  210: : align ( -- )          T here H align+ 0 ?DO  bl T c, H LOOP ;
  211: 
  212: : A!                    dup relon T ! H ;
  213: : A,    ( w -- )        T here H relon T , H ;
  214: 
  215: >CROSS
  216: 
  217: \ threading modell                                     13dec92py
  218: 
  219: \ generic threading modell
  220: : docol,  ( -- ) :docol T A, 0 , H ;
  221: 
  222: >TARGET
  223: : >body   ( cfa -- pfa ) T cell+ cell+ H ;
  224: >CROSS
  225: 
  226: : dodoes, ( -- ) T :doesjump A, 0 , H ;
  227: 
  228: \ Ghost Builder                                        06oct92py
  229: 
  230: \ <T T> new version with temp variable                 10may93jaw
  231: 
  232: VARIABLE VocTemp
  233: 
  234: : <T  get-current VocTemp ! also Ghosts definitions ;
  235: : T>  previous VocTemp @ set-current ;
  236: 
  237: 4711 Constant <fwd>             4712 Constant <res>
  238: 4713 Constant <imm>
  239: 
  240: \ iForth makes only immediate directly after create
  241: \ make atonce trick! ?
  242: 
  243: Variable atonce atonce off
  244: 
  245: : NoExec true ABORT" CROSS: Don't execute ghost" ;
  246: 
  247: : GhostHeader <fwd> , 0 , ['] NoExec , ;
  248: 
  249: : >magic ; : >link cell+ ; : >exec cell+ cell+ ;
  250: : >end 3 cells + ;
  251: 
  252: : Make-Ghost ( "name" -- ghost )
  253:   >in @ GhostName swap >in !
  254:   <T Create atonce @ IF immediate atonce off THEN
  255:   here tuck swap ! ghostheader T>
  256:   DOES>  >exec @ execute ;
  257: 
  258: \ ghost words                                          14oct92py
  259: \                                          changed:    10may93py/jaw
  260: 
  261: : gfind   ( string -- ghost true/1 / string false )
  262: \ searches for string in word-list ghosts
  263: \ !! wouldn't it be simpler to just use search-wordlist ? ae
  264:   >r get-order  0 set-order also ghosts  r> find >r >r
  265:   set-order  r> r@  IF  >body  THEN  r> ;
  266: 
  267: VARIABLE Already
  268: 
  269: : ghost   ( "name" -- ghost )
  270:   Already off
  271:   >in @  name gfind   IF  Already on nip EXIT  THEN
  272:   drop  >in !  Make-Ghost ;
  273: 
  274: \ resolve                                              14oct92py
  275: 
  276: : resolve-loop ( ghost tcfa -- ghost tcfa )
  277:   >r dup >link @
  278:   BEGIN  dup  WHILE  dup T @ H r@ rot T ! H REPEAT  drop r> ;
  279: 
  280: \ exists                                                9may93jaw
  281: 
  282: : exists ( ghost tcfa -- )
  283:   over GhostNames
  284:   BEGIN @ dup
  285:   WHILE 2dup cell+ @ =
  286:   UNTIL
  287:         nip 2 cells + count cr ." CROSS: Exists: " type 4 spaces
  288:         swap cell+ !
  289:   ELSE true ABORT" CROSS: Ghostnames inconsistent"
  290:   THEN ;
  291: 
  292: : resolve  ( ghost tcfa -- )
  293:   over >magic @ <fwd> <>  IF  exists EXIT THEN
  294:   resolve-loop  over >link ! <res> swap >magic ! ;
  295: 
  296: \ gexecute ghost,                                      01nov92py
  297: 
  298: : do-forward   ( ghost -- )
  299:   >link dup @  there rot !  T  A,  H ;
  300: : do-resolve   ( ghost -- )
  301:   >link @                   T  A,  H ;
  302: 
  303: : gexecute   ( ghost -- )   dup @
  304:              <fwd> = IF  do-forward  ELSE  do-resolve  THEN ;
  305: : ghost,     ghost  gexecute ;
  306: 
  307: \ .unresolved                                          11may93jaw
  308: 
  309: variable ResolveFlag
  310: 
  311: \ ?touched                                             11may93jaw
  312: 
  313: : ?touched ( ghost -- flag ) dup >magic @ <fwd> = swap >link @
  314:                                0 <> and ;
  315: 
  316: : ?resolved  ( ghostname -- )
  317:   dup cell+ @ ?touched
  318:   IF  cell+ cell+ count cr type ResolveFlag on ELSE drop THEN ;
  319: 
  320: >MINIMAL
  321: : .unresolved  ( -- )
  322:   ResolveFlag off cr ." Unresolved: "
  323:   Ghostnames
  324:   BEGIN @ dup
  325:   WHILE dup ?resolved
  326:   REPEAT drop ResolveFlag @ 0= IF ." Nothing!" THEN cr ;
  327: 
  328: >CROSS
  329: \ Header states                                        12dec92py
  330: 
  331: : flag! ( 8b -- )   tlast @ dup >r T c@ xor r> c! H ;
  332: 
  333: VARIABLE ^imm
  334: 
  335: >TARGET
  336: : immediate     20 flag!
  337:                 ^imm @ @ dup <imm> = ?EXIT
  338:                 <res> <> ABORT" CROSS: Cannot immediate a unresolved word"
  339:                 <imm> ^imm @ ! ;
  340: : restrict      ;
  341: >CROSS
  342: 
  343: \ ALIAS2 ansforth conform alias                          9may93jaw
  344: 
  345: : ALIAS2 create here 0 , DOES> @ execute ;
  346: \ usage:
  347: \ ' alias2 bla !
  348: 
  349: \ Target Header Creation                               01nov92py
  350: 
  351: : string,  ( addr count -- )
  352:   dup T c, H bounds  DO  I c@ T c, H  LOOP ; 
  353: : name,  ( "name" -- )  name count string, T align H ;
  354: : view,   ( -- ) ( dummy ) ;
  355: 
  356: VARIABLE CreateFlag CreateFlag off
  357: 
  358: : (Theader ( "name" -- ghost ) T align H view,
  359:   tlast @ dup 0> IF  T 1 cells - THEN  A, H  there tlast !
  360:   >in @ name, >in ! T here H tlastcfa !
  361:   CreateFlag @ IF
  362:   >in @ alias2 swap >in !         \ create alias in target
  363:   >in @ ghost swap >in !
  364:   swap also ghosts ' previous swap !        \ tick ghost and store in alias
  365:   CreateFlag off
  366:   ELSE ghost THEN
  367:   dup >magic ^imm !     \ a pointer for immediate
  368:   Already @ IF  dup >end tdoes !
  369:   ELSE 0 tdoes ! THEN
  370:   80 flag! ;
  371: 
  372: VARIABLE ;Resolve 1 cells allot
  373: 
  374: : Theader  ( "name" -- )     (THeader there resolve 0 ;Resolve ! ;
  375: 
  376: >TARGET
  377: : Alias    ( cfa -- ) \ name
  378:   (THeader over resolve T A, H 80 flag! ;
  379: >CROSS
  380: 
  381: \ Conditionals and Comments                            11may93jaw
  382: 
  383: : ;Cond
  384:   postpone ;
  385:   swap ! ;  immediate
  386: 
  387: : Cond: ( -- ) \ name {code } ;
  388:   atonce on
  389:   ghost
  390:   >exec
  391:   :NONAME ;
  392: 
  393: : restrict? ( -- )
  394: \ aborts on interprete state - ae
  395:   state @ 0= ABORT" CROSS: Restricted" ;
  396: 
  397: : Comment ( -- )
  398:   >in @ atonce on ghost swap >in ! ' swap >exec ! ;
  399: 
  400: Comment (       Comment \
  401: 
  402: \ Predefined ghosts                                    12dec92py
  403: 
  404: ghost 0=                                        drop
  405: ghost branch    ghost ?branch                   2drop
  406: ghost (do)      ghost (?do)                     2drop
  407: ghost (for)                                     drop
  408: ghost (loop)    ghost (+loop)                   2drop
  409: ghost (next)                                    drop
  410: ghost unloop    ghost ;S                        2drop
  411: ghost lit       ghost (compile) ghost !         2drop drop
  412: ghost (;code)   ghost noop                      2drop
  413: ghost (.")      ghost (S")      ghost (ABORT")  2drop drop
  414: 
  415: \ compile                                              10may93jaw
  416: 
  417: : compile  ( -- ) \ name
  418:   restrict?
  419:   name gfind dup 0= ABORT" CROSS: Can't compile "
  420:   0> ( immediate? )
  421:   IF    >exec @ compile,
  422:   ELSE  postpone literal postpone gexecute  THEN ;
  423:                                         immediate
  424: 
  425: >TARGET
  426: : '  ( -- cfa ) name gfind 0= ABORT" CROSS: undefined "
  427:   dup >magic @ <fwd> = ABORT" CROSS: forward " >link @ ;
  428: 
  429: Cond: [']  compile lit ghost gexecute ;Cond
  430: 
  431: >CROSS
  432: \ tLiteral                                             12dec92py
  433: 
  434: : lit, ( n -- )   compile lit T  ,  H ;
  435: : alit, ( n -- )  compile lit T A,  H ;
  436: 
  437: >TARGET
  438: Cond:  Literal ( n -- )   restrict? lit, ;Cond
  439: Cond: ALiteral ( n -- )   restrict? alit, ;Cond
  440: 
  441: : Char ( "<char>" -- )  bl word char+ c@ ;
  442: Cond: [Char]   ( "<char>" -- )  restrict? Char  lit, ;Cond
  443: 
  444: >CROSS
  445: \ Target compiling loop                                12dec92py
  446: \ ">tib trick thrown out                               10may93jaw
  447: \ number? defined at the top                           11may93jaw
  448: 
  449: \ compiled word might leave items on stack!
  450: : tcom ( in name -- )
  451:   gfind  ?dup  IF    0> IF    nip >exec @ execute
  452:                         ELSE  nip gexecute  THEN EXIT THEN
  453:   number? dup  IF    0> IF swap lit,  THEN  lit,  drop
  454:                ELSE  2drop >in !
  455:                ghost gexecute THEN  ;
  456: 
  457: >TARGET
  458: \ : ; DOES>                                            13dec92py
  459: \ ]                                                     9may93py/jaw
  460: 
  461: : ] state on
  462:     BEGIN
  463:         BEGIN >in @ name
  464:               dup c@ 0= WHILE 2drop refill 0=
  465:               ABORT" CROSS: End of file while target compiling"
  466:         REPEAT
  467:         tcom
  468:         state @
  469:         0=
  470:     UNTIL ;
  471: 
  472: \ by the way: defining a second interpreter (a compiler-)loop
  473: \             is not allowed if a system should be ans conform
  474: 
  475: : : ( -- colon-sys ) \ Name
  476:   (THeader ;Resolve ! there ;Resolve cell+ !
  477:   docol, depth T ] H ;
  478: 
  479: Cond: EXIT ( -- )  restrict?  compile ;S  ;Cond
  480: 
  481: Cond: ; ( -- ) restrict?
  482:                depth ?dup IF   1- <> ABORT" CROSS: Stack changed"
  483:                           ELSE true ABORT" CROSS: Stack empty" THEN
  484:                compile ;S state off
  485:                ;Resolve @
  486:                IF ;Resolve @ ;Resolve cell+ @ resolve THEN
  487:                ;Cond
  488: Cond: [  restrict? state off ;Cond
  489: 
  490: >CROSS
  491: : !does  :dodoes tlastcfa @ tuck T ! cell+ ! H ;
  492: 
  493: >TARGET
  494: Cond: DOES> restrict?
  495:         compile (;code) dodoes, tdoes @ ?dup IF  @ T here H resolve THEN
  496:         ;Cond
  497: : DOES> dodoes, T here H !does depth T ] H ;
  498: 
  499: >CROSS
  500: \ Creation                                             01nov92py
  501: 
  502: \ Builder                                               11may93jaw
  503: 
  504: : Builder    ( Create do: "name" -- )
  505:   >in @ alias2 swap dup >in ! >r >r
  506:   Make-Ghost rot swap >exec ! ,
  507:   r> r> >in !
  508:   also ghosts ' previous swap !
  509:   DOES> dup >exec @ execute ;
  510: 
  511: : gdoes,  ( ghost -- )  >end @ dup >magic @ <fwd> <>
  512:   IF dup >link @ dup 0< IF T A, 0 , H drop EXIT THEN drop THEN
  513:   :dodoes T A, H gexecute ;
  514: 
  515: : TCreate ( ghost -- )
  516:   CreateFlag on
  517:   Theader dup gdoes,
  518:   >end @ >exec @ execute ;
  519: 
  520: : Build:  ( -- [xt] [colon-sys] )
  521:   :noname  postpone TCreate ;
  522: 
  523: : gdoes>  ( ghost -- addr flag )
  524:   state @ IF  gexecute true EXIT  THEN
  525:   cell+ @ T >body H false ;
  526: 
  527: \ DO: ;DO                                               11may93jaw
  528: \ changed to ?EXIT                                      10may93jaw
  529: 
  530: : (does>)        postpone does> ; immediate \ second level does>
  531: 
  532: : DO:     ( -- addr [xt] [colon-sys] )
  533:   here ghostheader
  534:   :noname
  535:   postpone (does>) postpone gdoes> postpone ?EXIT ;
  536: 
  537: : ;DO ( addr [xt] [colon-sys] -- )
  538:   postpone ;    ( S addr xt )
  539:   over >exec ! ; immediate
  540: 
  541: : by      ( -- addr ) \ Name
  542:   ghost >end @ ;
  543: 
  544: >TARGET
  545: \ Variables and Constants                              05dec92py
  546: 
  547: Build:  ;
  548: DO: ( ghost -- addr ) ;DO
  549: Builder Create
  550: by Create :dovar resolve
  551: 
  552: Build: T 0 , H ;
  553: by Create
  554: Builder Variable
  555: 
  556: Build: T 0 A, H ;
  557: by Create
  558: Builder AVariable
  559: 
  560: \ User variables                                       04may94py
  561: 
  562: >CROSS
  563: Variable tup  0 tup !
  564: Variable tudp 0 tudp !
  565: : u,  ( n -- udp )
  566:   tup @ tudp @ + T  ! H
  567:   tudp @ dup cell+ tudp ! ;
  568: : au, ( n -- udp )
  569:   tup @ tudp @ + T A! H
  570:   tudp @ dup cell+ tudp ! ;
  571: >TARGET
  572: 
  573: Build: T 0 u, , H ;
  574: DO: ( ghost -- up-addr )  T @ H tup @ + ;DO
  575: Builder User
  576: by User :douser resolve
  577: 
  578: Build: T 0 u, , 0 u, drop H ;
  579: by User
  580: Builder 2User
  581: 
  582: Build: T 0 au, , H ;
  583: by User
  584: Builder AUser
  585: 
  586: Build:  ( n -- ) T , H ;
  587: DO: ( ghost -- n ) T @ H ;DO
  588: Builder Constant
  589: by Constant :docon resolve
  590: 
  591: Build:  ( n -- ) T A, H ;
  592: by Constant
  593: Builder AConstant
  594: 
  595: Build: T 0 , H ;
  596: by Constant
  597: Builder Value
  598: 
  599: Build:  ( -- ) compile noop ;
  600: DO: ( ghost -- ) ABORT" CROSS: Don't execute" ;DO
  601: Builder Defer
  602: 
  603: \ structural conditionals                              17dec92py
  604: 
  605: >CROSS
  606: : ?struc      ( flag -- )       ABORT" CROSS: unstructured " ;
  607: : sys?        ( sys -- sys )    dup 0= ?struc ;
  608: : >mark       ( -- sys )        T here  0 , H ;
  609: : >resolve    ( sys -- )        T here over - swap ! H ;
  610: : <resolve    ( sys -- )        T here - , H ;
  611: >TARGET
  612: 
  613: \ Structural Conditionals                              12dec92py
  614: 
  615: Cond: BUT       restrict? sys? swap ;Cond
  616: Cond: YET       restrict? sys? dup ;Cond
  617: 
  618: >CROSS
  619: Variable tleavings
  620: >TARGET
  621: 
  622: Cond: DONE   ( addr -- )  restrict? tleavings @
  623:       BEGIN  2dup u> 0=  WHILE  dup T @ H swap >resolve REPEAT
  624:       tleavings ! drop ;Cond
  625: 
  626: >CROSS
  627: : (leave  T here H tleavings @ T , H  tleavings ! ;
  628: >TARGET
  629: 
  630: Cond: LEAVE     restrict? compile branch (leave ;Cond
  631: Cond: ?LEAVE    restrict? compile 0=  compile ?branch (leave  ;Cond
  632: 
  633: \ Structural Conditionals                              12dec92py
  634: 
  635: Cond: AHEAD     restrict? compile branch >mark ;Cond
  636: Cond: IF        restrict? compile ?branch >mark ;Cond
  637: Cond: THEN      restrict? sys? dup T @ H ?struc >resolve ;Cond
  638: Cond: ELSE      restrict? sys? compile AHEAD swap compile THEN ;Cond
  639: 
  640: Cond: BEGIN     restrict? T here H ;Cond
  641: Cond: WHILE     restrict? sys? compile IF swap ;Cond
  642: Cond: AGAIN     restrict? sys? compile branch <resolve ;Cond
  643: Cond: UNTIL     restrict? sys? compile ?branch <resolve ;Cond
  644: Cond: REPEAT    restrict? over 0= ?struc compile AGAIN compile THEN ;Cond
  645: 
  646: \ Structural Conditionals                              12dec92py
  647: 
  648: Cond: DO        restrict? compile (do)   T here H ;Cond
  649: Cond: ?DO       restrict? compile (?do)  (leave T here H ;Cond
  650: Cond: FOR       restrict? compile (for)  T here H ;Cond
  651: 
  652: >CROSS
  653: : loop]   dup <resolve cell - compile DONE compile unloop ;
  654: >TARGET
  655: 
  656: Cond: LOOP      restrict? sys? compile (loop)  loop] ;Cond
  657: Cond: +LOOP     restrict? sys? compile (+loop) loop] ;Cond
  658: Cond: NEXT      restrict? sys? compile (next)  loop] ;Cond
  659: 
  660: \ String words                                         23feb93py
  661: 
  662: : ,"            [char] " parse string, T align H ;
  663: 
  664: Cond: ."        restrict? compile (.")     T ," H ;Cond
  665: Cond: S"        restrict? compile (S")     T ," H ;Cond
  666: Cond: ABORT"    restrict? compile (ABORT") T ," H ;Cond
  667: 
  668: Cond: IS        T ' >body H compile ALiteral compile ! ;Cond
  669: : IS            T ' >body ! H ;
  670: 
  671: \ LINKED ERR" ENV" 2ENV"                                18may93jaw
  672: 
  673: \ linked list primitive
  674: : linked        T here over @ A, swap ! H ;
  675: 
  676: : err"   s" ErrLink linked" evaluate T , H
  677:          [char] " parse string, T align H ;
  678: 
  679: : env"  [char] " parse s" EnvLink linked" evaluate
  680:         string, T align , H ;
  681: 
  682: : 2env" [char] " parse s" EnvLink linked" evaluate
  683:         here >r string, T align , , H
  684:         r> dup T c@ H 80 and swap T c! H ;
  685: 
  686: \ compile must be last                                 22feb93py
  687: 
  688: Cond: compile ( -- ) restrict? \ name
  689:       name gfind dup 0= ABORT" CROSS: Can't compile"
  690:       0> IF    gexecute
  691:          ELSE  dup >magic @ <imm> =
  692:                IF   gexecute
  693:                ELSE compile (compile) gexecute THEN THEN ;Cond
  694: 
  695: Cond: postpone ( -- ) restrict? \ name
  696:       name gfind dup 0= ABORT" CROSS: Can't compile"
  697:       0> IF    gexecute
  698:          ELSE  dup >magic @ <imm> =
  699:                IF   gexecute
  700:                ELSE compile (compile) gexecute THEN THEN ;Cond
  701: 
  702: >MINIMAL
  703: also minimal
  704: \ Usefull words                                        13feb93py
  705: 
  706: : KB  400 * ;
  707: 
  708: \ define new [IFDEF] and [IFUNDEF]                      20may93jaw
  709: 
  710: : there? name gfind IF >magic @ <fwd> <> ELSE drop false THEN ;
  711: 
  712: : [IFDEF] there? postpone [IF] ;
  713: : [IFUNDEF] there? 0= postpone [IF] ;
  714: 
  715: \ C: \- \+ Conditional Compiling                         09jun93jaw
  716: 
  717: : C: >in @ there? 0=
  718:      IF    >in ! T : H
  719:      ELSE drop
  720:         BEGIN bl word dup c@
  721:               IF   count comment? s" ;" compare 0= ?EXIT
  722:               ELSE refill 0= ABORT" CROSS: Out of Input while C:"
  723:               THEN
  724:         AGAIN
  725:      THEN ;
  726: 
  727: also minimal
  728: 
  729: : \- there? IF postpone \ THEN ;
  730: : \+ there? 0= IF postpone \ THEN ;
  731: 
  732: : [IF]   postpone [IF] ;
  733: : [THEN] postpone [THEN] ;
  734: : [ELSE] postpone [ELSE] ;
  735: 
  736: Cond: [IF]      [IF] ;Cond
  737: Cond: [IFDEF]   [IFDEF] ;Cond
  738: Cond: [IFUNDEF] [IFUNDEF] ;Cond
  739: Cond: [THEN]    [THEN] ;Cond
  740: Cond: [ELSE]    [ELSE] ;Cond
  741: 
  742: \ save-cross                                           17mar93py
  743: 
  744: \ i'm not interested in bigforth features this time    10may93jaw
  745: \ [IFDEF] file
  746: \ also file
  747: \ [THEN]
  748: \ included throw after create-file                     11may93jaw
  749: 
  750: endian Constant endian
  751: 
  752: : save-cross ( "name" -- )
  753:   bl parse ." Saving to " 2dup type
  754:   w/o bin create-file throw >r
  755:   image @ there r@ write-file throw
  756:   bit$  @ there 1- cell>bit rshift 1+ r@ write-file throw
  757:   r> close-file throw ;
  758: 
  759: \ words that should be in minimal
  760: 
  761: : + + ;         : 1- 1- ;
  762: : - - ;         : 2* 2* ;
  763: : dup dup ;     : over over ;
  764: : swap swap ;   : rot rot ;
  765: 
  766: \ include bug5.fs
  767: \ only forth also minimal definitions
  768: 
  769: : \ postpone \ ;
  770: : ( postpone ( ;
  771: : include bl word count included ;
  772: : .( [char] ) parse type ;
  773: : cr cr ;
  774: 
  775: : times 0 ?DO dup T c, H LOOP drop ; \ used for space table creation
  776: only forth also minimal definitions
  777: 
  778: \ cross-compiler words
  779: 
  780: : decimal       decimal ;
  781: : hex           hex ;
  782: 
  783: : tudp          T tudp H ;
  784: : tup           T tup H ;  minimal
  785: 
  786: \ for debugging...
  787: : order         order ;
  788: : words         words ;
  789: : .s            .s ;
  790: 
  791: : bye           bye ;
  792: 
  793: \ turnkey direction
  794: : H forth ; immediate
  795: : T minimal ; immediate
  796: : G ghosts ; immediate
  797: 
  798: : turnkey  0 set-order also Target definitions
  799:            also Minimal also ;
  800: 
  801: \ these ones are pefered:
  802: 
  803: : lock   turnkey ;
  804: : unlock forth also cross ;
  805: 
  806: unlock definitions also minimal
  807: : lock   lock ;
  808: lock

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