File:  [gforth] / gforth / Attic / kernal.fs
Revision 1.24: download - view: text, annotated - select for diffs
Tue Nov 15 15:55:39 1994 UTC (25 years ago) by pazsan
Branches: MAIN
CVS tags: HEAD
* Made slight modification in configure
* Select from make first and make more to allow first time compilation
* Added simple image dump and reload
* Added extended COLD functionality in 'COLD for image reboot
* Added boot procedures in hash.fs and history.fs

    1: \ KERNAL.FS    GNU FORTH kernal                        17dec92py
    2: \ $ID:
    3: \ Idea and implementation: Bernd Paysan (py)
    4: \ Copyright 1992 by the ANSI figForth Development Group
    5: 
    6: \ Log:  ', '- usw. durch [char] ... ersetzt
    7: \       man sollte die unterschiedlichen zahlensysteme
    8: \       mit $ und & zumindest im interpreter weglassen
    9: \       schon erledigt!
   10: \       11may93jaw
   11: \ name>         0= nicht vorhanden              17may93jaw
   12: \               nfa can be lfa or nfa!
   13: \ find          splited into find and (find)
   14: \               (find) for later use            17may93jaw
   15: \ search        replaced by lookup because
   16: \               it is a word of the string wordset
   17: \                                               20may93jaw
   18: \ postpone      added immediate                 21may93jaw
   19: \ to            added immediate                 07jun93jaw
   20: \ cfa, header   put "here lastcfa !" in
   21: \               cfa, this is more logical
   22: \               and noname: works wothout
   23: \               extra "here lastcfa !"          08jun93jaw
   24: \ (parse-white) thrown out
   25: \ refill        added outer trick
   26: \               to show there is something
   27: \               going on                        09jun93jaw
   28: \ leave ?leave  somebody forgot UNLOOP!!!       09jun93jaw
   29: \ leave ?leave  unloop thrown out
   30: \               unloop after loop is used       10jun93jaw
   31: 
   32: HEX
   33: 
   34: \ Bit string manipulation                              06oct92py
   35: 
   36: Create bits  80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
   37: DOES> ( n -- )  + c@ ;
   38: 
   39: : >bit  ( addr n -- c-addr mask )  8 /mod rot + swap bits ;
   40: : +bit  ( addr n -- )  >bit over c@ or swap c! ;
   41: 
   42: : relinfo ( -- addr )  forthstart dup @ + ;
   43: : >rel  ( addr -- n )  forthstart - ;
   44: : relon ( addr -- )  relinfo swap >rel cell / +bit ;
   45: 
   46: \ here allot , c, A,                                   17dec92py
   47: 
   48: : dp	( -- addr )  dpp @ ;
   49: : here  ( -- here )  dp @ ;
   50: : allot ( n -- )     dp +! ;
   51: : c,    ( c -- )     here 1 chars allot c! ;
   52: : ,     ( x -- )     here cell allot  ! ;
   53: : 2,    ( w1 w2 -- ) \ general
   54:     here 2 cells allot 2! ;
   55: 
   56: : aligned ( addr -- addr' )
   57:   [ cell 1- ] Literal + [ -1 cells ] Literal and ;
   58: : align ( -- )          here dup aligned swap ?DO  bl c,  LOOP ;
   59: 
   60: : faligned ( addr -- f-addr )
   61:   [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
   62: 
   63: : falign ( -- )
   64:   here dup faligned swap
   65:   ?DO
   66:       bl c,
   67:   LOOP ;
   68: 
   69: : chars ; immediate
   70: 
   71: : A!    ( addr1 addr2 -- )  dup relon ! ;
   72: : A,    ( addr -- )     here cell allot A! ;
   73: 
   74: \ on off                                               23feb93py
   75: 
   76: : on  ( addr -- )  true  swap ! ;
   77: : off ( addr -- )  false swap ! ;
   78: 
   79: \ name> found                                          17dec92py
   80: 
   81: : (name>)  ( nfa -- cfa )    count  $1F and  +  aligned ;
   82: : name>    ( nfa -- cfa )    cell+
   83:   dup  (name>) swap  c@ $80 and 0= IF  @ THEN ;
   84: 
   85: : found ( nfa -- cfa n )  cell+
   86:   dup c@ >r  (name>) r@ $80 and  0= IF  @       THEN
   87:                   -1 r@ $40 and     IF  1-      THEN
   88:                      r> $20 and     IF  negate  THEN  ;
   89: 
   90: \ (find)                                               17dec92py
   91: 
   92: \ : (find) ( addr count nfa1 -- nfa2 / false )
   93: \   BEGIN  dup  WHILE  dup >r
   94: \          cell+ count $1F and dup >r 2over r> =
   95: \          IF  -text  0= IF  2drop r> EXIT  THEN
   96: \          ELSE  2drop drop  THEN  r> @
   97: \   REPEAT nip nip ;
   98: 
   99: \ place bounds                                         13feb93py
  100: 
  101: : place  ( addr len to -- ) over >r  rot over 1+  r> move c! ;
  102: : bounds ( beg count -- end beg )  over + swap ;
  103: 
  104: \ input stream primitives                              23feb93py
  105: 
  106: : tib   >tib @ ;
  107: Defer source
  108: : (source) ( -- addr count ) tib #tib @ ;
  109: ' (source) IS source
  110: 
  111: \ (word)                                               22feb93py
  112: 
  113: : scan   ( addr1 n1 char -- addr2 n2 )
  114:     \ skip all characters not equal to char
  115:     >r
  116:     BEGIN
  117: 	dup
  118:     WHILE
  119: 	over c@ r@ <>
  120:     WHILE
  121: 	1 /string
  122:     REPEAT  THEN
  123:     rdrop ;
  124: : skip   ( addr1 n1 char -- addr2 n2 )
  125:     \ skip all characters equal to char
  126:     >r
  127:     BEGIN
  128: 	dup
  129:     WHILE
  130: 	over c@ r@  =
  131:     WHILE
  132: 	1 /string
  133:     REPEAT  THEN
  134:     rdrop ;
  135: 
  136: : (word) ( addr1 n1 char -- addr2 n2 )
  137:   dup >r skip 2dup r> scan  nip - ;
  138: 
  139: \ (word) should fold white spaces
  140: \ this is what (parse-white) does
  141: 
  142: \ word parse                                           23feb93py
  143: 
  144: : parse-word  ( char -- addr len )
  145:   source 2dup >r >r >in @ /string
  146:   rot dup bl = IF  drop (parse-white)  ELSE  (word)  THEN
  147:   2dup + r> - 1+ r> min >in ! ;
  148: : word   ( char -- addr )
  149:   parse-word here place  bl here count + c!  here ;
  150: 
  151: : parse    ( char -- addr len )
  152:   >r  source  >in @ /string  over  swap r>  scan >r
  153:   over - dup r> IF 1+ THEN  >in +! ;
  154: 
  155: \ name                                                 13feb93py
  156: 
  157: : capitalize ( addr len -- addr len )
  158:   2dup chars chars bounds
  159:   ?DO  I c@ toupper I c! 1 chars +LOOP ;
  160: : (name) ( -- c-addr count )
  161:     source 2dup >r >r >in @ /string (parse-white)
  162:     2dup + r> - 1+ r> min >in ! ;
  163: \    name count ;
  164: 
  165: \ Literal                                              17dec92py
  166: 
  167: : Literal  ( n -- )  state @ IF postpone lit  , THEN ;
  168:                                                       immediate
  169: : ALiteral ( n -- )  state @ IF postpone lit A, THEN ;
  170:                                                       immediate
  171: 
  172: : char   ( 'char' -- n )  bl word char+ c@ ;
  173: : [char] ( 'char' -- n )  char postpone Literal ; immediate
  174: ' [char] Alias Ascii immediate
  175: 
  176: : (compile) ( -- )  r> dup cell+ >r @ compile, ;
  177: : postpone ( "name" -- )
  178:   name sfind dup 0= abort" Can't compile "
  179:   0> IF  compile,  ELSE  postpone (compile) A,  THEN ;
  180:                                              immediate restrict
  181: 
  182: \ Use (compile) for the old behavior of compile!
  183: 
  184: \ digit?                                               17dec92py
  185: 
  186: : digit?   ( char -- digit true/ false )
  187:   base @ $100 =
  188:   IF
  189:     true EXIT
  190:   THEN
  191:   toupper [char] 0 - dup 9 u> IF
  192:     [ 'A '9 1 + -  ] literal -
  193:     dup 9 u<= IF
  194:       drop false EXIT
  195:     THEN
  196:   THEN
  197:   dup base @ u>= IF
  198:     drop false EXIT
  199:   THEN
  200:   true ;
  201: 
  202: : accumulate ( +d0 addr digit - +d1 addr )
  203:   swap >r swap  base @  um* drop rot  base @  um* d+ r> ;
  204: : >number ( d addr count -- d addr count )
  205:   0 ?DO  count digit? WHILE  accumulate  LOOP 0
  206:   ELSE  1- I' I - UNLOOP  THEN ;
  207: 
  208: \ number? number                                       23feb93py
  209: 
  210: Create bases   10 ,   2 ,   A , 100 ,
  211: \              16     2    10   Zeichen
  212: \ !! this saving and restoring base is an abomination! - anton
  213: : getbase ( addr u -- addr' u' )  over c@ [char] $ - dup 4 u<
  214:   IF  cells bases + @ base ! 1 /string  ELSE  drop  THEN ;
  215: : s>number ( addr len -- d )  base @ >r  dpl on
  216:   over c@ '- =  dup >r  IF  1 /string  THEN
  217:   getbase  dpl on  0 0 2swap
  218:   BEGIN  dup >r >number dup  WHILE  dup r> -  WHILE
  219:          dup dpl ! over c@ [char] . =  WHILE
  220:          1 /string
  221:   REPEAT  THEN  2drop rdrop dpl off  ELSE
  222:   2drop rdrop r> IF  dnegate  THEN
  223:   THEN r> base ! ;
  224: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
  225:     s>number dpl @ 0=
  226:     IF
  227: 	2drop false  EXIT
  228:     THEN
  229:     dpl @ dup 0> 0= IF
  230: 	nip
  231:     THEN ;
  232: : number? ( string -- string 0 / n -1 / d 0> )
  233:     dup >r count snumber? dup if
  234: 	rdrop
  235:     else
  236: 	r> swap
  237:     then ;
  238: : s>d ( n -- d ) dup 0< ;
  239: : number ( string -- d )
  240:   number? ?dup 0= abort" ?"  0< IF s>d THEN ;
  241: 
  242: \ space spaces ud/mod                                  21mar93py
  243: decimal
  244: Create spaces  bl 80 times \ times from target compiler! 11may93jaw
  245: DOES>   ( u -- )  swap
  246:         0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  247: Create backspaces  08 80 times \ times from target compiler! 11may93jaw
  248: DOES>   ( u -- )  swap
  249:         0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  250: hex
  251: : space   1 spaces ;
  252: 
  253: : ud/mod ( ud1 u2 -- urem udquot )  >r 0 r@ um/mod r> swap >r
  254:                                     um/mod r> ;
  255: 
  256: : pad    ( -- addr )
  257:   here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
  258: 
  259: \ hold <# #> sign # #s                                 25jan92py
  260: 
  261: : hold    ( char -- )         pad cell - -1 chars over +! @ c! ;
  262: 
  263: : <#                          pad cell - dup ! ;
  264: 
  265: : #>      ( 64b -- addr +n )  2drop pad cell - dup @ tuck - ;
  266: 
  267: : sign    ( n -- )            0< IF  [char] - hold  THEN ;
  268: 
  269: : #       ( +d1 -- +d2 )    base @ 2 max ud/mod rot 9 over <
  270:   IF [ char A char 9 - 1- ] Literal +  THEN  [char] 0 + hold ;
  271: 
  272: : #s      ( +d -- 0 0 )         BEGIN  # 2dup d0=  UNTIL ;
  273: 
  274: \ print numbers                                        07jun92py
  275: 
  276: : d.r      >r tuck  dabs  <# #s  rot sign #>
  277:            r> over - spaces  type ;
  278: 
  279: : ud.r     >r <# #s #> r> over - spaces type ;
  280: 
  281: : .r       >r s>d r> d.r ;
  282: : u.r      0 swap ud.r ;
  283: 
  284: : d.       0 d.r space ;
  285: : ud.      0 ud.r space ;
  286: 
  287: : .        s>d d. ;
  288: : u.       0 ud. ;
  289: 
  290: \ catch throw                                          23feb93py
  291: \ bounce                                                08jun93jaw
  292: 
  293: \ !! allow the user to add rollback actions    anton
  294: \ !! use a separate exception stack?           anton
  295: 
  296: : lp@ ( -- addr )
  297:  laddr# [ 0 , ] ;
  298: 
  299: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error )
  300:   >r sp@ r> swap >r       \ don't count xt! jaw
  301:   fp@ >r
  302:   lp@ >r
  303:   handler @ >r
  304:   rp@ handler !
  305:   execute
  306:   r> handler ! rdrop rdrop rdrop 0 ;
  307: 
  308: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error )
  309:     ?DUP IF
  310: 	[ here 4 cells ! ]
  311: 	handler @ rp!
  312: 	r> handler !
  313: 	r> lp!
  314: 	r> fp!
  315: 	r> swap >r sp! r>
  316:     THEN ;
  317: 
  318: \ Bouncing is very fine,
  319: \ programming without wasting time...   jaw
  320: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym )
  321: \ a throw without data or fp stack restauration
  322:   ?DUP IF
  323:     handler @ rp!
  324:     r> handler !
  325:     r> lp!
  326:     rdrop
  327:     rdrop
  328:   THEN ;
  329: 
  330: \ ?stack                                               23feb93py
  331: 
  332: : ?stack ( ?? -- ?? )  sp@ s0 @ > IF  -4 throw  THEN ;
  333: \ ?stack should be code -- it touches an empty stack!
  334: 
  335: \ interpret                                            10mar92py
  336: 
  337: Defer parser
  338: Defer name      ' (name) IS name
  339: Defer notfound ( c-addr count -- )
  340: 
  341: : no.extensions  ( addr u -- )  2drop -&13 bounce ;
  342: 
  343: ' no.extensions IS notfound
  344: 
  345: : interpret
  346:     BEGIN
  347: 	?stack name dup
  348:     WHILE
  349: 	parser
  350:     REPEAT
  351:     2drop ;
  352: 
  353: \ interpreter compiler                                 30apr92py
  354: 
  355: : interpreter  ( c-addr u -- ) 
  356:     \ interpretation semantics for the name/number c-addr u
  357:     2dup sfind dup
  358:     IF
  359: 	1 and
  360: 	IF \ not restricted to compile state?
  361: 	    nip nip execute  EXIT
  362: 	THEN
  363: 	-&14 throw
  364:     THEN
  365:     drop
  366:     2dup 2>r snumber?
  367:     IF
  368: 	2rdrop
  369:     ELSE
  370: 	2r> notfound
  371:     THEN ;
  372: 
  373: ' interpreter  IS  parser
  374: 
  375: : compiler     ( c-addr u -- )
  376:     \ compilation semantics for the name/number c-addr u
  377:     2dup sfind dup
  378:     IF
  379: 	0>
  380: 	IF
  381: 	    nip nip execute EXIT
  382: 	THEN
  383: 	compile, 2drop EXIT
  384:     THEN
  385:     drop
  386:     2dup snumber? dup
  387:     IF
  388: 	0>
  389: 	IF
  390: 	    swap postpone Literal
  391: 	THEN
  392: 	postpone Literal
  393: 	2drop
  394:     ELSE
  395: 	drop notfound
  396:     THEN ;
  397: 
  398: : [     ['] interpreter  IS parser state off ; immediate
  399: : ]     ['] compiler     IS parser state on  ;
  400: 
  401: \ locals stuff needed for control structures
  402: 
  403: : compile-lp+! ( n -- )
  404:     dup negate locals-size +!
  405:     0 over = if
  406:     else -1 cells  over = if postpone lp-
  407:     else  1 floats over = if postpone lp+
  408:     else  2 floats over = if postpone lp+2
  409:     else postpone lp+!# dup ,
  410:     then then then then drop ;
  411: 
  412: : adjust-locals-size ( n -- )
  413:     \ sets locals-size to n and generates an appropriate lp+!
  414:     locals-size @ swap - compile-lp+! ;
  415: 
  416: 
  417: here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs
  418: AConstant locals-list \ acts like a variable that contains
  419: 		      \ a linear list of locals names
  420: 
  421: 
  422: variable dead-code \ true if normal code at "here" would be dead
  423: variable backedge-locals
  424:     \ contains the locals list that BEGIN will assume to be live on
  425:     \ the back edge if the BEGIN is unreachable from above. Set by
  426:     \ ASSUME-LIVE, reset by UNREACHABLE.
  427: 
  428: : UNREACHABLE ( -- )
  429:     \ declares the current point of execution as unreachable
  430:     dead-code on
  431:     0 backedge-locals ! ; immediate
  432: 
  433: : ASSUME-LIVE ( orig -- orig )
  434:     \ used immediateliy before a BEGIN that is not reachable from
  435:     \ above.  causes the BEGIN to assume that the same locals are live
  436:     \ as at the orig point
  437:     dup orig?
  438:     2 pick backedge-locals ! ; immediate
  439:     
  440: \ locals list operations
  441: 
  442: : common-list ( list1 list2 -- list3 )
  443: \ list1 and list2 are lists, where the heads are at higher addresses than
  444: \ the tail. list3 is the largest sublist of both lists.
  445:  begin
  446:    2dup u<>
  447:  while
  448:    2dup u>
  449:    if
  450:      swap
  451:    then
  452:    @
  453:  repeat
  454:  drop ;
  455: 
  456: : sub-list? ( list1 list2 -- f )
  457: \ true iff list1 is a sublist of list2
  458:  begin
  459:    2dup u<
  460:  while
  461:    @
  462:  repeat
  463:  = ;
  464: 
  465: : list-size ( list -- u )
  466: \ size of the locals frame represented by list
  467:  0 ( list n )
  468:  begin
  469:    over 0<>
  470:  while
  471:    over
  472:    name> >body @ max
  473:    swap @ swap ( get next )
  474:  repeat
  475:  faligned nip ;
  476: 
  477: : set-locals-size-list ( list -- )
  478:  dup locals-list !
  479:  list-size locals-size ! ;
  480: 
  481: : check-begin ( list -- )
  482: \ warn if list is not a sublist of locals-list
  483:  locals-list @ sub-list? 0= if
  484:    \ !! print current position
  485:    ." compiler was overly optimistic about locals at a BEGIN" cr
  486:    \ !! print assumption and reality
  487:  then ;
  488: 
  489: \ Control Flow Stack
  490: \ orig, etc. have the following structure:
  491: \ type ( defstart, live-orig, dead-orig, dest, do-dest, scopestart) ( TOS )
  492: \ address (of the branch or the instruction to be branched to) (second)
  493: \ locals-list (valid at address) (third)
  494: 
  495: \ types
  496: 0 constant defstart
  497: 1 constant live-orig
  498: 2 constant dead-orig
  499: 3 constant dest \ the loopback branch is always assumed live
  500: 4 constant do-dest
  501: 5 constant scopestart
  502: 
  503: : def? ( n -- )
  504:     defstart <> abort" unstructured " ;
  505: 
  506: : orig? ( n -- )
  507:  dup live-orig <> swap dead-orig <> and abort" expected orig " ;
  508: 
  509: : dest? ( n -- )
  510:  dest <> abort" expected dest " ;
  511: 
  512: : do-dest? ( n -- )
  513:  do-dest <> abort" expected do-dest " ;
  514: 
  515: : scope? ( n -- )
  516:  scopestart <> abort" expected scope " ;
  517: 
  518: : non-orig? ( n -- )
  519:  dest scopestart 1+ within 0= abort" expected dest, do-dest or scope" ;
  520: 
  521: : cs-item? ( n -- )
  522:  live-orig scopestart 1+ within 0= abort" expected control flow stack item" ;
  523: 
  524: 3 constant cs-item-size
  525: 
  526: : CS-PICK ( ... u -- ... destu )
  527:  1+ cs-item-size * 1- >r
  528:  r@ pick  r@ pick  r@ pick
  529:  rdrop
  530:  dup non-orig? ;
  531: 
  532: : CS-ROLL ( destu/origu .. dest0/orig0 u -- .. dest0/orig0 destu/origu )
  533:  1+ cs-item-size * 1- >r
  534:  r@ roll r@ roll r@ roll
  535:  rdrop
  536:  dup cs-item? ; 
  537: 
  538: : cs-push-part ( -- list addr )
  539:  locals-list @ here ;
  540: 
  541: : cs-push-orig ( -- orig )
  542:  cs-push-part dead-code @
  543:  if
  544:    dead-orig
  545:  else
  546:    live-orig
  547:  then ;   
  548: 
  549: \ Structural Conditionals                              12dec92py
  550: 
  551: : ?struc      ( flag -- )       abort" unstructured " ;
  552: : sys?        ( sys -- )        dup 0= ?struc ;
  553: : >mark ( -- orig )
  554:  cs-push-orig 0 , ;
  555: : >resolve    ( addr -- )        here over - swap ! ;
  556: : <resolve    ( addr -- )        here - , ;
  557: 
  558: : BUT       1 cs-roll ;                      immediate restrict
  559: : YET       0 cs-pick ;                       immediate restrict
  560: 
  561: \ Structural Conditionals                              12dec92py
  562: 
  563: : AHEAD ( -- orig )
  564:  POSTPONE branch >mark POSTPONE unreachable ; immediate restrict
  565: 
  566: : IF ( -- orig )
  567:  POSTPONE ?branch >mark ; immediate restrict
  568: 
  569: : ?DUP-IF \ general
  570: \ This is the preferred alternative to the idiom "?DUP IF", since it can be
  571: \ better handled by tools like stack checkers
  572:     POSTPONE ?dup POSTPONE if ;       immediate restrict
  573: : ?DUP-0=-IF \ general
  574:     POSTPONE ?dup POSTPONE 0= POSTPONE if ; immediate restrict
  575: 
  576: : THEN ( orig -- )
  577:     dup orig?
  578:     dead-orig =
  579:     if
  580:         >resolve drop
  581:     else
  582:         dead-code @
  583:         if
  584: 	    >resolve set-locals-size-list dead-code off
  585: 	else \ both live
  586: 	    over list-size adjust-locals-size
  587: 	    >resolve
  588: 	    locals-list @ common-list dup list-size adjust-locals-size
  589: 	    locals-list !
  590: 	then
  591:     then ; immediate restrict
  592: 
  593: ' THEN alias ENDIF immediate restrict \ general
  594: \ Same as "THEN". This is what you use if your program will be seen by
  595: \ people who have not been brought up with Forth (or who have been
  596: \ brought up with fig-Forth).
  597: 
  598: : ELSE ( orig1 -- orig2 )
  599:     POSTPONE ahead
  600:     1 cs-roll
  601:     POSTPONE then ; immediate restrict
  602: 
  603: 
  604: : BEGIN ( -- dest )
  605:     dead-code @ if
  606: 	\ set up an assumption of the locals visible here.  if the
  607: 	\ users want something to be visible, they have to declare
  608: 	\ that using ASSUME-LIVE
  609: 	backedge-locals @ set-locals-size-list
  610:     then
  611:     cs-push-part dest
  612:     dead-code off ; immediate restrict
  613: 
  614: \ AGAIN (the current control flow joins another, earlier one):
  615: \ If the dest-locals-list is not a subset of the current locals-list,
  616: \ issue a warning (see below). The following code is generated:
  617: \ lp+!# (current-local-size - dest-locals-size)
  618: \ branch <begin>
  619: : AGAIN ( dest -- )
  620:     dest?
  621:     over list-size adjust-locals-size
  622:     POSTPONE branch
  623:     <resolve
  624:     check-begin
  625:     POSTPONE unreachable ; immediate restrict
  626: 
  627: \ UNTIL (the current control flow may join an earlier one or continue):
  628: \ Similar to AGAIN. The new locals-list and locals-size are the current
  629: \ ones. The following code is generated:
  630: \ ?branch-lp+!# <begin> (current-local-size - dest-locals-size)
  631: : until-like ( list addr xt1 xt2 -- )
  632:     \ list and addr are a fragment of a cs-item
  633:     \ xt1 is the conditional branch without lp adjustment, xt2 is with
  634:     >r >r
  635:     locals-size @ 2 pick list-size - dup if ( list dest-addr adjustment )
  636: 	r> drop r> compile,
  637: 	swap <resolve ( list adjustment ) ,
  638:     else ( list dest-addr adjustment )
  639: 	drop
  640: 	r> compile, <resolve
  641: 	r> drop
  642:     then ( list )
  643:     check-begin ;
  644: 
  645: : UNTIL ( dest -- )
  646:     dest? ['] ?branch ['] ?branch-lp+!# until-like ; immediate restrict
  647: 
  648: : WHILE ( dest -- orig dest )
  649:     POSTPONE if
  650:     1 cs-roll ; immediate restrict
  651: 
  652: : REPEAT ( orig dest -- )
  653:     POSTPONE again
  654:     POSTPONE then ; immediate restrict
  655: 
  656: 
  657: \ counted loops
  658: 
  659: \ leave poses a little problem here
  660: \ we have to store more than just the address of the branch, so the
  661: \ traditional linked list approach is no longer viable.
  662: \ This is solved by storing the information about the leavings in a
  663: \ special stack.
  664: 
  665: \ !! remove the fixed size limit. 'Tis not hard.
  666: 20 constant leave-stack-size
  667: create leave-stack  60 cells allot
  668: Avariable leave-sp  leave-stack 3 cells + leave-sp !
  669: 
  670: : clear-leave-stack ( -- )
  671:     leave-stack leave-sp ! ;
  672: 
  673: \ : leave-empty? ( -- f )
  674: \  leave-sp @ leave-stack = ;
  675: 
  676: : >leave ( orig -- )
  677:     \ push on leave-stack
  678:     leave-sp @
  679:     dup [ leave-stack 60 cells + ] Aliteral
  680:     >= abort" leave-stack full"
  681:     tuck ! cell+
  682:     tuck ! cell+
  683:     tuck ! cell+
  684:     leave-sp ! ;
  685: 
  686: : leave> ( -- orig )
  687:     \ pop from leave-stack
  688:     leave-sp @
  689:     dup leave-stack <= IF
  690:        drop 0 0 0  EXIT  THEN
  691:     cell - dup @ swap
  692:     cell - dup @ swap
  693:     cell - dup @ swap
  694:     leave-sp ! ;
  695: 
  696: : DONE ( orig -- )  drop >r drop
  697:     \ !! the original done had ( addr -- )
  698:     begin
  699: 	leave>
  700: 	over r@ u>=
  701:     while
  702: 	POSTPONE then
  703:     repeat
  704:     >leave rdrop ; immediate restrict
  705: 
  706: : LEAVE ( -- )
  707:     POSTPONE ahead
  708:     >leave ; immediate restrict
  709: 
  710: : ?LEAVE ( -- )
  711:     POSTPONE 0= POSTPONE if
  712:     >leave ; immediate restrict
  713: 
  714: : DO ( -- do-sys )
  715:     POSTPONE (do)
  716:     POSTPONE begin drop do-dest
  717:     ( 0 0 0 >leave ) ; immediate restrict
  718: 
  719: : ?DO ( -- do-sys )
  720:     ( 0 0 0 >leave )
  721:     POSTPONE (?do)
  722:     >mark >leave
  723:     POSTPONE begin drop do-dest ; immediate restrict
  724: 
  725: : FOR ( -- do-sys )
  726:     POSTPONE (for)
  727:     POSTPONE begin drop do-dest
  728:     ( 0 0 0 >leave ) ; immediate restrict
  729: 
  730: \ LOOP etc. are just like UNTIL
  731: 
  732: : loop-like ( do-sys xt1 xt2 -- )
  733:     >r >r 0 cs-pick swap cell - swap 1 cs-roll r> r> rot do-dest?
  734:     until-like  POSTPONE done  POSTPONE unloop ;
  735: 
  736: : LOOP ( do-sys -- )
  737:  ['] (loop) ['] (loop)-lp+!# loop-like ; immediate restrict
  738: 
  739: : +LOOP ( do-sys -- )
  740:  ['] (+loop) ['] (+loop)-lp+!# loop-like ; immediate restrict
  741: 
  742: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP"
  743: \ will iterate as often as "high low ?DO inc S+LOOP". For positive
  744: \ increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for
  745: \ negative increments.
  746: : S+LOOP ( do-sys -- )
  747:  ['] (s+loop) ['] (s+loop)-lp+!# loop-like ; immediate restrict
  748: 
  749: : NEXT ( do-sys -- )
  750:  ['] (next) ['] (next)-lp+!# loop-like ; immediate restrict
  751: 
  752: \ Structural Conditionals                              12dec92py
  753: 
  754: : EXIT ( -- )
  755:     0 adjust-locals-size
  756:     POSTPONE ;s
  757:     POSTPONE unreachable ; immediate restrict
  758: 
  759: : ?EXIT ( -- )
  760:      POSTPONE if POSTPONE exit POSTPONE then ; immediate restrict
  761: 
  762: \ Strings                                              22feb93py
  763: 
  764: : ," ( "string"<"> -- ) [char] " parse
  765:   here over char+ allot  place align ;
  766: : "lit ( -- addr )
  767:   r> r> dup count + aligned >r swap >r ;               restrict
  768: : (.")     "lit count type ;                           restrict
  769: : (S")     "lit count ;                                restrict
  770: : SLiteral postpone (S") here over char+ allot  place align ;
  771:                                              immediate restrict
  772: : S"       [char] " parse  state @ IF  postpone SLiteral  THEN ;
  773:                                              immediate
  774: : ."       state @  IF    postpone (.") ,"  align
  775:                     ELSE  [char] " parse type  THEN  ;  immediate
  776: : (        [char] ) parse 2drop ;                       immediate
  777: : \        blk @ IF  >in @ c/l / 1+ c/l * >in !  EXIT  THEN
  778:            source >in ! drop ;                          immediate
  779: 
  780: \ error handling                                       22feb93py
  781: \ 'abort thrown out!                                   11may93jaw
  782: 
  783: : (abort")      "lit >r IF  r> "error ! -2 throw  THEN
  784:                 rdrop ;
  785: : abort"        postpone (abort") ," ;        immediate restrict
  786: 
  787: \ Header states                                        23feb93py
  788: 
  789: : flag! ( 8b -- )
  790:     last @ dup 0= abort" last word was headerless"
  791:     cell+ tuck c@ xor swap c! ;
  792: : immediate     $20 flag! ;
  793: : restrict      $40 flag! ;
  794: \ ' noop alias restrict
  795: 
  796: \ Header                                               23feb93py
  797: 
  798: \ input-stream, nextname and noname are quite ugly (passing
  799: \ information through global variables), but they are useful for dealing
  800: \ with existing/independent defining words
  801: 
  802: defer (header)
  803: defer header     ' (header) IS header
  804: 
  805: : name,  ( "name" -- )
  806:     name
  807:     dup $1F u> -&19 and throw ( is name too long? )
  808:     dup c,  here swap chars  dup allot  move  align ;
  809: : input-stream-header ( "name" -- )
  810:     \ !! this is f83-implementation-dependent
  811:     align here last !  -1 A,
  812:     name, $80 flag! ;
  813: 
  814: : input-stream ( -- )  \ general
  815: \ switches back to getting the name from the input stream ;
  816:     ['] input-stream-header IS (header) ;
  817: 
  818: ' input-stream-header IS (header)
  819: 
  820: \ !! make that a 2variable
  821: create nextname-buffer 32 chars allot
  822: 
  823: : nextname-header ( -- )
  824:     \ !! f83-implementation-dependent
  825:     nextname-buffer count
  826:     align here last ! -1 A,
  827:     dup c,  here swap chars  dup allot  move  align
  828:     $80 flag!
  829:     input-stream ;
  830: 
  831: \ the next name is given in the string
  832: : nextname ( c-addr u -- ) \ general
  833:     dup $1F u> -&19 and throw ( is name too long? )
  834:     nextname-buffer c! ( c-addr )
  835:     nextname-buffer count move
  836:     ['] nextname-header IS (header) ;
  837: 
  838: : noname-header ( -- )
  839:     0 last !
  840:     input-stream ;
  841: 
  842: : noname ( -- ) \ general
  843: \ the next defined word remains anonymous. The xt of that word is given by lastxt
  844:     ['] noname-header IS (header) ;
  845: 
  846: : lastxt ( -- xt ) \ general
  847: \ xt is the execution token of the last word defined. The main purpose of this word is to get the xt of words defined using noname
  848:     lastcfa @ ;
  849: 
  850: : Alias    ( cfa "name" -- )
  851:   Header reveal , $80 flag! ;
  852: 
  853: : name>string ( nfa -- addr count )
  854:  cell+ count $1F and ;
  855: 
  856: Create ???  0 , 3 c, char ? c, char ? c, char ? c,
  857: : >name ( cfa -- nfa )
  858:  $21 cell do
  859:    dup i - count $9F and + aligned over $80 + = if
  860:      i - cell - unloop exit
  861:    then
  862:  cell +loop
  863:  drop ??? ( wouldn't 0 be better? ) ;
  864: 
  865: \ indirect threading                                   17mar93py
  866: 
  867: : cfa,     ( code-address -- )
  868:     here lastcfa !
  869:     here  0 A, 0 ,  code-address! ;
  870: : compile, ( xt -- )		A, ;
  871: : !does    ( addr -- )		lastcfa @ does-code! ;
  872: : (;code)  ( R: addr -- )	r> /does-handler + !does ;
  873: : dodoes,  ( -- )
  874:   here /does-handler allot does-handler! ;
  875: 
  876: \ direct threading is implementation dependent
  877: 
  878: : Create    Header reveal [ :dovar ] Literal cfa, ;
  879: 
  880: \ DOES>                                                17mar93py
  881: 
  882: : DOES>  ( compilation: -- )
  883:     state @
  884:     IF
  885: 	;-hook postpone (;code) dodoes,
  886:     ELSE
  887: 	dodoes, here !does 0 ]
  888:     THEN 
  889:     :-hook ; immediate
  890: 
  891: \ Create Variable User Constant                        17mar93py
  892: 
  893: : Variable  Create 0 , ;
  894: : AVariable Create 0 A, ;
  895: : 2VARIABLE ( "name" -- ) \ double
  896:     create 0 , 0 , ;
  897:     
  898: : User      Variable ;
  899: : AUser     AVariable ;
  900: 
  901: : (Constant)  Header reveal [ :docon ] Literal cfa, ;
  902: : Constant  (Constant) , ;
  903: : AConstant (Constant) A, ;
  904: 
  905: : 2CONSTANT
  906:     create ( w1 w2 "name" -- )
  907:         2,
  908:     does> ( -- w1 w2 )
  909:         2@ ;
  910:     
  911: \ IS Defer What's Defers TO                            24feb93py
  912: 
  913: : Defer ( -- )
  914:     \ !! shouldn't it be initialized with abort or something similar?
  915:     Header Reveal [ :dodefer ] Literal cfa,
  916:     ['] noop A, ;
  917: \     Create ( -- ) 
  918: \ 	['] noop A,
  919: \     DOES> ( ??? )
  920: \ 	@ execute ;
  921: 
  922: : IS ( addr "name" -- )
  923:     ' >body
  924:     state @
  925:     IF    postpone ALiteral postpone !  
  926:     ELSE  !
  927:     THEN ;  immediate
  928: ' IS Alias TO immediate
  929: 
  930: : What's ( "name" -- addr )  ' >body
  931:   state @ IF  postpone ALiteral postpone @  ELSE  @  THEN ;
  932:                                              immediate
  933: : Defers ( "name" -- )  ' >body @ compile, ;
  934:                                              immediate
  935: 
  936: \ : ;                                                  24feb93py
  937: 
  938: defer :-hook ( sys1 -- sys2 )
  939: defer ;-hook ( sys2 -- sys1 )
  940: 
  941: : : ( -- colon-sys )  Header [ :docol ] Literal cfa, defstart ] :-hook ;
  942: : ; ( colon-sys -- )  ;-hook ?struc postpone exit reveal postpone [ ;
  943:   immediate restrict
  944: 
  945: : :noname ( -- xt colon-sys )
  946:     0 last !
  947:     here [ :docol ] Literal cfa, 0 ] :-hook ;
  948: 
  949: \ Search list handling                                 23feb93py
  950: 
  951: AVariable current
  952: 
  953: : last?   ( -- false / nfa nfa )    last @ ?dup ;
  954: : (reveal) ( -- )
  955:   last?
  956:   IF
  957:       dup @ 0<
  958:       IF
  959: 	current @ @ over ! current @ !
  960:       ELSE
  961: 	drop
  962:       THEN
  963:   THEN ;
  964: 
  965: \ object oriented search list                          17mar93py
  966: 
  967: \ word list structure:
  968: \ struct
  969: \   1 cells: field find-method   \ xt: ( c_addr u wid -- name-id )
  970: \   1 cells: field reveal-method \ xt: ( -- )
  971: \   1 cells: field rehash-method \ xt: ( wid -- )
  972: \   \ !! what else
  973: \ end-struct wordlist-map-struct
  974: 
  975: \ struct
  976: \   1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
  977: \   1 cells: field wordlist-map \ pointer to a wordlist-map-struct
  978: \   1 cells: field wordlist-link \ link field to other wordlists
  979: \   1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
  980: \ end-struct wordlist-struct
  981: 
  982: : f83find      ( addr len wordlist -- nfa / false )  @ (f83find) ;
  983: 
  984: \ Search list table: find reveal
  985: Create f83search       ' f83find A,  ' (reveal) A,  ' drop A,
  986: 
  987: Create forth-wordlist  NIL A, G f83search T A, NIL A, NIL A,
  988: AVariable lookup       G forth-wordlist lookup T !
  989: G forth-wordlist current T !
  990: 
  991: : (search-wordlist)  ( addr count wid -- nfa / false )
  992:   dup cell+ @ @ execute ;
  993: 
  994: : search-wordlist  ( addr count wid -- 0 / xt +-1 )
  995:   (search-wordlist) dup  IF  found  THEN ;
  996: 
  997: Variable warnings  G -1 warnings T !
  998: 
  999: : check-shadow  ( addr count wid -- )
 1000: \ prints a warning if the string is already present in the wordlist
 1001: \ !! should be refined so the user can suppress the warnings
 1002:  >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
 1003:    ." redefined " name>string 2dup type
 1004:    compare 0<> if
 1005:      ."  with " type
 1006:    else
 1007:      2drop
 1008:    then
 1009:    space space EXIT
 1010:  then
 1011:  2drop 2drop ;
 1012: 
 1013: : sfind ( c-addr u -- xt n / 0 )
 1014:     lookup @ search-wordlist ;
 1015: 
 1016: : find   ( addr -- cfa +-1 / string false )
 1017:     \ !! not ANS conformant: returns +-2 for restricted words
 1018:     dup count sfind dup if
 1019: 	rot drop
 1020:     then ;
 1021: 
 1022: : reveal ( -- )
 1023:  last? if
 1024:    name>string current @ check-shadow
 1025:  then
 1026:  current @ cell+ @ cell+ @ execute ;
 1027: 
 1028: : rehash  ( wid -- )  dup cell+ @ cell+ cell+ @ execute ;
 1029: 
 1030: : '    ( "name" -- addr )  name sfind 0= if -&13 bounce then ;
 1031: : [']  ( "name" -- addr )  ' postpone ALiteral ; immediate
 1032: \ Input                                                13feb93py
 1033: 
 1034: 07 constant #bell
 1035: 08 constant #bs
 1036: 09 constant #tab
 1037: 7F constant #del
 1038: 0D constant #cr                \ the newline key code
 1039: 0C constant #ff
 1040: 0A constant #lf
 1041: 
 1042: : bell  #bell emit ;
 1043: 
 1044: \ : backspaces  0 ?DO  #bs emit  LOOP ;
 1045: : >string  ( span addr pos1 -- span addr pos1 addr2 len )
 1046:   over 3 pick 2 pick chars /string ;
 1047: : type-rest ( span addr pos1 -- span addr pos1 back )
 1048:   >string tuck type ;
 1049: : (del)  ( max span addr pos1 -- max span addr pos2 )
 1050:   1- >string over 1+ -rot move
 1051:   rot 1- -rot  #bs emit  type-rest bl emit 1+ backspaces ;
 1052: : (ins)  ( max span addr pos1 char -- max span addr pos2 )
 1053:   >r >string over 1+ swap move 2dup chars + r> swap c!
 1054:   rot 1+ -rot type-rest 1- backspaces 1+ ;
 1055: : ?del ( max span addr pos1 -- max span addr pos2 0 )
 1056:   dup  IF  (del)  THEN  0 ;
 1057: : (ret)  type-rest drop true space ;
 1058: : back  dup  IF  1- #bs emit  ELSE  #bell emit  THEN 0 ;
 1059: : forw 2 pick over <> IF  2dup + c@ emit 1+  ELSE  #bell emit  THEN 0 ;
 1060: 
 1061: Create ctrlkeys
 1062:   ] false false back  false  false false forw  false
 1063:     ?del  false (ret) false  false (ret) false false
 1064:     false false false false  false false false false
 1065:     false false false false  false false false false [
 1066: 
 1067: defer everychar
 1068: ' noop IS everychar
 1069: 
 1070: : decode ( max span addr pos1 key -- max span addr pos2 flag )
 1071:   everychar
 1072:   dup #del = IF  drop #bs  THEN  \ del is rubout
 1073:   dup bl <   IF  cells ctrlkeys + @ execute  EXIT  THEN
 1074:   >r 2over = IF  rdrop bell 0 EXIT  THEN
 1075:   r> (ins) 0 ;
 1076: 
 1077: \ decode should better use a table for control key actions
 1078: \ to define keyboard bindings later
 1079: 
 1080: : accept   ( addr len -- len )
 1081:   dup 0< IF    abs over dup 1 chars - c@ tuck type 
 1082: \ this allows to edit given strings
 1083:          ELSE  0  THEN rot over
 1084:   BEGIN  key decode  UNTIL
 1085:   2drop nip ;
 1086: 
 1087: \ Output                                               13feb93py
 1088: 
 1089: Defer type      \ defer type for a output buffer or fast
 1090:                 \ screen write
 1091: 
 1092: \ : (type) ( addr len -- )
 1093: \   bounds ?DO  I c@ emit  LOOP ;
 1094: 
 1095: ' (type) IS Type
 1096: 
 1097: Defer emit
 1098: 
 1099: ' (Emit) IS Emit
 1100: 
 1101: Defer key
 1102: ' (key) IS key
 1103: 
 1104: \ : form  ( -- rows cols )  &24 &80 ;
 1105: \ form should be implemented using TERMCAPS or CURSES
 1106: \ : rows  form drop ;
 1107: \ : cols  form nip  ;
 1108: 
 1109: \ Query                                                07apr93py
 1110: 
 1111: : refill ( -- flag )
 1112:   blk @  IF  1 blk +!  true  EXIT  THEN
 1113:   tib /line
 1114:   loadfile @ ?dup
 1115:   IF    read-line throw
 1116:   ELSE  loadline @ 0< IF 2drop false EXIT THEN
 1117:         accept true
 1118:   THEN
 1119:   1 loadline +!
 1120:   swap #tib ! 0 >in ! ;
 1121: 
 1122: : Query  ( -- )  loadfile off  blk off  refill drop ;
 1123: 
 1124: \ File specifiers                                       11jun93jaw
 1125: 
 1126: 
 1127: \ 1 c, here char r c, 0 c,                0 c, 0 c, char b c, 0 c,
 1128: \ 2 c, here char r c, char + c, 0 c,
 1129: \ 2 c, here char w c, char + c, 0 c, align
 1130: 4 Constant w/o
 1131: 2 Constant r/w
 1132: 0 Constant r/o
 1133: 
 1134: \ BIN WRITE-LINE                                        11jun93jaw
 1135: 
 1136: \ : bin           dup 1 chars - c@
 1137: \                 r/o 4 chars + over - dup >r swap move r> ;
 1138: 
 1139: : bin  1+ ;
 1140: 
 1141: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
 1142:                            \ or not unix environments if
 1143:                            \ bin is not selected
 1144: 
 1145: : write-line    dup >r write-file ?dup IF r> drop EXIT THEN
 1146:                 nl$ count r> write-file ;
 1147: 
 1148: \ include-file                                         07apr93py
 1149: 
 1150: : push-file  ( -- )  r>
 1151:   loadline @ >r loadfile @ >r
 1152:   blk @ >r >tib @ >r  #tib @ dup >r  >tib +!  >in @ >r  >r ;
 1153: 
 1154: : pop-file   ( throw-code -- throw-code )
 1155:   dup IF
 1156:          source >in @ loadline @ loadfilename 2@
 1157: 	 error-stack dup @ dup 1+
 1158: 	 max-errors 1- min error-stack !
 1159: 	 6 * cells + cell+
 1160: 	 5 cells bounds swap DO
 1161: 	                    I !
 1162: 	 -1 cells +LOOP
 1163:   THEN
 1164:   r>
 1165:   r> >in !  r> #tib !  r> >tib !  r> blk !
 1166:   r> loadfile ! r> loadline !  >r ;
 1167: 
 1168: : read-loop ( i*x -- j*x )
 1169:   BEGIN  refill  WHILE  interpret  REPEAT ;
 1170: 
 1171: : include-file ( i*x fid -- j*x )
 1172:   push-file  loadfile !
 1173:   0 loadline ! blk off  ['] read-loop catch
 1174:   loadfile @ close-file swap 2dup or
 1175:   pop-file  drop throw throw ;
 1176: 
 1177: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
 1178: 
 1179: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 )
 1180:     \ opens a file for reading, searching in the path for it; c-addr2
 1181:     \ u2 is the full filename (valid until the next call); if the file
 1182:     \ is not found (or in case of other errors for each try), -38
 1183:     \ (non-existant file) is thrown. Opening for other access modes
 1184:     \ makes little sense, as the path will usually contain dirs that
 1185:     \ are only readable for the user
 1186:     \ !! check for "/", "./", "../" in original filename; check for "~/"?
 1187:     pathdirs 2@ 0
 1188:     ?DO ( c-addr1 u1 dirnamep )
 1189: 	dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
 1190: 	2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
 1191: 	pathfilenamebuf over r> + dup >r r/o open-file 0=
 1192: 	if ( addr u file-id )
 1193: 	    nip nip r> rdrop 0 leave
 1194: 	then
 1195: 	rdrop drop r> cell+ cell+
 1196:     LOOP
 1197:     0<> -&38 and throw ( file-id u2 )
 1198:     pathfilenamebuf swap ;
 1199: 
 1200: : included ( i*x addr u -- j*x )
 1201:     loadfilename 2@ >r >r
 1202:     open-path-file ( file-id c-addr2 u2 )
 1203:     dup allocate throw over loadfilename 2! ( file-id c-addr2 u2 )
 1204:     drop loadfilename 2@ move
 1205:     ['] include-file catch
 1206:     \ don't free filenames; they don't take much space
 1207:     \ and are used for debugging
 1208:     r> r> loadfilename 2!  throw ;
 1209: 
 1210: \ HEX DECIMAL                                           2may93jaw
 1211: 
 1212: : decimal a base ! ;
 1213: : hex     10 base ! ;
 1214: 
 1215: \ DEPTH                                                 9may93jaw
 1216: 
 1217: : depth ( -- +n )  sp@ s0 @ swap - cell / ;
 1218: : clearstack ( ... -- )  s0 @ sp! ;
 1219: 
 1220: \ INCLUDE                                               9may93jaw
 1221: 
 1222: : include  ( "file" -- )
 1223:   name included ;
 1224: 
 1225: \ RECURSE                                               17may93jaw
 1226: 
 1227: : recurse ( -- )
 1228:     lastxt compile, ; immediate restrict
 1229: : recursive ( -- )
 1230:     reveal ; immediate
 1231: 
 1232: \ */MOD */                                              17may93jaw
 1233: 
 1234: \ !! I think */mod should have the same rounding behaviour as / - anton
 1235: : */mod >r m* r> sm/rem ;
 1236: 
 1237: : */ */mod nip ;
 1238: 
 1239: \ EVALUATE                                              17may93jaw
 1240: 
 1241: : evaluate ( c-addr len -- )
 1242:   push-file  dup #tib ! >tib @ swap move
 1243:   >in off blk off loadfile off -1 loadline !
 1244: 
 1245: \  BEGIN  interpret  >in @ #tib @ u>= UNTIL
 1246:   ['] interpret catch
 1247:   pop-file throw ;
 1248: 
 1249: 
 1250: : abort -1 throw ;
 1251: 
 1252: \+ environment? true ENV" CORE"
 1253: \ core wordset is now complete!
 1254: 
 1255: \ Quit                                                 13feb93py
 1256: 
 1257: Defer 'quit
 1258: Defer .status
 1259: : prompt        state @ IF ."  compiled" EXIT THEN ."  ok" ;
 1260: : (quit)        BEGIN .status cr query interpret prompt AGAIN ;
 1261: ' (quit) IS 'quit
 1262: 
 1263: \ DOERROR (DOERROR)                                     13jun93jaw
 1264: 
 1265: 8 Constant max-errors
 1266: Variable error-stack  0 error-stack !
 1267: max-errors 6 * cells allot
 1268: \ format of one cell:
 1269: \ source ( addr u )
 1270: \ >in
 1271: \ line-number
 1272: \ Loadfilename ( addr u )
 1273: 
 1274: : dec. ( n -- )
 1275:     \ print value in decimal representation
 1276:     base @ decimal swap . base ! ;
 1277: 
 1278: : typewhite ( addr u -- )
 1279:     \ like type, but white space is printed instead of the characters
 1280:     bounds ?do
 1281: 	i c@ 9 = if \ check for tab
 1282: 	    9
 1283: 	else
 1284: 	    bl
 1285: 	then
 1286: 	emit
 1287:     loop
 1288: ;
 1289: 
 1290: DEFER DOERROR
 1291: 
 1292: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
 1293:   cr error-stack @
 1294:   IF
 1295:      ." in file included from "
 1296:      type ." :" dec.  drop 2drop
 1297:   ELSE
 1298:      type ." :" dec.
 1299:      cr dup 2over type cr drop
 1300:      nip -trailing 1- ( line-start index2 )
 1301:      0 >r  BEGIN
 1302:                   2dup + c@ bl >  WHILE
 1303: 		  r> 1+ >r  1- dup 0<  UNTIL  THEN  1+
 1304:      ( line-start index1 )
 1305:      typewhite
 1306:      r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
 1307:                   [char] ^ emit
 1308:      loop
 1309:   THEN
 1310: ;
 1311: 
 1312: : (DoError) ( throw-code -- )
 1313:   loadline @ IF
 1314:                source >in @ loadline @ 0 0 .error-frame
 1315:   THEN
 1316:   error-stack @ 0 ?DO
 1317:     -1 error-stack +!
 1318:     error-stack dup @ 6 * cells + cell+
 1319:     6 cells bounds DO
 1320:       I @
 1321:     cell +LOOP
 1322:     .error-frame
 1323:   LOOP
 1324:   dup -2 =
 1325:   IF 
 1326:      "error @ ?dup
 1327:      IF
 1328:         cr count type 
 1329:      THEN
 1330:      drop
 1331:   ELSE
 1332:      .error
 1333:   THEN
 1334:   normal-dp dpp ! ;
 1335: 
 1336: ' (DoError) IS DoError
 1337: 
 1338: : quit   r0 @ rp! handler off >tib @ >r
 1339:   BEGIN
 1340:     postpone [
 1341:     ['] 'quit CATCH dup
 1342:   WHILE
 1343:     DoError r@ >tib !
 1344:   REPEAT
 1345:   drop r> >tib ! ;
 1346: 
 1347: \ Cold                                                 13feb93py
 1348: 
 1349: \ : .name ( name -- ) cell+ count $1F and type space ;
 1350: \ : words  listwords @
 1351: \          BEGIN  @ dup  WHILE  dup .name  REPEAT drop ;
 1352: 
 1353: : cstring>sstring  ( cstring -- addr n )  -1 0 scan 0 swap 1+ /string ;
 1354: : arg ( n -- addr count )  cells argv @ + @ cstring>sstring ;
 1355: : #!       postpone \ ;  immediate
 1356: 
 1357: Create pathstring 2 cells allot \ string
 1358: Create pathdirs   2 cells allot \ dir string array, pointer and count
 1359: Variable argv
 1360: Variable argc
 1361: 
 1362: 0 Value script? ( -- flag )
 1363: 
 1364: : process-path ( addr1 u1 -- addr2 u2 )
 1365:     \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
 1366:     here >r
 1367:     BEGIN
 1368: 	over >r [char] : scan
 1369: 	over r> tuck - ( rest-str this-str )
 1370: 	dup
 1371: 	IF
 1372: 	    2dup 1- chars + c@ [char] / <>
 1373: 	    IF
 1374: 		2dup chars + [char] / swap c!
 1375: 		1+
 1376: 	    THEN
 1377: 	    2,
 1378: 	ELSE
 1379: 	    2drop
 1380: 	THEN
 1381: 	dup
 1382:     WHILE
 1383: 	1 /string
 1384:     REPEAT
 1385:     2drop
 1386:     here r> tuck - 2 cells / ;
 1387: 
 1388: : ">tib  ( addr len -- )  dup #tib ! >in off tib swap move ;
 1389: 
 1390: : do-option ( addr1 len1 addr2 len2 -- n )  2swap
 1391:   2dup s" -e"        compare  0= >r
 1392:   2dup s" -evaluate" compare  0= r> or
 1393:   IF  2drop ">tib interpret  2 EXIT  THEN
 1394:   ." Unknown option: " type cr 2drop 1 ;
 1395: 
 1396: : process-args ( -- )
 1397:     argc @ 1
 1398:     ?DO
 1399: 	I arg over c@ [char] - <>
 1400: 	IF
 1401: 	    true to script? included  false to script? 1
 1402: 	ELSE
 1403: 	    I 1+ arg  do-option
 1404: 	THEN
 1405:     +LOOP ;
 1406: 
 1407: Defer 'cold ' noop IS 'cold
 1408: 
 1409: : cold ( -- )
 1410:     'cold
 1411:     pathstring 2@ process-path pathdirs 2!
 1412:     argc @ 1 >
 1413:     IF
 1414: 	['] process-args catch ?dup
 1415: 	IF
 1416: 	    dup >r DoError cr r> negate (bye)
 1417: 	THEN
 1418:     THEN
 1419:     cr
 1420:     ." GNU Forth 0.0alpha, Copyright (C) 1994 Free Software Foundation, Inc." cr
 1421:     ." GNU Forth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
 1422:     ." Type `bye' to exit"
 1423:     quit ;
 1424: 
 1425: : license ( -- ) cr
 1426:  ." This program is free software; you can redistribute it and/or modify" cr
 1427:  ." it under the terms of the GNU General Public License as published by" cr
 1428:  ." the Free Software Foundation; either version 2 of the License, or" cr
 1429:  ." (at your option) any later version." cr cr
 1430: 
 1431:  ." This program is distributed in the hope that it will be useful," cr
 1432:  ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
 1433:  ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the" cr
 1434:  ." GNU General Public License for more details." cr cr
 1435: 
 1436:  ." You should have received a copy of the GNU General Public License" cr
 1437:  ." along with this program; if not, write to the Free Software" cr
 1438:  ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
 1439: 
 1440: : boot ( path **argv argc -- )
 1441:   argc ! argv ! cstring>sstring pathstring 2!  main-task up!
 1442:   sp@ dup s0 ! $10 + >tib ! rp@ r0 !  fp@ f0 !  cold ;
 1443: 
 1444: : bye  script? 0= IF  cr  THEN  0 (bye) ;
 1445: 
 1446: \ **argv may be scanned by the C starter to get some important
 1447: \ information, as -display and -geometry for an X client FORTH
 1448: \ or space and stackspace overrides
 1449: 
 1450: \ 0 arg contains, however, the name of the program.

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