File:  [gforth] / gforth / Attic / kernal.fs
Revision 1.60: download - view: text, annotated - select for diffs
Tue Jul 16 20:57:11 1996 UTC (24 years, 3 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
SPECIAL: to create special "state-smart" words

    1: \ KERNAL.FS    GForth kernal                        17dec92py
    2: 
    3: \ Copyright (C) 1995 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: \ Idea and implementation: Bernd Paysan (py)
   22: 
   23: \ Log:  ', '- usw. durch [char] ... ersetzt
   24: \       man sollte die unterschiedlichen zahlensysteme
   25: \       mit $ und & zumindest im interpreter weglassen
   26: \       schon erledigt!
   27: \       11may93jaw
   28: \ name>         0= nicht vorhanden              17may93jaw
   29: \               nfa can be lfa or nfa!
   30: \ find          splited into find and (find)
   31: \               (find) for later use            17may93jaw
   32: \ search        replaced by lookup because
   33: \               it is a word of the string wordset
   34: \                                               20may93jaw
   35: \ postpone      added immediate                 21may93jaw
   36: \ to            added immediate                 07jun93jaw
   37: \ cfa, header   put "here lastcfa !" in
   38: \               cfa, this is more logical
   39: \               and noname: works wothout
   40: \               extra "here lastcfa !"          08jun93jaw
   41: \ (parse-white) thrown out
   42: \ refill        added outer trick
   43: \               to show there is something
   44: \               going on                        09jun93jaw
   45: \ leave ?leave  somebody forgot UNLOOP!!!       09jun93jaw
   46: \ leave ?leave  unloop thrown out
   47: \               unloop after loop is used       10jun93jaw
   48: 
   49: HEX
   50: 
   51: \ labels for some code addresses
   52: 
   53: : docon: ( -- addr )	\ gforth
   54:     \ the code address of a @code{CONSTANT}
   55:     ['] bl >code-address ;
   56: 
   57: : docol: ( -- addr )	\ gforth
   58:     \ the code address of a colon definition
   59:     ['] docon: >code-address ;
   60: 
   61: : dovar: ( -- addr )	\ gforth
   62:     \ the code address of a @code{CREATE}d word
   63:     ['] udp >code-address ;
   64: 
   65: : douser: ( -- addr )	\ gforth
   66:     \ the code address of a @code{USER} variable
   67:     ['] s0 >code-address ;
   68: 
   69: : dodefer: ( -- addr )	\ gforth
   70:     \ the code address of a @code{defer}ed word
   71:     ['] source >code-address ;
   72: 
   73: : dofield: ( -- addr )	\ gforth
   74:     \ the code address of a @code{field}
   75:     ['] reveal-method >code-address ;
   76: 
   77: NIL AConstant NIL \ gforth
   78: 
   79: \ Bit string manipulation                              06oct92py
   80: 
   81: \ Create bits  80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
   82: \ DOES> ( n -- )  + c@ ;
   83: 
   84: \ : >bit  ( addr n -- c-addr mask )  8 /mod rot + swap bits ;
   85: \ : +bit  ( addr n -- )  >bit over c@ or swap c! ;
   86: 
   87: \ : relinfo ( -- addr )  forthstart dup @ + !!bug!! ;
   88: \ : >rel  ( addr -- n )  forthstart - ;
   89: \ : relon ( addr -- )  relinfo swap >rel cell / +bit ;
   90: 
   91: \ here allot , c, A,                                   17dec92py
   92: 
   93: : dp	( -- addr ) \ gforth
   94:     dpp @ ;
   95: : here  ( -- here ) \ core
   96:     dp @ ;
   97: : allot ( n -- ) \ core
   98:     dp +! ;
   99: : c,    ( c -- ) \ core
  100:     here 1 chars allot c! ;
  101: : ,     ( x -- ) \ core
  102:     here cell allot  ! ;
  103: : 2,	( w1 w2 -- ) \ gforth
  104:     here 2 cells allot 2! ;
  105: 
  106: \ : aligned ( addr -- addr' ) \ core
  107: \     [ cell 1- ] Literal + [ -1 cells ] Literal and ;
  108: : align ( -- ) \ core
  109:     here dup aligned swap ?DO  bl c,  LOOP ;
  110: 
  111: \ : faligned ( addr -- f-addr ) \ float
  112: \     [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
  113: 
  114: : falign ( -- ) \ float
  115:     here dup faligned swap
  116:     ?DO
  117: 	bl c,
  118:     LOOP ;
  119: 
  120: \ !! this is machine-dependent, but works on all but the strangest machines
  121: ' faligned Alias maxaligned ( addr1 -- addr2 ) \ gforth
  122: ' falign Alias maxalign ( -- ) \ gforth
  123: 
  124: \ !! machine-dependent and won't work if "0 >body" <> "0 >body maxaligned"
  125: ' maxaligned Alias cfaligned ( addr1 -- addr2 ) \ gforth
  126: \ the code field is aligned if its body is maxaligned
  127: ' maxalign Alias cfalign ( -- ) \ gforth
  128: 
  129: : chars ( n1 -- n2 ) \ core
  130: ; immediate
  131: 
  132: 
  133: \ : A!    ( addr1 addr2 -- ) \ gforth
  134: \    dup relon ! ;
  135: \ : A,    ( addr -- ) \ gforth
  136: \    here cell allot A! ;
  137: ' ! alias A! ( addr1 addr2 -- ) \ gforth
  138: ' , alias A, ( addr -- ) \ gforth 
  139: 
  140: 
  141: \ on off                                               23feb93py
  142: 
  143: : on  ( addr -- ) \ gforth
  144:     true  swap ! ;
  145: : off ( addr -- ) \ gforth
  146:     false swap ! ;
  147: 
  148: \ dabs roll                                           17may93jaw
  149: 
  150: : dabs ( d1 -- d2 ) \ double
  151:     dup 0< IF dnegate THEN ;
  152: 
  153: : roll  ( x0 x1 .. xn n -- x1 .. xn x0 ) \ core-ext
  154:   dup 1+ pick >r
  155:   cells sp@ cell+ dup cell+ rot move drop r> ;
  156: 
  157: \ name> found                                          17dec92py
  158: 
  159: $80 constant alias-mask \ set when the word is not an alias!
  160: $40 constant immediate-mask
  161: $20 constant restrict-mask
  162: 
  163: : (name>)  ( nfa+cell -- cfa )
  164:     1 cells - name>string +  cfaligned ;
  165: : name>    ( nfa -- cfa ) \ gforth
  166:     cell+
  167:     dup  (name>) swap  c@ alias-mask and 0= IF  @ THEN ;
  168: 
  169: \ (find)                                               17dec92py
  170: 
  171: \ : (find) ( addr count nfa1 -- nfa2 / false )
  172: \   BEGIN  dup  WHILE  dup >r
  173: \          name>string dup >r 2over r> =
  174: \          IF  -text  0= IF  2drop r> EXIT  THEN
  175: \          ELSE  2drop drop  THEN  r> @
  176: \   REPEAT nip nip ;
  177: 
  178: \ place bounds                                         13feb93py
  179: 
  180: : place  ( addr len to -- ) \ gforth
  181:     over >r  rot over 1+  r> move c! ;
  182: : bounds ( beg count -- end beg ) \ gforth
  183:     over + swap ;
  184: 
  185: \ input stream primitives                              23feb93py
  186: 
  187: : tib ( -- c-addr ) \ core-ext
  188:     \ obsolescent
  189:     >tib @ ;
  190: Defer source ( -- addr count ) \ core
  191: \ used by dodefer:, must be defer
  192: : (source) ( -- addr count )
  193:     tib #tib @ ;
  194: ' (source) IS source
  195: 
  196: \ (word)                                               22feb93py
  197: 
  198: : scan   ( addr1 n1 char -- addr2 n2 ) \ gforth
  199:     \ skip all characters not equal to char
  200:     >r
  201:     BEGIN
  202: 	dup
  203:     WHILE
  204: 	over c@ r@ <>
  205:     WHILE
  206: 	1 /string
  207:     REPEAT  THEN
  208:     rdrop ;
  209: : skip   ( addr1 n1 char -- addr2 n2 ) \ gforth
  210:     \ skip all characters equal to char
  211:     >r
  212:     BEGIN
  213: 	dup
  214:     WHILE
  215: 	over c@ r@  =
  216:     WHILE
  217: 	1 /string
  218:     REPEAT  THEN
  219:     rdrop ;
  220: 
  221: : (word) ( addr1 n1 char -- addr2 n2 )
  222:   dup >r skip 2dup r> scan  nip - ;
  223: 
  224: \ (word) should fold white spaces
  225: \ this is what (parse-white) does
  226: 
  227: \ word parse                                           23feb93py
  228: 
  229: : parse-word  ( char -- addr len ) \ gforth
  230:   source 2dup >r >r >in @ over min /string
  231:   rot dup bl = IF  drop (parse-white)  ELSE  (word)  THEN
  232:   2dup + r> - 1+ r> min >in ! ;
  233: : word   ( char -- addr ) \ core
  234:   parse-word here place  bl here count + c!  here ;
  235: 
  236: : parse    ( char -- addr len ) \ core-ext
  237:   >r  source  >in @ over min /string  over  swap r>  scan >r
  238:   over - dup r> IF 1+ THEN  >in +! ;
  239: 
  240: \ name                                                 13feb93py
  241: 
  242: : capitalize ( addr len -- addr len ) \ gforth
  243:   2dup chars chars bounds
  244:   ?DO  I c@ toupper I c! 1 chars +LOOP ;
  245: : (name) ( -- c-addr count )
  246:     source 2dup >r >r >in @ /string (parse-white)
  247:     2dup + r> - 1+ r> min >in ! ;
  248: \    name count ;
  249: 
  250: : name-too-short? ( c-addr u -- c-addr u )
  251:     dup 0= -&16 and throw ;
  252: 
  253: : name-too-long? ( c-addr u -- c-addr u )
  254:     dup $1F u> -&19 and throw ;
  255: 
  256: \ Literal                                              17dec92py
  257: 
  258: : Literal  ( compilation n -- ; run-time -- n ) \ core
  259:     postpone lit  , ; immediate restrict
  260: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
  261:     postpone lit A, ; immediate restrict
  262: 
  263: : char   ( 'char' -- n ) \ core
  264:     bl word char+ c@ ;
  265: : [char] ( compilation 'char' -- ; run-time -- n )
  266:     char postpone Literal ; immediate restrict
  267: 
  268: : (compile) ( -- ) \ gforth
  269:     r> dup cell+ >r @ compile, ;
  270: : postpone ( "name" -- ) \ core
  271:   name sfind dup 0= abort" Can't compile "
  272:   0> IF  compile,  ELSE  postpone (compile) A,  THEN ; immediate restrict
  273: 
  274: : special: ( interp comp "name" -- )
  275:     Create immediate swap A, A,
  276:     DOES>  state @ IF  cell+  THEN  perform ;
  277: 
  278: \ Use (compile) for the old behavior of compile!
  279: 
  280: \ digit?                                               17dec92py
  281: 
  282: : digit?   ( char -- digit true/ false ) \ gforth
  283:   base @ $100 =
  284:   IF
  285:     true EXIT
  286:   THEN
  287:   toupper [char] 0 - dup 9 u> IF
  288:     [ 'A '9 1 + -  ] literal -
  289:     dup 9 u<= IF
  290:       drop false EXIT
  291:     THEN
  292:   THEN
  293:   dup base @ u>= IF
  294:     drop false EXIT
  295:   THEN
  296:   true ;
  297: 
  298: : accumulate ( +d0 addr digit - +d1 addr )
  299:   swap >r swap  base @  um* drop rot  base @  um* d+ r> ;
  300: 
  301: : >number ( d addr count -- d addr count ) \ core
  302:     0
  303:     ?DO
  304: 	count digit?
  305:     WHILE
  306: 	accumulate
  307:     LOOP
  308:         0
  309:     ELSE
  310: 	1- I' I -
  311: 	UNLOOP
  312:     THEN ;
  313: 
  314: \ number? number                                       23feb93py
  315: 
  316: Create bases   10 ,   2 ,   A , 100 ,
  317: \              16     2    10   Zeichen
  318: \ !! this saving and restoring base is an abomination! - anton
  319: : getbase ( addr u -- addr' u' )
  320:     over c@ [char] $ - dup 4 u<
  321:     IF
  322: 	cells bases + @ base ! 1 /string
  323:     ELSE
  324: 	drop
  325:     THEN ;
  326: : s>number ( addr len -- d )
  327:     base @ >r  dpl on
  328:     over c@ '- =  dup >r
  329:     IF
  330: 	1 /string
  331:     THEN
  332:     getbase  dpl on  0 0 2swap
  333:     BEGIN
  334: 	dup >r >number dup
  335:     WHILE
  336: 	dup r> -
  337:     WHILE
  338: 	dup dpl ! over c@ [char] . =
  339:     WHILE
  340: 	1 /string
  341:     REPEAT  THEN
  342:         2drop rdrop dpl off
  343:     ELSE
  344: 	2drop rdrop r>
  345: 	IF
  346: 	    dnegate
  347: 	THEN
  348:     THEN
  349:     r> base ! ;
  350: 
  351: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
  352:     s>number dpl @ 0=
  353:     IF
  354: 	2drop false  EXIT
  355:     THEN
  356:     dpl @ dup 0> 0= IF
  357: 	nip
  358:     THEN ;
  359: : number? ( string -- string 0 / n -1 / d 0> )
  360:     dup >r count snumber? dup if
  361: 	rdrop
  362:     else
  363: 	r> swap
  364:     then ;
  365: : s>d ( n -- d ) \ core		s-to-d
  366:     dup 0< ;
  367: : number ( string -- d )
  368:     number? ?dup 0= abort" ?"  0<
  369:     IF
  370: 	s>d
  371:     THEN ;
  372: 
  373: \ space spaces ud/mod                                  21mar93py
  374: decimal
  375: Create spaces ( u -- ) \ core
  376: bl 80 times \ times from target compiler! 11may93jaw
  377: DOES>   ( u -- )
  378:     swap
  379:     0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  380: Create backspaces
  381: 08 80 times \ times from target compiler! 11may93jaw
  382: DOES>   ( u -- )
  383:     swap
  384:     0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
  385: hex
  386: : space ( -- ) \ core
  387:     1 spaces ;
  388: 
  389: : ud/mod ( ud1 u2 -- urem udquot ) \ gforth
  390:     >r 0 r@ um/mod r> swap >r
  391:     um/mod r> ;
  392: 
  393: : pad    ( -- addr ) \ core-ext
  394:   here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
  395: 
  396: \ hold <# #> sign # #s                                 25jan92py
  397: 
  398: : hold    ( char -- ) \ core
  399:     pad cell - -1 chars over +! @ c! ;
  400: 
  401: : <# ( -- ) \ core	less-number-sign
  402:     pad cell - dup ! ;
  403: 
  404: : #>      ( xd -- addr u ) \ core	number-sign-greater
  405:     2drop pad cell - dup @ tuck - ;
  406: 
  407: : sign    ( n -- ) \ core
  408:     0< IF  [char] - hold  THEN ;
  409: 
  410: : #       ( ud1 -- ud2 ) \ core		number-sign
  411:     base @ 2 max ud/mod rot 9 over <
  412:     IF
  413: 	[ char A char 9 - 1- ] Literal +
  414:     THEN
  415:     [char] 0 + hold ;
  416: 
  417: : #s      ( +d -- 0 0 ) \ core	number-sign-s
  418:     BEGIN
  419: 	# 2dup d0=
  420:     UNTIL ;
  421: 
  422: \ print numbers                                        07jun92py
  423: 
  424: : d.r ( d n -- ) \ double	d-dot-r
  425:     >r tuck  dabs  <# #s  rot sign #>
  426:     r> over - spaces  type ;
  427: 
  428: : ud.r ( ud n -- ) \ gforth	u-d-dot-r
  429:     >r <# #s #> r> over - spaces type ;
  430: 
  431: : .r ( n1 n2 -- ) \ core-ext	dot-r
  432:     >r s>d r> d.r ;
  433: : u.r ( u n -- )  \ core-ext	u-dot-r
  434:     0 swap ud.r ;
  435: 
  436: : d. ( d -- ) \ double	d-dot
  437:     0 d.r space ;
  438: : ud. ( ud -- ) \ gforth	u-d-dot
  439:     0 ud.r space ;
  440: 
  441: : . ( n -- ) \ core	dot
  442:     s>d d. ;
  443: : u. ( u -- ) \ core	u-dot
  444:     0 ud. ;
  445: 
  446: \ catch throw                                          23feb93py
  447: \ bounce                                                08jun93jaw
  448: 
  449: \ !! allow the user to add rollback actions    anton
  450: \ !! use a separate exception stack?           anton
  451: 
  452: : lp@ ( -- addr ) \ gforth	l-p-fetch
  453:  laddr# [ 0 , ] ;
  454: 
  455: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception
  456:   >r sp@ r> swap >r       \ don't count xt! jaw
  457:   fp@ >r
  458:   lp@ >r
  459:   handler @ >r
  460:   rp@ handler !
  461:   execute
  462:   r> handler ! rdrop rdrop rdrop 0 ;
  463: 
  464: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
  465:     ?DUP IF
  466: 	[ here 9 cells ! ]
  467: 	handler @ rp!
  468: 	r> handler !
  469: 	r> lp!
  470: 	r> fp!
  471: 	r> swap >r sp! r>
  472:     THEN ;
  473: 
  474: \ Bouncing is very fine,
  475: \ programming without wasting time...   jaw
  476: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
  477: \ a throw without data or fp stack restauration
  478:   ?DUP IF
  479:     handler @ rp!
  480:     r> handler !
  481:     r> lp!
  482:     rdrop
  483:     rdrop
  484:   THEN ;
  485: 
  486: \ ?stack                                               23feb93py
  487: 
  488: : ?stack ( ?? -- ?? ) \ gforth
  489:     sp@ s0 @ > IF    -4 throw  THEN
  490:     fp@ f0 @ > IF  -&45 throw  THEN  ;
  491: \ ?stack should be code -- it touches an empty stack!
  492: 
  493: \ interpret                                            10mar92py
  494: 
  495: Defer parser
  496: Defer name ( -- c-addr count ) \ gforth
  497: \ get the next word from the input buffer
  498: ' (name) IS name
  499: Defer compiler-notfound ( c-addr count -- )
  500: Defer interpreter-notfound ( c-addr count -- )
  501: 
  502: : no.extensions  ( addr u -- )
  503:     2drop -&13 bounce ;
  504: ' no.extensions IS compiler-notfound
  505: ' no.extensions IS interpreter-notfound
  506: 
  507: : compile-only ( ... -- )
  508:     -&14 throw ;
  509: Defer interpret-special ( c-addr u xt -- ) \ !! use nfa instead of xt?
  510: ' compile-only IS interpret-special
  511: 
  512: : interpret ( ?? -- ?? ) \ gforth
  513:     \ interpret/compile the (rest of the) input buffer
  514:     BEGIN
  515: 	?stack name dup
  516:     WHILE
  517: 	parser
  518:     REPEAT
  519:     2drop ;
  520: 
  521: \ interpreter compiler                                 30apr92py
  522: 
  523: : interpreter  ( c-addr u -- ) \ gforth
  524:     \ interpretation semantics for the name/number c-addr u
  525:     2dup (sfind) dup
  526:     IF
  527: 	1 and
  528: 	IF \ not restricted to compile state?
  529: 	    nip nip execute EXIT
  530: 	THEN
  531: 	interpret-special exit
  532:     THEN
  533:     drop
  534:     2dup 2>r snumber?
  535:     IF
  536: 	2rdrop
  537:     ELSE
  538: 	2r> interpreter-notfound
  539:     THEN ;
  540: 
  541: ' interpreter  IS  parser
  542: 
  543: : compiler     ( c-addr u -- ) \ gforth
  544:     \ compilation semantics for the name/number c-addr u
  545:     2dup (sfind) dup
  546:     IF
  547: 	0>
  548: 	IF
  549: 	    nip nip execute EXIT
  550: 	THEN
  551: 	compile, 2drop EXIT
  552:     THEN
  553:     drop
  554:     2dup snumber? dup
  555:     IF
  556: 	0>
  557: 	IF
  558: 	    swap postpone Literal
  559: 	THEN
  560: 	postpone Literal
  561: 	2drop
  562:     ELSE
  563: 	drop compiler-notfound
  564:     THEN ;
  565: 
  566: : [ ( -- ) \ core	left-bracket
  567:     ['] interpreter  IS parser state off ; immediate
  568: : ] ( -- ) \ core	right-bracket
  569:     ['] compiler     IS parser state on  ;
  570: 
  571: \ locals stuff needed for control structures
  572: 
  573: : compile-lp+! ( n -- ) \ gforth	compile-l-p-plus-store
  574:     dup negate locals-size +!
  575:     0 over = if
  576:     else -1 cells  over = if postpone lp-
  577:     else  1 floats over = if postpone lp+
  578:     else  2 floats over = if postpone lp+2
  579:     else postpone lp+!# dup ,
  580:     then then then then drop ;
  581: 
  582: : adjust-locals-size ( n -- ) \ gforth
  583:     \ sets locals-size to n and generates an appropriate lp+!
  584:     locals-size @ swap - compile-lp+! ;
  585: 
  586: 
  587: here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs
  588: AConstant locals-list \ acts like a variable that contains
  589: 		      \ a linear list of locals names
  590: 
  591: 
  592: variable dead-code \ true if normal code at "here" would be dead
  593: variable backedge-locals
  594:     \ contains the locals list that BEGIN will assume to be live on
  595:     \ the back edge if the BEGIN is unreachable from above. Set by
  596:     \ ASSUME-LIVE, reset by UNREACHABLE.
  597: 
  598: : UNREACHABLE ( -- ) \ gforth
  599:     \ declares the current point of execution as unreachable
  600:     dead-code on
  601:     0 backedge-locals ! ; immediate
  602: 
  603: : ASSUME-LIVE ( orig -- orig ) \ gforth
  604:     \ used immediateliy before a BEGIN that is not reachable from
  605:     \ above.  causes the BEGIN to assume that the same locals are live
  606:     \ as at the orig point
  607:     dup orig?
  608:     2 pick backedge-locals ! ; immediate
  609:     
  610: \ locals list operations
  611: 
  612: : common-list ( list1 list2 -- list3 ) \ gforth-internal
  613: \ list1 and list2 are lists, where the heads are at higher addresses than
  614: \ the tail. list3 is the largest sublist of both lists.
  615:  begin
  616:    2dup u<>
  617:  while
  618:    2dup u>
  619:    if
  620:      swap
  621:    then
  622:    @
  623:  repeat
  624:  drop ;
  625: 
  626: : sub-list? ( list1 list2 -- f ) \ gforth-internal
  627: \ true iff list1 is a sublist of list2
  628:  begin
  629:    2dup u<
  630:  while
  631:    @
  632:  repeat
  633:  = ;
  634: 
  635: : list-size ( list -- u ) \ gforth-internal
  636: \ size of the locals frame represented by list
  637:  0 ( list n )
  638:  begin
  639:    over 0<>
  640:  while
  641:    over
  642:    name> >body @ max
  643:    swap @ swap ( get next )
  644:  repeat
  645:  faligned nip ;
  646: 
  647: : set-locals-size-list ( list -- )
  648:  dup locals-list !
  649:  list-size locals-size ! ;
  650: 
  651: : check-begin ( list -- )
  652: \ warn if list is not a sublist of locals-list
  653:  locals-list @ sub-list? 0= if
  654:    \ !! print current position
  655:    ." compiler was overly optimistic about locals at a BEGIN" cr
  656:    \ !! print assumption and reality
  657:  then ;
  658: 
  659: \ Control Flow Stack
  660: \ orig, etc. have the following structure:
  661: \ type ( defstart, live-orig, dead-orig, dest, do-dest, scopestart) ( TOS )
  662: \ address (of the branch or the instruction to be branched to) (second)
  663: \ locals-list (valid at address) (third)
  664: 
  665: \ types
  666: 0 constant defstart
  667: 1 constant live-orig
  668: 2 constant dead-orig
  669: 3 constant dest \ the loopback branch is always assumed live
  670: 4 constant do-dest
  671: 5 constant scopestart
  672: 
  673: : def? ( n -- )
  674:     defstart <> abort" unstructured " ;
  675: 
  676: : orig? ( n -- )
  677:  dup live-orig <> swap dead-orig <> and abort" expected orig " ;
  678: 
  679: : dest? ( n -- )
  680:  dest <> abort" expected dest " ;
  681: 
  682: : do-dest? ( n -- )
  683:  do-dest <> abort" expected do-dest " ;
  684: 
  685: : scope? ( n -- )
  686:  scopestart <> abort" expected scope " ;
  687: 
  688: : non-orig? ( n -- )
  689:  dest scopestart 1+ within 0= abort" expected dest, do-dest or scope" ;
  690: 
  691: : cs-item? ( n -- )
  692:  live-orig scopestart 1+ within 0= abort" expected control flow stack item" ;
  693: 
  694: 3 constant cs-item-size
  695: 
  696: : CS-PICK ( ... u -- ... destu ) \ tools-ext
  697:  1+ cs-item-size * 1- >r
  698:  r@ pick  r@ pick  r@ pick
  699:  rdrop
  700:  dup non-orig? ;
  701: 
  702: : CS-ROLL ( destu/origu .. dest0/orig0 u -- .. dest0/orig0 destu/origu ) \ tools-ext
  703:  1+ cs-item-size * 1- >r
  704:  r@ roll r@ roll r@ roll
  705:  rdrop
  706:  dup cs-item? ; 
  707: 
  708: : cs-push-part ( -- list addr )
  709:  locals-list @ here ;
  710: 
  711: : cs-push-orig ( -- orig )
  712:  cs-push-part dead-code @
  713:  if
  714:    dead-orig
  715:  else
  716:    live-orig
  717:  then ;   
  718: 
  719: \ Structural Conditionals                              12dec92py
  720: 
  721: : ?struc      ( flag -- )       abort" unstructured " ;
  722: : sys?        ( sys -- )        dup 0= ?struc ;
  723: : >mark ( -- orig )
  724:  cs-push-orig 0 , ;
  725: : >resolve    ( addr -- )        here over - swap ! ;
  726: : <resolve    ( addr -- )        here - , ;
  727: 
  728: : BUT
  729:     1 cs-roll ;                      immediate restrict
  730: : YET
  731:     0 cs-pick ;                       immediate restrict
  732: 
  733: \ Structural Conditionals                              12dec92py
  734: 
  735: : AHEAD ( compilation -- orig ; run-time -- ) \ tools-ext
  736:     POSTPONE branch  >mark  POSTPONE unreachable ; immediate restrict
  737: 
  738: : IF ( compilation -- orig ; run-time f -- ) \ core
  739:  POSTPONE ?branch >mark ; immediate restrict
  740: 
  741: : ?DUP-IF ( compilation -- orig ; run-time n -- n| ) \ gforth	question-dupe-if
  742: \ This is the preferred alternative to the idiom "?DUP IF", since it can be
  743: \ better handled by tools like stack checkers. Besides, it's faster.
  744:     POSTPONE ?dup-?branch >mark ;       immediate restrict
  745: 
  746: : ?DUP-0=-IF ( compilation -- orig ; run-time n -- n| ) \ gforth	question-dupe-zero-equals-if
  747:     POSTPONE ?dup-0=-?branch >mark ;       immediate restrict
  748: 
  749: : then-like ( orig -- addr )
  750:     swap -rot dead-orig =
  751:     if
  752:         drop
  753:     else
  754:         dead-code @
  755:         if
  756: 	    set-locals-size-list dead-code off
  757: 	else \ both live
  758: 	    dup list-size adjust-locals-size
  759: 	    locals-list @ common-list dup list-size adjust-locals-size
  760: 	    locals-list !
  761: 	then
  762:     then ;
  763: 
  764: : THEN ( compilation orig -- ; run-time -- ) \ core
  765:     dup orig?  then-like  >resolve ; immediate restrict
  766: 
  767: ' THEN alias ENDIF ( compilation orig -- ; run-time -- ) \ gforth
  768: immediate restrict
  769: \ Same as "THEN". This is what you use if your program will be seen by
  770: \ people who have not been brought up with Forth (or who have been
  771: \ brought up with fig-Forth).
  772: 
  773: : ELSE ( compilation orig1 -- orig2 ; run-time f -- ) \ core
  774:     POSTPONE ahead
  775:     1 cs-roll
  776:     POSTPONE then ; immediate restrict
  777: 
  778: 
  779: : BEGIN ( compilation -- dest ; run-time -- ) \ core
  780:     dead-code @ if
  781: 	\ set up an assumption of the locals visible here.  if the
  782: 	\ users want something to be visible, they have to declare
  783: 	\ that using ASSUME-LIVE
  784: 	backedge-locals @ set-locals-size-list
  785:     then
  786:     cs-push-part dest
  787:     dead-code off ; immediate restrict
  788: 
  789: \ AGAIN (the current control flow joins another, earlier one):
  790: \ If the dest-locals-list is not a subset of the current locals-list,
  791: \ issue a warning (see below). The following code is generated:
  792: \ lp+!# (current-local-size - dest-locals-size)
  793: \ branch <begin>
  794: 
  795: : again-like ( dest -- addr )
  796:     over list-size adjust-locals-size
  797:     swap check-begin  POSTPONE unreachable ;
  798: 
  799: : AGAIN ( compilation dest -- ; run-time -- ) \ core-ext
  800:     dest? again-like  POSTPONE branch  <resolve ; immediate restrict
  801: 
  802: \ UNTIL (the current control flow may join an earlier one or continue):
  803: \ Similar to AGAIN. The new locals-list and locals-size are the current
  804: \ ones. The following code is generated:
  805: \ ?branch-lp+!# <begin> (current-local-size - dest-locals-size)
  806: : until-like ( list addr xt1 xt2 -- )
  807:     \ list and addr are a fragment of a cs-item
  808:     \ xt1 is the conditional branch without lp adjustment, xt2 is with
  809:     >r >r
  810:     locals-size @ 2 pick list-size - dup if ( list dest-addr adjustment )
  811: 	r> drop r> compile,
  812: 	swap <resolve ( list adjustment ) ,
  813:     else ( list dest-addr adjustment )
  814: 	drop
  815: 	r> compile, <resolve
  816: 	r> drop
  817:     then ( list )
  818:     check-begin ;
  819: 
  820: : UNTIL ( compilation dest -- ; run-time f -- ) \ core
  821:     dest? ['] ?branch ['] ?branch-lp+!# until-like ; immediate restrict
  822: 
  823: : WHILE ( compilation dest -- orig dest ; run-time f -- ) \ core
  824:     POSTPONE if
  825:     1 cs-roll ; immediate restrict
  826: 
  827: : REPEAT ( compilation orig dest -- ; run-time -- ) \ core
  828:     POSTPONE again
  829:     POSTPONE then ; immediate restrict
  830: 
  831: 
  832: \ counted loops
  833: 
  834: \ leave poses a little problem here
  835: \ we have to store more than just the address of the branch, so the
  836: \ traditional linked list approach is no longer viable.
  837: \ This is solved by storing the information about the leavings in a
  838: \ special stack.
  839: 
  840: \ !! remove the fixed size limit. 'Tis not hard.
  841: 20 constant leave-stack-size
  842: create leave-stack  60 cells allot
  843: Avariable leave-sp  leave-stack 3 cells + leave-sp !
  844: 
  845: : clear-leave-stack ( -- )
  846:     leave-stack leave-sp ! ;
  847: 
  848: \ : leave-empty? ( -- f )
  849: \  leave-sp @ leave-stack = ;
  850: 
  851: : >leave ( orig -- )
  852:     \ push on leave-stack
  853:     leave-sp @
  854:     dup [ leave-stack 60 cells + ] Aliteral
  855:     >= abort" leave-stack full"
  856:     tuck ! cell+
  857:     tuck ! cell+
  858:     tuck ! cell+
  859:     leave-sp ! ;
  860: 
  861: : leave> ( -- orig )
  862:     \ pop from leave-stack
  863:     leave-sp @
  864:     dup leave-stack <= IF
  865:        drop 0 0 0  EXIT  THEN
  866:     cell - dup @ swap
  867:     cell - dup @ swap
  868:     cell - dup @ swap
  869:     leave-sp ! ;
  870: 
  871: : DONE ( compilation orig -- ; run-time -- ) \ gforth
  872:     \ !! the original done had ( addr -- )
  873:     drop >r drop
  874:     begin
  875: 	leave>
  876: 	over r@ u>=
  877:     while
  878: 	POSTPONE then
  879:     repeat
  880:     >leave rdrop ; immediate restrict
  881: 
  882: : LEAVE ( compilation -- ; run-time loop-sys -- ) \ core
  883:     POSTPONE ahead
  884:     >leave ; immediate restrict
  885: 
  886: : ?LEAVE ( compilation -- ; run-time f | f loop-sys -- ) \ gforth	question-leave
  887:     POSTPONE 0= POSTPONE if
  888:     >leave ; immediate restrict
  889: 
  890: : DO ( compilation -- do-sys ; run-time w1 w2 -- loop-sys ) \ core
  891:     POSTPONE (do)
  892:     POSTPONE begin drop do-dest
  893:     ( 0 0 0 >leave ) ; immediate restrict
  894: 
  895: : ?do-like ( -- do-sys )
  896:     ( 0 0 0 >leave )
  897:     >mark >leave
  898:     POSTPONE begin drop do-dest ;
  899: 
  900: : ?DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys )	\ core-ext	question-do
  901:     POSTPONE (?do) ?do-like ; immediate restrict
  902: 
  903: : +DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys )	\ gforth	plus-do
  904:     POSTPONE (+do) ?do-like ; immediate restrict
  905: 
  906: : U+DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys )	\ gforth	u-plus-do
  907:     POSTPONE (u+do) ?do-like ; immediate restrict
  908: 
  909: : -DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys )	\ gforth	minus-do
  910:     POSTPONE (-do) ?do-like ; immediate restrict
  911: 
  912: : U-DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys )	\ gforth	u-minus-do
  913:     POSTPONE (u-do) ?do-like ; immediate restrict
  914: 
  915: : FOR ( compilation -- do-sys ; run-time u -- loop-sys )	\ gforth
  916:     POSTPONE (for)
  917:     POSTPONE begin drop do-dest
  918:     ( 0 0 0 >leave ) ; immediate restrict
  919: 
  920: \ LOOP etc. are just like UNTIL
  921: 
  922: : loop-like ( do-sys xt1 xt2 -- )
  923:     >r >r 0 cs-pick swap cell - swap 1 cs-roll r> r> rot do-dest?
  924:     until-like  POSTPONE done  POSTPONE unloop ;
  925: 
  926: : LOOP ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 )	\ core
  927:  ['] (loop) ['] (loop)-lp+!# loop-like ; immediate restrict
  928: 
  929: : +LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 )	\ core	plus-loop
  930:  ['] (+loop) ['] (+loop)-lp+!# loop-like ; immediate restrict
  931: 
  932: \ !! should the compiler warn about +DO..-LOOP?
  933: : -LOOP ( compilation do-sys -- ; run-time loop-sys1 u -- | loop-sys2 )	\ gforth	minus-loop
  934:  ['] (-loop) ['] (-loop)-lp+!# loop-like ; immediate restrict
  935: 
  936: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP"
  937: \ will iterate as often as "high low ?DO inc S+LOOP". For positive
  938: \ increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for
  939: \ negative increments.
  940: : S+LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 )	\ gforth	s-plus-loop
  941:  ['] (s+loop) ['] (s+loop)-lp+!# loop-like ; immediate restrict
  942: 
  943: : NEXT ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ gforth
  944:  ['] (next) ['] (next)-lp+!# loop-like ; immediate restrict
  945: 
  946: \ Structural Conditionals                              12dec92py
  947: 
  948: : EXIT ( compilation -- ; run-time nest-sys -- ) \ core
  949:     0 adjust-locals-size
  950:     POSTPONE ;s
  951:     POSTPONE unreachable ; immediate restrict
  952: 
  953: : ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth
  954:      POSTPONE if POSTPONE exit POSTPONE then ; immediate restrict
  955: 
  956: \ Strings                                              22feb93py
  957: 
  958: : ," ( "string"<"> -- ) [char] " parse
  959:   here over char+ allot  place align ;
  960: : "lit ( -- addr )
  961:   r> r> dup count + aligned >r swap >r ;               restrict
  962: : (.")     "lit count type ;                           restrict
  963: : (S")     "lit count ;                                restrict
  964: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
  965:     postpone (S") here over char+ allot  place align ;
  966:                                              immediate restrict
  967: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file	paren
  968:     BEGIN
  969: 	>in @ [char] ) parse nip >in @ rot - =
  970:     WHILE
  971: 	loadfile @ IF
  972: 	    refill 0= abort" missing ')' in paren comment"
  973: 	THEN
  974:     REPEAT ;                       immediate
  975: : \ ( -- ) \ core-ext backslash
  976:     blk @
  977:     IF
  978: 	>in @ c/l / 1+ c/l * >in !
  979: 	EXIT
  980:     THEN
  981:     source >in ! drop ; immediate
  982: 
  983: : \G ( -- ) \ gforth backslash
  984:     POSTPONE \ ; immediate
  985: 
  986: \ error handling                                       22feb93py
  987: \ 'abort thrown out!                                   11may93jaw
  988: 
  989: : (abort")
  990:     "lit >r
  991:     IF
  992: 	r> "error ! -2 throw
  993:     THEN
  994:     rdrop ;
  995: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext	abort-quote
  996:     postpone (abort") ," ;        immediate restrict
  997: 
  998: \ Header states                                        23feb93py
  999: 
 1000: : cset ( bmask c-addr -- )
 1001:     tuck c@ or swap c! ; 
 1002: : creset ( bmask c-addr -- )
 1003:     tuck c@ swap invert and swap c! ; 
 1004: : ctoggle ( bmask c-addr -- )
 1005:     tuck c@ xor swap c! ; 
 1006: 
 1007: : lastflags ( -- c-addr )
 1008:     \ the address of the flags byte in the last header
 1009:     \ aborts if the last defined word was headerless
 1010:     last @ dup 0= abort" last word was headerless" cell+ ;
 1011: 
 1012: : immediate     immediate-mask lastflags cset ;
 1013: : restrict      restrict-mask lastflags cset ;
 1014: 
 1015: \ Header                                               23feb93py
 1016: 
 1017: \ input-stream, nextname and noname are quite ugly (passing
 1018: \ information through global variables), but they are useful for dealing
 1019: \ with existing/independent defining words
 1020: 
 1021: defer (header)
 1022: defer header ( -- ) \ gforth
 1023: ' (header) IS header
 1024: 
 1025: : string, ( c-addr u -- ) \ gforth
 1026:     \ puts down string as cstring
 1027:     dup c, here swap chars dup allot move ;
 1028: 
 1029: : header, ( c-addr u -- ) \ gforth
 1030:     name-too-long?
 1031:     align here last !
 1032:     current @ 1 or A,	\ link field; before revealing, it contains the
 1033: 			\ tagged reveal-into wordlist
 1034:     string, cfalign
 1035:     alias-mask lastflags cset ;
 1036: 
 1037: : input-stream-header ( "name" -- )
 1038:     name name-too-short? header, ;
 1039: : input-stream ( -- )  \ general
 1040: \ switches back to getting the name from the input stream ;
 1041:     ['] input-stream-header IS (header) ;
 1042: 
 1043: ' input-stream-header IS (header)
 1044: 
 1045: \ !! make that a 2variable
 1046: create nextname-buffer 32 chars allot
 1047: 
 1048: : nextname-header ( -- )
 1049:     nextname-buffer count header,
 1050:     input-stream ;
 1051: 
 1052: \ the next name is given in the string
 1053: : nextname ( c-addr u -- ) \ gforth
 1054:     name-too-long?
 1055:     nextname-buffer c! ( c-addr )
 1056:     nextname-buffer count move
 1057:     ['] nextname-header IS (header) ;
 1058: 
 1059: : noname-header ( -- )
 1060:     0 last ! cfalign
 1061:     input-stream ;
 1062: 
 1063: : noname ( -- ) \ gforth
 1064: \ the next defined word remains anonymous. The xt of that word is given by lastxt
 1065:     ['] noname-header IS (header) ;
 1066: 
 1067: : lastxt ( -- xt ) \ gforth
 1068: \ 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
 1069:     lastcfa @ ;
 1070: 
 1071: : Alias    ( cfa "name" -- ) \ gforth
 1072:     Header reveal
 1073:     alias-mask lastflags creset
 1074:     dup A, lastcfa ! ;
 1075: 
 1076: : name>string ( nfa -- addr count ) \ gforth	name-to-string
 1077:  cell+ count $1F and ;
 1078: 
 1079: Create ???  0 , 3 c, char ? c, char ? c, char ? c,
 1080: : >name ( cfa -- nfa ) \ gforth	to-name
 1081:  $21 cell do
 1082:    dup i - count $9F and + cfaligned over alias-mask + = if
 1083:      i - cell - unloop exit
 1084:    then
 1085:  cell +loop
 1086:  drop ??? ( wouldn't 0 be better? ) ;
 1087: 
 1088: \ threading                                   17mar93py
 1089: 
 1090: : cfa,     ( code-address -- )  \ gforth	cfa-comma
 1091:     here
 1092:     dup lastcfa !
 1093:     0 A, 0 ,  code-address! ;
 1094: : compile, ( xt -- )	\ core-ext	compile-comma
 1095:     A, ;
 1096: : !does    ( addr -- ) \ gforth	store-does
 1097:     lastxt does-code! ;
 1098: : (does>)  ( R: addr -- )
 1099:     r> /does-handler + !does ;
 1100: : dodoes,  ( -- )
 1101:   here /does-handler allot does-handler! ;
 1102: 
 1103: : Create ( -- ) \ core
 1104:     Header reveal dovar: cfa, ;
 1105: 
 1106: \ Create Variable User Constant                        17mar93py
 1107: 
 1108: : Variable ( -- ) \ core
 1109:     Create 0 , ;
 1110: : AVariable ( -- ) \ gforth
 1111:     Create 0 A, ;
 1112: : 2VARIABLE ( "name" -- ) \ double
 1113:     create 0 , 0 , ;
 1114:     
 1115: : User
 1116:     Variable ;
 1117: : AUser
 1118:     AVariable ;
 1119: 
 1120: : (Constant)  Header reveal docon: cfa, ;
 1121: : Constant ( w -- ) \ core
 1122:     (Constant) , ;
 1123: : AConstant ( addr -- ) \ gforth
 1124:     (Constant) A, ;
 1125: 
 1126: : 2Constant ( d -- ) \ double
 1127:     Create ( w1 w2 "name" -- )
 1128:         2,
 1129:     DOES> ( -- w1 w2 )
 1130:         2@ ;
 1131:     
 1132: \ IS Defer What's Defers TO                            24feb93py
 1133: 
 1134: : Defer ( -- ) \ gforth
 1135:     \ !! shouldn't it be initialized with abort or something similar?
 1136:     Header Reveal dodefer: cfa,
 1137:     ['] noop A, ;
 1138: \     Create ( -- ) 
 1139: \ 	['] noop A,
 1140: \     DOES> ( ??? )
 1141: \ 	perform ;
 1142: 
 1143: : Defers ( "name" -- ) \ gforth
 1144:     ' >body @ compile, ; immediate
 1145: 
 1146: \ : ;                                                  24feb93py
 1147: 
 1148: defer :-hook ( sys1 -- sys2 )
 1149: defer ;-hook ( sys2 -- sys1 )
 1150: 
 1151: : : ( -- colon-sys ) \ core	colon
 1152:     Header docol: cfa, defstart ] :-hook ;
 1153: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core	semicolon
 1154:     ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
 1155: 
 1156: : :noname ( -- xt colon-sys ) \ core-ext	colon-no-name
 1157:     0 last !
 1158:     here docol: cfa, 0 ] :-hook ;
 1159: 
 1160: \ Search list handling                                 23feb93py
 1161: 
 1162: AVariable current ( -- addr ) \ gforth
 1163: 
 1164: : last?   ( -- false / nfa nfa )
 1165:     last @ ?dup ;
 1166: : (reveal) ( nfa wid -- )
 1167:     ( wid>wordlist-id ) dup >r
 1168:     @ over ( name>link ) ! 
 1169:     r> ! ;
 1170: 
 1171: \ object oriented search list                          17mar93py
 1172: 
 1173: \ word list structure:
 1174: 
 1175: struct
 1176:   1 cells: field find-method   \ xt: ( c_addr u wid -- name-id )
 1177:   1 cells: field reveal-method \ xt: ( nfa wid -- ) \ used by dofield:, must be field
 1178:   1 cells: field rehash-method \ xt: ( wid -- )
 1179: \   \ !! what else
 1180: end-struct wordlist-map-struct
 1181: 
 1182: struct
 1183:   1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
 1184:   1 cells: field wordlist-map \ pointer to a wordlist-map-struct
 1185:   1 cells: field wordlist-link \ link field to other wordlists
 1186:   1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
 1187: end-struct wordlist-struct
 1188: 
 1189: : f83find      ( addr len wordlist -- nfa / false )
 1190:     ( wid>wordlist-id ) @ (f83find) ;
 1191: 
 1192: \ Search list table: find reveal
 1193: Create f83search ( -- wordlist-map )
 1194:     ' f83find A,  ' (reveal) A,  ' drop A,
 1195: 
 1196: Create forth-wordlist  NIL A, G f83search T A, NIL A, NIL A,
 1197: AVariable lookup       G forth-wordlist lookup T !
 1198: G forth-wordlist current T !
 1199: 
 1200: \ higher level parts of find
 1201: 
 1202: : special? ( xt -- flag )
 1203:     >does-code ['] S" >does-code = ;
 1204: 
 1205: : xt>i ( xt -- xt )
 1206:     dup special?  IF  >body  @  THEN ;
 1207: 
 1208: : xt>c ( xt -- xt )
 1209:     dup special?  IF  >body  cell+  @  THEN ;
 1210: 
 1211: : xt>s ( xt -- xt )
 1212:     dup special?  IF  >body  state @ IF  cell+  THEN  @  THEN ;
 1213: 
 1214: : found ( nfa -- cfa n ) \ gforth
 1215:     cell+  dup c@ >r  (name>)
 1216:     r@ alias-mask     and  0= IF  @       THEN  -1
 1217:     r@ restrict-mask  and     IF  1-      THEN
 1218:     r> immediate-mask and     IF  negate  THEN  ;
 1219: 
 1220: : (search-wordlist)  ( addr count wid -- nfa / false )
 1221:     dup wordlist-map @ find-method perform ;
 1222: 
 1223: : search-wordlist  ( addr count wid -- 0 / xt +-1 ) \ search
 1224:     (search-wordlist) dup  IF  found  swap xt>s swap  THEN ;
 1225: 
 1226: : (sfind) ( c-addr u -- xt n / 0 )
 1227:     lookup @ (search-wordlist) dup IF  found  THEN ;
 1228: 
 1229: : sfind ( c-addr u -- xt n / 0 ) \ gforth
 1230:     lookup @ search-wordlist ;
 1231: 
 1232: : find   ( addr -- cfa +-1 / string false ) \ core,search
 1233:     dup count sfind dup IF
 1234: 	rot drop
 1235:     THEN
 1236:     dup 1 and 0=  IF  2/  THEN ;
 1237: 
 1238: : (')    ( "name" -- xt ) \ gforth	paren-tick
 1239:     name (sfind) 0= IF  -&13 bounce THEN  ;
 1240: : [(')]  ( compilation "name" -- ; run-time -- addr ) \ gforth	bracket-paren-tick
 1241:     (') postpone ALiteral ; immediate restrict
 1242: 
 1243: : '    ( "name" -- xt ) \ core	tick
 1244:     (') xt>i ;
 1245: : [']  ( compilation "name" -- ; run-time -- addr ) \ core	bracket-tick
 1246:     ' postpone ALiteral ; immediate restrict
 1247: 
 1248: : C'    ( "name" -- xt ) \ gforth	c-tick
 1249:     (') xt>c ;
 1250: : [C']  ( compilation "name" -- ; run-time -- addr ) \ gforth	bracket-c-tick
 1251:     C' postpone ALiteral ; immediate restrict
 1252: 
 1253: : S'    ( "name" -- xt ) \ gforth	s-tick
 1254:     (') xt>s ;
 1255: : [S']  ( compilation "name" -- ; run-time -- addr ) \ gforth	bracket-s-tick
 1256:     S' postpone ALiteral ; immediate restrict
 1257: 
 1258: \ reveal words
 1259: 
 1260: Variable warnings ( -- addr ) \ gforth
 1261: G -1 warnings T !
 1262: 
 1263: : check-shadow  ( addr count wid -- )
 1264: \ prints a warning if the string is already present in the wordlist
 1265:  >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
 1266:    ." redefined " name>string 2dup type
 1267:    compare 0<> if
 1268:      ."  with " type
 1269:    else
 1270:      2drop
 1271:    then
 1272:    space space EXIT
 1273:  then
 1274:  2drop 2drop ;
 1275: 
 1276: : reveal ( -- ) \ gforth
 1277:     last?
 1278:     if \ the last word has a header
 1279: 	dup ( name>link ) @ 1 and
 1280: 	if \ it is still hidden
 1281: 	    dup ( name>link ) @ 1 xor		( nfa wid )
 1282: 	    2dup >r name>string r> check-shadow ( nfa wid )
 1283: 	    dup wordlist-map @ reveal-method perform
 1284: 	then
 1285:     then ;
 1286: 
 1287: : rehash  ( wid -- )
 1288:     dup wordlist-map @ rehash-method perform ;
 1289: 
 1290: \ Input                                                13feb93py
 1291: 
 1292: 07 constant #bell ( -- c ) \ gforth
 1293: 08 constant #bs ( -- c ) \ gforth
 1294: 09 constant #tab ( -- c ) \ gforth
 1295: 7F constant #del ( -- c ) \ gforth
 1296: 0D constant #cr   ( -- c ) \ gforth
 1297: \ the newline key code
 1298: 0C constant #ff ( -- c ) \ gforth
 1299: 0A constant #lf ( -- c ) \ gforth
 1300: 
 1301: : bell  #bell emit ;
 1302: : cr ( -- ) \ core
 1303:     \ emit a newline
 1304:     #lf ( sic! ) emit ;
 1305: 
 1306: \ : backspaces  0 ?DO  #bs emit  LOOP ;
 1307: 
 1308: : (ins) ( max span addr pos1 key -- max span addr pos2 )
 1309:     >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
 1310: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
 1311:     dup IF
 1312: 	#bs emit bl emit #bs emit 1- rot 1- -rot
 1313:     THEN false ;
 1314: : (ret)  true space ;
 1315: 
 1316: Create ctrlkeys
 1317:   ] false false false false  false false false false
 1318:     (bs)  false (ret) false  false (ret) false false
 1319:     false false false false  false false false false
 1320:     false false false false  false false false false [
 1321: 
 1322: defer insert-char
 1323: ' (ins) IS insert-char
 1324: defer everychar
 1325: ' noop IS everychar
 1326: 
 1327: : decode ( max span addr pos1 key -- max span addr pos2 flag )
 1328:   everychar
 1329:   dup #del = IF  drop #bs  THEN  \ del is rubout
 1330:   dup bl <   IF  cells ctrlkeys + perform  EXIT  THEN
 1331:   >r 2over = IF  rdrop bell 0 EXIT  THEN
 1332:   r> insert-char 0 ;
 1333: 
 1334: : accept   ( addr len -- len ) \ core
 1335:   dup 0< IF    abs over dup 1 chars - c@ tuck type 
 1336: \ this allows to edit given strings
 1337:          ELSE  0  THEN rot over
 1338:   BEGIN  key decode  UNTIL
 1339:   2drop nip ;
 1340: 
 1341: \ Output                                               13feb93py
 1342: 
 1343: : (type) ( c-addr u -- ) \ gforth
 1344:     outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
 1345: ;
 1346: 
 1347: Defer type ( c-addr u -- ) \ core
 1348: \ defer type for a output buffer or fast
 1349: \ screen write
 1350: 
 1351: ' (type) IS Type
 1352: 
 1353: : (emit) ( c -- ) \ gforth
 1354:     outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
 1355: ;
 1356: 
 1357: Defer emit ( c -- ) \ core
 1358: ' (Emit) IS Emit
 1359: 
 1360: Defer key ( -- c ) \ core
 1361: ' (key) IS key
 1362: 
 1363: \ Query                                                07apr93py
 1364: 
 1365: : refill ( -- flag ) \ core-ext,block-ext,file-ext
 1366:   blk @  IF  1 blk +!  true  0 >in !  EXIT  THEN
 1367:   tib /line
 1368:   loadfile @ ?dup
 1369:   IF    read-line throw
 1370:   ELSE  sourceline# 0< IF 2drop false EXIT THEN
 1371:         accept true
 1372:   THEN
 1373:   1 loadline +!
 1374:   swap #tib ! 0 >in ! ;
 1375: 
 1376: : Query  ( -- ) \ core-ext
 1377:     \ obsolescent
 1378:     loadfile off  blk off  refill drop ;
 1379: 
 1380: \ File specifiers                                       11jun93jaw
 1381: 
 1382: 
 1383: \ 1 c, here char r c, 0 c,                0 c, 0 c, char b c, 0 c,
 1384: \ 2 c, here char r c, char + c, 0 c,
 1385: \ 2 c, here char w c, char + c, 0 c, align
 1386: 4 Constant w/o ( -- fam ) \ file	w-o
 1387: 2 Constant r/w ( -- fam ) \ file	r-w
 1388: 0 Constant r/o ( -- fam ) \ file	r-o
 1389: 
 1390: \ BIN WRITE-LINE                                        11jun93jaw
 1391: 
 1392: \ : bin           dup 1 chars - c@
 1393: \                 r/o 4 chars + over - dup >r swap move r> ;
 1394: 
 1395: : bin ( fam1 -- fam2 ) \ file
 1396:     1 or ;
 1397: 
 1398: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
 1399:                            \ or not unix environments if
 1400:                            \ bin is not selected
 1401: 
 1402: : write-line ( c-addr u fileid -- ior ) \ file
 1403:     dup >r write-file
 1404:     ?dup IF
 1405: 	r> drop EXIT
 1406:     THEN
 1407:     nl$ count r> write-file ;
 1408: 
 1409: \ include-file                                         07apr93py
 1410: 
 1411: : push-file  ( -- )  r>
 1412:   sourceline# >r  loadfile @ >r
 1413:   blk @ >r  tibstack @ >r  >tib @ >r  #tib @ >r
 1414:   >tib @ tibstack @ = IF  r@ tibstack +!  THEN
 1415:   tibstack @ >tib ! >in @ >r  >r ;
 1416: 
 1417: : pop-file   ( throw-code -- throw-code )
 1418:   dup IF
 1419:          source >in @ sourceline# sourcefilename
 1420: 	 error-stack dup @ dup 1+
 1421: 	 max-errors 1- min error-stack !
 1422: 	 6 * cells + cell+
 1423: 	 5 cells bounds swap DO
 1424: 	                    I !
 1425: 	 -1 cells +LOOP
 1426:   THEN
 1427:   r>
 1428:   r> >in !  r> #tib !  r> >tib !  r> tibstack !  r> blk !
 1429:   r> loadfile ! r> loadline !  >r ;
 1430: 
 1431: : read-loop ( i*x -- j*x )
 1432:   BEGIN  refill  WHILE  interpret  REPEAT ;
 1433: 
 1434: : include-file ( i*x fid -- j*x ) \ file
 1435:   push-file  loadfile !
 1436:   0 loadline ! blk off  ['] read-loop catch
 1437:   loadfile @ close-file swap 2dup or
 1438:   pop-file  drop throw throw ;
 1439: 
 1440: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
 1441: 
 1442: \ : check-file-prefix  ( addr len -- addr' len' flag )
 1443: \   dup 0=                    IF  true EXIT  THEN 
 1444: \   over c@ '/ =              IF  true EXIT  THEN 
 1445: \   over 2 S" ./" compare 0=  IF  true EXIT  THEN 
 1446: \   over 3 S" ../" compare 0= IF  true EXIT  THEN
 1447: \   over 2 S" ~/" compare 0=
 1448: \   IF     1 /string
 1449: \          S" HOME" getenv tuck pathfilenamebuf swap move
 1450: \          2dup + >r pathfilenamebuf + swap move
 1451: \          pathfilenamebuf r> true
 1452: \   ELSE   false
 1453: \   THEN ;
 1454: 
 1455: : absolut-path? ( addr u -- flag ) \ gforth
 1456:     \ a path is absolute, if it starts with a / or a ~ (~ expansion),
 1457:     \ or if it is in the form ./* or ../*, extended regexp: [/~]|./|../
 1458:     \ Pathes simply containing a / are not absolute!
 1459:     over c@ '/ = >r
 1460:     over c@ '~ = >r
 1461:     2dup 2 min S" ./" compare 0= >r
 1462:          3 min S" ../" compare 0=
 1463:     r> r> r> or or or ;
 1464: \   [char] / scan nip 0<> ;    
 1465: 
 1466: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
 1467:     \ opens a file for reading, searching in the path for it (unless
 1468:     \ the filename contains a slash); c-addr2 u2 is the full filename
 1469:     \ (valid until the next call); if the file is not found (or in
 1470:     \ case of other errors for each try), -38 (non-existant file) is
 1471:     \ thrown. Opening for other access modes makes little sense, as
 1472:     \ the path will usually contain dirs that are only readable for
 1473:     \ the user
 1474:     \ !! use file-status to determine access mode?
 1475:     2dup absolut-path?
 1476:     if \ the filename contains a slash
 1477: 	2dup r/o open-file throw ( c-addr1 u1 file-id )
 1478: 	-rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
 1479: 	pathfilenamebuf r> EXIT
 1480:     then
 1481:     pathdirs 2@ 0
 1482: \    check-file-prefix 0= 
 1483: \    IF  pathdirs 2@ 0
 1484:     ?DO ( c-addr1 u1 dirnamep )
 1485: 	dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
 1486: 	2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
 1487: 	pathfilenamebuf over r> + dup >r r/o open-file 0=
 1488: 	IF ( addr u file-id )
 1489: 	    nip nip r> rdrop 0 LEAVE
 1490: 	THEN
 1491: 	rdrop drop r> cell+ cell+
 1492:     LOOP
 1493: \    ELSE   2dup open-file throw -rot  THEN 
 1494:     0<> -&38 and throw ( file-id u2 )
 1495:     pathfilenamebuf swap ;
 1496: 
 1497: create included-files 0 , 0 , ( pointer to and count of included files )
 1498: here ," the terminal" dup c@ swap 1 + swap , A, here 2 cells -
 1499: create image-included-files  1 , A, ( pointer to and count of included files )
 1500: \ included-files points to ALLOCATEd space, while image-included-files
 1501: \ points to ALLOTed objects, so it survives a save-system
 1502: 
 1503: : loadfilename ( -- a-addr )
 1504:     \ a-addr 2@ produces the current file name ( c-addr u )
 1505:     included-files 2@ drop loadfilename# @ 2* cells + ;
 1506: 
 1507: : sourcefilename ( -- c-addr u ) \ gforth
 1508:     \ the name of the source file which is currently the input
 1509:     \ source.  The result is valid only while the file is being
 1510:     \ loaded.  If the current input source is no (stream) file, the
 1511:     \ result is undefined.
 1512:     loadfilename 2@ ;
 1513: 
 1514: : sourceline# ( -- u ) \ gforth		sourceline-number
 1515:     \ the line number of the line that is currently being interpreted
 1516:     \ from a (stream) file. The first line has the number 1. If the
 1517:     \ current input source is no (stream) file, the result is
 1518:     \ undefined.
 1519:     loadline @ ;
 1520: 
 1521: : init-included-files ( -- )
 1522:     image-included-files 2@ 2* cells save-string drop ( addr )
 1523:     image-included-files 2@ nip included-files 2! ;
 1524: 
 1525: : included? ( c-addr u -- f ) \ gforth
 1526:     \ true, iff filename c-addr u is in included-files
 1527:     included-files 2@ 0
 1528:     ?do ( c-addr u addr )
 1529: 	dup >r 2@ 2over compare 0=
 1530: 	if
 1531: 	    2drop rdrop unloop
 1532: 	    true EXIT
 1533: 	then
 1534: 	r> cell+ cell+
 1535:     loop
 1536:     2drop drop false ;
 1537: 
 1538: : add-included-file ( c-addr u -- ) \ gforth
 1539:     \ add name c-addr u to included-files
 1540:     included-files 2@ tuck 1+ 2* cells resize throw
 1541:     swap 2dup 1+ included-files 2!
 1542:     2* cells + 2! ;
 1543: 
 1544: : save-string		( addr1 u -- addr2 u ) \ gforth
 1545:     \ !! not a string, but a memblock word
 1546:     swap >r
 1547:     dup allocate throw
 1548:     swap 2dup r> -rot move ;
 1549: 
 1550: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
 1551:     \ include the file file-id with the name given by c-addr u
 1552:     loadfilename# @ >r
 1553:     save-string add-included-file ( file-id )
 1554:     included-files 2@ nip 1- loadfilename# !
 1555:     ['] include-file catch
 1556:     r> loadfilename# !
 1557:     throw ;
 1558:     
 1559: : included ( i*x addr u -- j*x ) \ file
 1560:     open-path-file included1 ;
 1561: 
 1562: : required ( i*x addr u -- j*x ) \ gforth
 1563:     \ include the file with the name given by addr u, if it is not
 1564:     \ included already. Currently this works by comparing the name of
 1565:     \ the file (with path) against the names of earlier included
 1566:     \ files; however, it would probably be better to fstat the file,
 1567:     \ and compare the device and inode. The advantages would be: no
 1568:     \ problems with several paths to the same file (e.g., due to
 1569:     \ links) and we would catch files included with include-file and
 1570:     \ write a require-file.
 1571:     open-path-file 2dup included?
 1572:     if
 1573: 	2drop close-file throw
 1574:     else
 1575: 	included1
 1576:     then ;
 1577: 
 1578: \ HEX DECIMAL                                           2may93jaw
 1579: 
 1580: : decimal ( -- ) \ core
 1581:     a base ! ;
 1582: : hex ( -- ) \ core-ext
 1583:     10 base ! ;
 1584: 
 1585: \ DEPTH                                                 9may93jaw
 1586: 
 1587: : depth ( -- +n ) \ core
 1588:     sp@ s0 @ swap - cell / ;
 1589: : clearstack ( ... -- )
 1590:     s0 @ sp! ;
 1591: 
 1592: \ INCLUDE                                               9may93jaw
 1593: 
 1594: : include  ( "file" -- ) \ gforth
 1595:   name included ;
 1596: 
 1597: : require  ( "file" -- ) \ gforth
 1598:   name required ;
 1599: 
 1600: \ RECURSE                                               17may93jaw
 1601: 
 1602: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
 1603:     lastxt compile, ; immediate restrict
 1604: ' reveal alias recursive ( -- ) \ gforth
 1605: 	immediate
 1606: 
 1607: \ */MOD */                                              17may93jaw
 1608: 
 1609: \ !! I think */mod should have the same rounding behaviour as / - anton
 1610: : */mod ( n1 n2 n3 -- n4 n5 ) \ core	star-slash-mod
 1611:     >r m* r> sm/rem ;
 1612: 
 1613: : */ ( n1 n2 n3 -- n4 ) \ core	star-slash
 1614:     */mod nip ;
 1615: 
 1616: \ EVALUATE                                              17may93jaw
 1617: 
 1618: : evaluate ( c-addr len -- ) \ core,block
 1619:   push-file  #tib ! >tib !
 1620:   >in off blk off loadfile off -1 loadline !
 1621:   ['] interpret catch
 1622:   pop-file throw ;
 1623: 
 1624: : abort ( ?? -- ?? ) \ core,exception-ext
 1625:     -1 throw ;
 1626: 
 1627: \+ environment? true ENV" CORE"
 1628: \ core wordset is now complete!
 1629: 
 1630: \ Quit                                                 13feb93py
 1631: 
 1632: Defer 'quit
 1633: Defer .status
 1634: : prompt        state @ IF ."  compiled" EXIT THEN ."  ok" ;
 1635: : (quit)        BEGIN .status cr query interpret prompt AGAIN ;
 1636: ' (quit) IS 'quit
 1637: 
 1638: \ DOERROR (DOERROR)                                     13jun93jaw
 1639: 
 1640: 8 Constant max-errors
 1641: Variable error-stack  0 error-stack !
 1642: max-errors 6 * cells allot
 1643: \ format of one cell:
 1644: \ source ( addr u )
 1645: \ >in
 1646: \ line-number
 1647: \ Loadfilename ( addr u )
 1648: 
 1649: : dec. ( n -- ) \ gforth
 1650:     \ print value in decimal representation
 1651:     base @ decimal swap . base ! ;
 1652: 
 1653: : typewhite ( addr u -- ) \ gforth
 1654:     \ like type, but white space is printed instead of the characters
 1655:     bounds ?do
 1656: 	i c@ 9 = if \ check for tab
 1657: 	    9
 1658: 	else
 1659: 	    bl
 1660: 	then
 1661: 	emit
 1662:     loop ;
 1663: 
 1664: DEFER DOERROR
 1665: 
 1666: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
 1667:   cr error-stack @
 1668:   IF
 1669:      ." in file included from "
 1670:      type ." :" dec.  drop 2drop
 1671:   ELSE
 1672:      type ." :" dec.
 1673:      cr dup 2over type cr drop
 1674:      nip -trailing 1- ( line-start index2 )
 1675:      0 >r  BEGIN
 1676:                   2dup + c@ bl >  WHILE
 1677: 		  r> 1+ >r  1- dup 0<  UNTIL  THEN  1+
 1678:      ( line-start index1 )
 1679:      typewhite
 1680:      r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
 1681:                   [char] ^ emit
 1682:      loop
 1683:   THEN
 1684: ;
 1685: 
 1686: : (DoError) ( throw-code -- )
 1687:   sourceline# IF
 1688:                source >in @ sourceline# 0 0 .error-frame
 1689:   THEN
 1690:   error-stack @ 0 ?DO
 1691:     -1 error-stack +!
 1692:     error-stack dup @ 6 * cells + cell+
 1693:     6 cells bounds DO
 1694:       I @
 1695:     cell +LOOP
 1696:     .error-frame
 1697:   LOOP
 1698:   dup -2 =
 1699:   IF 
 1700:      "error @ ?dup
 1701:      IF
 1702:         cr count type 
 1703:      THEN
 1704:      drop
 1705:   ELSE
 1706:      .error
 1707:   THEN
 1708:   normal-dp dpp ! ;
 1709: 
 1710: ' (DoError) IS DoError
 1711: 
 1712: : quit ( ?? -- ?? ) \ core
 1713:     r0 @ rp! handler off >tib @ >r
 1714:     BEGIN
 1715: 	postpone [
 1716: 	['] 'quit CATCH dup
 1717:     WHILE
 1718: 	DoError r@ >tib ! r@ tibstack !
 1719:     REPEAT
 1720:     drop r> >tib ! ;
 1721: 
 1722: \ Cold                                                 13feb93py
 1723: 
 1724: \ : .name ( name -- ) name>string type space ;
 1725: \ : words  listwords @
 1726: \          BEGIN  @ dup  WHILE  dup .name  REPEAT drop ;
 1727: 
 1728: : cstring>sstring  ( cstring -- addr n ) \ gforth	cstring-to-sstring
 1729:     -1 0 scan 0 swap 1+ /string ;
 1730: : arg ( n -- addr count ) \ gforth
 1731:     cells argv @ + @ cstring>sstring ;
 1732: : #!       postpone \ ;  immediate
 1733: 
 1734: Create pathstring 2 cells allot \ string
 1735: Create pathdirs   2 cells allot \ dir string array, pointer and count
 1736: Variable argv
 1737: Variable argc
 1738: 
 1739: 0 Value script? ( -- flag )
 1740: 
 1741: : process-path ( addr1 u1 -- addr2 u2 )
 1742:     \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
 1743:     align here >r
 1744:     BEGIN
 1745: 	over >r [char] : scan
 1746: 	over r> tuck - ( rest-str this-str )
 1747: 	dup
 1748: 	IF
 1749: 	    2dup 1- chars + c@ [char] / <>
 1750: 	    IF
 1751: 		2dup chars + [char] / swap c!
 1752: 		1+
 1753: 	    THEN
 1754: 	    2,
 1755: 	ELSE
 1756: 	    2drop
 1757: 	THEN
 1758: 	dup
 1759:     WHILE
 1760: 	1 /string
 1761:     REPEAT
 1762:     2drop
 1763:     here r> tuck - 2 cells / ;
 1764: 
 1765: : do-option ( addr1 len1 addr2 len2 -- n )
 1766:     2swap
 1767:     2dup s" -e"         compare  0= >r
 1768:     2dup s" --evaluate" compare  0= r> or
 1769:     IF  2drop dup >r ['] evaluate catch
 1770: 	?dup IF  dup >r DoError r> negate (bye)  THEN
 1771: 	r> >tib +!  2 EXIT  THEN
 1772:     ." Unknown option: " type cr 2drop 1 ;
 1773: 
 1774: : process-args ( -- )
 1775:     >tib @ >r
 1776:     argc @ 1
 1777:     ?DO
 1778: 	I arg over c@ [char] - <>
 1779: 	IF
 1780: 	    required 1
 1781: 	ELSE
 1782: 	    I 1+ argc @ =  IF  s" "  ELSE  I 1+ arg  THEN
 1783: 	    do-option
 1784: 	THEN
 1785:     +LOOP
 1786:     r> >tib ! ;
 1787: 
 1788: Defer 'cold ' noop IS 'cold
 1789: 
 1790: : cold ( -- ) \ gforth
 1791:     stdout TO outfile-id
 1792:     pathstring 2@ process-path pathdirs 2!
 1793:     init-included-files
 1794:     'cold
 1795:     argc @ 1 >
 1796:     IF
 1797: 	true to script?
 1798: 	['] process-args catch ?dup
 1799: 	IF
 1800: 	    dup >r DoError cr r> negate (bye)
 1801: 	THEN
 1802: 	cr
 1803:     THEN
 1804:     false to script?
 1805:     ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
 1806:     ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
 1807:     ." Type `bye' to exit"
 1808:     loadline off quit ;
 1809: 
 1810: : license ( -- ) \ gforth
 1811:  cr
 1812:  ." This program is free software; you can redistribute it and/or modify" cr
 1813:  ." it under the terms of the GNU General Public License as published by" cr
 1814:  ." the Free Software Foundation; either version 2 of the License, or" cr
 1815:  ." (at your option) any later version." cr cr
 1816: 
 1817:  ." This program is distributed in the hope that it will be useful," cr
 1818:  ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
 1819:  ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the" cr
 1820:  ." GNU General Public License for more details." cr cr
 1821: 
 1822:  ." You should have received a copy of the GNU General Public License" cr
 1823:  ." along with this program; if not, write to the Free Software" cr
 1824:  ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
 1825: 
 1826: : boot ( path **argv argc -- )
 1827:   argc ! argv ! cstring>sstring pathstring 2!  main-task up!
 1828:   sp@ dup s0 ! $10 + dup >tib ! tibstack ! #tib off >in off
 1829:   rp@ r0 !  fp@ f0 !  ['] cold catch DoError bye ;
 1830: 
 1831: : bye ( -- ) \ tools-ext
 1832:     script? 0= IF  cr  THEN  0 (bye) ;
 1833: 
 1834: \ **argv may be scanned by the C starter to get some important
 1835: \ information, as -display and -geometry for an X client FORTH
 1836: \ or space and stackspace overrides
 1837: 
 1838: \ 0 arg contains, however, the name of the program.
 1839: 
 1840: 

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