1: \ kernel.fs GForth kernel 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: HEX
24:
25: \ labels for some code addresses
26:
27: : docon: ( -- addr ) \ gforth
28: \G the code address of a @code{CONSTANT}
29: ['] bl >code-address ;
30:
31: : docol: ( -- addr ) \ gforth
32: \G the code address of a colon definition
33: ['] docon: >code-address ;
34:
35: : dovar: ( -- addr ) \ gforth
36: \G the code address of a @code{CREATE}d word
37: ['] udp >code-address ;
38:
39: : douser: ( -- addr ) \ gforth
40: \G the code address of a @code{USER} variable
41: ['] s0 >code-address ;
42:
43: : dodefer: ( -- addr ) \ gforth
44: \G the code address of a @code{defer}ed word
45: ['] source >code-address ;
46:
47: : dofield: ( -- addr ) \ gforth
48: \G the code address of a @code{field}
49: ['] reveal-method >code-address ;
50:
51: NIL AConstant NIL \ gforth
52:
53: \ Bit string manipulation 06oct92py
54:
55: \ Create bits 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
56: \ DOES> ( n -- ) + c@ ;
57:
58: \ : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
59: \ : +bit ( addr n -- ) >bit over c@ or swap c! ;
60:
61: \ : relinfo ( -- addr ) forthstart dup @ + !!bug!! ;
62: \ : >rel ( addr -- n ) forthstart - ;
63: \ : relon ( addr -- ) relinfo swap >rel cell / +bit ;
64:
65: \ here allot , c, A, 17dec92py
66:
67: : dp ( -- addr ) \ gforth
68: dpp @ ;
69: : here ( -- here ) \ core
70: dp @ ;
71: : allot ( n -- ) \ core
72: dp +! ;
73: : c, ( c -- ) \ core
74: here 1 chars allot c! ;
75: : , ( x -- ) \ core
76: here cell allot ! ;
77: : 2, ( w1 w2 -- ) \ gforth
78: here 2 cells allot 2! ;
79:
80: \ : aligned ( addr -- addr' ) \ core
81: \ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
82: : align ( -- ) \ core
83: here dup aligned swap ?DO bl c, LOOP ;
84:
85: \ : faligned ( addr -- f-addr ) \ float
86: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
87:
88: : falign ( -- ) \ float
89: here dup faligned swap
90: ?DO
91: bl c,
92: LOOP ;
93:
94: \ !! this is machine-dependent, but works on all but the strangest machines
95: ' faligned Alias maxaligned ( addr1 -- addr2 ) \ gforth
96: ' falign Alias maxalign ( -- ) \ gforth
97:
98: \ !! machine-dependent and won't work if "0 >body" <> "0 >body maxaligned"
99: ' maxaligned Alias cfaligned ( addr1 -- addr2 ) \ gforth
100: \ the code field is aligned if its body is maxaligned
101: ' maxalign Alias cfalign ( -- ) \ gforth
102:
103: : chars ( n1 -- n2 ) \ core
104: ; immediate
105:
106:
107: \ : A! ( addr1 addr2 -- ) \ gforth
108: \ dup relon ! ;
109: \ : A, ( addr -- ) \ gforth
110: \ here cell allot A! ;
111: ' ! alias A! ( addr1 addr2 -- ) \ gforth
112: ' , alias A, ( addr -- ) \ gforth
113:
114:
115: \ on off 23feb93py
116:
117: : on ( addr -- ) \ gforth
118: true swap ! ;
119: : off ( addr -- ) \ gforth
120: false swap ! ;
121:
122: \ dabs roll 17may93jaw
123:
124: : dabs ( d1 -- d2 ) \ double
125: dup 0< IF dnegate THEN ;
126:
127: : roll ( x0 x1 .. xn n -- x1 .. xn x0 ) \ core-ext
128: dup 1+ pick >r
129: cells sp@ cell+ dup cell+ rot move drop r> ;
130:
131: \ name> found 17dec92py
132:
133: $80 constant alias-mask \ set when the word is not an alias!
134: $40 constant immediate-mask
135: $20 constant restrict-mask
136:
137: : ((name>)) ( nfa -- cfa )
138: name>string + cfaligned ;
139:
140: : (name>x) ( nfa -- cfa b )
141: \ cfa is an intermediate cfa and b is the flags byte of nfa
142: dup ((name>))
143: swap cell+ c@ dup alias-mask and 0=
144: IF
145: swap @ swap
146: THEN ;
147:
148: \ place bounds 13feb93py
149:
150: : place ( addr len to -- ) \ gforth
151: over >r rot over 1+ r> move c! ;
152: : bounds ( beg count -- end beg ) \ gforth
153: over + swap ;
154:
155: : save-mem ( addr1 u -- addr2 u ) \ gforth
156: \g copy a memory block into a newly allocated region in the heap
157: swap >r
158: dup allocate throw
159: swap 2dup r> -rot move ;
160:
161: : extend-mem ( addr1 u1 u -- addr addr2 u2 )
162: \ extend memory block allocated from the heap by u aus
163: \ the (possibly reallocated piece is addr2 u2, the extension is at addr
164: over >r + dup >r resize throw
165: r> over r> + -rot ;
166:
167: \ input stream primitives 23feb93py
168:
169: : tib ( -- c-addr ) \ core-ext
170: \ obsolescent
171: >tib @ ;
172: Defer source ( -- addr count ) \ core
173: \ used by dodefer:, must be defer
174: : (source) ( -- addr count )
175: tib #tib @ ;
176: ' (source) IS source
177:
178: \ (word) 22feb93py
179:
180: : scan ( addr1 n1 char -- addr2 n2 ) \ gforth
181: \ skip all characters not equal to char
182: >r
183: BEGIN
184: dup
185: WHILE
186: over c@ r@ <>
187: WHILE
188: 1 /string
189: REPEAT THEN
190: rdrop ;
191: : skip ( addr1 n1 char -- addr2 n2 ) \ gforth
192: \ skip all characters equal to char
193: >r
194: BEGIN
195: dup
196: WHILE
197: over c@ r@ =
198: WHILE
199: 1 /string
200: REPEAT THEN
201: rdrop ;
202:
203: : (word) ( addr1 n1 char -- addr2 n2 )
204: dup >r skip 2dup r> scan nip - ;
205:
206: \ (word) should fold white spaces
207: \ this is what (parse-white) does
208:
209: \ word parse 23feb93py
210:
211: : parse-word ( char -- addr len ) \ gforth
212: source 2dup >r >r >in @ over min /string
213: rot dup bl = IF drop (parse-white) ELSE (word) THEN
214: 2dup + r> - 1+ r> min >in ! ;
215: : word ( char -- addr ) \ core
216: parse-word here place bl here count + c! here ;
217:
218: : parse ( char -- addr len ) \ core-ext
219: >r source >in @ over min /string over swap r> scan >r
220: over - dup r> IF 1+ THEN >in +! ;
221:
222: \ name 13feb93py
223:
224: : capitalize ( addr len -- addr len ) \ gforth
225: 2dup chars chars bounds
226: ?DO I c@ toupper I c! 1 chars +LOOP ;
227: : (name) ( -- c-addr count )
228: source 2dup >r >r >in @ /string (parse-white)
229: 2dup + r> - 1+ r> min >in ! ;
230: \ name count ;
231:
232: : name-too-short? ( c-addr u -- c-addr u )
233: dup 0= -&16 and throw ;
234:
235: : name-too-long? ( c-addr u -- c-addr u )
236: dup $1F u> -&19 and throw ;
237:
238: \ Literal 17dec92py
239:
240: : Literal ( compilation n -- ; run-time -- n ) \ core
241: postpone lit , ; immediate restrict
242: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
243: postpone lit A, ; immediate restrict
244:
245: : char ( 'char' -- n ) \ core
246: bl word char+ c@ ;
247: : [char] ( compilation 'char' -- ; run-time -- n )
248: char postpone Literal ; immediate restrict
249:
250: : (compile) ( -- ) \ gforth
251: r> dup cell+ >r @ compile, ;
252:
253: : postpone, ( w xt -- )
254: \g Compiles the compilation semantics represented by @var{w xt}.
255: dup ['] execute =
256: if
257: drop compile,
258: else
259: dup ['] compile, =
260: if
261: drop POSTPONE (compile) compile,
262: else
263: swap POSTPONE aliteral compile,
264: then
265: then ;
266:
267: : POSTPONE ( "name" -- ) \ core
268: \g Compiles the compilation semantics of @var{name}.
269: COMP' postpone, ; immediate restrict
270:
271: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
272: Create immediate swap A, A,
273: DOES>
274: abort" executed primary cfa of an interpret/compile: word" ;
275: \ state @ IF cell+ THEN perform ;
276:
277: \ Use (compile) for the old behavior of compile!
278:
279: \ digit? 17dec92py
280:
281: : digit? ( char -- digit true/ false ) \ gforth
282: base @ $100 =
283: IF
284: true EXIT
285: THEN
286: toupper [char] 0 - dup 9 u> IF
287: [ 'A '9 1 + - ] literal -
288: dup 9 u<= IF
289: drop false EXIT
290: THEN
291: THEN
292: dup base @ u>= IF
293: drop false EXIT
294: THEN
295: true ;
296:
297: : accumulate ( +d0 addr digit - +d1 addr )
298: swap >r swap base @ um* drop rot base @ um* d+ r> ;
299:
300: : >number ( d addr count -- d addr count ) \ core
301: 0
302: ?DO
303: count digit?
304: WHILE
305: accumulate
306: LOOP
307: 0
308: ELSE
309: 1- I' I -
310: UNLOOP
311: THEN ;
312:
313: \ number? number 23feb93py
314:
315: Create bases 10 , 2 , A , 100 ,
316: \ 16 2 10 character
317: \ !! this saving and restoring base is an abomination! - anton
318: : getbase ( addr u -- addr' u' )
319: over c@ [char] $ - dup 4 u<
320: IF
321: cells bases + @ base ! 1 /string
322: ELSE
323: drop
324: THEN ;
325: : s>number ( addr len -- d )
326: base @ >r dpl on
327: over c@ '- = dup >r
328: IF
329: 1 /string
330: THEN
331: getbase dpl on 0 0 2swap
332: BEGIN
333: dup >r >number dup
334: WHILE
335: dup r> -
336: WHILE
337: dup dpl ! over c@ [char] . =
338: WHILE
339: 1 /string
340: REPEAT THEN
341: 2drop rdrop dpl off
342: ELSE
343: 2drop rdrop r>
344: IF
345: dnegate
346: THEN
347: THEN
348: r> base ! ;
349:
350: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
351: s>number dpl @ 0=
352: IF
353: 2drop false EXIT
354: THEN
355: dpl @ dup 0> 0= IF
356: nip
357: THEN ;
358: : number? ( string -- string 0 / n -1 / d 0> )
359: dup >r count snumber? dup if
360: rdrop
361: else
362: r> swap
363: then ;
364: : s>d ( n -- d ) \ core s-to-d
365: dup 0< ;
366: : number ( string -- d )
367: number? ?dup 0= abort" ?" 0<
368: IF
369: s>d
370: THEN ;
371:
372: \ space spaces ud/mod 21mar93py
373: decimal
374: Create spaces ( u -- ) \ core
375: bl 80 times \ times from target compiler! 11may93jaw
376: DOES> ( u -- )
377: swap
378: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
379: Create backspaces
380: 08 80 times \ times from target compiler! 11may93jaw
381: DOES> ( u -- )
382: swap
383: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
384: hex
385: : space ( -- ) \ core
386: 1 spaces ;
387:
388: : ud/mod ( ud1 u2 -- urem udquot ) \ gforth
389: >r 0 r@ um/mod r> swap >r
390: um/mod r> ;
391:
392: : pad ( -- addr ) \ core-ext
393: here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
394:
395: \ hold <# #> sign # #s 25jan92py
396:
397: : hold ( char -- ) \ core
398: pad cell - -1 chars over +! @ c! ;
399:
400: : <# ( -- ) \ core less-number-sign
401: pad cell - dup ! ;
402:
403: : #> ( xd -- addr u ) \ core number-sign-greater
404: 2drop pad cell - dup @ tuck - ;
405:
406: : sign ( n -- ) \ core
407: 0< IF [char] - hold THEN ;
408:
409: : # ( ud1 -- ud2 ) \ core number-sign
410: base @ 2 max ud/mod rot 9 over <
411: IF
412: [ char A char 9 - 1- ] Literal +
413: THEN
414: [char] 0 + hold ;
415:
416: : #s ( +d -- 0 0 ) \ core number-sign-s
417: BEGIN
418: # 2dup d0=
419: UNTIL ;
420:
421: \ print numbers 07jun92py
422:
423: : d.r ( d n -- ) \ double d-dot-r
424: >r tuck dabs <# #s rot sign #>
425: r> over - spaces type ;
426:
427: : ud.r ( ud n -- ) \ gforth u-d-dot-r
428: >r <# #s #> r> over - spaces type ;
429:
430: : .r ( n1 n2 -- ) \ core-ext dot-r
431: >r s>d r> d.r ;
432: : u.r ( u n -- ) \ core-ext u-dot-r
433: 0 swap ud.r ;
434:
435: : d. ( d -- ) \ double d-dot
436: 0 d.r space ;
437: : ud. ( ud -- ) \ gforth u-d-dot
438: 0 ud.r space ;
439:
440: : . ( n -- ) \ core dot
441: s>d d. ;
442: : u. ( u -- ) \ core u-dot
443: 0 ud. ;
444:
445: \ catch throw 23feb93py
446: \ bounce 08jun93jaw
447:
448: \ !! allow the user to add rollback actions anton
449: \ !! use a separate exception stack? anton
450:
451: : lp@ ( -- addr ) \ gforth l-p-fetch
452: laddr# [ 0 , ] ;
453:
454: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception
455: sp@ >r
456: fp@ >r
457: lp@ >r
458: handler @ >r
459: rp@ handler !
460: execute
461: r> handler ! rdrop rdrop rdrop 0 ;
462:
463: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
464: ?DUP IF
465: [ here 9 cells ! ] \ entry point for signal handler
466: handler @ dup 0= IF
467: 2 (bye)
468: THEN
469: rp!
470: r> handler !
471: r> lp!
472: r> fp!
473: r> swap >r sp! drop r>
474: THEN ;
475:
476: \ Bouncing is very fine,
477: \ programming without wasting time... jaw
478: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
479: \ a throw without data or fp stack restauration
480: ?DUP IF
481: handler @ rp!
482: r> handler !
483: r> lp!
484: rdrop
485: rdrop
486: THEN ;
487:
488: \ ?stack 23feb93py
489:
490: : ?stack ( ?? -- ?? ) \ gforth
491: sp@ s0 @ u> IF -4 throw THEN
492: fp@ f0 @ u> IF -&45 throw THEN ;
493: \ ?stack should be code -- it touches an empty stack!
494:
495: \ interpret 10mar92py
496:
497: Defer parser
498: Defer name ( -- c-addr count ) \ gforth
499: \ get the next word from the input buffer
500: ' (name) IS name
501: Defer compiler-notfound ( c-addr count -- )
502: Defer interpreter-notfound ( c-addr count -- )
503:
504: : no.extensions ( addr u -- )
505: 2drop -&13 bounce ;
506: ' no.extensions IS compiler-notfound
507: ' no.extensions IS interpreter-notfound
508:
509: : compile-only-error ( ... -- )
510: -&14 throw ;
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: \ not the most efficient implementations of interpreter and compiler
524: : interpreter ( c-addr u -- )
525: 2dup find-name dup
526: if
527: nip nip name>int execute
528: else
529: drop
530: 2dup 2>r snumber?
531: IF
532: 2rdrop
533: ELSE
534: 2r> interpreter-notfound
535: THEN
536: then ;
537:
538: : compiler ( c-addr u -- )
539: 2dup find-name dup
540: if ( c-addr u nt )
541: nip nip name>comp execute
542: else
543: drop
544: 2dup snumber? dup
545: IF
546: 0>
547: IF
548: swap postpone Literal
549: THEN
550: postpone Literal
551: 2drop
552: ELSE
553: drop compiler-notfound
554: THEN
555: then ;
556:
557: ' interpreter IS parser
558:
559: : [ ( -- ) \ core left-bracket
560: ['] interpreter IS parser state off ; immediate
561: : ] ( -- ) \ core right-bracket
562: ['] compiler IS parser state on ;
563:
564: \ Strings 22feb93py
565:
566: : ," ( "string"<"> -- ) [char] " parse
567: here over char+ allot place align ;
568: : "lit ( -- addr )
569: r> r> dup count + aligned >r swap >r ;
570: : (.") "lit count type ;
571: : (S") "lit count ;
572: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
573: postpone (S") here over char+ allot place align ;
574: immediate restrict
575: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren
576: BEGIN
577: >in @ [char] ) parse nip >in @ rot - =
578: WHILE
579: loadfile @ IF
580: refill 0= abort" missing ')' in paren comment"
581: THEN
582: REPEAT ; immediate
583: : \ ( -- ) \ core-ext backslash
584: blk @
585: IF
586: >in @ c/l / 1+ c/l * >in !
587: EXIT
588: THEN
589: source >in ! drop ; immediate
590:
591: : \G ( -- ) \ gforth backslash
592: POSTPONE \ ; immediate
593:
594: \ error handling 22feb93py
595: \ 'abort thrown out! 11may93jaw
596:
597: : (abort")
598: "lit >r
599: IF
600: r> "error ! -2 throw
601: THEN
602: rdrop ;
603: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
604: postpone (abort") ," ; immediate restrict
605:
606: \ Header states 23feb93py
607:
608: : cset ( bmask c-addr -- )
609: tuck c@ or swap c! ;
610: : creset ( bmask c-addr -- )
611: tuck c@ swap invert and swap c! ;
612: : ctoggle ( bmask c-addr -- )
613: tuck c@ xor swap c! ;
614:
615: : lastflags ( -- c-addr )
616: \ the address of the flags byte in the last header
617: \ aborts if the last defined word was headerless
618: last @ dup 0= abort" last word was headerless" cell+ ;
619:
620: : immediate ( -- ) \ core
621: immediate-mask lastflags cset ;
622: : restrict ( -- ) \ gforth
623: restrict-mask lastflags cset ;
624: ' restrict alias compile-only ( -- ) \ gforth
625:
626: \ Header 23feb93py
627:
628: \ input-stream, nextname and noname are quite ugly (passing
629: \ information through global variables), but they are useful for dealing
630: \ with existing/independent defining words
631:
632: defer (header)
633: defer header ( -- ) \ gforth
634: ' (header) IS header
635:
636: : string, ( c-addr u -- ) \ gforth
637: \G puts down string as cstring
638: dup c, here swap chars dup allot move ;
639:
640: : header, ( c-addr u -- ) \ gforth
641: name-too-long?
642: align here last !
643: current @ 1 or A, \ link field; before revealing, it contains the
644: \ tagged reveal-into wordlist
645: string, cfalign
646: alias-mask lastflags cset ;
647:
648: : input-stream-header ( "name" -- )
649: name name-too-short? header, ;
650: : input-stream ( -- ) \ general
651: \G switches back to getting the name from the input stream ;
652: ['] input-stream-header IS (header) ;
653:
654: ' input-stream-header IS (header)
655:
656: \ !! make that a 2variable
657: create nextname-buffer 32 chars allot
658:
659: : nextname-header ( -- )
660: nextname-buffer count header,
661: input-stream ;
662:
663: \ the next name is given in the string
664: : nextname ( c-addr u -- ) \ gforth
665: name-too-long?
666: nextname-buffer c! ( c-addr )
667: nextname-buffer count move
668: ['] nextname-header IS (header) ;
669:
670: : noname-header ( -- )
671: 0 last ! cfalign
672: input-stream ;
673:
674: : noname ( -- ) \ gforth
675: \ the next defined word remains anonymous. The xt of that word is given by lastxt
676: ['] noname-header IS (header) ;
677:
678: : lastxt ( -- xt ) \ gforth
679: \ 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
680: lastcfa @ ;
681:
682: : Alias ( cfa "name" -- ) \ gforth
683: Header reveal
684: alias-mask lastflags creset
685: dup A, lastcfa ! ;
686:
687: : name>string ( nt -- addr count ) \ gforth name-to-string
688: \g @var{addr count} is the name of the word represented by @var{nt}.
689: cell+ count $1F and ;
690:
691: Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
692: : >name ( cfa -- nt ) \ gforth to-name
693: $21 cell do
694: dup i - count $9F and + cfaligned over alias-mask + = if
695: i - cell - unloop exit
696: then
697: cell +loop
698: drop ??? ( wouldn't 0 be better? ) ;
699:
700: \ threading 17mar93py
701:
702: : cfa, ( code-address -- ) \ gforth cfa-comma
703: here
704: dup lastcfa !
705: 0 A, 0 , code-address! ;
706: : compile, ( xt -- ) \ core-ext compile-comma
707: A, ;
708: : !does ( addr -- ) \ gforth store-does
709: lastxt does-code! ;
710: : (does>) ( R: addr -- )
711: r> /does-handler + !does ;
712: : dodoes, ( -- )
713: here /does-handler allot does-handler! ;
714:
715: : Create ( "name" -- ) \ core
716: Header reveal dovar: cfa, ;
717:
718: \ Create Variable User Constant 17mar93py
719:
720: : Variable ( "name" -- ) \ core
721: Create 0 , ;
722: : AVariable ( "name" -- ) \ gforth
723: Create 0 A, ;
724: : 2VARIABLE ( "name" -- ) \ double
725: create 0 , 0 , ;
726:
727: : User ( "name" -- ) \ gforth
728: Variable ;
729: : AUser ( "name" -- ) \ gforth
730: AVariable ;
731:
732: : (Constant) Header reveal docon: cfa, ;
733: : Constant ( w "name" -- ) \ core
734: \G Defines constant @var{name}
735: \G
736: \G @var{name} execution: @var{-- w}
737: (Constant) , ;
738: : AConstant ( addr "name" -- ) \ gforth
739: (Constant) A, ;
740:
741: : 2Constant ( w1 w2 "name" -- ) \ double
742: Create ( w1 w2 "name" -- )
743: 2,
744: DOES> ( -- w1 w2 )
745: 2@ ;
746:
747: \ IS Defer What's Defers TO 24feb93py
748:
749: : Defer ( "name" -- ) \ gforth
750: \ !! shouldn't it be initialized with abort or something similar?
751: Header Reveal dodefer: cfa,
752: ['] noop A, ;
753: \ Create ( -- )
754: \ ['] noop A,
755: \ DOES> ( ??? )
756: \ perform ;
757:
758: : Defers ( "name" -- ) \ gforth
759: ' >body @ compile, ; immediate
760:
761: \ : ; 24feb93py
762:
763: defer :-hook ( sys1 -- sys2 )
764: defer ;-hook ( sys2 -- sys1 )
765:
766: : : ( "name" -- colon-sys ) \ core colon
767: Header docol: cfa, defstart ] :-hook ;
768: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
769: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
770:
771: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
772: 0 last !
773: cfalign here docol: cfa, 0 ] :-hook ;
774:
775: \ Search list handling 23feb93py
776:
777: AVariable current ( -- addr ) \ gforth
778:
779: : last? ( -- false / nfa nfa )
780: last @ ?dup ;
781: : (reveal) ( nt wid -- )
782: ( wid>wordlist-id ) dup >r
783: @ over ( name>link ) !
784: r> ! ;
785:
786: \ object oriented search list 17mar93py
787:
788: \ word list structure:
789:
790: struct
791: 1 cells: field find-method \ xt: ( c_addr u wid -- nt )
792: 1 cells: field reveal-method \ xt: ( nt wid -- ) \ used by dofield:, must be field
793: 1 cells: field rehash-method \ xt: ( wid -- )
794: \ \ !! what else
795: end-struct wordlist-map-struct
796:
797: struct
798: 1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
799: 1 cells: field wordlist-map \ pointer to a wordlist-map-struct
800: 1 cells: field wordlist-link \ link field to other wordlists
801: 1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
802: end-struct wordlist-struct
803:
804: : f83find ( addr len wordlist -- nt / false )
805: ( wid>wordlist-id ) @ (f83find) ;
806:
807: \ Search list table: find reveal
808: Create f83search ( -- wordlist-map )
809: ' f83find A, ' (reveal) A, ' drop A,
810:
811: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
812: AVariable lookup G forth-wordlist lookup T !
813: G forth-wordlist current T !
814:
815: \ higher level parts of find
816:
817: ( struct )
818: 0 >body cell
819: 1 cells: field interpret/compile-int
820: 1 cells: field interpret/compile-comp
821: end-struct interpret/compile-struct
822:
823: : interpret/compile? ( xt -- flag )
824: >does-code ['] S" >does-code = ;
825:
826: : (cfa>int) ( cfa -- xt )
827: dup interpret/compile?
828: if
829: interpret/compile-int @
830: then ;
831:
832: : (x>int) ( cfa b -- xt )
833: \ get interpretation semantics of name
834: restrict-mask and
835: if
836: drop ['] compile-only-error
837: else
838: (cfa>int)
839: then ;
840:
841: : name>int ( nt -- xt ) \ gforth
842: \G @var{xt} represents the interpretation semantics of the word
843: \G @var{nt}. Produces @code{' compile-only-error} if
844: \G @var{nt} is compile-only.
845: (name>x) (x>int) ;
846:
847: : name?int ( nt -- xt ) \ gforth
848: \G Like name>int, but throws an error if compile-only.
849: (name>x) restrict-mask and
850: if
851: compile-only-error \ does not return
852: then
853: (cfa>int) ;
854:
855: : name>comp ( nt -- w xt ) \ gforth
856: \G @var{w xt} is the compilation token for the word @var{nt}.
857: (name>x) >r dup interpret/compile?
858: if
859: interpret/compile-comp @
860: then
861: r> immediate-mask and if
862: ['] execute
863: else
864: ['] compile,
865: then ;
866:
867: : (search-wordlist) ( addr count wid -- nt / false )
868: dup wordlist-map @ find-method perform ;
869:
870: : flag-sign ( f -- 1|-1 )
871: \ true becomes 1, false -1
872: 0= 2* 1+ ;
873:
874: : (name>intn) ( nfa -- xt +-1 )
875: (name>x) tuck (x>int) ( b xt )
876: swap immediate-mask and flag-sign ;
877:
878: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
879: \ xt is the interpretation semantics
880: (search-wordlist) dup if
881: (name>intn)
882: then ;
883:
884: : find-name ( c-addr u -- nt/0 ) \ gforth
885: \g Find the name @var{c-addr u} in the current search
886: \g order. Return its nt, if found, otherwise 0.
887: lookup @ (search-wordlist) ;
888:
889: : sfind ( c-addr u -- 0 / xt +-1 ) \ gforth-obsolete
890: find-name dup
891: if ( nt )
892: state @
893: if
894: name>comp ['] execute = flag-sign
895: else
896: (name>intn)
897: then
898: then ;
899:
900: : find ( c-addr -- xt +-1 / c-addr 0 ) \ core
901: dup count sfind dup
902: if
903: rot drop
904: then ;
905:
906: : (') ( "name" -- nt ) \ gforth
907: name find-name dup 0=
908: IF
909: drop -&13 bounce
910: THEN ;
911:
912: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
913: (') postpone ALiteral ; immediate restrict
914:
915: : ' ( "name" -- xt ) \ core tick
916: \g @var{xt} represents @var{name}'s interpretation
917: \g semantics. Performs @code{-14 throw} if the word has no
918: \g interpretation semantics.
919: (') name?int ;
920: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
921: \g @var{xt} represents @var{name}'s interpretation
922: \g semantics. Performs @code{-14 throw} if the word has no
923: \g interpretation semantics.
924: ' postpone ALiteral ; immediate restrict
925:
926: : COMP' ( "name" -- w xt ) \ gforth c-tick
927: \g @var{w xt} represents @var{name}'s compilation semantics.
928: (') name>comp ;
929: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
930: \g @var{w xt} represents @var{name}'s compilation semantics.
931: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
932:
933: \ reveal words
934:
935: Variable warnings ( -- addr ) \ gforth
936: G -1 warnings T !
937:
938: : check-shadow ( addr count wid -- )
939: \G prints a warning if the string is already present in the wordlist
940: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
941: ." redefined " name>string 2dup type
942: compare 0<> if
943: ." with " type
944: else
945: 2drop
946: then
947: space space EXIT
948: then
949: 2drop 2drop ;
950:
951: : reveal ( -- ) \ gforth
952: last?
953: if \ the last word has a header
954: dup ( name>link ) @ 1 and
955: if \ it is still hidden
956: dup ( name>link ) @ 1 xor ( nt wid )
957: 2dup >r name>string r> check-shadow ( nt wid )
958: dup wordlist-map @ reveal-method perform
959: then
960: then ;
961:
962: : rehash ( wid -- )
963: dup wordlist-map @ rehash-method perform ;
964:
965: \ Input 13feb93py
966:
967: 07 constant #bell ( -- c ) \ gforth
968: 08 constant #bs ( -- c ) \ gforth
969: 09 constant #tab ( -- c ) \ gforth
970: 7F constant #del ( -- c ) \ gforth
971: 0D constant #cr ( -- c ) \ gforth
972: \ the newline key code
973: 0C constant #ff ( -- c ) \ gforth
974: 0A constant #lf ( -- c ) \ gforth
975:
976: : bell #bell emit ;
977: : cr ( -- ) \ core
978: \ emit a newline
979: #lf ( sic! ) emit ;
980:
981: \ : backspaces 0 ?DO #bs emit LOOP ;
982:
983: : (ins) ( max span addr pos1 key -- max span addr pos2 )
984: >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
985: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
986: dup IF
987: #bs emit bl emit #bs emit 1- rot 1- -rot
988: THEN false ;
989: : (ret) true space ;
990:
991: Create ctrlkeys
992: ] false false false false false false false false
993: (bs) false (ret) false false (ret) false false
994: false false false false false false false false
995: false false false false false false false false [
996:
997: defer insert-char
998: ' (ins) IS insert-char
999: defer everychar
1000: ' noop IS everychar
1001:
1002: : decode ( max span addr pos1 key -- max span addr pos2 flag )
1003: everychar
1004: dup #del = IF drop #bs THEN \ del is rubout
1005: dup bl < IF cells ctrlkeys + perform EXIT THEN
1006: >r 2over = IF rdrop bell 0 EXIT THEN
1007: r> insert-char 0 ;
1008:
1009: : accept ( addr len -- len ) \ core
1010: dup 0< IF abs over dup 1 chars - c@ tuck type
1011: \ this allows to edit given strings
1012: ELSE 0 THEN rot over
1013: BEGIN key decode UNTIL
1014: 2drop nip ;
1015:
1016: \ Output 13feb93py
1017:
1018: : (type) ( c-addr u -- ) \ gforth
1019: outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1020: ;
1021:
1022: Defer type ( c-addr u -- ) \ core
1023: \ defer type for a output buffer or fast
1024: \ screen write
1025:
1026: ' (type) IS Type
1027:
1028: : (emit) ( c -- ) \ gforth
1029: outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1030: ;
1031:
1032: Defer emit ( c -- ) \ core
1033: ' (Emit) IS Emit
1034:
1035: Defer key ( -- c ) \ core
1036: ' (key) IS key
1037:
1038: \ Query 07apr93py
1039:
1040: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1041: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
1042: tib /line
1043: loadfile @ ?dup
1044: IF read-line throw
1045: ELSE sourceline# 0< IF 2drop false EXIT THEN
1046: accept true
1047: THEN
1048: 1 loadline +!
1049: swap #tib ! 0 >in ! ;
1050:
1051: : query ( -- ) \ core-ext
1052: \G obsolescent
1053: tib /line accept #tib ! 0 >in ! ;
1054:
1055: \ File specifiers 11jun93jaw
1056:
1057:
1058: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
1059: \ 2 c, here char r c, char + c, 0 c,
1060: \ 2 c, here char w c, char + c, 0 c, align
1061: 4 Constant w/o ( -- fam ) \ file w-o
1062: 2 Constant r/w ( -- fam ) \ file r-w
1063: 0 Constant r/o ( -- fam ) \ file r-o
1064:
1065: \ BIN WRITE-LINE 11jun93jaw
1066:
1067: \ : bin dup 1 chars - c@
1068: \ r/o 4 chars + over - dup >r swap move r> ;
1069:
1070: : bin ( fam1 -- fam2 ) \ file
1071: 1 or ;
1072:
1073: : write-line ( c-addr u fileid -- ior ) \ file
1074: dup >r write-file
1075: ?dup IF
1076: r> drop EXIT
1077: THEN
1078: #lf r> emit-file ;
1079:
1080: \ include-file 07apr93py
1081:
1082: : push-file ( -- ) r>
1083: sourceline# >r loadfile @ >r
1084: blk @ >r tibstack @ >r >tib @ >r #tib @ >r
1085: >tib @ tibstack @ = IF r@ tibstack +! THEN
1086: tibstack @ >tib ! >in @ >r >r ;
1087:
1088: : pop-file ( throw-code -- throw-code )
1089: dup IF
1090: source >in @ sourceline# sourcefilename
1091: error-stack dup @ dup 1+
1092: max-errors 1- min error-stack !
1093: 6 * cells + cell+
1094: 5 cells bounds swap DO
1095: I !
1096: -1 cells +LOOP
1097: THEN
1098: r>
1099: r> >in ! r> #tib ! r> >tib ! r> tibstack ! r> blk !
1100: r> loadfile ! r> loadline ! >r ;
1101:
1102: : read-loop ( i*x -- j*x )
1103: BEGIN refill WHILE interpret REPEAT ;
1104:
1105: : include-file ( i*x fid -- j*x ) \ file
1106: push-file loadfile !
1107: 0 loadline ! blk off ['] read-loop catch
1108: loadfile @ close-file swap 2dup or
1109: pop-file drop throw throw ;
1110:
1111: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
1112:
1113: \ : check-file-prefix ( addr len -- addr' len' flag )
1114: \ dup 0= IF true EXIT THEN
1115: \ over c@ '/ = IF true EXIT THEN
1116: \ over 2 S" ./" compare 0= IF true EXIT THEN
1117: \ over 3 S" ../" compare 0= IF true EXIT THEN
1118: \ over 2 S" ~/" compare 0=
1119: \ IF 1 /string
1120: \ S" HOME" getenv tuck pathfilenamebuf swap move
1121: \ 2dup + >r pathfilenamebuf + swap move
1122: \ pathfilenamebuf r> true
1123: \ ELSE false
1124: \ THEN ;
1125:
1126: : absolut-path? ( addr u -- flag ) \ gforth
1127: \G a path is absolute, if it starts with a / or a ~ (~ expansion),
1128: \G or if it is in the form ./* or ../*, extended regexp: ^[/~]|./|../
1129: \G Pathes simply containing a / are not absolute!
1130: over c@ '/ = >r
1131: over c@ '~ = >r
1132: 2dup 2 min S" ./" compare 0= >r
1133: 3 min S" ../" compare 0=
1134: r> r> r> or or or ;
1135: \ [char] / scan nip 0<> ;
1136:
1137: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
1138: \G opens a file for reading, searching in the path for it (unless
1139: \G the filename contains a slash); c-addr2 u2 is the full filename
1140: \G (valid until the next call); if the file is not found (or in
1141: \G case of other errors for each try), -38 (non-existant file) is
1142: \G thrown. Opening for other access modes makes little sense, as
1143: \G the path will usually contain dirs that are only readable for
1144: \G the user
1145: \ !! use file-status to determine access mode?
1146: 2dup absolut-path?
1147: if \ the filename contains a slash
1148: 2dup r/o open-file throw ( c-addr1 u1 file-id )
1149: -rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
1150: pathfilenamebuf r> EXIT
1151: then
1152: pathdirs 2@ 0
1153: \ check-file-prefix 0=
1154: \ IF pathdirs 2@ 0
1155: ?DO ( c-addr1 u1 dirnamep )
1156: dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
1157: 2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
1158: pathfilenamebuf over r> + dup >r r/o open-file 0=
1159: IF ( addr u file-id )
1160: nip nip r> rdrop 0 LEAVE
1161: THEN
1162: rdrop drop r> cell+ cell+
1163: LOOP
1164: \ ELSE 2dup open-file throw -rot THEN
1165: 0<> -&38 and throw ( file-id u2 )
1166: pathfilenamebuf swap ;
1167:
1168: create included-files 0 , 0 , ( pointer to and count of included files )
1169: here ," the terminal" dup c@ swap 1 + swap , A, here 2 cells -
1170: create image-included-files 1 , A, ( pointer to and count of included files )
1171: \ included-files points to ALLOCATEd space, while image-included-files
1172: \ points to ALLOTed objects, so it survives a save-system
1173:
1174: : loadfilename ( -- a-addr )
1175: \G a-addr 2@ produces the current file name ( c-addr u )
1176: included-files 2@ drop loadfilename# @ 2* cells + ;
1177:
1178: : sourcefilename ( -- c-addr u ) \ gforth
1179: \G the name of the source file which is currently the input
1180: \G source. The result is valid only while the file is being
1181: \G loaded. If the current input source is no (stream) file, the
1182: \G result is undefined.
1183: loadfilename 2@ ;
1184:
1185: : sourceline# ( -- u ) \ gforth sourceline-number
1186: \G the line number of the line that is currently being interpreted
1187: \G from a (stream) file. The first line has the number 1. If the
1188: \G current input source is no (stream) file, the result is
1189: \G undefined.
1190: loadline @ ;
1191:
1192: : init-included-files ( -- )
1193: image-included-files 2@ 2* cells save-mem drop ( addr )
1194: image-included-files 2@ nip included-files 2! ;
1195:
1196: : included? ( c-addr u -- f ) \ gforth
1197: \G true, iff filename c-addr u is in included-files
1198: included-files 2@ 0
1199: ?do ( c-addr u addr )
1200: dup >r 2@ 2over compare 0=
1201: if
1202: 2drop rdrop unloop
1203: true EXIT
1204: then
1205: r> cell+ cell+
1206: loop
1207: 2drop drop false ;
1208:
1209: : add-included-file ( c-addr u -- ) \ gforth
1210: \G add name c-addr u to included-files
1211: included-files 2@ 2* cells 2 cells extend-mem
1212: 2/ cell / included-files 2!
1213: 2! ;
1214: \ included-files 2@ tuck 1+ 2* cells resize throw
1215: \ swap 2dup 1+ included-files 2!
1216: \ 2* cells + 2! ;
1217:
1218: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1219: \G include the file file-id with the name given by c-addr u
1220: loadfilename# @ >r
1221: save-mem add-included-file ( file-id )
1222: included-files 2@ nip 1- loadfilename# !
1223: ['] include-file catch
1224: r> loadfilename# !
1225: throw ;
1226:
1227: : included ( i*x addr u -- j*x ) \ file
1228: open-path-file included1 ;
1229:
1230: : required ( i*x addr u -- j*x ) \ gforth
1231: \G include the file with the name given by addr u, if it is not
1232: \G included already. Currently this works by comparing the name of
1233: \G the file (with path) against the names of earlier included
1234: \G files; however, it would probably be better to fstat the file,
1235: \G and compare the device and inode. The advantages would be: no
1236: \G problems with several paths to the same file (e.g., due to
1237: \G links) and we would catch files included with include-file and
1238: \G write a require-file.
1239: open-path-file 2dup included?
1240: if
1241: 2drop close-file throw
1242: else
1243: included1
1244: then ;
1245:
1246: \ HEX DECIMAL 2may93jaw
1247:
1248: : decimal ( -- ) \ core
1249: a base ! ;
1250: : hex ( -- ) \ core-ext
1251: 10 base ! ;
1252:
1253: \ DEPTH 9may93jaw
1254:
1255: : depth ( -- +n ) \ core
1256: sp@ s0 @ swap - cell / ;
1257: : clearstack ( ... -- )
1258: s0 @ sp! ;
1259:
1260: \ INCLUDE 9may93jaw
1261:
1262: : include ( "file" -- ) \ gforth
1263: name included ;
1264:
1265: : require ( "file" -- ) \ gforth
1266: name required ;
1267:
1268: \ RECURSE 17may93jaw
1269:
1270: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1271: lastxt compile, ; immediate restrict
1272: ' reveal alias recursive ( -- ) \ gforth
1273: immediate
1274:
1275: \ */MOD */ 17may93jaw
1276:
1277: \ !! I think */mod should have the same rounding behaviour as / - anton
1278: : */mod ( n1 n2 n3 -- n4 n5 ) \ core star-slash-mod
1279: >r m* r> sm/rem ;
1280:
1281: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
1282: */mod nip ;
1283:
1284: \ EVALUATE 17may93jaw
1285:
1286: : evaluate ( c-addr len -- ) \ core,block
1287: push-file #tib ! >tib !
1288: >in off blk off loadfile off -1 loadline !
1289: ['] interpret catch
1290: pop-file throw ;
1291:
1292: : abort ( ?? -- ?? ) \ core,exception-ext
1293: -1 throw ;
1294:
1295: \+ environment? true ENV" CORE"
1296: \ core wordset is now complete!
1297:
1298: \ Quit 13feb93py
1299:
1300: Defer 'quit
1301: Defer .status
1302: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
1303: : (Query) ( -- )
1304: loadfile off blk off refill drop ;
1305: : (quit) BEGIN .status cr (query) interpret prompt AGAIN ;
1306: ' (quit) IS 'quit
1307:
1308: \ DOERROR (DOERROR) 13jun93jaw
1309:
1310: 8 Constant max-errors
1311: Variable error-stack 0 error-stack !
1312: max-errors 6 * cells allot
1313: \ format of one cell:
1314: \ source ( addr u )
1315: \ >in
1316: \ line-number
1317: \ Loadfilename ( addr u )
1318:
1319: : dec. ( n -- ) \ gforth
1320: \ print value in decimal representation
1321: base @ decimal swap . base ! ;
1322:
1323: : hex. ( u -- ) \ gforth
1324: \ print value as unsigned hex number
1325: '$ emit base @ swap hex u. base ! ;
1326:
1327: : typewhite ( addr u -- ) \ gforth
1328: \ like type, but white space is printed instead of the characters
1329: bounds ?do
1330: i c@ #tab = if \ check for tab
1331: #tab
1332: else
1333: bl
1334: then
1335: emit
1336: loop ;
1337:
1338: DEFER DOERROR
1339:
1340: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
1341: cr error-stack @
1342: IF
1343: ." in file included from "
1344: type ." :" dec. drop 2drop
1345: ELSE
1346: type ." :" dec.
1347: cr dup 2over type cr drop
1348: nip -trailing 1- ( line-start index2 )
1349: 0 >r BEGIN
1350: 2dup + c@ bl > WHILE
1351: r> 1+ >r 1- dup 0< UNTIL THEN 1+
1352: ( line-start index1 )
1353: typewhite
1354: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
1355: [char] ^ emit
1356: loop
1357: THEN
1358: ;
1359:
1360: : (DoError) ( throw-code -- )
1361: sourceline# IF
1362: source >in @ sourceline# 0 0 .error-frame
1363: THEN
1364: error-stack @ 0 ?DO
1365: -1 error-stack +!
1366: error-stack dup @ 6 * cells + cell+
1367: 6 cells bounds DO
1368: I @
1369: cell +LOOP
1370: .error-frame
1371: LOOP
1372: dup -2 =
1373: IF
1374: "error @ ?dup
1375: IF
1376: cr count type
1377: THEN
1378: drop
1379: ELSE
1380: .error
1381: THEN
1382: normal-dp dpp ! ;
1383:
1384: ' (DoError) IS DoError
1385:
1386: : quit ( ?? -- ?? ) \ core
1387: r0 @ rp! handler off >tib @ >r
1388: BEGIN
1389: postpone [
1390: ['] 'quit CATCH dup
1391: WHILE
1392: DoError r@ >tib ! r@ tibstack !
1393: REPEAT
1394: drop r> >tib ! ;
1395:
1396: \ Cold 13feb93py
1397:
1398: \ : .name ( name -- ) name>string type space ;
1399: \ : words listwords @
1400: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
1401:
1402: : cstring>sstring ( cstring -- addr n ) \ gforth cstring-to-sstring
1403: -1 0 scan 0 swap 1+ /string ;
1404: : arg ( n -- addr count ) \ gforth
1405: cells argv @ + @ cstring>sstring ;
1406: : #! postpone \ ; immediate
1407:
1408: Create pathstring 2 cells allot \ string
1409: Create pathdirs 2 cells allot \ dir string array, pointer and count
1410: Variable argv
1411: Variable argc
1412:
1413: 0 Value script? ( -- flag )
1414:
1415: : process-path ( addr1 u1 -- addr2 u2 )
1416: \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
1417: align here >r
1418: BEGIN
1419: over >r 0 scan
1420: over r> tuck - ( rest-str this-str )
1421: dup
1422: IF
1423: 2dup 1- chars + c@ [char] / <>
1424: IF
1425: 2dup chars + [char] / swap c!
1426: 1+
1427: THEN
1428: 2,
1429: ELSE
1430: 2drop
1431: THEN
1432: dup
1433: WHILE
1434: 1 /string
1435: REPEAT
1436: 2drop
1437: here r> tuck - 2 cells / ;
1438:
1439: : do-option ( addr1 len1 addr2 len2 -- n )
1440: 2swap
1441: 2dup s" -e" compare 0= >r
1442: 2dup s" --evaluate" compare 0= r> or
1443: IF 2drop dup >r ['] evaluate catch
1444: ?dup IF dup >r DoError r> negate (bye) THEN
1445: r> >tib +! 2 EXIT THEN
1446: ." Unknown option: " type cr 2drop 1 ;
1447:
1448: : process-args ( -- )
1449: >tib @ >r
1450: argc @ 1
1451: ?DO
1452: I arg over c@ [char] - <>
1453: IF
1454: required 1
1455: ELSE
1456: I 1+ argc @ = IF s" " ELSE I 1+ arg THEN
1457: do-option
1458: THEN
1459: +LOOP
1460: r> >tib ! ;
1461:
1462: Defer 'cold ' noop IS 'cold
1463:
1464: : cold ( -- ) \ gforth
1465: stdout TO outfile-id
1466: pathstring 2@ process-path pathdirs 2!
1467: init-included-files
1468: 'cold
1469: argc @ 1 >
1470: IF
1471: true to script?
1472: ['] process-args catch ?dup
1473: IF
1474: dup >r DoError cr r> negate (bye)
1475: THEN
1476: cr
1477: THEN
1478: false to script?
1479: ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
1480: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
1481: ." Type `bye' to exit"
1482: loadline off quit ;
1483:
1484: : license ( -- ) \ gforth
1485: cr
1486: ." This program is free software; you can redistribute it and/or modify" cr
1487: ." it under the terms of the GNU General Public License as published by" cr
1488: ." the Free Software Foundation; either version 2 of the License, or" cr
1489: ." (at your option) any later version." cr cr
1490:
1491: ." This program is distributed in the hope that it will be useful," cr
1492: ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
1493: ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" cr
1494: ." GNU General Public License for more details." cr cr
1495:
1496: ." You should have received a copy of the GNU General Public License" cr
1497: ." along with this program; if not, write to the Free Software" cr
1498: ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
1499:
1500: : boot ( path **argv argc -- )
1501: argc ! argv ! pathstring 2! main-task up!
1502: sp@ s0 !
1503: lp@ forthstart 7 cells + @ - dup >tib ! tibstack ! #tib off >in off
1504: rp@ r0 !
1505: fp@ f0 !
1506: ['] cold catch DoError
1507: bye ;
1508:
1509: : bye ( -- ) \ tools-ext
1510: script? 0= IF cr THEN 0 (bye) ;
1511:
1512: \ **argv may be scanned by the C starter to get some important
1513: \ information, as -display and -geometry for an X client FORTH
1514: \ or space and stackspace overrides
1515:
1516: \ 0 arg contains, however, the name of the program.
1517:
1518:
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