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: : plain-( ( 'ccc<close-paren>' -- ; )
576: [char] ) parse 2drop ;
577:
578: : file-( ( 'ccc<close-paren>' -- ; )
579: BEGIN
580: >in @
581: [char] ) parse nip
582: >in @ rot - = \ is there no delimter?
583: WHILE
584: refill 0=
585: IF
586: warnings @
587: IF
588: ." warning: ')' missing" cr
589: THEN
590: EXIT
591: THEN
592: REPEAT ;
593:
594: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren
595: loadfile @
596: IF
597: file-(
598: ELSE
599: plain-(
600: THEN ; immediate
601:
602: : \ ( -- ) \ core-ext backslash
603: blk @
604: IF
605: >in @ c/l / 1+ c/l * >in !
606: EXIT
607: THEN
608: source >in ! drop ; immediate
609:
610: : \G ( -- ) \ gforth backslash
611: POSTPONE \ ; immediate
612:
613: \ error handling 22feb93py
614: \ 'abort thrown out! 11may93jaw
615:
616: : (abort")
617: "lit >r
618: IF
619: r> "error ! -2 throw
620: THEN
621: rdrop ;
622: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
623: postpone (abort") ," ; immediate restrict
624:
625: \ Header states 23feb93py
626:
627: : cset ( bmask c-addr -- )
628: tuck c@ or swap c! ;
629: : creset ( bmask c-addr -- )
630: tuck c@ swap invert and swap c! ;
631: : ctoggle ( bmask c-addr -- )
632: tuck c@ xor swap c! ;
633:
634: : lastflags ( -- c-addr )
635: \ the address of the flags byte in the last header
636: \ aborts if the last defined word was headerless
637: last @ dup 0= abort" last word was headerless" cell+ ;
638:
639: : immediate ( -- ) \ core
640: immediate-mask lastflags cset ;
641: : restrict ( -- ) \ gforth
642: restrict-mask lastflags cset ;
643: ' restrict alias compile-only ( -- ) \ gforth
644:
645: \ Header 23feb93py
646:
647: \ input-stream, nextname and noname are quite ugly (passing
648: \ information through global variables), but they are useful for dealing
649: \ with existing/independent defining words
650:
651: defer (header)
652: defer header ( -- ) \ gforth
653: ' (header) IS header
654:
655: : string, ( c-addr u -- ) \ gforth
656: \G puts down string as cstring
657: dup c, here swap chars dup allot move ;
658:
659: : header, ( c-addr u -- ) \ gforth
660: name-too-long?
661: align here last !
662: current @ 1 or A, \ link field; before revealing, it contains the
663: \ tagged reveal-into wordlist
664: string, cfalign
665: alias-mask lastflags cset ;
666:
667: : input-stream-header ( "name" -- )
668: name name-too-short? header, ;
669: : input-stream ( -- ) \ general
670: \G switches back to getting the name from the input stream ;
671: ['] input-stream-header IS (header) ;
672:
673: ' input-stream-header IS (header)
674:
675: \ !! make that a 2variable
676: create nextname-buffer 32 chars allot
677:
678: : nextname-header ( -- )
679: nextname-buffer count header,
680: input-stream ;
681:
682: \ the next name is given in the string
683: : nextname ( c-addr u -- ) \ gforth
684: name-too-long?
685: nextname-buffer c! ( c-addr )
686: nextname-buffer count move
687: ['] nextname-header IS (header) ;
688:
689: : noname-header ( -- )
690: 0 last ! cfalign
691: input-stream ;
692:
693: : noname ( -- ) \ gforth
694: \ the next defined word remains anonymous. The xt of that word is given by lastxt
695: ['] noname-header IS (header) ;
696:
697: : lastxt ( -- xt ) \ gforth
698: \ 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
699: lastcfa @ ;
700:
701: : Alias ( cfa "name" -- ) \ gforth
702: Header reveal
703: alias-mask lastflags creset
704: dup A, lastcfa ! ;
705:
706: : name>string ( nt -- addr count ) \ gforth name-to-string
707: \g @var{addr count} is the name of the word represented by @var{nt}.
708: cell+ count $1F and ;
709:
710: Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
711: : >name ( cfa -- nt ) \ gforth to-name
712: $21 cell do
713: dup i - count $9F and + cfaligned over alias-mask + = if
714: i - cell - unloop exit
715: then
716: cell +loop
717: drop ??? ( wouldn't 0 be better? ) ;
718:
719: \ threading 17mar93py
720:
721: : cfa, ( code-address -- ) \ gforth cfa-comma
722: here
723: dup lastcfa !
724: 0 A, 0 , code-address! ;
725: : compile, ( xt -- ) \ core-ext compile-comma
726: A, ;
727: : !does ( addr -- ) \ gforth store-does
728: lastxt does-code! ;
729: : (does>) ( R: addr -- )
730: r> /does-handler + !does ;
731: : dodoes, ( -- )
732: here /does-handler allot does-handler! ;
733:
734: : Create ( "name" -- ) \ core
735: Header reveal dovar: cfa, ;
736:
737: \ Create Variable User Constant 17mar93py
738:
739: : Variable ( "name" -- ) \ core
740: Create 0 , ;
741: : AVariable ( "name" -- ) \ gforth
742: Create 0 A, ;
743: : 2VARIABLE ( "name" -- ) \ double
744: create 0 , 0 , ;
745:
746: : User ( "name" -- ) \ gforth
747: Variable ;
748: : AUser ( "name" -- ) \ gforth
749: AVariable ;
750:
751: : (Constant) Header reveal docon: cfa, ;
752: : Constant ( w "name" -- ) \ core
753: \G Defines constant @var{name}
754: \G
755: \G @var{name} execution: @var{-- w}
756: (Constant) , ;
757: : AConstant ( addr "name" -- ) \ gforth
758: (Constant) A, ;
759:
760: : 2Constant ( w1 w2 "name" -- ) \ double
761: Create ( w1 w2 "name" -- )
762: 2,
763: DOES> ( -- w1 w2 )
764: 2@ ;
765:
766: \ IS Defer What's Defers TO 24feb93py
767:
768: : Defer ( "name" -- ) \ gforth
769: \ !! shouldn't it be initialized with abort or something similar?
770: Header Reveal dodefer: cfa,
771: ['] noop A, ;
772: \ Create ( -- )
773: \ ['] noop A,
774: \ DOES> ( ??? )
775: \ perform ;
776:
777: : Defers ( "name" -- ) \ gforth
778: ' >body @ compile, ; immediate
779:
780: \ : ; 24feb93py
781:
782: defer :-hook ( sys1 -- sys2 )
783: defer ;-hook ( sys2 -- sys1 )
784:
785: : : ( "name" -- colon-sys ) \ core colon
786: Header docol: cfa, defstart ] :-hook ;
787: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
788: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
789:
790: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
791: 0 last !
792: cfalign here docol: cfa, 0 ] :-hook ;
793:
794: \ Search list handling 23feb93py
795:
796: AVariable current ( -- addr ) \ gforth
797:
798: : last? ( -- false / nfa nfa )
799: last @ ?dup ;
800: : (reveal) ( nt wid -- )
801: ( wid>wordlist-id ) dup >r
802: @ over ( name>link ) !
803: r> ! ;
804:
805: \ object oriented search list 17mar93py
806:
807: \ word list structure:
808:
809: struct
810: 1 cells: field find-method \ xt: ( c_addr u wid -- nt )
811: 1 cells: field reveal-method \ xt: ( nt wid -- ) \ used by dofield:, must be field
812: 1 cells: field rehash-method \ xt: ( wid -- )
813: \ \ !! what else
814: end-struct wordlist-map-struct
815:
816: struct
817: 1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
818: 1 cells: field wordlist-map \ pointer to a wordlist-map-struct
819: 1 cells: field wordlist-link \ link field to other wordlists
820: 1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
821: end-struct wordlist-struct
822:
823: : f83find ( addr len wordlist -- nt / false )
824: ( wid>wordlist-id ) @ (f83find) ;
825:
826: \ Search list table: find reveal
827: Create f83search ( -- wordlist-map )
828: ' f83find A, ' (reveal) A, ' drop A,
829:
830: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
831: AVariable lookup G forth-wordlist lookup T !
832: G forth-wordlist current T !
833:
834: \ higher level parts of find
835:
836: ( struct )
837: 0 >body cell
838: 1 cells: field interpret/compile-int
839: 1 cells: field interpret/compile-comp
840: end-struct interpret/compile-struct
841:
842: : interpret/compile? ( xt -- flag )
843: >does-code ['] S" >does-code = ;
844:
845: : (cfa>int) ( cfa -- xt )
846: dup interpret/compile?
847: if
848: interpret/compile-int @
849: then ;
850:
851: : (x>int) ( cfa b -- xt )
852: \ get interpretation semantics of name
853: restrict-mask and
854: if
855: drop ['] compile-only-error
856: else
857: (cfa>int)
858: then ;
859:
860: : name>int ( nt -- xt ) \ gforth
861: \G @var{xt} represents the interpretation semantics of the word
862: \G @var{nt}. Produces @code{' compile-only-error} if
863: \G @var{nt} is compile-only.
864: (name>x) (x>int) ;
865:
866: : name?int ( nt -- xt ) \ gforth
867: \G Like name>int, but throws an error if compile-only.
868: (name>x) restrict-mask and
869: if
870: compile-only-error \ does not return
871: then
872: (cfa>int) ;
873:
874: : name>comp ( nt -- w xt ) \ gforth
875: \G @var{w xt} is the compilation token for the word @var{nt}.
876: (name>x) >r dup interpret/compile?
877: if
878: interpret/compile-comp @
879: then
880: r> immediate-mask and if
881: ['] execute
882: else
883: ['] compile,
884: then ;
885:
886: : (search-wordlist) ( addr count wid -- nt / false )
887: dup wordlist-map @ find-method perform ;
888:
889: : flag-sign ( f -- 1|-1 )
890: \ true becomes 1, false -1
891: 0= 2* 1+ ;
892:
893: : (name>intn) ( nfa -- xt +-1 )
894: (name>x) tuck (x>int) ( b xt )
895: swap immediate-mask and flag-sign ;
896:
897: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
898: \ xt is the interpretation semantics
899: (search-wordlist) dup if
900: (name>intn)
901: then ;
902:
903: : find-name ( c-addr u -- nt/0 ) \ gforth
904: \g Find the name @var{c-addr u} in the current search
905: \g order. Return its nt, if found, otherwise 0.
906: lookup @ (search-wordlist) ;
907:
908: : sfind ( c-addr u -- 0 / xt +-1 ) \ gforth-obsolete
909: find-name dup
910: if ( nt )
911: state @
912: if
913: name>comp ['] execute = flag-sign
914: else
915: (name>intn)
916: then
917: then ;
918:
919: : find ( c-addr -- xt +-1 / c-addr 0 ) \ core
920: dup count sfind dup
921: if
922: rot drop
923: then ;
924:
925: : (') ( "name" -- nt ) \ gforth
926: name find-name dup 0=
927: IF
928: drop -&13 bounce
929: THEN ;
930:
931: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
932: (') postpone ALiteral ; immediate restrict
933:
934: : ' ( "name" -- xt ) \ core tick
935: \g @var{xt} represents @var{name}'s interpretation
936: \g semantics. Performs @code{-14 throw} if the word has no
937: \g interpretation semantics.
938: (') name?int ;
939: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
940: \g @var{xt} represents @var{name}'s interpretation
941: \g semantics. Performs @code{-14 throw} if the word has no
942: \g interpretation semantics.
943: ' postpone ALiteral ; immediate restrict
944:
945: : COMP' ( "name" -- w xt ) \ gforth c-tick
946: \g @var{w xt} represents @var{name}'s compilation semantics.
947: (') name>comp ;
948: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
949: \g @var{w xt} represents @var{name}'s compilation semantics.
950: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
951:
952: \ reveal words
953:
954: Variable warnings ( -- addr ) \ gforth
955: G -1 warnings T !
956:
957: : check-shadow ( addr count wid -- )
958: \G prints a warning if the string is already present in the wordlist
959: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
960: ." redefined " name>string 2dup type
961: compare 0<> if
962: ." with " type
963: else
964: 2drop
965: then
966: space space EXIT
967: then
968: 2drop 2drop ;
969:
970: : reveal ( -- ) \ gforth
971: last?
972: if \ the last word has a header
973: dup ( name>link ) @ 1 and
974: if \ it is still hidden
975: dup ( name>link ) @ 1 xor ( nt wid )
976: 2dup >r name>string r> check-shadow ( nt wid )
977: dup wordlist-map @ reveal-method perform
978: then
979: then ;
980:
981: : rehash ( wid -- )
982: dup wordlist-map @ rehash-method perform ;
983:
984: \ Input 13feb93py
985:
986: 07 constant #bell ( -- c ) \ gforth
987: 08 constant #bs ( -- c ) \ gforth
988: 09 constant #tab ( -- c ) \ gforth
989: 7F constant #del ( -- c ) \ gforth
990: 0D constant #cr ( -- c ) \ gforth
991: \ the newline key code
992: 0C constant #ff ( -- c ) \ gforth
993: 0A constant #lf ( -- c ) \ gforth
994:
995: : bell #bell emit ;
996: : cr ( -- ) \ core
997: \ emit a newline
998: #lf ( sic! ) emit ;
999:
1000: \ : backspaces 0 ?DO #bs emit LOOP ;
1001:
1002: : (ins) ( max span addr pos1 key -- max span addr pos2 )
1003: >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
1004: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
1005: dup IF
1006: #bs emit bl emit #bs emit 1- rot 1- -rot
1007: THEN false ;
1008: : (ret) true space ;
1009:
1010: Create ctrlkeys
1011: ] false false false false false false false false
1012: (bs) false (ret) false false (ret) false false
1013: false false false false false false false false
1014: false false false false false false false false [
1015:
1016: defer insert-char
1017: ' (ins) IS insert-char
1018: defer everychar
1019: ' noop IS everychar
1020:
1021: : decode ( max span addr pos1 key -- max span addr pos2 flag )
1022: everychar
1023: dup #del = IF drop #bs THEN \ del is rubout
1024: dup bl < IF cells ctrlkeys + perform EXIT THEN
1025: >r 2over = IF rdrop bell 0 EXIT THEN
1026: r> insert-char 0 ;
1027:
1028: : accept ( addr len -- len ) \ core
1029: dup 0< IF abs over dup 1 chars - c@ tuck type
1030: \ this allows to edit given strings
1031: ELSE 0 THEN rot over
1032: BEGIN key decode UNTIL
1033: 2drop nip ;
1034:
1035: \ Output 13feb93py
1036:
1037: : (type) ( c-addr u -- ) \ gforth
1038: outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1039: ;
1040:
1041: Defer type ( c-addr u -- ) \ core
1042: \ defer type for a output buffer or fast
1043: \ screen write
1044:
1045: ' (type) IS Type
1046:
1047: : (emit) ( c -- ) \ gforth
1048: outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1049: ;
1050:
1051: Defer emit ( c -- ) \ core
1052: ' (Emit) IS Emit
1053:
1054: Defer key ( -- c ) \ core
1055: ' (key) IS key
1056:
1057: \ Query 07apr93py
1058:
1059: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1060: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
1061: tib /line
1062: loadfile @ ?dup
1063: IF read-line throw
1064: ELSE sourceline# 0< IF 2drop false EXIT THEN
1065: accept true
1066: THEN
1067: 1 loadline +!
1068: swap #tib ! 0 >in ! ;
1069:
1070: : query ( -- ) \ core-ext
1071: \G obsolescent
1072: tib /line accept #tib ! 0 >in ! ;
1073:
1074: \ File specifiers 11jun93jaw
1075:
1076:
1077: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
1078: \ 2 c, here char r c, char + c, 0 c,
1079: \ 2 c, here char w c, char + c, 0 c, align
1080: 4 Constant w/o ( -- fam ) \ file w-o
1081: 2 Constant r/w ( -- fam ) \ file r-w
1082: 0 Constant r/o ( -- fam ) \ file r-o
1083:
1084: \ BIN WRITE-LINE 11jun93jaw
1085:
1086: \ : bin dup 1 chars - c@
1087: \ r/o 4 chars + over - dup >r swap move r> ;
1088:
1089: : bin ( fam1 -- fam2 ) \ file
1090: 1 or ;
1091:
1092: : write-line ( c-addr u fileid -- ior ) \ file
1093: dup >r write-file
1094: ?dup IF
1095: r> drop EXIT
1096: THEN
1097: #lf r> emit-file ;
1098:
1099: \ include-file 07apr93py
1100:
1101: : push-file ( -- ) r>
1102: sourceline# >r loadfile @ >r
1103: blk @ >r tibstack @ >r >tib @ >r #tib @ >r
1104: >tib @ tibstack @ = IF r@ tibstack +! THEN
1105: tibstack @ >tib ! >in @ >r >r ;
1106:
1107: : pop-file ( throw-code -- throw-code )
1108: dup IF
1109: source >in @ sourceline# sourcefilename
1110: error-stack dup @ dup 1+
1111: max-errors 1- min error-stack !
1112: 6 * cells + cell+
1113: 5 cells bounds swap DO
1114: I !
1115: -1 cells +LOOP
1116: THEN
1117: r>
1118: r> >in ! r> #tib ! r> >tib ! r> tibstack ! r> blk !
1119: r> loadfile ! r> loadline ! >r ;
1120:
1121: : read-loop ( i*x -- j*x )
1122: BEGIN refill WHILE interpret REPEAT ;
1123:
1124: : include-file ( i*x fid -- j*x ) \ file
1125: push-file loadfile !
1126: 0 loadline ! blk off ['] read-loop catch
1127: loadfile @ close-file swap 2dup or
1128: pop-file drop throw throw ;
1129:
1130: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
1131:
1132: \ : check-file-prefix ( addr len -- addr' len' flag )
1133: \ dup 0= IF true EXIT THEN
1134: \ over c@ '/ = IF true EXIT THEN
1135: \ over 2 S" ./" compare 0= IF true EXIT THEN
1136: \ over 3 S" ../" compare 0= IF true EXIT THEN
1137: \ over 2 S" ~/" compare 0=
1138: \ IF 1 /string
1139: \ S" HOME" getenv tuck pathfilenamebuf swap move
1140: \ 2dup + >r pathfilenamebuf + swap move
1141: \ pathfilenamebuf r> true
1142: \ ELSE false
1143: \ THEN ;
1144:
1145: : absolut-path? ( addr u -- flag ) \ gforth
1146: \G a path is absolute, if it starts with a / or a ~ (~ expansion),
1147: \G or if it is in the form ./* or ../*, extended regexp: ^[/~]|./|../
1148: \G Pathes simply containing a / are not absolute!
1149: over c@ '/ = >r
1150: over c@ '~ = >r
1151: 2dup 2 min S" ./" compare 0= >r
1152: 3 min S" ../" compare 0=
1153: r> r> r> or or or ;
1154: \ [char] / scan nip 0<> ;
1155:
1156: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
1157: \G opens a file for reading, searching in the path for it (unless
1158: \G the filename contains a slash); c-addr2 u2 is the full filename
1159: \G (valid until the next call); if the file is not found (or in
1160: \G case of other errors for each try), -38 (non-existant file) is
1161: \G thrown. Opening for other access modes makes little sense, as
1162: \G the path will usually contain dirs that are only readable for
1163: \G the user
1164: \ !! use file-status to determine access mode?
1165: 2dup absolut-path?
1166: if \ the filename contains a slash
1167: 2dup r/o open-file throw ( c-addr1 u1 file-id )
1168: -rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
1169: pathfilenamebuf r> EXIT
1170: then
1171: pathdirs 2@ 0
1172: \ check-file-prefix 0=
1173: \ IF pathdirs 2@ 0
1174: ?DO ( c-addr1 u1 dirnamep )
1175: dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
1176: 2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
1177: pathfilenamebuf over r> + dup >r r/o open-file 0=
1178: IF ( addr u file-id )
1179: nip nip r> rdrop 0 LEAVE
1180: THEN
1181: rdrop drop r> cell+ cell+
1182: LOOP
1183: \ ELSE 2dup open-file throw -rot THEN
1184: 0<> -&38 and throw ( file-id u2 )
1185: pathfilenamebuf swap ;
1186:
1187: create included-files 0 , 0 , ( pointer to and count of included files )
1188: here ," the terminal" dup c@ swap 1 + swap , A, here 2 cells -
1189: create image-included-files 1 , A, ( pointer to and count of included files )
1190: \ included-files points to ALLOCATEd space, while image-included-files
1191: \ points to ALLOTed objects, so it survives a save-system
1192:
1193: : loadfilename ( -- a-addr )
1194: \G a-addr 2@ produces the current file name ( c-addr u )
1195: included-files 2@ drop loadfilename# @ 2* cells + ;
1196:
1197: : sourcefilename ( -- c-addr u ) \ gforth
1198: \G the name of the source file which is currently the input
1199: \G source. The result is valid only while the file is being
1200: \G loaded. If the current input source is no (stream) file, the
1201: \G result is undefined.
1202: loadfilename 2@ ;
1203:
1204: : sourceline# ( -- u ) \ gforth sourceline-number
1205: \G the line number of the line that is currently being interpreted
1206: \G from a (stream) file. The first line has the number 1. If the
1207: \G current input source is no (stream) file, the result is
1208: \G undefined.
1209: loadline @ ;
1210:
1211: : init-included-files ( -- )
1212: image-included-files 2@ 2* cells save-mem drop ( addr )
1213: image-included-files 2@ nip included-files 2! ;
1214:
1215: : included? ( c-addr u -- f ) \ gforth
1216: \G true, iff filename c-addr u is in included-files
1217: included-files 2@ 0
1218: ?do ( c-addr u addr )
1219: dup >r 2@ 2over compare 0=
1220: if
1221: 2drop rdrop unloop
1222: true EXIT
1223: then
1224: r> cell+ cell+
1225: loop
1226: 2drop drop false ;
1227:
1228: : add-included-file ( c-addr u -- ) \ gforth
1229: \G add name c-addr u to included-files
1230: included-files 2@ 2* cells 2 cells extend-mem
1231: 2/ cell / included-files 2!
1232: 2! ;
1233: \ included-files 2@ tuck 1+ 2* cells resize throw
1234: \ swap 2dup 1+ included-files 2!
1235: \ 2* cells + 2! ;
1236:
1237: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1238: \G include the file file-id with the name given by c-addr u
1239: loadfilename# @ >r
1240: save-mem add-included-file ( file-id )
1241: included-files 2@ nip 1- loadfilename# !
1242: ['] include-file catch
1243: r> loadfilename# !
1244: throw ;
1245:
1246: : included ( i*x addr u -- j*x ) \ file
1247: open-path-file included1 ;
1248:
1249: : required ( i*x addr u -- j*x ) \ gforth
1250: \G include the file with the name given by addr u, if it is not
1251: \G included already. Currently this works by comparing the name of
1252: \G the file (with path) against the names of earlier included
1253: \G files; however, it would probably be better to fstat the file,
1254: \G and compare the device and inode. The advantages would be: no
1255: \G problems with several paths to the same file (e.g., due to
1256: \G links) and we would catch files included with include-file and
1257: \G write a require-file.
1258: open-path-file 2dup included?
1259: if
1260: 2drop close-file throw
1261: else
1262: included1
1263: then ;
1264:
1265: \ HEX DECIMAL 2may93jaw
1266:
1267: : decimal ( -- ) \ core
1268: a base ! ;
1269: : hex ( -- ) \ core-ext
1270: 10 base ! ;
1271:
1272: \ DEPTH 9may93jaw
1273:
1274: : depth ( -- +n ) \ core
1275: sp@ s0 @ swap - cell / ;
1276: : clearstack ( ... -- )
1277: s0 @ sp! ;
1278:
1279: \ INCLUDE 9may93jaw
1280:
1281: : include ( "file" -- ) \ gforth
1282: name included ;
1283:
1284: : require ( "file" -- ) \ gforth
1285: name required ;
1286:
1287: \ RECURSE 17may93jaw
1288:
1289: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1290: lastxt compile, ; immediate restrict
1291: ' reveal alias recursive ( -- ) \ gforth
1292: immediate
1293:
1294: \ */MOD */ 17may93jaw
1295:
1296: \ !! I think */mod should have the same rounding behaviour as / - anton
1297: : */mod ( n1 n2 n3 -- n4 n5 ) \ core star-slash-mod
1298: >r m* r> sm/rem ;
1299:
1300: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
1301: */mod nip ;
1302:
1303: \ EVALUATE 17may93jaw
1304:
1305: : evaluate ( c-addr len -- ) \ core,block
1306: push-file #tib ! >tib !
1307: >in off blk off loadfile off -1 loadline !
1308: ['] interpret catch
1309: pop-file throw ;
1310:
1311: : abort ( ?? -- ?? ) \ core,exception-ext
1312: -1 throw ;
1313:
1314: \+ environment? true ENV" CORE"
1315: \ core wordset is now complete!
1316:
1317: \ Quit 13feb93py
1318:
1319: Defer 'quit
1320: Defer .status
1321: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
1322: : (Query) ( -- )
1323: loadfile off blk off refill drop ;
1324: : (quit) BEGIN .status cr (query) interpret prompt AGAIN ;
1325: ' (quit) IS 'quit
1326:
1327: \ DOERROR (DOERROR) 13jun93jaw
1328:
1329: 8 Constant max-errors
1330: Variable error-stack 0 error-stack !
1331: max-errors 6 * cells allot
1332: \ format of one cell:
1333: \ source ( addr u )
1334: \ >in
1335: \ line-number
1336: \ Loadfilename ( addr u )
1337:
1338: : dec. ( n -- ) \ gforth
1339: \ print value in decimal representation
1340: base @ decimal swap . base ! ;
1341:
1342: : hex. ( u -- ) \ gforth
1343: \ print value as unsigned hex number
1344: '$ emit base @ swap hex u. base ! ;
1345:
1346: : typewhite ( addr u -- ) \ gforth
1347: \ like type, but white space is printed instead of the characters
1348: bounds ?do
1349: i c@ #tab = if \ check for tab
1350: #tab
1351: else
1352: bl
1353: then
1354: emit
1355: loop ;
1356:
1357: DEFER DOERROR
1358:
1359: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
1360: cr error-stack @
1361: IF
1362: ." in file included from "
1363: type ." :" dec. drop 2drop
1364: ELSE
1365: type ." :" dec.
1366: cr dup 2over type cr drop
1367: nip -trailing 1- ( line-start index2 )
1368: 0 >r BEGIN
1369: 2dup + c@ bl > WHILE
1370: r> 1+ >r 1- dup 0< UNTIL THEN 1+
1371: ( line-start index1 )
1372: typewhite
1373: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
1374: [char] ^ emit
1375: loop
1376: THEN
1377: ;
1378:
1379: : (DoError) ( throw-code -- )
1380: sourceline# IF
1381: source >in @ sourceline# 0 0 .error-frame
1382: THEN
1383: error-stack @ 0 ?DO
1384: -1 error-stack +!
1385: error-stack dup @ 6 * cells + cell+
1386: 6 cells bounds DO
1387: I @
1388: cell +LOOP
1389: .error-frame
1390: LOOP
1391: dup -2 =
1392: IF
1393: "error @ ?dup
1394: IF
1395: cr count type
1396: THEN
1397: drop
1398: ELSE
1399: .error
1400: THEN
1401: normal-dp dpp ! ;
1402:
1403: ' (DoError) IS DoError
1404:
1405: : quit ( ?? -- ?? ) \ core
1406: r0 @ rp! handler off >tib @ >r
1407: BEGIN
1408: postpone [
1409: ['] 'quit CATCH dup
1410: WHILE
1411: DoError r@ >tib ! r@ tibstack !
1412: REPEAT
1413: drop r> >tib ! ;
1414:
1415: \ Cold 13feb93py
1416:
1417: \ : .name ( name -- ) name>string type space ;
1418: \ : words listwords @
1419: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
1420:
1421: : cstring>sstring ( cstring -- addr n ) \ gforth cstring-to-sstring
1422: -1 0 scan 0 swap 1+ /string ;
1423: : arg ( n -- addr count ) \ gforth
1424: cells argv @ + @ cstring>sstring ;
1425: : #! postpone \ ; immediate
1426:
1427: Create pathstring 2 cells allot \ string
1428: Create pathdirs 2 cells allot \ dir string array, pointer and count
1429: Variable argv
1430: Variable argc
1431:
1432: 0 Value script? ( -- flag )
1433:
1434: : process-path ( addr1 u1 -- addr2 u2 )
1435: \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
1436: align here >r
1437: BEGIN
1438: over >r 0 scan
1439: over r> tuck - ( rest-str this-str )
1440: dup
1441: IF
1442: 2dup 1- chars + c@ [char] / <>
1443: IF
1444: 2dup chars + [char] / swap c!
1445: 1+
1446: THEN
1447: 2,
1448: ELSE
1449: 2drop
1450: THEN
1451: dup
1452: WHILE
1453: 1 /string
1454: REPEAT
1455: 2drop
1456: here r> tuck - 2 cells / ;
1457:
1458: : do-option ( addr1 len1 addr2 len2 -- n )
1459: 2swap
1460: 2dup s" -e" compare 0= >r
1461: 2dup s" --evaluate" compare 0= r> or
1462: IF 2drop dup >r ['] evaluate catch
1463: ?dup IF dup >r DoError r> negate (bye) THEN
1464: r> >tib +! 2 EXIT THEN
1465: ." Unknown option: " type cr 2drop 1 ;
1466:
1467: : process-args ( -- )
1468: >tib @ >r
1469: argc @ 1
1470: ?DO
1471: I arg over c@ [char] - <>
1472: IF
1473: required 1
1474: ELSE
1475: I 1+ argc @ = IF s" " ELSE I 1+ arg THEN
1476: do-option
1477: THEN
1478: +LOOP
1479: r> >tib ! ;
1480:
1481: Defer 'cold ' noop IS 'cold
1482:
1483: : cold ( -- ) \ gforth
1484: stdout TO outfile-id
1485: pathstring 2@ process-path pathdirs 2!
1486: init-included-files
1487: 'cold
1488: argc @ 1 >
1489: IF
1490: true to script?
1491: ['] process-args catch ?dup
1492: IF
1493: dup >r DoError cr r> negate (bye)
1494: THEN
1495: cr
1496: THEN
1497: false to script?
1498: ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
1499: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
1500: ." Type `bye' to exit"
1501: loadline off quit ;
1502:
1503: : license ( -- ) \ gforth
1504: cr
1505: ." This program is free software; you can redistribute it and/or modify" cr
1506: ." it under the terms of the GNU General Public License as published by" cr
1507: ." the Free Software Foundation; either version 2 of the License, or" cr
1508: ." (at your option) any later version." cr cr
1509:
1510: ." This program is distributed in the hope that it will be useful," cr
1511: ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
1512: ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" cr
1513: ." GNU General Public License for more details." cr cr
1514:
1515: ." You should have received a copy of the GNU General Public License" cr
1516: ." along with this program; if not, write to the Free Software" cr
1517: ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
1518:
1519: : boot ( path **argv argc -- )
1520: argc ! argv ! pathstring 2! main-task up!
1521: sp@ s0 !
1522: lp@ forthstart 7 cells + @ - dup >tib ! tibstack ! #tib off >in off
1523: rp@ r0 !
1524: fp@ f0 !
1525: ['] cold catch DoError
1526: bye ;
1527:
1528: : bye ( -- ) \ tools-ext
1529: script? 0= IF cr THEN 0 (bye) ;
1530:
1531: \ **argv may be scanned by the C starter to get some important
1532: \ information, as -display and -geometry for an X client FORTH
1533: \ or space and stackspace overrides
1534:
1535: \ 0 arg contains, however, the name of the program.
1536:
1537:
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