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: \ 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 -- cfa )
164: name>string + cfaligned ;
165:
166: : (name>x) ( nfa -- cfa b )
167: \ cfa is an intermediate cfa and b is the flags byte of nfa
168: dup ((name>))
169: swap cell+ c@ dup alias-mask and 0=
170: IF
171: swap @ swap
172: THEN ;
173:
174: \ place bounds 13feb93py
175:
176: : place ( addr len to -- ) \ gforth
177: over >r rot over 1+ r> move c! ;
178: : bounds ( beg count -- end beg ) \ gforth
179: over + swap ;
180:
181: : save-mem ( addr1 u -- addr2 u ) \ gforth
182: \ copy a memory block into a newly allocated region in the heap
183: swap >r
184: dup allocate throw
185: swap 2dup r> -rot move ;
186:
187: : extend-mem ( addr1 u1 u -- addr addr2 u2 )
188: \ extend memory block allocated from the heap by u aus
189: \ the (possibly reallocated piece is addr2 u2, the extension is at addr
190: over >r + dup >r resize throw
191: r> over r> + -rot ;
192:
193: \ input stream primitives 23feb93py
194:
195: : tib ( -- c-addr ) \ core-ext
196: \ obsolescent
197: >tib @ ;
198: Defer source ( -- addr count ) \ core
199: \ used by dodefer:, must be defer
200: : (source) ( -- addr count )
201: tib #tib @ ;
202: ' (source) IS source
203:
204: \ (word) 22feb93py
205:
206: : scan ( addr1 n1 char -- addr2 n2 ) \ gforth
207: \ skip all characters not equal to char
208: >r
209: BEGIN
210: dup
211: WHILE
212: over c@ r@ <>
213: WHILE
214: 1 /string
215: REPEAT THEN
216: rdrop ;
217: : skip ( addr1 n1 char -- addr2 n2 ) \ gforth
218: \ skip all characters equal to char
219: >r
220: BEGIN
221: dup
222: WHILE
223: over c@ r@ =
224: WHILE
225: 1 /string
226: REPEAT THEN
227: rdrop ;
228:
229: : (word) ( addr1 n1 char -- addr2 n2 )
230: dup >r skip 2dup r> scan nip - ;
231:
232: \ (word) should fold white spaces
233: \ this is what (parse-white) does
234:
235: \ word parse 23feb93py
236:
237: : parse-word ( char -- addr len ) \ gforth
238: source 2dup >r >r >in @ over min /string
239: rot dup bl = IF drop (parse-white) ELSE (word) THEN
240: 2dup + r> - 1+ r> min >in ! ;
241: : word ( char -- addr ) \ core
242: parse-word here place bl here count + c! here ;
243:
244: : parse ( char -- addr len ) \ core-ext
245: >r source >in @ over min /string over swap r> scan >r
246: over - dup r> IF 1+ THEN >in +! ;
247:
248: \ name 13feb93py
249:
250: : capitalize ( addr len -- addr len ) \ gforth
251: 2dup chars chars bounds
252: ?DO I c@ toupper I c! 1 chars +LOOP ;
253: : (name) ( -- c-addr count )
254: source 2dup >r >r >in @ /string (parse-white)
255: 2dup + r> - 1+ r> min >in ! ;
256: \ name count ;
257:
258: : name-too-short? ( c-addr u -- c-addr u )
259: dup 0= -&16 and throw ;
260:
261: : name-too-long? ( c-addr u -- c-addr u )
262: dup $1F u> -&19 and throw ;
263:
264: \ Literal 17dec92py
265:
266: : Literal ( compilation n -- ; run-time -- n ) \ core
267: postpone lit , ; immediate restrict
268: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
269: postpone lit A, ; immediate restrict
270:
271: : char ( 'char' -- n ) \ core
272: bl word char+ c@ ;
273: : [char] ( compilation 'char' -- ; run-time -- n )
274: char postpone Literal ; immediate restrict
275:
276: : (compile) ( -- ) \ gforth
277: r> dup cell+ >r @ compile, ;
278:
279: \ not the most efficient implementation of POSTPONE, but simple
280: : POSTPONE ( -- ) \ core
281: COMP' swap POSTPONE aliteral compile, ; immediate restrict
282:
283: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
284: Create immediate swap A, A,
285: DOES>
286: abort" executed primary cfa of an interpret/compile: word" ;
287: \ state @ IF cell+ THEN perform ;
288:
289: \ Use (compile) for the old behavior of compile!
290:
291: \ digit? 17dec92py
292:
293: : digit? ( char -- digit true/ false ) \ gforth
294: base @ $100 =
295: IF
296: true EXIT
297: THEN
298: toupper [char] 0 - dup 9 u> IF
299: [ 'A '9 1 + - ] literal -
300: dup 9 u<= IF
301: drop false EXIT
302: THEN
303: THEN
304: dup base @ u>= IF
305: drop false EXIT
306: THEN
307: true ;
308:
309: : accumulate ( +d0 addr digit - +d1 addr )
310: swap >r swap base @ um* drop rot base @ um* d+ r> ;
311:
312: : >number ( d addr count -- d addr count ) \ core
313: 0
314: ?DO
315: count digit?
316: WHILE
317: accumulate
318: LOOP
319: 0
320: ELSE
321: 1- I' I -
322: UNLOOP
323: THEN ;
324:
325: \ number? number 23feb93py
326:
327: Create bases 10 , 2 , A , 100 ,
328: \ 16 2 10 Zeichen
329: \ !! this saving and restoring base is an abomination! - anton
330: : getbase ( addr u -- addr' u' )
331: over c@ [char] $ - dup 4 u<
332: IF
333: cells bases + @ base ! 1 /string
334: ELSE
335: drop
336: THEN ;
337: : s>number ( addr len -- d )
338: base @ >r dpl on
339: over c@ '- = dup >r
340: IF
341: 1 /string
342: THEN
343: getbase dpl on 0 0 2swap
344: BEGIN
345: dup >r >number dup
346: WHILE
347: dup r> -
348: WHILE
349: dup dpl ! over c@ [char] . =
350: WHILE
351: 1 /string
352: REPEAT THEN
353: 2drop rdrop dpl off
354: ELSE
355: 2drop rdrop r>
356: IF
357: dnegate
358: THEN
359: THEN
360: r> base ! ;
361:
362: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
363: s>number dpl @ 0=
364: IF
365: 2drop false EXIT
366: THEN
367: dpl @ dup 0> 0= IF
368: nip
369: THEN ;
370: : number? ( string -- string 0 / n -1 / d 0> )
371: dup >r count snumber? dup if
372: rdrop
373: else
374: r> swap
375: then ;
376: : s>d ( n -- d ) \ core s-to-d
377: dup 0< ;
378: : number ( string -- d )
379: number? ?dup 0= abort" ?" 0<
380: IF
381: s>d
382: THEN ;
383:
384: \ space spaces ud/mod 21mar93py
385: decimal
386: Create spaces ( u -- ) \ core
387: bl 80 times \ times from target compiler! 11may93jaw
388: DOES> ( u -- )
389: swap
390: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
391: Create backspaces
392: 08 80 times \ times from target compiler! 11may93jaw
393: DOES> ( u -- )
394: swap
395: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
396: hex
397: : space ( -- ) \ core
398: 1 spaces ;
399:
400: : ud/mod ( ud1 u2 -- urem udquot ) \ gforth
401: >r 0 r@ um/mod r> swap >r
402: um/mod r> ;
403:
404: : pad ( -- addr ) \ core-ext
405: here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
406:
407: \ hold <# #> sign # #s 25jan92py
408:
409: : hold ( char -- ) \ core
410: pad cell - -1 chars over +! @ c! ;
411:
412: : <# ( -- ) \ core less-number-sign
413: pad cell - dup ! ;
414:
415: : #> ( xd -- addr u ) \ core number-sign-greater
416: 2drop pad cell - dup @ tuck - ;
417:
418: : sign ( n -- ) \ core
419: 0< IF [char] - hold THEN ;
420:
421: : # ( ud1 -- ud2 ) \ core number-sign
422: base @ 2 max ud/mod rot 9 over <
423: IF
424: [ char A char 9 - 1- ] Literal +
425: THEN
426: [char] 0 + hold ;
427:
428: : #s ( +d -- 0 0 ) \ core number-sign-s
429: BEGIN
430: # 2dup d0=
431: UNTIL ;
432:
433: \ print numbers 07jun92py
434:
435: : d.r ( d n -- ) \ double d-dot-r
436: >r tuck dabs <# #s rot sign #>
437: r> over - spaces type ;
438:
439: : ud.r ( ud n -- ) \ gforth u-d-dot-r
440: >r <# #s #> r> over - spaces type ;
441:
442: : .r ( n1 n2 -- ) \ core-ext dot-r
443: >r s>d r> d.r ;
444: : u.r ( u n -- ) \ core-ext u-dot-r
445: 0 swap ud.r ;
446:
447: : d. ( d -- ) \ double d-dot
448: 0 d.r space ;
449: : ud. ( ud -- ) \ gforth u-d-dot
450: 0 ud.r space ;
451:
452: : . ( n -- ) \ core dot
453: s>d d. ;
454: : u. ( u -- ) \ core u-dot
455: 0 ud. ;
456:
457: \ catch throw 23feb93py
458: \ bounce 08jun93jaw
459:
460: \ !! allow the user to add rollback actions anton
461: \ !! use a separate exception stack? anton
462:
463: : lp@ ( -- addr ) \ gforth l-p-fetch
464: laddr# [ 0 , ] ;
465:
466: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception
467: >r sp@ r> swap >r \ don't count xt! jaw
468: fp@ >r
469: lp@ >r
470: handler @ >r
471: rp@ handler !
472: execute
473: r> handler ! rdrop rdrop rdrop 0 ;
474:
475: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
476: ?DUP IF
477: [ here 9 cells ! ]
478: handler @ rp!
479: r> handler !
480: r> lp!
481: r> fp!
482: r> swap >r sp! r>
483: THEN ;
484:
485: \ Bouncing is very fine,
486: \ programming without wasting time... jaw
487: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
488: \ a throw without data or fp stack restauration
489: ?DUP IF
490: handler @ rp!
491: r> handler !
492: r> lp!
493: rdrop
494: rdrop
495: THEN ;
496:
497: \ ?stack 23feb93py
498:
499: : ?stack ( ?? -- ?? ) \ gforth
500: sp@ s0 @ > IF -4 throw THEN
501: fp@ f0 @ > IF -&45 throw THEN ;
502: \ ?stack should be code -- it touches an empty stack!
503:
504: \ interpret 10mar92py
505:
506: Defer parser
507: Defer name ( -- c-addr count ) \ gforth
508: \ get the next word from the input buffer
509: ' (name) IS name
510: Defer compiler-notfound ( c-addr count -- )
511: Defer interpreter-notfound ( c-addr count -- )
512:
513: : no.extensions ( addr u -- )
514: 2drop -&13 bounce ;
515: ' no.extensions IS compiler-notfound
516: ' no.extensions IS interpreter-notfound
517:
518: : compile-only-error ( ... -- )
519: -&14 throw ;
520:
521: : interpret ( ?? -- ?? ) \ gforth
522: \ interpret/compile the (rest of the) input buffer
523: BEGIN
524: ?stack name dup
525: WHILE
526: parser
527: REPEAT
528: 2drop ;
529:
530: \ interpreter compiler 30apr92py
531:
532: \ not the most efficient implementations of interpreter and compiler
533: : interpreter ( c-addr u -- )
534: 2dup find-name dup
535: if
536: nip nip name>int execute
537: else
538: drop
539: 2dup 2>r snumber?
540: IF
541: 2rdrop
542: ELSE
543: 2r> interpreter-notfound
544: THEN
545: then ;
546:
547: : compiler ( c-addr u -- )
548: 2dup find-name dup
549: if ( c-addr u nfa )
550: nip nip name>comp execute
551: else
552: drop
553: 2dup snumber? dup
554: IF
555: 0>
556: IF
557: swap postpone Literal
558: THEN
559: postpone Literal
560: 2drop
561: ELSE
562: drop compiler-notfound
563: THEN
564: then ;
565:
566: ' interpreter IS parser
567:
568: : [ ( -- ) \ core left-bracket
569: ['] interpreter IS parser state off ; immediate
570: : ] ( -- ) \ core right-bracket
571: ['] compiler IS parser state on ;
572:
573: \ locals stuff needed for control structures
574:
575: : compile-lp+! ( n -- ) \ gforth compile-l-p-plus-store
576: dup negate locals-size +!
577: 0 over = if
578: else -1 cells over = if postpone lp-
579: else 1 floats over = if postpone lp+
580: else 2 floats over = if postpone lp+2
581: else postpone lp+!# dup ,
582: then then then then drop ;
583:
584: : adjust-locals-size ( n -- ) \ gforth
585: \ sets locals-size to n and generates an appropriate lp+!
586: locals-size @ swap - compile-lp+! ;
587:
588:
589: here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs
590: AConstant locals-list \ acts like a variable that contains
591: \ a linear list of locals names
592:
593:
594: variable dead-code \ true if normal code at "here" would be dead
595: variable backedge-locals
596: \ contains the locals list that BEGIN will assume to be live on
597: \ the back edge if the BEGIN is unreachable from above. Set by
598: \ ASSUME-LIVE, reset by UNREACHABLE.
599:
600: : UNREACHABLE ( -- ) \ gforth
601: \ declares the current point of execution as unreachable
602: dead-code on
603: 0 backedge-locals ! ; immediate
604:
605: : ASSUME-LIVE ( orig -- orig ) \ gforth
606: \ used immediatly before a BEGIN that is not reachable from
607: \ above. causes the BEGIN to assume that the same locals are live
608: \ as at the orig point
609: dup orig?
610: 2 pick backedge-locals ! ; immediate
611:
612: \ locals list operations
613:
614: : common-list ( list1 list2 -- list3 ) \ gforth-internal
615: \ list1 and list2 are lists, where the heads are at higher addresses than
616: \ the tail. list3 is the largest sublist of both lists.
617: begin
618: 2dup u<>
619: while
620: 2dup u>
621: if
622: swap
623: then
624: @
625: repeat
626: drop ;
627:
628: : sub-list? ( list1 list2 -- f ) \ gforth-internal
629: \ true iff list1 is a sublist of list2
630: begin
631: 2dup u<
632: while
633: @
634: repeat
635: = ;
636:
637: : list-size ( list -- u ) \ gforth-internal
638: \ size of the locals frame represented by list
639: 0 ( list n )
640: begin
641: over 0<>
642: while
643: over
644: ((name>)) >body @ max
645: swap @ swap ( get next )
646: repeat
647: faligned nip ;
648:
649: : set-locals-size-list ( list -- )
650: dup locals-list !
651: list-size locals-size ! ;
652:
653: : check-begin ( list -- )
654: \ warn if list is not a sublist of locals-list
655: locals-list @ sub-list? 0= if
656: \ !! print current position
657: ." compiler was overly optimistic about locals at a BEGIN" cr
658: \ !! print assumption and reality
659: then ;
660:
661: \ Control Flow Stack
662: \ orig, etc. have the following structure:
663: \ type ( defstart, live-orig, dead-orig, dest, do-dest, scopestart) ( TOS )
664: \ address (of the branch or the instruction to be branched to) (second)
665: \ locals-list (valid at address) (third)
666:
667: \ types
668: 0 constant defstart
669: 1 constant live-orig
670: 2 constant dead-orig
671: 3 constant dest \ the loopback branch is always assumed live
672: 4 constant do-dest
673: 5 constant scopestart
674:
675: : def? ( n -- )
676: defstart <> abort" unstructured " ;
677:
678: : orig? ( n -- )
679: dup live-orig <> swap dead-orig <> and abort" expected orig " ;
680:
681: : dest? ( n -- )
682: dest <> abort" expected dest " ;
683:
684: : do-dest? ( n -- )
685: do-dest <> abort" expected do-dest " ;
686:
687: : scope? ( n -- )
688: scopestart <> abort" expected scope " ;
689:
690: : non-orig? ( n -- )
691: dest scopestart 1+ within 0= abort" expected dest, do-dest or scope" ;
692:
693: : cs-item? ( n -- )
694: live-orig scopestart 1+ within 0= abort" expected control flow stack item" ;
695:
696: 3 constant cs-item-size
697:
698: : CS-PICK ( ... u -- ... destu ) \ tools-ext
699: 1+ cs-item-size * 1- >r
700: r@ pick r@ pick r@ pick
701: rdrop
702: dup non-orig? ;
703:
704: : CS-ROLL ( destu/origu .. dest0/orig0 u -- .. dest0/orig0 destu/origu ) \ tools-ext
705: 1+ cs-item-size * 1- >r
706: r@ roll r@ roll r@ roll
707: rdrop
708: dup cs-item? ;
709:
710: : cs-push-part ( -- list addr )
711: locals-list @ here ;
712:
713: : cs-push-orig ( -- orig )
714: cs-push-part dead-code @
715: if
716: dead-orig
717: else
718: live-orig
719: then ;
720:
721: \ Structural Conditionals 12dec92py
722:
723: : ?struc ( flag -- ) abort" unstructured " ;
724: : sys? ( sys -- ) dup 0= ?struc ;
725: : >mark ( -- orig )
726: cs-push-orig 0 , ;
727: : >resolve ( addr -- ) here over - swap ! ;
728: : <resolve ( addr -- ) here - , ;
729:
730: : BUT
731: 1 cs-roll ; immediate restrict
732: : YET
733: 0 cs-pick ; immediate restrict
734:
735: \ Structural Conditionals 12dec92py
736:
737: : AHEAD ( compilation -- orig ; run-time -- ) \ tools-ext
738: POSTPONE branch >mark POSTPONE unreachable ; immediate restrict
739:
740: : IF ( compilation -- orig ; run-time f -- ) \ core
741: POSTPONE ?branch >mark ; immediate restrict
742:
743: : ?DUP-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-if
744: \ This is the preferred alternative to the idiom "?DUP IF", since it can be
745: \ better handled by tools like stack checkers. Besides, it's faster.
746: POSTPONE ?dup-?branch >mark ; immediate restrict
747:
748: : ?DUP-0=-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-zero-equals-if
749: POSTPONE ?dup-0=-?branch >mark ; immediate restrict
750:
751: : then-like ( orig -- addr )
752: swap -rot dead-orig =
753: if
754: drop
755: else
756: dead-code @
757: if
758: set-locals-size-list dead-code off
759: else \ both live
760: dup list-size adjust-locals-size
761: locals-list @ common-list dup list-size adjust-locals-size
762: locals-list !
763: then
764: then ;
765:
766: : THEN ( compilation orig -- ; run-time -- ) \ core
767: dup orig? then-like >resolve ; immediate restrict
768:
769: ' THEN alias ENDIF ( compilation orig -- ; run-time -- ) \ gforth
770: immediate restrict
771: \ Same as "THEN". This is what you use if your program will be seen by
772: \ people who have not been brought up with Forth (or who have been
773: \ brought up with fig-Forth).
774:
775: : ELSE ( compilation orig1 -- orig2 ; run-time f -- ) \ core
776: POSTPONE ahead
777: 1 cs-roll
778: POSTPONE then ; immediate restrict
779:
780:
781: : BEGIN ( compilation -- dest ; run-time -- ) \ core
782: dead-code @ if
783: \ set up an assumption of the locals visible here. if the
784: \ users want something to be visible, they have to declare
785: \ that using ASSUME-LIVE
786: backedge-locals @ set-locals-size-list
787: then
788: cs-push-part dest
789: dead-code off ; immediate restrict
790:
791: \ AGAIN (the current control flow joins another, earlier one):
792: \ If the dest-locals-list is not a subset of the current locals-list,
793: \ issue a warning (see below). The following code is generated:
794: \ lp+!# (current-local-size - dest-locals-size)
795: \ branch <begin>
796:
797: : again-like ( dest -- addr )
798: over list-size adjust-locals-size
799: swap check-begin POSTPONE unreachable ;
800:
801: : AGAIN ( compilation dest -- ; run-time -- ) \ core-ext
802: dest? again-like POSTPONE branch <resolve ; immediate restrict
803:
804: \ UNTIL (the current control flow may join an earlier one or continue):
805: \ Similar to AGAIN. The new locals-list and locals-size are the current
806: \ ones. The following code is generated:
807: \ ?branch-lp+!# <begin> (current-local-size - dest-locals-size)
808: : until-like ( list addr xt1 xt2 -- )
809: \ list and addr are a fragment of a cs-item
810: \ xt1 is the conditional branch without lp adjustment, xt2 is with
811: >r >r
812: locals-size @ 2 pick list-size - dup if ( list dest-addr adjustment )
813: r> drop r> compile,
814: swap <resolve ( list adjustment ) ,
815: else ( list dest-addr adjustment )
816: drop
817: r> compile, <resolve
818: r> drop
819: then ( list )
820: check-begin ;
821:
822: : UNTIL ( compilation dest -- ; run-time f -- ) \ core
823: dest? ['] ?branch ['] ?branch-lp+!# until-like ; immediate restrict
824:
825: : WHILE ( compilation dest -- orig dest ; run-time f -- ) \ core
826: POSTPONE if
827: 1 cs-roll ; immediate restrict
828:
829: : REPEAT ( compilation orig dest -- ; run-time -- ) \ core
830: POSTPONE again
831: POSTPONE then ; immediate restrict
832:
833:
834: \ counted loops
835:
836: \ leave poses a little problem here
837: \ we have to store more than just the address of the branch, so the
838: \ traditional linked list approach is no longer viable.
839: \ This is solved by storing the information about the leavings in a
840: \ special stack.
841:
842: \ !! remove the fixed size limit. 'Tis not hard.
843: 20 constant leave-stack-size
844: create leave-stack 60 cells allot
845: Avariable leave-sp leave-stack 3 cells + leave-sp !
846:
847: : clear-leave-stack ( -- )
848: leave-stack leave-sp ! ;
849:
850: \ : leave-empty? ( -- f )
851: \ leave-sp @ leave-stack = ;
852:
853: : >leave ( orig -- )
854: \ push on leave-stack
855: leave-sp @
856: dup [ leave-stack 60 cells + ] Aliteral
857: >= abort" leave-stack full"
858: tuck ! cell+
859: tuck ! cell+
860: tuck ! cell+
861: leave-sp ! ;
862:
863: : leave> ( -- orig )
864: \ pop from leave-stack
865: leave-sp @
866: dup leave-stack <= IF
867: drop 0 0 0 EXIT THEN
868: cell - dup @ swap
869: cell - dup @ swap
870: cell - dup @ swap
871: leave-sp ! ;
872:
873: : DONE ( compilation orig -- ; run-time -- ) \ gforth
874: \ !! the original done had ( addr -- )
875: drop >r drop
876: begin
877: leave>
878: over r@ u>=
879: while
880: POSTPONE then
881: repeat
882: >leave rdrop ; immediate restrict
883:
884: : LEAVE ( compilation -- ; run-time loop-sys -- ) \ core
885: POSTPONE ahead
886: >leave ; immediate restrict
887:
888: : ?LEAVE ( compilation -- ; run-time f | f loop-sys -- ) \ gforth question-leave
889: POSTPONE 0= POSTPONE if
890: >leave ; immediate restrict
891:
892: : DO ( compilation -- do-sys ; run-time w1 w2 -- loop-sys ) \ core
893: POSTPONE (do)
894: POSTPONE begin drop do-dest
895: ( 0 0 0 >leave ) ; immediate restrict
896:
897: : ?do-like ( -- do-sys )
898: ( 0 0 0 >leave )
899: >mark >leave
900: POSTPONE begin drop do-dest ;
901:
902: : ?DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ core-ext question-do
903: POSTPONE (?do) ?do-like ; immediate restrict
904:
905: : +DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys ) \ gforth plus-do
906: POSTPONE (+do) ?do-like ; immediate restrict
907:
908: : U+DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys ) \ gforth u-plus-do
909: POSTPONE (u+do) ?do-like ; immediate restrict
910:
911: : -DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys ) \ gforth minus-do
912: POSTPONE (-do) ?do-like ; immediate restrict
913:
914: : U-DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys ) \ gforth u-minus-do
915: POSTPONE (u-do) ?do-like ; immediate restrict
916:
917: : FOR ( compilation -- do-sys ; run-time u -- loop-sys ) \ gforth
918: POSTPONE (for)
919: POSTPONE begin drop do-dest
920: ( 0 0 0 >leave ) ; immediate restrict
921:
922: \ LOOP etc. are just like UNTIL
923:
924: : loop-like ( do-sys xt1 xt2 -- )
925: >r >r 0 cs-pick swap cell - swap 1 cs-roll r> r> rot do-dest?
926: until-like POSTPONE done POSTPONE unloop ;
927:
928: : LOOP ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ core
929: ['] (loop) ['] (loop)-lp+!# loop-like ; immediate restrict
930:
931: : +LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ core plus-loop
932: ['] (+loop) ['] (+loop)-lp+!# loop-like ; immediate restrict
933:
934: \ !! should the compiler warn about +DO..-LOOP?
935: : -LOOP ( compilation do-sys -- ; run-time loop-sys1 u -- | loop-sys2 ) \ gforth minus-loop
936: ['] (-loop) ['] (-loop)-lp+!# loop-like ; immediate restrict
937:
938: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP"
939: \ will iterate as often as "high low ?DO inc S+LOOP". For positive
940: \ increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for
941: \ negative increments.
942: : S+LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ gforth s-plus-loop
943: ['] (s+loop) ['] (s+loop)-lp+!# loop-like ; immediate restrict
944:
945: : NEXT ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ gforth
946: ['] (next) ['] (next)-lp+!# loop-like ; immediate restrict
947:
948: \ Structural Conditionals 12dec92py
949:
950: : EXIT ( compilation -- ; run-time nest-sys -- ) \ core
951: 0 adjust-locals-size
952: POSTPONE ;s
953: POSTPONE unreachable ; immediate restrict
954:
955: : ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth
956: POSTPONE if POSTPONE exit POSTPONE then ; immediate restrict
957:
958: \ Strings 22feb93py
959:
960: : ," ( "string"<"> -- ) [char] " parse
961: here over char+ allot place align ;
962: : "lit ( -- addr )
963: r> r> dup count + aligned >r swap >r ;
964: : (.") "lit count type ;
965: : (S") "lit count ;
966: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
967: postpone (S") here over char+ allot place align ;
968: immediate restrict
969: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren
970: BEGIN
971: >in @ [char] ) parse nip >in @ rot - =
972: WHILE
973: loadfile @ IF
974: refill 0= abort" missing ')' in paren comment"
975: THEN
976: REPEAT ; immediate
977: : \ ( -- ) \ core-ext backslash
978: blk @
979: IF
980: >in @ c/l / 1+ c/l * >in !
981: EXIT
982: THEN
983: source >in ! drop ; immediate
984:
985: : \G ( -- ) \ gforth backslash
986: POSTPONE \ ; immediate
987:
988: \ error handling 22feb93py
989: \ 'abort thrown out! 11may93jaw
990:
991: : (abort")
992: "lit >r
993: IF
994: r> "error ! -2 throw
995: THEN
996: rdrop ;
997: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
998: postpone (abort") ," ; immediate restrict
999:
1000: \ Header states 23feb93py
1001:
1002: : cset ( bmask c-addr -- )
1003: tuck c@ or swap c! ;
1004: : creset ( bmask c-addr -- )
1005: tuck c@ swap invert and swap c! ;
1006: : ctoggle ( bmask c-addr -- )
1007: tuck c@ xor swap c! ;
1008:
1009: : lastflags ( -- c-addr )
1010: \ the address of the flags byte in the last header
1011: \ aborts if the last defined word was headerless
1012: last @ dup 0= abort" last word was headerless" cell+ ;
1013:
1014: : immediate ( -- ) \ core
1015: immediate-mask lastflags cset ;
1016: : restrict ( -- ) \ gforth
1017: restrict-mask lastflags cset ;
1018: ' restrict alias compile-only ( -- ) \ gforth
1019:
1020: \ Header 23feb93py
1021:
1022: \ input-stream, nextname and noname are quite ugly (passing
1023: \ information through global variables), but they are useful for dealing
1024: \ with existing/independent defining words
1025:
1026: defer (header)
1027: defer header ( -- ) \ gforth
1028: ' (header) IS header
1029:
1030: : string, ( c-addr u -- ) \ gforth
1031: \ puts down string as cstring
1032: dup c, here swap chars dup allot move ;
1033:
1034: : header, ( c-addr u -- ) \ gforth
1035: name-too-long?
1036: align here last !
1037: current @ 1 or A, \ link field; before revealing, it contains the
1038: \ tagged reveal-into wordlist
1039: string, cfalign
1040: alias-mask lastflags cset ;
1041:
1042: : input-stream-header ( "name" -- )
1043: name name-too-short? header, ;
1044: : input-stream ( -- ) \ general
1045: \ switches back to getting the name from the input stream ;
1046: ['] input-stream-header IS (header) ;
1047:
1048: ' input-stream-header IS (header)
1049:
1050: \ !! make that a 2variable
1051: create nextname-buffer 32 chars allot
1052:
1053: : nextname-header ( -- )
1054: nextname-buffer count header,
1055: input-stream ;
1056:
1057: \ the next name is given in the string
1058: : nextname ( c-addr u -- ) \ gforth
1059: name-too-long?
1060: nextname-buffer c! ( c-addr )
1061: nextname-buffer count move
1062: ['] nextname-header IS (header) ;
1063:
1064: : noname-header ( -- )
1065: 0 last ! cfalign
1066: input-stream ;
1067:
1068: : noname ( -- ) \ gforth
1069: \ the next defined word remains anonymous. The xt of that word is given by lastxt
1070: ['] noname-header IS (header) ;
1071:
1072: : lastxt ( -- xt ) \ gforth
1073: \ 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
1074: lastcfa @ ;
1075:
1076: : Alias ( cfa "name" -- ) \ gforth
1077: Header reveal
1078: alias-mask lastflags creset
1079: dup A, lastcfa ! ;
1080:
1081: : name>string ( nfa -- addr count ) \ gforth name-to-string
1082: cell+ count $1F and ;
1083:
1084: Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
1085: : >name ( cfa -- nfa ) \ gforth to-name
1086: $21 cell do
1087: dup i - count $9F and + cfaligned over alias-mask + = if
1088: i - cell - unloop exit
1089: then
1090: cell +loop
1091: drop ??? ( wouldn't 0 be better? ) ;
1092:
1093: \ threading 17mar93py
1094:
1095: : cfa, ( code-address -- ) \ gforth cfa-comma
1096: here
1097: dup lastcfa !
1098: 0 A, 0 , code-address! ;
1099: : compile, ( xt -- ) \ core-ext compile-comma
1100: A, ;
1101: : !does ( addr -- ) \ gforth store-does
1102: lastxt does-code! ;
1103: : (does>) ( R: addr -- )
1104: r> /does-handler + !does ;
1105: : dodoes, ( -- )
1106: here /does-handler allot does-handler! ;
1107:
1108: : Create ( "name" -- ) \ core
1109: Header reveal dovar: cfa, ;
1110:
1111: \ Create Variable User Constant 17mar93py
1112:
1113: : Variable ( "name" -- ) \ core
1114: Create 0 , ;
1115: : AVariable ( "name" -- ) \ gforth
1116: Create 0 A, ;
1117: : 2VARIABLE ( "name" -- ) \ double
1118: create 0 , 0 , ;
1119:
1120: : User ( "name" -- ) \ gforth
1121: Variable ;
1122: : AUser ( "name" -- ) \ gforth
1123: AVariable ;
1124:
1125: : (Constant) Header reveal docon: cfa, ;
1126: : Constant ( w "name" -- ) \ core
1127: \ \G Defines constant @var{name}
1128: \ \G
1129: \ \G @var{name} execution: @var{-- w}
1130: (Constant) , ;
1131: : AConstant ( addr "name" -- ) \ gforth
1132: (Constant) A, ;
1133:
1134: : 2Constant ( w1 w2 "name" -- ) \ double
1135: Create ( w1 w2 "name" -- )
1136: 2,
1137: DOES> ( -- w1 w2 )
1138: 2@ ;
1139:
1140: \ IS Defer What's Defers TO 24feb93py
1141:
1142: : Defer ( "name" -- ) \ gforth
1143: \ !! shouldn't it be initialized with abort or something similar?
1144: Header Reveal dodefer: cfa,
1145: ['] noop A, ;
1146: \ Create ( -- )
1147: \ ['] noop A,
1148: \ DOES> ( ??? )
1149: \ perform ;
1150:
1151: : Defers ( "name" -- ) \ gforth
1152: ' >body @ compile, ; immediate
1153:
1154: \ : ; 24feb93py
1155:
1156: defer :-hook ( sys1 -- sys2 )
1157: defer ;-hook ( sys2 -- sys1 )
1158:
1159: : : ( "name" -- colon-sys ) \ core colon
1160: Header docol: cfa, defstart ] :-hook ;
1161: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1162: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1163:
1164: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
1165: 0 last !
1166: cfalign here docol: cfa, 0 ] :-hook ;
1167:
1168: \ Search list handling 23feb93py
1169:
1170: AVariable current ( -- addr ) \ gforth
1171:
1172: : last? ( -- false / nfa nfa )
1173: last @ ?dup ;
1174: : (reveal) ( nfa wid -- )
1175: ( wid>wordlist-id ) dup >r
1176: @ over ( name>link ) !
1177: r> ! ;
1178:
1179: \ object oriented search list 17mar93py
1180:
1181: \ word list structure:
1182:
1183: struct
1184: 1 cells: field find-method \ xt: ( c_addr u wid -- name-id )
1185: 1 cells: field reveal-method \ xt: ( nfa wid -- ) \ used by dofield:, must be field
1186: 1 cells: field rehash-method \ xt: ( wid -- )
1187: \ \ !! what else
1188: end-struct wordlist-map-struct
1189:
1190: struct
1191: 1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
1192: 1 cells: field wordlist-map \ pointer to a wordlist-map-struct
1193: 1 cells: field wordlist-link \ link field to other wordlists
1194: 1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
1195: end-struct wordlist-struct
1196:
1197: : f83find ( addr len wordlist -- nfa / false )
1198: ( wid>wordlist-id ) @ (f83find) ;
1199:
1200: \ Search list table: find reveal
1201: Create f83search ( -- wordlist-map )
1202: ' f83find A, ' (reveal) A, ' drop A,
1203:
1204: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
1205: AVariable lookup G forth-wordlist lookup T !
1206: G forth-wordlist current T !
1207:
1208: \ higher level parts of find
1209:
1210: ( struct )
1211: 0 >body cell
1212: 1 cells: field interpret/compile-int
1213: 1 cells: field interpret/compile-comp
1214: end-struct interpret/compile-struct
1215:
1216: : interpret/compile? ( xt -- flag )
1217: >does-code ['] S" >does-code = ;
1218:
1219: : (cfa>int) ( cfa -- xt )
1220: dup interpret/compile?
1221: if
1222: interpret/compile-int @
1223: then ;
1224:
1225: : (x>int) ( cfa b -- xt )
1226: \ get interpretation semantics of name
1227: restrict-mask and
1228: if
1229: drop ['] compile-only-error
1230: else
1231: (cfa>int)
1232: then ;
1233:
1234: : name>int ( nfa -- xt ) \ gforth
1235: (name>x) (x>int) ;
1236:
1237: : name?int ( nfa -- xt ) \ gforth
1238: \ like name>int, but throws an error if compile-only
1239: (name>x) restrict-mask and
1240: if
1241: compile-only-error \ does not return
1242: then
1243: (cfa>int) ;
1244:
1245: : name>comp ( nfa -- w xt ) \ gforth
1246: \ get compilation semantics of name
1247: (name>x) >r dup interpret/compile?
1248: if
1249: interpret/compile-comp @
1250: then
1251: r> immediate-mask and if
1252: ['] execute
1253: else
1254: ['] compile,
1255: then ;
1256:
1257: : (search-wordlist) ( addr count wid -- nfa / false )
1258: dup wordlist-map @ find-method perform ;
1259:
1260: : flag-sign ( f -- 1|-1 )
1261: \ true becomes 1, false -1
1262: 0= 2* 1+ ;
1263:
1264: : (name>intn) ( nfa -- xt +-1 )
1265: (name>x) tuck (x>int) ( b xt )
1266: swap immediate-mask and flag-sign ;
1267:
1268: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
1269: \ xt is the interpretation semantics
1270: (search-wordlist) dup if
1271: (name>intn)
1272: then ;
1273:
1274: : find-name ( c-addr u -- nfa/0 )
1275: lookup @ (search-wordlist) ;
1276:
1277: : sfind ( c-addr u -- 0 / xt +-1 ) \ gforth-obsolete
1278: find-name dup
1279: if ( nfa )
1280: state @
1281: if
1282: name>comp ['] execute = flag-sign
1283: else
1284: (name>intn)
1285: then
1286: then ;
1287:
1288: : find ( c-addr -- xt +-1 / c-addr 0 ) \ core
1289: dup count sfind dup
1290: if
1291: rot drop
1292: then ;
1293:
1294: : (') ( "name" -- nfa ) \ gforth
1295: name find-name dup 0=
1296: IF
1297: drop -&13 bounce
1298: THEN ;
1299:
1300: : [(')] ( compilation "name" -- ; run-time -- nfa ) \ gforth bracket-paren-tick
1301: (') postpone ALiteral ; immediate restrict
1302:
1303: : ' ( "name" -- xt ) \ core tick
1304: (') name?int ;
1305: : ['] ( compilation "name" -- ; run-time -- xt ) \ core bracket-tick
1306: ' postpone ALiteral ; immediate restrict
1307:
1308: : COMP' ( "name" -- w xt ) \ gforth c-tick
1309: (') name>comp ;
1310: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1311: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
1312:
1313: \ reveal words
1314:
1315: Variable warnings ( -- addr ) \ gforth
1316: G -1 warnings T !
1317:
1318: : check-shadow ( addr count wid -- )
1319: \ prints a warning if the string is already present in the wordlist
1320: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
1321: ." redefined " name>string 2dup type
1322: compare 0<> if
1323: ." with " type
1324: else
1325: 2drop
1326: then
1327: space space EXIT
1328: then
1329: 2drop 2drop ;
1330:
1331: : reveal ( -- ) \ gforth
1332: last?
1333: if \ the last word has a header
1334: dup ( name>link ) @ 1 and
1335: if \ it is still hidden
1336: dup ( name>link ) @ 1 xor ( nfa wid )
1337: 2dup >r name>string r> check-shadow ( nfa wid )
1338: dup wordlist-map @ reveal-method perform
1339: then
1340: then ;
1341:
1342: : rehash ( wid -- )
1343: dup wordlist-map @ rehash-method perform ;
1344:
1345: \ Input 13feb93py
1346:
1347: 07 constant #bell ( -- c ) \ gforth
1348: 08 constant #bs ( -- c ) \ gforth
1349: 09 constant #tab ( -- c ) \ gforth
1350: 7F constant #del ( -- c ) \ gforth
1351: 0D constant #cr ( -- c ) \ gforth
1352: \ the newline key code
1353: 0C constant #ff ( -- c ) \ gforth
1354: 0A constant #lf ( -- c ) \ gforth
1355:
1356: : bell #bell emit ;
1357: : cr ( -- ) \ core
1358: \ emit a newline
1359: #lf ( sic! ) emit ;
1360:
1361: \ : backspaces 0 ?DO #bs emit LOOP ;
1362:
1363: : (ins) ( max span addr pos1 key -- max span addr pos2 )
1364: >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
1365: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
1366: dup IF
1367: #bs emit bl emit #bs emit 1- rot 1- -rot
1368: THEN false ;
1369: : (ret) true space ;
1370:
1371: Create ctrlkeys
1372: ] false false false false false false false false
1373: (bs) false (ret) false false (ret) false false
1374: false false false false false false false false
1375: false false false false false false false false [
1376:
1377: defer insert-char
1378: ' (ins) IS insert-char
1379: defer everychar
1380: ' noop IS everychar
1381:
1382: : decode ( max span addr pos1 key -- max span addr pos2 flag )
1383: everychar
1384: dup #del = IF drop #bs THEN \ del is rubout
1385: dup bl < IF cells ctrlkeys + perform EXIT THEN
1386: >r 2over = IF rdrop bell 0 EXIT THEN
1387: r> insert-char 0 ;
1388:
1389: : accept ( addr len -- len ) \ core
1390: dup 0< IF abs over dup 1 chars - c@ tuck type
1391: \ this allows to edit given strings
1392: ELSE 0 THEN rot over
1393: BEGIN key decode UNTIL
1394: 2drop nip ;
1395:
1396: \ Output 13feb93py
1397:
1398: : (type) ( c-addr u -- ) \ gforth
1399: outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1400: ;
1401:
1402: Defer type ( c-addr u -- ) \ core
1403: \ defer type for a output buffer or fast
1404: \ screen write
1405:
1406: ' (type) IS Type
1407:
1408: : (emit) ( c -- ) \ gforth
1409: outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1410: ;
1411:
1412: Defer emit ( c -- ) \ core
1413: ' (Emit) IS Emit
1414:
1415: Defer key ( -- c ) \ core
1416: ' (key) IS key
1417:
1418: \ Query 07apr93py
1419:
1420: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1421: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
1422: tib /line
1423: loadfile @ ?dup
1424: IF read-line throw
1425: ELSE sourceline# 0< IF 2drop false EXIT THEN
1426: accept true
1427: THEN
1428: 1 loadline +!
1429: swap #tib ! 0 >in ! ;
1430:
1431: : Query ( -- ) \ core-ext
1432: \ obsolescent
1433: loadfile off blk off refill drop ;
1434:
1435: \ File specifiers 11jun93jaw
1436:
1437:
1438: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
1439: \ 2 c, here char r c, char + c, 0 c,
1440: \ 2 c, here char w c, char + c, 0 c, align
1441: 4 Constant w/o ( -- fam ) \ file w-o
1442: 2 Constant r/w ( -- fam ) \ file r-w
1443: 0 Constant r/o ( -- fam ) \ file r-o
1444:
1445: \ BIN WRITE-LINE 11jun93jaw
1446:
1447: \ : bin dup 1 chars - c@
1448: \ r/o 4 chars + over - dup >r swap move r> ;
1449:
1450: : bin ( fam1 -- fam2 ) \ file
1451: 1 or ;
1452:
1453: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
1454: \ or not unix environments if
1455: \ bin is not selected
1456:
1457: : write-line ( c-addr u fileid -- ior ) \ file
1458: dup >r write-file
1459: ?dup IF
1460: r> drop EXIT
1461: THEN
1462: nl$ count r> write-file ;
1463:
1464: \ include-file 07apr93py
1465:
1466: : push-file ( -- ) r>
1467: sourceline# >r loadfile @ >r
1468: blk @ >r tibstack @ >r >tib @ >r #tib @ >r
1469: >tib @ tibstack @ = IF r@ tibstack +! THEN
1470: tibstack @ >tib ! >in @ >r >r ;
1471:
1472: : pop-file ( throw-code -- throw-code )
1473: dup IF
1474: source >in @ sourceline# sourcefilename
1475: error-stack dup @ dup 1+
1476: max-errors 1- min error-stack !
1477: 6 * cells + cell+
1478: 5 cells bounds swap DO
1479: I !
1480: -1 cells +LOOP
1481: THEN
1482: r>
1483: r> >in ! r> #tib ! r> >tib ! r> tibstack ! r> blk !
1484: r> loadfile ! r> loadline ! >r ;
1485:
1486: : read-loop ( i*x -- j*x )
1487: BEGIN refill WHILE interpret REPEAT ;
1488:
1489: : include-file ( i*x fid -- j*x ) \ file
1490: push-file loadfile !
1491: 0 loadline ! blk off ['] read-loop catch
1492: loadfile @ close-file swap 2dup or
1493: pop-file drop throw throw ;
1494:
1495: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
1496:
1497: \ : check-file-prefix ( addr len -- addr' len' flag )
1498: \ dup 0= IF true EXIT THEN
1499: \ over c@ '/ = IF true EXIT THEN
1500: \ over 2 S" ./" compare 0= IF true EXIT THEN
1501: \ over 3 S" ../" compare 0= IF true EXIT THEN
1502: \ over 2 S" ~/" compare 0=
1503: \ IF 1 /string
1504: \ S" HOME" getenv tuck pathfilenamebuf swap move
1505: \ 2dup + >r pathfilenamebuf + swap move
1506: \ pathfilenamebuf r> true
1507: \ ELSE false
1508: \ THEN ;
1509:
1510: : absolut-path? ( addr u -- flag ) \ gforth
1511: \ a path is absolute, if it starts with a / or a ~ (~ expansion),
1512: \ or if it is in the form ./* or ../*, extended regexp: [/~]|./|../
1513: \ Pathes simply containing a / are not absolute!
1514: over c@ '/ = >r
1515: over c@ '~ = >r
1516: 2dup 2 min S" ./" compare 0= >r
1517: 3 min S" ../" compare 0=
1518: r> r> r> or or or ;
1519: \ [char] / scan nip 0<> ;
1520:
1521: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
1522: \ opens a file for reading, searching in the path for it (unless
1523: \ the filename contains a slash); c-addr2 u2 is the full filename
1524: \ (valid until the next call); if the file is not found (or in
1525: \ case of other errors for each try), -38 (non-existant file) is
1526: \ thrown. Opening for other access modes makes little sense, as
1527: \ the path will usually contain dirs that are only readable for
1528: \ the user
1529: \ !! use file-status to determine access mode?
1530: 2dup absolut-path?
1531: if \ the filename contains a slash
1532: 2dup r/o open-file throw ( c-addr1 u1 file-id )
1533: -rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
1534: pathfilenamebuf r> EXIT
1535: then
1536: pathdirs 2@ 0
1537: \ check-file-prefix 0=
1538: \ IF pathdirs 2@ 0
1539: ?DO ( c-addr1 u1 dirnamep )
1540: dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
1541: 2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
1542: pathfilenamebuf over r> + dup >r r/o open-file 0=
1543: IF ( addr u file-id )
1544: nip nip r> rdrop 0 LEAVE
1545: THEN
1546: rdrop drop r> cell+ cell+
1547: LOOP
1548: \ ELSE 2dup open-file throw -rot THEN
1549: 0<> -&38 and throw ( file-id u2 )
1550: pathfilenamebuf swap ;
1551:
1552: create included-files 0 , 0 , ( pointer to and count of included files )
1553: here ," the terminal" dup c@ swap 1 + swap , A, here 2 cells -
1554: create image-included-files 1 , A, ( pointer to and count of included files )
1555: \ included-files points to ALLOCATEd space, while image-included-files
1556: \ points to ALLOTed objects, so it survives a save-system
1557:
1558: : loadfilename ( -- a-addr )
1559: \ a-addr 2@ produces the current file name ( c-addr u )
1560: included-files 2@ drop loadfilename# @ 2* cells + ;
1561:
1562: : sourcefilename ( -- c-addr u ) \ gforth
1563: \ the name of the source file which is currently the input
1564: \ source. The result is valid only while the file is being
1565: \ loaded. If the current input source is no (stream) file, the
1566: \ result is undefined.
1567: loadfilename 2@ ;
1568:
1569: : sourceline# ( -- u ) \ gforth sourceline-number
1570: \ the line number of the line that is currently being interpreted
1571: \ from a (stream) file. The first line has the number 1. If the
1572: \ current input source is no (stream) file, the result is
1573: \ undefined.
1574: loadline @ ;
1575:
1576: : init-included-files ( -- )
1577: image-included-files 2@ 2* cells save-mem drop ( addr )
1578: image-included-files 2@ nip included-files 2! ;
1579:
1580: : included? ( c-addr u -- f ) \ gforth
1581: \ true, iff filename c-addr u is in included-files
1582: included-files 2@ 0
1583: ?do ( c-addr u addr )
1584: dup >r 2@ 2over compare 0=
1585: if
1586: 2drop rdrop unloop
1587: true EXIT
1588: then
1589: r> cell+ cell+
1590: loop
1591: 2drop drop false ;
1592:
1593: : add-included-file ( c-addr u -- ) \ gforth
1594: \ add name c-addr u to included-files
1595: included-files 2@ 2* cells 2 cells extend-mem
1596: 2/ cell / included-files 2!
1597: 2! ;
1598: \ included-files 2@ tuck 1+ 2* cells resize throw
1599: \ swap 2dup 1+ included-files 2!
1600: \ 2* cells + 2! ;
1601:
1602: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1603: \ include the file file-id with the name given by c-addr u
1604: loadfilename# @ >r
1605: save-mem add-included-file ( file-id )
1606: included-files 2@ nip 1- loadfilename# !
1607: ['] include-file catch
1608: r> loadfilename# !
1609: throw ;
1610:
1611: : included ( i*x addr u -- j*x ) \ file
1612: open-path-file included1 ;
1613:
1614: : required ( i*x addr u -- j*x ) \ gforth
1615: \ include the file with the name given by addr u, if it is not
1616: \ included already. Currently this works by comparing the name of
1617: \ the file (with path) against the names of earlier included
1618: \ files; however, it would probably be better to fstat the file,
1619: \ and compare the device and inode. The advantages would be: no
1620: \ problems with several paths to the same file (e.g., due to
1621: \ links) and we would catch files included with include-file and
1622: \ write a require-file.
1623: open-path-file 2dup included?
1624: if
1625: 2drop close-file throw
1626: else
1627: included1
1628: then ;
1629:
1630: \ HEX DECIMAL 2may93jaw
1631:
1632: : decimal ( -- ) \ core
1633: a base ! ;
1634: : hex ( -- ) \ core-ext
1635: 10 base ! ;
1636:
1637: \ DEPTH 9may93jaw
1638:
1639: : depth ( -- +n ) \ core
1640: sp@ s0 @ swap - cell / ;
1641: : clearstack ( ... -- )
1642: s0 @ sp! ;
1643:
1644: \ INCLUDE 9may93jaw
1645:
1646: : include ( "file" -- ) \ gforth
1647: name included ;
1648:
1649: : require ( "file" -- ) \ gforth
1650: name required ;
1651:
1652: \ RECURSE 17may93jaw
1653:
1654: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1655: lastxt compile, ; immediate restrict
1656: ' reveal alias recursive ( -- ) \ gforth
1657: immediate
1658:
1659: \ */MOD */ 17may93jaw
1660:
1661: \ !! I think */mod should have the same rounding behaviour as / - anton
1662: : */mod ( n1 n2 n3 -- n4 n5 ) \ core star-slash-mod
1663: >r m* r> sm/rem ;
1664:
1665: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
1666: */mod nip ;
1667:
1668: \ EVALUATE 17may93jaw
1669:
1670: : evaluate ( c-addr len -- ) \ core,block
1671: push-file #tib ! >tib !
1672: >in off blk off loadfile off -1 loadline !
1673: ['] interpret catch
1674: pop-file throw ;
1675:
1676: : abort ( ?? -- ?? ) \ core,exception-ext
1677: -1 throw ;
1678:
1679: \+ environment? true ENV" CORE"
1680: \ core wordset is now complete!
1681:
1682: \ Quit 13feb93py
1683:
1684: Defer 'quit
1685: Defer .status
1686: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
1687: : (quit) BEGIN .status cr query interpret prompt AGAIN ;
1688: ' (quit) IS 'quit
1689:
1690: \ DOERROR (DOERROR) 13jun93jaw
1691:
1692: 8 Constant max-errors
1693: Variable error-stack 0 error-stack !
1694: max-errors 6 * cells allot
1695: \ format of one cell:
1696: \ source ( addr u )
1697: \ >in
1698: \ line-number
1699: \ Loadfilename ( addr u )
1700:
1701: : dec. ( n -- ) \ gforth
1702: \ print value in decimal representation
1703: base @ decimal swap . base ! ;
1704:
1705: : hex. ( u -- ) \ gforth
1706: \ print value as unsigned hex number
1707: '$ emit base @ swap hex u. base ! ;
1708:
1709: : typewhite ( addr u -- ) \ gforth
1710: \ like type, but white space is printed instead of the characters
1711: bounds ?do
1712: i c@ 9 = if \ check for tab
1713: 9
1714: else
1715: bl
1716: then
1717: emit
1718: loop ;
1719:
1720: DEFER DOERROR
1721:
1722: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
1723: cr error-stack @
1724: IF
1725: ." in file included from "
1726: type ." :" dec. drop 2drop
1727: ELSE
1728: type ." :" dec.
1729: cr dup 2over type cr drop
1730: nip -trailing 1- ( line-start index2 )
1731: 0 >r BEGIN
1732: 2dup + c@ bl > WHILE
1733: r> 1+ >r 1- dup 0< UNTIL THEN 1+
1734: ( line-start index1 )
1735: typewhite
1736: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
1737: [char] ^ emit
1738: loop
1739: THEN
1740: ;
1741:
1742: : (DoError) ( throw-code -- )
1743: sourceline# IF
1744: source >in @ sourceline# 0 0 .error-frame
1745: THEN
1746: error-stack @ 0 ?DO
1747: -1 error-stack +!
1748: error-stack dup @ 6 * cells + cell+
1749: 6 cells bounds DO
1750: I @
1751: cell +LOOP
1752: .error-frame
1753: LOOP
1754: dup -2 =
1755: IF
1756: "error @ ?dup
1757: IF
1758: cr count type
1759: THEN
1760: drop
1761: ELSE
1762: .error
1763: THEN
1764: normal-dp dpp ! ;
1765:
1766: ' (DoError) IS DoError
1767:
1768: : quit ( ?? -- ?? ) \ core
1769: r0 @ rp! handler off >tib @ >r
1770: BEGIN
1771: postpone [
1772: ['] 'quit CATCH dup
1773: WHILE
1774: DoError r@ >tib ! r@ tibstack !
1775: REPEAT
1776: drop r> >tib ! ;
1777:
1778: \ Cold 13feb93py
1779:
1780: \ : .name ( name -- ) name>string type space ;
1781: \ : words listwords @
1782: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
1783:
1784: : cstring>sstring ( cstring -- addr n ) \ gforth cstring-to-sstring
1785: -1 0 scan 0 swap 1+ /string ;
1786: : arg ( n -- addr count ) \ gforth
1787: cells argv @ + @ cstring>sstring ;
1788: : #! postpone \ ; immediate
1789:
1790: Create pathstring 2 cells allot \ string
1791: Create pathdirs 2 cells allot \ dir string array, pointer and count
1792: Variable argv
1793: Variable argc
1794:
1795: 0 Value script? ( -- flag )
1796:
1797: : process-path ( addr1 u1 -- addr2 u2 )
1798: \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
1799: align here >r
1800: BEGIN
1801: over >r [char] : scan
1802: over r> tuck - ( rest-str this-str )
1803: dup
1804: IF
1805: 2dup 1- chars + c@ [char] / <>
1806: IF
1807: 2dup chars + [char] / swap c!
1808: 1+
1809: THEN
1810: 2,
1811: ELSE
1812: 2drop
1813: THEN
1814: dup
1815: WHILE
1816: 1 /string
1817: REPEAT
1818: 2drop
1819: here r> tuck - 2 cells / ;
1820:
1821: : do-option ( addr1 len1 addr2 len2 -- n )
1822: 2swap
1823: 2dup s" -e" compare 0= >r
1824: 2dup s" --evaluate" compare 0= r> or
1825: IF 2drop dup >r ['] evaluate catch
1826: ?dup IF dup >r DoError r> negate (bye) THEN
1827: r> >tib +! 2 EXIT THEN
1828: ." Unknown option: " type cr 2drop 1 ;
1829:
1830: : process-args ( -- )
1831: >tib @ >r
1832: argc @ 1
1833: ?DO
1834: I arg over c@ [char] - <>
1835: IF
1836: required 1
1837: ELSE
1838: I 1+ argc @ = IF s" " ELSE I 1+ arg THEN
1839: do-option
1840: THEN
1841: +LOOP
1842: r> >tib ! ;
1843:
1844: Defer 'cold ' noop IS 'cold
1845:
1846: : cold ( -- ) \ gforth
1847: stdout TO outfile-id
1848: pathstring 2@ process-path pathdirs 2!
1849: init-included-files
1850: 'cold
1851: argc @ 1 >
1852: IF
1853: true to script?
1854: ['] process-args catch ?dup
1855: IF
1856: dup >r DoError cr r> negate (bye)
1857: THEN
1858: cr
1859: THEN
1860: false to script?
1861: ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
1862: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
1863: ." Type `bye' to exit"
1864: loadline off quit ;
1865:
1866: : license ( -- ) \ gforth
1867: cr
1868: ." This program is free software; you can redistribute it and/or modify" cr
1869: ." it under the terms of the GNU General Public License as published by" cr
1870: ." the Free Software Foundation; either version 2 of the License, or" cr
1871: ." (at your option) any later version." cr cr
1872:
1873: ." This program is distributed in the hope that it will be useful," cr
1874: ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
1875: ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" cr
1876: ." GNU General Public License for more details." cr cr
1877:
1878: ." You should have received a copy of the GNU General Public License" cr
1879: ." along with this program; if not, write to the Free Software" cr
1880: ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
1881:
1882: : boot ( path **argv argc -- )
1883: argc ! argv ! cstring>sstring pathstring 2! main-task up!
1884: sp@ dup s0 ! $10 + dup >tib ! tibstack ! #tib off >in off
1885: rp@ r0 ! fp@ f0 ! ['] cold catch DoError bye ;
1886:
1887: : bye ( -- ) \ tools-ext
1888: script? 0= IF cr THEN 0 (bye) ;
1889:
1890: \ **argv may be scanned by the C starter to get some important
1891: \ information, as -display and -geometry for an X client FORTH
1892: \ or space and stackspace overrides
1893:
1894: \ 0 arg contains, however, the name of the program.
1895:
1896:
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