1: \ KERNAL.FS GForth kernal 17dec92py
2: \ $ID:
3: \ Idea and implementation: Bernd Paysan (py)
4: \ Copyright 1992 by the ANSI figForth Development Group
5:
6: \ Log: ', '- usw. durch [char] ... ersetzt
7: \ man sollte die unterschiedlichen zahlensysteme
8: \ mit $ und & zumindest im interpreter weglassen
9: \ schon erledigt!
10: \ 11may93jaw
11: \ name> 0= nicht vorhanden 17may93jaw
12: \ nfa can be lfa or nfa!
13: \ find splited into find and (find)
14: \ (find) for later use 17may93jaw
15: \ search replaced by lookup because
16: \ it is a word of the string wordset
17: \ 20may93jaw
18: \ postpone added immediate 21may93jaw
19: \ to added immediate 07jun93jaw
20: \ cfa, header put "here lastcfa !" in
21: \ cfa, this is more logical
22: \ and noname: works wothout
23: \ extra "here lastcfa !" 08jun93jaw
24: \ (parse-white) thrown out
25: \ refill added outer trick
26: \ to show there is something
27: \ going on 09jun93jaw
28: \ leave ?leave somebody forgot UNLOOP!!! 09jun93jaw
29: \ leave ?leave unloop thrown out
30: \ unloop after loop is used 10jun93jaw
31:
32: HEX
33:
34: \ labels for some code addresses
35:
36: : docon: ( -- addr ) \ gforth
37: \ the code address of a @code{CONSTANT}
38: ['] bl >code-address ;
39:
40: : docol: ( -- addr ) \ gforth
41: \ the code address of a colon definition
42: ['] docon: >code-address ;
43:
44: : dovar: ( -- addr ) \ gforth
45: \ the code address of a @code{CREATE}d word
46: ['] udp >code-address ;
47:
48: : douser: ( -- addr ) \ gforth
49: \ the code address of a @code{USER} variable
50: ['] s0 >code-address ;
51:
52: : dodefer: ( -- addr ) \ gforth
53: \ the code address of a @code{defer}ed word
54: ['] source >code-address ;
55:
56: : dofield: ( -- addr ) \ gforth
57: \ the code address of a @code{field}
58: ['] reveal-method >code-address ;
59:
60: \ Bit string manipulation 06oct92py
61:
62: Create bits 80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
63: DOES> ( n -- ) + c@ ;
64:
65: : >bit ( addr n -- c-addr mask ) 8 /mod rot + swap bits ;
66: : +bit ( addr n -- ) >bit over c@ or swap c! ;
67:
68: : relinfo ( -- addr ) forthstart dup @ + ;
69: : >rel ( addr -- n ) forthstart - ;
70: : relon ( addr -- ) relinfo swap >rel cell / +bit ;
71:
72: \ here allot , c, A, 17dec92py
73:
74: : dp ( -- addr ) \ gforth
75: dpp @ ;
76: : here ( -- here ) \ core
77: dp @ ;
78: : allot ( n -- ) \ core
79: dp +! ;
80: : c, ( c -- ) \ core
81: here 1 chars allot c! ;
82: : , ( x -- ) \ core
83: here cell allot ! ;
84: : 2, ( w1 w2 -- ) \ gforth
85: here 2 cells allot 2! ;
86:
87: : aligned ( addr -- addr' ) \ core
88: [ cell 1- ] Literal + [ -1 cells ] Literal and ;
89: : align ( -- ) \ core
90: here dup aligned swap ?DO bl c, LOOP ;
91:
92: : faligned ( addr -- f-addr ) \ float
93: [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
94:
95: : falign ( -- ) \ float
96: here dup faligned swap
97: ?DO
98: bl c,
99: LOOP ;
100:
101: \ !! this is machine-dependent, but works on all but the strangest machines
102: ' faligned Alias maxaligned ( addr1 -- addr2 ) \ gforth
103: ' falign Alias maxalign ( -- ) \ gforth
104:
105: \ !! machine-dependent and won't work if "0 >body" <> "0 >body maxaligned"
106: ' maxaligned Alias cfaligned ( addr1 -- addr2 ) \ gforth
107: \ the code field is aligned if its body is maxaligned
108: ' maxalign Alias cfalign ( -- ) \ gforth
109:
110: : chars ( n1 -- n2 ) \ core
111: ; immediate
112:
113:
114: : A! ( addr1 addr2 -- ) \ gforth
115: dup relon ! ;
116: : A, ( addr -- ) \ gforth
117: here cell allot A! ;
118:
119: \ on off 23feb93py
120:
121: : on ( addr -- ) \ gforth
122: true swap ! ;
123: : off ( addr -- ) \ gforth
124: false swap ! ;
125:
126: \ name> found 17dec92py
127:
128: : (name>) ( nfa -- cfa )
129: count $1F and + cfaligned ;
130: : name> ( nfa -- cfa ) \ gforth
131: cell+
132: dup (name>) swap c@ $80 and 0= IF @ THEN ;
133:
134: : found ( nfa -- cfa n ) \ gforth
135: cell+
136: dup c@ >r (name>) r@ $80 and 0= IF @ THEN
137: -1 r@ $40 and IF 1- THEN
138: r> $20 and IF negate THEN ;
139:
140: \ (find) 17dec92py
141:
142: \ : (find) ( addr count nfa1 -- nfa2 / false )
143: \ BEGIN dup WHILE dup >r
144: \ cell+ count $1F and dup >r 2over r> =
145: \ IF -text 0= IF 2drop r> EXIT THEN
146: \ ELSE 2drop drop THEN r> @
147: \ REPEAT nip nip ;
148:
149: \ place bounds 13feb93py
150:
151: : place ( addr len to -- ) \ gforth
152: over >r rot over 1+ r> move c! ;
153: : bounds ( beg count -- end beg ) \ gforth
154: over + swap ;
155:
156: \ input stream primitives 23feb93py
157:
158: : tib ( -- c-addr ) \ core-ext
159: \ obsolescent
160: >tib @ ;
161: Defer source ( -- addr count ) \ core
162: \ used by dodefer:, must be defer
163: : (source) ( -- addr count )
164: tib #tib @ ;
165: ' (source) IS source
166:
167: \ (word) 22feb93py
168:
169: : scan ( addr1 n1 char -- addr2 n2 ) \ gforth
170: \ skip all characters not equal to char
171: >r
172: BEGIN
173: dup
174: WHILE
175: over c@ r@ <>
176: WHILE
177: 1 /string
178: REPEAT THEN
179: rdrop ;
180: : skip ( addr1 n1 char -- addr2 n2 ) \ gforth
181: \ skip all characters 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:
192: : (word) ( addr1 n1 char -- addr2 n2 )
193: dup >r skip 2dup r> scan nip - ;
194:
195: \ (word) should fold white spaces
196: \ this is what (parse-white) does
197:
198: \ word parse 23feb93py
199:
200: : parse-word ( char -- addr len ) \ gforth
201: source 2dup >r >r >in @ over min /string
202: rot dup bl = IF drop (parse-white) ELSE (word) THEN
203: 2dup + r> - 1+ r> min >in ! ;
204: : word ( char -- addr ) \ core
205: parse-word here place bl here count + c! here ;
206:
207: : parse ( char -- addr len ) \ core-ext
208: >r source >in @ over min /string over swap r> scan >r
209: over - dup r> IF 1+ THEN >in +! ;
210:
211: \ name 13feb93py
212:
213: : capitalize ( addr len -- addr len ) \ gforth
214: 2dup chars chars bounds
215: ?DO I c@ toupper I c! 1 chars +LOOP ;
216: : (name) ( -- c-addr count )
217: source 2dup >r >r >in @ /string (parse-white)
218: 2dup + r> - 1+ r> min >in ! ;
219: \ name count ;
220:
221: : name-too-short? ( c-addr u -- c-addr u )
222: dup 0= -&16 and throw ;
223:
224: : name-too-long? ( c-addr u -- c-addr u )
225: dup $1F u> -&19 and throw ;
226:
227: \ Literal 17dec92py
228:
229: : Literal ( compilation n -- ; run-time -- n ) \ core
230: state @ IF postpone lit , THEN ; immediate
231: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
232: state @ IF postpone lit A, THEN ;
233: immediate
234:
235: : char ( 'char' -- n ) \ core
236: bl word char+ c@ ;
237: : [char] ( compilation 'char' -- ; run-time -- n )
238: char postpone Literal ; immediate
239: ' [char] Alias Ascii immediate
240:
241: : (compile) ( -- ) \ gforth
242: r> dup cell+ >r @ compile, ;
243: : postpone ( "name" -- ) \ core
244: name sfind dup 0= abort" Can't compile "
245: 0> IF compile, ELSE postpone (compile) A, THEN ;
246: immediate restrict
247:
248: \ Use (compile) for the old behavior of compile!
249:
250: \ digit? 17dec92py
251:
252: : digit? ( char -- digit true/ false ) \ gforth
253: base @ $100 =
254: IF
255: true EXIT
256: THEN
257: toupper [char] 0 - dup 9 u> IF
258: [ 'A '9 1 + - ] literal -
259: dup 9 u<= IF
260: drop false EXIT
261: THEN
262: THEN
263: dup base @ u>= IF
264: drop false EXIT
265: THEN
266: true ;
267:
268: : accumulate ( +d0 addr digit - +d1 addr )
269: swap >r swap base @ um* drop rot base @ um* d+ r> ;
270:
271: : >number ( d addr count -- d addr count ) \ core
272: 0
273: ?DO
274: count digit?
275: WHILE
276: accumulate
277: LOOP
278: 0
279: ELSE
280: 1- I' I -
281: UNLOOP
282: THEN ;
283:
284: \ number? number 23feb93py
285:
286: Create bases 10 , 2 , A , 100 ,
287: \ 16 2 10 Zeichen
288: \ !! this saving and restoring base is an abomination! - anton
289: : getbase ( addr u -- addr' u' )
290: over c@ [char] $ - dup 4 u<
291: IF
292: cells bases + @ base ! 1 /string
293: ELSE
294: drop
295: THEN ;
296: : s>number ( addr len -- d )
297: base @ >r dpl on
298: over c@ '- = dup >r
299: IF
300: 1 /string
301: THEN
302: getbase dpl on 0 0 2swap
303: BEGIN
304: dup >r >number dup
305: WHILE
306: dup r> -
307: WHILE
308: dup dpl ! over c@ [char] . =
309: WHILE
310: 1 /string
311: REPEAT THEN
312: 2drop rdrop dpl off
313: ELSE
314: 2drop rdrop r>
315: IF
316: dnegate
317: THEN
318: THEN
319: r> base ! ;
320:
321: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
322: s>number dpl @ 0=
323: IF
324: 2drop false EXIT
325: THEN
326: dpl @ dup 0> 0= IF
327: nip
328: THEN ;
329: : number? ( string -- string 0 / n -1 / d 0> )
330: dup >r count snumber? dup if
331: rdrop
332: else
333: r> swap
334: then ;
335: : s>d ( n -- d ) \ core s-to-d
336: dup 0< ;
337: : number ( string -- d )
338: number? ?dup 0= abort" ?" 0<
339: IF
340: s>d
341: THEN ;
342:
343: \ space spaces ud/mod 21mar93py
344: decimal
345: Create spaces ( u -- ) \ core
346: bl 80 times \ times from target compiler! 11may93jaw
347: DOES> ( u -- )
348: swap
349: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
350: Create backspaces
351: 08 80 times \ times from target compiler! 11may93jaw
352: DOES> ( u -- )
353: swap
354: 0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
355: hex
356: : space ( -- ) \ core
357: 1 spaces ;
358:
359: : ud/mod ( ud1 u2 -- urem udquot ) \ gforth
360: >r 0 r@ um/mod r> swap >r
361: um/mod r> ;
362:
363: : pad ( -- addr ) \ core-ext
364: here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
365:
366: \ hold <# #> sign # #s 25jan92py
367:
368: : hold ( char -- ) \ core
369: pad cell - -1 chars over +! @ c! ;
370:
371: : <# ( -- ) \ core less-number-sign
372: pad cell - dup ! ;
373:
374: : #> ( xd -- addr u ) \ core number-sign-greater
375: 2drop pad cell - dup @ tuck - ;
376:
377: : sign ( n -- ) \ core
378: 0< IF [char] - hold THEN ;
379:
380: : # ( ud1 -- ud2 ) \ core number-sign
381: base @ 2 max ud/mod rot 9 over <
382: IF
383: [ char A char 9 - 1- ] Literal +
384: THEN
385: [char] 0 + hold ;
386:
387: : #s ( +d -- 0 0 ) \ core number-sign-s
388: BEGIN
389: # 2dup d0=
390: UNTIL ;
391:
392: \ print numbers 07jun92py
393:
394: : d.r ( d n -- ) \ double d-dot-r
395: >r tuck dabs <# #s rot sign #>
396: r> over - spaces type ;
397:
398: : ud.r ( ud n -- ) \ gforth u-d-dot-r
399: >r <# #s #> r> over - spaces type ;
400:
401: : .r ( n1 n2 -- ) \ core-ext dot-r
402: >r s>d r> d.r ;
403: : u.r ( u n -- ) \ core-ext u-dot-r
404: 0 swap ud.r ;
405:
406: : d. ( d -- ) \ double d-dot
407: 0 d.r space ;
408: : ud. ( ud -- ) \ gforth u-d-dot
409: 0 ud.r space ;
410:
411: : . ( n -- ) \ core dot
412: s>d d. ;
413: : u. ( u -- ) \ core u-dot
414: 0 ud. ;
415:
416: \ catch throw 23feb93py
417: \ bounce 08jun93jaw
418:
419: \ !! allow the user to add rollback actions anton
420: \ !! use a separate exception stack? anton
421:
422: : lp@ ( -- addr ) \ gforth l-p-fetch
423: laddr# [ 0 , ] ;
424:
425: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception
426: >r sp@ r> swap >r \ don't count xt! jaw
427: fp@ >r
428: lp@ >r
429: handler @ >r
430: rp@ handler !
431: execute
432: r> handler ! rdrop rdrop rdrop 0 ;
433:
434: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
435: ?DUP IF
436: [ here 4 cells ! ]
437: handler @ rp!
438: r> handler !
439: r> lp!
440: r> fp!
441: r> swap >r sp! r>
442: THEN ;
443:
444: \ Bouncing is very fine,
445: \ programming without wasting time... jaw
446: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
447: \ a throw without data or fp stack restauration
448: ?DUP IF
449: handler @ rp!
450: r> handler !
451: r> lp!
452: rdrop
453: rdrop
454: THEN ;
455:
456: \ ?stack 23feb93py
457:
458: : ?stack ( ?? -- ?? ) \ gforth
459: sp@ s0 @ > IF -4 throw THEN
460: fp@ f0 @ > IF -&45 throw THEN ;
461: \ ?stack should be code -- it touches an empty stack!
462:
463: \ interpret 10mar92py
464:
465: Defer parser
466: Defer name ( -- c-addr count ) \ gforth
467: \ get the next word from the input buffer
468: ' (name) IS name
469: Defer notfound ( c-addr count -- )
470:
471: : no.extensions ( addr u -- )
472: 2drop -&13 bounce ;
473: ' no.extensions IS notfound
474:
475: : interpret ( ?? -- ?? ) \ gforth
476: \ interpret/compile the (rest of the) input buffer
477: BEGIN
478: ?stack name dup
479: WHILE
480: parser
481: REPEAT
482: 2drop ;
483:
484: \ interpreter compiler 30apr92py
485:
486: : interpreter ( c-addr u -- ) \ gforth
487: \ interpretation semantics for the name/number c-addr u
488: 2dup sfind dup
489: IF
490: 1 and
491: IF \ not restricted to compile state?
492: nip nip execute EXIT
493: THEN
494: -&14 throw
495: THEN
496: drop
497: 2dup 2>r snumber?
498: IF
499: 2rdrop
500: ELSE
501: 2r> notfound
502: THEN ;
503:
504: ' interpreter IS parser
505:
506: : compiler ( c-addr u -- ) \ gforth
507: \ compilation semantics for the name/number c-addr u
508: 2dup sfind dup
509: IF
510: 0>
511: IF
512: nip nip execute EXIT
513: THEN
514: compile, 2drop EXIT
515: THEN
516: drop
517: 2dup snumber? dup
518: IF
519: 0>
520: IF
521: swap postpone Literal
522: THEN
523: postpone Literal
524: 2drop
525: ELSE
526: drop notfound
527: THEN ;
528:
529: : [ ( -- ) \ core left-bracket
530: ['] interpreter IS parser state off ; immediate
531: : ] ( -- ) \ core right-bracket
532: ['] compiler IS parser state on ;
533:
534: \ locals stuff needed for control structures
535:
536: : compile-lp+! ( n -- ) \ gforth compile-l-p-plus-store
537: dup negate locals-size +!
538: 0 over = if
539: else -1 cells over = if postpone lp-
540: else 1 floats over = if postpone lp+
541: else 2 floats over = if postpone lp+2
542: else postpone lp+!# dup ,
543: then then then then drop ;
544:
545: : adjust-locals-size ( n -- ) \ gforth
546: \ sets locals-size to n and generates an appropriate lp+!
547: locals-size @ swap - compile-lp+! ;
548:
549:
550: here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs
551: AConstant locals-list \ acts like a variable that contains
552: \ a linear list of locals names
553:
554:
555: variable dead-code \ true if normal code at "here" would be dead
556: variable backedge-locals
557: \ contains the locals list that BEGIN will assume to be live on
558: \ the back edge if the BEGIN is unreachable from above. Set by
559: \ ASSUME-LIVE, reset by UNREACHABLE.
560:
561: : UNREACHABLE ( -- ) \ gforth
562: \ declares the current point of execution as unreachable
563: dead-code on
564: 0 backedge-locals ! ; immediate
565:
566: : ASSUME-LIVE ( orig -- orig ) \ gforth
567: \ used immediateliy before a BEGIN that is not reachable from
568: \ above. causes the BEGIN to assume that the same locals are live
569: \ as at the orig point
570: dup orig?
571: 2 pick backedge-locals ! ; immediate
572:
573: \ locals list operations
574:
575: : common-list ( list1 list2 -- list3 ) \ gforth-internal
576: \ list1 and list2 are lists, where the heads are at higher addresses than
577: \ the tail. list3 is the largest sublist of both lists.
578: begin
579: 2dup u<>
580: while
581: 2dup u>
582: if
583: swap
584: then
585: @
586: repeat
587: drop ;
588:
589: : sub-list? ( list1 list2 -- f ) \ gforth-internal
590: \ true iff list1 is a sublist of list2
591: begin
592: 2dup u<
593: while
594: @
595: repeat
596: = ;
597:
598: : list-size ( list -- u ) \ gforth-internal
599: \ size of the locals frame represented by list
600: 0 ( list n )
601: begin
602: over 0<>
603: while
604: over
605: name> >body @ max
606: swap @ swap ( get next )
607: repeat
608: faligned nip ;
609:
610: : set-locals-size-list ( list -- )
611: dup locals-list !
612: list-size locals-size ! ;
613:
614: : check-begin ( list -- )
615: \ warn if list is not a sublist of locals-list
616: locals-list @ sub-list? 0= if
617: \ !! print current position
618: ." compiler was overly optimistic about locals at a BEGIN" cr
619: \ !! print assumption and reality
620: then ;
621:
622: \ Control Flow Stack
623: \ orig, etc. have the following structure:
624: \ type ( defstart, live-orig, dead-orig, dest, do-dest, scopestart) ( TOS )
625: \ address (of the branch or the instruction to be branched to) (second)
626: \ locals-list (valid at address) (third)
627:
628: \ types
629: 0 constant defstart
630: 1 constant live-orig
631: 2 constant dead-orig
632: 3 constant dest \ the loopback branch is always assumed live
633: 4 constant do-dest
634: 5 constant scopestart
635:
636: : def? ( n -- )
637: defstart <> abort" unstructured " ;
638:
639: : orig? ( n -- )
640: dup live-orig <> swap dead-orig <> and abort" expected orig " ;
641:
642: : dest? ( n -- )
643: dest <> abort" expected dest " ;
644:
645: : do-dest? ( n -- )
646: do-dest <> abort" expected do-dest " ;
647:
648: : scope? ( n -- )
649: scopestart <> abort" expected scope " ;
650:
651: : non-orig? ( n -- )
652: dest scopestart 1+ within 0= abort" expected dest, do-dest or scope" ;
653:
654: : cs-item? ( n -- )
655: live-orig scopestart 1+ within 0= abort" expected control flow stack item" ;
656:
657: 3 constant cs-item-size
658:
659: : CS-PICK ( ... u -- ... destu ) \ tools-ext
660: 1+ cs-item-size * 1- >r
661: r@ pick r@ pick r@ pick
662: rdrop
663: dup non-orig? ;
664:
665: : CS-ROLL ( destu/origu .. dest0/orig0 u -- .. dest0/orig0 destu/origu ) \ tools-ext
666: 1+ cs-item-size * 1- >r
667: r@ roll r@ roll r@ roll
668: rdrop
669: dup cs-item? ;
670:
671: : cs-push-part ( -- list addr )
672: locals-list @ here ;
673:
674: : cs-push-orig ( -- orig )
675: cs-push-part dead-code @
676: if
677: dead-orig
678: else
679: live-orig
680: then ;
681:
682: \ Structural Conditionals 12dec92py
683:
684: : ?struc ( flag -- ) abort" unstructured " ;
685: : sys? ( sys -- ) dup 0= ?struc ;
686: : >mark ( -- orig )
687: cs-push-orig 0 , ;
688: : >resolve ( addr -- ) here over - swap ! ;
689: : <resolve ( addr -- ) here - , ;
690:
691: : BUT
692: 1 cs-roll ; immediate restrict
693: : YET
694: 0 cs-pick ; immediate restrict
695:
696: \ Structural Conditionals 12dec92py
697:
698: : AHEAD ( compilation -- orig ; run-time -- ) \ tools-ext
699: POSTPONE branch >mark POSTPONE unreachable ; immediate restrict
700:
701: : IF ( compilation -- orig ; run-time f -- ) \ core
702: POSTPONE ?branch >mark ; immediate restrict
703:
704: : ?DUP-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-if
705: \ This is the preferred alternative to the idiom "?DUP IF", since it can be
706: \ better handled by tools like stack checkers
707: POSTPONE ?dup POSTPONE if ; immediate restrict
708: : ?DUP-0=-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-zero-equals-if
709: POSTPONE ?dup POSTPONE 0= POSTPONE if ; immediate restrict
710:
711: : THEN ( compilation orig -- ; run-time -- ) \ core
712: dup orig?
713: dead-orig =
714: if
715: >resolve drop
716: else
717: dead-code @
718: if
719: >resolve set-locals-size-list dead-code off
720: else \ both live
721: over list-size adjust-locals-size
722: >resolve
723: locals-list @ common-list dup list-size adjust-locals-size
724: locals-list !
725: then
726: then ; immediate restrict
727:
728: ' THEN alias ENDIF ( compilation orig -- ; run-time -- ) \ gforth
729: immediate restrict
730: \ Same as "THEN". This is what you use if your program will be seen by
731: \ people who have not been brought up with Forth (or who have been
732: \ brought up with fig-Forth).
733:
734: : ELSE ( compilation orig1 -- orig2 ; run-time f -- ) \ core
735: POSTPONE ahead
736: 1 cs-roll
737: POSTPONE then ; immediate restrict
738:
739:
740: : BEGIN ( compilation -- dest ; run-time -- ) \ core
741: dead-code @ if
742: \ set up an assumption of the locals visible here. if the
743: \ users want something to be visible, they have to declare
744: \ that using ASSUME-LIVE
745: backedge-locals @ set-locals-size-list
746: then
747: cs-push-part dest
748: dead-code off ; immediate restrict
749:
750: \ AGAIN (the current control flow joins another, earlier one):
751: \ If the dest-locals-list is not a subset of the current locals-list,
752: \ issue a warning (see below). The following code is generated:
753: \ lp+!# (current-local-size - dest-locals-size)
754: \ branch <begin>
755: : AGAIN ( compilation dest -- ; run-time -- ) \ core-ext
756: dest?
757: over list-size adjust-locals-size
758: POSTPONE branch
759: <resolve
760: check-begin
761: POSTPONE unreachable ; immediate restrict
762:
763: \ UNTIL (the current control flow may join an earlier one or continue):
764: \ Similar to AGAIN. The new locals-list and locals-size are the current
765: \ ones. The following code is generated:
766: \ ?branch-lp+!# <begin> (current-local-size - dest-locals-size)
767: : until-like ( list addr xt1 xt2 -- )
768: \ list and addr are a fragment of a cs-item
769: \ xt1 is the conditional branch without lp adjustment, xt2 is with
770: >r >r
771: locals-size @ 2 pick list-size - dup if ( list dest-addr adjustment )
772: r> drop r> compile,
773: swap <resolve ( list adjustment ) ,
774: else ( list dest-addr adjustment )
775: drop
776: r> compile, <resolve
777: r> drop
778: then ( list )
779: check-begin ;
780:
781: : UNTIL ( compilation dest -- ; run-time f -- ) \ core
782: dest? ['] ?branch ['] ?branch-lp+!# until-like ; immediate restrict
783:
784: : WHILE ( compilation dest -- orig dest ; run-time f -- ) \ core
785: POSTPONE if
786: 1 cs-roll ; immediate restrict
787:
788: : REPEAT ( compilation orig dest -- ; run-time -- ) \ core
789: POSTPONE again
790: POSTPONE then ; immediate restrict
791:
792:
793: \ counted loops
794:
795: \ leave poses a little problem here
796: \ we have to store more than just the address of the branch, so the
797: \ traditional linked list approach is no longer viable.
798: \ This is solved by storing the information about the leavings in a
799: \ special stack.
800:
801: \ !! remove the fixed size limit. 'Tis not hard.
802: 20 constant leave-stack-size
803: create leave-stack 60 cells allot
804: Avariable leave-sp leave-stack 3 cells + leave-sp !
805:
806: : clear-leave-stack ( -- )
807: leave-stack leave-sp ! ;
808:
809: \ : leave-empty? ( -- f )
810: \ leave-sp @ leave-stack = ;
811:
812: : >leave ( orig -- )
813: \ push on leave-stack
814: leave-sp @
815: dup [ leave-stack 60 cells + ] Aliteral
816: >= abort" leave-stack full"
817: tuck ! cell+
818: tuck ! cell+
819: tuck ! cell+
820: leave-sp ! ;
821:
822: : leave> ( -- orig )
823: \ pop from leave-stack
824: leave-sp @
825: dup leave-stack <= IF
826: drop 0 0 0 EXIT THEN
827: cell - dup @ swap
828: cell - dup @ swap
829: cell - dup @ swap
830: leave-sp ! ;
831:
832: : DONE ( compilation orig -- ; run-time -- ) \ gforth
833: \ !! the original done had ( addr -- )
834: drop >r drop
835: begin
836: leave>
837: over r@ u>=
838: while
839: POSTPONE then
840: repeat
841: >leave rdrop ; immediate restrict
842:
843: : LEAVE ( compilation -- ; run-time loop-sys -- ) \ core
844: POSTPONE ahead
845: >leave ; immediate restrict
846:
847: : ?LEAVE ( compilation -- ; run-time f | f loop-sys -- ) \ gforth question-leave
848: POSTPONE 0= POSTPONE if
849: >leave ; immediate restrict
850:
851: : DO ( compilation -- do-sys ; run-time w1 w2 -- loop-sys ) \ core
852: POSTPONE (do)
853: POSTPONE begin drop do-dest
854: ( 0 0 0 >leave ) ; immediate restrict
855:
856: : ?do-like ( -- do-sys )
857: ( 0 0 0 >leave )
858: >mark >leave
859: POSTPONE begin drop do-dest ;
860:
861: : ?DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ core-ext question-do
862: POSTPONE (?do) ?do-like ; immediate restrict
863:
864: : +DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ gforth plus-do
865: POSTPONE (+do) ?do-like ; immediate restrict
866:
867: : U+DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ gforth u-plus-do
868: POSTPONE (u+do) ?do-like ; immediate restrict
869:
870: : -DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ gforth minus-do
871: POSTPONE (-do) ?do-like ; immediate restrict
872:
873: : U-DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ gforth u-minus-do
874: POSTPONE (u-do) ?do-like ; immediate restrict
875:
876: : FOR ( compilation -- do-sys ; run-time w -- loop-sys ) \ gforth
877: POSTPONE (for)
878: POSTPONE begin drop do-dest
879: ( 0 0 0 >leave ) ; immediate restrict
880:
881: \ LOOP etc. are just like UNTIL
882:
883: : loop-like ( do-sys xt1 xt2 -- )
884: >r >r 0 cs-pick swap cell - swap 1 cs-roll r> r> rot do-dest?
885: until-like POSTPONE done POSTPONE unloop ;
886:
887: : LOOP ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ core
888: ['] (loop) ['] (loop)-lp+!# loop-like ; immediate restrict
889:
890: : +LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ core plus-loop
891: ['] (+loop) ['] (+loop)-lp+!# loop-like ; immediate restrict
892:
893: \ !! should the compiler warn about +DO..-LOOP?
894: : -LOOP ( compilation do-sys -- ; run-time loop-sys1 u -- | loop-sys2 ) \ gforth minus-loop
895: ['] (-loop) ['] (-loop)-lp+!# loop-like ; immediate restrict
896:
897: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP"
898: \ will iterate as often as "high low ?DO inc S+LOOP". For positive
899: \ increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for
900: \ negative increments.
901: : S+LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ gforth s-plus-loop
902: ['] (s+loop) ['] (s+loop)-lp+!# loop-like ; immediate restrict
903:
904: : NEXT ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ gforth
905: ['] (next) ['] (next)-lp+!# loop-like ; immediate restrict
906:
907: \ Structural Conditionals 12dec92py
908:
909: : EXIT ( compilation -- ; run-time nest-sys -- ) \ core
910: 0 adjust-locals-size
911: POSTPONE ;s
912: POSTPONE unreachable ; immediate restrict
913:
914: : ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth
915: POSTPONE if POSTPONE exit POSTPONE then ; immediate restrict
916:
917: \ Strings 22feb93py
918:
919: : ," ( "string"<"> -- ) [char] " parse
920: here over char+ allot place align ;
921: : "lit ( -- addr )
922: r> r> dup count + aligned >r swap >r ; restrict
923: : (.") "lit count type ; restrict
924: : (S") "lit count ; restrict
925: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
926: postpone (S") here over char+ allot place align ;
927: immediate restrict
928: create s"-buffer /line chars allot
929: : S" ( compilation 'ccc"' -- ; run-time -- c-addr u ) \ core,file s-quote
930: [char] " parse
931: state @
932: IF
933: postpone SLiteral
934: ELSE
935: /line min >r s"-buffer r@ cmove
936: s"-buffer r>
937: THEN ; immediate
938:
939: : ." ( compilation 'ccc"' -- ; run-time -- ) \ core dot-quote
940: state @ IF postpone (.") ," align
941: ELSE [char] " parse type THEN ; immediate
942: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren
943: [char] ) parse 2drop ; immediate
944: : \ ( -- ) \ core-ext backslash
945: blk @
946: IF
947: >in @ c/l / 1+ c/l * >in !
948: EXIT
949: THEN
950: source >in ! drop ; immediate
951:
952: : \G ( -- ) \ gforth backslash
953: POSTPONE \ ; immediate
954:
955: \ error handling 22feb93py
956: \ 'abort thrown out! 11may93jaw
957:
958: : (abort")
959: "lit >r
960: IF
961: r> "error ! -2 throw
962: THEN
963: rdrop ;
964: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
965: postpone (abort") ," ; immediate restrict
966:
967: \ Header states 23feb93py
968:
969: : flag! ( 8b -- )
970: last @ dup 0= abort" last word was headerless"
971: cell+ tuck c@ xor swap c! ;
972: : immediate $20 flag! ;
973: : restrict $40 flag! ;
974: \ ' noop alias restrict
975:
976: \ Header 23feb93py
977:
978: \ input-stream, nextname and noname are quite ugly (passing
979: \ information through global variables), but they are useful for dealing
980: \ with existing/independent defining words
981:
982: defer (header)
983: defer header ( -- ) \ gforth
984: ' (header) IS header
985:
986: : string, ( c-addr u -- ) \ gforth
987: \ puts down string as cstring
988: dup c, here swap chars dup allot move ;
989:
990: : name, ( "name" -- ) \ gforth
991: name name-too-short? name-too-long?
992: string, cfalign ;
993: : input-stream-header ( "name" -- )
994: \ !! this is f83-implementation-dependent
995: align here last ! -1 A,
996: name, $80 flag! ;
997:
998: : input-stream ( -- ) \ general
999: \ switches back to getting the name from the input stream ;
1000: ['] input-stream-header IS (header) ;
1001:
1002: ' input-stream-header IS (header)
1003:
1004: \ !! make that a 2variable
1005: create nextname-buffer 32 chars allot
1006:
1007: : nextname-header ( -- )
1008: \ !! f83-implementation-dependent
1009: nextname-buffer count
1010: align here last ! -1 A,
1011: string, cfalign
1012: $80 flag!
1013: input-stream ;
1014:
1015: \ the next name is given in the string
1016: : nextname ( c-addr u -- ) \ gforth
1017: name-too-long?
1018: nextname-buffer c! ( c-addr )
1019: nextname-buffer count move
1020: ['] nextname-header IS (header) ;
1021:
1022: : noname-header ( -- )
1023: 0 last ! cfalign
1024: input-stream ;
1025:
1026: : noname ( -- ) \ gforth
1027: \ the next defined word remains anonymous. The xt of that word is given by lastxt
1028: ['] noname-header IS (header) ;
1029:
1030: : lastxt ( -- xt ) \ gforth
1031: \ 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
1032: lastcfa @ ;
1033:
1034: : Alias ( cfa "name" -- ) \ gforth
1035: Header reveal , $80 flag! ;
1036:
1037: : name>string ( nfa -- addr count ) \ gforth name-to-string
1038: cell+ count $1F and ;
1039:
1040: Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
1041: : >name ( cfa -- nfa ) \ gforth to-name
1042: $21 cell do
1043: dup i - count $9F and + cfaligned over $80 + = if
1044: i - cell - unloop exit
1045: then
1046: cell +loop
1047: drop ??? ( wouldn't 0 be better? ) ;
1048:
1049: \ threading 17mar93py
1050:
1051: : cfa, ( code-address -- ) \ gforth cfa-comma
1052: here
1053: dup lastcfa !
1054: 0 A, 0 , code-address! ;
1055: : compile, ( xt -- ) \ core-ext compile-comma
1056: A, ;
1057: : !does ( addr -- ) \ gforth store-does
1058: lastxt does-code! ;
1059: : (does>) ( R: addr -- )
1060: r> /does-handler + !does ;
1061: : dodoes, ( -- )
1062: here /does-handler allot does-handler! ;
1063:
1064: : Create ( -- ) \ core
1065: Header reveal dovar: cfa, ;
1066:
1067: \ DOES> 17mar93py
1068:
1069: : DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
1070: state @
1071: IF
1072: ;-hook postpone (does>) ?struc dodoes,
1073: ELSE
1074: align dodoes, here !does ]
1075: THEN
1076: defstart :-hook ; immediate
1077:
1078: \ Create Variable User Constant 17mar93py
1079:
1080: : Variable ( -- ) \ core
1081: Create 0 , ;
1082: : AVariable ( -- ) \ gforth
1083: Create 0 A, ;
1084: : 2VARIABLE ( "name" -- ) \ double
1085: create 0 , 0 , ;
1086:
1087: : User
1088: Variable ;
1089: : AUser
1090: AVariable ;
1091:
1092: : (Constant) Header reveal docon: cfa, ;
1093: : Constant ( w -- ) \ core
1094: (Constant) , ;
1095: : AConstant ( addr -- ) \ gforth
1096: (Constant) A, ;
1097:
1098: : 2Constant ( d -- ) \ double
1099: Create ( w1 w2 "name" -- )
1100: 2,
1101: DOES> ( -- w1 w2 )
1102: 2@ ;
1103:
1104: \ IS Defer What's Defers TO 24feb93py
1105:
1106: : Defer ( -- ) \ gforth
1107: \ !! shouldn't it be initialized with abort or something similar?
1108: Header Reveal dodefer: cfa,
1109: ['] noop A, ;
1110: \ Create ( -- )
1111: \ ['] noop A,
1112: \ DOES> ( ??? )
1113: \ @ execute ;
1114:
1115: : IS ( addr "name" -- ) \ gforth
1116: ' >body
1117: state @
1118: IF postpone ALiteral postpone !
1119: ELSE !
1120: THEN ; immediate
1121: ' IS Alias TO ( addr "name" -- ) \ core-ext
1122: immediate
1123:
1124: : What's ( "name" -- addr ) \ gforth
1125: ' >body
1126: state @
1127: IF
1128: postpone ALiteral postpone @
1129: ELSE
1130: @
1131: THEN ; immediate
1132: : Defers ( "name" -- ) \ gforth
1133: ' >body @ compile, ; immediate
1134:
1135: \ : ; 24feb93py
1136:
1137: defer :-hook ( sys1 -- sys2 )
1138: defer ;-hook ( sys2 -- sys1 )
1139:
1140: : : ( -- colon-sys ) \ core colon
1141: Header docol: cfa, defstart ] :-hook ;
1142: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1143: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1144:
1145: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
1146: 0 last !
1147: here docol: cfa, 0 ] :-hook ;
1148:
1149: \ Search list handling 23feb93py
1150:
1151: AVariable current ( -- addr ) \ gforth
1152:
1153: : last? ( -- false / nfa nfa )
1154: last @ ?dup ;
1155: : (reveal) ( -- )
1156: last?
1157: IF
1158: dup @ 0<
1159: IF
1160: current @ @ over ! current @ !
1161: ELSE
1162: drop
1163: THEN
1164: THEN ;
1165:
1166: \ object oriented search list 17mar93py
1167:
1168: \ word list structure:
1169:
1170: struct
1171: 1 cells: field find-method \ xt: ( c_addr u wid -- name-id )
1172: 1 cells: field reveal-method \ xt: ( -- ) \ used by dofield:, must be field
1173: 1 cells: field rehash-method \ xt: ( wid -- )
1174: \ \ !! what else
1175: end-struct wordlist-map-struct
1176:
1177: struct
1178: 1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
1179: 1 cells: field wordlist-map \ pointer to a wordlist-map-struct
1180: 1 cells: field wordlist-link \ link field to other wordlists
1181: 1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
1182: end-struct wordlist-struct
1183:
1184: : f83find ( addr len wordlist -- nfa / false ) @ (f83find) ;
1185:
1186: \ Search list table: find reveal
1187: Create f83search ' f83find A, ' (reveal) A, ' drop A,
1188:
1189: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
1190: AVariable lookup G forth-wordlist lookup T !
1191: G forth-wordlist current T !
1192:
1193: : (search-wordlist) ( addr count wid -- nfa / false )
1194: dup wordlist-map @ find-method @ execute ;
1195:
1196: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
1197: (search-wordlist) dup IF found THEN ;
1198:
1199: Variable warnings ( -- addr ) \ gforth
1200: G -1 warnings T !
1201:
1202: : check-shadow ( addr count wid -- )
1203: \ prints a warning if the string is already present in the wordlist
1204: \ !! should be refined so the user can suppress the warnings
1205: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
1206: ." redefined " name>string 2dup type
1207: compare 0<> if
1208: ." with " type
1209: else
1210: 2drop
1211: then
1212: space space EXIT
1213: then
1214: 2drop 2drop ;
1215:
1216: : sfind ( c-addr u -- xt n / 0 ) \ gforth
1217: lookup @ search-wordlist ;
1218:
1219: : find ( addr -- cfa +-1 / string false ) \ core,search
1220: \ !! not ANS conformant: returns +-2 for restricted words
1221: dup count sfind dup if
1222: rot drop
1223: then ;
1224:
1225: : reveal ( -- ) \ gforth
1226: last? if
1227: name>string current @ check-shadow
1228: then
1229: current @ wordlist-map @ reveal-method @ execute ;
1230:
1231: : rehash ( wid -- )
1232: dup wordlist-map @ rehash-method @ execute ;
1233:
1234: : ' ( "name" -- addr ) \ core tick
1235: name sfind 0= if -&13 bounce then ;
1236: : ['] ( compilation "name" -- ; run-time --addr ) \ core bracket-tick
1237: ' postpone ALiteral ; immediate
1238: \ Input 13feb93py
1239:
1240: 07 constant #bell ( -- c ) \ gforth
1241: 08 constant #bs ( -- c ) \ gforth
1242: 09 constant #tab ( -- c ) \ gforth
1243: 7F constant #del ( -- c ) \ gforth
1244: 0D constant #cr ( -- c ) \ gforth
1245: \ the newline key code
1246: 0C constant #ff ( -- c ) \ gforth
1247: 0A constant #lf ( -- c ) \ gforth
1248:
1249: : bell #bell emit ;
1250:
1251: \ : backspaces 0 ?DO #bs emit LOOP ;
1252: : >string ( span addr pos1 -- span addr pos1 addr2 len )
1253: over 3 pick 2 pick chars /string ;
1254: : type-rest ( span addr pos1 -- span addr pos1 back )
1255: >string tuck type ;
1256: : (del) ( max span addr pos1 -- max span addr pos2 )
1257: 1- >string over 1+ -rot move
1258: rot 1- -rot #bs emit type-rest bl emit 1+ backspaces ;
1259: : (ins) ( max span addr pos1 char -- max span addr pos2 )
1260: >r >string over 1+ swap move 2dup chars + r> swap c!
1261: rot 1+ -rot type-rest 1- backspaces 1+ ;
1262: : ?del ( max span addr pos1 -- max span addr pos2 0 )
1263: dup IF (del) THEN 0 ;
1264: : (ret) type-rest drop true space ;
1265: : back dup IF 1- #bs emit ELSE #bell emit THEN 0 ;
1266: : forw 2 pick over <> IF 2dup + c@ emit 1+ ELSE #bell emit THEN 0 ;
1267: : eof 2 pick 0= IF bye ELSE (ret) THEN ;
1268:
1269: Create ctrlkeys
1270: ] false false back false eof false forw false
1271: ?del false (ret) false false (ret) false false
1272: false false false false false false false false
1273: false false false false false false false false [
1274:
1275: defer everychar
1276: ' noop IS everychar
1277:
1278: : decode ( max span addr pos1 key -- max span addr pos2 flag )
1279: everychar
1280: dup #del = IF drop #bs THEN \ del is rubout
1281: dup bl < IF cells ctrlkeys + @ execute EXIT THEN
1282: >r 2over = IF rdrop bell 0 EXIT THEN
1283: r> (ins) 0 ;
1284:
1285: \ decode should better use a table for control key actions
1286: \ to define keyboard bindings later
1287:
1288: : accept ( addr len -- len ) \ core
1289: dup 0< IF abs over dup 1 chars - c@ tuck type
1290: \ this allows to edit given strings
1291: ELSE 0 THEN rot over
1292: BEGIN key decode UNTIL
1293: 2drop nip ;
1294:
1295: \ Output 13feb93py
1296:
1297: Defer type ( c-addr u -- ) \ core
1298: \ defer type for a output buffer or fast
1299: \ screen write
1300:
1301: \ : (type) ( addr len -- )
1302: \ bounds ?DO I c@ emit LOOP ;
1303:
1304: ' (type) IS Type
1305:
1306: Defer emit ( c -- ) \ core
1307: ' (Emit) IS Emit
1308:
1309: Defer key ( -- c ) \ core
1310: ' (key) IS key
1311:
1312: \ : form ( -- rows cols ) &24 &80 ;
1313: \ form should be implemented using TERMCAPS or CURSES
1314: \ : rows form drop ;
1315: \ : cols form nip ;
1316:
1317: \ Query 07apr93py
1318:
1319: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1320: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
1321: tib /line
1322: loadfile @ ?dup
1323: IF read-line throw
1324: ELSE loadline @ 0< IF 2drop false EXIT THEN
1325: accept true
1326: THEN
1327: 1 loadline +!
1328: swap #tib ! 0 >in ! ;
1329:
1330: : Query ( -- ) \ core-ext
1331: \ obsolescent
1332: loadfile off blk off refill drop ;
1333:
1334: \ File specifiers 11jun93jaw
1335:
1336:
1337: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
1338: \ 2 c, here char r c, char + c, 0 c,
1339: \ 2 c, here char w c, char + c, 0 c, align
1340: 4 Constant w/o ( -- fam ) \ file w-o
1341: 2 Constant r/w ( -- fam ) \ file r-o
1342: 0 Constant r/o ( -- fam ) \ file r-w
1343:
1344: \ BIN WRITE-LINE 11jun93jaw
1345:
1346: \ : bin dup 1 chars - c@
1347: \ r/o 4 chars + over - dup >r swap move r> ;
1348:
1349: : bin ( fam1 -- fam2 ) \ file
1350: 1 or ;
1351:
1352: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
1353: \ or not unix environments if
1354: \ bin is not selected
1355:
1356: : write-line ( c-addr u fileid -- ior ) \ file
1357: dup >r write-file
1358: ?dup IF
1359: r> drop EXIT
1360: THEN
1361: nl$ count r> write-file ;
1362:
1363: \ include-file 07apr93py
1364:
1365: : push-file ( -- ) r>
1366: loadline @ >r loadfile @ >r
1367: blk @ >r >tib @ >r #tib @ dup >r >tib +! >in @ >r >r ;
1368:
1369: : pop-file ( throw-code -- throw-code )
1370: dup IF
1371: source >in @ loadline @ loadfilename 2@
1372: error-stack dup @ dup 1+
1373: max-errors 1- min error-stack !
1374: 6 * cells + cell+
1375: 5 cells bounds swap DO
1376: I !
1377: -1 cells +LOOP
1378: THEN
1379: r>
1380: r> >in ! r> #tib ! r> >tib ! r> blk !
1381: r> loadfile ! r> loadline ! >r ;
1382:
1383: : read-loop ( i*x -- j*x )
1384: BEGIN refill WHILE interpret REPEAT ;
1385:
1386: : include-file ( i*x fid -- j*x ) \ file
1387: push-file loadfile !
1388: 0 loadline ! blk off ['] read-loop catch
1389: loadfile @ close-file swap 2dup or
1390: pop-file drop throw throw ;
1391:
1392: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
1393:
1394: \ : check-file-prefix ( addr len -- addr' len' flag )
1395: \ dup 0= IF true EXIT THEN
1396: \ over c@ '/ = IF true EXIT THEN
1397: \ over 2 S" ./" compare 0= IF true EXIT THEN
1398: \ over 3 S" ../" compare 0= IF true EXIT THEN
1399: \ over 2 S" ~/" compare 0=
1400: \ IF 1 /string
1401: \ S" HOME" getenv tuck pathfilenamebuf swap move
1402: \ 2dup + >r pathfilenamebuf + swap move
1403: \ pathfilenamebuf r> true
1404: \ ELSE false
1405: \ THEN ;
1406:
1407: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
1408: \ opens a file for reading, searching in the path for it (unless
1409: \ the filename contains a slash); c-addr2 u2 is the full filename
1410: \ (valid until the next call); if the file is not found (or in
1411: \ case of other errors for each try), -38 (non-existant file) is
1412: \ thrown. Opening for other access modes makes little sense, as
1413: \ the path will usually contain dirs that are only readable for
1414: \ the user
1415: \ !! use file-status to determine access mode?
1416: 2dup [char] / scan nip ( 0<> )
1417: if \ the filename contains a slash
1418: 2dup r/o open-file throw ( c-addr1 u1 file-id )
1419: -rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
1420: pathfilenamebuf r> EXIT
1421: then
1422: pathdirs 2@ 0
1423: \ check-file-prefix 0=
1424: \ IF pathdirs 2@ 0
1425: ?DO ( c-addr1 u1 dirnamep )
1426: dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
1427: 2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
1428: pathfilenamebuf over r> + dup >r r/o open-file 0=
1429: IF ( addr u file-id )
1430: nip nip r> rdrop 0 LEAVE
1431: THEN
1432: rdrop drop r> cell+ cell+
1433: LOOP
1434: \ ELSE 2dup open-file throw -rot THEN
1435: 0<> -&38 and throw ( file-id u2 )
1436: pathfilenamebuf swap ;
1437:
1438: create included-files 0 , 0 , ( pointer to and count of included files )
1439: create image-included-files 0 , 0 , ( pointer to and count of included files )
1440: \ included-files points to ALLOCATEd space, while image-included-files
1441: \ points to ALLOTed objects, so it survives a save-system
1442:
1443: : init-included-files ( -- )
1444: image-included-files 2@ 2* cells save-string drop ( addr )
1445: image-included-files 2@ nip included-files 2! ;
1446:
1447: : included? ( c-addr u -- f ) \ gforth
1448: \ true, iff filename c-addr u is in included-files
1449: included-files 2@ 0
1450: ?do ( c-addr u addr )
1451: dup >r 2@ 2over compare 0=
1452: if
1453: 2drop rdrop unloop
1454: true EXIT
1455: then
1456: r> cell+ cell+
1457: loop
1458: 2drop drop false ;
1459:
1460: : add-included-file ( c-addr u -- ) \ gforth
1461: \ add name c-addr u to included-files
1462: included-files 2@ tuck 1+ 2* cells resize throw
1463: swap 2dup 1+ included-files 2!
1464: 2* cells + 2! ;
1465:
1466: : save-string ( addr1 u -- addr2 u ) \ gforth
1467: \ !! not a string, but a memblock word
1468: swap >r
1469: dup allocate throw
1470: swap 2dup r> -rot move ;
1471:
1472: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1473: \ include the file file-id with the name given by c-addr u
1474: loadfilename 2@ >r >r
1475: save-string 2dup loadfilename 2! add-included-file ( file-id )
1476: ['] include-file catch
1477: r> r> loadfilename 2! throw ;
1478:
1479: : included ( i*x addr u -- j*x ) \ file
1480: open-path-file included1 ;
1481:
1482: : required ( i*x addr u -- j*x ) \ gforth
1483: \ include the file with the name given by addr u, if it is not
1484: \ included already. Currently this works by comparing the name of
1485: \ the file (with path) against the names of earlier included
1486: \ files; however, it would probably be better to fstat the file,
1487: \ and compare the device and inode. The advantages would be: no
1488: \ problems with several paths to the same file (e.g., due to
1489: \ links) and we would catch files included with include-file and
1490: \ write a require-file.
1491: open-path-file 2dup included?
1492: if
1493: 2drop close-file throw
1494: else
1495: included1
1496: then ;
1497:
1498: \ HEX DECIMAL 2may93jaw
1499:
1500: : decimal ( -- ) \ core
1501: a base ! ;
1502: : hex ( -- ) \ core-ext
1503: 10 base ! ;
1504:
1505: \ DEPTH 9may93jaw
1506:
1507: : depth ( -- +n ) \ core
1508: sp@ s0 @ swap - cell / ;
1509: : clearstack ( ... -- )
1510: s0 @ sp! ;
1511:
1512: \ INCLUDE 9may93jaw
1513:
1514: : include ( "file" -- ) \ gforth
1515: name included ;
1516:
1517: : require ( "file" -- ) \ gforth
1518: name required ;
1519:
1520: \ RECURSE 17may93jaw
1521:
1522: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1523: lastxt compile, ; immediate restrict
1524: : recursive ( -- ) \ gforth
1525: reveal last off ; immediate
1526:
1527: \ */MOD */ 17may93jaw
1528:
1529: \ !! I think */mod should have the same rounding behaviour as / - anton
1530: : */mod ( n1 n2 n3 -- n4 n5 ) \ core star-slash-mod
1531: >r m* r> sm/rem ;
1532:
1533: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
1534: */mod nip ;
1535:
1536: \ EVALUATE 17may93jaw
1537:
1538: : evaluate ( c-addr len -- ) \ core,block
1539: push-file dup #tib ! >tib @ swap move
1540: >in off blk off loadfile off -1 loadline !
1541: \ BEGIN interpret >in @ #tib @ u>= UNTIL
1542: ['] interpret catch
1543: pop-file throw ;
1544:
1545: : abort ( ?? -- ?? ) \ core,exception-ext
1546: -1 throw ;
1547:
1548: \+ environment? true ENV" CORE"
1549: \ core wordset is now complete!
1550:
1551: \ Quit 13feb93py
1552:
1553: Defer 'quit
1554: Defer .status
1555: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
1556: : (quit) BEGIN .status cr query interpret prompt AGAIN ;
1557: ' (quit) IS 'quit
1558:
1559: \ DOERROR (DOERROR) 13jun93jaw
1560:
1561: 8 Constant max-errors
1562: Variable error-stack 0 error-stack !
1563: max-errors 6 * cells allot
1564: \ format of one cell:
1565: \ source ( addr u )
1566: \ >in
1567: \ line-number
1568: \ Loadfilename ( addr u )
1569:
1570: : dec. ( n -- ) \ gforth
1571: \ print value in decimal representation
1572: base @ decimal swap . base ! ;
1573:
1574: : typewhite ( addr u -- ) \ gforth
1575: \ like type, but white space is printed instead of the characters
1576: bounds ?do
1577: i c@ 9 = if \ check for tab
1578: 9
1579: else
1580: bl
1581: then
1582: emit
1583: loop ;
1584:
1585: DEFER DOERROR
1586:
1587: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
1588: cr error-stack @
1589: IF
1590: ." in file included from "
1591: type ." :" dec. drop 2drop
1592: ELSE
1593: type ." :" dec.
1594: cr dup 2over type cr drop
1595: nip -trailing 1- ( line-start index2 )
1596: 0 >r BEGIN
1597: 2dup + c@ bl > WHILE
1598: r> 1+ >r 1- dup 0< UNTIL THEN 1+
1599: ( line-start index1 )
1600: typewhite
1601: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
1602: [char] ^ emit
1603: loop
1604: THEN
1605: ;
1606:
1607: : (DoError) ( throw-code -- )
1608: loadline @ IF
1609: source >in @ loadline @ 0 0 .error-frame
1610: THEN
1611: error-stack @ 0 ?DO
1612: -1 error-stack +!
1613: error-stack dup @ 6 * cells + cell+
1614: 6 cells bounds DO
1615: I @
1616: cell +LOOP
1617: .error-frame
1618: LOOP
1619: dup -2 =
1620: IF
1621: "error @ ?dup
1622: IF
1623: cr count type
1624: THEN
1625: drop
1626: ELSE
1627: .error
1628: THEN
1629: normal-dp dpp ! ;
1630:
1631: ' (DoError) IS DoError
1632:
1633: : quit ( ?? -- ?? ) \ core
1634: r0 @ rp! handler off >tib @ >r
1635: BEGIN
1636: postpone [
1637: ['] 'quit CATCH dup
1638: WHILE
1639: DoError r@ >tib !
1640: REPEAT
1641: drop r> >tib ! ;
1642:
1643: \ Cold 13feb93py
1644:
1645: \ : .name ( name -- ) cell+ count $1F and type space ;
1646: \ : words listwords @
1647: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
1648:
1649: : cstring>sstring ( cstring -- addr n ) \ gforth cstring-to-sstring
1650: -1 0 scan 0 swap 1+ /string ;
1651: : arg ( n -- addr count ) \ gforth
1652: cells argv @ + @ cstring>sstring ;
1653: : #! postpone \ ; immediate
1654:
1655: Create pathstring 2 cells allot \ string
1656: Create pathdirs 2 cells allot \ dir string array, pointer and count
1657: Variable argv
1658: Variable argc
1659:
1660: 0 Value script? ( -- flag )
1661:
1662: : process-path ( addr1 u1 -- addr2 u2 )
1663: \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
1664: align here >r
1665: BEGIN
1666: over >r [char] : scan
1667: over r> tuck - ( rest-str this-str )
1668: dup
1669: IF
1670: 2dup 1- chars + c@ [char] / <>
1671: IF
1672: 2dup chars + [char] / swap c!
1673: 1+
1674: THEN
1675: 2,
1676: ELSE
1677: 2drop
1678: THEN
1679: dup
1680: WHILE
1681: 1 /string
1682: REPEAT
1683: 2drop
1684: here r> tuck - 2 cells / ;
1685:
1686: : do-option ( addr1 len1 addr2 len2 -- n )
1687: 2swap
1688: 2dup s" -e" compare 0= >r
1689: 2dup s" --evaluate" compare 0= r> or
1690: IF 2drop dup >r ['] evaluate catch
1691: ?dup IF dup >r DoError r> negate (bye) THEN
1692: r> >tib +! 2 EXIT THEN
1693: ." Unknown option: " type cr 2drop 1 ;
1694:
1695: : process-args ( -- )
1696: >tib @ >r
1697: argc @ 1
1698: ?DO
1699: I arg over c@ [char] - <>
1700: IF
1701: required 1
1702: ELSE
1703: I 1+ argc @ = IF s" " ELSE I 1+ arg THEN
1704: do-option
1705: THEN
1706: +LOOP
1707: r> >tib ! ;
1708:
1709: Defer 'cold ' noop IS 'cold
1710:
1711: : cold ( -- ) \ gforth
1712: pathstring 2@ process-path pathdirs 2!
1713: init-included-files
1714: 'cold
1715: argc @ 1 >
1716: IF
1717: true to script?
1718: ['] process-args catch ?dup
1719: IF
1720: dup >r DoError cr r> negate (bye)
1721: THEN
1722: cr
1723: THEN
1724: false to script?
1725: ." GForth " version-string type ." , Copyright (C) 1994 Free Software Foundation, Inc." cr
1726: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
1727: ." Type `bye' to exit"
1728: loadline off quit ;
1729:
1730: : license ( -- ) \ gforth
1731: cr
1732: ." This program is free software; you can redistribute it and/or modify" cr
1733: ." it under the terms of the GNU General Public License as published by" cr
1734: ." the Free Software Foundation; either version 2 of the License, or" cr
1735: ." (at your option) any later version." cr cr
1736:
1737: ." This program is distributed in the hope that it will be useful," cr
1738: ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
1739: ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" cr
1740: ." GNU General Public License for more details." cr cr
1741:
1742: ." You should have received a copy of the GNU General Public License" cr
1743: ." along with this program; if not, write to the Free Software" cr
1744: ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
1745:
1746: : boot ( path **argv argc -- )
1747: argc ! argv ! cstring>sstring pathstring 2! main-task up!
1748: sp@ dup s0 ! $10 + >tib ! #tib off >in off
1749: rp@ r0 ! fp@ f0 ! cold ;
1750:
1751: : bye ( -- ) \ tools-ext
1752: script? 0= IF cr THEN 0 (bye) ;
1753:
1754: \ **argv may be scanned by the C starter to get some important
1755: \ information, as -display and -geometry for an X client FORTH
1756: \ or space and stackspace overrides
1757:
1758: \ 0 arg contains, however, the name of the program.
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to kernal.fs CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [gforth] / gforth