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: \G the code address of a @code{CONSTANT}
55: ['] bl >code-address ;
56:
57: : docol: ( -- addr ) \ gforth
58: \G the code address of a colon definition
59: ['] docon: >code-address ;
60:
61: : dovar: ( -- addr ) \ gforth
62: \G the code address of a @code{CREATE}d word
63: ['] udp >code-address ;
64:
65: : douser: ( -- addr ) \ gforth
66: \G the code address of a @code{USER} variable
67: ['] s0 >code-address ;
68:
69: : dodefer: ( -- addr ) \ gforth
70: \G the code address of a @code{defer}ed word
71: ['] source >code-address ;
72:
73: : dofield: ( -- addr ) \ gforth
74: \G 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 character
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: sp@ >r
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 ! ] \ entry point for signal handler
478: handler @ dup 0= IF
479: 2 (bye)
480: THEN
481: rp!
482: r> handler !
483: r> lp!
484: r> fp!
485: r> swap >r sp! drop r>
486: THEN ;
487:
488: \ Bouncing is very fine,
489: \ programming without wasting time... jaw
490: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
491: \ a throw without data or fp stack restauration
492: ?DUP IF
493: handler @ rp!
494: r> handler !
495: r> lp!
496: rdrop
497: rdrop
498: THEN ;
499:
500: \ ?stack 23feb93py
501:
502: : ?stack ( ?? -- ?? ) \ gforth
503: sp@ s0 @ > IF -4 throw THEN
504: fp@ f0 @ > IF -&45 throw THEN ;
505: \ ?stack should be code -- it touches an empty stack!
506:
507: \ interpret 10mar92py
508:
509: Defer parser
510: Defer name ( -- c-addr count ) \ gforth
511: \ get the next word from the input buffer
512: ' (name) IS name
513: Defer compiler-notfound ( c-addr count -- )
514: Defer interpreter-notfound ( c-addr count -- )
515:
516: : no.extensions ( addr u -- )
517: 2drop -&13 bounce ;
518: ' no.extensions IS compiler-notfound
519: ' no.extensions IS interpreter-notfound
520:
521: : compile-only-error ( ... -- )
522: -&14 throw ;
523:
524: : interpret ( ?? -- ?? ) \ gforth
525: \ interpret/compile the (rest of the) input buffer
526: BEGIN
527: ?stack name dup
528: WHILE
529: parser
530: REPEAT
531: 2drop ;
532:
533: \ interpreter compiler 30apr92py
534:
535: \ not the most efficient implementations of interpreter and compiler
536: : interpreter ( c-addr u -- )
537: 2dup find-name dup
538: if
539: nip nip name>int execute
540: else
541: drop
542: 2dup 2>r snumber?
543: IF
544: 2rdrop
545: ELSE
546: 2r> interpreter-notfound
547: THEN
548: then ;
549:
550: : compiler ( c-addr u -- )
551: 2dup find-name dup
552: if ( c-addr u nfa )
553: nip nip name>comp execute
554: else
555: drop
556: 2dup snumber? dup
557: IF
558: 0>
559: IF
560: swap postpone Literal
561: THEN
562: postpone Literal
563: 2drop
564: ELSE
565: drop compiler-notfound
566: THEN
567: then ;
568:
569: ' interpreter IS parser
570:
571: : [ ( -- ) \ core left-bracket
572: ['] interpreter IS parser state off ; immediate
573: : ] ( -- ) \ core right-bracket
574: ['] compiler IS parser state on ;
575:
576: here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs
577: AConstant locals-list \ acts like a variable that contains
578: \ a linear list of locals names
579:
580:
581: variable dead-code \ true if normal code at "here" would be dead
582: variable backedge-locals
583: \ contains the locals list that BEGIN will assume to be live on
584: \ the back edge if the BEGIN is unreachable from above. Set by
585: \ ASSUME-LIVE, reset by UNREACHABLE.
586:
587: : UNREACHABLE ( -- ) \ gforth
588: \ declares the current point of execution as unreachable
589: dead-code on
590: 0 backedge-locals ! ; immediate
591:
592: : ASSUME-LIVE ( orig -- orig ) \ gforth
593: \ used immediatly before a BEGIN that is not reachable from
594: \ above. causes the BEGIN to assume that the same locals are live
595: \ as at the orig point
596: dup orig?
597: 2 pick backedge-locals ! ; immediate
598:
599: \ Control Flow Stack
600: \ orig, etc. have the following structure:
601: \ type ( defstart, live-orig, dead-orig, dest, do-dest, scopestart) ( TOS )
602: \ address (of the branch or the instruction to be branched to) (second)
603: \ locals-list (valid at address) (third)
604:
605: \ types
606: 0 constant defstart
607: 1 constant live-orig
608: 2 constant dead-orig
609: 3 constant dest \ the loopback branch is always assumed live
610: 4 constant do-dest
611: 5 constant scopestart
612:
613: : def? ( n -- )
614: defstart <> abort" unstructured " ;
615:
616: : orig? ( n -- )
617: dup live-orig <> swap dead-orig <> and abort" expected orig " ;
618:
619: : dest? ( n -- )
620: dest <> abort" expected dest " ;
621:
622: : do-dest? ( n -- )
623: do-dest <> abort" expected do-dest " ;
624:
625: : scope? ( n -- )
626: scopestart <> abort" expected scope " ;
627:
628: : non-orig? ( n -- )
629: dest scopestart 1+ within 0= abort" expected dest, do-dest or scope" ;
630:
631: : cs-item? ( n -- )
632: live-orig scopestart 1+ within 0= abort" expected control flow stack item" ;
633:
634: 3 constant cs-item-size
635:
636: : CS-PICK ( ... u -- ... destu ) \ tools-ext
637: 1+ cs-item-size * 1- >r
638: r@ pick r@ pick r@ pick
639: rdrop
640: dup non-orig? ;
641:
642: : CS-ROLL ( destu/origu .. dest0/orig0 u -- .. dest0/orig0 destu/origu ) \ tools-ext
643: 1+ cs-item-size * 1- >r
644: r@ roll r@ roll r@ roll
645: rdrop
646: dup cs-item? ;
647:
648: : cs-push-part ( -- list addr )
649: locals-list @ here ;
650:
651: : cs-push-orig ( -- orig )
652: cs-push-part dead-code @
653: if
654: dead-orig
655: else
656: live-orig
657: then ;
658:
659: \ Structural Conditionals 12dec92py
660:
661: : ?struc ( flag -- ) abort" unstructured " ;
662: : sys? ( sys -- ) dup 0= ?struc ;
663: : >mark ( -- orig )
664: cs-push-orig 0 , ;
665: : >resolve ( addr -- ) here over - swap ! ;
666: : <resolve ( addr -- ) here - , ;
667:
668: : BUT
669: 1 cs-roll ; immediate restrict
670: : YET
671: 0 cs-pick ; immediate restrict
672:
673: \ Structural Conditionals 12dec92py
674:
675: : AHEAD ( compilation -- orig ; run-time -- ) \ tools-ext
676: POSTPONE branch >mark POSTPONE unreachable ; immediate restrict
677:
678: : IF ( compilation -- orig ; run-time f -- ) \ core
679: POSTPONE ?branch >mark ; immediate restrict
680:
681: : ?DUP-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-if
682: \G This is the preferred alternative to the idiom "?DUP IF", since it can be
683: \G better handled by tools like stack checkers. Besides, it's faster.
684: POSTPONE ?dup-?branch >mark ; immediate restrict
685:
686: : ?DUP-0=-IF ( compilation -- orig ; run-time n -- n| ) \ gforth question-dupe-zero-equals-if
687: POSTPONE ?dup-0=-?branch >mark ; immediate restrict
688:
689: Defer then-like ( orig -- addr )
690: : cs>addr ( orig/dest -- addr ) drop nip ;
691: ' cs>addr IS then-like
692:
693: : THEN ( compilation orig -- ; run-time -- ) \ core
694: dup orig? then-like >resolve ; immediate restrict
695:
696: ' THEN alias ENDIF ( compilation orig -- ; run-time -- ) \ gforth
697: immediate restrict
698: \ Same as "THEN". This is what you use if your program will be seen by
699: \ people who have not been brought up with Forth (or who have been
700: \ brought up with fig-Forth).
701:
702: : ELSE ( compilation orig1 -- orig2 ; run-time f -- ) \ core
703: POSTPONE ahead
704: 1 cs-roll
705: POSTPONE then ; immediate restrict
706:
707: Defer begin-like ( -- )
708: ' noop IS begin-like
709:
710: : BEGIN ( compilation -- dest ; run-time -- ) \ core
711: begin-like cs-push-part dest ; immediate restrict
712:
713: Defer again-like ( dest -- addr )
714: ' nip IS again-like
715:
716: : AGAIN ( compilation dest -- ; run-time -- ) \ core-ext
717: dest? again-like POSTPONE branch <resolve ; immediate restrict
718:
719: Defer until-like
720: : until, ( list addr xt1 xt2 -- ) drop compile, <resolve drop ;
721: ' until, IS until-like
722:
723: : UNTIL ( compilation dest -- ; run-time f -- ) \ core
724: dest? ['] ?branch ['] ?branch-lp+!# until-like ; immediate restrict
725:
726: : WHILE ( compilation dest -- orig dest ; run-time f -- ) \ core
727: POSTPONE if
728: 1 cs-roll ; immediate restrict
729:
730: : REPEAT ( compilation orig dest -- ; run-time -- ) \ core
731: POSTPONE again
732: POSTPONE then ; immediate restrict
733:
734: \ counted loops
735:
736: \ leave poses a little problem here
737: \ we have to store more than just the address of the branch, so the
738: \ traditional linked list approach is no longer viable.
739: \ This is solved by storing the information about the leavings in a
740: \ special stack.
741:
742: \ !! remove the fixed size limit. 'Tis not hard.
743: 20 constant leave-stack-size
744: create leave-stack 60 cells allot
745: Avariable leave-sp leave-stack 3 cells + leave-sp !
746:
747: : clear-leave-stack ( -- )
748: leave-stack leave-sp ! ;
749:
750: \ : leave-empty? ( -- f )
751: \ leave-sp @ leave-stack = ;
752:
753: : >leave ( orig -- )
754: \ push on leave-stack
755: leave-sp @
756: dup [ leave-stack 60 cells + ] Aliteral
757: >= abort" leave-stack full"
758: tuck ! cell+
759: tuck ! cell+
760: tuck ! cell+
761: leave-sp ! ;
762:
763: : leave> ( -- orig )
764: \ pop from leave-stack
765: leave-sp @
766: dup leave-stack <= IF
767: drop 0 0 0 EXIT THEN
768: cell - dup @ swap
769: cell - dup @ swap
770: cell - dup @ swap
771: leave-sp ! ;
772:
773: : DONE ( compilation orig -- ; run-time -- ) \ gforth
774: \ !! the original done had ( addr -- )
775: drop >r drop
776: begin
777: leave>
778: over r@ u>=
779: while
780: POSTPONE then
781: repeat
782: >leave rdrop ; immediate restrict
783:
784: : LEAVE ( compilation -- ; run-time loop-sys -- ) \ core
785: POSTPONE ahead
786: >leave ; immediate restrict
787:
788: : ?LEAVE ( compilation -- ; run-time f | f loop-sys -- ) \ gforth question-leave
789: POSTPONE 0= POSTPONE if
790: >leave ; immediate restrict
791:
792: : DO ( compilation -- do-sys ; run-time w1 w2 -- loop-sys ) \ core
793: POSTPONE (do)
794: POSTPONE begin drop do-dest
795: ( 0 0 0 >leave ) ; immediate restrict
796:
797: : ?do-like ( -- do-sys )
798: ( 0 0 0 >leave )
799: >mark >leave
800: POSTPONE begin drop do-dest ;
801:
802: : ?DO ( compilation -- do-sys ; run-time w1 w2 -- | loop-sys ) \ core-ext question-do
803: POSTPONE (?do) ?do-like ; immediate restrict
804:
805: : +DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys ) \ gforth plus-do
806: POSTPONE (+do) ?do-like ; immediate restrict
807:
808: : U+DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys ) \ gforth u-plus-do
809: POSTPONE (u+do) ?do-like ; immediate restrict
810:
811: : -DO ( compilation -- do-sys ; run-time n1 n2 -- | loop-sys ) \ gforth minus-do
812: POSTPONE (-do) ?do-like ; immediate restrict
813:
814: : U-DO ( compilation -- do-sys ; run-time u1 u2 -- | loop-sys ) \ gforth u-minus-do
815: POSTPONE (u-do) ?do-like ; immediate restrict
816:
817: : FOR ( compilation -- do-sys ; run-time u -- loop-sys ) \ gforth
818: POSTPONE (for)
819: POSTPONE begin drop do-dest
820: ( 0 0 0 >leave ) ; immediate restrict
821:
822: \ LOOP etc. are just like UNTIL
823:
824: : loop-like ( do-sys xt1 xt2 -- )
825: >r >r 0 cs-pick swap cell - swap 1 cs-roll r> r> rot do-dest?
826: until-like POSTPONE done POSTPONE unloop ;
827:
828: : LOOP ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ core
829: ['] (loop) ['] (loop)-lp+!# loop-like ; immediate restrict
830:
831: : +LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ core plus-loop
832: ['] (+loop) ['] (+loop)-lp+!# loop-like ; immediate restrict
833:
834: \ !! should the compiler warn about +DO..-LOOP?
835: : -LOOP ( compilation do-sys -- ; run-time loop-sys1 u -- | loop-sys2 ) \ gforth minus-loop
836: ['] (-loop) ['] (-loop)-lp+!# loop-like ; immediate restrict
837:
838: \ A symmetric version of "+LOOP". I.e., "-high -low ?DO -inc S+LOOP"
839: \ will iterate as often as "high low ?DO inc S+LOOP". For positive
840: \ increments it behaves like "+LOOP". Use S+LOOP instead of +LOOP for
841: \ negative increments.
842: : S+LOOP ( compilation do-sys -- ; run-time loop-sys1 n -- | loop-sys2 ) \ gforth s-plus-loop
843: ['] (s+loop) ['] (s+loop)-lp+!# loop-like ; immediate restrict
844:
845: : NEXT ( compilation do-sys -- ; run-time loop-sys1 -- | loop-sys2 ) \ gforth
846: ['] (next) ['] (next)-lp+!# loop-like ; immediate restrict
847:
848: \ Structural Conditionals 12dec92py
849:
850: Defer exit-like ( -- )
851: ' noop IS exit-like
852:
853: : EXIT ( compilation -- ; run-time nest-sys -- ) \ core
854: exit-like
855: POSTPONE ;s
856: POSTPONE unreachable ; immediate restrict
857:
858: : ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth
859: POSTPONE if POSTPONE exit POSTPONE then ; immediate restrict
860:
861: \ Strings 22feb93py
862:
863: : ," ( "string"<"> -- ) [char] " parse
864: here over char+ allot place align ;
865: : "lit ( -- addr )
866: r> r> dup count + aligned >r swap >r ;
867: : (.") "lit count type ;
868: : (S") "lit count ;
869: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
870: postpone (S") here over char+ allot place align ;
871: immediate restrict
872: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file paren
873: BEGIN
874: >in @ [char] ) parse nip >in @ rot - =
875: WHILE
876: loadfile @ IF
877: refill 0= abort" missing ')' in paren comment"
878: THEN
879: REPEAT ; immediate
880: : \ ( -- ) \ core-ext backslash
881: blk @
882: IF
883: >in @ c/l / 1+ c/l * >in !
884: EXIT
885: THEN
886: source >in ! drop ; immediate
887:
888: : \G ( -- ) \ gforth backslash
889: POSTPONE \ ; immediate
890:
891: \ error handling 22feb93py
892: \ 'abort thrown out! 11may93jaw
893:
894: : (abort")
895: "lit >r
896: IF
897: r> "error ! -2 throw
898: THEN
899: rdrop ;
900: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
901: postpone (abort") ," ; immediate restrict
902:
903: \ Header states 23feb93py
904:
905: : cset ( bmask c-addr -- )
906: tuck c@ or swap c! ;
907: : creset ( bmask c-addr -- )
908: tuck c@ swap invert and swap c! ;
909: : ctoggle ( bmask c-addr -- )
910: tuck c@ xor swap c! ;
911:
912: : lastflags ( -- c-addr )
913: \ the address of the flags byte in the last header
914: \ aborts if the last defined word was headerless
915: last @ dup 0= abort" last word was headerless" cell+ ;
916:
917: : immediate ( -- ) \ core
918: immediate-mask lastflags cset ;
919: : restrict ( -- ) \ gforth
920: restrict-mask lastflags cset ;
921: ' restrict alias compile-only ( -- ) \ gforth
922:
923: \ Header 23feb93py
924:
925: \ input-stream, nextname and noname are quite ugly (passing
926: \ information through global variables), but they are useful for dealing
927: \ with existing/independent defining words
928:
929: defer (header)
930: defer header ( -- ) \ gforth
931: ' (header) IS header
932:
933: : string, ( c-addr u -- ) \ gforth
934: \G puts down string as cstring
935: dup c, here swap chars dup allot move ;
936:
937: : header, ( c-addr u -- ) \ gforth
938: name-too-long?
939: align here last !
940: current @ 1 or A, \ link field; before revealing, it contains the
941: \ tagged reveal-into wordlist
942: string, cfalign
943: alias-mask lastflags cset ;
944:
945: : input-stream-header ( "name" -- )
946: name name-too-short? header, ;
947: : input-stream ( -- ) \ general
948: \G switches back to getting the name from the input stream ;
949: ['] input-stream-header IS (header) ;
950:
951: ' input-stream-header IS (header)
952:
953: \ !! make that a 2variable
954: create nextname-buffer 32 chars allot
955:
956: : nextname-header ( -- )
957: nextname-buffer count header,
958: input-stream ;
959:
960: \ the next name is given in the string
961: : nextname ( c-addr u -- ) \ gforth
962: name-too-long?
963: nextname-buffer c! ( c-addr )
964: nextname-buffer count move
965: ['] nextname-header IS (header) ;
966:
967: : noname-header ( -- )
968: 0 last ! cfalign
969: input-stream ;
970:
971: : noname ( -- ) \ gforth
972: \ the next defined word remains anonymous. The xt of that word is given by lastxt
973: ['] noname-header IS (header) ;
974:
975: : lastxt ( -- xt ) \ gforth
976: \ 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
977: lastcfa @ ;
978:
979: : Alias ( cfa "name" -- ) \ gforth
980: Header reveal
981: alias-mask lastflags creset
982: dup A, lastcfa ! ;
983:
984: : name>string ( nfa -- addr count ) \ gforth name-to-string
985: cell+ count $1F and ;
986:
987: Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
988: : >name ( cfa -- nfa ) \ gforth to-name
989: $21 cell do
990: dup i - count $9F and + cfaligned over alias-mask + = if
991: i - cell - unloop exit
992: then
993: cell +loop
994: drop ??? ( wouldn't 0 be better? ) ;
995:
996: \ threading 17mar93py
997:
998: : cfa, ( code-address -- ) \ gforth cfa-comma
999: here
1000: dup lastcfa !
1001: 0 A, 0 , code-address! ;
1002: : compile, ( xt -- ) \ core-ext compile-comma
1003: A, ;
1004: : !does ( addr -- ) \ gforth store-does
1005: lastxt does-code! ;
1006: : (does>) ( R: addr -- )
1007: r> /does-handler + !does ;
1008: : dodoes, ( -- )
1009: here /does-handler allot does-handler! ;
1010:
1011: : Create ( "name" -- ) \ core
1012: Header reveal dovar: cfa, ;
1013:
1014: \ Create Variable User Constant 17mar93py
1015:
1016: : Variable ( "name" -- ) \ core
1017: Create 0 , ;
1018: : AVariable ( "name" -- ) \ gforth
1019: Create 0 A, ;
1020: : 2VARIABLE ( "name" -- ) \ double
1021: create 0 , 0 , ;
1022:
1023: : User ( "name" -- ) \ gforth
1024: Variable ;
1025: : AUser ( "name" -- ) \ gforth
1026: AVariable ;
1027:
1028: : (Constant) Header reveal docon: cfa, ;
1029: : Constant ( w "name" -- ) \ core
1030: \G Defines constant @var{name}
1031: \G
1032: \G @var{name} execution: @var{-- w}
1033: (Constant) , ;
1034: : AConstant ( addr "name" -- ) \ gforth
1035: (Constant) A, ;
1036:
1037: : 2Constant ( w1 w2 "name" -- ) \ double
1038: Create ( w1 w2 "name" -- )
1039: 2,
1040: DOES> ( -- w1 w2 )
1041: 2@ ;
1042:
1043: \ IS Defer What's Defers TO 24feb93py
1044:
1045: : Defer ( "name" -- ) \ gforth
1046: \ !! shouldn't it be initialized with abort or something similar?
1047: Header Reveal dodefer: cfa,
1048: ['] noop A, ;
1049: \ Create ( -- )
1050: \ ['] noop A,
1051: \ DOES> ( ??? )
1052: \ perform ;
1053:
1054: : Defers ( "name" -- ) \ gforth
1055: ' >body @ compile, ; immediate
1056:
1057: \ : ; 24feb93py
1058:
1059: defer :-hook ( sys1 -- sys2 )
1060: defer ;-hook ( sys2 -- sys1 )
1061:
1062: : : ( "name" -- colon-sys ) \ core colon
1063: Header docol: cfa, defstart ] :-hook ;
1064: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1065: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1066:
1067: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
1068: 0 last !
1069: cfalign here docol: cfa, 0 ] :-hook ;
1070:
1071: \ Search list handling 23feb93py
1072:
1073: AVariable current ( -- addr ) \ gforth
1074:
1075: : last? ( -- false / nfa nfa )
1076: last @ ?dup ;
1077: : (reveal) ( nfa wid -- )
1078: ( wid>wordlist-id ) dup >r
1079: @ over ( name>link ) !
1080: r> ! ;
1081:
1082: \ object oriented search list 17mar93py
1083:
1084: \ word list structure:
1085:
1086: struct
1087: 1 cells: field find-method \ xt: ( c_addr u wid -- name-id )
1088: 1 cells: field reveal-method \ xt: ( nfa wid -- ) \ used by dofield:, must be field
1089: 1 cells: field rehash-method \ xt: ( wid -- )
1090: \ \ !! what else
1091: end-struct wordlist-map-struct
1092:
1093: struct
1094: 1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
1095: 1 cells: field wordlist-map \ pointer to a wordlist-map-struct
1096: 1 cells: field wordlist-link \ link field to other wordlists
1097: 1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
1098: end-struct wordlist-struct
1099:
1100: : f83find ( addr len wordlist -- nfa / false )
1101: ( wid>wordlist-id ) @ (f83find) ;
1102:
1103: \ Search list table: find reveal
1104: Create f83search ( -- wordlist-map )
1105: ' f83find A, ' (reveal) A, ' drop A,
1106:
1107: Create forth-wordlist NIL A, G f83search T A, NIL A, NIL A,
1108: AVariable lookup G forth-wordlist lookup T !
1109: G forth-wordlist current T !
1110:
1111: \ higher level parts of find
1112:
1113: ( struct )
1114: 0 >body cell
1115: 1 cells: field interpret/compile-int
1116: 1 cells: field interpret/compile-comp
1117: end-struct interpret/compile-struct
1118:
1119: : interpret/compile? ( xt -- flag )
1120: >does-code ['] S" >does-code = ;
1121:
1122: : (cfa>int) ( cfa -- xt )
1123: dup interpret/compile?
1124: if
1125: interpret/compile-int @
1126: then ;
1127:
1128: : (x>int) ( cfa b -- xt )
1129: \ get interpretation semantics of name
1130: restrict-mask and
1131: if
1132: drop ['] compile-only-error
1133: else
1134: (cfa>int)
1135: then ;
1136:
1137: : name>int ( nfa -- xt ) \ gforth
1138: (name>x) (x>int) ;
1139:
1140: : name?int ( nfa -- xt ) \ gforth
1141: \G like name>int, but throws an error if compile-only
1142: (name>x) restrict-mask and
1143: if
1144: compile-only-error \ does not return
1145: then
1146: (cfa>int) ;
1147:
1148: : name>comp ( nfa -- w xt ) \ gforth
1149: \G get compilation semantics of name
1150: (name>x) >r dup interpret/compile?
1151: if
1152: interpret/compile-comp @
1153: then
1154: r> immediate-mask and if
1155: ['] execute
1156: else
1157: ['] compile,
1158: then ;
1159:
1160: : (search-wordlist) ( addr count wid -- nfa / false )
1161: dup wordlist-map @ find-method perform ;
1162:
1163: : flag-sign ( f -- 1|-1 )
1164: \ true becomes 1, false -1
1165: 0= 2* 1+ ;
1166:
1167: : (name>intn) ( nfa -- xt +-1 )
1168: (name>x) tuck (x>int) ( b xt )
1169: swap immediate-mask and flag-sign ;
1170:
1171: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
1172: \ xt is the interpretation semantics
1173: (search-wordlist) dup if
1174: (name>intn)
1175: then ;
1176:
1177: : find-name ( c-addr u -- nfa/0 )
1178: lookup @ (search-wordlist) ;
1179:
1180: : sfind ( c-addr u -- 0 / xt +-1 ) \ gforth-obsolete
1181: find-name dup
1182: if ( nfa )
1183: state @
1184: if
1185: name>comp ['] execute = flag-sign
1186: else
1187: (name>intn)
1188: then
1189: then ;
1190:
1191: : find ( c-addr -- xt +-1 / c-addr 0 ) \ core
1192: dup count sfind dup
1193: if
1194: rot drop
1195: then ;
1196:
1197: : (') ( "name" -- nfa ) \ gforth
1198: name find-name dup 0=
1199: IF
1200: drop -&13 bounce
1201: THEN ;
1202:
1203: : [(')] ( compilation "name" -- ; run-time -- nfa ) \ gforth bracket-paren-tick
1204: (') postpone ALiteral ; immediate restrict
1205:
1206: : ' ( "name" -- xt ) \ core tick
1207: (') name?int ;
1208: : ['] ( compilation "name" -- ; run-time -- xt ) \ core bracket-tick
1209: ' postpone ALiteral ; immediate restrict
1210:
1211: : COMP' ( "name" -- w xt ) \ gforth c-tick
1212: (') name>comp ;
1213: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1214: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
1215:
1216: \ reveal words
1217:
1218: Variable warnings ( -- addr ) \ gforth
1219: G -1 warnings T !
1220:
1221: : check-shadow ( addr count wid -- )
1222: \G prints a warning if the string is already present in the wordlist
1223: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
1224: ." redefined " name>string 2dup type
1225: compare 0<> if
1226: ." with " type
1227: else
1228: 2drop
1229: then
1230: space space EXIT
1231: then
1232: 2drop 2drop ;
1233:
1234: : reveal ( -- ) \ gforth
1235: last?
1236: if \ the last word has a header
1237: dup ( name>link ) @ 1 and
1238: if \ it is still hidden
1239: dup ( name>link ) @ 1 xor ( nfa wid )
1240: 2dup >r name>string r> check-shadow ( nfa wid )
1241: dup wordlist-map @ reveal-method perform
1242: then
1243: then ;
1244:
1245: : rehash ( wid -- )
1246: dup wordlist-map @ rehash-method perform ;
1247:
1248: \ Input 13feb93py
1249:
1250: 07 constant #bell ( -- c ) \ gforth
1251: 08 constant #bs ( -- c ) \ gforth
1252: 09 constant #tab ( -- c ) \ gforth
1253: 7F constant #del ( -- c ) \ gforth
1254: 0D constant #cr ( -- c ) \ gforth
1255: \ the newline key code
1256: 0C constant #ff ( -- c ) \ gforth
1257: 0A constant #lf ( -- c ) \ gforth
1258:
1259: : bell #bell emit ;
1260: : cr ( -- ) \ core
1261: \ emit a newline
1262: #lf ( sic! ) emit ;
1263:
1264: \ : backspaces 0 ?DO #bs emit LOOP ;
1265:
1266: : (ins) ( max span addr pos1 key -- max span addr pos2 )
1267: >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
1268: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
1269: dup IF
1270: #bs emit bl emit #bs emit 1- rot 1- -rot
1271: THEN false ;
1272: : (ret) true space ;
1273:
1274: Create ctrlkeys
1275: ] false false false false false false false false
1276: (bs) false (ret) false false (ret) false false
1277: false false false false false false false false
1278: false false false false false false false false [
1279:
1280: defer insert-char
1281: ' (ins) IS insert-char
1282: defer everychar
1283: ' noop IS everychar
1284:
1285: : decode ( max span addr pos1 key -- max span addr pos2 flag )
1286: everychar
1287: dup #del = IF drop #bs THEN \ del is rubout
1288: dup bl < IF cells ctrlkeys + perform EXIT THEN
1289: >r 2over = IF rdrop bell 0 EXIT THEN
1290: r> insert-char 0 ;
1291:
1292: : accept ( addr len -- len ) \ core
1293: dup 0< IF abs over dup 1 chars - c@ tuck type
1294: \ this allows to edit given strings
1295: ELSE 0 THEN rot over
1296: BEGIN key decode UNTIL
1297: 2drop nip ;
1298:
1299: \ Output 13feb93py
1300:
1301: : (type) ( c-addr u -- ) \ gforth
1302: outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1303: ;
1304:
1305: Defer type ( c-addr u -- ) \ core
1306: \ defer type for a output buffer or fast
1307: \ screen write
1308:
1309: ' (type) IS Type
1310:
1311: : (emit) ( c -- ) \ gforth
1312: outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
1313: ;
1314:
1315: Defer emit ( c -- ) \ core
1316: ' (Emit) IS Emit
1317:
1318: Defer key ( -- c ) \ core
1319: ' (key) IS key
1320:
1321: \ Query 07apr93py
1322:
1323: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1324: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
1325: tib /line
1326: loadfile @ ?dup
1327: IF read-line throw
1328: ELSE sourceline# 0< IF 2drop false EXIT THEN
1329: accept true
1330: THEN
1331: 1 loadline +!
1332: swap #tib ! 0 >in ! ;
1333:
1334: : Query ( -- ) \ core-ext
1335: \G obsolescent
1336: loadfile off blk off refill drop ;
1337:
1338: \ File specifiers 11jun93jaw
1339:
1340:
1341: \ 1 c, here char r c, 0 c, 0 c, 0 c, char b c, 0 c,
1342: \ 2 c, here char r c, char + c, 0 c,
1343: \ 2 c, here char w c, char + c, 0 c, align
1344: 4 Constant w/o ( -- fam ) \ file w-o
1345: 2 Constant r/w ( -- fam ) \ file r-w
1346: 0 Constant r/o ( -- fam ) \ file r-o
1347:
1348: \ BIN WRITE-LINE 11jun93jaw
1349:
1350: \ : bin dup 1 chars - c@
1351: \ r/o 4 chars + over - dup >r swap move r> ;
1352:
1353: : bin ( fam1 -- fam2 ) \ file
1354: 1 or ;
1355:
1356: create nl$ 1 c, A c, 0 c, \ gnu includes usually a cr in dos
1357: \ or not unix environments if
1358: \ bin is not selected
1359:
1360: : write-line ( c-addr u fileid -- ior ) \ file
1361: dup >r write-file
1362: ?dup IF
1363: r> drop EXIT
1364: THEN
1365: nl$ count r> write-file ;
1366:
1367: \ include-file 07apr93py
1368:
1369: : push-file ( -- ) r>
1370: sourceline# >r loadfile @ >r
1371: blk @ >r tibstack @ >r >tib @ >r #tib @ >r
1372: >tib @ tibstack @ = IF r@ tibstack +! THEN
1373: tibstack @ >tib ! >in @ >r >r ;
1374:
1375: : pop-file ( throw-code -- throw-code )
1376: dup IF
1377: source >in @ sourceline# sourcefilename
1378: error-stack dup @ dup 1+
1379: max-errors 1- min error-stack !
1380: 6 * cells + cell+
1381: 5 cells bounds swap DO
1382: I !
1383: -1 cells +LOOP
1384: THEN
1385: r>
1386: r> >in ! r> #tib ! r> >tib ! r> tibstack ! r> blk !
1387: r> loadfile ! r> loadline ! >r ;
1388:
1389: : read-loop ( i*x -- j*x )
1390: BEGIN refill WHILE interpret REPEAT ;
1391:
1392: : include-file ( i*x fid -- j*x ) \ file
1393: push-file loadfile !
1394: 0 loadline ! blk off ['] read-loop catch
1395: loadfile @ close-file swap 2dup or
1396: pop-file drop throw throw ;
1397:
1398: create pathfilenamebuf 256 chars allot \ !! make this grow on demand
1399:
1400: \ : check-file-prefix ( addr len -- addr' len' flag )
1401: \ dup 0= IF true EXIT THEN
1402: \ over c@ '/ = IF true EXIT THEN
1403: \ over 2 S" ./" compare 0= IF true EXIT THEN
1404: \ over 3 S" ../" compare 0= IF true EXIT THEN
1405: \ over 2 S" ~/" compare 0=
1406: \ IF 1 /string
1407: \ S" HOME" getenv tuck pathfilenamebuf swap move
1408: \ 2dup + >r pathfilenamebuf + swap move
1409: \ pathfilenamebuf r> true
1410: \ ELSE false
1411: \ THEN ;
1412:
1413: : absolut-path? ( addr u -- flag ) \ gforth
1414: \G a path is absolute, if it starts with a / or a ~ (~ expansion),
1415: \G or if it is in the form ./* or ../*, extended regexp: ^[/~]|./|../
1416: \G Pathes simply containing a / are not absolute!
1417: over c@ '/ = >r
1418: over c@ '~ = >r
1419: 2dup 2 min S" ./" compare 0= >r
1420: 3 min S" ../" compare 0=
1421: r> r> r> or or or ;
1422: \ [char] / scan nip 0<> ;
1423:
1424: : open-path-file ( c-addr1 u1 -- file-id c-addr2 u2 ) \ gforth
1425: \G opens a file for reading, searching in the path for it (unless
1426: \G the filename contains a slash); c-addr2 u2 is the full filename
1427: \G (valid until the next call); if the file is not found (or in
1428: \G case of other errors for each try), -38 (non-existant file) is
1429: \G thrown. Opening for other access modes makes little sense, as
1430: \G the path will usually contain dirs that are only readable for
1431: \G the user
1432: \ !! use file-status to determine access mode?
1433: 2dup absolut-path?
1434: if \ the filename contains a slash
1435: 2dup r/o open-file throw ( c-addr1 u1 file-id )
1436: -rot >r pathfilenamebuf r@ cmove ( file-id R: u1 )
1437: pathfilenamebuf r> EXIT
1438: then
1439: pathdirs 2@ 0
1440: \ check-file-prefix 0=
1441: \ IF pathdirs 2@ 0
1442: ?DO ( c-addr1 u1 dirnamep )
1443: dup >r 2@ dup >r pathfilenamebuf swap cmove ( addr u )
1444: 2dup pathfilenamebuf r@ chars + swap cmove ( addr u )
1445: pathfilenamebuf over r> + dup >r r/o open-file 0=
1446: IF ( addr u file-id )
1447: nip nip r> rdrop 0 LEAVE
1448: THEN
1449: rdrop drop r> cell+ cell+
1450: LOOP
1451: \ ELSE 2dup open-file throw -rot THEN
1452: 0<> -&38 and throw ( file-id u2 )
1453: pathfilenamebuf swap ;
1454:
1455: create included-files 0 , 0 , ( pointer to and count of included files )
1456: here ," the terminal" dup c@ swap 1 + swap , A, here 2 cells -
1457: create image-included-files 1 , A, ( pointer to and count of included files )
1458: \ included-files points to ALLOCATEd space, while image-included-files
1459: \ points to ALLOTed objects, so it survives a save-system
1460:
1461: : loadfilename ( -- a-addr )
1462: \G a-addr 2@ produces the current file name ( c-addr u )
1463: included-files 2@ drop loadfilename# @ 2* cells + ;
1464:
1465: : sourcefilename ( -- c-addr u ) \ gforth
1466: \G the name of the source file which is currently the input
1467: \G source. The result is valid only while the file is being
1468: \G loaded. If the current input source is no (stream) file, the
1469: \G result is undefined.
1470: loadfilename 2@ ;
1471:
1472: : sourceline# ( -- u ) \ gforth sourceline-number
1473: \G the line number of the line that is currently being interpreted
1474: \G from a (stream) file. The first line has the number 1. If the
1475: \G current input source is no (stream) file, the result is
1476: \G undefined.
1477: loadline @ ;
1478:
1479: : init-included-files ( -- )
1480: image-included-files 2@ 2* cells save-mem drop ( addr )
1481: image-included-files 2@ nip included-files 2! ;
1482:
1483: : included? ( c-addr u -- f ) \ gforth
1484: \G true, iff filename c-addr u is in included-files
1485: included-files 2@ 0
1486: ?do ( c-addr u addr )
1487: dup >r 2@ 2over compare 0=
1488: if
1489: 2drop rdrop unloop
1490: true EXIT
1491: then
1492: r> cell+ cell+
1493: loop
1494: 2drop drop false ;
1495:
1496: : add-included-file ( c-addr u -- ) \ gforth
1497: \G add name c-addr u to included-files
1498: included-files 2@ 2* cells 2 cells extend-mem
1499: 2/ cell / included-files 2!
1500: 2! ;
1501: \ included-files 2@ tuck 1+ 2* cells resize throw
1502: \ swap 2dup 1+ included-files 2!
1503: \ 2* cells + 2! ;
1504:
1505: : included1 ( i*x file-id c-addr u -- j*x ) \ gforth
1506: \G include the file file-id with the name given by c-addr u
1507: loadfilename# @ >r
1508: save-mem add-included-file ( file-id )
1509: included-files 2@ nip 1- loadfilename# !
1510: ['] include-file catch
1511: r> loadfilename# !
1512: throw ;
1513:
1514: : included ( i*x addr u -- j*x ) \ file
1515: open-path-file included1 ;
1516:
1517: : required ( i*x addr u -- j*x ) \ gforth
1518: \G include the file with the name given by addr u, if it is not
1519: \G included already. Currently this works by comparing the name of
1520: \G the file (with path) against the names of earlier included
1521: \G files; however, it would probably be better to fstat the file,
1522: \G and compare the device and inode. The advantages would be: no
1523: \G problems with several paths to the same file (e.g., due to
1524: \G links) and we would catch files included with include-file and
1525: \G write a require-file.
1526: open-path-file 2dup included?
1527: if
1528: 2drop close-file throw
1529: else
1530: included1
1531: then ;
1532:
1533: \ HEX DECIMAL 2may93jaw
1534:
1535: : decimal ( -- ) \ core
1536: a base ! ;
1537: : hex ( -- ) \ core-ext
1538: 10 base ! ;
1539:
1540: \ DEPTH 9may93jaw
1541:
1542: : depth ( -- +n ) \ core
1543: sp@ s0 @ swap - cell / ;
1544: : clearstack ( ... -- )
1545: s0 @ sp! ;
1546:
1547: \ INCLUDE 9may93jaw
1548:
1549: : include ( "file" -- ) \ gforth
1550: name included ;
1551:
1552: : require ( "file" -- ) \ gforth
1553: name required ;
1554:
1555: \ RECURSE 17may93jaw
1556:
1557: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1558: lastxt compile, ; immediate restrict
1559: ' reveal alias recursive ( -- ) \ gforth
1560: immediate
1561:
1562: \ */MOD */ 17may93jaw
1563:
1564: \ !! I think */mod should have the same rounding behaviour as / - anton
1565: : */mod ( n1 n2 n3 -- n4 n5 ) \ core star-slash-mod
1566: >r m* r> sm/rem ;
1567:
1568: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
1569: */mod nip ;
1570:
1571: \ EVALUATE 17may93jaw
1572:
1573: : evaluate ( c-addr len -- ) \ core,block
1574: push-file #tib ! >tib !
1575: >in off blk off loadfile off -1 loadline !
1576: ['] interpret catch
1577: pop-file throw ;
1578:
1579: : abort ( ?? -- ?? ) \ core,exception-ext
1580: -1 throw ;
1581:
1582: \+ environment? true ENV" CORE"
1583: \ core wordset is now complete!
1584:
1585: \ Quit 13feb93py
1586:
1587: Defer 'quit
1588: Defer .status
1589: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
1590: : (quit) BEGIN .status cr query interpret prompt AGAIN ;
1591: ' (quit) IS 'quit
1592:
1593: \ DOERROR (DOERROR) 13jun93jaw
1594:
1595: 8 Constant max-errors
1596: Variable error-stack 0 error-stack !
1597: max-errors 6 * cells allot
1598: \ format of one cell:
1599: \ source ( addr u )
1600: \ >in
1601: \ line-number
1602: \ Loadfilename ( addr u )
1603:
1604: : dec. ( n -- ) \ gforth
1605: \ print value in decimal representation
1606: base @ decimal swap . base ! ;
1607:
1608: : hex. ( u -- ) \ gforth
1609: \ print value as unsigned hex number
1610: '$ emit base @ swap hex u. base ! ;
1611:
1612: : typewhite ( addr u -- ) \ gforth
1613: \ like type, but white space is printed instead of the characters
1614: bounds ?do
1615: i c@ 9 = if \ check for tab
1616: 9
1617: else
1618: bl
1619: then
1620: emit
1621: loop ;
1622:
1623: DEFER DOERROR
1624:
1625: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
1626: cr error-stack @
1627: IF
1628: ." in file included from "
1629: type ." :" dec. drop 2drop
1630: ELSE
1631: type ." :" dec.
1632: cr dup 2over type cr drop
1633: nip -trailing 1- ( line-start index2 )
1634: 0 >r BEGIN
1635: 2dup + c@ bl > WHILE
1636: r> 1+ >r 1- dup 0< UNTIL THEN 1+
1637: ( line-start index1 )
1638: typewhite
1639: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
1640: [char] ^ emit
1641: loop
1642: THEN
1643: ;
1644:
1645: : (DoError) ( throw-code -- )
1646: sourceline# IF
1647: source >in @ sourceline# 0 0 .error-frame
1648: THEN
1649: error-stack @ 0 ?DO
1650: -1 error-stack +!
1651: error-stack dup @ 6 * cells + cell+
1652: 6 cells bounds DO
1653: I @
1654: cell +LOOP
1655: .error-frame
1656: LOOP
1657: dup -2 =
1658: IF
1659: "error @ ?dup
1660: IF
1661: cr count type
1662: THEN
1663: drop
1664: ELSE
1665: .error
1666: THEN
1667: normal-dp dpp ! ;
1668:
1669: ' (DoError) IS DoError
1670:
1671: : quit ( ?? -- ?? ) \ core
1672: r0 @ rp! handler off >tib @ >r
1673: BEGIN
1674: postpone [
1675: ['] 'quit CATCH dup
1676: WHILE
1677: DoError r@ >tib ! r@ tibstack !
1678: REPEAT
1679: drop r> >tib ! ;
1680:
1681: \ Cold 13feb93py
1682:
1683: \ : .name ( name -- ) name>string type space ;
1684: \ : words listwords @
1685: \ BEGIN @ dup WHILE dup .name REPEAT drop ;
1686:
1687: : cstring>sstring ( cstring -- addr n ) \ gforth cstring-to-sstring
1688: -1 0 scan 0 swap 1+ /string ;
1689: : arg ( n -- addr count ) \ gforth
1690: cells argv @ + @ cstring>sstring ;
1691: : #! postpone \ ; immediate
1692:
1693: Create pathstring 2 cells allot \ string
1694: Create pathdirs 2 cells allot \ dir string array, pointer and count
1695: Variable argv
1696: Variable argc
1697:
1698: 0 Value script? ( -- flag )
1699:
1700: : process-path ( addr1 u1 -- addr2 u2 )
1701: \ addr1 u1 is a path string, addr2 u2 is an array of dir strings
1702: align here >r
1703: BEGIN
1704: over >r [char] : scan
1705: over r> tuck - ( rest-str this-str )
1706: dup
1707: IF
1708: 2dup 1- chars + c@ [char] / <>
1709: IF
1710: 2dup chars + [char] / swap c!
1711: 1+
1712: THEN
1713: 2,
1714: ELSE
1715: 2drop
1716: THEN
1717: dup
1718: WHILE
1719: 1 /string
1720: REPEAT
1721: 2drop
1722: here r> tuck - 2 cells / ;
1723:
1724: : do-option ( addr1 len1 addr2 len2 -- n )
1725: 2swap
1726: 2dup s" -e" compare 0= >r
1727: 2dup s" --evaluate" compare 0= r> or
1728: IF 2drop dup >r ['] evaluate catch
1729: ?dup IF dup >r DoError r> negate (bye) THEN
1730: r> >tib +! 2 EXIT THEN
1731: ." Unknown option: " type cr 2drop 1 ;
1732:
1733: : process-args ( -- )
1734: >tib @ >r
1735: argc @ 1
1736: ?DO
1737: I arg over c@ [char] - <>
1738: IF
1739: required 1
1740: ELSE
1741: I 1+ argc @ = IF s" " ELSE I 1+ arg THEN
1742: do-option
1743: THEN
1744: +LOOP
1745: r> >tib ! ;
1746:
1747: Defer 'cold ' noop IS 'cold
1748:
1749: : cold ( -- ) \ gforth
1750: stdout TO outfile-id
1751: pathstring 2@ process-path pathdirs 2!
1752: init-included-files
1753: 'cold
1754: argc @ 1 >
1755: IF
1756: true to script?
1757: ['] process-args catch ?dup
1758: IF
1759: dup >r DoError cr r> negate (bye)
1760: THEN
1761: cr
1762: THEN
1763: false to script?
1764: ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
1765: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
1766: ." Type `bye' to exit"
1767: loadline off quit ;
1768:
1769: : license ( -- ) \ gforth
1770: cr
1771: ." This program is free software; you can redistribute it and/or modify" cr
1772: ." it under the terms of the GNU General Public License as published by" cr
1773: ." the Free Software Foundation; either version 2 of the License, or" cr
1774: ." (at your option) any later version." cr cr
1775:
1776: ." This program is distributed in the hope that it will be useful," cr
1777: ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
1778: ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the" cr
1779: ." GNU General Public License for more details." cr cr
1780:
1781: ." You should have received a copy of the GNU General Public License" cr
1782: ." along with this program; if not, write to the Free Software" cr
1783: ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
1784:
1785: : boot ( path **argv argc -- )
1786: argc ! argv ! cstring>sstring pathstring 2! main-task up!
1787: sp@ dup s0 ! $10 + dup >tib ! tibstack ! #tib off >in off
1788: rp@ r0 ! fp@ f0 ! ['] cold catch DoError bye ;
1789:
1790: : bye ( -- ) \ tools-ext
1791: script? 0= IF cr THEN 0 (bye) ;
1792:
1793: \ **argv may be scanned by the C starter to get some important
1794: \ information, as -display and -geometry for an X client FORTH
1795: \ or space and stackspace overrides
1796:
1797: \ 0 arg contains, however, the name of the program.
1798:
1799:
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