Annotation of gforth/kernel/int.fs, revision 1.52
1.1 pazsan 1: \ definitions needed for interpreter only
2:
1.52 ! pazsan 3: \ Copyright (C) 1995-2000 Free Software Foundation, Inc.
1.11 anton 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:
1.1 pazsan 21: \ \ Revision-Log
22:
23: \ put in seperate file 14sep97jaw
24:
25: \ \ input stream primitives 23feb93py
26:
1.33 jwilke 27: require ./basics.fs \ bounds decimal hex ...
28: require ./io.fs \ type ...
29: require ./nio.fs \ . <# ...
30: require ./errore.fs \ .error ...
1.50 anton 31: require kernel/version.fs \ version-string
1.33 jwilke 32: require ./../chains.fs
33:
1.43 crook 34: : tib ( -- c-addr ) \ core-ext t-i-b
1.40 crook 35: \G @i{c-addr} is the address of the Terminal Input Buffer.
1.29 crook 36: \G OBSOLESCENT: @code{source} superceeds the function of this word.
1.1 pazsan 37: >tib @ ;
38:
1.29 crook 39: Defer source ( -- c-addr u ) \ core
1.1 pazsan 40: \ used by dodefer:, must be defer
1.40 crook 41: \G @i{c-addr} is the address of the input buffer and @i{u} is the
1.29 crook 42: \G number of characters in it.
1.1 pazsan 43:
1.29 crook 44: : (source) ( -- c-addr u )
1.1 pazsan 45: tib #tib @ ;
46: ' (source) IS source
47:
48: : (word) ( addr1 n1 char -- addr2 n2 )
49: dup >r skip 2dup r> scan nip - ;
50:
51: \ (word) should fold white spaces
52: \ this is what (parse-white) does
53:
54: \ word parse 23feb93py
55:
1.29 crook 56: : sword ( char -- addr len ) \ gforth s-word
1.40 crook 57: \G Parses like @code{word}, but the output is like @code{parse} output.
1.47 anton 58: \G @xref{core-idef}.
1.3 anton 59: \ this word was called PARSE-WORD until 0.3.0, but Open Firmware and
60: \ dpANS6 A.6.2.2008 have a word with that name that behaves
61: \ differently (like NAME).
1.1 pazsan 62: source 2dup >r >r >in @ over min /string
63: rot dup bl = IF drop (parse-white) ELSE (word) THEN
64: 2dup + r> - 1+ r> min >in ! ;
65:
1.29 crook 66: : word ( char "<chars>ccc<char>-- c-addr ) \ core
1.40 crook 67: \G Skip leading delimiters. Parse @i{ccc}, delimited by
68: \G @i{char}, in the parse area. @i{c-addr} is the address of a
1.29 crook 69: \G transient region containing the parsed string in
1.40 crook 70: \G counted-string format. If the parse area was empty or
1.29 crook 71: \G contained no characters other than delimiters, the resulting
72: \G string has zero length. A program may replace characters within
73: \G the counted string. OBSOLESCENT: the counted string has a
74: \G trailing space that is not included in its length.
75: sword here place bl here count + c! here ;
76:
77: : parse ( char "ccc<char>" -- c-addr u ) \ core-ext
1.40 crook 78: \G Parse @i{ccc}, delimited by @i{char}, in the parse
79: \G area. @i{c-addr u} specifies the parsed string within the
80: \G parse area. If the parse area was empty, @i{u} is 0.
1.29 crook 81: >r source >in @ over min /string over swap r> scan >r
1.1 pazsan 82: over - dup r> IF 1+ THEN >in +! ;
83:
84: \ name 13feb93py
85:
86: [IFUNDEF] (name) \ name might be a primitive
87:
1.40 crook 88: : (name) ( -- c-addr count ) \ gforth
1.1 pazsan 89: source 2dup >r >r >in @ /string (parse-white)
90: 2dup + r> - 1+ r> min >in ! ;
91: \ name count ;
92: [THEN]
93:
94: : name-too-short? ( c-addr u -- c-addr u )
95: dup 0= -&16 and throw ;
96:
97: : name-too-long? ( c-addr u -- c-addr u )
98: dup $1F u> -&19 and throw ;
99:
100: \ \ Number parsing 23feb93py
101:
102: \ number? number 23feb93py
103:
104: hex
105: const Create bases 10 , 2 , A , 100 ,
106: \ 16 2 10 character
107:
1.18 anton 108: \ !! protect BASE saving wrapper against exceptions
1.1 pazsan 109: : getbase ( addr u -- addr' u' )
110: over c@ [char] $ - dup 4 u<
111: IF
112: cells bases + @ base ! 1 /string
113: ELSE
114: drop
115: THEN ;
116:
1.20 pazsan 117: : sign? ( addr u -- addr u flag )
1.33 jwilke 118: over c@ [char] - = dup >r
1.1 pazsan 119: IF
120: 1 /string
121: THEN
1.20 pazsan 122: r> ;
123:
124: : s>unumber? ( addr u -- ud flag )
1.21 pazsan 125: base @ >r dpl on getbase
1.20 pazsan 126: 0. 2swap
1.18 anton 127: BEGIN ( d addr len )
1.1 pazsan 128: dup >r >number dup
1.18 anton 129: WHILE \ there are characters left
1.1 pazsan 130: dup r> -
1.18 anton 131: WHILE \ the last >number parsed something
132: dup 1- dpl ! over c@ [char] . =
133: WHILE \ the current char is '.'
1.1 pazsan 134: 1 /string
1.18 anton 135: REPEAT THEN \ there are unparseable characters left
1.21 pazsan 136: 2drop false
1.20 pazsan 137: ELSE
138: rdrop 2drop true
1.21 pazsan 139: THEN
140: r> base ! ;
1.20 pazsan 141:
142: \ ouch, this is complicated; there must be a simpler way - anton
143: : s>number? ( addr len -- d f )
144: \ converts string addr len into d, flag indicates success
1.21 pazsan 145: sign? >r
1.20 pazsan 146: s>unumber?
147: 0= IF
1.21 pazsan 148: rdrop false
1.18 anton 149: ELSE \ no characters left, all ok
1.20 pazsan 150: r>
1.1 pazsan 151: IF
152: dnegate
153: THEN
1.18 anton 154: true
1.21 pazsan 155: THEN ;
1.1 pazsan 156:
1.18 anton 157: : s>number ( addr len -- d )
158: \ don't use this, there is no way to tell success
159: s>number? drop ;
160:
1.1 pazsan 161: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
1.18 anton 162: s>number? 0=
1.1 pazsan 163: IF
164: 2drop false EXIT
165: THEN
1.18 anton 166: dpl @ dup 0< IF
1.1 pazsan 167: nip
1.18 anton 168: ELSE
169: 1+
1.1 pazsan 170: THEN ;
171:
172: : number? ( string -- string 0 / n -1 / d 0> )
173: dup >r count snumber? dup if
174: rdrop
175: else
176: r> swap
177: then ;
178:
179: : number ( string -- d )
180: number? ?dup 0= abort" ?" 0<
181: IF
182: s>d
183: THEN ;
184:
185: \ \ Comments ( \ \G
186:
1.29 crook 187: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ thisone- core,file paren
1.17 crook 188: \G ** this will not get annotated. The alias in glocals.fs will instead **
1.29 crook 189: \G It does not work to use "wordset-" prefix since this file is glossed
190: \G by cross.fs which doesn't have the same functionalty as makedoc.fs
1.1 pazsan 191: [char] ) parse 2drop ; immediate
192:
1.51 anton 193: : \ ( compilation 'ccc<newline>' -- ; run-time -- ) \ thisone- core-ext,block-ext backslash
1.29 crook 194: \G ** this will not get annotated. The alias in glocals.fs will instead **
195: \G It does not work to use "wordset-" prefix since this file is glossed
196: \G by cross.fs which doesn't have the same functionalty as makedoc.fs
1.12 pazsan 197: [ has? file [IF] ]
1.1 pazsan 198: blk @
199: IF
200: >in @ c/l / 1+ c/l * >in !
201: EXIT
202: THEN
1.12 pazsan 203: [ [THEN] ]
1.1 pazsan 204: source >in ! drop ; immediate
205:
1.51 anton 206: : \G ( compilation 'ccc<newline>' -- ; run-time -- ) \ gforth backslash-gee
1.19 crook 207: \G Equivalent to @code{\} but used as a tag to annotate definition
208: \G comments into documentation.
1.1 pazsan 209: POSTPONE \ ; immediate
210:
211: \ \ object oriented search list 17mar93py
212:
213: \ word list structure:
214:
215: struct
216: cell% field find-method \ xt: ( c_addr u wid -- nt )
217: cell% field reveal-method \ xt: ( nt wid -- ) \ used by dofield:, must be field
218: cell% field rehash-method \ xt: ( wid -- ) \ re-initializes a "search-data" (hashtables)
219: cell% field hash-method \ xt: ( wid -- ) \ initializes ""
220: \ \ !! what else
221: end-struct wordlist-map-struct
222:
223: struct
1.6 pazsan 224: cell% field wordlist-map \ pointer to a wordlist-map-struct
1.13 anton 225: cell% field wordlist-id \ linked list of words (for WORDS etc.)
1.1 pazsan 226: cell% field wordlist-link \ link field to other wordlists
1.13 anton 227: cell% field wordlist-extend \ wordlist extensions (eg bucket offset)
1.1 pazsan 228: end-struct wordlist-struct
229:
230: : f83find ( addr len wordlist -- nt / false )
1.6 pazsan 231: wordlist-id @ (f83find) ;
1.1 pazsan 232:
233: : initvoc ( wid -- )
234: dup wordlist-map @ hash-method perform ;
235:
236: \ Search list table: find reveal
237: Create f83search ( -- wordlist-map )
238: ' f83find A, ' drop A, ' drop A, ' drop A,
239:
1.6 pazsan 240: here G f83search T A, NIL A, NIL A, NIL A,
1.1 pazsan 241: AValue forth-wordlist \ variable, will be redefined by search.fs
242:
243: AVariable lookup forth-wordlist lookup !
244: \ !! last is user and lookup?! jaw
245: AVariable current ( -- addr ) \ gforth
1.43 crook 246: \G @code{Variable} -- holds the @i{wid} of the compilation word list.
1.1 pazsan 247: AVariable voclink forth-wordlist wordlist-link voclink !
1.38 anton 248: \ lookup AValue context ( -- addr ) \ gforth
249: Defer context ( -- addr ) \ gforth
1.43 crook 250: \G @code{context} @code{@@} is the @i{wid} of the word list at the
251: \G top of the search order.
1.1 pazsan 252:
1.38 anton 253: ' lookup is context
1.1 pazsan 254: forth-wordlist current !
255:
256: \ \ header, finding, ticks 17dec92py
257:
1.33 jwilke 258: hex
259: 80 constant alias-mask \ set when the word is not an alias!
260: 40 constant immediate-mask
261: 20 constant restrict-mask
1.1 pazsan 262:
263: \ higher level parts of find
264:
265: : flag-sign ( f -- 1|-1 )
266: \ true becomes 1, false -1
267: 0= 2* 1+ ;
268:
269: : compile-only-error ( ... -- )
270: -&14 throw ;
271:
272: : (cfa>int) ( cfa -- xt )
273: [ has? compiler [IF] ]
274: dup interpret/compile?
275: if
276: interpret/compile-int @
277: then
278: [ [THEN] ] ;
279:
280: : (x>int) ( cfa b -- xt )
281: \ get interpretation semantics of name
282: restrict-mask and
283: if
284: drop ['] compile-only-error
285: else
286: (cfa>int)
287: then ;
288:
289: : name>string ( nt -- addr count ) \ gforth head-to-string
1.40 crook 290: \g @i{addr count} is the name of the word represented by @i{nt}.
1.1 pazsan 291: cell+ count $1F and ;
292:
293: : ((name>)) ( nfa -- cfa )
294: name>string + cfaligned ;
295:
296: : (name>x) ( nfa -- cfa b )
297: \ cfa is an intermediate cfa and b is the flags byte of nfa
298: dup ((name>))
299: swap cell+ c@ dup alias-mask and 0=
300: IF
301: swap @ swap
302: THEN ;
303:
304: : name>int ( nt -- xt ) \ gforth
1.31 crook 305: \G @i{xt} represents the interpretation semantics of the word
306: \G @i{nt}. If @i{nt} has no interpretation semantics (i.e. is
307: \G @code{compile-only}), @i{xt} is the execution token for
308: \G @code{compile-only-error}, which performs @code{-14 throw}.
1.1 pazsan 309: (name>x) (x>int) ;
310:
311: : name?int ( nt -- xt ) \ gforth
1.31 crook 312: \G Like @code{name>int}, but perform @code{-14 throw} if @i{nt}
313: \G has no interpretation semantics.
1.1 pazsan 314: (name>x) restrict-mask and
315: if
316: compile-only-error \ does not return
317: then
318: (cfa>int) ;
319:
320: : (name>comp) ( nt -- w +-1 ) \ gforth
1.31 crook 321: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 322: (name>x) >r
323: [ has? compiler [IF] ]
324: dup interpret/compile?
325: if
326: interpret/compile-comp @
327: then
328: [ [THEN] ]
329: r> immediate-mask and flag-sign
330: ;
331:
332: : (name>intn) ( nfa -- xt +-1 )
333: (name>x) tuck (x>int) ( b xt )
334: swap immediate-mask and flag-sign ;
335:
1.30 jwilke 336: const Create ??? 0 , 3 c, char ? c, char ? c, char ? c,
337: \ ??? is used by dovar:, must be created/:dovar
338:
339: [IFDEF] forthstart
340: \ if we have a forthstart we can define head? with it
341: \ otherwise leave out the head? check
342:
1.14 anton 343: : head? ( addr -- f )
344: \G heuristic check whether addr is a name token; may deliver false
345: \G positives; addr must be a valid address
346: \ we follow the link fields and check for plausibility; two
347: \ iterations should catch most false addresses: on the first
348: \ iteration, we may get an xt, on the second a code address (or
349: \ some code), which is typically not in the dictionary.
350: 2 0 do
1.41 anton 351: dup dup aligned <> if \ protect @ against unaligned accesses
352: drop false unloop exit
353: then
1.14 anton 354: dup @ dup
355: if ( addr addr1 )
356: dup rot forthstart within
357: if \ addr1 is outside forthstart..addr, not a head
358: drop false unloop exit
359: then ( addr1 )
360: else \ 0 in the link field, no further checks
361: 2drop true unloop exit
362: then
363: loop
364: \ in dubio pro:
365: drop true ;
366:
1.48 anton 367: : >head-noprim ( cfa -- nt ) \ gforth to-head-noprim
1.45 pazsan 368: $25 cell do ( cfa )
1.14 anton 369: dup i - count $9F and + cfaligned over alias-mask + =
370: if ( cfa )
371: dup i - cell - dup head?
372: if
373: nip unloop exit
374: then
375: drop
376: then
377: cell +loop
378: drop ??? ( wouldn't 0 be better? ) ;
1.1 pazsan 379:
1.30 jwilke 380: [ELSE]
381:
1.48 anton 382: : >head-noprim ( cfa -- nt ) \ gforth to-head-noprim
1.45 pazsan 383: $25 cell do ( cfa )
1.30 jwilke 384: dup i - count $9F and + cfaligned over alias-mask + =
385: if ( cfa ) i - cell - unloop exit
386: then
387: cell +loop
388: drop ??? ( wouldn't 0 be better? ) ;
389:
390: [THEN]
1.1 pazsan 391:
392: : body> 0 >body - ;
393:
1.31 crook 394: : (search-wordlist) ( addr count wid -- nt | false )
1.1 pazsan 395: dup wordlist-map @ find-method perform ;
396:
1.31 crook 397: : search-wordlist ( c-addr count wid -- 0 | xt +-1 ) \ search
398: \G Search the word list identified by @i{wid}
399: \G for the definition named by the string at @i{c-addr count}.
1.17 crook 400: \G If the definition is not found, return 0. If the definition
401: \G is found return 1 (if the definition is immediate) or -1
1.31 crook 402: \G (if the definition is not immediate) together with the @i{xt}.
403: \G The @i{xt} returned represents the interpretation semantics.
1.1 pazsan 404: (search-wordlist) dup if
405: (name>intn)
406: then ;
407:
1.31 crook 408: : find-name ( c-addr u -- nt | 0 ) \ gforth
409: \g Find the name @i{c-addr u} in the current search
410: \g order. Return its @i{nt}, if found, otherwise 0.
1.1 pazsan 411: lookup @ (search-wordlist) ;
412:
413: : sfind ( c-addr u -- 0 / xt +-1 ) \ gforth-obsolete
414: find-name dup
415: if ( nt )
416: state @
417: if
418: (name>comp)
419: else
420: (name>intn)
421: then
422: then ;
423:
1.31 crook 424: : find ( c-addr -- xt +-1 | c-addr 0 ) \ core,search
1.17 crook 425: \G Search all word lists in the current search order
1.31 crook 426: \G for the definition named by the counted string at @i{c-addr}.
1.17 crook 427: \G If the definition is not found, return 0. If the definition
428: \G is found return 1 (if the definition is immediate) or -1
1.31 crook 429: \G (if the definition is not immediate) together with the @i{xt}.
1.1 pazsan 430: dup count sfind dup
431: if
432: rot drop
433: then ;
434:
1.34 jwilke 435: \ ticks in interpreter
1.1 pazsan 436:
437: : (') ( "name" -- nt ) \ gforth
1.32 anton 438: name name-too-short?
1.28 anton 439: find-name dup 0=
1.1 pazsan 440: IF
1.42 anton 441: drop -&13 throw
1.1 pazsan 442: THEN ;
443:
444: : ' ( "name" -- xt ) \ core tick
1.31 crook 445: \g @i{xt} represents @i{name}'s interpretation
446: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 447: \g interpretation semantics.
448: (') name?int ;
1.34 jwilke 449:
450: has? compiler 0= [IF] \ interpreter only version of IS and TO
451:
452: : IS ' >body ! ;
453: ' IS Alias TO
454:
455: [THEN]
1.1 pazsan 456:
457: \ \ the interpreter loop mar92py
458:
459: \ interpret 10mar92py
460:
1.37 anton 461: Defer parser ( c-addr u -- )
1.1 pazsan 462: Defer name ( -- c-addr count ) \ gforth
463: \ get the next word from the input buffer
464: ' (name) IS name
465: Defer compiler-notfound ( c-addr count -- )
466: Defer interpreter-notfound ( c-addr count -- )
467:
468: : no.extensions ( addr u -- )
1.42 anton 469: 2drop -&13 throw ;
1.1 pazsan 470: ' no.extensions IS compiler-notfound
471: ' no.extensions IS interpreter-notfound
472:
473: : interpret ( ?? -- ?? ) \ gforth
474: \ interpret/compile the (rest of the) input buffer
1.33 jwilke 475: [ has? backtrace [IF] ]
1.24 anton 476: rp@ backtrace-rp0 !
1.33 jwilke 477: [ [THEN] ]
1.1 pazsan 478: BEGIN
479: ?stack name dup
480: WHILE
481: parser
482: REPEAT
483: 2drop ;
484:
485: \ interpreter 30apr92py
486:
487: \ not the most efficient implementations of interpreter and compiler
1.33 jwilke 488: : interpreter ( c-addr u -- )
1.1 pazsan 489: 2dup find-name dup
490: if
491: nip nip name>int execute
492: else
493: drop
494: 2dup 2>r snumber?
495: IF
496: 2rdrop
497: ELSE
498: 2r> interpreter-notfound
499: THEN
500: then ;
501:
502: ' interpreter IS parser
503:
504: \ \ Query Evaluate 07apr93py
505:
506: has? file 0= [IF]
1.12 pazsan 507: : sourceline# ( -- n ) 1 ;
1.1 pazsan 508: [THEN]
509:
510: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1.29 crook 511: \G Attempt to fill the input buffer from the input source. When
512: \G the input source is the user input device, attempt to receive
513: \G input into the terminal input device. If successful, make the
514: \G result the input buffer, set @code{>IN} to 0 and return true;
515: \G otherwise return false. When the input source is a block, add 1
516: \G to the value of @code{BLK} to make the next block the input
517: \G source and current input buffer, and set @code{>IN} to 0;
518: \G return true if the new value of @code{BLK} is a valid block
519: \G number, false otherwise. When the input source is a text file,
520: \G attempt to read the next line from the file. If successful,
521: \G make the result the current input buffer, set @code{>IN} to 0
522: \G and return true; otherwise, return false. A successful result
523: \G includes receipt of a line containing 0 characters.
1.12 pazsan 524: [ has? file [IF] ]
525: blk @ IF 1 blk +! true 0 >in ! EXIT THEN
526: [ [THEN] ]
527: tib /line
528: [ has? file [IF] ]
529: loadfile @ ?dup
530: IF read-line throw
531: ELSE
532: [ [THEN] ]
533: sourceline# 0< IF 2drop false EXIT THEN
534: accept true
535: [ has? file [IF] ]
536: THEN
537: 1 loadline +!
538: [ [THEN] ]
539: swap #tib ! 0 >in ! ;
1.1 pazsan 540:
541: : query ( -- ) \ core-ext
1.29 crook 542: \G Make the user input device the input source. Receive input into
543: \G the Terminal Input Buffer. Set @code{>IN} to zero. OBSOLESCENT:
544: \G superceeded by @code{accept}.
1.12 pazsan 545: [ has? file [IF] ]
546: blk off loadfile off
547: [ [THEN] ]
1.1 pazsan 548: tib /line accept #tib ! 0 >in ! ;
549:
550: \ save-mem extend-mem
551:
552: has? os [IF]
553: : save-mem ( addr1 u -- addr2 u ) \ gforth
554: \g copy a memory block into a newly allocated region in the heap
555: swap >r
556: dup allocate throw
557: swap 2dup r> -rot move ;
558:
559: : extend-mem ( addr1 u1 u -- addr addr2 u2 )
560: \ extend memory block allocated from the heap by u aus
561: \ the (possibly reallocated piece is addr2 u2, the extension is at addr
562: over >r + dup >r resize throw
563: r> over r> + -rot ;
564: [THEN]
565:
566: \ EVALUATE 17may93jaw
567:
568: has? file 0= [IF]
569: : push-file ( -- ) r>
1.12 pazsan 570: tibstack @ >r >tib @ >r #tib @ >r
1.1 pazsan 571: >tib @ tibstack @ = IF r@ tibstack +! THEN
572: tibstack @ >tib ! >in @ >r >r ;
573:
574: : pop-file ( throw-code -- throw-code )
575: r>
1.12 pazsan 576: r> >in ! r> #tib ! r> >tib ! r> tibstack ! >r ;
1.1 pazsan 577: [THEN]
578:
1.29 crook 579: : evaluate ( c-addr u -- ) \ core,block
1.40 crook 580: \G Save the current input source specification. Store @code{-1} in
581: \G @code{source-id} and @code{0} in @code{blk}. Set @code{>IN} to
582: \G @code{0} and make the string @i{c-addr u} the input source
583: \G and input buffer. Interpret. When the parse area is empty,
584: \G restore the input source specification.
585: push-file #tib ! >tib !
1.29 crook 586: >in off
587: [ has? file [IF] ]
588: blk off loadfile off -1 loadline !
589: [ [THEN] ]
590: ['] interpret catch
591: pop-file throw ;
1.1 pazsan 592:
593: \ \ Quit 13feb93py
594:
595: Defer 'quit
596:
597: Defer .status
598:
599: : prompt state @ IF ." compiled" EXIT THEN ." ok" ;
600:
601: : (Query) ( -- )
1.12 pazsan 602: [ has? file [IF] ]
603: loadfile off blk off loadline off
604: [ [THEN] ]
605: refill drop ;
1.1 pazsan 606:
1.39 anton 607: : (quit) ( -- )
608: \ exits only through THROW etc.
1.42 anton 609: \ sp0 @ cell - handler @ &12 + ! \ !! kludge: fix the stack pointer
1.39 anton 610: \ stored in the system's CATCH frame, so the stack depth will be 0
611: \ after the next THROW it catches (it may be off due to BOUNCEs or
612: \ because process-args left something on the stack)
613: BEGIN
614: .status cr (query) interpret prompt
615: AGAIN ;
1.1 pazsan 616:
617: ' (quit) IS 'quit
618:
619: \ \ DOERROR (DOERROR) 13jun93jaw
620:
621: 8 Constant max-errors
622: Variable error-stack 0 error-stack !
623: max-errors 6 * cells allot
624: \ format of one cell:
625: \ source ( addr u )
626: \ >in
627: \ line-number
628: \ Loadfilename ( addr u )
629:
630: : dec. ( n -- ) \ gforth
1.40 crook 631: \G Display @i{n} as a signed decimal number, followed by a space.
632: \ !! not used...
1.1 pazsan 633: base @ decimal swap . base ! ;
634:
1.23 jwilke 635: : dec.r ( u -- ) \ gforth
1.40 crook 636: \G Display @i{u} as a unsigned decimal number
1.23 jwilke 637: base @ decimal swap 0 .r base ! ;
638:
1.1 pazsan 639: : hex. ( u -- ) \ gforth
1.40 crook 640: \G Display @i{u} as an unsigned hex number, prefixed with a "$" and
1.17 crook 641: \G followed by a space.
1.40 crook 642: \ !! not used...
1.33 jwilke 643: [char] $ emit base @ swap hex u. base ! ;
1.1 pazsan 644:
645: : typewhite ( addr u -- ) \ gforth
1.40 crook 646: \G Like type, but white space is printed instead of the characters.
1.1 pazsan 647: bounds ?do
648: i c@ #tab = if \ check for tab
649: #tab
650: else
651: bl
652: then
653: emit
654: loop ;
655:
656: DEFER DOERROR
1.33 jwilke 657:
658: has? backtrace [IF]
1.15 anton 659: Defer dobacktrace ( -- )
660: ' noop IS dobacktrace
1.33 jwilke 661: [THEN]
1.1 pazsan 662:
1.23 jwilke 663: : .error-string ( throw-code -- )
664: dup -2 =
665: IF "error @ ?dup IF count type THEN drop
666: ELSE .error
667: THEN ;
668:
669: : .error-frame ( throwcode addr1 u1 n1 n2 addr2 u2 -- throwcode )
670: \ addr2 u2: filename of included file
671: \ n2: line number
672: \ n1: error position in input line
673: \ addr1 u1: input line
674:
1.1 pazsan 675: cr error-stack @
676: IF
677: ." in file included from "
1.23 jwilke 678: type ." :" dec.r drop 2drop
1.1 pazsan 679: ELSE
1.23 jwilke 680: type ." :" dec.r ." : " 3 pick .error-string cr
681: dup 2over type cr drop
1.1 pazsan 682: nip -trailing 1- ( line-start index2 )
683: 0 >r BEGIN
684: 2dup + c@ bl > WHILE
685: r> 1+ >r 1- dup 0< UNTIL THEN 1+
686: ( line-start index1 )
687: typewhite
688: r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
689: [char] ^ emit
690: loop
1.23 jwilke 691: THEN ;
1.1 pazsan 692:
693: : (DoError) ( throw-code -- )
694: [ has? os [IF] ]
1.8 pazsan 695: >stderr
1.1 pazsan 696: [ [THEN] ]
697: sourceline# IF
1.8 pazsan 698: source >in @ sourceline# 0 0 .error-frame
1.1 pazsan 699: THEN
700: error-stack @ 0 ?DO
701: -1 error-stack +!
702: error-stack dup @ 6 * cells + cell+
703: 6 cells bounds DO
704: I @
705: cell +LOOP
706: .error-frame
707: LOOP
1.33 jwilke 708: drop
709: [ has? backtrace [IF] ]
710: dobacktrace
711: [ [THEN] ]
1.8 pazsan 712: normal-dp dpp ! ;
1.1 pazsan 713:
714: ' (DoError) IS DoError
715:
716: : quit ( ?? -- ?? ) \ core
1.27 crook 717: \G Empty the return stack, make the user input device
718: \G the input source, enter interpret state and start
719: \G the text interpreter.
1.5 anton 720: rp0 @ rp! handler off clear-tibstack >tib @ >r
1.1 pazsan 721: BEGIN
722: [ has? compiler [IF] ]
723: postpone [
724: [ [THEN] ]
725: ['] 'quit CATCH dup
726: WHILE
1.22 anton 727: <# \ reset hold area, or we may get another error
1.1 pazsan 728: DoError r@ >tib ! r@ tibstack !
729: REPEAT
730: drop r> >tib ! ;
731:
732: \ \ Cold Boot 13feb93py
733:
734: : (bootmessage)
735: ." GForth " version-string type
1.52 ! pazsan 736: ." , Copyright (C) 1995-2000 Free Software Foundation, Inc." cr
1.1 pazsan 737: ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'"
738: [ has? os [IF] ]
739: cr ." Type `bye' to exit"
740: [ [THEN] ] ;
741:
742: defer bootmessage
743: defer process-args
744:
745: ' (bootmessage) IS bootmessage
746:
1.10 anton 747: Defer 'cold ( -- ) \ gforth tick-cold
1.1 pazsan 748: \ hook (deferred word) for things to do right before interpreting the
749: \ command-line arguments
750: ' noop IS 'cold
751:
752:
753: Variable init8
754:
755: : cold ( -- ) \ gforth
1.44 anton 756: [ has? backtrace [IF] ]
757: rp@ backtrace-rp0 !
758: [ [THEN] ]
1.1 pazsan 759: [ has? file [IF] ]
760: pathstring 2@ fpath only-path
761: init-included-files
762: [ [THEN] ]
763: 'cold
764: init8 chainperform
765: [ has? file [IF] ]
1.8 pazsan 766: process-args
1.12 pazsan 767: loadline off
1.1 pazsan 768: [ [THEN] ]
769: bootmessage
1.12 pazsan 770: quit ;
1.1 pazsan 771:
1.5 anton 772: : clear-tibstack ( -- )
773: [ has? glocals [IF] ]
774: lp@ forthstart 7 cells + @ -
775: [ [ELSE] ]
776: [ has? os [IF] ]
1.8 pazsan 777: r0 @ forthstart 6 cells + @ -
1.5 anton 778: [ [ELSE] ]
1.16 pazsan 779: sp@ $10 cells +
1.5 anton 780: [ [THEN] ]
781: [ [THEN] ]
782: dup >tib ! tibstack ! #tib off >in off ;
783:
1.1 pazsan 784: : boot ( path **argv argc -- )
785: main-task up!
786: [ has? os [IF] ]
787: stdout TO outfile-id
1.7 pazsan 788: stdin TO infile-id
1.1 pazsan 789: \ !! [ [THEN] ]
790: \ !! [ has? file [IF] ]
791: argc ! argv ! pathstring 2!
792: [ [THEN] ]
793: sp@ sp0 !
1.5 anton 794: clear-tibstack
1.1 pazsan 795: rp@ rp0 !
796: [ has? floating [IF] ]
797: fp@ fp0 !
798: [ [THEN] ]
1.46 anton 799: handler off
1.8 pazsan 800: ['] cold catch DoError cr
1.1 pazsan 801: [ has? os [IF] ]
1.35 anton 802: 1 (bye) \ !! determin exit code from throw code?
1.1 pazsan 803: [ [THEN] ]
804: ;
805:
806: has? os [IF]
807: : bye ( -- ) \ tools-ext
808: [ has? file [IF] ]
809: script? 0= IF cr THEN
810: [ [ELSE] ]
811: cr
812: [ [THEN] ]
813: 0 (bye) ;
814: [THEN]
815:
816: \ **argv may be scanned by the C starter to get some important
817: \ information, as -display and -geometry for an X client FORTH
818: \ or space and stackspace overrides
819:
820: \ 0 arg contains, however, the name of the program.
821:
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