Annotation of gforth/kernel/comp.fs, revision 1.45
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.28 anton 3: \ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
1.6 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
1.29 anton 19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.6 anton 20:
1.1 pazsan 21: \ \ Revisions-Log
22:
23: \ put in seperate file 14sep97jaw
24:
25: \ \ here allot , c, A, 17dec92py
26:
1.14 jwilke 27: [IFUNDEF] allot
28: [IFUNDEF] forthstart
29: : allot ( n -- ) \ core
30: dup unused u> -8 and throw
31: dp +! ;
32: [THEN]
33: [THEN]
34:
35: \ we default to this version if we have nothing else 05May99jaw
36: [IFUNDEF] allot
1.1 pazsan 37: : allot ( n -- ) \ core
1.23 anton 38: \G Reserve @i{n} address units of data space without
39: \G initialization. @i{n} is a signed number, passing a negative
40: \G @i{n} releases memory. In ANS Forth you can only deallocate
41: \G memory from the current contiguous region in this way. In
42: \G Gforth you can deallocate anything in this way but named words.
43: \G The system does not check this restriction.
1.12 anton 44: here +
45: dup 1- usable-dictionary-end forthstart within -8 and throw
46: dp ! ;
1.14 jwilke 47: [THEN]
1.1 pazsan 48:
1.22 crook 49: : c, ( c -- ) \ core c-comma
1.15 crook 50: \G Reserve data space for one char and store @i{c} in the space.
1.1 pazsan 51: here 1 chars allot c! ;
52:
1.22 crook 53: : , ( w -- ) \ core comma
1.15 crook 54: \G Reserve data space for one cell and store @i{w} in the space.
1.1 pazsan 55: here cell allot ! ;
56:
57: : 2, ( w1 w2 -- ) \ gforth
1.15 crook 58: \G Reserve data space for two cells and store the double @i{w1
1.24 anton 59: \G w2} there, @i{w2} first (lower address).
1.1 pazsan 60: here 2 cells allot 2! ;
61:
62: \ : aligned ( addr -- addr' ) \ core
63: \ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
64:
65: : align ( -- ) \ core
1.15 crook 66: \G If the data-space pointer is not aligned, reserve enough space to align it.
1.1 pazsan 67: here dup aligned swap ?DO bl c, LOOP ;
68:
1.22 crook 69: \ : faligned ( addr -- f-addr ) \ float f-aligned
1.1 pazsan 70: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
71:
1.22 crook 72: : falign ( -- ) \ float f-align
1.15 crook 73: \G If the data-space pointer is not float-aligned, reserve
74: \G enough space to align it.
1.1 pazsan 75: here dup faligned swap
76: ?DO
77: bl c,
78: LOOP ;
79:
1.9 anton 80: : maxalign ( -- ) \ gforth
1.23 anton 81: \G Align data-space pointer for all alignment requirements.
1.1 pazsan 82: here dup maxaligned swap
83: ?DO
84: bl c,
85: LOOP ;
86:
87: \ the code field is aligned if its body is maxaligned
88: ' maxalign Alias cfalign ( -- ) \ gforth
1.24 anton 89: \G Align data-space pointer for code field requirements (i.e., such
90: \G that the corresponding body is maxaligned).
1.1 pazsan 91:
92: ' , alias A, ( addr -- ) \ gforth
93:
94: ' NOOP ALIAS const
95:
96: \ \ Header 23feb93py
97:
98: \ input-stream, nextname and noname are quite ugly (passing
99: \ information through global variables), but they are useful for dealing
100: \ with existing/independent defining words
101:
102: defer (header)
103: defer header ( -- ) \ gforth
104: ' (header) IS header
105:
106: : string, ( c-addr u -- ) \ gforth
107: \G puts down string as cstring
108: dup c, here swap chars dup allot move ;
109:
1.30 anton 110: : longstring, ( c-addr u -- ) \ gforth
111: \G puts down string as cstring
112: dup , here swap chars dup allot move ;
113:
1.1 pazsan 114: : header, ( c-addr u -- ) \ gforth
115: name-too-long?
116: align here last !
117: current @ 1 or A, \ link field; before revealing, it contains the
118: \ tagged reveal-into wordlist
1.30 anton 119: longstring, cfalign
1.1 pazsan 120: alias-mask lastflags cset ;
121:
122: : input-stream-header ( "name" -- )
123: name name-too-short? header, ;
124:
125: : input-stream ( -- ) \ general
126: \G switches back to getting the name from the input stream ;
127: ['] input-stream-header IS (header) ;
128:
129: ' input-stream-header IS (header)
130:
1.32 anton 131: 2variable nextname-string
1.1 pazsan 132:
1.33 pazsan 133: has? OS [IF]
1.1 pazsan 134: : nextname-header ( -- )
1.32 anton 135: nextname-string 2@ header,
136: nextname-string free-mem-var
1.1 pazsan 137: input-stream ;
1.33 pazsan 138: [THEN]
1.1 pazsan 139:
140: \ the next name is given in the string
141:
1.33 pazsan 142: has? OS [IF]
1.1 pazsan 143: : nextname ( c-addr u -- ) \ gforth
1.19 anton 144: \g The next defined word will have the name @var{c-addr u}; the
145: \g defining word will leave the input stream alone.
1.1 pazsan 146: name-too-long?
1.32 anton 147: nextname-string free-mem-var
148: save-mem nextname-string 2!
1.1 pazsan 149: ['] nextname-header IS (header) ;
1.33 pazsan 150: [THEN]
1.1 pazsan 151:
152: : noname-header ( -- )
153: 0 last ! cfalign
154: input-stream ;
155:
156: : noname ( -- ) \ gforth
1.19 anton 157: \g The next defined word will be anonymous. The defining word will
158: \g leave the input stream alone. The xt of the defined word will
159: \g be given by @code{lastxt}.
1.1 pazsan 160: ['] noname-header IS (header) ;
161:
162: : lastxt ( -- xt ) \ gforth
1.15 crook 163: \G @i{xt} is the execution token of the last word defined.
1.13 crook 164: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 165: lastcfa @ ;
166:
167: \ \ literals 17dec92py
168:
169: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 170: \G Compilation semantics: compile the run-time semantics.@*
171: \G Run-time Semantics: push @i{n}.@*
172: \G Interpretation semantics: undefined.
1.14 jwilke 173: [ [IFDEF] lit, ]
174: lit,
175: [ [ELSE] ]
1.27 anton 176: postpone lit ,
1.14 jwilke 177: [ [THEN] ] ; immediate restrict
1.1 pazsan 178:
179: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 180: [ [IFDEF] alit, ]
181: alit,
182: [ [ELSE] ]
183: postpone lit A,
184: [ [THEN] ] ; immediate restrict
1.1 pazsan 185:
1.8 crook 186: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 187: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
188: \G display code representing the first character of @i{ccc}.
1.1 pazsan 189: bl word char+ c@ ;
190:
1.8 crook 191: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 192: \G Compilation: skip leading spaces. Parse the string
1.15 crook 193: \G @i{ccc}. Run-time: return @i{c}, the display code
194: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 195: \G semantics for this word are undefined.
1.1 pazsan 196: char postpone Literal ; immediate restrict
197:
198: \ \ threading 17mar93py
199:
200: : cfa, ( code-address -- ) \ gforth cfa-comma
201: here
202: dup lastcfa !
203: 0 A, 0 , code-address! ;
204:
1.14 jwilke 205: [IFUNDEF] compile,
1.34 anton 206: defer compile, ( xt -- ) \ core-ext compile-comma
207: \G Compile the word represented by the execution token @i{xt}
208: \G into the current definition.
209:
210: ' , is compile,
1.14 jwilke 211: [THEN]
1.1 pazsan 212:
1.40 anton 213: defer basic-block-end ( -- )
214:
215: : bb-end ( -- )
216: 0 last-compiled ! ;
217: ' bb-end is basic-block-end
218:
1.36 pazsan 219: has? peephole [IF]
1.40 anton 220:
221: \ dynamic only
222: \ : peephole-compile, ( xt -- )
223: \ \ compile xt, appending its code to the current dynamic superinstruction
224: \ compile-prim , ;
1.38 anton 225:
1.40 anton 226: \ static only
1.38 anton 227: \ : peephole-compile, ( xt -- )
228: \ \ compile xt, possibly combining it with the previous compiled xt
229: \ \ into a superinstruction (static superinstructions)
230: \ last-compiled @ ?dup if
231: \ @ over peeptable peephole-opt ?dup if
232: \ last-compiled @ ! drop EXIT
233: \ then
234: \ then
235: \ here last-compiled !
236: \ dyn-compile, ;
1.34 anton 237:
1.40 anton 238: : dyn-compile! ( xt -- )
239: \ compile xt, appending its code to the current dynamic superinstruction
240: compile-prim last-compiled-here @ ! ;
241:
242: :noname ( -- )
243: last-compiled @ if
244: last-compiled @ dyn-compile!
245: 0 last-compiled !
246: then ;
247: is basic-block-end
248:
249: : static-compile, ( xt -- )
250: \ compile xt, possibly combining it with the previous compiled xt
251: \ into a superinstruction (static superinstructions)
252: last-compiled @ ?dup if
253: over peeptable peephole-opt ?dup if ( xt comb-xt )
254: last-compiled ! drop EXIT
255: then ( xt )
256: last-compiled @ dyn-compile!
257: then ( xt )
258: last-compiled !
259: here last-compiled-here ! 0 , ;
1.42 anton 260:
1.35 anton 261: : compile-to-prims, ( xt -- )
262: \G compile xt to use primitives (and their peephole optimization)
263: \G instead of ","-ing the xt.
264: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 265: dup >does-code if
266: POSTPONE does-exec , EXIT
1.41 anton 267: \ dup >body POSTPONE literal POSTPONE call >does-code , EXIT
1.35 anton 268: then
269: dup >code-address CASE
1.42 anton 270: \ docon: OF >body POSTPONE lit@ , EXIT ENDOF
1.41 anton 271: docon: OF >body POSTPONE literal POSTPONE @ EXIT ENDOF
1.42 anton 272: \ docon is also used by VALUEs, so don't @ at compile time
1.35 anton 273: docol: OF >body POSTPONE call , EXIT ENDOF
274: dovar: OF >body POSTPONE literal EXIT ENDOF
275: douser: OF >body @ POSTPONE useraddr , EXIT ENDOF
1.42 anton 276: dodefer: OF >body POSTPONE lit-perform , EXIT ENDOF
277: \ dofield: OF >body @ POSTPONE lit+ , EXIT ENDOF
1.41 anton 278: dofield: OF >body @ POSTPONE literal POSTPONE + EXIT ENDOF
1.35 anton 279: ENDCASE
1.40 anton 280: static-compile, ;
1.35 anton 281:
282: ' compile-to-prims, IS compile,
1.36 pazsan 283: [ELSE]
284: ' , is compile,
285: [THEN]
1.34 anton 286:
1.1 pazsan 287: : !does ( addr -- ) \ gforth store-does
288: lastxt does-code! ;
289:
290: : (does>) ( R: addr -- )
291: r> cfaligned /does-handler + !does ;
292:
293: : dodoes, ( -- )
294: cfalign here /does-handler allot does-handler! ;
295:
296: : (compile) ( -- ) \ gforth
297: r> dup cell+ >r @ compile, ;
298:
299: \ \ ticks
300:
301: : name>comp ( nt -- w xt ) \ gforth
1.15 crook 302: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 303: (name>comp)
304: 1 = if
305: ['] execute
306: else
307: ['] compile,
308: then ;
309:
310: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
311: (') postpone ALiteral ; immediate restrict
312:
313: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 314: \g @i{xt} represents @i{name}'s interpretation
315: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 316: \g interpretation semantics.
317: ' postpone ALiteral ; immediate restrict
318:
1.5 anton 319: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 320: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 321: (') name>comp ;
322:
323: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 324: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 325: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
326:
1.18 jwilke 327: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 328: \g Compile the compilation semantics represented by the
329: \g compilation token @i{w xt}.
1.18 jwilke 330: dup ['] execute =
331: if
332: drop compile,
333: else
334: dup ['] compile, =
335: if
336: drop POSTPONE (compile) a,
337: else
338: swap POSTPONE aliteral compile,
339: then
340: then ;
341:
342: : POSTPONE ( "name" -- ) \ core
343: \g Compiles the compilation semantics of @i{name}.
344: COMP' postpone, ; immediate restrict
345:
1.1 pazsan 346: \ \ recurse 17may93jaw
347:
348: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 349: \g Call the current definition.
1.1 pazsan 350: lastxt compile, ; immediate restrict
351:
352: \ \ compiler loop
353:
354: : compiler ( c-addr u -- )
355: 2dup find-name dup
356: if ( c-addr u nt )
357: nip nip name>comp execute
358: else
359: drop
360: 2dup snumber? dup
361: IF
362: 0>
363: IF
364: swap postpone Literal
365: THEN
366: postpone Literal
367: 2drop
368: ELSE
369: drop compiler-notfound
370: THEN
371: then ;
372:
1.22 crook 373: : [ ( -- ) \ core left-bracket
1.8 crook 374: \G Enter interpretation state. Immediate word.
1.1 pazsan 375: ['] interpreter IS parser state off ; immediate
376:
377: : ] ( -- ) \ core right-bracket
1.8 crook 378: \G Enter compilation state.
1.1 pazsan 379: ['] compiler IS parser state on ;
380:
381: \ \ Strings 22feb93py
382:
1.44 anton 383: : S, ( addr u -- )
1.45 ! anton 384: \ allot string as counted string
1.44 anton 385: here over char+ allot place align ;
1.45 ! anton 386:
! 387: : mem, ( addr u -- )
! 388: \ allot the memory block HERE (do alignment yourself)
! 389: here over allot swap move ;
1.1 pazsan 390:
1.44 anton 391: : ," ( "string"<"> -- )
392: [char] " parse s, ;
1.1 pazsan 393:
394: \ \ Header states 23feb93py
395:
396: : cset ( bmask c-addr -- )
1.30 anton 397: tuck @ or swap ! ;
1.1 pazsan 398:
399: : creset ( bmask c-addr -- )
1.30 anton 400: tuck @ swap invert and swap ! ;
1.1 pazsan 401:
402: : ctoggle ( bmask c-addr -- )
1.30 anton 403: tuck @ xor swap ! ;
1.1 pazsan 404:
405: : lastflags ( -- c-addr )
406: \ the address of the flags byte in the last header
407: \ aborts if the last defined word was headerless
408: last @ dup 0= abort" last word was headerless" cell+ ;
409:
410: : immediate ( -- ) \ core
1.10 crook 411: \G Make the compilation semantics of a word be to @code{execute}
412: \G the execution semantics.
1.1 pazsan 413: immediate-mask lastflags cset ;
414:
415: : restrict ( -- ) \ gforth
1.10 crook 416: \G A synonym for @code{compile-only}
1.1 pazsan 417: restrict-mask lastflags cset ;
1.18 jwilke 418:
1.1 pazsan 419: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 420: \G Remove the interpretation semantics of a word.
1.1 pazsan 421:
422: \ \ Create Variable User Constant 17mar93py
423:
1.15 crook 424: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 425: Header reveal
426: alias-mask lastflags creset
427: dup A, lastcfa ! ;
428:
429: doer? :dovar [IF]
430:
431: : Create ( "name" -- ) \ core
432: Header reveal dovar: cfa, ;
433: [ELSE]
434:
435: : Create ( "name" -- ) \ core
436: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
437: [THEN]
438:
439: : Variable ( "name" -- ) \ core
440: Create 0 , ;
441:
442: : AVariable ( "name" -- ) \ gforth
443: Create 0 A, ;
444:
1.22 crook 445: : 2Variable ( "name" -- ) \ double two-variable
1.1 pazsan 446: create 0 , 0 , ;
447:
1.21 crook 448: : uallot ( n -- ) \ gforth
449: udp @ swap udp +! ;
1.1 pazsan 450:
451: doer? :douser [IF]
452:
453: : User ( "name" -- ) \ gforth
454: Header reveal douser: cfa, cell uallot , ;
455:
456: : AUser ( "name" -- ) \ gforth
457: User ;
458: [ELSE]
459:
460: : User Create cell uallot , DOES> @ up @ + ;
461:
462: : AUser User ;
463: [THEN]
464:
465: doer? :docon [IF]
466: : (Constant) Header reveal docon: cfa, ;
467: [ELSE]
468: : (Constant) Create DOES> @ ;
469: [THEN]
470:
471: : Constant ( w "name" -- ) \ core
1.15 crook 472: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 473: \G
1.15 crook 474: \G @i{name} execution: @i{-- w}
1.1 pazsan 475: (Constant) , ;
476:
477: : AConstant ( addr "name" -- ) \ gforth
478: (Constant) A, ;
479:
480: : Value ( w "name" -- ) \ core-ext
481: (Constant) , ;
482:
1.37 jwilke 483: : AValue ( w "name" -- ) \ core-ext
484: (Constant) A, ;
485:
1.22 crook 486: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 487: Create ( w1 w2 "name" -- )
488: 2,
489: DOES> ( -- w1 w2 )
490: 2@ ;
491:
492: doer? :dofield [IF]
493: : (Field) Header reveal dofield: cfa, ;
494: [ELSE]
495: : (Field) Create DOES> @ + ;
496: [THEN]
1.39 pazsan 497:
498: \ \ interpret/compile:
499:
500: struct
501: >body
502: cell% field interpret/compile-int
503: cell% field interpret/compile-comp
504: end-struct interpret/compile-struct
505:
506: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
507: Create immediate swap A, A,
508: DOES>
509: abort" executed primary cfa of an interpret/compile: word" ;
510: \ state @ IF cell+ THEN perform ;
511:
1.1 pazsan 512: \ IS Defer What's Defers TO 24feb93py
513:
514: doer? :dodefer [IF]
515:
516: : Defer ( "name" -- ) \ gforth
517: \ !! shouldn't it be initialized with abort or something similar?
518: Header Reveal dodefer: cfa,
519: ['] noop A, ;
1.18 jwilke 520:
1.1 pazsan 521: [ELSE]
522:
523: : Defer ( "name" -- ) \ gforth
524: Create ['] noop A,
525: DOES> @ execute ;
1.18 jwilke 526:
1.1 pazsan 527: [THEN]
528:
1.25 anton 529: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
530: \G Compiles the present contents of the deferred word @i{name}
531: \G into the current definition. I.e., this produces static
532: \G binding as if @i{name} was not deferred.
1.1 pazsan 533: ' >body @ compile, ; immediate
1.18 jwilke 534:
535: :noname
536: dodoes, here !does ]
537: defstart :-hook ;
538: :noname
539: ;-hook ?struc
540: [ has? xconds [IF] ] exit-like [ [THEN] ]
541: postpone (does>) dodoes,
542: defstart :-hook ;
543: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
544:
1.20 anton 545: : <IS> ( "name" xt -- ) \ gforth
546: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
547: ' >body ! ;
548:
549: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
550: \g At run-time, changes the @code{defer}red word @var{name} to
551: \g execute @var{xt}.
1.18 jwilke 552: ' >body postpone ALiteral postpone ! ; immediate restrict
553:
1.20 anton 554: ' <IS>
1.18 jwilke 555: ' [IS]
556: interpret/compile: IS ( xt "name" -- ) \ gforth
1.21 crook 557: \G A combined word made up from @code{<IS>} and @code{[IS]}.
1.18 jwilke 558:
1.20 anton 559: ' <IS>
560: ' [IS]
561: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 562:
563: :noname ' >body @ ;
564: :noname ' >body postpone ALiteral postpone @ ;
1.25 anton 565: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
566: \G @i{Xt} is the XT that is currently assigned to @i{name}.
1.18 jwilke 567:
568: : interpret/compile? ( xt -- flag )
569: >does-code ['] DOES> >does-code = ;
1.1 pazsan 570:
571: \ \ : ; 24feb93py
572:
573: defer :-hook ( sys1 -- sys2 )
574:
575: defer ;-hook ( sys2 -- sys1 )
576:
1.16 jwilke 577: 0 Constant defstart
578:
1.14 jwilke 579: [IFDEF] docol,
580: : (:noname) ( -- colon-sys )
581: \ common factor of : and :noname
1.34 anton 582: docol, ]comp
1.14 jwilke 583: [ELSE]
1.7 anton 584: : (:noname) ( -- colon-sys )
585: \ common factor of : and :noname
1.34 anton 586: docol: cfa,
1.14 jwilke 587: [THEN]
1.40 anton 588: defstart ] :-hook ;
1.7 anton 589:
1.1 pazsan 590: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 591: Header (:noname) ;
592:
593: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
594: 0 last !
595: cfalign here (:noname) ;
1.1 pazsan 596:
1.14 jwilke 597: [IFDEF] fini,
598: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
599: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
600: [ELSE]
1.1 pazsan 601: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.37 jwilke 602: ;-hook ?struc [compile] exit reveal postpone [ ; immediate restrict
1.14 jwilke 603: [THEN]
1.1 pazsan 604:
605: \ \ Search list handling: reveal words, recursive 23feb93py
606:
607: : last? ( -- false / nfa nfa )
608: last @ ?dup ;
609:
610: : (reveal) ( nt wid -- )
1.3 pazsan 611: wordlist-id dup >r
1.1 pazsan 612: @ over ( name>link ) !
613: r> ! ;
614:
615: \ make entry in wordlist-map
616: ' (reveal) f83search reveal-method !
617:
618: Variable warnings ( -- addr ) \ gforth
619: G -1 warnings T !
620:
621: : check-shadow ( addr count wid -- )
1.2 pazsan 622: \G prints a warning if the string is already present in the wordlist
623: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
624: >stderr
625: ." redefined " name>string 2dup type
1.43 anton 626: str= 0= if
1.2 pazsan 627: ." with " type
628: else
629: 2drop
630: then
631: space space EXIT
632: then
633: 2drop 2drop ;
1.1 pazsan 634:
635: : reveal ( -- ) \ gforth
636: last?
637: if \ the last word has a header
638: dup ( name>link ) @ 1 and
639: if \ it is still hidden
640: dup ( name>link ) @ 1 xor ( nt wid )
641: 2dup >r name>string r> check-shadow ( nt wid )
642: dup wordlist-map @ reveal-method perform
643: else
644: drop
645: then
646: then ;
647:
648: : rehash ( wid -- )
649: dup wordlist-map @ rehash-method perform ;
650:
651: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 652: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 653: \g recursively.
654: immediate restrict
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