Annotation of gforth/kernel/comp.fs, revision 1.82
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.74 anton 3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005 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
1.55 anton 111: \G puts down string as longcstring
1.30 anton 112: dup , here swap chars dup allot move ;
113:
1.1 pazsan 114: : header, ( c-addr u -- ) \ gforth
115: name-too-long?
1.53 anton 116: dup max-name-length @ max max-name-length !
1.1 pazsan 117: align here last !
118: current @ 1 or A, \ link field; before revealing, it contains the
119: \ tagged reveal-into wordlist
1.78 pazsan 120: [ has? f83headerstring [IF] ]
121: string,
122: [ [ELSE] ]
1.79 pazsan 123: longstring,
1.78 pazsan 124: [ [THEN] ]
1.79 pazsan 125: cfalign alias-mask lastflags cset ;
1.1 pazsan 126:
127: : input-stream-header ( "name" -- )
1.80 pazsan 128: parse-name name-too-short? header, ;
1.1 pazsan 129:
130: : input-stream ( -- ) \ general
131: \G switches back to getting the name from the input stream ;
132: ['] input-stream-header IS (header) ;
133:
134: ' input-stream-header IS (header)
135:
1.32 anton 136: 2variable nextname-string
1.1 pazsan 137:
1.33 pazsan 138: has? OS [IF]
1.1 pazsan 139: : nextname-header ( -- )
1.32 anton 140: nextname-string 2@ header,
141: nextname-string free-mem-var
1.1 pazsan 142: input-stream ;
1.33 pazsan 143: [THEN]
1.1 pazsan 144:
145: \ the next name is given in the string
146:
1.33 pazsan 147: has? OS [IF]
1.1 pazsan 148: : nextname ( c-addr u -- ) \ gforth
1.19 anton 149: \g The next defined word will have the name @var{c-addr u}; the
150: \g defining word will leave the input stream alone.
1.1 pazsan 151: name-too-long?
1.32 anton 152: nextname-string free-mem-var
153: save-mem nextname-string 2!
1.1 pazsan 154: ['] nextname-header IS (header) ;
1.33 pazsan 155: [THEN]
1.1 pazsan 156:
157: : noname-header ( -- )
158: 0 last ! cfalign
159: input-stream ;
160:
161: : noname ( -- ) \ gforth
1.19 anton 162: \g The next defined word will be anonymous. The defining word will
163: \g leave the input stream alone. The xt of the defined word will
1.56 anton 164: \g be given by @code{latestxt}.
1.1 pazsan 165: ['] noname-header IS (header) ;
166:
1.56 anton 167: : latestxt ( -- xt ) \ gforth
1.15 crook 168: \G @i{xt} is the execution token of the last word defined.
1.13 crook 169: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 170: lastcfa @ ;
171:
1.56 anton 172: ' latestxt alias lastxt \ gforth-obsolete
173: \G old name for @code{latestxt}.
174:
175: : latest ( -- nt ) \ gforth
176: \G @var{nt} is the name token of the last word defined; it is 0 if the
177: \G last word has no name.
178: last @ ;
179:
1.1 pazsan 180: \ \ literals 17dec92py
181:
182: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 183: \G Compilation semantics: compile the run-time semantics.@*
184: \G Run-time Semantics: push @i{n}.@*
185: \G Interpretation semantics: undefined.
1.14 jwilke 186: [ [IFDEF] lit, ]
187: lit,
188: [ [ELSE] ]
1.27 anton 189: postpone lit ,
1.14 jwilke 190: [ [THEN] ] ; immediate restrict
1.1 pazsan 191:
1.72 anton 192: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
193: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
194: \G placed on the stack. Interpretation semantics are undefined.
195: swap postpone Literal postpone Literal ; immediate restrict
196:
1.1 pazsan 197: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 198: [ [IFDEF] alit, ]
199: alit,
200: [ [ELSE] ]
201: postpone lit A,
202: [ [THEN] ] ; immediate restrict
1.1 pazsan 203:
1.70 pazsan 204: Defer char@ ( addr u -- char addr' u' )
205: :noname over c@ -rot 1 /string ; IS char@
206:
1.8 crook 207: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 208: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
209: \G display code representing the first character of @i{ccc}.
1.70 pazsan 210: bl word count char@ 2drop ;
1.1 pazsan 211:
1.8 crook 212: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 213: \G Compilation: skip leading spaces. Parse the string
1.15 crook 214: \G @i{ccc}. Run-time: return @i{c}, the display code
215: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 216: \G semantics for this word are undefined.
1.1 pazsan 217: char postpone Literal ; immediate restrict
218:
219: \ \ threading 17mar93py
220:
221: : cfa, ( code-address -- ) \ gforth cfa-comma
222: here
223: dup lastcfa !
224: 0 A, 0 , code-address! ;
225:
1.14 jwilke 226: [IFUNDEF] compile,
1.34 anton 227: defer compile, ( xt -- ) \ core-ext compile-comma
228: \G Compile the word represented by the execution token @i{xt}
229: \G into the current definition.
230:
231: ' , is compile,
1.14 jwilke 232: [THEN]
1.1 pazsan 233:
1.80 pazsan 234: has? ec 0= [IF]
1.40 anton 235: defer basic-block-end ( -- )
236:
1.60 anton 237: :noname ( -- )
238: 0 compile-prim1 ;
239: is basic-block-end
1.80 pazsan 240: [THEN]
1.40 anton 241:
1.36 pazsan 242: has? peephole [IF]
1.40 anton 243:
244: \ dynamic only
1.49 anton 245: : peephole-compile, ( xt -- )
246: \ compile xt, appending its code to the current dynamic superinstruction
247: here swap , compile-prim1 ;
1.38 anton 248:
1.35 anton 249: : compile-to-prims, ( xt -- )
250: \G compile xt to use primitives (and their peephole optimization)
251: \G instead of ","-ing the xt.
252: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 253: dup >does-code if
1.66 anton 254: ['] does-exec peephole-compile, , EXIT
255: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 256: then
257: dup >code-address CASE
1.66 anton 258: docon: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
259: \ docon: OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42 anton 260: \ docon is also used by VALUEs, so don't @ at compile time
1.66 anton 261: docol: OF >body ['] call peephole-compile, , EXIT ENDOF
262: dovar: OF >body ['] lit peephole-compile, , EXIT ENDOF
263: douser: OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
264: dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
265: dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
266: \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.48 anton 267: \ code words and ;code-defined words (code words could be optimized):
1.66 anton 268: dup in-dictionary? IF drop POSTPONE literal ['] execute peephole-compile, EXIT THEN
1.35 anton 269: ENDCASE
1.49 anton 270: peephole-compile, ;
1.35 anton 271:
272: ' compile-to-prims, IS compile,
1.36 pazsan 273: [ELSE]
274: ' , is compile,
275: [THEN]
1.34 anton 276:
1.1 pazsan 277: : !does ( addr -- ) \ gforth store-does
1.56 anton 278: latestxt does-code! ;
1.1 pazsan 279:
1.65 anton 280: \ !! unused, but ifdefed/gosted in some places
1.1 pazsan 281: : (does>) ( R: addr -- )
1.62 anton 282: r> cfaligned /does-handler + !does ; \ !! no gforth-native
1.1 pazsan 283:
1.64 anton 284: : (does>2) ( addr -- )
285: cfaligned /does-handler + !does ;
286:
1.1 pazsan 287: : dodoes, ( -- )
288: cfalign here /does-handler allot does-handler! ;
289:
1.61 pazsan 290: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63 anton 291: true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1 pazsan 292:
293: \ \ ticks
294:
295: : name>comp ( nt -- w xt ) \ gforth
1.15 crook 296: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 297: (name>comp)
298: 1 = if
299: ['] execute
300: else
301: ['] compile,
302: then ;
303:
304: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
305: (') postpone ALiteral ; immediate restrict
306:
307: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 308: \g @i{xt} represents @i{name}'s interpretation
309: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 310: \g interpretation semantics.
311: ' postpone ALiteral ; immediate restrict
312:
1.5 anton 313: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 314: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 315: (') name>comp ;
316:
317: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 318: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 319: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
320:
1.18 jwilke 321: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 322: \g Compile the compilation semantics represented by the
323: \g compilation token @i{w xt}.
1.18 jwilke 324: dup ['] execute =
325: if
326: drop compile,
327: else
1.61 pazsan 328: swap POSTPONE aliteral compile,
1.18 jwilke 329: then ;
330:
331: : POSTPONE ( "name" -- ) \ core
332: \g Compiles the compilation semantics of @i{name}.
1.48 anton 333: COMP' postpone, ; immediate
1.18 jwilke 334:
1.1 pazsan 335: \ \ recurse 17may93jaw
336:
337: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 338: \g Call the current definition.
1.56 anton 339: latestxt compile, ; immediate restrict
1.1 pazsan 340:
341: \ \ compiler loop
342:
1.72 anton 343: : compiler1 ( c-addr u -- ... xt )
1.1 pazsan 344: 2dup find-name dup
345: if ( c-addr u nt )
1.72 anton 346: nip nip name>comp
1.1 pazsan 347: else
348: drop
1.72 anton 349: 2dup 2>r snumber? dup
1.1 pazsan 350: IF
351: 0>
352: IF
1.72 anton 353: ['] 2literal
354: ELSE
355: ['] literal
1.1 pazsan 356: THEN
1.72 anton 357: 2rdrop
1.1 pazsan 358: ELSE
1.72 anton 359: drop 2r> compiler-notfound1
1.1 pazsan 360: THEN
361: then ;
362:
1.22 crook 363: : [ ( -- ) \ core left-bracket
1.8 crook 364: \G Enter interpretation state. Immediate word.
1.72 anton 365: ['] interpreter1 IS parser1 state off ; immediate
1.1 pazsan 366:
367: : ] ( -- ) \ core right-bracket
1.8 crook 368: \G Enter compilation state.
1.72 anton 369: ['] compiler1 IS parser1 state on ;
1.1 pazsan 370:
371: \ \ Strings 22feb93py
372:
1.44 anton 373: : S, ( addr u -- )
1.45 anton 374: \ allot string as counted string
1.44 anton 375: here over char+ allot place align ;
1.45 anton 376:
377: : mem, ( addr u -- )
378: \ allot the memory block HERE (do alignment yourself)
379: here over allot swap move ;
1.1 pazsan 380:
1.44 anton 381: : ," ( "string"<"> -- )
382: [char] " parse s, ;
1.1 pazsan 383:
384: \ \ Header states 23feb93py
385:
386: : cset ( bmask c-addr -- )
1.30 anton 387: tuck @ or swap ! ;
1.1 pazsan 388:
389: : creset ( bmask c-addr -- )
1.30 anton 390: tuck @ swap invert and swap ! ;
1.1 pazsan 391:
392: : ctoggle ( bmask c-addr -- )
1.30 anton 393: tuck @ xor swap ! ;
1.1 pazsan 394:
395: : lastflags ( -- c-addr )
396: \ the address of the flags byte in the last header
397: \ aborts if the last defined word was headerless
1.56 anton 398: latest dup 0= abort" last word was headerless" cell+ ;
1.1 pazsan 399:
400: : immediate ( -- ) \ core
1.10 crook 401: \G Make the compilation semantics of a word be to @code{execute}
402: \G the execution semantics.
1.1 pazsan 403: immediate-mask lastflags cset ;
404:
405: : restrict ( -- ) \ gforth
1.10 crook 406: \G A synonym for @code{compile-only}
1.1 pazsan 407: restrict-mask lastflags cset ;
1.18 jwilke 408:
1.1 pazsan 409: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 410: \G Remove the interpretation semantics of a word.
1.1 pazsan 411:
412: \ \ Create Variable User Constant 17mar93py
413:
1.15 crook 414: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 415: Header reveal
416: alias-mask lastflags creset
417: dup A, lastcfa ! ;
418:
419: doer? :dovar [IF]
420:
421: : Create ( "name" -- ) \ core
422: Header reveal dovar: cfa, ;
423: [ELSE]
424:
425: : Create ( "name" -- ) \ core
426: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
427: [THEN]
428:
429: : Variable ( "name" -- ) \ core
430: Create 0 , ;
431:
432: : AVariable ( "name" -- ) \ gforth
433: Create 0 A, ;
434:
1.22 crook 435: : 2Variable ( "name" -- ) \ double two-variable
1.1 pazsan 436: create 0 , 0 , ;
437:
1.75 pazsan 438: has? no-userspace 0= [IF]
1.21 crook 439: : uallot ( n -- ) \ gforth
440: udp @ swap udp +! ;
1.1 pazsan 441:
442: doer? :douser [IF]
443:
444: : User ( "name" -- ) \ gforth
445: Header reveal douser: cfa, cell uallot , ;
446:
447: : AUser ( "name" -- ) \ gforth
448: User ;
449: [ELSE]
450:
451: : User Create cell uallot , DOES> @ up @ + ;
452:
453: : AUser User ;
1.75 pazsan 454: [THEN]
1.1 pazsan 455: [THEN]
456:
457: doer? :docon [IF]
458: : (Constant) Header reveal docon: cfa, ;
459: [ELSE]
460: : (Constant) Create DOES> @ ;
461: [THEN]
462:
1.76 pazsan 463: doer? :dovalue [IF]
464: : (Value) Header reveal dovalue: cfa, ;
465: [ELSE]
466: has? rom [IF]
467: : (Value) Create DOES> @ @ ;
468: [ELSE]
469: : (Value) Create DOES> @ ;
470: [THEN]
471: [THEN]
472:
1.1 pazsan 473: : Constant ( w "name" -- ) \ core
1.15 crook 474: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 475: \G
1.15 crook 476: \G @i{name} execution: @i{-- w}
1.1 pazsan 477: (Constant) , ;
478:
479: : AConstant ( addr "name" -- ) \ gforth
480: (Constant) A, ;
481:
482: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 483: (Value) , ;
1.1 pazsan 484:
1.37 jwilke 485: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 486: (Value) A, ;
1.37 jwilke 487:
1.22 crook 488: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 489: Create ( w1 w2 "name" -- )
490: 2,
491: DOES> ( -- w1 w2 )
492: 2@ ;
493:
494: doer? :dofield [IF]
495: : (Field) Header reveal dofield: cfa, ;
496: [ELSE]
497: : (Field) Create DOES> @ + ;
498: [THEN]
1.39 pazsan 499:
500: \ \ interpret/compile:
501:
502: struct
503: >body
504: cell% field interpret/compile-int
505: cell% field interpret/compile-comp
506: end-struct interpret/compile-struct
507:
508: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
509: Create immediate swap A, A,
510: DOES>
511: abort" executed primary cfa of an interpret/compile: word" ;
512: \ state @ IF cell+ THEN perform ;
513:
1.1 pazsan 514: \ IS Defer What's Defers TO 24feb93py
515:
1.68 anton 516: defer defer-default ( -- )
1.69 anton 517: ' abort is defer-default
518: \ default action for deferred words (overridden by a warning later)
1.67 anton 519:
1.1 pazsan 520: doer? :dodefer [IF]
521:
522: : Defer ( "name" -- ) \ gforth
1.67 anton 523: \G Define a deferred word @i{name}; its execution semantics can be
524: \G set with @code{defer!} or @code{is} (and they have to, before first
525: \G executing @i{name}.
1.1 pazsan 526: Header Reveal dodefer: cfa,
1.67 anton 527: ['] defer-default A, ;
1.18 jwilke 528:
1.1 pazsan 529: [ELSE]
530:
1.77 pazsan 531: has? rom [IF]
532: : Defer ( "name" -- ) \ gforth
533: Create ['] defer-default A,
534: DOES> @ @ execute ;
535: [ELSE]
536: : Defer ( "name" -- ) \ gforth
537: Create ['] defer-default A,
538: DOES> @ execute ;
539: [THEN]
1.1 pazsan 540: [THEN]
541:
1.67 anton 542: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
543: \G @i{xt} represents the word currently associated with the deferred
544: \G word @i{xt-deferred}.
545: >body @ ;
546:
1.25 anton 547: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
548: \G Compiles the present contents of the deferred word @i{name}
549: \G into the current definition. I.e., this produces static
550: \G binding as if @i{name} was not deferred.
1.67 anton 551: ' defer@ compile, ; immediate
1.18 jwilke 552:
553: :noname
554: dodoes, here !does ]
555: defstart :-hook ;
556: :noname
557: ;-hook ?struc
558: [ has? xconds [IF] ] exit-like [ [THEN] ]
1.64 anton 559: here 5 cells + postpone aliteral postpone (does>2) [compile] exit
1.80 pazsan 560: [ has? peephole [IF] ] finish-code [ [THEN] ] dodoes,
1.18 jwilke 561: defstart :-hook ;
562: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
563:
1.73 anton 564: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 565: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
566: >body ! ;
567:
1.20 anton 568: : <IS> ( "name" xt -- ) \ gforth
569: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 570: ' defer! ;
1.20 anton 571:
572: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
573: \g At run-time, changes the @code{defer}red word @var{name} to
574: \g execute @var{xt}.
1.67 anton 575: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 576:
1.20 anton 577: ' <IS>
1.18 jwilke 578: ' [IS]
1.67 anton 579: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
580: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
581: \G Its compilation semantics parses at compile time.
1.18 jwilke 582:
1.20 anton 583: ' <IS>
584: ' [IS]
585: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 586:
587: : interpret/compile? ( xt -- flag )
588: >does-code ['] DOES> >does-code = ;
1.1 pazsan 589:
590: \ \ : ; 24feb93py
591:
592: defer :-hook ( sys1 -- sys2 )
593:
594: defer ;-hook ( sys2 -- sys1 )
595:
1.16 jwilke 596: 0 Constant defstart
597:
1.14 jwilke 598: [IFDEF] docol,
599: : (:noname) ( -- colon-sys )
600: \ common factor of : and :noname
1.34 anton 601: docol, ]comp
1.14 jwilke 602: [ELSE]
1.7 anton 603: : (:noname) ( -- colon-sys )
604: \ common factor of : and :noname
1.34 anton 605: docol: cfa,
1.14 jwilke 606: [THEN]
1.40 anton 607: defstart ] :-hook ;
1.7 anton 608:
1.1 pazsan 609: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 610: Header (:noname) ;
611:
612: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
613: 0 last !
614: cfalign here (:noname) ;
1.1 pazsan 615:
1.14 jwilke 616: [IFDEF] fini,
617: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
618: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
619: [ELSE]
1.1 pazsan 620: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 621: ;-hook ?struc [compile] exit
622: [ has? peephole [IF] ] finish-code [ [THEN] ]
623: reveal postpone [ ; immediate restrict
1.14 jwilke 624: [THEN]
1.1 pazsan 625:
626: \ \ Search list handling: reveal words, recursive 23feb93py
627:
628: : last? ( -- false / nfa nfa )
1.56 anton 629: latest ?dup ;
1.1 pazsan 630:
1.80 pazsan 631: has? ec 0= [IF]
1.1 pazsan 632: : (reveal) ( nt wid -- )
1.3 pazsan 633: wordlist-id dup >r
1.1 pazsan 634: @ over ( name>link ) !
635: r> ! ;
636:
637: \ make entry in wordlist-map
638: ' (reveal) f83search reveal-method !
1.80 pazsan 639: [ELSE]
640: : (reveal) ( nt wid -- )
1.82 ! pazsan 641: dup >r @ over ! r> ! ;
1.80 pazsan 642: [THEN]
1.1 pazsan 643:
644: Variable warnings ( -- addr ) \ gforth
645: G -1 warnings T !
646:
647: : check-shadow ( addr count wid -- )
1.2 pazsan 648: \G prints a warning if the string is already present in the wordlist
649: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
650: >stderr
651: ." redefined " name>string 2dup type
1.43 anton 652: str= 0= if
1.2 pazsan 653: ." with " type
654: else
655: 2drop
656: then
657: space space EXIT
658: then
659: 2drop 2drop ;
1.1 pazsan 660:
661: : reveal ( -- ) \ gforth
662: last?
663: if \ the last word has a header
664: dup ( name>link ) @ 1 and
665: if \ it is still hidden
666: dup ( name>link ) @ 1 xor ( nt wid )
667: 2dup >r name>string r> check-shadow ( nt wid )
1.80 pazsan 668: [ has? ec [IF] ]
669: (reveal)
670: [ [ELSE] ]
671: dup wordlist-map @ reveal-method perform
672: [ [THEN] ]
1.1 pazsan 673: else
674: drop
675: then
676: then ;
677:
1.80 pazsan 678: has? EC 0= [IF]
1.1 pazsan 679: : rehash ( wid -- )
680: dup wordlist-map @ rehash-method perform ;
1.80 pazsan 681: [THEN]
1.1 pazsan 682:
683: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 684: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 685: \g recursively.
686: immediate restrict
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