Annotation of gforth/kernel/comp.fs, revision 1.95
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.95 ! anton 3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 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
1.93 anton 9: \ as published by the Free Software Foundation, either version 3
1.6 anton 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
1.93 anton 18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.6 anton 19:
1.1 pazsan 20: \ \ Revisions-Log
21:
22: \ put in seperate file 14sep97jaw
23:
24: \ \ here allot , c, A, 17dec92py
25:
1.14 jwilke 26: [IFUNDEF] allot
27: [IFUNDEF] forthstart
28: : allot ( n -- ) \ core
29: dup unused u> -8 and throw
30: dp +! ;
31: [THEN]
32: [THEN]
33:
34: \ we default to this version if we have nothing else 05May99jaw
35: [IFUNDEF] allot
1.1 pazsan 36: : allot ( n -- ) \ core
1.23 anton 37: \G Reserve @i{n} address units of data space without
38: \G initialization. @i{n} is a signed number, passing a negative
39: \G @i{n} releases memory. In ANS Forth you can only deallocate
40: \G memory from the current contiguous region in this way. In
41: \G Gforth you can deallocate anything in this way but named words.
42: \G The system does not check this restriction.
1.12 anton 43: here +
44: dup 1- usable-dictionary-end forthstart within -8 and throw
45: dp ! ;
1.14 jwilke 46: [THEN]
1.1 pazsan 47:
1.22 crook 48: : c, ( c -- ) \ core c-comma
1.15 crook 49: \G Reserve data space for one char and store @i{c} in the space.
1.84 pazsan 50: here 1 chars allot [ has? flash [IF] ] flashc! [ [ELSE] ] c! [ [THEN] ] ;
1.1 pazsan 51:
1.22 crook 52: : , ( w -- ) \ core comma
1.15 crook 53: \G Reserve data space for one cell and store @i{w} in the space.
1.84 pazsan 54: here cell allot [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] ;
1.1 pazsan 55:
56: : 2, ( w1 w2 -- ) \ gforth
1.15 crook 57: \G Reserve data space for two cells and store the double @i{w1
1.24 anton 58: \G w2} there, @i{w2} first (lower address).
1.84 pazsan 59: here 2 cells allot [ has? flash [IF] ] tuck flash! cell+ flash!
60: [ [ELSE] ] 2! [ [THEN] ] ;
1.1 pazsan 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
1.83 pazsan 108: dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
1.84 pazsan 109: [ has? flash [IF] ]
110: bounds ?DO I c@ c, LOOP
111: [ [ELSE] ]
112: here swap chars dup allot move
113: [ [THEN] ] ;
1.1 pazsan 114:
1.30 anton 115: : longstring, ( c-addr u -- ) \ gforth
1.55 anton 116: \G puts down string as longcstring
1.30 anton 117: dup , here swap chars dup allot move ;
118:
1.1 pazsan 119: : header, ( c-addr u -- ) \ gforth
120: name-too-long?
1.53 anton 121: dup max-name-length @ max max-name-length !
1.1 pazsan 122: align here last !
1.94 pazsan 123: [ has? ec [IF] ]
1.83 pazsan 124: -1 A,
125: [ [ELSE] ]
1.1 pazsan 126: current @ 1 or A, \ link field; before revealing, it contains the
127: \ tagged reveal-into wordlist
1.83 pazsan 128: [ [THEN] ]
1.78 pazsan 129: [ has? f83headerstring [IF] ]
130: string,
131: [ [ELSE] ]
1.83 pazsan 132: longstring, alias-mask lastflags cset
1.78 pazsan 133: [ [THEN] ]
1.83 pazsan 134: cfalign ;
1.1 pazsan 135:
136: : input-stream-header ( "name" -- )
1.80 pazsan 137: parse-name name-too-short? header, ;
1.1 pazsan 138:
139: : input-stream ( -- ) \ general
140: \G switches back to getting the name from the input stream ;
141: ['] input-stream-header IS (header) ;
142:
143: ' input-stream-header IS (header)
144:
1.32 anton 145: 2variable nextname-string
1.1 pazsan 146:
1.33 pazsan 147: has? OS [IF]
1.1 pazsan 148: : nextname-header ( -- )
1.32 anton 149: nextname-string 2@ header,
150: nextname-string free-mem-var
1.1 pazsan 151: input-stream ;
1.33 pazsan 152: [THEN]
1.1 pazsan 153:
154: \ the next name is given in the string
155:
1.33 pazsan 156: has? OS [IF]
1.1 pazsan 157: : nextname ( c-addr u -- ) \ gforth
1.19 anton 158: \g The next defined word will have the name @var{c-addr u}; the
159: \g defining word will leave the input stream alone.
1.1 pazsan 160: name-too-long?
1.32 anton 161: nextname-string free-mem-var
162: save-mem nextname-string 2!
1.1 pazsan 163: ['] nextname-header IS (header) ;
1.33 pazsan 164: [THEN]
1.1 pazsan 165:
166: : noname-header ( -- )
167: 0 last ! cfalign
168: input-stream ;
169:
170: : noname ( -- ) \ gforth
1.19 anton 171: \g The next defined word will be anonymous. The defining word will
172: \g leave the input stream alone. The xt of the defined word will
1.56 anton 173: \g be given by @code{latestxt}.
1.1 pazsan 174: ['] noname-header IS (header) ;
175:
1.56 anton 176: : latestxt ( -- xt ) \ gforth
1.15 crook 177: \G @i{xt} is the execution token of the last word defined.
1.13 crook 178: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 179: lastcfa @ ;
180:
1.56 anton 181: ' latestxt alias lastxt \ gforth-obsolete
182: \G old name for @code{latestxt}.
183:
184: : latest ( -- nt ) \ gforth
185: \G @var{nt} is the name token of the last word defined; it is 0 if the
186: \G last word has no name.
187: last @ ;
188:
1.1 pazsan 189: \ \ literals 17dec92py
190:
191: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 192: \G Compilation semantics: compile the run-time semantics.@*
193: \G Run-time Semantics: push @i{n}.@*
194: \G Interpretation semantics: undefined.
1.14 jwilke 195: [ [IFDEF] lit, ]
196: lit,
197: [ [ELSE] ]
1.27 anton 198: postpone lit ,
1.14 jwilke 199: [ [THEN] ] ; immediate restrict
1.1 pazsan 200:
1.72 anton 201: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
202: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
203: \G placed on the stack. Interpretation semantics are undefined.
204: swap postpone Literal postpone Literal ; immediate restrict
205:
1.1 pazsan 206: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 207: [ [IFDEF] alit, ]
208: alit,
209: [ [ELSE] ]
210: postpone lit A,
211: [ [THEN] ] ; immediate restrict
1.1 pazsan 212:
1.70 pazsan 213: Defer char@ ( addr u -- char addr' u' )
214: :noname over c@ -rot 1 /string ; IS char@
215:
1.8 crook 216: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 217: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
218: \G display code representing the first character of @i{ccc}.
1.87 pazsan 219: parse-name char@ 2drop ;
1.1 pazsan 220:
1.8 crook 221: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 222: \G Compilation: skip leading spaces. Parse the string
1.15 crook 223: \G @i{ccc}. Run-time: return @i{c}, the display code
224: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 225: \G semantics for this word are undefined.
1.1 pazsan 226: char postpone Literal ; immediate restrict
227:
228: \ \ threading 17mar93py
229:
230: : cfa, ( code-address -- ) \ gforth cfa-comma
231: here
232: dup lastcfa !
1.84 pazsan 233: [ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
234: code-address! ;
1.1 pazsan 235:
1.14 jwilke 236: [IFUNDEF] compile,
1.34 anton 237: defer compile, ( xt -- ) \ core-ext compile-comma
238: \G Compile the word represented by the execution token @i{xt}
239: \G into the current definition.
240:
241: ' , is compile,
1.14 jwilke 242: [THEN]
1.1 pazsan 243:
1.80 pazsan 244: has? ec 0= [IF]
1.40 anton 245: defer basic-block-end ( -- )
246:
1.60 anton 247: :noname ( -- )
248: 0 compile-prim1 ;
249: is basic-block-end
1.80 pazsan 250: [THEN]
1.40 anton 251:
1.36 pazsan 252: has? peephole [IF]
1.40 anton 253:
254: \ dynamic only
1.49 anton 255: : peephole-compile, ( xt -- )
256: \ compile xt, appending its code to the current dynamic superinstruction
257: here swap , compile-prim1 ;
1.38 anton 258:
1.35 anton 259: : compile-to-prims, ( xt -- )
260: \G compile xt to use primitives (and their peephole optimization)
261: \G instead of ","-ing the xt.
262: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 263: dup >does-code if
1.66 anton 264: ['] does-exec peephole-compile, , EXIT
265: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 266: then
267: dup >code-address CASE
1.91 pazsan 268: dovalue: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
269: docon: OF >body @ ['] lit peephole-compile, , EXIT ENDOF
1.66 anton 270: \ docon: OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42 anton 271: \ docon is also used by VALUEs, so don't @ at compile time
1.66 anton 272: docol: OF >body ['] call peephole-compile, , EXIT ENDOF
273: dovar: OF >body ['] lit peephole-compile, , EXIT ENDOF
274: douser: OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
275: dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
276: dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
277: \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.48 anton 278: \ code words and ;code-defined words (code words could be optimized):
1.66 anton 279: dup in-dictionary? IF drop POSTPONE literal ['] execute peephole-compile, EXIT THEN
1.35 anton 280: ENDCASE
1.49 anton 281: peephole-compile, ;
1.35 anton 282:
283: ' compile-to-prims, IS compile,
1.36 pazsan 284: [ELSE]
285: ' , is compile,
286: [THEN]
1.34 anton 287:
1.1 pazsan 288: : !does ( addr -- ) \ gforth store-does
1.56 anton 289: latestxt does-code! ;
1.1 pazsan 290:
1.65 anton 291: \ !! unused, but ifdefed/gosted in some places
1.1 pazsan 292: : (does>) ( R: addr -- )
1.62 anton 293: r> cfaligned /does-handler + !does ; \ !! no gforth-native
1.1 pazsan 294:
1.64 anton 295: : (does>2) ( addr -- )
296: cfaligned /does-handler + !does ;
297:
1.1 pazsan 298: : dodoes, ( -- )
299: cfalign here /does-handler allot does-handler! ;
300:
1.61 pazsan 301: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63 anton 302: true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1 pazsan 303:
304: \ \ ticks
305:
1.90 anton 306: : name>comp ( nt -- w xt ) \ gforth name-to-comp
1.15 crook 307: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 308: (name>comp)
309: 1 = if
310: ['] execute
311: else
312: ['] compile,
313: then ;
314:
315: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
316: (') postpone ALiteral ; immediate restrict
317:
318: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 319: \g @i{xt} represents @i{name}'s interpretation
320: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 321: \g interpretation semantics.
322: ' postpone ALiteral ; immediate restrict
323:
1.5 anton 324: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 325: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 326: (') name>comp ;
327:
328: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 329: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 330: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
331:
1.18 jwilke 332: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 333: \g Compile the compilation semantics represented by the
334: \g compilation token @i{w xt}.
1.18 jwilke 335: dup ['] execute =
336: if
337: drop compile,
338: else
1.61 pazsan 339: swap POSTPONE aliteral compile,
1.18 jwilke 340: then ;
341:
342: : POSTPONE ( "name" -- ) \ core
343: \g Compiles the compilation semantics of @i{name}.
1.48 anton 344: COMP' postpone, ; immediate
1.18 jwilke 345:
1.1 pazsan 346: \ \ recurse 17may93jaw
347:
348: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 349: \g Call the current definition.
1.56 anton 350: latestxt compile, ; immediate restrict
1.1 pazsan 351:
352: \ \ compiler loop
353:
1.72 anton 354: : compiler1 ( c-addr u -- ... xt )
1.1 pazsan 355: 2dup find-name dup
356: if ( c-addr u nt )
1.72 anton 357: nip nip name>comp
1.1 pazsan 358: else
359: drop
1.72 anton 360: 2dup 2>r snumber? dup
1.1 pazsan 361: IF
362: 0>
363: IF
1.72 anton 364: ['] 2literal
365: ELSE
366: ['] literal
1.1 pazsan 367: THEN
1.72 anton 368: 2rdrop
1.1 pazsan 369: ELSE
1.72 anton 370: drop 2r> compiler-notfound1
1.1 pazsan 371: THEN
372: then ;
373:
1.22 crook 374: : [ ( -- ) \ core left-bracket
1.8 crook 375: \G Enter interpretation state. Immediate word.
1.72 anton 376: ['] interpreter1 IS parser1 state off ; immediate
1.1 pazsan 377:
378: : ] ( -- ) \ core right-bracket
1.8 crook 379: \G Enter compilation state.
1.72 anton 380: ['] compiler1 IS parser1 state on ;
1.1 pazsan 381:
382: \ \ Strings 22feb93py
383:
1.44 anton 384: : S, ( addr u -- )
1.45 anton 385: \ allot string as counted string
1.84 pazsan 386: [ has? flash [IF] ]
387: dup c, bounds ?DO I c@ c, LOOP
388: [ [ELSE] ]
389: here over char+ allot place align
390: [ [THEN] ] ;
1.45 anton 391:
392: : mem, ( addr u -- )
393: \ allot the memory block HERE (do alignment yourself)
1.84 pazsan 394: [ has? flash [IF] ]
395: bounds ?DO I c@ c, LOOP
396: [ [ELSE] ]
397: here over allot swap move
398: [ [THEN] ] ;
1.1 pazsan 399:
1.44 anton 400: : ," ( "string"<"> -- )
401: [char] " parse s, ;
1.1 pazsan 402:
403: \ \ Header states 23feb93py
404:
1.83 pazsan 405: \ problematic only for big endian machines
406:
407: has? f83headerstring [IF]
408: : cset ( bmask c-addr -- )
409: tuck c@ or swap c! ;
410:
411: : creset ( bmask c-addr -- )
412: tuck c@ swap invert and swap c! ;
413:
414: : ctoggle ( bmask c-addr -- )
415: tuck c@ xor swap c! ;
416: [ELSE]
1.1 pazsan 417: : cset ( bmask c-addr -- )
1.30 anton 418: tuck @ or swap ! ;
1.1 pazsan 419:
420: : creset ( bmask c-addr -- )
1.30 anton 421: tuck @ swap invert and swap ! ;
1.1 pazsan 422:
423: : ctoggle ( bmask c-addr -- )
1.30 anton 424: tuck @ xor swap ! ;
1.83 pazsan 425: [THEN]
1.1 pazsan 426:
427: : lastflags ( -- c-addr )
428: \ the address of the flags byte in the last header
429: \ aborts if the last defined word was headerless
1.56 anton 430: latest dup 0= abort" last word was headerless" cell+ ;
1.1 pazsan 431:
432: : immediate ( -- ) \ core
1.10 crook 433: \G Make the compilation semantics of a word be to @code{execute}
434: \G the execution semantics.
1.83 pazsan 435: immediate-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.1 pazsan 436:
437: : restrict ( -- ) \ gforth
1.10 crook 438: \G A synonym for @code{compile-only}
1.83 pazsan 439: restrict-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.18 jwilke 440:
1.1 pazsan 441: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 442: \G Remove the interpretation semantics of a word.
1.1 pazsan 443:
444: \ \ Create Variable User Constant 17mar93py
445:
1.15 crook 446: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 447: Header reveal
448: alias-mask lastflags creset
449: dup A, lastcfa ! ;
450:
451: doer? :dovar [IF]
452:
453: : Create ( "name" -- ) \ core
454: Header reveal dovar: cfa, ;
455: [ELSE]
456:
457: : Create ( "name" -- ) \ core
458: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
459: [THEN]
460:
1.85 pazsan 461: has? flash [IF]
1.87 pazsan 462: : (variable) dpp @ normal-dp = IF Create dpp @
1.85 pazsan 463: ELSE normal-dp @ Constant dpp @ ram THEN ;
464: : Variable ( "name" -- ) \ core
465: (Variable) 0 , dpp ! ;
466:
467: : AVariable ( "name" -- ) \ gforth
468: (Variable) 0 A, dpp ! ;
469:
470: : 2Variable ( "name" -- ) \ double two-variable
471: (Variable) 0 , 0 , dpp ! ;
472: [ELSE]
1.1 pazsan 473: : Variable ( "name" -- ) \ core
474: Create 0 , ;
475:
476: : AVariable ( "name" -- ) \ gforth
477: Create 0 A, ;
478:
1.22 crook 479: : 2Variable ( "name" -- ) \ double two-variable
1.85 pazsan 480: Create 0 , 0 , ;
481: [THEN]
1.1 pazsan 482:
1.75 pazsan 483: has? no-userspace 0= [IF]
1.21 crook 484: : uallot ( n -- ) \ gforth
485: udp @ swap udp +! ;
1.1 pazsan 486:
487: doer? :douser [IF]
488:
489: : User ( "name" -- ) \ gforth
490: Header reveal douser: cfa, cell uallot , ;
491:
492: : AUser ( "name" -- ) \ gforth
493: User ;
494: [ELSE]
495:
496: : User Create cell uallot , DOES> @ up @ + ;
497:
498: : AUser User ;
1.75 pazsan 499: [THEN]
1.1 pazsan 500: [THEN]
501:
502: doer? :docon [IF]
503: : (Constant) Header reveal docon: cfa, ;
504: [ELSE]
505: : (Constant) Create DOES> @ ;
506: [THEN]
507:
1.76 pazsan 508: doer? :dovalue [IF]
509: : (Value) Header reveal dovalue: cfa, ;
510: [ELSE]
511: has? rom [IF]
512: : (Value) Create DOES> @ @ ;
513: [ELSE]
514: : (Value) Create DOES> @ ;
515: [THEN]
516: [THEN]
517:
1.1 pazsan 518: : Constant ( w "name" -- ) \ core
1.15 crook 519: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 520: \G
1.15 crook 521: \G @i{name} execution: @i{-- w}
1.1 pazsan 522: (Constant) , ;
523:
524: : AConstant ( addr "name" -- ) \ gforth
525: (Constant) A, ;
526:
1.84 pazsan 527: has? flash [IF]
528: : Value ( w "name" -- ) \ core-ext
529: (Value) dpp @ >r here cell allot >r
530: ram here >r , r> r> flash! r> dpp ! ;
531:
532: ' Value alias AValue
533: [ELSE]
1.1 pazsan 534: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 535: (Value) , ;
1.1 pazsan 536:
1.37 jwilke 537: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 538: (Value) A, ;
1.84 pazsan 539: [THEN]
1.37 jwilke 540:
1.22 crook 541: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 542: Create ( w1 w2 "name" -- )
543: 2,
544: DOES> ( -- w1 w2 )
545: 2@ ;
546:
547: doer? :dofield [IF]
548: : (Field) Header reveal dofield: cfa, ;
549: [ELSE]
550: : (Field) Create DOES> @ + ;
551: [THEN]
1.39 pazsan 552:
553: \ \ interpret/compile:
554:
555: struct
556: >body
557: cell% field interpret/compile-int
558: cell% field interpret/compile-comp
559: end-struct interpret/compile-struct
560:
561: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
562: Create immediate swap A, A,
563: DOES>
564: abort" executed primary cfa of an interpret/compile: word" ;
565: \ state @ IF cell+ THEN perform ;
566:
1.1 pazsan 567: \ IS Defer What's Defers TO 24feb93py
568:
1.68 anton 569: defer defer-default ( -- )
1.69 anton 570: ' abort is defer-default
571: \ default action for deferred words (overridden by a warning later)
1.67 anton 572:
1.1 pazsan 573: doer? :dodefer [IF]
574:
575: : Defer ( "name" -- ) \ gforth
1.67 anton 576: \G Define a deferred word @i{name}; its execution semantics can be
577: \G set with @code{defer!} or @code{is} (and they have to, before first
578: \G executing @i{name}.
1.1 pazsan 579: Header Reveal dodefer: cfa,
1.86 pazsan 580: [ has? rom [IF] ] here >r cell allot
581: dpp @ ram here r> flash! ['] defer-default A, dpp !
582: [ [ELSE] ] ['] defer-default A, [ [THEN] ] ;
1.18 jwilke 583:
1.1 pazsan 584: [ELSE]
585:
1.77 pazsan 586: has? rom [IF]
587: : Defer ( "name" -- ) \ gforth
1.86 pazsan 588: Create here >r cell allot
589: dpp @ ram here r> flash! ['] defer-default A, dpp !
1.77 pazsan 590: DOES> @ @ execute ;
591: [ELSE]
592: : Defer ( "name" -- ) \ gforth
593: Create ['] defer-default A,
594: DOES> @ execute ;
595: [THEN]
1.1 pazsan 596: [THEN]
597:
1.67 anton 598: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
599: \G @i{xt} represents the word currently associated with the deferred
600: \G word @i{xt-deferred}.
1.86 pazsan 601: >body @ [ has? rom [IF] ] @ [ [THEN] ] ;
1.67 anton 602:
1.25 anton 603: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
604: \G Compiles the present contents of the deferred word @i{name}
605: \G into the current definition. I.e., this produces static
606: \G binding as if @i{name} was not deferred.
1.67 anton 607: ' defer@ compile, ; immediate
1.18 jwilke 608:
609: :noname
610: dodoes, here !does ]
611: defstart :-hook ;
612: :noname
613: ;-hook ?struc
614: [ has? xconds [IF] ] exit-like [ [THEN] ]
1.84 pazsan 615: here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
616: postpone aliteral postpone (does>2) [compile] exit
1.80 pazsan 617: [ has? peephole [IF] ] finish-code [ [THEN] ] dodoes,
1.18 jwilke 618: defstart :-hook ;
619: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
620:
1.73 anton 621: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 622: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
1.86 pazsan 623: >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
1.67 anton 624:
1.20 anton 625: : <IS> ( "name" xt -- ) \ gforth
626: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 627: ' defer! ;
1.20 anton 628:
629: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
630: \g At run-time, changes the @code{defer}red word @var{name} to
631: \g execute @var{xt}.
1.67 anton 632: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 633:
1.20 anton 634: ' <IS>
1.18 jwilke 635: ' [IS]
1.67 anton 636: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
637: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
638: \G Its compilation semantics parses at compile time.
1.18 jwilke 639:
1.20 anton 640: ' <IS>
641: ' [IS]
642: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 643:
644: : interpret/compile? ( xt -- flag )
645: >does-code ['] DOES> >does-code = ;
1.1 pazsan 646:
647: \ \ : ; 24feb93py
648:
649: defer :-hook ( sys1 -- sys2 )
650:
651: defer ;-hook ( sys2 -- sys1 )
652:
1.16 jwilke 653: 0 Constant defstart
654:
1.14 jwilke 655: [IFDEF] docol,
656: : (:noname) ( -- colon-sys )
657: \ common factor of : and :noname
1.34 anton 658: docol, ]comp
1.14 jwilke 659: [ELSE]
1.7 anton 660: : (:noname) ( -- colon-sys )
661: \ common factor of : and :noname
1.34 anton 662: docol: cfa,
1.14 jwilke 663: [THEN]
1.40 anton 664: defstart ] :-hook ;
1.7 anton 665:
1.1 pazsan 666: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 667: Header (:noname) ;
668:
669: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
670: 0 last !
671: cfalign here (:noname) ;
1.1 pazsan 672:
1.14 jwilke 673: [IFDEF] fini,
674: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
675: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
676: [ELSE]
1.1 pazsan 677: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 678: ;-hook ?struc [compile] exit
679: [ has? peephole [IF] ] finish-code [ [THEN] ]
680: reveal postpone [ ; immediate restrict
1.14 jwilke 681: [THEN]
1.1 pazsan 682:
683: \ \ Search list handling: reveal words, recursive 23feb93py
684:
685: : last? ( -- false / nfa nfa )
1.56 anton 686: latest ?dup ;
1.1 pazsan 687:
1.83 pazsan 688: Variable warnings ( -- addr ) \ gforth
689: G -1 warnings T !
690:
691: has? ec [IF]
692: : reveal ( -- ) \ gforth
693: last?
694: if \ the last word has a header
695: dup ( name>link ) @ -1 =
696: if \ it is still hidden
1.88 pazsan 697: forth-wordlist dup >r @ over
1.84 pazsan 698: [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] r> !
1.83 pazsan 699: else
700: drop
701: then
702: then ;
703: [ELSE]
1.1 pazsan 704: : (reveal) ( nt wid -- )
1.3 pazsan 705: wordlist-id dup >r
1.1 pazsan 706: @ over ( name>link ) !
707: r> ! ;
708:
709: \ make entry in wordlist-map
710: ' (reveal) f83search reveal-method !
711:
712: : check-shadow ( addr count wid -- )
1.2 pazsan 713: \G prints a warning if the string is already present in the wordlist
714: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
715: >stderr
716: ." redefined " name>string 2dup type
1.43 anton 717: str= 0= if
1.2 pazsan 718: ." with " type
719: else
720: 2drop
721: then
722: space space EXIT
723: then
724: 2drop 2drop ;
1.1 pazsan 725:
726: : reveal ( -- ) \ gforth
727: last?
728: if \ the last word has a header
729: dup ( name>link ) @ 1 and
730: if \ it is still hidden
731: dup ( name>link ) @ 1 xor ( nt wid )
732: 2dup >r name>string r> check-shadow ( nt wid )
1.83 pazsan 733: dup wordlist-map @ reveal-method perform
1.1 pazsan 734: else
735: drop
736: then
737: then ;
738:
739: : rehash ( wid -- )
740: dup wordlist-map @ rehash-method perform ;
1.80 pazsan 741: [THEN]
1.1 pazsan 742:
743: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 744: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 745: \g recursively.
746: immediate restrict
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to comp.fs CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [gforth] / gforth / kernel