Annotation of gforth/kernel/comp.fs, revision 1.109
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.106 anton 3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2009,2010 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:
1.107 pazsan 72: has? ec 0= [IF]
1.22 crook 73: : falign ( -- ) \ float f-align
1.15 crook 74: \G If the data-space pointer is not float-aligned, reserve
75: \G enough space to align it.
1.1 pazsan 76: here dup faligned swap
77: ?DO
78: bl c,
79: LOOP ;
1.107 pazsan 80: [THEN]
1.1 pazsan 81:
1.9 anton 82: : maxalign ( -- ) \ gforth
1.23 anton 83: \G Align data-space pointer for all alignment requirements.
1.1 pazsan 84: here dup maxaligned swap
85: ?DO
86: bl c,
87: LOOP ;
88:
89: \ the code field is aligned if its body is maxaligned
90: ' maxalign Alias cfalign ( -- ) \ gforth
1.24 anton 91: \G Align data-space pointer for code field requirements (i.e., such
92: \G that the corresponding body is maxaligned).
1.1 pazsan 93:
94: ' , alias A, ( addr -- ) \ gforth
95:
96: ' NOOP ALIAS const
97:
98: \ \ Header 23feb93py
99:
100: \ input-stream, nextname and noname are quite ugly (passing
101: \ information through global variables), but they are useful for dealing
102: \ with existing/independent defining words
103:
104: : string, ( c-addr u -- ) \ gforth
105: \G puts down string as cstring
1.83 pazsan 106: dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
1.84 pazsan 107: [ has? flash [IF] ]
108: bounds ?DO I c@ c, LOOP
109: [ [ELSE] ]
110: here swap chars dup allot move
111: [ [THEN] ] ;
1.1 pazsan 112:
1.30 anton 113: : longstring, ( c-addr u -- ) \ gforth
1.55 anton 114: \G puts down string as longcstring
1.30 anton 115: dup , here swap chars dup allot move ;
116:
1.99 pazsan 117: [IFDEF] prelude-mask
1.96 anton 118: variable next-prelude
119:
120: : prelude, ( -- )
121: next-prelude @ if
122: align next-prelude @ ,
123: then ;
1.99 pazsan 124: [THEN]
1.96 anton 125:
1.1 pazsan 126: : header, ( c-addr u -- ) \ gforth
127: name-too-long?
1.53 anton 128: dup max-name-length @ max max-name-length !
1.99 pazsan 129: [ [IFDEF] prelude-mask ] prelude, [ [THEN] ]
1.1 pazsan 130: align here last !
1.94 pazsan 131: [ has? ec [IF] ]
1.83 pazsan 132: -1 A,
133: [ [ELSE] ]
1.1 pazsan 134: current @ 1 or A, \ link field; before revealing, it contains the
135: \ tagged reveal-into wordlist
1.83 pazsan 136: [ [THEN] ]
1.78 pazsan 137: [ has? f83headerstring [IF] ]
138: string,
139: [ [ELSE] ]
1.83 pazsan 140: longstring, alias-mask lastflags cset
1.96 anton 141: next-prelude @ 0<> prelude-mask and lastflags cset
142: next-prelude off
1.78 pazsan 143: [ [THEN] ]
1.83 pazsan 144: cfalign ;
1.1 pazsan 145:
1.107 pazsan 146: has? ec [IF]
147: : header ( "name" -- )
148: parse-name name-too-short? header, ;
149: [ELSE]
150: defer (header)
151: defer header ( -- ) \ gforth
152: ' (header) IS header
153:
1.1 pazsan 154: : input-stream-header ( "name" -- )
1.80 pazsan 155: parse-name name-too-short? header, ;
1.1 pazsan 156:
157: : input-stream ( -- ) \ general
158: \G switches back to getting the name from the input stream ;
159: ['] input-stream-header IS (header) ;
160:
161: ' input-stream-header IS (header)
162:
1.32 anton 163: 2variable nextname-string
1.1 pazsan 164:
165: : nextname-header ( -- )
1.32 anton 166: nextname-string 2@ header,
167: nextname-string free-mem-var
1.1 pazsan 168: input-stream ;
169:
170: \ the next name is given in the string
171:
172: : nextname ( c-addr u -- ) \ gforth
1.19 anton 173: \g The next defined word will have the name @var{c-addr u}; the
174: \g defining word will leave the input stream alone.
1.1 pazsan 175: name-too-long?
1.32 anton 176: nextname-string free-mem-var
177: save-mem nextname-string 2!
1.1 pazsan 178: ['] nextname-header IS (header) ;
179:
180: : noname-header ( -- )
181: 0 last ! cfalign
182: input-stream ;
183:
184: : noname ( -- ) \ gforth
1.19 anton 185: \g The next defined word will be anonymous. The defining word will
186: \g leave the input stream alone. The xt of the defined word will
1.56 anton 187: \g be given by @code{latestxt}.
1.1 pazsan 188: ['] noname-header IS (header) ;
1.107 pazsan 189: [THEN]
1.1 pazsan 190:
1.56 anton 191: : latestxt ( -- xt ) \ gforth
1.15 crook 192: \G @i{xt} is the execution token of the last word defined.
1.13 crook 193: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 194: lastcfa @ ;
195:
1.56 anton 196: ' latestxt alias lastxt \ gforth-obsolete
197: \G old name for @code{latestxt}.
198:
199: : latest ( -- nt ) \ gforth
200: \G @var{nt} is the name token of the last word defined; it is 0 if the
201: \G last word has no name.
202: last @ ;
203:
1.1 pazsan 204: \ \ literals 17dec92py
205:
206: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 207: \G Compilation semantics: compile the run-time semantics.@*
208: \G Run-time Semantics: push @i{n}.@*
209: \G Interpretation semantics: undefined.
1.14 jwilke 210: [ [IFDEF] lit, ]
211: lit,
212: [ [ELSE] ]
1.27 anton 213: postpone lit ,
1.14 jwilke 214: [ [THEN] ] ; immediate restrict
1.1 pazsan 215:
1.72 anton 216: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
217: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
218: \G placed on the stack. Interpretation semantics are undefined.
219: swap postpone Literal postpone Literal ; immediate restrict
220:
1.1 pazsan 221: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 222: [ [IFDEF] alit, ]
223: alit,
224: [ [ELSE] ]
225: postpone lit A,
226: [ [THEN] ] ; immediate restrict
1.1 pazsan 227:
1.70 pazsan 228: Defer char@ ( addr u -- char addr' u' )
229: :noname over c@ -rot 1 /string ; IS char@
230:
1.8 crook 231: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 232: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
233: \G display code representing the first character of @i{ccc}.
1.87 pazsan 234: parse-name char@ 2drop ;
1.1 pazsan 235:
1.8 crook 236: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 237: \G Compilation: skip leading spaces. Parse the string
1.15 crook 238: \G @i{ccc}. Run-time: return @i{c}, the display code
239: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 240: \G semantics for this word are undefined.
1.1 pazsan 241: char postpone Literal ; immediate restrict
242:
243: \ \ threading 17mar93py
244:
245: : cfa, ( code-address -- ) \ gforth cfa-comma
246: here
247: dup lastcfa !
1.84 pazsan 248: [ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
249: code-address! ;
1.1 pazsan 250:
1.14 jwilke 251: [IFUNDEF] compile,
1.34 anton 252: defer compile, ( xt -- ) \ core-ext compile-comma
253: \G Compile the word represented by the execution token @i{xt}
254: \G into the current definition.
255:
256: ' , is compile,
1.14 jwilke 257: [THEN]
1.1 pazsan 258:
1.80 pazsan 259: has? ec 0= [IF]
1.40 anton 260: defer basic-block-end ( -- )
261:
1.60 anton 262: :noname ( -- )
263: 0 compile-prim1 ;
264: is basic-block-end
1.80 pazsan 265: [THEN]
1.40 anton 266:
1.99 pazsan 267: has? primcentric [IF]
268: has? peephole [IF]
269: \ dynamic only
270: : peephole-compile, ( xt -- )
271: \ compile xt, appending its code to the current dynamic superinstruction
272: here swap , compile-prim1 ;
273: [ELSE]
274: : peephole-compile, ( xt -- addr ) @ , ;
275: [THEN]
1.40 anton 276:
1.35 anton 277: : compile-to-prims, ( xt -- )
278: \G compile xt to use primitives (and their peephole optimization)
279: \G instead of ","-ing the xt.
280: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 281: dup >does-code if
1.66 anton 282: ['] does-exec peephole-compile, , EXIT
283: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 284: then
285: dup >code-address CASE
1.91 pazsan 286: dovalue: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
287: docon: OF >body @ ['] lit peephole-compile, , EXIT ENDOF
1.66 anton 288: \ docon: OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42 anton 289: \ docon is also used by VALUEs, so don't @ at compile time
1.66 anton 290: docol: OF >body ['] call peephole-compile, , EXIT ENDOF
291: dovar: OF >body ['] lit peephole-compile, , EXIT ENDOF
292: douser: OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
293: dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
294: dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
1.103 anton 295: \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.100 dvdkhlng 296: doabicode: OF >body ['] abi-call peephole-compile, , EXIT ENDOF
1.103 anton 297: do;abicode: OF ['] ;abi-code-exec peephole-compile, , EXIT ENDOF
1.104 anton 298: \ code words and ;code-defined words (code words could be
299: \ optimized, if we could identify them):
1.105 anton 300: dup in-dictionary? IF ( xt code-address )
301: over >body = if ( xt )
302: \ definitely a CODE word
303: peephole-compile, EXIT THEN
304: \ not sure, might be a ;CODE word
305: ['] lit-execute peephole-compile, , EXIT
1.104 anton 306: \ drop POSTPONE literal ['] execute peephole-compile, EXIT
307: THEN
1.35 anton 308: ENDCASE
1.49 anton 309: peephole-compile, ;
1.35 anton 310:
311: ' compile-to-prims, IS compile,
1.36 pazsan 312: [ELSE]
313: ' , is compile,
314: [THEN]
1.34 anton 315:
1.1 pazsan 316: : !does ( addr -- ) \ gforth store-does
1.56 anton 317: latestxt does-code! ;
1.1 pazsan 318:
1.102 pazsan 319: \ : (does>) ( R: addr -- )
320: \ r> cfaligned /does-handler + !does ; \ !! no gforth-native
321:
322: \ \ !! unused, but ifdefed/gosted in some places
323: \ : (does>2) ( addr -- )
324: \ cfaligned /does-handler + !does ;
1.64 anton 325:
1.61 pazsan 326: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63 anton 327: true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1 pazsan 328:
329: \ \ ticks
330:
1.90 anton 331: : name>comp ( nt -- w xt ) \ gforth name-to-comp
1.15 crook 332: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 333: (name>comp)
334: 1 = if
335: ['] execute
336: else
337: ['] compile,
338: then ;
339:
340: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
341: (') postpone ALiteral ; immediate restrict
342:
343: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 344: \g @i{xt} represents @i{name}'s interpretation
345: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 346: \g interpretation semantics.
347: ' postpone ALiteral ; immediate restrict
348:
1.5 anton 349: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 350: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 351: (') name>comp ;
352:
353: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 354: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 355: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
356:
1.18 jwilke 357: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 358: \g Compile the compilation semantics represented by the
359: \g compilation token @i{w xt}.
1.18 jwilke 360: dup ['] execute =
361: if
362: drop compile,
363: else
1.61 pazsan 364: swap POSTPONE aliteral compile,
1.18 jwilke 365: then ;
366:
1.109 ! pazsan 367: has? recognizer [IF]
! 368: include ./recognizer.fs
! 369: [ELSE]
1.18 jwilke 370: : POSTPONE ( "name" -- ) \ core
371: \g Compiles the compilation semantics of @i{name}.
1.48 anton 372: COMP' postpone, ; immediate
1.109 ! pazsan 373: [THEN]
1.18 jwilke 374:
1.1 pazsan 375: \ \ recurse 17may93jaw
376:
377: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 378: \g Call the current definition.
1.56 anton 379: latestxt compile, ; immediate restrict
1.1 pazsan 380:
381: \ \ compiler loop
382:
1.109 ! pazsan 383: has? recognizer 0= [IF]
1.72 anton 384: : compiler1 ( c-addr u -- ... xt )
1.99 pazsan 385: 2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
1.1 pazsan 386: if ( c-addr u nt )
1.72 anton 387: nip nip name>comp
1.1 pazsan 388: else
389: drop
1.72 anton 390: 2dup 2>r snumber? dup
1.1 pazsan 391: IF
392: 0>
393: IF
1.72 anton 394: ['] 2literal
395: ELSE
396: ['] literal
1.1 pazsan 397: THEN
1.72 anton 398: 2rdrop
1.1 pazsan 399: ELSE
1.72 anton 400: drop 2r> compiler-notfound1
1.1 pazsan 401: THEN
402: then ;
403:
1.22 crook 404: : [ ( -- ) \ core left-bracket
1.8 crook 405: \G Enter interpretation state. Immediate word.
1.72 anton 406: ['] interpreter1 IS parser1 state off ; immediate
1.1 pazsan 407:
408: : ] ( -- ) \ core right-bracket
1.8 crook 409: \G Enter compilation state.
1.72 anton 410: ['] compiler1 IS parser1 state on ;
1.109 ! pazsan 411: [THEN]
1.1 pazsan 412:
413: \ \ Strings 22feb93py
414:
1.44 anton 415: : S, ( addr u -- )
1.45 anton 416: \ allot string as counted string
1.84 pazsan 417: [ has? flash [IF] ]
418: dup c, bounds ?DO I c@ c, LOOP
419: [ [ELSE] ]
420: here over char+ allot place align
421: [ [THEN] ] ;
1.45 anton 422:
423: : mem, ( addr u -- )
424: \ allot the memory block HERE (do alignment yourself)
1.84 pazsan 425: [ has? flash [IF] ]
426: bounds ?DO I c@ c, LOOP
427: [ [ELSE] ]
428: here over allot swap move
429: [ [THEN] ] ;
1.1 pazsan 430:
1.44 anton 431: : ," ( "string"<"> -- )
432: [char] " parse s, ;
1.1 pazsan 433:
434: \ \ Header states 23feb93py
435:
1.83 pazsan 436: \ problematic only for big endian machines
437:
438: has? f83headerstring [IF]
439: : cset ( bmask c-addr -- )
440: tuck c@ or swap c! ;
441:
442: : creset ( bmask c-addr -- )
443: tuck c@ swap invert and swap c! ;
444:
445: : ctoggle ( bmask c-addr -- )
446: tuck c@ xor swap c! ;
447: [ELSE]
1.1 pazsan 448: : cset ( bmask c-addr -- )
1.30 anton 449: tuck @ or swap ! ;
1.1 pazsan 450:
451: : creset ( bmask c-addr -- )
1.30 anton 452: tuck @ swap invert and swap ! ;
1.1 pazsan 453:
454: : ctoggle ( bmask c-addr -- )
1.30 anton 455: tuck @ xor swap ! ;
1.83 pazsan 456: [THEN]
1.1 pazsan 457:
458: : lastflags ( -- c-addr )
459: \ the address of the flags byte in the last header
460: \ aborts if the last defined word was headerless
1.56 anton 461: latest dup 0= abort" last word was headerless" cell+ ;
1.1 pazsan 462:
463: : immediate ( -- ) \ core
1.10 crook 464: \G Make the compilation semantics of a word be to @code{execute}
465: \G the execution semantics.
1.83 pazsan 466: immediate-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.1 pazsan 467:
468: : restrict ( -- ) \ gforth
1.10 crook 469: \G A synonym for @code{compile-only}
1.83 pazsan 470: restrict-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.18 jwilke 471:
1.1 pazsan 472: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 473: \G Remove the interpretation semantics of a word.
1.1 pazsan 474:
475: \ \ Create Variable User Constant 17mar93py
476:
1.15 crook 477: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 478: Header reveal
479: alias-mask lastflags creset
480: dup A, lastcfa ! ;
481:
482: doer? :dovar [IF]
483:
484: : Create ( "name" -- ) \ core
485: Header reveal dovar: cfa, ;
486: [ELSE]
487:
488: : Create ( "name" -- ) \ core
489: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
490: [THEN]
491:
1.108 pazsan 492: : buffer: ( u "name" -- ) \ core ext
493: Create allot ;
494:
1.85 pazsan 495: has? flash [IF]
1.87 pazsan 496: : (variable) dpp @ normal-dp = IF Create dpp @
1.85 pazsan 497: ELSE normal-dp @ Constant dpp @ ram THEN ;
498: : Variable ( "name" -- ) \ core
499: (Variable) 0 , dpp ! ;
500:
501: : AVariable ( "name" -- ) \ gforth
502: (Variable) 0 A, dpp ! ;
503:
504: : 2Variable ( "name" -- ) \ double two-variable
505: (Variable) 0 , 0 , dpp ! ;
506: [ELSE]
1.1 pazsan 507: : Variable ( "name" -- ) \ core
508: Create 0 , ;
509:
510: : AVariable ( "name" -- ) \ gforth
511: Create 0 A, ;
512:
1.22 crook 513: : 2Variable ( "name" -- ) \ double two-variable
1.85 pazsan 514: Create 0 , 0 , ;
515: [THEN]
1.1 pazsan 516:
1.75 pazsan 517: has? no-userspace 0= [IF]
1.21 crook 518: : uallot ( n -- ) \ gforth
519: udp @ swap udp +! ;
1.1 pazsan 520:
521: doer? :douser [IF]
522:
523: : User ( "name" -- ) \ gforth
524: Header reveal douser: cfa, cell uallot , ;
525:
526: : AUser ( "name" -- ) \ gforth
527: User ;
528: [ELSE]
529:
530: : User Create cell uallot , DOES> @ up @ + ;
531:
532: : AUser User ;
1.75 pazsan 533: [THEN]
1.1 pazsan 534: [THEN]
535:
536: doer? :docon [IF]
537: : (Constant) Header reveal docon: cfa, ;
538: [ELSE]
539: : (Constant) Create DOES> @ ;
540: [THEN]
541:
1.76 pazsan 542: doer? :dovalue [IF]
543: : (Value) Header reveal dovalue: cfa, ;
544: [ELSE]
545: has? rom [IF]
546: : (Value) Create DOES> @ @ ;
547: [ELSE]
548: : (Value) Create DOES> @ ;
549: [THEN]
550: [THEN]
551:
1.1 pazsan 552: : Constant ( w "name" -- ) \ core
1.15 crook 553: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 554: \G
1.15 crook 555: \G @i{name} execution: @i{-- w}
1.1 pazsan 556: (Constant) , ;
557:
558: : AConstant ( addr "name" -- ) \ gforth
559: (Constant) A, ;
560:
1.84 pazsan 561: has? flash [IF]
562: : Value ( w "name" -- ) \ core-ext
563: (Value) dpp @ >r here cell allot >r
564: ram here >r , r> r> flash! r> dpp ! ;
565:
566: ' Value alias AValue
567: [ELSE]
1.1 pazsan 568: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 569: (Value) , ;
1.1 pazsan 570:
1.37 jwilke 571: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 572: (Value) A, ;
1.84 pazsan 573: [THEN]
1.37 jwilke 574:
1.22 crook 575: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 576: Create ( w1 w2 "name" -- )
577: 2,
578: DOES> ( -- w1 w2 )
579: 2@ ;
580:
581: doer? :dofield [IF]
582: : (Field) Header reveal dofield: cfa, ;
583: [ELSE]
584: : (Field) Create DOES> @ + ;
585: [THEN]
1.39 pazsan 586:
587: \ \ interpret/compile:
588:
589: struct
590: >body
591: cell% field interpret/compile-int
592: cell% field interpret/compile-comp
593: end-struct interpret/compile-struct
594:
595: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
596: Create immediate swap A, A,
597: DOES>
598: abort" executed primary cfa of an interpret/compile: word" ;
599: \ state @ IF cell+ THEN perform ;
600:
1.1 pazsan 601: \ IS Defer What's Defers TO 24feb93py
602:
1.68 anton 603: defer defer-default ( -- )
1.69 anton 604: ' abort is defer-default
605: \ default action for deferred words (overridden by a warning later)
1.67 anton 606:
1.1 pazsan 607: doer? :dodefer [IF]
608:
609: : Defer ( "name" -- ) \ gforth
1.67 anton 610: \G Define a deferred word @i{name}; its execution semantics can be
611: \G set with @code{defer!} or @code{is} (and they have to, before first
612: \G executing @i{name}.
1.1 pazsan 613: Header Reveal dodefer: cfa,
1.86 pazsan 614: [ has? rom [IF] ] here >r cell allot
615: dpp @ ram here r> flash! ['] defer-default A, dpp !
616: [ [ELSE] ] ['] defer-default A, [ [THEN] ] ;
1.18 jwilke 617:
1.1 pazsan 618: [ELSE]
619:
1.77 pazsan 620: has? rom [IF]
621: : Defer ( "name" -- ) \ gforth
1.86 pazsan 622: Create here >r cell allot
623: dpp @ ram here r> flash! ['] defer-default A, dpp !
1.77 pazsan 624: DOES> @ @ execute ;
625: [ELSE]
626: : Defer ( "name" -- ) \ gforth
627: Create ['] defer-default A,
628: DOES> @ execute ;
629: [THEN]
1.1 pazsan 630: [THEN]
631:
1.67 anton 632: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
633: \G @i{xt} represents the word currently associated with the deferred
634: \G word @i{xt-deferred}.
1.86 pazsan 635: >body @ [ has? rom [IF] ] @ [ [THEN] ] ;
1.67 anton 636:
1.25 anton 637: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
638: \G Compiles the present contents of the deferred word @i{name}
639: \G into the current definition. I.e., this produces static
640: \G binding as if @i{name} was not deferred.
1.67 anton 641: ' defer@ compile, ; immediate
1.18 jwilke 642:
1.103 anton 643: : does>-like ( xt -- )
644: \ xt ( addr -- ) is !does or !;abi-code etc, addr is the address
645: \ that should be stored right after the code address.
646: >r ;-hook ?struc
647: [ has? xconds [IF] ] exit-like [ [THEN] ]
648: here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
649: postpone aliteral r> compile, [compile] exit
650: [ has? peephole [IF] ] finish-code [ [THEN] ]
651: defstart ;
652:
1.18 jwilke 653: :noname
1.101 anton 654: here !does ]
1.18 jwilke 655: defstart :-hook ;
656: :noname
1.103 anton 657: ['] !does does>-like :-hook ;
1.18 jwilke 658: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
659:
1.73 anton 660: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 661: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
1.86 pazsan 662: >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
1.67 anton 663:
1.20 anton 664: : <IS> ( "name" xt -- ) \ gforth
665: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 666: ' defer! ;
1.20 anton 667:
668: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
669: \g At run-time, changes the @code{defer}red word @var{name} to
670: \g execute @var{xt}.
1.67 anton 671: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 672:
1.20 anton 673: ' <IS>
1.18 jwilke 674: ' [IS]
1.67 anton 675: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
676: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
677: \G Its compilation semantics parses at compile time.
1.18 jwilke 678:
1.20 anton 679: ' <IS>
680: ' [IS]
681: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 682:
683: : interpret/compile? ( xt -- flag )
684: >does-code ['] DOES> >does-code = ;
1.1 pazsan 685:
686: \ \ : ; 24feb93py
687:
688: defer :-hook ( sys1 -- sys2 )
689:
690: defer ;-hook ( sys2 -- sys1 )
691:
1.16 jwilke 692: 0 Constant defstart
693:
1.14 jwilke 694: [IFDEF] docol,
695: : (:noname) ( -- colon-sys )
696: \ common factor of : and :noname
1.34 anton 697: docol, ]comp
1.14 jwilke 698: [ELSE]
1.7 anton 699: : (:noname) ( -- colon-sys )
700: \ common factor of : and :noname
1.34 anton 701: docol: cfa,
1.14 jwilke 702: [THEN]
1.40 anton 703: defstart ] :-hook ;
1.7 anton 704:
1.1 pazsan 705: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 706: Header (:noname) ;
707:
708: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
709: 0 last !
710: cfalign here (:noname) ;
1.1 pazsan 711:
1.14 jwilke 712: [IFDEF] fini,
713: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
714: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
715: [ELSE]
1.1 pazsan 716: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 717: ;-hook ?struc [compile] exit
718: [ has? peephole [IF] ] finish-code [ [THEN] ]
719: reveal postpone [ ; immediate restrict
1.14 jwilke 720: [THEN]
1.1 pazsan 721:
722: \ \ Search list handling: reveal words, recursive 23feb93py
723:
724: : last? ( -- false / nfa nfa )
1.56 anton 725: latest ?dup ;
1.1 pazsan 726:
1.83 pazsan 727: Variable warnings ( -- addr ) \ gforth
728: G -1 warnings T !
729:
730: has? ec [IF]
731: : reveal ( -- ) \ gforth
732: last?
733: if \ the last word has a header
734: dup ( name>link ) @ -1 =
735: if \ it is still hidden
1.88 pazsan 736: forth-wordlist dup >r @ over
1.84 pazsan 737: [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] r> !
1.83 pazsan 738: else
739: drop
740: then
741: then ;
742: [ELSE]
1.1 pazsan 743: : (reveal) ( nt wid -- )
1.3 pazsan 744: wordlist-id dup >r
1.1 pazsan 745: @ over ( name>link ) !
746: r> ! ;
747:
748: \ make entry in wordlist-map
749: ' (reveal) f83search reveal-method !
750:
751: : check-shadow ( addr count wid -- )
1.2 pazsan 752: \G prints a warning if the string is already present in the wordlist
753: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
754: >stderr
755: ." redefined " name>string 2dup type
1.43 anton 756: str= 0= if
1.2 pazsan 757: ." with " type
758: else
759: 2drop
760: then
761: space space EXIT
762: then
763: 2drop 2drop ;
1.1 pazsan 764:
765: : reveal ( -- ) \ gforth
766: last?
767: if \ the last word has a header
768: dup ( name>link ) @ 1 and
769: if \ it is still hidden
770: dup ( name>link ) @ 1 xor ( nt wid )
771: 2dup >r name>string r> check-shadow ( nt wid )
1.83 pazsan 772: dup wordlist-map @ reveal-method perform
1.1 pazsan 773: else
774: drop
775: then
776: then ;
777:
778: : rehash ( wid -- )
779: dup wordlist-map @ rehash-method perform ;
1.80 pazsan 780: [THEN]
1.1 pazsan 781:
782: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 783: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 784: \g recursively.
785: immediate restrict
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