Annotation of gforth/kernel/comp.fs, revision 1.18
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.6 anton 3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation; either version 2
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program; if not, write to the Free Software
19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20:
1.1 pazsan 21: \ \ 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
1.17 anton 38: \G Reserve or release @i{n} address units of data space without
39: \G initialization; @i{n} is a signed number. In ANS Forth you can
40: \G only deallocate memory from the current contiguous region in
41: \G this way. In Gforth you can deallocate anything in this way
42: \G but named words. 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:
48: : c, ( c -- ) \ core
1.15 crook 49: \G Reserve data space for one char and store @i{c} in the space.
1.1 pazsan 50: here 1 chars allot c! ;
51:
1.11 crook 52: : , ( w -- ) \ core
1.15 crook 53: \G Reserve data space for one cell and store @i{w} in the space.
1.1 pazsan 54: here cell allot ! ;
55:
56: : 2, ( w1 w2 -- ) \ gforth
1.15 crook 57: \G Reserve data space for two cells and store the double @i{w1
1.11 crook 58: \G w2} in the space.
1.1 pazsan 59: here 2 cells allot 2! ;
60:
61: \ : aligned ( addr -- addr' ) \ core
62: \ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
63:
64: : align ( -- ) \ core
1.15 crook 65: \G If the data-space pointer is not aligned, reserve enough space to align it.
1.1 pazsan 66: here dup aligned swap ?DO bl c, LOOP ;
67:
68: \ : faligned ( addr -- f-addr ) \ float
69: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
70:
71: : falign ( -- ) \ float
1.15 crook 72: \G If the data-space pointer is not float-aligned, reserve
73: \G enough space to align it.
1.1 pazsan 74: here dup faligned swap
75: ?DO
76: bl c,
77: LOOP ;
78:
1.9 anton 79: : maxalign ( -- ) \ gforth
1.1 pazsan 80: here dup maxaligned swap
81: ?DO
82: bl c,
83: LOOP ;
84:
85: \ the code field is aligned if its body is maxaligned
86: ' maxalign Alias cfalign ( -- ) \ gforth
87:
88: ' , alias A, ( addr -- ) \ gforth
89:
90: ' NOOP ALIAS const
91:
92: \ \ Header 23feb93py
93:
94: \ input-stream, nextname and noname are quite ugly (passing
95: \ information through global variables), but they are useful for dealing
96: \ with existing/independent defining words
97:
98: defer (header)
99: defer header ( -- ) \ gforth
100: ' (header) IS header
101:
102: : string, ( c-addr u -- ) \ gforth
103: \G puts down string as cstring
104: dup c, here swap chars dup allot move ;
105:
106: : header, ( c-addr u -- ) \ gforth
107: name-too-long?
108: align here last !
109: current @ 1 or A, \ link field; before revealing, it contains the
110: \ tagged reveal-into wordlist
111: string, cfalign
112: alias-mask lastflags cset ;
113:
114: : input-stream-header ( "name" -- )
115: name name-too-short? header, ;
116:
117: : input-stream ( -- ) \ general
118: \G switches back to getting the name from the input stream ;
119: ['] input-stream-header IS (header) ;
120:
121: ' input-stream-header IS (header)
122:
123: \ !! make that a 2variable
124: create nextname-buffer 32 chars allot
125:
126: : nextname-header ( -- )
127: nextname-buffer count header,
128: input-stream ;
129:
130: \ the next name is given in the string
131:
132: : nextname ( c-addr u -- ) \ gforth
133: name-too-long?
134: nextname-buffer c! ( c-addr )
135: nextname-buffer count move
136: ['] nextname-header IS (header) ;
137:
138: : noname-header ( -- )
139: 0 last ! cfalign
140: input-stream ;
141:
142: : noname ( -- ) \ gforth
143: \ the next defined word remains anonymous. The xt of that word is given by lastxt
144: ['] noname-header IS (header) ;
145:
146: : lastxt ( -- xt ) \ gforth
1.15 crook 147: \G @i{xt} is the execution token of the last word defined.
1.13 crook 148: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 149: lastcfa @ ;
150:
151: \ \ literals 17dec92py
152:
153: : Literal ( compilation n -- ; run-time -- n ) \ core
1.15 crook 154: \G Compile appropriate code such that, at run-time, @i{n} is placed
1.8 crook 155: \G on the stack. Interpretation semantics are undefined.
1.14 jwilke 156: [ [IFDEF] lit, ]
157: lit,
158: [ [ELSE] ]
159: postpone lit ,
160: [ [THEN] ] ; immediate restrict
1.1 pazsan 161:
162: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 163: [ [IFDEF] alit, ]
164: alit,
165: [ [ELSE] ]
166: postpone lit A,
167: [ [THEN] ] ; immediate restrict
1.1 pazsan 168:
1.8 crook 169: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 170: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
171: \G display code representing the first character of @i{ccc}.
1.1 pazsan 172: bl word char+ c@ ;
173:
1.8 crook 174: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 175: \G Compilation: skip leading spaces. Parse the string
1.15 crook 176: \G @i{ccc}. Run-time: return @i{c}, the display code
177: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 178: \G semantics for this word are undefined.
1.1 pazsan 179: char postpone Literal ; immediate restrict
180:
181: \ \ threading 17mar93py
182:
183: : cfa, ( code-address -- ) \ gforth cfa-comma
184: here
185: dup lastcfa !
186: 0 A, 0 , code-address! ;
187:
1.14 jwilke 188: [IFUNDEF] compile,
1.1 pazsan 189: : compile, ( xt -- ) \ core-ext compile-comma
1.15 crook 190: \G Compile the word represented by the execution token, @i{xt},
191: \G into the current definition.
1.1 pazsan 192: A, ;
1.14 jwilke 193: [THEN]
1.1 pazsan 194:
195: : !does ( addr -- ) \ gforth store-does
196: lastxt does-code! ;
197:
198: : (does>) ( R: addr -- )
199: r> cfaligned /does-handler + !does ;
200:
201: : dodoes, ( -- )
202: cfalign here /does-handler allot does-handler! ;
203:
204: : (compile) ( -- ) \ gforth
205: r> dup cell+ >r @ compile, ;
206:
207: \ \ ticks
208:
209: : name>comp ( nt -- w xt ) \ gforth
1.15 crook 210: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 211: (name>comp)
212: 1 = if
213: ['] execute
214: else
215: ['] compile,
216: then ;
217:
218: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
219: (') postpone ALiteral ; immediate restrict
220:
221: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 222: \g @i{xt} represents @i{name}'s interpretation
223: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 224: \g interpretation semantics.
225: ' postpone ALiteral ; immediate restrict
226:
1.5 anton 227: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 228: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 229: (') name>comp ;
230:
231: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 232: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 233: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
234:
1.18 ! jwilke 235: : postpone, ( w xt -- ) \ gforth postpone-comma
! 236: \g Compile the compilation semantics represented by @i{w xt}.
! 237: dup ['] execute =
! 238: if
! 239: drop compile,
! 240: else
! 241: dup ['] compile, =
! 242: if
! 243: drop POSTPONE (compile) a,
! 244: else
! 245: swap POSTPONE aliteral compile,
! 246: then
! 247: then ;
! 248:
! 249: : POSTPONE ( "name" -- ) \ core
! 250: \g Compiles the compilation semantics of @i{name}.
! 251: COMP' postpone, ; immediate restrict
! 252:
1.1 pazsan 253: \ \ recurse 17may93jaw
254:
255: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 256: \g Call the current definition.
1.1 pazsan 257: lastxt compile, ; immediate restrict
258:
259: \ \ compiler loop
260:
261: : compiler ( c-addr u -- )
262: 2dup find-name dup
263: if ( c-addr u nt )
264: nip nip name>comp execute
265: else
266: drop
267: 2dup snumber? dup
268: IF
269: 0>
270: IF
271: swap postpone Literal
272: THEN
273: postpone Literal
274: 2drop
275: ELSE
276: drop compiler-notfound
277: THEN
278: then ;
279:
280: : [ ( -- ) \ core left-bracket
1.8 crook 281: \G Enter interpretation state. Immediate word.
1.1 pazsan 282: ['] interpreter IS parser state off ; immediate
283:
284: : ] ( -- ) \ core right-bracket
1.8 crook 285: \G Enter compilation state.
1.1 pazsan 286: ['] compiler IS parser state on ;
287:
288: \ \ Strings 22feb93py
289:
290: : ," ( "string"<"> -- ) [char] " parse
291: here over char+ allot place align ;
292:
293: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
1.15 crook 294: \G Compilation: compile the string specified by @i{c-addr1},
295: \G @i{u} into the current definition. Run-time: return
296: \G @i{c-addr2 u} describing the address and length of the
1.10 crook 297: \G string.
1.1 pazsan 298: postpone (S") here over char+ allot place align ;
299: immediate restrict
300:
301: \ \ abort" 22feb93py
302:
303: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext abort-quote
1.15 crook 304: \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
305: \G displaying the string @i{ccc} if there is no exception frame on the
1.10 crook 306: \G exception stack.
1.1 pazsan 307: postpone (abort") ," ; immediate restrict
308:
309: \ \ Header states 23feb93py
310:
311: : cset ( bmask c-addr -- )
312: tuck c@ or swap c! ;
313:
314: : creset ( bmask c-addr -- )
315: tuck c@ swap invert and swap c! ;
316:
317: : ctoggle ( bmask c-addr -- )
318: tuck c@ xor swap c! ;
319:
320: : lastflags ( -- c-addr )
321: \ the address of the flags byte in the last header
322: \ aborts if the last defined word was headerless
323: last @ dup 0= abort" last word was headerless" cell+ ;
324:
325: : immediate ( -- ) \ core
1.10 crook 326: \G Make the compilation semantics of a word be to @code{execute}
327: \G the execution semantics.
1.1 pazsan 328: immediate-mask lastflags cset ;
329:
330: : restrict ( -- ) \ gforth
1.10 crook 331: \G A synonym for @code{compile-only}
1.1 pazsan 332: restrict-mask lastflags cset ;
1.18 ! jwilke 333:
1.1 pazsan 334: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 335: \G Remove the interpretation semantics of a word.
1.1 pazsan 336:
337: \ \ Create Variable User Constant 17mar93py
338:
1.15 crook 339: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 340: Header reveal
341: alias-mask lastflags creset
342: dup A, lastcfa ! ;
343:
344: doer? :dovar [IF]
345:
346: : Create ( "name" -- ) \ core
347: Header reveal dovar: cfa, ;
348: [ELSE]
349:
350: : Create ( "name" -- ) \ core
351: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
352: [THEN]
353:
354: : Variable ( "name" -- ) \ core
355: Create 0 , ;
356:
357: : AVariable ( "name" -- ) \ gforth
358: Create 0 A, ;
359:
360: : 2Variable ( "name" -- ) \ double
361: create 0 , 0 , ;
362:
363: : uallot ( n -- ) udp @ swap udp +! ;
364:
365: doer? :douser [IF]
366:
367: : User ( "name" -- ) \ gforth
368: Header reveal douser: cfa, cell uallot , ;
369:
370: : AUser ( "name" -- ) \ gforth
371: User ;
372: [ELSE]
373:
374: : User Create cell uallot , DOES> @ up @ + ;
375:
376: : AUser User ;
377: [THEN]
378:
379: doer? :docon [IF]
380: : (Constant) Header reveal docon: cfa, ;
381: [ELSE]
382: : (Constant) Create DOES> @ ;
383: [THEN]
384:
385: : Constant ( w "name" -- ) \ core
1.15 crook 386: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 387: \G
1.15 crook 388: \G @i{name} execution: @i{-- w}
1.1 pazsan 389: (Constant) , ;
390:
391: : AConstant ( addr "name" -- ) \ gforth
392: (Constant) A, ;
393:
394: : Value ( w "name" -- ) \ core-ext
395: (Constant) , ;
396:
397: : 2Constant ( w1 w2 "name" -- ) \ double
398: Create ( w1 w2 "name" -- )
399: 2,
400: DOES> ( -- w1 w2 )
401: 2@ ;
402:
403: doer? :dofield [IF]
404: : (Field) Header reveal dofield: cfa, ;
405: [ELSE]
406: : (Field) Create DOES> @ + ;
407: [THEN]
408: \ IS Defer What's Defers TO 24feb93py
409:
410: doer? :dodefer [IF]
411:
412: : Defer ( "name" -- ) \ gforth
413: \ !! shouldn't it be initialized with abort or something similar?
414: Header Reveal dodefer: cfa,
415: ['] noop A, ;
1.18 ! jwilke 416:
1.1 pazsan 417: [ELSE]
418:
419: : Defer ( "name" -- ) \ gforth
420: Create ['] noop A,
421: DOES> @ execute ;
1.18 ! jwilke 422:
1.1 pazsan 423: [THEN]
424:
425: : Defers ( "name" -- ) \ gforth
426: ' >body @ compile, ; immediate
1.18 ! jwilke 427:
! 428: :noname
! 429: dodoes, here !does ]
! 430: defstart :-hook ;
! 431: :noname
! 432: ;-hook ?struc
! 433: [ has? xconds [IF] ] exit-like [ [THEN] ]
! 434: postpone (does>) dodoes,
! 435: defstart :-hook ;
! 436: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
! 437:
! 438: : [IS] ( compilation "name" -- ; run-time xt -- ) \ possibly-gforth bracket-is
! 439: ' >body postpone ALiteral postpone ! ; immediate restrict
! 440:
! 441: :noname ' >body ! ;
! 442: ' [IS]
! 443: interpret/compile: IS ( xt "name" -- ) \ gforth
! 444:
! 445: ' IS Alias TO ( w "name" -- ) \ core-ext
! 446: immediate
! 447:
! 448: :noname ' >body @ ;
! 449: :noname ' >body postpone ALiteral postpone @ ;
! 450: interpret/compile: What's ( "name" -- addr ) \ gforth
! 451:
! 452: \ \ interpret/compile:
! 453:
! 454: struct
! 455: >body
! 456: cell% field interpret/compile-int
! 457: cell% field interpret/compile-comp
! 458: end-struct interpret/compile-struct
! 459:
! 460: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
! 461: Create immediate swap A, A,
! 462: DOES>
! 463: abort" executed primary cfa of an interpret/compile: word" ;
! 464: \ state @ IF cell+ THEN perform ;
! 465:
! 466: : interpret/compile? ( xt -- flag )
! 467: >does-code ['] DOES> >does-code = ;
1.1 pazsan 468:
469: \ \ : ; 24feb93py
470:
471: defer :-hook ( sys1 -- sys2 )
472:
473: defer ;-hook ( sys2 -- sys1 )
474:
1.16 jwilke 475: 0 Constant defstart
476:
1.14 jwilke 477: [IFDEF] docol,
478: : (:noname) ( -- colon-sys )
479: \ common factor of : and :noname
480: docol, ]comp defstart ] :-hook ;
481: [ELSE]
1.7 anton 482: : (:noname) ( -- colon-sys )
483: \ common factor of : and :noname
484: docol: cfa, defstart ] :-hook ;
1.14 jwilke 485: [THEN]
1.7 anton 486:
1.1 pazsan 487: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 488: Header (:noname) ;
489:
490: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
491: 0 last !
492: cfalign here (:noname) ;
1.1 pazsan 493:
1.14 jwilke 494: [IFDEF] fini,
495: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
496: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
497: [ELSE]
1.1 pazsan 498: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
499: ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1.14 jwilke 500: [THEN]
1.1 pazsan 501:
502: \ \ Search list handling: reveal words, recursive 23feb93py
503:
504: : last? ( -- false / nfa nfa )
505: last @ ?dup ;
506:
507: : (reveal) ( nt wid -- )
1.3 pazsan 508: wordlist-id dup >r
1.1 pazsan 509: @ over ( name>link ) !
510: r> ! ;
511:
512: \ make entry in wordlist-map
513: ' (reveal) f83search reveal-method !
514:
515: Variable warnings ( -- addr ) \ gforth
516: G -1 warnings T !
517:
518: : check-shadow ( addr count wid -- )
1.2 pazsan 519: \G prints a warning if the string is already present in the wordlist
520: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
521: >stderr
522: ." redefined " name>string 2dup type
523: compare 0<> if
524: ." with " type
525: else
526: 2drop
527: then
528: space space EXIT
529: then
530: 2drop 2drop ;
1.1 pazsan 531:
532: : reveal ( -- ) \ gforth
533: last?
534: if \ the last word has a header
535: dup ( name>link ) @ 1 and
536: if \ it is still hidden
537: dup ( name>link ) @ 1 xor ( nt wid )
538: 2dup >r name>string r> check-shadow ( nt wid )
539: dup wordlist-map @ reveal-method perform
540: else
541: drop
542: then
543: then ;
544:
545: : rehash ( wid -- )
546: dup wordlist-map @ rehash-method perform ;
547:
548: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 549: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 550: \g recursively.
551: immediate restrict
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