Annotation of gforth/kernel/comp.fs, revision 1.84
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.
1.84 ! pazsan 51: here 1 chars allot [ has? flash [IF] ] flashc! [ [ELSE] ] c! [ [THEN] ] ;
1.1 pazsan 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.
1.84 ! pazsan 55: here cell allot [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] ;
1.1 pazsan 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).
1.84 ! pazsan 60: here 2 cells allot [ has? flash [IF] ] tuck flash! cell+ flash!
! 61: [ [ELSE] ] 2! [ [THEN] ] ;
1.1 pazsan 62:
63: \ : aligned ( addr -- addr' ) \ core
64: \ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
65:
66: : align ( -- ) \ core
1.15 crook 67: \G If the data-space pointer is not aligned, reserve enough space to align it.
1.1 pazsan 68: here dup aligned swap ?DO bl c, LOOP ;
69:
1.22 crook 70: \ : faligned ( addr -- f-addr ) \ float f-aligned
1.1 pazsan 71: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
72:
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 ;
80:
1.9 anton 81: : maxalign ( -- ) \ gforth
1.23 anton 82: \G Align data-space pointer for all alignment requirements.
1.1 pazsan 83: here dup maxaligned swap
84: ?DO
85: bl c,
86: LOOP ;
87:
88: \ the code field is aligned if its body is maxaligned
89: ' maxalign Alias cfalign ( -- ) \ gforth
1.24 anton 90: \G Align data-space pointer for code field requirements (i.e., such
91: \G that the corresponding body is maxaligned).
1.1 pazsan 92:
93: ' , alias A, ( addr -- ) \ gforth
94:
95: ' NOOP ALIAS const
96:
97: \ \ Header 23feb93py
98:
99: \ input-stream, nextname and noname are quite ugly (passing
100: \ information through global variables), but they are useful for dealing
101: \ with existing/independent defining words
102:
103: defer (header)
104: defer header ( -- ) \ gforth
105: ' (header) IS header
106:
107: : string, ( c-addr u -- ) \ gforth
108: \G puts down string as cstring
1.83 pazsan 109: dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
1.84 ! pazsan 110: [ has? flash [IF] ]
! 111: bounds ?DO I c@ c, LOOP
! 112: [ [ELSE] ]
! 113: here swap chars dup allot move
! 114: [ [THEN] ] ;
1.1 pazsan 115:
1.30 anton 116: : longstring, ( c-addr u -- ) \ gforth
1.55 anton 117: \G puts down string as longcstring
1.30 anton 118: dup , here swap chars dup allot move ;
119:
1.1 pazsan 120: : header, ( c-addr u -- ) \ gforth
121: name-too-long?
1.53 anton 122: dup max-name-length @ max max-name-length !
1.1 pazsan 123: align here last !
1.84 ! pazsan 124: [ has? flash [IF] ]
1.83 pazsan 125: -1 A,
126: [ [ELSE] ]
1.1 pazsan 127: current @ 1 or A, \ link field; before revealing, it contains the
128: \ tagged reveal-into wordlist
1.83 pazsan 129: [ [THEN] ]
1.78 pazsan 130: [ has? f83headerstring [IF] ]
131: string,
132: [ [ELSE] ]
1.83 pazsan 133: longstring, alias-mask lastflags cset
1.78 pazsan 134: [ [THEN] ]
1.83 pazsan 135: cfalign ;
1.1 pazsan 136:
137: : input-stream-header ( "name" -- )
1.80 pazsan 138: parse-name name-too-short? header, ;
1.1 pazsan 139:
140: : input-stream ( -- ) \ general
141: \G switches back to getting the name from the input stream ;
142: ['] input-stream-header IS (header) ;
143:
144: ' input-stream-header IS (header)
145:
1.32 anton 146: 2variable nextname-string
1.1 pazsan 147:
1.33 pazsan 148: has? OS [IF]
1.1 pazsan 149: : nextname-header ( -- )
1.32 anton 150: nextname-string 2@ header,
151: nextname-string free-mem-var
1.1 pazsan 152: input-stream ;
1.33 pazsan 153: [THEN]
1.1 pazsan 154:
155: \ the next name is given in the string
156:
1.33 pazsan 157: has? OS [IF]
1.1 pazsan 158: : nextname ( c-addr u -- ) \ gforth
1.19 anton 159: \g The next defined word will have the name @var{c-addr u}; the
160: \g defining word will leave the input stream alone.
1.1 pazsan 161: name-too-long?
1.32 anton 162: nextname-string free-mem-var
163: save-mem nextname-string 2!
1.1 pazsan 164: ['] nextname-header IS (header) ;
1.33 pazsan 165: [THEN]
1.1 pazsan 166:
167: : noname-header ( -- )
168: 0 last ! cfalign
169: input-stream ;
170:
171: : noname ( -- ) \ gforth
1.19 anton 172: \g The next defined word will be anonymous. The defining word will
173: \g leave the input stream alone. The xt of the defined word will
1.56 anton 174: \g be given by @code{latestxt}.
1.1 pazsan 175: ['] noname-header IS (header) ;
176:
1.56 anton 177: : latestxt ( -- xt ) \ gforth
1.15 crook 178: \G @i{xt} is the execution token of the last word defined.
1.13 crook 179: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 180: lastcfa @ ;
181:
1.56 anton 182: ' latestxt alias lastxt \ gforth-obsolete
183: \G old name for @code{latestxt}.
184:
185: : latest ( -- nt ) \ gforth
186: \G @var{nt} is the name token of the last word defined; it is 0 if the
187: \G last word has no name.
188: last @ ;
189:
1.1 pazsan 190: \ \ literals 17dec92py
191:
192: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 193: \G Compilation semantics: compile the run-time semantics.@*
194: \G Run-time Semantics: push @i{n}.@*
195: \G Interpretation semantics: undefined.
1.14 jwilke 196: [ [IFDEF] lit, ]
197: lit,
198: [ [ELSE] ]
1.27 anton 199: postpone lit ,
1.14 jwilke 200: [ [THEN] ] ; immediate restrict
1.1 pazsan 201:
1.72 anton 202: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
203: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
204: \G placed on the stack. Interpretation semantics are undefined.
205: swap postpone Literal postpone Literal ; immediate restrict
206:
1.1 pazsan 207: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 208: [ [IFDEF] alit, ]
209: alit,
210: [ [ELSE] ]
211: postpone lit A,
212: [ [THEN] ] ; immediate restrict
1.1 pazsan 213:
1.70 pazsan 214: Defer char@ ( addr u -- char addr' u' )
215: :noname over c@ -rot 1 /string ; IS char@
216:
1.8 crook 217: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 218: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
219: \G display code representing the first character of @i{ccc}.
1.70 pazsan 220: bl word count char@ 2drop ;
1.1 pazsan 221:
1.8 crook 222: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 223: \G Compilation: skip leading spaces. Parse the string
1.15 crook 224: \G @i{ccc}. Run-time: return @i{c}, the display code
225: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 226: \G semantics for this word are undefined.
1.1 pazsan 227: char postpone Literal ; immediate restrict
228:
229: \ \ threading 17mar93py
230:
231: : cfa, ( code-address -- ) \ gforth cfa-comma
232: here
233: dup lastcfa !
1.84 ! pazsan 234: [ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
! 235: code-address! ;
1.1 pazsan 236:
1.14 jwilke 237: [IFUNDEF] compile,
1.34 anton 238: defer compile, ( xt -- ) \ core-ext compile-comma
239: \G Compile the word represented by the execution token @i{xt}
240: \G into the current definition.
241:
242: ' , is compile,
1.14 jwilke 243: [THEN]
1.1 pazsan 244:
1.80 pazsan 245: has? ec 0= [IF]
1.40 anton 246: defer basic-block-end ( -- )
247:
1.60 anton 248: :noname ( -- )
249: 0 compile-prim1 ;
250: is basic-block-end
1.80 pazsan 251: [THEN]
1.40 anton 252:
1.36 pazsan 253: has? peephole [IF]
1.40 anton 254:
255: \ dynamic only
1.49 anton 256: : peephole-compile, ( xt -- )
257: \ compile xt, appending its code to the current dynamic superinstruction
258: here swap , compile-prim1 ;
1.38 anton 259:
1.35 anton 260: : compile-to-prims, ( xt -- )
261: \G compile xt to use primitives (and their peephole optimization)
262: \G instead of ","-ing the xt.
263: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 264: dup >does-code if
1.66 anton 265: ['] does-exec peephole-compile, , EXIT
266: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 267: then
268: dup >code-address CASE
1.66 anton 269: docon: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
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:
306: : name>comp ( nt -- w xt ) \ gforth
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:
461: : Variable ( "name" -- ) \ core
462: Create 0 , ;
463:
464: : AVariable ( "name" -- ) \ gforth
465: Create 0 A, ;
466:
1.22 crook 467: : 2Variable ( "name" -- ) \ double two-variable
1.1 pazsan 468: create 0 , 0 , ;
469:
1.75 pazsan 470: has? no-userspace 0= [IF]
1.21 crook 471: : uallot ( n -- ) \ gforth
472: udp @ swap udp +! ;
1.1 pazsan 473:
474: doer? :douser [IF]
475:
476: : User ( "name" -- ) \ gforth
477: Header reveal douser: cfa, cell uallot , ;
478:
479: : AUser ( "name" -- ) \ gforth
480: User ;
481: [ELSE]
482:
483: : User Create cell uallot , DOES> @ up @ + ;
484:
485: : AUser User ;
1.75 pazsan 486: [THEN]
1.1 pazsan 487: [THEN]
488:
489: doer? :docon [IF]
490: : (Constant) Header reveal docon: cfa, ;
491: [ELSE]
492: : (Constant) Create DOES> @ ;
493: [THEN]
494:
1.76 pazsan 495: doer? :dovalue [IF]
496: : (Value) Header reveal dovalue: cfa, ;
497: [ELSE]
498: has? rom [IF]
499: : (Value) Create DOES> @ @ ;
500: [ELSE]
501: : (Value) Create DOES> @ ;
502: [THEN]
503: [THEN]
504:
1.1 pazsan 505: : Constant ( w "name" -- ) \ core
1.15 crook 506: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 507: \G
1.15 crook 508: \G @i{name} execution: @i{-- w}
1.1 pazsan 509: (Constant) , ;
510:
511: : AConstant ( addr "name" -- ) \ gforth
512: (Constant) A, ;
513:
1.84 ! pazsan 514: has? flash [IF]
! 515: : Value ( w "name" -- ) \ core-ext
! 516: (Value) dpp @ >r here cell allot >r
! 517: ram here >r , r> r> flash! r> dpp ! ;
! 518:
! 519: ' Value alias AValue
! 520: [ELSE]
1.1 pazsan 521: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 522: (Value) , ;
1.1 pazsan 523:
1.37 jwilke 524: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 525: (Value) A, ;
1.84 ! pazsan 526: [THEN]
1.37 jwilke 527:
1.22 crook 528: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 529: Create ( w1 w2 "name" -- )
530: 2,
531: DOES> ( -- w1 w2 )
532: 2@ ;
533:
534: doer? :dofield [IF]
535: : (Field) Header reveal dofield: cfa, ;
536: [ELSE]
537: : (Field) Create DOES> @ + ;
538: [THEN]
1.39 pazsan 539:
540: \ \ interpret/compile:
541:
542: struct
543: >body
544: cell% field interpret/compile-int
545: cell% field interpret/compile-comp
546: end-struct interpret/compile-struct
547:
548: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
549: Create immediate swap A, A,
550: DOES>
551: abort" executed primary cfa of an interpret/compile: word" ;
552: \ state @ IF cell+ THEN perform ;
553:
1.1 pazsan 554: \ IS Defer What's Defers TO 24feb93py
555:
1.68 anton 556: defer defer-default ( -- )
1.69 anton 557: ' abort is defer-default
558: \ default action for deferred words (overridden by a warning later)
1.67 anton 559:
1.1 pazsan 560: doer? :dodefer [IF]
561:
562: : Defer ( "name" -- ) \ gforth
1.67 anton 563: \G Define a deferred word @i{name}; its execution semantics can be
564: \G set with @code{defer!} or @code{is} (and they have to, before first
565: \G executing @i{name}.
1.1 pazsan 566: Header Reveal dodefer: cfa,
1.67 anton 567: ['] defer-default A, ;
1.18 jwilke 568:
1.1 pazsan 569: [ELSE]
570:
1.77 pazsan 571: has? rom [IF]
572: : Defer ( "name" -- ) \ gforth
573: Create ['] defer-default A,
574: DOES> @ @ execute ;
575: [ELSE]
576: : Defer ( "name" -- ) \ gforth
577: Create ['] defer-default A,
578: DOES> @ execute ;
579: [THEN]
1.1 pazsan 580: [THEN]
581:
1.67 anton 582: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
583: \G @i{xt} represents the word currently associated with the deferred
584: \G word @i{xt-deferred}.
585: >body @ ;
586:
1.25 anton 587: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
588: \G Compiles the present contents of the deferred word @i{name}
589: \G into the current definition. I.e., this produces static
590: \G binding as if @i{name} was not deferred.
1.67 anton 591: ' defer@ compile, ; immediate
1.18 jwilke 592:
593: :noname
594: dodoes, here !does ]
595: defstart :-hook ;
596: :noname
597: ;-hook ?struc
598: [ has? xconds [IF] ] exit-like [ [THEN] ]
1.84 ! pazsan 599: here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
! 600: postpone aliteral postpone (does>2) [compile] exit
1.80 pazsan 601: [ has? peephole [IF] ] finish-code [ [THEN] ] dodoes,
1.18 jwilke 602: defstart :-hook ;
603: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
604:
1.73 anton 605: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 606: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
607: >body ! ;
608:
1.20 anton 609: : <IS> ( "name" xt -- ) \ gforth
610: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 611: ' defer! ;
1.20 anton 612:
613: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
614: \g At run-time, changes the @code{defer}red word @var{name} to
615: \g execute @var{xt}.
1.67 anton 616: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 617:
1.20 anton 618: ' <IS>
1.18 jwilke 619: ' [IS]
1.67 anton 620: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
621: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
622: \G Its compilation semantics parses at compile time.
1.18 jwilke 623:
1.20 anton 624: ' <IS>
625: ' [IS]
626: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 627:
628: : interpret/compile? ( xt -- flag )
629: >does-code ['] DOES> >does-code = ;
1.1 pazsan 630:
631: \ \ : ; 24feb93py
632:
633: defer :-hook ( sys1 -- sys2 )
634:
635: defer ;-hook ( sys2 -- sys1 )
636:
1.16 jwilke 637: 0 Constant defstart
638:
1.14 jwilke 639: [IFDEF] docol,
640: : (:noname) ( -- colon-sys )
641: \ common factor of : and :noname
1.34 anton 642: docol, ]comp
1.14 jwilke 643: [ELSE]
1.7 anton 644: : (:noname) ( -- colon-sys )
645: \ common factor of : and :noname
1.34 anton 646: docol: cfa,
1.14 jwilke 647: [THEN]
1.40 anton 648: defstart ] :-hook ;
1.7 anton 649:
1.1 pazsan 650: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 651: Header (:noname) ;
652:
653: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
654: 0 last !
655: cfalign here (:noname) ;
1.1 pazsan 656:
1.14 jwilke 657: [IFDEF] fini,
658: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
659: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
660: [ELSE]
1.1 pazsan 661: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 662: ;-hook ?struc [compile] exit
663: [ has? peephole [IF] ] finish-code [ [THEN] ]
664: reveal postpone [ ; immediate restrict
1.14 jwilke 665: [THEN]
1.1 pazsan 666:
667: \ \ Search list handling: reveal words, recursive 23feb93py
668:
669: : last? ( -- false / nfa nfa )
1.56 anton 670: latest ?dup ;
1.1 pazsan 671:
1.83 pazsan 672: Variable warnings ( -- addr ) \ gforth
673: G -1 warnings T !
674:
675: has? ec [IF]
676: : reveal ( -- ) \ gforth
677: last?
678: if \ the last word has a header
679: dup ( name>link ) @ -1 =
680: if \ it is still hidden
1.84 ! pazsan 681: current @ dup >r @ over
! 682: [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] r> !
1.83 pazsan 683: else
684: drop
685: then
686: then ;
687: [ELSE]
1.1 pazsan 688: : (reveal) ( nt wid -- )
1.3 pazsan 689: wordlist-id dup >r
1.1 pazsan 690: @ over ( name>link ) !
691: r> ! ;
692:
693: \ make entry in wordlist-map
694: ' (reveal) f83search reveal-method !
695:
696: : check-shadow ( addr count wid -- )
1.2 pazsan 697: \G prints a warning if the string is already present in the wordlist
698: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
699: >stderr
700: ." redefined " name>string 2dup type
1.43 anton 701: str= 0= if
1.2 pazsan 702: ." with " type
703: else
704: 2drop
705: then
706: space space EXIT
707: then
708: 2drop 2drop ;
1.1 pazsan 709:
710: : reveal ( -- ) \ gforth
711: last?
712: if \ the last word has a header
713: dup ( name>link ) @ 1 and
714: if \ it is still hidden
715: dup ( name>link ) @ 1 xor ( nt wid )
716: 2dup >r name>string r> check-shadow ( nt wid )
1.83 pazsan 717: dup wordlist-map @ reveal-method perform
1.1 pazsan 718: else
719: drop
720: then
721: then ;
722:
723: : rehash ( wid -- )
724: dup wordlist-map @ rehash-method perform ;
1.80 pazsan 725: [THEN]
1.1 pazsan 726:
727: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 728: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 729: \g recursively.
730: immediate restrict
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