Annotation of gforth/kernel/comp.fs, revision 1.111
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.
1.110 pazsan 50: here 1 chars allot c! ;
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.
1.110 pazsan 54: here cell allot ! ;
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).
1.110 pazsan 59: here 2 cells allot 2! ;
1.1 pazsan 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:
1.22 crook 68: \ : faligned ( addr -- f-addr ) \ float f-aligned
1.1 pazsan 69: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
70:
1.22 crook 71: : falign ( -- ) \ float f-align
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
1.23 anton 80: \G Align data-space pointer for all alignment requirements.
1.1 pazsan 81: here dup maxaligned swap
82: ?DO
83: bl c,
84: LOOP ;
85:
86: \ the code field is aligned if its body is maxaligned
87: ' maxalign Alias cfalign ( -- ) \ gforth
1.24 anton 88: \G Align data-space pointer for code field requirements (i.e., such
89: \G that the corresponding body is maxaligned).
1.1 pazsan 90:
91: ' , alias A, ( addr -- ) \ gforth
92:
93: ' NOOP ALIAS const
94:
95: \ \ Header 23feb93py
96:
97: \ input-stream, nextname and noname are quite ugly (passing
98: \ information through global variables), but they are useful for dealing
99: \ with existing/independent defining words
100:
101: : string, ( c-addr u -- ) \ gforth
102: \G puts down string as cstring
1.110 pazsan 103: dup alias-mask or c,
104: here swap chars dup allot move ;
1.1 pazsan 105:
1.30 anton 106: : longstring, ( c-addr u -- ) \ gforth
1.55 anton 107: \G puts down string as longcstring
1.30 anton 108: dup , here swap chars dup allot move ;
109:
1.99 pazsan 110: [IFDEF] prelude-mask
1.96 anton 111: variable next-prelude
112:
113: : prelude, ( -- )
114: next-prelude @ if
115: align next-prelude @ ,
116: then ;
1.99 pazsan 117: [THEN]
1.96 anton 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 !
1.99 pazsan 122: [ [IFDEF] prelude-mask ] prelude, [ [THEN] ]
1.1 pazsan 123: align here last !
124: current @ 1 or A, \ link field; before revealing, it contains the
125: \ tagged reveal-into wordlist
1.110 pazsan 126: longstring, alias-mask lastflags cset
127: next-prelude @ 0<> prelude-mask and lastflags cset
128: next-prelude off
1.83 pazsan 129: cfalign ;
1.1 pazsan 130:
1.107 pazsan 131: defer (header)
132: defer header ( -- ) \ gforth
133: ' (header) IS header
134:
1.1 pazsan 135: : input-stream-header ( "name" -- )
1.80 pazsan 136: parse-name name-too-short? header, ;
1.1 pazsan 137:
138: : input-stream ( -- ) \ general
139: \G switches back to getting the name from the input stream ;
140: ['] input-stream-header IS (header) ;
141:
142: ' input-stream-header IS (header)
143:
1.32 anton 144: 2variable nextname-string
1.1 pazsan 145:
146: : nextname-header ( -- )
1.32 anton 147: nextname-string 2@ header,
148: nextname-string free-mem-var
1.1 pazsan 149: input-stream ;
150:
151: \ the next name is given in the string
152:
153: : nextname ( c-addr u -- ) \ gforth
1.19 anton 154: \g The next defined word will have the name @var{c-addr u}; the
155: \g defining word will leave the input stream alone.
1.1 pazsan 156: name-too-long?
1.32 anton 157: nextname-string free-mem-var
158: save-mem nextname-string 2!
1.1 pazsan 159: ['] nextname-header IS (header) ;
160:
161: : noname-header ( -- )
162: 0 last ! cfalign
163: input-stream ;
164:
165: : noname ( -- ) \ gforth
1.19 anton 166: \g The next defined word will be anonymous. The defining word will
167: \g leave the input stream alone. The xt of the defined word will
1.56 anton 168: \g be given by @code{latestxt}.
1.1 pazsan 169: ['] noname-header IS (header) ;
170:
1.56 anton 171: : latestxt ( -- xt ) \ gforth
1.15 crook 172: \G @i{xt} is the execution token of the last word defined.
1.13 crook 173: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 174: lastcfa @ ;
175:
1.56 anton 176: ' latestxt alias lastxt \ gforth-obsolete
177: \G old name for @code{latestxt}.
178:
179: : latest ( -- nt ) \ gforth
180: \G @var{nt} is the name token of the last word defined; it is 0 if the
181: \G last word has no name.
182: last @ ;
183:
1.1 pazsan 184: \ \ literals 17dec92py
185:
186: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 187: \G Compilation semantics: compile the run-time semantics.@*
188: \G Run-time Semantics: push @i{n}.@*
189: \G Interpretation semantics: undefined.
1.110 pazsan 190: postpone lit , ; immediate restrict
1.1 pazsan 191:
1.72 anton 192: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
193: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
194: \G placed on the stack. Interpretation semantics are undefined.
195: swap postpone Literal postpone Literal ; immediate restrict
196:
1.1 pazsan 197: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.110 pazsan 198: postpone lit A, ; immediate restrict
1.1 pazsan 199:
1.70 pazsan 200: Defer char@ ( addr u -- char addr' u' )
201: :noname over c@ -rot 1 /string ; IS char@
202:
1.8 crook 203: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 204: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
205: \G display code representing the first character of @i{ccc}.
1.87 pazsan 206: parse-name char@ 2drop ;
1.1 pazsan 207:
1.8 crook 208: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 209: \G Compilation: skip leading spaces. Parse the string
1.15 crook 210: \G @i{ccc}. Run-time: return @i{c}, the display code
211: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 212: \G semantics for this word are undefined.
1.1 pazsan 213: char postpone Literal ; immediate restrict
214:
215: \ \ threading 17mar93py
216:
1.111 ! pazsan 217: has? ec 0= [IF]
! 218: ' noop Alias recurse
! 219: \g Call the current definition.
! 220: unlock tlastcfa @ lock AConstant lastcfa
! 221: [ELSE]
! 222: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
! 223: \g Call the current definition.
! 224: latestxt compile, ; immediate restrict
! 225: [THEN]
! 226:
1.1 pazsan 227: : cfa, ( code-address -- ) \ gforth cfa-comma
228: here
229: dup lastcfa !
1.110 pazsan 230: 0 A, 0 ,
1.84 pazsan 231: code-address! ;
1.1 pazsan 232:
1.14 jwilke 233: [IFUNDEF] compile,
1.34 anton 234: defer compile, ( xt -- ) \ core-ext compile-comma
235: \G Compile the word represented by the execution token @i{xt}
236: \G into the current definition.
237:
238: ' , is compile,
1.14 jwilke 239: [THEN]
1.1 pazsan 240:
1.40 anton 241: defer basic-block-end ( -- )
242:
1.60 anton 243: :noname ( -- )
244: 0 compile-prim1 ;
245: is basic-block-end
1.40 anton 246:
1.99 pazsan 247: has? primcentric [IF]
248: has? peephole [IF]
249: \ dynamic only
250: : peephole-compile, ( xt -- )
251: \ compile xt, appending its code to the current dynamic superinstruction
252: here swap , compile-prim1 ;
253: [ELSE]
254: : peephole-compile, ( xt -- addr ) @ , ;
255: [THEN]
1.40 anton 256:
1.35 anton 257: : compile-to-prims, ( xt -- )
258: \G compile xt to use primitives (and their peephole optimization)
259: \G instead of ","-ing the xt.
260: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 261: dup >does-code if
1.66 anton 262: ['] does-exec peephole-compile, , EXIT
263: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 264: then
265: dup >code-address CASE
1.91 pazsan 266: dovalue: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
267: docon: OF >body @ ['] lit peephole-compile, , EXIT ENDOF
1.66 anton 268: \ docon: OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42 anton 269: \ docon is also used by VALUEs, so don't @ at compile time
1.66 anton 270: docol: OF >body ['] call peephole-compile, , EXIT ENDOF
271: dovar: OF >body ['] lit peephole-compile, , EXIT ENDOF
272: douser: OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
273: dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
274: dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
1.103 anton 275: \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.100 dvdkhlng 276: doabicode: OF >body ['] abi-call peephole-compile, , EXIT ENDOF
1.103 anton 277: do;abicode: OF ['] ;abi-code-exec peephole-compile, , EXIT ENDOF
1.104 anton 278: \ code words and ;code-defined words (code words could be
279: \ optimized, if we could identify them):
1.105 anton 280: dup in-dictionary? IF ( xt code-address )
281: over >body = if ( xt )
282: \ definitely a CODE word
283: peephole-compile, EXIT THEN
284: \ not sure, might be a ;CODE word
285: ['] lit-execute peephole-compile, , EXIT
1.104 anton 286: \ drop POSTPONE literal ['] execute peephole-compile, EXIT
287: THEN
1.35 anton 288: ENDCASE
1.49 anton 289: peephole-compile, ;
1.35 anton 290:
291: ' compile-to-prims, IS compile,
1.36 pazsan 292: [ELSE]
293: ' , is compile,
294: [THEN]
1.34 anton 295:
1.1 pazsan 296: : !does ( addr -- ) \ gforth store-does
1.56 anton 297: latestxt does-code! ;
1.1 pazsan 298:
1.61 pazsan 299: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63 anton 300: true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1 pazsan 301:
302: \ \ ticks
303:
1.90 anton 304: : name>comp ( nt -- w xt ) \ gforth name-to-comp
1.15 crook 305: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 306: (name>comp)
307: 1 = if
308: ['] execute
309: else
310: ['] compile,
311: then ;
312:
313: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
314: (') postpone ALiteral ; immediate restrict
315:
316: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 317: \g @i{xt} represents @i{name}'s interpretation
318: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 319: \g interpretation semantics.
320: ' postpone ALiteral ; immediate restrict
321:
1.5 anton 322: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 323: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 324: (') name>comp ;
325:
326: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 327: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 328: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
329:
1.18 jwilke 330: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 331: \g Compile the compilation semantics represented by the
332: \g compilation token @i{w xt}.
1.18 jwilke 333: dup ['] execute =
334: if
335: drop compile,
336: else
1.61 pazsan 337: swap POSTPONE aliteral compile,
1.18 jwilke 338: then ;
339:
1.109 pazsan 340: has? recognizer [IF]
341: include ./recognizer.fs
342: [ELSE]
1.18 jwilke 343: : POSTPONE ( "name" -- ) \ core
344: \g Compiles the compilation semantics of @i{name}.
1.48 anton 345: COMP' postpone, ; immediate
1.109 pazsan 346: [THEN]
1.18 jwilke 347:
1.1 pazsan 348: \ \ compiler loop
349:
1.109 pazsan 350: has? recognizer 0= [IF]
1.72 anton 351: : compiler1 ( c-addr u -- ... xt )
1.99 pazsan 352: 2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
1.1 pazsan 353: if ( c-addr u nt )
1.72 anton 354: nip nip name>comp
1.1 pazsan 355: else
356: drop
1.72 anton 357: 2dup 2>r snumber? dup
1.1 pazsan 358: IF
359: 0>
360: IF
1.72 anton 361: ['] 2literal
362: ELSE
363: ['] literal
1.1 pazsan 364: THEN
1.72 anton 365: 2rdrop
1.1 pazsan 366: ELSE
1.72 anton 367: drop 2r> compiler-notfound1
1.1 pazsan 368: THEN
369: then ;
370:
1.22 crook 371: : [ ( -- ) \ core left-bracket
1.8 crook 372: \G Enter interpretation state. Immediate word.
1.72 anton 373: ['] interpreter1 IS parser1 state off ; immediate
1.1 pazsan 374:
375: : ] ( -- ) \ core right-bracket
1.8 crook 376: \G Enter compilation state.
1.72 anton 377: ['] compiler1 IS parser1 state on ;
1.109 pazsan 378: [THEN]
1.1 pazsan 379:
380: \ \ Strings 22feb93py
381:
1.44 anton 382: : S, ( addr u -- )
1.45 anton 383: \ allot string as counted string
1.110 pazsan 384: here over char+ allot place align ;
1.45 anton 385:
386: : mem, ( addr u -- )
387: \ allot the memory block HERE (do alignment yourself)
1.110 pazsan 388: here over allot swap move ;
1.1 pazsan 389:
1.44 anton 390: : ," ( "string"<"> -- )
391: [char] " parse s, ;
1.1 pazsan 392:
393: \ \ Header states 23feb93py
394:
1.83 pazsan 395: \ problematic only for big endian machines
396:
1.1 pazsan 397: : cset ( bmask c-addr -- )
1.30 anton 398: tuck @ or swap ! ;
1.1 pazsan 399:
400: : creset ( bmask c-addr -- )
1.30 anton 401: tuck @ swap invert and swap ! ;
1.1 pazsan 402:
403: : ctoggle ( bmask c-addr -- )
1.30 anton 404: tuck @ xor swap ! ;
1.1 pazsan 405:
406: : lastflags ( -- c-addr )
407: \ the address of the flags byte in the last header
408: \ aborts if the last defined word was headerless
1.56 anton 409: latest dup 0= abort" last word was headerless" cell+ ;
1.1 pazsan 410:
411: : immediate ( -- ) \ core
1.10 crook 412: \G Make the compilation semantics of a word be to @code{execute}
413: \G the execution semantics.
1.110 pazsan 414: immediate-mask lastflags cset ;
1.1 pazsan 415:
416: : restrict ( -- ) \ gforth
1.10 crook 417: \G A synonym for @code{compile-only}
1.110 pazsan 418: restrict-mask lastflags cset ;
1.18 jwilke 419:
1.1 pazsan 420: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 421: \G Remove the interpretation semantics of a word.
1.1 pazsan 422:
423: \ \ Create Variable User Constant 17mar93py
424:
1.15 crook 425: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 426: Header reveal
427: alias-mask lastflags creset
428: dup A, lastcfa ! ;
429:
430: : Create ( "name" -- ) \ core
431: Header reveal dovar: cfa, ;
432:
1.108 pazsan 433: : buffer: ( u "name" -- ) \ core ext
434: Create allot ;
435:
1.1 pazsan 436: : Variable ( "name" -- ) \ core
437: Create 0 , ;
438:
439: : AVariable ( "name" -- ) \ gforth
440: Create 0 A, ;
441:
1.22 crook 442: : 2Variable ( "name" -- ) \ double two-variable
1.85 pazsan 443: Create 0 , 0 , ;
1.1 pazsan 444:
1.21 crook 445: : uallot ( n -- ) \ gforth
446: udp @ swap udp +! ;
1.1 pazsan 447:
448: : User ( "name" -- ) \ gforth
449: Header reveal douser: cfa, cell uallot , ;
450:
451: : AUser ( "name" -- ) \ gforth
452: User ;
453:
1.110 pazsan 454: : (Constant) Header reveal docon: cfa, ;
1.1 pazsan 455:
1.110 pazsan 456: : (Value) Header reveal dovalue: cfa, ;
1.76 pazsan 457:
1.1 pazsan 458: : Constant ( w "name" -- ) \ core
1.15 crook 459: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 460: \G
1.15 crook 461: \G @i{name} execution: @i{-- w}
1.1 pazsan 462: (Constant) , ;
463:
464: : AConstant ( addr "name" -- ) \ gforth
465: (Constant) A, ;
466:
467: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 468: (Value) , ;
1.1 pazsan 469:
1.37 jwilke 470: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 471: (Value) A, ;
1.37 jwilke 472:
1.22 crook 473: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 474: Create ( w1 w2 "name" -- )
475: 2,
476: DOES> ( -- w1 w2 )
477: 2@ ;
1.110 pazsan 478:
479: : (Field) Header reveal dofield: cfa, ;
1.39 pazsan 480:
481: \ \ interpret/compile:
482:
483: struct
484: >body
485: cell% field interpret/compile-int
486: cell% field interpret/compile-comp
487: end-struct interpret/compile-struct
488:
489: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
490: Create immediate swap A, A,
491: DOES>
492: abort" executed primary cfa of an interpret/compile: word" ;
493: \ state @ IF cell+ THEN perform ;
494:
1.1 pazsan 495: \ IS Defer What's Defers TO 24feb93py
496:
1.68 anton 497: defer defer-default ( -- )
1.69 anton 498: ' abort is defer-default
499: \ default action for deferred words (overridden by a warning later)
1.67 anton 500:
1.1 pazsan 501: : Defer ( "name" -- ) \ gforth
1.67 anton 502: \G Define a deferred word @i{name}; its execution semantics can be
503: \G set with @code{defer!} or @code{is} (and they have to, before first
504: \G executing @i{name}.
1.1 pazsan 505: Header Reveal dodefer: cfa,
1.110 pazsan 506: ['] defer-default A, ;
1.1 pazsan 507:
1.67 anton 508: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
509: \G @i{xt} represents the word currently associated with the deferred
510: \G word @i{xt-deferred}.
1.110 pazsan 511: >body @ ;
1.67 anton 512:
1.25 anton 513: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
514: \G Compiles the present contents of the deferred word @i{name}
515: \G into the current definition. I.e., this produces static
516: \G binding as if @i{name} was not deferred.
1.67 anton 517: ' defer@ compile, ; immediate
1.18 jwilke 518:
1.103 anton 519: : does>-like ( xt -- )
520: \ xt ( addr -- ) is !does or !;abi-code etc, addr is the address
521: \ that should be stored right after the code address.
522: >r ;-hook ?struc
1.110 pazsan 523: exit-like
1.103 anton 524: here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
525: postpone aliteral r> compile, [compile] exit
526: [ has? peephole [IF] ] finish-code [ [THEN] ]
527: defstart ;
528:
1.18 jwilke 529: :noname
1.101 anton 530: here !does ]
1.18 jwilke 531: defstart :-hook ;
532: :noname
1.103 anton 533: ['] !does does>-like :-hook ;
1.18 jwilke 534: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
535:
1.73 anton 536: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 537: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
1.110 pazsan 538: >body ! ;
1.67 anton 539:
1.20 anton 540: : <IS> ( "name" xt -- ) \ gforth
541: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 542: ' defer! ;
1.20 anton 543:
544: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
545: \g At run-time, changes the @code{defer}red word @var{name} to
546: \g execute @var{xt}.
1.67 anton 547: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 548:
1.20 anton 549: ' <IS>
1.18 jwilke 550: ' [IS]
1.67 anton 551: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
552: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
553: \G Its compilation semantics parses at compile time.
1.18 jwilke 554:
1.20 anton 555: ' <IS>
556: ' [IS]
557: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 558:
559: : interpret/compile? ( xt -- flag )
560: >does-code ['] DOES> >does-code = ;
1.1 pazsan 561:
562: \ \ : ; 24feb93py
563:
564: defer :-hook ( sys1 -- sys2 )
565:
566: defer ;-hook ( sys2 -- sys1 )
567:
1.16 jwilke 568: 0 Constant defstart
569:
1.7 anton 570: : (:noname) ( -- colon-sys )
571: \ common factor of : and :noname
1.34 anton 572: docol: cfa,
1.40 anton 573: defstart ] :-hook ;
1.7 anton 574:
1.1 pazsan 575: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 576: Header (:noname) ;
577:
578: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
579: 0 last !
580: cfalign here (:noname) ;
1.1 pazsan 581:
582: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 583: ;-hook ?struc [compile] exit
584: [ has? peephole [IF] ] finish-code [ [THEN] ]
585: reveal postpone [ ; immediate restrict
1.1 pazsan 586:
587: \ \ Search list handling: reveal words, recursive 23feb93py
588:
589: : last? ( -- false / nfa nfa )
1.56 anton 590: latest ?dup ;
1.1 pazsan 591:
1.83 pazsan 592: Variable warnings ( -- addr ) \ gforth
593: G -1 warnings T !
594:
1.1 pazsan 595: : (reveal) ( nt wid -- )
1.3 pazsan 596: wordlist-id dup >r
1.1 pazsan 597: @ over ( name>link ) !
598: r> ! ;
599:
600: \ make entry in wordlist-map
601: ' (reveal) f83search reveal-method !
602:
603: : check-shadow ( addr count wid -- )
1.2 pazsan 604: \G prints a warning if the string is already present in the wordlist
605: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
606: >stderr
607: ." redefined " name>string 2dup type
1.43 anton 608: str= 0= if
1.2 pazsan 609: ." with " type
610: else
611: 2drop
612: then
613: space space EXIT
614: then
615: 2drop 2drop ;
1.1 pazsan 616:
617: : reveal ( -- ) \ gforth
618: last?
619: if \ the last word has a header
620: dup ( name>link ) @ 1 and
621: if \ it is still hidden
622: dup ( name>link ) @ 1 xor ( nt wid )
623: 2dup >r name>string r> check-shadow ( nt wid )
1.83 pazsan 624: dup wordlist-map @ reveal-method perform
1.1 pazsan 625: else
626: drop
627: then
628: then ;
629:
630: : rehash ( wid -- )
631: dup wordlist-map @ rehash-method perform ;
632:
633: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 634: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 635: \g recursively.
636: immediate restrict
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>