Annotation of gforth/kernel/comp.fs, revision 1.96
1.1 pazsan 1: \ compiler definitions 14sep97jaw
2:
1.95 anton 3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008 Free Software Foundation, Inc.
1.6 anton 4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
1.93 anton 9: \ as published by the Free Software Foundation, either version 3
1.6 anton 10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
1.93 anton 18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.6 anton 19:
1.1 pazsan 20: \ \ Revisions-Log
21:
22: \ put in seperate file 14sep97jaw
23:
24: \ \ here allot , c, A, 17dec92py
25:
1.14 jwilke 26: [IFUNDEF] allot
27: [IFUNDEF] forthstart
28: : allot ( n -- ) \ core
29: dup unused u> -8 and throw
30: dp +! ;
31: [THEN]
32: [THEN]
33:
34: \ we default to this version if we have nothing else 05May99jaw
35: [IFUNDEF] allot
1.1 pazsan 36: : allot ( n -- ) \ core
1.23 anton 37: \G Reserve @i{n} address units of data space without
38: \G initialization. @i{n} is a signed number, passing a negative
39: \G @i{n} releases memory. In ANS Forth you can only deallocate
40: \G memory from the current contiguous region in this way. In
41: \G Gforth you can deallocate anything in this way but named words.
42: \G The system does not check this restriction.
1.12 anton 43: here +
44: dup 1- usable-dictionary-end forthstart within -8 and throw
45: dp ! ;
1.14 jwilke 46: [THEN]
1.1 pazsan 47:
1.22 crook 48: : c, ( c -- ) \ core c-comma
1.15 crook 49: \G Reserve data space for one char and store @i{c} in the space.
1.84 pazsan 50: here 1 chars allot [ has? flash [IF] ] flashc! [ [ELSE] ] c! [ [THEN] ] ;
1.1 pazsan 51:
1.22 crook 52: : , ( w -- ) \ core comma
1.15 crook 53: \G Reserve data space for one cell and store @i{w} in the space.
1.84 pazsan 54: here cell allot [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] ;
1.1 pazsan 55:
56: : 2, ( w1 w2 -- ) \ gforth
1.15 crook 57: \G Reserve data space for two cells and store the double @i{w1
1.24 anton 58: \G w2} there, @i{w2} first (lower address).
1.84 pazsan 59: here 2 cells allot [ has? flash [IF] ] tuck flash! cell+ flash!
60: [ [ELSE] ] 2! [ [THEN] ] ;
1.1 pazsan 61:
62: \ : aligned ( addr -- addr' ) \ core
63: \ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
64:
65: : align ( -- ) \ core
1.15 crook 66: \G If the data-space pointer is not aligned, reserve enough space to align it.
1.1 pazsan 67: here dup aligned swap ?DO bl c, LOOP ;
68:
1.22 crook 69: \ : faligned ( addr -- f-addr ) \ float f-aligned
1.1 pazsan 70: \ [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
71:
1.22 crook 72: : falign ( -- ) \ float f-align
1.15 crook 73: \G If the data-space pointer is not float-aligned, reserve
74: \G enough space to align it.
1.1 pazsan 75: here dup faligned swap
76: ?DO
77: bl c,
78: LOOP ;
79:
1.9 anton 80: : maxalign ( -- ) \ gforth
1.23 anton 81: \G Align data-space pointer for all alignment requirements.
1.1 pazsan 82: here dup maxaligned swap
83: ?DO
84: bl c,
85: LOOP ;
86:
87: \ the code field is aligned if its body is maxaligned
88: ' maxalign Alias cfalign ( -- ) \ gforth
1.24 anton 89: \G Align data-space pointer for code field requirements (i.e., such
90: \G that the corresponding body is maxaligned).
1.1 pazsan 91:
92: ' , alias A, ( addr -- ) \ gforth
93:
94: ' NOOP ALIAS const
95:
96: \ \ Header 23feb93py
97:
98: \ input-stream, nextname and noname are quite ugly (passing
99: \ information through global variables), but they are useful for dealing
100: \ with existing/independent defining words
101:
102: defer (header)
103: defer header ( -- ) \ gforth
104: ' (header) IS header
105:
106: : string, ( c-addr u -- ) \ gforth
107: \G puts down string as cstring
1.83 pazsan 108: dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
1.84 pazsan 109: [ has? flash [IF] ]
110: bounds ?DO I c@ c, LOOP
111: [ [ELSE] ]
112: here swap chars dup allot move
113: [ [THEN] ] ;
1.1 pazsan 114:
1.30 anton 115: : longstring, ( c-addr u -- ) \ gforth
1.55 anton 116: \G puts down string as longcstring
1.30 anton 117: dup , here swap chars dup allot move ;
118:
1.96 ! anton 119: variable next-prelude
! 120:
! 121: : prelude, ( -- )
! 122: next-prelude @ if
! 123: align next-prelude @ ,
! 124: then ;
! 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 !
1.96 ! anton 129: prelude,
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:
146: : input-stream-header ( "name" -- )
1.80 pazsan 147: parse-name name-too-short? header, ;
1.1 pazsan 148:
149: : input-stream ( -- ) \ general
150: \G switches back to getting the name from the input stream ;
151: ['] input-stream-header IS (header) ;
152:
153: ' input-stream-header IS (header)
154:
1.32 anton 155: 2variable nextname-string
1.1 pazsan 156:
1.33 pazsan 157: has? OS [IF]
1.1 pazsan 158: : nextname-header ( -- )
1.32 anton 159: nextname-string 2@ header,
160: nextname-string free-mem-var
1.1 pazsan 161: input-stream ;
1.33 pazsan 162: [THEN]
1.1 pazsan 163:
164: \ the next name is given in the string
165:
1.33 pazsan 166: has? OS [IF]
1.1 pazsan 167: : nextname ( c-addr u -- ) \ gforth
1.19 anton 168: \g The next defined word will have the name @var{c-addr u}; the
169: \g defining word will leave the input stream alone.
1.1 pazsan 170: name-too-long?
1.32 anton 171: nextname-string free-mem-var
172: save-mem nextname-string 2!
1.1 pazsan 173: ['] nextname-header IS (header) ;
1.33 pazsan 174: [THEN]
1.1 pazsan 175:
176: : noname-header ( -- )
177: 0 last ! cfalign
178: input-stream ;
179:
180: : noname ( -- ) \ gforth
1.19 anton 181: \g The next defined word will be anonymous. The defining word will
182: \g leave the input stream alone. The xt of the defined word will
1.56 anton 183: \g be given by @code{latestxt}.
1.1 pazsan 184: ['] noname-header IS (header) ;
185:
1.56 anton 186: : latestxt ( -- xt ) \ gforth
1.15 crook 187: \G @i{xt} is the execution token of the last word defined.
1.13 crook 188: \ The main purpose of this word is to get the xt of words defined using noname
1.1 pazsan 189: lastcfa @ ;
190:
1.56 anton 191: ' latestxt alias lastxt \ gforth-obsolete
192: \G old name for @code{latestxt}.
193:
194: : latest ( -- nt ) \ gforth
195: \G @var{nt} is the name token of the last word defined; it is 0 if the
196: \G last word has no name.
197: last @ ;
198:
1.1 pazsan 199: \ \ literals 17dec92py
200:
201: : Literal ( compilation n -- ; run-time -- n ) \ core
1.27 anton 202: \G Compilation semantics: compile the run-time semantics.@*
203: \G Run-time Semantics: push @i{n}.@*
204: \G Interpretation semantics: undefined.
1.14 jwilke 205: [ [IFDEF] lit, ]
206: lit,
207: [ [ELSE] ]
1.27 anton 208: postpone lit ,
1.14 jwilke 209: [ [THEN] ] ; immediate restrict
1.1 pazsan 210:
1.72 anton 211: : 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
212: \G Compile appropriate code such that, at run-time, @i{w1 w2} are
213: \G placed on the stack. Interpretation semantics are undefined.
214: swap postpone Literal postpone Literal ; immediate restrict
215:
1.1 pazsan 216: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14 jwilke 217: [ [IFDEF] alit, ]
218: alit,
219: [ [ELSE] ]
220: postpone lit A,
221: [ [THEN] ] ; immediate restrict
1.1 pazsan 222:
1.70 pazsan 223: Defer char@ ( addr u -- char addr' u' )
224: :noname over c@ -rot 1 /string ; IS char@
225:
1.8 crook 226: : char ( '<spaces>ccc' -- c ) \ core
1.15 crook 227: \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
228: \G display code representing the first character of @i{ccc}.
1.87 pazsan 229: parse-name char@ 2drop ;
1.1 pazsan 230:
1.8 crook 231: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10 crook 232: \G Compilation: skip leading spaces. Parse the string
1.15 crook 233: \G @i{ccc}. Run-time: return @i{c}, the display code
234: \G representing the first character of @i{ccc}. Interpretation
1.10 crook 235: \G semantics for this word are undefined.
1.1 pazsan 236: char postpone Literal ; immediate restrict
237:
238: \ \ threading 17mar93py
239:
240: : cfa, ( code-address -- ) \ gforth cfa-comma
241: here
242: dup lastcfa !
1.84 pazsan 243: [ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
244: code-address! ;
1.1 pazsan 245:
1.14 jwilke 246: [IFUNDEF] compile,
1.34 anton 247: defer compile, ( xt -- ) \ core-ext compile-comma
248: \G Compile the word represented by the execution token @i{xt}
249: \G into the current definition.
250:
251: ' , is compile,
1.14 jwilke 252: [THEN]
1.1 pazsan 253:
1.80 pazsan 254: has? ec 0= [IF]
1.40 anton 255: defer basic-block-end ( -- )
256:
1.60 anton 257: :noname ( -- )
258: 0 compile-prim1 ;
259: is basic-block-end
1.80 pazsan 260: [THEN]
1.40 anton 261:
1.36 pazsan 262: has? peephole [IF]
1.40 anton 263:
264: \ dynamic only
1.49 anton 265: : peephole-compile, ( xt -- )
266: \ compile xt, appending its code to the current dynamic superinstruction
267: here swap , compile-prim1 ;
1.38 anton 268:
1.35 anton 269: : compile-to-prims, ( xt -- )
270: \G compile xt to use primitives (and their peephole optimization)
271: \G instead of ","-ing the xt.
272: \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39 pazsan 273: dup >does-code if
1.66 anton 274: ['] does-exec peephole-compile, , EXIT
275: \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35 anton 276: then
277: dup >code-address CASE
1.91 pazsan 278: dovalue: OF >body ['] lit@ peephole-compile, , EXIT ENDOF
279: docon: OF >body @ ['] lit peephole-compile, , EXIT ENDOF
1.66 anton 280: \ docon: OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42 anton 281: \ docon is also used by VALUEs, so don't @ at compile time
1.66 anton 282: docol: OF >body ['] call peephole-compile, , EXIT ENDOF
283: dovar: OF >body ['] lit peephole-compile, , EXIT ENDOF
284: douser: OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
285: dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
286: dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
287: \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.48 anton 288: \ code words and ;code-defined words (code words could be optimized):
1.66 anton 289: dup in-dictionary? IF drop POSTPONE literal ['] execute peephole-compile, EXIT THEN
1.35 anton 290: ENDCASE
1.49 anton 291: peephole-compile, ;
1.35 anton 292:
293: ' compile-to-prims, IS compile,
1.36 pazsan 294: [ELSE]
295: ' , is compile,
296: [THEN]
1.34 anton 297:
1.1 pazsan 298: : !does ( addr -- ) \ gforth store-does
1.56 anton 299: latestxt does-code! ;
1.1 pazsan 300:
1.65 anton 301: \ !! unused, but ifdefed/gosted in some places
1.1 pazsan 302: : (does>) ( R: addr -- )
1.62 anton 303: r> cfaligned /does-handler + !does ; \ !! no gforth-native
1.1 pazsan 304:
1.64 anton 305: : (does>2) ( addr -- )
306: cfaligned /does-handler + !does ;
307:
1.1 pazsan 308: : dodoes, ( -- )
309: cfalign here /does-handler allot does-handler! ;
310:
1.61 pazsan 311: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63 anton 312: true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1 pazsan 313:
314: \ \ ticks
315:
1.90 anton 316: : name>comp ( nt -- w xt ) \ gforth name-to-comp
1.15 crook 317: \G @i{w xt} is the compilation token for the word @i{nt}.
1.1 pazsan 318: (name>comp)
319: 1 = if
320: ['] execute
321: else
322: ['] compile,
323: then ;
324:
325: : [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
326: (') postpone ALiteral ; immediate restrict
327:
328: : ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
1.15 crook 329: \g @i{xt} represents @i{name}'s interpretation
330: \g semantics. Perform @code{-14 throw} if the word has no
1.1 pazsan 331: \g interpretation semantics.
332: ' postpone ALiteral ; immediate restrict
333:
1.5 anton 334: : COMP' ( "name" -- w xt ) \ gforth comp-tick
1.15 crook 335: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 336: (') name>comp ;
337:
338: : [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15 crook 339: \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1 pazsan 340: COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
341:
1.18 jwilke 342: : postpone, ( w xt -- ) \ gforth postpone-comma
1.26 anton 343: \g Compile the compilation semantics represented by the
344: \g compilation token @i{w xt}.
1.18 jwilke 345: dup ['] execute =
346: if
347: drop compile,
348: else
1.61 pazsan 349: swap POSTPONE aliteral compile,
1.18 jwilke 350: then ;
351:
352: : POSTPONE ( "name" -- ) \ core
353: \g Compiles the compilation semantics of @i{name}.
1.48 anton 354: COMP' postpone, ; immediate
1.18 jwilke 355:
1.1 pazsan 356: \ \ recurse 17may93jaw
357:
358: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10 crook 359: \g Call the current definition.
1.56 anton 360: latestxt compile, ; immediate restrict
1.1 pazsan 361:
362: \ \ compiler loop
363:
1.72 anton 364: : compiler1 ( c-addr u -- ... xt )
1.96 ! anton 365: 2dup find-name-run-prelude dup
1.1 pazsan 366: if ( c-addr u nt )
1.72 anton 367: nip nip name>comp
1.1 pazsan 368: else
369: drop
1.72 anton 370: 2dup 2>r snumber? dup
1.1 pazsan 371: IF
372: 0>
373: IF
1.72 anton 374: ['] 2literal
375: ELSE
376: ['] literal
1.1 pazsan 377: THEN
1.72 anton 378: 2rdrop
1.1 pazsan 379: ELSE
1.72 anton 380: drop 2r> compiler-notfound1
1.1 pazsan 381: THEN
382: then ;
383:
1.22 crook 384: : [ ( -- ) \ core left-bracket
1.8 crook 385: \G Enter interpretation state. Immediate word.
1.72 anton 386: ['] interpreter1 IS parser1 state off ; immediate
1.1 pazsan 387:
388: : ] ( -- ) \ core right-bracket
1.8 crook 389: \G Enter compilation state.
1.72 anton 390: ['] compiler1 IS parser1 state on ;
1.1 pazsan 391:
392: \ \ Strings 22feb93py
393:
1.44 anton 394: : S, ( addr u -- )
1.45 anton 395: \ allot string as counted string
1.84 pazsan 396: [ has? flash [IF] ]
397: dup c, bounds ?DO I c@ c, LOOP
398: [ [ELSE] ]
399: here over char+ allot place align
400: [ [THEN] ] ;
1.45 anton 401:
402: : mem, ( addr u -- )
403: \ allot the memory block HERE (do alignment yourself)
1.84 pazsan 404: [ has? flash [IF] ]
405: bounds ?DO I c@ c, LOOP
406: [ [ELSE] ]
407: here over allot swap move
408: [ [THEN] ] ;
1.1 pazsan 409:
1.44 anton 410: : ," ( "string"<"> -- )
411: [char] " parse s, ;
1.1 pazsan 412:
413: \ \ Header states 23feb93py
414:
1.83 pazsan 415: \ problematic only for big endian machines
416:
417: has? f83headerstring [IF]
418: : cset ( bmask c-addr -- )
419: tuck c@ or swap c! ;
420:
421: : creset ( bmask c-addr -- )
422: tuck c@ swap invert and swap c! ;
423:
424: : ctoggle ( bmask c-addr -- )
425: tuck c@ xor swap c! ;
426: [ELSE]
1.1 pazsan 427: : cset ( bmask c-addr -- )
1.30 anton 428: tuck @ or swap ! ;
1.1 pazsan 429:
430: : creset ( bmask c-addr -- )
1.30 anton 431: tuck @ swap invert and swap ! ;
1.1 pazsan 432:
433: : ctoggle ( bmask c-addr -- )
1.30 anton 434: tuck @ xor swap ! ;
1.83 pazsan 435: [THEN]
1.1 pazsan 436:
437: : lastflags ( -- c-addr )
438: \ the address of the flags byte in the last header
439: \ aborts if the last defined word was headerless
1.56 anton 440: latest dup 0= abort" last word was headerless" cell+ ;
1.1 pazsan 441:
442: : immediate ( -- ) \ core
1.10 crook 443: \G Make the compilation semantics of a word be to @code{execute}
444: \G the execution semantics.
1.83 pazsan 445: immediate-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.1 pazsan 446:
447: : restrict ( -- ) \ gforth
1.10 crook 448: \G A synonym for @code{compile-only}
1.83 pazsan 449: restrict-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
1.18 jwilke 450:
1.1 pazsan 451: ' restrict alias compile-only ( -- ) \ gforth
1.10 crook 452: \G Remove the interpretation semantics of a word.
1.1 pazsan 453:
454: \ \ Create Variable User Constant 17mar93py
455:
1.15 crook 456: : Alias ( xt "name" -- ) \ gforth
1.1 pazsan 457: Header reveal
458: alias-mask lastflags creset
459: dup A, lastcfa ! ;
460:
461: doer? :dovar [IF]
462:
463: : Create ( "name" -- ) \ core
464: Header reveal dovar: cfa, ;
465: [ELSE]
466:
467: : Create ( "name" -- ) \ core
468: Header reveal here lastcfa ! 0 A, 0 , DOES> ;
469: [THEN]
470:
1.85 pazsan 471: has? flash [IF]
1.87 pazsan 472: : (variable) dpp @ normal-dp = IF Create dpp @
1.85 pazsan 473: ELSE normal-dp @ Constant dpp @ ram THEN ;
474: : Variable ( "name" -- ) \ core
475: (Variable) 0 , dpp ! ;
476:
477: : AVariable ( "name" -- ) \ gforth
478: (Variable) 0 A, dpp ! ;
479:
480: : 2Variable ( "name" -- ) \ double two-variable
481: (Variable) 0 , 0 , dpp ! ;
482: [ELSE]
1.1 pazsan 483: : Variable ( "name" -- ) \ core
484: Create 0 , ;
485:
486: : AVariable ( "name" -- ) \ gforth
487: Create 0 A, ;
488:
1.22 crook 489: : 2Variable ( "name" -- ) \ double two-variable
1.85 pazsan 490: Create 0 , 0 , ;
491: [THEN]
1.1 pazsan 492:
1.75 pazsan 493: has? no-userspace 0= [IF]
1.21 crook 494: : uallot ( n -- ) \ gforth
495: udp @ swap udp +! ;
1.1 pazsan 496:
497: doer? :douser [IF]
498:
499: : User ( "name" -- ) \ gforth
500: Header reveal douser: cfa, cell uallot , ;
501:
502: : AUser ( "name" -- ) \ gforth
503: User ;
504: [ELSE]
505:
506: : User Create cell uallot , DOES> @ up @ + ;
507:
508: : AUser User ;
1.75 pazsan 509: [THEN]
1.1 pazsan 510: [THEN]
511:
512: doer? :docon [IF]
513: : (Constant) Header reveal docon: cfa, ;
514: [ELSE]
515: : (Constant) Create DOES> @ ;
516: [THEN]
517:
1.76 pazsan 518: doer? :dovalue [IF]
519: : (Value) Header reveal dovalue: cfa, ;
520: [ELSE]
521: has? rom [IF]
522: : (Value) Create DOES> @ @ ;
523: [ELSE]
524: : (Value) Create DOES> @ ;
525: [THEN]
526: [THEN]
527:
1.1 pazsan 528: : Constant ( w "name" -- ) \ core
1.15 crook 529: \G Define a constant @i{name} with value @i{w}.
1.1 pazsan 530: \G
1.15 crook 531: \G @i{name} execution: @i{-- w}
1.1 pazsan 532: (Constant) , ;
533:
534: : AConstant ( addr "name" -- ) \ gforth
535: (Constant) A, ;
536:
1.84 pazsan 537: has? flash [IF]
538: : Value ( w "name" -- ) \ core-ext
539: (Value) dpp @ >r here cell allot >r
540: ram here >r , r> r> flash! r> dpp ! ;
541:
542: ' Value alias AValue
543: [ELSE]
1.1 pazsan 544: : Value ( w "name" -- ) \ core-ext
1.76 pazsan 545: (Value) , ;
1.1 pazsan 546:
1.37 jwilke 547: : AValue ( w "name" -- ) \ core-ext
1.76 pazsan 548: (Value) A, ;
1.84 pazsan 549: [THEN]
1.37 jwilke 550:
1.22 crook 551: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1 pazsan 552: Create ( w1 w2 "name" -- )
553: 2,
554: DOES> ( -- w1 w2 )
555: 2@ ;
556:
557: doer? :dofield [IF]
558: : (Field) Header reveal dofield: cfa, ;
559: [ELSE]
560: : (Field) Create DOES> @ + ;
561: [THEN]
1.39 pazsan 562:
563: \ \ interpret/compile:
564:
565: struct
566: >body
567: cell% field interpret/compile-int
568: cell% field interpret/compile-comp
569: end-struct interpret/compile-struct
570:
571: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
572: Create immediate swap A, A,
573: DOES>
574: abort" executed primary cfa of an interpret/compile: word" ;
575: \ state @ IF cell+ THEN perform ;
576:
1.1 pazsan 577: \ IS Defer What's Defers TO 24feb93py
578:
1.68 anton 579: defer defer-default ( -- )
1.69 anton 580: ' abort is defer-default
581: \ default action for deferred words (overridden by a warning later)
1.67 anton 582:
1.1 pazsan 583: doer? :dodefer [IF]
584:
585: : Defer ( "name" -- ) \ gforth
1.67 anton 586: \G Define a deferred word @i{name}; its execution semantics can be
587: \G set with @code{defer!} or @code{is} (and they have to, before first
588: \G executing @i{name}.
1.1 pazsan 589: Header Reveal dodefer: cfa,
1.86 pazsan 590: [ has? rom [IF] ] here >r cell allot
591: dpp @ ram here r> flash! ['] defer-default A, dpp !
592: [ [ELSE] ] ['] defer-default A, [ [THEN] ] ;
1.18 jwilke 593:
1.1 pazsan 594: [ELSE]
595:
1.77 pazsan 596: has? rom [IF]
597: : Defer ( "name" -- ) \ gforth
1.86 pazsan 598: Create here >r cell allot
599: dpp @ ram here r> flash! ['] defer-default A, dpp !
1.77 pazsan 600: DOES> @ @ execute ;
601: [ELSE]
602: : Defer ( "name" -- ) \ gforth
603: Create ['] defer-default A,
604: DOES> @ execute ;
605: [THEN]
1.1 pazsan 606: [THEN]
607:
1.67 anton 608: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
609: \G @i{xt} represents the word currently associated with the deferred
610: \G word @i{xt-deferred}.
1.86 pazsan 611: >body @ [ has? rom [IF] ] @ [ [THEN] ] ;
1.67 anton 612:
1.25 anton 613: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
614: \G Compiles the present contents of the deferred word @i{name}
615: \G into the current definition. I.e., this produces static
616: \G binding as if @i{name} was not deferred.
1.67 anton 617: ' defer@ compile, ; immediate
1.18 jwilke 618:
619: :noname
620: dodoes, here !does ]
621: defstart :-hook ;
622: :noname
623: ;-hook ?struc
624: [ has? xconds [IF] ] exit-like [ [THEN] ]
1.84 pazsan 625: here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
626: postpone aliteral postpone (does>2) [compile] exit
1.80 pazsan 627: [ has? peephole [IF] ] finish-code [ [THEN] ] dodoes,
1.18 jwilke 628: defstart :-hook ;
629: interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
630:
1.73 anton 631: : defer! ( xt xt-deferred -- ) \ gforth defer-store
1.67 anton 632: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
1.86 pazsan 633: >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
1.67 anton 634:
1.20 anton 635: : <IS> ( "name" xt -- ) \ gforth
636: \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67 anton 637: ' defer! ;
1.20 anton 638:
639: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
640: \g At run-time, changes the @code{defer}red word @var{name} to
641: \g execute @var{xt}.
1.67 anton 642: ' postpone ALiteral postpone defer! ; immediate restrict
1.18 jwilke 643:
1.20 anton 644: ' <IS>
1.18 jwilke 645: ' [IS]
1.67 anton 646: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
647: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
648: \G Its compilation semantics parses at compile time.
1.18 jwilke 649:
1.20 anton 650: ' <IS>
651: ' [IS]
652: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18 jwilke 653:
654: : interpret/compile? ( xt -- flag )
655: >does-code ['] DOES> >does-code = ;
1.1 pazsan 656:
657: \ \ : ; 24feb93py
658:
659: defer :-hook ( sys1 -- sys2 )
660:
661: defer ;-hook ( sys2 -- sys1 )
662:
1.16 jwilke 663: 0 Constant defstart
664:
1.14 jwilke 665: [IFDEF] docol,
666: : (:noname) ( -- colon-sys )
667: \ common factor of : and :noname
1.34 anton 668: docol, ]comp
1.14 jwilke 669: [ELSE]
1.7 anton 670: : (:noname) ( -- colon-sys )
671: \ common factor of : and :noname
1.34 anton 672: docol: cfa,
1.14 jwilke 673: [THEN]
1.40 anton 674: defstart ] :-hook ;
1.7 anton 675:
1.1 pazsan 676: : : ( "name" -- colon-sys ) \ core colon
1.7 anton 677: Header (:noname) ;
678:
679: : :noname ( -- xt colon-sys ) \ core-ext colon-no-name
680: 0 last !
681: cfalign here (:noname) ;
1.1 pazsan 682:
1.14 jwilke 683: [IFDEF] fini,
684: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
685: ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
686: [ELSE]
1.1 pazsan 687: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
1.57 pazsan 688: ;-hook ?struc [compile] exit
689: [ has? peephole [IF] ] finish-code [ [THEN] ]
690: reveal postpone [ ; immediate restrict
1.14 jwilke 691: [THEN]
1.1 pazsan 692:
693: \ \ Search list handling: reveal words, recursive 23feb93py
694:
695: : last? ( -- false / nfa nfa )
1.56 anton 696: latest ?dup ;
1.1 pazsan 697:
1.83 pazsan 698: Variable warnings ( -- addr ) \ gforth
699: G -1 warnings T !
700:
701: has? ec [IF]
702: : reveal ( -- ) \ gforth
703: last?
704: if \ the last word has a header
705: dup ( name>link ) @ -1 =
706: if \ it is still hidden
1.88 pazsan 707: forth-wordlist dup >r @ over
1.84 pazsan 708: [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] r> !
1.83 pazsan 709: else
710: drop
711: then
712: then ;
713: [ELSE]
1.1 pazsan 714: : (reveal) ( nt wid -- )
1.3 pazsan 715: wordlist-id dup >r
1.1 pazsan 716: @ over ( name>link ) !
717: r> ! ;
718:
719: \ make entry in wordlist-map
720: ' (reveal) f83search reveal-method !
721:
722: : check-shadow ( addr count wid -- )
1.2 pazsan 723: \G prints a warning if the string is already present in the wordlist
724: >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
725: >stderr
726: ." redefined " name>string 2dup type
1.43 anton 727: str= 0= if
1.2 pazsan 728: ." with " type
729: else
730: 2drop
731: then
732: space space EXIT
733: then
734: 2drop 2drop ;
1.1 pazsan 735:
736: : reveal ( -- ) \ gforth
737: last?
738: if \ the last word has a header
739: dup ( name>link ) @ 1 and
740: if \ it is still hidden
741: dup ( name>link ) @ 1 xor ( nt wid )
742: 2dup >r name>string r> check-shadow ( nt wid )
1.83 pazsan 743: dup wordlist-map @ reveal-method perform
1.1 pazsan 744: else
745: drop
746: then
747: then ;
748:
749: : rehash ( wid -- )
750: dup wordlist-map @ rehash-method perform ;
1.80 pazsan 751: [THEN]
1.1 pazsan 752:
753: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10 crook 754: \g Make the current definition visible, enabling it to call itself
1.1 pazsan 755: \g recursively.
756: immediate restrict
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