Annotation of gforth/kernel/comp.fs, revision 1.29

1.1       pazsan      1: \ compiler definitions                                         14sep97jaw
                      2: 
1.28      anton       3: \ Copyright (C) 1995,1996,1997,1998,2000 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.
1.1       pazsan     51:     here 1 chars allot c! ;
                     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.
1.1       pazsan     55:     here cell allot  ! ;
                     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).
1.1       pazsan     60:     here 2 cells allot 2! ;
                     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
                    108:     dup c, here swap chars dup allot move ;
                    109: 
                    110: : header, ( c-addr u -- ) \ gforth
                    111:     name-too-long?
                    112:     align here last !
                    113:     current @ 1 or A,  \ link field; before revealing, it contains the
                    114:                        \ tagged reveal-into wordlist
                    115:     string, cfalign
                    116:     alias-mask lastflags cset ;
                    117: 
                    118: : input-stream-header ( "name" -- )
                    119:     name name-too-short? header, ;
                    120: 
                    121: : input-stream ( -- )  \ general
                    122:     \G switches back to getting the name from the input stream ;
                    123:     ['] input-stream-header IS (header) ;
                    124: 
                    125: ' input-stream-header IS (header)
                    126: 
                    127: \ !! make that a 2variable
                    128: create nextname-buffer 32 chars allot
                    129: 
                    130: : nextname-header ( -- )
                    131:     nextname-buffer count header,
                    132:     input-stream ;
                    133: 
                    134: \ the next name is given in the string
                    135: 
                    136: : nextname ( c-addr u -- ) \ gforth
1.19      anton     137:     \g The next defined word will have the name @var{c-addr u}; the
                    138:     \g defining word will leave the input stream alone.
1.1       pazsan    139:     name-too-long?
                    140:     nextname-buffer c! ( c-addr )
                    141:     nextname-buffer count move
                    142:     ['] nextname-header IS (header) ;
                    143: 
                    144: : noname-header ( -- )
                    145:     0 last ! cfalign
                    146:     input-stream ;
                    147: 
                    148: : noname ( -- ) \ gforth
1.19      anton     149:     \g The next defined word will be anonymous. The defining word will
                    150:     \g leave the input stream alone. The xt of the defined word will
                    151:     \g be given by @code{lastxt}.
1.1       pazsan    152:     ['] noname-header IS (header) ;
                    153: 
                    154: : lastxt ( -- xt ) \ gforth
1.15      crook     155:     \G @i{xt} is the execution token of the last word defined.
1.13      crook     156:     \ The main purpose of this word is to get the xt of words defined using noname
1.1       pazsan    157:     lastcfa @ ;
                    158: 
                    159: \ \ literals                                                   17dec92py
                    160: 
                    161: : Literal  ( compilation n -- ; run-time -- n ) \ core
1.27      anton     162:     \G Compilation semantics: compile the run-time semantics.@*
                    163:     \G Run-time Semantics: push @i{n}.@*
                    164:     \G Interpretation semantics: undefined.
1.14      jwilke    165: [ [IFDEF] lit, ]
                    166:     lit,
                    167: [ [ELSE] ]
1.27      anton     168:     postpone lit ,
1.14      jwilke    169: [ [THEN] ] ; immediate restrict
1.1       pazsan    170: 
                    171: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14      jwilke    172: [ [IFDEF] alit, ]
                    173:     alit,
                    174: [ [ELSE] ]
                    175:     postpone lit A, 
                    176: [ [THEN] ] ; immediate restrict
1.1       pazsan    177: 
1.8       crook     178: : char   ( '<spaces>ccc' -- c ) \ core
1.15      crook     179:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    180:     \G display code representing the first character of @i{ccc}.
1.1       pazsan    181:     bl word char+ c@ ;
                    182: 
1.8       crook     183: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10      crook     184:     \G Compilation: skip leading spaces. Parse the string
1.15      crook     185:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    186:     \G representing the first character of @i{ccc}.  Interpretation
1.10      crook     187:     \G semantics for this word are undefined.
1.1       pazsan    188:     char postpone Literal ; immediate restrict
                    189: 
                    190: \ \ threading                                                  17mar93py
                    191: 
                    192: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    193:     here
                    194:     dup lastcfa !
                    195:     0 A, 0 ,  code-address! ;
                    196: 
1.14      jwilke    197: [IFUNDEF] compile,
1.1       pazsan    198: : compile, ( xt -- )   \ core-ext      compile-comma
1.26      anton     199:     \G  Compile the word represented by the execution token @i{xt}
1.15      crook     200:     \G  into the current definition.
1.1       pazsan    201:     A, ;
1.14      jwilke    202: [THEN]
1.1       pazsan    203: 
                    204: : !does    ( addr -- ) \ gforth        store-does
                    205:     lastxt does-code! ;
                    206: 
                    207: : (does>)  ( R: addr -- )
                    208:     r> cfaligned /does-handler + !does ;
                    209: 
                    210: : dodoes,  ( -- )
                    211:   cfalign here /does-handler allot does-handler! ;
                    212: 
                    213: : (compile) ( -- ) \ gforth
                    214:     r> dup cell+ >r @ compile, ;
                    215: 
                    216: \ \ ticks
                    217: 
                    218: : name>comp ( nt -- w xt ) \ gforth
1.15      crook     219:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    220:     (name>comp)
                    221:     1 = if
                    222:         ['] execute
                    223:     else
                    224:         ['] compile,
                    225:     then ;
                    226: 
                    227: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    228:     (') postpone ALiteral ; immediate restrict
                    229: 
                    230: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
1.15      crook     231:     \g @i{xt} represents @i{name}'s interpretation
                    232:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    233:     \g interpretation semantics.
                    234:     ' postpone ALiteral ; immediate restrict
                    235: 
1.5       anton     236: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
1.15      crook     237:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    238:     (') name>comp ;
                    239: 
                    240: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15      crook     241:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    242:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    243: 
1.18      jwilke    244: : postpone, ( w xt -- ) \ gforth       postpone-comma
1.26      anton     245:     \g Compile the compilation semantics represented by the
                    246:     \g compilation token @i{w xt}.
1.18      jwilke    247:     dup ['] execute =
                    248:     if
                    249:        drop compile,
                    250:     else
                    251:        dup ['] compile, =
                    252:        if
                    253:            drop POSTPONE (compile) a,
                    254:        else
                    255:            swap POSTPONE aliteral compile,
                    256:        then
                    257:     then ;
                    258: 
                    259: : POSTPONE ( "name" -- ) \ core
                    260:     \g Compiles the compilation semantics of @i{name}.
                    261:     COMP' postpone, ; immediate restrict
                    262: 
1.1       pazsan    263: \ \ recurse                                                    17may93jaw
                    264: 
                    265: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10      crook     266:     \g Call the current definition.
1.1       pazsan    267:     lastxt compile, ; immediate restrict
                    268: 
                    269: \ \ compiler loop
                    270: 
                    271: : compiler ( c-addr u -- )
                    272:     2dup find-name dup
                    273:     if ( c-addr u nt )
                    274:        nip nip name>comp execute
                    275:     else
                    276:        drop
                    277:        2dup snumber? dup
                    278:        IF
                    279:            0>
                    280:            IF
                    281:                swap postpone Literal
                    282:            THEN
                    283:            postpone Literal
                    284:            2drop
                    285:        ELSE
                    286:            drop compiler-notfound
                    287:        THEN
                    288:     then ;
                    289: 
1.22      crook     290: : [ ( -- ) \  core     left-bracket
1.8       crook     291:     \G Enter interpretation state. Immediate word.
1.1       pazsan    292:     ['] interpreter  IS parser state off ; immediate
                    293: 
                    294: : ] ( -- ) \ core      right-bracket
1.8       crook     295:     \G Enter compilation state.
1.1       pazsan    296:     ['] compiler     IS parser state on  ;
                    297: 
                    298: \ \ Strings                                                    22feb93py
                    299: 
                    300: : ," ( "string"<"> -- ) [char] " parse
                    301:   here over char+ allot  place align ;
                    302: 
                    303: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
1.15      crook     304:     \G Compilation: compile the string specified by @i{c-addr1},
                    305:     \G @i{u} into the current definition. Run-time: return
                    306:     \G @i{c-addr2 u} describing the address and length of the
1.10      crook     307:     \G string.
1.1       pazsan    308:     postpone (S") here over char+ allot  place align ;
                    309:                                              immediate restrict
                    310: 
                    311: \ \ abort"                                                     22feb93py
                    312: 
                    313: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext        abort-quote
1.15      crook     314:     \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
                    315:     \G displaying the string @i{ccc} if there is no exception frame on the
1.10      crook     316:     \G exception stack.
1.1       pazsan    317:     postpone (abort") ," ;        immediate restrict
                    318: 
                    319: \ \ Header states                                              23feb93py
                    320: 
                    321: : cset ( bmask c-addr -- )
                    322:     tuck c@ or swap c! ; 
                    323: 
                    324: : creset ( bmask c-addr -- )
                    325:     tuck c@ swap invert and swap c! ; 
                    326: 
                    327: : ctoggle ( bmask c-addr -- )
                    328:     tuck c@ xor swap c! ; 
                    329: 
                    330: : lastflags ( -- c-addr )
                    331:     \ the address of the flags byte in the last header
                    332:     \ aborts if the last defined word was headerless
                    333:     last @ dup 0= abort" last word was headerless" cell+ ;
                    334: 
                    335: : immediate ( -- ) \ core
1.10      crook     336:     \G Make the compilation semantics of a word be to @code{execute}
                    337:     \G the execution semantics.
1.1       pazsan    338:     immediate-mask lastflags cset ;
                    339: 
                    340: : restrict ( -- ) \ gforth
1.10      crook     341:     \G A synonym for @code{compile-only}
1.1       pazsan    342:     restrict-mask lastflags cset ;
1.18      jwilke    343: 
1.1       pazsan    344: ' restrict alias compile-only ( -- ) \ gforth
1.10      crook     345: \G Remove the interpretation semantics of a word.
1.1       pazsan    346: 
                    347: \ \ Create Variable User Constant                              17mar93py
                    348: 
1.15      crook     349: : Alias    ( xt "name" -- ) \ gforth
1.1       pazsan    350:     Header reveal
                    351:     alias-mask lastflags creset
                    352:     dup A, lastcfa ! ;
                    353: 
                    354: doer? :dovar [IF]
                    355: 
                    356: : Create ( "name" -- ) \ core
                    357:     Header reveal dovar: cfa, ;
                    358: [ELSE]
                    359: 
                    360: : Create ( "name" -- ) \ core
                    361:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    362: [THEN]
                    363: 
                    364: : Variable ( "name" -- ) \ core
                    365:     Create 0 , ;
                    366: 
                    367: : AVariable ( "name" -- ) \ gforth
                    368:     Create 0 A, ;
                    369: 
1.22      crook     370: : 2Variable ( "name" -- ) \ double two-variable
1.1       pazsan    371:     create 0 , 0 , ;
                    372: 
1.21      crook     373: : uallot ( n -- ) \ gforth
                    374:     udp @ swap udp +! ;
1.1       pazsan    375: 
                    376: doer? :douser [IF]
                    377: 
                    378: : User ( "name" -- ) \ gforth
                    379:     Header reveal douser: cfa, cell uallot , ;
                    380: 
                    381: : AUser ( "name" -- ) \ gforth
                    382:     User ;
                    383: [ELSE]
                    384: 
                    385: : User Create cell uallot , DOES> @ up @ + ;
                    386: 
                    387: : AUser User ;
                    388: [THEN]
                    389: 
                    390: doer? :docon [IF]
                    391:     : (Constant)  Header reveal docon: cfa, ;
                    392: [ELSE]
                    393:     : (Constant)  Create DOES> @ ;
                    394: [THEN]
                    395: 
                    396: : Constant ( w "name" -- ) \ core
1.15      crook     397:     \G Define a constant @i{name} with value @i{w}.
1.1       pazsan    398:     \G  
1.15      crook     399:     \G @i{name} execution: @i{-- w}
1.1       pazsan    400:     (Constant) , ;
                    401: 
                    402: : AConstant ( addr "name" -- ) \ gforth
                    403:     (Constant) A, ;
                    404: 
                    405: : Value ( w "name" -- ) \ core-ext
                    406:     (Constant) , ;
                    407: 
1.22      crook     408: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1       pazsan    409:     Create ( w1 w2 "name" -- )
                    410:         2,
                    411:     DOES> ( -- w1 w2 )
                    412:         2@ ;
                    413:     
                    414: doer? :dofield [IF]
                    415:     : (Field)  Header reveal dofield: cfa, ;
                    416: [ELSE]
                    417:     : (Field)  Create DOES> @ + ;
                    418: [THEN]
                    419: \ IS Defer What's Defers TO                            24feb93py
                    420: 
                    421: doer? :dodefer [IF]
                    422: 
                    423: : Defer ( "name" -- ) \ gforth
                    424:     \ !! shouldn't it be initialized with abort or something similar?
                    425:     Header Reveal dodefer: cfa,
                    426:     ['] noop A, ;
1.18      jwilke    427: 
1.1       pazsan    428: [ELSE]
                    429: 
                    430: : Defer ( "name" -- ) \ gforth
                    431:     Create ['] noop A,
                    432: DOES> @ execute ;
1.18      jwilke    433: 
1.1       pazsan    434: [THEN]
                    435: 
1.25      anton     436: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    437:     \G Compiles the present contents of the deferred word @i{name}
                    438:     \G into the current definition.  I.e., this produces static
                    439:     \G binding as if @i{name} was not deferred.
1.1       pazsan    440:     ' >body @ compile, ; immediate
1.18      jwilke    441: 
                    442: :noname
                    443:     dodoes, here !does ]
                    444:     defstart :-hook ;
                    445: :noname
                    446:     ;-hook ?struc
                    447:     [ has? xconds [IF] ] exit-like [ [THEN] ]
                    448:     postpone (does>) dodoes,
                    449:     defstart :-hook ;
                    450: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    451: 
1.20      anton     452: : <IS> ( "name" xt -- ) \ gforth
                    453:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    454:     ' >body ! ;
                    455: 
                    456: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    457:     \g At run-time, changes the @code{defer}red word @var{name} to
                    458:     \g execute @var{xt}.
1.18      jwilke    459:     ' >body postpone ALiteral postpone ! ; immediate restrict
                    460: 
1.20      anton     461: ' <IS>
1.18      jwilke    462: ' [IS]
                    463: interpret/compile: IS ( xt "name" -- ) \ gforth
1.21      crook     464: \G A combined word made up from @code{<IS>} and @code{[IS]}.
1.18      jwilke    465: 
1.20      anton     466: ' <IS>
                    467: ' [IS]
                    468: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18      jwilke    469: 
                    470: :noname    ' >body @ ;
                    471: :noname    ' >body postpone ALiteral postpone @ ;
1.25      anton     472: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
                    473: \G @i{Xt} is the XT that is currently assigned to @i{name}.
1.18      jwilke    474: 
                    475: \ \ interpret/compile:
                    476: 
                    477: struct
                    478:     >body
                    479:     cell% field interpret/compile-int
                    480:     cell% field interpret/compile-comp
                    481: end-struct interpret/compile-struct
                    482: 
                    483: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    484:     Create immediate swap A, A,
                    485: DOES>
                    486:     abort" executed primary cfa of an interpret/compile: word" ;
                    487: \    state @ IF  cell+  THEN  perform ;
                    488: 
                    489: : interpret/compile? ( xt -- flag )
                    490:     >does-code ['] DOES> >does-code = ;
1.1       pazsan    491: 
                    492: \ \ : ;                                                        24feb93py
                    493: 
                    494: defer :-hook ( sys1 -- sys2 )
                    495: 
                    496: defer ;-hook ( sys2 -- sys1 )
                    497: 
1.16      jwilke    498: 0 Constant defstart
                    499: 
1.14      jwilke    500: [IFDEF] docol,
                    501: : (:noname) ( -- colon-sys )
                    502:     \ common factor of : and :noname
                    503:     docol, ]comp defstart ] :-hook ;
                    504: [ELSE]
1.7       anton     505: : (:noname) ( -- colon-sys )
                    506:     \ common factor of : and :noname
                    507:     docol: cfa, defstart ] :-hook ;
1.14      jwilke    508: [THEN]
1.7       anton     509: 
1.1       pazsan    510: : : ( "name" -- colon-sys ) \ core     colon
1.7       anton     511:     Header (:noname) ;
                    512: 
                    513: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    514:     0 last !
                    515:     cfalign here (:noname) ;
1.1       pazsan    516: 
1.14      jwilke    517: [IFDEF] fini,
                    518: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    519:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    520: [ELSE]
1.1       pazsan    521: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
                    522:     ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1.14      jwilke    523: [THEN]
1.1       pazsan    524: 
                    525: \ \ Search list handling: reveal words, recursive              23feb93py
                    526: 
                    527: : last?   ( -- false / nfa nfa )
                    528:     last @ ?dup ;
                    529: 
                    530: : (reveal) ( nt wid -- )
1.3       pazsan    531:     wordlist-id dup >r
1.1       pazsan    532:     @ over ( name>link ) ! 
                    533:     r> ! ;
                    534: 
                    535: \ make entry in wordlist-map
                    536: ' (reveal) f83search reveal-method !
                    537: 
                    538: Variable warnings ( -- addr ) \ gforth
                    539: G -1 warnings T !
                    540: 
                    541: : check-shadow  ( addr count wid -- )
1.2       pazsan    542:     \G prints a warning if the string is already present in the wordlist
                    543:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    544:        >stderr
                    545:        ." redefined " name>string 2dup type
                    546:        compare 0<> if
                    547:            ."  with " type
                    548:        else
                    549:            2drop
                    550:        then
                    551:        space space EXIT
                    552:     then
                    553:     2drop 2drop ;
1.1       pazsan    554: 
                    555: : reveal ( -- ) \ gforth
                    556:     last?
                    557:     if \ the last word has a header
                    558:        dup ( name>link ) @ 1 and
                    559:        if \ it is still hidden
                    560:            dup ( name>link ) @ 1 xor           ( nt wid )
                    561:            2dup >r name>string r> check-shadow ( nt wid )
                    562:            dup wordlist-map @ reveal-method perform
                    563:        else
                    564:            drop
                    565:        then
                    566:     then ;
                    567: 
                    568: : rehash  ( wid -- )
                    569:     dup wordlist-map @ rehash-method perform ;
                    570: 
                    571: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10      crook     572: \g Make the current definition visible, enabling it to call itself
1.1       pazsan    573: \g recursively.
                    574:        immediate restrict

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