Annotation of gforth/kernel/comp.fs, revision 1.30

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: 
1.30    ! anton     110: : longstring, ( c-addr u -- ) \ gforth
        !           111:     \G puts down string as cstring
        !           112:     dup , here swap chars dup allot move ;
        !           113: 
1.1       pazsan    114: : header, ( c-addr u -- ) \ gforth
                    115:     name-too-long?
                    116:     align here last !
                    117:     current @ 1 or A,  \ link field; before revealing, it contains the
                    118:                        \ tagged reveal-into wordlist
1.30    ! anton     119:     longstring, cfalign
1.1       pazsan    120:     alias-mask lastflags cset ;
                    121: 
                    122: : input-stream-header ( "name" -- )
                    123:     name name-too-short? header, ;
                    124: 
                    125: : input-stream ( -- )  \ general
                    126:     \G switches back to getting the name from the input stream ;
                    127:     ['] input-stream-header IS (header) ;
                    128: 
                    129: ' input-stream-header IS (header)
                    130: 
                    131: \ !! make that a 2variable
                    132: create nextname-buffer 32 chars allot
                    133: 
                    134: : nextname-header ( -- )
                    135:     nextname-buffer count header,
                    136:     input-stream ;
                    137: 
                    138: \ the next name is given in the string
                    139: 
                    140: : nextname ( c-addr u -- ) \ gforth
1.19      anton     141:     \g The next defined word will have the name @var{c-addr u}; the
                    142:     \g defining word will leave the input stream alone.
1.30    ! anton     143:     dup 31 u> -&19 and throw \ !! make buffer variable-sized
1.1       pazsan    144:     name-too-long?
                    145:     nextname-buffer c! ( c-addr )
                    146:     nextname-buffer count move
                    147:     ['] nextname-header IS (header) ;
                    148: 
                    149: : noname-header ( -- )
                    150:     0 last ! cfalign
                    151:     input-stream ;
                    152: 
                    153: : noname ( -- ) \ gforth
1.19      anton     154:     \g The next defined word will be anonymous. The defining word will
                    155:     \g leave the input stream alone. The xt of the defined word will
                    156:     \g be given by @code{lastxt}.
1.1       pazsan    157:     ['] noname-header IS (header) ;
                    158: 
                    159: : lastxt ( -- xt ) \ gforth
1.15      crook     160:     \G @i{xt} is the execution token of the last word defined.
1.13      crook     161:     \ The main purpose of this word is to get the xt of words defined using noname
1.1       pazsan    162:     lastcfa @ ;
                    163: 
                    164: \ \ literals                                                   17dec92py
                    165: 
                    166: : Literal  ( compilation n -- ; run-time -- n ) \ core
1.27      anton     167:     \G Compilation semantics: compile the run-time semantics.@*
                    168:     \G Run-time Semantics: push @i{n}.@*
                    169:     \G Interpretation semantics: undefined.
1.14      jwilke    170: [ [IFDEF] lit, ]
                    171:     lit,
                    172: [ [ELSE] ]
1.27      anton     173:     postpone lit ,
1.14      jwilke    174: [ [THEN] ] ; immediate restrict
1.1       pazsan    175: 
                    176: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14      jwilke    177: [ [IFDEF] alit, ]
                    178:     alit,
                    179: [ [ELSE] ]
                    180:     postpone lit A, 
                    181: [ [THEN] ] ; immediate restrict
1.1       pazsan    182: 
1.8       crook     183: : char   ( '<spaces>ccc' -- c ) \ core
1.15      crook     184:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    185:     \G display code representing the first character of @i{ccc}.
1.1       pazsan    186:     bl word char+ c@ ;
                    187: 
1.8       crook     188: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10      crook     189:     \G Compilation: skip leading spaces. Parse the string
1.15      crook     190:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    191:     \G representing the first character of @i{ccc}.  Interpretation
1.10      crook     192:     \G semantics for this word are undefined.
1.1       pazsan    193:     char postpone Literal ; immediate restrict
                    194: 
                    195: \ \ threading                                                  17mar93py
                    196: 
                    197: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    198:     here
                    199:     dup lastcfa !
                    200:     0 A, 0 ,  code-address! ;
                    201: 
1.14      jwilke    202: [IFUNDEF] compile,
1.1       pazsan    203: : compile, ( xt -- )   \ core-ext      compile-comma
1.26      anton     204:     \G  Compile the word represented by the execution token @i{xt}
1.15      crook     205:     \G  into the current definition.
1.1       pazsan    206:     A, ;
1.14      jwilke    207: [THEN]
1.1       pazsan    208: 
                    209: : !does    ( addr -- ) \ gforth        store-does
                    210:     lastxt does-code! ;
                    211: 
                    212: : (does>)  ( R: addr -- )
                    213:     r> cfaligned /does-handler + !does ;
                    214: 
                    215: : dodoes,  ( -- )
                    216:   cfalign here /does-handler allot does-handler! ;
                    217: 
                    218: : (compile) ( -- ) \ gforth
                    219:     r> dup cell+ >r @ compile, ;
                    220: 
                    221: \ \ ticks
                    222: 
                    223: : name>comp ( nt -- w xt ) \ gforth
1.15      crook     224:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    225:     (name>comp)
                    226:     1 = if
                    227:         ['] execute
                    228:     else
                    229:         ['] compile,
                    230:     then ;
                    231: 
                    232: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    233:     (') postpone ALiteral ; immediate restrict
                    234: 
                    235: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
1.15      crook     236:     \g @i{xt} represents @i{name}'s interpretation
                    237:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    238:     \g interpretation semantics.
                    239:     ' postpone ALiteral ; immediate restrict
                    240: 
1.5       anton     241: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
1.15      crook     242:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    243:     (') name>comp ;
                    244: 
                    245: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15      crook     246:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    247:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    248: 
1.18      jwilke    249: : postpone, ( w xt -- ) \ gforth       postpone-comma
1.26      anton     250:     \g Compile the compilation semantics represented by the
                    251:     \g compilation token @i{w xt}.
1.18      jwilke    252:     dup ['] execute =
                    253:     if
                    254:        drop compile,
                    255:     else
                    256:        dup ['] compile, =
                    257:        if
                    258:            drop POSTPONE (compile) a,
                    259:        else
                    260:            swap POSTPONE aliteral compile,
                    261:        then
                    262:     then ;
                    263: 
                    264: : POSTPONE ( "name" -- ) \ core
                    265:     \g Compiles the compilation semantics of @i{name}.
                    266:     COMP' postpone, ; immediate restrict
                    267: 
1.1       pazsan    268: \ \ recurse                                                    17may93jaw
                    269: 
                    270: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10      crook     271:     \g Call the current definition.
1.1       pazsan    272:     lastxt compile, ; immediate restrict
                    273: 
                    274: \ \ compiler loop
                    275: 
                    276: : compiler ( c-addr u -- )
                    277:     2dup find-name dup
                    278:     if ( c-addr u nt )
                    279:        nip nip name>comp execute
                    280:     else
                    281:        drop
                    282:        2dup snumber? dup
                    283:        IF
                    284:            0>
                    285:            IF
                    286:                swap postpone Literal
                    287:            THEN
                    288:            postpone Literal
                    289:            2drop
                    290:        ELSE
                    291:            drop compiler-notfound
                    292:        THEN
                    293:     then ;
                    294: 
1.22      crook     295: : [ ( -- ) \  core     left-bracket
1.8       crook     296:     \G Enter interpretation state. Immediate word.
1.1       pazsan    297:     ['] interpreter  IS parser state off ; immediate
                    298: 
                    299: : ] ( -- ) \ core      right-bracket
1.8       crook     300:     \G Enter compilation state.
1.1       pazsan    301:     ['] compiler     IS parser state on  ;
                    302: 
                    303: \ \ Strings                                                    22feb93py
                    304: 
                    305: : ," ( "string"<"> -- ) [char] " parse
                    306:   here over char+ allot  place align ;
                    307: 
                    308: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
1.15      crook     309:     \G Compilation: compile the string specified by @i{c-addr1},
                    310:     \G @i{u} into the current definition. Run-time: return
                    311:     \G @i{c-addr2 u} describing the address and length of the
1.10      crook     312:     \G string.
1.1       pazsan    313:     postpone (S") here over char+ allot  place align ;
                    314:                                              immediate restrict
                    315: 
                    316: \ \ abort"                                                     22feb93py
                    317: 
                    318: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext        abort-quote
1.15      crook     319:     \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
                    320:     \G displaying the string @i{ccc} if there is no exception frame on the
1.10      crook     321:     \G exception stack.
1.1       pazsan    322:     postpone (abort") ," ;        immediate restrict
                    323: 
                    324: \ \ Header states                                              23feb93py
                    325: 
                    326: : cset ( bmask c-addr -- )
1.30    ! anton     327:     tuck @ or swap ! ; 
1.1       pazsan    328: 
                    329: : creset ( bmask c-addr -- )
1.30    ! anton     330:     tuck @ swap invert and swap ! ; 
1.1       pazsan    331: 
                    332: : ctoggle ( bmask c-addr -- )
1.30    ! anton     333:     tuck @ xor swap ! ; 
1.1       pazsan    334: 
                    335: : lastflags ( -- c-addr )
                    336:     \ the address of the flags byte in the last header
                    337:     \ aborts if the last defined word was headerless
                    338:     last @ dup 0= abort" last word was headerless" cell+ ;
                    339: 
                    340: : immediate ( -- ) \ core
1.10      crook     341:     \G Make the compilation semantics of a word be to @code{execute}
                    342:     \G the execution semantics.
1.1       pazsan    343:     immediate-mask lastflags cset ;
                    344: 
                    345: : restrict ( -- ) \ gforth
1.10      crook     346:     \G A synonym for @code{compile-only}
1.1       pazsan    347:     restrict-mask lastflags cset ;
1.18      jwilke    348: 
1.1       pazsan    349: ' restrict alias compile-only ( -- ) \ gforth
1.10      crook     350: \G Remove the interpretation semantics of a word.
1.1       pazsan    351: 
                    352: \ \ Create Variable User Constant                              17mar93py
                    353: 
1.15      crook     354: : Alias    ( xt "name" -- ) \ gforth
1.1       pazsan    355:     Header reveal
                    356:     alias-mask lastflags creset
                    357:     dup A, lastcfa ! ;
                    358: 
                    359: doer? :dovar [IF]
                    360: 
                    361: : Create ( "name" -- ) \ core
                    362:     Header reveal dovar: cfa, ;
                    363: [ELSE]
                    364: 
                    365: : Create ( "name" -- ) \ core
                    366:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    367: [THEN]
                    368: 
                    369: : Variable ( "name" -- ) \ core
                    370:     Create 0 , ;
                    371: 
                    372: : AVariable ( "name" -- ) \ gforth
                    373:     Create 0 A, ;
                    374: 
1.22      crook     375: : 2Variable ( "name" -- ) \ double two-variable
1.1       pazsan    376:     create 0 , 0 , ;
                    377: 
1.21      crook     378: : uallot ( n -- ) \ gforth
                    379:     udp @ swap udp +! ;
1.1       pazsan    380: 
                    381: doer? :douser [IF]
                    382: 
                    383: : User ( "name" -- ) \ gforth
                    384:     Header reveal douser: cfa, cell uallot , ;
                    385: 
                    386: : AUser ( "name" -- ) \ gforth
                    387:     User ;
                    388: [ELSE]
                    389: 
                    390: : User Create cell uallot , DOES> @ up @ + ;
                    391: 
                    392: : AUser User ;
                    393: [THEN]
                    394: 
                    395: doer? :docon [IF]
                    396:     : (Constant)  Header reveal docon: cfa, ;
                    397: [ELSE]
                    398:     : (Constant)  Create DOES> @ ;
                    399: [THEN]
                    400: 
                    401: : Constant ( w "name" -- ) \ core
1.15      crook     402:     \G Define a constant @i{name} with value @i{w}.
1.1       pazsan    403:     \G  
1.15      crook     404:     \G @i{name} execution: @i{-- w}
1.1       pazsan    405:     (Constant) , ;
                    406: 
                    407: : AConstant ( addr "name" -- ) \ gforth
                    408:     (Constant) A, ;
                    409: 
                    410: : Value ( w "name" -- ) \ core-ext
                    411:     (Constant) , ;
                    412: 
1.22      crook     413: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1       pazsan    414:     Create ( w1 w2 "name" -- )
                    415:         2,
                    416:     DOES> ( -- w1 w2 )
                    417:         2@ ;
                    418:     
                    419: doer? :dofield [IF]
                    420:     : (Field)  Header reveal dofield: cfa, ;
                    421: [ELSE]
                    422:     : (Field)  Create DOES> @ + ;
                    423: [THEN]
                    424: \ IS Defer What's Defers TO                            24feb93py
                    425: 
                    426: doer? :dodefer [IF]
                    427: 
                    428: : Defer ( "name" -- ) \ gforth
                    429:     \ !! shouldn't it be initialized with abort or something similar?
                    430:     Header Reveal dodefer: cfa,
                    431:     ['] noop A, ;
1.18      jwilke    432: 
1.1       pazsan    433: [ELSE]
                    434: 
                    435: : Defer ( "name" -- ) \ gforth
                    436:     Create ['] noop A,
                    437: DOES> @ execute ;
1.18      jwilke    438: 
1.1       pazsan    439: [THEN]
                    440: 
1.25      anton     441: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    442:     \G Compiles the present contents of the deferred word @i{name}
                    443:     \G into the current definition.  I.e., this produces static
                    444:     \G binding as if @i{name} was not deferred.
1.1       pazsan    445:     ' >body @ compile, ; immediate
1.18      jwilke    446: 
                    447: :noname
                    448:     dodoes, here !does ]
                    449:     defstart :-hook ;
                    450: :noname
                    451:     ;-hook ?struc
                    452:     [ has? xconds [IF] ] exit-like [ [THEN] ]
                    453:     postpone (does>) dodoes,
                    454:     defstart :-hook ;
                    455: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    456: 
1.20      anton     457: : <IS> ( "name" xt -- ) \ gforth
                    458:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    459:     ' >body ! ;
                    460: 
                    461: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    462:     \g At run-time, changes the @code{defer}red word @var{name} to
                    463:     \g execute @var{xt}.
1.18      jwilke    464:     ' >body postpone ALiteral postpone ! ; immediate restrict
                    465: 
1.20      anton     466: ' <IS>
1.18      jwilke    467: ' [IS]
                    468: interpret/compile: IS ( xt "name" -- ) \ gforth
1.21      crook     469: \G A combined word made up from @code{<IS>} and @code{[IS]}.
1.18      jwilke    470: 
1.20      anton     471: ' <IS>
                    472: ' [IS]
                    473: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18      jwilke    474: 
                    475: :noname    ' >body @ ;
                    476: :noname    ' >body postpone ALiteral postpone @ ;
1.25      anton     477: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
                    478: \G @i{Xt} is the XT that is currently assigned to @i{name}.
1.18      jwilke    479: 
                    480: \ \ interpret/compile:
                    481: 
                    482: struct
                    483:     >body
                    484:     cell% field interpret/compile-int
                    485:     cell% field interpret/compile-comp
                    486: end-struct interpret/compile-struct
                    487: 
                    488: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    489:     Create immediate swap A, A,
                    490: DOES>
                    491:     abort" executed primary cfa of an interpret/compile: word" ;
                    492: \    state @ IF  cell+  THEN  perform ;
                    493: 
                    494: : interpret/compile? ( xt -- flag )
                    495:     >does-code ['] DOES> >does-code = ;
1.1       pazsan    496: 
                    497: \ \ : ;                                                        24feb93py
                    498: 
                    499: defer :-hook ( sys1 -- sys2 )
                    500: 
                    501: defer ;-hook ( sys2 -- sys1 )
                    502: 
1.16      jwilke    503: 0 Constant defstart
                    504: 
1.14      jwilke    505: [IFDEF] docol,
                    506: : (:noname) ( -- colon-sys )
                    507:     \ common factor of : and :noname
                    508:     docol, ]comp defstart ] :-hook ;
                    509: [ELSE]
1.7       anton     510: : (:noname) ( -- colon-sys )
                    511:     \ common factor of : and :noname
                    512:     docol: cfa, defstart ] :-hook ;
1.14      jwilke    513: [THEN]
1.7       anton     514: 
1.1       pazsan    515: : : ( "name" -- colon-sys ) \ core     colon
1.7       anton     516:     Header (:noname) ;
                    517: 
                    518: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    519:     0 last !
                    520:     cfalign here (:noname) ;
1.1       pazsan    521: 
1.14      jwilke    522: [IFDEF] fini,
                    523: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    524:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    525: [ELSE]
1.1       pazsan    526: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
                    527:     ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
1.14      jwilke    528: [THEN]
1.1       pazsan    529: 
                    530: \ \ Search list handling: reveal words, recursive              23feb93py
                    531: 
                    532: : last?   ( -- false / nfa nfa )
                    533:     last @ ?dup ;
                    534: 
                    535: : (reveal) ( nt wid -- )
1.3       pazsan    536:     wordlist-id dup >r
1.1       pazsan    537:     @ over ( name>link ) ! 
                    538:     r> ! ;
                    539: 
                    540: \ make entry in wordlist-map
                    541: ' (reveal) f83search reveal-method !
                    542: 
                    543: Variable warnings ( -- addr ) \ gforth
                    544: G -1 warnings T !
                    545: 
                    546: : check-shadow  ( addr count wid -- )
1.2       pazsan    547:     \G prints a warning if the string is already present in the wordlist
                    548:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    549:        >stderr
                    550:        ." redefined " name>string 2dup type
                    551:        compare 0<> if
                    552:            ."  with " type
                    553:        else
                    554:            2drop
                    555:        then
                    556:        space space EXIT
                    557:     then
                    558:     2drop 2drop ;
1.1       pazsan    559: 
                    560: : reveal ( -- ) \ gforth
                    561:     last?
                    562:     if \ the last word has a header
                    563:        dup ( name>link ) @ 1 and
                    564:        if \ it is still hidden
                    565:            dup ( name>link ) @ 1 xor           ( nt wid )
                    566:            2dup >r name>string r> check-shadow ( nt wid )
                    567:            dup wordlist-map @ reveal-method perform
                    568:        else
                    569:            drop
                    570:        then
                    571:     then ;
                    572: 
                    573: : rehash  ( wid -- )
                    574:     dup wordlist-map @ rehash-method perform ;
                    575: 
                    576: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10      crook     577: \g Make the current definition visible, enabling it to call itself
1.1       pazsan    578: \g recursively.
                    579:        immediate restrict

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