Annotation of gforth/kernel-ec/comp.fs, revision 1.2

1.1       pazsan      1: \ compiler definitions                                         14sep97jaw
                      2: 
1.2     ! anton       3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012 Free Software Foundation, Inc.
1.1       pazsan      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 3
                     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, see http://www.gnu.org/licenses/.
                     19: 
                     20: \ \ Revisions-Log
                     21: 
                     22: \      put in seperate file                            14sep97jaw      
                     23: 
                     24: \ \ here allot , c, A,                                         17dec92py
                     25: 
                     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
                     36: : allot ( n -- ) \ core
                     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.
                     43:     here +
                     44:     dup 1- usable-dictionary-end forthstart within -8 and throw
                     45:     dp ! ;
                     46: [THEN]
                     47: 
                     48: : c,    ( c -- ) \ core c-comma
                     49:     \G Reserve data space for one char and store @i{c} in the space.
                     50:     here 1 chars allot [ has? flash [IF] ] flashc! [ [ELSE] ] c! [ [THEN] ] ;
                     51: 
                     52: : ,     ( w -- ) \ core comma
                     53:     \G Reserve data space for one cell and store @i{w} in the space.
                     54:     here cell allot [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] ;
                     55: 
                     56: : 2,   ( w1 w2 -- ) \ gforth
                     57:     \G Reserve data space for two cells and store the double @i{w1
                     58:     \G w2} there, @i{w2} first (lower address).
                     59:     here 2 cells allot  [ has? flash [IF] ] tuck flash! cell+ flash!
                     60:        [ [ELSE] ] 2! [ [THEN] ] ;
                     61: 
                     62: \ : aligned ( addr -- addr' ) \ core
                     63: \     [ cell 1- ] Literal + [ -1 cells ] Literal and ;
                     64: 
                     65: : align ( -- ) \ core
                     66:     \G If the data-space pointer is not aligned, reserve enough space to align it.
                     67:     here dup aligned swap ?DO  bl c,  LOOP ;
                     68: 
                     69: : maxalign ( -- ) \ gforth
                     70:     \G Align data-space pointer for all alignment requirements.
                     71:     here dup maxaligned swap
                     72:     ?DO
                     73:        bl c,
                     74:     LOOP ;
                     75: 
                     76: \ the code field is aligned if its body is maxaligned
                     77: ' maxalign Alias cfalign ( -- ) \ gforth
                     78: \G Align data-space pointer for code field requirements (i.e., such
                     79: \G that the corresponding body is maxaligned).
                     80: 
                     81: ' , alias A, ( addr -- ) \ gforth
                     82: 
                     83: ' NOOP ALIAS const
                     84: 
                     85: \ \ Header                                                     23feb93py
                     86: 
                     87: \ input-stream, nextname and noname are quite ugly (passing
                     88: \ information through global variables), but they are useful for dealing
                     89: \ with existing/independent defining words
                     90: 
                     91: : string, ( c-addr u -- ) \ gforth
                     92:     \G puts down string as cstring
                     93:     dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
                     94: [ has? flash [IF] ]
                     95:     bounds ?DO  I c@ c,  LOOP
                     96: [ [ELSE] ]
                     97:     here swap chars dup allot move
                     98: [ [THEN] ] ;
                     99: 
                    100: : longstring, ( c-addr u -- ) \ gforth
                    101:     \G puts down string as longcstring
                    102:     dup , here swap chars dup allot move ;
                    103: 
                    104: [IFDEF] prelude-mask
                    105: variable next-prelude
                    106: 
                    107: : prelude, ( -- )
                    108:     next-prelude @ if
                    109:        align next-prelude @ ,
                    110:     then ;
                    111: [THEN]
                    112: 
                    113: : header, ( c-addr u -- ) \ gforth
                    114:     name-too-long?
                    115:     dup max-name-length @ max max-name-length !
                    116:     [ [IFDEF] prelude-mask ] prelude, [ [THEN] ]
                    117:     align here last !
                    118:     -1 A,
                    119:     string,
                    120:     cfalign ;
                    121: 
                    122: : header ( "name" -- )
                    123:     parse-name name-too-short? header, ;
                    124: 
                    125: : latestxt ( -- xt ) \ gforth
                    126:     \G @i{xt} is the execution token of the last word defined.
                    127:     \ The main purpose of this word is to get the xt of words defined using noname
                    128:     lastcfa @ ;
                    129: 
                    130: : latest ( -- nt ) \ gforth
                    131: \G @var{nt} is the name token of the last word defined; it is 0 if the
                    132: \G last word has no name.
                    133:     last @ ;
                    134: 
                    135: \ \ literals                                                   17dec92py
                    136: 
                    137: : Literal  ( compilation n -- ; run-time -- n ) \ core
                    138:     \G Compilation semantics: compile the run-time semantics.@*
                    139:     \G Run-time Semantics: push @i{n}.@*
                    140:     \G Interpretation semantics: undefined.
                    141: [ [IFDEF] lit, ]
                    142:     lit,
                    143: [ [ELSE] ]
                    144:     postpone lit ,
                    145: [ [THEN] ] ; immediate restrict
                    146: 
                    147: : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
                    148:     \G Compile appropriate code such that, at run-time, @i{w1 w2} are
                    149:     \G placed on the stack. Interpretation semantics are undefined.
                    150:     swap postpone Literal  postpone Literal ; immediate restrict
                    151: 
                    152: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
                    153: [ [IFDEF] alit, ]
                    154:     alit,
                    155: [ [ELSE] ]
                    156:     postpone lit A, 
                    157: [ [THEN] ] ; immediate restrict
                    158: 
                    159: Defer char@ ( addr u -- char addr' u' )
                    160: :noname  over c@ -rot 1 /string ; IS char@
                    161: 
                    162: : char   ( '<spaces>ccc' -- c ) \ core
                    163:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    164:     \G display code representing the first character of @i{ccc}.
                    165:     parse-name char@ 2drop ;
                    166: 
                    167: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
                    168:     \G Compilation: skip leading spaces. Parse the string
                    169:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    170:     \G representing the first character of @i{ccc}.  Interpretation
                    171:     \G semantics for this word are undefined.
                    172:     char postpone Literal ; immediate restrict
                    173: 
                    174: \ \ threading                                                  17mar93py
                    175: 
                    176: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    177:     here
                    178:     dup lastcfa !
                    179:     [ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
                    180:     code-address! ;
                    181: 
                    182: [IFUNDEF] compile,
                    183: defer compile, ( xt -- )       \ core-ext      compile-comma
                    184: \G  Compile the word represented by the execution token @i{xt}
                    185: \G  into the current definition.
                    186: 
                    187: ' , is compile,
                    188: [THEN]
                    189: 
                    190: ' , is compile,
                    191: 
                    192: : !does    ( addr -- ) \ gforth        store-does
                    193:     latestxt does-code! ;
                    194: 
                    195: : (compile) ( -- ) \ gforth-obsolete: dummy
                    196:     true abort" (compile) doesn't work, use POSTPONE instead" ;
                    197: 
                    198: \ \ ticks
                    199: 
                    200: : name>comp ( nt -- w xt ) \ gforth name-to-comp
                    201:     \G @i{w xt} is the compilation token for the word @i{nt}.
                    202:     (name>comp)
                    203:     1 = if
                    204:         ['] execute
                    205:     else
                    206:         ['] compile,
                    207:     then ;
                    208: 
                    209: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    210:     (') postpone ALiteral ; immediate restrict
                    211: 
                    212: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
                    213:     \g @i{xt} represents @i{name}'s interpretation
                    214:     \g semantics. Perform @code{-14 throw} if the word has no
                    215:     \g interpretation semantics.
                    216:     ' postpone ALiteral ; immediate restrict
                    217: 
                    218: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
                    219:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
                    220:     (') name>comp ;
                    221: 
                    222: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
                    223:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
                    224:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    225: 
                    226: : postpone, ( w xt -- ) \ gforth       postpone-comma
                    227:     \g Compile the compilation semantics represented by the
                    228:     \g compilation token @i{w xt}.
                    229:     dup ['] execute =
                    230:     if
                    231:        drop compile,
                    232:     else
                    233:        swap POSTPONE aliteral compile,
                    234:     then ;
                    235: 
                    236: : POSTPONE ( "name" -- ) \ core
                    237:     \g Compiles the compilation semantics of @i{name}.
                    238:     COMP' postpone, ; immediate
                    239: 
                    240: \ \ recurse                                                    17may93jaw
                    241: 
                    242: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
                    243:     \g Call the current definition.
                    244:     latestxt compile, ; immediate restrict
                    245: 
                    246: \ \ compiler loop
                    247: 
                    248: : compiler1 ( c-addr u -- ... xt )
                    249:     2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
                    250:     if ( c-addr u nt )
                    251:        nip nip name>comp
                    252:     else
                    253:        drop
                    254:        2dup 2>r snumber? dup
                    255:        IF
                    256:            0>
                    257:            IF
                    258:                ['] 2literal
                    259:            ELSE
                    260:                ['] literal
                    261:            THEN
                    262:            2rdrop
                    263:        ELSE
                    264:            drop 2r> compiler-notfound1
                    265:        THEN
                    266:     then ;
                    267: 
                    268: : [ ( -- ) \  core     left-bracket
                    269:     \G Enter interpretation state. Immediate word.
                    270:     ['] interpreter1  IS parser1 state off ; immediate
                    271: 
                    272: : ] ( -- ) \ core      right-bracket
                    273:     \G Enter compilation state.
                    274:     ['] compiler1     IS parser1 state on  ;
                    275: 
                    276: \ \ Strings                                                    22feb93py
                    277: 
                    278: : S, ( addr u -- )
                    279:     \ allot string as counted string
                    280: [ has? flash [IF] ]
                    281:     dup c, bounds ?DO  I c@ c,  LOOP
                    282: [ [ELSE] ]
                    283:     here over char+ allot  place align
                    284: [ [THEN] ] ;
                    285: 
                    286: : mem, ( addr u -- )
                    287:     \ allot the memory block HERE (do alignment yourself)
                    288: [ has? flash [IF] ]
                    289:     bounds ?DO  I c@ c,  LOOP
                    290: [ [ELSE] ]
                    291:     here over allot swap move
                    292: [ [THEN] ] ;
                    293: 
                    294: : ," ( "string"<"> -- )
                    295:     [char] " parse s, ;
                    296: 
                    297: \ \ Header states                                              23feb93py
                    298: 
                    299: \ problematic only for big endian machines
                    300: 
                    301: : cset ( bmask c-addr -- )
                    302:     tuck c@ or swap c! ; 
                    303: 
                    304: : creset ( bmask c-addr -- )
                    305:     tuck c@ swap invert and swap c! ; 
                    306: 
                    307: : ctoggle ( bmask c-addr -- )
                    308:     tuck c@ xor swap c! ; 
                    309: 
                    310: : lastflags ( -- c-addr )
                    311:     \ the address of the flags byte in the last header
                    312:     \ aborts if the last defined word was headerless
                    313:     latest dup 0= abort" last word was headerless" cell+ ;
                    314: 
                    315: : immediate ( -- ) \ core
                    316:     \G Make the compilation semantics of a word be to @code{execute}
                    317:     \G the execution semantics.
                    318:     immediate-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
                    319: 
                    320: : restrict ( -- ) \ gforth
                    321:     \G A synonym for @code{compile-only}
                    322:     restrict-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
                    323: 
                    324: ' restrict alias compile-only ( -- ) \ gforth
                    325: \G Remove the interpretation semantics of a word.
                    326: 
                    327: \ \ Create Variable User Constant                              17mar93py
                    328: 
                    329: : Alias    ( xt "name" -- ) \ gforth
                    330:     Header reveal
                    331:     alias-mask lastflags creset
                    332:     dup A, lastcfa ! ;
                    333: 
                    334: doer? :dovar [IF]
                    335: 
                    336: : Create ( "name" -- ) \ core
                    337:     Header reveal dovar: cfa, ;
                    338: [ELSE]
                    339: 
                    340: : Create ( "name" -- ) \ core
                    341:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    342: [THEN]
                    343: 
                    344: : buffer: ( u "name" -- ) \ core ext
                    345:     Create allot ;
                    346: 
                    347: has? flash [IF]
                    348:     : (variable) dpp @ normal-dp = IF  Create dpp @
                    349:        ELSE  normal-dp @ Constant dpp @ ram  THEN ;
                    350: : Variable ( "name" -- ) \ core
                    351:     (Variable) 0 , dpp ! ;
                    352: 
                    353: : 2Variable ( "name" -- ) \ double two-variable
                    354:     (Variable) 0 , 0 , dpp ! ;
                    355: [ELSE]
                    356: : Variable ( "name" -- ) \ core
                    357:     Create 0 , ;
                    358: 
                    359: : 2Variable ( "name" -- ) \ double two-variable
                    360:     Create 0 , 0 , ;
                    361: [THEN]
                    362: 
                    363: has? no-userspace 0= [IF]
                    364: : uallot ( n -- ) \ gforth
                    365:     udp @ swap udp +! ;
                    366: 
                    367: doer? :douser [IF]
                    368: 
                    369: : User ( "name" -- ) \ gforth
                    370:     Header reveal douser: cfa, cell uallot , ;
                    371: [ELSE]
                    372: 
                    373: : User Create cell uallot , DOES> @ up @ + ;
                    374: [THEN]
                    375: [THEN]
                    376: 
                    377: doer? :docon [IF]
                    378:     : (Constant)  Header reveal docon: cfa, ;
                    379: [ELSE]
                    380:     : (Constant)  Create DOES> @ ;
                    381: [THEN]
                    382: 
                    383: doer? :dovalue [IF]
                    384:     : (Value)  Header reveal dovalue: cfa, ;
                    385: [ELSE]
                    386:     has? rom [IF]
                    387:        : (Value)  Create DOES> @ @ ;
                    388:     [ELSE]
                    389:        : (Value)  Create DOES> @ ;
                    390:     [THEN]
                    391: [THEN]
                    392: 
                    393: : Constant ( w "name" -- ) \ core
                    394:     \G Define a constant @i{name} with value @i{w}.
                    395:     \G  
                    396:     \G @i{name} execution: @i{-- w}
                    397:     (Constant) , ;
                    398: 
                    399: : AConstant ( addr "name" -- ) \ gforth
                    400:     (Constant) A, ;
                    401: 
                    402: has? flash [IF]
                    403: : Value ( w "name" -- ) \ core-ext
                    404:     (Value) dpp @ >r here cell allot >r
                    405:     ram here >r , r> r> flash! r> dpp ! ;
                    406: 
                    407: ' Value alias AValue
                    408: [ELSE]
                    409: : Value ( w "name" -- ) \ core-ext
                    410:     (Value) , ;
                    411: [THEN]
                    412: 
                    413: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
                    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: 
                    425: \ \ interpret/compile:
                    426: 
                    427: struct
                    428:     >body
                    429:     cell% field interpret/compile-int
                    430:     cell% field interpret/compile-comp
                    431: end-struct interpret/compile-struct
                    432: 
                    433: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    434:     Create immediate swap A, A,
                    435: DOES>
                    436:     abort" executed primary cfa of an interpret/compile: word" ;
                    437: \    state @ IF  cell+  THEN  perform ;
                    438: 
                    439: \ IS Defer What's Defers TO                            24feb93py
                    440: 
                    441: defer defer-default ( -- )
                    442: ' abort is defer-default
                    443: \ default action for deferred words (overridden by a warning later)
                    444:     
                    445: doer? :dodefer [IF]
                    446: 
                    447: : Defer ( "name" -- ) \ gforth
                    448: \G Define a deferred word @i{name}; its execution semantics can be
                    449: \G set with @code{defer!} or @code{is} (and they have to, before first
                    450: \G executing @i{name}.
                    451:     Header Reveal dodefer: cfa,
                    452:     [ has? rom [IF] ] here >r cell allot
                    453:     dpp @ ram here r> flash! ['] defer-default A, dpp !
                    454:     [ [ELSE] ] ['] defer-default A, [ [THEN] ] ;
                    455: 
                    456: [ELSE]
                    457: 
                    458:     has? rom [IF]
                    459:        : Defer ( "name" -- ) \ gforth
                    460:            Create here >r cell allot
                    461:            dpp @ ram here r> flash! ['] defer-default A, dpp !
                    462:          DOES> @ @ execute ;
                    463:     [ELSE]
                    464:        : Defer ( "name" -- ) \ gforth
                    465:            Create ['] defer-default A,
                    466:          DOES> @ execute ;
                    467:     [THEN]
                    468: [THEN]
                    469: 
                    470: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
                    471: \G @i{xt} represents the word currently associated with the deferred
                    472: \G word @i{xt-deferred}.
                    473:     >body @ [ has? rom [IF] ] @ [ [THEN] ] ;
                    474: 
                    475: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    476:     \G Compiles the present contents of the deferred word @i{name}
                    477:     \G into the current definition.  I.e., this produces static
                    478:     \G binding as if @i{name} was not deferred.
                    479:     ' defer@ compile, ; immediate
                    480: 
                    481: : does>-like ( xt -- )
                    482:     \ xt ( addr -- ) is !does or !;abi-code etc, addr is the address
                    483:     \ that should be stored right after the code address.
                    484:     >r ;-hook ?struc
                    485:     [ has? xconds [IF] ] exit-like [ [THEN] ]
                    486:     here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
                    487:     postpone aliteral r> compile, [compile] exit
                    488:     [ has? peephole [IF] ] finish-code [ [THEN] ]
                    489:     defstart ;
                    490: 
                    491: :noname
                    492:     here !does ]
                    493:     defstart :-hook ;
                    494: :noname
                    495:     ['] !does does>-like :-hook ;
                    496: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    497: 
                    498: : defer! ( xt xt-deferred -- ) \ gforth  defer-store
                    499: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
                    500:     >body [ has? rom [IF] ] @ [ [THEN] ] ! ;
                    501:     
                    502: : <IS> ( "name" xt -- ) \ gforth
                    503:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    504:     ' defer! ;
                    505: 
                    506: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    507:     \g At run-time, changes the @code{defer}red word @var{name} to
                    508:     \g execute @var{xt}.
                    509:     ' postpone ALiteral postpone defer! ; immediate restrict
                    510: 
                    511: ' <IS>
                    512: ' [IS]
                    513: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
                    514: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    515: \G Its compilation semantics parses at compile time.
                    516: 
                    517: ' <IS>
                    518: ' [IS]
                    519: interpret/compile: TO ( w "name" -- ) \ core-ext
                    520: 
                    521: : interpret/compile? ( xt -- flag )
                    522:     >does-code ['] DOES> >does-code = ;
                    523: 
                    524: \ \ : ;                                                        24feb93py
                    525: 
                    526: defer :-hook ( sys1 -- sys2 )
                    527: 
                    528: defer ;-hook ( sys2 -- sys1 )
                    529: 
                    530: 0 Constant defstart
                    531: 
                    532: [IFDEF] docol,
                    533: : (:noname) ( -- colon-sys )
                    534:     \ common factor of : and :noname
                    535:     docol, ]comp
                    536: [ELSE]
                    537: : (:noname) ( -- colon-sys )
                    538:     \ common factor of : and :noname
                    539:     docol: cfa,
                    540: [THEN]
                    541:     defstart ] :-hook ;
                    542: 
                    543: : : ( "name" -- colon-sys ) \ core     colon
                    544:     Header (:noname) ;
                    545: 
                    546: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    547:     0 last !
                    548:     cfalign here (:noname) ;
                    549: 
                    550: [IFDEF] fini,
                    551: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    552:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    553: [ELSE]
                    554: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
                    555:     ;-hook ?struc [compile] exit
                    556:     [ has? peephole [IF] ] finish-code [ [THEN] ]
                    557:     reveal postpone [ ; immediate restrict
                    558: [THEN]
                    559: 
                    560: \ \ Search list handling: reveal words, recursive              23feb93py
                    561: 
                    562: : last?   ( -- false / nfa nfa )
                    563:     latest ?dup ;
                    564: 
                    565: Variable warnings ( -- addr ) \ gforth
                    566: G -1 warnings T !
                    567: 
                    568: : reveal ( -- ) \ gforth
                    569:     last?
                    570:     if \ the last word has a header
                    571:        dup ( name>link ) @ -1 =
                    572:        if \ it is still hidden
                    573:            forth-wordlist dup >r @ over
                    574:            [ has? flash [IF] ] flash! [ [ELSE] ] ! [  [THEN] ] r> !
                    575:        else
                    576:            drop
                    577:        then
                    578:     then ;
                    579: 
                    580: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
                    581: \g Make the current definition visible, enabling it to call itself
                    582: \g recursively.
                    583:        immediate restrict

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