Annotation of gforth/kernel/comp.fs, revision 1.62

1.1       pazsan      1: \ compiler definitions                                         14sep97jaw
                      2: 
1.54      anton       3: \ Copyright (C) 1995,1996,1997,1998,2000,2003 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
1.55      anton     111:     \G puts down string as longcstring
1.30      anton     112:     dup , here swap chars dup allot move ;
                    113: 
1.1       pazsan    114: : header, ( c-addr u -- ) \ gforth
                    115:     name-too-long?
1.53      anton     116:     dup max-name-length @ max max-name-length !
1.1       pazsan    117:     align here last !
                    118:     current @ 1 or A,  \ link field; before revealing, it contains the
                    119:                        \ tagged reveal-into wordlist
1.30      anton     120:     longstring, cfalign
1.1       pazsan    121:     alias-mask lastflags cset ;
                    122: 
                    123: : input-stream-header ( "name" -- )
                    124:     name name-too-short? header, ;
                    125: 
                    126: : input-stream ( -- )  \ general
                    127:     \G switches back to getting the name from the input stream ;
                    128:     ['] input-stream-header IS (header) ;
                    129: 
                    130: ' input-stream-header IS (header)
                    131: 
1.32      anton     132: 2variable nextname-string
1.1       pazsan    133: 
1.33      pazsan    134: has? OS [IF]
1.1       pazsan    135: : nextname-header ( -- )
1.32      anton     136:     nextname-string 2@ header,
                    137:     nextname-string free-mem-var
1.1       pazsan    138:     input-stream ;
1.33      pazsan    139: [THEN]
1.1       pazsan    140: 
                    141: \ the next name is given in the string
                    142: 
1.33      pazsan    143: has? OS [IF]
1.1       pazsan    144: : nextname ( c-addr u -- ) \ gforth
1.19      anton     145:     \g The next defined word will have the name @var{c-addr u}; the
                    146:     \g defining word will leave the input stream alone.
1.1       pazsan    147:     name-too-long?
1.32      anton     148:     nextname-string free-mem-var
                    149:     save-mem nextname-string 2!
1.1       pazsan    150:     ['] nextname-header IS (header) ;
1.33      pazsan    151: [THEN]
1.1       pazsan    152: 
                    153: : noname-header ( -- )
                    154:     0 last ! cfalign
                    155:     input-stream ;
                    156: 
                    157: : noname ( -- ) \ gforth
1.19      anton     158:     \g The next defined word will be anonymous. The defining word will
                    159:     \g leave the input stream alone. The xt of the defined word will
1.56      anton     160:     \g be given by @code{latestxt}.
1.1       pazsan    161:     ['] noname-header IS (header) ;
                    162: 
1.56      anton     163: : latestxt ( -- xt ) \ gforth
1.15      crook     164:     \G @i{xt} is the execution token of the last word defined.
1.13      crook     165:     \ The main purpose of this word is to get the xt of words defined using noname
1.1       pazsan    166:     lastcfa @ ;
                    167: 
1.56      anton     168: ' latestxt alias lastxt \ gforth-obsolete
                    169: \G old name for @code{latestxt}.
                    170: 
                    171: : latest ( -- nt ) \ gforth
                    172: \G @var{nt} is the name token of the last word defined; it is 0 if the
                    173: \G last word has no name.
                    174:     last @ ;
                    175: 
1.1       pazsan    176: \ \ literals                                                   17dec92py
                    177: 
                    178: : Literal  ( compilation n -- ; run-time -- n ) \ core
1.27      anton     179:     \G Compilation semantics: compile the run-time semantics.@*
                    180:     \G Run-time Semantics: push @i{n}.@*
                    181:     \G Interpretation semantics: undefined.
1.14      jwilke    182: [ [IFDEF] lit, ]
                    183:     lit,
                    184: [ [ELSE] ]
1.27      anton     185:     postpone lit ,
1.14      jwilke    186: [ [THEN] ] ; immediate restrict
1.1       pazsan    187: 
                    188: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14      jwilke    189: [ [IFDEF] alit, ]
                    190:     alit,
                    191: [ [ELSE] ]
                    192:     postpone lit A, 
                    193: [ [THEN] ] ; immediate restrict
1.1       pazsan    194: 
1.8       crook     195: : char   ( '<spaces>ccc' -- c ) \ core
1.15      crook     196:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    197:     \G display code representing the first character of @i{ccc}.
1.1       pazsan    198:     bl word char+ c@ ;
                    199: 
1.8       crook     200: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10      crook     201:     \G Compilation: skip leading spaces. Parse the string
1.15      crook     202:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    203:     \G representing the first character of @i{ccc}.  Interpretation
1.10      crook     204:     \G semantics for this word are undefined.
1.1       pazsan    205:     char postpone Literal ; immediate restrict
                    206: 
                    207: \ \ threading                                                  17mar93py
                    208: 
                    209: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    210:     here
                    211:     dup lastcfa !
                    212:     0 A, 0 ,  code-address! ;
                    213: 
1.14      jwilke    214: [IFUNDEF] compile,
1.34      anton     215: defer compile, ( xt -- )       \ core-ext      compile-comma
                    216: \G  Compile the word represented by the execution token @i{xt}
                    217: \G  into the current definition.
                    218: 
                    219: ' , is compile,
1.14      jwilke    220: [THEN]
1.1       pazsan    221: 
1.40      anton     222: defer basic-block-end ( -- )
                    223: 
1.60      anton     224: :noname ( -- )
                    225:     0 compile-prim1 ;
                    226: is basic-block-end
1.40      anton     227: 
1.36      pazsan    228: has? peephole [IF]
1.40      anton     229: 
                    230: \ dynamic only    
1.49      anton     231: : peephole-compile, ( xt -- )
                    232:     \ compile xt, appending its code to the current dynamic superinstruction
                    233:     here swap , compile-prim1 ;
1.38      anton     234:     
1.35      anton     235: : compile-to-prims, ( xt -- )
                    236:     \G compile xt to use primitives (and their peephole optimization)
                    237:     \G instead of ","-ing the xt.
                    238:     \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39      pazsan    239:     dup >does-code if
                    240:        POSTPONE does-exec , EXIT
1.41      anton     241:        \ dup >body POSTPONE literal POSTPONE call >does-code , EXIT
1.35      anton     242:     then
                    243:     dup >code-address CASE
1.47      anton     244:        docon:   OF >body POSTPONE lit@ , EXIT ENDOF
                    245:        \ docon:   OF >body POSTPONE literal POSTPONE @ EXIT ENDOF
1.42      anton     246:        \ docon is also used by VALUEs, so don't @ at compile time
1.35      anton     247:        docol:   OF >body POSTPONE call , EXIT ENDOF
                    248:        dovar:   OF >body POSTPONE literal EXIT ENDOF
                    249:        douser:  OF >body @ POSTPONE useraddr , EXIT ENDOF
1.42      anton     250:        dodefer: OF >body POSTPONE lit-perform , EXIT ENDOF
1.47      anton     251:        dofield: OF >body @ POSTPONE lit+ , EXIT ENDOF
                    252:        \ dofield: OF >body @ POSTPONE literal POSTPONE + EXIT ENDOF
1.48      anton     253:        \ code words and ;code-defined words (code words could be optimized):
                    254:        dup in-dictionary? IF drop POSTPONE literal POSTPONE execute EXIT THEN
1.35      anton     255:     ENDCASE
1.49      anton     256:     peephole-compile, ;
1.35      anton     257: 
                    258: ' compile-to-prims, IS compile,
1.36      pazsan    259: [ELSE]
                    260: ' , is compile,
                    261: [THEN]
1.34      anton     262: 
1.1       pazsan    263: : !does    ( addr -- ) \ gforth        store-does
1.56      anton     264:     latestxt does-code! ;
1.1       pazsan    265: 
                    266: : (does>)  ( R: addr -- )
1.62    ! anton     267:     r> cfaligned /does-handler + !does ; \ !! no gforth-native
        !           268: 
        !           269: : (does>1)  ( addr r:retaddr -- )
        !           270:     rdrop cfaligned /does-handler + !does ; \ !! no tail-call optimization
1.1       pazsan    271: 
                    272: : dodoes,  ( -- )
                    273:   cfalign here /does-handler allot does-handler! ;
                    274: 
1.61      pazsan    275: : (compile) ( -- ) \ gforth-obsolete: dummy
                    276:     ( r> dup cell+ >r @ compile, ) ;
1.1       pazsan    277: 
                    278: \ \ ticks
                    279: 
                    280: : name>comp ( nt -- w xt ) \ gforth
1.15      crook     281:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    282:     (name>comp)
                    283:     1 = if
                    284:         ['] execute
                    285:     else
                    286:         ['] compile,
                    287:     then ;
                    288: 
                    289: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    290:     (') postpone ALiteral ; immediate restrict
                    291: 
                    292: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
1.15      crook     293:     \g @i{xt} represents @i{name}'s interpretation
                    294:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    295:     \g interpretation semantics.
                    296:     ' postpone ALiteral ; immediate restrict
                    297: 
1.5       anton     298: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
1.15      crook     299:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    300:     (') name>comp ;
                    301: 
                    302: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15      crook     303:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    304:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    305: 
1.18      jwilke    306: : postpone, ( w xt -- ) \ gforth       postpone-comma
1.26      anton     307:     \g Compile the compilation semantics represented by the
                    308:     \g compilation token @i{w xt}.
1.18      jwilke    309:     dup ['] execute =
                    310:     if
                    311:        drop compile,
                    312:     else
1.61      pazsan    313:        swap POSTPONE aliteral compile,
1.18      jwilke    314:     then ;
                    315: 
                    316: : POSTPONE ( "name" -- ) \ core
                    317:     \g Compiles the compilation semantics of @i{name}.
1.48      anton     318:     COMP' postpone, ; immediate
1.18      jwilke    319: 
1.1       pazsan    320: \ \ recurse                                                    17may93jaw
                    321: 
                    322: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10      crook     323:     \g Call the current definition.
1.56      anton     324:     latestxt compile, ; immediate restrict
1.1       pazsan    325: 
                    326: \ \ compiler loop
                    327: 
                    328: : compiler ( c-addr u -- )
                    329:     2dup find-name dup
                    330:     if ( c-addr u nt )
                    331:        nip nip name>comp execute
                    332:     else
                    333:        drop
                    334:        2dup snumber? dup
                    335:        IF
                    336:            0>
                    337:            IF
                    338:                swap postpone Literal
                    339:            THEN
                    340:            postpone Literal
                    341:            2drop
                    342:        ELSE
                    343:            drop compiler-notfound
                    344:        THEN
                    345:     then ;
                    346: 
1.22      crook     347: : [ ( -- ) \  core     left-bracket
1.8       crook     348:     \G Enter interpretation state. Immediate word.
1.1       pazsan    349:     ['] interpreter  IS parser state off ; immediate
                    350: 
                    351: : ] ( -- ) \ core      right-bracket
1.8       crook     352:     \G Enter compilation state.
1.1       pazsan    353:     ['] compiler     IS parser state on  ;
                    354: 
                    355: \ \ Strings                                                    22feb93py
                    356: 
1.44      anton     357: : S, ( addr u -- )
1.45      anton     358:     \ allot string as counted string
1.44      anton     359:     here over char+ allot  place align ;
1.45      anton     360: 
                    361: : mem, ( addr u -- )
                    362:     \ allot the memory block HERE (do alignment yourself)
                    363:     here over allot swap move ;
1.1       pazsan    364: 
1.44      anton     365: : ," ( "string"<"> -- )
                    366:     [char] " parse s, ;
1.1       pazsan    367: 
                    368: \ \ Header states                                              23feb93py
                    369: 
                    370: : cset ( bmask c-addr -- )
1.30      anton     371:     tuck @ or swap ! ; 
1.1       pazsan    372: 
                    373: : creset ( bmask c-addr -- )
1.30      anton     374:     tuck @ swap invert and swap ! ; 
1.1       pazsan    375: 
                    376: : ctoggle ( bmask c-addr -- )
1.30      anton     377:     tuck @ xor swap ! ; 
1.1       pazsan    378: 
                    379: : lastflags ( -- c-addr )
                    380:     \ the address of the flags byte in the last header
                    381:     \ aborts if the last defined word was headerless
1.56      anton     382:     latest dup 0= abort" last word was headerless" cell+ ;
1.1       pazsan    383: 
                    384: : immediate ( -- ) \ core
1.10      crook     385:     \G Make the compilation semantics of a word be to @code{execute}
                    386:     \G the execution semantics.
1.1       pazsan    387:     immediate-mask lastflags cset ;
                    388: 
                    389: : restrict ( -- ) \ gforth
1.10      crook     390:     \G A synonym for @code{compile-only}
1.1       pazsan    391:     restrict-mask lastflags cset ;
1.18      jwilke    392: 
1.1       pazsan    393: ' restrict alias compile-only ( -- ) \ gforth
1.10      crook     394: \G Remove the interpretation semantics of a word.
1.1       pazsan    395: 
                    396: \ \ Create Variable User Constant                              17mar93py
                    397: 
1.15      crook     398: : Alias    ( xt "name" -- ) \ gforth
1.1       pazsan    399:     Header reveal
                    400:     alias-mask lastflags creset
                    401:     dup A, lastcfa ! ;
                    402: 
                    403: doer? :dovar [IF]
                    404: 
                    405: : Create ( "name" -- ) \ core
                    406:     Header reveal dovar: cfa, ;
                    407: [ELSE]
                    408: 
                    409: : Create ( "name" -- ) \ core
                    410:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    411: [THEN]
                    412: 
                    413: : Variable ( "name" -- ) \ core
                    414:     Create 0 , ;
                    415: 
                    416: : AVariable ( "name" -- ) \ gforth
                    417:     Create 0 A, ;
                    418: 
1.22      crook     419: : 2Variable ( "name" -- ) \ double two-variable
1.1       pazsan    420:     create 0 , 0 , ;
                    421: 
1.21      crook     422: : uallot ( n -- ) \ gforth
                    423:     udp @ swap udp +! ;
1.1       pazsan    424: 
                    425: doer? :douser [IF]
                    426: 
                    427: : User ( "name" -- ) \ gforth
                    428:     Header reveal douser: cfa, cell uallot , ;
                    429: 
                    430: : AUser ( "name" -- ) \ gforth
                    431:     User ;
                    432: [ELSE]
                    433: 
                    434: : User Create cell uallot , DOES> @ up @ + ;
                    435: 
                    436: : AUser User ;
                    437: [THEN]
                    438: 
                    439: doer? :docon [IF]
                    440:     : (Constant)  Header reveal docon: cfa, ;
                    441: [ELSE]
                    442:     : (Constant)  Create DOES> @ ;
                    443: [THEN]
                    444: 
                    445: : Constant ( w "name" -- ) \ core
1.15      crook     446:     \G Define a constant @i{name} with value @i{w}.
1.1       pazsan    447:     \G  
1.15      crook     448:     \G @i{name} execution: @i{-- w}
1.1       pazsan    449:     (Constant) , ;
                    450: 
                    451: : AConstant ( addr "name" -- ) \ gforth
                    452:     (Constant) A, ;
                    453: 
                    454: : Value ( w "name" -- ) \ core-ext
                    455:     (Constant) , ;
                    456: 
1.37      jwilke    457: : AValue ( w "name" -- ) \ core-ext
                    458:     (Constant) A, ;
                    459: 
1.22      crook     460: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1       pazsan    461:     Create ( w1 w2 "name" -- )
                    462:         2,
                    463:     DOES> ( -- w1 w2 )
                    464:         2@ ;
                    465:     
                    466: doer? :dofield [IF]
                    467:     : (Field)  Header reveal dofield: cfa, ;
                    468: [ELSE]
                    469:     : (Field)  Create DOES> @ + ;
                    470: [THEN]
1.39      pazsan    471: 
                    472: \ \ interpret/compile:
                    473: 
                    474: struct
                    475:     >body
                    476:     cell% field interpret/compile-int
                    477:     cell% field interpret/compile-comp
                    478: end-struct interpret/compile-struct
                    479: 
                    480: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    481:     Create immediate swap A, A,
                    482: DOES>
                    483:     abort" executed primary cfa of an interpret/compile: word" ;
                    484: \    state @ IF  cell+  THEN  perform ;
                    485: 
1.1       pazsan    486: \ IS Defer What's Defers TO                            24feb93py
                    487: 
                    488: doer? :dodefer [IF]
                    489: 
                    490: : Defer ( "name" -- ) \ gforth
                    491:     \ !! shouldn't it be initialized with abort or something similar?
                    492:     Header Reveal dodefer: cfa,
                    493:     ['] noop A, ;
1.18      jwilke    494: 
1.1       pazsan    495: [ELSE]
                    496: 
                    497: : Defer ( "name" -- ) \ gforth
                    498:     Create ['] noop A,
                    499: DOES> @ execute ;
1.18      jwilke    500: 
1.1       pazsan    501: [THEN]
                    502: 
1.25      anton     503: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    504:     \G Compiles the present contents of the deferred word @i{name}
                    505:     \G into the current definition.  I.e., this produces static
                    506:     \G binding as if @i{name} was not deferred.
1.1       pazsan    507:     ' >body @ compile, ; immediate
1.18      jwilke    508: 
                    509: :noname
                    510:     dodoes, here !does ]
                    511:     defstart :-hook ;
                    512: :noname
                    513:     ;-hook ?struc
                    514:     [ has? xconds [IF] ] exit-like [ [THEN] ]
1.62    ! anton     515:     here 4 cells + postpone aliteral postpone (does>1) dodoes,
1.18      jwilke    516:     defstart :-hook ;
                    517: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    518: 
1.20      anton     519: : <IS> ( "name" xt -- ) \ gforth
                    520:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    521:     ' >body ! ;
                    522: 
                    523: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    524:     \g At run-time, changes the @code{defer}red word @var{name} to
                    525:     \g execute @var{xt}.
1.18      jwilke    526:     ' >body postpone ALiteral postpone ! ; immediate restrict
                    527: 
1.20      anton     528: ' <IS>
1.18      jwilke    529: ' [IS]
                    530: interpret/compile: IS ( xt "name" -- ) \ gforth
1.21      crook     531: \G A combined word made up from @code{<IS>} and @code{[IS]}.
1.18      jwilke    532: 
1.20      anton     533: ' <IS>
                    534: ' [IS]
                    535: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18      jwilke    536: 
                    537: :noname    ' >body @ ;
                    538: :noname    ' >body postpone ALiteral postpone @ ;
1.25      anton     539: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
                    540: \G @i{Xt} is the XT that is currently assigned to @i{name}.
1.18      jwilke    541: 
                    542: : interpret/compile? ( xt -- flag )
                    543:     >does-code ['] DOES> >does-code = ;
1.1       pazsan    544: 
                    545: \ \ : ;                                                        24feb93py
                    546: 
                    547: defer :-hook ( sys1 -- sys2 )
                    548: 
                    549: defer ;-hook ( sys2 -- sys1 )
                    550: 
1.16      jwilke    551: 0 Constant defstart
                    552: 
1.14      jwilke    553: [IFDEF] docol,
                    554: : (:noname) ( -- colon-sys )
                    555:     \ common factor of : and :noname
1.34      anton     556:     docol, ]comp
1.14      jwilke    557: [ELSE]
1.7       anton     558: : (:noname) ( -- colon-sys )
                    559:     \ common factor of : and :noname
1.34      anton     560:     docol: cfa,
1.14      jwilke    561: [THEN]
1.40      anton     562:     defstart ] :-hook ;
1.7       anton     563: 
1.1       pazsan    564: : : ( "name" -- colon-sys ) \ core     colon
1.7       anton     565:     Header (:noname) ;
                    566: 
                    567: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    568:     0 last !
                    569:     cfalign here (:noname) ;
1.1       pazsan    570: 
1.14      jwilke    571: [IFDEF] fini,
                    572: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    573:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    574: [ELSE]
1.1       pazsan    575: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
1.57      pazsan    576:     ;-hook ?struc [compile] exit
                    577:     [ has? peephole [IF] ] finish-code [ [THEN] ]
                    578:     reveal postpone [ ; immediate restrict
1.14      jwilke    579: [THEN]
1.1       pazsan    580: 
                    581: \ \ Search list handling: reveal words, recursive              23feb93py
                    582: 
                    583: : last?   ( -- false / nfa nfa )
1.56      anton     584:     latest ?dup ;
1.1       pazsan    585: 
                    586: : (reveal) ( nt wid -- )
1.3       pazsan    587:     wordlist-id dup >r
1.1       pazsan    588:     @ over ( name>link ) ! 
                    589:     r> ! ;
                    590: 
                    591: \ make entry in wordlist-map
                    592: ' (reveal) f83search reveal-method !
                    593: 
                    594: Variable warnings ( -- addr ) \ gforth
                    595: G -1 warnings T !
                    596: 
                    597: : check-shadow  ( addr count wid -- )
1.2       pazsan    598:     \G prints a warning if the string is already present in the wordlist
                    599:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    600:        >stderr
                    601:        ." redefined " name>string 2dup type
1.43      anton     602:        str= 0= if
1.2       pazsan    603:            ."  with " type
                    604:        else
                    605:            2drop
                    606:        then
                    607:        space space EXIT
                    608:     then
                    609:     2drop 2drop ;
1.1       pazsan    610: 
                    611: : reveal ( -- ) \ gforth
                    612:     last?
                    613:     if \ the last word has a header
                    614:        dup ( name>link ) @ 1 and
                    615:        if \ it is still hidden
                    616:            dup ( name>link ) @ 1 xor           ( nt wid )
                    617:            2dup >r name>string r> check-shadow ( nt wid )
                    618:            dup wordlist-map @ reveal-method perform
                    619:        else
                    620:            drop
                    621:        then
                    622:     then ;
                    623: 
                    624: : rehash  ( wid -- )
                    625:     dup wordlist-map @ rehash-method perform ;
                    626: 
                    627: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10      crook     628: \g Make the current definition visible, enabling it to call itself
1.1       pazsan    629: \g recursively.
                    630:        immediate restrict

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