Annotation of gforth/kernel/comp.fs, revision 1.54

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
                    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?
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
                    160:     \g be given by @code{lastxt}.
1.1       pazsan    161:     ['] noname-header IS (header) ;
                    162: 
                    163: : lastxt ( -- 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: 
                    168: \ \ literals                                                   17dec92py
                    169: 
                    170: : Literal  ( compilation n -- ; run-time -- n ) \ core
1.27      anton     171:     \G Compilation semantics: compile the run-time semantics.@*
                    172:     \G Run-time Semantics: push @i{n}.@*
                    173:     \G Interpretation semantics: undefined.
1.14      jwilke    174: [ [IFDEF] lit, ]
                    175:     lit,
                    176: [ [ELSE] ]
1.27      anton     177:     postpone lit ,
1.14      jwilke    178: [ [THEN] ] ; immediate restrict
1.1       pazsan    179: 
                    180: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14      jwilke    181: [ [IFDEF] alit, ]
                    182:     alit,
                    183: [ [ELSE] ]
                    184:     postpone lit A, 
                    185: [ [THEN] ] ; immediate restrict
1.1       pazsan    186: 
1.8       crook     187: : char   ( '<spaces>ccc' -- c ) \ core
1.15      crook     188:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    189:     \G display code representing the first character of @i{ccc}.
1.1       pazsan    190:     bl word char+ c@ ;
                    191: 
1.8       crook     192: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10      crook     193:     \G Compilation: skip leading spaces. Parse the string
1.15      crook     194:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    195:     \G representing the first character of @i{ccc}.  Interpretation
1.10      crook     196:     \G semantics for this word are undefined.
1.1       pazsan    197:     char postpone Literal ; immediate restrict
                    198: 
                    199: \ \ threading                                                  17mar93py
                    200: 
                    201: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    202:     here
                    203:     dup lastcfa !
                    204:     0 A, 0 ,  code-address! ;
                    205: 
1.14      jwilke    206: [IFUNDEF] compile,
1.34      anton     207: defer compile, ( xt -- )       \ core-ext      compile-comma
                    208: \G  Compile the word represented by the execution token @i{xt}
                    209: \G  into the current definition.
                    210: 
                    211: ' , is compile,
1.14      jwilke    212: [THEN]
1.1       pazsan    213: 
1.40      anton     214: defer basic-block-end ( -- )
                    215: 
1.48      anton     216: :noname ( -- )
1.40      anton     217:     0 last-compiled ! ;
1.48      anton     218: is basic-block-end
1.40      anton     219: 
1.36      pazsan    220: has? peephole [IF]
1.40      anton     221: 
                    222: \ dynamic only    
1.49      anton     223: : peephole-compile, ( xt -- )
                    224:     \ compile xt, appending its code to the current dynamic superinstruction
                    225:     here swap , compile-prim1 ;
1.38      anton     226:     
1.40      anton     227: \ static only
1.38      anton     228: \  : peephole-compile, ( xt -- )
                    229: \      \ compile xt, possibly combining it with the previous compiled xt
                    230: \      \ into a superinstruction (static superinstructions)
                    231: \      last-compiled @ ?dup if
                    232: \      @ over peeptable peephole-opt ?dup if
                    233: \          last-compiled @ ! drop EXIT
                    234: \      then
                    235: \      then
                    236: \      here last-compiled !
                    237: \      dyn-compile, ;
1.34      anton     238: 
1.49      anton     239: \ combine greedy static with dynamic
                    240: \  : dyn-compile! ( xt -- )
                    241: \      \ compile xt, appending its code to the current dynamic superinstruction
                    242: \      last-compiled-here @ tuck ! compile-prim1 ;
1.40      anton     243: 
1.49      anton     244: \  :noname ( -- )
                    245: \      last-compiled @ if
                    246: \      last-compiled @ dyn-compile!
                    247: \      0 last-compiled !
                    248: \      then ;
                    249: \  is basic-block-end
1.40      anton     250: 
1.49      anton     251: \  : peephole-compile, ( xt -- )
                    252: \      \ compile xt, possibly combining it with the previous compiled xt
                    253: \      \ into a superinstruction (static superinstructions)
                    254: \      last-compiled @ ?dup if
                    255: \      over peeptable peephole-opt ?dup if ( xt comb-xt )
                    256: \          last-compiled ! drop EXIT
                    257: \      then ( xt )
                    258: \      last-compiled @ dyn-compile!
                    259: \      then ( xt )
                    260: \      last-compiled !
                    261: \      here last-compiled-here ! 0 , ;
1.42      anton     262: 
1.35      anton     263: : compile-to-prims, ( xt -- )
                    264:     \G compile xt to use primitives (and their peephole optimization)
                    265:     \G instead of ","-ing the xt.
                    266:     \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39      pazsan    267:     dup >does-code if
                    268:        POSTPONE does-exec , EXIT
1.41      anton     269:        \ dup >body POSTPONE literal POSTPONE call >does-code , EXIT
1.35      anton     270:     then
                    271:     dup >code-address CASE
1.47      anton     272:        docon:   OF >body POSTPONE lit@ , EXIT ENDOF
                    273:        \ docon:   OF >body POSTPONE literal POSTPONE @ EXIT ENDOF
1.42      anton     274:        \ docon is also used by VALUEs, so don't @ at compile time
1.35      anton     275:        docol:   OF >body POSTPONE call , EXIT ENDOF
                    276:        dovar:   OF >body POSTPONE literal EXIT ENDOF
                    277:        douser:  OF >body @ POSTPONE useraddr , EXIT ENDOF
1.42      anton     278:        dodefer: OF >body POSTPONE lit-perform , EXIT ENDOF
1.47      anton     279:        dofield: OF >body @ POSTPONE lit+ , EXIT ENDOF
                    280:        \ dofield: OF >body @ POSTPONE literal POSTPONE + EXIT ENDOF
1.48      anton     281:        \ code words and ;code-defined words (code words could be optimized):
                    282:        dup in-dictionary? IF drop POSTPONE literal POSTPONE execute EXIT THEN
1.35      anton     283:     ENDCASE
1.49      anton     284:     peephole-compile, ;
1.35      anton     285: 
                    286: ' compile-to-prims, IS compile,
1.36      pazsan    287: [ELSE]
                    288: ' , is compile,
                    289: [THEN]
1.34      anton     290: 
1.1       pazsan    291: : !does    ( addr -- ) \ gforth        store-does
                    292:     lastxt does-code! ;
                    293: 
                    294: : (does>)  ( R: addr -- )
                    295:     r> cfaligned /does-handler + !does ;
                    296: 
                    297: : dodoes,  ( -- )
                    298:   cfalign here /does-handler allot does-handler! ;
                    299: 
                    300: : (compile) ( -- ) \ gforth
                    301:     r> dup cell+ >r @ compile, ;
                    302: 
                    303: \ \ ticks
                    304: 
                    305: : name>comp ( nt -- w xt ) \ gforth
1.15      crook     306:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    307:     (name>comp)
                    308:     1 = if
                    309:         ['] execute
                    310:     else
                    311:         ['] compile,
                    312:     then ;
                    313: 
                    314: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    315:     (') postpone ALiteral ; immediate restrict
                    316: 
                    317: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
1.15      crook     318:     \g @i{xt} represents @i{name}'s interpretation
                    319:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    320:     \g interpretation semantics.
                    321:     ' postpone ALiteral ; immediate restrict
                    322: 
1.5       anton     323: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
1.15      crook     324:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    325:     (') name>comp ;
                    326: 
                    327: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15      crook     328:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    329:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    330: 
1.18      jwilke    331: : postpone, ( w xt -- ) \ gforth       postpone-comma
1.26      anton     332:     \g Compile the compilation semantics represented by the
                    333:     \g compilation token @i{w xt}.
1.18      jwilke    334:     dup ['] execute =
                    335:     if
                    336:        drop compile,
                    337:     else
                    338:        dup ['] compile, =
                    339:        if
                    340:            drop POSTPONE (compile) a,
                    341:        else
                    342:            swap POSTPONE aliteral compile,
                    343:        then
                    344:     then ;
                    345: 
                    346: : POSTPONE ( "name" -- ) \ core
                    347:     \g Compiles the compilation semantics of @i{name}.
1.48      anton     348:     COMP' postpone, ; immediate
1.18      jwilke    349: 
1.1       pazsan    350: \ \ recurse                                                    17may93jaw
                    351: 
                    352: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10      crook     353:     \g Call the current definition.
1.1       pazsan    354:     lastxt compile, ; immediate restrict
                    355: 
                    356: \ \ compiler loop
                    357: 
                    358: : compiler ( c-addr u -- )
                    359:     2dup find-name dup
                    360:     if ( c-addr u nt )
                    361:        nip nip name>comp execute
                    362:     else
                    363:        drop
                    364:        2dup snumber? dup
                    365:        IF
                    366:            0>
                    367:            IF
                    368:                swap postpone Literal
                    369:            THEN
                    370:            postpone Literal
                    371:            2drop
                    372:        ELSE
                    373:            drop compiler-notfound
                    374:        THEN
                    375:     then ;
                    376: 
1.22      crook     377: : [ ( -- ) \  core     left-bracket
1.8       crook     378:     \G Enter interpretation state. Immediate word.
1.1       pazsan    379:     ['] interpreter  IS parser state off ; immediate
                    380: 
                    381: : ] ( -- ) \ core      right-bracket
1.8       crook     382:     \G Enter compilation state.
1.1       pazsan    383:     ['] compiler     IS parser state on  ;
                    384: 
                    385: \ \ Strings                                                    22feb93py
                    386: 
1.44      anton     387: : S, ( addr u -- )
1.45      anton     388:     \ allot string as counted string
1.44      anton     389:     here over char+ allot  place align ;
1.45      anton     390: 
                    391: : mem, ( addr u -- )
                    392:     \ allot the memory block HERE (do alignment yourself)
                    393:     here over allot swap move ;
1.1       pazsan    394: 
1.44      anton     395: : ," ( "string"<"> -- )
                    396:     [char] " parse s, ;
1.1       pazsan    397: 
                    398: \ \ Header states                                              23feb93py
                    399: 
                    400: : cset ( bmask c-addr -- )
1.30      anton     401:     tuck @ or swap ! ; 
1.1       pazsan    402: 
                    403: : creset ( bmask c-addr -- )
1.30      anton     404:     tuck @ swap invert and swap ! ; 
1.1       pazsan    405: 
                    406: : ctoggle ( bmask c-addr -- )
1.30      anton     407:     tuck @ xor swap ! ; 
1.1       pazsan    408: 
                    409: : lastflags ( -- c-addr )
                    410:     \ the address of the flags byte in the last header
                    411:     \ aborts if the last defined word was headerless
                    412:     last @ dup 0= abort" last word was headerless" cell+ ;
                    413: 
                    414: : immediate ( -- ) \ core
1.10      crook     415:     \G Make the compilation semantics of a word be to @code{execute}
                    416:     \G the execution semantics.
1.1       pazsan    417:     immediate-mask lastflags cset ;
                    418: 
                    419: : restrict ( -- ) \ gforth
1.10      crook     420:     \G A synonym for @code{compile-only}
1.1       pazsan    421:     restrict-mask lastflags cset ;
1.18      jwilke    422: 
1.1       pazsan    423: ' restrict alias compile-only ( -- ) \ gforth
1.10      crook     424: \G Remove the interpretation semantics of a word.
1.1       pazsan    425: 
                    426: \ \ Create Variable User Constant                              17mar93py
                    427: 
1.15      crook     428: : Alias    ( xt "name" -- ) \ gforth
1.1       pazsan    429:     Header reveal
                    430:     alias-mask lastflags creset
                    431:     dup A, lastcfa ! ;
                    432: 
                    433: doer? :dovar [IF]
                    434: 
                    435: : Create ( "name" -- ) \ core
                    436:     Header reveal dovar: cfa, ;
                    437: [ELSE]
                    438: 
                    439: : Create ( "name" -- ) \ core
                    440:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    441: [THEN]
                    442: 
                    443: : Variable ( "name" -- ) \ core
                    444:     Create 0 , ;
                    445: 
                    446: : AVariable ( "name" -- ) \ gforth
                    447:     Create 0 A, ;
                    448: 
1.22      crook     449: : 2Variable ( "name" -- ) \ double two-variable
1.1       pazsan    450:     create 0 , 0 , ;
                    451: 
1.21      crook     452: : uallot ( n -- ) \ gforth
                    453:     udp @ swap udp +! ;
1.1       pazsan    454: 
                    455: doer? :douser [IF]
                    456: 
                    457: : User ( "name" -- ) \ gforth
                    458:     Header reveal douser: cfa, cell uallot , ;
                    459: 
                    460: : AUser ( "name" -- ) \ gforth
                    461:     User ;
                    462: [ELSE]
                    463: 
                    464: : User Create cell uallot , DOES> @ up @ + ;
                    465: 
                    466: : AUser User ;
                    467: [THEN]
                    468: 
                    469: doer? :docon [IF]
                    470:     : (Constant)  Header reveal docon: cfa, ;
                    471: [ELSE]
                    472:     : (Constant)  Create DOES> @ ;
                    473: [THEN]
                    474: 
                    475: : Constant ( w "name" -- ) \ core
1.15      crook     476:     \G Define a constant @i{name} with value @i{w}.
1.1       pazsan    477:     \G  
1.15      crook     478:     \G @i{name} execution: @i{-- w}
1.1       pazsan    479:     (Constant) , ;
                    480: 
                    481: : AConstant ( addr "name" -- ) \ gforth
                    482:     (Constant) A, ;
                    483: 
                    484: : Value ( w "name" -- ) \ core-ext
                    485:     (Constant) , ;
                    486: 
1.37      jwilke    487: : AValue ( w "name" -- ) \ core-ext
                    488:     (Constant) A, ;
                    489: 
1.22      crook     490: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1       pazsan    491:     Create ( w1 w2 "name" -- )
                    492:         2,
                    493:     DOES> ( -- w1 w2 )
                    494:         2@ ;
                    495:     
                    496: doer? :dofield [IF]
                    497:     : (Field)  Header reveal dofield: cfa, ;
                    498: [ELSE]
                    499:     : (Field)  Create DOES> @ + ;
                    500: [THEN]
1.39      pazsan    501: 
                    502: \ \ interpret/compile:
                    503: 
                    504: struct
                    505:     >body
                    506:     cell% field interpret/compile-int
                    507:     cell% field interpret/compile-comp
                    508: end-struct interpret/compile-struct
                    509: 
                    510: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    511:     Create immediate swap A, A,
                    512: DOES>
                    513:     abort" executed primary cfa of an interpret/compile: word" ;
                    514: \    state @ IF  cell+  THEN  perform ;
                    515: 
1.1       pazsan    516: \ IS Defer What's Defers TO                            24feb93py
                    517: 
                    518: doer? :dodefer [IF]
                    519: 
                    520: : Defer ( "name" -- ) \ gforth
                    521:     \ !! shouldn't it be initialized with abort or something similar?
                    522:     Header Reveal dodefer: cfa,
                    523:     ['] noop A, ;
1.18      jwilke    524: 
1.1       pazsan    525: [ELSE]
                    526: 
                    527: : Defer ( "name" -- ) \ gforth
                    528:     Create ['] noop A,
                    529: DOES> @ execute ;
1.18      jwilke    530: 
1.1       pazsan    531: [THEN]
                    532: 
1.25      anton     533: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    534:     \G Compiles the present contents of the deferred word @i{name}
                    535:     \G into the current definition.  I.e., this produces static
                    536:     \G binding as if @i{name} was not deferred.
1.1       pazsan    537:     ' >body @ compile, ; immediate
1.18      jwilke    538: 
                    539: :noname
                    540:     dodoes, here !does ]
                    541:     defstart :-hook ;
                    542: :noname
                    543:     ;-hook ?struc
                    544:     [ has? xconds [IF] ] exit-like [ [THEN] ]
                    545:     postpone (does>) dodoes,
                    546:     defstart :-hook ;
                    547: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    548: 
1.20      anton     549: : <IS> ( "name" xt -- ) \ gforth
                    550:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    551:     ' >body ! ;
                    552: 
                    553: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    554:     \g At run-time, changes the @code{defer}red word @var{name} to
                    555:     \g execute @var{xt}.
1.18      jwilke    556:     ' >body postpone ALiteral postpone ! ; immediate restrict
                    557: 
1.20      anton     558: ' <IS>
1.18      jwilke    559: ' [IS]
                    560: interpret/compile: IS ( xt "name" -- ) \ gforth
1.21      crook     561: \G A combined word made up from @code{<IS>} and @code{[IS]}.
1.18      jwilke    562: 
1.20      anton     563: ' <IS>
                    564: ' [IS]
                    565: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18      jwilke    566: 
                    567: :noname    ' >body @ ;
                    568: :noname    ' >body postpone ALiteral postpone @ ;
1.25      anton     569: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
                    570: \G @i{Xt} is the XT that is currently assigned to @i{name}.
1.18      jwilke    571: 
                    572: : interpret/compile? ( xt -- flag )
                    573:     >does-code ['] DOES> >does-code = ;
1.1       pazsan    574: 
                    575: \ \ : ;                                                        24feb93py
                    576: 
                    577: defer :-hook ( sys1 -- sys2 )
                    578: 
                    579: defer ;-hook ( sys2 -- sys1 )
                    580: 
1.16      jwilke    581: 0 Constant defstart
                    582: 
1.14      jwilke    583: [IFDEF] docol,
                    584: : (:noname) ( -- colon-sys )
                    585:     \ common factor of : and :noname
1.34      anton     586:     docol, ]comp
1.14      jwilke    587: [ELSE]
1.7       anton     588: : (:noname) ( -- colon-sys )
                    589:     \ common factor of : and :noname
1.34      anton     590:     docol: cfa,
1.14      jwilke    591: [THEN]
1.40      anton     592:     defstart ] :-hook ;
1.7       anton     593: 
1.1       pazsan    594: : : ( "name" -- colon-sys ) \ core     colon
1.7       anton     595:     Header (:noname) ;
                    596: 
                    597: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    598:     0 last !
                    599:     cfalign here (:noname) ;
1.1       pazsan    600: 
1.14      jwilke    601: [IFDEF] fini,
                    602: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    603:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    604: [ELSE]
1.1       pazsan    605: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
1.50      anton     606:     ;-hook ?struc [compile] exit finish-code reveal postpone [ ; immediate restrict
1.14      jwilke    607: [THEN]
1.1       pazsan    608: 
                    609: \ \ Search list handling: reveal words, recursive              23feb93py
                    610: 
                    611: : last?   ( -- false / nfa nfa )
                    612:     last @ ?dup ;
                    613: 
                    614: : (reveal) ( nt wid -- )
1.3       pazsan    615:     wordlist-id dup >r
1.1       pazsan    616:     @ over ( name>link ) ! 
                    617:     r> ! ;
                    618: 
                    619: \ make entry in wordlist-map
                    620: ' (reveal) f83search reveal-method !
                    621: 
                    622: Variable warnings ( -- addr ) \ gforth
                    623: G -1 warnings T !
                    624: 
                    625: : check-shadow  ( addr count wid -- )
1.2       pazsan    626:     \G prints a warning if the string is already present in the wordlist
                    627:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    628:        >stderr
                    629:        ." redefined " name>string 2dup type
1.43      anton     630:        str= 0= if
1.2       pazsan    631:            ."  with " type
                    632:        else
                    633:            2drop
                    634:        then
                    635:        space space EXIT
                    636:     then
                    637:     2drop 2drop ;
1.1       pazsan    638: 
                    639: : reveal ( -- ) \ gforth
                    640:     last?
                    641:     if \ the last word has a header
                    642:        dup ( name>link ) @ 1 and
                    643:        if \ it is still hidden
                    644:            dup ( name>link ) @ 1 xor           ( nt wid )
                    645:            2dup >r name>string r> check-shadow ( nt wid )
                    646:            dup wordlist-map @ reveal-method perform
                    647:        else
                    648:            drop
                    649:        then
                    650:     then ;
                    651: 
                    652: : rehash  ( wid -- )
                    653:     dup wordlist-map @ rehash-method perform ;
                    654: 
                    655: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10      crook     656: \g Make the current definition visible, enabling it to call itself
1.1       pazsan    657: \g recursively.
                    658:        immediate restrict

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