Annotation of gforth/kernel/comp.fs, revision 1.74

1.1       pazsan      1: \ compiler definitions                                         14sep97jaw
                      2: 
1.74    ! anton       3: \ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005 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: 
1.72      anton     188: : 2Literal ( compilation w1 w2 -- ; run-time  -- w1 w2 ) \ double two-literal
                    189:     \G Compile appropriate code such that, at run-time, @i{w1 w2} are
                    190:     \G placed on the stack. Interpretation semantics are undefined.
                    191:     swap postpone Literal  postpone Literal ; immediate restrict
                    192: 
1.1       pazsan    193: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
1.14      jwilke    194: [ [IFDEF] alit, ]
                    195:     alit,
                    196: [ [ELSE] ]
                    197:     postpone lit A, 
                    198: [ [THEN] ] ; immediate restrict
1.1       pazsan    199: 
1.70      pazsan    200: Defer char@ ( addr u -- char addr' u' )
                    201: :noname  over c@ -rot 1 /string ; IS char@
                    202: 
1.8       crook     203: : char   ( '<spaces>ccc' -- c ) \ core
1.15      crook     204:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
                    205:     \G display code representing the first character of @i{ccc}.
1.70      pazsan    206:     bl word count char@ 2drop ;
1.1       pazsan    207: 
1.8       crook     208: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
1.10      crook     209:     \G Compilation: skip leading spaces. Parse the string
1.15      crook     210:     \G @i{ccc}. Run-time: return @i{c}, the display code
                    211:     \G representing the first character of @i{ccc}.  Interpretation
1.10      crook     212:     \G semantics for this word are undefined.
1.1       pazsan    213:     char postpone Literal ; immediate restrict
                    214: 
                    215: \ \ threading                                                  17mar93py
                    216: 
                    217: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    218:     here
                    219:     dup lastcfa !
                    220:     0 A, 0 ,  code-address! ;
                    221: 
1.14      jwilke    222: [IFUNDEF] compile,
1.34      anton     223: defer compile, ( xt -- )       \ core-ext      compile-comma
                    224: \G  Compile the word represented by the execution token @i{xt}
                    225: \G  into the current definition.
                    226: 
                    227: ' , is compile,
1.14      jwilke    228: [THEN]
1.1       pazsan    229: 
1.40      anton     230: defer basic-block-end ( -- )
                    231: 
1.60      anton     232: :noname ( -- )
                    233:     0 compile-prim1 ;
                    234: is basic-block-end
1.40      anton     235: 
1.36      pazsan    236: has? peephole [IF]
1.40      anton     237: 
                    238: \ dynamic only    
1.49      anton     239: : peephole-compile, ( xt -- )
                    240:     \ compile xt, appending its code to the current dynamic superinstruction
                    241:     here swap , compile-prim1 ;
1.38      anton     242:     
1.35      anton     243: : compile-to-prims, ( xt -- )
                    244:     \G compile xt to use primitives (and their peephole optimization)
                    245:     \G instead of ","-ing the xt.
                    246:     \ !! all POSTPONEs here postpone primitives; this can be optimized
1.39      pazsan    247:     dup >does-code if
1.66      anton     248:        ['] does-exec peephole-compile, , EXIT
                    249:        \ dup >body POSTPONE literal ['] call peephole-compile, >does-code , EXIT
1.35      anton     250:     then
                    251:     dup >code-address CASE
1.66      anton     252:        docon:   OF >body ['] lit@ peephole-compile, , EXIT ENDOF
                    253:        \ docon:   OF >body POSTPONE literal ['] @ peephole-compile, EXIT ENDOF
1.42      anton     254:        \ docon is also used by VALUEs, so don't @ at compile time
1.66      anton     255:        docol:   OF >body ['] call peephole-compile, , EXIT ENDOF
                    256:        dovar:   OF >body ['] lit peephole-compile, , EXIT ENDOF
                    257:        douser:  OF >body @ ['] useraddr peephole-compile, , EXIT ENDOF
                    258:        dodefer: OF >body ['] lit-perform peephole-compile, , EXIT ENDOF
                    259:        dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF
                    260:        \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF
1.48      anton     261:        \ code words and ;code-defined words (code words could be optimized):
1.66      anton     262:        dup in-dictionary? IF drop POSTPONE literal ['] execute peephole-compile, EXIT THEN
1.35      anton     263:     ENDCASE
1.49      anton     264:     peephole-compile, ;
1.35      anton     265: 
                    266: ' compile-to-prims, IS compile,
1.36      pazsan    267: [ELSE]
                    268: ' , is compile,
                    269: [THEN]
1.34      anton     270: 
1.1       pazsan    271: : !does    ( addr -- ) \ gforth        store-does
1.56      anton     272:     latestxt does-code! ;
1.1       pazsan    273: 
1.65      anton     274: \ !! unused, but ifdefed/gosted in some places
1.1       pazsan    275: : (does>)  ( R: addr -- )
1.62      anton     276:     r> cfaligned /does-handler + !does ; \ !! no gforth-native
1.1       pazsan    277: 
1.64      anton     278: : (does>2)  ( addr -- )
                    279:     cfaligned /does-handler + !does ;
                    280: 
1.1       pazsan    281: : dodoes,  ( -- )
                    282:   cfalign here /does-handler allot does-handler! ;
                    283: 
1.61      pazsan    284: : (compile) ( -- ) \ gforth-obsolete: dummy
1.63      anton     285:     true abort" (compile) doesn't work, use POSTPONE instead" ;
1.1       pazsan    286: 
                    287: \ \ ticks
                    288: 
                    289: : name>comp ( nt -- w xt ) \ gforth
1.15      crook     290:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    291:     (name>comp)
                    292:     1 = if
                    293:         ['] execute
                    294:     else
                    295:         ['] compile,
                    296:     then ;
                    297: 
                    298: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
                    299:     (') postpone ALiteral ; immediate restrict
                    300: 
                    301: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
1.15      crook     302:     \g @i{xt} represents @i{name}'s interpretation
                    303:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    304:     \g interpretation semantics.
                    305:     ' postpone ALiteral ; immediate restrict
                    306: 
1.5       anton     307: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
1.15      crook     308:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    309:     (') name>comp ;
                    310: 
                    311: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
1.15      crook     312:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
1.1       pazsan    313:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    314: 
1.18      jwilke    315: : postpone, ( w xt -- ) \ gforth       postpone-comma
1.26      anton     316:     \g Compile the compilation semantics represented by the
                    317:     \g compilation token @i{w xt}.
1.18      jwilke    318:     dup ['] execute =
                    319:     if
                    320:        drop compile,
                    321:     else
1.61      pazsan    322:        swap POSTPONE aliteral compile,
1.18      jwilke    323:     then ;
                    324: 
                    325: : POSTPONE ( "name" -- ) \ core
                    326:     \g Compiles the compilation semantics of @i{name}.
1.48      anton     327:     COMP' postpone, ; immediate
1.18      jwilke    328: 
1.1       pazsan    329: \ \ recurse                                                    17may93jaw
                    330: 
                    331: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
1.10      crook     332:     \g Call the current definition.
1.56      anton     333:     latestxt compile, ; immediate restrict
1.1       pazsan    334: 
                    335: \ \ compiler loop
                    336: 
1.72      anton     337: : compiler1 ( c-addr u -- ... xt )
1.1       pazsan    338:     2dup find-name dup
                    339:     if ( c-addr u nt )
1.72      anton     340:        nip nip name>comp
1.1       pazsan    341:     else
                    342:        drop
1.72      anton     343:        2dup 2>r snumber? dup
1.1       pazsan    344:        IF
                    345:            0>
                    346:            IF
1.72      anton     347:                ['] 2literal
                    348:            ELSE
                    349:                ['] literal
1.1       pazsan    350:            THEN
1.72      anton     351:            2rdrop
1.1       pazsan    352:        ELSE
1.72      anton     353:            drop 2r> compiler-notfound1
1.1       pazsan    354:        THEN
                    355:     then ;
                    356: 
1.22      crook     357: : [ ( -- ) \  core     left-bracket
1.8       crook     358:     \G Enter interpretation state. Immediate word.
1.72      anton     359:     ['] interpreter1  IS parser1 state off ; immediate
1.1       pazsan    360: 
                    361: : ] ( -- ) \ core      right-bracket
1.8       crook     362:     \G Enter compilation state.
1.72      anton     363:     ['] compiler1     IS parser1 state on  ;
1.1       pazsan    364: 
                    365: \ \ Strings                                                    22feb93py
                    366: 
1.44      anton     367: : S, ( addr u -- )
1.45      anton     368:     \ allot string as counted string
1.44      anton     369:     here over char+ allot  place align ;
1.45      anton     370: 
                    371: : mem, ( addr u -- )
                    372:     \ allot the memory block HERE (do alignment yourself)
                    373:     here over allot swap move ;
1.1       pazsan    374: 
1.44      anton     375: : ," ( "string"<"> -- )
                    376:     [char] " parse s, ;
1.1       pazsan    377: 
                    378: \ \ Header states                                              23feb93py
                    379: 
                    380: : cset ( bmask c-addr -- )
1.30      anton     381:     tuck @ or swap ! ; 
1.1       pazsan    382: 
                    383: : creset ( bmask c-addr -- )
1.30      anton     384:     tuck @ swap invert and swap ! ; 
1.1       pazsan    385: 
                    386: : ctoggle ( bmask c-addr -- )
1.30      anton     387:     tuck @ xor swap ! ; 
1.1       pazsan    388: 
                    389: : lastflags ( -- c-addr )
                    390:     \ the address of the flags byte in the last header
                    391:     \ aborts if the last defined word was headerless
1.56      anton     392:     latest dup 0= abort" last word was headerless" cell+ ;
1.1       pazsan    393: 
                    394: : immediate ( -- ) \ core
1.10      crook     395:     \G Make the compilation semantics of a word be to @code{execute}
                    396:     \G the execution semantics.
1.1       pazsan    397:     immediate-mask lastflags cset ;
                    398: 
                    399: : restrict ( -- ) \ gforth
1.10      crook     400:     \G A synonym for @code{compile-only}
1.1       pazsan    401:     restrict-mask lastflags cset ;
1.18      jwilke    402: 
1.1       pazsan    403: ' restrict alias compile-only ( -- ) \ gforth
1.10      crook     404: \G Remove the interpretation semantics of a word.
1.1       pazsan    405: 
                    406: \ \ Create Variable User Constant                              17mar93py
                    407: 
1.15      crook     408: : Alias    ( xt "name" -- ) \ gforth
1.1       pazsan    409:     Header reveal
                    410:     alias-mask lastflags creset
                    411:     dup A, lastcfa ! ;
                    412: 
                    413: doer? :dovar [IF]
                    414: 
                    415: : Create ( "name" -- ) \ core
                    416:     Header reveal dovar: cfa, ;
                    417: [ELSE]
                    418: 
                    419: : Create ( "name" -- ) \ core
                    420:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
                    421: [THEN]
                    422: 
                    423: : Variable ( "name" -- ) \ core
                    424:     Create 0 , ;
                    425: 
                    426: : AVariable ( "name" -- ) \ gforth
                    427:     Create 0 A, ;
                    428: 
1.22      crook     429: : 2Variable ( "name" -- ) \ double two-variable
1.1       pazsan    430:     create 0 , 0 , ;
                    431: 
1.21      crook     432: : uallot ( n -- ) \ gforth
                    433:     udp @ swap udp +! ;
1.1       pazsan    434: 
                    435: doer? :douser [IF]
                    436: 
                    437: : User ( "name" -- ) \ gforth
                    438:     Header reveal douser: cfa, cell uallot , ;
                    439: 
                    440: : AUser ( "name" -- ) \ gforth
                    441:     User ;
                    442: [ELSE]
                    443: 
                    444: : User Create cell uallot , DOES> @ up @ + ;
                    445: 
                    446: : AUser User ;
                    447: [THEN]
                    448: 
                    449: doer? :docon [IF]
                    450:     : (Constant)  Header reveal docon: cfa, ;
                    451: [ELSE]
                    452:     : (Constant)  Create DOES> @ ;
                    453: [THEN]
                    454: 
                    455: : Constant ( w "name" -- ) \ core
1.15      crook     456:     \G Define a constant @i{name} with value @i{w}.
1.1       pazsan    457:     \G  
1.15      crook     458:     \G @i{name} execution: @i{-- w}
1.1       pazsan    459:     (Constant) , ;
                    460: 
                    461: : AConstant ( addr "name" -- ) \ gforth
                    462:     (Constant) A, ;
                    463: 
                    464: : Value ( w "name" -- ) \ core-ext
                    465:     (Constant) , ;
                    466: 
1.37      jwilke    467: : AValue ( w "name" -- ) \ core-ext
                    468:     (Constant) A, ;
                    469: 
1.22      crook     470: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
1.1       pazsan    471:     Create ( w1 w2 "name" -- )
                    472:         2,
                    473:     DOES> ( -- w1 w2 )
                    474:         2@ ;
                    475:     
                    476: doer? :dofield [IF]
                    477:     : (Field)  Header reveal dofield: cfa, ;
                    478: [ELSE]
                    479:     : (Field)  Create DOES> @ + ;
                    480: [THEN]
1.39      pazsan    481: 
                    482: \ \ interpret/compile:
                    483: 
                    484: struct
                    485:     >body
                    486:     cell% field interpret/compile-int
                    487:     cell% field interpret/compile-comp
                    488: end-struct interpret/compile-struct
                    489: 
                    490: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
                    491:     Create immediate swap A, A,
                    492: DOES>
                    493:     abort" executed primary cfa of an interpret/compile: word" ;
                    494: \    state @ IF  cell+  THEN  perform ;
                    495: 
1.1       pazsan    496: \ IS Defer What's Defers TO                            24feb93py
                    497: 
1.68      anton     498: defer defer-default ( -- )
1.69      anton     499: ' abort is defer-default
                    500: \ default action for deferred words (overridden by a warning later)
1.67      anton     501:     
1.1       pazsan    502: doer? :dodefer [IF]
                    503: 
                    504: : Defer ( "name" -- ) \ gforth
1.67      anton     505: \G Define a deferred word @i{name}; its execution semantics can be
                    506: \G set with @code{defer!} or @code{is} (and they have to, before first
                    507: \G executing @i{name}.
1.1       pazsan    508:     Header Reveal dodefer: cfa,
1.67      anton     509:     ['] defer-default A, ;
1.18      jwilke    510: 
1.1       pazsan    511: [ELSE]
                    512: 
                    513: : Defer ( "name" -- ) \ gforth
1.67      anton     514:     Create ['] defer-default A,
1.1       pazsan    515: DOES> @ execute ;
1.18      jwilke    516: 
1.1       pazsan    517: [THEN]
                    518: 
1.67      anton     519: : defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
                    520: \G @i{xt} represents the word currently associated with the deferred
                    521: \G word @i{xt-deferred}.
                    522:     >body @ ;
                    523: 
1.25      anton     524: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
                    525:     \G Compiles the present contents of the deferred word @i{name}
                    526:     \G into the current definition.  I.e., this produces static
                    527:     \G binding as if @i{name} was not deferred.
1.67      anton     528:     ' defer@ compile, ; immediate
1.18      jwilke    529: 
                    530: :noname
                    531:     dodoes, here !does ]
                    532:     defstart :-hook ;
                    533: :noname
                    534:     ;-hook ?struc
                    535:     [ has? xconds [IF] ] exit-like [ [THEN] ]
1.64      anton     536:     here 5 cells + postpone aliteral postpone (does>2) [compile] exit
                    537:     finish-code dodoes,
1.18      jwilke    538:     defstart :-hook ;
                    539: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
                    540: 
1.73      anton     541: : defer! ( xt xt-deferred -- ) \ gforth  defer-store
1.67      anton     542: \G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
                    543:     >body ! ;
                    544:     
1.20      anton     545: : <IS> ( "name" xt -- ) \ gforth
                    546:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
1.67      anton     547:     ' defer! ;
1.20      anton     548: 
                    549: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
                    550:     \g At run-time, changes the @code{defer}red word @var{name} to
                    551:     \g execute @var{xt}.
1.67      anton     552:     ' postpone ALiteral postpone defer! ; immediate restrict
1.18      jwilke    553: 
1.20      anton     554: ' <IS>
1.18      jwilke    555: ' [IS]
1.67      anton     556: interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
                    557: \G Changes the @code{defer}red word @var{name} to execute @var{xt}.
                    558: \G Its compilation semantics parses at compile time.
1.18      jwilke    559: 
1.20      anton     560: ' <IS>
                    561: ' [IS]
                    562: interpret/compile: TO ( w "name" -- ) \ core-ext
1.18      jwilke    563: 
                    564: : interpret/compile? ( xt -- flag )
                    565:     >does-code ['] DOES> >does-code = ;
1.1       pazsan    566: 
                    567: \ \ : ;                                                        24feb93py
                    568: 
                    569: defer :-hook ( sys1 -- sys2 )
                    570: 
                    571: defer ;-hook ( sys2 -- sys1 )
                    572: 
1.16      jwilke    573: 0 Constant defstart
                    574: 
1.14      jwilke    575: [IFDEF] docol,
                    576: : (:noname) ( -- colon-sys )
                    577:     \ common factor of : and :noname
1.34      anton     578:     docol, ]comp
1.14      jwilke    579: [ELSE]
1.7       anton     580: : (:noname) ( -- colon-sys )
                    581:     \ common factor of : and :noname
1.34      anton     582:     docol: cfa,
1.14      jwilke    583: [THEN]
1.40      anton     584:     defstart ] :-hook ;
1.7       anton     585: 
1.1       pazsan    586: : : ( "name" -- colon-sys ) \ core     colon
1.7       anton     587:     Header (:noname) ;
                    588: 
                    589: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    590:     0 last !
                    591:     cfalign here (:noname) ;
1.1       pazsan    592: 
1.14      jwilke    593: [IFDEF] fini,
                    594: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
                    595:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
                    596: [ELSE]
1.1       pazsan    597: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
1.57      pazsan    598:     ;-hook ?struc [compile] exit
                    599:     [ has? peephole [IF] ] finish-code [ [THEN] ]
                    600:     reveal postpone [ ; immediate restrict
1.14      jwilke    601: [THEN]
1.1       pazsan    602: 
                    603: \ \ Search list handling: reveal words, recursive              23feb93py
                    604: 
                    605: : last?   ( -- false / nfa nfa )
1.56      anton     606:     latest ?dup ;
1.1       pazsan    607: 
                    608: : (reveal) ( nt wid -- )
1.3       pazsan    609:     wordlist-id dup >r
1.1       pazsan    610:     @ over ( name>link ) ! 
                    611:     r> ! ;
                    612: 
                    613: \ make entry in wordlist-map
                    614: ' (reveal) f83search reveal-method !
                    615: 
                    616: Variable warnings ( -- addr ) \ gforth
                    617: G -1 warnings T !
                    618: 
                    619: : check-shadow  ( addr count wid -- )
1.2       pazsan    620:     \G prints a warning if the string is already present in the wordlist
                    621:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    622:        >stderr
                    623:        ." redefined " name>string 2dup type
1.43      anton     624:        str= 0= if
1.2       pazsan    625:            ."  with " type
                    626:        else
                    627:            2drop
                    628:        then
                    629:        space space EXIT
                    630:     then
                    631:     2drop 2drop ;
1.1       pazsan    632: 
                    633: : reveal ( -- ) \ gforth
                    634:     last?
                    635:     if \ the last word has a header
                    636:        dup ( name>link ) @ 1 and
                    637:        if \ it is still hidden
                    638:            dup ( name>link ) @ 1 xor           ( nt wid )
                    639:            2dup >r name>string r> check-shadow ( nt wid )
                    640:            dup wordlist-map @ reveal-method perform
                    641:        else
                    642:            drop
                    643:        then
                    644:     then ;
                    645: 
                    646: : rehash  ( wid -- )
                    647:     dup wordlist-map @ rehash-method perform ;
                    648: 
                    649: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
1.10      crook     650: \g Make the current definition visible, enabling it to call itself
1.1       pazsan    651: \g recursively.
                    652:        immediate restrict

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