Annotation of gforth/kernel.fs, revision 1.13

1.1       pazsan      1: \ kernel.fs    GForth kernel                        17dec92py
                      2: 
                      3: \ Copyright (C) 1995 Free Software Foundation, Inc.
                      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
                     19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     20: 
                     21: \ Idea and implementation: Bernd Paysan (py)
                     22: 
                     23: HEX
                     24: 
                     25: \ labels for some code addresses
                     26: 
                     27: : docon: ( -- addr )   \ gforth
1.3       pazsan     28:     \G the code address of a @code{CONSTANT}
1.1       pazsan     29:     ['] bl >code-address ;
                     30: 
                     31: : docol: ( -- addr )   \ gforth
1.3       pazsan     32:     \G the code address of a colon definition
1.1       pazsan     33:     ['] docon: >code-address ;
                     34: 
                     35: : dovar: ( -- addr )   \ gforth
1.3       pazsan     36:     \G the code address of a @code{CREATE}d word
1.1       pazsan     37:     ['] udp >code-address ;
                     38: 
                     39: : douser: ( -- addr )  \ gforth
1.3       pazsan     40:     \G the code address of a @code{USER} variable
1.1       pazsan     41:     ['] s0 >code-address ;
                     42: 
                     43: : dodefer: ( -- addr ) \ gforth
1.3       pazsan     44:     \G the code address of a @code{defer}ed word
1.1       pazsan     45:     ['] source >code-address ;
                     46: 
                     47: : dofield: ( -- addr ) \ gforth
1.3       pazsan     48:     \G the code address of a @code{field}
1.1       pazsan     49:     ['] reveal-method >code-address ;
                     50: 
                     51: NIL AConstant NIL \ gforth
                     52: 
1.13    ! pazsan     53: \ Aliases
        !            54: 
        !            55: ' i Alias r@
        !            56: 
1.1       pazsan     57: \ Bit string manipulation                              06oct92py
                     58: 
                     59: \ Create bits  80 c, 40 c, 20 c, 10 c, 8 c, 4 c, 2 c, 1 c,
                     60: \ DOES> ( n -- )  + c@ ;
                     61: 
                     62: \ : >bit  ( addr n -- c-addr mask )  8 /mod rot + swap bits ;
                     63: \ : +bit  ( addr n -- )  >bit over c@ or swap c! ;
                     64: 
                     65: \ : relinfo ( -- addr )  forthstart dup @ + !!bug!! ;
                     66: \ : >rel  ( addr -- n )  forthstart - ;
                     67: \ : relon ( addr -- )  relinfo swap >rel cell / +bit ;
                     68: 
                     69: \ here allot , c, A,                                   17dec92py
                     70: 
                     71: : dp   ( -- addr ) \ gforth
                     72:     dpp @ ;
                     73: : here  ( -- here ) \ core
                     74:     dp @ ;
                     75: : allot ( n -- ) \ core
                     76:     dp +! ;
                     77: : c,    ( c -- ) \ core
                     78:     here 1 chars allot c! ;
                     79: : ,     ( x -- ) \ core
                     80:     here cell allot  ! ;
                     81: : 2,   ( w1 w2 -- ) \ gforth
                     82:     here 2 cells allot 2! ;
                     83: 
                     84: \ : aligned ( addr -- addr' ) \ core
                     85: \     [ cell 1- ] Literal + [ -1 cells ] Literal and ;
                     86: : align ( -- ) \ core
                     87:     here dup aligned swap ?DO  bl c,  LOOP ;
                     88: 
                     89: \ : faligned ( addr -- f-addr ) \ float
                     90: \     [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
                     91: 
                     92: : falign ( -- ) \ float
                     93:     here dup faligned swap
                     94:     ?DO
                     95:        bl c,
                     96:     LOOP ;
                     97: 
                     98: \ !! this is machine-dependent, but works on all but the strangest machines
                     99: ' faligned Alias maxaligned ( addr1 -- addr2 ) \ gforth
                    100: ' falign Alias maxalign ( -- ) \ gforth
                    101: 
                    102: \ !! machine-dependent and won't work if "0 >body" <> "0 >body maxaligned"
                    103: ' maxaligned Alias cfaligned ( addr1 -- addr2 ) \ gforth
                    104: \ the code field is aligned if its body is maxaligned
                    105: ' maxalign Alias cfalign ( -- ) \ gforth
                    106: 
                    107: : chars ( n1 -- n2 ) \ core
                    108: ; immediate
                    109: 
                    110: 
                    111: \ : A!    ( addr1 addr2 -- ) \ gforth
                    112: \    dup relon ! ;
                    113: \ : A,    ( addr -- ) \ gforth
                    114: \    here cell allot A! ;
                    115: ' ! alias A! ( addr1 addr2 -- ) \ gforth
                    116: ' , alias A, ( addr -- ) \ gforth 
                    117: 
                    118: 
                    119: \ on off                                               23feb93py
                    120: 
                    121: : on  ( addr -- ) \ gforth
                    122:     true  swap ! ;
                    123: : off ( addr -- ) \ gforth
                    124:     false swap ! ;
                    125: 
                    126: \ dabs roll                                           17may93jaw
                    127: 
                    128: : dabs ( d1 -- d2 ) \ double
                    129:     dup 0< IF dnegate THEN ;
                    130: 
                    131: : roll  ( x0 x1 .. xn n -- x1 .. xn x0 ) \ core-ext
                    132:   dup 1+ pick >r
                    133:   cells sp@ cell+ dup cell+ rot move drop r> ;
                    134: 
                    135: \ name> found                                          17dec92py
                    136: 
                    137: $80 constant alias-mask \ set when the word is not an alias!
                    138: $40 constant immediate-mask
                    139: $20 constant restrict-mask
                    140: 
                    141: : ((name>))  ( nfa -- cfa )
                    142:     name>string +  cfaligned ;
                    143: 
                    144: : (name>x) ( nfa -- cfa b )
                    145:     \ cfa is an intermediate cfa and b is the flags byte of nfa
                    146:     dup ((name>))
                    147:     swap cell+ c@ dup alias-mask and 0=
                    148:     IF
                    149:        swap @ swap
                    150:     THEN ;
                    151: 
                    152: \ place bounds                                         13feb93py
                    153: 
                    154: : place  ( addr len to -- ) \ gforth
                    155:     over >r  rot over 1+  r> move c! ;
                    156: : bounds ( beg count -- end beg ) \ gforth
                    157:     over + swap ;
                    158: 
                    159: \ input stream primitives                              23feb93py
                    160: 
                    161: : tib ( -- c-addr ) \ core-ext
                    162:     \ obsolescent
                    163:     >tib @ ;
                    164: Defer source ( -- addr count ) \ core
                    165: \ used by dodefer:, must be defer
                    166: : (source) ( -- addr count )
                    167:     tib #tib @ ;
                    168: ' (source) IS source
                    169: 
                    170: \ (word)                                               22feb93py
                    171: 
                    172: : scan   ( addr1 n1 char -- addr2 n2 ) \ gforth
                    173:     \ skip all characters not equal to char
                    174:     >r
                    175:     BEGIN
                    176:        dup
                    177:     WHILE
                    178:        over c@ r@ <>
                    179:     WHILE
                    180:        1 /string
                    181:     REPEAT  THEN
                    182:     rdrop ;
                    183: : skip   ( addr1 n1 char -- addr2 n2 ) \ gforth
                    184:     \ skip all characters equal to char
                    185:     >r
                    186:     BEGIN
                    187:        dup
                    188:     WHILE
                    189:        over c@ r@  =
                    190:     WHILE
                    191:        1 /string
                    192:     REPEAT  THEN
                    193:     rdrop ;
                    194: 
                    195: : (word) ( addr1 n1 char -- addr2 n2 )
                    196:   dup >r skip 2dup r> scan  nip - ;
                    197: 
                    198: \ (word) should fold white spaces
                    199: \ this is what (parse-white) does
                    200: 
                    201: \ word parse                                           23feb93py
                    202: 
                    203: : parse-word  ( char -- addr len ) \ gforth
                    204:   source 2dup >r >r >in @ over min /string
                    205:   rot dup bl = IF  drop (parse-white)  ELSE  (word)  THEN
                    206:   2dup + r> - 1+ r> min >in ! ;
                    207: : word   ( char -- addr ) \ core
                    208:   parse-word here place  bl here count + c!  here ;
                    209: 
                    210: : parse    ( char -- addr len ) \ core-ext
                    211:   >r  source  >in @ over min /string  over  swap r>  scan >r
                    212:   over - dup r> IF 1+ THEN  >in +! ;
                    213: 
                    214: \ name                                                 13feb93py
                    215: 
                    216: : capitalize ( addr len -- addr len ) \ gforth
                    217:   2dup chars chars bounds
                    218:   ?DO  I c@ toupper I c! 1 chars +LOOP ;
                    219: : (name) ( -- c-addr count )
                    220:     source 2dup >r >r >in @ /string (parse-white)
                    221:     2dup + r> - 1+ r> min >in ! ;
                    222: \    name count ;
                    223: 
                    224: : name-too-short? ( c-addr u -- c-addr u )
                    225:     dup 0= -&16 and throw ;
                    226: 
                    227: : name-too-long? ( c-addr u -- c-addr u )
                    228:     dup $1F u> -&19 and throw ;
                    229: 
                    230: \ Literal                                              17dec92py
                    231: 
                    232: : Literal  ( compilation n -- ; run-time -- n ) \ core
                    233:     postpone lit  , ; immediate restrict
                    234: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
                    235:     postpone lit A, ; immediate restrict
                    236: 
                    237: : char   ( 'char' -- n ) \ core
                    238:     bl word char+ c@ ;
                    239: : [char] ( compilation 'char' -- ; run-time -- n )
                    240:     char postpone Literal ; immediate restrict
                    241: 
                    242: : (compile) ( -- ) \ gforth
                    243:     r> dup cell+ >r @ compile, ;
                    244: 
1.5       anton     245: : postpone, ( w xt -- )
                    246:     \g Compiles the compilation semantics represented by @var{w xt}.
                    247:     dup ['] execute =
                    248:     if
                    249:        drop compile,
                    250:     else
                    251:        dup ['] compile, =
                    252:        if
                    253:            drop POSTPONE (compile) compile,
                    254:        else
                    255:            swap POSTPONE aliteral compile,
                    256:        then
                    257:     then ;
                    258: 
                    259: : POSTPONE ( "name" -- ) \ core
                    260:     \g Compiles the compilation semantics of @var{name}.
                    261:     COMP' postpone, ; immediate restrict
1.1       pazsan    262: 
1.2       anton     263: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
1.1       pazsan    264:     Create immediate swap A, A,
                    265: DOES>
                    266:     abort" executed primary cfa of an interpret/compile: word" ;
                    267: \    state @ IF  cell+  THEN  perform ;
                    268: 
                    269: \ Use (compile) for the old behavior of compile!
                    270: 
                    271: \ digit?                                               17dec92py
                    272: 
                    273: : digit?   ( char -- digit true/ false ) \ gforth
                    274:   base @ $100 =
                    275:   IF
                    276:     true EXIT
                    277:   THEN
                    278:   toupper [char] 0 - dup 9 u> IF
                    279:     [ 'A '9 1 + -  ] literal -
                    280:     dup 9 u<= IF
                    281:       drop false EXIT
                    282:     THEN
                    283:   THEN
                    284:   dup base @ u>= IF
                    285:     drop false EXIT
                    286:   THEN
                    287:   true ;
                    288: 
                    289: : accumulate ( +d0 addr digit - +d1 addr )
                    290:   swap >r swap  base @  um* drop rot  base @  um* d+ r> ;
                    291: 
                    292: : >number ( d addr count -- d addr count ) \ core
                    293:     0
                    294:     ?DO
                    295:        count digit?
                    296:     WHILE
                    297:        accumulate
                    298:     LOOP
                    299:         0
                    300:     ELSE
                    301:        1- I' I -
                    302:        UNLOOP
                    303:     THEN ;
                    304: 
                    305: \ number? number                                       23feb93py
                    306: 
                    307: Create bases   10 ,   2 ,   A , 100 ,
1.3       pazsan    308: \              16     2    10   character
1.1       pazsan    309: \ !! this saving and restoring base is an abomination! - anton
                    310: : getbase ( addr u -- addr' u' )
                    311:     over c@ [char] $ - dup 4 u<
                    312:     IF
                    313:        cells bases + @ base ! 1 /string
                    314:     ELSE
                    315:        drop
                    316:     THEN ;
                    317: : s>number ( addr len -- d )
                    318:     base @ >r  dpl on
                    319:     over c@ '- =  dup >r
                    320:     IF
                    321:        1 /string
                    322:     THEN
                    323:     getbase  dpl on  0 0 2swap
                    324:     BEGIN
                    325:        dup >r >number dup
                    326:     WHILE
                    327:        dup r> -
                    328:     WHILE
                    329:        dup dpl ! over c@ [char] . =
                    330:     WHILE
                    331:        1 /string
                    332:     REPEAT  THEN
                    333:         2drop rdrop dpl off
                    334:     ELSE
                    335:        2drop rdrop r>
                    336:        IF
                    337:            dnegate
                    338:        THEN
                    339:     THEN
                    340:     r> base ! ;
                    341: 
                    342: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
                    343:     s>number dpl @ 0=
                    344:     IF
                    345:        2drop false  EXIT
                    346:     THEN
                    347:     dpl @ dup 0> 0= IF
                    348:        nip
                    349:     THEN ;
                    350: : number? ( string -- string 0 / n -1 / d 0> )
                    351:     dup >r count snumber? dup if
                    352:        rdrop
                    353:     else
                    354:        r> swap
                    355:     then ;
                    356: : s>d ( n -- d ) \ core                s-to-d
                    357:     dup 0< ;
                    358: : number ( string -- d )
                    359:     number? ?dup 0= abort" ?"  0<
                    360:     IF
                    361:        s>d
                    362:     THEN ;
                    363: 
                    364: \ space spaces ud/mod                                  21mar93py
                    365: decimal
                    366: Create spaces ( u -- ) \ core
                    367: bl 80 times \ times from target compiler! 11may93jaw
                    368: DOES>   ( u -- )
                    369:     swap
                    370:     0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
                    371: Create backspaces
                    372: 08 80 times \ times from target compiler! 11may93jaw
                    373: DOES>   ( u -- )
                    374:     swap
                    375:     0 max 0 ?DO  I' I - &80 min 2dup type  +LOOP  drop ;
                    376: hex
                    377: : space ( -- ) \ core
                    378:     1 spaces ;
                    379: 
                    380: : ud/mod ( ud1 u2 -- urem udquot ) \ gforth
                    381:     >r 0 r@ um/mod r> swap >r
                    382:     um/mod r> ;
                    383: 
                    384: : pad    ( -- addr ) \ core-ext
                    385:   here [ $20 8 2* cells + 2 + cell+ ] Literal + aligned ;
                    386: 
                    387: \ hold <# #> sign # #s                                 25jan92py
                    388: 
                    389: : hold    ( char -- ) \ core
                    390:     pad cell - -1 chars over +! @ c! ;
                    391: 
                    392: : <# ( -- ) \ core     less-number-sign
                    393:     pad cell - dup ! ;
                    394: 
                    395: : #>      ( xd -- addr u ) \ core      number-sign-greater
                    396:     2drop pad cell - dup @ tuck - ;
                    397: 
                    398: : sign    ( n -- ) \ core
                    399:     0< IF  [char] - hold  THEN ;
                    400: 
                    401: : #       ( ud1 -- ud2 ) \ core                number-sign
                    402:     base @ 2 max ud/mod rot 9 over <
                    403:     IF
                    404:        [ char A char 9 - 1- ] Literal +
                    405:     THEN
                    406:     [char] 0 + hold ;
                    407: 
                    408: : #s      ( +d -- 0 0 ) \ core number-sign-s
                    409:     BEGIN
                    410:        # 2dup d0=
                    411:     UNTIL ;
                    412: 
                    413: \ print numbers                                        07jun92py
                    414: 
                    415: : d.r ( d n -- ) \ double      d-dot-r
                    416:     >r tuck  dabs  <# #s  rot sign #>
                    417:     r> over - spaces  type ;
                    418: 
                    419: : ud.r ( ud n -- ) \ gforth    u-d-dot-r
                    420:     >r <# #s #> r> over - spaces type ;
                    421: 
                    422: : .r ( n1 n2 -- ) \ core-ext   dot-r
                    423:     >r s>d r> d.r ;
                    424: : u.r ( u n -- )  \ core-ext   u-dot-r
                    425:     0 swap ud.r ;
                    426: 
                    427: : d. ( d -- ) \ double d-dot
                    428:     0 d.r space ;
                    429: : ud. ( ud -- ) \ gforth       u-d-dot
                    430:     0 ud.r space ;
                    431: 
                    432: : . ( n -- ) \ core    dot
                    433:     s>d d. ;
                    434: : u. ( u -- ) \ core   u-dot
                    435:     0 ud. ;
                    436: 
                    437: \ catch throw                                          23feb93py
                    438: \ bounce                                                08jun93jaw
                    439: 
                    440: \ !! allow the user to add rollback actions    anton
                    441: \ !! use a separate exception stack?           anton
                    442: 
                    443: : lp@ ( -- addr ) \ gforth     l-p-fetch
                    444:  laddr# [ 0 , ] ;
                    445: 
1.13    ! pazsan    446: Defer 'catch
        !           447: Defer 'throw
        !           448: Defer 'bounce
        !           449: 
        !           450: ' noop IS 'catch
        !           451: ' noop IS 'throw
        !           452: 
1.1       pazsan    453: : catch ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception
1.13    ! pazsan    454:     'catch
1.3       pazsan    455:     sp@ >r
                    456:     fp@ >r
                    457:     lp@ >r
                    458:     handler @ >r
                    459:     rp@ handler !
                    460:     execute
                    461:     r> handler ! rdrop rdrop rdrop 0 ;
1.1       pazsan    462: 
                    463: : throw ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
                    464:     ?DUP IF
1.3       pazsan    465:        [ here 9 cells ! ] \ entry point for signal handler
                    466:        handler @ dup 0= IF
                    467:            2 (bye)
                    468:        THEN
                    469:        rp!
1.1       pazsan    470:        r> handler !
                    471:        r> lp!
                    472:        r> fp!
1.3       pazsan    473:        r> swap >r sp! drop r>
1.13    ! pazsan    474:        'throw
1.1       pazsan    475:     THEN ;
                    476: 
                    477: \ Bouncing is very fine,
                    478: \ programming without wasting time...   jaw
                    479: : bounce ( y1 .. ym error/0 -- y1 .. ym error / y1 .. ym ) \ gforth
                    480: \ a throw without data or fp stack restauration
                    481:   ?DUP IF
1.3       pazsan    482:       handler @ rp!
                    483:       r> handler !
                    484:       r> lp!
                    485:       rdrop
                    486:       rdrop
1.13    ! pazsan    487:       'throw
1.1       pazsan    488:   THEN ;
                    489: 
                    490: \ ?stack                                               23feb93py
                    491: 
                    492: : ?stack ( ?? -- ?? ) \ gforth
1.11      pazsan    493:     sp@ s0 @ u> IF    -4 throw  THEN
                    494:     fp@ f0 @ u> IF  -&45 throw  THEN  ;
1.1       pazsan    495: \ ?stack should be code -- it touches an empty stack!
                    496: 
                    497: \ interpret                                            10mar92py
                    498: 
                    499: Defer parser
                    500: Defer name ( -- c-addr count ) \ gforth
                    501: \ get the next word from the input buffer
                    502: ' (name) IS name
                    503: Defer compiler-notfound ( c-addr count -- )
                    504: Defer interpreter-notfound ( c-addr count -- )
                    505: 
                    506: : no.extensions  ( addr u -- )
                    507:     2drop -&13 bounce ;
                    508: ' no.extensions IS compiler-notfound
                    509: ' no.extensions IS interpreter-notfound
                    510: 
                    511: : compile-only-error ( ... -- )
                    512:     -&14 throw ;
                    513: 
                    514: : interpret ( ?? -- ?? ) \ gforth
                    515:     \ interpret/compile the (rest of the) input buffer
                    516:     BEGIN
                    517:        ?stack name dup
                    518:     WHILE
                    519:        parser
                    520:     REPEAT
                    521:     2drop ;
                    522: 
                    523: \ interpreter compiler                                 30apr92py
                    524: 
                    525: \ not the most efficient implementations of interpreter and compiler
                    526: : interpreter ( c-addr u -- ) 
                    527:     2dup find-name dup
                    528:     if
                    529:        nip nip name>int execute
                    530:     else
                    531:        drop
                    532:        2dup 2>r snumber?
                    533:        IF
                    534:            2rdrop
                    535:        ELSE
                    536:            2r> interpreter-notfound
                    537:        THEN
                    538:     then ;
                    539: 
                    540: : compiler ( c-addr u -- )
                    541:     2dup find-name dup
1.4       anton     542:     if ( c-addr u nt )
1.1       pazsan    543:        nip nip name>comp execute
                    544:     else
                    545:        drop
                    546:        2dup snumber? dup
                    547:        IF
                    548:            0>
                    549:            IF
                    550:                swap postpone Literal
                    551:            THEN
                    552:            postpone Literal
                    553:            2drop
                    554:        ELSE
                    555:            drop compiler-notfound
                    556:        THEN
                    557:     then ;
                    558: 
                    559: ' interpreter  IS  parser
                    560: 
                    561: : [ ( -- ) \ core      left-bracket
                    562:     ['] interpreter  IS parser state off ; immediate
                    563: : ] ( -- ) \ core      right-bracket
                    564:     ['] compiler     IS parser state on  ;
                    565: 
                    566: \ Strings                                              22feb93py
                    567: 
                    568: : ," ( "string"<"> -- ) [char] " parse
                    569:   here over char+ allot  place align ;
                    570: : "lit ( -- addr )
                    571:   r> r> dup count + aligned >r swap >r ;
                    572: : (.")     "lit count type ;
                    573: : (S")     "lit count ;
                    574: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
                    575:     postpone (S") here over char+ allot  place align ;
                    576:                                              immediate restrict
1.12      anton     577: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ core,file    paren
1.13    ! pazsan    578:     [char] ) parse 2drop ; immediate
1.12      anton     579: 
1.1       pazsan    580: : \ ( -- ) \ core-ext backslash
                    581:     blk @
                    582:     IF
                    583:        >in @ c/l / 1+ c/l * >in !
                    584:        EXIT
                    585:     THEN
                    586:     source >in ! drop ; immediate
                    587: 
                    588: : \G ( -- ) \ gforth backslash
                    589:     POSTPONE \ ; immediate
                    590: 
                    591: \ error handling                                       22feb93py
                    592: \ 'abort thrown out!                                   11may93jaw
                    593: 
                    594: : (abort")
                    595:     "lit >r
                    596:     IF
                    597:        r> "error ! -2 throw
                    598:     THEN
                    599:     rdrop ;
                    600: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext        abort-quote
                    601:     postpone (abort") ," ;        immediate restrict
                    602: 
                    603: \ Header states                                        23feb93py
                    604: 
                    605: : cset ( bmask c-addr -- )
                    606:     tuck c@ or swap c! ; 
                    607: : creset ( bmask c-addr -- )
                    608:     tuck c@ swap invert and swap c! ; 
                    609: : ctoggle ( bmask c-addr -- )
                    610:     tuck c@ xor swap c! ; 
                    611: 
                    612: : lastflags ( -- c-addr )
                    613:     \ the address of the flags byte in the last header
                    614:     \ aborts if the last defined word was headerless
                    615:     last @ dup 0= abort" last word was headerless" cell+ ;
                    616: 
1.2       anton     617: : immediate ( -- ) \ core
                    618:     immediate-mask lastflags cset ;
                    619: : restrict ( -- ) \ gforth
                    620:     restrict-mask lastflags cset ;
                    621: ' restrict alias compile-only ( -- ) \ gforth
1.1       pazsan    622: 
                    623: \ Header                                               23feb93py
                    624: 
                    625: \ input-stream, nextname and noname are quite ugly (passing
                    626: \ information through global variables), but they are useful for dealing
                    627: \ with existing/independent defining words
                    628: 
                    629: defer (header)
                    630: defer header ( -- ) \ gforth
                    631: ' (header) IS header
                    632: 
                    633: : string, ( c-addr u -- ) \ gforth
1.3       pazsan    634:     \G puts down string as cstring
1.1       pazsan    635:     dup c, here swap chars dup allot move ;
                    636: 
                    637: : header, ( c-addr u -- ) \ gforth
                    638:     name-too-long?
                    639:     align here last !
                    640:     current @ 1 or A,  \ link field; before revealing, it contains the
                    641:                        \ tagged reveal-into wordlist
                    642:     string, cfalign
                    643:     alias-mask lastflags cset ;
                    644: 
                    645: : input-stream-header ( "name" -- )
                    646:     name name-too-short? header, ;
                    647: : input-stream ( -- )  \ general
1.3       pazsan    648:     \G switches back to getting the name from the input stream ;
1.1       pazsan    649:     ['] input-stream-header IS (header) ;
                    650: 
                    651: ' input-stream-header IS (header)
                    652: 
                    653: \ !! make that a 2variable
                    654: create nextname-buffer 32 chars allot
                    655: 
                    656: : nextname-header ( -- )
                    657:     nextname-buffer count header,
                    658:     input-stream ;
                    659: 
                    660: \ the next name is given in the string
                    661: : nextname ( c-addr u -- ) \ gforth
                    662:     name-too-long?
                    663:     nextname-buffer c! ( c-addr )
                    664:     nextname-buffer count move
                    665:     ['] nextname-header IS (header) ;
                    666: 
                    667: : noname-header ( -- )
                    668:     0 last ! cfalign
                    669:     input-stream ;
                    670: 
                    671: : noname ( -- ) \ gforth
                    672: \ the next defined word remains anonymous. The xt of that word is given by lastxt
                    673:     ['] noname-header IS (header) ;
                    674: 
                    675: : lastxt ( -- xt ) \ gforth
                    676: \ xt is the execution token of the last word defined. The main purpose of this word is to get the xt of words defined using noname
                    677:     lastcfa @ ;
                    678: 
                    679: : Alias    ( cfa "name" -- ) \ gforth
                    680:     Header reveal
                    681:     alias-mask lastflags creset
                    682:     dup A, lastcfa ! ;
                    683: 
1.4       anton     684: : name>string ( nt -- addr count ) \ gforth    name-to-string
                    685:     \g @var{addr count} is the name of the word represented by @var{nt}.
                    686:     cell+ count $1F and ;
1.1       pazsan    687: 
                    688: Create ???  0 , 3 c, char ? c, char ? c, char ? c,
1.4       anton     689: : >name ( cfa -- nt ) \ gforth to-name
1.1       pazsan    690:  $21 cell do
                    691:    dup i - count $9F and + cfaligned over alias-mask + = if
                    692:      i - cell - unloop exit
                    693:    then
                    694:  cell +loop
                    695:  drop ??? ( wouldn't 0 be better? ) ;
                    696: 
                    697: \ threading                                   17mar93py
                    698: 
                    699: : cfa,     ( code-address -- )  \ gforth       cfa-comma
                    700:     here
                    701:     dup lastcfa !
                    702:     0 A, 0 ,  code-address! ;
                    703: : compile, ( xt -- )   \ core-ext      compile-comma
                    704:     A, ;
                    705: : !does    ( addr -- ) \ gforth        store-does
                    706:     lastxt does-code! ;
                    707: : (does>)  ( R: addr -- )
                    708:     r> /does-handler + !does ;
                    709: : dodoes,  ( -- )
                    710:   here /does-handler allot does-handler! ;
                    711: 
                    712: : Create ( "name" -- ) \ core
                    713:     Header reveal dovar: cfa, ;
                    714: 
                    715: \ Create Variable User Constant                        17mar93py
                    716: 
                    717: : Variable ( "name" -- ) \ core
                    718:     Create 0 , ;
                    719: : AVariable ( "name" -- ) \ gforth
                    720:     Create 0 A, ;
                    721: : 2VARIABLE ( "name" -- ) \ double
                    722:     create 0 , 0 , ;
                    723:     
                    724: : User ( "name" -- ) \ gforth
                    725:     Variable ;
                    726: : AUser ( "name" -- ) \ gforth
                    727:     AVariable ;
                    728: 
                    729: : (Constant)  Header reveal docon: cfa, ;
                    730: : Constant ( w "name" -- ) \ core
1.3       pazsan    731:     \G Defines constant @var{name}
                    732:     \G  
                    733:     \G @var{name} execution: @var{-- w}
1.1       pazsan    734:     (Constant) , ;
                    735: : AConstant ( addr "name" -- ) \ gforth
                    736:     (Constant) A, ;
                    737: 
                    738: : 2Constant ( w1 w2 "name" -- ) \ double
                    739:     Create ( w1 w2 "name" -- )
                    740:         2,
                    741:     DOES> ( -- w1 w2 )
                    742:         2@ ;
                    743:     
                    744: \ IS Defer What's Defers TO                            24feb93py
                    745: 
                    746: : Defer ( "name" -- ) \ gforth
                    747:     \ !! shouldn't it be initialized with abort or something similar?
                    748:     Header Reveal dodefer: cfa,
                    749:     ['] noop A, ;
                    750: \     Create ( -- ) 
                    751: \      ['] noop A,
                    752: \     DOES> ( ??? )
                    753: \      perform ;
                    754: 
                    755: : Defers ( "name" -- ) \ gforth
                    756:     ' >body @ compile, ; immediate
                    757: 
                    758: \ : ;                                                  24feb93py
                    759: 
                    760: defer :-hook ( sys1 -- sys2 )
                    761: defer ;-hook ( sys2 -- sys1 )
                    762: 
                    763: : : ( "name" -- colon-sys ) \ core     colon
                    764:     Header docol: cfa, defstart ] :-hook ;
                    765: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core    semicolon
                    766:     ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
                    767: 
                    768: : :noname ( -- xt colon-sys ) \ core-ext       colon-no-name
                    769:     0 last !
                    770:     cfalign here docol: cfa, 0 ] :-hook ;
                    771: 
                    772: \ Search list handling                                 23feb93py
                    773: 
                    774: AVariable current ( -- addr ) \ gforth
                    775: 
                    776: : last?   ( -- false / nfa nfa )
                    777:     last @ ?dup ;
1.4       anton     778: : (reveal) ( nt wid -- )
1.1       pazsan    779:     ( wid>wordlist-id ) dup >r
                    780:     @ over ( name>link ) ! 
                    781:     r> ! ;
                    782: 
                    783: \ object oriented search list                          17mar93py
                    784: 
                    785: \ word list structure:
                    786: 
                    787: struct
1.4       anton     788:   1 cells: field find-method   \ xt: ( c_addr u wid -- nt )
                    789:   1 cells: field reveal-method \ xt: ( nt wid -- ) \ used by dofield:, must be field
1.1       pazsan    790:   1 cells: field rehash-method \ xt: ( wid -- )
                    791: \   \ !! what else
                    792: end-struct wordlist-map-struct
                    793: 
                    794: struct
                    795:   1 cells: field wordlist-id \ not the same as wid; representation depends on implementation
                    796:   1 cells: field wordlist-map \ pointer to a wordlist-map-struct
                    797:   1 cells: field wordlist-link \ link field to other wordlists
                    798:   1 cells: field wordlist-extend \ points to wordlist extensions (eg hash)
                    799: end-struct wordlist-struct
                    800: 
1.4       anton     801: : f83find      ( addr len wordlist -- nt / false )
1.1       pazsan    802:     ( wid>wordlist-id ) @ (f83find) ;
                    803: 
                    804: \ Search list table: find reveal
                    805: Create f83search ( -- wordlist-map )
                    806:     ' f83find A,  ' (reveal) A,  ' drop A,
                    807: 
                    808: Create forth-wordlist  NIL A, G f83search T A, NIL A, NIL A,
                    809: AVariable lookup       G forth-wordlist lookup T !
                    810: G forth-wordlist current T !
                    811: 
                    812: \ higher level parts of find
                    813: 
                    814: ( struct )
                    815: 0 >body cell
                    816:   1 cells: field interpret/compile-int
                    817:   1 cells: field interpret/compile-comp
                    818: end-struct interpret/compile-struct
                    819: 
                    820: : interpret/compile? ( xt -- flag )
                    821:     >does-code ['] S" >does-code = ;
                    822: 
                    823: : (cfa>int) ( cfa -- xt )
                    824:     dup interpret/compile?
                    825:     if
                    826:        interpret/compile-int @
                    827:     then ;
                    828: 
                    829: : (x>int) ( cfa b -- xt )
                    830:     \ get interpretation semantics of name
                    831:     restrict-mask and
                    832:     if
                    833:        drop ['] compile-only-error
                    834:     else
                    835:        (cfa>int)
                    836:     then ;
                    837: 
1.4       anton     838: : name>int ( nt -- xt ) \ gforth
                    839:     \G @var{xt} represents the interpretation semantics of the word
                    840:     \G @var{nt}. Produces @code{' compile-only-error} if
                    841:     \G @var{nt} is compile-only.
1.1       pazsan    842:     (name>x) (x>int) ;
                    843: 
1.4       anton     844: : name?int ( nt -- xt ) \ gforth
                    845:     \G Like name>int, but throws an error if compile-only.
1.1       pazsan    846:     (name>x) restrict-mask and
                    847:     if
                    848:        compile-only-error \ does not return
                    849:     then
                    850:     (cfa>int) ;
                    851: 
1.4       anton     852: : name>comp ( nt -- w xt ) \ gforth
1.10      anton     853:     \G @var{w xt} is the compilation token for the word @var{nt}.
1.1       pazsan    854:     (name>x) >r dup interpret/compile?
                    855:     if
                    856:        interpret/compile-comp @
                    857:     then
                    858:     r> immediate-mask and if
                    859:        ['] execute
                    860:     else
                    861:        ['] compile,
                    862:     then ;
                    863: 
1.4       anton     864: : (search-wordlist)  ( addr count wid -- nt / false )
1.1       pazsan    865:     dup wordlist-map @ find-method perform ;
                    866: 
                    867: : flag-sign ( f -- 1|-1 )
                    868:     \ true becomes 1, false -1
                    869:     0= 2* 1+ ;
                    870: 
                    871: : (name>intn) ( nfa -- xt +-1 )
                    872:     (name>x) tuck (x>int) ( b xt )
                    873:     swap immediate-mask and flag-sign ;
                    874: 
                    875: : search-wordlist ( addr count wid -- 0 / xt +-1 ) \ search
                    876:     \ xt is the interpretation semantics
                    877:     (search-wordlist) dup if
                    878:        (name>intn)
                    879:     then ;
                    880: 
1.4       anton     881: : find-name ( c-addr u -- nt/0 ) \ gforth
                    882:     \g Find the name @var{c-addr u} in the current search
                    883:     \g order. Return its nt, if found, otherwise 0.
1.1       pazsan    884:     lookup @ (search-wordlist) ;
                    885: 
                    886: : sfind ( c-addr u -- 0 / xt +-1  ) \ gforth-obsolete
                    887:     find-name dup
1.4       anton     888:     if ( nt )
1.1       pazsan    889:        state @
                    890:        if
                    891:            name>comp ['] execute = flag-sign
                    892:        else
                    893:            (name>intn)
                    894:        then
                    895:     then ;
                    896: 
                    897: : find ( c-addr -- xt +-1 / c-addr 0 ) \ core
                    898:     dup count sfind dup
                    899:     if
                    900:        rot drop
                    901:     then ;
                    902: 
1.4       anton     903: : (') ( "name" -- nt ) \ gforth
1.1       pazsan    904:     name find-name dup 0=
                    905:     IF
                    906:        drop -&13 bounce
                    907:     THEN  ;
                    908: 
1.4       anton     909: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth   bracket-paren-tick
1.1       pazsan    910:     (') postpone ALiteral ; immediate restrict
                    911: 
                    912: : '    ( "name" -- xt ) \ core tick
1.4       anton     913:     \g @var{xt} represents @var{name}'s interpretation
                    914:     \g semantics. Performs @code{-14 throw} if the word has no
                    915:     \g interpretation semantics.
1.1       pazsan    916:     (') name?int ;
1.4       anton     917: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core     bracket-tick
                    918:     \g @var{xt} represents @var{name}'s interpretation
                    919:     \g semantics. Performs @code{-14 throw} if the word has no
                    920:     \g interpretation semantics.
1.1       pazsan    921:     ' postpone ALiteral ; immediate restrict
                    922: 
                    923: : COMP'    ( "name" -- w xt ) \ gforth c-tick
1.4       anton     924:     \g @var{w xt} represents @var{name}'s compilation semantics.
1.1       pazsan    925:     (') name>comp ;
                    926: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth       bracket-comp-tick
1.4       anton     927:     \g @var{w xt} represents @var{name}'s compilation semantics.
1.1       pazsan    928:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
                    929: 
                    930: \ reveal words
                    931: 
                    932: Variable warnings ( -- addr ) \ gforth
                    933: G -1 warnings T !
                    934: 
                    935: : check-shadow  ( addr count wid -- )
1.3       pazsan    936: \G prints a warning if the string is already present in the wordlist
1.1       pazsan    937:  >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
                    938:    ." redefined " name>string 2dup type
                    939:    compare 0<> if
                    940:      ."  with " type
                    941:    else
                    942:      2drop
                    943:    then
                    944:    space space EXIT
                    945:  then
                    946:  2drop 2drop ;
                    947: 
                    948: : reveal ( -- ) \ gforth
                    949:     last?
                    950:     if \ the last word has a header
                    951:        dup ( name>link ) @ 1 and
                    952:        if \ it is still hidden
1.4       anton     953:            dup ( name>link ) @ 1 xor           ( nt wid )
                    954:            2dup >r name>string r> check-shadow ( nt wid )
1.1       pazsan    955:            dup wordlist-map @ reveal-method perform
                    956:        then
                    957:     then ;
                    958: 
                    959: : rehash  ( wid -- )
                    960:     dup wordlist-map @ rehash-method perform ;
                    961: 
                    962: \ Input                                                13feb93py
                    963: 
                    964: 07 constant #bell ( -- c ) \ gforth
                    965: 08 constant #bs ( -- c ) \ gforth
                    966: 09 constant #tab ( -- c ) \ gforth
                    967: 7F constant #del ( -- c ) \ gforth
                    968: 0D constant #cr   ( -- c ) \ gforth
                    969: \ the newline key code
                    970: 0C constant #ff ( -- c ) \ gforth
                    971: 0A constant #lf ( -- c ) \ gforth
                    972: 
                    973: : bell  #bell emit ;
                    974: : cr ( -- ) \ core
                    975:     \ emit a newline
                    976:     #lf ( sic! ) emit ;
                    977: 
                    978: \ : backspaces  0 ?DO  #bs emit  LOOP ;
                    979: 
                    980: : (ins) ( max span addr pos1 key -- max span addr pos2 )
                    981:     >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
                    982: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
                    983:     dup IF
                    984:        #bs emit bl emit #bs emit 1- rot 1- -rot
                    985:     THEN false ;
                    986: : (ret)  true space ;
                    987: 
                    988: Create ctrlkeys
                    989:   ] false false false false  false false false false
                    990:     (bs)  false (ret) false  false (ret) false false
                    991:     false false false false  false false false false
                    992:     false false false false  false false false false [
                    993: 
                    994: defer insert-char
                    995: ' (ins) IS insert-char
                    996: defer everychar
                    997: ' noop IS everychar
                    998: 
                    999: : decode ( max span addr pos1 key -- max span addr pos2 flag )
                   1000:   everychar
                   1001:   dup #del = IF  drop #bs  THEN  \ del is rubout
                   1002:   dup bl <   IF  cells ctrlkeys + perform  EXIT  THEN
                   1003:   >r 2over = IF  rdrop bell 0 EXIT  THEN
                   1004:   r> insert-char 0 ;
                   1005: 
                   1006: : accept   ( addr len -- len ) \ core
                   1007:   dup 0< IF    abs over dup 1 chars - c@ tuck type 
                   1008: \ this allows to edit given strings
                   1009:          ELSE  0  THEN rot over
                   1010:   BEGIN  key decode  UNTIL
                   1011:   2drop nip ;
                   1012: 
                   1013: \ Output                                               13feb93py
                   1014: 
                   1015: : (type) ( c-addr u -- ) \ gforth
                   1016:     outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
                   1017: ;
                   1018: 
                   1019: Defer type ( c-addr u -- ) \ core
                   1020: \ defer type for a output buffer or fast
                   1021: \ screen write
                   1022: 
                   1023: ' (type) IS Type
                   1024: 
                   1025: : (emit) ( c -- ) \ gforth
                   1026:     outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
                   1027: ;
                   1028: 
                   1029: Defer emit ( c -- ) \ core
                   1030: ' (Emit) IS Emit
                   1031: 
                   1032: Defer key ( -- c ) \ core
                   1033: ' (key) IS key
                   1034: 
                   1035: \ Query                                                07apr93py
                   1036: 
                   1037: : refill ( -- flag ) \ core-ext,block-ext,file-ext
                   1038:   blk @  IF  1 blk +!  true  0 >in !  EXIT  THEN
                   1039:   tib /line
                   1040:   loadfile @ ?dup
                   1041:   IF    read-line throw
                   1042:   ELSE  sourceline# 0< IF 2drop false EXIT THEN
                   1043:         accept true
                   1044:   THEN
                   1045:   1 loadline +!
                   1046:   swap #tib ! 0 >in ! ;
                   1047: 
1.8       anton    1048: : query   ( -- ) \ core-ext
1.3       pazsan   1049:     \G obsolescent
1.13    ! pazsan   1050:     blk off loadfile off
1.8       anton    1051:     tib /line accept #tib ! 0 >in ! ;
1.1       pazsan   1052: 
1.13    ! pazsan   1053: \ save-mem extend-mem
1.1       pazsan   1054: 
1.13    ! pazsan   1055: : save-mem     ( addr1 u -- addr2 u ) \ gforth
        !          1056:     \g copy a memory block into a newly allocated region in the heap
        !          1057:     swap >r
        !          1058:     dup allocate throw
        !          1059:     swap 2dup r> -rot move ;
1.1       pazsan   1060: 
1.13    ! pazsan   1061: : extend-mem   ( addr1 u1 u -- addr addr2 u2 )
        !          1062:     \ extend memory block allocated from the heap by u aus
        !          1063:     \ the (possibly reallocated piece is addr2 u2, the extension is at addr
        !          1064:     over >r + dup >r resize throw
        !          1065:     r> over r> + -rot ;
1.1       pazsan   1066: 
                   1067: \ HEX DECIMAL                                           2may93jaw
                   1068: 
                   1069: : decimal ( -- ) \ core
                   1070:     a base ! ;
                   1071: : hex ( -- ) \ core-ext
                   1072:     10 base ! ;
                   1073: 
                   1074: \ DEPTH                                                 9may93jaw
                   1075: 
                   1076: : depth ( -- +n ) \ core
                   1077:     sp@ s0 @ swap - cell / ;
                   1078: : clearstack ( ... -- )
                   1079:     s0 @ sp! ;
                   1080: 
                   1081: \ RECURSE                                               17may93jaw
                   1082: 
                   1083: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
                   1084:     lastxt compile, ; immediate restrict
                   1085: ' reveal alias recursive ( -- ) \ gforth
                   1086:        immediate
                   1087: 
                   1088: \ */MOD */                                              17may93jaw
                   1089: 
                   1090: \ !! I think */mod should have the same rounding behaviour as / - anton
                   1091: : */mod ( n1 n2 n3 -- n4 n5 ) \ core   star-slash-mod
                   1092:     >r m* r> sm/rem ;
                   1093: 
                   1094: : */ ( n1 n2 n3 -- n4 ) \ core star-slash
                   1095:     */mod nip ;
                   1096: 
                   1097: \ EVALUATE                                              17may93jaw
                   1098: 
                   1099: : evaluate ( c-addr len -- ) \ core,block
                   1100:   push-file  #tib ! >tib !
                   1101:   >in off blk off loadfile off -1 loadline !
                   1102:   ['] interpret catch
                   1103:   pop-file throw ;
                   1104: 
                   1105: : abort ( ?? -- ?? ) \ core,exception-ext
                   1106:     -1 throw ;
                   1107: 
                   1108: \+ environment? true ENV" CORE"
                   1109: \ core wordset is now complete!
                   1110: 
                   1111: \ Quit                                                 13feb93py
                   1112: 
                   1113: Defer 'quit
                   1114: Defer .status
                   1115: : prompt        state @ IF ."  compiled" EXIT THEN ."  ok" ;
1.8       anton    1116: : (Query)  ( -- )
                   1117:     loadfile off  blk off  refill drop ;
                   1118: : (quit)        BEGIN .status cr (query) interpret prompt AGAIN ;
1.1       pazsan   1119: ' (quit) IS 'quit
                   1120: 
                   1121: \ DOERROR (DOERROR)                                     13jun93jaw
                   1122: 
                   1123: 8 Constant max-errors
                   1124: Variable error-stack  0 error-stack !
                   1125: max-errors 6 * cells allot
                   1126: \ format of one cell:
                   1127: \ source ( addr u )
                   1128: \ >in
                   1129: \ line-number
                   1130: \ Loadfilename ( addr u )
                   1131: 
                   1132: : dec. ( n -- ) \ gforth
                   1133:     \ print value in decimal representation
                   1134:     base @ decimal swap . base ! ;
                   1135: 
                   1136: : hex. ( u -- ) \ gforth
                   1137:     \ print value as unsigned hex number
                   1138:     '$ emit base @ swap hex u. base ! ;
                   1139: 
                   1140: : typewhite ( addr u -- ) \ gforth
                   1141:     \ like type, but white space is printed instead of the characters
                   1142:     bounds ?do
1.10      anton    1143:        i c@ #tab = if \ check for tab
                   1144:            #tab
1.1       pazsan   1145:        else
                   1146:            bl
                   1147:        then
                   1148:        emit
                   1149:     loop ;
                   1150: 
                   1151: DEFER DOERROR
                   1152: 
                   1153: : .error-frame ( addr1 u1 n1 n2 addr2 u2 -- )
                   1154:   cr error-stack @
                   1155:   IF
                   1156:      ." in file included from "
                   1157:      type ." :" dec.  drop 2drop
                   1158:   ELSE
                   1159:      type ." :" dec.
                   1160:      cr dup 2over type cr drop
                   1161:      nip -trailing 1- ( line-start index2 )
                   1162:      0 >r  BEGIN
                   1163:                   2dup + c@ bl >  WHILE
                   1164:                  r> 1+ >r  1- dup 0<  UNTIL  THEN  1+
                   1165:      ( line-start index1 )
                   1166:      typewhite
                   1167:      r> 1 max 0 ?do \ we want at least one "^", even if the length is 0
                   1168:                   [char] ^ emit
                   1169:      loop
                   1170:   THEN
                   1171: ;
                   1172: 
                   1173: : (DoError) ( throw-code -- )
                   1174:   sourceline# IF
                   1175:                source >in @ sourceline# 0 0 .error-frame
                   1176:   THEN
                   1177:   error-stack @ 0 ?DO
                   1178:     -1 error-stack +!
                   1179:     error-stack dup @ 6 * cells + cell+
                   1180:     6 cells bounds DO
                   1181:       I @
                   1182:     cell +LOOP
                   1183:     .error-frame
                   1184:   LOOP
                   1185:   dup -2 =
                   1186:   IF 
                   1187:      "error @ ?dup
                   1188:      IF
                   1189:         cr count type 
                   1190:      THEN
                   1191:      drop
                   1192:   ELSE
                   1193:      .error
                   1194:   THEN
                   1195:   normal-dp dpp ! ;
                   1196: 
                   1197: ' (DoError) IS DoError
                   1198: 
                   1199: : quit ( ?? -- ?? ) \ core
                   1200:     r0 @ rp! handler off >tib @ >r
                   1201:     BEGIN
                   1202:        postpone [
                   1203:        ['] 'quit CATCH dup
                   1204:     WHILE
                   1205:        DoError r@ >tib ! r@ tibstack !
                   1206:     REPEAT
                   1207:     drop r> >tib ! ;
                   1208: 
                   1209: \ Cold                                                 13feb93py
                   1210: 
                   1211: \ : .name ( name -- ) name>string type space ;
                   1212: \ : words  listwords @
                   1213: \          BEGIN  @ dup  WHILE  dup .name  REPEAT drop ;
                   1214: Defer 'cold ' noop IS 'cold
                   1215: 
                   1216: : cold ( -- ) \ gforth
                   1217:     stdout TO outfile-id
                   1218:     pathstring 2@ process-path pathdirs 2!
                   1219:     init-included-files
                   1220:     'cold
                   1221:     argc @ 1 >
                   1222:     IF
                   1223:        ['] process-args catch ?dup
                   1224:        IF
                   1225:            dup >r DoError cr r> negate (bye)
                   1226:        THEN
                   1227:        cr
                   1228:     THEN
                   1229:     ." GForth " version-string type ." , Copyright (C) 1994-1996 Free Software Foundation, Inc." cr
                   1230:     ." GForth comes with ABSOLUTELY NO WARRANTY; for details type `license'" cr
                   1231:     ." Type `bye' to exit"
                   1232:     loadline off quit ;
                   1233: 
                   1234: : license ( -- ) \ gforth
                   1235:  cr
                   1236:  ." This program is free software; you can redistribute it and/or modify" cr
                   1237:  ." it under the terms of the GNU General Public License as published by" cr
                   1238:  ." the Free Software Foundation; either version 2 of the License, or" cr
                   1239:  ." (at your option) any later version." cr cr
                   1240: 
                   1241:  ." This program is distributed in the hope that it will be useful," cr
                   1242:  ." but WITHOUT ANY WARRANTY; without even the implied warranty of" cr
                   1243:  ." MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the" cr
                   1244:  ." GNU General Public License for more details." cr cr
                   1245: 
                   1246:  ." You should have received a copy of the GNU General Public License" cr
                   1247:  ." along with this program; if not, write to the Free Software" cr
                   1248:  ." Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA." cr ;
                   1249: 
                   1250: : boot ( path **argv argc -- )
1.7       anton    1251:   argc ! argv ! pathstring 2!  main-task up!
1.9       anton    1252:   sp@ s0 !
                   1253:   lp@ forthstart 7 cells + @ - dup >tib ! tibstack ! #tib off >in off
                   1254:   rp@ r0 !
                   1255:   fp@ f0 !
                   1256:   ['] cold catch DoError
                   1257:   bye ;
1.1       pazsan   1258: 
                   1259: : bye ( -- ) \ tools-ext
                   1260:     script? 0= IF  cr  THEN  0 (bye) ;
                   1261: 
                   1262: \ **argv may be scanned by the C starter to get some important
                   1263: \ information, as -display and -geometry for an X client FORTH
                   1264: \ or space and stackspace overrides
                   1265: 
                   1266: \ 0 arg contains, however, the name of the program.
                   1267: 
                   1268: 

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