Annotation of gforth/kernel/int.fs, revision 1.181

1.1       pazsan      1: \ definitions needed for interpreter only
                      2: 
1.177     anton       3: \ Copyright (C) 1995-2000,2004,2005,2007,2009,2010 Free Software Foundation, Inc.
1.11      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
1.161     anton       9: \ as published by the Free Software Foundation, either version 3
1.11      anton      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
1.161     anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.11      anton      19: 
1.1       pazsan     20: \ \ Revision-Log
                     21: 
                     22: \       put in seperate file                           14sep97jaw 
                     23: 
                     24: \ \ input stream primitives                            23feb93py
                     25: 
1.33      jwilke     26: require ./basics.fs    \ bounds decimal hex ...
                     27: require ./io.fs                \ type ...
                     28: require ./nio.fs       \ . <# ...
                     29: require ./errore.fs    \ .error ...
1.165     anton      30: require kernel/version.fs \ version-string
1.33      jwilke     31: 
1.64      pazsan     32: has? new-input 0= [IF]
1.43      crook      33: : tib ( -- c-addr ) \ core-ext t-i-b
1.40      crook      34:     \G @i{c-addr} is the address of the Terminal Input Buffer.
1.29      crook      35:     \G OBSOLESCENT: @code{source} superceeds the function of this word.
1.1       pazsan     36:     >tib @ ;
                     37: 
1.29      crook      38: Defer source ( -- c-addr u ) \ core
1.1       pazsan     39: \ used by dodefer:, must be defer
1.40      crook      40: \G @i{c-addr} is the address of the input buffer and @i{u} is the
1.29      crook      41: \G number of characters in it.
1.1       pazsan     42: 
1.29      crook      43: : (source) ( -- c-addr u )
1.1       pazsan     44:     tib #tib @ ;
                     45: ' (source) IS source
1.64      pazsan     46: [THEN]
1.1       pazsan     47: 
                     48: : (word) ( addr1 n1 char -- addr2 n2 )
                     49:   dup >r skip 2dup r> scan  nip - ;
                     50: 
                     51: \ (word) should fold white spaces
                     52: \ this is what (parse-white) does
                     53: 
1.174     anton      54: \ parse                                           23feb93py
1.29      crook      55: 
                     56: : parse    ( char "ccc<char>" -- c-addr u ) \ core-ext
1.80      anton      57: \G Parse @i{ccc}, delimited by @i{char}, in the parse
                     58: \G area. @i{c-addr u} specifies the parsed string within the
                     59: \G parse area. If the parse area was empty, @i{u} is 0.
1.132     anton      60:     >r  source  >in @ over min /string ( c-addr1 u1 )
1.130     anton      61:     over  swap r>  scan >r
1.132     anton      62:     over - dup r> IF 1+ THEN  >in +!
1.138     pazsan     63: [ has? new-input [IF] ]
                     64:     2dup input-lexeme!
                     65: [ [THEN] ] ;
1.1       pazsan     66: 
                     67: \ name                                                 13feb93py
                     68: 
                     69: [IFUNDEF] (name) \ name might be a primitive
                     70: 
1.40      crook      71: : (name) ( -- c-addr count ) \ gforth
1.1       pazsan     72:     source 2dup >r >r >in @ /string (parse-white)
1.138     pazsan     73: [ has? new-input [IF] ]
1.132     anton      74:     2dup input-lexeme!
1.138     pazsan     75: [ [THEN] ]
1.1       pazsan     76:     2dup + r> - 1+ r> min >in ! ;
                     77: \    name count ;
                     78: [THEN]
                     79: 
                     80: : name-too-short? ( c-addr u -- c-addr u )
                     81:     dup 0= -&16 and throw ;
                     82: 
                     83: : name-too-long? ( c-addr u -- c-addr u )
1.67      anton      84:     dup lcount-mask u> -&19 and throw ;
1.1       pazsan     85: 
                     86: \ \ Number parsing                                     23feb93py
                     87: 
1.167     anton      88: \ (number?) number                                       23feb93py
1.1       pazsan     89: 
                     90: hex
1.110     anton      91: const Create bases   0A , 10 ,   2 ,   0A ,
1.109     anton      92: \                    10   16     2     10
1.1       pazsan     93: 
1.18      anton      94: \ !! protect BASE saving wrapper against exceptions
1.1       pazsan     95: : getbase ( addr u -- addr' u' )
1.108     anton      96:     2dup s" 0x" string-prefix? >r
                     97:     2dup s" 0X" string-prefix? r> or
1.117     anton      98:     base @ &34 < and if
1.108     anton      99:        hex 2 /string
                    100:     endif
1.109     anton     101:     over c@ [char] # - dup 4 u<
1.1       pazsan    102:     IF
                    103:        cells bases + @ base ! 1 /string
                    104:     ELSE
                    105:        drop
                    106:     THEN ;
                    107: 
1.124     anton     108: : sign? ( addr u -- addr1 u1 flag )
1.33      jwilke    109:     over c@ [char] - =  dup >r
1.1       pazsan    110:     IF
                    111:        1 /string
                    112:     THEN
1.20      pazsan    113:     r> ;
                    114: 
1.159     anton     115: : ?dnegate ( d1 f -- d2 )
                    116:     if
                    117:         dnegate
                    118:     then ;
                    119: 
1.157     pazsan    120: has? os 0= [IF]
                    121: : x@+/string ( addr u -- addr' u' c )
                    122:     over c@ >r 1 /string r> ;
                    123: [THEN]
                    124: 
1.109     anton     125: : s'>unumber? ( addr u -- ud flag )
                    126:     \ convert string "C" or "C'" to character code
                    127:     dup 0= if
                    128:        false exit
                    129:     endif
1.116     anton     130:     x@+/string 0 s" '" 2rot string-prefix? ;
1.109     anton     131: 
1.159     anton     132: : s>unumber? ( c-addr u -- ud flag ) \ gforth
                    133:     \G converts string c-addr u into ud, flag indicates success
1.121     anton     134:     dpl on
1.109     anton     135:     over c@ '' = if
                    136:        1 /string s'>unumber? exit
                    137:     endif
1.166     anton     138:     base @ >r  getbase sign?
                    139:     over if
                    140:         >r 0. 2swap
                    141:         BEGIN ( d addr len )
                    142:             dup >r >number dup
                    143:         WHILE \ there are characters left
                    144:                 dup r> -
                    145:             WHILE \ the last >number parsed something
                    146:                     dup 1- dpl ! over c@ [char] . =
                    147:                 WHILE \ the current char is '.'
                    148:                         1 /string
                    149:                 REPEAT  THEN \ there are unparseable characters left
                    150:             2drop rdrop false
                    151:         ELSE
                    152:             rdrop 2drop r> ?dnegate true
                    153:         THEN
1.20      pazsan    154:     ELSE
1.166     anton     155:         drop 2drop 0. false THEN
1.21      pazsan    156:     r> base ! ;
1.20      pazsan    157: 
                    158: \ ouch, this is complicated; there must be a simpler way - anton
1.125     anton     159: : s>number? ( addr u -- d f ) \ gforth
                    160:     \G converts string addr u into d, flag indicates success
1.21      pazsan    161:     sign? >r
1.20      pazsan    162:     s>unumber?
                    163:     0= IF
1.21      pazsan    164:         rdrop false
1.18      anton     165:     ELSE \ no characters left, all ok
1.159     anton     166:        r> ?dnegate
1.18      anton     167:        true
1.21      pazsan    168:     THEN ;
1.1       pazsan    169: 
1.18      anton     170: : s>number ( addr len -- d )
                    171:     \ don't use this, there is no way to tell success
                    172:     s>number? drop ;
                    173: 
1.1       pazsan    174: : snumber? ( c-addr u -- 0 / n -1 / d 0> )
1.18      anton     175:     s>number? 0=
1.1       pazsan    176:     IF
                    177:        2drop false  EXIT
                    178:     THEN
1.18      anton     179:     dpl @ dup 0< IF
1.1       pazsan    180:        nip
1.18      anton     181:     ELSE
                    182:        1+
1.1       pazsan    183:     THEN ;
                    184: 
1.167     anton     185: : (number?) ( string -- string 0 / n -1 / d 0> )
1.1       pazsan    186:     dup >r count snumber? dup if
                    187:        rdrop
                    188:     else
                    189:        r> swap
                    190:     then ;
                    191: 
                    192: : number ( string -- d )
1.167     anton     193:     (number?) ?dup 0= abort" ?"  0<
1.1       pazsan    194:     IF
                    195:        s>d
                    196:     THEN ;
                    197: 
                    198: \ \ Comments ( \ \G
                    199: 
1.29      crook     200: : ( ( compilation 'ccc<close-paren>' -- ; run-time -- ) \ thisone- core,file   paren
1.17      crook     201:     \G ** this will not get annotated. The alias in glocals.fs will instead **
1.29      crook     202:     \G It does not work to use "wordset-" prefix since this file is glossed
                    203:     \G by cross.fs which doesn't have the same functionalty as makedoc.fs
1.1       pazsan    204:     [char] ) parse 2drop ; immediate
                    205: 
1.51      anton     206: : \ ( compilation 'ccc<newline>' -- ; run-time -- ) \ thisone- core-ext,block-ext backslash
1.29      crook     207:     \G ** this will not get annotated. The alias in glocals.fs will instead ** 
                    208:     \G It does not work to use "wordset-" prefix since this file is glossed
                    209:     \G by cross.fs which doesn't have the same functionalty as makedoc.fs
1.12      pazsan    210:     [ has? file [IF] ]
1.1       pazsan    211:     blk @
                    212:     IF
                    213:        >in @ c/l / 1+ c/l * >in !
                    214:        EXIT
                    215:     THEN
1.12      pazsan    216:     [ [THEN] ]
1.1       pazsan    217:     source >in ! drop ; immediate
                    218: 
1.51      anton     219: : \G ( compilation 'ccc<newline>' -- ; run-time -- ) \ gforth backslash-gee
1.19      crook     220:     \G Equivalent to @code{\} but used as a tag to annotate definition
                    221:     \G comments into documentation.
1.1       pazsan    222:     POSTPONE \ ; immediate
                    223: 
1.139     pazsan    224: has? ec [IF]
                    225:     AVariable forth-wordlist
                    226:     : find-name ( c-addr u -- nt | 0 ) \ gforth
                    227:        \g Find the name @i{c-addr u} in the current search
                    228:        \g order. Return its @i{nt}, if found, otherwise 0.
1.149     pazsan    229:        forth-wordlist (f83find) ;
1.139     pazsan    230: [ELSE]
1.1       pazsan    231: \ \ object oriented search list                         17mar93py
                    232: 
                    233: \ word list structure:
                    234: 
                    235: struct
                    236:   cell% field find-method   \ xt: ( c_addr u wid -- nt )
                    237:   cell% field reveal-method \ xt: ( nt wid -- ) \ used by dofield:, must be field
                    238:   cell% field rehash-method \ xt: ( wid -- )      \ re-initializes a "search-data" (hashtables)
                    239:   cell% field hash-method   \ xt: ( wid -- )    \ initializes ""
                    240: \   \ !! what else
                    241: end-struct wordlist-map-struct
                    242: 
                    243: struct
1.6       pazsan    244:   cell% field wordlist-map \ pointer to a wordlist-map-struct
1.13      anton     245:   cell% field wordlist-id \ linked list of words (for WORDS etc.)
1.1       pazsan    246:   cell% field wordlist-link \ link field to other wordlists
1.13      anton     247:   cell% field wordlist-extend \ wordlist extensions (eg bucket offset)
1.1       pazsan    248: end-struct wordlist-struct
                    249: 
1.103     pazsan    250: has? f83headerstring [IF]
                    251: : f83find      ( addr len wordlist -- nt / false )
                    252:     wordlist-id @ (f83find) ;
                    253: [ELSE]
1.1       pazsan    254: : f83find      ( addr len wordlist -- nt / false )
1.67      anton     255:     wordlist-id @ (listlfind) ;
1.103     pazsan    256: [THEN]
1.1       pazsan    257: 
                    258: : initvoc              ( wid -- )
                    259:   dup wordlist-map @ hash-method perform ;
                    260: 
                    261: \ Search list table: find reveal
                    262: Create f83search ( -- wordlist-map )
                    263:     ' f83find A,  ' drop A,  ' drop A, ' drop A,
                    264: 
1.168     pazsan    265: here f83search A, NIL A, NIL A, NIL A,
1.1       pazsan    266: AValue forth-wordlist \ variable, will be redefined by search.fs
                    267: 
                    268: AVariable lookup               forth-wordlist lookup !
                    269: \ !! last is user and lookup?! jaw
                    270: AVariable current ( -- addr ) \ gforth
1.43      crook     271: \G @code{Variable} -- holds the @i{wid} of the compilation word list.
1.1       pazsan    272: AVariable voclink      forth-wordlist wordlist-link voclink !
1.38      anton     273: \ lookup AValue context ( -- addr ) \ gforth
                    274: Defer context ( -- addr ) \ gforth
1.43      crook     275: \G @code{context} @code{@@} is the @i{wid} of the word list at the
                    276: \G top of the search order.
1.1       pazsan    277: 
1.38      anton     278: ' lookup is context
1.1       pazsan    279: forth-wordlist current !
                    280: 
1.139     pazsan    281: : (search-wordlist)  ( addr count wid -- nt | false )
                    282:     dup wordlist-map @ find-method perform ;
                    283: 
                    284: : search-wordlist ( c-addr count wid -- 0 | xt +-1 ) \ search
                    285:     \G Search the word list identified by @i{wid} for the definition
                    286:     \G named by the string at @i{c-addr count}.  If the definition is
                    287:     \G not found, return 0. If the definition is found return 1 (if
                    288:     \G the definition is immediate) or -1 (if the definition is not
                    289:     \G immediate) together with the @i{xt}.  In Gforth, the @i{xt}
                    290:     \G returned represents the interpretation semantics.  ANS Forth
                    291:     \G does not specify clearly what @i{xt} represents.
                    292:     (search-wordlist) dup if
                    293:        (name>intn)
                    294:     then ;
                    295: 
                    296: : find-name ( c-addr u -- nt | 0 ) \ gforth
                    297:     \g Find the name @i{c-addr u} in the current search
                    298:     \g order. Return its @i{nt}, if found, otherwise 0.
                    299:     lookup @ (search-wordlist) ;
                    300: [THEN]
                    301: 
1.1       pazsan    302: \ \ header, finding, ticks                              17dec92py
                    303: 
1.69      pazsan    304: \ The constants are defined as 32 bits, but then erased
                    305: \ and overwritten by the right ones
1.67      anton     306: 
1.103     pazsan    307: has? f83headerstring [IF]
                    308:     \ to save space, Gforth EC limits words to 31 characters
1.173     pazsan    309:     \ also, there's no predule concept in Gforth EC
1.103     pazsan    310:     $80 constant alias-mask
                    311:     $40 constant immediate-mask
                    312:     $20 constant restrict-mask
                    313:     $1f constant lcount-mask
1.169     anton     314: [ELSE]
                    315: \ 32-bit systems cannot generate large 64-bit constant in the
                    316: \ cross-compiler, so we kludge it by generating a constant and then
                    317: \ storing the proper value into it (and that's another kludge).
1.67      anton     318: $80000000 constant alias-mask
1.69      pazsan    319: 1 bits/char 1 - lshift
                    320: -1 cells allot  bigendian [IF]   c, 0 1 cells 1- times
                    321:                           [ELSE] 0 1 cells 1- times c, [THEN]
1.67      anton     322: $40000000 constant immediate-mask
1.69      pazsan    323: 1 bits/char 2 - lshift
                    324: -1 cells allot  bigendian [IF]   c, 0 1 cells 1- times
                    325:                           [ELSE] 0 1 cells 1- times c, [THEN]
1.67      anton     326: $20000000 constant restrict-mask
1.69      pazsan    327: 1 bits/char 3 - lshift
                    328: -1 cells allot  bigendian [IF]   c, 0 1 cells 1- times
                    329:                           [ELSE] 0 1 cells 1- times c, [THEN]
1.169     anton     330: $10000000 constant prelude-mask
                    331: 1 bits/char 4 - lshift
                    332: -1 cells allot  bigendian [IF]   c, 0 1 cells 1- times
                    333:                           [ELSE] 0 1 cells 1- times c, [THEN]
                    334: $0fffffff constant lcount-mask
                    335: 1 bits/char 4 - lshift 1 -
1.71      pazsan    336: -1 cells allot  bigendian [IF]   c, -1 1 cells 1- times
                    337:                           [ELSE] -1 1 cells 1- times c, [THEN]
1.103     pazsan    338: [THEN]
1.1       pazsan    339: 
                    340: \ higher level parts of find
                    341: 
                    342: : flag-sign ( f -- 1|-1 )
                    343:     \ true becomes 1, false -1
                    344:     0= 2* 1+ ;
                    345: 
1.79      anton     346: : ticking-compile-only-error ( ... -- )
                    347:     -&2048 throw ;
1.1       pazsan    348: 
1.93      anton     349: : compile-only-error ( ... -- )
                    350:     -&14 throw ;
                    351: 
1.1       pazsan    352: : (cfa>int) ( cfa -- xt )
                    353: [ has? compiler [IF] ]
                    354:     dup interpret/compile?
                    355:     if
                    356:        interpret/compile-int @
                    357:     then 
                    358: [ [THEN] ] ;
                    359: 
1.67      anton     360: : (x>int) ( cfa w -- xt )
1.1       pazsan    361:     \ get interpretation semantics of name
1.141     pazsan    362:     restrict-mask and [ has? rom [IF] ] 0= [ [THEN] ]
1.1       pazsan    363:     if
1.93      anton     364:        drop ['] compile-only-error
1.1       pazsan    365:     else
                    366:        (cfa>int)
                    367:     then ;
                    368: 
1.103     pazsan    369: has? f83headerstring [IF]
1.155     anton     370: : name>string ( nt -- addr count ) \ gforth     name-to-string
1.103     pazsan    371:     \g @i{addr count} is the name of the word represented by @i{nt}.
                    372:     cell+ count lcount-mask and ;
                    373: 
                    374: : ((name>))  ( nfa -- cfa )
                    375:     name>string + cfaligned ;
                    376: 
                    377: : (name>x) ( nfa -- cfa w )
                    378:     \ cfa is an intermediate cfa and w is the flags cell of nfa
                    379:     dup ((name>))
                    380:     swap cell+ c@ dup alias-mask and 0=
                    381:     IF
                    382:         swap @ swap
                    383:     THEN ;
                    384: [ELSE]
1.155     anton     385: : name>string ( nt -- addr count ) \ gforth     name-to-string
1.40      crook     386:     \g @i{addr count} is the name of the word represented by @i{nt}.
1.67      anton     387:     cell+ dup cell+ swap @ lcount-mask and ;
1.1       pazsan    388: 
                    389: : ((name>))  ( nfa -- cfa )
                    390:     name>string + cfaligned ;
                    391: 
1.67      anton     392: : (name>x) ( nfa -- cfa w )
                    393:     \ cfa is an intermediate cfa and w is the flags cell of nfa
1.1       pazsan    394:     dup ((name>))
1.67      anton     395:     swap cell+ @ dup alias-mask and 0=
1.1       pazsan    396:     IF
                    397:         swap @ swap
                    398:     THEN ;
1.103     pazsan    399: [THEN]
1.1       pazsan    400: 
1.155     anton     401: : name>int ( nt -- xt ) \ gforth name-to-int
1.31      crook     402:     \G @i{xt} represents the interpretation semantics of the word
                    403:     \G @i{nt}. If @i{nt} has no interpretation semantics (i.e. is
                    404:     \G @code{compile-only}), @i{xt} is the execution token for
1.79      anton     405:     \G @code{ticking-compile-only-error}, which performs @code{-2048 throw}.
1.1       pazsan    406:     (name>x) (x>int) ;
                    407: 
1.155     anton     408: : name?int ( nt -- xt ) \ gforth name-question-int
1.79      anton     409:     \G Like @code{name>int}, but perform @code{-2048 throw} if @i{nt}
1.31      crook     410:     \G has no interpretation semantics.
1.141     pazsan    411:     (name>x) restrict-mask and [ has? rom [IF] ] 0= [ [THEN] ]
1.1       pazsan    412:     if
1.79      anton     413:        ticking-compile-only-error \ does not return
1.1       pazsan    414:     then
                    415:     (cfa>int) ;
                    416: 
                    417: : (name>comp) ( nt -- w +-1 ) \ gforth
1.31      crook     418:     \G @i{w xt} is the compilation token for the word @i{nt}.
1.1       pazsan    419:     (name>x) >r 
                    420: [ has? compiler [IF] ]
                    421:     dup interpret/compile?
                    422:     if
                    423:         interpret/compile-comp @
                    424:     then 
                    425: [ [THEN] ]
1.141     pazsan    426:     r> immediate-mask and [ has? rom [IF] ] 0= [ [THEN] ] flag-sign
1.1       pazsan    427:     ;
                    428: 
                    429: : (name>intn) ( nfa -- xt +-1 )
1.67      anton     430:     (name>x) tuck (x>int) ( w xt )
1.141     pazsan    431:     swap immediate-mask and [ has? rom [IF] ] 0= [ [THEN] ] flag-sign ;
1.1       pazsan    432: 
1.173     pazsan    433: [IFDEF] prelude-mask
1.169     anton     434: : name>prelude ( nt -- xt )
                    435:     dup cell+ @ prelude-mask and if
                    436:        [ -1 cells ] literal + @
                    437:     else
                    438:        drop ['] noop
                    439:     then ;
1.173     pazsan    440: [THEN]
1.169     anton     441: 
1.72      pazsan    442: const Create ???  0 , 3 , char ? c, char ? c, char ? c,
1.30      jwilke    443: \ ??? is used by dovar:, must be created/:dovar
                    444: 
                    445: [IFDEF] forthstart
                    446: \ if we have a forthstart we can define head? with it
                    447: \ otherwise leave out the head? check
                    448: 
1.14      anton     449: : head? ( addr -- f )
1.82      anton     450: \G heuristic check whether addr is a name token; may deliver false
                    451: \G positives; addr must be a valid address; returns 1 for
                    452: \G particularly unsafe positives
1.14      anton     453:     \ we follow the link fields and check for plausibility; two
                    454:     \ iterations should catch most false addresses: on the first
                    455:     \ iteration, we may get an xt, on the second a code address (or
                    456:     \ some code), which is typically not in the dictionary.
1.82      anton     457:     \ we added a third iteration for working with code and ;code words.
                    458:     3 0 do
1.41      anton     459:        dup dup aligned <> if \ protect @ against unaligned accesses
                    460:            drop false unloop exit
                    461:        then
1.14      anton     462:        dup @ dup
                    463:        if ( addr addr1 )
                    464:            dup rot forthstart within
                    465:            if \ addr1 is outside forthstart..addr, not a head
                    466:                drop false unloop exit
                    467:            then ( addr1 )
                    468:        else \ 0 in the link field, no further checks
1.81      anton     469:            2drop 1 unloop exit \ this is very unsure, so return 1
1.14      anton     470:        then
                    471:     loop
                    472:     \ in dubio pro:
                    473:     drop true ;
                    474: 
1.48      anton     475: : >head-noprim ( cfa -- nt ) \ gforth  to-head-noprim
1.97      anton     476:     \ also heuristic
1.157     pazsan    477:     dup forthstart - max-name-length @
                    478:     [ has? float [IF] ] float+ [ [ELSE] ] cell+ [ [THEN] ] cell+ min
                    479:     cell max cell ?do ( cfa )
1.70      pazsan    480:        dup i - dup @ [ alias-mask lcount-mask or ] literal
                    481:        [ 1 bits/char 3 - lshift 1 - 1 bits/char 1 - lshift or
1.71      pazsan    482:        -1 cells allot bigendian [IF]   c, -1 1 cells 1- times
                    483:        [ELSE] -1 1 cells 1- times c, [THEN] ]
1.70      pazsan    484:        and ( cfa len|alias )
1.97      anton     485:        swap + cell+ cfaligned over alias-mask + =
1.14      anton     486:        if ( cfa )
                    487:            dup i - cell - dup head?
                    488:            if
                    489:                nip unloop exit
                    490:            then
                    491:            drop
                    492:        then
                    493:        cell +loop
                    494:     drop ??? ( wouldn't 0 be better? ) ;
1.1       pazsan    495: 
1.30      jwilke    496: [ELSE]
                    497: 
1.48      anton     498: : >head-noprim ( cfa -- nt ) \ gforth  to-head-noprim
1.45      pazsan    499:     $25 cell do ( cfa )
1.70      pazsan    500:        dup i - dup @ [ alias-mask lcount-mask or ] literal
                    501:        [ 1 bits/char 3 - lshift 1 - 1 bits/char 1 - lshift or
1.71      pazsan    502:        -1 cells allot bigendian [IF]   c, -1 1 cells 1- times
                    503:        [ELSE] -1 1 cells 1- times c, [THEN] ]
1.70      pazsan    504:        and ( cfa len|alias )
1.67      anton     505:        swap + cell + cfaligned over alias-mask + =
1.30      jwilke    506:        if ( cfa ) i - cell - unloop exit
                    507:        then
                    508:        cell +loop
                    509:     drop ??? ( wouldn't 0 be better? ) ;
                    510: 
                    511: [THEN]
1.1       pazsan    512: 
1.158     anton     513: cell% 2* 0 0 field >body ( xt -- a_addr ) \ core to-body
1.83      anton     514: \G Get the address of the body of the word represented by @i{xt} (the
                    515: \G address of the word's data field).
                    516: drop drop
                    517: 
                    518: cell% -2 * 0 0 field body> ( xt -- a_addr )
1.84      anton     519:     drop drop
                    520: 
                    521: has? standardthreading has? compiler and [IF]
                    522: 
                    523: ' @ alias >code-address ( xt -- c_addr ) \ gforth
                    524: \G @i{c-addr} is the code address of the word @i{xt}.
                    525: 
                    526: : >does-code ( xt -- a_addr ) \ gforth
                    527: \G If @i{xt} is the execution token of a child of a @code{DOES>} word,
                    528: \G @i{a-addr} is the start of the Forth code after the @code{DOES>};
                    529: \G Otherwise @i{a-addr} is 0.
                    530:     dup @ dodoes: = if
                    531:        cell+ @
                    532:     else
                    533:        drop 0
                    534:     endif ;
                    535: 
1.157     pazsan    536: has? prims [IF]
                    537:     : flash! ! ;
                    538:     : flashc! c! ;
                    539: [THEN]
                    540: 
1.142     pazsan    541: has? flash [IF] ' flash! [ELSE] ' ! [THEN]
                    542: alias code-address! ( c_addr xt -- ) \ gforth
1.85      anton     543: \G Create a code field with code address @i{c-addr} at @i{xt}.
                    544: 
1.176     anton     545: : any-code! ( a-addr cfa code-addr -- )
                    546:     \ for implementing DOES> and ;ABI-CODE, maybe :
                    547:     \ code-address is stored at cfa, a-addr at cfa+cell
                    548:     over ! cell+ ! ;
                    549:     
                    550: : does-code! ( a-addr xt -- ) \ gforth
1.85      anton     551: \G Create a code field at @i{xt} for a child of a @code{DOES>}-word;
                    552: \G @i{a-addr} is the start of the Forth code after @code{DOES>}.
1.142     pazsan    553:     [ has? flash [IF] ]
                    554:     dodoes: over flash! cell+ flash!
                    555:     [ [ELSE] ]
1.176     anton     556:     dodoes: any-code! 
1.142     pazsan    557:     [ [THEN] ] ;
1.85      anton     558: 
                    559: 2 cells constant /does-handler ( -- n ) \ gforth
                    560: \G The size of a @code{DOES>}-handler (includes possible padding).
                    561: 
1.84      anton     562: [THEN] 
1.1       pazsan    563: 
                    564: : sfind ( c-addr u -- 0 / xt +-1  ) \ gforth-obsolete
                    565:     find-name dup
                    566:     if ( nt )
                    567:        state @
                    568:        if
                    569:            (name>comp)
                    570:        else
                    571:            (name>intn)
                    572:        then
                    573:    then ;
                    574: 
1.31      crook     575: : find ( c-addr -- xt +-1 | c-addr 0 ) \ core,search
1.53      anton     576:     \G Search all word lists in the current search order for the
                    577:     \G definition named by the counted string at @i{c-addr}.  If the
                    578:     \G definition is not found, return 0. If the definition is found
                    579:     \G return 1 (if the definition has non-default compilation
                    580:     \G semantics) or -1 (if the definition has default compilation
                    581:     \G semantics).  The @i{xt} returned in interpret state represents
                    582:     \G the interpretation semantics.  The @i{xt} returned in compile
                    583:     \G state represented either the compilation semantics (for
                    584:     \G non-default compilation semantics) or the run-time semantics
                    585:     \G that the compilation semantics would @code{compile,} (for
                    586:     \G default compilation semantics).  The ANS Forth standard does
                    587:     \G not specify clearly what the returned @i{xt} represents (and
                    588:     \G also talks about immediacy instead of non-default compilation
                    589:     \G semantics), so this word is questionable in portable programs.
                    590:     \G If non-portability is ok, @code{find-name} and friends are
                    591:     \G better (@pxref{Name token}).
1.1       pazsan    592:     dup count sfind dup
                    593:     if
                    594:        rot drop
                    595:     then ;
                    596: 
1.34      jwilke    597: \ ticks in interpreter
1.1       pazsan    598: 
                    599: : (') ( "name" -- nt ) \ gforth
1.139     pazsan    600:     parse-name name-too-short?
1.28      anton     601:     find-name dup 0=
1.1       pazsan    602:     IF
1.42      anton     603:        drop -&13 throw
1.1       pazsan    604:     THEN  ;
                    605: 
                    606: : '    ( "name" -- xt ) \ core tick
1.31      crook     607:     \g @i{xt} represents @i{name}'s interpretation
                    608:     \g semantics. Perform @code{-14 throw} if the word has no
1.1       pazsan    609:     \g interpretation semantics.
                    610:     (') name?int ;
1.34      jwilke    611: 
                    612: has? compiler 0= [IF]  \ interpreter only version of IS and TO
                    613: 
                    614: : IS ' >body ! ;
                    615: ' IS Alias TO
                    616: 
                    617: [THEN]
1.1       pazsan    618: 
                    619: \ \ the interpreter loop                                 mar92py
                    620: 
                    621: \ interpret                                            10mar92py
                    622: 
1.120     anton     623: Defer parser1 ( c-addr u -- ... xt)
                    624: \ "... xt" is the action to be performed by the text-interpretation of c-addr u
                    625: 
                    626: : parser ( c-addr u -- ... )
                    627: \ text-interpret the word/number c-addr u, possibly producing a number
                    628:     parser1 execute ;
                    629: 
1.139     pazsan    630: has? ec [IF]
                    631:     ' (name) Alias parse-name
1.140     pazsan    632:     : no.extensions  2drop -&13 throw ;
1.139     pazsan    633:     ' no.extensions Alias compiler-notfound1
                    634:     ' no.extensions Alias interpreter-notfound1
                    635: [ELSE]    
1.119     anton     636: Defer parse-name ( "name" -- c-addr u ) \ gforth
1.55      anton     637: \G Get the next word from the input buffer
1.119     anton     638: ' (name) IS parse-name
1.77      anton     639: 
1.119     anton     640: ' parse-name alias parse-word ( -- c-addr u ) \ gforth-obsolete
                    641: \G old name for @code{parse-name}
                    642:     
                    643: ' parse-name alias name ( -- c-addr u ) \ gforth-obsolete
                    644: \G old name for @code{parse-name}
                    645:     
1.179     pazsan    646: : no.extensions  ( addr u -- )
                    647:     2drop -&13 throw ;
                    648: 
                    649: has? recognizer 0= [IF]
1.120     anton     650: Defer compiler-notfound1 ( c-addr count -- ... xt )
                    651: Defer interpreter-notfound1 ( c-addr count -- ... xt )
1.1       pazsan    652: 
1.120     anton     653: ' no.extensions IS compiler-notfound1
                    654: ' no.extensions IS interpreter-notfound1
1.179     pazsan    655: [THEN]
1.1       pazsan    656: 
1.106     anton     657: Defer before-word ( -- ) \ gforth
                    658: \ called before the text interpreter parses the next word
                    659: ' noop IS before-word
1.139     pazsan    660: [THEN]
1.106     anton     661: 
1.149     pazsan    662: has? backtrace [IF]
1.66      anton     663: : interpret1 ( ... -- ... )
1.24      anton     664:     rp@ backtrace-rp0 !
1.1       pazsan    665:     BEGIN
1.139     pazsan    666:        ?stack [ has? EC 0= [IF] ] before-word [ [THEN] ] parse-name dup
1.1       pazsan    667:     WHILE
1.120     anton     668:        parser1 execute
1.1       pazsan    669:     REPEAT
1.66      anton     670:     2drop ;
                    671:     
                    672: : interpret ( ?? -- ?? ) \ gforth
                    673:     \ interpret/compile the (rest of the) input buffer
                    674:     backtrace-rp0 @ >r 
                    675:     ['] interpret1 catch
1.65      anton     676:     r> backtrace-rp0 !
1.154     pazsan    677:     throw ;
1.149     pazsan    678: [ELSE]
                    679: : interpret ( ... -- ... )
                    680:     BEGIN
                    681:        ?stack [ has? EC 0= [IF] ] before-word [ [THEN] ] parse-name dup
                    682:     WHILE
                    683:        parser1 execute
                    684:     REPEAT
                    685:     2drop ;
                    686: [THEN]
1.1       pazsan    687: 
                    688: \ interpreter                                  30apr92py
                    689: 
1.173     pazsan    690: [IFDEF] prelude-mask
1.171     anton     691: : run-prelude ( nt|0 -- nt|0 )
                    692:     \ run the prelude of the name identified by nt (if present).  This
                    693:     \ is used in the text interpreter and similar stuff.
                    694:     dup if
                    695:        dup name>prelude execute
                    696:     then ;
1.173     pazsan    697: [THEN]
1.171     anton     698: 
1.178     pazsan    699: has? recognizer 0= [IF]
1.1       pazsan    700: \ not the most efficient implementations of interpreter and compiler
1.120     anton     701: : interpreter1 ( c-addr u -- ... xt ) 
1.173     pazsan    702:     2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
1.1       pazsan    703:     if
1.120     anton     704:        nip nip name>int
1.1       pazsan    705:     else
                    706:        drop
                    707:        2dup 2>r snumber?
                    708:        IF
1.120     anton     709:            2rdrop ['] noop
1.1       pazsan    710:        ELSE
1.120     anton     711:            2r> interpreter-notfound1
1.1       pazsan    712:        THEN
                    713:     then ;
                    714: 
1.120     anton     715: ' interpreter1  IS  parser1
1.178     pazsan    716: [THEN]
1.1       pazsan    717: 
                    718: \ \ Query Evaluate                                     07apr93py
                    719: 
                    720: has? file 0= [IF]
1.12      pazsan    721: : sourceline# ( -- n )  1 ;
1.61      pazsan    722: [ELSE]
1.64      pazsan    723: has? new-input 0= [IF]
1.58      pazsan    724: Variable #fill-bytes
                    725: \G number of bytes read via (read-line) by the last refill
1.61      pazsan    726: [THEN]
1.64      pazsan    727: [THEN]
1.58      pazsan    728: 
1.64      pazsan    729: has? new-input 0= [IF]
1.138     pazsan    730: : input-start-line ( -- )  >in off ;
1.1       pazsan    731: : refill ( -- flag ) \ core-ext,block-ext,file-ext
1.29      crook     732:     \G Attempt to fill the input buffer from the input source.  When
                    733:     \G the input source is the user input device, attempt to receive
                    734:     \G input into the terminal input device. If successful, make the
                    735:     \G result the input buffer, set @code{>IN} to 0 and return true;
                    736:     \G otherwise return false. When the input source is a block, add 1
                    737:     \G to the value of @code{BLK} to make the next block the input
                    738:     \G source and current input buffer, and set @code{>IN} to 0;
                    739:     \G return true if the new value of @code{BLK} is a valid block
                    740:     \G number, false otherwise. When the input source is a text file,
                    741:     \G attempt to read the next line from the file. If successful,
                    742:     \G make the result the current input buffer, set @code{>IN} to 0
                    743:     \G and return true; otherwise, return false.  A successful result
                    744:     \G includes receipt of a line containing 0 characters.
1.12      pazsan    745:     [ has? file [IF] ]
1.138     pazsan    746:        blk @  IF  1 blk +!  true  EXIT  THEN
1.12      pazsan    747:        [ [THEN] ]
                    748:     tib /line
                    749:     [ has? file [IF] ]
                    750:        loadfile @ ?dup
1.59      pazsan    751:        IF    (read-line) throw #fill-bytes !
1.12      pazsan    752:        ELSE
                    753:            [ [THEN] ]
                    754:        sourceline# 0< IF 2drop false EXIT THEN
1.145     pazsan    755:        accept eof @ 0=
1.12      pazsan    756:        [ has? file [IF] ]
                    757:        THEN
                    758:        1 loadline +!
                    759:        [ [THEN] ]
1.138     pazsan    760:     swap #tib !
                    761:     input-start-line ;
1.1       pazsan    762: 
                    763: : query   ( -- ) \ core-ext
1.29      crook     764:     \G Make the user input device the input source. Receive input into
                    765:     \G the Terminal Input Buffer. Set @code{>IN} to zero. OBSOLESCENT:
                    766:     \G superceeded by @code{accept}.
1.12      pazsan    767:     [ has? file [IF] ]
                    768:        blk off loadfile off
                    769:        [ [THEN] ]
1.64      pazsan    770:     refill drop ;
                    771: [THEN]
1.1       pazsan    772: 
                    773: \ save-mem extend-mem
                    774: 
                    775: has? os [IF]
                    776: : save-mem     ( addr1 u -- addr2 u ) \ gforth
                    777:     \g copy a memory block into a newly allocated region in the heap
                    778:     swap >r
                    779:     dup allocate throw
                    780:     swap 2dup r> -rot move ;
                    781: 
1.68      anton     782: : free-mem-var ( addr -- )
                    783:     \ addr is the address of a 2variable containing address and size
                    784:     \ of a memory range; frees memory and clears the 2variable.
                    785:     dup 2@ drop dup
                    786:     if ( addr mem-start )
                    787:        free throw
                    788:        0 0 rot 2!
                    789:     else
                    790:        2drop
                    791:     then ;
                    792: 
1.1       pazsan    793: : extend-mem   ( addr1 u1 u -- addr addr2 u2 )
                    794:     \ extend memory block allocated from the heap by u aus
1.105     anton     795:     \ the (possibly reallocated) piece is addr2 u2, the extension is at addr
1.1       pazsan    796:     over >r + dup >r resize throw
                    797:     r> over r> + -rot ;
                    798: [THEN]
                    799: 
                    800: \ EVALUATE                                              17may93jaw
                    801: 
1.64      pazsan    802: has? file 0= has? new-input 0= and [IF]
1.1       pazsan    803: : push-file  ( -- )  r>
1.12      pazsan    804:   tibstack @ >r  >tib @ >r  #tib @ >r
1.1       pazsan    805:   >tib @ tibstack @ = IF  r@ tibstack +!  THEN
                    806:   tibstack @ >tib ! >in @ >r  >r ;
                    807: 
                    808: : pop-file   ( throw-code -- throw-code )
                    809:   r>
1.12      pazsan    810:   r> >in !  r> #tib !  r> >tib !  r> tibstack !  >r ;
1.1       pazsan    811: [THEN]
                    812: 
1.64      pazsan    813: has? new-input 0= [IF]
1.29      crook     814: : evaluate ( c-addr u -- ) \ core,block
1.40      crook     815:     \G Save the current input source specification. Store @code{-1} in
                    816:     \G @code{source-id} and @code{0} in @code{blk}. Set @code{>IN} to
                    817:     \G @code{0} and make the string @i{c-addr u} the input source
                    818:     \G and input buffer. Interpret. When the parse area is empty,
                    819:     \G restore the input source specification.
1.64      pazsan    820: [ has? file [IF] ]
1.92      anton     821:     s" *evaluated string*" loadfilename>r
1.64      pazsan    822: [ [THEN] ]
1.40      crook     823:     push-file #tib ! >tib !
1.130     anton     824:     input-start-line
1.29      crook     825:     [ has? file [IF] ]
                    826:        blk off loadfile off -1 loadline !
                    827:        [ [THEN] ]
                    828:     ['] interpret catch
1.56      anton     829:     pop-file
1.64      pazsan    830: [ has? file [IF] ]
1.92      anton     831:     r>loadfilename
1.64      pazsan    832: [ [THEN] ]
1.56      anton     833:     throw ;
1.64      pazsan    834: [THEN]
1.1       pazsan    835: 
                    836: \ \ Quit                                               13feb93py
                    837: 
                    838: Defer 'quit
                    839: 
1.156     pazsan    840: has? os [IF]
1.157     pazsan    841:     Defer .status
                    842: [ELSE]
1.164     pazsan    843:     [IFUNDEF] bye
                    844:        : (bye)     ( 0 -- ) \ back to DOS
                    845:            drop 5 emit ;
                    846:        
                    847:        : bye ( -- )  0 (bye) ;
                    848:     [THEN]
1.149     pazsan    849: [THEN]
1.1       pazsan    850: 
                    851: : prompt        state @ IF ."  compiled" EXIT THEN ."  ok" ;
                    852: 
1.39      anton     853: : (quit) ( -- )
                    854:     \ exits only through THROW etc.
                    855:     BEGIN
1.149     pazsan    856:        [ has? ec [IF] ] cr [ [ELSE] ]
                    857:        .status ['] cr catch if
1.144     pazsan    858:            [ has? OS [IF] ] >stderr [ [THEN] ]
                    859:            cr ." Can't print to stdout, leaving" cr
1.98      anton     860:            \ if stderr does not work either, already DoError causes a hang
                    861:            2 (bye)
1.149     pazsan    862:        endif [ [THEN] ]
1.138     pazsan    863:        refill  WHILE
1.122     anton     864:            interpret prompt
                    865:     REPEAT
                    866:     bye ;
1.1       pazsan    867: 
                    868: ' (quit) IS 'quit
                    869: 
                    870: \ \ DOERROR (DOERROR)                                  13jun93jaw
                    871: 
1.156     pazsan    872: has? os [IF]
1.1       pazsan    873: 8 Constant max-errors
1.130     anton     874: 5 has? file 2 and + Constant /error
1.1       pazsan    875: Variable error-stack  0 error-stack !
1.112     pazsan    876: max-errors /error * cells allot
1.1       pazsan    877: \ format of one cell:
1.133     anton     878: \ source ( c-addr u )
                    879: \ last parsed lexeme ( c-addr u )
1.1       pazsan    880: \ line-number
                    881: \ Loadfilename ( addr u )
                    882: 
1.133     anton     883: : error> ( --  c-addr1 u1 c-addr2 u2 line# [addr u] )
1.64      pazsan    884:     -1 error-stack +!
                    885:     error-stack dup @
1.112     pazsan    886:     /error * cells + cell+
                    887:     /error cells bounds DO
1.130     anton     888:         I @
                    889:     cell +LOOP ;
                    890: 
1.133     anton     891: : >error ( c-addr1 u1 c-addr2 u2 line# [addr u] -- )
1.64      pazsan    892:     error-stack dup @ dup 1+
                    893:     max-errors 1- min error-stack !
1.112     pazsan    894:     /error * cells + cell+
                    895:     /error 1- cells bounds swap DO
1.130     anton     896:         I !
                    897:     -1 cells +LOOP ;
                    898: 
1.133     anton     899: : input-error-data ( -- c-addr1 u1 c-addr2 u2 line# [addr u] )
1.130     anton     900:     \ error data for the current input, to be used by >error or .error-frame
1.181   ! pazsan    901:     source over >r save-mem over r> -
        !           902:     input-lexeme 2@ >r + r> sourceline#
1.130     anton     903:     [ has? file [IF] ] sourcefilename [ [THEN] ] ;
1.64      pazsan    904: 
1.1       pazsan    905: : dec. ( n -- ) \ gforth
1.40      crook     906:     \G Display @i{n} as a signed decimal number, followed by a space.
                    907:     \ !! not used...
1.1       pazsan    908:     base @ decimal swap . base ! ;
                    909: 
1.111     anton     910: : dec.r ( u n -- ) \ gforth
                    911:     \G Display @i{u} as a unsigned decimal number in a field @i{n}
                    912:     \G characters wide.
                    913:     base @ >r decimal .r r> base ! ;
1.23      jwilke    914: 
1.1       pazsan    915: : hex. ( u -- ) \ gforth
1.40      crook     916:     \G Display @i{u} as an unsigned hex number, prefixed with a "$" and
1.17      crook     917:     \G followed by a space.
1.40      crook     918:     \ !! not used...
1.33      jwilke    919:     [char] $ emit base @ swap hex u. base ! ;
1.1       pazsan    920: 
1.94      anton     921: : -trailing  ( c_addr u1 -- c_addr u2 ) \ string dash-trailing
                    922: \G Adjust the string specified by @i{c-addr, u1} to remove all
                    923: \G trailing spaces. @i{u2} is the length of the modified string.
                    924:     BEGIN
1.102     pazsan    925:        dup
1.94      anton     926:     WHILE
1.102     pazsan    927:        1- 2dup + c@ bl <>
                    928:     UNTIL  1+  THEN ;
1.94      anton     929: 
1.1       pazsan    930: DEFER DOERROR
1.33      jwilke    931: 
                    932: has? backtrace [IF]
1.15      anton     933: Defer dobacktrace ( -- )
                    934: ' noop IS dobacktrace
1.33      jwilke    935: [THEN]
1.1       pazsan    936: 
1.23      jwilke    937: : .error-string ( throw-code -- )
                    938:   dup -2 = 
                    939:   IF   "error @ ?dup IF count type  THEN drop
                    940:   ELSE .error
                    941:   THEN ;
                    942: 
1.111     anton     943: : umin ( u1 u2 -- u )
                    944:     2dup u>
                    945:     if
                    946:        swap
                    947:     then
                    948:     drop ;
                    949: 
1.112     pazsan    950: Defer mark-start
                    951: Defer mark-end
                    952: 
                    953: :noname ." >>>" ; IS mark-start
                    954: :noname ." <<<" ; IS mark-end
                    955: 
1.130     anton     956: : part-type ( addr1 u1 u -- addr2 u2 )
                    957:     \ print first u characters of addr1 u1, addr2 u2 is the rest
1.133     anton     958:     over umin 2 pick over type /string ;
1.130     anton     959: 
1.133     anton     960: : .error-line ( c-addr1 u1 c-addr2 u2 -- )
                    961:     \ print error in line c-addr1 u1, where the error-causing lexeme
                    962:     \ is c-addr2 u2
                    963:     >r 2 pick - part-type ( c-addr3 u3 R: u2 )
                    964:     mark-start r> part-type mark-end ( c-addr4 u4 )
                    965:     type ;
1.130     anton     966: 
1.133     anton     967: : .error-frame ( throwcode addr1 u1 addr2 u2 n2 [addr3 u3] -- throwcode )
                    968:     \ addr3 u3: filename of included file - optional
1.130     anton     969:     \ n2:       line number
1.133     anton     970:     \ addr2 u2: parsed lexeme (should be marked as causing the error)
1.130     anton     971:     \ addr1 u1: input line
                    972:     error-stack @
                    973:     IF ( throwcode addr1 u1 n0 n1 n2 [addr2 u2] )
                    974:         [ has? file [IF] ] \ !! unbalanced stack effect
1.129     pazsan    975:          over IF
                    976:              cr ." in file included from "
                    977:              type ." :"
1.130     anton     978:              0 dec.r  2drop 2drop
                    979:           ELSE
                    980:               2drop 2drop 2drop drop
                    981:           THEN
                    982:           [ [THEN] ] ( throwcode addr1 u1 n0 n1 n2 )
                    983:     ELSE ( throwcode addr1 u1 n0 n1 n2 [addr2 u2] )
                    984:         [ has? file [IF] ]
                    985:             cr type ." :"
                    986:             [ [THEN] ] ( throwcode addr1 u1 n0 n1 n2 )
                    987:         dup 0 dec.r ." : " 5 pick .error-string
                    988:         IF \ if line# non-zero, there is a line
                    989:             cr .error-line
                    990:         ELSE
                    991:             2drop 2drop
                    992:         THEN
                    993:     THEN ;
1.1       pazsan    994: 
                    995: : (DoError) ( throw-code -- )
                    996:   [ has? os [IF] ]
1.8       pazsan    997:       >stderr
1.1       pazsan    998:   [ [THEN] ] 
1.130     anton     999:   input-error-data .error-frame
1.1       pazsan   1000:   error-stack @ 0 ?DO
1.64      pazsan   1001:     error>
1.1       pazsan   1002:     .error-frame
                   1003:   LOOP
1.33      jwilke   1004:   drop 
                   1005: [ has? backtrace [IF] ]
                   1006:   dobacktrace
                   1007: [ [THEN] ]
1.8       pazsan   1008:   normal-dp dpp ! ;
1.1       pazsan   1009: 
                   1010: ' (DoError) IS DoError
1.131     pazsan   1011: 
                   1012: [ELSE]
                   1013:     : dec.  base @ >r decimal . r> base ! ;
1.144     pazsan   1014:     : DoError ( throw-code -- )
1.145     pazsan   1015:        cr source drop >in @ type ." <<< "
1.144     pazsan   1016:        dup -2 =  IF  "error @ type  drop  EXIT  THEN
                   1017:        .error ;
1.131     pazsan   1018: [THEN]
1.1       pazsan   1019: 
                   1020: : quit ( ?? -- ?? ) \ core
1.27      crook    1021:     \G Empty the return stack, make the user input device
                   1022:     \G the input source, enter interpret state and start
                   1023:     \G the text interpreter.
1.64      pazsan   1024:     rp0 @ rp! handler off clear-tibstack
                   1025:     [ has? new-input 0= [IF] ] >tib @ >r [ [THEN] ]
1.1       pazsan   1026:     BEGIN
                   1027:        [ has? compiler [IF] ]
1.104     anton    1028:            [compile] [
1.1       pazsan   1029:        [ [THEN] ]
1.104     anton    1030:        \ stack depths may be arbitrary here
1.1       pazsan   1031:        ['] 'quit CATCH dup
                   1032:     WHILE
1.104     anton    1033:            <# \ reset hold area, or we may get another error
                   1034:            DoError
                   1035:            \ stack depths may be arbitrary still (or again), so clear them
                   1036:            clearstacks
                   1037:            [ has? new-input [IF] ] clear-tibstack
                   1038:            [ [ELSE] ] r@ >tib ! r@ tibstack !
                   1039:            [ [THEN] ]
1.1       pazsan   1040:     REPEAT
1.64      pazsan   1041:     drop [ has? new-input [IF] ] clear-tibstack
                   1042:     [ [ELSE] ] r> >tib !
                   1043:     [ [THEN] ] ;
1.1       pazsan   1044: 
                   1045: \ \ Cold Boot                                          13feb93py
                   1046: 
1.158     anton    1047: : (bootmessage) ( -- )
1.101     anton    1048:     ." Gforth " version-string type 
1.180     pazsan   1049:     ." , Copyright (C) 1995-2011 Free Software Foundation, Inc." cr
1.101     anton    1050:     ." Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'"
1.1       pazsan   1051: [ has? os [IF] ]
                   1052:      cr ." Type `bye' to exit"
                   1053: [ [THEN] ] ;
                   1054: 
1.158     anton    1055: defer bootmessage ( -- ) \ gforth
1.150     anton    1056: \G Hook (deferred word) executed right after interpreting the OS
                   1057: \G command-line arguments.  Normally prints the Gforth startup
                   1058: \G message.
                   1059: 
1.135     pazsan   1060: has? file [IF]
1.1       pazsan   1061: defer process-args
1.135     pazsan   1062: [THEN]
1.1       pazsan   1063: 
                   1064: ' (bootmessage) IS bootmessage
                   1065: 
1.156     pazsan   1066: has? os [IF]
1.10      anton    1067: Defer 'cold ( -- ) \ gforth  tick-cold
1.150     anton    1068: \G Hook (deferred word) for things to do right before interpreting the
                   1069: \G OS command-line arguments.  Normally does some initializations that
                   1070: \G you also want to perform.
1.1       pazsan   1071: ' noop IS 'cold
1.148     pazsan   1072: [THEN]
1.1       pazsan   1073: 
                   1074: : cold ( -- ) \ gforth
1.149     pazsan   1075: [ has? backtrace [IF] ]
1.44      anton    1076:     rp@ backtrace-rp0 !
                   1077: [ [THEN] ]
1.1       pazsan   1078: [ has? file [IF] ]
1.78      pazsan   1079:     os-cold
1.1       pazsan   1080: [ [THEN] ]
1.156     pazsan   1081: [ has? os [IF] ]
1.116     anton    1082:     set-encoding-fixed-width
1.136     pazsan   1083:     'cold
1.126     pazsan   1084: [ [THEN] ]
1.1       pazsan   1085: [ has? file [IF] ]
1.8       pazsan   1086:     process-args
1.12      pazsan   1087:     loadline off
1.1       pazsan   1088: [ [THEN] ]
                   1089:     bootmessage
1.12      pazsan   1090:     quit ;
1.1       pazsan   1091: 
1.64      pazsan   1092: has? new-input 0= [IF]
1.5       anton    1093: : clear-tibstack ( -- )
                   1094: [ has? glocals [IF] ]
                   1095:     lp@ forthstart 7 cells + @ - 
                   1096: [ [ELSE] ]
                   1097:     [ has? os [IF] ]
1.8       pazsan   1098:     r0 @ forthstart 6 cells + @ -
1.5       anton    1099:     [ [ELSE] ]
1.139     pazsan   1100:     sp@ cell+
1.5       anton    1101:     [ [THEN] ]
                   1102: [ [THEN] ]
1.138     pazsan   1103:     dup >tib ! tibstack ! #tib off
                   1104:     input-start-line ;
1.64      pazsan   1105: [THEN]
1.5       anton    1106: 
1.64      pazsan   1107: : boot ( path n **argv argc -- )
1.134     pazsan   1108: [ has? no-userspace 0= [IF] ]
1.1       pazsan   1109:     main-task up!
1.134     pazsan   1110: [ [THEN] ]
1.1       pazsan   1111: [ has? os [IF] ]
1.78      pazsan   1112:     os-boot
1.134     pazsan   1113: [ [THEN] ]
                   1114: [ has? rom [IF] ]
1.147     pazsan   1115:     ram-shadow dup @ dup -1 <> >r u> r> and IF
                   1116:        ram-shadow 2@  ELSE
                   1117:        ram-mirror ram-size  THEN  ram-start swap move
1.1       pazsan   1118: [ [THEN] ]
                   1119:     sp@ sp0 !
1.74      pazsan   1120: [ has? peephole [IF] ]
1.87      anton    1121:     \ only needed for greedy static superinstruction selection
                   1122:     \ primtable prepare-peephole-table TO peeptable
1.74      pazsan   1123: [ [THEN] ]
1.64      pazsan   1124: [ has? new-input [IF] ]
                   1125:     current-input off
                   1126: [ [THEN] ]
1.5       anton    1127:     clear-tibstack
1.127     anton    1128:     0 0 includefilename 2!
1.1       pazsan   1129:     rp@ rp0 !
                   1130: [ has? floating [IF] ]
                   1131:     fp@ fp0 !
                   1132: [ [THEN] ]
1.156     pazsan   1133: [ has? os [IF] ]
1.46      anton    1134:     handler off
1.98      anton    1135:     ['] cold catch dup -&2049 <> if \ broken pipe?
                   1136:        DoError cr
                   1137:     endif
1.149     pazsan   1138: [ [ELSE] ]
                   1139:     cold
                   1140: [ [THEN] ]
1.1       pazsan   1141: [ has? os [IF] ]
1.35      anton    1142:     1 (bye) \ !! determin exit code from throw code?
1.1       pazsan   1143: [ [THEN] ]
                   1144: ;
                   1145: 
                   1146: has? os [IF]
                   1147: : bye ( -- ) \ tools-ext
                   1148: [ has? file [IF] ]
                   1149:     script? 0= IF  cr  THEN
                   1150: [ [ELSE] ]
                   1151:     cr
                   1152: [ [THEN] ]
                   1153:     0 (bye) ;
                   1154: [THEN]
                   1155: 
                   1156: \ **argv may be scanned by the C starter to get some important
                   1157: \ information, as -display and -geometry for an X client FORTH
                   1158: \ or space and stackspace overrides
                   1159: 
                   1160: \ 0 arg contains, however, the name of the program.
                   1161: 

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>