File:  [gforth] / gforth / kernel / comp.fs
Revision 1.33: download - view: text, annotated - select for diffs
Sun Jan 28 22:43:39 2001 UTC (23 years, 2 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Fixed cell-size dependent masks

    1: \ compiler definitions						14sep97jaw
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998,2000 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ \ Revisions-Log
   22: 
   23: \	put in seperate file				14sep97jaw	
   24: 
   25: \ \ here allot , c, A,						17dec92py
   26: 
   27: [IFUNDEF] allot
   28: [IFUNDEF] forthstart
   29: : allot ( n -- ) \ core
   30:     dup unused u> -8 and throw
   31:     dp +! ;
   32: [THEN]
   33: [THEN]
   34: 
   35: \ we default to this version if we have nothing else 05May99jaw
   36: [IFUNDEF] allot
   37: : allot ( n -- ) \ core
   38:     \G Reserve @i{n} address units of data space without
   39:     \G initialization. @i{n} is a signed number, passing a negative
   40:     \G @i{n} releases memory.  In ANS Forth you can only deallocate
   41:     \G memory from the current contiguous region in this way.  In
   42:     \G Gforth you can deallocate anything in this way but named words.
   43:     \G The system does not check this restriction.
   44:     here +
   45:     dup 1- usable-dictionary-end forthstart within -8 and throw
   46:     dp ! ;
   47: [THEN]
   48: 
   49: : c,    ( c -- ) \ core c-comma
   50:     \G Reserve data space for one char and store @i{c} in the space.
   51:     here 1 chars allot c! ;
   52: 
   53: : ,     ( w -- ) \ core comma
   54:     \G Reserve data space for one cell and store @i{w} in the space.
   55:     here cell allot  ! ;
   56: 
   57: : 2,	( w1 w2 -- ) \ gforth
   58:     \G Reserve data space for two cells and store the double @i{w1
   59:     \G w2} there, @i{w2} first (lower address).
   60:     here 2 cells allot 2! ;
   61: 
   62: \ : aligned ( addr -- addr' ) \ core
   63: \     [ cell 1- ] Literal + [ -1 cells ] Literal and ;
   64: 
   65: : align ( -- ) \ core
   66:     \G If the data-space pointer is not aligned, reserve enough space to align it.
   67:     here dup aligned swap ?DO  bl c,  LOOP ;
   68: 
   69: \ : faligned ( addr -- f-addr ) \ float f-aligned
   70: \     [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ; 
   71: 
   72: : falign ( -- ) \ float f-align
   73:     \G If the data-space pointer is not float-aligned, reserve
   74:     \G enough space to align it.
   75:     here dup faligned swap
   76:     ?DO
   77: 	bl c,
   78:     LOOP ;
   79: 
   80: : maxalign ( -- ) \ gforth
   81:     \G Align data-space pointer for all alignment requirements.
   82:     here dup maxaligned swap
   83:     ?DO
   84: 	bl c,
   85:     LOOP ;
   86: 
   87: \ the code field is aligned if its body is maxaligned
   88: ' maxalign Alias cfalign ( -- ) \ gforth
   89: \G Align data-space pointer for code field requirements (i.e., such
   90: \G that the corresponding body is maxaligned).
   91: 
   92: ' , alias A, ( addr -- ) \ gforth
   93: 
   94: ' NOOP ALIAS const
   95: 
   96: \ \ Header							23feb93py
   97: 
   98: \ input-stream, nextname and noname are quite ugly (passing
   99: \ information through global variables), but they are useful for dealing
  100: \ with existing/independent defining words
  101: 
  102: defer (header)
  103: defer header ( -- ) \ gforth
  104: ' (header) IS header
  105: 
  106: : string, ( c-addr u -- ) \ gforth
  107:     \G puts down string as cstring
  108:     dup c, here swap chars dup allot move ;
  109: 
  110: : longstring, ( c-addr u -- ) \ gforth
  111:     \G puts down string as cstring
  112:     dup , here swap chars dup allot move ;
  113: 
  114: : header, ( c-addr u -- ) \ gforth
  115:     name-too-long?
  116:     align here last !
  117:     current @ 1 or A,	\ link field; before revealing, it contains the
  118: 			\ tagged reveal-into wordlist
  119:     longstring, cfalign
  120:     alias-mask lastflags cset ;
  121: 
  122: : input-stream-header ( "name" -- )
  123:     name name-too-short? header, ;
  124: 
  125: : input-stream ( -- )  \ general
  126:     \G switches back to getting the name from the input stream ;
  127:     ['] input-stream-header IS (header) ;
  128: 
  129: ' input-stream-header IS (header)
  130: 
  131: 2variable nextname-string
  132: 
  133: has? OS [IF]
  134: : nextname-header ( -- )
  135:     nextname-string 2@ header,
  136:     nextname-string free-mem-var
  137:     input-stream ;
  138: [THEN]
  139: 
  140: \ the next name is given in the string
  141: 
  142: has? OS [IF]
  143: : nextname ( c-addr u -- ) \ gforth
  144:     \g The next defined word will have the name @var{c-addr u}; the
  145:     \g defining word will leave the input stream alone.
  146:     name-too-long?
  147:     nextname-string free-mem-var
  148:     save-mem nextname-string 2!
  149:     ['] nextname-header IS (header) ;
  150: [THEN]
  151: 
  152: : noname-header ( -- )
  153:     0 last ! cfalign
  154:     input-stream ;
  155: 
  156: : noname ( -- ) \ gforth
  157:     \g The next defined word will be anonymous. The defining word will
  158:     \g leave the input stream alone. The xt of the defined word will
  159:     \g be given by @code{lastxt}.
  160:     ['] noname-header IS (header) ;
  161: 
  162: : lastxt ( -- xt ) \ gforth
  163:     \G @i{xt} is the execution token of the last word defined.
  164:     \ The main purpose of this word is to get the xt of words defined using noname
  165:     lastcfa @ ;
  166: 
  167: \ \ literals							17dec92py
  168: 
  169: : Literal  ( compilation n -- ; run-time -- n ) \ core
  170:     \G Compilation semantics: compile the run-time semantics.@*
  171:     \G Run-time Semantics: push @i{n}.@*
  172:     \G Interpretation semantics: undefined.
  173: [ [IFDEF] lit, ]
  174:     lit,
  175: [ [ELSE] ]
  176:     postpone lit ,
  177: [ [THEN] ] ; immediate restrict
  178: 
  179: : ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
  180: [ [IFDEF] alit, ]
  181:     alit,
  182: [ [ELSE] ]
  183:     postpone lit A, 
  184: [ [THEN] ] ; immediate restrict
  185: 
  186: : char   ( '<spaces>ccc' -- c ) \ core
  187:     \G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
  188:     \G display code representing the first character of @i{ccc}.
  189:     bl word char+ c@ ;
  190: 
  191: : [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
  192:     \G Compilation: skip leading spaces. Parse the string
  193:     \G @i{ccc}. Run-time: return @i{c}, the display code
  194:     \G representing the first character of @i{ccc}.  Interpretation
  195:     \G semantics for this word are undefined.
  196:     char postpone Literal ; immediate restrict
  197: 
  198: \ \ threading							17mar93py
  199: 
  200: : cfa,     ( code-address -- )  \ gforth	cfa-comma
  201:     here
  202:     dup lastcfa !
  203:     0 A, 0 ,  code-address! ;
  204: 
  205: [IFUNDEF] compile,
  206: : compile, ( xt -- )	\ core-ext	compile-comma
  207:     \G  Compile the word represented by the execution token @i{xt}
  208:     \G  into the current definition.
  209:     A, ;
  210: [THEN]
  211: 
  212: : !does    ( addr -- ) \ gforth	store-does
  213:     lastxt does-code! ;
  214: 
  215: : (does>)  ( R: addr -- )
  216:     r> cfaligned /does-handler + !does ;
  217: 
  218: : dodoes,  ( -- )
  219:   cfalign here /does-handler allot does-handler! ;
  220: 
  221: : (compile) ( -- ) \ gforth
  222:     r> dup cell+ >r @ compile, ;
  223: 
  224: \ \ ticks
  225: 
  226: : name>comp ( nt -- w xt ) \ gforth
  227:     \G @i{w xt} is the compilation token for the word @i{nt}.
  228:     (name>comp)
  229:     1 = if
  230:         ['] execute
  231:     else
  232:         ['] compile,
  233:     then ;
  234: 
  235: : [(')]  ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
  236:     (') postpone ALiteral ; immediate restrict
  237: 
  238: : [']  ( compilation. "name" -- ; run-time. -- xt ) \ core      bracket-tick
  239:     \g @i{xt} represents @i{name}'s interpretation
  240:     \g semantics. Perform @code{-14 throw} if the word has no
  241:     \g interpretation semantics.
  242:     ' postpone ALiteral ; immediate restrict
  243: 
  244: : COMP'    ( "name" -- w xt ) \ gforth  comp-tick
  245:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
  246:     (') name>comp ;
  247: 
  248: : [COMP']  ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
  249:     \g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
  250:     COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
  251: 
  252: : postpone, ( w xt -- ) \ gforth	postpone-comma
  253:     \g Compile the compilation semantics represented by the
  254:     \g compilation token @i{w xt}.
  255:     dup ['] execute =
  256:     if
  257: 	drop compile,
  258:     else
  259: 	dup ['] compile, =
  260: 	if
  261: 	    drop POSTPONE (compile) a,
  262: 	else
  263: 	    swap POSTPONE aliteral compile,
  264: 	then
  265:     then ;
  266: 
  267: : POSTPONE ( "name" -- ) \ core
  268:     \g Compiles the compilation semantics of @i{name}.
  269:     COMP' postpone, ; immediate restrict
  270: 
  271: \ \ recurse							17may93jaw
  272: 
  273: : recurse ( compilation -- ; run-time ?? -- ?? ) \ core
  274:     \g Call the current definition.
  275:     lastxt compile, ; immediate restrict
  276: 
  277: \ \ compiler loop
  278: 
  279: : compiler ( c-addr u -- )
  280:     2dup find-name dup
  281:     if ( c-addr u nt )
  282: 	nip nip name>comp execute
  283:     else
  284: 	drop
  285: 	2dup snumber? dup
  286: 	IF
  287: 	    0>
  288: 	    IF
  289: 		swap postpone Literal
  290: 	    THEN
  291: 	    postpone Literal
  292: 	    2drop
  293: 	ELSE
  294: 	    drop compiler-notfound
  295: 	THEN
  296:     then ;
  297: 
  298: : [ ( -- ) \  core	left-bracket
  299:     \G Enter interpretation state. Immediate word.
  300:     ['] interpreter  IS parser state off ; immediate
  301: 
  302: : ] ( -- ) \ core	right-bracket
  303:     \G Enter compilation state.
  304:     ['] compiler     IS parser state on  ;
  305: 
  306: \ \ Strings							22feb93py
  307: 
  308: : ," ( "string"<"> -- ) [char] " parse
  309:   here over char+ allot  place align ;
  310: 
  311: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
  312:     \G Compilation: compile the string specified by @i{c-addr1},
  313:     \G @i{u} into the current definition. Run-time: return
  314:     \G @i{c-addr2 u} describing the address and length of the
  315:     \G string.
  316:     postpone (S") here over char+ allot  place align ;
  317:                                              immediate restrict
  318: 
  319: \ \ abort"							22feb93py
  320: 
  321: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext	abort-quote
  322:     \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
  323:     \G displaying the string @i{ccc} if there is no exception frame on the
  324:     \G exception stack.
  325:     postpone (abort") ," ;        immediate restrict
  326: 
  327: \ \ Header states						23feb93py
  328: 
  329: : cset ( bmask c-addr -- )
  330:     tuck @ or swap ! ; 
  331: 
  332: : creset ( bmask c-addr -- )
  333:     tuck @ swap invert and swap ! ; 
  334: 
  335: : ctoggle ( bmask c-addr -- )
  336:     tuck @ xor swap ! ; 
  337: 
  338: : lastflags ( -- c-addr )
  339:     \ the address of the flags byte in the last header
  340:     \ aborts if the last defined word was headerless
  341:     last @ dup 0= abort" last word was headerless" cell+ ;
  342: 
  343: : immediate ( -- ) \ core
  344:     \G Make the compilation semantics of a word be to @code{execute}
  345:     \G the execution semantics.
  346:     immediate-mask lastflags cset ;
  347: 
  348: : restrict ( -- ) \ gforth
  349:     \G A synonym for @code{compile-only}
  350:     restrict-mask lastflags cset ;
  351: 
  352: ' restrict alias compile-only ( -- ) \ gforth
  353: \G Remove the interpretation semantics of a word.
  354: 
  355: \ \ Create Variable User Constant                        	17mar93py
  356: 
  357: : Alias    ( xt "name" -- ) \ gforth
  358:     Header reveal
  359:     alias-mask lastflags creset
  360:     dup A, lastcfa ! ;
  361: 
  362: doer? :dovar [IF]
  363: 
  364: : Create ( "name" -- ) \ core
  365:     Header reveal dovar: cfa, ;
  366: [ELSE]
  367: 
  368: : Create ( "name" -- ) \ core
  369:     Header reveal here lastcfa ! 0 A, 0 , DOES> ;
  370: [THEN]
  371: 
  372: : Variable ( "name" -- ) \ core
  373:     Create 0 , ;
  374: 
  375: : AVariable ( "name" -- ) \ gforth
  376:     Create 0 A, ;
  377: 
  378: : 2Variable ( "name" -- ) \ double two-variable
  379:     create 0 , 0 , ;
  380: 
  381: : uallot ( n -- ) \ gforth
  382:     udp @ swap udp +! ;
  383: 
  384: doer? :douser [IF]
  385: 
  386: : User ( "name" -- ) \ gforth
  387:     Header reveal douser: cfa, cell uallot , ;
  388: 
  389: : AUser ( "name" -- ) \ gforth
  390:     User ;
  391: [ELSE]
  392: 
  393: : User Create cell uallot , DOES> @ up @ + ;
  394: 
  395: : AUser User ;
  396: [THEN]
  397: 
  398: doer? :docon [IF]
  399:     : (Constant)  Header reveal docon: cfa, ;
  400: [ELSE]
  401:     : (Constant)  Create DOES> @ ;
  402: [THEN]
  403: 
  404: : Constant ( w "name" -- ) \ core
  405:     \G Define a constant @i{name} with value @i{w}.
  406:     \G  
  407:     \G @i{name} execution: @i{-- w}
  408:     (Constant) , ;
  409: 
  410: : AConstant ( addr "name" -- ) \ gforth
  411:     (Constant) A, ;
  412: 
  413: : Value ( w "name" -- ) \ core-ext
  414:     (Constant) , ;
  415: 
  416: : 2Constant ( w1 w2 "name" -- ) \ double two-constant
  417:     Create ( w1 w2 "name" -- )
  418:         2,
  419:     DOES> ( -- w1 w2 )
  420:         2@ ;
  421:     
  422: doer? :dofield [IF]
  423:     : (Field)  Header reveal dofield: cfa, ;
  424: [ELSE]
  425:     : (Field)  Create DOES> @ + ;
  426: [THEN]
  427: \ IS Defer What's Defers TO                            24feb93py
  428: 
  429: doer? :dodefer [IF]
  430: 
  431: : Defer ( "name" -- ) \ gforth
  432:     \ !! shouldn't it be initialized with abort or something similar?
  433:     Header Reveal dodefer: cfa,
  434:     ['] noop A, ;
  435: 
  436: [ELSE]
  437: 
  438: : Defer ( "name" -- ) \ gforth
  439:     Create ['] noop A,
  440: DOES> @ execute ;
  441: 
  442: [THEN]
  443: 
  444: : Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
  445:     \G Compiles the present contents of the deferred word @i{name}
  446:     \G into the current definition.  I.e., this produces static
  447:     \G binding as if @i{name} was not deferred.
  448:     ' >body @ compile, ; immediate
  449: 
  450: :noname
  451:     dodoes, here !does ]
  452:     defstart :-hook ;
  453: :noname
  454:     ;-hook ?struc
  455:     [ has? xconds [IF] ] exit-like [ [THEN] ]
  456:     postpone (does>) dodoes,
  457:     defstart :-hook ;
  458: interpret/compile: DOES>  ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core        does
  459: 
  460: : <IS> ( "name" xt -- ) \ gforth
  461:     \g Changes the @code{defer}red word @var{name} to execute @var{xt}.
  462:     ' >body ! ;
  463: 
  464: : [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
  465:     \g At run-time, changes the @code{defer}red word @var{name} to
  466:     \g execute @var{xt}.
  467:     ' >body postpone ALiteral postpone ! ; immediate restrict
  468: 
  469: ' <IS>
  470: ' [IS]
  471: interpret/compile: IS ( xt "name" -- ) \ gforth
  472: \G A combined word made up from @code{<IS>} and @code{[IS]}.
  473: 
  474: ' <IS>
  475: ' [IS]
  476: interpret/compile: TO ( w "name" -- ) \ core-ext
  477: 
  478: :noname    ' >body @ ;
  479: :noname    ' >body postpone ALiteral postpone @ ;
  480: interpret/compile: What's ( interpretation "name" -- xt; compilation "name" -- ; run-time -- xt ) \ gforth
  481: \G @i{Xt} is the XT that is currently assigned to @i{name}.
  482: 
  483: \ \ interpret/compile:
  484: 
  485: struct
  486:     >body
  487:     cell% field interpret/compile-int
  488:     cell% field interpret/compile-comp
  489: end-struct interpret/compile-struct
  490: 
  491: : interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
  492:     Create immediate swap A, A,
  493: DOES>
  494:     abort" executed primary cfa of an interpret/compile: word" ;
  495: \    state @ IF  cell+  THEN  perform ;
  496: 
  497: : interpret/compile? ( xt -- flag )
  498:     >does-code ['] DOES> >does-code = ;
  499: 
  500: \ \ : ;                                                  	24feb93py
  501: 
  502: defer :-hook ( sys1 -- sys2 )
  503: 
  504: defer ;-hook ( sys2 -- sys1 )
  505: 
  506: 0 Constant defstart
  507: 
  508: [IFDEF] docol,
  509: : (:noname) ( -- colon-sys )
  510:     \ common factor of : and :noname
  511:     docol, ]comp defstart ] :-hook ;
  512: [ELSE]
  513: : (:noname) ( -- colon-sys )
  514:     \ common factor of : and :noname
  515:     docol: cfa, defstart ] :-hook ;
  516: [THEN]
  517: 
  518: : : ( "name" -- colon-sys ) \ core	colon
  519:     Header (:noname) ;
  520: 
  521: : :noname ( -- xt colon-sys ) \ core-ext	colon-no-name
  522:     0 last !
  523:     cfalign here (:noname) ;
  524: 
  525: [IFDEF] fini,
  526: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core   semicolon
  527:     ;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
  528: [ELSE]
  529: : ; ( compilation colon-sys -- ; run-time nest-sys ) \ core	semicolon
  530:     ;-hook ?struc postpone exit reveal postpone [ ; immediate restrict
  531: [THEN]
  532: 
  533: \ \ Search list handling: reveal words, recursive		23feb93py
  534: 
  535: : last?   ( -- false / nfa nfa )
  536:     last @ ?dup ;
  537: 
  538: : (reveal) ( nt wid -- )
  539:     wordlist-id dup >r
  540:     @ over ( name>link ) ! 
  541:     r> ! ;
  542: 
  543: \ make entry in wordlist-map
  544: ' (reveal) f83search reveal-method !
  545: 
  546: Variable warnings ( -- addr ) \ gforth
  547: G -1 warnings T !
  548: 
  549: : check-shadow  ( addr count wid -- )
  550:     \G prints a warning if the string is already present in the wordlist
  551:     >r 2dup 2dup r> (search-wordlist) warnings @ and ?dup if
  552: 	>stderr
  553: 	." redefined " name>string 2dup type
  554: 	compare 0<> if
  555: 	    ."  with " type
  556: 	else
  557: 	    2drop
  558: 	then
  559: 	space space EXIT
  560:     then
  561:     2drop 2drop ;
  562: 
  563: : reveal ( -- ) \ gforth
  564:     last?
  565:     if \ the last word has a header
  566: 	dup ( name>link ) @ 1 and
  567: 	if \ it is still hidden
  568: 	    dup ( name>link ) @ 1 xor		( nt wid )
  569: 	    2dup >r name>string r> check-shadow ( nt wid )
  570: 	    dup wordlist-map @ reveal-method perform
  571: 	else
  572: 	    drop
  573: 	then
  574:     then ;
  575: 
  576: : rehash  ( wid -- )
  577:     dup wordlist-map @ rehash-method perform ;
  578: 
  579: ' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
  580: \g Make the current definition visible, enabling it to call itself
  581: \g recursively.
  582: 	immediate restrict

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