\ oof.fs Object Oriented FORTH \ This file is (c) 1996 by Bernd Paysan \ e-mail: paysan@informatik.tu-muenchen.de \ \ Please copy and share this program, modify it for your system \ and improve it as you like. But don't remove this notice. \ \ Thank you. \ \ The program uses the following words \ from CORE : \ decimal : bl word 0= ; = cells Constant Variable ! Create , allot @ IF \ POSTPONE >r ELSE +! dup + THEN immediate r> * >body cell+ Literal drop \ align here aligned DOES> execute ['] 2@ recurse swap 1+ over LOOP and \ EXIT ?dup 0< rot r@ - i negate +LOOP 2drop BEGIN WHILE 2dup REPEAT 1- \ rshift > / ' move UNTIL or count \ from CORE-EXT : \ nip tuck true ?DO compile, false Value erase pick :noname 0<> \ from BLOCK-EXT : \ \ \ from EXCEPTION : \ throw \ from EXCEPTION-EXT : \ abort" \ from FILE : \ ( S" \ from FLOAT : \ faligned \ from LOCAL : \ TO \ from MEMORY : \ allocate free \ from SEARCH : \ find definitions get-order set-order get-current wordlist set-current \ search-wordlist \ from SEARCH-EXT : \ also Forth previous \ from STRING : \ /string compare \ from TOOLS-EXT : \ [IF] [THEN] [ELSE] state \ Loadscreen 27dec95py decimal : define? ( -- flag ) bl word find nip 0= ; define? cell [IF] 1 cells Constant cell [THEN] define? ?EXIT [IF] : ?EXIT postpone IF postpone EXIT postpone THEN ; immediate [THEN] define? Vocabulary [IF] : Vocabulary wordlist create , DOES> @ >r get-order nip r> swap set-order ; [THEN] define? faligned [IF] false [ELSE] 1 faligned 8 = [THEN] [IF] : 8aligned ( n1 -- n2 ) faligned ; [ELSE] : 8aligned ( n1 -- n2 ) 7 + -8 and ; [THEN] Vocabulary Objects also Objects also definitions Vocabulary types types also 0 cells Constant :wordlist 1 cells Constant :parent 2 cells Constant :child 3 cells Constant :next 4 cells Constant :method# 5 cells Constant :var# 6 cells Constant :newlink 7 cells Constant :iface 8 cells Constant :init 0 cells Constant :inext 1 cells Constant :ilist 2 cells Constant :ilen 3 cells Constant :inum Variable op : op! ( o -- ) op ! ; Forth definitions Create ostack 0 , 16 cells allot : ^ ( -- o ) op @ ; : o@ ( -- o ) op @ @ ; : >o ( o -- ) state @ IF postpone ^ postpone >r postpone op! ELSE 1 ostack +! ^ ostack dup @ cells + ! op! THEN ; immediate : o> ( -- ) state @ IF postpone r> postpone op! ELSE ostack dup @ cells + @ op! -1 ostack +! THEN ; immediate : o[] ( n -- ) o@ :var# + @ * ^ + op! ; Objects definitions \ Coding 27dec95py 0 Constant #static 1 Constant #method 2 Constant #early 3 Constant #var 4 Constant #defer : exec? ( addr -- flag ) >body cell+ @ #method = ; : static? ( addr -- flag ) >body cell+ @ #static = ; : early? ( addr -- flag ) >body cell+ @ #early = ; : defer? ( addr -- flag ) >body cell+ @ #defer = ; false Value oset? : o+, ( addr offset -- ) postpone Literal postpone ^ postpone + oset? IF postpone op! ELSE postpone >o THEN drop ; : o*, ( addr offset -- ) postpone Literal postpone * postpone Literal postpone + oset? IF postpone op! ELSE postpone >o THEN ; : ^+@ ( offset -- addr ) ^ + @ ; : o+@, ( addr offset -- ) postpone Literal postpone ^+@ oset? IF postpone op! ELSE postpone >o THEN drop ; : ^*@ ( offset -- addr ) ^ + @ tuck @ :var# + @ 8aligned * + ; : o+@*, ( addr offset -- ) postpone Literal postpone ^*@ oset? IF postpone op! ELSE postpone >o THEN drop ; \ variables / memory allocation 30oct94py Variable lastob Variable lastparent 0 lastparent ! Variable vars Variable methods Variable decl 0 decl ! Variable 'link : crash true abort" unbound method" ; : link, ( addr -- ) align here 'link ! , 0 , 0 , ; 0 link, \ type declaration 30oct94py : vallot ( size -- offset ) vars @ >r dup vars +! 'link @ 0= IF lastparent @ dup IF :newlink + @ THEN link, THEN 'link @ 2 cells + +! r> ; : valign ( -- ) vars @ aligned vars ! ; define? faligned 0= [IF] : vfalign ( -- ) vars @ faligned vars ! ; [THEN] : mallot ( -- offset ) methods @ cell methods +! ; types definitions : static ( -- ) \ oof- oof \G Create a class-wide cell sized variable mallot Create , #static , DOES> @ o@ + ; : method ( -- ) \ oof- oof \G Create a method selector mallot Create , #method , DOES> @ o@ + @ execute ; : early ( -- ) \ oof- oof \G Create a method selector for early binding Create ['] crash , #early , DOES> @ execute ; : var ( size -- ) \ oof- oof \G Create an instance variable vallot Create , #var , DOES> @ ^ + ; : defer ( -- ) \ oof- oof \G Create an instance defer valign cell vallot Create , #defer , DOES> @ ^ + @ execute ; \ dealing with threads 29oct94py Objects definitions : object-order ( wid0 .. widm m addr -- wid0 .. widn n ) dup IF 2@ >r recurse r> swap 1+ ELSE drop THEN ; : interface-order ( wid0 .. widm m addr -- wid0 .. widn n ) dup IF 2@ >r recurse r> :ilist + @ swap 1+ ELSE drop THEN ; : add-order ( addr -- n ) dup 0= ?EXIT >r get-order r> swap >r 0 swap dup >r object-order r> :iface + @ interface-order r> over >r + set-order r> ; : drop-order ( n -- ) 0 ?DO previous LOOP ; \ object compiling/executing 20feb95py : o, ( xt early? -- ) over exec? over and IF drop >body @ o@ + @ compile, EXIT THEN over static? over and IF drop >body @ o@ + @ postpone Literal EXIT THEN drop dup early? IF >body @ THEN compile, ; : findo ( string -- cfa n ) o@ add-order >r find ?dup 0= IF drop set-order true abort" method not found!" THEN r> drop-order ; false Value method? : method, ( object early? -- ) true to method? swap >o >r bl word findo 0< state @ and IF r> o, ELSE r> drop execute THEN o> false to method? ; : cmethod, ( object early? -- ) state @ >r state on method, r> state ! ; : early, ( object -- ) true to oset? true method, state @ oset? and IF postpone o> THEN false to oset? ; : late, ( object -- ) true to oset? false method, state @ oset? and IF postpone o> THEN false to oset? ; \ new, 29oct94py previous Objects definitions Variable alloc 0 Value ohere : oallot ( n -- ) ohere + to ohere ; : ((new, ( link -- ) dup @ ?dup IF recurse THEN cell+ 2@ swap ohere + >r ?dup IF ohere >r dup >r :newlink + @ recurse r> r> ! THEN r> to ohere ; : (new ( object -- ) ohere >r dup >r :newlink + @ ((new, r> r> ! ; : init-instance ( pos link -- pos ) dup >r @ ?dup IF recurse THEN r> cell+ 2@ IF drop dup >r ^ + >o o@ :init + @ execute 0 o@ :newlink + @ recurse o> r> THEN + ; : init-object ( object -- size ) >o o@ :init + @ execute 0 o@ :newlink + @ init-instance o> ; : (new, ( object -- ) ohere dup >r over :var# + @ erase (new r> init-object drop ; : size@ ( objc -- size ) :var# + @ 8aligned ; : (new[], ( n o -- addr ) ohere >r dup size@ rot over * oallot r@ ohere dup >r 2 pick - ?DO I to ohere >r dup >r (new, r> r> dup negate +LOOP 2drop r> to ohere r> ; \ new, 29oct94py Create chunks here 16 cells dup allot erase : DelFix ( addr root -- ) dup @ 2 pick ! ! ; : NewFix ( root size # -- addr ) BEGIN 2 pick @ ?dup 0= WHILE 2dup * allocate throw over 0 ?DO dup 4 pick DelFix 2 pick + LOOP drop REPEAT >r drop r@ @ rot ! r@ swap erase r> ; : >chunk ( n -- root n' ) 1- -8 and dup 3 rshift cells chunks + swap 8 + ; : Dalloc ( size -- addr ) dup 128 > IF allocate throw EXIT THEN >chunk 2048 over / NewFix ; : Salloc ( size -- addr ) align here swap allot ; : dispose, ( addr size -- ) dup 128 > IF drop free throw EXIT THEN >chunk drop DelFix ; : new, ( o -- addr ) dup :var# + @ alloc @ execute dup >r to ohere (new, r> ; : new[], ( n o -- addr ) dup :var# + @ 8aligned 2 pick * alloc @ execute to ohere (new[], ; Forth definitions : dynamic ['] Dalloc alloc ! ; dynamic : static ['] Salloc alloc ! ; Objects definitions \ instance creation 29mar94py : instance, ( o -- ) alloc @ >r static new, r> alloc ! drop DOES> state @ IF dup postpone Literal oset? IF postpone op! ELSE postpone >o THEN THEN early, ; : ptr, ( o -- ) 0 , , DOES> state @ IF dup postpone Literal postpone @ oset? IF postpone op! ELSE postpone >o THEN cell+ ELSE @ THEN late, ; : array, ( n o -- ) alloc @ >r static new[], r> alloc ! drop DOES> ( n -- ) dup dup @ size@ state @ IF o*, ELSE nip rot * + THEN early, ; \ class creation 29mar94py Variable voc# Variable classlist Variable old-current Variable ob-interface : voc! ( addr -- ) get-current old-current ! add-order 2 + voc# ! get-order wordlist tuck classlist ! 1+ set-order also types classlist @ set-current ; : (class ( parent -- ) here lastob ! true decl ! 0 ob-interface ! 0 , dup voc! dup lastparent ! dup 0= IF 0 ELSE :method# + 2@ THEN methods ! vars ! DOES> false method, ; : (is ( addr -- ) bl word findo drop dup defer? abort" not deferred!" >body @ state @ IF postpone ^ postpone Literal postpone + postpone ! ELSE ^ + ! THEN ; : inherit ( -- ) bl word findo drop dup exec? IF >body @ dup o@ + @ swap lastob @ + ! EXIT THEN abort" Not a polymorph method!" ; \ instance variables inside objects 27dec93py : instvar, ( addr -- ) dup , here 0 , 0 vallot swap ! 'link @ 2 cells + @ IF 'link @ link, THEN 'link @ >r dup r@ cell+ ! :var# + @ dup vars +! r> 2 cells + ! DOES> dup 2@ swap state @ IF o+, ELSE ^ + nip nip THEN early, ; : instptr> ( -- ) DOES> dup 2@ swap state @ IF o+@, ELSE ^ + @ nip nip THEN late, ; : instptr, ( addr -- ) , here 0 , cell vallot swap ! instptr> ; : (o* ( i addr -- addr' ) dup @ :var# + @ 8aligned rot * + ; : instarray, ( addr -- ) , here 0 , cell vallot swap ! DOES> dup 2@ swap state @ IF o+@*, ELSE ^ + @ nip nip (o* THEN late, ; \ bind instance pointers 27mar94py : ((link ( addr -- o addr' ) 2@ swap ^ + ; : (link ( -- o addr ) bl word findo drop >body state @ IF postpone Literal postpone ((link EXIT THEN ((link ; : parent? ( class o -- class class' ) @ BEGIN 2dup = ?EXIT dup WHILE :parent + @ REPEAT ; : (bound ( obj1 obj2 adr2 -- ) >r over parent? nip 0= abort" not the same class !" r> ! ; : (bind ( addr -- ) \ (link state @ IF postpone (bound EXIT THEN (bound ; : (sbound ( o addr -- ) dup cell+ @ swap (bound ; Forth definitions : bind ( o -- ) ' state @ IF postpone Literal postpone >body postpone (sbound EXIT THEN >body (sbound ; immediate Objects definitions \ method implementation 29oct94py Variable m-name Variable last-interface 0 last-interface ! : interface, ( -- ) last-interface @ BEGIN dup WHILE dup , @ REPEAT drop ; : inter, ( iface -- ) align here over :inum + @ lastob @ + ! here over :ilen + @ dup allot move ; : interfaces, ( -- ) ob-interface @ lastob @ :iface + ! ob-interface @ BEGIN dup WHILE 2@ inter, REPEAT drop ; : lastob! ( -- ) lastob @ dup BEGIN nip dup @ here cell+ 2 pick ! dup 0= UNTIL drop dup , op! o@ lastob ! ; : thread, ( -- ) classlist @ , ; : var, ( -- ) methods @ , vars @ , ; : parent, ( -- o parent ) o@ lastparent @ 2dup dup , 0 , dup IF :child + dup @ , ! ELSE , drop THEN ; : 'link, ( -- ) 'link @ ?dup 0= IF lastparent @ dup IF :newlink + @ THEN THEN , ; : cells, ( -- ) methods @ :init ?DO ['] crash , cell +LOOP ; \ method implementation 20feb95py types definitions : how: ( -- ) \ oof- oof how-to \G End declaration, start implementation decl @ 0= abort" not twice!" 0 decl ! align interface, lastob! thread, parent, var, 'link, 0 , cells, interfaces, dup IF dup :method# + @ >r :init + swap r> :init /string move ELSE 2drop THEN ; : class; ( -- ) \ oof- oof end-class \G End class declaration or implementation decl @ IF how: THEN 0 'link ! voc# @ drop-order old-current @ set-current ; : ptr ( -- ) \ oof- oof \G Create an instance pointer Create immediate lastob @ here lastob ! instptr, ; : asptr ( class -- ) \ oof- oof \G Create an alias to an instance pointer, casted to another class cell+ @ Create immediate lastob @ here lastob ! , , instptr> ; : Fpostpone postpone postpone ; immediate : : ( -- ) \ oof- oof colon decl @ abort" HOW: missing! " bl word findo 0= abort" not found" dup exec? over early? or over >body cell+ @ 0< or 0= abort" not a method" m-name ! :noname ; Forth : ; ( xt colon-sys -- ) \ oof- oof postpone ; m-name @ dup >body swap exec? IF @ o@ + ELSE dup cell+ @ 0< IF 2@ swap o@ + @ + THEN THEN ! ; immediate Forth definitions \ object 23mar95py Create object immediate 0 (class \ do not create as subclass cell var oblink \ create offset for backlink static thread \ method/variable wordlist static parento \ pointer to parent static childo \ ptr to first child static nexto \ ptr to next child of parent static method# \ number of methods (bytes) static size \ number of variables (bytes) static newlink \ ptr to allocated space static ilist \ interface list method init ( ... -- ) \ object- oof method dispose ( -- ) \ object- oof early class ( "name" -- ) \ object- oof early new ( -- o ) \ object- oof immediate early new[] ( n -- o ) \ object- oof new-array immediate early : ( "name" -- ) \ object- oof define early ptr ( "name" -- ) \ object- oof early asptr ( o "name" -- ) \ object- oof early [] ( n "name" -- ) \ object- oof array early :: ( "name" -- ) \ object- oof scope immediate early class? ( o -- flag ) \ object- oof class-query early super ( "name" -- ) \ object- oof immediate early self ( -- o ) \ object- oof early bind ( o "name" -- ) \ object- oof immediate early bound ( class addr "name" -- ) \ object- oof early link ( "name" -- class addr ) \ object- oof immediate early is ( xt "name" -- ) \ object- oof immediate early send ( xt -- ) \ object- oof immediate early with ( o -- ) \ object- oof immediate early endwith ( -- ) \ object- oof immediate early ' ( "name" -- xt ) \ object- oof tick immediate early postpone ( "name" -- ) \ object- oof immediate early definitions ( -- ) \ object- oof \ base object class implementation part 23mar95py how: 0 parento ! 0 childo ! 0 nexto ! : class ( -- ) Create immediate o@ (class ; : : ( -- ) Create immediate o@ decl @ IF instvar, ELSE instance, THEN ; : ptr ( -- ) Create immediate o@ decl @ IF instptr, ELSE ptr, THEN ; : asptr ( addr -- ) decl @ 0= abort" only in declaration!" Create immediate o@ , cell+ @ , instptr> ; : [] ( n -- ) Create immediate o@ decl @ IF instarray, ELSE array, THEN ; : new ( -- o ) o@ state @ IF Fpostpone Literal Fpostpone new, ELSE new, THEN ; : new[] ( n -- o ) o@ state @ IF Fpostpone Literal Fpostpone new[], ELSE new[], THEN ; : dispose ( -- ) ^ size @ dispose, ; : bind ( addr -- ) (bind ; : bound ( o1 o2 addr2 -- ) (bound ; : link ( -- o addr ) (link ; : class? ( class -- flag ) ^ parent? nip 0<> ; : :: ( -- ) state @ IF ^ true method, ELSE inherit THEN ; : super ( -- ) parento true method, ; : is ( cfa -- ) (is ; : self ( -- obj ) ^ ; : init ( -- ) ; : ' ( -- xt ) bl word findo 0= abort" not found!" state @ IF Fpostpone Literal THEN ; : send ( xt -- ) execute ; : postpone ( -- ) o@ add-order Fpostpone Fpostpone drop-order ; : with ( -- ) state @ oset? 0= and IF Fpostpone >o THEN o@ add-order voc# ! false to oset? ; : endwith Fpostpone o> voc# @ drop-order ; : definitions o@ add-order 1+ voc# ! also types o@ lastob ! false to oset? get-current old-current ! thread @ set-current ; class; \ object \ interface 01sep96py Objects definitions : implement ( interface -- ) \ oof-interface- oof align here over , ob-interface @ , ob-interface ! :ilist + @ >r get-order r> swap 1+ set-order 1 voc# +! ; : inter-method, ( interface -- ) \ oof-interface- oof :ilist + @ bl word count 2dup s" '" compare 0= dup >r IF 2drop bl word count THEN rot search-wordlist dup 0= abort" Not an interface method!" r> IF drop state @ IF postpone Literal THEN EXIT THEN 0< state @ and IF compile, ELSE execute THEN ; Variable inter-list Variable lastif Variable inter# Vocabulary interfaces interfaces definitions : method ( -- ) \ oof-interface- oof mallot Create , inter# @ , DOES> 2@ swap o@ + @ + @ execute ; : how: ( -- ) \ oof-interface- oof align here lastif @ ! 0 decl ! here last-interface @ , last-interface ! inter-list @ , methods @ , inter# @ , methods @ :inum cell+ ?DO ['] crash , LOOP ; : interface; ( -- ) \ oof-interface- oof old-current @ set-current previous previous ; : : ( -- ) \ oof-interface- oof colon decl @ abort" HOW: missing! " bl word count lastif @ @ :ilist + @ search-wordlist 0= abort" not found" dup >body cell+ @ 0< 0= abort" not a method" m-name ! :noname ; Forth : ; ( xt colon-sys -- ) \ oof-interface- oof postpone ; m-name @ >body @ lastif @ @ + ! ; immediate Forth definitions : interface ( -- ) \ oof-interface- oof Create here lastif ! 0 , get-current old-current ! last-interface @ dup IF :inum @ THEN 1 cells - inter# ! get-order wordlist dup inter-list ! dup set-current swap 1+ set-order true decl ! 0 vars ! :inum cell+ methods ! also interfaces DOES> @ decl @ IF implement ELSE inter-method, THEN ; previous previous
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