[gforth] / gforth / objects.fs  

gforth: gforth/objects.fs

Diff for /gforth/objects.fs between version 1.11 and 1.12

version 1.11, Tue Dec 8 22:02:48 1998 UTC version 1.12, Tue Feb 16 06:32:29 1999 UTC
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     cell%    field class-parent      cell%    field class-parent
     cell%    field class-wordlist \ inst-vars and other protected words      cell%    field class-wordlist \ inst-vars and other protected words
     cell% 2* field class-inst-size ( class -- addr ) \ objects- objects      cell% 2* field class-inst-size ( class -- addr ) \ objects- objects
     \g used as @code{class-inst-size 2@ ( class -- align size )},      \g Give the size specification for an instance (i.e. an object)
     \g gives the size specification for an instance (i.e. an object)      \g of @var{class};
     \g of @code{class}.      \g used as @code{class-inst-size 2@ ( class -- align size )}.
 end-struct class%  end-struct class%
   
 struct  struct
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 \ selectors and methods  \ selectors and methods
   
 variable current-interface ( -- addr ) \ objects- objects  variable current-interface ( -- addr ) \ objects- objects
 \g this variable contains the class or interface currently being  \g Variable: contains the class or interface currently being
 \g defined.  \g defined.
   
   
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 : method ( xt "name" -- ) \ objects- objects  : method ( xt "name" -- ) \ objects- objects
     \g @code{name} execution: @code{... object -- ...}@*      \g @code{name} execution: @code{... object -- ...}@*
     \g creates selector @code{name} and makes @code{xt} its method in      \g Create selector @var{name} and makes @var{xt} its method in
     \g the current class.      \g the current class.
     create      create
     current-interface @ interface-map 2@ ( xt map-addr map-size )      current-interface @ interface-map 2@ ( xt map-addr map-size )
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     then ;      then ;
   
 : selector ( "name" -- ) \ objects- objects  : selector ( "name" -- ) \ objects- objects
     \g @code{name} execution: @code{... object -- ...}@*      \g @var{name} execution: @code{... object -- ...}@*
     \g creates selector @code{name} for the current class and its      \g Create selector @var{name} for the current class and its
     \g descendents; you can set a method for the selector in the      \g descendents; you can set a method for the selector in the
     \g current class with @code{overrides}.      \g current class with @code{overrides}.
     ['] no-method method ;      ['] no-method method ;
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     selector-offset @ + ! ;      selector-offset @ + ! ;
   
 : class->map ( class -- map ) \ objects- objects  : class->map ( class -- map ) \ objects- objects
     \g @code{map} is the pointer to @code{class}'s method map; it      \g @var{map} is the pointer to @var{class}'s method map; it
     \g points to the place in the map to which the selector offsets      \g points to the place in the map to which the selector offsets
     \g refer (i.e., where @code{object-map}s point to).      \g refer (i.e., where @var{object-map}s point to).
     dup interface-map 2@ drop swap interface-map-offset @ + ;      dup interface-map 2@ drop swap interface-map-offset @ + ;
   
 : unique-interface-map ( class-map offset -- )  : unique-interface-map ( class-map offset -- )
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     then ;      then ;
   
 : class-override! ( xt sel-xt class-map -- ) \ objects- objects  : class-override! ( xt sel-xt class-map -- ) \ objects- objects
     \g @code{xt} is the new method for the selector @code{sel-xt} in      \g @var{xt} is the new method for the selector @var{sel-xt} in
     \g @code{class-map}.      \g @var{class-map}.
     over >body ( xt sel-xt class-map selector-body )      over >body ( xt sel-xt class-map selector-body )
     selector-interface @ ( xt sel-xt class-map offset )      selector-interface @ ( xt sel-xt class-map offset )
     ?dup-if \ the selector is for an interface      ?dup-if \ the selector is for an interface
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     interface-override! ;      interface-override! ;
   
 : overrides ( xt "selector" -- ) \ objects- objects  : overrides ( xt "selector" -- ) \ objects- objects
     \g replace default method for @code{selector} in the current class      \g replace default method for @var{selector} in the current class
     \g with @code{xt}. @code{overrides} must not be used during an      \g with @var{xt}. @code{overrides} must not be used during an
     \g interface definition.      \g interface definition.
     ' current-interface @ class->map class-override! ;      ' current-interface @ class->map class-override! ;
   
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 variable last-interface-offset 0 last-interface-offset !  variable last-interface-offset 0 last-interface-offset !
   
 : interface ( -- ) \ objects- objects  : interface ( -- ) \ objects- objects
     \g starts an interface definition.      \g Start an interface definition.
     interface% %allot >r      interface% %allot >r
     r@ current-interface !      r@ current-interface !
     current-interface 1 cells save-mem r@ interface-map 2!      current-interface 1 cells save-mem r@ interface-map 2!
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     0 r> interface-map-offset ! ;      0 r> interface-map-offset ! ;
   
 : end-interface-noname ( -- interface ) \ objects- objects  : end-interface-noname ( -- interface ) \ objects- objects
     \g ends an interface definition. The resulting interface is      \g End an interface definition. The resulting interface is
     \g @code{interface}.      \g @var{interface}.
     current-interface @ ;      current-interface @ ;
   
 : end-interface ( "name" -- ) \ objects- objects  : end-interface ( "name" -- ) \ objects- objects
     \g @code{name} execution: @code{-- interface}@*      \g @code{name} execution: @code{-- interface}@*
     \g ends an interface definition. The resulting interface is      \g End an interface definition. The resulting interface is
     \g @code{interface}.      \g @var{interface}.
     end-interface-noname constant ;      end-interface-noname constant ;
   
 \ classes  \ classes
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     r> class-wordlist @ swap 1+ ;      r> class-wordlist @ swap 1+ ;
   
 : push-order ( class -- ) \ objects- objects  : push-order ( class -- ) \ objects- objects
     \g add @code{class}'s wordlists to the search-order (in front)      \g Add @var{class}'s wordlists to the head of the search-order.
     >r get-order r> add-class-order set-order ;      >r get-order r> add-class-order set-order ;
   
 : class ( parent-class -- align offset ) \ objects- objects  : class ( parent-class -- align offset ) \ objects- objects
     \g start a new class definition as a child of      \g Start a new class definition as a child of
     \g @code{parent-class}. @code{align offset} are for use by      \g @var{parent-class}. @var{align offset} are for use by
     \g @code{field} etc.      \g @var{field} etc.
     class% %allot >r      class% %allot >r
     dup interface-map 2@ save-mem r@ interface-map 2!      dup interface-map 2@ save-mem r@ interface-map 2!
     dup interface-map-offset @ r@ interface-map-offset !      dup interface-map-offset @ r@ interface-map-offset !
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     drop ;      drop ;
   
 : drop-order ( class -- ) \ objects- objects  : drop-order ( class -- ) \ objects- objects
     \g drops @code{class}'s wordlists from the search order. No      \g Drop @var{class}'s wordlists from the search order. No
     \g checking is made whether @code{class}'s wordlists are actually      \g checking is made whether @var{class}'s wordlists are actually
     \g on the search order.      \g on the search order.
     >r get-order r> remove-class-order set-order ;      >r get-order r> remove-class-order set-order ;
   
 : end-class-noname ( align offset -- class ) \ objects- objects  : end-class-noname ( align offset -- class ) \ objects- objects
     \g ends a class definition. The resulting class is @code{class}.      \g End a class definition. The resulting class is @var{class}.
     current-interface @ dup drop-order class-inst-size 2!      current-interface @ dup drop-order class-inst-size 2!
     end-interface-noname ;      end-interface-noname ;
   
 : end-class ( align offset "name" -- ) \ objects- objects  : end-class ( align offset "name" -- ) \ objects- objects
     \g @code{name} execution: @code{-- class}@*      \g @var{name} execution: @code{-- class}@*
     \g ends a class definition. The resulting class is @code{class}.      \g End a class definition. The resulting class is @var{class}.
     \ name execution: ( -- class )      \ name execution: ( -- class )
     end-class-noname constant ;      end-class-noname constant ;
   
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 variable public-wordlist  variable public-wordlist
   
 : protected ( -- ) \ objects- objects  : protected ( -- ) \ objects- objects
     \g set the compilation wordlist to the current class's wordlist      \g Set the compilation wordlist to the current class's wordlist
     current-interface @ class-wordlist @      current-interface @ class-wordlist @
     dup get-current <>      dup get-current <>
     if \ we are not protected already      if \ we are not protected already
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     set-current ;      set-current ;
   
 : public ( -- ) \ objects- objects  : public ( -- ) \ objects- objects
     \g restore the compilation wordlist that was in effect before the      \g Restore the compilation wordlist that was in effect before the
     \g last @code{protected} that actually changed the compilation      \g last @code{protected} that actually changed the compilation
     \g wordlist.      \g wordlist.
     public-wordlist @ set-current ;      public-wordlist @ set-current ;
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 \ classes that implement interfaces  \ classes that implement interfaces
   
 : front-extend-mem ( addr1 u1 u -- addr addr2 u2 )  : front-extend-mem ( addr1 u1 u -- addr addr2 u2 )
     \ extend memory block allocated from the heap by u aus, with the      \ Extend memory block allocated from the heap by u aus, with the
     \ old stuff coming at the end      \ old stuff coming at the end
     2dup + dup >r allocate throw ( addr1 u1 u addr2 ; R: u2 )      2dup + dup >r allocate throw ( addr1 u1 u addr2 ; R: u2 )
     dup >r + >r over r> rot move ( addr1 ; R: u2 addr2 )      dup >r + >r over r> rot move ( addr1 ; R: u2 addr2 )
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     r> dup r> ;      r> dup r> ;
   
 : implementation ( interface -- ) \ objects- objects  : implementation ( interface -- ) \ objects- objects
     \g the current class implements @code{interface}. I.e., you can      \g The current class implements @var{interface}. I.e., you can
     \g use all selectors of the interface in the current class and its      \g use all selectors of the interface in the current class and its
     \g descendents.      \g descendents.
     dup interface-offset @ ( interface offset )      dup interface-offset @ ( interface offset )
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 0 value this ( -- object ) \ objects- objects  0 value this ( -- object ) \ objects- objects
 \g the receiving object of the current method (aka active object).  \g the receiving object of the current method (aka active object).
 : to-this ( object -- ) \ objects- objects  : to-this ( object -- ) \ objects- objects
     \g sets @code{this} (used internally, but useful when debugging).      \g Set @code{this} (used internally, but useful when debugging).
     TO this ;      TO this ;
   
 \ another implementation, if you don't have (fast) values  \ another implementation, if you don't have (fast) values
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 \     thisp ! ;  \     thisp ! ;
   
 : m: ( -- xt colon-sys; run-time: object -- ) \ objects- objects  : m: ( -- xt colon-sys; run-time: object -- ) \ objects- objects
     \g start a method definition; @code{object} becomes new @code{this}.      \g Start a method definition; @var{object} becomes new @code{this}.
     :noname      :noname
     POSTPONE this      POSTPONE this
     POSTPONE >r      POSTPONE >r
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     POSTPONE exit ; immediate      POSTPONE exit ; immediate
   
 : ;m ( colon-sys --; run-time: -- ) \ objects- objects  : ;m ( colon-sys --; run-time: -- ) \ objects- objects
     \g end a method definition; restore old @code{this}.      \g End a method definition; restore old @code{this}.
     POSTPONE r>      POSTPONE r>
     POSTPONE to-this      POSTPONE to-this
     POSTPONE ; ; immediate      POSTPONE ; ; immediate
   
 : catch ( ... xt -- ... n ) \ exception  : catch ( ... xt -- ... n ) \ exception
     \ make it safe to call CATCH within a method.      \ Make it safe to call CATCH within a method.
     \ should also be done with all words containing CATCH.      \ should also be done with all words containing CATCH.
     this >r catch r> to-this ;      this >r catch r> to-this ;
   
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     ( addr1 ) @ this + ;      ( addr1 ) @ this + ;
   
 : inst-var ( align1 offset1 align size "name" -- align2 offset2 ) \ objects- objects  : inst-var ( align1 offset1 align size "name" -- align2 offset2 ) \ objects- objects
     \g @code{name} execution: @code{-- addr}@*      \g @var{name} execution: @code{-- addr}@*
     \g @code{addr} is the address of the field @code{name} in      \g @var{addr} is the address of the field @var{name} in
     \g @code{this} object.      \g @code{this} object.
     ['] do-inst-var inst-something ;      ['] do-inst-var inst-something ;
   
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     ( addr1 ) @ this + @ ;      ( addr1 ) @ this + @ ;
   
 : inst-value ( align1 offset1 "name" -- align2 offset2 ) \ objects- objects  : inst-value ( align1 offset1 "name" -- align2 offset2 ) \ objects- objects
     \g @code{name} execution: @code{-- w}@*      \g @var{name} execution: @code{-- w}@*
     \g @code{w} is the value of the field @code{name} in @code{this}      \g @var{w} is the value of the field @var{name} in @code{this}
     \g object.      \g object.
     cell% ['] do-inst-value inst-something ;      cell% ['] do-inst-value inst-something ;
   
 : <to-inst> ( w xt -- ) \ objects- objects  : <to-inst> ( w xt -- ) \ objects- objects
     \g store @code{w} into the field @code{xt} in @code{this} object.      \g store @var{w} into the field @var{xt} in @code{this} object.
     >body @ this + ! ;      >body @ this + ! ;
   
 : [to-inst] ( compile-time: "name" -- ; run-time: w -- ) \ objects- objects  : [to-inst] ( compile-time: "name" -- ; run-time: w -- ) \ objects- objects
     \g store @code{w} into field @code{name} in @code{this} object.      \g store @var{w} into field @var{name} in @code{this} object.
     ' >body @ POSTPONE literal      ' >body @ POSTPONE literal
     POSTPONE this      POSTPONE this
     POSTPONE +      POSTPONE +
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 \ class binding stuff  \ class binding stuff
   
 : <bind> ( class selector-xt -- xt ) \ objects- objects  : <bind> ( class selector-xt -- xt ) \ objects- objects
     \g @code{xt} is the method for the selector @code{selector-xt} in      \g @var{xt} is the method for the selector @var{selector-xt} in
     \g @code{class}.      \g @var{class}.
     >body swap class->map over selector-interface @      >body swap class->map over selector-interface @
     ?dup-if      ?dup-if
         + @          + @
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     swap selector-offset @ + @ ;      swap selector-offset @ + @ ;
   
 : bind' ( "class" "selector" -- xt ) \ objects- objects  : bind' ( "class" "selector" -- xt ) \ objects- objects
     \g @code{xt} is the method for @code{selector} in @code{class}.      \g @var{xt} is the method for @var{selector} in @var{class}.
     ' execute ' <bind> ;      ' execute ' <bind> ;
   
 : bind ( ... "class" "selector" -- ... ) \ objects- objects  : bind ( ... "class" "selector" -- ... ) \ objects- objects
     \g execute the method for @code{selector} in @code{class}.      \g Execute the method for @var{selector} in @var{class}.
     bind' execute ;      bind' execute ;
   
 : [bind] ( compile-time: "class" "selector" -- ; run-time: ... object -- ... ) \ objects- objects  : [bind] ( compile-time: "class" "selector" -- ; run-time: ... object -- ... ) \ objects- objects
     \g compile the method for @code{selector} in @code{class}.      \g Compile the method for @var{selector} in @var{class}.
     bind' compile, ; immediate      bind' compile, ; immediate
   
 : current' ( "selector" -- xt ) \ objects- objects  : current' ( "selector" -- xt ) \ objects- objects
     \g @code{xt} is the method for @code{selector} in the current class.      \g @var{xt} is the method for @var{selector} in the current class.
     current-interface @ ' <bind> ;      current-interface @ ' <bind> ;
   
 : [current] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects  : [current] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects
     \g compile the method for @code{selector} in the current class.      \g Compile the method for @var{selector} in the current class.
     current' compile, ; immediate      current' compile, ; immediate
   
 : [parent] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects  : [parent] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects
     \g compile the method for @code{selector} in the parent of the      \g Compile the method for @var{selector} in the parent of the
     \g current class.      \g current class.
     current-interface @ class-parent @ ' <bind> compile, ; immediate      current-interface @ class-parent @ ' <bind> compile, ; immediate
   
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 ' drop ( object -- )  ' drop ( object -- )
 method construct ( ... object -- ) \ objects- objects  method construct ( ... object -- ) \ objects- objects
 \g initializes the data fields of @code{object}. The method for the  \g Initialize the data fields of @var{object}. The method for the
 \g class @code{object} just does nothing @code{( object -- )}.  \g class @var{object} just does nothing: @code{( object -- )}.
   
 :noname ( object -- )  :noname ( object -- )
     ." object:" dup . ." class:" object-map @ @ . ;      ." object:" dup . ." class:" object-map @ @ . ;
 method print ( object -- ) \ objects- objects  method print ( object -- ) \ objects- objects
 \g prints the object. The method for the class @code{object} prints  \g Print the object. The method for the class @var{object} prints
 \g the address of the object and the address of its class.  \g the address of the object and the address of its class.
   
 end-class object ( -- class ) \ objects- objects  end-class object ( -- class ) \ objects- objects
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 \ constructing objects  \ constructing objects
   
 : init-object ( ... class object -- ) \ objects- objects  : init-object ( ... class object -- ) \ objects- objects
     \g initializes a chunk of memory (@code{object}) to an object of      \g Initialize a chunk of memory (@var{object}) to an object of
     \g class @code{class}; then performs @code{construct}.      \g class @var{class}; then performs @code{construct}.
     swap class->map over object-map ! ( ... object )      swap class->map over object-map ! ( ... object )
     construct ;      construct ;
   
 : xt-new ( ... class xt -- object ) \ objects- objects  : xt-new ( ... class xt -- object ) \ objects- objects
     \g makes a new object, using @code{xt ( align size -- addr )} to      \g Make a new object, using @code{xt ( align size -- addr )} to
     \g get memory.      \g get memory.
     over class-inst-size 2@ rot execute      over class-inst-size 2@ rot execute
     dup >r init-object r> ;      dup >r init-object r> ;
   
 : dict-new ( ... class -- object ) \ objects- objects  : dict-new ( ... class -- object ) \ objects- objects
     \g @code{allot} and initialize an object of class @code{class} in      \g @code{allot} and initialize an object of class @var{class} in
     \g the dictionary.      \g the dictionary.
     ['] %allot xt-new ;      ['] %allot xt-new ;
   
 : heap-new ( ... class -- object ) \ objects- objects  : heap-new ( ... class -- object ) \ objects- objects
     \g @code{allocate} and initialize an object of class @code{class}.      \g @code{allocate} and initialize an object of class @var{class}.
     ['] %alloc xt-new ;      ['] %alloc xt-new ;

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