[gforth] / gforth / objects.fs  

gforth: gforth/objects.fs

Diff for /gforth/objects.fs between version 1.9 and 1.10

version 1.9, Wed Oct 7 18:58:58 1998 UTC version 1.10, Sun Nov 22 21:23:25 1998 UTC
Line 96 
Line 96 
 interface%  interface%
     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      cell% 2* field class-inst-size ( class -- addr ) \ objects- objects
     \g used as @code{class-inst-size 2@ ( class -- align size )},      \g used as @code{class-inst-size 2@ ( class -- align size )},
     \g gives the size specification for an instance (i.e. an object)      \g gives the size specification for an instance (i.e. an object)
     \g of @code{class}.      \g of @code{class}.
Line 118 
Line 118 
   
 \ selectors and methods  \ selectors and methods
   
 variable current-interface ( -- addr ) \ objects  variable current-interface ( -- addr ) \ objects- objects
 \g this variable contains the class or interface currently being  \g this variable contains the class or interface currently being
 \g defined.  \g defined.
   
Line 139 
Line 139 
     swap object-map @ + @ ( object selector-body map )      swap object-map @ + @ ( object selector-body map )
     swap selector-offset @ + perform ;      swap selector-offset @ + perform ;
   
 : method ( xt "name" -- ) \ 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 creates selector @code{name} and makes @code{xt} its method in
     \g the current class.      \g the current class.
Line 154 
Line 154 
         do-class-method          do-class-method
     then ;      then ;
   
 : selector ( "name" -- ) \ objects  : selector ( "name" -- ) \ objects- objects
     \g @code{name} execution: @code{... object -- ...}@*      \g @code{name} execution: @code{... object -- ...}@*
     \g creates selector @code{name} for the current class and its      \g creates selector @code{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
Line 166 
Line 166 
     swap >body ( xt map selector-body )      swap >body ( xt map selector-body )
     selector-offset @ + ! ;      selector-offset @ + ! ;
   
 : class->map ( class -- map ) \ objects  : class->map ( class -- map ) \ objects- objects
     \g @code{map} is the pointer to @code{class}'s method map; it      \g @code{map} is the pointer to @code{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 @code{object-map}s point to).
Line 186 
Line 186 
         2drop          2drop
     then ;      then ;
   
 : class-override! ( xt sel-xt class-map -- ) \ 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 @code{xt} is the new method for the selector @code{sel-xt} in
     \g @code{class-map}.      \g @code{class-map}.
     over >body ( xt sel-xt class-map selector-body )      over >body ( xt sel-xt class-map selector-body )
Line 197 
Line 197 
     then      then
     interface-override! ;      interface-override! ;
   
 : overrides ( xt "selector" -- ) \ objects  : overrides ( xt "selector" -- ) \ objects- objects
     \g replace default method for @code{selector} in the current class      \g replace default method for @code{selector} in the current class
     \g with @code{xt}. @code{overrides} must not be used during an      \g with @code{xt}. @code{overrides} must not be used during an
     \g interface definition.      \g interface definition.
Line 208 
Line 208 
 \ every interface gets a different offset; the latest one is stored here  \ every interface gets a different offset; the latest one is stored here
 variable last-interface-offset 0 last-interface-offset !  variable last-interface-offset 0 last-interface-offset !
   
 : interface ( -- ) \ objects  : interface ( -- ) \ objects- objects
     \g starts an interface definition.      \g starts an interface definition.
     interface% %allot >r      interface% %allot >r
     r@ current-interface !      r@ current-interface !
Line 217 
Line 217 
     last-interface-offset @ r@ interface-offset !      last-interface-offset @ r@ interface-offset !
     0 r> interface-map-offset ! ;      0 r> interface-map-offset ! ;
   
 : end-interface-noname ( -- interface ) \ objects  : end-interface-noname ( -- interface ) \ objects- objects
     \g ends an interface definition. The resulting interface is      \g ends an interface definition. The resulting interface is
     \g @code{interface}.      \g @code{interface}.
     current-interface @ ;      current-interface @ ;
   
 : end-interface ( "name" -- ) \ 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 ends an interface definition. The resulting interface is
     \g @code{interface}.      \g @code{interface}.
Line 237 
Line 237 
     then      then
     r> class-wordlist @ swap 1+ ;      r> class-wordlist @ swap 1+ ;
   
 : push-order ( class -- ) \ objects  : push-order ( class -- ) \ objects- objects
     \g add @code{class}'s wordlists to the search-order (in front)      \g add @code{class}'s wordlists to the search-order (in front)
     >r get-order r> add-class-order set-order ;      >r get-order r> add-class-order set-order ;
   
 : class ( parent-class -- align offset ) \ 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 @code{parent-class}. @code{align offset} are for use by
     \g @code{field} etc.      \g @code{field} etc.
Line 264 
Line 264 
     until      until
     drop ;      drop ;
   
 : drop-order ( class -- ) \ objects  : drop-order ( class -- ) \ objects- objects
     \g drops @code{class}'s wordlists from the search order. No      \g drops @code{class}'s wordlists from the search order. No
     \g checking is made whether @code{class}'s wordlists are actually      \g checking is made whether @code{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  : end-class-noname ( align offset -- class ) \ objects- objects
     \g ends a class definition. The resulting class is @code{class}.      \g ends a class definition. The resulting class is @code{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  : end-class ( align offset "name" -- ) \ objects- objects
     \g @code{name} execution: @code{-- class}@*      \g @code{name} execution: @code{-- class}@*
     \g ends a class definition. The resulting class is @code{class}.      \g ends a class definition. The resulting class is @code{class}.
     \ name execution: ( -- class )      \ name execution: ( -- class )
Line 285 
Line 285 
   
 variable public-wordlist  variable public-wordlist
   
 : protected ( -- ) \ 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 <>
Line 294 
Line 294 
     then      then
     set-current ;      set-current ;
   
 : public ( -- ) \ 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.
Line 310 
Line 310 
     free throw      free throw
     r> dup r> ;      r> dup r> ;
   
 : implementation ( interface -- ) \ objects  : implementation ( interface -- ) \ objects- objects
     \g the current class implements @code{interface}. I.e., you can      \g the current class implements @code{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.
Line 332 
Line 332 
 \ this/self, instance variables etc.  \ this/self, instance variables etc.
   
 \ rename "this" into "self" if you are a Smalltalk fiend  \ rename "this" into "self" if you are a Smalltalk fiend
 0 value this ( -- object ) \ 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  : to-this ( object -- ) \ objects- objects
     \g sets @code{this} (used internally, but useful when debugging).      \g sets @code{this} (used internally, but useful when debugging).
     TO this ;      TO this ;
   
Line 345 
Line 345 
 \ : to-this ( object -- )  \ : to-this ( object -- )
 \     thisp ! ;  \     thisp ! ;
   
 : m: ( -- xt colon-sys; run-time: object -- ) \ 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; @code{object} becomes new @code{this}.
     :noname      :noname
     POSTPONE this      POSTPONE this
     POSTPONE >r      POSTPONE >r
     POSTPONE to-this ;      POSTPONE to-this ;
   
 : exitm ( -- ) \ objects  : exitm ( -- ) \ objects- objects
     \g @code{exit} from a method; restore old @code{this}.      \g @code{exit} from a method; restore old @code{this}.
     POSTPONE r>      POSTPONE r>
     POSTPONE to-this      POSTPONE to-this
     POSTPONE exit ; immediate      POSTPONE exit ; immediate
   
 : ;m ( colon-sys --; run-time: -- ) \ 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
Line 384 
Line 384 
 does> \ name execution: ( -- addr )  does> \ name execution: ( -- addr )
     ( addr1 ) @ this + ;      ( addr1 ) @ this + ;
   
 : inst-var ( align1 offset1 align size "name" -- align2 offset2 ) \ objects  : inst-var ( align1 offset1 align size "name" -- align2 offset2 ) \ objects- objects
     \g @code{name} execution: @code{-- addr}@*      \g @code{name} execution: @code{-- addr}@*
     \g @code{addr} is the address of the field @code{name} in      \g @code{addr} is the address of the field @code{name} in
     \g @code{this} object.      \g @code{this} object.
Line 394 
Line 394 
 does> \ name execution: ( -- w )  does> \ name execution: ( -- w )
     ( addr1 ) @ this + @ ;      ( addr1 ) @ this + @ ;
   
 : inst-value ( align1 offset1 "name" -- align2 offset2 ) \ objects  : inst-value ( align1 offset1 "name" -- align2 offset2 ) \ objects- objects
     \g @code{name} execution: @code{-- w}@*      \g @code{name} execution: @code{-- w}@*
     \g @code{w} is the value of the field @code{name} in @code{this}      \g @code{w} is the value of the field @code{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  : <to-inst> ( w xt -- ) \ objects- objects
     \g store @code{w} into the field @code{xt} in @code{this} object.      \g store @code{w} into the field @code{xt} in @code{this} object.
     >body @ this + ! ;      >body @ this + ! ;
   
 : [to-inst] ( compile-time: "name" -- ; run-time: w -- ) \ 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 @code{w} into field @code{name} in @code{this} object.
     ' >body @ POSTPONE literal      ' >body @ POSTPONE literal
     POSTPONE this      POSTPONE this
Line 413 
Line 413 
   
 \ class binding stuff  \ class binding stuff
   
 : <bind> ( class selector-xt -- xt ) \ objects  : <bind> ( class selector-xt -- xt ) \ objects- objects
     \g @code{xt} is the method for the selector @code{selector-xt} in      \g @code{xt} is the method for the selector @code{selector-xt} in
     \g @code{class}.      \g @code{class}.
     >body swap class->map over selector-interface @      >body swap class->map over selector-interface @
Line 422 
Line 422 
     then      then
     swap selector-offset @ + @ ;      swap selector-offset @ + @ ;
   
 : bind' ( "class" "selector" -- xt ) \ objects  : bind' ( "class" "selector" -- xt ) \ objects- objects
     \g @code{xt} is the method for @code{selector} in @code{class}.      \g @code{xt} is the method for @code{selector} in @code{class}.
     ' execute ' <bind> ;      ' execute ' <bind> ;
   
 : bind ( ... "class" "selector" -- ... ) \ objects  : bind ( ... "class" "selector" -- ... ) \ objects- objects
     \g execute the method for @code{selector} in @code{class}.      \g execute the method for @code{selector} in @code{class}.
     bind' execute ;      bind' execute ;
   
 : [bind] ( compile-time: "class" "selector" -- ; run-time: ... object -- ... ) \ 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 @code{selector} in @code{class}.
     bind' compile, ; immediate      bind' compile, ; immediate
   
 : current' ( "selector" -- xt ) \ objects  : current' ( "selector" -- xt ) \ objects- objects
     \g @code{xt} is the method for @code{selector} in the current class.      \g @code{xt} is the method for @code{selector} in the current class.
     current-interface @ ' <bind> ;      current-interface @ ' <bind> ;
   
 : [current] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ 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 @code{selector} in the current class.
     current' compile, ; immediate      current' compile, ; immediate
   
 : [parent] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ 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 @code{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
Line 462 
Line 462 
 current-interface @ push-order  current-interface @ push-order
   
 ' drop ( object -- )  ' drop ( object -- )
 method construct ( ... object -- ) \ objects  method construct ( ... object -- ) \ objects- objects
 \g initializes the data fields of @code{object}. The method for the  \g initializes the data fields of @code{object}. The method for the
 \g class @code{object} just does nothing @code{( object -- )}.  \g class @code{object} just does nothing @code{( object -- )}.
   
 :noname ( object -- )  :noname ( object -- )
     ." object:" dup . ." class:" object-map @ @ . ;      ." object:" dup . ." class:" object-map @ @ . ;
 method print ( object -- ) \ objects  method print ( object -- ) \ objects- objects
 \g prints the object. The method for the class @code{object} prints  \g prints the object. The method for the class @code{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  end-class object ( -- class ) \ objects- objects
 \g the ancestor of all classes.  \g the ancestor of all classes.
   
 \ constructing objects  \ constructing objects
   
 : init-object ( ... class object -- ) \ objects  : init-object ( ... class object -- ) \ objects- objects
     \g initializes a chunk of memory (@code{object}) to an object of      \g initializes a chunk of memory (@code{object}) to an object of
     \g class @code{class}; then performs @code{construct}.      \g class @code{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  : xt-new ( ... class xt -- object ) \ objects- objects
     \g makes a new object, using @code{xt ( align size -- addr )} to      \g makes 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  : 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 @code{class} in
     \g the dictionary.      \g the dictionary.
     ['] %allot xt-new ;      ['] %allot xt-new ;
   
 : heap-new ( ... class -- object ) \ 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 @code{class}.
     ['] %alloc xt-new ;      ['] %alloc xt-new ;

Generate output suitable for use with a patch program
Legend:
Removed from v.1.9  
changed lines
  Added in v.1.10
CVS Admin

Powered by ViewCVS 1.0-dev 		(Powered by ViewCVS)

ViewCVS and CVS Help