version 1.4, 1997/06/23 15:53:53
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version 1.10, 1998/11/22 21:23:25
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Line 41
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Line 41
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\ helper words |
\ helper words |
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s" gforth" environment? [if] |
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2drop |
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[else] |
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: -rot ( a b c -- c a b ) |
: -rot ( a b c -- c a b ) |
rot rot ; |
rot rot ; |
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: under+ ( a b c -- a+c b ) |
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rot + swap ; |
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: perform ( ... addr -- ... ) |
: perform ( ... addr -- ... ) |
@ execute ; |
@ execute ; |
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Line 73
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Line 74
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over >r + dup >r resize throw |
over >r + dup >r resize throw |
r> over r> + -rot ; |
r> over r> + -rot ; |
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: \g ( -- ) |
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postpone \ ; immediate |
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[then] |
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\ data structures |
\ data structures |
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struct |
struct |
Line 90 end-struct interface%
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Line 95 end-struct interface%
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interface% |
interface% |
cell% field class-parent |
cell% field class-parent |
cell% field class-wordlist \ instance variables and other private words |
cell% field class-wordlist \ inst-vars and other protected words |
cell% 2* field class-inst-size \ size and alignment |
cell% 2* field class-inst-size ( class -- addr ) \ objects- objects |
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\g used as @code{class-inst-size 2@ ( class -- align size )}, |
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\g gives the size specification for an instance (i.e. an object) |
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\g of @code{class}. |
end-struct class% |
end-struct class% |
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struct |
struct |
Line 110 end-struct selector%
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Line 118 end-struct selector%
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\ selectors and methods |
\ selectors and methods |
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variable current-interface |
variable current-interface ( -- addr ) \ objects- objects |
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\g this variable contains the class or interface currently being |
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\g defined. |
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: no-method ( -- ) |
: no-method ( -- ) |
true abort" no method defined for this object/selector combination" ; |
true abort" no method defined for this object/selector combination" ; |
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: do-class-method ( -- ) |
: do-class-method ( -- ) |
does> ( ... object -- ... ) |
does> ( ... object -- ... ) |
( object ) |
( object selector-body ) |
selector-offset @ over object-map @ + ( object xtp ) perform ; |
selector-offset @ over object-map @ + ( object xtp ) perform ; |
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: do-interface-method ( -- ) |
: do-interface-method ( -- ) |
Line 127 does> ( ... object -- ... )
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Line 139 does> ( ... object -- ... )
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swap object-map @ + @ ( object selector-body map ) |
swap object-map @ + @ ( object selector-body map ) |
swap selector-offset @ + perform ; |
swap selector-offset @ + perform ; |
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: method ( xt "name" -- ) |
: method ( xt "name" -- ) \ objects- objects |
\ define selector with method xt |
\g @code{name} execution: @code{... object -- ...}@* |
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\g creates selector @code{name} and makes @code{xt} its method in |
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\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 ) |
dup current-interface @ interface-map-offset @ - , |
dup current-interface @ interface-map-offset @ - , |
Line 140 does> ( ... object -- ... )
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Line 154 does> ( ... object -- ... )
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do-class-method |
do-class-method |
then ; |
then ; |
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: selector ( "name" -- ) |
: selector ( "name" -- ) \ objects- objects |
\ define a method selector for later overriding in subclasses |
\g @code{name} execution: @code{... object -- ...}@* |
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\g creates selector @code{name} for the current class and its |
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\g descendents; you can set a method for the selector in the |
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\g current class with @code{overrides}. |
['] no-method method ; |
['] no-method method ; |
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: interface-override! ( xt sel-xt interface-map -- ) |
: interface-override! ( xt sel-xt interface-map -- ) |
Line 149 does> ( ... object -- ... )
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Line 166 does> ( ... object -- ... )
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swap >body ( xt map selector-body ) |
swap >body ( xt map selector-body ) |
selector-offset @ + ! ; |
selector-offset @ + ! ; |
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: class->map ( class -- map ) |
: class->map ( class -- map ) \ objects- objects |
\ compute the (object-)map for the class |
\g @code{map} is the pointer to @code{class}'s method map; it |
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\g points to the place in the map to which the selector offsets |
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\g refer (i.e., where @code{object-map}s point to). |
dup interface-map 2@ drop swap interface-map-offset @ + ; |
dup interface-map 2@ drop swap interface-map-offset @ + ; |
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: unique-interface-map ( class-map offset -- ) |
: unique-interface-map ( class-map offset -- ) |
Line 158 does> ( ... object -- ... )
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Line 177 does> ( ... object -- ... )
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\ copy it to make it unique; used for implementing a copy-on-write policy |
\ copy it to make it unique; used for implementing a copy-on-write policy |
over @ class-parent @ class->map ( class-map offset parent-map ) |
over @ class-parent @ class->map ( class-map offset parent-map ) |
over + @ >r \ the map for the interface for the parent |
over + @ >r \ the map for the interface for the parent |
+ dup @ ( mapp map ) |
+ dup @ ( interface-mapp interface-map ) |
dup r> = |
dup r> = |
if |
if |
@ interface-map 2@ save-mem drop |
dup @ interface-map 2@ nip save-mem drop |
swap ! |
swap ! |
else |
else |
2drop |
2drop |
then ; |
then ; |
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: class-override! ( xt sel-xt class-map -- ) |
: class-override! ( xt sel-xt class-map -- ) \ objects- objects |
\ xt is the new method for the selector sel-xt in class-map |
\g @code{xt} is the new method for the selector @code{sel-xt} in |
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\g @code{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 |
Line 177 does> ( ... object -- ... )
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Line 197 does> ( ... object -- ... )
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then |
then |
interface-override! ; |
interface-override! ; |
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: overrides ( xt "selector" -- ) |
: overrides ( xt "selector" -- ) \ objects- objects |
\ replace default method "method" in the current class with xt |
\g replace default method for @code{selector} in the current class |
\ must not be used during an interface definition |
\g with @code{xt}. @code{overrides} must not be used during an |
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\g interface definition. |
' current-interface @ class->map class-override! ; |
' current-interface @ class->map class-override! ; |
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\ interfaces |
\ interfaces |
Line 187 does> ( ... object -- ... )
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Line 208 does> ( ... object -- ... )
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\ 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 ! |
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: interface ( -- ) |
: interface ( -- ) \ objects- objects |
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\g starts an interface definition. |
interface% %allot >r |
interface% %allot >r |
0 0 r@ interface-map 2! |
r@ current-interface ! |
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current-interface 1 cells save-mem r@ interface-map 2! |
-1 cells last-interface-offset +! |
-1 cells last-interface-offset +! |
last-interface-offset @ r@ interface-offset ! |
last-interface-offset @ r@ interface-offset ! |
0 r@ interface-map-offset ! |
0 r> interface-map-offset ! ; |
r> current-interface ! ; |
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: end-interface-noname ( -- interface ) |
: end-interface-noname ( -- interface ) \ objects- objects |
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\g ends an interface definition. The resulting interface is |
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\g @code{interface}. |
current-interface @ ; |
current-interface @ ; |
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: end-interface ( "name" -- ) |
: end-interface ( "name" -- ) \ objects- objects |
\ name execution: ( -- interface ) |
\g @code{name} execution: @code{-- interface}@* |
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\g ends an interface definition. The resulting interface is |
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\g @code{interface}. |
end-interface-noname constant ; |
end-interface-noname constant ; |
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\ classes |
\ classes |
Line 211 variable last-interface-offset 0 last-in
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Line 237 variable last-interface-offset 0 last-in
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then |
then |
r> class-wordlist @ swap 1+ ; |
r> class-wordlist @ swap 1+ ; |
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: push-order ( class -- ) |
: push-order ( class -- ) \ objects- objects |
\ add the class's wordlist 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 ; |
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: class ( parent-class -- align size ) |
: class ( parent-class -- align offset ) \ objects- objects |
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\g start a new class definition as a child of |
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\g @code{parent-class}. @code{align offset} are for use by |
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\g @code{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 ! |
Line 235 variable last-interface-offset 0 last-in
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Line 264 variable last-interface-offset 0 last-in
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until |
until |
drop ; |
drop ; |
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: drop-order ( class -- ) |
: drop-order ( class -- ) \ objects- objects |
\ note: no checks, whether the wordlists are correct |
\g drops @code{class}'s wordlists from the search order. No |
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\g checking is made whether @code{class}'s wordlists are actually |
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\g on the search order. |
>r get-order r> remove-class-order set-order ; |
>r get-order r> remove-class-order set-order ; |
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: end-class-noname ( align size -- class ) |
: end-class-noname ( align offset -- class ) \ objects- objects |
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\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 ; |
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: end-class ( align size "name" -- ) |
: end-class ( align offset "name" -- ) \ objects- objects |
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\g @code{name} execution: @code{-- class}@* |
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\g ends a class definition. The resulting class is @code{class}. |
\ name execution: ( -- class ) |
\ name execution: ( -- class ) |
end-class-noname constant ; |
end-class-noname constant ; |
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Line 251 variable last-interface-offset 0 last-in
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Line 285 variable last-interface-offset 0 last-in
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variable public-wordlist |
variable public-wordlist |
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: protected ( -- ) |
: protected ( -- ) \ objects- objects |
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\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 |
Line 259 variable public-wordlist
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Line 294 variable public-wordlist
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then |
then |
set-current ; |
set-current ; |
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: public ( -- ) |
: public ( -- ) \ objects- objects |
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\g restore the compilation wordlist that was in effect before the |
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\g last @code{protected} that actually changed the compilation |
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\g wordlist. |
public-wordlist @ set-current ; |
public-wordlist @ set-current ; |
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\ classes that implement interfaces |
\ classes that implement interfaces |
Line 272 variable public-wordlist
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Line 310 variable public-wordlist
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free throw |
free throw |
r> dup r> ; |
r> dup r> ; |
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: implementation ( interface -- ) |
: implementation ( interface -- ) \ objects- objects |
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\g the current class implements @code{interface}. I.e., you can |
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\g use all selectors of the interface in the current class and its |
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\g descendents. |
dup interface-offset @ ( interface offset ) |
dup interface-offset @ ( interface offset ) |
current-interface @ interface-map-offset @ negate over - dup 0> |
current-interface @ interface-map-offset @ negate over - dup 0> |
if \ the interface does not fit in the present class-map |
if \ the interface does not fit in the present class-map |
Line 291 variable public-wordlist
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Line 332 variable public-wordlist
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\ this/self, instance variables etc. |
\ this/self, instance variables etc. |
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\ rename "this" into "self" if you are a Smalltalk fiend |
\ rename "this" into "self" if you are a Smalltalk fiend |
0 value this ( -- object ) |
0 value this ( -- object ) \ objects- objects |
: to-this ( object -- ) |
\g the receiving object of the current method (aka active object). |
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: to-this ( object -- ) \ objects- objects |
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\g sets @code{this} (used internally, but useful when debugging). |
TO this ; |
TO this ; |
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\ another implementation, if you don't have (fast) values |
\ another implementation, if you don't have (fast) values |
Line 302 variable public-wordlist
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Line 345 variable public-wordlist
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\ : to-this ( object -- ) |
\ : to-this ( object -- ) |
\ thisp ! ; |
\ thisp ! ; |
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: m: ( -- xt colon-sys ) ( run-time: object -- ) |
: m: ( -- xt colon-sys; run-time: object -- ) \ objects- objects |
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\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 ; |
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: ;m ( colon-sys -- ) ( run-time: -- ) |
: exitm ( -- ) \ objects- objects |
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\g @code{exit} from a method; restore old @code{this}. |
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POSTPONE r> |
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POSTPONE to-this |
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POSTPONE exit ; immediate |
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: ;m ( colon-sys --; run-time: -- ) \ objects- objects |
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\g end a method definition; restore old @code{this}. |
POSTPONE r> |
POSTPONE r> |
POSTPONE to-this |
POSTPONE to-this |
POSTPONE ; ; immediate |
POSTPONE ; ; immediate |
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: catch ( ... xt -- ... n ) |
: 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 ; |
Line 333 variable public-wordlist
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Line 384 variable public-wordlist
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does> \ name execution: ( -- addr ) |
does> \ name execution: ( -- addr ) |
( addr1 ) @ this + ; |
( addr1 ) @ this + ; |
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: inst-var ( align1 offset1 align size "name" -- align2 offset2 ) |
: inst-var ( align1 offset1 align size "name" -- align2 offset2 ) \ objects- objects |
\ name execution: ( -- addr ) |
\g @code{name} execution: @code{-- addr}@* |
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\g @code{addr} is the address of the field @code{name} in |
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\g @code{this} object. |
['] do-inst-var inst-something ; |
['] do-inst-var inst-something ; |
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: do-inst-value ( -- ) |
: do-inst-value ( -- ) |
does> \ name execution: ( -- w ) |
does> \ name execution: ( -- w ) |
( addr1 ) @ this + @ ; |
( addr1 ) @ this + @ ; |
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: inst-value ( align1 offset1 "name" -- align2 offset2 ) |
: inst-value ( align1 offset1 "name" -- align2 offset2 ) \ objects- objects |
\ name execution: ( -- w ) |
\g @code{name} execution: @code{-- w}@* |
\ a cell-sized value-flavoured instance field |
\g @code{w} is the value of the field @code{name} in @code{this} |
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\g object. |
cell% ['] do-inst-value inst-something ; |
cell% ['] do-inst-value inst-something ; |
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: <to-inst> ( w xt -- ) |
: <to-inst> ( w xt -- ) \ objects- objects |
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\g store @code{w} into the field @code{xt} in @code{this} object. |
>body @ this + ! ; |
>body @ this + ! ; |
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: [to-inst] ( compile-time: "name" -- ; run-time: w -- ) |
: [to-inst] ( compile-time: "name" -- ; run-time: w -- ) \ objects- objects |
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\g store @code{w} into field @code{name} in @code{this} object. |
' >body @ POSTPONE literal |
' >body @ POSTPONE literal |
POSTPONE this |
POSTPONE this |
POSTPONE + |
POSTPONE + |
Line 357 does> \ name execution: ( -- w )
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Line 413 does> \ name execution: ( -- w )
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\ class binding stuff |
\ class binding stuff |
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: <bind> ( class selector-xt -- xt ) |
: <bind> ( class selector-xt -- xt ) \ objects- objects |
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\g @code{xt} is the method for the selector @code{selector-xt} in |
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\g @code{class}. |
>body swap class->map over selector-interface @ |
>body swap class->map over selector-interface @ |
?dup-if |
?dup-if |
+ @ |
+ @ |
then |
then |
swap selector-offset @ + @ ; |
swap selector-offset @ + @ ; |
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: bind' ( "class" "selector" -- xt ) |
: bind' ( "class" "selector" -- xt ) \ objects- objects |
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\g @code{xt} is the method for @code{selector} in @code{class}. |
' execute ' <bind> ; |
' execute ' <bind> ; |
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: bind ( ... object "class" "selector" -- ... ) |
: bind ( ... "class" "selector" -- ... ) \ objects- objects |
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\g execute the method for @code{selector} in @code{class}. |
bind' execute ; |
bind' execute ; |
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: [bind] ( compile-time: "class" "selector" -- ; run-time: ... object -- ... ) |
: [bind] ( compile-time: "class" "selector" -- ; run-time: ... object -- ... ) \ objects- objects |
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\g compile the method for @code{selector} in @code{class}. |
bind' compile, ; immediate |
bind' compile, ; immediate |
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: current' ( "selector" -- xt ) |
: current' ( "selector" -- xt ) \ objects- objects |
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\g @code{xt} is the method for @code{selector} in the current class. |
current-interface @ ' <bind> ; |
current-interface @ ' <bind> ; |
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: [current] ( compile-time: "selector" -- ; run-time: ... object -- ... ) |
: [current] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects |
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\g compile the method for @code{selector} in the current class. |
current' compile, ; immediate |
current' compile, ; immediate |
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: [parent] ( compile-time: "selector" -- ; run-time: ... object -- ... ) |
: [parent] ( compile-time: "selector" -- ; run-time: ... object -- ... ) \ objects- objects |
\ same as `[bind] "parent" "selector"', where "parent" is the |
\g compile the method for @code{selector} in the parent of the |
\ parent class of the current class |
\g current class. |
current-interface @ class-parent @ ' <bind> compile, ; immediate |
current-interface @ class-parent @ ' <bind> compile, ; immediate |
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\ the object class |
\ the object class |
Line 398 wordlist current-interface @ class-wordl
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Line 461 wordlist current-interface @ class-wordl
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object% |
object% |
current-interface @ push-order |
current-interface @ push-order |
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:noname ( object -- ) |
' drop ( object -- ) |
drop ; |
method construct ( ... object -- ) \ objects- objects |
method construct ( ... object -- ) |
\g initializes the data fields of @code{object}. The method for the |
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\g class @code{object} just does nothing @code{( object -- )}. |
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:noname ( object -- ) |
:noname ( object -- ) |
." object:" dup . ." class:" object-map @ @ . ; |
." object:" dup . ." class:" object-map @ @ . ; |
method print |
method print ( object -- ) \ objects- objects |
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\g prints the object. The method for the class @code{object} prints |
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\g the address of the object and the address of its class. |
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end-class object |
end-class object ( -- class ) \ objects- objects |
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\g the ancestor of all classes. |
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\ constructing objects |
\ constructing objects |
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: init-object ( ... class object -- ) |
: init-object ( ... class object -- ) \ objects- objects |
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\g initializes a chunk of memory (@code{object}) to an object of |
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\g class @code{class}; then performs @code{construct}. |
swap class->map over object-map ! ( ... object ) |
swap class->map over object-map ! ( ... object ) |
construct ; |
construct ; |
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: xt-new ( ... class xt -- object ) |
: xt-new ( ... class xt -- object ) \ objects- objects |
\ makes a new object, using XT ( align size -- addr ) to allocate memory |
\g makes a new object, using @code{xt ( align size -- addr )} to |
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\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> ; |
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: dict-new ( ... class -- object ) |
: dict-new ( ... class -- object ) \ objects- objects |
\ makes a new object HERE in dictionary |
\g @code{allot} and initialize an object of class @code{class} in |
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\g the dictionary. |
['] %allot xt-new ; |
['] %allot xt-new ; |
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: heap-new ( ... class -- object ) |
: heap-new ( ... class -- object ) \ objects- objects |
\ makes a new object in ALLOCATEd memory |
\g @code{allocate} and initialize an object of class @code{class}. |
['] %alloc xt-new ; |
['] %alloc xt-new ; |