Diff for /gforth/Attic/prims2y.fs between versions 1.1 and 1.2

version 1.1, 2003/09/08 13:05:15 version 1.2, 2003/09/21 18:54:38
Line 188  struct% Line 188  struct%
     cell%    field type-store \ xt of store code generator ( item -- )      cell%    field type-store \ xt of store code generator ( item -- )
 end-struct type%  end-struct type%
   
   struct%
       cell%    field register-number
       cell%    field register-type \ pointer to type
       cell% 2* field register-name \ c name
   end-struct register%
   
   struct%
       cell% 2* field ss-registers  \ addr u; ss-registers[0] is TOS
       cell%    field ss-offset     \ stack pointer offset: sp[-offset] is TOS
   end-struct ss% \ stack-state
   
   struct%
       cell% max-stacks * field state-sss
   end-struct state%
   
 variable next-stack-number 0 next-stack-number !  variable next-stack-number 0 next-stack-number !
 create stacks max-stacks cells allot \ array of stacks  create stacks max-stacks cells allot \ array of stacks
   256 constant max-registers
   create registers max-registers cells allot \ array of registers
   variable nregisters 0 nregisters ! \ number of registers
   
 : stack-in-index ( in-size item -- in-index )  : stack-in-index ( in-size item -- in-index )
     item-offset @ - 1- ;      item-offset @ - 1- ;
Line 614  does> ( item -- ) Line 632  does> ( item -- )
 wordlist constant type-names \ this is here just to meet the requirement  wordlist constant type-names \ this is here just to meet the requirement
                     \ that a type be a word; it is never used for lookup                      \ that a type be a word; it is never used for lookup
   
   : define-type ( addr u -- xt )
       \ define single type with name addr u, without stack
       get-current type-names set-current >r
       2dup nextname stack-type-name
       r> set-current
       latestxt ;
   
 : stack ( "name" "stack-pointer" "type" -- )  : stack ( "name" "stack-pointer" "type" -- )
     \ define stack      \ define stack
     name { d: stack-name }      name { d: stack-name }
     name { d: stack-pointer }      name { d: stack-pointer }
     name { d: stack-type }      name { d: stack-type }
     get-current type-names set-current      stack-type define-type
     stack-type 2dup nextname stack-type-name      stack-pointer rot >body stack-name nextname make-stack ;
     set-current  
     stack-pointer latestxt >body stack-name nextname make-stack ;  
   
 stack inst-stream IP Cell  stack inst-stream IP Cell
 ' inst-in-index inst-stream stack-in-index-xt !  ' inst-in-index inst-stream stack-in-index-xt !
 ' inst-stream <is> inst-stream-f  ' inst-stream <is> inst-stream-f
 \ !! initialize stack-in and stack-out  \ !! initialize stack-in and stack-out
   
   \ registers
   
   : make-register ( type addr u -- )
       \ define register with type TYPE and name ADDR U.
       nregisters @ max-registers < s" too many registers" ?print-error
       2dup nextname create register% %allot >r
       r@ register-name 2!
       r@ register-type !
       nregisters @ r@ register-number !
       1 nregisters +!
       rdrop ;
   
   : register ( "name" "type" -- )
       \ define register
       name { d: reg-name }
       name { d: reg-type }
       reg-type define-type >body
       reg-name make-register ;
   
   \ stack-states
   
   : stack-state ( a-addr u uoffset "name" -- )
       create ss% %allot >r
       r@ ss-offset !
       r@ ss-registers 2!
       rdrop ;
   
   0 0 0 stack-state default-ss
   
   \ state
   
   : state ( "name" -- )
       \ create a state initialized with default-sss
       create state% %allot state-sss { sss }
       max-stacks 0 ?do
           default-ss sss i th !
       loop ;
   
   : set-ss ( ss stack state -- )
       state-sss swap stack-number @ th ! ;
   
 \ offset computation  \ offset computation
 \ the leftmost (i.e. deepest) item has offset 0  \ the leftmost (i.e. deepest) item has offset 0
 \ the rightmost item has the highest offset  \ the rightmost item has the highest offset

Removed from v.1.1  
changed lines
  Added in v.1.2


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