[gforth] / gforth / prims2x.fs  

gforth: gforth/prims2x.fs

Diff for /gforth/prims2x.fs between version 1.125 and 1.126

version 1.125, Sat Dec 28 17:18:27 2002 UTC version 1.126, Tue Dec 31 14:50:53 2002 UTC
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     cell% 2* field stack-pointer \ stackpointer name      cell% 2* field stack-pointer \ stackpointer name
     cell%    field stack-type \ name for default type of stack items      cell%    field stack-type \ name for default type of stack items
     cell%    field stack-in-index-xt \ ( in-size item -- in-index )      cell%    field stack-in-index-xt \ ( in-size item -- in-index )
       cell%    field stack-access-transform \ ( nitem -- index )
 end-struct stack%  end-struct stack%
   
 struct%  struct%
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     1 next-stack-number +!      1 next-stack-number +!
     r@ stack-type !      r@ stack-type !
     save-mem r@ stack-pointer 2!      save-mem r@ stack-pointer 2!
     ['] stack-in-index r> stack-in-index-xt ! ;      ['] stack-in-index r@ stack-in-index-xt !
       ['] noop r@ stack-access-transform !
       rdrop ;
   
 : map-stacks { xt -- }  : map-stacks { xt -- }
     \ perform xt for all stacks      \ perform xt for all stacks
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 \ stack access stuff  \ stack access stuff
   
 : normal-stack-access1 ( n stack -- )  : normal-stack-access0 { n stack -- }
     stack-pointer 2@ type      n stack stack-access-transform @ execute ." [" 0 .r ." ]" ;
     dup  
     if  : normal-stack-access1 { n stack -- }
         ." [" 0 .r ." ]"      stack stack-pointer 2@ type
       n if
           n stack normal-stack-access0
     else      else
         drop ." TOS"          ." TOS"
     endif ;      endif ;
   
 : normal-stack-access ( n stack -- )  : normal-stack-access ( n stack -- )
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     stack stack-out @ 0<> stack stack-in @ 0= and      stack stack-out @ 0<> stack stack-in @ 0= and
     if      if
         ." IF_" stack stack-pointer 2@ 2dup type ." TOS("          ." IF_" stack stack-pointer 2@ 2dup type ." TOS("
         2dup type ." [0] = " type ." TOS);" cr          2dup type 0 stack normal-stack-access0 ."  = " type ." TOS);" cr
     endif ;      endif ;
   
 : flush-tos ( -- )  : flush-tos ( -- )
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     stack stack-out @ 0= stack stack-in @ 0<> and      stack stack-out @ 0= stack stack-in @ 0<> and
     if      if
         ." IF_" stack stack-pointer 2@ 2dup type ." TOS("          ." IF_" stack stack-pointer 2@ 2dup type ." TOS("
         2dup type ." TOS = " type ." [0]);" cr          2dup type ." TOS = " type 0 stack normal-stack-access0 ." );" cr
     endif ;      endif ;
   
 : fill-tos ( -- )  : fill-tos ( -- )
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 : fetches ( -- )  : fetches ( -- )
     prim prim-effect-in prim prim-effect-in-end @ ['] fetch map-items ;      prim prim-effect-in prim prim-effect-in-end @ ['] fetch map-items ;
   
   : stack-update-transform ( n1 stack -- n2 )
       \ n2 is the number by which the stack pointer should be
       \ incremented to pop n1 items
       stack-access-transform @ dup >r execute
       0 r> execute - ;
   
 : stack-pointer-update { stack -- }  : stack-pointer-update { stack -- }
     \ stacks grow downwards      \ stacks grow downwards
     stack stack-diff      stack stack-diff
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         stack inst-stream = if          stack inst-stream = if
             ." INC_IP(" 0 .r ." );" cr              ." INC_IP(" 0 .r ." );" cr
         else          else
             stack stack-pointer 2@ type ."  += " 0 .r ." ;" cr              stack stack-pointer 2@ type ."  += "
               stack stack-update-transform 0 .r ." ;" cr
         endif          endif
     endif ;      endif ;
   

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