[gforth] / gforth / struct.fs  

gforth: gforth/struct.fs

Diff for /gforth/struct.fs between version 1.7 and 1.11

version 1.7, Sat Oct 7 17:38:20 1995 UTC version 1.11, Fri Jun 6 17:27:58 1997 UTC
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Line 1 
 \ $Id$  \ data structures (like C structs)
   
   \ Copyright (C) 1995, 1997 Free Software Foundation, Inc.
   
   \ This file is part of Gforth.
   
   \ Gforth is free software; you can redistribute it and/or
   \ modify it under the terms of the GNU General Public License
   \ as published by the Free Software Foundation; either version 2
   \ of the License, or (at your option) any later version.
   
   \ This program is distributed in the hope that it will be useful,
   \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   \ GNU General Public License for more details.
   
   \ You should have received a copy of the GNU General Public License
   \ along with this program; if not, write to the Free Software
   \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   
   
 \ Usage example:  \ Usage example:
 \  \
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 \ addr2 is the aligned version of addr1 wrt the alignment size n  \ addr2 is the aligned version of addr1 wrt the alignment size n
  1- tuck +  swap invert and ;   1- tuck +  swap invert and ;
   
 : field ( offset1 align1 size align -- offset2 align2 )  : dozerofield ( -- )
 \ note: this version uses local variables      \ a field that makes no change
       \ to enable accessing the offset with "['] <field> >body @" this
       \ is not implemented with "['] noop alias"
       last @
       if
           immediate
       then
   does> ( -- )
       drop ;
   
   : field ( offset1 align1 size align "name" -- offset2 align2 ) \ gforth
       \G name execution: ( addr1 -- addr2 )
       >r rot r@ nalign dup
       if \ field offset <> 0
           [IFDEF]  (Field)
               (Field)
           [ELSE]
      Header reveal dofield: cfa,       Header reveal dofield: cfa,
         >r rot r@ nalign  dup ,  ( align1 size offset )          [THEN]
         + swap r> nalign ;      else
           create dozerofield
       then ( align1 size offset )
       dup , + swap r> nalign ;
   
 : end-struct ( size align -- )  : end-struct ( size align -- )
  2constant ;   2constant ;
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 : struct-allocate ( size align -- addr ior )  : struct-allocate ( size align -- addr ior )
     drop allocate ;      drop allocate ;
   
   : struct-alloc ( size align -- addr )
       struct-allocate throw ;

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  Added in v.1.11
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