\ data structures (like C structs)
\ Copyright (C) 1995 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:
\
\ struct
\ 1 cells: field search-method
\ 1 cells: field reveal-method
\ end-struct wordlist-map
\
\ The structure can then be extended in the following way
\ wordlist-map
\ 1 cells: field enum-method
\ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method
: nalign ( addr1 n -- addr2 )
\ addr2 is the aligned version of addr1 wrt the alignment size n
1- tuck + swap invert and ;
: field ( offset1 align1 size align -- offset2 align2 )
\ note: this version uses local variables
(Field) \ Header reveal dofield: cfa,
>r rot r@ nalign dup , ( align1 size offset )
+ swap r> nalign ;
: end-struct ( size align -- )
2constant ;
0 1 chars end-struct struct
\ : field ( offset1 align1 size align -- offset2 align2 )
\ create-field
\ does> ( addr1 -- addr2 )
\ @ + ;
\ I don't really like the "type:" syntax. Any other ideas? - anton
\ Also, this seems to be somewhat general. It probably belongs to some
\ other place
: cells: ( n -- size align )
cells cell ;
: doubles: ( n -- size align )
2* cells cell ;
: chars: ( n -- size align )
chars 1 chars ;
: floats: ( n -- size align )
floats 1 floats ;
: dfloats: ( n -- size align )
dfloats 1 dfloats ;
: sfloats: ( n -- size align )
sfloats 1 sfloats ;
: struct-align ( size align -- )
dp @ swap nalign dp !
drop ;
: struct-allot ( size align -- addr )
over swap struct-align
here swap allot ;
: struct-allocate ( size align -- addr ior )
drop allocate ;
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