\ $Id: struct.fs,v 1.1.1.1 1994/02/11 16:30:48 anton Exp $
\ 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
\ 2, 2constant and nalign should be somewhere else
: 2, ( w1 w2 -- )
here 2 cells allot 2! ;
: 2constant ( w1 w2 -- )
create 2,
does> ( -- w1 w2 )
2@ ;
: nalign ( addr1 n -- addr2 )
\ addr2 is the aligned version of addr1 wrt the alignment size n
1- tuck + swap invert and ;
: create-field ( offset1 align1 size align -- offset2 align2 )
\ note: this version uses local variables
create
>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 ;
\ dfoats and sfloats is not yet defined
\ : dfloats: ( n -- size align )
\ dfloats 1 dfloats ;
\
\ : sfloats: ( n -- size align )
\ sfloats 1 sfloats ;
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