Annotation of gforth/struct.fs, revision 1.9

1.8       anton       1: \ data structures (like C structs)
                      2: 
                      3: \ Copyright (C) 1995 Free Software Foundation, Inc.
                      4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
                      9: \ as published by the Free Software Foundation; either version 2
                     10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
                     18: \ along with this program; if not, write to the Free Software
                     19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     20: 
1.1       anton      21: 
                     22: \ Usage example:
                     23: \
                     24: \ struct
                     25: \     1 cells: field search-method
                     26: \     1 cells: field reveal-method
                     27: \ end-struct wordlist-map
                     28: \
                     29: \ The structure can then be extended in the following way
                     30: \ wordlist-map
                     31: \     1 cells: field enum-method
                     32: \ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method
                     33: 
                     34: : nalign ( addr1 n -- addr2 )
                     35: \ addr2 is the aligned version of addr1 wrt the alignment size n
                     36:  1- tuck +  swap invert and ;
                     37: 
1.3       pazsan     38: : field ( offset1 align1 size align -- offset2 align2 )
1.1       anton      39: \ note: this version uses local variables
1.9     ! pazsan     40:     (Field) \  Header reveal dofield: cfa,
1.1       anton      41:        >r rot r@ nalign  dup ,  ( align1 size offset )
                     42:        + swap r> nalign ;
                     43: 
                     44: : end-struct ( size align -- )
                     45:  2constant ;
                     46: 
                     47: 0 1 chars end-struct struct
                     48: 
1.3       pazsan     49: \ : field  ( offset1 align1 size align -- offset2 align2 )
                     50: \    create-field
                     51: \    does> ( addr1 -- addr2 )
                     52: \      @ + ;
1.1       anton      53: 
                     54: \ I don't really like the "type:" syntax. Any other ideas? - anton
                     55: \ Also, this seems to be somewhat general. It probably belongs to some
                     56: \ other place
                     57: : cells: ( n -- size align )
                     58:     cells cell ;
                     59: 
                     60: : doubles: ( n -- size align )
                     61:     2* cells cell ;
                     62: 
                     63: : chars: ( n -- size align )
                     64:     chars 1 chars ;
                     65: 
                     66: : floats: ( n -- size align )
                     67:     floats 1 floats ;
                     68: 
1.5       pazsan     69: : dfloats: ( n -- size align )
                     70:     dfloats 1 dfloats ;
1.2       anton      71: 
1.5       pazsan     72: : sfloats: ( n -- size align )
                     73:     sfloats 1 sfloats ;
                     74: 
1.2       anton      75: : struct-align ( size align -- )
                     76:     dp @ swap nalign dp !
                     77:     drop ;
                     78: 
                     79: : struct-allot ( size align -- addr )
                     80:     over swap struct-align
                     81:     here swap allot ;
                     82: 
1.5       pazsan     83: : struct-allocate ( size align -- addr ior )
1.2       anton      84:     drop allocate ;

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