Annotation of gforth/compat/struct.fs, revision 1.1
1.1 ! 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:
! 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:
! 38: : field ( offset1 align1 size align -- offset2 align2 )
! 39: create
! 40: >r rot r@ nalign dup , ( align1 size offset )
! 41: + swap r> nalign
! 42: does> ( addr1 -- addr2 )
! 43: @ + ;
! 44:
! 45: : end-struct ( size align -- )
! 46: 2constant ;
! 47:
! 48: 0 1 chars end-struct struct
! 49:
! 50: \ I don't really like the "type:" syntax. Any other ideas? - anton
! 51: \ Also, this seems to be somewhat general. It probably belongs to some
! 52: \ other place
! 53: : cells: ( n -- size align )
! 54: cells 1 cells ;
! 55:
! 56: : doubles: ( n -- size align )
! 57: 2* cells 1 cells ;
! 58:
! 59: : chars: ( n -- size align )
! 60: chars 1 chars ;
! 61:
! 62: : floats: ( n -- size align )
! 63: floats 1 floats ;
! 64:
! 65: : dfloats: ( n -- size align )
! 66: dfloats 1 dfloats ;
! 67:
! 68: : sfloats: ( n -- size align )
! 69: sfloats 1 sfloats ;
! 70:
! 71: : struct-align ( size align -- )
! 72: here swap nalign here - allot
! 73: drop ;
! 74:
! 75: : struct-allot ( size align -- addr )
! 76: over swap struct-align
! 77: here swap allot ;
! 78:
! 79: : struct-allocate ( size align -- addr ior )
! 80: drop allocate ;
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