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| 1 : | anton | 1.1 | \ 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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