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| 1 : | pazsan | 1.3 | \ $Id: struct.fs,v 1.2 1994/07/29 11:16:26 anton Exp $ |
| 2 : | anton | 1.1 | |
| 3 : | \ Usage example: | ||
| 4 : | \ | ||
| 5 : | \ struct | ||
| 6 : | \ 1 cells: field search-method | ||
| 7 : | \ 1 cells: field reveal-method | ||
| 8 : | \ end-struct wordlist-map | ||
| 9 : | \ | ||
| 10 : | \ The structure can then be extended in the following way | ||
| 11 : | \ wordlist-map | ||
| 12 : | \ 1 cells: field enum-method | ||
| 13 : | \ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method | ||
| 14 : | |||
| 15 : | : nalign ( addr1 n -- addr2 ) | ||
| 16 : | \ addr2 is the aligned version of addr1 wrt the alignment size n | ||
| 17 : | 1- tuck + swap invert and ; | ||
| 18 : | |||
| 19 : | pazsan | 1.3 | : field ( offset1 align1 size align -- offset2 align2 ) |
| 20 : | anton | 1.1 | \ note: this version uses local variables |
| 21 : | pazsan | 1.3 | Header reveal -7 ( [ :dostruc ] Literal ) cfa, |
| 22 : | anton | 1.1 | >r rot r@ nalign dup , ( align1 size offset ) |
| 23 : | + swap r> nalign ; | ||
| 24 : | |||
| 25 : | : end-struct ( size align -- ) | ||
| 26 : | 2constant ; | ||
| 27 : | |||
| 28 : | 0 1 chars end-struct struct | ||
| 29 : | |||
| 30 : | pazsan | 1.3 | \ : field ( offset1 align1 size align -- offset2 align2 ) |
| 31 : | \ create-field | ||
| 32 : | \ does> ( addr1 -- addr2 ) | ||
| 33 : | \ @ + ; | ||
| 34 : | anton | 1.1 | |
| 35 : | \ I don't really like the "type:" syntax. Any other ideas? - anton | ||
| 36 : | \ Also, this seems to be somewhat general. It probably belongs to some | ||
| 37 : | \ other place | ||
| 38 : | : cells: ( n -- size align ) | ||
| 39 : | cells cell ; | ||
| 40 : | |||
| 41 : | : doubles: ( n -- size align ) | ||
| 42 : | 2* cells cell ; | ||
| 43 : | |||
| 44 : | : chars: ( n -- size align ) | ||
| 45 : | chars 1 chars ; | ||
| 46 : | |||
| 47 : | : floats: ( n -- size align ) | ||
| 48 : | floats 1 floats ; | ||
| 49 : | |||
| 50 : | \ dfoats and sfloats is not yet defined | ||
| 51 : | \ : dfloats: ( n -- size align ) | ||
| 52 : | \ dfloats 1 dfloats ; | ||
| 53 : | \ | ||
| 54 : | \ : sfloats: ( n -- size align ) | ||
| 55 : | anton | 1.2 | \ sfloats 1 sfloats ; |
| 56 : | |||
| 57 : | : struct-align ( size align -- ) | ||
| 58 : | dp @ swap nalign dp ! | ||
| 59 : | drop ; | ||
| 60 : | |||
| 61 : | : struct-allot ( size align -- addr ) | ||
| 62 : | over swap struct-align | ||
| 63 : | here swap allot ; | ||
| 64 : | |||
| 65 : | : struct-allocate ( size align -- addr ) | ||
| 66 : | drop allocate ; |
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