Annotation of gforth/struct.fs, revision 1.7
1.7 ! anton 1: \ $Id: struct.fs,v 1.6 1995/09/06 21:00:30 pazsan Exp $
1.1 anton 2:
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:
1.3 pazsan 19: : field ( offset1 align1 size align -- offset2 align2 )
1.1 anton 20: \ note: this version uses local variables
1.7 ! anton 21: Header reveal dofield: cfa,
1.1 anton 22: >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:
1.3 pazsan 30: \ : field ( offset1 align1 size align -- offset2 align2 )
31: \ create-field
32: \ does> ( addr1 -- addr2 )
33: \ @ + ;
1.1 anton 34:
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:
1.5 pazsan 50: : dfloats: ( n -- size align )
51: dfloats 1 dfloats ;
1.2 anton 52:
1.5 pazsan 53: : sfloats: ( n -- size align )
54: sfloats 1 sfloats ;
55:
1.2 anton 56: : struct-align ( size align -- )
57: dp @ swap nalign dp !
58: drop ;
59:
60: : struct-allot ( size align -- addr )
61: over swap struct-align
62: here swap allot ;
63:
1.5 pazsan 64: : struct-allocate ( size align -- addr ior )
1.2 anton 65: drop allocate ;
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>