Annotation of gforth/struct.fs, revision 1.2
1.2 ! anton 1: \ $Id: struct.fs,v 1.1.1.1 1994/02/11 16:30:48 anton 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:
19: : create-field ( offset1 align1 size align -- offset2 align2 )
20: \ note: this version uses local variables
21: create
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:
30: : field ( offset1 align1 size align -- offset2 align2 )
31: create-field
32: does> ( addr1 -- addr2 )
33: @ + ;
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:
50: \ dfoats and sfloats is not yet defined
51: \ : dfloats: ( n -- size align )
52: \ dfloats 1 dfloats ;
53: \
54: \ : sfloats: ( n -- size align )
1.2 ! anton 55: \ 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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