File:
[gforth] /
gforth /
struct.fs
Revision
1.15:
download - view:
text,
annotated -
select for diffs
Tue Mar 23 20:24:20 1999 UTC (25 years, 1 month ago) by
crook
Branches:
MAIN
CVS tags:
HEAD
Makefile.in
-- changes to make documentation build with moofglos.fs
rather than with mini-oof.fs (since the former contains glossary
entries and the latter does not)
assert.fs blocks.fs debug.fs environ.fs errors.fs extend.fs float.fs
glocals.fs moofglos.fs prim search.fs struct.fs stuff.fs vt100.fs
kernel/args.fs kernel/basics.fs kernel/comp.fs kernel/cond.fs
kernel/files.fs kernel/getdoers.fs kernel/int.fs kernel/io.fs
kernel/nio.fs kernel/paths.fs kernel/require.fs kernel/special.fs
kernel/tools.fs kernel/toolsext.fs kernel/vars.fs
-- many small changes to glossary entries.. I think most are done
now, so I hope to change far fewer files next time!
doc/gforth.ds
-- many, many small changes and a few large ones. Moved some sections
around, fixed typos and formatting errors, added new section on
exception handling, rearranged 'files' section.
1: \ data structures (like C structs)
2:
3: \ Copyright (C) 1995, 1997 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: : naligned ( addr1 n -- addr2 ) \ gforth
22: \g @var{addr2} is the aligned version of @var{addr1} with respect to the
23: \g alignment @var{n}.
24: 1- tuck + swap invert and ;
25:
26: ' naligned alias nalign \ old name, obsolete
27:
28: : dozerofield ( -- )
29: \ a field that makes no change
30: \ to enable accessing the offset with "['] <field> >body @" this
31: \ is not implemented with "['] noop alias"
32: last @
33: if
34: immediate
35: then
36: does> ( name execution: -- )
37: drop ;
38:
39: : field, ( align1 offset1 align size -- align2 offset2 )
40: swap rot over nalign dup , ( align1 size align offset )
41: rot + >r nalign r> ;
42:
43: : create-field ( align1 offset1 align size -- align2 offset2 )
44: create field, ;
45:
46: : field ( align1 offset1 align size "name" -- align2 offset2 ) \ gforth
47: \G @code{name} execution: @var{addr1} -- @var{addr2}.
48: 2 pick
49: if \ field offset <> 0
50: [IFDEF] (Field)
51: (Field)
52: [ELSE]
53: Header reveal dofield: cfa,
54: [THEN]
55: else
56: create dozerofield
57: then
58: field, ;
59:
60: : end-struct ( align size "name" -- ) \ gforth
61: \g @code{name} execution: @var{addr1} -- @var{addr1+offset1}@*
62: \g Create a field @var{name} with offset @var{offset1}, and the type
63: \g given by @var{size align}. @var{offset2} is the offset of the
64: \g next field, and @var{align2} is the alignment of all fields.
65: over nalign \ pad size to full alignment
66: 2constant ;
67:
68: 1 chars 0 end-struct struct ( -- align size ) \ gforth
69: \g An empty structure, used to start a structure definition.
70:
71: \ type descriptors
72: 1 aligned 1 cells 2constant cell% ( -- align size ) \ gforth
73: 1 chars 1 chars 2constant char% ( -- align size ) \ gforth
74: 1 faligned 1 floats 2constant float% ( -- align size ) \ gforth
75: 1 dfaligned 1 dfloats 2constant dfloat% ( -- align size ) \ gforth
76: 1 sfaligned 1 sfloats 2constant sfloat% ( -- align size ) \ gforth
77: cell% 2* 2constant double% ( -- align size ) \ gforth
78:
79: \ memory allocation words
80: ' drop alias %alignment ( align size -- align ) \ gforth
81: \g The alignment of the structure.
82: ' nip alias %size ( align size -- size ) \ gforth
83: \g The size of the structure.
84:
85: : %align ( align size -- ) \ gforth
86: \G Align the data space pointer to the alignment @var{align}.
87: drop here swap nalign here - allot ;
88:
89: : %allot ( align size -- addr ) \ gforth
90: \g Allot @var{size} address units of data space with alignment
91: \g @var{align}; the resulting block of data is found at
92: \g @var{addr}.
93: tuck %align
94: here swap allot ;
95:
96: : %allocate ( align size -- addr ior ) \ gforth
97: \g Allocate @var{size} address units with alignment @var{align},
98: \g similar to @code{allocate}.
99: nip allocate ;
100:
101: : %alloc ( size align -- addr ) \ gforth
102: \g Allocate @var{size} address units with alignment @var{align},
103: \g giving a data block at @var{addr}; @code{throw} an ior code
104: \g if not successful.
105: %allocate throw ;
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>