1 /* Mark end of data space to dump as pure, for GNU Emacs.
2 Copyright (C) 1985, 2001-2023 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or (at
9 your option) any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
18
19
20 /* How this works:
21
22 Fdump_emacs dumps everything up to my_edata as text space (pure).
23
24 The files of Emacs are written so as to have no initialized
25 data that can ever need to be altered except at the first startup.
26 This is so that those words can be dumped as shareable text.
27
28 It is not possible to exercise such control over library files.
29 So it is necessary to refrain from making their data areas shared.
30 Therefore, this file is loaded following all the files of Emacs
31 but before library files.
32 As a result, the symbol my_edata indicates the point
33 in data space between data coming from Emacs and data
34 coming from libraries.
35 */
36
37 #include <config.h>
38
39 #include "lisp.h"
40
41 #if ((!defined SYSTEM_MALLOC && !defined HYBRID_MALLOC) \
42 || defined WINDOWSNT || defined CYGWIN || defined DARWIN_OS)
43 char my_edata[] = "End of Emacs initialized data";
44 #endif
45
46 #ifdef HAVE_UNEXEC
47
48 /* Help unexec locate the end of the .bss area used by Emacs (which
49 isn't always a separate section in NT executables). */
50 char my_endbss[1];
51
52 static char _my_endbss[1];
53 char * my_endbss_static = _my_endbss;
54
55 #endif