lastfile.c 1.83 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Mark end of data space to dump as pure, for GNU Emacs.
Paul Eggert's avatar
Paul Eggert committed
2
   Copyright (C) 1985, 2001-2019 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5

This file is part of GNU Emacs.

6
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
7
it under the terms of the GNU General Public License as published by
8 9
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

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/>.  */
Jim Blandy's avatar
Jim Blandy committed
18 19 20 21 22 23 24 25


/* How this works:

 Fdump_emacs dumps everything up to my_edata as text space (pure).

 The files of Emacs are written so as to have no initialized
 data that can ever need to be altered except at the first startup.
Paul Eggert's avatar
Paul Eggert committed
26
 This is so that those words can be dumped as shareable text.
Jim Blandy's avatar
Jim Blandy committed
27 28 29 30 31 32 33 34 35 36

 It is not possible to exercise such control over library files.
 So it is necessary to refrain from making their data areas shared.
 Therefore, this file is loaded following all the files of Emacs
 but before library files.
 As a result, the symbol my_edata indicates the point
 in data space between data coming from Emacs and data
 coming from libraries.
*/

37 38
#include <config.h>

39
#include "lisp.h"
Paul Eggert's avatar
Paul Eggert committed
40

41 42
#if ((!defined SYSTEM_MALLOC && !defined HYBRID_MALLOC) \
     || 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 49 50
/* Help unexec locate the end of the .bss area used by Emacs (which
   isn't always a separate section in NT executables).  */
char my_endbss[1];
51

52 53
static char _my_endbss[1];
char * my_endbss_static = _my_endbss;
54 55

#endif