1 /* How much read-only Lisp storage a dumped Emacs needs.
2 Copyright (C) 1993, 2001-2015 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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
9 (at your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
19 #ifndef EMACS_PURESIZE_H
20 #define EMACS_PURESIZE_H
26 /* Define PURESIZE, the number of bytes of pure Lisp code to leave space for.
28 At one point, this was defined in config.h, meaning that changing
29 PURESIZE would make Make recompile all of Emacs. But only a few
30 files actually use PURESIZE, so we split it out to its own .h file.
32 Make sure to include this file after config.h, since that tells us
33 whether we are running X windows, which tells us how much pure
34 storage to allocate. */
36 /* First define a measure of the amount of data we have. */
38 /* A system configuration file may set this to request a certain extra
39 amount of storage. This is a lot more update-robust that defining
40 BASE_PURESIZE or even PURESIZE directly. */
41 #ifndef SYSTEM_PURESIZE_EXTRA
42 #define SYSTEM_PURESIZE_EXTRA 0
45 #ifndef SITELOAD_PURESIZE_EXTRA
46 #define SITELOAD_PURESIZE_EXTRA 0
50 #define BASE_PURESIZE (1800000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
53 /* Increase BASE_PURESIZE by a ratio depending on the machine's word size. */
54 #ifndef PURESIZE_RATIO
55 #if EMACS_INT_MAX >> 31 != 0
56 #if PTRDIFF_MAX >> 31 != 0
57 #define PURESIZE_RATIO 10 / 6 /* Don't surround with `()'. */
59 #define PURESIZE_RATIO 8 / 6 /* Don't surround with `()'. */
62 #define PURESIZE_RATIO 1
66 #ifdef ENABLE_CHECKING
67 /* ENABLE_CHECKING somehow increases the purespace used, probably because
68 it tends to cause some macro arguments to be evaluated twice. This is
69 a bug, but it's difficult to track it down. */
70 #define PURESIZE_CHECKING_RATIO 12 / 10 /* Don't surround with `()'. */
72 #define PURESIZE_CHECKING_RATIO 1
75 /* This is the actual size in bytes to allocate. */
77 #define PURESIZE (BASE_PURESIZE * PURESIZE_RATIO * PURESIZE_CHECKING_RATIO)
80 extern _Noreturn
void pure_write_error (Lisp_Object
);
82 extern EMACS_INT pure
[];
84 /* True if PTR is pure. */
88 return (uintptr_t) (ptr
) - (uintptr_t) pure
<= PURESIZE
;
91 /* Signal an error if OBJ is pure. PTR is OBJ untagged. */
93 CHECK_IMPURE (Lisp_Object obj
, void *ptr
)
96 pure_write_error (obj
);
101 #endif /* EMACS_PURESIZE_H */