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85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
/* How much read-only Lisp storage a dumped Emacs needs.
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Copyright (C) 1993, 2001-2015 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
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/* Define PURESIZE, the number of bytes of pure Lisp code to leave space for.
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At one point, this was defined in config.h, meaning that changing
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PURESIZE would make Make recompile all of Emacs. But only a few
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files actually use PURESIZE, so we split it out to its own .h file.
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Make sure to include this file after config.h, since that tells us
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whether we are running X windows, which tells us how much pure
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storage to allocate. */
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/* First define a measure of the amount of data we have. */
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/* A system configuration file may set this to request a certain extra
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amount of storage. This is a lot more update-robust that defining
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BASE_PURESIZE or even PURESIZE directly. */
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#ifndef SYSTEM_PURESIZE_EXTRA
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#define SYSTEM_PURESIZE_EXTRA 0
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#endif
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#ifndef SITELOAD_PURESIZE_EXTRA
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#define SITELOAD_PURESIZE_EXTRA 0
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#endif
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#ifndef BASE_PURESIZE
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#define BASE_PURESIZE (1800000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
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#endif
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/* Increase BASE_PURESIZE by a ratio depending on the machine's word size. */
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#ifndef PURESIZE_RATIO
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#if EMACS_INT_MAX >> 31 != 0
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#if PTRDIFF_MAX >> 31 != 0
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#define PURESIZE_RATIO 10 / 6 /* Don't surround with `()'. */
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#else
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#define PURESIZE_RATIO 8 / 6 /* Don't surround with `()'. */
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#endif
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#else
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#define PURESIZE_RATIO 1
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#endif
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#endif
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#ifdef ENABLE_CHECKING
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/* ENABLE_CHECKING somehow increases the purespace used, probably because
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it tends to cause some macro arguments to be evaluated twice. This is
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a bug, but it's difficult to track it down. */
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#define PURESIZE_CHECKING_RATIO 12 / 10 /* Don't surround with `()'. */
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#else
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#define PURESIZE_CHECKING_RATIO 1
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#endif
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/* This is the actual size in bytes to allocate. */
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#ifndef PURESIZE
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#define PURESIZE (BASE_PURESIZE * PURESIZE_RATIO * PURESIZE_CHECKING_RATIO)
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#endif
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/* Signal an error if OBJ is pure. */
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#define CHECK_IMPURE(obj) \
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{ if (PURE_P (obj)) \
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pure_write_error (obj); }
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extern _Noreturn void pure_write_error (Lisp_Object);
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/* Define PURE_P. */
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extern EMACS_INT pure[];
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#define PURE_P(obj) \
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((uintptr_t) XPNTR (obj) - (uintptr_t) pure <= PURESIZE)
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