mirror of
git://git.sv.gnu.org/emacs.git
synced 2026-03-09 08:21:30 -07:00
6a0bf43d7c
does not work on some platforms. Problem reported by Andreas Schwab in <http://lists.gnu.org/archive/html/emacs-devel/2011-11/msg00081.html>. * puresize.h (pure, PURE_P): Always behave as if VIRT_ADDR_VARIES is set, removing the need for VIRT_ADDRESS_VARIES. (PURE_P): Use a more-efficient implementation that needs just one comparison, not two: on x86-64 with GCC 4.6.2, this cut down the number of instructions from 6 (xorl, cmpq, jge, xorl, cmpq, setge) to 4 (xorl, subq, cmpq, setbe). * alloc.c (pure): Always extern now, since that's the VIRT_ADDR_VARIES behavior. (PURE_POINTER_P): Use a single comparison, not two, for consistency with the new puresize.h. * lisp.h (PNTR_COMPARISON_TYPE): Remove; no longer needed. * m/ibms390.h, m/intel386.h, m/template.h, s/cygwin.h, s/hpux10-20.h: Remove VIRT_ADDR_VARIES no longer needed.
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/* How much read-only Lisp storage a dumped Emacs needs.
|
||
Copyright (C) 1993, 2001-2011 Free Software Foundation, Inc.
|
||
|
||
This file is part of GNU Emacs.
|
||
|
||
GNU Emacs is free software: you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation, either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
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
|
||
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
/* Define PURESIZE, the number of bytes of pure Lisp code to leave space for.
|
||
|
||
At one point, this was defined in config.h, meaning that changing
|
||
PURESIZE would make Make recompile all of Emacs. But only a few
|
||
files actually use PURESIZE, so we split it out to its own .h file.
|
||
|
||
Make sure to include this file after config.h, since that tells us
|
||
whether we are running X windows, which tells us how much pure
|
||
storage to allocate. */
|
||
|
||
/* First define a measure of the amount of data we have. */
|
||
|
||
/* A system configuration file may set this to request a certain extra
|
||
amount of storage. This is a lot more update-robust that defining
|
||
BASE_PURESIZE or even PURESIZE directly. */
|
||
#ifndef SYSTEM_PURESIZE_EXTRA
|
||
#define SYSTEM_PURESIZE_EXTRA 0
|
||
#endif
|
||
|
||
#ifndef SITELOAD_PURESIZE_EXTRA
|
||
#define SITELOAD_PURESIZE_EXTRA 0
|
||
#endif
|
||
|
||
#ifndef BASE_PURESIZE
|
||
#define BASE_PURESIZE (1620000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
|
||
#endif
|
||
|
||
/* Increase BASE_PURESIZE by a ratio depending on the machine's word size. */
|
||
#ifndef PURESIZE_RATIO
|
||
#if BITS_PER_EMACS_INT > 32
|
||
#define PURESIZE_RATIO 10/6 /* Don't surround with `()'. */
|
||
#else
|
||
#define PURESIZE_RATIO 1
|
||
#endif
|
||
#endif
|
||
|
||
#ifdef ENABLE_CHECKING
|
||
/* ENABLE_CHECKING somehow increases the purespace used, probably because
|
||
it tends to cause some macro arguments to be evaluated twice. This is
|
||
a bug, but it's difficult to track it down. */
|
||
#define PURESIZE_CHECKING_RATIO 12/10 /* Don't surround with `()'. */
|
||
#else
|
||
#define PURESIZE_CHECKING_RATIO 1
|
||
#endif
|
||
|
||
/* This is the actual size in bytes to allocate. */
|
||
#ifndef PURESIZE
|
||
#define PURESIZE (BASE_PURESIZE * PURESIZE_RATIO * PURESIZE_CHECKING_RATIO)
|
||
#endif
|
||
|
||
/* Signal an error if OBJ is pure. */
|
||
#define CHECK_IMPURE(obj) \
|
||
{ if (PURE_P (obj)) \
|
||
pure_write_error (); }
|
||
|
||
extern void pure_write_error (void) NO_RETURN;
|
||
|
||
/* Define PURE_P. */
|
||
|
||
extern EMACS_INT pure[];
|
||
|
||
#define PURE_P(obj) \
|
||
((uintptr_t) XPNTR (obj) - (uintptr_t) pure <= PURESIZE)
|