src/puresize.h

   1 /* How much read-only Lisp storage a dumped Emacs needs.
   2    Copyright (C) 1993, 2001, 2002, 2003, 2004, 2005,
   3                  2006, 2007  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* Define PURESIZE, the number of bytes of pure Lisp code to leave space for.
  23
  24    At one point, this was defined in config.h, meaning that changing
  25    PURESIZE would make Make recompile all of Emacs.  But only a few
  26    files actually use PURESIZE, so we split it out to its own .h file.
  27
  28    Make sure to include this file after config.h, since that tells us
  29    whether we are running X windows, which tells us how much pure
  30    storage to allocate.  */
  31
  32 /* First define a measure of the amount of data we have.  */
  33
  34 /* A system configuration file may set this to request a certain extra
  35    amount of storage.  This is a lot more update-robust that defining
  36    BASE_PURESIZE or even PURESIZE directly.  */
  37 #ifndef SYSTEM_PURESIZE_EXTRA
  38 #define SYSTEM_PURESIZE_EXTRA 0
  39 #endif
  40
  41 #ifndef SITELOAD_PURESIZE_EXTRA
  42 #define SITELOAD_PURESIZE_EXTRA 0
  43 #endif
  44
  45 #ifndef BASE_PURESIZE
  46 #define BASE_PURESIZE (1120000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
  47 #endif
  48
  49 /* Increase BASE_PURESIZE by a ratio depending on the machine's word size.  */
  50 #ifndef PURESIZE_RATIO
  51 #if BITS_PER_EMACS_INT > 32
  52 #define PURESIZE_RATIO 10/6     /* Don't surround with `()'. */
  53 #else
  54 #define PURESIZE_RATIO 1
  55 #endif
  56 #endif
  57
  58 /* This is the actual size in bytes to allocate.  */
  59 #ifndef PURESIZE
  60 #define PURESIZE  (BASE_PURESIZE * PURESIZE_RATIO)
  61 #endif
  62
  63 /* Signal an error if OBJ is pure.  */
  64 #define CHECK_IMPURE(obj) \
  65   { if (PURE_P (obj))     \
  66       pure_write_error (); }
  67
  68 extern void pure_write_error P_ ((void)) NO_RETURN;
  69 \f
  70 /* Define PURE_P.  */
  71
  72 #if defined(VIRT_ADDR_VARIES) || defined(CYGWIN)
  73 /* For machines like APOLLO where text and data can go anywhere
  74    in virtual memory.  */
  75
  76 extern EMACS_INT pure[];
  77
  78 #define PURE_P(obj) \
  79  ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) \
  80   && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure)
  81
  82 #else /* not VIRT_ADDR_VARIES */
  83 #ifdef PNTR_COMPARISON_TYPE
  84 /* When PNTR_COMPARISON_TYPE is not the default (unsigned int).  */
  85
  86 extern char my_edata[];
  87
  88 #define PURE_P(obj) \
  89   ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) my_edata)
  90
  91 #else /* not VIRT_ADDRESS_VARIES, not PNTR_COMPARISON_TYPE */
  92
  93 extern char my_edata[];
  94
  95 #define PURE_P(obj) \
  96   (XPNTR (obj) < (unsigned int) my_edata)
  97
  98 #endif /* PNTR_COMPARISON_TYPE */
  99 #endif /* VIRT_ADDRESS_VARIES */
 100
 101 /* arch-tag: fd9b0a91-a70e-4729-a75a-6bb4ca1ce14f
 102    (do not change this comment) */