src/puresize.h

   1 /* How much read-only Lisp storage a dumped Emacs needs.
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   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 2, or (at your option)
   9 any later version.
  10
  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.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Define PURESIZE, the number of bytes of pure Lisp code to leave space for.
  22
  23    At one point, this was defined in config.h, meaning that changing
  24    PURESIZE would make Make recompile all of Emacs.  But only a few
  25    files actually use PURESIZE, so we split it out to its own .h file.
  26
  27    Make sure to include this file after config.h, since that tells us
  28    whether we are running X windows, which tells us how much pure
  29    storage to allocate.  */
  30
  31 /* First define a measure of the amount of data we have.  */
  32
  33 /* A system configuration file may set this to request a certain extra
  34    amount of storage.  This is a lot more update-robust that defining
  35    BASE_PURESIZE or even PURESIZE directly.  */
  36 #ifndef SYSTEM_PURESIZE_EXTRA
  37 #define SYSTEM_PURESIZE_EXTRA 0
  38 #endif
  39
  40 #ifndef SITELOAD_PURESIZE_EXTRA
  41 #define SITELOAD_PURESIZE_EXTRA 0
  42 #endif
  43
  44 #ifndef BASE_PURESIZE
  45 #define BASE_PURESIZE (400000 + SYSTEM_PURESIZE_EXTRA + SITELOAD_PURESIZE_EXTRA)
  46 #endif
  47
  48 /* Increase BASE_PURESIZE by a ratio depending on the machine's word size.  */
  49 #ifndef PURESIZE_RATIO
  50 #if VALBITS + GCTYPEBITS + 1 > 32
  51 #define PURESIZE_RATIO 8/5      /* Don't surround with `()'. */
  52 #else
  53 #define PURESIZE_RATIO 1
  54 #endif
  55 #endif
  56
  57 /* This is the actual size in bytes to allocate.  */
  58 #ifndef PURESIZE
  59 #define PURESIZE  (BASE_PURESIZE * PURESIZE_RATIO)
  60 #endif
  61
  62 /* Signal an error if OBJ is pure.  */
  63 #define CHECK_IMPURE(obj) \
  64   { if (PURE_P (obj))     \
  65       pure_write_error (); }
  66 \f
  67 /* Define PURE_P.  */
  68
  69 #ifdef VIRT_ADDR_VARIES
  70 /* For machines like APOLLO where text and data can go anywhere
  71    in virtual memory.  */
  72
  73 extern EMACS_INT pure[];
  74
  75 #define PURE_P(obj) \
  76  ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) \
  77   && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure)
  78
  79 #else /* not VIRT_ADDR_VARIES */
  80 #ifdef PNTR_COMPARISON_TYPE
  81 /* When PNTR_COMPARISON_TYPE is not the default (unsigned int).  */
  82
  83 extern char my_edata[];
  84
  85 #define PURE_P(obj) \
  86   ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) my_edata)
  87
  88 #else /* not VIRT_ADDRESS_VARIES, not PNTR_COMPARISON_TYPE */
  89
  90 extern char my_edata[];
  91
  92 #define PURE_P(obj) \
  93   (XPNTR (obj) < (unsigned int) my_edata)
  94
  95 #endif /* PNTR_COMPARISON_TYPE */
  96 #endif /* VIRT_ADDRESS_VARIES */
  97