src/puresize.h

   1 /* How much read-only Lisp storage a dumped Emacs needs.
   2    Copyright (C) 1991 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* # bytes of pure Lisp code to leave space for.
  21
  22    At one point, this was defined in config.h, meaning that changing
  23    PURESIZE would make Make recompile all of Emacs.  But only a few
  24    files actually use PURESIZE, so we split it out to its own .h file.
  25
  26    Make sure to include this file after config.h, since that tells us
  27    whether we are running X windows, which tells us how much pure
  28    storage to allocate.  */
  29
  30 #ifndef PURESIZE
  31 #ifdef HAVE_X_WINDOWS
  32 #define PURESIZE 200000
  33 #else
  34 #define PURESIZE 196000
  35 #endif
  36 #endif
  37
  38 #ifdef VIRT_ADDR_VARIES
  39
  40 /* For machines like APOLLO where text and data can go anywhere
  41    in virtual memory.  */
  42 #define CHECK_IMPURE(obj) \
  43   { extern int pure[]; \
  44     if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) ((char *) pure + PURESIZE) \
  45         && (PNTR_COMPARISON_TYPE) XPNTR (obj) >= (PNTR_COMPARISON_TYPE) pure) \
  46       pure_write_error (); }
  47
  48 #else /* not VIRT_ADDR_VARIES */
  49 #ifdef PNTR_COMPARISON_TYPE
  50
  51 /* when PNTR_COMPARISON_TYPE is not the default (unsigned int) */
  52 #define CHECK_IMPURE(obj) \
  53   { extern int my_edata; \
  54     if ((PNTR_COMPARISON_TYPE) XPNTR (obj) < (PNTR_COMPARISON_TYPE) &my_edata) \
  55       pure_write_error (); }
  56
  57 #else /* not VIRT_ADDRESS_VARIES, not PNTR_COMPARISON_TYPE */
  58
  59 #define CHECK_IMPURE(obj) \
  60   { extern int my_edata; \
  61     if (XPNTR (obj) < (unsigned int) &my_edata) \
  62       pure_write_error (); }
  63
  64 #endif /* PNTR_COMPARISON_TYPE */
  65 #endif /* VIRT_ADDRESS_VARIES */
  66