src/sheap.h

   1 /* Static heap allocation for GNU Emacs.
   2
   3 Copyright 2016-2017 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 of the License, or
  10 (at your option) 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.  If not, see <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stddef.h>
  21 #include "lisp.h"
  22
  23 /* Size of the static heap.  Guess a value that is probably too large,
  24    by up to a factor of four or so.  Typically the unused part is not
  25    paged in and so does not cost much.  */
  26 enum { STATIC_HEAP_SIZE = sizeof (Lisp_Object) << 22 };
  27
  28 extern char bss_sbrk_buffer[STATIC_HEAP_SIZE];
  29 extern char *max_bss_sbrk_ptr;
  30 extern bool bss_sbrk_did_unexec;
  31 extern void *bss_sbrk (ptrdiff_t);