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/* simulate `sbrk' with an array in .bss, for `unexec' support for Cygwin;
complete rewrite of xemacs Cygwin `unexec' code
Copyright (C) 2004-2013 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/>. */
#include <config.h>
#include <stdio.h>
#include "lisp.h"
#include <unistd.h>
#define STATIC_HEAP_SIZE (13 * 1024 * 1024)
int debug_sheap = 0;
#define BLOCKSIZE 4096
char bss_sbrk_buffer[STATIC_HEAP_SIZE];
char *bss_sbrk_ptr;
int bss_sbrk_did_unexec;
void *
bss_sbrk (ptrdiff_t request_size)
{
if (!bss_sbrk_ptr)
{
bss_sbrk_ptr = bss_sbrk_buffer;
#ifdef CYGWIN
sbrk (BLOCKSIZE); /* force space for fork to work */
#endif
}
if (!(int) request_size)
{
return (bss_sbrk_ptr);
}
else if (bss_sbrk_ptr + (int) request_size < bss_sbrk_buffer)
{
printf
("attempt to free too much: avail %d used %d failed request %d\n",
STATIC_HEAP_SIZE, bss_sbrk_ptr - bss_sbrk_buffer,
(int) request_size);
exit (-1);
return 0;
}
else if (bss_sbrk_ptr + (int) request_size >
bss_sbrk_buffer + STATIC_HEAP_SIZE)
{
printf ("static heap exhausted: avail %d used %d failed request %d\n",
STATIC_HEAP_SIZE,
bss_sbrk_ptr - bss_sbrk_buffer, (int) request_size);
exit (-1);
return 0;
}
else if ((int) request_size < 0)
{
bss_sbrk_ptr += (int) request_size;
if (debug_sheap)
printf ("freed size %d\n", request_size);
return bss_sbrk_ptr;
}
else
{
char *ret = bss_sbrk_ptr;
if (debug_sheap)
printf ("allocated 0x%08x size %d\n", ret, request_size);
bss_sbrk_ptr += (int) request_size;
return ret;
}
}
void
report_sheap_usage (int die_if_pure_storage_exceeded)
{
char buf[200];
sprintf (buf, "Static heap usage: %d of %d bytes",
bss_sbrk_ptr - bss_sbrk_buffer, STATIC_HEAP_SIZE);
message ("%s", buf);
}
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