/* simulate `sbrk' with an array in .bss, for `unexec' support for Cygwin;
complete rewrite of xemacs Cygwin `unexec' code
- Copyright (C) 2004-2015 Free Software Foundation, Inc.
+ Copyright (C) 2004-2016 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.
+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
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
-#include <stdio.h>
-#include "lisp.h"
+#include "sheap.h"
+#include <stdio.h>
+#include "lisp.h"
#include <unistd.h>
+#include <stdlib.h> /* for exit */
-#ifdef __x86_64__
-#ifdef ENABLE_CHECKING
-#define STATIC_HEAP_SIZE (28 * 1024 * 1024)
-#else
-#define STATIC_HEAP_SIZE (19 * 1024 * 1024)
-#endif
-#else /* x86 */
-#ifdef ENABLE_CHECKING
-#define STATIC_HEAP_SIZE (18 * 1024 * 1024)
-#else
-#define STATIC_HEAP_SIZE (13 * 1024 * 1024)
-#endif
-#endif /* x86 */
-
-int debug_sheap = 0;
-
-#define BLOCKSIZE 4096
+static int debug_sheap;
char bss_sbrk_buffer[STATIC_HEAP_SIZE];
-/* The following is needed in gmalloc.c */
-void *bss_sbrk_buffer_end = bss_sbrk_buffer + STATIC_HEAP_SIZE;
-char *bss_sbrk_ptr;
char *max_bss_sbrk_ptr;
-int bss_sbrk_did_unexec;
+bool bss_sbrk_did_unexec;
void *
bss_sbrk (ptrdiff_t request_size)
{
+ static char *bss_sbrk_ptr;
+
if (!bss_sbrk_ptr)
{
max_bss_sbrk_ptr = bss_sbrk_ptr = bss_sbrk_buffer;
#ifdef CYGWIN
- sbrk (BLOCKSIZE); /* force space for fork to work */
+ /* Force space for fork to work. */
+ sbrk (4096);
#endif
}
- if (!(int) request_size)
- {
- return (bss_sbrk_ptr);
- }
- else if (bss_sbrk_ptr + (int) request_size < bss_sbrk_buffer)
+ int used = bss_sbrk_ptr - bss_sbrk_buffer;
+
+ if (request_size < -used)
{
- 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);
+ printf (("attempt to free too much: "
+ "avail %d used %d failed request %"pD"d\n"),
+ STATIC_HEAP_SIZE, used, request_size);
exit (-1);
return 0;
}
- else if (bss_sbrk_ptr + (int) request_size >
- bss_sbrk_buffer + STATIC_HEAP_SIZE)
+ else if (STATIC_HEAP_SIZE - used < request_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);
+ printf ("static heap exhausted: avail %d used %d failed request %"pD"d\n",
+ STATIC_HEAP_SIZE, used, 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
+
+ void *ret = bss_sbrk_ptr;
+ bss_sbrk_ptr += request_size;
+ if (max_bss_sbrk_ptr < bss_sbrk_ptr)
+ max_bss_sbrk_ptr = bss_sbrk_ptr;
+ if (debug_sheap)
{
- char *ret = bss_sbrk_ptr;
- if (debug_sheap)
- printf ("allocated 0x%08x size %d\n", ret, request_size);
- bss_sbrk_ptr += (int) request_size;
- if (bss_sbrk_ptr > max_bss_sbrk_ptr)
- max_bss_sbrk_ptr = bss_sbrk_ptr;
- return ret;
+ if (request_size < 0)
+ printf ("freed size %"pD"d\n", request_size);
+ else
+ printf ("allocated %p size %"pD"d\n", ret, request_size);
}
-}
-
-void
-report_sheap_usage (int die_if_pure_storage_exceeded)
-{
- char buf[200];
- sprintf (buf, "Maximum static heap usage: %d of %d bytes",
- max_bss_sbrk_ptr - bss_sbrk_buffer, STATIC_HEAP_SIZE);
- /* Don't log messages, cause at this point, we're not allowed to create
- buffers. */
- message1_nolog (buf);
+ return ret;
}