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0328b6de4a
* configure.ac (HAVE__SETJMP, HAVE_SIGSETJMP): New symbols. (_setjmp, _longjmp): Remove. * src/lisp.h: Include <setjmp.h> here, since we use its symbols here. All instances of '#include <setjmp.h>' removed, if the only reason for the instance was because "lisp.h" was included. (sys_jmp_buf, sys_setjmp, sys_longjmp): New symbols. Unless otherwise specified, replace all uses of jmp_buf, _setjmp, and _longjmp with the new symbols. Emacs already uses _setjmp if available, so this change affects only POSIXish hosts that have sigsetjmp but not _setjmp, such as some versions of Solaris and Unixware. (Also, POSIX-2008 marks _setjmp as obsolescent.) * src/image.c (_setjmp, _longjmp) [HAVE_PNG && !HAVE__SETJMP]: New macros. (png_load_body) [HAVE_PNG]: (PNG_LONGJMP) [HAVE_PNG && PNG_LIBPNG_VER < 10500]: (PNG_JMPBUF) [HAVE_PNG && PNG_LIBPNG_VER >= 10500]: Use _setjmp and _longjmp rather than sys_setjmp and sys_longjmp, since PNG requires jmp_buf. This is the only exception to the general rule that we now use sys_setjmp and sys_longjmp. This exception is OK since this code does not change the signal mask or longjmp out of a signal handler. Fixes: debbugs:12446
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* simulate `sbrk' with an array in .bss, for `unexec' support for Cygwin;
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complete rewrite of xemacs Cygwin `unexec' code
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Copyright (C) 2004-2012 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdio.h>
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#include "lisp.h"
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#include <unistd.h>
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#define STATIC_HEAP_SIZE (13 * 1024 * 1024)
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int debug_sheap = 0;
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#define BLOCKSIZE 4096
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char bss_sbrk_buffer[STATIC_HEAP_SIZE];
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char *bss_sbrk_ptr;
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int bss_sbrk_did_unexec;
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void *
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bss_sbrk (ptrdiff_t request_size)
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{
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if (!bss_sbrk_ptr)
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{
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bss_sbrk_ptr = bss_sbrk_buffer;
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#ifdef CYGWIN
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sbrk (BLOCKSIZE); /* force space for fork to work */
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#endif
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}
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if (!(int) request_size)
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{
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return (bss_sbrk_ptr);
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}
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else if (bss_sbrk_ptr + (int) request_size < bss_sbrk_buffer)
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{
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printf
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("attempt to free too much: avail %d used %d failed request %d\n",
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STATIC_HEAP_SIZE, bss_sbrk_ptr - bss_sbrk_buffer,
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(int) request_size);
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exit (-1);
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return 0;
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}
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else if (bss_sbrk_ptr + (int) request_size >
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bss_sbrk_buffer + STATIC_HEAP_SIZE)
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{
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printf ("static heap exhausted: avail %d used %d failed request %d\n",
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STATIC_HEAP_SIZE,
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bss_sbrk_ptr - bss_sbrk_buffer, (int) request_size);
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exit (-1);
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return 0;
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}
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else if ((int) request_size < 0)
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{
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bss_sbrk_ptr += (int) request_size;
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if (debug_sheap)
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printf ("freed size %d\n", request_size);
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return bss_sbrk_ptr;
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}
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else
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{
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char *ret = bss_sbrk_ptr;
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if (debug_sheap)
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printf ("allocated 0x%08x size %d\n", ret, request_size);
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bss_sbrk_ptr += (int) request_size;
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return ret;
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}
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}
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void
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report_sheap_usage (int die_if_pure_storage_exceeded)
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{
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char buf[200];
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sprintf (buf, "Static heap usage: %d of %d bytes",
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bss_sbrk_ptr - bss_sbrk_buffer, STATIC_HEAP_SIZE);
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message ("%s", buf);
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}
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