310f5bd429
* lisp.h (VALBITS): Move definition up, so that USE_LSB_TAG can use it. (USE_LSB_TAG): Do not define if UINTPTR_MAX >> VALBITS == 0. It's useless in that case, and it can cause problems on hosts that allocate halves of EMACS_INT values separately. Reported by Dan Horák. Diagnosed by Andreas Schwab in <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10780#30>. * mem-limits.h (EXCEEDS_LISP_PTR): Define to 0 on hosts where UINTPTR_MAX >> VALBITS == 0. This is required by the above change; it avoids undefined behavior on hosts where shifting right by more than the word width has undefined behavior.
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Includes for memory limit warnings.
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Copyright (C) 1990, 1993-1996, 2001-2012 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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#ifdef MSDOS
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#include <dpmi.h>
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extern int etext;
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#endif
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/* Some systems need this before <sys/resource.h>. */
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#include <sys/types.h>
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#ifdef HAVE_SYS_RESOURCE_H
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# include <sys/time.h>
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# include <sys/resource.h>
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#else
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# if HAVE_SYS_VLIMIT_H
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# include <sys/vlimit.h> /* Obsolete, says glibc */
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# endif
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#endif
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extern char *start_of_data (void);
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#if defined USE_LSB_TAG || UINTPTR_MAX >> VALBITS == 0
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#define EXCEEDS_LISP_PTR(ptr) 0
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#elif defined DATA_SEG_BITS
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#define EXCEEDS_LISP_PTR(ptr) \
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(((uintptr_t) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
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#else
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#define EXCEEDS_LISP_PTR(ptr) ((uintptr_t) (ptr) >> VALBITS)
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#endif
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