/* Functions for memory limit warnings.
- Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
- 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ Copyright (C) 1990, 1992, 2001-2013 Free Software Foundation, Inc.
This file is part of GNU Emacs.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef emacs
#include <config.h>
-#include <setjmp.h>
+#include <unistd.h> /* for 'environ', on AIX */
#include "lisp.h"
-#endif
-#ifndef emacs
-#include <stddef.h>
-typedef size_t SIZE;
-typedef void *POINTER;
-#define EXCEEDS_LISP_PTR(x) 0
+#ifdef MSDOS
+#include <dpmi.h>
+extern int etext;
#endif
-#include "mem-limits.h"
+/* Some systems need this before <sys/resource.h>. */
+#include <sys/types.h>
-#ifdef HAVE_GETRLIMIT
-#include <sys/resource.h>
+#ifdef HAVE_SYS_RESOURCE_H
+# include <sys/time.h>
+# include <sys/resource.h>
+#else
+# if HAVE_SYS_VLIMIT_H
+# include <sys/vlimit.h> /* Obsolete, says glibc */
+# endif
+#endif
+
+/* Start of data. It is OK if this is approximate; it's used only as
+ a heuristic. */
+#ifdef DATA_START
+# define data_start ((char *) DATA_START)
+#else
+extern char data_start[];
+# ifndef HAVE_DATA_START
+/* Initialize to nonzero, so that it's put into data and not bss.
+ Link this file's object code first, so that this symbol is near the
+ start of data. */
+char data_start[1] = { 1 };
+# endif
#endif
/*
3 -- 95% warning issued; keep warning frequently.
*/
enum warnlevel { not_warned, warned_75, warned_85, warned_95 };
-
static enum warnlevel warnlevel;
/* Function to call to issue a warning;
0 means don't issue them. */
-static void (*warn_function) ();
+static void (*warn_function) (const char *);
-/* Start of data space; can be changed by calling malloc_init. */
-static POINTER data_space_start;
+/* Start of data space; can be changed by calling memory_warnings. */
+static char *data_space_start;
/* Number of bytes of writable memory we can expect to be able to get. */
-static unsigned long lim_data;
+static size_t lim_data;
\f
-
-#ifdef NO_LIM_DATA
-static void
-get_lim_data ()
-{
- lim_data = -1;
-}
-#else /* not NO_LIM_DATA */
-
-#if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS)
-static void
-get_lim_data ()
+/* Return true if PTR cannot be represented as an Emacs Lisp object. */
+static bool
+exceeds_lisp_ptr (void *ptr)
{
- struct rlimit rlimit;
-
- getrlimit (RLIMIT_AS, &rlimit);
- if (rlimit.rlim_cur == RLIM_INFINITY)
- lim_data = -1;
- else
- lim_data = rlimit.rlim_cur;
+ return (! USE_LSB_TAG
+ && VAL_MAX < UINTPTR_MAX
+ && ((uintptr_t) ptr & ~DATA_SEG_BITS) >> VALBITS != 0);
}
-#else /* not HAVE_GETRLIMIT */
+#ifdef HAVE_GETRLIMIT
-#ifdef USG
+# ifndef RLIMIT_AS
+# define RLIMIT_AS RLIMIT_DATA
+# endif
static void
-get_lim_data ()
+get_lim_data (void)
{
- extern long ulimit ();
-
- lim_data = -1;
-
- /* Use the ulimit call, if we seem to have it. */
-#if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX)
- lim_data = ulimit (3, 0);
-#endif
-
- /* If that didn't work, just use the macro's value. */
-#ifdef ULIMIT_BREAK_VALUE
- if (lim_data == -1)
- lim_data = ULIMIT_BREAK_VALUE;
-#endif
-
- lim_data -= (long) data_space_start;
+ /* Set LIM_DATA to the minimum of the maximum object size and the
+ maximum address space. Don't bother to check for values like
+ RLIM_INFINITY since in practice they are not much less than SIZE_MAX. */
+ struct rlimit rlimit;
+ lim_data
+ = (getrlimit (RLIMIT_AS, &rlimit) == 0 && rlimit.rlim_cur <= SIZE_MAX
+ ? rlimit.rlim_cur
+ : SIZE_MAX);
}
-#else /* not USG */
-#ifdef WINDOWSNT
+#elif defined WINDOWSNT
+
+#include "w32heap.h"
static void
-get_lim_data ()
+get_lim_data (void)
{
- extern unsigned long reserved_heap_size;
+ extern size_t reserved_heap_size;
lim_data = reserved_heap_size;
}
-#else
-#if !defined (BSD4_2) && !defined (__osf__)
+#elif defined MSDOS
-#ifdef MSDOS
void
-get_lim_data ()
+get_lim_data (void)
{
_go32_dpmi_meminfo info;
unsigned long lim1, lim2;
}
unsigned long
-ret_lim_data ()
+ret_lim_data (void)
{
get_lim_data ();
return lim_data;
}
-#else /* not MSDOS */
-static void
-get_lim_data ()
-{
- lim_data = vlimit (LIM_DATA, -1);
-}
-#endif /* not MSDOS */
-
-#else /* BSD4_2 */
-
-static void
-get_lim_data ()
-{
- struct rlimit XXrlimit;
-
- getrlimit (RLIMIT_DATA, &XXrlimit);
-#ifdef RLIM_INFINITY
- lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
#else
- lim_data = XXrlimit.rlim_cur; /* soft limit */
+# error "get_lim_data not implemented on this machine"
#endif
-}
-#endif /* BSD4_2 */
-#endif /* not WINDOWSNT */
-#endif /* not USG */
-#endif /* not HAVE_GETRLIMIT */
-#endif /* not NO_LIM_DATA */
\f
/* Verify amount of memory available, complaining if we're near the end. */
static void
-check_memory_limits ()
+check_memory_limits (void)
{
#ifdef REL_ALLOC
- extern POINTER (*real_morecore) ();
+ extern void *(*real_morecore) (ptrdiff_t);
+#else
+ void *(*real_morecore) (ptrdiff_t) = 0;
#endif
- extern POINTER (*__morecore) ();
+ extern void *(*__morecore) (ptrdiff_t);
- register POINTER cp;
- unsigned long five_percent;
- unsigned long data_size;
+ char *cp;
+ size_t five_percent;
+ size_t data_size;
enum warnlevel new_warnlevel;
if (lim_data == 0)
five_percent = lim_data / 20;
/* Find current end of memory and issue warning if getting near max */
-#ifdef REL_ALLOC
- if (real_morecore)
- cp = (char *) (*real_morecore) (0);
- else
-#endif
- cp = (char *) (*__morecore) (0);
- data_size = (char *) cp - (char *) data_space_start;
+ cp = (real_morecore ? real_morecore : __morecore) (0);
+ data_size = cp - data_space_start;
if (!warn_function)
return;
warnlevel = warned_85;
}
- if (EXCEEDS_LISP_PTR (cp))
+ if (exceeds_lisp_ptr (cp))
(*warn_function) ("Warning: memory in use exceeds lisp pointer size");
}
\f
WARNFUN specifies the function to call to issue a warning. */
void
-memory_warnings (start, warnfun)
- POINTER start;
- void (*warnfun) ();
+memory_warnings (void *start, void (*warnfun) (const char *))
{
- extern void (* __after_morecore_hook) (); /* From gmalloc.c */
+ extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
- if (start)
- data_space_start = start;
- else
- data_space_start = start_of_data ();
+ data_space_start = start ? start : data_start;
warn_function = warnfun;
__after_morecore_hook = check_memory_limits;
/* Force data limit to be recalculated on each run. */
lim_data = 0;
}
-
-/* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
- (do not change this comment) */
HCoop / bpt / emacs.git / blobdiff