/* Functions for memory limit warnings.
- Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
- 2008, 2009, 2010 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
-#endif
-
#include "mem-limits.h"
-#ifdef HAVE_GETRLIMIT
-#include <sys/resource.h>
-#endif
-
/*
Level number of warnings already issued.
0 -- no warnings issued.
3 -- 95% warning issued; keep warning frequently.
*/
enum warnlevel { not_warned, warned_75, warned_85, warned_95 };
-
static enum warnlevel warnlevel;
+typedef void *POINTER;
+
/* 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;
/* 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 */
+#ifdef HAVE_GETRLIMIT
+
+# ifndef RLIMIT_AS
+# define RLIMIT_AS RLIMIT_DATA
+# endif
-#if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS)
static void
-get_lim_data ()
+get_lim_data (void)
{
+ /* 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;
-
- getrlimit (RLIMIT_AS, &rlimit);
- if (rlimit.rlim_cur == RLIM_INFINITY)
- lim_data = -1;
- else
- lim_data = rlimit.rlim_cur;
+ lim_data
+ = (getrlimit (RLIMIT_AS, &rlimit) == 0 && rlimit.rlim_cur <= SIZE_MAX
+ ? rlimit.rlim_cur
+ : SIZE_MAX);
}
-#else /* not HAVE_GETRLIMIT */
+#elif defined WINDOWSNT
-#ifdef USG
+#include "w32heap.h"
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;
-}
-
-#else /* not USG */
-#ifdef WINDOWSNT
-
-static void
-get_lim_data ()
-{
- 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 POINTER (*real_morecore) (ptrdiff_t);
#endif
- extern POINTER (*__morecore) ();
+ extern POINTER (*__morecore) (ptrdiff_t);
register POINTER cp;
- unsigned long five_percent;
- unsigned long data_size;
+ size_t five_percent;
+ size_t data_size;
enum warnlevel new_warnlevel;
if (lim_data == 0)
(*warn_function) ("Warning: memory in use exceeds lisp pointer size");
}
\f
+#if !defined (CANNOT_DUMP) || !defined (SYSTEM_MALLOC)
+/* Some systems that cannot dump also cannot implement these. */
+
+/*
+ * Return the address of the start of the data segment prior to
+ * doing an unexec. After unexec the return value is undefined.
+ * See crt0.c for further information and definition of data_start.
+ *
+ * Apparently, on BSD systems this is etext at startup. On
+ * USG systems (swapping) this is highly mmu dependent and
+ * is also dependent on whether or not the program is running
+ * with shared text. Generally there is a (possibly large)
+ * gap between end of text and start of data with shared text.
+ *
+ */
+
+char *
+start_of_data (void)
+{
+#ifdef BSD_SYSTEM
+ extern char etext;
+ return (POINTER)(&etext);
+#elif defined DATA_START
+ return ((POINTER) DATA_START);
+#elif defined ORDINARY_LINK
+ /*
+ * This is a hack. Since we're not linking crt0.c or pre_crt0.c,
+ * data_start isn't defined. We take the address of environ, which
+ * is known to live at or near the start of the system crt0.c, and
+ * we don't sweat the handful of bytes that might lose.
+ */
+ return ((POINTER) &environ);
+#else
+ extern int data_start;
+ return ((POINTER) &data_start);
+#endif
+}
+#endif /* (not CANNOT_DUMP or not SYSTEM_MALLOC) */
+\f
/* Enable memory usage warnings.
START says where the end of pure storage is.
WARNFUN specifies the function to call to issue a warning. */
void
-memory_warnings (start, warnfun)
- POINTER start;
- void (*warnfun) ();
+memory_warnings (POINTER 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;
/* Force data limit to be recalculated on each run. */
lim_data = 0;
}
-
-/* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
- (do not change this comment) */