/* Functions for memory limit warnings.
- Copyright (C) 1990, 1992, 2001-2012 Free Software Foundation, Inc.
+ Copyright (C) 1990, 1992, 2001-2014 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#include <config.h>
#include <unistd.h> /* for 'environ', on AIX */
#include "lisp.h"
-#include "mem-limits.h"
+
+#ifdef MSDOS
+#include <dpmi.h>
+extern int etext;
+#endif
+
+/* Some systems need this before <sys/resource.h>. */
+#include <sys/types.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
/*
Level number of warnings already issued.
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) (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 size_t lim_data;
\f
+#ifdef HAVE_GETRLIMIT
+
+# ifndef RLIMIT_AS
+# define RLIMIT_AS RLIMIT_DATA
+# endif
-#if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS)
static void
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 */
-
-#ifdef USG
-
-static void
-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;
-}
+#elif defined WINDOWSNT
-#else /* not USG */
-#ifdef WINDOWSNT
+#include "w32heap.h"
static void
get_lim_data (void)
lim_data = reserved_heap_size;
}
-#else
-#if !defined (BSD4_2) && !defined (CYGWIN)
+#elif defined MSDOS
-#ifdef MSDOS
void
get_lim_data (void)
{
get_lim_data ();
return lim_data;
}
-#else /* not MSDOS */
-static void
-get_lim_data (void)
-{
- lim_data = vlimit (LIM_DATA, -1);
-}
-#endif /* not MSDOS */
-
-#else /* BSD4_2 || CYGWIN */
-
-static void
-get_lim_data (void)
-{
- 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 */
\f
/* Verify amount of memory available, complaining if we're near the end. */
check_memory_limits (void)
{
#ifdef REL_ALLOC
- extern POINTER (*real_morecore) (ptrdiff_t);
+ extern void *(*real_morecore) (ptrdiff_t);
+#else
+ void *(*real_morecore) (ptrdiff_t) = 0;
#endif
- extern POINTER (*__morecore) (ptrdiff_t);
+ extern void *(*__morecore) (ptrdiff_t);
- register POINTER cp;
+ char *cp;
size_t five_percent;
size_t data_size;
enum warnlevel new_warnlevel;
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;
else if (warnlevel > warned_85 && data_size < five_percent * 18)
warnlevel = warned_85;
}
-
- if (EXCEEDS_LISP_PTR (cp))
- (*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 (POINTER start, void (*warnfun) (const char *))
+memory_warnings (void *start, void (*warnfun) (const char *))
{
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;
HCoop / bpt / emacs.git / blobdiff