Commit 2018939f authored by Andreas Schwab's avatar Andreas Schwab

Use __builtin_unwind_init if available

* configure.in: Check for __builtin_unwind_init.

* src/alloc.c (mark_stack): Use __builtin_unwind_init if available.
parent 96f129d5
2011-01-05 Andreas Schwab <schwab@linux-m68k.org>
* configure.in: Check for __builtin_unwind_init.
2011-01-05 Glenn Morris <rgm@gnu.org>
* configure.in (HAVE_MAKEINFO): New output variable.
......
This diff is collapsed.
......@@ -5,7 +5,7 @@ dnl in the directory containing this script.
dnl If you changed any AC_DEFINES, also run autoheader.
dnl
dnl Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2003, 2004,
dnl 2005, 2006, 2007, 2008, 2009, 2010
dnl 2005, 2006, 2007, 2008, 2009, 2010, 2011
dnl Free Software Foundation, Inc.
dnl
dnl This file is part of GNU Emacs.
......@@ -2635,6 +2635,17 @@ gai_strerror mkstemp getline getdelim mremap memmove fsync sync \
memset memcmp difftime memcpy mempcpy mblen mbrlen posix_memalign \
cfmakeraw cfsetspeed isnan copysign __executable_start)
dnl Cannot use AC_CHECK_FUNCS
AC_CACHE_CHECK([for __builtin_unwind_init],
emacs_cv_func___builtin_unwind_init,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([], [__builtin_unwind_init ();])],
emacs_cv_func___builtin_unwind_init=yes,
emacs_cv_func___builtin_unwind_init=no)])
if test $emacs_cv_func___builtin_unwind_init = yes; then
AC_DEFINE(HAVE___BUILTIN_UNWIND_INIT, 1,
[Define to 1 if you have the `__builtin_unwind_init' function.])
fi
AC_CHECK_HEADERS(sys/un.h)
AC_FUNC_MKTIME
......
2011-01-05 Andreas Schwab <schwab@linux-m68k.org>
* alloc.c (mark_stack): Use __builtin_unwind_init if available.
2011-01-04 Jan Moringen <jan.moringen@uni-bielefeld.de>
* dbusbind.c (Fdbus_register_method): Added optional parameter
......@@ -29431,7 +29435,7 @@ See ChangeLog.10 for earlier changes.
;; coding: utf-8
;; End:
Copyright (C) 2007, 2008, 2009, 2010
Copyright (C) 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GNU Emacs.
......
/* Storage allocation and gc for GNU Emacs Lisp interpreter.
Copyright (C) 1985, 1986, 1988, 1993, 1994, 1995, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GNU Emacs.
......@@ -4222,7 +4222,7 @@ Please mail the result to <emacs-devel@gnu.org>.\n\
can prove that. */
static void
test_setjmp ()
test_setjmp (void)
{
char buf[10];
register int x;
......@@ -4270,7 +4270,7 @@ test_setjmp ()
/* Abort if anything GCPRO'd doesn't survive the GC. */
static void
check_gcpros ()
check_gcpros (void)
{
struct gcpro *p;
int i;
......@@ -4286,7 +4286,7 @@ check_gcpros ()
#elif GC_MARK_STACK == GC_USE_GCPROS_CHECK_ZOMBIES
static void
dump_zombies ()
dump_zombies (void)
{
int i;
......@@ -4321,6 +4321,11 @@ dump_zombies ()
have to be true! It must be verified for each system, possibly
by taking a look at the source code of setjmp.
If __builtin_unwind_init is available (defined by GCC >= 2.8) we
can use it as a machine independent method to store all registers
to the stack. In this case the macros described in the previous
two paragraphs are not used.
Stack Layout
Architectures differ in the way their processor stack is organized.
......@@ -4359,6 +4364,13 @@ mark_stack (void)
volatile int stack_grows_down_p = (char *) &j > (char *) stack_base;
void *end;
#ifdef HAVE___BUILTIN_UNWIND_INIT
/* Force callee-saved registers and register windows onto the stack.
This is the preferred method if available, obviating the need for
machine dependent methods. */
__builtin_unwind_init ();
end = &end;
#else /* not HAVE___BUILTIN_UNWIND_INIT */
/* This trick flushes the register windows so that all the state of
the process is contained in the stack. */
/* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is
......@@ -4394,6 +4406,7 @@ mark_stack (void)
setjmp (j.j);
end = stack_grows_down_p ? (char *) &j + sizeof j : (char *) &j;
#endif /* not GC_SAVE_REGISTERS_ON_STACK */
#endif /* not HAVE___BUILTIN_UNWIND_INIT */
/* This assumes that the stack is a contiguous region in memory. If
that's not the case, something has to be done here to iterate
......
......@@ -816,6 +816,9 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Define to 1 if you want to use the X window system. */
#undef HAVE_X_WINDOWS
/* Define to 1 if you have the `__builtin_unwind_init' function. */
#undef HAVE___BUILTIN_UNWIND_INIT
/* Define to 1 if you have the `__executable_start' function. */
#undef HAVE___EXECUTABLE_START
......@@ -1053,6 +1056,9 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* Define to `int' if <sys/types.h> does not define. */
#undef pid_t
/* Define to `unsigned int' if <sys/types.h> does not define. */
#undef size_t
/* Define to any substitute for sys_siglist. */
#undef sys_siglist
......
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