Clean up __executable_start, monstartup when --enable-profiling.

The following changes affect the code only when profiling.
* dispnew.c (__executable_start): Rename from safe_bcopy.
Define only on platforms that need it.
* emacs.c: Include <sys/gmon.h> when profiling.
(_mcleanup): Remove decl, since <sys/gmon.h> does it now.
(__executable_start): Remove decl, since lisp.h does it now.
(safe_bcopy): Remove decl; no longer has that name.
(main): Coalesce #if into single bit of code, for simplicity.
Cast pointers to uintptr_t, since standard libraries want integers
and not pointers.
* lisp.h (__executable_start): New decl.

4 files changed, 34 insertions, 25 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index c21c21deb9a..767dfa47036 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,18 @@
+2012-05-30  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Clean up __executable_start, monstartup when --enable-profiling.
+        The following changes affect the code only when profiling.
+        * dispnew.c (__executable_start): Rename from safe_bcopy.
+        Define only on platforms that need it.
+        * emacs.c: Include <sys/gmon.h> when profiling.
+        (_mcleanup): Remove decl, since <sys/gmon.h> does it now.
+        (__executable_start): Remove decl, since lisp.h does it now.
+        (safe_bcopy): Remove decl; no longer has that name.
+        (main): Coalesce #if into single bit of code, for simplicity.
+        Cast pointers to uintptr_t, since standard libraries want integers
+        and not pointers.
+        * lisp.h (__executable_start): New decl.
+
 2012-05-30  Jim Meyering  <meyering@redhat.com>
 
         * callproc.c (Fcall_process_region): Include directory component
diff --git a/src/dispnew.c b/src/dispnew.c
index d8808de3caa..a23f2b9a959 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -332,11 +332,13 @@ DEFUN ("dump-redisplay-history", Fdump_redisplay_history,
 #endif /* GLYPH_DEBUG == 0 */
 
 
-#if defined PROFILING && !HAVE___EXECUTABLE_START
-/* FIXME: only used to find text start for profiling.  */
-
+#if (defined PROFILING \
+     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__) \
+     && !HAVE___EXECUTABLE_START)
+/* This function comes first in the Emacs executable and is used only
+   to estimate the text start for profiling.  */
 void
-safe_bcopy (const char *from, char *to, int size)
+__executable_start (void)
 {
   abort ();
 }
diff --git a/src/emacs.c b/src/emacs.c
index d3e8e4466e3..8ffacdab1c6 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -65,6 +65,12 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "nsterm.h"
 #endif
 
+#if (defined PROFILING \
+     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
+# include <sys/gmon.h>
+extern void moncontrol (int mode);
+#endif
+
 #ifdef HAVE_X_WINDOWS
 #include "xterm.h"
 #endif
@@ -320,9 +326,9 @@ pthread_t main_thread;
 #ifdef HAVE_NS
 /* NS autrelease pool, for memory management.  */
 static void *ns_pool;
-#endif  
+#endif
+
 
- 
 
 /* Handle bus errors, invalid instruction, etc.  */
 #ifndef FLOAT_CATCH_SIGILL
@@ -1664,32 +1670,14 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
 #ifdef PROFILING
   if (initialized)
     {
-      extern void _mcleanup ();
 #ifdef __MINGW32__
       extern unsigned char etext asm ("etext");
 #else
       extern char etext;
 #endif
-#ifdef HAVE___EXECUTABLE_START
-      /* This symbol is defined by GNU ld to the start of the text
-         segment.  */
-      extern char __executable_start[];
-#else
-      extern void safe_bcopy ();
-#endif
 
       atexit (_mcleanup);
-#ifdef HAVE___EXECUTABLE_START
-      monstartup (__executable_start, &etext);
-#else
-      /* This uses safe_bcopy because that function comes first in the
-         Emacs executable.  It might be better to use something that
-         gives the start of the text segment, but start_of_text is not
-         defined on all systems now.  */
-      /* FIXME: Does not work on architectures with function
-         descriptors.  */
-      monstartup (safe_bcopy, &etext);
-#endif
+      monstartup ((uintptr_t) __executable_start, (uintptr_t) &etext);
     }
   else
     moncontrol (0);
diff --git a/src/lisp.h b/src/lisp.h
index a05e3075ec7..de627b9f4ad 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -2758,6 +2758,10 @@ extern void replace_range_2 (ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t,
 extern void syms_of_insdel (void);
 
 /* Defined in dispnew.c */
+#if (defined PROFILING \
+     && (defined __FreeBSD__ || defined GNU_LINUX || defined __MINGW32__))
+void __executable_start (void) NO_RETURN;
+#endif
 extern Lisp_Object selected_frame;
 extern Lisp_Object Vwindow_system;
 EXFUN (Fding, 1);