[patch] Fix oddity in personality routine

Hi,

r128098 has introduced an oddity in the personality routine:

  int ip_before_insn = 0;
[...]

  // Parse the LSDA header.
  p = parse_lsda_header (context, language_specific_data, &info);
#ifdef HAVE_GETIPINFO
  ip = _Unwind_GetIPInfo (context, &ip_before_insn);
#else
  ip = _Unwind_GetIP (context) - 1;
#endif
  if (! ip_before_insn)
    --ip;

So, if !HAVE_GETIPINFO, the IP is decremented by 2!  It used to be 1 and both 
libstdc++-v3/libsupc++/eh_personality.cc and ada/raise-gcc.c have the expected 
version:

#ifdef _GLIBCXX_HAVE_GETIPINFO
  ip = _Unwind_GetIPInfo (context, &ip_before_insn);
#else
  ip = _Unwind_GetIP (context);
#endif
  if (! ip_before_insn)
    --ip;

Hence the attached patch, that I don't plan to test though.  OK anyway?


2009-11-13  Eric Botcazou  <[email protected]>

	* exception.cc (PERSONALITY_FUNCTION): Fix oversight.


-- 
Eric Botcazou

Index: exception.cc
===================================================================
--- exception.cc	(revision 154059)
+++ exception.cc	(working copy)
@@ -328,7 +328,7 @@ PERSONALITY_FUNCTION (int version,
 #ifdef HAVE_GETIPINFO
   ip = _Unwind_GetIPInfo (context, &ip_before_insn);
 #else
-  ip = _Unwind_GetIP (context) - 1;
+  ip = _Unwind_GetIP (context);
 #endif
   if (! ip_before_insn)
     --ip;