Fix probe-related internal error on AIX

-- Initial message by Tom Tromey:

While testing on AIX, I happened to notice an internal error coming
from parse_probes.  This happens because there are no probes defined
on this platform.  This patch fixes the problem by changing an assert
into an ordinary error, and then changing the relevant caller to cope.

This fixes a few tests on AIX; also regtested on x86-64 Fedora 18.

-- Followup by Sergio Durigan Junior:

By reading the patch (and the original code), I found it a little bit
obscure, so I took the liberty to try to improve it.  Here's the patch.
Could you please take a look and see if it works on AIX (and also if you
like the approach)?

gdb/
2014-03-20  Tom Tromey  <tromey@redhat.com>
	    Sergio Durigan Junior  <sergiodj@redhat.com>

	* probe.c (parse_probes): Turn assert into an ordinary error.
	* break-catch-throw.c (re_set_exception_catchpoint): Ignore
	exceptions when parsing probes.  Rearrange the code for clarity.

1 files changed, 20 insertions, 17 deletions

diff --git a/gdb/break-catch-throw.c b/gdb/break-catch-throw.c
index 7283490..9831d96 100644
--- a/gdb/break-catch-throw.c
+++ b/gdb/break-catch-throw.c
@@ -207,29 +207,32 @@ re_set_exception_catchpoint (struct breakpoint *self)
   volatile struct gdb_exception e;
   struct cleanup *cleanup;
   enum exception_event_kind kind = classify_exception_breakpoint (self);
-  int pass;
 
-  for (pass = 0; sals.sals == NULL && pass < 2; ++pass)
+  /* We first try to use the probe interface.  */
+  TRY_CATCH (e, RETURN_MASK_ERROR)
     {
-      TRY_CATCH (e, RETURN_MASK_ERROR)
+      char *spec = ASTRDUP (exception_functions[kind].probe);
+
+      sals = parse_probes (&spec, NULL);
+    }
+
+  if (e.reason < 0)
+    {
+      volatile struct gdb_exception ex;
+
+      /* Using the probe interface failed.  Let's fallback to the normal
+	 catchpoint mode.  */
+      TRY_CATCH (ex, RETURN_MASK_ERROR)
 	{
-	  char *spec;
-
-	  if (pass == 0)
-	    {
-	      spec = ASTRDUP (exception_functions[kind].probe);
-	      sals = parse_probes (&spec, NULL);
-	    }
-	  else
-	    {
-	      spec = ASTRDUP (exception_functions[kind].function);
-	      self->ops->decode_linespec (self, &spec, &sals);
-	    }
+	  char *spec = ASTRDUP (exception_functions[kind].function);
+
+	  self->ops->decode_linespec (self, &spec, &sals);
 	}
+
       /* NOT_FOUND_ERROR just means the breakpoint will be pending, so
 	 let it through.  */
-      if (e.reason < 0 && e.error != NOT_FOUND_ERROR)
-	throw_exception (e);
+      if (ex.reason < 0 && ex.error != NOT_FOUND_ERROR)
+	throw_exception (ex);
     }
 
   cleanup = make_cleanup (xfree, sals.sals);