improve Ada exception catchpoint MI notification

This rewrites the code generating the Ada exception catchpoint hit
notification for both the GDB/MI case as well as the non-MI case,
by using the relevant ui_out_* functions to generate the output.
the MI notifications for Ada exception catchpoints now include
the stop reason, and the breakpoint "disp", much like other breakpoint
events do.  It also introduces a new field "exception-name" for
exception catchpoints (excluding "failed assertion catchpoints,
where we just want to know that it was a failed assertion).

gdb/ChangeLog:

        * breakpoint.h (bpdisp_text): Add declaration.
        * breakpoint.c (bpdisp_text): Make non-static.
        * ada-lang.c: #include "mi/mi-common.h".
        (print_it_exception): Rewrite to improve GDB/MI output.

gdb/doc/ChangeLog:

        * gdb.texinfo (GDB/MI Ada Exception Information): Document
        the "exception-name" field in the *stopped async record.

gdb/testsuite/ChangeLog:

        * gdb.ada/mi_catch_ex: New testcase.

1 files changed, 43 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.ada/mi_catch_ex/foo.adb b/gdb/testsuite/gdb.ada/mi_catch_ex/foo.adb
new file mode 100644
index 0000000..a2eceac
--- /dev/null
+++ b/gdb/testsuite/gdb.ada/mi_catch_ex/foo.adb
@@ -0,0 +1,43 @@
+--  Copyright 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+--
+--  This program is free software; you can redistribute it and/or modify
+--  it under the terms of the GNU General Public License as published by
+--  the Free Software Foundation; either version 3 of the License, or
+--  (at your option) any later version.
+--
+--  This program is distributed in the hope that it will be useful,
+--  but WITHOUT ANY WARRANTY; without even the implied warranty of
+--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+--  GNU General Public License for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+procedure Foo is
+begin
+
+   begin
+      raise Constraint_Error;  -- SPOT1
+   exception
+      when others =>
+         null;
+   end;
+
+   begin
+      raise Program_Error;  -- SPOT2
+   exception
+      when others =>
+         null;
+   end;
+
+   begin
+      pragma Assert (False);  -- SPOT3
+      null;
+   exception
+      when others =>
+         null;
+   end;
+
+   raise Constraint_Error;  -- SPOT4
+
+end Foo;