Implement GDB/MI equivalent of "info exceptions" CLI command.

This patch implements a new GDB/MI command implementing the equivalent
of the "info exceptions" CLI command.  The command syntax is:

    -info-ada-exceptions [REGEXP]

Here is an example of usage (slightly formatted by hand to make it
easier to read):

    -info-ada-exceptions ions\.a_
    ^done,ada-exceptions=
      {nr_rows="2",nr_cols="2",
       hdr=[{width="1",alignment="-1",col_name="name",colhdr="Name"},
            {width="1",alignment="-1",col_name="address",colhdr="Address"}],
       body=[{name="global_exceptions.a_global_exception",
              address="0x0000000000613a80"},
             {name="global_exceptions.a_private_exception",
              address="0x0000000000613ac0"}]}

Also, in order to allow graphical frontends to easily determine
whether this command is available or not, the output of the
"-list-features" command has been augmented to contain
"info-ada-exceptions".

gdb/Changelog:

        * mi/mi-cmds.h (mi_cmd_info_ada_exceptions): Add declaration.
        * mi/mi-cmds.c (mi_cmds): Add entry for -info-ada-exceptions
        command.
        * mi/mi-cmd-info.c: #include "ada-lang.c" and "arch-utils.c".
        (mi_cmd_info_ada_exceptions): New function.
        * mi/mi-main.c (mi_cmd_list_features): Add "info-ada-exceptions".

gdb/testsuite/ChangeLog:

        * gdb.ada/mi_exc_info: New testcase.

1 files changed, 51 insertions, 0 deletions

diff --git a/gdb/mi/mi-cmd-info.c b/gdb/mi/mi-cmd-info.c
index 8eb4220..aa4d210 100644
--- a/gdb/mi/mi-cmd-info.c
+++ b/gdb/mi/mi-cmd-info.c
@@ -19,6 +19,57 @@
 #include "defs.h"
 #include "osdata.h"
 #include "mi-cmds.h"
+#include "ada-lang.h"
+#include "arch-utils.h"
+
+/* Implement the "-info-ada-exceptions" GDB/MI command.  */
+
+void
+mi_cmd_info_ada_exceptions (char *command, char **argv, int argc)
+{
+  struct ui_out *uiout = current_uiout;
+  struct gdbarch *gdbarch = get_current_arch ();
+  char *regexp;
+  struct cleanup *old_chain;
+  VEC(ada_exc_info) *exceptions;
+  int ix;
+  struct ada_exc_info *info;
+
+  switch (argc)
+    {
+    case 0:
+      regexp = NULL;
+      break;
+    case 1:
+      regexp = argv[0];
+      break;
+    default:
+      error (_("Usage: -info-ada-exceptions [REGEXP]"));
+      break;
+    }
+
+  exceptions = ada_exceptions_list (regexp);
+  old_chain = make_cleanup (VEC_cleanup (ada_exc_info), &exceptions);
+
+  make_cleanup_ui_out_table_begin_end
+    (uiout, 2, VEC_length (ada_exc_info, exceptions), "ada-exceptions");
+  ui_out_table_header (uiout, 1, ui_left, "name", "Name");
+  ui_out_table_header (uiout, 1, ui_left, "address", "Address");
+  ui_out_table_body (uiout);
+
+  for (ix = 0; VEC_iterate(ada_exc_info, exceptions, ix, info); ix++)
+    {
+      struct cleanup *sub_chain;
+
+      sub_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
+      ui_out_field_string (uiout, "name", info->name);
+      ui_out_field_core_addr (uiout, "address", gdbarch, info->addr);
+
+      do_cleanups (sub_chain);
+    }
+
+  do_cleanups (old_chain);
+}
 
 void
 mi_cmd_info_os (char *command, char **argv, int argc)