2011-01-10 Michael Snyder <msnyder@vmware.com>

[thirdparty/binutils-gdb.git] / gdb / observer.c

diff --git a/gdb/observer.c b/gdb/observer.c
index 20bc8aa2004602d9af875ca3b56a254e61060733..de59ac67da23995cfd7c4ea5938ae21945360aa5 100644 (file)
--- a/gdb/observer.c
+++ b/gdb/observer.c
@@ -1,11 +1,13 @@
 /* GDB Notifications to Observers.
-   Copyright 2003 Free Software Foundation, Inc.
+
+   Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010, 2011
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
    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 2 of the License, or
+   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,
@@ -14,14 +16,12 @@
    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, write to the Free Software
-   Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* An observer is an entity who is interested in being notified when GDB
-   reaches certain states, or certain events occur in GDB. The entity being
-   observed is called the Subject. To receive notifications, the observer
-   attaches a callback to the subject. One subject can have several
+   reaches certain states, or certain events occur in GDB.  The entity being
+   observed is called the Subject.  To receive notifications, the observer
+   attaches a callback to the subject.  One subject can have several
    observers.
 
    This file implements an internal generic low-level event notification
@@ -31,15 +31,15 @@
    for all possible notifications.
 
    The current implementation of the generic observer provides support
-   for contextual data. This contextual data is given to the subject
-   when attaching the callback. In return, the subject will provide
+   for contextual data.  This contextual data is given to the subject
+   when attaching the callback.  In return, the subject will provide
    this contextual data back to the observer as a parameter of the
    callback.
 
    FIXME: The current support for the contextual data is only partial,
    as it lacks a mechanism that would deallocate this data when the
-   callback is detached. This is not a problem so far, as this contextual
-   data is only used internally to hold a function pointer. Later on,
+   callback is detached.  This is not a problem so far, as this contextual
+   data is only used internally to hold a function pointer.  Later on,
    if a certain observer needs to provide support for user-level
    contextual data, then the generic notification mechanism will need
    need to be enhanced to allow the observer to provide a routine to
@@ -52,6 +52,16 @@
 
 #include "defs.h"
 #include "observer.h"
+#include "command.h"
+#include "gdbcmd.h"
+
+static int observer_debug;
+static void
+show_observer_debug (struct ui_file *file, int from_tty,
+                    struct cmd_list_element *c, const char *value)
+{
+  fprintf_filtered (file, _("Observer debugging is %s.\n"), value);
+}
 
 /* The internal generic observer.  */
 
@@ -81,6 +91,7 @@ static struct observer_list *
 xalloc_observer_list_node (void)
 {
   struct observer_list *node = XMALLOC (struct observer_list);
+
   node->observer = XMALLOC (struct observer);
   return node;
 }
@@ -141,7 +152,7 @@ generic_observer_detach (struct observer_list **subject,
 
   /* We should never reach this point.  However, this should not be
      a very serious error, so simply report a warning to the user.  */
-  warning ("Failed to detach observer");
+  warning (_("Failed to detach observer"));
 }
 
 /* Send a notification to all the observers of SUBJECT.  ARGS is passed to
@@ -172,21 +183,36 @@ int observer_test_second_observer = 0;
 int observer_test_third_observer = 0;
 
 void
-observer_test_first_notification_function (void)
+observer_test_first_notification_function (int arg)
 {
   observer_test_first_observer++;
 }
 
 void
-observer_test_second_notification_function (void)
+observer_test_second_notification_function (int arg)
 {
   observer_test_second_observer++;
 }
 
 void
-observer_test_third_notification_function (void)
+observer_test_third_notification_function (int arg)
 {
   observer_test_third_observer++;
 }
 
+extern initialize_file_ftype _initialize_observer; /* -Wmissing-prototypes */
+
+void
+_initialize_observer (void)
+{
+  add_setshow_zinteger_cmd ("observer", class_maintenance,
+                           &observer_debug, _("\
+Set observer debugging."), _("\
+Show observer debugging."), _("\
+When non-zero, observer debugging is enabled."),
+                           NULL,
+                           show_observer_debug,
+                           &setdebuglist, &showdebuglist);
+}
+
 #include "observer.inc"