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GObject: warn on use of deprecated properties

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By default G_PARAM_DEPRECATED means absolutely nothing.  We only emit a
warning if G_ENABLE_DIAGNOSTIC is set to '1' and then, only on sets.

Turn the logic on its head: emit the warning by default, unless
G_ENABLE_DIAGNOSTIC is set to 0.  In order to avoid a torrent of output, only
emit a warning once per property name.

https://bugzilla.gnome.org/show_bug.cgi?id=732184
This commit is contained in:
Ryan Lortie 2014-06-24 16:13:30 -04:00
parent c5c3c320a2
commit d0e7061785
1 changed files with 63 additions and 20 deletions
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83
gobject/gobject.c
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@ -1295,6 +1295,53 @@ g_object_thaw_notify (GObject *object)
g_object_unref (object);
}
static gboolean
should_issue_prop_deprecation_warning (const GParamSpec *pspec)
{
static GHashTable *already_warned_table;
static const gchar *enable_diagnostic;
static GMutex already_warned_lock;
gboolean already;
if (!(pspec->flags & G_PARAM_DEPRECATED))
return FALSE;
if (g_once_init_enter (&enable_diagnostic))
{
const gchar *value = g_getenv ("G_ENABLE_DIAGNOSTIC");
if (!value)
value = "-";
g_once_init_leave (&enable_diagnostic, value);
}
if (enable_diagnostic[0] == '0')
return FALSE;
/* We hash only on property names: this means that we could end up in
* a situation where we fail to emit a warning about a pair of
* same-named deprecated properties used on two separate types.
* That's pretty unlikely to occur, and even if it does, you'll still
* have seen the warning for the first one...
*
* Doing it this way lets us hash directly on the (interned) property
* name pointers.
*/
g_mutex_lock (&already_warned_lock);
if (already_warned_table == NULL)
already_warned_table = g_hash_table_new (NULL, NULL);
already = g_hash_table_contains (already_warned_table, (gpointer) pspec->name);
if (!already)
g_hash_table_add (already_warned_table, (gpointer) pspec->name);
g_mutex_unlock (&already_warned_lock);
return !already;
}
static inline void
object_get_property (GObject *object,
GParamSpec *pspec,
@ -1313,8 +1360,15 @@ object_get_property (GObject *object,
redirect = g_param_spec_get_redirect_target (pspec);
if (redirect)
pspec = redirect;
pspec = redirect;
if (should_issue_prop_deprecation_warning (pspec))
{
g_warning ("The property %s:%s is deprecated and shouldn't be used "
"anymore. It will be removed in a future version.",
G_OBJECT_TYPE_NAME (object), pspec->name);
}
class->get_property (object, param_id, value, pspec);
}
@ -1328,7 +1382,6 @@ object_set_property (GObject *object,
GObjectClass *class = g_type_class_peek (pspec->owner_type);
guint param_id = PARAM_SPEC_PARAM_ID (pspec);
GParamSpec *redirect;
static const gchar * enable_diagnostic = NULL;
if (class == NULL)
{
@ -1341,25 +1394,15 @@ object_set_property (GObject *object,
if (redirect)
pspec = redirect;
if (G_UNLIKELY (!enable_diagnostic))
if (pspec->flags & G_PARAM_DEPRECATED)
{
enable_diagnostic = g_getenv ("G_ENABLE_DIAGNOSTIC");
if (!enable_diagnostic)
enable_diagnostic = "0";
}
if (enable_diagnostic[0] == '1')
{
if (pspec->flags & G_PARAM_DEPRECATED)
/* don't warn for automatically provided construct properties */
if (!(pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) || !object_in_construction (object))
{
/* don't warn for automatically provided construct properties */
if (!(pspec->flags & (G_PARAM_CONSTRUCT | G_PARAM_CONSTRUCT_ONLY)) ||
!object_in_construction (object))
{
g_warning ("The property %s:%s is deprecated and shouldn't be used "
"anymore. It will be removed in a future version.",
G_OBJECT_TYPE_NAME (object), pspec->name);
}
if (should_issue_prop_deprecation_warning (pspec))
g_warning ("The property %s:%s is deprecated and shouldn't be used "
"anymore. It will be removed in a future version.",
G_OBJECT_TYPE_NAME (object), pspec->name);
}
}