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2008-10-16 Emmanuele Bassi <ebassi@linux.intel.com>

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* clutter/clutter-container.[ch]: Add checks to the Container
	interface invocation methods, to avoid crashing or corrupting
	the stack when an actor does not implement every virtual
	function of the Container interface vtable. GObject allows this
	to happen so we must handle the case gracefully. This also means
	that we can classify some virtual function as mandatory (as is
	the case for ::add, ::remove and ::foreach) and some other
	optional.
This commit is contained in:
Emmanuele Bassi
2008-10-16 10:28:17 +00:00
parent 3d08e5f3d2
commit 6d4667cb61
3 changed files with 111 additions and 35 deletions
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119
clutter/clutter-container.c
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@ -43,6 +43,23 @@
#include "clutter-private.h"
#include "clutter-enum-types.h"
#define CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED(container,vfunc) \
G_STMT_START { \
g_warning ("Container of type `%s' does not implement " \
"the required ClutterContainer::%s virtual " \
"function.", \
G_OBJECT_TYPE_NAME ((container)), \
(vfunc)); \
} G_STMT_END
#define CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED(container,vfunc) \
G_STMT_START { \
CLUTTER_NOTE (ACTOR, "Container of type `%s' does not " \
"implement the ClutterContainer::%s " \
"virtual function.", \
G_OBJECT_TYPE_NAME ((container)), \
(vfunc)); \
} G_STMT_END
/**
* SECTION:clutter-container
@ -69,24 +86,17 @@ enum
static guint container_signals[LAST_SIGNAL] = { 0, };
static GQuark quark_child_meta = 0;
static ClutterChildMeta *
get_child_meta (ClutterContainer *container,
ClutterActor *actor);
static ClutterChildMeta *get_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
clutter_container_create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
clutter_container_destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void clutter_container_create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void clutter_container_destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
@ -178,7 +188,7 @@ clutter_container_get_type (void)
if (G_UNLIKELY (!container_type))
{
GTypeInfo container_info =
const GTypeInfo container_info =
{
sizeof (ClutterContainerIface),
clutter_container_base_init,
@ -239,17 +249,25 @@ void
clutter_container_add_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterContainerIface *iface;
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->add)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "add");
return;
}
parent = clutter_actor_get_parent (actor);
if (parent)
{
g_warning ("Attempting to add actor of type `%s' to a "
"group of type `%s', but the actor has already "
"a parent of type `%s'.",
"container of type `%s', but the actor has "
"already a parent of type `%s'.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)),
g_type_name (G_OBJECT_TYPE (parent)));
@ -257,7 +275,8 @@ clutter_container_add_actor (ClutterContainer *container,
}
clutter_container_create_child_meta (container, actor);
CLUTTER_CONTAINER_GET_IFACE (container)->add (container, actor);
iface->add (container, actor);
}
/**
@ -333,24 +352,33 @@ void
clutter_container_remove_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterContainerIface *iface;
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->remove)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "remove");
return;
}
parent = clutter_actor_get_parent (actor);
if (parent != CLUTTER_ACTOR (container))
{
g_warning ("Attempting to remove actor of type `%s' from "
"group of class `%s', but the group is not the "
"actor's parent.",
"group of class `%s', but the container is not "
"the actor's parent.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)));
return;
}
clutter_container_destroy_child_meta (container, actor);
CLUTTER_CONTAINER_GET_IFACE (container)->remove (container, actor);
iface->remove (container, actor);
}
/**
@ -429,12 +457,19 @@ clutter_container_foreach (ClutterContainer *container,
ClutterCallback callback,
gpointer user_data)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (callback != NULL);
CLUTTER_CONTAINER_GET_IFACE (container)->foreach (container,
callback,
user_data);
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->foreach)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "foreach");
return;
}
iface->foreach (container, callback, user_data);
}
/**
@ -452,10 +487,19 @@ clutter_container_raise_child (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (sibling == NULL || CLUTTER_IS_ACTOR (sibling));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->raise)
{
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "raise");
return;
};
if (actor == sibling)
return;
@ -478,7 +522,7 @@ clutter_container_raise_child (ClutterContainer *container,
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->raise (container, actor, sibling);
iface->raise (container, actor, sibling);
}
/**
@ -496,10 +540,19 @@ clutter_container_lower_child (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (sibling == NULL || CLUTTER_IS_ACTOR (sibling));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->lower)
{
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "lower");
return;
}
if (actor == sibling)
return;
@ -522,7 +575,7 @@ clutter_container_lower_child (ClutterContainer *container,
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->lower (container, actor, sibling);
iface->lower (container, actor, sibling);
}
/**
@ -537,9 +590,15 @@ clutter_container_lower_child (ClutterContainer *container,
void
clutter_container_sort_depth_order (ClutterContainer *container)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
CLUTTER_CONTAINER_GET_IFACE (container)->sort_depth_order (container);
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (iface->sort_depth_order)
iface->sort_depth_order (container);
else
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "sort_depth_order");
}
/**