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object: qom module support

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Little helper function to load modules on demand.  In most cases adding
module loading support for devices and other objects is just
s/object_class_by_name/module_object_class_by_name/ in the right spot.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200624131045.14512-3-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-06-24 15:10:37 +02:00
parent 28457744c3
commit 0f8198f1b2
2 changed files with 26 additions and 0 deletions
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12
include/qom/object.h
View File

@ -994,6 +994,18 @@ bool object_class_is_abstract(ObjectClass *klass);
*/
ObjectClass *object_class_by_name(const char *typename);
/**
* module_object_class_by_name:
* @typename: The QOM typename to obtain the class for.
*
* For objects which might be provided by a module. Behaves like
* object_class_by_name, but additionally tries to load the module
* needed in case the class is not available.
*
* Returns: The class for @typename or %NULL if not found.
*/
ObjectClass *module_object_class_by_name(const char *typename);
void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
const char *implements_type, bool include_abstract,
void *opaque);

14
qom/object.c
View File

@ -985,6 +985,20 @@ ObjectClass *object_class_by_name(const char *typename)
return type->class;
}
ObjectClass *module_object_class_by_name(const char *typename)
{
ObjectClass *oc;
oc = object_class_by_name(typename);
#ifdef CONFIG_MODULES
if (!oc) {
module_load_qom_one(typename);
oc = object_class_by_name(typename);
}
#endif
return oc;
}
ObjectClass *object_class_get_parent(ObjectClass *class)
{
TypeImpl *type = type_get_parent(class->type);