From ef7c7ff6d4ca1955278af1bc5025f47044183250 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Wed, 18 Jun 2014 17:58:28 +0800 Subject: qom: add object_property_add_alias() Sometimes an object needs to present a property which is actually on another object, or it needs to provide an alias name for an existing property. Examples: a.foo -> b.foo a.old_name -> a.new_name The new object_property_add_alias() API allows objects to alias a property on the same object or another object. The source and target names can be different. Signed-off-by: Stefan Hajnoczi Reviewed-by: Peter Crosthwaite --- qom/object.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'qom/object.c') diff --git a/qom/object.c b/qom/object.c index 3876618..a760514 100644 --- a/qom/object.c +++ b/qom/object.c @@ -1550,6 +1550,57 @@ void object_property_add_uint64_ptr(Object *obj, const char *name, NULL, NULL, (void *)v, errp); } +typedef struct { + Object *target_obj; + const char *target_name; +} AliasProperty; + +static void property_get_alias(Object *obj, struct Visitor *v, void *opaque, + const char *name, Error **errp) +{ + AliasProperty *prop = opaque; + + object_property_get(prop->target_obj, v, prop->target_name, errp); +} + +static void property_set_alias(Object *obj, struct Visitor *v, void *opaque, + const char *name, Error **errp) +{ + AliasProperty *prop = opaque; + + object_property_set(prop->target_obj, v, prop->target_name, errp); +} + +static void property_release_alias(Object *obj, const char *name, void *opaque) +{ + AliasProperty *prop = opaque; + + g_free(prop); +} + +void object_property_add_alias(Object *obj, const char *name, + Object *target_obj, const char *target_name, + Error **errp) +{ + AliasProperty *prop; + ObjectProperty *target_prop; + + target_prop = object_property_find(target_obj, target_name, errp); + if (!target_prop) { + return; + } + + prop = g_malloc(sizeof(*prop)); + prop->target_obj = target_obj; + prop->target_name = target_name; + + object_property_add(obj, name, target_prop->type, + property_get_alias, + property_set_alias, + property_release_alias, + prop, errp); +} + static void object_instance_init(Object *obj) { object_property_add_str(obj, "type", qdev_get_type, NULL, NULL); -- cgit v1.1