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qom: add object_property_add_alias()

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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 <stefanha@redhat.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Stefan Hajnoczi 2014-06-18 17:58:28 +08:00
parent 53a259da56
commit ef7c7ff6d4
2 changed files with 71 additions and 0 deletions
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20
include/qom/object.h
View file

@ -1230,6 +1230,26 @@ void object_property_add_uint32_ptr(Object *obj, const char *name,
void object_property_add_uint64_ptr(Object *obj, const char *name,
const uint64_t *v, Error **Errp);
/**
* object_property_add_alias:
* @obj: the object to add a property to
* @name: the name of the property
* @target_obj: the object to forward property access to
* @target_name: the name of the property on the forwarded object
* @errp: if an error occurs, a pointer to an area to store the error
*
* Add an alias for a property on an object. This function will add a property
* of the same type as the forwarded property.
*
* The caller must ensure that <code>@target_obj</code> stays alive as long as
* this property exists. In the case of a child object or an alias on the same
* object this will be the case. For aliases to other objects the caller is
* responsible for taking a reference.
*/
void object_property_add_alias(Object *obj, const char *name,
Object *target_obj, const char *target_name,
Error **errp);
/**
* object_child_foreach:
* @obj: the object whose children will be navigated

51
qom/object.c
View file

@ -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);