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qdev: allow reusing get/set for legacy property

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In some cases, a legacy property does need a special print method
but not a special parse method.  In this case, we can reuse the get/set
from the static (non-legacy) property.

If neither parse nor print is needed, though, do not register the
legacy property at all.  The previous patch ensures that the right
fallback will be used.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-02-02 10:17:19 +01:00
parent d822979bdf
commit 68ee356941
1 changed files with 7 additions and 4 deletions
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11
hw/qdev.c
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@ -550,21 +550,24 @@ static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
* Do not use this is new code! Properties added through this interface will
* be given names and types in the "legacy" namespace.
*
* Legacy properties are always processed as strings. The format of the string
* depends on the property type.
* Legacy properties are string versions of other OOM properties. The format
* of the string depends on the property type.
*/
void qdev_property_add_legacy(DeviceState *dev, Property *prop,
Error **errp)
{
gchar *name, *type;
if (!prop->info->print && !prop->info->parse) {
return;
}
name = g_strdup_printf("legacy-%s", prop->name);
type = g_strdup_printf("legacy<%s>",
prop->info->legacy_name ?: prop->info->name);
object_property_add(OBJECT(dev), name, type,
prop->info->print ? qdev_get_legacy_property : NULL,
prop->info->parse ? qdev_set_legacy_property : NULL,
prop->info->print ? qdev_get_legacy_property : prop->info->get,
prop->info->parse ? qdev_set_legacy_property : prop->info->set,
NULL,
prop, errp);