[RFC V1 08/14] qom: get properties

[Steve Sistare <steven.sistare@oracle.com>]

Extract a subroutine from user_creatable_add_qapi that converts object
options to a dictionary of properties and returns them.  Use g_autoptr
to simplify the code.  No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/qapi/visitor.h          |  1 +
 include/qom/object_interfaces.h |  8 ++++++++
 qom/object_interfaces.c         | 27 ++++++++++++++-------------
 3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 27b85d4..640b941 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -268,6 +268,7 @@ void visit_complete(Visitor *v, void *opaque);
  */
 void visit_free(Visitor *v);
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(Visitor, visit_free)
 
 /*** Visiting structures ***/
 
diff --git a/include/qom/object_interfaces.h b/include/qom/object_interfaces.h
index 02b11a7..2384263 100644
--- a/include/qom/object_interfaces.h
+++ b/include/qom/object_interfaces.h
@@ -98,6 +98,14 @@ Object *user_creatable_add_type(const char *type, const char *id,
 void user_creatable_add_qapi(ObjectOptions *options, Error **errp);
 
 /**
+ * user_creatable_get_props:
+ * @options: the object definition
+ *
+ * Convert @options to a dictionary of properties and return it.
+ */
+QDict *user_creatable_get_props(ObjectOptions *options);
+
+/**
  * user_creatable_parse_str:
  * @str: the object definition string as passed on the command line
  * @errp: if an error occurs, a pointer to an area to store the error
diff --git a/qom/object_interfaces.c b/qom/object_interfaces.c
index e0833c8..104d75c 100644
--- a/qom/object_interfaces.c
+++ b/qom/object_interfaces.c
@@ -139,26 +139,27 @@ out:
 
 void user_creatable_add_qapi(ObjectOptions *options, Error **errp)
 {
-    Visitor *v;
-    QObject *qobj;
-    QDict *props;
-    Object *obj;
+    g_autoptr(Visitor) v;
+    g_autoptr(Object) obj;
+    g_autoptr(QDict) props = user_creatable_get_props(options);
 
-    v = qobject_output_visitor_new(&qobj);
-    visit_type_ObjectOptions(v, NULL, &options, &error_abort);
-    visit_complete(v, &qobj);
-    visit_free(v);
-
-    props = qobject_to(QDict, qobj);
     qdict_del(props, "qom-type");
     qdict_del(props, "id");
 
     v = qobject_input_visitor_new(QOBJECT(props));
     obj = user_creatable_add_type(ObjectType_str(options->qom_type),
                                   options->id, props, v, errp);
-    object_unref(obj);
-    qobject_unref(qobj);
-    visit_free(v);
+}
+
+QDict *user_creatable_get_props(ObjectOptions *options)
+{
+    g_autoptr(Visitor) v;
+    QObject *qobj;
+
+    v = qobject_output_visitor_new(&qobj);
+    visit_type_ObjectOptions(v, NULL, &options, &error_abort);
+    visit_complete(v, &qobj);
+    return qobject_to(QDict, qobj);
 }
 
 char *object_property_help(const char *name, const char *type,
-- 
1.8.3.1