[RFC PATCH 04/12] qom: Add instance_config() to TypeInfo

[Kevin Wolf <kwolf@redhat.com>]

Instead of providing the whole configuration through property setters,
object_config() can now use the instance_config() callback. Options that
are not consumed by the callback (e.g. because they belong to a parent
class that hasn't been converted to the new callback yet) are still set
as properties.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 include/qom/object.h |  4 ++++
 qom/object.c         | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/qom/object.h b/include/qom/object.h
index d67ba2411d..e60cacb54b 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -384,6 +384,9 @@ struct Object
  *   for initializing its own members.
  * @instance_post_init: This function is called to finish initialization of
  *   an object, after all @instance_init functions were called.
+ * @instance_config: This function is called to set the initial configuration
+ *   of an object.  If not provided, configuration is done through property
+ *   setters.
  * @instance_finalize: This function is called during object destruction.  This
  *   is called before the parent @instance_finalize function has been called.
  *   An object should only free the members that are unique to its type in this
@@ -419,6 +422,7 @@ struct TypeInfo
     size_t instance_align;
     void (*instance_init)(Object *obj);
     void (*instance_post_init)(Object *obj);
+    bool (*instance_config)(Object *obj, Visitor *v, Error **errp);
     void (*instance_finalize)(Object *obj);
 
     bool abstract;
diff --git a/qom/object.c b/qom/object.c
index d8da362987..6cacfa9ab1 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -60,6 +60,7 @@ struct TypeImpl
 
     void (*instance_init)(Object *obj);
     void (*instance_post_init)(Object *obj);
+    bool (*instance_config)(Object *obj, Visitor *v, Error **errp);
     void (*instance_finalize)(Object *obj);
 
     bool abstract;
@@ -124,6 +125,7 @@ static TypeImpl *type_new(const TypeInfo *info)
 
     ti->instance_init = info->instance_init;
     ti->instance_post_init = info->instance_post_init;
+    ti->instance_config = info->instance_config;
     ti->instance_finalize = info->instance_finalize;
 
     ti->abstract = info->abstract;
@@ -303,6 +305,7 @@ static void type_initialize(TypeImpl *ti)
         assert(ti->abstract);
         assert(!ti->instance_init);
         assert(!ti->instance_post_init);
+        assert(!ti->instance_config);
         assert(!ti->instance_finalize);
         assert(!ti->num_interfaces);
     }
@@ -607,11 +610,23 @@ void object_initialize_child_internal(Object *parent,
 
 void object_configure(Object *obj, Visitor *v, Error **errp)
 {
+    TypeImpl *ti;
     const char *key;
 
     if (!visit_start_struct(v, NULL, NULL, 0, errp)) {
         return;
     }
+
+    /* Call .instance_config, including for all parent classes */
+    for (ti = obj->class->type; ti; ti = ti->parent_type) {
+        if (ti->instance_config) {
+            if (!ti->instance_config(obj, v, errp)) {
+                goto out;
+            }
+        }
+    }
+
+    /* Set options not consumed by .instance_config as properties */
     while ((key = visit_next_struct_member(v))) {
         if (!object_property_set(obj, key, v, errp)) {
             goto out;
-- 
2.31.1