qom: Introduce instance_post_init hook

This will allow classes to specify a function to be called after all
instance_init functions were called.

This will be used by DeviceState to call qdev_prop_set_globals() at the
right moment.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

2 files changed, 17 insertions, 0 deletions

diff --git a/include/qom/object.h b/include/qom/object.h
index 23fc048..9b69065 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -398,6 +398,8 @@ struct Object
  * @instance_init: This function is called to initialize an object.  The parent
  *   class will have already been initialized so the type is only responsible
  *   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_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
@@ -433,6 +435,7 @@ struct TypeInfo
 
     size_t instance_size;
     void (*instance_init)(Object *obj);
+    void (*instance_post_init)(Object *obj);
     void (*instance_finalize)(Object *obj);
 
     bool abstract;
diff --git a/qom/object.c b/qom/object.c
index b2479d1..74fd241 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -51,6 +51,7 @@ struct TypeImpl
     void *class_data;
 
     void (*instance_init)(Object *obj);
+    void (*instance_post_init)(Object *obj);
     void (*instance_finalize)(Object *obj);
 
     bool abstract;
@@ -111,6 +112,7 @@ static TypeImpl *type_register_internal(const TypeInfo *info)
     ti->class_data = info->class_data;
 
     ti->instance_init = info->instance_init;
+    ti->instance_post_init = info->instance_post_init;
     ti->instance_finalize = info->instance_finalize;
 
     ti->abstract = info->abstract;
@@ -298,6 +300,17 @@ static void object_init_with_type(Object *obj, TypeImpl *ti)
     }
 }
 
+static void object_post_init_with_type(Object *obj, TypeImpl *ti)
+{
+    if (ti->instance_post_init) {
+        ti->instance_post_init(obj);
+    }
+
+    if (type_has_parent(ti)) {
+        object_post_init_with_type(obj, type_get_parent(ti));
+    }
+}
+
 void object_initialize_with_type(void *data, TypeImpl *type)
 {
     Object *obj = data;
@@ -313,6 +326,7 @@ void object_initialize_with_type(void *data, TypeImpl *type)
     object_ref(obj);
     QTAILQ_INIT(&obj->properties);
     object_init_with_type(obj, type);
+    object_post_init_with_type(obj, type);
 }
 
 void object_initialize(void *data, const char *typename)