qom: export more functions for use with non-UserCreatable objects

Machines and accelerators are not user-creatable but they are going
to share similar command-line parsing machinery.  Export functions
that will be used with -machine and -accel in softmmu/vl.c.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/qom/object.h

@@ -861,6 +861,29 @@ static void do_qemu_init_ ## type_array(void)                               \
 }                                                                           \
 type_init(do_qemu_init_ ## type_array)
 
+/**
+ * type_print_class_properties:
+ * @type: a QOM class name
+ *
+ * Print the object's class properties to stdout or the monitor.
+ * Return whether an object was found.
+ */
+bool type_print_class_properties(const char *type);
+
+/**
+ * object_set_properties_from_keyval:
+ * @obj: a QOM object
+ * @qdict: a dictionary with the properties to be set
+ * @from_json: true if leaf values of @qdict are typed, false if they
+ * are strings
+ * @errp: pointer to error object
+ *
+ * For each key in the dictionary, parse the value string if needed,
+ * then set the corresponding property in @obj.
+ */
+void object_set_properties_from_keyval(Object *obj, const QDict *qdict,
+                                       bool from_json, Error **errp);
+
 /**
  * object_class_dynamic_cast_assert:
  * @klass: The #ObjectClass to attempt to cast.

qom/object_interfaces.c

@@ -42,6 +42,44 @@ bool user_creatable_can_be_deleted(UserCreatable *uc)
     }
 }
 
+static void object_set_properties_from_qdict(Object *obj, const QDict *qdict,
+                                             Visitor *v, Error **errp)
+{
+    const QDictEntry *e;
+    Error *local_err = NULL;
+
+    if (!visit_start_struct(v, NULL, NULL, 0, &local_err)) {
+        goto out;
+    }
+    for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
+        if (!object_property_set(obj, e->key, v, &local_err)) {
+            break;
+        }
+    }
+    if (!local_err) {
+        visit_check_struct(v, &local_err);
+    }
+    visit_end_struct(v, NULL);
+
+out:
+    if (local_err) {
+        error_propagate(errp, local_err);
+    }
+}
+
+void object_set_properties_from_keyval(Object *obj, const QDict *qdict,
+                                       bool from_json, Error **errp)
+{
+    Visitor *v;
+    if (from_json) {
+        v = qobject_input_visitor_new(QOBJECT(qdict));
+    } else {
+        v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
+    }
+    object_set_properties_from_qdict(obj, qdict, v, errp);
+    visit_free(v);
+}
+
 Object *user_creatable_add_type(const char *type, const char *id,
                                 const QDict *qdict,
                                 Visitor *v, Error **errp)
@@ -49,7 +87,6 @@ Object *user_creatable_add_type(const char *type, const char *id,
     ERRP_GUARD();
     Object *obj;
     ObjectClass *klass;
-    const QDictEntry *e;
     Error *local_err = NULL;
 
     if (id != NULL && !id_wellformed(id)) {
@@ -78,18 +115,7 @@ Object *user_creatable_add_type(const char *type, const char *id,
 
     assert(qdict);
     obj = object_new(type);
-    if (!visit_start_struct(v, NULL, NULL, 0, &local_err)) {
+    object_set_properties_from_qdict(obj, qdict, v, &local_err);
-        goto out;
-    }
-    for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
-        if (!object_property_set(obj, e->key, v, &local_err)) {
-            break;
-        }
-    }
-    if (!local_err) {
-        visit_check_struct(v, &local_err);
-    }
-    visit_end_struct(v, NULL);
     if (local_err) {
         goto out;
     }
@@ -178,7 +204,7 @@ static void user_creatable_print_types(void)
     g_slist_free(list);
 }
 
-static bool user_creatable_print_type_properites(const char *type)
+bool type_print_class_properties(const char *type)
 {
     ObjectClass *klass;
     ObjectPropertyIterator iter;
@@ -224,7 +250,7 @@ bool user_creatable_print_help(const char *type, QemuOpts *opts)
     }
 
     if (qemu_opt_has_help_opt(opts)) {
-        return user_creatable_print_type_properites(type);
+        return type_print_class_properties(type);
     }
 
     return false;
@@ -234,7 +260,7 @@ static void user_creatable_print_help_from_qdict(QDict *args)
 {
     const char *type = qdict_get_try_str(args, "qom-type");
 
-    if (!type || !user_creatable_print_type_properites(type)) {
+    if (!type || !type_print_class_properties(type)) {
         user_creatable_print_types();
     }
 }