+template <class VariantSelectorMappingIntegerType>
+typename lst::variant_type<VariantSelectorMappingIntegerType>::choices
+create_typed_variant_choices(const lttng_ust_ctl_field *current,
+ const lttng_ust_ctl_field *end,
+ const session_attributes& session_attributes,
+ const lttng_ust_ctl_field **next_ust_ctl_field,
+ lookup_field_fn lookup_field,
+ lst::field_location::root lookup_root,
+ lst::field_location::elements& current_field_location_elements,
+ unsigned int choice_count,
+ const lst::field& selector_field,
+ lsu::ctl_field_quirks quirks)
+{
+ typename lst::variant_type<VariantSelectorMappingIntegerType>::choices choices;
+ const auto& typed_enumeration =
+ static_cast<const lst::typed_enumeration_type<VariantSelectorMappingIntegerType>&>(
+ selector_field.get_type());
+
+ for (unsigned int i = 0; i < choice_count; i++) {
+ create_field_from_ust_ctl_fields(
+ current,
+ end,
+ session_attributes,
+ next_ust_ctl_field,
+ [&choices, typed_enumeration, &selector_field, quirks](
+ lst::field::uptr field) {
+ /*
+ * Find the enumeration mapping that matches the
+ * field's name.
+ */
+ const auto mapping_it = std::find_if(
+ typed_enumeration.mappings_->begin(),
+ typed_enumeration.mappings_->end(),
+ [&field,
+ quirks](const typename std::remove_reference<
+ decltype(typed_enumeration)>::type::mapping&
+ mapping) {
+ if (static_cast<bool>(
+ quirks &
+ lsu::ctl_field_quirks::
+ UNDERSCORE_PREFIXED_VARIANT_TAG_MAPPINGS)) {
+ /*
+ * Check if they match with
+ * a prepended underscore
+ * and, if not, perform the
+ * regular check.
+ */
+ if ((std::string("_") + field->name) ==
+ mapping.name) {
+ return true;
+ }
+ }
+
+ return mapping.name == field->name;
+ });
+
+ if (mapping_it == typed_enumeration.mappings_->end()) {
+ LTTNG_THROW_PROTOCOL_ERROR(fmt::format(
+ "Invalid variant choice: `{}` does not match any mapping in `{}` enumeration",
+ field->name,
+ selector_field.name));
+ }
+
+ choices.emplace_back(*mapping_it, field->move_type());
+ },
+ lookup_field,
+ lookup_root,
+ current_field_location_elements,
+ quirks);
+
+ current = *next_ust_ctl_field;
+ }
+
+ return choices;
+}
+
+lst::type::cuptr create_variant_field_from_ust_ctl_fields(
+ const lttng_ust_ctl_field *current,
+ const lttng_ust_ctl_field *end,
+ const session_attributes& session_attributes,
+ const lttng_ust_ctl_field **next_ust_ctl_field,
+ const lookup_field_fn& lookup_field,
+ lst::field_location::root lookup_root,
+ lst::field_location::elements& current_field_location_elements,
+ lsu::ctl_field_quirks quirks)