#include <vendor/optional.hpp>
#include <functional>
+#include <unordered_map>
namespace lttng {
namespace sessiond {
using append_metadata_fragment_function = std::function<void(const std::string& fragment)>;
+namespace details {
+/*
+ * Register types to be overriden. For example, a TSDL-safe copy of a type can
+ * be added to be overriden whenever the original type is encountered.
+ *
+ * Note that this class assumes no ownership of the original types. It assumes
+ * that the original types live as long as the original trace.
+ */
+class type_overrider {
+public:
+ type_overrider() = default;
+
+ void publish(const lttng::sessiond::trace::type& original,
+ lttng::sessiond::trace::type::cuptr new_type_override);
+ const lttng::sessiond::trace::type& type(
+ const lttng::sessiond::trace::type& original) const noexcept;
+
+private:
+ std::unordered_map<const lttng::sessiond::trace::type *, lttng::sessiond::trace::type::cuptr>
+ _overriden_types;
+};
+} /* namespace details. */
+
+/*
+ * TSDL-producing trace class visitor.
+ *
+ * An instance of this class must not be used on multiple trace class instances.
+ * The `append_metadata` callback is automatically invoked when a coherent
+ * fragment of TSDL is available.
+ */
class trace_class_visitor : public lttng::sessiond::trace::trace_class_visitor {
public:
trace_class_visitor(const lttng::sessiond::trace::abi& trace_abi,
private:
/* Coherent (parseable) fragments must be appended. */
void append_metadata_fragment(const std::string& fragment) const;
+ const lttng::sessiond::trace::type& _lookup_field_type(
+ const lttng::sessiond::trace::field_location& field_location) const;
const lttng::sessiond::trace::abi& _trace_abi;
const append_metadata_fragment_function _append_metadata_fragment;
+ details::type_overrider _sanitized_types_overrides;
+
+ /*
+ * Current visit context.
+ *
+ * The members of a trace class hierarchy do not provide back-references
+ * up the hierarchy (e.g. stream class to its parent trace class).
+ *
+ * This context allows the visitor to evaluate a "field location".
+ *
+ * _current_trace_class is set the first time a trace class is visited and
+ * remains valid until the destruction of this object.
+ *
+ * _current_stream_class and _current_event_class are set only in the
+ * context of the visit of a stream class and of its event class(es).
+ */
+ const lttng::sessiond::trace::trace_class *_current_trace_class = nullptr;
+ const lttng::sessiond::trace::stream_class *_current_stream_class = nullptr;
+ const lttng::sessiond::trace::event_class *_current_event_class = nullptr;
};
} /* namespace tsdl */