2 * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
8 #ifndef LTTNG_TRACE_CLASS_H
9 #define LTTNG_TRACE_CLASS_H
13 #include <common/uuid.hpp>
22 class trace_class_visitor;
25 unsigned int bits_per_long;
26 unsigned int long_alignment;
27 unsigned int uint8_t_alignment;
28 unsigned int uint16_t_alignment;
29 unsigned int uint32_t_alignment;
30 unsigned int uint64_t_alignment;
31 enum byte_order byte_order;
34 template <class ValueType>
35 class environment_field {
37 environment_field(const char *in_name, const ValueType& in_value) :
38 name(in_name), value(in_value)
42 const char * const name;
43 const ValueType& value;
49 * Derived classes must implement the _accept_on_*()
50 * to continue the traversal to the trace class' children.
52 virtual void accept(trace_class_visitor& trace_class_visitor) const;
53 virtual const lttng::sessiond::trace::type *get_packet_header() const noexcept = 0;
55 virtual ~trace_class() = default;
58 const lttng_uuid uuid;
61 trace_class(const struct abi& abi, const lttng_uuid& trace_uuid);
62 virtual void _accept_on_clock_classes(trace_class_visitor& trace_class_visitor) const = 0;
63 virtual void _visit_environment(trace_class_visitor& trace_class_visitor) const = 0;
64 virtual void _accept_on_stream_classes(trace_class_visitor& trace_class_visitor) const = 0;
67 class trace_class_visitor {
69 using cuptr = std::unique_ptr<trace_class_visitor>;
71 virtual ~trace_class_visitor() = default;
73 /* trace class visitor interface. */
74 virtual void visit(const lttng::sessiond::trace::trace_class& trace_class) = 0;
76 /* clock class visitor interface. */
77 virtual void visit(const lttng::sessiond::trace::clock_class& clock_class) = 0;
79 /* environment visitor interface. */
80 virtual void environment_begin() = 0;
81 virtual void visit(const environment_field<int64_t>& field) = 0;
82 virtual void visit(const environment_field<const char *>& field) = 0;
83 void visit(const environment_field<std::string>& field);
84 virtual void environment_end() = 0;
86 /* stream class visitor interface. */
87 virtual void visit(const lttng::sessiond::trace::stream_class& stream_class) = 0;
89 /* event class visitor interface. */
90 virtual void visit(const lttng::sessiond::trace::event_class& event_class) = 0;
93 } /* namespace trace */
94 } /* namespace sessiond */
95 } /* namespace lttng */
97 #endif /* LTTNG_TRACE_CLASS_H */