sessiond: express field references as locations instead of names

[lttng-tools.git] / src / bin / lttng-sessiond / field.hpp

diff --git a/src/bin/lttng-sessiond/field.hpp b/src/bin/lttng-sessiond/field.hpp
index f353adafbcc7d04e04e056144d53bb3c269b1b73..2a1bcf35bf8002d5eec1a447fbe48b611d8eb345 100644 (file)
--- a/src/bin/lttng-sessiond/field.hpp
+++ b/src/bin/lttng-sessiond/field.hpp
@@ -27,6 +27,26 @@ enum class byte_order {
        LITTLE_ENDIAN_,
 };
 
+class field_location {
+public:
+       enum class root {
+               PACKET_HEADER,
+               PACKET_CONTEXT,
+               EVENT_RECORD_HEADER,
+               EVENT_RECORD_COMMON_CONTEXT,
+               EVENT_RECORD_SPECIFIC_CONTEXT,
+               EVENT_RECORD_PAYLOAD,
+       };
+
+       using elements = std::vector<std::string>;
+
+       field_location(root lookup_root, elements elements);
+       bool operator==(const field_location& other) const noexcept;
+
+       const root root_;
+       const elements elements_;
+};
+
 /*
  * Field, and the various field types, represents fields as exposed by the
  * LTTng tracers. These classes do not attempt to describe the complete spectrum of the CTF
@@ -277,11 +297,11 @@ class dynamic_length_array_type : public array_type {
 public:
        dynamic_length_array_type(unsigned int alignment,
                        type::cuptr element_type,
-                       std::string length_field_name);
+                       field_location length_field_location);
 
        virtual void accept(type_visitor& visitor) const override final;
 
-       const std::string length_field_name;
+       const field_location length_field_location;
 
 private:
        virtual bool _is_equal(const type& base_other) const noexcept override final;
@@ -309,11 +329,11 @@ private:
 
 class dynamic_length_blob_type : public type {
 public:
-       dynamic_length_blob_type(unsigned int alignment, std::string length_field_name);
+       dynamic_length_blob_type(unsigned int alignment, field_location length_field_location);
 
        virtual void accept(type_visitor& visitor) const override final;
 
-       const std::string length_field_name;
+       const field_location length_field_location;
 
 private:
        virtual bool _is_equal(const type& base_other) const noexcept override final;
@@ -355,10 +375,10 @@ class dynamic_length_string_type : public string_type {
 public:
        dynamic_length_string_type(unsigned int alignment,
                        enum encoding in_encoding,
-                       std::string length_field_name);
+                       field_location length_field_location);
        virtual void accept(type_visitor& visitor) const override final;
 
-       const std::string length_field_name;
+       const field_location length_field_location;
 
 private:
        virtual bool _is_equal(const type& base_other) const noexcept override final;
@@ -388,12 +408,15 @@ class variant_type : public type {
 public:
        using choices = std::vector<field::cuptr>;
 
-       variant_type(unsigned int alignment, std::string tag_name, choices in_choices);
+       variant_type(unsigned int alignment,
+                       field_location selector_field_location,
+                       choices in_choices);
 
        virtual void accept(type_visitor& visitor) const override final;
 
-       const std::string tag_name;
+       const field_location selector_field_location;
        const choices _choices;
+;
 
 private:
        virtual bool _is_equal(const type& base_other) const noexcept override final;