sessiond: field: add field roles and blob types

Extend the field/field type to include the blob field types that
are used to express the trace class uuid in CTF2.

Roles defined by the CTF2 specification are also added to allow a trace
class to define the layout of some scopes (e.g. packet header and
context) instead of hard-coding the serialized version of the layout
description.

The TSDL trace class visitor takes the new types into account by
converting them into arrays of "bytes" (uint8_t).

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ic9d976416ed765b157e951bf9b8b299abbe20e5b

diff --git a/src/bin/lttng-sessiond/field.cpp b/src/bin/lttng-sessiond/field.cpp
index 604092a3b86c9c5352a3ab3cd649f6ad77cc2312..d81cf02c736ccb9f061fdacdf1dcf33cc2ebd66b 100644 (file)
--- a/src/bin/lttng-sessiond/field.cpp
+++ b/src/bin/lttng-sessiond/field.cpp
@@ -70,12 +70,14 @@ lst::integer_type::integer_type(unsigned int in_alignment,
                enum lst::byte_order in_byte_order,
                unsigned int in_size,
                enum lst::integer_type::signedness in_signedness,
-               enum lst::integer_type::base in_base) :
+               enum lst::integer_type::base in_base,
+               roles in_roles) :
        type(in_alignment),
        byte_order{in_byte_order},
        size{in_size},
        signedness_{in_signedness},
-       base_{in_base}
+       base_{in_base},
+       roles_{std::move(in_roles)}
 {
 }
 
@@ -86,7 +88,8 @@ bool lst::integer_type::_is_equal(const type &base_other) const noexcept
        return this->byte_order == other.byte_order &&
                this->size == other.size &&
                this->signedness_ == other.signedness_ &&
-               this->base_ == other.base_;
+               this->base_ == other.base_ &&
+               this->roles_ == other.roles_;
 }
 
 void lst::integer_type::accept(type_visitor& visitor) const
@@ -148,8 +151,14 @@ lst::enumeration_type::enumeration_type(unsigned int in_alignment,
                enum lst::byte_order in_byte_order,
                unsigned int in_size,
                enum signedness in_signedness,
-               enum base in_base) :
-       integer_type(in_alignment, in_byte_order, in_size, in_signedness, in_base)
+               enum base in_base,
+               lst::integer_type::roles in_roles) :
+       integer_type(in_alignment,
+                       in_byte_order,
+                       in_size,
+                       in_signedness,
+                       in_base,
+                       std::move(in_roles))
 {
 }
 
@@ -224,6 +233,42 @@ void lst::dynamic_length_array_type::accept(type_visitor& visitor) const
        visitor.visit(*this);
 }
 
+lst::static_length_blob_type::static_length_blob_type(
+               unsigned int in_alignment, uint64_t in_length_bytes, roles in_roles) :
+       type(in_alignment), length_bytes{in_length_bytes}, roles_{std::move(in_roles)}
+{
+}
+
+bool lst::static_length_blob_type::_is_equal(const type& base_other) const noexcept
+{
+       const auto& other = static_cast<decltype(*this)&>(base_other);
+
+       return length_bytes == other.length_bytes && roles_ == other.roles_;
+}
+
+void lst::static_length_blob_type::accept(type_visitor& visitor) const
+{
+       visitor.visit(*this);
+}
+
+lst::dynamic_length_blob_type::dynamic_length_blob_type(
+               unsigned int in_alignment, std::string in_length_field_name) :
+       type(in_alignment), length_field_name{std::move(in_length_field_name)}
+{
+}
+
+bool lst::dynamic_length_blob_type::_is_equal(const type& base_other) const noexcept
+{
+       const auto& other = dynamic_cast<decltype(*this)&>(base_other);
+
+       return length_field_name == other.length_field_name;
+}
+
+void lst::dynamic_length_blob_type::accept(type_visitor& visitor) const
+{
+       visitor.visit(*this);
+}
+
 lst::string_type::string_type(unsigned int in_alignment, enum encoding in_encoding) :
        type(in_alignment), encoding_{in_encoding}
 {

diff --git a/src/bin/lttng-sessiond/field.hpp b/src/bin/lttng-sessiond/field.hpp
index f66fdbe7f440dc3c51a237c58fa75977002d84c6..79017416617efb22a168633cd1dec65a34559132 100644 (file)
--- a/src/bin/lttng-sessiond/field.hpp
+++ b/src/bin/lttng-sessiond/field.hpp
@@ -76,11 +76,30 @@ public:
                HEXADECIMAL = 16,
        };
 
+       enum class role {
+               DEFAULT_CLOCK_TIMESTAMP,
+               /* Packet header field class specific roles. */
+               DATA_STREAM_CLASS_ID,
+               DATA_STREAM_ID,
+               PACKET_MAGIC_NUMBER,
+               /* Packet context field class specific roles. */
+               DISCARDED_EVENT_RECORD_COUNTER_SNAPSHOT,
+               PACKET_CONTENT_LENGTH,
+               PACKET_END_DEFAULT_CLOCK_TIMESTAMP,
+               PACKET_SEQUENCE_NUMBER,
+               PACKET_TOTAL_LENGTH,
+               /* Event record field class roles. */
+               EVENT_RECORD_CLASS_ID,
+       };
+
+       using roles = std::vector<role>;
+
        integer_type(unsigned int alignment,
                        byte_order byte_order,
                        unsigned int size,
                        signedness signedness,
-                       base base);
+                       base base,
+                       roles roles = {});
 
        virtual void accept(type_visitor& visitor) const override;
 
@@ -93,6 +112,7 @@ public:
         */
        const signedness signedness_;
        const base base_;
+       const roles roles_;
 
 protected:
        virtual bool _is_equal(const type& other) const noexcept override;
@@ -121,7 +141,8 @@ protected:
                        enum byte_order byte_order,
                        unsigned int size,
                        enum signedness signedness,
-                       enum base base);
+                       enum base base,
+                       integer_type::roles roles = {});
 
        virtual void accept(type_visitor& visitor) const = 0;
 };
@@ -192,14 +213,17 @@ public:
        typed_enumeration_type(unsigned int in_alignment,
                        enum byte_order in_byte_order,
                        unsigned int in_size,
-                       enum signedness in_signedness,
                        enum base in_base,
-                       const std::shared_ptr<const mappings>& in_mappings) :
+                       const std::shared_ptr<const mappings>& in_mappings,
+                       integer_type::roles in_roles = {}) :
                enumeration_type(in_alignment,
                                in_byte_order,
                                in_size,
-                               in_signedness,
-                               in_base),
+                               std::is_signed<MappingIntegerType>::value ?
+                                               integer_type::signedness::SIGNED :
+                                                     integer_type::signedness::UNSIGNED,
+                               in_base,
+                               std::move(in_roles)),
                _mappings{std::move(in_mappings)}
        {
        }
@@ -260,6 +284,38 @@ private:
        virtual bool _is_equal(const type& base_other) const noexcept override final;
 };
 
+class static_length_blob_type : public type {
+public:
+       enum class role {
+               /* Packet header field class specific role. */
+               TRACE_CLASS_UUID,
+       };
+
+       using roles = std::vector<role>;
+
+       static_length_blob_type(unsigned int alignment, uint64_t in_length_bytes, roles roles = {});
+
+       virtual void accept(type_visitor& visitor) const override final;
+
+       const uint64_t length_bytes;
+       const roles roles_;
+
+private:
+       virtual bool _is_equal(const type& base_other) const noexcept override final;
+};
+
+class dynamic_length_blob_type : public type {
+public:
+       dynamic_length_blob_type(unsigned int alignment, std::string length_field_name);
+
+       virtual void accept(type_visitor& visitor) const override final;
+
+       const std::string length_field_name;
+
+private:
+       virtual bool _is_equal(const type& base_other) const noexcept override final;
+};
+
 class string_type : public type {
 public:
        enum class encoding {
@@ -358,6 +414,8 @@ public:
        virtual void visit(const unsigned_enumeration_type& type) = 0;
        virtual void visit(const static_length_array_type& type) = 0;
        virtual void visit(const dynamic_length_array_type& type) = 0;
+       virtual void visit(const static_length_blob_type& type) = 0;
+       virtual void visit(const dynamic_length_blob_type& type) = 0;
        virtual void visit(const null_terminated_string_type& type) = 0;
        virtual void visit(const static_length_string_type& type) = 0;
        virtual void visit(const dynamic_length_string_type& type) = 0;

diff --git a/src/bin/lttng-sessiond/tsdl-trace-class-visitor.cpp b/src/bin/lttng-sessiond/tsdl-trace-class-visitor.cpp
index 115d579763ff355330eef93379484a04fbc6c730..c6c9c93db7d3172a0ed3dd77a44b8578921f214d 100644 (file)
--- a/src/bin/lttng-sessiond/tsdl-trace-class-visitor.cpp
+++ b/src/bin/lttng-sessiond/tsdl-trace-class-visitor.cpp
@@ -300,6 +300,30 @@ private:
                                "[{}]", escape_tsdl_identifier(type.length_field_name)));
        }
 
+       virtual void visit(const lst::static_length_blob_type& type) override final
+       {
+               /* This type doesn't exist in CTF 1.x, express it as a static length array of uint8_t. */
+               std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(8,
+                               _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED,
+                               lst::integer_type::base::HEXADECIMAL);
+               const auto array = lttng::make_unique<lst::static_length_array_type>(
+                               type.alignment, std::move(uint8_element), type.length_bytes);
+
+               visit(*array);
+       }
+
+       virtual void visit(const lst::dynamic_length_blob_type& type) override final
+       {
+               /* This type doesn't exist in CTF 1.x, express it as a dynamic length array of uint8_t. */
+               std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(0,
+                               _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED,
+                               lst::integer_type::base::HEXADECIMAL);
+               const auto array = lttng::make_unique<lst::dynamic_length_array_type>(
+                               type.alignment, std::move(uint8_element), type.length_field_name);
+
+               visit(*array);
+       }
+
        virtual void visit(const lst::null_terminated_string_type& type) override final
        {
                /* Defaults to UTF-8.  */