| 1 | /* |
| 2 | * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include "tsdl-trace-class-visitor.hpp" |
| 9 | #include "clock-class.hpp" |
| 10 | |
| 11 | #include <common/exception.hpp> |
| 12 | #include <common/format.hpp> |
| 13 | #include <common/make-unique.hpp> |
| 14 | #include <common/uuid.hpp> |
| 15 | |
| 16 | #include <vendor/optional.hpp> |
| 17 | |
| 18 | #include <algorithm> |
| 19 | #include <array> |
| 20 | #include <locale> |
| 21 | #include <queue> |
| 22 | #include <set> |
| 23 | #include <stack> |
| 24 | |
| 25 | namespace lst = lttng::sessiond::trace; |
| 26 | namespace tsdl = lttng::sessiond::tsdl; |
| 27 | |
| 28 | namespace { |
| 29 | const auto ctf_spec_major = 1; |
| 30 | const auto ctf_spec_minor = 8; |
| 31 | |
| 32 | /* |
| 33 | * Although the CTF v1.8 specification recommends ignoring any leading underscore, Some readers, |
| 34 | * such as Babeltrace 1.x, expect special identifiers without a prepended underscore. |
| 35 | */ |
| 36 | const std::set<std::string> safe_tsdl_identifiers = { |
| 37 | "stream_id", |
| 38 | "packet_size", |
| 39 | "content_size", |
| 40 | "id", |
| 41 | "v", |
| 42 | "timestamp", |
| 43 | "events_discarded", |
| 44 | "packet_seq_num", |
| 45 | "timestamp_begin", |
| 46 | "timestamp_end", |
| 47 | "cpu_id", |
| 48 | "magic", |
| 49 | "uuid", |
| 50 | "stream_instance_id" |
| 51 | }; |
| 52 | |
| 53 | /* |
| 54 | * A previous implementation always prepended '_' to the identifiers in order to |
| 55 | * side-step the problem of escaping TSDL keywords and ensuring identifiers |
| 56 | * started with an alphabetic character. |
| 57 | * |
| 58 | * Changing this behaviour to a smarter algorithm would break readers that have |
| 59 | * come to expect this initial underscore. |
| 60 | */ |
| 61 | std::string escape_tsdl_identifier(const std::string& original_identifier) |
| 62 | { |
| 63 | if (original_identifier.size() == 0) { |
| 64 | LTTNG_THROW_ERROR("Invalid 0-length identifier used in trace description"); |
| 65 | } |
| 66 | |
| 67 | if (safe_tsdl_identifiers.find(original_identifier) != safe_tsdl_identifiers.end()) { |
| 68 | return original_identifier; |
| 69 | } |
| 70 | |
| 71 | std::string new_identifier; |
| 72 | /* Optimisticly assume most identifiers are valid and allocate the same length. */ |
| 73 | new_identifier.reserve(original_identifier.size()); |
| 74 | new_identifier = "_"; |
| 75 | |
| 76 | /* Replace illegal characters by '_'. */ |
| 77 | std::locale c_locale{"C"}; |
| 78 | for (const auto current_char : original_identifier) { |
| 79 | if (!std::isalnum(current_char, c_locale) && current_char != '_') { |
| 80 | new_identifier += '_'; |
| 81 | } else { |
| 82 | new_identifier += current_char; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | return new_identifier; |
| 87 | } |
| 88 | |
| 89 | std::string escape_tsdl_env_string_value(const std::string& original_string) |
| 90 | { |
| 91 | std::string escaped_string; |
| 92 | |
| 93 | escaped_string.reserve(original_string.size()); |
| 94 | |
| 95 | for (const auto c : original_string) { |
| 96 | switch (c) { |
| 97 | case '\n': |
| 98 | escaped_string += "\\n"; |
| 99 | break; |
| 100 | case '\\': |
| 101 | escaped_string += "\\\\"; |
| 102 | break; |
| 103 | case '"': |
| 104 | escaped_string += "\""; |
| 105 | break; |
| 106 | default: |
| 107 | escaped_string += c; |
| 108 | break; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | return escaped_string; |
| 113 | } |
| 114 | |
| 115 | class tsdl_field_visitor : public lttng::sessiond::trace::field_visitor, |
| 116 | public lttng::sessiond::trace::type_visitor { |
| 117 | public: |
| 118 | tsdl_field_visitor(const lst::abi& abi, |
| 119 | unsigned int indentation_level, |
| 120 | const nonstd::optional<std::string>& in_default_clock_class_name = |
| 121 | nonstd::nullopt) : |
| 122 | _indentation_level{indentation_level}, |
| 123 | _trace_abi{abi}, |
| 124 | _bypass_identifier_escape{false}, |
| 125 | _default_clock_class_name{in_default_clock_class_name ? |
| 126 | in_default_clock_class_name->c_str() : |
| 127 | nullptr} |
| 128 | { |
| 129 | } |
| 130 | |
| 131 | /* Only call once. */ |
| 132 | std::string transfer_description() |
| 133 | { |
| 134 | return std::move(_description); |
| 135 | } |
| 136 | |
| 137 | private: |
| 138 | virtual void visit(const lst::field& field) override final |
| 139 | { |
| 140 | /* |
| 141 | * Hack: keep the name of the field being visited since |
| 142 | * the tracers can express sequences, variants, and arrays with an alignment |
| 143 | * constraint, which is not expressible in TSDL. To work around this limitation, an |
| 144 | * empty structure declaration is inserted when needed to express the aligment |
| 145 | * constraint. The name of this structure is generated using the field's name. |
| 146 | */ |
| 147 | _current_field_name.push(_bypass_identifier_escape ? |
| 148 | field.name : escape_tsdl_identifier(field.name)); |
| 149 | |
| 150 | field.get_type().accept(*this); |
| 151 | _description += " "; |
| 152 | _description += _current_field_name.top(); |
| 153 | _current_field_name.pop(); |
| 154 | |
| 155 | /* |
| 156 | * Some types requires suffixes to be appended (e.g. the length of arrays |
| 157 | * and sequences, the mappings of enumerations). |
| 158 | */ |
| 159 | while (!_type_suffixes.empty()) { |
| 160 | _description += _type_suffixes.front(); |
| 161 | _type_suffixes.pop(); |
| 162 | } |
| 163 | |
| 164 | _description += ";"; |
| 165 | } |
| 166 | |
| 167 | virtual void visit(const lst::integer_type& type) override final |
| 168 | { |
| 169 | _description += "integer { "; |
| 170 | |
| 171 | /* Mandatory properties (no defaults). */ |
| 172 | _description += fmt::format("size = {size}; align = {alignment};", |
| 173 | fmt::arg("size", type.size), |
| 174 | fmt::arg("alignment", type.alignment)); |
| 175 | |
| 176 | /* Defaults to unsigned. */ |
| 177 | if (type.signedness_ == lst::integer_type::signedness::SIGNED) { |
| 178 | _description += " signed = true;"; |
| 179 | } |
| 180 | |
| 181 | /* Defaults to 10. */ |
| 182 | if (type.base_ != lst::integer_type::base::DECIMAL) { |
| 183 | unsigned int base; |
| 184 | |
| 185 | switch (type.base_) { |
| 186 | case lst::integer_type::base::BINARY: |
| 187 | base = 2; |
| 188 | break; |
| 189 | case lst::integer_type::base::OCTAL: |
| 190 | base = 8; |
| 191 | break; |
| 192 | case lst::integer_type::base::HEXADECIMAL: |
| 193 | base = 16; |
| 194 | break; |
| 195 | default: |
| 196 | LTTNG_THROW_ERROR(fmt::format( |
| 197 | "Unexpected base encountered while serializing integer type to TSDL: base = {}", |
| 198 | (int) type.base_)); |
| 199 | } |
| 200 | |
| 201 | _description += fmt::format(" base = {};", base); |
| 202 | } |
| 203 | |
| 204 | /* Defaults to the trace's native byte order. */ |
| 205 | if (type.byte_order != _trace_abi.byte_order) { |
| 206 | const auto byte_order_str = type.byte_order == lst::byte_order::BIG_ENDIAN_ ? "be" : "le"; |
| 207 | |
| 208 | _description += fmt::format(" byte_order = {};", byte_order_str); |
| 209 | } |
| 210 | |
| 211 | if (_current_integer_encoding_override) { |
| 212 | const char *encoding_str; |
| 213 | |
| 214 | switch (*_current_integer_encoding_override) { |
| 215 | case lst::string_type::encoding::ASCII: |
| 216 | encoding_str = "ASCII"; |
| 217 | break; |
| 218 | case lst::string_type::encoding::UTF8: |
| 219 | encoding_str = "UTF8"; |
| 220 | break; |
| 221 | default: |
| 222 | LTTNG_THROW_ERROR(fmt::format( |
| 223 | "Unexpected encoding encountered while serializing integer type to TSDL: encoding = {}", |
| 224 | (int) *_current_integer_encoding_override)); |
| 225 | } |
| 226 | |
| 227 | _description += fmt::format(" encoding = {};", encoding_str); |
| 228 | _current_integer_encoding_override.reset(); |
| 229 | } |
| 230 | |
| 231 | if (std::find(type.roles_.begin(), type.roles_.end(), |
| 232 | lst::integer_type::role::DEFAULT_CLOCK_TIMESTAMP) != |
| 233 | type.roles_.end() || |
| 234 | std::find(type.roles_.begin(), type.roles_.end(), |
| 235 | lst::integer_type::role:: |
| 236 | PACKET_END_DEFAULT_CLOCK_TIMESTAMP) != |
| 237 | type.roles_.end()) { |
| 238 | LTTNG_ASSERT(_default_clock_class_name); |
| 239 | _description += fmt::format( |
| 240 | " map = clock.{}.value;", _default_clock_class_name); |
| 241 | } |
| 242 | |
| 243 | _description += " }"; |
| 244 | } |
| 245 | |
| 246 | virtual void visit(const lst::floating_point_type& type) override final |
| 247 | { |
| 248 | _description += fmt::format( |
| 249 | "floating_point {{ align = {alignment}; mant_dig = {mantissa_digits}; exp_dig = {exponent_digits};", |
| 250 | fmt::arg("alignment", type.alignment), |
| 251 | fmt::arg("mantissa_digits", type.mantissa_digits), |
| 252 | fmt::arg("exponent_digits", type.exponent_digits)); |
| 253 | |
| 254 | /* Defaults to the trace's native byte order. */ |
| 255 | if (type.byte_order != _trace_abi.byte_order) { |
| 256 | const auto byte_order_str = type.byte_order == lst::byte_order::BIG_ENDIAN_ ? "be" : "le"; |
| 257 | |
| 258 | _description += fmt::format(" byte_order = {};", byte_order_str); |
| 259 | } |
| 260 | |
| 261 | _description += " }"; |
| 262 | } |
| 263 | |
| 264 | template <class EnumerationType> |
| 265 | void visit_enumeration(const EnumerationType& type) |
| 266 | { |
| 267 | /* name follows, when applicable. */ |
| 268 | _description += "enum : "; |
| 269 | |
| 270 | tsdl_field_visitor integer_visitor{_trace_abi, _indentation_level}; |
| 271 | |
| 272 | integer_visitor.visit(static_cast<const lst::integer_type&>(type)); |
| 273 | _description += integer_visitor.transfer_description() + " {\n"; |
| 274 | |
| 275 | const auto mappings_indentation_level = _indentation_level + 1; |
| 276 | |
| 277 | bool first_mapping = true; |
| 278 | for (const auto& mapping : *type.mappings_) { |
| 279 | if (!first_mapping) { |
| 280 | _description += ",\n"; |
| 281 | } |
| 282 | |
| 283 | _description.resize(_description.size() + mappings_indentation_level, '\t'); |
| 284 | if (mapping.range.begin == mapping.range.end) { |
| 285 | _description += fmt::format( |
| 286 | "\"{mapping_name}\" = {mapping_value}", |
| 287 | fmt::arg("mapping_name", mapping.name), |
| 288 | fmt::arg("mapping_value", mapping.range.begin)); |
| 289 | } else { |
| 290 | _description += fmt::format( |
| 291 | "\"{mapping_name}\" = {mapping_range_begin} ... {mapping_range_end}", |
| 292 | fmt::arg("mapping_name", mapping.name), |
| 293 | fmt::arg("mapping_range_begin", |
| 294 | mapping.range.begin), |
| 295 | fmt::arg("mapping_range_end", mapping.range.end)); |
| 296 | } |
| 297 | |
| 298 | first_mapping = false; |
| 299 | } |
| 300 | |
| 301 | _description += "\n"; |
| 302 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 303 | _description += "}"; |
| 304 | } |
| 305 | |
| 306 | virtual void visit(const lst::signed_enumeration_type& type) override final |
| 307 | { |
| 308 | visit_enumeration(type); |
| 309 | } |
| 310 | |
| 311 | virtual void visit(const lst::unsigned_enumeration_type& type) override final |
| 312 | { |
| 313 | visit_enumeration(type); |
| 314 | } |
| 315 | |
| 316 | virtual void visit(const lst::static_length_array_type& type) override final |
| 317 | { |
| 318 | if (type.alignment != 0) { |
| 319 | LTTNG_ASSERT(_current_field_name.size() > 0); |
| 320 | _description += fmt::format( |
| 321 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 322 | fmt::arg("alignment", type.alignment), |
| 323 | fmt::arg("field_name", _current_field_name.top())); |
| 324 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 325 | } |
| 326 | |
| 327 | type.element_type->accept(*this); |
| 328 | _type_suffixes.emplace(fmt::format("[{}]", type.length)); |
| 329 | } |
| 330 | |
| 331 | virtual void visit(const lst::dynamic_length_array_type& type) override final |
| 332 | { |
| 333 | if (type.alignment != 0) { |
| 334 | /* |
| 335 | * Note that this doesn't support nested sequences. For |
| 336 | * the moment, tracers can't express those. However, we |
| 337 | * could wrap nested sequences in structures, which |
| 338 | * would allow us to express alignment constraints. |
| 339 | */ |
| 340 | LTTNG_ASSERT(_current_field_name.size() > 0); |
| 341 | _description += fmt::format( |
| 342 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 343 | fmt::arg("alignment", type.alignment), |
| 344 | fmt::arg("field_name", _current_field_name.top())); |
| 345 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 346 | } |
| 347 | |
| 348 | type.element_type->accept(*this); |
| 349 | _type_suffixes.emplace(fmt::format("[{}]", |
| 350 | _bypass_identifier_escape ? |
| 351 | *(type.length_field_location.elements_.end() - 1) : |
| 352 | escape_tsdl_identifier(*(type.length_field_location.elements_.end() - 1)))); |
| 353 | } |
| 354 | |
| 355 | virtual void visit(const lst::static_length_blob_type& type) override final |
| 356 | { |
| 357 | /* This type doesn't exist in CTF 1.x, express it as a static length array of uint8_t. */ |
| 358 | std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(8, |
| 359 | _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED, |
| 360 | lst::integer_type::base::HEXADECIMAL); |
| 361 | const auto array = lttng::make_unique<lst::static_length_array_type>( |
| 362 | type.alignment, std::move(uint8_element), type.length_bytes); |
| 363 | |
| 364 | visit(*array); |
| 365 | } |
| 366 | |
| 367 | virtual void visit(const lst::dynamic_length_blob_type& type) override final |
| 368 | { |
| 369 | /* This type doesn't exist in CTF 1.x, express it as a dynamic length array of uint8_t. */ |
| 370 | std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(0, |
| 371 | _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED, |
| 372 | lst::integer_type::base::HEXADECIMAL); |
| 373 | const auto array = lttng::make_unique<lst::dynamic_length_array_type>( |
| 374 | type.alignment, std::move(uint8_element), type.length_field_location); |
| 375 | |
| 376 | visit(*array); |
| 377 | } |
| 378 | |
| 379 | virtual void visit(const lst::null_terminated_string_type& type) override final |
| 380 | { |
| 381 | /* Defaults to UTF-8. */ |
| 382 | if (type.encoding_ == lst::null_terminated_string_type::encoding::ASCII) { |
| 383 | _description += "string { encoding = ASCII }"; |
| 384 | } else { |
| 385 | _description += "string"; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | virtual void visit(const lst::structure_type& type) override final |
| 390 | { |
| 391 | _indentation_level++; |
| 392 | _description += "struct {"; |
| 393 | |
| 394 | const auto previous_bypass_identifier_escape = _bypass_identifier_escape; |
| 395 | _bypass_identifier_escape = false; |
| 396 | for (const auto& field : type.fields_) { |
| 397 | _description += "\n"; |
| 398 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 399 | field->accept(*this); |
| 400 | } |
| 401 | |
| 402 | _bypass_identifier_escape = previous_bypass_identifier_escape; |
| 403 | |
| 404 | _indentation_level--; |
| 405 | if (type.fields_.size() != 0) { |
| 406 | _description += "\n"; |
| 407 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 408 | } |
| 409 | |
| 410 | _description += "}"; |
| 411 | } |
| 412 | |
| 413 | template <class MappingIntegerType> |
| 414 | void visit_variant(const lst::variant_type<MappingIntegerType>& type) |
| 415 | { |
| 416 | if (type.alignment != 0) { |
| 417 | LTTNG_ASSERT(_current_field_name.size() > 0); |
| 418 | _description += fmt::format( |
| 419 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 420 | fmt::arg("alignment", type.alignment), |
| 421 | fmt::arg("field_name", _current_field_name.top())); |
| 422 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 423 | } |
| 424 | |
| 425 | _indentation_level++; |
| 426 | _description += fmt::format("variant <{}> {{\n", |
| 427 | _bypass_identifier_escape ? |
| 428 | *(type.selector_field_location.elements_.end() - 1) : |
| 429 | escape_tsdl_identifier(*(type.selector_field_location.elements_.end() - 1))); |
| 430 | |
| 431 | /* |
| 432 | * The CTF 1.8 specification only recommends that implementations ignore |
| 433 | * leading underscores in field names. Both babeltrace 1 and 2 expect the |
| 434 | * variant choice and enumeration mapping name to match perfectly. Given that we |
| 435 | * don't have access to the tag in this context, we have to assume they match. |
| 436 | */ |
| 437 | const auto previous_bypass_identifier_escape = _bypass_identifier_escape; |
| 438 | _bypass_identifier_escape = true; |
| 439 | for (const auto& field : type.choices_) { |
| 440 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 441 | field.second->accept(*this); |
| 442 | _description += fmt::format(" {};\n", field.first.name); |
| 443 | } |
| 444 | |
| 445 | _bypass_identifier_escape = previous_bypass_identifier_escape; |
| 446 | |
| 447 | _indentation_level--; |
| 448 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 449 | _description += "}"; |
| 450 | } |
| 451 | |
| 452 | virtual void visit(const lst::variant_type<lst::signed_enumeration_type::mapping::range_t::range_integer_t>& type) override final |
| 453 | { |
| 454 | visit_variant(type); |
| 455 | } |
| 456 | |
| 457 | virtual void visit(const lst::variant_type<lst::unsigned_enumeration_type::mapping::range_t::range_integer_t>& type) override final |
| 458 | { |
| 459 | visit_variant(type); |
| 460 | } |
| 461 | |
| 462 | lst::type::cuptr create_character_type(enum lst::string_type::encoding encoding) |
| 463 | { |
| 464 | _current_integer_encoding_override = encoding; |
| 465 | return lttng::make_unique<lst::integer_type>(8, _trace_abi.byte_order, 8, |
| 466 | lst::integer_type::signedness::UNSIGNED, |
| 467 | lst::integer_type::base::DECIMAL); |
| 468 | } |
| 469 | |
| 470 | virtual void visit(const lst::static_length_string_type& type) override final |
| 471 | { |
| 472 | /* |
| 473 | * TSDL expresses static-length strings as arrays of 8-bit integer with |
| 474 | * an encoding specified. |
| 475 | */ |
| 476 | const auto char_array = lttng::make_unique<lst::static_length_array_type>( |
| 477 | type.alignment, create_character_type(type.encoding_), type.length); |
| 478 | |
| 479 | visit(*char_array); |
| 480 | } |
| 481 | |
| 482 | virtual void visit(const lst::dynamic_length_string_type& type) override final |
| 483 | { |
| 484 | /* |
| 485 | * TSDL expresses dynamic-length strings as arrays of 8-bit integer with |
| 486 | * an encoding specified. |
| 487 | */ |
| 488 | const auto char_sequence = lttng::make_unique<lst::dynamic_length_array_type>( |
| 489 | type.alignment, create_character_type(type.encoding_), |
| 490 | type.length_field_location); |
| 491 | |
| 492 | visit(*char_sequence); |
| 493 | } |
| 494 | |
| 495 | std::stack<std::string> _current_field_name; |
| 496 | /* |
| 497 | * Encoding to specify for the next serialized integer type. |
| 498 | * Since the integer_type does not allow an encoding to be specified (it is a TSDL-specific |
| 499 | * concept), this attribute is used when expressing static or dynamic length strings as |
| 500 | * arrays/sequences of bytes with an encoding. |
| 501 | */ |
| 502 | nonstd::optional<enum lst::string_type::encoding> _current_integer_encoding_override; |
| 503 | |
| 504 | unsigned int _indentation_level; |
| 505 | const lst::abi& _trace_abi; |
| 506 | |
| 507 | std::queue<std::string> _type_suffixes; |
| 508 | |
| 509 | /* Description in TSDL format. */ |
| 510 | std::string _description; |
| 511 | |
| 512 | bool _bypass_identifier_escape; |
| 513 | const char *_default_clock_class_name; |
| 514 | }; |
| 515 | |
| 516 | class tsdl_trace_environment_visitor : public lst::trace_class_environment_visitor { |
| 517 | public: |
| 518 | tsdl_trace_environment_visitor() : _environment{"env {\n"} |
| 519 | { |
| 520 | } |
| 521 | |
| 522 | virtual void visit(const lst::environment_field<int64_t>& field) override |
| 523 | { |
| 524 | _environment += fmt::format(" {} = {};\n", field.name, field.value); |
| 525 | } |
| 526 | |
| 527 | virtual void visit(const lst::environment_field<const char *>& field) override |
| 528 | { |
| 529 | _environment += fmt::format(" {} = \"{}\";\n", field.name, |
| 530 | escape_tsdl_env_string_value(field.value)); |
| 531 | } |
| 532 | |
| 533 | /* Only call once. */ |
| 534 | std::string transfer_description() |
| 535 | { |
| 536 | _environment += "};\n\n"; |
| 537 | return std::move(_environment); |
| 538 | } |
| 539 | |
| 540 | private: |
| 541 | std::string _environment; |
| 542 | }; |
| 543 | } /* namespace */ |
| 544 | |
| 545 | tsdl::trace_class_visitor::trace_class_visitor(const lst::abi& trace_abi, |
| 546 | tsdl::append_metadata_fragment_function append_metadata_fragment) : |
| 547 | _trace_abi{trace_abi}, |
| 548 | _append_metadata_fragment(append_metadata_fragment) |
| 549 | { |
| 550 | } |
| 551 | |
| 552 | void tsdl::trace_class_visitor::append_metadata_fragment(const std::string& fragment) const |
| 553 | { |
| 554 | _append_metadata_fragment(fragment); |
| 555 | } |
| 556 | |
| 557 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::trace_class& trace_class) |
| 558 | { |
| 559 | tsdl_field_visitor packet_header_visitor(trace_class.abi, 1); |
| 560 | |
| 561 | trace_class.get_packet_header()->accept(packet_header_visitor); |
| 562 | |
| 563 | /* Declare type aliases, trace class, and packet header. */ |
| 564 | auto trace_class_tsdl = fmt::format( |
| 565 | "/* CTF {ctf_major}.{ctf_minor} */\n\n" |
| 566 | "trace {{\n" |
| 567 | " major = {ctf_major};\n" |
| 568 | " minor = {ctf_minor};\n" |
| 569 | " uuid = \"{uuid}\";\n" |
| 570 | " byte_order = {byte_order};\n" |
| 571 | " packet.header := {packet_header_layout};\n" |
| 572 | "}};\n\n", |
| 573 | fmt::arg("ctf_major", ctf_spec_major), |
| 574 | fmt::arg("ctf_minor", ctf_spec_minor), |
| 575 | fmt::arg("uint8_t_alignment", trace_class.abi.uint8_t_alignment), |
| 576 | fmt::arg("uint16_t_alignment", trace_class.abi.uint16_t_alignment), |
| 577 | fmt::arg("uint32_t_alignment", trace_class.abi.uint32_t_alignment), |
| 578 | fmt::arg("uint64_t_alignment", trace_class.abi.uint64_t_alignment), |
| 579 | fmt::arg("long_alignment", trace_class.abi.long_alignment), |
| 580 | fmt::arg("long_size", trace_class.abi.long_alignment), |
| 581 | fmt::arg("bits_per_long", trace_class.abi.bits_per_long), |
| 582 | fmt::arg("uuid", lttng::utils::uuid_to_str(trace_class.uuid)), |
| 583 | fmt::arg("byte_order", |
| 584 | trace_class.abi.byte_order == lst::byte_order::BIG_ENDIAN_ ? "be" : "le"), |
| 585 | fmt::arg("packet_header_layout", packet_header_visitor.transfer_description())); |
| 586 | |
| 587 | /* Declare trace scope and type aliases. */ |
| 588 | append_metadata_fragment(trace_class_tsdl); |
| 589 | |
| 590 | tsdl_trace_environment_visitor environment_visitor; |
| 591 | trace_class.accept(environment_visitor); |
| 592 | append_metadata_fragment(environment_visitor.transfer_description()); |
| 593 | } |
| 594 | |
| 595 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::clock_class& clock_class) |
| 596 | { |
| 597 | auto uuid_str = clock_class.uuid ? |
| 598 | fmt::format(" uuid = \"{}\";\n", |
| 599 | lttng::utils::uuid_to_str(*clock_class.uuid)) : |
| 600 | ""; |
| 601 | |
| 602 | /* Assumes a single clock that maps to specific stream class fields/roles. */ |
| 603 | auto clock_class_str = fmt::format( |
| 604 | "clock {{\n" |
| 605 | " name = \"{name}\";\n" |
| 606 | /* Optional uuid. */ |
| 607 | "{uuid}" |
| 608 | " description = \"{description}\";\n" |
| 609 | " freq = {frequency};\n" |
| 610 | " offset = {offset};\n" |
| 611 | "}};\n" |
| 612 | "\n", |
| 613 | fmt::arg("name", clock_class.name), |
| 614 | fmt::arg("uuid", uuid_str), |
| 615 | fmt::arg("description", clock_class.description), |
| 616 | fmt::arg("frequency", clock_class.frequency), |
| 617 | fmt::arg("offset", clock_class.offset)); |
| 618 | |
| 619 | append_metadata_fragment(clock_class_str); |
| 620 | } |
| 621 | |
| 622 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::stream_class& stream_class) |
| 623 | { |
| 624 | auto stream_class_str = fmt::format("stream {{\n" |
| 625 | " id = {};\n", stream_class.id); |
| 626 | |
| 627 | const auto *event_header = stream_class.get_event_header(); |
| 628 | if (event_header) { |
| 629 | auto event_header_visitor = tsdl_field_visitor( |
| 630 | _trace_abi, 1, stream_class.default_clock_class_name); |
| 631 | |
| 632 | event_header->accept(event_header_visitor); |
| 633 | stream_class_str += fmt::format(" event.header := {};\n", |
| 634 | event_header_visitor.transfer_description()); |
| 635 | } |
| 636 | |
| 637 | const auto *packet_context = stream_class.get_packet_context(); |
| 638 | if (packet_context) { |
| 639 | auto packet_context_visitor = tsdl_field_visitor( |
| 640 | _trace_abi, 1, stream_class.default_clock_class_name); |
| 641 | |
| 642 | packet_context->accept(packet_context_visitor); |
| 643 | stream_class_str += fmt::format(" packet.context := {};\n", |
| 644 | packet_context_visitor.transfer_description()); |
| 645 | } |
| 646 | |
| 647 | const auto *event_context = stream_class.get_event_context(); |
| 648 | if (event_context) { |
| 649 | auto event_context_visitor = tsdl_field_visitor(_trace_abi, 1); |
| 650 | |
| 651 | event_context->accept(event_context_visitor); |
| 652 | stream_class_str += fmt::format(" event.context := {};\n", |
| 653 | event_context_visitor.transfer_description()); |
| 654 | } |
| 655 | |
| 656 | stream_class_str += "};\n\n"; |
| 657 | |
| 658 | append_metadata_fragment(stream_class_str); |
| 659 | } |
| 660 | |
| 661 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::event_class& event_class) |
| 662 | { |
| 663 | auto event_class_str = fmt::format("event {{\n" |
| 664 | " name = \"{name}\";\n" |
| 665 | " id = {id};\n" |
| 666 | " stream_id = {stream_class_id};\n" |
| 667 | " loglevel = {log_level};\n", |
| 668 | fmt::arg("name", event_class.name), |
| 669 | fmt::arg("id", event_class.id), |
| 670 | fmt::arg("stream_class_id", event_class.stream_class_id), |
| 671 | fmt::arg("log_level", event_class.log_level)); |
| 672 | |
| 673 | if (event_class.model_emf_uri) { |
| 674 | event_class_str += fmt::format( |
| 675 | " model.emf.uri = \"{}\";\n", *event_class.model_emf_uri); |
| 676 | } |
| 677 | |
| 678 | auto payload_visitor = tsdl_field_visitor(_trace_abi, 1); |
| 679 | |
| 680 | event_class.payload->accept(static_cast<lst::type_visitor&>(payload_visitor)); |
| 681 | |
| 682 | event_class_str += fmt::format( |
| 683 | " fields := {};\n}};\n\n", payload_visitor.transfer_description()); |
| 684 | |
| 685 | append_metadata_fragment(event_class_str); |
| 686 | } |