| 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 "clock-class.hpp" |
| 9 | #include "tsdl-trace-class-visitor.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 <array> |
| 17 | #include <queue> |
| 18 | #include <locale> |
| 19 | |
| 20 | namespace lst = lttng::sessiond::trace; |
| 21 | namespace tsdl = lttng::sessiond::tsdl; |
| 22 | |
| 23 | namespace { |
| 24 | const auto ctf_spec_major = 1; |
| 25 | const auto ctf_spec_minor = 8; |
| 26 | |
| 27 | /* |
| 28 | * A previous implementation always prepended '_' to the identifiers in order to |
| 29 | * side-step the problem of escaping TSDL keywords and ensuring identifiers |
| 30 | * started with an alphabetic character. |
| 31 | * |
| 32 | * Changing this behaviour to a smarter algorithm would break readers that have |
| 33 | * come to expect this initial underscore. |
| 34 | */ |
| 35 | std::string escape_tsdl_identifier(const std::string& original_identifier) |
| 36 | { |
| 37 | if (original_identifier.size() == 0) { |
| 38 | LTTNG_THROW_ERROR("Invalid 0-length identifier used in trace description"); |
| 39 | } |
| 40 | |
| 41 | std::string new_identifier; |
| 42 | /* Optimisticly assume most identifiers are valid and allocate the same length. */ |
| 43 | new_identifier.reserve(original_identifier.size()); |
| 44 | new_identifier = "_"; |
| 45 | |
| 46 | /* Replace illegal characters by '_'. */ |
| 47 | std::locale c_locale{"C"}; |
| 48 | for (const auto current_char : original_identifier) { |
| 49 | if (!std::isalnum(current_char, c_locale) && current_char != '_') { |
| 50 | new_identifier += '_'; |
| 51 | } else { |
| 52 | new_identifier += current_char; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | return new_identifier; |
| 57 | } |
| 58 | |
| 59 | std::string escape_tsdl_env_string_value(const std::string& original_string) |
| 60 | { |
| 61 | std::string escaped_string; |
| 62 | |
| 63 | escaped_string.reserve(original_string.size()); |
| 64 | |
| 65 | for (const auto c : original_string) { |
| 66 | switch (c) { |
| 67 | case '\n': |
| 68 | escaped_string += "\\n"; |
| 69 | break; |
| 70 | case '\\': |
| 71 | escaped_string += "\\\\"; |
| 72 | break; |
| 73 | case '"': |
| 74 | escaped_string += "\""; |
| 75 | break; |
| 76 | default: |
| 77 | escaped_string += c; |
| 78 | break; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | return escaped_string; |
| 83 | } |
| 84 | |
| 85 | class tsdl_field_visitor : public lttng::sessiond::trace::field_visitor, |
| 86 | public lttng::sessiond::trace::type_visitor { |
| 87 | public: |
| 88 | tsdl_field_visitor(const lst::abi& abi, unsigned int indentation_level) : |
| 89 | _indentation_level{indentation_level}, _trace_abi{abi} |
| 90 | { |
| 91 | } |
| 92 | |
| 93 | std::string& get_description() |
| 94 | { |
| 95 | return _description; |
| 96 | } |
| 97 | |
| 98 | private: |
| 99 | virtual void visit(const lst::field& field) override final |
| 100 | { |
| 101 | /* |
| 102 | * Hack: keep the name of the field being visited since |
| 103 | * the tracers can express sequences, variants, and arrays with an alignment |
| 104 | * constraint, which is not expressible in TSDL. To work around this limitation, an |
| 105 | * empty structure declaration is inserted when needed to express the aligment |
| 106 | * constraint. The name of this structure is generated using the field's name. |
| 107 | */ |
| 108 | _escaped_current_field_name = escape_tsdl_identifier(field.name); |
| 109 | |
| 110 | field._type->accept(*this); |
| 111 | _description += " "; |
| 112 | _description += _escaped_current_field_name; |
| 113 | |
| 114 | /* |
| 115 | * Some types requires suffixes to be appended (e.g. the length of arrays |
| 116 | * and sequences, the mappings of enumerations). |
| 117 | */ |
| 118 | while (!_type_suffixes.empty()) { |
| 119 | _description += _type_suffixes.front(); |
| 120 | _type_suffixes.pop(); |
| 121 | } |
| 122 | |
| 123 | _description += ";"; |
| 124 | _escaped_current_field_name.clear(); |
| 125 | } |
| 126 | |
| 127 | virtual void visit(const lst::integer_type& type) override final |
| 128 | { |
| 129 | _description += "integer { "; |
| 130 | |
| 131 | /* Mandatory properties (no defaults). */ |
| 132 | _description += fmt::format("size = {size}; align = {alignment};", |
| 133 | fmt::arg("size", type.size), |
| 134 | fmt::arg("alignment", type.alignment)); |
| 135 | |
| 136 | /* Defaults to unsigned. */ |
| 137 | if (type.signedness_ == lst::integer_type::signedness::SIGNED) { |
| 138 | _description += " signed = true;"; |
| 139 | } |
| 140 | |
| 141 | /* Defaults to 10. */ |
| 142 | if (type.base_ != lst::integer_type::base::DECIMAL) { |
| 143 | unsigned int base; |
| 144 | |
| 145 | switch (type.base_) { |
| 146 | case lst::integer_type::base::BINARY: |
| 147 | base = 2; |
| 148 | break; |
| 149 | case lst::integer_type::base::OCTAL: |
| 150 | base = 8; |
| 151 | break; |
| 152 | case lst::integer_type::base::HEXADECIMAL: |
| 153 | base = 16; |
| 154 | break; |
| 155 | default: |
| 156 | LTTNG_THROW_ERROR(fmt::format( |
| 157 | "Unexpected base encountered while serializing integer type to TSDL: base = {}", |
| 158 | (int) type.base_)); |
| 159 | } |
| 160 | |
| 161 | _description += fmt::format(" base = {};", base); |
| 162 | } |
| 163 | |
| 164 | /* Defaults to the trace's native byte order. */ |
| 165 | if (type.byte_order != _trace_abi.byte_order) { |
| 166 | const auto byte_order_str = type.byte_order == lst::byte_order::BIG_ENDIAN_ ? "be" : "le"; |
| 167 | |
| 168 | _description += fmt::format(" byte_order = {};", byte_order_str); |
| 169 | } |
| 170 | |
| 171 | if (_current_integer_encoding_override) { |
| 172 | const char *encoding_str; |
| 173 | |
| 174 | switch (*_current_integer_encoding_override) { |
| 175 | case lst::string_type::encoding::ASCII: |
| 176 | encoding_str = "ASCII"; |
| 177 | break; |
| 178 | case lst::string_type::encoding::UTF8: |
| 179 | encoding_str = "UTF8"; |
| 180 | break; |
| 181 | default: |
| 182 | LTTNG_THROW_ERROR(fmt::format( |
| 183 | "Unexpected encoding encountered while serializing integer type to TSDL: encoding = {}", |
| 184 | (int) *_current_integer_encoding_override)); |
| 185 | } |
| 186 | |
| 187 | _description += fmt::format(" encoding = {};", encoding_str); |
| 188 | _current_integer_encoding_override.reset(); |
| 189 | } |
| 190 | |
| 191 | _description += " }"; |
| 192 | } |
| 193 | |
| 194 | virtual void visit(const lst::floating_point_type& type) override final |
| 195 | { |
| 196 | _description += fmt::format( |
| 197 | "floating_point {{ align = {alignment}; mant_dig = {mantissa_digits}; exp_dig = {exponent_digits};", |
| 198 | fmt::arg("alignment", type.alignment), |
| 199 | fmt::arg("mantissa_digits", type.mantissa_digits), |
| 200 | fmt::arg("exponent_digits", type.exponent_digits)); |
| 201 | |
| 202 | /* Defaults to the trace's native byte order. */ |
| 203 | if (type.byte_order != _trace_abi.byte_order) { |
| 204 | const auto byte_order_str = type.byte_order == lst::byte_order::BIG_ENDIAN_ ? "be" : "le"; |
| 205 | |
| 206 | _description += fmt::format(" byte_order = {};", byte_order_str); |
| 207 | } |
| 208 | |
| 209 | _description += " }"; |
| 210 | } |
| 211 | |
| 212 | template <class EnumerationType> |
| 213 | void visit_enumeration(const EnumerationType& type) |
| 214 | { |
| 215 | /* name follows, when applicable. */ |
| 216 | _description += "enum : "; |
| 217 | |
| 218 | tsdl_field_visitor integer_visitor{_trace_abi, _indentation_level}; |
| 219 | |
| 220 | integer_visitor.visit(static_cast<const lst::integer_type&>(type)); |
| 221 | _description += integer_visitor.get_description() + " {\n"; |
| 222 | |
| 223 | const auto mappings_indentation_level = _indentation_level + 1; |
| 224 | |
| 225 | bool first_mapping = true; |
| 226 | for (const auto& mapping : *type._mappings) { |
| 227 | if (!first_mapping) { |
| 228 | _description += ",\n"; |
| 229 | } |
| 230 | |
| 231 | _description.resize(_description.size() + mappings_indentation_level, '\t'); |
| 232 | if (!mapping.range) { |
| 233 | _description += fmt::format("\"{}\"", mapping.name); |
| 234 | } else if (mapping.range->begin == mapping.range->end) { |
| 235 | _description += fmt::format( |
| 236 | "\"{mapping_name}\" = {mapping_value}", |
| 237 | fmt::arg("mapping_name", mapping.name), |
| 238 | fmt::arg("mapping_value", mapping.range->begin)); |
| 239 | } else { |
| 240 | _description += fmt::format( |
| 241 | "\"{mapping_name}\" = {mapping_range_begin} ... {mapping_range_end}", |
| 242 | fmt::arg("mapping_name", mapping.name), |
| 243 | fmt::arg("mapping_range_begin", |
| 244 | mapping.range->begin), |
| 245 | fmt::arg("mapping_range_end", mapping.range->end)); |
| 246 | } |
| 247 | |
| 248 | first_mapping = false; |
| 249 | } |
| 250 | |
| 251 | _description += "\n"; |
| 252 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 253 | _description += "}"; |
| 254 | } |
| 255 | |
| 256 | virtual void visit(const lst::signed_enumeration_type& type) override final |
| 257 | { |
| 258 | visit_enumeration(type); |
| 259 | } |
| 260 | |
| 261 | virtual void visit(const lst::unsigned_enumeration_type& type) override final |
| 262 | { |
| 263 | visit_enumeration(type); |
| 264 | } |
| 265 | |
| 266 | virtual void visit(const lst::static_length_array_type& type) override final |
| 267 | { |
| 268 | if (type.alignment != 0) { |
| 269 | LTTNG_ASSERT(_escaped_current_field_name.size() > 0); |
| 270 | _description += fmt::format( |
| 271 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 272 | fmt::arg("alignment", type.alignment), |
| 273 | fmt::arg("field_name", _escaped_current_field_name)); |
| 274 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 275 | } |
| 276 | |
| 277 | type.element_type->accept(*this); |
| 278 | _type_suffixes.emplace(fmt::format("[{}]", type.length)); |
| 279 | } |
| 280 | |
| 281 | virtual void visit(const lst::dynamic_length_array_type& type) override final |
| 282 | { |
| 283 | if (type.alignment != 0) { |
| 284 | /* |
| 285 | * Note that this doesn't support nested sequences. For |
| 286 | * the moment, tracers can't express those. However, we |
| 287 | * could wrap nested sequences in structures, which |
| 288 | * would allow us to express alignment constraints. |
| 289 | */ |
| 290 | LTTNG_ASSERT(_escaped_current_field_name.size() > 0); |
| 291 | _description += fmt::format( |
| 292 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 293 | fmt::arg("alignment", type.alignment), |
| 294 | fmt::arg("field_name", _escaped_current_field_name)); |
| 295 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 296 | } |
| 297 | |
| 298 | type.element_type->accept(*this); |
| 299 | _type_suffixes.emplace(fmt::format( |
| 300 | "[{}]", escape_tsdl_identifier(type.length_field_name))); |
| 301 | } |
| 302 | |
| 303 | virtual void visit(const lst::static_length_blob_type& type) override final |
| 304 | { |
| 305 | /* This type doesn't exist in CTF 1.x, express it as a static length array of uint8_t. */ |
| 306 | std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(8, |
| 307 | _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED, |
| 308 | lst::integer_type::base::HEXADECIMAL); |
| 309 | const auto array = lttng::make_unique<lst::static_length_array_type>( |
| 310 | type.alignment, std::move(uint8_element), type.length_bytes); |
| 311 | |
| 312 | visit(*array); |
| 313 | } |
| 314 | |
| 315 | virtual void visit(const lst::dynamic_length_blob_type& type) override final |
| 316 | { |
| 317 | /* This type doesn't exist in CTF 1.x, express it as a dynamic length array of uint8_t. */ |
| 318 | std::unique_ptr<const lst::type> uint8_element = lttng::make_unique<lst::integer_type>(0, |
| 319 | _trace_abi.byte_order, 8, lst::integer_type::signedness::UNSIGNED, |
| 320 | lst::integer_type::base::HEXADECIMAL); |
| 321 | const auto array = lttng::make_unique<lst::dynamic_length_array_type>( |
| 322 | type.alignment, std::move(uint8_element), type.length_field_name); |
| 323 | |
| 324 | visit(*array); |
| 325 | } |
| 326 | |
| 327 | virtual void visit(const lst::null_terminated_string_type& type) override final |
| 328 | { |
| 329 | /* Defaults to UTF-8. */ |
| 330 | if (type.encoding_ == lst::null_terminated_string_type::encoding::ASCII) { |
| 331 | _description += "string { encoding = ASCII }"; |
| 332 | } else { |
| 333 | _description += "string"; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | virtual void visit(const lst::structure_type& type) override final |
| 338 | { |
| 339 | _indentation_level++; |
| 340 | _description += "struct {"; |
| 341 | |
| 342 | for (const auto& field : type._fields) { |
| 343 | _description += "\n"; |
| 344 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 345 | field->accept(*this); |
| 346 | } |
| 347 | |
| 348 | _indentation_level--; |
| 349 | if (type._fields.size() != 0) { |
| 350 | _description += "\n"; |
| 351 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 352 | } |
| 353 | |
| 354 | _description += "};"; |
| 355 | } |
| 356 | |
| 357 | virtual void visit(const lst::variant_type& type) override final |
| 358 | { |
| 359 | if (type.alignment != 0) { |
| 360 | LTTNG_ASSERT(_escaped_current_field_name.size() > 0); |
| 361 | _description += fmt::format( |
| 362 | "struct {{ }} align({alignment}) {field_name}_padding;\n", |
| 363 | fmt::arg("alignment", type.alignment), |
| 364 | fmt::arg("field_name", _escaped_current_field_name)); |
| 365 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 366 | } |
| 367 | |
| 368 | _indentation_level++; |
| 369 | _description += fmt::format("variant <{}> {\n", escape_tsdl_identifier(type.tag_name)); |
| 370 | |
| 371 | bool first_field = true; |
| 372 | for (const auto& field : type._choices) { |
| 373 | if (!first_field) { |
| 374 | _description += ",\n"; |
| 375 | } |
| 376 | |
| 377 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 378 | field->accept(*this); |
| 379 | first_field = false; |
| 380 | } |
| 381 | |
| 382 | _description += "\n"; |
| 383 | _description.resize(_description.size() + _indentation_level, '\t'); |
| 384 | _description += "};"; |
| 385 | _indentation_level--; |
| 386 | } |
| 387 | |
| 388 | lst::type::cuptr create_character_type(enum lst::string_type::encoding encoding) |
| 389 | { |
| 390 | _current_integer_encoding_override = encoding; |
| 391 | return lttng::make_unique<lst::integer_type>(8, _trace_abi.byte_order, 8, |
| 392 | lst::integer_type::signedness::UNSIGNED, |
| 393 | lst::integer_type::base::DECIMAL); |
| 394 | } |
| 395 | |
| 396 | virtual void visit(const lst::static_length_string_type& type) override final |
| 397 | { |
| 398 | /* |
| 399 | * TSDL expresses static-length strings as arrays of 8-bit integer with |
| 400 | * an encoding specified. |
| 401 | */ |
| 402 | const auto char_array = lttng::make_unique<lst::static_length_array_type>( |
| 403 | type.alignment, create_character_type(type.encoding_), type.length); |
| 404 | |
| 405 | visit(*char_array); |
| 406 | } |
| 407 | |
| 408 | virtual void visit(const lst::dynamic_length_string_type& type) override final |
| 409 | { |
| 410 | /* |
| 411 | * TSDL expresses dynamic-length strings as arrays of 8-bit integer with |
| 412 | * an encoding specified. |
| 413 | */ |
| 414 | const auto char_sequence = lttng::make_unique<lst::dynamic_length_array_type>( |
| 415 | type.alignment, create_character_type(type.encoding_), |
| 416 | type.length_field_name); |
| 417 | |
| 418 | visit(*char_sequence); |
| 419 | } |
| 420 | |
| 421 | std::string _escaped_current_field_name; |
| 422 | /* |
| 423 | * Encoding to specify for the next serialized integer type. |
| 424 | * Since the integer_type does not allow an encoding to be specified (it is a TSDL-specific |
| 425 | * concept), this attribute is used when expressing static or dynamic length strings as |
| 426 | * arrays/sequences of bytes with an encoding. |
| 427 | */ |
| 428 | nonstd::optional<enum lst::string_type::encoding> _current_integer_encoding_override; |
| 429 | |
| 430 | unsigned int _indentation_level; |
| 431 | const lst::abi& _trace_abi; |
| 432 | |
| 433 | std::queue<std::string> _type_suffixes; |
| 434 | |
| 435 | /* Description in TSDL format. */ |
| 436 | std::string _description; |
| 437 | }; |
| 438 | } /* namespace */ |
| 439 | |
| 440 | tsdl::trace_class_visitor::trace_class_visitor(const lst::abi& trace_abi, |
| 441 | tsdl::append_metadata_fragment_function append_metadata_fragment) : |
| 442 | _trace_abi{trace_abi}, _append_metadata_fragment(append_metadata_fragment) |
| 443 | { |
| 444 | } |
| 445 | |
| 446 | void tsdl::trace_class_visitor::append_metadata_fragment(const std::string& fragment) const |
| 447 | { |
| 448 | _append_metadata_fragment(fragment); |
| 449 | } |
| 450 | |
| 451 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::trace_class& trace_class) |
| 452 | { |
| 453 | /* Declare type aliases, trace class, and packet header. */ |
| 454 | auto trace_class_tsdl = fmt::format( |
| 455 | "/* CTF {ctf_major}.{ctf_minor} */\n\n" |
| 456 | "typealias integer {{ size = 8; align = {uint8_t_alignment}; signed = false; }} := uint8_t;\n" |
| 457 | "typealias integer {{ size = 16; align = {uint16_t_alignment}; signed = false; }} := uint16_t;\n" |
| 458 | "typealias integer {{ size = 32; align = {uint32_t_alignment}; signed = false; }} := uint32_t;\n" |
| 459 | "typealias integer {{ size = 64; align = {uint64_t_alignment}; signed = false; }} := uint64_t;\n" |
| 460 | "typealias integer {{ size = {bits_per_long}; align = {long_alignment}; signed = false; }} := unsigned long;\n" |
| 461 | "typealias integer {{ size = 5; align = 1; signed = false; }} := uint5_t;\n" |
| 462 | "typealias integer {{ size = 27; align = 1; signed = false; }} := uint27_t;\n" |
| 463 | "\n" |
| 464 | "trace {{\n" |
| 465 | " major = {ctf_major};\n" |
| 466 | " minor = {ctf_minor};\n" |
| 467 | " uuid = \"{uuid}\";\n" |
| 468 | " byte_order = {byte_order};\n" |
| 469 | " packet.header := struct {{\n" |
| 470 | " uint32_t magic;\n" |
| 471 | " uint8_t uuid[16];\n" |
| 472 | " uint32_t stream_id;\n" |
| 473 | " uint64_t stream_instance_id;\n" |
| 474 | " }};\n" |
| 475 | "}};\n\n", |
| 476 | fmt::arg("ctf_major", ctf_spec_major), |
| 477 | fmt::arg("ctf_minor", ctf_spec_minor), |
| 478 | fmt::arg("uint8_t_alignment", trace_class.abi.uint8_t_alignment), |
| 479 | fmt::arg("uint16_t_alignment", trace_class.abi.uint16_t_alignment), |
| 480 | fmt::arg("uint32_t_alignment", trace_class.abi.uint32_t_alignment), |
| 481 | fmt::arg("uint64_t_alignment", trace_class.abi.uint64_t_alignment), |
| 482 | fmt::arg("long_alignment", trace_class.abi.long_alignment), |
| 483 | fmt::arg("long_size", trace_class.abi.long_alignment), |
| 484 | fmt::arg("bits_per_long", trace_class.abi.bits_per_long), |
| 485 | fmt::arg("uuid", lttng::utils::uuid_to_str(trace_class.uuid)), |
| 486 | fmt::arg("byte_order", |
| 487 | trace_class.abi.byte_order == lst::byte_order::BIG_ENDIAN_ ? |
| 488 | "be" : |
| 489 | "le")); |
| 490 | |
| 491 | /* Declare trace scope and type aliases. */ |
| 492 | append_metadata_fragment(std::move(trace_class_tsdl)); |
| 493 | } |
| 494 | |
| 495 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::clock_class& clock_class) |
| 496 | { |
| 497 | auto uuid_str = clock_class.uuid ? |
| 498 | fmt::format(" uuid = \"{}\";\n", |
| 499 | lttng::utils::uuid_to_str(*clock_class.uuid)) : |
| 500 | ""; |
| 501 | |
| 502 | /* Assumes a single clock that maps to specific stream class fields/roles. */ |
| 503 | auto clock_class_str = fmt::format( |
| 504 | "clock {{\n" |
| 505 | " name = \"{name}\";\n" |
| 506 | /* Optional uuid. */ |
| 507 | "{uuid}" |
| 508 | " description = \"{description}\";\n" |
| 509 | " freq = {frequency};\n" |
| 510 | " offset = {offset};\n" |
| 511 | "}};\n" |
| 512 | "\n" |
| 513 | "typealias integer {{\n" |
| 514 | " size = 27; align = 1; signed = false;\n" |
| 515 | " map = clock.{name}.value;\n" |
| 516 | "}} := uint27_clock_{name}_t;\n" |
| 517 | "\n" |
| 518 | "typealias integer {{\n" |
| 519 | " size = 32; align = {uint32_t_alignment}; signed = false;\n" |
| 520 | " map = clock.{name}.value;\n" |
| 521 | "}} := uint32_clock_{name}_t;\n" |
| 522 | "\n" |
| 523 | "typealias integer {{\n" |
| 524 | " size = 64; align = {uint64_t_alignment}; signed = false;\n" |
| 525 | " map = clock.{name}.value;\n" |
| 526 | "}} := uint64_clock_{name}_t;\n" |
| 527 | "\n" |
| 528 | "struct packet_context {{\n" |
| 529 | " uint64_clock_{name}_t timestamp_begin;\n" |
| 530 | " uint64_clock_{name}_t timestamp_end;\n" |
| 531 | " uint64_t content_size;\n" |
| 532 | " uint64_t packet_size;\n" |
| 533 | " uint64_t packet_seq_num;\n" |
| 534 | " unsigned long events_discarded;\n" |
| 535 | " uint32_t cpu_id;\n" |
| 536 | "}};\n" |
| 537 | "\n" |
| 538 | "struct event_header_compact {{\n" |
| 539 | " enum : uint5_t {{ compact = 0 ... 30, extended = 31 }} id;\n" |
| 540 | " variant <id> {{\n" |
| 541 | " struct {{\n" |
| 542 | " uint27_clock_{name}_t timestamp;\n" |
| 543 | " }} compact;\n" |
| 544 | " struct {{\n" |
| 545 | " uint32_t id;\n" |
| 546 | " uint64_clock_{name}_t timestamp;\n" |
| 547 | " }} extended;\n" |
| 548 | " }} v;\n" |
| 549 | "}} align({uint32_t_alignment});\n" |
| 550 | "\n" |
| 551 | "struct event_header_large {{\n" |
| 552 | " enum : uint16_t {{ compact = 0 ... 65534, extended = 65535 }} id;\n" |
| 553 | " variant <id> {{\n" |
| 554 | " struct {{\n" |
| 555 | " uint32_clock_{name}_t timestamp;\n" |
| 556 | " }} compact;\n" |
| 557 | " struct {{\n" |
| 558 | " uint32_t id;\n" |
| 559 | " uint64_clock_{name}_t timestamp;\n" |
| 560 | " }} extended;\n" |
| 561 | " }} v;\n" |
| 562 | "}} align({uint16_t_alignment});\n\n", |
| 563 | fmt::arg("name", clock_class.name), |
| 564 | fmt::arg("uuid", uuid_str), |
| 565 | fmt::arg("description", clock_class.description), |
| 566 | fmt::arg("frequency", clock_class.frequency), |
| 567 | fmt::arg("offset", clock_class.offset), |
| 568 | fmt::arg("uint16_t_alignment", _trace_abi.uint16_t_alignment), |
| 569 | fmt::arg("uint32_t_alignment", _trace_abi.uint32_t_alignment), |
| 570 | fmt::arg("uint64_t_alignment", _trace_abi.uint64_t_alignment)); |
| 571 | |
| 572 | append_metadata_fragment(std::move(clock_class_str)); |
| 573 | } |
| 574 | |
| 575 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::stream_class& stream_class) |
| 576 | { |
| 577 | /* Declare stream. */ |
| 578 | auto stream_class_str = fmt::format("stream {{\n" |
| 579 | " id = {id};\n" |
| 580 | " event.header := {header_type};\n" |
| 581 | " packet.context := struct packet_context;\n", |
| 582 | fmt::arg("id", stream_class.id), |
| 583 | fmt::arg("header_type", stream_class.header_type_ == lst::stream_class::header_type::COMPACT ? |
| 584 | "struct event_header_compact" : |
| 585 | "struct event_header_large")); |
| 586 | |
| 587 | auto context_field_visitor = tsdl_field_visitor(_trace_abi, 1); |
| 588 | |
| 589 | stream_class.get_context().accept(static_cast<lst::type_visitor&>(context_field_visitor)); |
| 590 | |
| 591 | stream_class_str += fmt::format(" event.context := {}\n}};\n\n", |
| 592 | context_field_visitor.get_description()); |
| 593 | |
| 594 | append_metadata_fragment(stream_class_str); |
| 595 | } |
| 596 | |
| 597 | void tsdl::trace_class_visitor::visit(const lttng::sessiond::trace::event_class& event_class) |
| 598 | { |
| 599 | auto event_class_str = fmt::format("event {{\n" |
| 600 | " name = \"{name}\";\n" |
| 601 | " id = {id};\n" |
| 602 | " stream_id = {stream_class_id};\n" |
| 603 | " loglevel = {log_level};\n", |
| 604 | fmt::arg("name", event_class.name), |
| 605 | fmt::arg("id", event_class.id), |
| 606 | fmt::arg("stream_class_id", event_class.stream_class_id), |
| 607 | fmt::arg("log_level", event_class.log_level)); |
| 608 | |
| 609 | if (event_class.model_emf_uri) { |
| 610 | event_class_str += fmt::format( |
| 611 | " model.emf.uri = \"{}\";\n", *event_class.model_emf_uri); |
| 612 | } |
| 613 | |
| 614 | auto payload_visitor = tsdl_field_visitor(_trace_abi, 1); |
| 615 | |
| 616 | event_class.payload->accept(static_cast<lst::type_visitor&>(payload_visitor)); |
| 617 | |
| 618 | event_class_str += fmt::format( |
| 619 | " fields := {}\n}};\n\n", payload_visitor.get_description()); |
| 620 | |
| 621 | append_metadata_fragment(event_class_str); |
| 622 | } |
| 623 | |
| 624 | void tsdl::trace_class_visitor::environment_begin() |
| 625 | { |
| 626 | _environment += "env {\n"; |
| 627 | } |
| 628 | |
| 629 | void tsdl::trace_class_visitor::visit( |
| 630 | const lttng::sessiond::trace::environment_field<int64_t>& field) |
| 631 | { |
| 632 | _environment += fmt::format(" {} = {};\n", field.name, field.value); |
| 633 | } |
| 634 | |
| 635 | void tsdl::trace_class_visitor::visit( |
| 636 | const lttng::sessiond::trace::environment_field<const char *>& field) |
| 637 | { |
| 638 | _environment += fmt::format( |
| 639 | " {} = \"{}\";\n", field.name, escape_tsdl_env_string_value(field.value)); |
| 640 | } |
| 641 | |
| 642 | void tsdl::trace_class_visitor::environment_end() |
| 643 | { |
| 644 | _environment += "};\n\n"; |
| 645 | append_metadata_fragment(_environment); |
| 646 | _environment.clear(); |
| 647 | } |