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d7bfb9b0 JG |
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 "ust-field-convert.hpp" | |
9 | ||
10 | #include <common/make-unique.hpp> | |
11 | ||
12 | #include <unordered_map> | |
13 | ||
14 | namespace lst = lttng::sessiond::trace; | |
15 | namespace lsu = lttng::sessiond::ust; | |
16 | namespace { | |
17 | ||
18 | /* | |
19 | * Type enclosing the session information that may be required during the decoding | |
20 | * of the lttng_ust_ctl_field array provided by applications on registration of | |
21 | * an event. | |
22 | */ | |
23 | class session_attributes { | |
24 | public: | |
25 | using registry_enum_getter_fn = | |
26 | std::function<lsu::registry_enum::const_rcu_protected_reference( | |
27 | const char *name, uint64_t id)>; | |
28 | ||
29 | session_attributes(registry_enum_getter_fn reg_enum_getter, | |
30 | lst::byte_order native_trace_byte_order) : | |
31 | get_registry_enum{reg_enum_getter}, _native_trace_byte_order{native_trace_byte_order} | |
32 | { | |
33 | } | |
34 | ||
35 | const registry_enum_getter_fn get_registry_enum; | |
36 | const lst::byte_order _native_trace_byte_order; | |
37 | }; | |
38 | ||
39 | /* Used to publish fields on which a field being decoded has an implicit dependency. */ | |
40 | using publish_field_fn = std::function<void(lst::field::cuptr)>; | |
41 | ||
42 | lst::type::cuptr create_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
43 | const lttng_ust_ctl_field *end, | |
44 | const session_attributes& session_attributes, | |
45 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
46 | publish_field_fn publish_field); | |
47 | ||
48 | void create_field_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
49 | const lttng_ust_ctl_field *end, | |
50 | const session_attributes& session_attributes, | |
51 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
52 | publish_field_fn publish_field); | |
53 | ||
54 | template <class UstCtlEncodingType> | |
55 | enum lst::null_terminated_string_type::encoding ust_ctl_encoding_to_string_field_encoding(UstCtlEncodingType encoding) | |
56 | { | |
57 | static const std::unordered_map<UstCtlEncodingType, enum lst::null_terminated_string_type::encoding> | |
58 | encoding_conversion_map = { | |
59 | {(UstCtlEncodingType) lttng_ust_ctl_encode_ASCII, | |
60 | lst::null_terminated_string_type::encoding::ASCII}, | |
61 | {(UstCtlEncodingType) lttng_ust_ctl_encode_UTF8, | |
62 | lst::null_terminated_string_type::encoding::UTF8}, | |
63 | }; | |
64 | ||
65 | const auto encoding_it = encoding_conversion_map.find(encoding); | |
66 | if (encoding_it == encoding_conversion_map.end()) { | |
67 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
68 | "Unknown lttng_ust_ctl_string_encodings value `{}` encountered when decoding integer field", | |
69 | encoding)); | |
70 | } | |
71 | ||
72 | return encoding_it->second; | |
73 | } | |
74 | ||
75 | template <class UstCtlBaseType> | |
76 | enum lst::integer_type::base ust_ctl_base_to_integer_field_base(UstCtlBaseType base) | |
77 | { | |
78 | static const std::unordered_map<UstCtlBaseType, enum lst::integer_type::base> | |
79 | base_conversion_map = {{2, lst::integer_type::base::BINARY}, | |
80 | {8, lst::integer_type::base::OCTAL}, | |
81 | {10, lst::integer_type::base::DECIMAL}, | |
82 | {16, lst::integer_type::base::HEXADECIMAL}}; | |
83 | ||
84 | const auto base_it = base_conversion_map.find(base); | |
85 | if (base_it == base_conversion_map.end()) { | |
86 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
87 | "Unknown integer base value `{}` encountered when decoding integer field", | |
88 | base)); | |
89 | } | |
90 | ||
91 | return base_it->second; | |
92 | } | |
93 | ||
94 | lst::type::cuptr create_integer_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
95 | const lttng_ust_ctl_field *end, | |
96 | const session_attributes& session_attributes, | |
97 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
98 | { | |
99 | if (current >= end) { | |
100 | LTTNG_THROW_PROTOCOL_ERROR( | |
101 | fmt::format("End of {} array reached unexpectedly during decoding", | |
102 | typeid(*current))); | |
103 | } | |
104 | ||
105 | const auto base = ust_ctl_base_to_integer_field_base(current->type.u.integer.base); | |
106 | const auto signedness = current->type.u.integer.signedness ? | |
107 | lst::integer_type::signedness::SIGNED : | |
108 | lst::integer_type::signedness::UNSIGNED; | |
109 | const auto byte_order = current->type.u.integer.reverse_byte_order ? | |
110 | lst::type::reverse_byte_order(session_attributes._native_trace_byte_order) : | |
111 | session_attributes._native_trace_byte_order; | |
112 | ||
113 | *next_ust_ctl_field = current + 1; | |
114 | ||
115 | return lttng::make_unique<const lst::integer_type>(current->type.u.integer.alignment, | |
116 | byte_order, current->type.u.integer.size, signedness, base); | |
117 | } | |
118 | ||
119 | lst::type::cuptr create_floating_point_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
120 | const lttng_ust_ctl_field *end, | |
121 | const session_attributes& session_attributes, | |
122 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
123 | { | |
124 | if (current >= end) { | |
125 | LTTNG_THROW_PROTOCOL_ERROR( | |
126 | fmt::format("End of {} array reached unexpectedly during decoding", | |
127 | typeid(*current))); | |
128 | } | |
129 | ||
130 | *next_ust_ctl_field = current + 1; | |
131 | ||
132 | const auto byte_order = current->type.u._float.reverse_byte_order ? | |
133 | lst::type::reverse_byte_order(session_attributes._native_trace_byte_order) : | |
134 | session_attributes._native_trace_byte_order; | |
135 | ||
136 | try { | |
137 | return lttng::make_unique<const lst::floating_point_type>( | |
138 | current->type.u._float.alignment, byte_order, | |
139 | current->type.u._float.exp_dig, current->type.u._float.mant_dig); | |
140 | } catch (lttng::invalid_argument_error& ex) { | |
141 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format("Invalid floating point attribute in {}: {}", | |
142 | typeid(*current), ex.what())); | |
143 | } | |
144 | } | |
145 | ||
146 | lst::type::cuptr create_enumeration_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
147 | const lttng_ust_ctl_field *end, | |
148 | const session_attributes& session_attributes, | |
149 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
150 | { | |
151 | if (current >= end) { | |
152 | LTTNG_THROW_PROTOCOL_ERROR( | |
153 | fmt::format("End of {} array reached unexpectedly during decoding", | |
154 | typeid(*current))); | |
155 | } | |
156 | ||
157 | uint64_t enumeration_id; | |
158 | const auto& enum_uctl_field = *current; | |
159 | const char *enumeration_name; | |
160 | const auto *enum_container_uctl_type = | |
161 | ¤t->type.u.legacy.basic.enumeration.container_type; | |
162 | ||
163 | if (enum_uctl_field.type.atype == lttng_ust_ctl_atype_enum_nestable) { | |
164 | /* Nestable enumeration fields are followed by their container type. */ | |
165 | ++current; | |
166 | if (current >= end) { | |
167 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
168 | "Array of {} is too short to contain nestable enumeration's container", | |
169 | typeid(*current))); | |
170 | } | |
171 | ||
172 | if (current->type.atype != lttng_ust_ctl_atype_integer) { | |
173 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
174 | "Invalid type of nestable enum container: type id = {}", | |
175 | current->type.atype)); | |
176 | } | |
177 | ||
178 | enum_container_uctl_type = ¤t->type.u.integer; | |
179 | enumeration_id = enum_uctl_field.type.u.enum_nestable.id; | |
180 | enumeration_name = enum_uctl_field.type.u.enum_nestable.name; | |
181 | } else { | |
182 | enumeration_id = enum_uctl_field.type.u.legacy.basic.enumeration.id; | |
183 | enumeration_name = enum_uctl_field.type.u.legacy.basic.enumeration.name; | |
184 | } | |
185 | ||
186 | *next_ust_ctl_field = current + 1; | |
187 | ||
188 | const auto base = ust_ctl_base_to_integer_field_base(enum_container_uctl_type->base); | |
189 | const auto byte_order = enum_container_uctl_type->reverse_byte_order ? | |
190 | lst::integer_type::reverse_byte_order( | |
191 | session_attributes._native_trace_byte_order) : | |
192 | session_attributes._native_trace_byte_order; | |
193 | const auto signedness = enum_container_uctl_type->signedness ? | |
194 | lst::integer_type::signedness::SIGNED : | |
195 | lst::integer_type::signedness::UNSIGNED; | |
196 | ||
197 | if (enum_container_uctl_type->signedness) { | |
198 | const auto& enum_registry = static_cast<const lsu::registry_signed_enum&>( | |
199 | *session_attributes.get_registry_enum( | |
200 | enumeration_name, enumeration_id)); | |
201 | ||
202 | return lttng::make_unique<const lst::signed_enumeration_type>( | |
203 | enum_container_uctl_type->alignment, byte_order, | |
204 | enum_container_uctl_type->size, signedness, base, | |
205 | enum_registry._mappings); | |
206 | } else { | |
207 | const auto& enum_registry = static_cast<const lsu::registry_unsigned_enum&>( | |
208 | *session_attributes.get_registry_enum( | |
209 | enumeration_name, enumeration_id)); | |
210 | ||
211 | return lttng::make_unique<const lst::unsigned_enumeration_type>( | |
212 | enum_container_uctl_type->alignment, byte_order, | |
213 | enum_container_uctl_type->size, signedness, base, | |
214 | enum_registry._mappings); | |
215 | } | |
216 | } | |
217 | ||
218 | lst::type::cuptr create_string_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
219 | const lttng_ust_ctl_field *end, | |
220 | const session_attributes& session_attributes __attribute__((unused)), | |
221 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
222 | { | |
223 | if (current >= end) { | |
224 | LTTNG_THROW_PROTOCOL_ERROR( | |
225 | fmt::format("End of {} array reached unexpectedly during decoding", | |
226 | typeid(*current))); | |
227 | } | |
228 | ||
229 | const auto& string_uctl_field = *current; | |
230 | *next_ust_ctl_field = current + 1; | |
231 | ||
232 | const auto encoding = ust_ctl_encoding_to_string_field_encoding( | |
233 | string_uctl_field.type.u.string.encoding); | |
234 | ||
235 | return lttng::make_unique<const lst::null_terminated_string_type>(1, encoding); | |
236 | } | |
237 | ||
238 | lst::type::cuptr create_integer_type_from_ust_ctl_basic_type( | |
239 | const lttng_ust_ctl_basic_type& type, const session_attributes& session_attributes) | |
240 | { | |
241 | /* Checked by caller. */ | |
242 | LTTNG_ASSERT(type.atype == lttng_ust_ctl_atype_integer); | |
243 | ||
244 | const auto byte_order = type.u.basic.integer.reverse_byte_order ? | |
245 | lst::integer_type::reverse_byte_order( | |
246 | session_attributes._native_trace_byte_order) : | |
247 | session_attributes._native_trace_byte_order; | |
248 | const auto signedness = type.u.basic.integer.signedness ? | |
249 | lst::integer_type::signedness::SIGNED : | |
250 | lst::integer_type::signedness::UNSIGNED; | |
251 | const auto base = ust_ctl_base_to_integer_field_base(type.u.basic.integer.base); | |
252 | const auto size = type.u.basic.integer.size; | |
253 | const auto alignment = type.u.basic.integer.alignment; | |
254 | ||
255 | return lttng::make_unique<const lst::integer_type>( | |
256 | alignment, byte_order, size, signedness, base); | |
257 | } | |
258 | ||
259 | lst::type::cuptr create_array_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
260 | const lttng_ust_ctl_field *end, | |
261 | const session_attributes& session_attributes, | |
262 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
263 | { | |
264 | if (current >= end) { | |
265 | LTTNG_THROW_PROTOCOL_ERROR( | |
266 | fmt::format("End of {} array reached unexpectedly during decoding", | |
267 | typeid(*current))); | |
268 | } | |
269 | ||
270 | const auto& array_uctl_field = *current; | |
271 | uint32_t array_alignment, array_length; | |
272 | lst::type::cuptr element_type; | |
273 | nonstd::optional<enum lst::string_type::encoding> element_encoding; | |
274 | ||
275 | array_length = array_uctl_field.type.u.legacy.array.length; | |
276 | array_alignment = 0; | |
277 | ||
278 | const auto& element_uctl_type = array_uctl_field.type.u.legacy.array.elem_type; | |
279 | if (element_uctl_type.atype != lttng_ust_ctl_atype_integer) { | |
280 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
281 | "Unexpected legacy array element type: atype = {}, expected atype = lttng_ust_ctl_atype_integer ({})", | |
282 | element_uctl_type.atype, lttng_ust_ctl_atype_integer)); | |
283 | } | |
284 | ||
285 | element_type = create_integer_type_from_ust_ctl_basic_type( | |
286 | element_uctl_type, session_attributes); | |
287 | if (element_uctl_type.atype == lttng_ust_ctl_atype_integer && | |
288 | element_uctl_type.u.basic.integer.encoding != lttng_ust_ctl_encode_none) { | |
289 | /* Element represents a text character. */ | |
290 | element_encoding = ust_ctl_encoding_to_string_field_encoding( | |
291 | element_uctl_type.u.basic.integer.encoding); | |
292 | } | |
293 | ||
294 | *next_ust_ctl_field = current + 1; | |
295 | ||
296 | if (element_encoding) { | |
297 | const auto integer_element_size = | |
298 | static_cast<const lst::integer_type&>(*element_type).size; | |
299 | ||
300 | if (integer_element_size != 8) { | |
301 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
302 | "Unexpected legacy array element type: integer has encoding but size is not 8: size = {}", | |
303 | integer_element_size)); | |
304 | } | |
305 | ||
306 | /* Array is a static-length string. */ | |
307 | return lttng::make_unique<lst::static_length_string_type>( | |
308 | array_alignment, *element_encoding, array_length); | |
309 | } | |
310 | ||
311 | return lttng::make_unique<lst::static_length_array_type>( | |
312 | array_alignment, std::move(element_type), array_length); | |
313 | } | |
314 | ||
315 | lst::type::cuptr create_array_nestable_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
316 | const lttng_ust_ctl_field *end, | |
317 | const session_attributes& session_attributes, | |
318 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
319 | publish_field_fn publish_field) | |
320 | { | |
321 | if (current >= end) { | |
322 | LTTNG_THROW_PROTOCOL_ERROR( | |
323 | fmt::format("End of {} array reached unexpectedly during decoding", | |
324 | typeid(*current))); | |
325 | } | |
326 | ||
327 | const auto& array_uctl_field = *current; | |
328 | uint32_t array_alignment, array_length; | |
329 | lst::type::cuptr element_type; | |
330 | nonstd::optional<enum lst::string_type::encoding> element_encoding; | |
331 | ||
332 | array_length = array_uctl_field.type.u.array_nestable.length; | |
333 | array_alignment = array_uctl_field.type.u.array_nestable.alignment; | |
334 | ||
335 | /* Nestable array fields are followed by their element type. */ | |
336 | const auto& element_uctl_field = *(current + 1); | |
337 | ||
338 | /* next_ust_ctl_field is updated as needed. */ | |
339 | element_type = create_type_from_ust_ctl_fields(&element_uctl_field, end, session_attributes, | |
340 | next_ust_ctl_field, publish_field); | |
341 | if (element_uctl_field.type.atype == lttng_ust_ctl_atype_integer && | |
342 | element_uctl_field.type.u.integer.encoding != lttng_ust_ctl_encode_none) { | |
343 | /* Element represents a text character. */ | |
344 | element_encoding = ust_ctl_encoding_to_string_field_encoding( | |
345 | element_uctl_field.type.u.integer.encoding); | |
346 | } | |
347 | ||
348 | if (element_encoding) { | |
349 | const auto integer_element_size = | |
350 | static_cast<const lst::integer_type&>(*element_type).size; | |
351 | ||
352 | if (integer_element_size != 8) { | |
353 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
354 | "Unexpected array element type: integer has encoding but size is not 8: size = {}", | |
355 | integer_element_size)); | |
356 | } | |
357 | ||
358 | /* Array is a static-length string. */ | |
359 | return lttng::make_unique<lst::static_length_string_type>( | |
360 | array_alignment, *element_encoding, array_length); | |
361 | } | |
362 | ||
363 | return lttng::make_unique<lst::static_length_array_type>( | |
364 | array_alignment, std::move(element_type), array_length); | |
365 | } | |
366 | ||
367 | /* | |
368 | * For legacy sequence types, LTTng-UST expresses both the sequence and sequence | |
369 | * length as part of the same lttng_ust_ctl_field entry. | |
370 | */ | |
371 | lst::type::cuptr create_sequence_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
372 | const lttng_ust_ctl_field *end, | |
373 | const session_attributes& session_attributes, | |
374 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
375 | publish_field_fn publish_field) | |
376 | { | |
377 | if (current >= end) { | |
378 | LTTNG_THROW_PROTOCOL_ERROR( | |
379 | fmt::format("End of {} array reached unexpectedly during decoding", | |
380 | typeid(*current))); | |
381 | } | |
382 | ||
383 | const auto& sequence_uctl_field = *current; | |
384 | const auto& element_uctl_type = sequence_uctl_field.type.u.legacy.sequence.elem_type; | |
385 | const auto& length_uctl_type = sequence_uctl_field.type.u.legacy.sequence.length_type; | |
386 | const auto sequence_alignment = 0U; | |
387 | ||
388 | if (element_uctl_type.atype != lttng_ust_ctl_atype_integer) { | |
389 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
390 | "Unexpected legacy sequence element type: atype = {}, expected atype = lttng_ust_ctl_atype_integer ({})", | |
391 | element_uctl_type.atype, lttng_ust_ctl_atype_integer)); | |
392 | } | |
393 | ||
394 | if (length_uctl_type.atype != lttng_ust_ctl_atype_integer) { | |
395 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
396 | "Unexpected legacy sequence length field type: atype = {}, expected atype = lttng_ust_ctl_atype_integer ({})", | |
397 | length_uctl_type.atype, lttng_ust_ctl_atype_integer)); | |
398 | } | |
399 | ||
400 | nonstd::optional<enum lst::string_type::encoding> element_encoding; | |
401 | if (element_uctl_type.atype == lttng_ust_ctl_atype_integer && | |
402 | element_uctl_type.u.basic.integer.encoding != lttng_ust_ctl_encode_none) { | |
403 | /* Element represents a text character. */ | |
404 | element_encoding = ust_ctl_encoding_to_string_field_encoding( | |
405 | element_uctl_type.u.basic.integer.encoding); | |
406 | } | |
407 | ||
408 | const auto length_field_name = fmt::format("_{}_length", sequence_uctl_field.name); | |
409 | auto element_type = create_integer_type_from_ust_ctl_basic_type( | |
410 | element_uctl_type, session_attributes); | |
411 | auto length_type = create_integer_type_from_ust_ctl_basic_type( | |
412 | length_uctl_type, session_attributes); | |
413 | ||
414 | /* Publish an implicit length field _before_ the sequence field. */ | |
415 | publish_field(lttng::make_unique<lst::field>(length_field_name, std::move(length_type))); | |
416 | ||
417 | *next_ust_ctl_field = current + 1; | |
418 | ||
419 | if (element_encoding) { | |
420 | const auto integer_element_size = | |
421 | static_cast<const lst::integer_type&>(*element_type).size; | |
422 | ||
423 | if (integer_element_size != 8) { | |
424 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
425 | "Unexpected legacy array element type: integer has encoding but size is not 8: size = {}", | |
426 | integer_element_size)); | |
427 | } | |
428 | ||
429 | /* Sequence is a dynamic-length string. */ | |
430 | return lttng::make_unique<lst::dynamic_length_string_type>(sequence_alignment, | |
431 | *element_encoding, std::move(length_field_name)); | |
432 | } | |
433 | ||
434 | return lttng::make_unique<lst::dynamic_length_array_type>( | |
435 | sequence_alignment, std::move(element_type), std::move(length_field_name)); | |
436 | } | |
437 | ||
438 | lst::type::cuptr create_sequence_nestable_type_from_ust_ctl_fields( | |
439 | const lttng_ust_ctl_field *current, | |
440 | const lttng_ust_ctl_field *end, | |
441 | const session_attributes& session_attributes, | |
442 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
443 | publish_field_fn publish_field) | |
444 | { | |
445 | if (current >= end) { | |
446 | LTTNG_THROW_PROTOCOL_ERROR( | |
447 | fmt::format("End of {} array reached unexpectedly during decoding", | |
448 | typeid(*current))); | |
449 | } | |
450 | ||
451 | const auto& sequence_uctl_field = *current; | |
452 | const auto sequence_alignment = sequence_uctl_field.type.u.sequence_nestable.alignment; | |
453 | const auto *length_field_name = sequence_uctl_field.type.u.sequence_nestable.length_name; | |
454 | ||
455 | /* Nestable sequence fields are followed by their element type. */ | |
456 | const auto& element_uctl_field = *(current + 1); | |
457 | ||
458 | nonstd::optional<enum lst::string_type::encoding> element_encoding; | |
459 | if (element_uctl_field.type.atype == lttng_ust_ctl_atype_integer && | |
460 | element_uctl_field.type.u.integer.encoding != lttng_ust_ctl_encode_none) { | |
461 | /* Element represents a text character. */ | |
462 | element_encoding = ust_ctl_encoding_to_string_field_encoding( | |
463 | element_uctl_field.type.u.integer.encoding); | |
464 | } | |
465 | ||
466 | /* next_ust_ctl_field is updated as needed. */ | |
467 | auto element_type = create_type_from_ust_ctl_fields(&element_uctl_field, end, | |
468 | session_attributes, next_ust_ctl_field, publish_field); | |
469 | ||
470 | if (lttng_strnlen(sequence_uctl_field.type.u.sequence_nestable.length_name, | |
471 | sizeof(sequence_uctl_field.type.u.sequence_nestable.length_name)) == | |
472 | sizeof(sequence_uctl_field.type.u.sequence_nestable.length_name)) { | |
473 | LTTNG_THROW_PROTOCOL_ERROR("Sequence length field name is not null terminated"); | |
474 | } | |
475 | ||
476 | if (element_encoding) { | |
477 | const auto integer_element_size = | |
478 | static_cast<const lst::integer_type&>(*element_type).size; | |
479 | ||
480 | if (integer_element_size != 8) { | |
481 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
482 | "Unexpected array element type: integer has encoding but size is not 8: size = {}", | |
483 | integer_element_size)); | |
484 | } | |
485 | ||
486 | /* Sqeuence is a dynamic-length string. */ | |
487 | return lttng::make_unique<lst::dynamic_length_string_type>(sequence_alignment, | |
488 | *element_encoding, std::move(length_field_name)); | |
489 | } | |
490 | ||
491 | return lttng::make_unique<lst::dynamic_length_array_type>( | |
492 | sequence_alignment, std::move(element_type), std::move(length_field_name)); | |
493 | } | |
494 | ||
495 | lst::type::cuptr create_structure_field_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
496 | const lttng_ust_ctl_field *end, | |
497 | const session_attributes& session_attributes __attribute__((unused)), | |
498 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
499 | { | |
500 | if (current >= end) { | |
501 | LTTNG_THROW_PROTOCOL_ERROR( | |
502 | fmt::format("End of {} array reached unexpectedly during decoding", | |
503 | typeid(*current))); | |
504 | } | |
505 | ||
506 | uint32_t field_count; | |
507 | uint32_t alignment; | |
508 | const auto& structure_uctl_field = *current; | |
509 | ||
510 | if (structure_uctl_field.type.atype == lttng_ust_ctl_atype_struct) { | |
511 | field_count = structure_uctl_field.type.u.legacy._struct.nr_fields; | |
512 | alignment = 0; | |
513 | } else { | |
514 | field_count = structure_uctl_field.type.u.struct_nestable.nr_fields; | |
515 | alignment = structure_uctl_field.type.u.struct_nestable.alignment; | |
516 | } | |
517 | ||
518 | if (field_count != 0) { | |
519 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
520 | "Only empty structures are supported by LTTng-UST: nr_fields = {}", | |
521 | field_count)); | |
522 | } | |
523 | ||
524 | *next_ust_ctl_field = current + 1; | |
525 | return lttng::make_unique<lst::structure_type>(alignment, lst::structure_type::fields()); | |
526 | } | |
527 | ||
528 | lst::type::cuptr create_variant_field_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
529 | const lttng_ust_ctl_field *end, | |
530 | const session_attributes& session_attributes, | |
531 | const lttng_ust_ctl_field **next_ust_ctl_field) | |
532 | { | |
533 | if (current >= end) { | |
534 | LTTNG_THROW_PROTOCOL_ERROR( | |
535 | fmt::format("End of {} array reached unexpectedly during decoding", | |
536 | typeid(*current))); | |
537 | } | |
538 | ||
539 | const auto& variant_uctl_field = *current; | |
540 | current++; | |
541 | ||
542 | uint32_t alignment; | |
543 | uint32_t choice_count; | |
544 | const char *tag_name; | |
545 | ||
546 | if (variant_uctl_field.type.atype == lttng_ust_ctl_atype_variant) { | |
547 | alignment = 0; | |
548 | choice_count = variant_uctl_field.type.u.legacy.variant.nr_choices; | |
549 | tag_name = variant_uctl_field.type.u.legacy.variant.tag_name; | |
550 | } else { | |
551 | alignment = variant_uctl_field.type.u.variant_nestable.alignment; | |
552 | choice_count = variant_uctl_field.type.u.variant_nestable.nr_choices; | |
553 | tag_name = variant_uctl_field.type.u.variant_nestable.tag_name; | |
554 | } | |
555 | ||
556 | /* Choices follow. next_ust_ctl_field is updated as needed. */ | |
557 | lst::variant_type::choices choices; | |
558 | for (unsigned int i = 0; i < choice_count; i++) { | |
559 | create_field_from_ust_ctl_fields(current, end, session_attributes, | |
560 | next_ust_ctl_field, [&choices](lst::field::cuptr field) { | |
561 | choices.emplace_back(std::move(field)); | |
562 | }); | |
563 | ||
564 | current = *next_ust_ctl_field; | |
565 | } | |
566 | ||
567 | return lttng::make_unique<lst::variant_type>(alignment, tag_name, std::move(choices)); | |
568 | } | |
569 | ||
570 | lst::type::cuptr create_type_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
571 | const lttng_ust_ctl_field *end, | |
572 | const session_attributes& session_attributes, | |
573 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
574 | publish_field_fn publish_field) | |
575 | { | |
576 | switch (current->type.atype) { | |
577 | case lttng_ust_ctl_atype_integer: | |
578 | return create_integer_type_from_ust_ctl_fields( | |
579 | current, end, session_attributes, next_ust_ctl_field); | |
580 | case lttng_ust_ctl_atype_enum: | |
581 | case lttng_ust_ctl_atype_enum_nestable: | |
582 | return create_enumeration_type_from_ust_ctl_fields( | |
583 | current, end, session_attributes, next_ust_ctl_field); | |
584 | case lttng_ust_ctl_atype_float: | |
585 | return create_floating_point_type_from_ust_ctl_fields( | |
586 | current, end, session_attributes, next_ust_ctl_field); | |
587 | case lttng_ust_ctl_atype_string: | |
588 | return create_string_type_from_ust_ctl_fields( | |
589 | current, end, session_attributes, next_ust_ctl_field); | |
590 | case lttng_ust_ctl_atype_array: | |
591 | return create_array_type_from_ust_ctl_fields(current, end, session_attributes, | |
592 | next_ust_ctl_field); | |
593 | case lttng_ust_ctl_atype_array_nestable: | |
594 | return create_array_nestable_type_from_ust_ctl_fields(current, end, | |
595 | session_attributes, next_ust_ctl_field, publish_field); | |
596 | case lttng_ust_ctl_atype_sequence: | |
597 | return create_sequence_type_from_ust_ctl_fields(current, end, session_attributes, | |
598 | next_ust_ctl_field, publish_field); | |
599 | case lttng_ust_ctl_atype_sequence_nestable: | |
600 | return create_sequence_nestable_type_from_ust_ctl_fields(current, end, | |
601 | session_attributes, next_ust_ctl_field, publish_field); | |
602 | case lttng_ust_ctl_atype_struct: | |
603 | case lttng_ust_ctl_atype_struct_nestable: | |
604 | return create_structure_field_from_ust_ctl_fields( | |
605 | current, end, session_attributes, next_ust_ctl_field); | |
606 | case lttng_ust_ctl_atype_variant: | |
607 | case lttng_ust_ctl_atype_variant_nestable: | |
608 | return create_variant_field_from_ust_ctl_fields( | |
609 | current, end, session_attributes, next_ust_ctl_field); | |
610 | default: | |
611 | LTTNG_THROW_PROTOCOL_ERROR(fmt::format( | |
612 | "Unknown {} value `{}` encountered while converting {} to {}", | |
613 | typeid(current->type.atype), current->type.atype, typeid(*current), | |
614 | typeid(lst::type::cuptr::element_type))); | |
615 | } | |
616 | } | |
617 | ||
618 | void create_field_from_ust_ctl_fields(const lttng_ust_ctl_field *current, | |
619 | const lttng_ust_ctl_field *end, | |
620 | const session_attributes& session_attributes, | |
621 | const lttng_ust_ctl_field **next_ust_ctl_field, | |
622 | publish_field_fn publish_field) | |
623 | { | |
624 | LTTNG_ASSERT(current < end); | |
625 | ||
626 | if (lttng_strnlen(current->name, sizeof(current->name)) == sizeof(current->name)) { | |
627 | LTTNG_THROW_PROTOCOL_ERROR( | |
628 | fmt::format("Name of {} is not null-terminated", typeid(*current))); | |
629 | } | |
630 | ||
631 | publish_field(lttng::make_unique<lst::field>(current->name, | |
632 | create_type_from_ust_ctl_fields(current, end, session_attributes, | |
633 | next_ust_ctl_field, publish_field))); | |
634 | } | |
635 | ||
636 | /* | |
637 | * `lttng_ust_ctl_field`s can be nested, in which case creating a field will consume | |
638 | * more than one lttng_ust_ctl_field. create_field_from_ust_ctl_fields returns the | |
639 | * position of the next lttng_ust_ctl_field to consume or `end` when the last field | |
640 | * is consumed. | |
641 | * | |
642 | * Always returns a new field, throws on error. | |
643 | */ | |
644 | std::vector<lst::field::cuptr> create_fields_from_ust_ctl_fields( | |
b0f2e8db | 645 | const lsu::registry_session& session, |
d7bfb9b0 JG |
646 | const lttng_ust_ctl_field *current, |
647 | const lttng_ust_ctl_field *end) | |
648 | { | |
649 | std::vector<lst::field::cuptr> fields; | |
650 | const auto trace_native_byte_order = session.abi.byte_order; | |
651 | const session_attributes session_attributes{ | |
652 | [&session](const char *enum_name, uint64_t enum_id) { | |
97f630d4 | 653 | return session.get_enumeration(enum_name, enum_id); |
d7bfb9b0 JG |
654 | }, |
655 | trace_native_byte_order}; | |
656 | ||
657 | while (current < end) { | |
658 | auto *next_field = current; | |
659 | ||
660 | /* | |
661 | * create_field_from_ust_ctl_fields will consume one field at a time. | |
662 | * However, some fields expressed by LTTng-UST's protocol are expended | |
663 | * to multiple event fields (legacy sequence fields implicitly define | |
664 | * their length field). | |
665 | * | |
666 | * The lambda allows the factory functions to push as many fields as | |
667 | * needed depending on the decoded field's type. | |
668 | */ | |
669 | create_field_from_ust_ctl_fields(current, end, session_attributes, &next_field, | |
670 | [&fields](lst::field::cuptr field) { | |
671 | fields.emplace_back(std::move(field)); | |
672 | }); | |
673 | ||
674 | current = next_field; | |
675 | } | |
676 | ||
677 | return fields; | |
678 | } | |
679 | } /* namespace */ | |
680 | ||
681 | std::vector<lst::field::cuptr> lsu::create_trace_fields_from_ust_ctl_fields( | |
b0f2e8db | 682 | const lsu::registry_session& session, |
d7bfb9b0 JG |
683 | const lttng_ust_ctl_field *fields, |
684 | std::size_t field_count) | |
685 | { | |
686 | return create_fields_from_ust_ctl_fields(session, fields, fields + field_count); | |
687 | } |