1 //===- Trace.cpp - XRay Trace Loading implementation. ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // XRay log reader implementation.
12 //===----------------------------------------------------------------------===//
13 #include "llvm/XRay/Trace.h"
14 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/Support/DataExtractor.h"
16 #include "llvm/Support/Error.h"
17 #include "llvm/Support/FileSystem.h"
18 #include "llvm/XRay/YAMLXRayRecord.h"
21 using namespace llvm::xray;
22 using llvm::yaml::Input;
25 using XRayRecordStorage =
26 std::aligned_storage<sizeof(XRayRecord), alignof(XRayRecord)>::type;
28 // Populates the FileHeader reference by reading the first 32 bytes of the file.
29 Error readBinaryFormatHeader(StringRef Data, XRayFileHeader &FileHeader) {
30 // FIXME: Maybe deduce whether the data is little or big-endian using some
31 // magic bytes in the beginning of the file?
33 // First 32 bytes of the file will always be the header. We assume a certain
36 // (2) uint16 : version
38 // (4) uint32 : bitfield
39 // (8) uint64 : cycle frequency
42 DataExtractor HeaderExtractor(Data, true, 8);
43 uint32_t OffsetPtr = 0;
44 FileHeader.Version = HeaderExtractor.getU16(&OffsetPtr);
45 FileHeader.Type = HeaderExtractor.getU16(&OffsetPtr);
46 uint32_t Bitfield = HeaderExtractor.getU32(&OffsetPtr);
47 FileHeader.ConstantTSC = Bitfield & 1uL;
48 FileHeader.NonstopTSC = Bitfield & 1uL << 1;
49 FileHeader.CycleFrequency = HeaderExtractor.getU64(&OffsetPtr);
50 std::memcpy(&FileHeader.FreeFormData, Data.bytes_begin() + OffsetPtr, 16);
51 if (FileHeader.Version != 1 && FileHeader.Version != 2)
52 return make_error<StringError>(
53 Twine("Unsupported XRay file version: ") + Twine(FileHeader.Version),
54 std::make_error_code(std::errc::invalid_argument));
55 return Error::success();
58 Error loadNaiveFormatLog(StringRef Data, XRayFileHeader &FileHeader,
59 std::vector<XRayRecord> &Records) {
61 return make_error<StringError>(
62 "Not enough bytes for an XRay log.",
63 std::make_error_code(std::errc::invalid_argument));
65 if (Data.size() - 32 == 0 || Data.size() % 32 != 0)
66 return make_error<StringError>(
67 "Invalid-sized XRay data.",
68 std::make_error_code(std::errc::invalid_argument));
70 if (auto E = readBinaryFormatHeader(Data, FileHeader))
73 // Each record after the header will be 32 bytes, in the following format:
75 // (2) uint16 : record type
78 // (4) sint32 : function id
80 // (4) uint32 : thread id
82 for (auto S = Data.drop_front(32); !S.empty(); S = S.drop_front(32)) {
83 DataExtractor RecordExtractor(S, true, 8);
84 uint32_t OffsetPtr = 0;
85 switch (auto RecordType = RecordExtractor.getU16(&OffsetPtr)) {
86 case 0: { // Normal records.
87 Records.emplace_back();
88 auto &Record = Records.back();
89 Record.RecordType = RecordType;
90 Record.CPU = RecordExtractor.getU8(&OffsetPtr);
91 auto Type = RecordExtractor.getU8(&OffsetPtr);
94 Record.Type = RecordTypes::ENTER;
97 Record.Type = RecordTypes::EXIT;
100 Record.Type = RecordTypes::TAIL_EXIT;
103 Record.Type = RecordTypes::ENTER_ARG;
106 return make_error<StringError>(
107 Twine("Unknown record type '") + Twine(int{Type}) + "'",
108 std::make_error_code(std::errc::executable_format_error));
110 Record.FuncId = RecordExtractor.getSigned(&OffsetPtr, sizeof(int32_t));
111 Record.TSC = RecordExtractor.getU64(&OffsetPtr);
112 Record.TId = RecordExtractor.getU32(&OffsetPtr);
115 case 1: { // Arg payload record.
116 auto &Record = Records.back();
117 // Advance two bytes to avoid padding.
119 int32_t FuncId = RecordExtractor.getSigned(&OffsetPtr, sizeof(int32_t));
120 auto TId = RecordExtractor.getU32(&OffsetPtr);
121 if (Record.FuncId != FuncId || Record.TId != TId)
122 return make_error<StringError>(
123 Twine("Corrupted log, found payload following non-matching "
124 "function + thread record. Record for ") +
125 Twine(Record.FuncId) + " != " + Twine(FuncId),
126 std::make_error_code(std::errc::executable_format_error));
127 // Advance another four bytes to avoid padding.
129 auto Arg = RecordExtractor.getU64(&OffsetPtr);
130 Record.CallArgs.push_back(Arg);
134 return make_error<StringError>(
135 Twine("Unknown record type == ") + Twine(RecordType),
136 std::make_error_code(std::errc::executable_format_error));
139 return Error::success();
142 /// When reading from a Flight Data Recorder mode log, metadata records are
143 /// sparse compared to packed function records, so we must maintain state as we
144 /// read through the sequence of entries. This allows the reader to denormalize
145 /// the CPUId and Thread Id onto each Function Record and transform delta
146 /// encoded TSC values into absolute encodings on each record.
152 /// Encode some of the state transitions for the FDR log reader as explicit
153 /// checks. These are expectations for the next Record in the stream.
155 NEW_BUFFER_RECORD_OR_EOF,
159 SCAN_TO_END_OF_THREAD_BUF,
166 // Each threads buffer may have trailing garbage to scan over, so we track our
168 uint64_t CurrentBufferSize;
169 uint64_t CurrentBufferConsumed;
172 const char *fdrStateToTwine(const FDRState::Token &state) {
174 case FDRState::Token::NEW_BUFFER_RECORD_OR_EOF:
175 return "NEW_BUFFER_RECORD_OR_EOF";
176 case FDRState::Token::WALLCLOCK_RECORD:
177 return "WALLCLOCK_RECORD";
178 case FDRState::Token::NEW_CPU_ID_RECORD:
179 return "NEW_CPU_ID_RECORD";
180 case FDRState::Token::FUNCTION_SEQUENCE:
181 return "FUNCTION_SEQUENCE";
182 case FDRState::Token::SCAN_TO_END_OF_THREAD_BUF:
183 return "SCAN_TO_END_OF_THREAD_BUF";
184 case FDRState::Token::CUSTOM_EVENT_DATA:
185 return "CUSTOM_EVENT_DATA";
186 case FDRState::Token::CALL_ARGUMENT:
187 return "CALL_ARGUMENT";
188 case FDRState::Token::BUFFER_EXTENTS:
189 return "BUFFER_EXTENTS";
194 /// State transition when a NewBufferRecord is encountered.
195 Error processFDRNewBufferRecord(FDRState &State, uint8_t RecordFirstByte,
196 DataExtractor &RecordExtractor) {
198 if (State.Expects != FDRState::Token::NEW_BUFFER_RECORD_OR_EOF)
199 return make_error<StringError>(
200 Twine("Malformed log. Read New Buffer record kind out of sequence; "
202 fdrStateToTwine(State.Expects),
203 std::make_error_code(std::errc::executable_format_error));
204 uint32_t OffsetPtr = 1; // 1 byte into record.
205 State.ThreadId = RecordExtractor.getU16(&OffsetPtr);
206 State.Expects = FDRState::Token::WALLCLOCK_RECORD;
207 return Error::success();
210 /// State transition when an EndOfBufferRecord is encountered.
211 Error processFDREndOfBufferRecord(FDRState &State, uint8_t RecordFirstByte,
212 DataExtractor &RecordExtractor) {
213 if (State.Expects == FDRState::Token::NEW_BUFFER_RECORD_OR_EOF)
214 return make_error<StringError>(
215 Twine("Malformed log. Received EOB message without current buffer; "
217 fdrStateToTwine(State.Expects),
218 std::make_error_code(std::errc::executable_format_error));
219 State.Expects = FDRState::Token::SCAN_TO_END_OF_THREAD_BUF;
220 return Error::success();
223 /// State transition when a NewCPUIdRecord is encountered.
224 Error processFDRNewCPUIdRecord(FDRState &State, uint8_t RecordFirstByte,
225 DataExtractor &RecordExtractor) {
226 if (State.Expects != FDRState::Token::FUNCTION_SEQUENCE &&
227 State.Expects != FDRState::Token::NEW_CPU_ID_RECORD)
228 return make_error<StringError>(
229 Twine("Malformed log. Read NewCPUId record kind out of sequence; "
231 fdrStateToTwine(State.Expects),
232 std::make_error_code(std::errc::executable_format_error));
233 uint32_t OffsetPtr = 1; // Read starting after the first byte.
234 State.CPUId = RecordExtractor.getU16(&OffsetPtr);
235 State.BaseTSC = RecordExtractor.getU64(&OffsetPtr);
236 State.Expects = FDRState::Token::FUNCTION_SEQUENCE;
237 return Error::success();
240 /// State transition when a TSCWrapRecord (overflow detection) is encountered.
241 Error processFDRTSCWrapRecord(FDRState &State, uint8_t RecordFirstByte,
242 DataExtractor &RecordExtractor) {
243 if (State.Expects != FDRState::Token::FUNCTION_SEQUENCE)
244 return make_error<StringError>(
245 Twine("Malformed log. Read TSCWrap record kind out of sequence; "
247 fdrStateToTwine(State.Expects),
248 std::make_error_code(std::errc::executable_format_error));
249 uint32_t OffsetPtr = 1; // Read starting after the first byte.
250 State.BaseTSC = RecordExtractor.getU64(&OffsetPtr);
251 return Error::success();
254 /// State transition when a WallTimeMarkerRecord is encountered.
255 Error processFDRWallTimeRecord(FDRState &State, uint8_t RecordFirstByte,
256 DataExtractor &RecordExtractor) {
257 if (State.Expects != FDRState::Token::WALLCLOCK_RECORD)
258 return make_error<StringError>(
259 Twine("Malformed log. Read Wallclock record kind out of sequence; "
261 fdrStateToTwine(State.Expects),
262 std::make_error_code(std::errc::executable_format_error));
264 // TODO: Someday, reconcile the TSC ticks to wall clock time for presentation
265 // purposes. For now, we're ignoring these records.
266 State.Expects = FDRState::Token::NEW_CPU_ID_RECORD;
267 return Error::success();
270 /// State transition when a CustomEventMarker is encountered.
271 Error processCustomEventMarker(FDRState &State, uint8_t RecordFirstByte,
272 DataExtractor &RecordExtractor,
273 size_t &RecordSize) {
274 // We can encounter a CustomEventMarker anywhere in the log, so we can handle
275 // it regardless of the expectation. However, we do set the expectation to
276 // read a set number of fixed bytes, as described in the metadata.
277 uint32_t OffsetPtr = 1; // Read after the first byte.
278 uint32_t DataSize = RecordExtractor.getU32(&OffsetPtr);
279 uint64_t TSC = RecordExtractor.getU64(&OffsetPtr);
281 // FIXME: Actually represent the record through the API. For now we only
282 // skip through the data.
284 RecordSize = 16 + DataSize;
285 return Error::success();
288 /// State transition when an BufferExtents record is encountered.
289 Error processBufferExtents(FDRState &State, uint8_t RecordFirstByte,
290 DataExtractor &RecordExtractor) {
291 if (State.Expects != FDRState::Token::BUFFER_EXTENTS)
292 return make_error<StringError>(
293 Twine("Malformed log. Buffer Extents unexpected; expected: ") +
294 fdrStateToTwine(State.Expects),
295 std::make_error_code(std::errc::executable_format_error));
296 uint32_t OffsetPtr = 1; // Read after the first byte.
297 State.CurrentBufferSize = RecordExtractor.getU64(&OffsetPtr);
298 State.Expects = FDRState::Token::NEW_BUFFER_RECORD_OR_EOF;
299 return Error::success();
302 /// State transition when a CallArgumentRecord is encountered.
303 Error processFDRCallArgumentRecord(FDRState &State, uint8_t RecordFirstByte,
304 DataExtractor &RecordExtractor,
305 std::vector<XRayRecord> &Records) {
306 uint32_t OffsetPtr = 1; // Read starting after the first byte.
307 auto &Enter = Records.back();
309 if (Enter.Type != RecordTypes::ENTER)
310 return make_error<StringError>(
311 "CallArgument needs to be right after a function entry",
312 std::make_error_code(std::errc::executable_format_error));
313 Enter.Type = RecordTypes::ENTER_ARG;
314 Enter.CallArgs.emplace_back(RecordExtractor.getU64(&OffsetPtr));
315 return Error::success();
318 /// Advances the state machine for reading the FDR record type by reading one
319 /// Metadata Record and updating the State appropriately based on the kind of
320 /// record encountered. The RecordKind is encoded in the first byte of the
321 /// Record, which the caller should pass in because they have already read it
322 /// to determine that this is a metadata record as opposed to a function record.
324 /// Beginning with Version 2 of the FDR log, we do not depend on the size of the
325 /// buffer, but rather use the extents to determine how far to read in the log
326 /// for this particular buffer.
327 Error processFDRMetadataRecord(FDRState &State, uint8_t RecordFirstByte,
328 DataExtractor &RecordExtractor,
330 std::vector<XRayRecord> &Records,
332 // The remaining 7 bits are the RecordKind enum.
333 uint8_t RecordKind = RecordFirstByte >> 1;
334 switch (RecordKind) {
337 processFDRNewBufferRecord(State, RecordFirstByte, RecordExtractor))
340 case 1: // EndOfBuffer
342 return make_error<StringError>(
343 "Since Version 2 of FDR logging, we no longer support EOB records.",
344 std::make_error_code(std::errc::executable_format_error));
345 if (auto E = processFDREndOfBufferRecord(State, RecordFirstByte,
351 processFDRNewCPUIdRecord(State, RecordFirstByte, RecordExtractor))
356 processFDRTSCWrapRecord(State, RecordFirstByte, RecordExtractor))
359 case 4: // WallTimeMarker
361 processFDRWallTimeRecord(State, RecordFirstByte, RecordExtractor))
364 case 5: // CustomEventMarker
365 if (auto E = processCustomEventMarker(State, RecordFirstByte,
366 RecordExtractor, RecordSize))
369 case 6: // CallArgument
370 if (auto E = processFDRCallArgumentRecord(State, RecordFirstByte,
371 RecordExtractor, Records))
374 case 7: // BufferExtents
375 if (auto E = processBufferExtents(State, RecordFirstByte, RecordExtractor))
379 // Widen the record type to uint16_t to prevent conversion to char.
380 return make_error<StringError>(
381 Twine("Illegal metadata record type: ")
382 .concat(Twine(static_cast<unsigned>(RecordKind))),
383 std::make_error_code(std::errc::executable_format_error));
385 return Error::success();
388 /// Reads a function record from an FDR format log, appending a new XRayRecord
389 /// to the vector being populated and updating the State with a new value
390 /// reference value to interpret TSC deltas.
392 /// The XRayRecord constructed includes information from the function record
393 /// processed here as well as Thread ID and CPU ID formerly extracted into
395 Error processFDRFunctionRecord(FDRState &State, uint8_t RecordFirstByte,
396 DataExtractor &RecordExtractor,
397 std::vector<XRayRecord> &Records) {
398 switch (State.Expects) {
399 case FDRState::Token::NEW_BUFFER_RECORD_OR_EOF:
400 return make_error<StringError>(
401 "Malformed log. Received Function Record before new buffer setup.",
402 std::make_error_code(std::errc::executable_format_error));
403 case FDRState::Token::WALLCLOCK_RECORD:
404 return make_error<StringError>(
405 "Malformed log. Received Function Record when expecting wallclock.",
406 std::make_error_code(std::errc::executable_format_error));
407 case FDRState::Token::NEW_CPU_ID_RECORD:
408 return make_error<StringError>(
409 "Malformed log. Received Function Record before first CPU record.",
410 std::make_error_code(std::errc::executable_format_error));
412 Records.emplace_back();
413 auto &Record = Records.back();
414 Record.RecordType = 0; // Record is type NORMAL.
415 // Strip off record type bit and use the next three bits.
416 uint8_t RecordType = (RecordFirstByte >> 1) & 0x07;
417 switch (RecordType) {
418 case static_cast<uint8_t>(RecordTypes::ENTER):
419 Record.Type = RecordTypes::ENTER;
421 case static_cast<uint8_t>(RecordTypes::EXIT):
422 Record.Type = RecordTypes::EXIT;
424 case static_cast<uint8_t>(RecordTypes::TAIL_EXIT):
425 Record.Type = RecordTypes::TAIL_EXIT;
428 // Cast to an unsigned integer to not interpret the record type as a char.
429 return make_error<StringError>(
430 Twine("Illegal function record type: ")
431 .concat(Twine(static_cast<unsigned>(RecordType))),
432 std::make_error_code(std::errc::executable_format_error));
434 Record.CPU = State.CPUId;
435 Record.TId = State.ThreadId;
436 // Back up to read first 32 bits, including the 4 we pulled RecordType
437 // and RecordKind out of. The remaining 28 are FunctionId.
438 uint32_t OffsetPtr = 0;
439 // Despite function Id being a signed int on XRayRecord,
440 // when it is written to an FDR format, the top bits are truncated,
441 // so it is effectively an unsigned value. When we shift off the
442 // top four bits, we want the shift to be logical, so we read as
444 uint32_t FuncIdBitField = RecordExtractor.getU32(&OffsetPtr);
445 Record.FuncId = FuncIdBitField >> 4;
446 // FunctionRecords have a 32 bit delta from the previous absolute TSC
447 // or TSC delta. If this would overflow, we should read a TSCWrap record
448 // with an absolute TSC reading.
449 uint64_t NewTSC = State.BaseTSC + RecordExtractor.getU32(&OffsetPtr);
450 State.BaseTSC = NewTSC;
453 return Error::success();
456 /// Reads a log in FDR mode for version 1 of this binary format. FDR mode is
457 /// defined as part of the compiler-rt project in xray_fdr_logging.h, and such
458 /// a log consists of the familiar 32 bit XRayHeader, followed by sequences of
459 /// of interspersed 16 byte Metadata Records and 8 byte Function Records.
461 /// The following is an attempt to document the grammar of the format, which is
462 /// parsed by this function for little-endian machines. Since the format makes
463 /// use of BitFields, when we support big-endian architectures, we will need to
464 /// adjust not only the endianness parameter to llvm's RecordExtractor, but also
465 /// the bit twiddling logic, which is consistent with the little-endian
466 /// convention that BitFields within a struct will first be packed into the
467 /// least significant bits the address they belong to.
469 /// We expect a format complying with the grammar in the following pseudo-EBNF
470 /// in Version 1 of the FDR log.
472 /// FDRLog: XRayFileHeader ThreadBuffer*
473 /// XRayFileHeader: 32 bytes to identify the log as FDR with machine metadata.
474 /// Includes BufferSize
475 /// ThreadBuffer: NewBuffer WallClockTime NewCPUId FunctionSequence EOB
476 /// BufSize: 8 byte unsigned integer indicating how large the buffer is.
477 /// NewBuffer: 16 byte metadata record with Thread Id.
478 /// WallClockTime: 16 byte metadata record with human readable time.
479 /// NewCPUId: 16 byte metadata record with CPUId and a 64 bit TSC reading.
480 /// EOB: 16 byte record in a thread buffer plus mem garbage to fill BufSize.
481 /// FunctionSequence: NewCPUId | TSCWrap | FunctionRecord
482 /// TSCWrap: 16 byte metadata record with a full 64 bit TSC reading.
483 /// FunctionRecord: 8 byte record with FunctionId, entry/exit, and TSC delta.
485 /// In Version 2, we make the following changes:
487 /// ThreadBuffer: BufferExtents NewBuffer WallClockTime NewCPUId
489 /// BufferExtents: 16 byte metdata record describing how many usable bytes are
490 /// in the buffer. This is measured from the start of the buffer
491 /// and must always be at least 48 (bytes).
492 /// EOB: *deprecated*
493 Error loadFDRLog(StringRef Data, XRayFileHeader &FileHeader,
494 std::vector<XRayRecord> &Records) {
495 if (Data.size() < 32)
496 return make_error<StringError>(
497 "Not enough bytes for an XRay log.",
498 std::make_error_code(std::errc::invalid_argument));
500 // For an FDR log, there are records sized 16 and 8 bytes.
501 // There actually may be no records if no non-trivial functions are
503 if (Data.size() % 8 != 0)
504 return make_error<StringError>(
505 "Invalid-sized XRay data.",
506 std::make_error_code(std::errc::invalid_argument));
508 if (auto E = readBinaryFormatHeader(Data, FileHeader))
511 uint64_t BufferSize = 0;
513 StringRef ExtraDataRef(FileHeader.FreeFormData, 16);
514 DataExtractor ExtraDataExtractor(ExtraDataRef, true, 8);
515 uint32_t ExtraDataOffset = 0;
516 BufferSize = ExtraDataExtractor.getU64(&ExtraDataOffset);
519 FDRState::Token InitialExpectation;
520 switch (FileHeader.Version) {
522 InitialExpectation = FDRState::Token::NEW_BUFFER_RECORD_OR_EOF;
525 InitialExpectation = FDRState::Token::BUFFER_EXTENTS;
528 return make_error<StringError>(
529 Twine("Unsupported version '") + Twine(FileHeader.Version) + "'",
530 std::make_error_code(std::errc::executable_format_error));
532 FDRState State{0, 0, 0, InitialExpectation, BufferSize, 0};
534 // RecordSize will tell the loop how far to seek ahead based on the record
535 // type that we have just read.
536 size_t RecordSize = 0;
537 for (auto S = Data.drop_front(32); !S.empty(); S = S.drop_front(RecordSize)) {
538 DataExtractor RecordExtractor(S, true, 8);
539 uint32_t OffsetPtr = 0;
540 if (State.Expects == FDRState::Token::SCAN_TO_END_OF_THREAD_BUF) {
541 RecordSize = State.CurrentBufferSize - State.CurrentBufferConsumed;
542 if (S.size() < RecordSize) {
543 return make_error<StringError>(
544 Twine("Incomplete thread buffer. Expected at least ") +
545 Twine(RecordSize) + " bytes but found " + Twine(S.size()),
546 make_error_code(std::errc::invalid_argument));
548 State.CurrentBufferConsumed = 0;
549 State.Expects = FDRState::Token::NEW_BUFFER_RECORD_OR_EOF;
552 uint8_t BitField = RecordExtractor.getU8(&OffsetPtr);
553 bool isMetadataRecord = BitField & 0x01uL;
554 bool isBufferExtents =
555 (BitField >> 1) == 7; // BufferExtents record kind == 7
556 if (isMetadataRecord) {
559 processFDRMetadataRecord(State, BitField, RecordExtractor,
560 RecordSize, Records, FileHeader.Version))
562 } else { // Process Function Record
564 if (auto E = processFDRFunctionRecord(State, BitField, RecordExtractor,
569 // The BufferExtents record is technically not part of the buffer, so we
570 // don't count the size of that record against the buffer's actual size.
571 if (!isBufferExtents)
572 State.CurrentBufferConsumed += RecordSize;
573 assert(State.CurrentBufferConsumed <= State.CurrentBufferSize);
574 if (FileHeader.Version == 2 &&
575 State.CurrentBufferSize == State.CurrentBufferConsumed) {
576 // In Version 2 of the log, we don't need to scan to the end of the thread
577 // buffer if we've already consumed all the bytes we need to.
578 State.Expects = FDRState::Token::BUFFER_EXTENTS;
579 State.CurrentBufferSize = BufferSize;
580 State.CurrentBufferConsumed = 0;
584 // Having iterated over everything we've been given, we've either consumed
585 // everything and ended up in the end state, or were told to skip the rest.
586 bool Finished = State.Expects == FDRState::Token::SCAN_TO_END_OF_THREAD_BUF &&
587 State.CurrentBufferSize == State.CurrentBufferConsumed;
588 if ((State.Expects != FDRState::Token::NEW_BUFFER_RECORD_OR_EOF &&
589 State.Expects != FDRState::Token::BUFFER_EXTENTS) &&
591 return make_error<StringError>(
592 Twine("Encountered EOF with unexpected state expectation ") +
593 fdrStateToTwine(State.Expects) +
594 ". Remaining expected bytes in thread buffer total " +
595 Twine(State.CurrentBufferSize - State.CurrentBufferConsumed),
596 std::make_error_code(std::errc::executable_format_error));
598 return Error::success();
601 Error loadYAMLLog(StringRef Data, XRayFileHeader &FileHeader,
602 std::vector<XRayRecord> &Records) {
607 return make_error<StringError>("Failed loading YAML Data.", In.error());
609 FileHeader.Version = Trace.Header.Version;
610 FileHeader.Type = Trace.Header.Type;
611 FileHeader.ConstantTSC = Trace.Header.ConstantTSC;
612 FileHeader.NonstopTSC = Trace.Header.NonstopTSC;
613 FileHeader.CycleFrequency = Trace.Header.CycleFrequency;
615 if (FileHeader.Version != 1)
616 return make_error<StringError>(
617 Twine("Unsupported XRay file version: ") + Twine(FileHeader.Version),
618 std::make_error_code(std::errc::invalid_argument));
621 std::transform(Trace.Records.begin(), Trace.Records.end(),
622 std::back_inserter(Records), [&](const YAMLXRayRecord &R) {
623 return XRayRecord{R.RecordType, R.CPU, R.Type, R.FuncId,
624 R.TSC, R.TId, R.CallArgs};
626 return Error::success();
630 Expected<Trace> llvm::xray::loadTraceFile(StringRef Filename, bool Sort) {
632 if (auto EC = sys::fs::openFileForRead(Filename, Fd)) {
633 return make_error<StringError>(
634 Twine("Cannot read log from '") + Filename + "'", EC);
638 if (auto EC = sys::fs::file_size(Filename, FileSize)) {
639 return make_error<StringError>(
640 Twine("Cannot read log from '") + Filename + "'", EC);
643 return make_error<StringError>(
644 Twine("File '") + Filename + "' too small for XRay.",
645 std::make_error_code(std::errc::executable_format_error));
648 // Map the opened file into memory and use a StringRef to access it later.
650 sys::fs::mapped_file_region MappedFile(
651 Fd, sys::fs::mapped_file_region::mapmode::readonly, FileSize, 0, EC);
653 return make_error<StringError>(
654 Twine("Cannot read log from '") + Filename + "'", EC);
656 auto Data = StringRef(MappedFile.data(), MappedFile.size());
658 // Attempt to detect the file type using file magic. We have a slight bias
659 // towards the binary format, and we do this by making sure that the first 4
660 // bytes of the binary file is some combination of the following byte
661 // patterns: (observe the code loading them assumes they're little endian)
663 // 0x01 0x00 0x00 0x00 - version 1, "naive" format
664 // 0x01 0x00 0x01 0x00 - version 1, "flight data recorder" format
665 // 0x02 0x00 0x01 0x00 - version 2, "flight data recorder" format
667 // YAML files don't typically have those first four bytes as valid text so we
668 // try loading assuming YAML if we don't find these bytes.
670 // Only if we can't load either the binary or the YAML format will we yield an
672 StringRef Magic(MappedFile.data(), 4);
673 DataExtractor HeaderExtractor(Magic, true, 8);
674 uint32_t OffsetPtr = 0;
675 uint16_t Version = HeaderExtractor.getU16(&OffsetPtr);
676 uint16_t Type = HeaderExtractor.getU16(&OffsetPtr);
678 enum BinaryFormatType { NAIVE_FORMAT = 0, FLIGHT_DATA_RECORDER_FORMAT = 1 };
683 if (Version == 1 || Version == 2) {
684 if (auto E = loadNaiveFormatLog(Data, T.FileHeader, T.Records))
687 return make_error<StringError>(
688 Twine("Unsupported version for Basic/Naive Mode logging: ") +
690 std::make_error_code(std::errc::executable_format_error));
693 case FLIGHT_DATA_RECORDER_FORMAT:
694 if (Version == 1 || Version == 2) {
695 if (auto E = loadFDRLog(Data, T.FileHeader, T.Records))
698 return make_error<StringError>(
699 Twine("Unsupported version for FDR Mode logging: ") + Twine(Version),
700 std::make_error_code(std::errc::executable_format_error));
704 if (auto E = loadYAMLLog(Data, T.FileHeader, T.Records))
709 std::stable_sort(T.Records.begin(), T.Records.end(),
710 [&](const XRayRecord &L, const XRayRecord &R) {
711 return L.TSC < R.TSC;