contrib/llvm/tools/llvm-profdata/llvm-profdata.cpp

   1 //===- llvm-profdata.cpp - LLVM profile data tool -------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // llvm-profdata merges .profdata files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/ADT/SmallSet.h"
  15 #include "llvm/ADT/SmallVector.h"
  16 #include "llvm/ADT/StringRef.h"
  17 #include "llvm/IR/LLVMContext.h"
  18 #include "llvm/ProfileData/InstrProfReader.h"
  19 #include "llvm/ProfileData/InstrProfWriter.h"
  20 #include "llvm/ProfileData/ProfileCommon.h"
  21 #include "llvm/ProfileData/SampleProfReader.h"
  22 #include "llvm/ProfileData/SampleProfWriter.h"
  23 #include "llvm/Support/CommandLine.h"
  24 #include "llvm/Support/Errc.h"
  25 #include "llvm/Support/FileSystem.h"
  26 #include "llvm/Support/Format.h"
  27 #include "llvm/Support/ManagedStatic.h"
  28 #include "llvm/Support/MemoryBuffer.h"
  29 #include "llvm/Support/Path.h"
  30 #include "llvm/Support/PrettyStackTrace.h"
  31 #include "llvm/Support/Signals.h"
  32 #include "llvm/Support/raw_ostream.h"
  33 #include <algorithm>
  34
  35 using namespace llvm;
  36
  37 enum ProfileFormat { PF_None = 0, PF_Text, PF_Binary, PF_GCC };
  38
  39 static void exitWithError(const Twine &Message, StringRef Whence = "",
  40                           StringRef Hint = "") {
  41   errs() << "error: ";
  42   if (!Whence.empty())
  43     errs() << Whence << ": ";
  44   errs() << Message << "\n";
  45   if (!Hint.empty())
  46     errs() << Hint << "\n";
  47   ::exit(1);
  48 }
  49
  50 static void exitWithError(Error E, StringRef Whence = "") {
  51   if (E.isA<InstrProfError>()) {
  52     handleAllErrors(std::move(E), [&](const InstrProfError &IPE) {
  53       instrprof_error instrError = IPE.get();
  54       StringRef Hint = "";
  55       if (instrError == instrprof_error::unrecognized_format) {
  56         // Hint for common error of forgetting -sample for sample profiles.
  57         Hint = "Perhaps you forgot to use the -sample option?";
  58       }
  59       exitWithError(IPE.message(), Whence, Hint);
  60     });
  61   }
  62
  63   exitWithError(toString(std::move(E)), Whence);
  64 }
  65
  66 static void exitWithErrorCode(std::error_code EC, StringRef Whence = "") {
  67   exitWithError(EC.message(), Whence);
  68 }
  69
  70 namespace {
  71 enum ProfileKinds { instr, sample };
  72 }
  73
  74 static void handleMergeWriterError(Error E, StringRef WhenceFile = "",
  75                                    StringRef WhenceFunction = "",
  76                                    bool ShowHint = true) {
  77   if (!WhenceFile.empty())
  78     errs() << WhenceFile << ": ";
  79   if (!WhenceFunction.empty())
  80     errs() << WhenceFunction << ": ";
  81
  82   auto IPE = instrprof_error::success;
  83   E = handleErrors(std::move(E),
  84                    [&IPE](std::unique_ptr<InstrProfError> E) -> Error {
  85                      IPE = E->get();
  86                      return Error(std::move(E));
  87                    });
  88   errs() << toString(std::move(E)) << "\n";
  89
  90   if (ShowHint) {
  91     StringRef Hint = "";
  92     if (IPE != instrprof_error::success) {
  93       switch (IPE) {
  94       case instrprof_error::hash_mismatch:
  95       case instrprof_error::count_mismatch:
  96       case instrprof_error::value_site_count_mismatch:
  97         Hint = "Make sure that all profile data to be merged is generated "
  98                "from the same binary.";
  99         break;
 100       default:
 101         break;
 102       }
 103     }
 104
 105     if (!Hint.empty())
 106       errs() << Hint << "\n";
 107   }
 108 }
 109
 110 struct WeightedFile {
 111   StringRef Filename;
 112   uint64_t Weight;
 113
 114   WeightedFile() {}
 115
 116   WeightedFile(StringRef F, uint64_t W) : Filename{F}, Weight{W} {}
 117 };
 118 typedef SmallVector<WeightedFile, 5> WeightedFileVector;
 119
 120 static void mergeInstrProfile(const WeightedFileVector &Inputs,
 121                               StringRef OutputFilename,
 122                               ProfileFormat OutputFormat, bool OutputSparse) {
 123   if (OutputFilename.compare("-") == 0)
 124     exitWithError("Cannot write indexed profdata format to stdout.");
 125
 126   if (OutputFormat != PF_Binary && OutputFormat != PF_Text)
 127     exitWithError("Unknown format is specified.");
 128
 129   std::error_code EC;
 130   raw_fd_ostream Output(OutputFilename.data(), EC, sys::fs::F_None);
 131   if (EC)
 132     exitWithErrorCode(EC, OutputFilename);
 133
 134   InstrProfWriter Writer(OutputSparse);
 135   SmallSet<instrprof_error, 4> WriterErrorCodes;
 136   for (const auto &Input : Inputs) {
 137     auto ReaderOrErr = InstrProfReader::create(Input.Filename);
 138     if (Error E = ReaderOrErr.takeError())
 139       exitWithError(std::move(E), Input.Filename);
 140
 141     auto Reader = std::move(ReaderOrErr.get());
 142     bool IsIRProfile = Reader->isIRLevelProfile();
 143     if (Writer.setIsIRLevelProfile(IsIRProfile))
 144       exitWithError("Merge IR generated profile with Clang generated profile.");
 145
 146     for (auto &I : *Reader) {
 147       if (Error E = Writer.addRecord(std::move(I), Input.Weight)) {
 148         // Only show hint the first time an error occurs.
 149         instrprof_error IPE = InstrProfError::take(std::move(E));
 150         bool firstTime = WriterErrorCodes.insert(IPE).second;
 151         handleMergeWriterError(make_error<InstrProfError>(IPE), Input.Filename,
 152                                I.Name, firstTime);
 153       }
 154     }
 155     if (Reader->hasError())
 156       exitWithError(Reader->getError(), Input.Filename);
 157   }
 158   if (OutputFormat == PF_Text)
 159     Writer.writeText(Output);
 160   else
 161     Writer.write(Output);
 162 }
 163
 164 static sampleprof::SampleProfileFormat FormatMap[] = {
 165     sampleprof::SPF_None, sampleprof::SPF_Text, sampleprof::SPF_Binary,
 166     sampleprof::SPF_GCC};
 167
 168 static void mergeSampleProfile(const WeightedFileVector &Inputs,
 169                                StringRef OutputFilename,
 170                                ProfileFormat OutputFormat) {
 171   using namespace sampleprof;
 172   auto WriterOrErr =
 173       SampleProfileWriter::create(OutputFilename, FormatMap[OutputFormat]);
 174   if (std::error_code EC = WriterOrErr.getError())
 175     exitWithErrorCode(EC, OutputFilename);
 176
 177   auto Writer = std::move(WriterOrErr.get());
 178   StringMap<FunctionSamples> ProfileMap;
 179   SmallVector<std::unique_ptr<sampleprof::SampleProfileReader>, 5> Readers;
 180   LLVMContext Context;
 181   for (const auto &Input : Inputs) {
 182     auto ReaderOrErr = SampleProfileReader::create(Input.Filename, Context);
 183     if (std::error_code EC = ReaderOrErr.getError())
 184       exitWithErrorCode(EC, Input.Filename);
 185
 186     // We need to keep the readers around until after all the files are
 187     // read so that we do not lose the function names stored in each
 188     // reader's memory. The function names are needed to write out the
 189     // merged profile map.
 190     Readers.push_back(std::move(ReaderOrErr.get()));
 191     const auto Reader = Readers.back().get();
 192     if (std::error_code EC = Reader->read())
 193       exitWithErrorCode(EC, Input.Filename);
 194
 195     StringMap<FunctionSamples> &Profiles = Reader->getProfiles();
 196     for (StringMap<FunctionSamples>::iterator I = Profiles.begin(),
 197                                               E = Profiles.end();
 198          I != E; ++I) {
 199       StringRef FName = I->first();
 200       FunctionSamples &Samples = I->second;
 201       sampleprof_error Result = ProfileMap[FName].merge(Samples, Input.Weight);
 202       if (Result != sampleprof_error::success) {
 203         std::error_code EC = make_error_code(Result);
 204         handleMergeWriterError(errorCodeToError(EC), Input.Filename, FName);
 205       }
 206     }
 207   }
 208   Writer->write(ProfileMap);
 209 }
 210
 211 static WeightedFile parseWeightedFile(const StringRef &WeightedFilename) {
 212   StringRef WeightStr, FileName;
 213   std::tie(WeightStr, FileName) = WeightedFilename.split(',');
 214
 215   uint64_t Weight;
 216   if (WeightStr.getAsInteger(10, Weight) || Weight < 1)
 217     exitWithError("Input weight must be a positive integer.");
 218
 219   if (!sys::fs::exists(FileName))
 220     exitWithErrorCode(make_error_code(errc::no_such_file_or_directory),
 221                       FileName);
 222
 223   return WeightedFile(FileName, Weight);
 224 }
 225
 226 static std::unique_ptr<MemoryBuffer>
 227 getInputFilenamesFileBuf(const StringRef &InputFilenamesFile) {
 228   if (InputFilenamesFile == "")
 229     return {};
 230
 231   auto BufOrError = MemoryBuffer::getFileOrSTDIN(InputFilenamesFile);
 232   if (!BufOrError)
 233     exitWithErrorCode(BufOrError.getError(), InputFilenamesFile);
 234
 235   return std::move(*BufOrError);
 236 }
 237
 238 static void parseInputFilenamesFile(MemoryBuffer *Buffer,
 239                                     WeightedFileVector &WFV) {
 240   if (!Buffer)
 241     return;
 242
 243   SmallVector<StringRef, 8> Entries;
 244   StringRef Data = Buffer->getBuffer();
 245   Data.split(Entries, '\n', /*MaxSplit=*/-1, /*KeepEmpty=*/false);
 246   for (const StringRef &FileWeightEntry : Entries) {
 247     StringRef SanitizedEntry = FileWeightEntry.trim(" \t\v\f\r");
 248     // Skip comments.
 249     if (SanitizedEntry.startswith("#"))
 250       continue;
 251     // If there's no comma, it's an unweighted profile.
 252     else if (SanitizedEntry.find(',') == StringRef::npos)
 253       WFV.emplace_back(SanitizedEntry, 1);
 254     else
 255       WFV.emplace_back(parseWeightedFile(SanitizedEntry));
 256   }
 257 }
 258
 259 static int merge_main(int argc, const char *argv[]) {
 260   cl::list<std::string> InputFilenames(cl::Positional,
 261                                        cl::desc("<filename...>"));
 262   cl::list<std::string> WeightedInputFilenames("weighted-input",
 263                                                cl::desc("<weight>,<filename>"));
 264   cl::opt<std::string> InputFilenamesFile(
 265       "input-files", cl::init(""),
 266       cl::desc("Path to file containing newline-separated "
 267                "[<weight>,]<filename> entries"));
 268   cl::alias InputFilenamesFileA("f", cl::desc("Alias for --input-files"),
 269                                 cl::aliasopt(InputFilenamesFile));
 270   cl::opt<bool> DumpInputFileList(
 271       "dump-input-file-list", cl::init(false), cl::Hidden,
 272       cl::desc("Dump the list of input files and their weights, then exit"));
 273   cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
 274                                       cl::init("-"), cl::Required,
 275                                       cl::desc("Output file"));
 276   cl::alias OutputFilenameA("o", cl::desc("Alias for --output"),
 277                             cl::aliasopt(OutputFilename));
 278   cl::opt<ProfileKinds> ProfileKind(
 279       cl::desc("Profile kind:"), cl::init(instr),
 280       cl::values(clEnumVal(instr, "Instrumentation profile (default)"),
 281                  clEnumVal(sample, "Sample profile"), clEnumValEnd));
 282   cl::opt<ProfileFormat> OutputFormat(
 283       cl::desc("Format of output profile"), cl::init(PF_Binary),
 284       cl::values(clEnumValN(PF_Binary, "binary", "Binary encoding (default)"),
 285                  clEnumValN(PF_Text, "text", "Text encoding"),
 286                  clEnumValN(PF_GCC, "gcc",
 287                             "GCC encoding (only meaningful for -sample)"),
 288                  clEnumValEnd));
 289   cl::opt<bool> OutputSparse("sparse", cl::init(false),
 290       cl::desc("Generate a sparse profile (only meaningful for -instr)"));
 291
 292   cl::ParseCommandLineOptions(argc, argv, "LLVM profile data merger\n");
 293
 294   WeightedFileVector WeightedInputs;
 295   for (StringRef Filename : InputFilenames)
 296     WeightedInputs.emplace_back(Filename, 1);
 297   for (StringRef WeightedFilename : WeightedInputFilenames)
 298     WeightedInputs.emplace_back(parseWeightedFile(WeightedFilename));
 299
 300   // Make sure that the file buffer stays alive for the duration of the
 301   // weighted input vector's lifetime.
 302   auto Buffer = getInputFilenamesFileBuf(InputFilenamesFile);
 303   parseInputFilenamesFile(Buffer.get(), WeightedInputs);
 304
 305   if (WeightedInputs.empty())
 306     exitWithError("No input files specified. See " +
 307                   sys::path::filename(argv[0]) + " -help");
 308
 309   if (DumpInputFileList) {
 310     for (auto &WF : WeightedInputs)
 311       outs() << WF.Weight << "," << WF.Filename << "\n";
 312     return 0;
 313   }
 314
 315   if (ProfileKind == instr)
 316     mergeInstrProfile(WeightedInputs, OutputFilename, OutputFormat,
 317                       OutputSparse);
 318   else
 319     mergeSampleProfile(WeightedInputs, OutputFilename, OutputFormat);
 320
 321   return 0;
 322 }
 323
 324 static int showInstrProfile(const std::string &Filename, bool ShowCounts,
 325                             bool ShowIndirectCallTargets,
 326                             bool ShowDetailedSummary,
 327                             std::vector<uint32_t> DetailedSummaryCutoffs,
 328                             bool ShowAllFunctions,
 329                             const std::string &ShowFunction, bool TextFormat,
 330                             raw_fd_ostream &OS) {
 331   auto ReaderOrErr = InstrProfReader::create(Filename);
 332   std::vector<uint32_t> Cutoffs = std::move(DetailedSummaryCutoffs);
 333   if (ShowDetailedSummary && Cutoffs.empty()) {
 334     Cutoffs = {800000, 900000, 950000, 990000, 999000, 999900, 999990};
 335   }
 336   InstrProfSummaryBuilder Builder(std::move(Cutoffs));
 337   if (Error E = ReaderOrErr.takeError())
 338     exitWithError(std::move(E), Filename);
 339
 340   auto Reader = std::move(ReaderOrErr.get());
 341   bool IsIRInstr = Reader->isIRLevelProfile();
 342   size_t ShownFunctions = 0;
 343   uint64_t TotalNumValueSites = 0;
 344   uint64_t TotalNumValueSitesWithValueProfile = 0;
 345   uint64_t TotalNumValues = 0;
 346   for (const auto &Func : *Reader) {
 347     bool Show =
 348         ShowAllFunctions || (!ShowFunction.empty() &&
 349                              Func.Name.find(ShowFunction) != Func.Name.npos);
 350
 351     bool doTextFormatDump = (Show && ShowCounts && TextFormat);
 352
 353     if (doTextFormatDump) {
 354       InstrProfSymtab &Symtab = Reader->getSymtab();
 355       InstrProfWriter::writeRecordInText(Func, Symtab, OS);
 356       continue;
 357     }
 358
 359     assert(Func.Counts.size() > 0 && "function missing entry counter");
 360     Builder.addRecord(Func);
 361
 362     if (Show) {
 363
 364       if (!ShownFunctions)
 365         OS << "Counters:\n";
 366
 367       ++ShownFunctions;
 368
 369       OS << "  " << Func.Name << ":\n"
 370          << "    Hash: " << format("0x%016" PRIx64, Func.Hash) << "\n"
 371          << "    Counters: " << Func.Counts.size() << "\n";
 372       if (!IsIRInstr)
 373         OS << "    Function count: " << Func.Counts[0] << "\n";
 374
 375       if (ShowIndirectCallTargets)
 376         OS << "    Indirect Call Site Count: "
 377            << Func.getNumValueSites(IPVK_IndirectCallTarget) << "\n";
 378
 379       if (ShowCounts) {
 380         OS << "    Block counts: [";
 381         size_t Start = (IsIRInstr ? 0 : 1);
 382         for (size_t I = Start, E = Func.Counts.size(); I < E; ++I) {
 383           OS << (I == Start ? "" : ", ") << Func.Counts[I];
 384         }
 385         OS << "]\n";
 386       }
 387
 388       if (ShowIndirectCallTargets) {
 389         InstrProfSymtab &Symtab = Reader->getSymtab();
 390         uint32_t NS = Func.getNumValueSites(IPVK_IndirectCallTarget);
 391         OS << "    Indirect Target Results: \n";
 392         TotalNumValueSites += NS;
 393         for (size_t I = 0; I < NS; ++I) {
 394           uint32_t NV = Func.getNumValueDataForSite(IPVK_IndirectCallTarget, I);
 395           std::unique_ptr<InstrProfValueData[]> VD =
 396               Func.getValueForSite(IPVK_IndirectCallTarget, I);
 397           TotalNumValues += NV;
 398           if (NV)
 399             TotalNumValueSitesWithValueProfile++;
 400           for (uint32_t V = 0; V < NV; V++) {
 401             OS << "\t[ " << I << ", ";
 402             OS << Symtab.getFuncName(VD[V].Value) << ", " << VD[V].Count
 403                << " ]\n";
 404           }
 405         }
 406       }
 407     }
 408   }
 409   if (Reader->hasError())
 410     exitWithError(Reader->getError(), Filename);
 411
 412   if (ShowCounts && TextFormat)
 413     return 0;
 414   std::unique_ptr<ProfileSummary> PS(Builder.getSummary());
 415   if (ShowAllFunctions || !ShowFunction.empty())
 416     OS << "Functions shown: " << ShownFunctions << "\n";
 417   OS << "Total functions: " << PS->getNumFunctions() << "\n";
 418   OS << "Maximum function count: " << PS->getMaxFunctionCount() << "\n";
 419   OS << "Maximum internal block count: " << PS->getMaxInternalCount() << "\n";
 420   if (ShownFunctions && ShowIndirectCallTargets) {
 421     OS << "Total Number of Indirect Call Sites : " << TotalNumValueSites
 422        << "\n";
 423     OS << "Total Number of Sites With Values : "
 424        << TotalNumValueSitesWithValueProfile << "\n";
 425     OS << "Total Number of Profiled Values : " << TotalNumValues << "\n";
 426   }
 427
 428   if (ShowDetailedSummary) {
 429     OS << "Detailed summary:\n";
 430     OS << "Total number of blocks: " << PS->getNumCounts() << "\n";
 431     OS << "Total count: " << PS->getTotalCount() << "\n";
 432     for (auto Entry : PS->getDetailedSummary()) {
 433       OS << Entry.NumCounts << " blocks with count >= " << Entry.MinCount
 434          << " account for "
 435          << format("%0.6g", (float)Entry.Cutoff / ProfileSummary::Scale * 100)
 436          << " percentage of the total counts.\n";
 437     }
 438   }
 439   return 0;
 440 }
 441
 442 static int showSampleProfile(const std::string &Filename, bool ShowCounts,
 443                              bool ShowAllFunctions,
 444                              const std::string &ShowFunction,
 445                              raw_fd_ostream &OS) {
 446   using namespace sampleprof;
 447   LLVMContext Context;
 448   auto ReaderOrErr = SampleProfileReader::create(Filename, Context);
 449   if (std::error_code EC = ReaderOrErr.getError())
 450     exitWithErrorCode(EC, Filename);
 451
 452   auto Reader = std::move(ReaderOrErr.get());
 453   if (std::error_code EC = Reader->read())
 454     exitWithErrorCode(EC, Filename);
 455
 456   if (ShowAllFunctions || ShowFunction.empty())
 457     Reader->dump(OS);
 458   else
 459     Reader->dumpFunctionProfile(ShowFunction, OS);
 460
 461   return 0;
 462 }
 463
 464 static int show_main(int argc, const char *argv[]) {
 465   cl::opt<std::string> Filename(cl::Positional, cl::Required,
 466                                 cl::desc("<profdata-file>"));
 467
 468   cl::opt<bool> ShowCounts("counts", cl::init(false),
 469                            cl::desc("Show counter values for shown functions"));
 470   cl::opt<bool> TextFormat(
 471       "text", cl::init(false),
 472       cl::desc("Show instr profile data in text dump format"));
 473   cl::opt<bool> ShowIndirectCallTargets(
 474       "ic-targets", cl::init(false),
 475       cl::desc("Show indirect call site target values for shown functions"));
 476   cl::opt<bool> ShowDetailedSummary("detailed-summary", cl::init(false),
 477                                     cl::desc("Show detailed profile summary"));
 478   cl::list<uint32_t> DetailedSummaryCutoffs(
 479       cl::CommaSeparated, "detailed-summary-cutoffs",
 480       cl::desc(
 481           "Cutoff percentages (times 10000) for generating detailed summary"),
 482       cl::value_desc("800000,901000,999999"));
 483   cl::opt<bool> ShowAllFunctions("all-functions", cl::init(false),
 484                                  cl::desc("Details for every function"));
 485   cl::opt<std::string> ShowFunction("function",
 486                                     cl::desc("Details for matching functions"));
 487
 488   cl::opt<std::string> OutputFilename("output", cl::value_desc("output"),
 489                                       cl::init("-"), cl::desc("Output file"));
 490   cl::alias OutputFilenameA("o", cl::desc("Alias for --output"),
 491                             cl::aliasopt(OutputFilename));
 492   cl::opt<ProfileKinds> ProfileKind(
 493       cl::desc("Profile kind:"), cl::init(instr),
 494       cl::values(clEnumVal(instr, "Instrumentation profile (default)"),
 495                  clEnumVal(sample, "Sample profile"), clEnumValEnd));
 496
 497   cl::ParseCommandLineOptions(argc, argv, "LLVM profile data summary\n");
 498
 499   if (OutputFilename.empty())
 500     OutputFilename = "-";
 501
 502   std::error_code EC;
 503   raw_fd_ostream OS(OutputFilename.data(), EC, sys::fs::F_Text);
 504   if (EC)
 505     exitWithErrorCode(EC, OutputFilename);
 506
 507   if (ShowAllFunctions && !ShowFunction.empty())
 508     errs() << "warning: -function argument ignored: showing all functions\n";
 509
 510   std::vector<uint32_t> Cutoffs(DetailedSummaryCutoffs.begin(),
 511                                 DetailedSummaryCutoffs.end());
 512   if (ProfileKind == instr)
 513     return showInstrProfile(Filename, ShowCounts, ShowIndirectCallTargets,
 514                             ShowDetailedSummary, DetailedSummaryCutoffs,
 515                             ShowAllFunctions, ShowFunction, TextFormat, OS);
 516   else
 517     return showSampleProfile(Filename, ShowCounts, ShowAllFunctions,
 518                              ShowFunction, OS);
 519 }
 520
 521 int main(int argc, const char *argv[]) {
 522   // Print a stack trace if we signal out.
 523   sys::PrintStackTraceOnErrorSignal(argv[0]);
 524   PrettyStackTraceProgram X(argc, argv);
 525   llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
 526
 527   StringRef ProgName(sys::path::filename(argv[0]));
 528   if (argc > 1) {
 529     int (*func)(int, const char *[]) = nullptr;
 530
 531     if (strcmp(argv[1], "merge") == 0)
 532       func = merge_main;
 533     else if (strcmp(argv[1], "show") == 0)
 534       func = show_main;
 535
 536     if (func) {
 537       std::string Invocation(ProgName.str() + " " + argv[1]);
 538       argv[1] = Invocation.c_str();
 539       return func(argc - 1, argv + 1);
 540     }
 541
 542     if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "-help") == 0 ||
 543         strcmp(argv[1], "--help") == 0) {
 544
 545       errs() << "OVERVIEW: LLVM profile data tools\n\n"
 546              << "USAGE: " << ProgName << " <command> [args...]\n"
 547              << "USAGE: " << ProgName << " <command> -help\n\n"
 548              << "Available commands: merge, show\n";
 549       return 0;
 550     }
 551   }
 552
 553   if (argc < 2)
 554     errs() << ProgName << ": No command specified!\n";
 555   else
 556     errs() << ProgName << ": Unknown command!\n";
 557
 558   errs() << "USAGE: " << ProgName << " <merge|show> [args...]\n";
 559   return 1;
 560 }