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
exitWithError(const Twine & Message,StringRef Whence="",StringRef Hint="")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
exitWithError(Error E,StringRef Whence="")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
exitWithErrorCode(std::error_code EC,StringRef Whence="")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
handleMergeWriterError(Error E,StringRef WhenceFile="",StringRef WhenceFunction="",bool ShowHint=true)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
WeightedFileWeightedFile114 WeightedFile() {}
115
WeightedFileWeightedFile116 WeightedFile(StringRef F, uint64_t W) : Filename{F}, Weight{W} {}
117 };
118 typedef SmallVector<WeightedFile, 5> WeightedFileVector;
119
mergeInstrProfile(const WeightedFileVector & Inputs,StringRef OutputFilename,ProfileFormat OutputFormat,bool OutputSparse)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
mergeSampleProfile(const WeightedFileVector & Inputs,StringRef OutputFilename,ProfileFormat OutputFormat)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
parseWeightedFile(const StringRef & WeightedFilename)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>
getInputFilenamesFileBuf(const StringRef & InputFilenamesFile)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
parseInputFilenamesFile(MemoryBuffer * Buffer,WeightedFileVector & WFV)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
merge_main(int argc,const char * argv[])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
showInstrProfile(const std::string & Filename,bool ShowCounts,bool ShowIndirectCallTargets,bool ShowDetailedSummary,std::vector<uint32_t> DetailedSummaryCutoffs,bool ShowAllFunctions,const std::string & ShowFunction,bool TextFormat,raw_fd_ostream & OS)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
showSampleProfile(const std::string & Filename,bool ShowCounts,bool ShowAllFunctions,const std::string & ShowFunction,raw_fd_ostream & OS)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
show_main(int argc,const char * argv[])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
main(int argc,const char * argv[])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 }
561