clang-tidy/tool/ClangTidyMain.cpp - clang-tools-extra - Git at Google

 //===--- tools/extra/clang-tidy/ClangTidyMain.cpp - Clang tidy tool -------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 ///  \file This file implements a clang-tidy tool.
 ///
 ///  This tool uses the Clang Tooling infrastructure, see
 ///    http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
 ///  for details on setting it up with LLVM source tree.
 ///
 //===----------------------------------------------------------------------===//

 #include "../ClangTidy.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "llvm/Support/Process.h"

 using namespace clang::ast_matchers;
 using namespace clang::driver;
 using namespace clang::tooling;
 using namespace llvm;

 static cl::OptionCategory ClangTidyCategory("clang-tidy options");

 static cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage);
 static cl::extrahelp ClangTidyHelp(
     "Configuration files:\n"
     "  clang-tidy attempts to read configuration for each source file from a\n"
     "  .clang-tidy file located in the closest parent directory of the source\n"
     "  file. If any configuration options have a corresponding command-line\n"
     "  option, command-line option takes precedence. The effective\n"
     "  configuration can be inspected using -dump-config:\n"
     "\n"
     "    $ clang-tidy -dump-config - --\n"
     "    ---\n"
     "    Checks:          '-*,some-check'\n"
     "    HeaderFilterRegex: ''\n"
     "    AnalyzeTemporaryDtors: false\n"
     "    User:            user\n"
     "    CheckOptions:    \n"
     "      - key:             some-check.SomeOption\n"
     "        value:           'some value'\n"
     "    ...\n"
     "\n\n");

 const char DefaultChecks[] =  // Enable these checks:
     "clang-diagnostic-*,"     //   * compiler diagnostics
     "clang-analyzer-*,"       //   * Static Analyzer checks
     "-clang-analyzer-alpha*"; //   * but not alpha checks: many false positives

 static cl::opt<std::string>
 Checks("checks", cl::desc("Comma-separated list of globs with optional '-'\n"
                           "prefix. Globs are processed in order of appearance\n"
                           "in the list. Globs without '-' prefix add checks\n"
                           "with matching names to the set, globs with the '-'\n"
                           "prefix remove checks with matching names from the\n"
                           "set of enabled checks.\n"
                           "This option's value is appended to the value read\n"
                           "from a .clang-tidy file, if any."),
        cl::init(""), cl::cat(ClangTidyCategory));

 static cl::opt<std::string>
 HeaderFilter("header-filter",
              cl::desc("Regular expression matching the names of the\n"
                       "headers to output diagnostics from. Diagnostics\n"
                       "from the main file of each translation unit are\n"
                       "always displayed.\n"
                       "Can be used together with -line-filter.\n"
                       "This option overrides the value read from a\n"
                       ".clang-tidy file."),
              cl::init(""), cl::cat(ClangTidyCategory));

 static cl::opt<bool>
     SystemHeaders("system-headers",
                   cl::desc("Display the errors from system headers."),
                   cl::init(false), cl::cat(ClangTidyCategory));
 static cl::opt<std::string>
 LineFilter("line-filter",
            cl::desc("List of files with line ranges to filter the\n"
                     "warnings. Can be used together with\n"
                     "-header-filter. The format of the list is a JSON\n"
                     "array of objects:\n"
                     "  [\n"
                     "    {\"name\":\"file1.cpp\",\"lines\":[[1,3],[5,7]]},\n"
                     "    {\"name\":\"file2.h\"}\n"
                     "  ]"),
            cl::init(""), cl::cat(ClangTidyCategory));

 static cl::opt<bool>
     Fix("fix", cl::desc("Apply suggested fixes. Without -fix-errors\n"
                         "clang-tidy will bail out if any compilation\n"
                         "errors were found."),
         cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<bool>
     FixErrors("fix-errors",
               cl::desc("Apply suggested fixes even if compilation errors\n"
                        "were found. If compiler errors have attached\n"
                        "fix-its, clang-tidy will apply them as well."),
               cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<bool>
 ListChecks("list-checks",
            cl::desc("List all enabled checks and exit. Use with\n"
                     "-checks=* to list all available checks."),
            cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<std::string> Config(
     "config",
     cl::desc("Specifies a configuration in YAML/JSON format:\n"
              "  -config=\"{Checks: '*', CheckOptions: [{key: x, value: y}]}\"\n"
              "When the value is empty, clang-tidy will attempt to find\n"
              "a file named .clang-tidy for each source file in its parent\n"
              "directories."),
     cl::init(""), cl::cat(ClangTidyCategory));

 static cl::opt<bool> DumpConfig(
     "dump-config",
     cl::desc("Dumps configuration in the YAML format to stdout. This option\n"
              "can be used along with a file name (and '--' if the file is\n"
              "outside of a project with configured compilation database). The\n"
              "configuration used for this file will be printed.\n"
              "Use along with -checks=* to include configuration of all\n"
              "checks.\n"),
     cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<bool> EnableCheckProfile(
     "enable-check-profile",
     cl::desc("Enable per-check timing profiles, and print a report to stderr."),
     cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<bool> AnalyzeTemporaryDtors(
     "analyze-temporary-dtors",
     cl::desc("Enable temporary destructor-aware analysis in\n"
              "clang-analyzer- checks.\n"
              "This option overrides the value read from a\n"
              ".clang-tidy file."),
     cl::init(false), cl::cat(ClangTidyCategory));

 static cl::opt<std::string> ExportFixes(
     "export-fixes",
     cl::desc("YAML file to store suggested fixes in. The\n"
              "stored fixes can be applied to the input source\n"
              "code with clang-apply-replacements."),
     cl::value_desc("filename"), cl::cat(ClangTidyCategory));

 namespace clang {
 namespace tidy {

 static void printStats(const ClangTidyStats &Stats) {
   if (Stats.errorsIgnored()) {
     llvm::errs() << "Suppressed " << Stats.errorsIgnored() << " warnings (";
     StringRef Separator = "";
     if (Stats.ErrorsIgnoredNonUserCode) {
       llvm::errs() << Stats.ErrorsIgnoredNonUserCode << " in non-user code";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredLineFilter) {
       llvm::errs() << Separator << Stats.ErrorsIgnoredLineFilter
                    << " due to line filter";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredNOLINT) {
       llvm::errs() << Separator << Stats.ErrorsIgnoredNOLINT << " NOLINT";
       Separator = ", ";
     }
     if (Stats.ErrorsIgnoredCheckFilter)
       llvm::errs() << Separator << Stats.ErrorsIgnoredCheckFilter
                    << " with check filters";
     llvm::errs() << ").\n";
     if (Stats.ErrorsIgnoredNonUserCode)
       llvm::errs() << "Use -header-filter=.* to display errors from all "
                       "non-system headers.\n";
   }
 }

 static void printProfileData(const ProfileData &Profile,
                              llvm::raw_ostream &OS) {
   // Time is first to allow for sorting by it.
   std::vector<std::pair<llvm::TimeRecord, StringRef>> Timers;
   TimeRecord Total;

   for (const auto& P : Profile.Records) {
     Timers.emplace_back(P.getValue(), P.getKey());
     Total += P.getValue();
   }

   std::sort(Timers.begin(), Timers.end());

   std::string Line = "===" + std::string(73, '-') + "===\n";
   OS << Line;

   if (Total.getUserTime())
     OS << "   ---User Time---";
   if (Total.getSystemTime())
     OS << "   --System Time--";
   if (Total.getProcessTime())
     OS << "   --User+System--";
   OS << "   ---Wall Time---";
   if (Total.getMemUsed())
     OS << "  ---Mem---";
   OS << "  --- Name ---\n";

   // Loop through all of the timing data, printing it out.
   for (auto I = Timers.rbegin(), E = Timers.rend(); I != E; ++I) {
     I->first.print(Total, OS);
     OS << I->second << '\n';
   }

   Total.print(Total, OS);
   OS << "Total\n";
   OS << Line << "\n";
   OS.flush();
 }

 static std::unique_ptr<ClangTidyOptionsProvider> createOptionsProvider() {
   ClangTidyGlobalOptions GlobalOptions;
   if (std::error_code Err = parseLineFilter(LineFilter, GlobalOptions)) {
     llvm::errs() << "Invalid LineFilter: " << Err.message() << "\n\nUsage:\n";
     llvm::cl::PrintHelpMessage(/*Hidden=*/false, /*Categorized=*/true);
     return nullptr;
   }

   ClangTidyOptions DefaultOptions;
   DefaultOptions.Checks = DefaultChecks;
   DefaultOptions.HeaderFilterRegex = HeaderFilter;
   DefaultOptions.SystemHeaders = SystemHeaders;
   DefaultOptions.AnalyzeTemporaryDtors = AnalyzeTemporaryDtors;
   DefaultOptions.User = llvm::sys::Process::GetEnv("USER");
   // USERNAME is used on Windows.
   if (!DefaultOptions.User)
     DefaultOptions.User = llvm::sys::Process::GetEnv("USERNAME");

   ClangTidyOptions OverrideOptions;
   if (Checks.getNumOccurrences() > 0)
     OverrideOptions.Checks = Checks;
   if (HeaderFilter.getNumOccurrences() > 0)
     OverrideOptions.HeaderFilterRegex = HeaderFilter;
   if (SystemHeaders.getNumOccurrences() > 0)
     OverrideOptions.SystemHeaders = SystemHeaders;
   if (AnalyzeTemporaryDtors.getNumOccurrences() > 0)
     OverrideOptions.AnalyzeTemporaryDtors = AnalyzeTemporaryDtors;

   if (!Config.empty()) {
     if (llvm::ErrorOr<ClangTidyOptions> ParsedConfig =
             parseConfiguration(Config)) {
       return llvm::make_unique<DefaultOptionsProvider>(
           GlobalOptions, ClangTidyOptions::getDefaults()
                              .mergeWith(DefaultOptions)
                              .mergeWith(*ParsedConfig)
                              .mergeWith(OverrideOptions));
     } else {
       llvm::errs() << "Error: invalid configuration specified.\n"
                    << ParsedConfig.getError().message() << "\n";
       return nullptr;
     }
   }
   return llvm::make_unique<FileOptionsProvider>(GlobalOptions, DefaultOptions,
                                                 OverrideOptions);
 }

 static int clangTidyMain(int argc, const char **argv) {
   CommonOptionsParser OptionsParser(argc, argv, ClangTidyCategory,
                                     cl::ZeroOrMore);

   auto OptionsProvider = createOptionsProvider();
   if (!OptionsProvider)
     return 1;

   StringRef FileName("dummy");
   auto PathList = OptionsParser.getSourcePathList();
   if (!PathList.empty()) {
     FileName = PathList.front();
   }
   ClangTidyOptions EffectiveOptions = OptionsProvider->getOptions(FileName);
   std::vector<std::string> EnabledChecks = getCheckNames(EffectiveOptions);

   if (ListChecks) {
     llvm::outs() << "Enabled checks:";
     for (auto CheckName : EnabledChecks)
       llvm::outs() << "\n    " << CheckName;
     llvm::outs() << "\n\n";
     return 0;
   }

   if (DumpConfig) {
     EffectiveOptions.CheckOptions = getCheckOptions(EffectiveOptions);
     llvm::outs() << configurationAsText(
                         ClangTidyOptions::getDefaults().mergeWith(
                             EffectiveOptions))
                  << "\n";
     return 0;
   }

   if (EnabledChecks.empty()) {
     llvm::errs() << "Error: no checks enabled.\n";
     llvm::cl::PrintHelpMessage(/*Hidden=*/false, /*Categorized=*/true);
     return 1;
   }

   if (PathList.empty()) {
     llvm::errs() << "Error: no input files specified.\n";
     llvm::cl::PrintHelpMessage(/*Hidden=*/false, /*Categorized=*/true);
     return 1;
   }

   ProfileData Profile;

   std::vector<ClangTidyError> Errors;
   ClangTidyStats Stats =
       runClangTidy(std::move(OptionsProvider), OptionsParser.getCompilations(),
                    PathList, &Errors,
                    EnableCheckProfile ? &Profile : nullptr);
   bool FoundErrors =
       std::find_if(Errors.begin(), Errors.end(), [](const ClangTidyError &E) {
         return E.DiagLevel == ClangTidyError::Error;
       }) != Errors.end();

   const bool DisableFixes = Fix && FoundErrors && !FixErrors;

   // -fix-errors implies -fix.
   handleErrors(Errors, (FixErrors || Fix) && !DisableFixes);

   if (!ExportFixes.empty() && !Errors.empty()) {
     std::error_code EC;
     llvm::raw_fd_ostream OS(ExportFixes, EC, llvm::sys::fs::F_None);
     if (EC) {
       llvm::errs() << "Error opening output file: " << EC.message() << '\n';
       return 1;
     }
     exportReplacements(Errors, OS);
   }

   printStats(Stats);
   if (DisableFixes)
     llvm::errs()
         << "Found compiler errors, but -fix-errors was not specified.\n"
            "Fixes have NOT been applied.\n\n";

   if (EnableCheckProfile)
     printProfileData(Profile, llvm::errs());

   return 0;
 }

 // This anchor is used to force the linker to link the CERTModule.
 extern volatile int CERTModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED CERTModuleAnchorDestination =
     CERTModuleAnchorSource;

 // This anchor is used to force the linker to link the LLVMModule.
 extern volatile int LLVMModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED LLVMModuleAnchorDestination =
     LLVMModuleAnchorSource;

 // This anchor is used to force the linker to link the CppCoreGuidelinesModule.
 extern volatile int CppCoreGuidelinesModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED CppCoreGuidelinesModuleAnchorDestination =
     CppCoreGuidelinesModuleAnchorSource;

 // This anchor is used to force the linker to link the GoogleModule.
 extern volatile int GoogleModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED GoogleModuleAnchorDestination =
     GoogleModuleAnchorSource;

 // This anchor is used to force the linker to link the MiscModule.
 extern volatile int MiscModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED MiscModuleAnchorDestination =
     MiscModuleAnchorSource;

 // This anchor is used to force the linker to link the ModernizeModule.
 extern volatile int ModernizeModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED ModernizeModuleAnchorDestination =
     ModernizeModuleAnchorSource;

 // This anchor is used to force the linker to link the PerformanceModule.
 extern volatile int PerformanceModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED PerformanceModuleAnchorDestination =
     PerformanceModuleAnchorSource;

 // This anchor is used to force the linker to link the ReadabilityModule.
 extern volatile int ReadabilityModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED ReadabilityModuleAnchorDestination =
     ReadabilityModuleAnchorSource;

 } // namespace tidy
 } // namespace clang

 int main(int argc, const char **argv) {
   return clang::tidy::clangTidyMain(argc, argv);
 }
	//===--- tools/extra/clang-tidy/ClangTidyMain.cpp - Clang tidy tool -------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	///
	/// \file This file implements a clang-tidy tool.
	///
	/// This tool uses the Clang Tooling infrastructure, see
	/// http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html
	/// for details on setting it up with LLVM source tree.
	///
	//===----------------------------------------------------------------------===//

	#include "../ClangTidy.h"
	#include "clang/Tooling/CommonOptionsParser.h"
	#include "llvm/Support/Process.h"

	using namespace clang::ast_matchers;
	using namespace clang::driver;
	using namespace clang::tooling;
	using namespace llvm;

	static cl::OptionCategory ClangTidyCategory("clang-tidy options");

	static cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage);
	static cl::extrahelp ClangTidyHelp(
	"Configuration files:\n"
	" clang-tidy attempts to read configuration for each source file from a\n"
	" .clang-tidy file located in the closest parent directory of the source\n"
	" file. If any configuration options have a corresponding command-line\n"
	" option, command-line option takes precedence. The effective\n"
	" configuration can be inspected using -dump-config:\n"
	"\n"
	" $ clang-tidy -dump-config - --\n"
	" ---\n"
	" Checks: '-*,some-check'\n"
	" HeaderFilterRegex: ''\n"
	" AnalyzeTemporaryDtors: false\n"
	" User: user\n"
	" CheckOptions: \n"
	" - key: some-check.SomeOption\n"
	" value: 'some value'\n"
	" ...\n"
	"\n\n");

	const char DefaultChecks[] = // Enable these checks:
	"clang-diagnostic-," // compiler diagnostics
	"clang-analyzer-," // Static Analyzer checks
	"-clang-analyzer-alpha"; // but not alpha checks: many false positives

	static cl::opt<std::string>
	Checks("checks", cl::desc("Comma-separated list of globs with optional '-'\n"
	"prefix. Globs are processed in order of appearance\n"
	"in the list. Globs without '-' prefix add checks\n"
	"with matching names to the set, globs with the '-'\n"
	"prefix remove checks with matching names from the\n"
	"set of enabled checks.\n"
	"This option's value is appended to the value read\n"
	"from a .clang-tidy file, if any."),
	cl::init(""), cl::cat(ClangTidyCategory));

	static cl::opt<std::string>
	HeaderFilter("header-filter",
	cl::desc("Regular expression matching the names of the\n"
	"headers to output diagnostics from. Diagnostics\n"
	"from the main file of each translation unit are\n"
	"always displayed.\n"
	"Can be used together with -line-filter.\n"
	"This option overrides the value read from a\n"
	".clang-tidy file."),
	cl::init(""), cl::cat(ClangTidyCategory));

	static cl::opt<bool>
	SystemHeaders("system-headers",
	cl::desc("Display the errors from system headers."),
	cl::init(false), cl::cat(ClangTidyCategory));
	static cl::opt<std::string>
	LineFilter("line-filter",
	cl::desc("List of files with line ranges to filter the\n"
	"warnings. Can be used together with\n"
	"-header-filter. The format of the list is a JSON\n"
	"array of objects:\n"
	" [\n"
	" {\"name\":\"file1.cpp\",\"lines\":[[1,3],[5,7]]},\n"
	" {\"name\":\"file2.h\"}\n"
	" ]"),
	cl::init(""), cl::cat(ClangTidyCategory));

	static cl::opt<bool>
	Fix("fix", cl::desc("Apply suggested fixes. Without -fix-errors\n"
	"clang-tidy will bail out if any compilation\n"
	"errors were found."),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<bool>
	FixErrors("fix-errors",
	cl::desc("Apply suggested fixes even if compilation errors\n"
	"were found. If compiler errors have attached\n"
	"fix-its, clang-tidy will apply them as well."),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<bool>
	ListChecks("list-checks",
	cl::desc("List all enabled checks and exit. Use with\n"
	"-checks=* to list all available checks."),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<std::string> Config(
	"config",
	cl::desc("Specifies a configuration in YAML/JSON format:\n"
	" -config=\"{Checks: '*', CheckOptions: [{key: x, value: y}]}\"\n"
	"When the value is empty, clang-tidy will attempt to find\n"
	"a file named .clang-tidy for each source file in its parent\n"
	"directories."),
	cl::init(""), cl::cat(ClangTidyCategory));

	static cl::opt<bool> DumpConfig(
	"dump-config",
	cl::desc("Dumps configuration in the YAML format to stdout. This option\n"
	"can be used along with a file name (and '--' if the file is\n"
	"outside of a project with configured compilation database). The\n"
	"configuration used for this file will be printed.\n"
	"Use along with -checks=* to include configuration of all\n"
	"checks.\n"),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<bool> EnableCheckProfile(
	"enable-check-profile",
	cl::desc("Enable per-check timing profiles, and print a report to stderr."),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<bool> AnalyzeTemporaryDtors(
	"analyze-temporary-dtors",
	cl::desc("Enable temporary destructor-aware analysis in\n"
	"clang-analyzer- checks.\n"
	"This option overrides the value read from a\n"
	".clang-tidy file."),
	cl::init(false), cl::cat(ClangTidyCategory));

	static cl::opt<std::string> ExportFixes(
	"export-fixes",
	cl::desc("YAML file to store suggested fixes in. The\n"
	"stored fixes can be applied to the input source\n"
	"code with clang-apply-replacements."),
	cl::value_desc("filename"), cl::cat(ClangTidyCategory));

	namespace clang {
	namespace tidy {

	static void printStats(const ClangTidyStats &Stats) {
	if (Stats.errorsIgnored()) {
	llvm::errs() << "Suppressed " << Stats.errorsIgnored() << " warnings (";
	StringRef Separator = "";
	if (Stats.ErrorsIgnoredNonUserCode) {
	llvm::errs() << Stats.ErrorsIgnoredNonUserCode << " in non-user code";
	Separator = ", ";
	}
	if (Stats.ErrorsIgnoredLineFilter) {
	llvm::errs() << Separator << Stats.ErrorsIgnoredLineFilter
	<< " due to line filter";
	Separator = ", ";
	}
	if (Stats.ErrorsIgnoredNOLINT) {
	llvm::errs() << Separator << Stats.ErrorsIgnoredNOLINT << " NOLINT";
	Separator = ", ";
	}
	if (Stats.ErrorsIgnoredCheckFilter)
	llvm::errs() << Separator << Stats.ErrorsIgnoredCheckFilter
	<< " with check filters";
	llvm::errs() << ").\n";
	if (Stats.ErrorsIgnoredNonUserCode)
	llvm::errs() << "Use -header-filter=.* to display errors from all "
	"non-system headers.\n";
	}
	}

	static void printProfileData(const ProfileData &Profile,
	llvm::raw_ostream &OS) {
	// Time is first to allow for sorting by it.
	std::vector<std::pair<llvm::TimeRecord, StringRef>> Timers;
	TimeRecord Total;

	for (const auto& P : Profile.Records) {
	Timers.emplace_back(P.getValue(), P.getKey());
	Total += P.getValue();
	}

	std::sort(Timers.begin(), Timers.end());

	std::string Line = "===" + std::string(73, '-') + "===\n";
	OS << Line;

	if (Total.getUserTime())
	OS << " ---User Time---";
	if (Total.getSystemTime())
	OS << " --System Time--";
	if (Total.getProcessTime())
	OS << " --User+System--";
	OS << " ---Wall Time---";
	if (Total.getMemUsed())
	OS << " ---Mem---";
	OS << " --- Name ---\n";

	// Loop through all of the timing data, printing it out.
	for (auto I = Timers.rbegin(), E = Timers.rend(); I != E; ++I) {
	I->first.print(Total, OS);
	OS << I->second << '\n';
	}

	Total.print(Total, OS);
	OS << "Total\n";
	OS << Line << "\n";
	OS.flush();
	}

	static std::unique_ptr<ClangTidyOptionsProvider> createOptionsProvider() {
	ClangTidyGlobalOptions GlobalOptions;
	if (std::error_code Err = parseLineFilter(LineFilter, GlobalOptions)) {
	llvm::errs() << "Invalid LineFilter: " << Err.message() << "\n\nUsage:\n";
	llvm::cl::PrintHelpMessage(/Hidden=/false, /Categorized=/true);
	return nullptr;
	}

	ClangTidyOptions DefaultOptions;
	DefaultOptions.Checks = DefaultChecks;
	DefaultOptions.HeaderFilterRegex = HeaderFilter;
	DefaultOptions.SystemHeaders = SystemHeaders;
	DefaultOptions.AnalyzeTemporaryDtors = AnalyzeTemporaryDtors;
	DefaultOptions.User = llvm::sys::Process::GetEnv("USER");
	// USERNAME is used on Windows.
	if (!DefaultOptions.User)
	DefaultOptions.User = llvm::sys::Process::GetEnv("USERNAME");

	ClangTidyOptions OverrideOptions;
	if (Checks.getNumOccurrences() > 0)
	OverrideOptions.Checks = Checks;
	if (HeaderFilter.getNumOccurrences() > 0)
	OverrideOptions.HeaderFilterRegex = HeaderFilter;
	if (SystemHeaders.getNumOccurrences() > 0)
	OverrideOptions.SystemHeaders = SystemHeaders;
	if (AnalyzeTemporaryDtors.getNumOccurrences() > 0)
	OverrideOptions.AnalyzeTemporaryDtors = AnalyzeTemporaryDtors;

	if (!Config.empty()) {
	if (llvm::ErrorOr<ClangTidyOptions> ParsedConfig =
	parseConfiguration(Config)) {
	return llvm::make_unique<DefaultOptionsProvider>(
	GlobalOptions, ClangTidyOptions::getDefaults()
	.mergeWith(DefaultOptions)
	.mergeWith(*ParsedConfig)
	.mergeWith(OverrideOptions));
	} else {
	llvm::errs() << "Error: invalid configuration specified.\n"
	<< ParsedConfig.getError().message() << "\n";
	return nullptr;
	}
	}
	return llvm::make_unique<FileOptionsProvider>(GlobalOptions, DefaultOptions,
	OverrideOptions);
	}

	static int clangTidyMain(int argc, const char **argv) {
	CommonOptionsParser OptionsParser(argc, argv, ClangTidyCategory,
	cl::ZeroOrMore);

	auto OptionsProvider = createOptionsProvider();
	if (!OptionsProvider)
	return 1;

	StringRef FileName("dummy");
	auto PathList = OptionsParser.getSourcePathList();
	if (!PathList.empty()) {
	FileName = PathList.front();
	}
	ClangTidyOptions EffectiveOptions = OptionsProvider->getOptions(FileName);
	std::vector<std::string> EnabledChecks = getCheckNames(EffectiveOptions);

	if (ListChecks) {
	llvm::outs() << "Enabled checks:";
	for (auto CheckName : EnabledChecks)
	llvm::outs() << "\n " << CheckName;
	llvm::outs() << "\n\n";
	return 0;
	}

	if (DumpConfig) {
	EffectiveOptions.CheckOptions = getCheckOptions(EffectiveOptions);
	llvm::outs() << configurationAsText(
	ClangTidyOptions::getDefaults().mergeWith(
	EffectiveOptions))
	<< "\n";
	return 0;
	}

	if (EnabledChecks.empty()) {
	llvm::errs() << "Error: no checks enabled.\n";
	llvm::cl::PrintHelpMessage(/Hidden=/false, /Categorized=/true);
	return 1;
	}

	if (PathList.empty()) {
	llvm::errs() << "Error: no input files specified.\n";
	llvm::cl::PrintHelpMessage(/Hidden=/false, /Categorized=/true);
	return 1;
	}

	ProfileData Profile;

	std::vector<ClangTidyError> Errors;
	ClangTidyStats Stats =
	runClangTidy(std::move(OptionsProvider), OptionsParser.getCompilations(),
	PathList, &Errors,
	EnableCheckProfile ? &Profile : nullptr);
	bool FoundErrors =
	std::find_if(Errors.begin(), Errors.end(), [](const ClangTidyError &E) {
	return E.DiagLevel == ClangTidyError::Error;
	}) != Errors.end();

	const bool DisableFixes = Fix && FoundErrors && !FixErrors;

	// -fix-errors implies -fix.
	handleErrors(Errors, (FixErrors \|\| Fix) && !DisableFixes);

	if (!ExportFixes.empty() && !Errors.empty()) {
	std::error_code EC;
	llvm::raw_fd_ostream OS(ExportFixes, EC, llvm::sys::fs::F_None);
	if (EC) {
	llvm::errs() << "Error opening output file: " << EC.message() << '\n';
	return 1;
	}
	exportReplacements(Errors, OS);
	}

	printStats(Stats);
	if (DisableFixes)
	llvm::errs()
	<< "Found compiler errors, but -fix-errors was not specified.\n"
	"Fixes have NOT been applied.\n\n";

	if (EnableCheckProfile)
	printProfileData(Profile, llvm::errs());

	return 0;
	}

	// This anchor is used to force the linker to link the CERTModule.
	extern volatile int CERTModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED CERTModuleAnchorDestination =
	CERTModuleAnchorSource;

	// This anchor is used to force the linker to link the LLVMModule.
	extern volatile int LLVMModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED LLVMModuleAnchorDestination =
	LLVMModuleAnchorSource;

	// This anchor is used to force the linker to link the CppCoreGuidelinesModule.
	extern volatile int CppCoreGuidelinesModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED CppCoreGuidelinesModuleAnchorDestination =
	CppCoreGuidelinesModuleAnchorSource;

	// This anchor is used to force the linker to link the GoogleModule.
	extern volatile int GoogleModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED GoogleModuleAnchorDestination =
	GoogleModuleAnchorSource;

	// This anchor is used to force the linker to link the MiscModule.
	extern volatile int MiscModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED MiscModuleAnchorDestination =
	MiscModuleAnchorSource;

	// This anchor is used to force the linker to link the ModernizeModule.
	extern volatile int ModernizeModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED ModernizeModuleAnchorDestination =
	ModernizeModuleAnchorSource;

	// This anchor is used to force the linker to link the PerformanceModule.
	extern volatile int PerformanceModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED PerformanceModuleAnchorDestination =
	PerformanceModuleAnchorSource;

	// This anchor is used to force the linker to link the ReadabilityModule.
	extern volatile int ReadabilityModuleAnchorSource;
	static int LLVM_ATTRIBUTE_UNUSED ReadabilityModuleAnchorDestination =
	ReadabilityModuleAnchorSource;

	} // namespace tidy
	} // namespace clang

	int main(int argc, const char **argv) {
	return clang::tidy::clangTidyMain(argc, argv);
	}