void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders,
                                   StringRef OutputPath, bool ShowDepth) {
  raw_ostream *OutputFile = &llvm::errs();
  bool OwnsOutputFile = false;

  // Open the output file, if used.
  if (!OutputPath.empty()) {
    std::string Error;
    llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
        OutputPath.str().c_str(), Error, llvm::sys::fs::F_Append);
    if (!Error.empty()) {
      PP.getDiagnostics().Report(
        clang::diag::warn_fe_cc_print_header_failure) << Error;
      delete OS;
    } else {
      OS->SetUnbuffered();
      OS->SetUseAtomicWrites(true);
      OutputFile = OS;
      OwnsOutputFile = true;
    }
  }

  PP.addPPCallbacks(new HeaderIncludesCallback(&PP, ShowAllHeaders,
                                               OutputFile, OwnsOutputFile,
                                               ShowDepth));
}
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void clang::AttachHeaderIncludeGen(Preprocessor &PP,
                                   const DependencyOutputOptions &DepOpts,
                                   bool ShowAllHeaders, StringRef OutputPath,
                                   bool ShowDepth, bool MSStyle) {
  raw_ostream *OutputFile = MSStyle ? &llvm::outs() : &llvm::errs();
  bool OwnsOutputFile = false;

  // Open the output file, if used.
  if (!OutputPath.empty()) {
    std::error_code EC;
    llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
        OutputPath.str(), EC, llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
    if (EC) {
      PP.getDiagnostics().Report(clang::diag::warn_fe_cc_print_header_failure)
          << EC.message();
      delete OS;
    } else {
      OS->SetUnbuffered();
      OutputFile = OS;
      OwnsOutputFile = true;
    }
  }

  // Print header info for extra headers, pretending they were discovered by
  // the regular preprocessor. The primary use case is to support proper
  // generation of Make / Ninja file dependencies for implicit includes, such
  // as sanitizer blacklists. It's only important for cl.exe compatibility,
  // the GNU way to generate rules is -M / -MM / -MD / -MMD.
  for (const auto &Header : DepOpts.ExtraDeps)
    PrintHeaderInfo(OutputFile, Header, ShowDepth, 2, MSStyle);
  PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(
      &PP, ShowAllHeaders, OutputFile, DepOpts, OwnsOutputFile, ShowDepth,
      MSStyle));
}
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/// InclusionRewriterInInput - Implement -frewrite-includes mode.
void clang::RewriteIncludesInInput(Preprocessor &PP, raw_ostream *OS,
                                   const PreprocessorOutputOptions &Opts) {
  SourceManager &SM = PP.getSourceManager();
  InclusionRewriter *Rewrite = new InclusionRewriter(PP, *OS,
                                                     Opts.ShowLineMarkers);
  PP.addPPCallbacks(Rewrite);
  PP.IgnorePragmas();

  // First let the preprocessor process the entire file and call callbacks.
  // Callbacks will record which #include's were actually performed.
  PP.EnterMainSourceFile();
  Token Tok;
  // Only preprocessor directives matter here, so disable macro expansion
  // everywhere else as an optimization.
  // TODO: It would be even faster if the preprocessor could be switched
  // to a mode where it would parse only preprocessor directives and comments,
  // nothing else matters for parsing or processing.
  PP.SetMacroExpansionOnlyInDirectives();
  do {
    PP.Lex(Tok);
  } while (Tok.isNot(tok::eof));
  Rewrite->setPredefinesBuffer(SM.getBuffer(PP.getPredefinesFileID()));
  Rewrite->Process(PP.getPredefinesFileID(), SrcMgr::C_User);
  Rewrite->Process(SM.getMainFileID(), SrcMgr::C_User);
  OS->flush();
}
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void clang::AttachHeaderIncludeGen(Preprocessor &PP, bool ShowAllHeaders,
                                   StringRef OutputPath, bool ShowDepth,
                                   bool MSStyle) {
  raw_ostream *OutputFile = MSStyle ? &llvm::outs() : &llvm::errs();
  bool OwnsOutputFile = false;

  // Open the output file, if used.
  if (!OutputPath.empty()) {
    std::error_code EC;
    llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
        OutputPath.str(), EC, llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
    if (EC) {
      PP.getDiagnostics().Report(clang::diag::warn_fe_cc_print_header_failure)
          << EC.message();
      delete OS;
    } else {
      OS->SetUnbuffered();
      OS->SetUseAtomicWrites(true);
      OutputFile = OS;
      OwnsOutputFile = true;
    }
  }

  PP.addPPCallbacks(llvm::make_unique<HeaderIncludesCallback>(&PP,
                                                              ShowAllHeaders,
                                                              OutputFile,
                                                              OwnsOutputFile,
                                                              ShowDepth,
                                                              MSStyle));
}
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void clang::AttachDependencyFileGen(Preprocessor &PP,
                                    const DependencyOutputOptions &Opts) {
  if (Opts.Targets.empty()) {
    PP.getDiagnostics().Report(diag::err_fe_dependency_file_requires_MT);
    return;
  }

  // Disable the "file not found" diagnostic if the -MG option was given.
  if (Opts.AddMissingHeaderDeps)
    PP.SetSuppressIncludeNotFoundError(true);

  PP.addPPCallbacks(new DependencyFileCallback(&PP, Opts));
}
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void clang::AttachDependencyFileGen(Preprocessor &PP,
                                    const DependencyOutputOptions &Opts) {
    if (Opts.Targets.empty()) {
        PP.getDiagnostics().Report(diag::err_fe_dependency_file_requires_MT);
        return;
    }

    std::string Err;
    llvm::raw_ostream *OS(new llvm::raw_fd_ostream(Opts.OutputFile.c_str(), Err));
    if (!Err.empty()) {
        PP.getDiagnostics().Report(diag::err_fe_error_opening)
                << Opts.OutputFile << Err;
        return;
    }

    PP.addPPCallbacks(new DependencyFileCallback(&PP, OS, Opts));
}
void clang::AttachDependencyFileGen(Preprocessor &PP,
                                    const DependencyOutputOptions &Opts) {
  if (Opts.Targets.empty()) {
    PP.getDiagnostics().Report(diag::err_fe_dependency_file_requires_MT);
    return;
  }

  std::string Err;
  raw_ostream *OS(new llvm::raw_fd_ostream(Opts.OutputFile.c_str(), Err));
  if (!Err.empty()) {
    PP.getDiagnostics().Report(diag::err_fe_error_opening)
      << Opts.OutputFile << Err;
    return;
  }

  // Disable the "file not found" diagnostic if the -MG option was given.
  if (Opts.AddMissingHeaderDeps)
    PP.SetSuppressIncludeNotFoundError(true);

  PP.addPPCallbacks(new DependencyFileCallback(&PP, OS, Opts));
}
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void DependencyCollector::attachToPreprocessor(Preprocessor &PP) {
  PP.addPPCallbacks(
      llvm::make_unique<DepCollectorPPCallbacks>(*this, PP.getSourceManager()));
}
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void DependencyCollector::attachToPreprocessor(Preprocessor &PP) {
  PP.addPPCallbacks(new DepCollectorPPCallbacks(*this, PP.getSourceManager()));
}
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void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
                                     StringRef SysRoot) {
  PP.addPPCallbacks(new DependencyGraphCallback(&PP, OutputFile, SysRoot));
}
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void DependencyCollector::attachToPreprocessor(Preprocessor &PP) {
  PP.addPPCallbacks(
      llvm::make_unique<DepCollectorPPCallbacks>(*this, PP.getSourceManager()));
  PP.getHeaderSearchInfo().getModuleMap().addModuleMapCallbacks(
      llvm::make_unique<DepCollectorMMCallbacks>(*this));
}
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 ModuleMapCheckerConsumer(ModuleMapChecker &Checker, Preprocessor &PP) {
   // PP takes ownership.
   PP.addPPCallbacks(llvm::make_unique<ModuleMapCheckerCallbacks>(Checker));
 }