text: //===- CompilerInvocation.cpp ---------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  #include "clang/Frontend/CompilerInvocation.h"
  #include "TestModuleFileExtension.h"
  #include "clang/Basic/Builtins.h"
  #include "clang/Basic/CharInfo.h"
  #include "clang/Basic/CodeGenOptions.h"
  #include "clang/Basic/CommentOptions.h"
  #include "clang/Basic/DebugInfoOptions.h"
  #include "clang/Basic/Diagnostic.h"
  #include "clang/Basic/DiagnosticOptions.h"
  #include "clang/Basic/FileSystemOptions.h"
  #include "clang/Basic/LLVM.h"
  #include "clang/Basic/LangOptions.h"
  #include "clang/Basic/ObjCRuntime.h"
  #include "clang/Basic/Sanitizers.h"
  #include "clang/Basic/SourceLocation.h"
  #include "clang/Basic/TargetOptions.h"
  #include "clang/Basic/Version.h"
  #include "clang/Basic/Visibility.h"
  #include "clang/Basic/XRayInstr.h"
  #include "clang/Config/config.h"
  #include "clang/Driver/Driver.h"
  #include "clang/Driver/DriverDiagnostic.h"
  #include "clang/Driver/Options.h"
  #include "clang/Frontend/CommandLineSourceLoc.h"
  #include "clang/Frontend/DependencyOutputOptions.h"
  #include "clang/Frontend/FrontendDiagnostic.h"
  #include "clang/Frontend/FrontendOptions.h"
  #include "clang/Frontend/FrontendPluginRegistry.h"
  #include "clang/Frontend/LangStandard.h"
  #include "clang/Frontend/MigratorOptions.h"
  #include "clang/Frontend/PreprocessorOutputOptions.h"
  #include "clang/Frontend/Utils.h"
  #include "clang/Lex/HeaderSearchOptions.h"
  #include "clang/Lex/PreprocessorOptions.h"
  #include "clang/Sema/CodeCompleteOptions.h"
  #include "clang/Serialization/ModuleFileExtension.h"
  #include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
  #include "llvm/ADT/APInt.h"
  #include "llvm/ADT/ArrayRef.h"
  #include "llvm/ADT/CachedHashString.h"
  #include "llvm/ADT/Hashing.h"
  #include "llvm/ADT/None.h"
  #include "llvm/ADT/Optional.h"
  #include "llvm/ADT/SmallString.h"
  #include "llvm/ADT/SmallVector.h"
  #include "llvm/ADT/StringRef.h"
  #include "llvm/ADT/StringSwitch.h"
  #include "llvm/ADT/Triple.h"
  #include "llvm/ADT/Twine.h"
  #include "llvm/IR/DebugInfoMetadata.h"
  #include "llvm/Linker/Linker.h"
  #include "llvm/MC/MCTargetOptions.h"
  #include "llvm/Option/Arg.h"
  #include "llvm/Option/ArgList.h"
  #include "llvm/Option/OptSpecifier.h"
  #include "llvm/Option/OptTable.h"
  #include "llvm/Option/Option.h"
  #include "llvm/ProfileData/InstrProfReader.h"
  #include "llvm/Support/CodeGen.h"
  #include "llvm/Support/Compiler.h"
  #include "llvm/Support/Error.h"
  #include "llvm/Support/ErrorHandling.h"
  #include "llvm/Support/ErrorOr.h"
  #include "llvm/Support/FileSystem.h"
  #include "llvm/Support/Host.h"
  #include "llvm/Support/MathExtras.h"
  #include "llvm/Support/MemoryBuffer.h"
  #include "llvm/Support/Path.h"
  #include "llvm/Support/Process.h"
  #include "llvm/Support/Regex.h"
  #include "llvm/Support/VersionTuple.h"
  #include "llvm/Support/VirtualFileSystem.h"
  #include "llvm/Support/raw_ostream.h"
  #include "llvm/Target/TargetOptions.h"
  #include <algorithm>
  #include <atomic>
  #include <cassert>
  #include <cstddef>
  #include <cstring>
  #include <memory>
  #include <string>
  #include <tuple>
  #include <utility>
  #include <vector>
  
  using namespace clang;
  using namespace driver;
  using namespace options;
  using namespace llvm::opt;
  
  //===----------------------------------------------------------------------===//
  // Initialization.
  //===----------------------------------------------------------------------===//
  
  CompilerInvocationBase::CompilerInvocationBase()
      : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
        DiagnosticOpts(new DiagnosticOptions()),
        HeaderSearchOpts(new HeaderSearchOptions()),
        PreprocessorOpts(new PreprocessorOptions()) {}
  
  CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
      : LangOpts(new LangOptions(*X.getLangOpts())),
        TargetOpts(new TargetOptions(X.getTargetOpts())),
        DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
        HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
        PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
  
  CompilerInvocationBase::~CompilerInvocationBase() = default;
  
  //===----------------------------------------------------------------------===//
  // Deserialization (from args)
  //===----------------------------------------------------------------------===//
  
  static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
                                       DiagnosticsEngine &Diags) {
    unsigned DefaultOpt = llvm::CodeGenOpt::None;
    if (IK.getLanguage() == InputKind::OpenCL && !Args.hasArg(OPT_cl_opt_disable))
      DefaultOpt = llvm::CodeGenOpt::Default;
  
    if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
      if (A->getOption().matches(options::OPT_O0))
        return llvm::CodeGenOpt::None;
  
      if (A->getOption().matches(options::OPT_Ofast))
        return llvm::CodeGenOpt::Aggressive;
  
      assert(A->getOption().matches(options::OPT_O));
  
      StringRef S(A->getValue());
      if (S == "s" || S == "z" || S.empty())
        return llvm::CodeGenOpt::Default;
  
      if (S == "g")
        return llvm::CodeGenOpt::Less;
  
      return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
    }
  
    return DefaultOpt;
  }
  
  static unsigned getOptimizationLevelSize(ArgList &Args) {
    if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
      if (A->getOption().matches(options::OPT_O)) {
        switch (A->getValue()[0]) {
        default:
          return 0;
        case 's':
          return 1;
        case 'z':
          return 2;
        }
      }
    }
    return 0;
  }
  
  static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
                                OptSpecifier GroupWithValue,
                                std::vector<std::string> &Diagnostics) {
    for (auto *A : Args.filtered(Group)) {
      if (A->getOption().getKind() == Option::FlagClass) {
        // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
        // its name (minus the "W" or "R" at the beginning) to the warning list.
        Diagnostics.push_back(A->getOption().getName().drop_front(1));
      } else if (A->getOption().matches(GroupWithValue)) {
        // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
        Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
      } else {
        // Otherwise, add its value (for OPT_W_Joined and similar).
        for (const auto *Arg : A->getValues())
          Diagnostics.emplace_back(Arg);
      }
    }
  }
  
  // Parse the Static Analyzer configuration. If \p Diags is set to nullptr,
  // it won't verify the input.
  static void parseAnalyzerConfigs(AnalyzerOptions &AnOpts,
                                   DiagnosticsEngine *Diags);
  
  static void getAllNoBuiltinFuncValues(ArgList &Args,
                                        std::vector<std::string> &Funcs) {
    SmallVector<const char *, 8> Values;
    for (const auto &Arg : Args) {
      const Option &O = Arg->getOption();
      if (O.matches(options::OPT_fno_builtin_)) {
        const char *FuncName = Arg->getValue();
        if (Builtin::Context::isBuiltinFunc(FuncName))
          Values.push_back(FuncName);
      }
    }
    Funcs.insert(Funcs.end(), Values.begin(), Values.end());
  }
  
  static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
                                DiagnosticsEngine &Diags) {
    bool Success = true;
    if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
      StringRef Name = A->getValue();
      AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
  #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
        .Case(CMDFLAG, NAME##Model)
  #include "clang/StaticAnalyzer/Core/Analyses.def"
        .Default(NumStores);
      if (Value == NumStores) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.AnalysisStoreOpt = Value;
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
      StringRef Name = A->getValue();
      AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
  #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
        .Case(CMDFLAG, NAME##Model)
  #include "clang/StaticAnalyzer/Core/Analyses.def"
        .Default(NumConstraints);
      if (Value == NumConstraints) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.AnalysisConstraintsOpt = Value;
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
      StringRef Name = A->getValue();
      AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
  #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
        .Case(CMDFLAG, PD_##NAME)
  #include "clang/StaticAnalyzer/Core/Analyses.def"
        .Default(NUM_ANALYSIS_DIAG_CLIENTS);
      if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.AnalysisDiagOpt = Value;
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
      StringRef Name = A->getValue();
      AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
  #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
        .Case(CMDFLAG, NAME)
  #include "clang/StaticAnalyzer/Core/Analyses.def"
        .Default(NumPurgeModes);
      if (Value == NumPurgeModes) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.AnalysisPurgeOpt = Value;
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
      StringRef Name = A->getValue();
      AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
  #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
        .Case(CMDFLAG, NAME)
  #include "clang/StaticAnalyzer/Core/Analyses.def"
        .Default(NumInliningModes);
      if (Value == NumInliningModes) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.InliningMode = Value;
      }
    }
  
    Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
    Opts.ShowCheckerHelpAlpha = Args.hasArg(OPT_analyzer_checker_help_alpha);
    Opts.ShowCheckerHelpDeveloper =
        Args.hasArg(OPT_analyzer_checker_help_developer);
  
    Opts.ShowCheckerOptionList = Args.hasArg(OPT_analyzer_checker_option_help);
    Opts.ShowCheckerOptionAlphaList =
        Args.hasArg(OPT_analyzer_checker_option_help_alpha);
    Opts.ShowCheckerOptionDeveloperList =
        Args.hasArg(OPT_analyzer_checker_option_help_developer);
  
    Opts.ShowConfigOptionsList = Args.hasArg(OPT_analyzer_config_help);
    Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
    Opts.ShouldEmitErrorsOnInvalidConfigValue =
        /* negated */!llvm::StringSwitch<bool>(
                     Args.getLastArgValue(OPT_analyzer_config_compatibility_mode))
          .Case("true", true)
          .Case("false", false)
          .Default(false);
    Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
  
    Opts.visualizeExplodedGraphWithGraphViz =
      Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
    Opts.DumpExplodedGraphTo = Args.getLastArgValue(OPT_analyzer_dump_egraph);
    Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
    Opts.AnalyzerWerror = Args.hasArg(OPT_analyzer_werror);
    Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
    Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
    Opts.AnalyzeNestedBlocks =
      Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
    Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
    Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
    Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
    Opts.maxBlockVisitOnPath =
        getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
    Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
    Opts.InlineMaxStackDepth =
        getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
                           Opts.InlineMaxStackDepth, Diags);
  
    Opts.CheckersControlList.clear();
    for (const Arg *A :
         Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
      A->claim();
      bool enable = (A->getOption().getID() == OPT_analyzer_checker);
      // We can have a list of comma separated checker names, e.g:
      // '-analyzer-checker=cocoa,unix'
      StringRef checkerList = A->getValue();
      SmallVector<StringRef, 4> checkers;
      checkerList.split(checkers, ",");
      for (auto checker : checkers)
        Opts.CheckersControlList.emplace_back(checker, enable);
    }
  
    // Go through the analyzer configuration options.
    for (const auto *A : Args.filtered(OPT_analyzer_config)) {
  
      // We can have a list of comma separated config names, e.g:
      // '-analyzer-config key1=val1,key2=val2'
      StringRef configList = A->getValue();
      SmallVector<StringRef, 4> configVals;
      configList.split(configVals, ",");
      for (const auto &configVal : configVals) {
        StringRef key, val;
        std::tie(key, val) = configVal.split("=");
        if (val.empty()) {
          Diags.Report(SourceLocation(),
                       diag::err_analyzer_config_no_value) << configVal;
          Success = false;
          break;
        }
        if (val.find('=') != StringRef::npos) {
          Diags.Report(SourceLocation(),
                       diag::err_analyzer_config_multiple_values)
            << configVal;
          Success = false;
          break;
        }
  
        // TODO: Check checker options too, possibly in CheckerRegistry.
        // Leave unknown non-checker configs unclaimed.
        if (!key.contains(":") && Opts.isUnknownAnalyzerConfig(key)) {
          if (Opts.ShouldEmitErrorsOnInvalidConfigValue)
            Diags.Report(diag::err_analyzer_config_unknown) << key;
          continue;
        }
  
        A->claim();
        Opts.Config[key] = val;
      }
    }
  
    if (Opts.ShouldEmitErrorsOnInvalidConfigValue)
      parseAnalyzerConfigs(Opts, &Diags);
    else
      parseAnalyzerConfigs(Opts, nullptr);
  
    llvm::raw_string_ostream os(Opts.FullCompilerInvocation);
    for (unsigned i = 0; i < Args.getNumInputArgStrings(); ++i) {
      if (i != 0)
        os << " ";
      os << Args.getArgString(i);
    }
    os.flush();
  
    return Success;
  }
  
  static StringRef getStringOption(AnalyzerOptions::ConfigTable &Config,
                                   StringRef OptionName, StringRef DefaultVal) {
    return Config.insert({OptionName, DefaultVal}).first->second;
  }
  
  static void initOption(AnalyzerOptions::ConfigTable &Config,
                         DiagnosticsEngine *Diags,
                         StringRef &OptionField, StringRef Name,
                         StringRef DefaultVal) {
    // String options may be known to invalid (e.g. if the expected string is a
    // file name, but the file does not exist), those will have to be checked in
    // parseConfigs.
    OptionField = getStringOption(Config, Name, DefaultVal);
  }
  
  static void initOption(AnalyzerOptions::ConfigTable &Config,
                         DiagnosticsEngine *Diags,
                         bool &OptionField, StringRef Name, bool DefaultVal) {
    auto PossiblyInvalidVal = llvm::StringSwitch<Optional<bool>>(
                   getStringOption(Config, Name, (DefaultVal ? "true" : "false")))
        .Case("true", true)
        .Case("false", false)
        .Default(None);
  
    if (!PossiblyInvalidVal) {
      if (Diags)
        Diags->Report(diag::err_analyzer_config_invalid_input)
          << Name << "a boolean";
      else
        OptionField = DefaultVal;
    } else
      OptionField = PossiblyInvalidVal.getValue();
  }
  
  static void initOption(AnalyzerOptions::ConfigTable &Config,
                         DiagnosticsEngine *Diags,
                         unsigned &OptionField, StringRef Name,
                         unsigned DefaultVal) {
  
    OptionField = DefaultVal;
    bool HasFailed = getStringOption(Config, Name, std::to_string(DefaultVal))
                       .getAsInteger(0, OptionField);
    if (Diags && HasFailed)
      Diags->Report(diag::err_analyzer_config_invalid_input)
        << Name << "an unsigned";
  }
  
  static void parseAnalyzerConfigs(AnalyzerOptions &AnOpts,
                                   DiagnosticsEngine *Diags) {
    // TODO: There's no need to store the entire configtable, it'd be plenty
    // enough tostore checker options.
  
  #define ANALYZER_OPTION(TYPE, NAME, CMDFLAG, DESC, DEFAULT_VAL)                \
    initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, DEFAULT_VAL);
  
  #define ANALYZER_OPTION_DEPENDS_ON_USER_MODE(TYPE, NAME, CMDFLAG, DESC,        \
                                             SHALLOW_VAL, DEEP_VAL)              \
    switch (AnOpts.getUserMode()) {                                              \
    case UMK_Shallow:                                                            \
      initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, SHALLOW_VAL);       \
      break;                                                                     \
    case UMK_Deep:                                                               \
      initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, DEEP_VAL);          \
      break;                                                                     \
    }                                                                            \
  
  #include "clang/StaticAnalyzer/Core/AnalyzerOptions.def"
  #undef ANALYZER_OPTION
  #undef ANALYZER_OPTION_DEPENDS_ON_USER_MODE
  
    // At this point, AnalyzerOptions is configured. Let's validate some options.
  
    if (!Diags)
      return;
  
    if (AnOpts.ShouldTrackConditionsDebug && !AnOpts.ShouldTrackConditions)
      Diags->Report(diag::err_analyzer_config_invalid_input)
          << "track-conditions-debug" << "'track-conditions' to also be enabled";
  
    if (!AnOpts.CTUDir.empty() && !llvm::sys::fs::is_directory(AnOpts.CTUDir))
      Diags->Report(diag::err_analyzer_config_invalid_input) << "ctu-dir"
                                                             << "a filename";
  
    if (!AnOpts.ModelPath.empty() &&
        !llvm::sys::fs::is_directory(AnOpts.ModelPath))
      Diags->Report(diag::err_analyzer_config_invalid_input) << "model-path"
                                                             << "a filename";
  }
  
  static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
    Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
    Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
    return true;
  }
  
  static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
    Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
    Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
  }
  
  static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
    if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
      StringRef Value = A->getValue();
      if (Value == "small" || Value == "kernel" || Value == "medium" ||
          Value == "large" || Value == "tiny")
        return Value;
      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
    }
    return "default";
  }
  
  static llvm::Reloc::Model getRelocModel(ArgList &Args,
                                          DiagnosticsEngine &Diags) {
    if (Arg *A = Args.getLastArg(OPT_mrelocation_model)) {
      StringRef Value = A->getValue();
      auto RM = llvm::StringSwitch<llvm::Optional<llvm::Reloc::Model>>(Value)
                    .Case("static", llvm::Reloc::Static)
                    .Case("pic", llvm::Reloc::PIC_)
                    .Case("ropi", llvm::Reloc::ROPI)
                    .Case("rwpi", llvm::Reloc::RWPI)
                    .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
                    .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
                    .Default(None);
      if (RM.hasValue())
        return *RM;
      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
    }
    return llvm::Reloc::PIC_;
  }
  
  /// Create a new Regex instance out of the string value in \p RpassArg.
  /// It returns a pointer to the newly generated Regex instance.
  static std::shared_ptr<llvm::Regex>
  GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
                                  Arg *RpassArg) {
    StringRef Val = RpassArg->getValue();
    std::string RegexError;
    std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
    if (!Pattern->isValid(RegexError)) {
      Diags.Report(diag::err_drv_optimization_remark_pattern)
          << RegexError << RpassArg->getAsString(Args);
      Pattern.reset();
    }
    return Pattern;
  }
  
  static bool parseDiagnosticLevelMask(StringRef FlagName,
                                       const std::vector<std::string> &Levels,
                                       DiagnosticsEngine *Diags,
                                       DiagnosticLevelMask &M) {
    bool Success = true;
    for (const auto &Level : Levels) {
      DiagnosticLevelMask const PM =
        llvm::StringSwitch<DiagnosticLevelMask>(Level)
          .Case("note",    DiagnosticLevelMask::Note)
          .Case("remark",  DiagnosticLevelMask::Remark)
          .Case("warning", DiagnosticLevelMask::Warning)
          .Case("error",   DiagnosticLevelMask::Error)
          .Default(DiagnosticLevelMask::None);
      if (PM == DiagnosticLevelMask::None) {
        Success = false;
        if (Diags)
          Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
      }
      M = M | PM;
    }
    return Success;
  }
  
  static void parseSanitizerKinds(StringRef FlagName,
                                  const std::vector<std::string> &Sanitizers,
                                  DiagnosticsEngine &Diags, SanitizerSet &S) {
    for (const auto &Sanitizer : Sanitizers) {
      SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
      if (K == SanitizerMask())
        Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
      else
        S.set(K, true);
    }
  }
  
  static void parseXRayInstrumentationBundle(StringRef FlagName, StringRef Bundle,
                                             ArgList &Args, DiagnosticsEngine &D,
                                             XRayInstrSet &S) {
    llvm::SmallVector<StringRef, 2> BundleParts;
    llvm::SplitString(Bundle, BundleParts, ",");
    for (const auto B : BundleParts) {
      auto Mask = parseXRayInstrValue(B);
      if (Mask == XRayInstrKind::None)
        if (B != "none")
          D.Report(diag::err_drv_invalid_value) << FlagName << Bundle;
        else
          S.Mask = Mask;
      else if (Mask == XRayInstrKind::All)
        S.Mask = Mask;
      else
        S.set(Mask, true);
    }
  }
  
  // Set the profile kind for fprofile-instrument.
  static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
                                 DiagnosticsEngine &Diags) {
    Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
    if (A == nullptr)
      return;
    StringRef S = A->getValue();
    unsigned I = llvm::StringSwitch<unsigned>(S)
                     .Case("none", CodeGenOptions::ProfileNone)
                     .Case("clang", CodeGenOptions::ProfileClangInstr)
                     .Case("llvm", CodeGenOptions::ProfileIRInstr)
                     .Case("csllvm", CodeGenOptions::ProfileCSIRInstr)
                     .Default(~0U);
    if (I == ~0U) {
      Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
                                                           << S;
      return;
    }
    auto Instrumentor = static_cast<CodeGenOptions::ProfileInstrKind>(I);
    Opts.setProfileInstr(Instrumentor);
  }
  
  // Set the profile kind using fprofile-instrument-use-path.
  static void setPGOUseInstrumentor(CodeGenOptions &Opts,
                                    const Twine &ProfileName) {
    auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
    // In error, return silently and let Clang PGOUse report the error message.
    if (auto E = ReaderOrErr.takeError()) {
      llvm::consumeError(std::move(E));
      Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
      return;
    }
    std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
      std::move(ReaderOrErr.get());
    if (PGOReader->isIRLevelProfile()) {
      if (PGOReader->hasCSIRLevelProfile())
        Opts.setProfileUse(CodeGenOptions::ProfileCSIRInstr);
      else
        Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
    } else
      Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
  }
  
  static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
                               DiagnosticsEngine &Diags,
                               const TargetOptions &TargetOpts,
                               const FrontendOptions &FrontendOpts) {
    bool Success = true;
    llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
  
    unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
    // TODO: This could be done in Driver
    unsigned MaxOptLevel = 3;
    if (OptimizationLevel > MaxOptLevel) {
      // If the optimization level is not supported, fall back on the default
      // optimization
      Diags.Report(diag::warn_drv_optimization_value)
          << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
      OptimizationLevel = MaxOptLevel;
    }
    Opts.OptimizationLevel = OptimizationLevel;
  
    // At O0 we want to fully disable inlining outside of cases marked with
    // 'alwaysinline' that are required for correctness.
    Opts.setInlining((Opts.OptimizationLevel == 0)
                         ? CodeGenOptions::OnlyAlwaysInlining
                         : CodeGenOptions::NormalInlining);
    // Explicit inlining flags can disable some or all inlining even at
    // optimization levels above zero.
    if (Arg *InlineArg = Args.getLastArg(
            options::OPT_finline_functions, options::OPT_finline_hint_functions,
            options::OPT_fno_inline_functions, options::OPT_fno_inline)) {
      if (Opts.OptimizationLevel > 0) {
        const Option &InlineOpt = InlineArg->getOption();
        if (InlineOpt.matches(options::OPT_finline_functions))
          Opts.setInlining(CodeGenOptions::NormalInlining);
        else if (InlineOpt.matches(options::OPT_finline_hint_functions))
          Opts.setInlining(CodeGenOptions::OnlyHintInlining);
        else
          Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
      }
    }
  
    Opts.ExperimentalNewPassManager = Args.hasFlag(
        OPT_fexperimental_new_pass_manager, OPT_fno_experimental_new_pass_manager,
        /* Default */ ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER);
  
    Opts.DebugPassManager =
        Args.hasFlag(OPT_fdebug_pass_manager, OPT_fno_debug_pass_manager,
                     /* Default */ false);
  
    if (Arg *A = Args.getLastArg(OPT_fveclib)) {
      StringRef Name = A->getValue();
      if (Name == "Accelerate")
        Opts.setVecLib(CodeGenOptions::Accelerate);
      else if (Name == "MASSV")
        Opts.setVecLib(CodeGenOptions::MASSV);
      else if (Name == "SVML")
        Opts.setVecLib(CodeGenOptions::SVML);
      else if (Name == "none")
        Opts.setVecLib(CodeGenOptions::NoLibrary);
      else
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
    }
  
    if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
      unsigned Val =
          llvm::StringSwitch<unsigned>(A->getValue())
              .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
              .Case("line-directives-only", codegenoptions::DebugDirectivesOnly)
              .Case("limited", codegenoptions::LimitedDebugInfo)
              .Case("standalone", codegenoptions::FullDebugInfo)
              .Default(~0U);
      if (Val == ~0U)
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
                                                  << A->getValue();
      else
        Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
    }
    if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
      unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
                         .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
                         .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
                         .Case("sce", unsigned(llvm::DebuggerKind::SCE))
                         .Default(~0U);
      if (Val == ~0U)
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
                                                  << A->getValue();
      else
        Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
    }
    Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
    Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
    Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
    Opts.CodeViewGHash = Args.hasArg(OPT_gcodeview_ghash);
    Opts.MacroDebugInfo = Args.hasArg(OPT_debug_info_macro);
    Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
    Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
    Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
    Opts.SplitDwarfOutput = Args.getLastArgValue(OPT_split_dwarf_output);
    Opts.SplitDwarfInlining = !Args.hasArg(OPT_fno_split_dwarf_inlining);
    Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
    Opts.DebugExplicitImport = Args.hasArg(OPT_dwarf_explicit_import);
    Opts.DebugFwdTemplateParams = Args.hasArg(OPT_debug_forward_template_params);
    Opts.EmbedSource = Args.hasArg(OPT_gembed_source);
  
    for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
      Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
  
    if (const Arg *A =
            Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
      Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
  
    Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
    Opts.DisableLifetimeMarkers = Args.hasArg(OPT_disable_lifetimemarkers);
  
    llvm::Triple T(TargetOpts.Triple);
    llvm::Triple::ArchType Arch = T.getArch();
    if (Opts.OptimizationLevel > 0 &&
        (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64))
      Opts.EnableDebugEntryValues = Args.hasArg(OPT_femit_debug_entry_values);
  
    Opts.DisableO0ImplyOptNone = Args.hasArg(OPT_disable_O0_optnone);
    Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
    Opts.IndirectTlsSegRefs = Args.hasArg(OPT_mno_tls_direct_seg_refs);
    Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
    Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
      OPT_fuse_register_sized_bitfield_access);
    Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
    Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
    Opts.NewStructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa) &&
                             Args.hasArg(OPT_new_struct_path_tbaa);
    Opts.FineGrainedBitfieldAccesses =
        Args.hasFlag(OPT_ffine_grained_bitfield_accesses,
                     OPT_fno_fine_grained_bitfield_accesses, false);
    Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
    Opts.RecordCommandLine = Args.getLastArgValue(OPT_record_command_line);
    Opts.MergeAllConstants = Args.hasArg(OPT_fmerge_all_constants);
    Opts.NoCommon = Args.hasArg(OPT_fno_common);
    Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
    Opts.OptimizeSize = getOptimizationLevelSize(Args);
    Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
                              Args.hasArg(OPT_ffreestanding));
    if (Opts.SimplifyLibCalls)
      getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
    Opts.UnrollLoops =
        Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
                     (Opts.OptimizationLevel > 1));
    Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
  
    Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
    Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
    Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
    Opts.DebugInfoForProfiling = Args.hasFlag(
        OPT_fdebug_info_for_profiling, OPT_fno_debug_info_for_profiling, false);
    Opts.DebugNameTable = static_cast<unsigned>(
        Args.hasArg(OPT_ggnu_pubnames)
            ? llvm::DICompileUnit::DebugNameTableKind::GNU
            : Args.hasArg(OPT_gpubnames)
                  ? llvm::DICompileUnit::DebugNameTableKind::Default
                  : llvm::DICompileUnit::DebugNameTableKind::None);
    Opts.DebugRangesBaseAddress = Args.hasArg(OPT_fdebug_ranges_base_address);
  
    setPGOInstrumentor(Opts, Args, Diags);
    Opts.InstrProfileOutput =
        Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
    Opts.ProfileInstrumentUsePath =
        Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
    if (!Opts.ProfileInstrumentUsePath.empty())
      setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
    Opts.ProfileRemappingFile =
        Args.getLastArgValue(OPT_fprofile_remapping_file_EQ);
    if (!Opts.ProfileRemappingFile.empty() && !Opts.ExperimentalNewPassManager) {
      Diags.Report(diag::err_drv_argument_only_allowed_with)
        << Args.getLastArg(OPT_fprofile_remapping_file_EQ)->getAsString(Args)
        << "-fexperimental-new-pass-manager";
    }
  
    Opts.CoverageMapping =
        Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
    Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
    Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
    Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
    Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
    Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
    Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
    Opts.RegisterGlobalDtorsWithAtExit =
        Args.hasArg(OPT_fregister_global_dtors_with_atexit);
    Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
    Opts.CodeModel = TargetOpts.CodeModel;
    Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
    Opts.DisableFPElim =
        (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
    Opts.DisableFree = Args.hasArg(OPT_disable_free);
    Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
    Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
    Opts.NoEscapingBlockTailCalls =
        Args.hasArg(OPT_fno_escaping_block_tail_calls);
    Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
    Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable) ||
                            Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                            Args.hasArg(OPT_cl_fast_relaxed_math);
    Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
    Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
                         Args.hasArg(OPT_cl_finite_math_only) ||
                         Args.hasArg(OPT_cl_fast_relaxed_math));
    Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
                         Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                         Args.hasArg(OPT_cl_finite_math_only) ||
                         Args.hasArg(OPT_cl_fast_relaxed_math));
    Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
                          Args.hasArg(OPT_cl_no_signed_zeros) ||
                          Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                          Args.hasArg(OPT_cl_fast_relaxed_math));
    Opts.Reassociate = Args.hasArg(OPT_mreassociate);
    Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero) ||
                       (Args.hasArg(OPT_fcuda_is_device) &&
                        Args.hasArg(OPT_fcuda_flush_denormals_to_zero));
    Opts.CorrectlyRoundedDivSqrt =
        Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
    Opts.UniformWGSize =
        Args.hasArg(OPT_cl_uniform_work_group_size);
    Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
    Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
    Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
    Opts.StrictFloatCastOverflow =
        !Args.hasArg(OPT_fno_strict_float_cast_overflow);
  
    Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
    Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
    Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
    Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
    Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
    Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
    Opts.IncrementalLinkerCompatible =
        Args.hasArg(OPT_mincremental_linker_compatible);
    Opts.PIECopyRelocations =
        Args.hasArg(OPT_mpie_copy_relocations);
    Opts.NoPLT = Args.hasArg(OPT_fno_plt);
    Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
    Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
    Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
    Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
    Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
    Opts.StrictReturn = !Args.hasArg(OPT_fno_strict_return);
    Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
    Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
    Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                        Args.hasArg(OPT_cl_fast_relaxed_math);
    Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
    Opts.RelocationModel = getRelocModel(Args, Diags);
    Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
    if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
      Diags.Report(diag::err_drv_invalid_value)
          << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
          << Opts.ThreadModel;
    Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
    Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
  
    Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
                                         OPT_fno_function_sections, false);
    Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
                                     OPT_fno_data_sections, false);
    Opts.StackSizeSection =
        Args.hasFlag(OPT_fstack_size_section, OPT_fno_stack_size_section, false);
    Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
                                           OPT_fno_unique_section_names, true);
  
    Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
  
    Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
  
    Opts.NullPointerIsValid = Args.hasArg(OPT_fno_delete_null_pointer_checks);
  
    Opts.ProfileSampleAccurate = Args.hasArg(OPT_fprofile_sample_accurate);
  
    Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
    Opts.PrepareForThinLTO = false;
    if (Arg *A = Args.getLastArg(OPT_flto_EQ)) {
      StringRef S = A->getValue();
      if (S == "thin")
        Opts.PrepareForThinLTO = true;
      else if (S != "full")
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
    }
    Opts.LTOUnit = Args.hasFlag(OPT_flto_unit, OPT_fno_lto_unit, false);
    Opts.EnableSplitLTOUnit = Args.hasArg(OPT_fsplit_lto_unit);
    if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
      if (IK.getLanguage() != InputKind::LLVM_IR)
        Diags.Report(diag::err_drv_argument_only_allowed_with)
            << A->getAsString(Args) << "-x ir";
      Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
    }
    if (Arg *A = Args.getLastArg(OPT_save_temps_EQ))
      Opts.SaveTempsFilePrefix =
          llvm::StringSwitch<std::string>(A->getValue())
              .Case("obj", FrontendOpts.OutputFile)
              .Default(llvm::sys::path::filename(FrontendOpts.OutputFile).str());
  
    Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
  
    Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
  
    Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
    Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
  
    Opts.PreferVectorWidth = Args.getLastArgValue(OPT_mprefer_vector_width_EQ);
  
    Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
    Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
  
    Opts.ControlFlowGuard = Args.hasArg(OPT_cfguard);
  
    Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
    Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
    Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
    if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
      Opts.CoverageDataFile = Args.getLastArgValue(OPT_coverage_data_file);
      Opts.CoverageNotesFile = Args.getLastArgValue(OPT_coverage_notes_file);
      Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
      Opts.CoverageNoFunctionNamesInData =
          Args.hasArg(OPT_coverage_no_function_names_in_data);
      Opts.ProfileFilterFiles =
          Args.getLastArgValue(OPT_fprofile_filter_files_EQ);
      Opts.ProfileExcludeFiles =
          Args.getLastArgValue(OPT_fprofile_exclude_files_EQ);
      Opts.CoverageExitBlockBeforeBody =
          Args.hasArg(OPT_coverage_exit_block_before_body);
      if (Args.hasArg(OPT_coverage_version_EQ)) {
        StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
        if (CoverageVersion.size() != 4) {
          Diags.Report(diag::err_drv_invalid_value)
              << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
              << CoverageVersion;
        } else {
          memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
        }
      }
    }
    // Handle -fembed-bitcode option.
    if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
      StringRef Name = A->getValue();
      unsigned Model = llvm::StringSwitch<unsigned>(Name)
          .Case("off", CodeGenOptions::Embed_Off)
          .Case("all", CodeGenOptions::Embed_All)
          .Case("bitcode", CodeGenOptions::Embed_Bitcode)
          .Case("marker", CodeGenOptions::Embed_Marker)
          .Default(~0U);
      if (Model == ~0U) {
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
        Success = false;
      } else
        Opts.setEmbedBitcode(
            static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
    }
    // FIXME: For backend options that are not yet recorded as function
    // attributes in the IR, keep track of them so we can embed them in a
    // separate data section and use them when building the bitcode.
    if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
      for (const auto &A : Args) {
        // Do not encode output and input.
        if (A->getOption().getID() == options::OPT_o ||
            A->getOption().getID() == options::OPT_INPUT ||
            A->getOption().getID() == options::OPT_x ||
            A->getOption().getID() == options::OPT_fembed_bitcode ||
            (A->getOption().getGroup().isValid() &&
             A->getOption().getGroup().getID() == options::OPT_W_Group))
          continue;
        ArgStringList ASL;
        A->render(Args, ASL);
        for (const auto &arg : ASL) {
          StringRef ArgStr(arg);
          Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
          // using \00 to separate each commandline options.
          Opts.CmdArgs.push_back('\0');
        }
      }
    }
  
    Opts.PreserveVec3Type = Args.hasArg(OPT_fpreserve_vec3_type);
    Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
    Opts.InstrumentFunctionsAfterInlining =
        Args.hasArg(OPT_finstrument_functions_after_inlining);
    Opts.InstrumentFunctionEntryBare =
        Args.hasArg(OPT_finstrument_function_entry_bare);
  
    Opts.XRayInstrumentFunctions =
        Args.hasArg(OPT_fxray_instrument);
    Opts.XRayAlwaysEmitCustomEvents =
        Args.hasArg(OPT_fxray_always_emit_customevents);
    Opts.XRayAlwaysEmitTypedEvents =
        Args.hasArg(OPT_fxray_always_emit_typedevents);
    Opts.XRayInstructionThreshold =
        getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
  
    auto XRayInstrBundles =
        Args.getAllArgValues(OPT_fxray_instrumentation_bundle);
    if (XRayInstrBundles.empty())
      Opts.XRayInstrumentationBundle.Mask = XRayInstrKind::All;
    else
      for (const auto &A : XRayInstrBundles)
        parseXRayInstrumentationBundle("-fxray-instrumentation-bundle=", A, Args,
                                       Diags, Opts.XRayInstrumentationBundle);
  
    Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
    Opts.CallFEntry = Args.hasArg(OPT_mfentry);
    Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
  
    if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
      StringRef Name = A->getValue();
      if (Name == "full") {
        Opts.CFProtectionReturn = 1;
        Opts.CFProtectionBranch = 1;
      } else if (Name == "return")
        Opts.CFProtectionReturn = 1;
      else if (Name == "branch")
        Opts.CFProtectionBranch = 1;
      else if (Name != "none") {
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
        Success = false;
      }
    }
  
    if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
                                       OPT_compress_debug_sections_EQ)) {
      if (A->getOption().getID() == OPT_compress_debug_sections) {
        // TODO: be more clever about the compression type auto-detection
        Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
      } else {
        auto DCT = llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
                       .Case("none", llvm::DebugCompressionType::None)
                       .Case("zlib", llvm::DebugCompressionType::Z)
                       .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
                       .Default(llvm::DebugCompressionType::None);
        Opts.setCompressDebugSections(DCT);
      }
    }
  
    Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
    Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
    for (auto *A :
         Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_builtin_bitcode)) {
      CodeGenOptions::BitcodeFileToLink F;
      F.Filename = A->getValue();
      if (A->getOption().matches(OPT_mlink_builtin_bitcode)) {
        F.LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded;
        // When linking CUDA bitcode, propagate function attributes so that
        // e.g. libdevice gets fast-math attrs if we're building with fast-math.
        F.PropagateAttrs = true;
        F.Internalize = true;
      }
      Opts.LinkBitcodeFiles.push_back(F);
    }
    Opts.SanitizeCoverageType =
        getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
    Opts.SanitizeCoverageIndirectCalls =
        Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
    Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
    Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
    Opts.SanitizeCoverageTraceDiv = Args.hasArg(OPT_fsanitize_coverage_trace_div);
    Opts.SanitizeCoverageTraceGep = Args.hasArg(OPT_fsanitize_coverage_trace_gep);
    Opts.SanitizeCoverage8bitCounters =
        Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
    Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
    Opts.SanitizeCoverageTracePCGuard =
        Args.hasArg(OPT_fsanitize_coverage_trace_pc_guard);
    Opts.SanitizeCoverageNoPrune = Args.hasArg(OPT_fsanitize_coverage_no_prune);
    Opts.SanitizeCoverageInline8bitCounters =
        Args.hasArg(OPT_fsanitize_coverage_inline_8bit_counters);
    Opts.SanitizeCoveragePCTable = Args.hasArg(OPT_fsanitize_coverage_pc_table);
    Opts.SanitizeCoverageStackDepth =
        Args.hasArg(OPT_fsanitize_coverage_stack_depth);
    Opts.SanitizeMemoryTrackOrigins =
        getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
    Opts.SanitizeMemoryUseAfterDtor =
        Args.hasFlag(OPT_fsanitize_memory_use_after_dtor,
                     OPT_fno_sanitize_memory_use_after_dtor,
                     false);
    Opts.SanitizeMinimalRuntime = Args.hasArg(OPT_fsanitize_minimal_runtime);
    Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
    Opts.SanitizeCfiICallGeneralizePointers =
        Args.hasArg(OPT_fsanitize_cfi_icall_generalize_pointers);
    Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
    if (Arg *A = Args.getLastArg(
            OPT_fsanitize_address_poison_custom_array_cookie,
            OPT_fno_sanitize_address_poison_custom_array_cookie)) {
      Opts.SanitizeAddressPoisonCustomArrayCookie =
          A->getOption().getID() ==
          OPT_fsanitize_address_poison_custom_array_cookie;
    }
    if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
                                 OPT_fno_sanitize_address_use_after_scope)) {
      Opts.SanitizeAddressUseAfterScope =
          A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
    }
    Opts.SanitizeAddressGlobalsDeadStripping =
        Args.hasArg(OPT_fsanitize_address_globals_dead_stripping);
    if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_odr_indicator,
                                 OPT_fno_sanitize_address_use_odr_indicator)) {
      Opts.SanitizeAddressUseOdrIndicator =
          A->getOption().getID() == OPT_fsanitize_address_use_odr_indicator;
    }
    Opts.SSPBufferSize =
        getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
    Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
    if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
      StringRef Val = A->getValue();
      unsigned StackAlignment = Opts.StackAlignment;
      Val.getAsInteger(10, StackAlignment);
      Opts.StackAlignment = StackAlignment;
    }
  
    if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
      StringRef Val = A->getValue();
      unsigned StackProbeSize = Opts.StackProbeSize;
      Val.getAsInteger(0, StackProbeSize);
      Opts.StackProbeSize = StackProbeSize;
    }
  
    Opts.NoStackArgProbe = Args.hasArg(OPT_mno_stack_arg_probe);
  
    if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
      StringRef Name = A->getValue();
      unsigned Method = llvm::StringSwitch<unsigned>(Name)
        .Case("legacy", CodeGenOptions::Legacy)
        .Case("non-legacy", CodeGenOptions::NonLegacy)
        .Case("mixed", CodeGenOptions::Mixed)
        .Default(~0U);
      if (Method == ~0U) {
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.setObjCDispatchMethod(
          static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
      }
    }
  
  
    if (Args.hasArg(OPT_fno_objc_convert_messages_to_runtime_calls))
      Opts.ObjCConvertMessagesToRuntimeCalls = 0;
  
    if (Args.getLastArg(OPT_femulated_tls) ||
        Args.getLastArg(OPT_fno_emulated_tls)) {
      Opts.ExplicitEmulatedTLS = true;
      Opts.EmulatedTLS =
          Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
    }
  
    if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
      StringRef Name = A->getValue();
      unsigned Model = llvm::StringSwitch<unsigned>(Name)
          .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
          .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
          .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
          .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
          .Default(~0U);
      if (Model == ~0U) {
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
        Success = false;
      } else {
        Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
      StringRef Val = A->getValue();
      if (Val == "ieee")
        Opts.FPDenormalMode = "ieee";
      else if (Val == "preserve-sign")
        Opts.FPDenormalMode = "preserve-sign";
      else if (Val == "positive-zero")
        Opts.FPDenormalMode = "positive-zero";
      else
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
    }
  
    if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
      if (A->getOption().matches(OPT_fpcc_struct_return)) {
        Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
      } else {
        assert(A->getOption().matches(OPT_freg_struct_return));
        Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
      }
    }
  
    Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
    Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
    bool NeedLocTracking = false;
  
    Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
    if (!Opts.OptRecordFile.empty())
      NeedLocTracking = true;
  
    if (Arg *A = Args.getLastArg(OPT_opt_record_passes)) {
      Opts.OptRecordPasses = A->getValue();
      NeedLocTracking = true;
    }
  
    if (Arg *A = Args.getLastArg(OPT_opt_record_format)) {
      Opts.OptRecordFormat = A->getValue();
      NeedLocTracking = true;
    }
  
    if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
      Opts.OptimizationRemarkPattern =
          GenerateOptimizationRemarkRegex(Diags, Args, A);
      NeedLocTracking = true;
    }
  
    if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
      Opts.OptimizationRemarkMissedPattern =
          GenerateOptimizationRemarkRegex(Diags, Args, A);
      NeedLocTracking = true;
    }
  
    if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
      Opts.OptimizationRemarkAnalysisPattern =
          GenerateOptimizationRemarkRegex(Diags, Args, A);
      NeedLocTracking = true;
    }
  
    Opts.DiagnosticsWithHotness =
        Args.hasArg(options::OPT_fdiagnostics_show_hotness);
    bool UsingSampleProfile = !Opts.SampleProfileFile.empty();
    bool UsingProfile = UsingSampleProfile ||
        (Opts.getProfileUse() != CodeGenOptions::ProfileNone);
  
    if (Opts.DiagnosticsWithHotness && !UsingProfile &&
        // An IR file will contain PGO as metadata
        IK.getLanguage() != InputKind::LLVM_IR)
      Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
          << "-fdiagnostics-show-hotness";
  
    Opts.DiagnosticsHotnessThreshold = getLastArgUInt64Value(
        Args, options::OPT_fdiagnostics_hotness_threshold_EQ, 0);
    if (Opts.DiagnosticsHotnessThreshold > 0 && !UsingProfile)
      Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
          << "-fdiagnostics-hotness-threshold=";
  
    // If the user requested to use a sample profile for PGO, then the
    // backend will need to track source location information so the profile
    // can be incorporated into the IR.
    if (UsingSampleProfile)
      NeedLocTracking = true;
  
    // If the user requested a flag that requires source locations available in
    // the backend, make sure that the backend tracks source location information.
    if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
      Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
  
    Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
  
    // Parse -fsanitize-recover= arguments.
    // FIXME: Report unrecoverable sanitizers incorrectly specified here.
    parseSanitizerKinds("-fsanitize-recover=",
                        Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
                        Opts.SanitizeRecover);
    parseSanitizerKinds("-fsanitize-trap=",
                        Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
                        Opts.SanitizeTrap);
  
    Opts.CudaGpuBinaryFileName =
        Args.getLastArgValue(OPT_fcuda_include_gpubinary);
  
    Opts.Backchain = Args.hasArg(OPT_mbackchain);
  
    Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
        Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
  
    Opts.EmitVersionIdentMetadata = Args.hasFlag(OPT_Qy, OPT_Qn, true);
  
    Opts.Addrsig = Args.hasArg(OPT_faddrsig);
  
    if (Arg *A = Args.getLastArg(OPT_msign_return_address_EQ)) {
      StringRef SignScope = A->getValue();
  
      if (SignScope.equals_lower("none"))
        Opts.setSignReturnAddress(CodeGenOptions::SignReturnAddressScope::None);
      else if (SignScope.equals_lower("all"))
        Opts.setSignReturnAddress(CodeGenOptions::SignReturnAddressScope::All);
      else if (SignScope.equals_lower("non-leaf"))
        Opts.setSignReturnAddress(
            CodeGenOptions::SignReturnAddressScope::NonLeaf);
      else
        Diags.Report(diag::err_drv_invalid_value)
            << A->getAsString(Args) << SignScope;
  
      if (Arg *A = Args.getLastArg(OPT_msign_return_address_key_EQ)) {
        StringRef SignKey = A->getValue();
        if (!SignScope.empty() && !SignKey.empty()) {
          if (SignKey.equals_lower("a_key"))
            Opts.setSignReturnAddressKey(
                CodeGenOptions::SignReturnAddressKeyValue::AKey);
          else if (SignKey.equals_lower("b_key"))
            Opts.setSignReturnAddressKey(
                CodeGenOptions::SignReturnAddressKeyValue::BKey);
          else
            Diags.Report(diag::err_drv_invalid_value)
                << A->getAsString(Args) << SignKey;
        }
      }
    }
  
    Opts.BranchTargetEnforcement = Args.hasArg(OPT_mbranch_target_enforce);
  
    Opts.KeepStaticConsts = Args.hasArg(OPT_fkeep_static_consts);
  
    Opts.SpeculativeLoadHardening = Args.hasArg(OPT_mspeculative_load_hardening);
  
    Opts.DefaultFunctionAttrs = Args.getAllArgValues(OPT_default_function_attr);
  
    Opts.PassPlugins = Args.getAllArgValues(OPT_fpass_plugin_EQ);
  
    Opts.SymbolPartition = Args.getLastArgValue(OPT_fsymbol_partition_EQ);
  
    Opts.CheckedCNullPtrArith = !Args.hasArg(OPT_fno_checkedc_null_ptr_arith);
  
    return Success;
  }
  
  static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
                                        ArgList &Args) {
    Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
    Opts.Targets = Args.getAllArgValues(OPT_MT);
    Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
    Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
    Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
    Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
    Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
    Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
    if (Args.hasArg(OPT_show_includes)) {
      // Writing both /showIncludes and preprocessor output to stdout
      // would produce interleaved output, so use stderr for /showIncludes.
      // This behaves the same as cl.exe, when /E, /EP or /P are passed.
      if (Args.hasArg(options::OPT_E) || Args.hasArg(options::OPT_P))
        Opts.ShowIncludesDest = ShowIncludesDestination::Stderr;
      else
        Opts.ShowIncludesDest = ShowIncludesDestination::Stdout;
    } else {
      Opts.ShowIncludesDest = ShowIncludesDestination::None;
    }
    Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
    Opts.ModuleDependencyOutputDir =
        Args.getLastArgValue(OPT_module_dependency_dir);
    if (Args.hasArg(OPT_MV))
      Opts.OutputFormat = DependencyOutputFormat::NMake;
    // Add sanitizer blacklists as extra dependencies.
    // They won't be discovered by the regular preprocessor, so
    // we let make / ninja to know about this implicit dependency.
    Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
    // Only the -fmodule-file=<file> form.
    for (const auto *A : Args.filtered(OPT_fmodule_file)) {
      StringRef Val = A->getValue();
      if (Val.find('=') == StringRef::npos)
        Opts.ExtraDeps.push_back(Val);
    }
  }
  
  static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
    // Color diagnostics default to auto ("on" if terminal supports) in the driver
    // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
    // Support both clang's -f[no-]color-diagnostics and gcc's
    // -f[no-]diagnostics-colors[=never|always|auto].
    enum {
      Colors_On,
      Colors_Off,
      Colors_Auto
    } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
    for (auto *A : Args) {
      const Option &O = A->getOption();
      if (O.matches(options::OPT_fcolor_diagnostics) ||
          O.matches(options::OPT_fdiagnostics_color)) {
        ShowColors = Colors_On;
      } else if (O.matches(options::OPT_fno_color_diagnostics) ||
                 O.matches(options::OPT_fno_diagnostics_color)) {
        ShowColors = Colors_Off;
      } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
        StringRef Value(A->getValue());
        if (Value == "always")
          ShowColors = Colors_On;
        else if (Value == "never")
          ShowColors = Colors_Off;
        else if (Value == "auto")
          ShowColors = Colors_Auto;
      }
    }
    return ShowColors == Colors_On ||
           (ShowColors == Colors_Auto &&
            llvm::sys::Process::StandardErrHasColors());
  }
  
  static bool checkVerifyPrefixes(const std::vector<std::string> &VerifyPrefixes,
                                  DiagnosticsEngine *Diags) {
    bool Success = true;
    for (const auto &Prefix : VerifyPrefixes) {
      // Every prefix must start with a letter and contain only alphanumeric
      // characters, hyphens, and underscores.
      auto BadChar = llvm::find_if(Prefix, [](char C) {
        return !isAlphanumeric(C) && C != '-' && C != '_';
      });
      if (BadChar != Prefix.end() || !isLetter(Prefix[0])) {
        Success = false;
        if (Diags) {
          Diags->Report(diag::err_drv_invalid_value) << "-verify=" << Prefix;
          Diags->Report(diag::note_drv_verify_prefix_spelling);
        }
      }
    }
    return Success;
  }
  
  bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
                                  DiagnosticsEngine *Diags,
                                  bool DefaultDiagColor, bool DefaultShowOpt) {
    bool Success = true;
  
    Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
    if (Arg *A =
            Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
      Opts.DiagnosticSerializationFile = A->getValue();
    Opts.IgnoreWarnings = Args.hasArg(OPT_w);
    Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
    Opts.Pedantic = Args.hasArg(OPT_pedantic);
    Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
    Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
    Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
    Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
                                   OPT_fno_show_column,
                                   /*Default=*/true);
    Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
    Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
    Opts.AbsolutePath = Args.hasArg(OPT_fdiagnostics_absolute_paths);
    Opts.ShowOptionNames =
        Args.hasFlag(OPT_fdiagnostics_show_option,
                     OPT_fno_diagnostics_show_option, DefaultShowOpt);
  
    llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
  
    // Default behavior is to not to show note include stacks.
    Opts.ShowNoteIncludeStack = false;
    if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
                                 OPT_fno_diagnostics_show_note_include_stack))
      if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
        Opts.ShowNoteIncludeStack = true;
  
    StringRef ShowOverloads =
      Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
    if (ShowOverloads == "best")
      Opts.setShowOverloads(Ovl_Best);
    else if (ShowOverloads == "all")
      Opts.setShowOverloads(Ovl_All);
    else {
      Success = false;
      if (Diags)
        Diags->Report(diag::err_drv_invalid_value)
        << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
        << ShowOverloads;
    }
  
    StringRef ShowCategory =
      Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
    if (ShowCategory == "none")
      Opts.ShowCategories = 0;
    else if (ShowCategory == "id")
      Opts.ShowCategories = 1;
    else if (ShowCategory == "name")
      Opts.ShowCategories = 2;
    else {
      Success = false;
      if (Diags)
        Diags->Report(diag::err_drv_invalid_value)
        << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
        << ShowCategory;
    }
  
    StringRef Format =
      Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
    if (Format == "clang")
      Opts.setFormat(DiagnosticOptions::Clang);
    else if (Format == "msvc")
      Opts.setFormat(DiagnosticOptions::MSVC);
    else if (Format == "msvc-fallback") {
      Opts.setFormat(DiagnosticOptions::MSVC);
      Opts.CLFallbackMode = true;
    } else if (Format == "vi")
      Opts.setFormat(DiagnosticOptions::Vi);
    else {
      Success = false;
      if (Diags)
        Diags->Report(diag::err_drv_invalid_value)
        << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
        << Format;
    }
  
    Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
    Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
    Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
    Opts.VerifyDiagnostics = Args.hasArg(OPT_verify) || Args.hasArg(OPT_verify_EQ);
    Opts.VerifyPrefixes = Args.getAllArgValues(OPT_verify_EQ);
    if (Args.hasArg(OPT_verify))
      Opts.VerifyPrefixes.push_back("expected");
    // Keep VerifyPrefixes in its original order for the sake of diagnostics, and
    // then sort it to prepare for fast lookup using std::binary_search.
    if (!checkVerifyPrefixes(Opts.VerifyPrefixes, Diags)) {
      Opts.VerifyDiagnostics = false;
      Success = false;
    }
    else
      llvm::sort(Opts.VerifyPrefixes);
    DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
    Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
      Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
      Diags, DiagMask);
    if (Args.hasArg(OPT_verify_ignore_unexpected))
      DiagMask = DiagnosticLevelMask::All;
    Opts.setVerifyIgnoreUnexpected(DiagMask);
    Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
    Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
    Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
    Opts.MacroBacktraceLimit =
        getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
                           DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
    Opts.TemplateBacktraceLimit = getLastArgIntValue(
        Args, OPT_ftemplate_backtrace_limit,
        DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
    Opts.ConstexprBacktraceLimit = getLastArgIntValue(
        Args, OPT_fconstexpr_backtrace_limit,
        DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
    Opts.SpellCheckingLimit = getLastArgIntValue(
        Args, OPT_fspell_checking_limit,
        DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
    Opts.SnippetLineLimit = getLastArgIntValue(
        Args, OPT_fcaret_diagnostics_max_lines,
        DiagnosticOptions::DefaultSnippetLineLimit, Diags);
    Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
                                      DiagnosticOptions::DefaultTabStop, Diags);
    if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
      Opts.TabStop = DiagnosticOptions::DefaultTabStop;
      if (Diags)
        Diags->Report(diag::warn_ignoring_ftabstop_value)
        << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
    }
    Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
    addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
    addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
  
    return Success;
  }
  
  static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
    Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
  }
  
  /// Parse the argument to the -ftest-module-file-extension
  /// command-line argument.
  ///
  /// \returns true on error, false on success.
  static bool parseTestModuleFileExtensionArg(StringRef Arg,
                                              std::string &BlockName,
                                              unsigned &MajorVersion,
                                              unsigned &MinorVersion,
                                              bool &Hashed,
                                              std::string &UserInfo) {
    SmallVector<StringRef, 5> Args;
    Arg.split(Args, ':', 5);
    if (Args.size() < 5)
      return true;
  
    BlockName = Args[0];
    if (Args[1].getAsInteger(10, MajorVersion)) return true;
    if (Args[2].getAsInteger(10, MinorVersion)) return true;
    if (Args[3].getAsInteger(2, Hashed)) return true;
    if (Args.size() > 4)
      UserInfo = Args[4];
    return false;
  }
  
  static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
                                     DiagnosticsEngine &Diags,
                                     bool &IsHeaderFile) {
    Opts.ProgramAction = frontend::ParseSyntaxOnly;
    if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
      switch (A->getOption().getID()) {
      default:
        llvm_unreachable("Invalid option in group!");
      case OPT_ast_list:
        Opts.ProgramAction = frontend::ASTDeclList; break;
      case OPT_ast_dump_all_EQ:
      case OPT_ast_dump_EQ: {
        unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
                           .CaseLower("default", ADOF_Default)
                           .CaseLower("json", ADOF_JSON)
                           .Default(std::numeric_limits<unsigned>::max());
  
        if (Val != std::numeric_limits<unsigned>::max())
          Opts.ASTDumpFormat = static_cast<ASTDumpOutputFormat>(Val);
        else {
          Diags.Report(diag::err_drv_invalid_value)
              << A->getAsString(Args) << A->getValue();
          Opts.ASTDumpFormat = ADOF_Default;
        }
        LLVM_FALLTHROUGH;
      }
      case OPT_ast_dump:
      case OPT_ast_dump_all:
      case OPT_ast_dump_lookups:
        Opts.ProgramAction = frontend::ASTDump; break;
      case OPT_ast_print:
        Opts.ProgramAction = frontend::ASTPrint; break;
      case OPT_ast_view:
        Opts.ProgramAction = frontend::ASTView; break;
      case OPT_compiler_options_dump:
        Opts.ProgramAction = frontend::DumpCompilerOptions; break;
      case OPT_dump_raw_tokens:
        Opts.ProgramAction = frontend::DumpRawTokens; break;
      case OPT_dump_tokens:
        Opts.ProgramAction = frontend::DumpTokens; break;
      case OPT_S:
        Opts.ProgramAction = frontend::EmitAssembly; break;
      case OPT_emit_llvm_bc:
        Opts.ProgramAction = frontend::EmitBC; break;
      case OPT_emit_html:
        Opts.ProgramAction = frontend::EmitHTML; break;
      case OPT_emit_llvm:
        Opts.ProgramAction = frontend::EmitLLVM; break;
      case OPT_emit_llvm_only:
        Opts.ProgramAction = frontend::EmitLLVMOnly; break;
      case OPT_emit_codegen_only:
        Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
      case OPT_emit_obj:
        Opts.ProgramAction = frontend::EmitObj; break;
      case OPT_fixit_EQ:
        Opts.FixItSuffix = A->getValue();
        LLVM_FALLTHROUGH;
      case OPT_fixit:
        Opts.ProgramAction = frontend::FixIt; break;
      case OPT_emit_module:
        Opts.ProgramAction = frontend::GenerateModule; break;
      case OPT_emit_module_interface:
        Opts.ProgramAction = frontend::GenerateModuleInterface; break;
      case OPT_emit_header_module:
        Opts.ProgramAction = frontend::GenerateHeaderModule; break;
      case OPT_emit_pch:
        Opts.ProgramAction = frontend::GeneratePCH; break;
      case OPT_emit_iterface_stubs: {
        llvm::Optional<frontend::ActionKind> ProgramAction =
            llvm::StringSwitch<llvm::Optional<frontend::ActionKind>>(
                Args.hasArg(OPT_iterface_stub_version_EQ)
                    ? Args.getLastArgValue(OPT_iterface_stub_version_EQ)
                    : "")
                .Case("experimental-yaml-elf-v1",
                      frontend::GenerateInterfaceYAMLExpV1)
                .Case("experimental-tapi-elf-v1",
                      frontend::GenerateInterfaceTBEExpV1)
                .Default(llvm::None);
        if (!ProgramAction)
          Diags.Report(diag::err_drv_invalid_value)
              << "Must specify a valid interface stub format type using "
              << "-interface-stub-version=<experimental-tapi-elf-v1 | "
                 "experimental-yaml-elf-v1>";
        Opts.ProgramAction = *ProgramAction;
        break;
      }
      case OPT_init_only:
        Opts.ProgramAction = frontend::InitOnly; break;
      case OPT_fsyntax_only:
        Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
      case OPT_module_file_info:
        Opts.ProgramAction = frontend::ModuleFileInfo; break;
      case OPT_verify_pch:
        Opts.ProgramAction = frontend::VerifyPCH; break;
      case OPT_print_preamble:
        Opts.ProgramAction = frontend::PrintPreamble; break;
      case OPT_E:
        Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
      case OPT_templight_dump:
        Opts.ProgramAction = frontend::TemplightDump; break;
      case OPT_rewrite_macros:
        Opts.ProgramAction = frontend::RewriteMacros; break;
      case OPT_rewrite_objc:
        Opts.ProgramAction = frontend::RewriteObjC; break;
      case OPT_rewrite_test:
        Opts.ProgramAction = frontend::RewriteTest; break;
      case OPT_analyze:
        Opts.ProgramAction = frontend::RunAnalysis; break;
      case OPT_migrate:
        Opts.ProgramAction = frontend::MigrateSource; break;
      case OPT_Eonly:
        Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
      case OPT_print_dependency_directives_minimized_source:
        Opts.ProgramAction =
            frontend::PrintDependencyDirectivesSourceMinimizerOutput;
        break;
      }
    }
  
    if (const Arg* A = Args.getLastArg(OPT_plugin)) {
      Opts.Plugins.emplace_back(A->getValue(0));
      Opts.ProgramAction = frontend::PluginAction;
      Opts.ActionName = A->getValue();
    }
    Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
    for (const auto *AA : Args.filtered(OPT_plugin_arg))
      Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
  
    for (const std::string &Arg :
           Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
      std::string BlockName;
      unsigned MajorVersion;
      unsigned MinorVersion;
      bool Hashed;
      std::string UserInfo;
      if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
                                          MinorVersion, Hashed, UserInfo)) {
        Diags.Report(diag::err_test_module_file_extension_format) << Arg;
  
        continue;
      }
  
      // Add the testing module file extension.
      Opts.ModuleFileExtensions.push_back(
          std::make_shared<TestModuleFileExtension>(
              BlockName, MajorVersion, MinorVersion, Hashed, UserInfo));
    }
  
    if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
      Opts.CodeCompletionAt =
        ParsedSourceLocation::FromString(A->getValue());
      if (Opts.CodeCompletionAt.FileName.empty())
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << A->getValue();
    }
    Opts.DisableFree = Args.hasArg(OPT_disable_free);
  
    Opts.OutputFile = Args.getLastArgValue(OPT_o);
    Opts.Plugins = Args.getAllArgValues(OPT_load);
    Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
    Opts.ShowHelp = Args.hasArg(OPT_help);
    Opts.ShowStats = Args.hasArg(OPT_print_stats);
    Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
    Opts.PrintSupportedCPUs = Args.hasArg(OPT_print_supported_cpus);
    Opts.TimeTrace = Args.hasArg(OPT_ftime_trace);
    Opts.ShowVersion = Args.hasArg(OPT_version);
    Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
    Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
    Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
    Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
    Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
    Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
    Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump, OPT_ast_dump_EQ);
    Opts.ASTDumpAll = Args.hasArg(OPT_ast_dump_all, OPT_ast_dump_all_EQ);
    Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
    Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
    Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
    Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
    Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
    // Only the -fmodule-file=<file> form.
    for (const auto *A : Args.filtered(OPT_fmodule_file)) {
      StringRef Val = A->getValue();
      if (Val.find('=') == StringRef::npos)
        Opts.ModuleFiles.push_back(Val);
    }
    Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
    Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
    Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
  
    Opts.CodeCompleteOpts.IncludeMacros
      = Args.hasArg(OPT_code_completion_macros);
    Opts.CodeCompleteOpts.IncludeCodePatterns
      = Args.hasArg(OPT_code_completion_patterns);
    Opts.CodeCompleteOpts.IncludeGlobals
      = !Args.hasArg(OPT_no_code_completion_globals);
    Opts.CodeCompleteOpts.IncludeNamespaceLevelDecls
      = !Args.hasArg(OPT_no_code_completion_ns_level_decls);
    Opts.CodeCompleteOpts.IncludeBriefComments
      = Args.hasArg(OPT_code_completion_brief_comments);
    Opts.CodeCompleteOpts.IncludeFixIts
      = Args.hasArg(OPT_code_completion_with_fixits);
  
    Opts.OverrideRecordLayoutsFile
      = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
    Opts.AuxTriple = Args.getLastArgValue(OPT_aux_triple);
    Opts.StatsFile = Args.getLastArgValue(OPT_stats_file);
  
    if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
                                       OPT_arcmt_modify,
                                       OPT_arcmt_migrate)) {
      switch (A->getOption().getID()) {
      default:
        llvm_unreachable("missed a case");
      case OPT_arcmt_check:
        Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
        break;
      case OPT_arcmt_modify:
        Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
        break;
      case OPT_arcmt_migrate:
        Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
        break;
      }
    }
    Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
    Opts.ARCMTMigrateReportOut
      = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
    Opts.ARCMTMigrateEmitARCErrors
      = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
  
    if (Args.hasArg(OPT_objcmt_migrate_literals))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
    if (Args.hasArg(OPT_objcmt_migrate_subscripting))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
    if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
    if (Args.hasArg(OPT_objcmt_migrate_property))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
    if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
    if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
    if (Args.hasArg(OPT_objcmt_migrate_annotation))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
    if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
    if (Args.hasArg(OPT_objcmt_migrate_instancetype))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
    if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
    if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
    if (Args.hasArg(OPT_objcmt_atomic_property))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
    if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
    if (Args.hasArg(OPT_objcmt_migrate_designated_init))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
    if (Args.hasArg(OPT_objcmt_migrate_all))
      Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
  
    Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
  
    if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
        Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
      Diags.Report(diag::err_drv_argument_not_allowed_with)
        << "ARC migration" << "ObjC migration";
    }
  
    InputKind DashX(InputKind::Unknown);
    if (const Arg *A = Args.getLastArg(OPT_x)) {
      StringRef XValue = A->getValue();
  
      // Parse suffixes: '<lang>(-header|[-module-map][-cpp-output])'.
      // FIXME: Supporting '<lang>-header-cpp-output' would be useful.
      bool Preprocessed = XValue.consume_back("-cpp-output");
      bool ModuleMap = XValue.consume_back("-module-map");
      IsHeaderFile =
          !Preprocessed && !ModuleMap && XValue.consume_back("-header");
  
      // Principal languages.
      DashX = llvm::StringSwitch<InputKind>(XValue)
                  .Case("c", InputKind::C)
                  .Case("cl", InputKind::OpenCL)
                  .Case("cuda", InputKind::CUDA)
                  .Case("hip", InputKind::HIP)
                  .Case("c++", InputKind::CXX)
                  .Case("objective-c", InputKind::ObjC)
                  .Case("objective-c++", InputKind::ObjCXX)
                  .Case("renderscript", InputKind::RenderScript)
                  .Default(InputKind::Unknown);
  
      // "objc[++]-cpp-output" is an acceptable synonym for
      // "objective-c[++]-cpp-output".
      if (DashX.isUnknown() && Preprocessed && !IsHeaderFile && !ModuleMap)
        DashX = llvm::StringSwitch<InputKind>(XValue)
                    .Case("objc", InputKind::ObjC)
                    .Case("objc++", InputKind::ObjCXX)
                    .Default(InputKind::Unknown);
  
      // Some special cases cannot be combined with suffixes.
      if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
        DashX = llvm::StringSwitch<InputKind>(XValue)
                    .Case("cpp-output", InputKind(InputKind::C).getPreprocessed())
                    .Case("assembler-with-cpp", InputKind::Asm)
                    .Cases("ast", "pcm",
                           InputKind(InputKind::Unknown, InputKind::Precompiled))
                    .Case("ir", InputKind::LLVM_IR)
                    .Default(InputKind::Unknown);
  
      if (DashX.isUnknown())
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << A->getValue();
  
      if (Preprocessed)
        DashX = DashX.getPreprocessed();
      if (ModuleMap)
        DashX = DashX.withFormat(InputKind::ModuleMap);
    }
  
    // '-' is the default input if none is given.
    std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
    Opts.Inputs.clear();
    if (Inputs.empty())
      Inputs.push_back("-");
    for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
      InputKind IK = DashX;
      if (IK.isUnknown()) {
        IK = FrontendOptions::getInputKindForExtension(
          StringRef(Inputs[i]).rsplit('.').second);
        // FIXME: Warn on this?
        if (IK.isUnknown())
          IK = InputKind::C;
        // FIXME: Remove this hack.
        if (i == 0)
          DashX = IK;
      }
  
      // The -emit-module action implicitly takes a module map.
      if (Opts.ProgramAction == frontend::GenerateModule &&
          IK.getFormat() == InputKind::Source)
        IK = IK.withFormat(InputKind::ModuleMap);
  
      Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
    }
  
    return DashX;
  }
  
  std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
                                                   void *MainAddr) {
    std::string ClangExecutable =
        llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
    return Driver::GetResourcesPath(ClangExecutable, CLANG_RESOURCE_DIR);
  }
  
  static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
                                    const std::string &WorkingDir) {
    Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
    Opts.Verbose = Args.hasArg(OPT_v);
    Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
    Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
    Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
    if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
      Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
    Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
  
    // Canonicalize -fmodules-cache-path before storing it.
    SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
    if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
      if (WorkingDir.empty())
        llvm::sys::fs::make_absolute(P);
      else
        llvm::sys::fs::make_absolute(WorkingDir, P);
    }
    llvm::sys::path::remove_dots(P);
    Opts.ModuleCachePath = P.str();
  
    Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
    // Only the -fmodule-file=<name>=<file> form.
    for (const auto *A : Args.filtered(OPT_fmodule_file)) {
      StringRef Val = A->getValue();
      if (Val.find('=') != StringRef::npos)
        Opts.PrebuiltModuleFiles.insert(Val.split('='));
    }
    for (const auto *A : Args.filtered(OPT_fprebuilt_module_path))
      Opts.AddPrebuiltModulePath(A->getValue());
    Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
    Opts.ModulesHashContent = Args.hasArg(OPT_fmodules_hash_content);
    Opts.ModulesValidateDiagnosticOptions =
        !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
    Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
    Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
    Opts.ModuleCachePruneInterval =
        getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
    Opts.ModuleCachePruneAfter =
        getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
    Opts.ModulesValidateOncePerBuildSession =
        Args.hasArg(OPT_fmodules_validate_once_per_build_session);
    Opts.BuildSessionTimestamp =
        getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
    Opts.ModulesValidateSystemHeaders =
        Args.hasArg(OPT_fmodules_validate_system_headers);
    if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
      Opts.ModuleFormat = A->getValue();
  
    for (const auto *A : Args.filtered(OPT_fmodules_ignore_macro)) {
      StringRef MacroDef = A->getValue();
      Opts.ModulesIgnoreMacros.insert(
          llvm::CachedHashString(MacroDef.split('=').first));
    }
  
    // Add -I..., -F..., and -index-header-map options in order.
    bool IsIndexHeaderMap = false;
    bool IsSysrootSpecified =
        Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
    for (const auto *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
      if (A->getOption().matches(OPT_index_header_map)) {
        // -index-header-map applies to the next -I or -F.
        IsIndexHeaderMap = true;
        continue;
      }
  
      frontend::IncludeDirGroup Group =
          IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
  
      bool IsFramework = A->getOption().matches(OPT_F);
      std::string Path = A->getValue();
  
      if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
        SmallString<32> Buffer;
        llvm::sys::path::append(Buffer, Opts.Sysroot,
                                llvm::StringRef(A->getValue()).substr(1));
        Path = Buffer.str();
      }
  
      Opts.AddPath(Path, Group, IsFramework,
                   /*IgnoreSysroot*/ true);
      IsIndexHeaderMap = false;
    }
  
    // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
    StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
    for (const auto *A :
         Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
      if (A->getOption().matches(OPT_iprefix))
        Prefix = A->getValue();
      else if (A->getOption().matches(OPT_iwithprefix))
        Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
      else
        Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
    }
  
    for (const auto *A : Args.filtered(OPT_idirafter))
      Opts.AddPath(A->getValue(), frontend::After, false, true);
    for (const auto *A : Args.filtered(OPT_iquote))
      Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
    for (const auto *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
      Opts.AddPath(A->getValue(), frontend::System, false,
                   !A->getOption().matches(OPT_iwithsysroot));
    for (const auto *A : Args.filtered(OPT_iframework))
      Opts.AddPath(A->getValue(), frontend::System, true, true);
    for (const auto *A : Args.filtered(OPT_iframeworkwithsysroot))
      Opts.AddPath(A->getValue(), frontend::System, /*IsFramework=*/true,
                   /*IgnoreSysRoot=*/false);
  
    // Add the paths for the various language specific isystem flags.
    for (const auto *A : Args.filtered(OPT_c_isystem))
      Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
    for (const auto *A : Args.filtered(OPT_cxx_isystem))
      Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
    for (const auto *A : Args.filtered(OPT_objc_isystem))
      Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
    for (const auto *A : Args.filtered(OPT_objcxx_isystem))
      Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
  
    // Add the internal paths from a driver that detects standard include paths.
    for (const auto *A :
         Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
      frontend::IncludeDirGroup Group = frontend::System;
      if (A->getOption().matches(OPT_internal_externc_isystem))
        Group = frontend::ExternCSystem;
      Opts.AddPath(A->getValue(), Group, false, true);
    }
  
    // Add the path prefixes which are implicitly treated as being system headers.
    for (const auto *A :
         Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
      Opts.AddSystemHeaderPrefix(
          A->getValue(), A->getOption().matches(OPT_system_header_prefix));
  
    for (const auto *A : Args.filtered(OPT_ivfsoverlay))
      Opts.AddVFSOverlayFile(A->getValue());
  }
  
  void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
                                           const llvm::Triple &T,
                                           PreprocessorOptions &PPOpts,
                                           LangStandard::Kind LangStd) {
    // Set some properties which depend solely on the input kind; it would be nice
    // to move these to the language standard, and have the driver resolve the
    // input kind + language standard.
    //
    // FIXME: Perhaps a better model would be for a single source file to have
    // multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
    // simultaneously active?
    if (IK.getLanguage() == InputKind::Asm) {
      Opts.AsmPreprocessor = 1;
    } else if (IK.isObjectiveC()) {
      Opts.ObjC = 1;
    }
  
    if (LangStd == LangStandard::lang_unspecified) {
      // Based on the base language, pick one.
      switch (IK.getLanguage()) {
      case InputKind::Unknown:
      case InputKind::LLVM_IR:
        llvm_unreachable("Invalid input kind!");
      case InputKind::OpenCL:
        LangStd = LangStandard::lang_opencl10;
        break;
      case InputKind::CUDA:
        LangStd = LangStandard::lang_cuda;
        break;
      case InputKind::Asm:
      case InputKind::C:
  #if defined(CLANG_DEFAULT_STD_C)
        LangStd = CLANG_DEFAULT_STD_C;
  #else
        // The PS4 uses C99 as the default C standard.
        if (T.isPS4())
          LangStd = LangStandard::lang_gnu99;
        else
          LangStd = LangStandard::lang_gnu11;
  #endif
        break;
      case InputKind::ObjC:
  #if defined(CLANG_DEFAULT_STD_C)
        LangStd = CLANG_DEFAULT_STD_C;
  #else
        LangStd = LangStandard::lang_gnu11;
  #endif
        break;
      case InputKind::CXX:
      case InputKind::ObjCXX:
  #if defined(CLANG_DEFAULT_STD_CXX)
        LangStd = CLANG_DEFAULT_STD_CXX;
  #else
        LangStd = LangStandard::lang_gnucxx14;
  #endif
        break;
      case InputKind::RenderScript:
        LangStd = LangStandard::lang_c99;
        break;
      case InputKind::HIP:
        LangStd = LangStandard::lang_hip;
        break;
      }
    }
  
    const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
    Opts.LineComment = Std.hasLineComments();
    Opts.C99 = Std.isC99();
    Opts.C11 = Std.isC11();
    Opts.C17 = Std.isC17();
    Opts.C2x = Std.isC2x();
    Opts.CPlusPlus = Std.isCPlusPlus();
    Opts.CPlusPlus11 = Std.isCPlusPlus11();
    Opts.CPlusPlus14 = Std.isCPlusPlus14();
    Opts.CPlusPlus17 = Std.isCPlusPlus17();
    Opts.CPlusPlus2a = Std.isCPlusPlus2a();
    Opts.Digraphs = Std.hasDigraphs();
    Opts.GNUMode = Std.isGNUMode();
    Opts.GNUInline = !Opts.C99 && !Opts.CPlusPlus;
    Opts.HexFloats = Std.hasHexFloats();
    Opts.ImplicitInt = Std.hasImplicitInt();
  
    // Set OpenCL Version.
    Opts.OpenCL = Std.isOpenCL();
    if (LangStd == LangStandard::lang_opencl10)
      Opts.OpenCLVersion = 100;
    else if (LangStd == LangStandard::lang_opencl11)
      Opts.OpenCLVersion = 110;
    else if (LangStd == LangStandard::lang_opencl12)
      Opts.OpenCLVersion = 120;
    else if (LangStd == LangStandard::lang_opencl20)
      Opts.OpenCLVersion = 200;
    else if (LangStd == LangStandard::lang_openclcpp)
      Opts.OpenCLCPlusPlusVersion = 100;
  
    // OpenCL has some additional defaults.
    if (Opts.OpenCL) {
      Opts.AltiVec = 0;
      Opts.ZVector = 0;
      Opts.LaxVectorConversions = 0;
      Opts.setDefaultFPContractMode(LangOptions::FPC_On);
      Opts.NativeHalfType = 1;
      Opts.NativeHalfArgsAndReturns = 1;
      Opts.OpenCLCPlusPlus = Opts.CPlusPlus;
  
      // Include default header file for OpenCL.
      if (Opts.IncludeDefaultHeader) {
        if (Opts.DeclareOpenCLBuiltins) {
          // Only include base header file for builtin types and constants.
          PPOpts.Includes.push_back("opencl-c-base.h");
        } else {
          PPOpts.Includes.push_back("opencl-c.h");
        }
      }
    }
  
    Opts.HIP = IK.getLanguage() == InputKind::HIP;
    Opts.CUDA = IK.getLanguage() == InputKind::CUDA || Opts.HIP;
    if (Opts.CUDA)
      // Set default FP_CONTRACT to FAST.
      Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
  
    Opts.RenderScript = IK.getLanguage() == InputKind::RenderScript;
    if (Opts.RenderScript) {
      Opts.NativeHalfType = 1;
      Opts.NativeHalfArgsAndReturns = 1;
    }
  
    // OpenCL and C++ both have bool, true, false keywords.
    Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
  
    // OpenCL has half keyword
    Opts.Half = Opts.OpenCL;
  
    // C++ has wchar_t keyword.
    Opts.WChar = Opts.CPlusPlus;
  
    Opts.GNUKeywords = Opts.GNUMode;
    Opts.CXXOperatorNames = Opts.CPlusPlus;
  
    Opts.AlignedAllocation = Opts.CPlusPlus17;
  
    Opts.DollarIdents = !Opts.AsmPreprocessor;
  
    // Enable [[]] attributes in C++11 and C2x by default.
    Opts.DoubleSquareBracketAttributes = Opts.CPlusPlus11 || Opts.C2x;
  
    Opts.CheckedC = (IK.getLanguage() == InputKind::C);
  }
  
  /// Attempt to parse a visibility value out of the given argument.
  static Visibility parseVisibility(Arg *arg, ArgList &args,
                                    DiagnosticsEngine &diags) {
    StringRef value = arg->getValue();
    if (value == "default") {
      return DefaultVisibility;
    } else if (value == "hidden" || value == "internal") {
      return HiddenVisibility;
    } else if (value == "protected") {
      // FIXME: diagnose if target does not support protected visibility
      return ProtectedVisibility;
    }
  
    diags.Report(diag::err_drv_invalid_value)
      << arg->getAsString(args) << value;
    return DefaultVisibility;
  }
  
  /// Check if input file kind and language standard are compatible.
  static bool IsInputCompatibleWithStandard(InputKind IK,
                                            const LangStandard &S) {
    switch (IK.getLanguage()) {
    case InputKind::Unknown:
    case InputKind::LLVM_IR:
      llvm_unreachable("should not parse language flags for this input");
  
    case InputKind::C:
    case InputKind::ObjC:
    case InputKind::RenderScript:
      return S.getLanguage() == InputKind::C;
  
    case InputKind::OpenCL:
      return S.getLanguage() == InputKind::OpenCL;
  
    case InputKind::CXX:
    case InputKind::ObjCXX:
      return S.getLanguage() == InputKind::CXX;
  
    case InputKind::CUDA:
      // FIXME: What -std= values should be permitted for CUDA compilations?
      return S.getLanguage() == InputKind::CUDA ||
             S.getLanguage() == InputKind::CXX;
  
    case InputKind::HIP:
      return S.getLanguage() == InputKind::CXX ||
             S.getLanguage() == InputKind::HIP;
  
    case InputKind::Asm:
      // Accept (and ignore) all -std= values.
      // FIXME: The -std= value is not ignored; it affects the tokenization
      // and preprocessing rules if we're preprocessing this asm input.
      return true;
    }
  
    llvm_unreachable("unexpected input language");
  }
  
  /// Get language name for given input kind.
  static const StringRef GetInputKindName(InputKind IK) {
    switch (IK.getLanguage()) {
    case InputKind::C:
      return "C";
    case InputKind::ObjC:
      return "Objective-C";
    case InputKind::CXX:
      return "C++";
    case InputKind::ObjCXX:
      return "Objective-C++";
    case InputKind::OpenCL:
      return "OpenCL";
    case InputKind::CUDA:
      return "CUDA";
    case InputKind::RenderScript:
      return "RenderScript";
    case InputKind::HIP:
      return "HIP";
  
    case InputKind::Asm:
      return "Asm";
    case InputKind::LLVM_IR:
      return "LLVM IR";
  
    case InputKind::Unknown:
      break;
    }
    llvm_unreachable("unknown input language");
  }
  
  static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
                            const TargetOptions &TargetOpts,
                            PreprocessorOptions &PPOpts,
                            DiagnosticsEngine &Diags) {
    // FIXME: Cleanup per-file based stuff.
    LangStandard::Kind LangStd = LangStandard::lang_unspecified;
    if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
      LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
  #define LANGSTANDARD(id, name, lang, desc, features) \
        .Case(name, LangStandard::lang_##id)
  #define LANGSTANDARD_ALIAS(id, alias) \
        .Case(alias, LangStandard::lang_##id)
  #include "clang/Frontend/LangStandards.def"
        .Default(LangStandard::lang_unspecified);
      if (LangStd == LangStandard::lang_unspecified) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << A->getValue();
        // Report supported standards with short description.
        for (unsigned KindValue = 0;
             KindValue != LangStandard::lang_unspecified;
             ++KindValue) {
          const LangStandard &Std = LangStandard::getLangStandardForKind(
            static_cast<LangStandard::Kind>(KindValue));
          if (IsInputCompatibleWithStandard(IK, Std)) {
            auto Diag = Diags.Report(diag::note_drv_use_standard);
            Diag << Std.getName() << Std.getDescription();
            unsigned NumAliases = 0;
  #define LANGSTANDARD(id, name, lang, desc, features)
  #define LANGSTANDARD_ALIAS(id, alias) \
            if (KindValue == LangStandard::lang_##id) ++NumAliases;
  #define LANGSTANDARD_ALIAS_DEPR(id, alias)
  #include "clang/Frontend/LangStandards.def"
            Diag << NumAliases;
  #define LANGSTANDARD(id, name, lang, desc, features)
  #define LANGSTANDARD_ALIAS(id, alias) \
            if (KindValue == LangStandard::lang_##id) Diag << alias;
  #define LANGSTANDARD_ALIAS_DEPR(id, alias)
  #include "clang/Frontend/LangStandards.def"
          }
        }
      } else {
        // Valid standard, check to make sure language and standard are
        // compatible.
        const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
        if (!IsInputCompatibleWithStandard(IK, Std)) {
          Diags.Report(diag::err_drv_argument_not_allowed_with)
            << A->getAsString(Args) << GetInputKindName(IK);
        }
      }
    }
  
    if (Args.hasArg(OPT_fno_dllexport_inlines))
      Opts.DllExportInlines = false;
  
    if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
      StringRef Name = A->getValue();
      if (Name == "full" || Name == "branch") {
        Opts.CFProtectionBranch = 1;
      }
    }
    // -cl-std only applies for OpenCL language standards.
    // Override the -std option in this case.
    if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
      LangStandard::Kind OpenCLLangStd
        = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
          .Cases("cl", "CL", LangStandard::lang_opencl10)
          .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
          .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
          .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
          .Case("c++", LangStandard::lang_openclcpp)
          .Default(LangStandard::lang_unspecified);
  
      if (OpenCLLangStd == LangStandard::lang_unspecified) {
        Diags.Report(diag::err_drv_invalid_value)
          << A->getAsString(Args) << A->getValue();
      }
      else
        LangStd = OpenCLLangStd;
    }
  
    Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
    Opts.DeclareOpenCLBuiltins = Args.hasArg(OPT_fdeclare_opencl_builtins);
  
    llvm::Triple T(TargetOpts.Triple);
    CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
  
    // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
    // This option should be deprecated for CL > 1.0 because
    // this option was added for compatibility with OpenCL 1.0.
    if (Args.getLastArg(OPT_cl_strict_aliasing)
         && Opts.OpenCLVersion > 100) {
      Diags.Report(diag::warn_option_invalid_ocl_version)
          << Opts.getOpenCLVersionTuple().getAsString()
          << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
    }
  
    // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
    // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
    // while a subset (the non-C++ GNU keywords) is provided by GCC's
    // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
    // name, as it doesn't seem a useful distinction.
    Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
                                    Opts.GNUKeywords);
  
    Opts.Digraphs = Args.hasFlag(OPT_fdigraphs, OPT_fno_digraphs, Opts.Digraphs);
  
    if (Args.hasArg(OPT_fno_operator_names))
      Opts.CXXOperatorNames = 0;
  
    if (Args.hasArg(OPT_fcuda_is_device))
      Opts.CUDAIsDevice = 1;
  
    if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
      Opts.CUDAAllowVariadicFunctions = 1;
  
    if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
      Opts.CUDAHostDeviceConstexpr = 0;
  
    if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
      Opts.CUDADeviceApproxTranscendentals = 1;
  
    Opts.GPURelocatableDeviceCode = Args.hasArg(OPT_fgpu_rdc);
  
    if (Opts.ObjC) {
      if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
        StringRef value = arg->getValue();
        if (Opts.ObjCRuntime.tryParse(value))
          Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
      }
  
      if (Args.hasArg(OPT_fobjc_gc_only))
        Opts.setGC(LangOptions::GCOnly);
      else if (Args.hasArg(OPT_fobjc_gc))
        Opts.setGC(LangOptions::HybridGC);
      else if (Args.hasArg(OPT_fobjc_arc)) {
        Opts.ObjCAutoRefCount = 1;
        if (!Opts.ObjCRuntime.allowsARC())
          Diags.Report(diag::err_arc_unsupported_on_runtime);
      }
  
      // ObjCWeakRuntime tracks whether the runtime supports __weak, not
      // whether the feature is actually enabled.  This is predominantly
      // determined by -fobjc-runtime, but we allow it to be overridden
      // from the command line for testing purposes.
      if (Args.hasArg(OPT_fobjc_runtime_has_weak))
        Opts.ObjCWeakRuntime = 1;
      else
        Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
  
      // ObjCWeak determines whether __weak is actually enabled.
      // Note that we allow -fno-objc-weak to disable this even in ARC mode.
      if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
        if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
          assert(!Opts.ObjCWeak);
        } else if (Opts.getGC() != LangOptions::NonGC) {
          Diags.Report(diag::err_objc_weak_with_gc);
        } else if (!Opts.ObjCWeakRuntime) {
          Diags.Report(diag::err_objc_weak_unsupported);
        } else {
          Opts.ObjCWeak = 1;
        }
      } else if (Opts.ObjCAutoRefCount) {
        Opts.ObjCWeak = Opts.ObjCWeakRuntime;
      }
  
      if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
        Opts.ObjCInferRelatedResultType = 0;
  
      if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
        Opts.ObjCSubscriptingLegacyRuntime =
          (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
    }
  
    if (Args.hasArg(OPT_fgnu89_inline)) {
      if (Opts.CPlusPlus)
        Diags.Report(diag::err_drv_argument_not_allowed_with)
          << "-fgnu89-inline" << GetInputKindName(IK);
      else
        Opts.GNUInline = 1;
    }
  
    if (Args.hasArg(OPT_fapple_kext)) {
      if (!Opts.CPlusPlus)
        Diags.Report(diag::warn_c_kext);
      else
        Opts.AppleKext = 1;
    }
  
    if (Args.hasArg(OPT_print_ivar_layout))
      Opts.ObjCGCBitmapPrint = 1;
  
    if (Args.hasArg(OPT_fno_constant_cfstrings))
      Opts.NoConstantCFStrings = 1;
    if (const auto *A = Args.getLastArg(OPT_fcf_runtime_abi_EQ))
      Opts.CFRuntime =
          llvm::StringSwitch<LangOptions::CoreFoundationABI>(A->getValue())
              .Cases("unspecified", "standalone", "objc",
                     LangOptions::CoreFoundationABI::ObjectiveC)
              .Cases("swift", "swift-5.0",
                     LangOptions::CoreFoundationABI::Swift5_0)
              .Case("swift-4.2", LangOptions::CoreFoundationABI::Swift4_2)
              .Case("swift-4.1", LangOptions::CoreFoundationABI::Swift4_1)
              .Default(LangOptions::CoreFoundationABI::ObjectiveC);
  
    if (Args.hasArg(OPT_fzvector))
      Opts.ZVector = 1;
  
    if (Args.hasArg(OPT_pthread))
      Opts.POSIXThreads = 1;
  
    // The value-visibility mode defaults to "default".
    if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
      Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
    } else {
      Opts.setValueVisibilityMode(DefaultVisibility);
    }
  
    // The type-visibility mode defaults to the value-visibility mode.
    if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
      Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
    } else {
      Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
    }
  
    if (Args.hasArg(OPT_fvisibility_inlines_hidden))
      Opts.InlineVisibilityHidden = 1;
  
    if (Args.hasArg(OPT_fvisibility_global_new_delete_hidden))
      Opts.GlobalAllocationFunctionVisibilityHidden = 1;
  
    if (Args.hasArg(OPT_fapply_global_visibility_to_externs))
      Opts.SetVisibilityForExternDecls = 1;
  
    if (Args.hasArg(OPT_ftrapv)) {
      Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
      // Set the handler, if one is specified.
      Opts.OverflowHandler =
          Args.getLastArgValue(OPT_ftrapv_handler);
    }
    else if (Args.hasArg(OPT_fwrapv))
      Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
  
    Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
    Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
    Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
    Opts.MSCompatibilityVersion = 0;
    if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
      VersionTuple VT;
      if (VT.tryParse(A->getValue()))
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
                                                  << A->getValue();
      Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
                                    VT.getMinor().getValueOr(0) * 100000 +
                                    VT.getSubminor().getValueOr(0);
    }
  
    // Mimicking gcc's behavior, trigraphs are only enabled if -trigraphs
    // is specified, or -std is set to a conforming mode.
    // Trigraphs are disabled by default in c++1z onwards.
    Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus17;
    Opts.Trigraphs =
        Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
  
    Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
                                     OPT_fno_dollars_in_identifiers,
                                     Opts.DollarIdents);
    Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
    Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
    Opts.Borland = Args.hasArg(OPT_fborland_extensions);
    if (Args.hasArg(OPT_fcheckedc_extension)) {
      std::string disallowed;
      if (Opts.CUDA)
        disallowed = "CUDA";
      else if (Opts.OpenCL)
        disallowed = "OpenCL";
      else if (Opts.ObjC) {
        if (Opts.CPlusPlus)
          disallowed = "Objective C/C++";
        else
          disallowed = "Objective C";
      }
      else if (Opts.CPlusPlus) {
        disallowed = "C++";
      }
  
      if (disallowed.size() > 0) {
        Diags.Report(diag::warn_drv_checkedc_extension_notsupported) <<
          "-fcheckedc-extension" << disallowed;
      } else
        Opts.CheckedC = true;
    }
  
    if (Args.hasArg(OPT_f3c_tool))
      Opts._3C = true;
  
    if (Args.hasArg(OPT_fno_checkedc_extension))
      Opts.CheckedC = false;
  
    if (Args.hasArg(OPT_fdump_inferred_bounds))
      Opts.DumpInferredBounds = true;
  
    if (Args.hasArg(OPT_finject_verifier_calls))
      Opts.InjectVerifierCalls = true;
  
    if (Args.hasArg(OPT_funchecked_pointers_dynamic_check))
      Opts.UncheckedPointersDynamicCheck = true;
  
    if (Args.hasArg(OPT_fdump_extracted_comparison_facts))
      Opts.DumpExtractedComparisonFacts = true;
  
    if (Args.hasArg(OPT_fdump_widened_bounds))
      Opts.DumpWidenedBounds = true;
  
    if (Args.hasArg(OPT_fdump_preorder_ast))
      Opts.DumpPreorderAST = true;
  
    if (Args.hasArg(OPT_fdump_checking_state))
      Opts.DumpCheckingState = true;
  
    Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
    Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
                                     Opts.ConstStrings);
    if (Args.hasArg(OPT_fno_lax_vector_conversions))
      Opts.LaxVectorConversions = 0;
    if (Args.hasArg(OPT_fno_threadsafe_statics))
      Opts.ThreadsafeStatics = 0;
    Opts.Exceptions = Args.hasArg(OPT_fexceptions);
    Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
    Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
  
    // -ffixed-point
    Opts.FixedPoint =
        Args.hasFlag(OPT_ffixed_point, OPT_fno_fixed_point, /*Default=*/false) &&
        !Opts.CPlusPlus;
    Opts.PaddingOnUnsignedFixedPoint =
        Args.hasFlag(OPT_fpadding_on_unsigned_fixed_point,
                     OPT_fno_padding_on_unsigned_fixed_point,
                     /*Default=*/false) &&
        Opts.FixedPoint;
  
    // Handle exception personalities
    Arg *A = Args.getLastArg(options::OPT_fsjlj_exceptions,
                             options::OPT_fseh_exceptions,
                             options::OPT_fdwarf_exceptions);
    if (A) {
      const Option &Opt = A->getOption();
      llvm::Triple T(TargetOpts.Triple);
      if (T.isWindowsMSVCEnvironment())
        Diags.Report(diag::err_fe_invalid_exception_model)
            << Opt.getName() << T.str();
  
      Opts.SjLjExceptions = Opt.matches(options::OPT_fsjlj_exceptions);
      Opts.SEHExceptions = Opt.matches(options::OPT_fseh_exceptions);
      Opts.DWARFExceptions = Opt.matches(options::OPT_fdwarf_exceptions);
    }
  
    Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
    Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
  
    Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
    Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
    Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
      && Opts.OpenCLVersion == 200);
    Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
    Opts.Coroutines = Opts.CPlusPlus2a || Args.hasArg(OPT_fcoroutines_ts);
  
    Opts.DoubleSquareBracketAttributes =
        Args.hasFlag(OPT_fdouble_square_bracket_attributes,
                     OPT_fno_double_square_bracket_attributes,
                     Opts.DoubleSquareBracketAttributes);
  
    Opts.CPlusPlusModules = Opts.CPlusPlus2a;
    Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
    Opts.Modules =
        Args.hasArg(OPT_fmodules) || Opts.ModulesTS || Opts.CPlusPlusModules;
    Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
    Opts.ModulesDeclUse =
        Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
    // FIXME: We only need this in C++ modules / Modules TS if we might textually
    // enter a different module (eg, when building a header unit).
    Opts.ModulesLocalVisibility =
        Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS ||
        Opts.CPlusPlusModules;
    Opts.ModulesCodegen = Args.hasArg(OPT_fmodules_codegen);
    Opts.ModulesDebugInfo = Args.hasArg(OPT_fmodules_debuginfo);
    Opts.ModulesSearchAll = Opts.Modules &&
      !Args.hasArg(OPT_fno_modules_search_all) &&
      Args.hasArg(OPT_fmodules_search_all);
    Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
    Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
    Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
    Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
    Opts.Char8 = Args.hasFlag(OPT_fchar8__t, OPT_fno_char8__t, Opts.CPlusPlus2a);
    if (const Arg *A = Args.getLastArg(OPT_fwchar_type_EQ)) {
      Opts.WCharSize = llvm::StringSwitch<unsigned>(A->getValue())
                           .Case("char", 1)
                           .Case("short", 2)
                           .Case("int", 4)
                           .Default(0);
      if (Opts.WCharSize == 0)
        Diags.Report(diag::err_fe_invalid_wchar_type) << A->getValue();
    }
    Opts.WCharIsSigned = Args.hasFlag(OPT_fsigned_wchar, OPT_fno_signed_wchar, true);
    Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
    Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
    Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
    if (!Opts.NoBuiltin)
      getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
    Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
    Opts.RelaxedTemplateTemplateArgs =
        Args.hasArg(OPT_frelaxed_template_template_args);
    Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
    Opts.AlignedAllocation =
        Args.hasFlag(OPT_faligned_allocation, OPT_fno_aligned_allocation,
                     Opts.AlignedAllocation);
    Opts.AlignedAllocationUnavailable =
        Opts.AlignedAllocation && Args.hasArg(OPT_aligned_alloc_unavailable);
    Opts.NewAlignOverride =
        getLastArgIntValue(Args, OPT_fnew_alignment_EQ, 0, Diags);
    if (Opts.NewAlignOverride && !llvm::isPowerOf2_32(Opts.NewAlignOverride)) {
      Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
      Diags.Report(diag::err_fe_invalid_alignment) << A->getAsString(Args)
                                                   << A->getValue();
      Opts.NewAlignOverride = 0;
    }
    Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
    Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
    Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
    Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
    Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
    Opts.InstantiationDepth =
        getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
    Opts.ArrowDepth =
        getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
    Opts.ConstexprCallDepth =
        getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
    Opts.ConstexprStepLimit =
        getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
    Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
    Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
    Opts.NumLargeByValueCopy =
        getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
    Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
    Opts.ObjCConstantStringClass =
      Args.getLastArgValue(OPT_fconstant_string_class);
    Opts.ObjCDefaultSynthProperties =
      !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
    Opts.EncodeExtendedBlockSig =
      Args.hasArg(OPT_fencode_extended_block_signature);
    Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
    Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
    Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
    Opts.AlignDouble = Args.hasArg(OPT_malign_double);
    Opts.LongDoubleSize = Args.hasArg(OPT_mlong_double_128)
                              ? 128
                              : Args.hasArg(OPT_mlong_double_64) ? 64 : 0;
    Opts.PPCIEEELongDouble = Args.hasArg(OPT_mabi_EQ_ieeelongdouble);
    Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
    Opts.ROPI = Args.hasArg(OPT_fropi);
    Opts.RWPI = Args.hasArg(OPT_frwpi);
    Opts.PIE = Args.hasArg(OPT_pic_is_pie);
    Opts.Static = Args.hasArg(OPT_static_define);
    Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
    Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
                          || Args.hasArg(OPT_fdump_record_layouts);
    Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
    Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
    Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
    Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
    Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
    Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
    Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
    Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
    Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
    Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
    Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
    Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
    Opts.ModuleName = Args.getLastArgValue(OPT_fmodule_name_EQ);
    Opts.CurrentModule = Opts.ModuleName;
    Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
    Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
    llvm::sort(Opts.ModuleFeatures);
    Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
    Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
    // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
    // is enabled.
    Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
                              | Opts.NativeHalfArgsAndReturns;
    Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
    Opts.Cmse = Args.hasArg(OPT_mcmse); // Armv8-M Security Extensions
  
    // __declspec is enabled by default for the PS4 by the driver, and also
    // enabled for Microsoft Extensions or Borland Extensions, here.
    //
    // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
    // CUDA extension. However, it is required for supporting
    // __clang_cuda_builtin_vars.h, which uses __declspec(property). Once that has
    // been rewritten in terms of something more generic, remove the Opts.CUDA
    // term here.
    Opts.DeclSpecKeyword =
        Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
                     (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
  
    if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
      switch (llvm::StringSwitch<unsigned>(A->getValue())
        .Case("target", LangOptions::ASMM_Target)
        .Case("no", LangOptions::ASMM_Off)
        .Case("yes", LangOptions::ASMM_On)
        .Default(255)) {
      default:
        Diags.Report(diag::err_drv_invalid_value)
          << "-faddress-space-map-mangling=" << A->getValue();
        break;
      case LangOptions::ASMM_Target:
        Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
        break;
      case LangOptions::ASMM_On:
        Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
        break;
      case LangOptions::ASMM_Off:
        Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
        break;
      }
    }
  
    if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
      LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
          llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
              A->getValue())
              .Case("single",
                    LangOptions::PPTMK_FullGeneralitySingleInheritance)
              .Case("multiple",
                    LangOptions::PPTMK_FullGeneralityMultipleInheritance)
              .Case("virtual",
                    LangOptions::PPTMK_FullGeneralityVirtualInheritance)
              .Default(LangOptions::PPTMK_BestCase);
      if (InheritanceModel == LangOptions::PPTMK_BestCase)
        Diags.Report(diag::err_drv_invalid_value)
            << "-fms-memptr-rep=" << A->getValue();
  
      Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
    }
  
    // Check for MS default calling conventions being specified.
    if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
      LangOptions::DefaultCallingConvention DefaultCC =
          llvm::StringSwitch<LangOptions::DefaultCallingConvention>(A->getValue())
              .Case("cdecl", LangOptions::DCC_CDecl)
              .Case("fastcall", LangOptions::DCC_FastCall)
              .Case("stdcall", LangOptions::DCC_StdCall)
              .Case("vectorcall", LangOptions::DCC_VectorCall)
              .Case("regcall", LangOptions::DCC_RegCall)
              .Default(LangOptions::DCC_None);
      if (DefaultCC == LangOptions::DCC_None)
        Diags.Report(diag::err_drv_invalid_value)
            << "-fdefault-calling-conv=" << A->getValue();
  
      llvm::Triple T(TargetOpts.Triple);
      llvm::Triple::ArchType Arch = T.getArch();
      bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
                        DefaultCC == LangOptions::DCC_StdCall) &&
                       Arch != llvm::Triple::x86;
      emitError |= (DefaultCC == LangOptions::DCC_VectorCall ||
                    DefaultCC == LangOptions::DCC_RegCall) &&
                   !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
      if (emitError)
        Diags.Report(diag::err_drv_argument_not_allowed_with)
            << A->getSpelling() << T.getTriple();
      else
        Opts.setDefaultCallingConv(DefaultCC);
    }
  
    // -mrtd option
    if (Arg *A = Args.getLastArg(OPT_mrtd)) {
      if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
        Diags.Report(diag::err_drv_argument_not_allowed_with)
            << A->getSpelling() << "-fdefault-calling-conv";
      else {
        llvm::Triple T(TargetOpts.Triple);
        if (T.getArch() != llvm::Triple::x86)
          Diags.Report(diag::err_drv_argument_not_allowed_with)
              << A->getSpelling() << T.getTriple();
        else
          Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
      }
    }
  
    // Check if -fopenmp is specified.
    Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
    // Check if -fopenmp-simd is specified.
    bool IsSimdSpecified =
        Args.hasFlag(options::OPT_fopenmp_simd, options::OPT_fno_openmp_simd,
                     /*Default=*/false);
    Opts.OpenMPSimd = !Opts.OpenMP && IsSimdSpecified;
    Opts.OpenMPUseTLS =
        Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
    Opts.OpenMPIsDevice =
        Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
    bool IsTargetSpecified =
        Opts.OpenMPIsDevice || Args.hasArg(options::OPT_fopenmp_targets_EQ);
  
    if (Opts.OpenMP || Opts.OpenMPSimd) {
      if (int Version = getLastArgIntValue(
              Args, OPT_fopenmp_version_EQ,
              (IsSimdSpecified || IsTargetSpecified) ? 45 : Opts.OpenMP, Diags))
        Opts.OpenMP = Version;
      else if (IsSimdSpecified || IsTargetSpecified)
        Opts.OpenMP = 45;
      // Provide diagnostic when a given target is not expected to be an OpenMP
      // device or host.
      if (!Opts.OpenMPIsDevice) {
        switch (T.getArch()) {
        default:
          break;
        // Add unsupported host targets here:
        case llvm::Triple::nvptx:
        case llvm::Triple::nvptx64:
          Diags.Report(diag::err_drv_omp_host_target_not_supported)
              << TargetOpts.Triple;
          break;
        }
      }
    }
  
    // Set the flag to prevent the implementation from emitting device exception
    // handling code for those requiring so.
    if ((Opts.OpenMPIsDevice && T.isNVPTX()) || Opts.OpenCLCPlusPlus) {
      Opts.Exceptions = 0;
      Opts.CXXExceptions = 0;
    }
    if (Opts.OpenMPIsDevice && T.isNVPTX()) {
      Opts.OpenMPCUDANumSMs =
          getLastArgIntValue(Args, options::OPT_fopenmp_cuda_number_of_sm_EQ,
                             Opts.OpenMPCUDANumSMs, Diags);
      Opts.OpenMPCUDABlocksPerSM =
          getLastArgIntValue(Args, options::OPT_fopenmp_cuda_blocks_per_sm_EQ,
                             Opts.OpenMPCUDABlocksPerSM, Diags);
      Opts.OpenMPCUDAReductionBufNum = getLastArgIntValue(
          Args, options::OPT_fopenmp_cuda_teams_reduction_recs_num_EQ,
          Opts.OpenMPCUDAReductionBufNum, Diags);
    }
  
    // Prevent auto-widening the representation of loop counters during an
    // OpenMP collapse clause.
    Opts.OpenMPOptimisticCollapse =
        Args.hasArg(options::OPT_fopenmp_optimistic_collapse) ? 1 : 0;
  
    // Get the OpenMP target triples if any.
    if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
  
      for (unsigned i = 0; i < A->getNumValues(); ++i) {
        llvm::Triple TT(A->getValue(i));
  
        if (TT.getArch() == llvm::Triple::UnknownArch ||
            !(TT.getArch() == llvm::Triple::ppc ||
              TT.getArch() == llvm::Triple::ppc64 ||
              TT.getArch() == llvm::Triple::ppc64le ||
              TT.getArch() == llvm::Triple::nvptx ||
              TT.getArch() == llvm::Triple::nvptx64 ||
              TT.getArch() == llvm::Triple::x86 ||
              TT.getArch() == llvm::Triple::x86_64))
          Diags.Report(diag::err_drv_invalid_omp_target) << A->getValue(i);
        else
          Opts.OMPTargetTriples.push_back(TT);
      }
    }
  
    // Get OpenMP host file path if any and report if a non existent file is
    // found
    if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
      Opts.OMPHostIRFile = A->getValue();
      if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
        Diags.Report(diag::err_drv_omp_host_ir_file_not_found)
            << Opts.OMPHostIRFile;
    }
  
    Opts.SYCLIsDevice = Args.hasArg(options::OPT_fsycl_is_device);
  
    // Set CUDA mode for OpenMP target NVPTX if specified in options
    Opts.OpenMPCUDAMode = Opts.OpenMPIsDevice && T.isNVPTX() &&
                          Args.hasArg(options::OPT_fopenmp_cuda_mode);
  
    // Set CUDA mode for OpenMP target NVPTX if specified in options
    Opts.OpenMPCUDAForceFullRuntime =
        Opts.OpenMPIsDevice && T.isNVPTX() &&
        Args.hasArg(options::OPT_fopenmp_cuda_force_full_runtime);
  
    // Record whether the __DEPRECATED define was requested.
    Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
                                   OPT_fno_deprecated_macro,
                                   Opts.Deprecated);
  
    // FIXME: Eliminate this dependency.
    unsigned Opt = getOptimizationLevel(Args, IK, Diags),
         OptSize = getOptimizationLevelSize(Args);
    Opts.Optimize = Opt != 0;
    Opts.OptimizeSize = OptSize != 0;
  
    // This is the __NO_INLINE__ define, which just depends on things like the
    // optimization level and -fno-inline, not actually whether the backend has
    // inlining enabled.
    Opts.NoInlineDefine = !Opts.Optimize;
    if (Arg *InlineArg = Args.getLastArg(
            options::OPT_finline_functions, options::OPT_finline_hint_functions,
            options::OPT_fno_inline_functions, options::OPT_fno_inline))
      if (InlineArg->getOption().matches(options::OPT_fno_inline))
        Opts.NoInlineDefine = true;
  
    Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
        Args.hasArg(OPT_cl_fast_relaxed_math);
    Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
        Args.hasArg(OPT_cl_finite_math_only) ||
        Args.hasArg(OPT_cl_fast_relaxed_math);
    Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
                        Args.hasArg(OPT_cl_fast_relaxed_math);
  
    if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
      StringRef Val = A->getValue();
      if (Val == "fast")
        Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
      else if (Val == "on")
        Opts.setDefaultFPContractMode(LangOptions::FPC_On);
      else if (Val == "off")
        Opts.setDefaultFPContractMode(LangOptions::FPC_Off);
      else
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
    }
  
    Opts.RetainCommentsFromSystemHeaders =
        Args.hasArg(OPT_fretain_comments_from_system_headers);
  
    unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
    switch (SSP) {
    default:
      Diags.Report(diag::err_drv_invalid_value)
        << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
      break;
    case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
    case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
    case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
    case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
    }
  
    if (Arg *A = Args.getLastArg(OPT_ftrivial_auto_var_init)) {
      StringRef Val = A->getValue();
      if (Val == "uninitialized")
        Opts.setTrivialAutoVarInit(
            LangOptions::TrivialAutoVarInitKind::Uninitialized);
      else if (Val == "zero")
        Opts.setTrivialAutoVarInit(LangOptions::TrivialAutoVarInitKind::Zero);
      else if (Val == "pattern")
        Opts.setTrivialAutoVarInit(LangOptions::TrivialAutoVarInitKind::Pattern);
      else
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
    }
  
    // Parse -fsanitize= arguments.
    parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
                        Diags, Opts.Sanitize);
    // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
    Opts.SanitizeAddressFieldPadding =
        getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
    Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
  
    // -fxray-instrument
    Opts.XRayInstrument =
        Args.hasFlag(OPT_fxray_instrument, OPT_fnoxray_instrument, false);
  
    // -fxray-always-emit-customevents
    Opts.XRayAlwaysEmitCustomEvents =
        Args.hasFlag(OPT_fxray_always_emit_customevents,
                     OPT_fnoxray_always_emit_customevents, false);
  
    // -fxray-always-emit-typedevents
    Opts.XRayAlwaysEmitTypedEvents =
        Args.hasFlag(OPT_fxray_always_emit_typedevents,
                     OPT_fnoxray_always_emit_customevents, false);
  
    // -fxray-{always,never}-instrument= filenames.
    Opts.XRayAlwaysInstrumentFiles =
        Args.getAllArgValues(OPT_fxray_always_instrument);
    Opts.XRayNeverInstrumentFiles =
        Args.getAllArgValues(OPT_fxray_never_instrument);
    Opts.XRayAttrListFiles = Args.getAllArgValues(OPT_fxray_attr_list);
  
    // -fforce-emit-vtables
    Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
  
    // -fallow-editor-placeholders
    Opts.AllowEditorPlaceholders = Args.hasArg(OPT_fallow_editor_placeholders);
  
    Opts.RegisterStaticDestructors = !Args.hasArg(OPT_fno_cxx_static_destructors);
  
    if (Arg *A = Args.getLastArg(OPT_fclang_abi_compat_EQ)) {
      Opts.setClangABICompat(LangOptions::ClangABI::Latest);
  
      StringRef Ver = A->getValue();
      std::pair<StringRef, StringRef> VerParts = Ver.split('.');
      unsigned Major, Minor = 0;
  
      // Check the version number is valid: either 3.x (0 <= x <= 9) or
      // y or y.0 (4 <= y <= current version).
      if (!VerParts.first.startswith("0") &&
          !VerParts.first.getAsInteger(10, Major) &&
          3 <= Major && Major <= CLANG_VERSION_MAJOR &&
          (Major == 3 ? VerParts.second.size() == 1 &&
                        !VerParts.second.getAsInteger(10, Minor)
                      : VerParts.first.size() == Ver.size() ||
                        VerParts.second == "0")) {
        // Got a valid version number.
        if (Major == 3 && Minor <= 8)
          Opts.setClangABICompat(LangOptions::ClangABI::Ver3_8);
        else if (Major <= 4)
          Opts.setClangABICompat(LangOptions::ClangABI::Ver4);
        else if (Major <= 6)
          Opts.setClangABICompat(LangOptions::ClangABI::Ver6);
        else if (Major <= 7)
          Opts.setClangABICompat(LangOptions::ClangABI::Ver7);
      } else if (Ver != "latest") {
        Diags.Report(diag::err_drv_invalid_value)
            << A->getAsString(Args) << A->getValue();
      }
    }
  
    Opts.CompleteMemberPointers = Args.hasArg(OPT_fcomplete_member_pointers);
    Opts.BuildingPCHWithObjectFile = Args.hasArg(OPT_building_pch_with_obj);
  }
  
  static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
    switch (Action) {
    case frontend::ASTDeclList:
    case frontend::ASTDump:
    case frontend::ASTPrint:
    case frontend::ASTView:
    case frontend::EmitAssembly:
    case frontend::EmitBC:
    case frontend::EmitHTML:
    case frontend::EmitLLVM:
    case frontend::EmitLLVMOnly:
    case frontend::EmitCodeGenOnly:
    case frontend::EmitObj:
    case frontend::FixIt:
    case frontend::GenerateModule:
    case frontend::GenerateModuleInterface:
    case frontend::GenerateHeaderModule:
    case frontend::GeneratePCH:
    case frontend::GenerateInterfaceYAMLExpV1:
    case frontend::GenerateInterfaceTBEExpV1:
    case frontend::ParseSyntaxOnly:
    case frontend::ModuleFileInfo:
    case frontend::VerifyPCH:
    case frontend::PluginAction:
    case frontend::RewriteObjC:
    case frontend::RewriteTest:
    case frontend::RunAnalysis:
    case frontend::TemplightDump:
    case frontend::MigrateSource:
      return false;
  
    case frontend::DumpCompilerOptions:
    case frontend::DumpRawTokens:
    case frontend::DumpTokens:
    case frontend::InitOnly:
    case frontend::PrintPreamble:
    case frontend::PrintPreprocessedInput:
    case frontend::RewriteMacros:
    case frontend::RunPreprocessorOnly:
    case frontend::PrintDependencyDirectivesSourceMinimizerOutput:
      return true;
    }
    llvm_unreachable("invalid frontend action");
  }
  
  static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
                                    DiagnosticsEngine &Diags,
                                    frontend::ActionKind Action) {
    Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
    Opts.PCHWithHdrStop = Args.hasArg(OPT_pch_through_hdrstop_create) ||
                          Args.hasArg(OPT_pch_through_hdrstop_use);
    Opts.PCHWithHdrStopCreate = Args.hasArg(OPT_pch_through_hdrstop_create);
    Opts.PCHThroughHeader = Args.getLastArgValue(OPT_pch_through_header_EQ);
    Opts.UsePredefines = !Args.hasArg(OPT_undef);
    Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
    Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
    Opts.AllowPCHWithCompilerErrors = Args.hasArg(OPT_fallow_pch_with_errors);
  
    Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
    for (const auto *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
      Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
  
    if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
      StringRef Value(A->getValue());
      size_t Comma = Value.find(',');
      unsigned Bytes = 0;
      unsigned EndOfLine = 0;
  
      if (Comma == StringRef::npos ||
          Value.substr(0, Comma).getAsInteger(10, Bytes) ||
          Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
        Diags.Report(diag::err_drv_preamble_format);
      else {
        Opts.PrecompiledPreambleBytes.first = Bytes;
        Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
      }
    }
  
    // Add the __CET__ macro if a CFProtection option is set.
    if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
      StringRef Name = A->getValue();
      if (Name == "branch")
        Opts.addMacroDef("__CET__=1");
      else if (Name == "return")
        Opts.addMacroDef("__CET__=2");
      else if (Name == "full")
        Opts.addMacroDef("__CET__=3");
    }
  
    // Add macros from the command line.
    for (const auto *A : Args.filtered(OPT_D, OPT_U)) {
      if (A->getOption().matches(OPT_D))
        Opts.addMacroDef(A->getValue());
      else
        Opts.addMacroUndef(A->getValue());
    }
  
    Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
  
    // Add the ordered list of -includes.
    for (const auto *A : Args.filtered(OPT_include))
      Opts.Includes.emplace_back(A->getValue());
  
    for (const auto *A : Args.filtered(OPT_chain_include))
      Opts.ChainedIncludes.emplace_back(A->getValue());
  
    for (const auto *A : Args.filtered(OPT_remap_file)) {
      std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
  
      if (Split.second.empty()) {
        Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
        continue;
      }
  
      Opts.addRemappedFile(Split.first, Split.second);
    }
  
    if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
      StringRef Name = A->getValue();
      unsigned Library = llvm::StringSwitch<unsigned>(Name)
        .Case("libc++", ARCXX_libcxx)
        .Case("libstdc++", ARCXX_libstdcxx)
        .Case("none", ARCXX_nolib)
        .Default(~0U);
      if (Library == ~0U)
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
      else
        Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
    }
  
    // Always avoid lexing editor placeholders when we're just running the
    // preprocessor as we never want to emit the
    // "editor placeholder in source file" error in PP only mode.
    if (isStrictlyPreprocessorAction(Action))
      Opts.LexEditorPlaceholders = false;
  }
  
  static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
                                          ArgList &Args,
                                          frontend::ActionKind Action) {
    if (isStrictlyPreprocessorAction(Action))
      Opts.ShowCPP = !Args.hasArg(OPT_dM);
    else
      Opts.ShowCPP = 0;
  
    Opts.ShowComments = Args.hasArg(OPT_C);
    Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
    Opts.ShowMacroComments = Args.hasArg(OPT_CC);
    Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
    Opts.ShowIncludeDirectives = Args.hasArg(OPT_dI);
    Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
    Opts.RewriteImports = Args.hasArg(OPT_frewrite_imports);
    Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
  }
  
  static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
                              DiagnosticsEngine &Diags) {
    Opts.CodeModel = getCodeModel(Args, Diags);
    Opts.ABI = Args.getLastArgValue(OPT_target_abi);
    if (Arg *A = Args.getLastArg(OPT_meabi)) {
      StringRef Value = A->getValue();
      llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
                                   .Case("default", llvm::EABI::Default)
                                   .Case("4", llvm::EABI::EABI4)
                                   .Case("5", llvm::EABI::EABI5)
                                   .Case("gnu", llvm::EABI::GNU)
                                   .Default(llvm::EABI::Unknown);
      if (EABIVersion == llvm::EABI::Unknown)
        Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
                                                  << Value;
      else
        Opts.EABIVersion = EABIVersion;
    }
    Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
    Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
    Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
    Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
    Opts.Triple = Args.getLastArgValue(OPT_triple);
    // Use the default target triple if unspecified.
    if (Opts.Triple.empty())
      Opts.Triple = llvm::sys::getDefaultTargetTriple();
    Opts.Triple = llvm::Triple::normalize(Opts.Triple);
    Opts.OpenCLExtensionsAsWritten = Args.getAllArgValues(OPT_cl_ext_EQ);
    Opts.ForceEnableInt128 = Args.hasArg(OPT_fforce_enable_int128);
    Opts.NVPTXUseShortPointers = Args.hasFlag(
        options::OPT_fcuda_short_ptr, options::OPT_fno_cuda_short_ptr, false);
    if (Arg *A = Args.getLastArg(options::OPT_target_sdk_version_EQ)) {
      llvm::VersionTuple Version;
      if (Version.tryParse(A->getValue()))
        Diags.Report(diag::err_drv_invalid_value)
            << A->getAsString(Args) << A->getValue();
      else
        Opts.SDKVersion = Version;
    }
  }
  
  bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
                                          const char *const *ArgBegin,
                                          const char *const *ArgEnd,
                                          DiagnosticsEngine &Diags) {
    bool Success = true;
  
    // Parse the arguments.
    std::unique_ptr<OptTable> Opts = createDriverOptTable();
    const unsigned IncludedFlagsBitmask = options::CC1Option;
    unsigned MissingArgIndex, MissingArgCount;
    InputArgList Args =
        Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
                        MissingArgCount, IncludedFlagsBitmask);
    LangOptions &LangOpts = *Res.getLangOpts();
  
    // Check for missing argument error.
    if (MissingArgCount) {
      Diags.Report(diag::err_drv_missing_argument)
          << Args.getArgString(MissingArgIndex) << MissingArgCount;
      Success = false;
    }
  
    // Issue errors on unknown arguments.
    for (const auto *A : Args.filtered(OPT_UNKNOWN)) {
      auto ArgString = A->getAsString(Args);
      std::string Nearest;
      if (Opts->findNearest(ArgString, Nearest, IncludedFlagsBitmask) > 1)
        Diags.Report(diag::err_drv_unknown_argument) << ArgString;
      else
        Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
            << ArgString << Nearest;
      Success = false;
    }
  
    Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
    Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
    ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
    Success &=
        ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
                            false /*DefaultDiagColor*/, false /*DefaultShowOpt*/);
    ParseCommentArgs(LangOpts.CommentOpts, Args);
    ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
    // FIXME: We shouldn't have to pass the DashX option around here
    InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
                                        LangOpts.IsHeaderFile);
    ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
    Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
                                Res.getTargetOpts(), Res.getFrontendOpts());
    ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
                          Res.getFileSystemOpts().WorkingDir);
    llvm::Triple T(Res.getTargetOpts().Triple);
    if (DashX.getFormat() == InputKind::Precompiled ||
        DashX.getLanguage() == InputKind::LLVM_IR) {
      // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
      // PassManager in BackendUtil.cpp. They need to be initializd no matter
      // what the input type is.
      if (Args.hasArg(OPT_fobjc_arc))
        LangOpts.ObjCAutoRefCount = 1;
      // PIClevel and PIELevel are needed during code generation and this should be
      // set regardless of the input type.
      LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
      LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
      parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
                          Diags, LangOpts.Sanitize);
    } else {
      // Other LangOpts are only initialized when the input is not AST or LLVM IR.
      // FIXME: Should we really be calling this for an InputKind::Asm input?
      ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
                    Res.getPreprocessorOpts(), Diags);
      if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
        LangOpts.ObjCExceptions = 1;
      if (T.isOSDarwin() && DashX.isPreprocessed()) {
        // Supress the darwin-specific 'stdlibcxx-not-found' diagnostic for
        // preprocessed input as we don't expect it to be used with -std=libc++
        // anyway.
        Res.getDiagnosticOpts().Warnings.push_back("no-stdlibcxx-not-found");
      }
    }
  
    LangOpts.FunctionAlignment =
        getLastArgIntValue(Args, OPT_function_alignment, 0, Diags);
  
    if (LangOpts.CUDA) {
      // During CUDA device-side compilation, the aux triple is the
      // triple used for host compilation.
      if (LangOpts.CUDAIsDevice)
        Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
    }
  
    // Set the triple of the host for OpenMP device compile.
    if (LangOpts.OpenMPIsDevice)
      Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
  
    // FIXME: Override value name discarding when asan or msan is used because the
    // backend passes depend on the name of the alloca in order to print out
    // names.
    Res.getCodeGenOpts().DiscardValueNames &=
        !LangOpts.Sanitize.has(SanitizerKind::Address) &&
        !LangOpts.Sanitize.has(SanitizerKind::KernelAddress) &&
        !LangOpts.Sanitize.has(SanitizerKind::Memory) &&
        !LangOpts.Sanitize.has(SanitizerKind::KernelMemory);
  
    ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, Diags,
                          Res.getFrontendOpts().ProgramAction);
    ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
                                Res.getFrontendOpts().ProgramAction);
  
    // Turn on -Wspir-compat for SPIR target.
    if (T.isSPIR())
      Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
  
    // If sanitizer is enabled, disable OPT_ffine_grained_bitfield_accesses.
    if (Res.getCodeGenOpts().FineGrainedBitfieldAccesses &&
        !Res.getLangOpts()->Sanitize.empty()) {
      Res.getCodeGenOpts().FineGrainedBitfieldAccesses = false;
      Diags.Report(diag::warn_drv_fine_grained_bitfield_accesses_ignored);
    }
    return Success;
  }
  
  std::string CompilerInvocation::getModuleHash() const {
    // Note: For QoI reasons, the things we use as a hash here should all be
    // dumped via the -module-info flag.
    using llvm::hash_code;
    using llvm::hash_value;
    using llvm::hash_combine;
  
    // Start the signature with the compiler version.
    // FIXME: We'd rather use something more cryptographically sound than
    // CityHash, but this will do for now.
    hash_code code = hash_value(getClangFullRepositoryVersion());
  
    // Extend the signature with the language options
  #define LANGOPT(Name, Bits, Default, Description) \
     code = hash_combine(code, LangOpts->Name);
  #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
    code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
  #define BENIGN_LANGOPT(Name, Bits, Default, Description)
  #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
  #include "clang/Basic/LangOptions.def"
  
    for (StringRef Feature : LangOpts->ModuleFeatures)
      code = hash_combine(code, Feature);
  
    // Extend the signature with the target options.
    code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
                        TargetOpts->ABI);
    for (const auto &FeatureAsWritten : TargetOpts->FeaturesAsWritten)
      code = hash_combine(code, FeatureAsWritten);
  
    // Extend the signature with preprocessor options.
    const PreprocessorOptions &ppOpts = getPreprocessorOpts();
    const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
    code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
  
    for (const auto &I : getPreprocessorOpts().Macros) {
      // If we're supposed to ignore this macro for the purposes of modules,
      // don't put it into the hash.
      if (!hsOpts.ModulesIgnoreMacros.empty()) {
        // Check whether we're ignoring this macro.
        StringRef MacroDef = I.first;
        if (hsOpts.ModulesIgnoreMacros.count(
                llvm::CachedHashString(MacroDef.split('=').first)))
          continue;
      }
  
      code = hash_combine(code, I.first, I.second);
    }
  
    // Extend the signature with the sysroot and other header search options.
    code = hash_combine(code, hsOpts.Sysroot,
                        hsOpts.ModuleFormat,
                        hsOpts.UseDebugInfo,
                        hsOpts.UseBuiltinIncludes,
                        hsOpts.UseStandardSystemIncludes,
                        hsOpts.UseStandardCXXIncludes,
                        hsOpts.UseLibcxx,
                        hsOpts.ModulesValidateDiagnosticOptions);
    code = hash_combine(code, hsOpts.ResourceDir);
  
    // Extend the signature with the user build path.
    code = hash_combine(code, hsOpts.ModuleUserBuildPath);
  
    // Extend the signature with the module file extensions.
    const FrontendOptions &frontendOpts = getFrontendOpts();
    for (const auto &ext : frontendOpts.ModuleFileExtensions) {
      code = ext->hashExtension(code);
    }
  
    // When compiling with -gmodules, also hash -fdebug-prefix-map as it
    // affects the debug info in the PCM.
    if (getCodeGenOpts().DebugTypeExtRefs)
      for (const auto &KeyValue : getCodeGenOpts().DebugPrefixMap)
        code = hash_combine(code, KeyValue.first, KeyValue.second);
  
    // Extend the signature with the enabled sanitizers, if at least one is
    // enabled. Sanitizers which cannot affect AST generation aren't hashed.
    SanitizerSet SanHash = LangOpts->Sanitize;
    SanHash.clear(getPPTransparentSanitizers());
    if (!SanHash.empty())
      code = hash_combine(code, SanHash.Mask);
  
    return llvm::APInt(64, code).toString(36, /*Signed=*/false);
  }
  
  template<typename IntTy>
  static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
                                      IntTy Default,
                                      DiagnosticsEngine *Diags) {
    IntTy Res = Default;
    if (Arg *A = Args.getLastArg(Id)) {
      if (StringRef(A->getValue()).getAsInteger(10, Res)) {
        if (Diags)
          Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
                                                         << A->getValue();
      }
    }
    return Res;
  }
  
  namespace clang {
  
  // Declared in clang/Frontend/Utils.h.
  int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
                         DiagnosticsEngine *Diags) {
    return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
  }
  
  uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
                                 uint64_t Default,
                                 DiagnosticsEngine *Diags) {
    return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
  }
  
  IntrusiveRefCntPtr<llvm::vfs::FileSystem>
  createVFSFromCompilerInvocation(const CompilerInvocation &CI,
                                  DiagnosticsEngine &Diags) {
    return createVFSFromCompilerInvocation(CI, Diags,
                                           llvm::vfs::getRealFileSystem());
  }
  
  IntrusiveRefCntPtr<llvm::vfs::FileSystem> createVFSFromCompilerInvocation(
      const CompilerInvocation &CI, DiagnosticsEngine &Diags,
      IntrusiveRefCntPtr<llvm::vfs::FileSystem> BaseFS) {
    if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
      return BaseFS;
  
    IntrusiveRefCntPtr<llvm::vfs::FileSystem> Result = BaseFS;
    // earlier vfs files are on the bottom
    for (const auto &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
      llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
          Result->getBufferForFile(File);
      if (!Buffer) {
        Diags.Report(diag::err_missing_vfs_overlay_file) << File;
        continue;
      }
  
      IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS = llvm::vfs::getVFSFromYAML(
          std::move(Buffer.get()), /*DiagHandler*/ nullptr, File,
          /*DiagContext*/ nullptr, Result);
      if (!FS) {
        Diags.Report(diag::err_invalid_vfs_overlay) << File;
        continue;
      }
  
      Result = FS;
    }
    return Result;
  }
  
  } // namespace clang
  