diff --git a/clang/include/clang/Frontend/CompilerInvocation.h b/clang/include/clang/Frontend/CompilerInvocation.h
index f0280232af0d..f3253d5b40e3 100644
--- a/clang/include/clang/Frontend/CompilerInvocation.h
+++ b/clang/include/clang/Frontend/CompilerInvocation.h
@@ -1,240 +1,237 @@
 //===- CompilerInvocation.h - Compiler Invocation Helper Data ---*- C++ -*-===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_FRONTEND_COMPILERINVOCATION_H
 #define LLVM_CLANG_FRONTEND_COMPILERINVOCATION_H
 
 #include "clang/Basic/CodeGenOptions.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Basic/FileSystemOptions.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/LangStandard.h"
 #include "clang/Frontend/DependencyOutputOptions.h"
 #include "clang/Frontend/FrontendOptions.h"
 #include "clang/Frontend/MigratorOptions.h"
 #include "clang/Frontend/PreprocessorOutputOptions.h"
 #include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/ArrayRef.h"
 #include <memory>
 #include <string>
 
 namespace llvm {
 
 class Triple;
 
 namespace opt {
 
 class ArgList;
 
 } // namespace opt
 
 namespace vfs {
 
 class FileSystem;
 
 } // namespace vfs
 
 } // namespace llvm
 
 namespace clang {
 
 class DiagnosticsEngine;
 class HeaderSearchOptions;
 class PreprocessorOptions;
 class TargetOptions;
 
 /// Fill out Opts based on the options given in Args.
 ///
 /// Args must have been created from the OptTable returned by
 /// createCC1OptTable().
 ///
 /// When errors are encountered, return false and, if Diags is non-null,
 /// report the error(s).
 bool ParseDiagnosticArgs(DiagnosticOptions &Opts, llvm::opt::ArgList &Args,
                          DiagnosticsEngine *Diags = nullptr,
                          bool DefaultDiagColor = true,
                          bool DefaultShowOpt = true);
 
 class CompilerInvocationBase {
 public:
   /// Options controlling the language variant.
   std::shared_ptr<LangOptions> LangOpts;
 
   /// Options controlling the target.
   std::shared_ptr<TargetOptions> TargetOpts;
 
   /// Options controlling the diagnostic engine.
   IntrusiveRefCntPtr<DiagnosticOptions> DiagnosticOpts;
 
   /// Options controlling the \#include directive.
   std::shared_ptr<HeaderSearchOptions> HeaderSearchOpts;
 
   /// Options controlling the preprocessor (aside from \#include handling).
   std::shared_ptr<PreprocessorOptions> PreprocessorOpts;
 
   CompilerInvocationBase();
   CompilerInvocationBase(const CompilerInvocationBase &X);
   CompilerInvocationBase &operator=(const CompilerInvocationBase &) = delete;
   ~CompilerInvocationBase();
 
   LangOptions *getLangOpts() { return LangOpts.get(); }
   const LangOptions *getLangOpts() const { return LangOpts.get(); }
 
   TargetOptions &getTargetOpts() { return *TargetOpts.get(); }
   const TargetOptions &getTargetOpts() const { return *TargetOpts.get(); }
 
   DiagnosticOptions &getDiagnosticOpts() const { return *DiagnosticOpts; }
 
   HeaderSearchOptions &getHeaderSearchOpts() { return *HeaderSearchOpts; }
 
   const HeaderSearchOptions &getHeaderSearchOpts() const {
     return *HeaderSearchOpts;
   }
 
   std::shared_ptr<HeaderSearchOptions> getHeaderSearchOptsPtr() const {
     return HeaderSearchOpts;
   }
 
   std::shared_ptr<PreprocessorOptions> getPreprocessorOptsPtr() {
     return PreprocessorOpts;
   }
 
   PreprocessorOptions &getPreprocessorOpts() { return *PreprocessorOpts; }
 
   const PreprocessorOptions &getPreprocessorOpts() const {
     return *PreprocessorOpts;
   }
 };
 
 /// Helper class for holding the data necessary to invoke the compiler.
 ///
 /// This class is designed to represent an abstract "invocation" of the
 /// compiler, including data such as the include paths, the code generation
 /// options, the warning flags, and so on.
 class CompilerInvocation : public CompilerInvocationBase {
   /// Options controlling the static analyzer.
   AnalyzerOptionsRef AnalyzerOpts;
 
   MigratorOptions MigratorOpts;
 
   /// Options controlling IRgen and the backend.
   CodeGenOptions CodeGenOpts;
 
   /// Options controlling dependency output.
   DependencyOutputOptions DependencyOutputOpts;
 
   /// Options controlling file system operations.
   FileSystemOptions FileSystemOpts;
 
   /// Options controlling the frontend itself.
   FrontendOptions FrontendOpts;
 
   /// Options controlling preprocessed output.
   PreprocessorOutputOptions PreprocessorOutputOpts;
 
 public:
   CompilerInvocation() : AnalyzerOpts(new AnalyzerOptions()) {}
 
   /// @name Utility Methods
   /// @{
 
   /// Create a compiler invocation from a list of input options.
   /// \returns true on success.
   ///
   /// \returns false if an error was encountered while parsing the arguments
   /// and attempts to recover and continue parsing the rest of the arguments.
   /// The recovery is best-effort and only guarantees that \p Res will end up in
   /// one of the vaild-to-access (albeit arbitrary) states.
   ///
   /// \param [out] Res - The resulting invocation.
-  /// \param ArgBegin - The first element in the argument vector.
-  /// \param ArgEnd - The last element in the argument vector.
-  /// \param Diags - The diagnostic engine to use for errors.
   static bool CreateFromArgs(CompilerInvocation &Res,
-                             const char* const *ArgBegin,
-                             const char* const *ArgEnd,
+                             ArrayRef<const char *> CommandLineArgs,
                              DiagnosticsEngine &Diags);
 
   /// Get the directory where the compiler headers
   /// reside, relative to the compiler binary (found by the passed in
   /// arguments).
   ///
   /// \param Argv0 - The program path (from argv[0]), for finding the builtin
   /// compiler path.
   /// \param MainAddr - The address of main (or some other function in the main
   /// executable), for finding the builtin compiler path.
   static std::string GetResourcesPath(const char *Argv0, void *MainAddr);
 
   /// Set language defaults for the given input language and
   /// language standard in the given LangOptions object.
   ///
   /// \param Opts - The LangOptions object to set up.
   /// \param IK - The input language.
   /// \param T - The target triple.
   /// \param PPOpts - The PreprocessorOptions affected.
   /// \param LangStd - The input language standard.
   static void setLangDefaults(LangOptions &Opts, InputKind IK,
                    const llvm::Triple &T, PreprocessorOptions &PPOpts,
                    LangStandard::Kind LangStd = LangStandard::lang_unspecified);
 
   /// Retrieve a module hash string that is suitable for uniquely
   /// identifying the conditions under which the module was built.
   std::string getModuleHash() const;
 
   /// @}
   /// @name Option Subgroups
   /// @{
 
   AnalyzerOptionsRef getAnalyzerOpts() const { return AnalyzerOpts; }
 
   MigratorOptions &getMigratorOpts() { return MigratorOpts; }
   const MigratorOptions &getMigratorOpts() const { return MigratorOpts; }
 
   CodeGenOptions &getCodeGenOpts() { return CodeGenOpts; }
   const CodeGenOptions &getCodeGenOpts() const { return CodeGenOpts; }
 
   DependencyOutputOptions &getDependencyOutputOpts() {
     return DependencyOutputOpts;
   }
 
   const DependencyOutputOptions &getDependencyOutputOpts() const {
     return DependencyOutputOpts;
   }
 
   FileSystemOptions &getFileSystemOpts() { return FileSystemOpts; }
 
   const FileSystemOptions &getFileSystemOpts() const {
     return FileSystemOpts;
   }
 
   FrontendOptions &getFrontendOpts() { return FrontendOpts; }
   const FrontendOptions &getFrontendOpts() const { return FrontendOpts; }
 
   PreprocessorOutputOptions &getPreprocessorOutputOpts() {
     return PreprocessorOutputOpts;
   }
 
   const PreprocessorOutputOptions &getPreprocessorOutputOpts() const {
     return PreprocessorOutputOpts;
   }
 
   /// @}
 };
 
 IntrusiveRefCntPtr<llvm::vfs::FileSystem>
 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
                                 DiagnosticsEngine &Diags);
 
 IntrusiveRefCntPtr<llvm::vfs::FileSystem> createVFSFromCompilerInvocation(
     const CompilerInvocation &CI, DiagnosticsEngine &Diags,
     IntrusiveRefCntPtr<llvm::vfs::FileSystem> BaseFS);
 
 } // namespace clang
 
 #endif // LLVM_CLANG_FRONTEND_COMPILERINVOCATION_H
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 0e222b95dde6..86c66f3a07a5 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1,3642 +1,3640 @@
 //===- 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/LangStandard.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/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() == Language::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.CheckersAndPackages.clear();
   for (const Arg *A :
        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
     A->claim();
     bool IsEnabled = A->getOption().getID() == OPT_analyzer_checker;
     // We can have a list of comma separated checker names, e.g:
     // '-analyzer-checker=cocoa,unix'
     StringRef CheckerAndPackageList = A->getValue();
     SmallVector<StringRef, 16> CheckersAndPackages;
     CheckerAndPackageList.split(CheckersAndPackages, ",");
     for (const StringRef CheckerOrPackage : CheckersAndPackages)
       Opts.CheckersAndPackages.emplace_back(CheckerOrPackage, IsEnabled);
   }
 
   // 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.
 
   // FIXME: Here we try to validate the silenced checkers or packages are valid.
   // The current approach only validates the registered checkers which does not
   // contain the runtime enabled checkers and optimally we would validate both.
   if (!AnOpts.RawSilencedCheckersAndPackages.empty()) {
     std::vector<StringRef> Checkers =
         AnOpts.getRegisteredCheckers(/*IncludeExperimental=*/true);
     std::vector<StringRef> Packages =
         AnOpts.getRegisteredPackages(/*IncludeExperimental=*/true);
 
     SmallVector<StringRef, 16> CheckersAndPackages;
     AnOpts.RawSilencedCheckersAndPackages.split(CheckersAndPackages, ";");
 
     for (const StringRef CheckerOrPackage : CheckersAndPackages) {
       if (Diags) {
         bool IsChecker = CheckerOrPackage.contains('.');
         bool IsValidName =
             IsChecker
                 ? llvm::find(Checkers, CheckerOrPackage) != Checkers.end()
                 : llvm::find(Packages, CheckerOrPackage) != Packages.end();
 
         if (!IsValidName)
           Diags->Report(diag::err_unknown_analyzer_checker_or_package)
               << CheckerOrPackage;
       }
 
       AnOpts.SilencedCheckersAndPackages.emplace_back(CheckerOrPackage);
     }
   }
 
   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);
 
   // Handle -mframe-pointer option.
   if (Arg *A = Args.getLastArg(OPT_mframe_pointer_EQ)) {
     CodeGenOptions::FramePointerKind FP;
     StringRef Name = A->getValue();
     bool ValidFP = true;
     if (Name == "none")
       FP = CodeGenOptions::FramePointerKind::None;
     else if (Name == "non-leaf")
       FP = CodeGenOptions::FramePointerKind::NonLeaf;
     else if (Name == "all")
       FP = CodeGenOptions::FramePointerKind::All;
     else {
       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
       Success = false;
       ValidFP = false;
     }
     if (ValidFP)
       Opts.setFramePointer(FP);
   }
 
   // -pg may override -mframe-pointer
   // TODO: This should be merged into getFramePointerKind in Clang.cpp.
   if (Args.hasArg(OPT_pg))
     Opts.setFramePointer(CodeGenOptions::FramePointerKind::All);
 
   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.NoWarn = Args.hasArg(OPT_massembler_no_warn);
   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.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() != Language::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.SanitizeCfiCanonicalJumpTables =
       Args.hasArg(OPT_fsanitize_cfi_canonical_jump_tables);
   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() != Language::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);
 
   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: {
       StringRef ArgStr =
           Args.hasArg(OPT_iterface_stub_version_EQ)
               ? Args.getLastArgValue(OPT_iterface_stub_version_EQ)
               : "";
       llvm::Optional<frontend::ActionKind> ProgramAction =
           llvm::StringSwitch<llvm::Optional<frontend::ActionKind>>(ArgStr)
               .Case("experimental-ifs-v1", frontend::GenerateInterfaceIfsExpV1)
               .Default(llvm::None);
       if (!ProgramAction) {
         std::string ErrorMessage =
             "Invalid interface stub format: " + ArgStr.str() +
             ((ArgStr == "experimental-yaml-elf-v1" ||
               ArgStr == "experimental-tapi-elf-v1")
                  ? " is deprecated."
                  : ".");
         Diags.Report(diag::err_drv_invalid_value)
             << "Must specify a valid interface stub format type, ie: "
                "-interface-stub-version=experimental-ifs-v1"
             << ErrorMessage;
       } else {
         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.TimeTraceGranularity = getLastArgIntValue(
       Args, OPT_ftime_trace_granularity_EQ, Opts.TimeTraceGranularity, Diags);
   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(Language::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", Language::C)
                 .Case("cl", Language::OpenCL)
                 .Case("cuda", Language::CUDA)
                 .Case("hip", Language::HIP)
                 .Case("c++", Language::CXX)
                 .Case("objective-c", Language::ObjC)
                 .Case("objective-c++", Language::ObjCXX)
                 .Case("renderscript", Language::RenderScript)
                 .Default(Language::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", Language::ObjC)
                   .Case("objc++", Language::ObjCXX)
                   .Default(Language::Unknown);
 
     // Some special cases cannot be combined with suffixes.
     if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
       DashX = llvm::StringSwitch<InputKind>(XValue)
                   .Case("cpp-output", InputKind(Language::C).getPreprocessed())
                   .Case("assembler-with-cpp", Language::Asm)
                   .Cases("ast", "pcm",
                          InputKind(Language::Unknown, InputKind::Precompiled))
                   .Case("ir", Language::LLVM_IR)
                   .Default(Language::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 = Language::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() == Language::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 Language::Unknown:
     case Language::LLVM_IR:
       llvm_unreachable("Invalid input kind!");
     case Language::OpenCL:
       LangStd = LangStandard::lang_opencl10;
       break;
     case Language::CUDA:
       LangStd = LangStandard::lang_cuda;
       break;
     case Language::Asm:
     case Language::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 Language::ObjC:
 #if defined(CLANG_DEFAULT_STD_C)
       LangStd = CLANG_DEFAULT_STD_C;
 #else
       LangStd = LangStandard::lang_gnu11;
 #endif
       break;
     case Language::CXX:
     case Language::ObjCXX:
 #if defined(CLANG_DEFAULT_STD_CXX)
       LangStd = CLANG_DEFAULT_STD_CXX;
 #else
       LangStd = LangStandard::lang_gnucxx14;
 #endif
       break;
     case Language::RenderScript:
       LangStd = LangStandard::lang_c99;
       break;
     case Language::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() == Language::HIP;
   Opts.CUDA = IK.getLanguage() == Language::CUDA || Opts.HIP;
   if (Opts.CUDA)
     // Set default FP_CONTRACT to FAST.
     Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
 
   Opts.RenderScript = IK.getLanguage() == Language::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;
 }
 
 /// 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 Language::Unknown:
   case Language::LLVM_IR:
     llvm_unreachable("should not parse language flags for this input");
 
   case Language::C:
   case Language::ObjC:
   case Language::RenderScript:
     return S.getLanguage() == Language::C;
 
   case Language::OpenCL:
     return S.getLanguage() == Language::OpenCL;
 
   case Language::CXX:
   case Language::ObjCXX:
     return S.getLanguage() == Language::CXX;
 
   case Language::CUDA:
     // FIXME: What -std= values should be permitted for CUDA compilations?
     return S.getLanguage() == Language::CUDA ||
            S.getLanguage() == Language::CXX;
 
   case Language::HIP:
     return S.getLanguage() == Language::CXX || S.getLanguage() == Language::HIP;
 
   case Language::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 Language::C:
     return "C";
   case Language::ObjC:
     return "Objective-C";
   case Language::CXX:
     return "C++";
   case Language::ObjCXX:
     return "Objective-C++";
   case Language::OpenCL:
     return "OpenCL";
   case Language::CUDA:
     return "CUDA";
   case Language::RenderScript:
     return "RenderScript";
   case Language::HIP:
     return "HIP";
 
   case Language::Asm:
     return "Asm";
   case Language::LLVM_IR:
     return "LLVM IR";
 
   case Language::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 = LangStandard::getLangKind(A->getValue());
     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/Basic/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/Basic/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)
         .Cases("clc++", "CLC++", 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);
   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 and set default version to 4.5.
   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 45 : 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::GenerateInterfaceIfsExpV1:
   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,
+                                        ArrayRef<const char *> CommandLineArgs,
                                         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);
+  InputArgList Args = Opts->ParseArgs(CommandLineArgs, 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() == Language::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 Language::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
diff --git a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
index ea7de7a41112..ab62b633cda3 100644
--- a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
+++ b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
@@ -1,99 +1,97 @@
 //===--- CreateInvocationFromCommandLine.cpp - CompilerInvocation from Args ==//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // Construct a compiler invocation object for command line driver arguments
 //
 //===----------------------------------------------------------------------===//
 
 #include "clang/Frontend/Utils.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Options.h"
 #include "clang/Driver/Tool.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/Host.h"
 using namespace clang;
 using namespace llvm::opt;
 
 std::unique_ptr<CompilerInvocation> clang::createInvocationFromCommandLine(
     ArrayRef<const char *> ArgList, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
     IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS, bool ShouldRecoverOnErorrs) {
   if (!Diags.get()) {
     // No diagnostics engine was provided, so create our own diagnostics object
     // with the default options.
     Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions);
   }
 
   SmallVector<const char *, 16> Args(ArgList.begin(), ArgList.end());
 
   // FIXME: Find a cleaner way to force the driver into restricted modes.
   Args.push_back("-fsyntax-only");
 
   // FIXME: We shouldn't have to pass in the path info.
   driver::Driver TheDriver(Args[0], llvm::sys::getDefaultTargetTriple(),
                            *Diags, VFS);
 
   // Don't check that inputs exist, they may have been remapped.
   TheDriver.setCheckInputsExist(false);
 
   std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
   if (!C)
     return nullptr;
 
   // Just print the cc1 options if -### was present.
   if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
     C->getJobs().Print(llvm::errs(), "\n", true);
     return nullptr;
   }
 
   // We expect to get back exactly one command job, if we didn't something
   // failed. Offload compilation is an exception as it creates multiple jobs. If
   // that's the case, we proceed with the first job. If caller needs a
   // particular job, it should be controlled via options (e.g.
   // --cuda-{host|device}-only for CUDA) passed to the driver.
   const driver::JobList &Jobs = C->getJobs();
   bool OffloadCompilation = false;
   if (Jobs.size() > 1) {
     for (auto &A : C->getActions()){
       // On MacOSX real actions may end up being wrapped in BindArchAction
       if (isa<driver::BindArchAction>(A))
         A = *A->input_begin();
       if (isa<driver::OffloadAction>(A)) {
         OffloadCompilation = true;
         break;
       }
     }
   }
   if (Jobs.size() == 0 || !isa<driver::Command>(*Jobs.begin()) ||
       (Jobs.size() > 1 && !OffloadCompilation)) {
     SmallString<256> Msg;
     llvm::raw_svector_ostream OS(Msg);
     Jobs.Print(OS, "; ", true);
     Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
     return nullptr;
   }
 
   const driver::Command &Cmd = cast<driver::Command>(*Jobs.begin());
   if (StringRef(Cmd.getCreator().getName()) != "clang") {
     Diags->Report(diag::err_fe_expected_clang_command);
     return nullptr;
   }
 
   const ArgStringList &CCArgs = Cmd.getArguments();
   auto CI = std::make_unique<CompilerInvocation>();
-  if (!CompilerInvocation::CreateFromArgs(
-          *CI, const_cast<const char **>(CCArgs.data()),
-          const_cast<const char **>(CCArgs.data()) + CCArgs.size(), *Diags) &&
+  if (!CompilerInvocation::CreateFromArgs(*CI, CCArgs, *Diags) &&
       !ShouldRecoverOnErorrs)
     return nullptr;
   return CI;
 }
diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index 291df0ae333d..b21fc33ac39f 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -1,615 +1,613 @@
 //===- Tooling.cpp - Running clang standalone tools -----------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 //  This file implements functions to run clang tools standalone instead
 //  of running them as a plugin.
 //
 //===----------------------------------------------------------------------===//
 
 #include "clang/Tooling/Tooling.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticIDs.h"
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/FileSystemOptions.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/Job.h"
 #include "clang/Driver/Options.h"
 #include "clang/Driver/Tool.h"
 #include "clang/Driver/ToolChain.h"
 #include "clang/Frontend/ASTUnit.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/FrontendOptions.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Lex/HeaderSearchOptions.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "clang/Tooling/ArgumentsAdjusters.h"
 #include "clang/Tooling/CompilationDatabase.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
 #include <cstring>
 #include <memory>
 #include <string>
 #include <system_error>
 #include <utility>
 #include <vector>
 
 #define DEBUG_TYPE "clang-tooling"
 
 using namespace clang;
 using namespace tooling;
 
 ToolAction::~ToolAction() = default;
 
 FrontendActionFactory::~FrontendActionFactory() = default;
 
 // FIXME: This file contains structural duplication with other parts of the
 // code that sets up a compiler to run tools on it, and we should refactor
 // it to be based on the same framework.
 
 /// Builds a clang driver initialized for running clang tools.
 static driver::Driver *
 newDriver(DiagnosticsEngine *Diagnostics, const char *BinaryName,
           IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
   driver::Driver *CompilerDriver =
       new driver::Driver(BinaryName, llvm::sys::getDefaultTargetTriple(),
                          *Diagnostics, std::move(VFS));
   CompilerDriver->setTitle("clang_based_tool");
   return CompilerDriver;
 }
 
 /// Retrieves the clang CC1 specific flags out of the compilation's jobs.
 ///
 /// Returns nullptr on error.
 static const llvm::opt::ArgStringList *getCC1Arguments(
     DiagnosticsEngine *Diagnostics, driver::Compilation *Compilation) {
   // We expect to get back exactly one Command job, if we didn't something
   // failed. Extract that job from the Compilation.
   const driver::JobList &Jobs = Compilation->getJobs();
   if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
     SmallString<256> error_msg;
     llvm::raw_svector_ostream error_stream(error_msg);
     Jobs.Print(error_stream, "; ", true);
     Diagnostics->Report(diag::err_fe_expected_compiler_job)
         << error_stream.str();
     return nullptr;
   }
 
   // The one job we find should be to invoke clang again.
   const auto &Cmd = cast<driver::Command>(*Jobs.begin());
   if (StringRef(Cmd.getCreator().getName()) != "clang") {
     Diagnostics->Report(diag::err_fe_expected_clang_command);
     return nullptr;
   }
 
   return &Cmd.getArguments();
 }
 
 namespace clang {
 namespace tooling {
 
 /// Returns a clang build invocation initialized from the CC1 flags.
 CompilerInvocation *newInvocation(
     DiagnosticsEngine *Diagnostics, const llvm::opt::ArgStringList &CC1Args) {
   assert(!CC1Args.empty() && "Must at least contain the program name!");
   CompilerInvocation *Invocation = new CompilerInvocation;
-  CompilerInvocation::CreateFromArgs(
-      *Invocation, CC1Args.data() + 1, CC1Args.data() + CC1Args.size(),
-      *Diagnostics);
+  CompilerInvocation::CreateFromArgs(*Invocation, CC1Args, *Diagnostics);
   Invocation->getFrontendOpts().DisableFree = false;
   Invocation->getCodeGenOpts().DisableFree = false;
   return Invocation;
 }
 
 bool runToolOnCode(FrontendAction *ToolAction, const Twine &Code,
                    const Twine &FileName,
                    std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
   return runToolOnCodeWithArgs(ToolAction, Code, std::vector<std::string>(),
                                FileName, "clang-tool",
                                std::move(PCHContainerOps));
 }
 
 } // namespace tooling
 } // namespace clang
 
 static std::vector<std::string>
 getSyntaxOnlyToolArgs(const Twine &ToolName,
                       const std::vector<std::string> &ExtraArgs,
                       StringRef FileName) {
   std::vector<std::string> Args;
   Args.push_back(ToolName.str());
   Args.push_back("-fsyntax-only");
   Args.insert(Args.end(), ExtraArgs.begin(), ExtraArgs.end());
   Args.push_back(FileName.str());
   return Args;
 }
 
 namespace clang {
 namespace tooling {
 
 bool runToolOnCodeWithArgs(
     FrontendAction *ToolAction, const Twine &Code,
     llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
     const std::vector<std::string> &Args, const Twine &FileName,
     const Twine &ToolName,
     std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
   SmallString<16> FileNameStorage;
   StringRef FileNameRef = FileName.toNullTerminatedStringRef(FileNameStorage);
 
   llvm::IntrusiveRefCntPtr<FileManager> Files(
       new FileManager(FileSystemOptions(), VFS));
   ArgumentsAdjuster Adjuster = getClangStripDependencyFileAdjuster();
   ToolInvocation Invocation(
       getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileNameRef), FileNameRef),
       ToolAction, Files.get(),
       std::move(PCHContainerOps));
   return Invocation.run();
 }
 
 bool runToolOnCodeWithArgs(
     FrontendAction *ToolAction, const Twine &Code,
     const std::vector<std::string> &Args, const Twine &FileName,
     const Twine &ToolName,
     std::shared_ptr<PCHContainerOperations> PCHContainerOps,
     const FileContentMappings &VirtualMappedFiles) {
   llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
       new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
   llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
       new llvm::vfs::InMemoryFileSystem);
   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
 
   SmallString<1024> CodeStorage;
   InMemoryFileSystem->addFile(FileName, 0,
                               llvm::MemoryBuffer::getMemBuffer(
                                   Code.toNullTerminatedStringRef(CodeStorage)));
 
   for (auto &FilenameWithContent : VirtualMappedFiles) {
     InMemoryFileSystem->addFile(
         FilenameWithContent.first, 0,
         llvm::MemoryBuffer::getMemBuffer(FilenameWithContent.second));
   }
 
   return runToolOnCodeWithArgs(ToolAction, Code, OverlayFileSystem, Args,
                                FileName, ToolName);
 }
 
 llvm::Expected<std::string> getAbsolutePath(llvm::vfs::FileSystem &FS,
                                             StringRef File) {
   StringRef RelativePath(File);
   // FIXME: Should '.\\' be accepted on Win32?
   if (RelativePath.startswith("./")) {
     RelativePath = RelativePath.substr(strlen("./"));
   }
 
   SmallString<1024> AbsolutePath = RelativePath;
   if (auto EC = FS.makeAbsolute(AbsolutePath))
     return llvm::errorCodeToError(EC);
   llvm::sys::path::native(AbsolutePath);
   return AbsolutePath.str();
 }
 
 std::string getAbsolutePath(StringRef File) {
   return llvm::cantFail(getAbsolutePath(*llvm::vfs::getRealFileSystem(), File));
 }
 
 void addTargetAndModeForProgramName(std::vector<std::string> &CommandLine,
                                     StringRef InvokedAs) {
   if (!CommandLine.empty() && !InvokedAs.empty()) {
     bool AlreadyHasTarget = false;
     bool AlreadyHasMode = false;
     // Skip CommandLine[0].
     for (auto Token = ++CommandLine.begin(); Token != CommandLine.end();
          ++Token) {
       StringRef TokenRef(*Token);
       AlreadyHasTarget |=
           (TokenRef == "-target" || TokenRef.startswith("-target="));
       AlreadyHasMode |= (TokenRef == "--driver-mode" ||
                          TokenRef.startswith("--driver-mode="));
     }
     auto TargetMode =
         driver::ToolChain::getTargetAndModeFromProgramName(InvokedAs);
     if (!AlreadyHasMode && TargetMode.DriverMode) {
       CommandLine.insert(++CommandLine.begin(), TargetMode.DriverMode);
     }
     if (!AlreadyHasTarget && TargetMode.TargetIsValid) {
       CommandLine.insert(++CommandLine.begin(), {"-target",
                                                  TargetMode.TargetPrefix});
     }
   }
 }
 
 } // namespace tooling
 } // namespace clang
 
 namespace {
 
 class SingleFrontendActionFactory : public FrontendActionFactory {
   FrontendAction *Action;
 
 public:
   SingleFrontendActionFactory(FrontendAction *Action) : Action(Action) {}
 
   FrontendAction *create() override { return Action; }
 };
 
 } // namespace
 
 ToolInvocation::ToolInvocation(
     std::vector<std::string> CommandLine, ToolAction *Action,
     FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
     : CommandLine(std::move(CommandLine)), Action(Action), OwnsAction(false),
       Files(Files), PCHContainerOps(std::move(PCHContainerOps)) {}
 
 ToolInvocation::ToolInvocation(
     std::vector<std::string> CommandLine, FrontendAction *FAction,
     FileManager *Files, std::shared_ptr<PCHContainerOperations> PCHContainerOps)
     : CommandLine(std::move(CommandLine)),
       Action(new SingleFrontendActionFactory(FAction)), OwnsAction(true),
       Files(Files), PCHContainerOps(std::move(PCHContainerOps)) {}
 
 ToolInvocation::~ToolInvocation() {
   if (OwnsAction)
     delete Action;
 }
 
 void ToolInvocation::mapVirtualFile(StringRef FilePath, StringRef Content) {
   SmallString<1024> PathStorage;
   llvm::sys::path::native(FilePath, PathStorage);
   MappedFileContents[PathStorage] = Content;
 }
 
 bool ToolInvocation::run() {
   std::vector<const char*> Argv;
   for (const std::string &Str : CommandLine)
     Argv.push_back(Str.c_str());
   const char *const BinaryName = Argv[0];
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   unsigned MissingArgIndex, MissingArgCount;
   std::unique_ptr<llvm::opt::OptTable> Opts = driver::createDriverOptTable();
   llvm::opt::InputArgList ParsedArgs = Opts->ParseArgs(
       ArrayRef<const char *>(Argv).slice(1), MissingArgIndex, MissingArgCount);
   ParseDiagnosticArgs(*DiagOpts, ParsedArgs);
   TextDiagnosticPrinter DiagnosticPrinter(
       llvm::errs(), &*DiagOpts);
   DiagnosticsEngine Diagnostics(
       IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
       DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
 
   const std::unique_ptr<driver::Driver> Driver(
       newDriver(&Diagnostics, BinaryName, &Files->getVirtualFileSystem()));
   // The "input file not found" diagnostics from the driver are useful.
   // The driver is only aware of the VFS working directory, but some clients
   // change this at the FileManager level instead.
   // In this case the checks have false positives, so skip them.
   if (!Files->getFileSystemOpts().WorkingDir.empty())
     Driver->setCheckInputsExist(false);
   const std::unique_ptr<driver::Compilation> Compilation(
       Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
   if (!Compilation)
     return false;
   const llvm::opt::ArgStringList *const CC1Args = getCC1Arguments(
       &Diagnostics, Compilation.get());
   if (!CC1Args)
     return false;
   std::unique_ptr<CompilerInvocation> Invocation(
       newInvocation(&Diagnostics, *CC1Args));
   // FIXME: remove this when all users have migrated!
   for (const auto &It : MappedFileContents) {
     // Inject the code as the given file name into the preprocessor options.
     std::unique_ptr<llvm::MemoryBuffer> Input =
         llvm::MemoryBuffer::getMemBuffer(It.getValue());
     Invocation->getPreprocessorOpts().addRemappedFile(It.getKey(),
                                                       Input.release());
   }
   return runInvocation(BinaryName, Compilation.get(), std::move(Invocation),
                        std::move(PCHContainerOps));
 }
 
 bool ToolInvocation::runInvocation(
     const char *BinaryName, driver::Compilation *Compilation,
     std::shared_ptr<CompilerInvocation> Invocation,
     std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
   // Show the invocation, with -v.
   if (Invocation->getHeaderSearchOpts().Verbose) {
     llvm::errs() << "clang Invocation:\n";
     Compilation->getJobs().Print(llvm::errs(), "\n", true);
     llvm::errs() << "\n";
   }
 
   return Action->runInvocation(std::move(Invocation), Files,
                                std::move(PCHContainerOps), DiagConsumer);
 }
 
 bool FrontendActionFactory::runInvocation(
     std::shared_ptr<CompilerInvocation> Invocation, FileManager *Files,
     std::shared_ptr<PCHContainerOperations> PCHContainerOps,
     DiagnosticConsumer *DiagConsumer) {
   // Create a compiler instance to handle the actual work.
   CompilerInstance Compiler(std::move(PCHContainerOps));
   Compiler.setInvocation(std::move(Invocation));
   Compiler.setFileManager(Files);
 
   // The FrontendAction can have lifetime requirements for Compiler or its
   // members, and we need to ensure it's deleted earlier than Compiler. So we
   // pass it to an std::unique_ptr declared after the Compiler variable.
   std::unique_ptr<FrontendAction> ScopedToolAction(create());
 
   // Create the compiler's actual diagnostics engine.
   Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
   if (!Compiler.hasDiagnostics())
     return false;
 
   Compiler.createSourceManager(*Files);
 
   const bool Success = Compiler.ExecuteAction(*ScopedToolAction);
 
   Files->clearStatCache();
   return Success;
 }
 
 ClangTool::ClangTool(const CompilationDatabase &Compilations,
                      ArrayRef<std::string> SourcePaths,
                      std::shared_ptr<PCHContainerOperations> PCHContainerOps,
                      IntrusiveRefCntPtr<llvm::vfs::FileSystem> BaseFS)
     : Compilations(Compilations), SourcePaths(SourcePaths),
       PCHContainerOps(std::move(PCHContainerOps)),
       OverlayFileSystem(new llvm::vfs::OverlayFileSystem(std::move(BaseFS))),
       InMemoryFileSystem(new llvm::vfs::InMemoryFileSystem),
       Files(new FileManager(FileSystemOptions(), OverlayFileSystem)) {
   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
   appendArgumentsAdjuster(getClangStripOutputAdjuster());
   appendArgumentsAdjuster(getClangSyntaxOnlyAdjuster());
   appendArgumentsAdjuster(getClangStripDependencyFileAdjuster());
 }
 
 ClangTool::~ClangTool() = default;
 
 void ClangTool::mapVirtualFile(StringRef FilePath, StringRef Content) {
   MappedFileContents.push_back(std::make_pair(FilePath, Content));
 }
 
 void ClangTool::appendArgumentsAdjuster(ArgumentsAdjuster Adjuster) {
   ArgsAdjuster = combineAdjusters(std::move(ArgsAdjuster), std::move(Adjuster));
 }
 
 void ClangTool::clearArgumentsAdjusters() {
   ArgsAdjuster = nullptr;
 }
 
 static void injectResourceDir(CommandLineArguments &Args, const char *Argv0,
                               void *MainAddr) {
   // Allow users to override the resource dir.
   for (StringRef Arg : Args)
     if (Arg.startswith("-resource-dir"))
       return;
 
   // If there's no override in place add our resource dir.
   Args.push_back("-resource-dir=" +
                  CompilerInvocation::GetResourcesPath(Argv0, MainAddr));
 }
 
 int ClangTool::run(ToolAction *Action) {
   // Exists solely for the purpose of lookup of the resource path.
   // This just needs to be some symbol in the binary.
   static int StaticSymbol;
 
   // First insert all absolute paths into the in-memory VFS. These are global
   // for all compile commands.
   if (SeenWorkingDirectories.insert("/").second)
     for (const auto &MappedFile : MappedFileContents)
       if (llvm::sys::path::is_absolute(MappedFile.first))
         InMemoryFileSystem->addFile(
             MappedFile.first, 0,
             llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
 
   bool ProcessingFailed = false;
   bool FileSkipped = false;
   // Compute all absolute paths before we run any actions, as those will change
   // the working directory.
   std::vector<std::string> AbsolutePaths;
   AbsolutePaths.reserve(SourcePaths.size());
   for (const auto &SourcePath : SourcePaths) {
     auto AbsPath = getAbsolutePath(*OverlayFileSystem, SourcePath);
     if (!AbsPath) {
       llvm::errs() << "Skipping " << SourcePath
                    << ". Error while getting an absolute path: "
                    << llvm::toString(AbsPath.takeError()) << "\n";
       continue;
     }
     AbsolutePaths.push_back(std::move(*AbsPath));
   }
 
   // Remember the working directory in case we need to restore it.
   std::string InitialWorkingDir;
   if (RestoreCWD) {
     if (auto CWD = OverlayFileSystem->getCurrentWorkingDirectory()) {
       InitialWorkingDir = std::move(*CWD);
     } else {
       llvm::errs() << "Could not get working directory: "
                    << CWD.getError().message() << "\n";
     }
   }
 
   for (llvm::StringRef File : AbsolutePaths) {
     // Currently implementations of CompilationDatabase::getCompileCommands can
     // change the state of the file system (e.g.  prepare generated headers), so
     // this method needs to run right before we invoke the tool, as the next
     // file may require a different (incompatible) state of the file system.
     //
     // FIXME: Make the compilation database interface more explicit about the
     // requirements to the order of invocation of its members.
     std::vector<CompileCommand> CompileCommandsForFile =
         Compilations.getCompileCommands(File);
     if (CompileCommandsForFile.empty()) {
       llvm::errs() << "Skipping " << File << ". Compile command not found.\n";
       FileSkipped = true;
       continue;
     }
     for (CompileCommand &CompileCommand : CompileCommandsForFile) {
       // FIXME: chdir is thread hostile; on the other hand, creating the same
       // behavior as chdir is complex: chdir resolves the path once, thus
       // guaranteeing that all subsequent relative path operations work
       // on the same path the original chdir resulted in. This makes a
       // difference for example on network filesystems, where symlinks might be
       // switched during runtime of the tool. Fixing this depends on having a
       // file system abstraction that allows openat() style interactions.
       if (OverlayFileSystem->setCurrentWorkingDirectory(
               CompileCommand.Directory))
         llvm::report_fatal_error("Cannot chdir into \"" +
                                  Twine(CompileCommand.Directory) + "\"!");
 
       // Now fill the in-memory VFS with the relative file mappings so it will
       // have the correct relative paths. We never remove mappings but that
       // should be fine.
       if (SeenWorkingDirectories.insert(CompileCommand.Directory).second)
         for (const auto &MappedFile : MappedFileContents)
           if (!llvm::sys::path::is_absolute(MappedFile.first))
             InMemoryFileSystem->addFile(
                 MappedFile.first, 0,
                 llvm::MemoryBuffer::getMemBuffer(MappedFile.second));
 
       std::vector<std::string> CommandLine = CompileCommand.CommandLine;
       if (ArgsAdjuster)
         CommandLine = ArgsAdjuster(CommandLine, CompileCommand.Filename);
       assert(!CommandLine.empty());
 
       // Add the resource dir based on the binary of this tool. argv[0] in the
       // compilation database may refer to a different compiler and we want to
       // pick up the very same standard library that compiler is using. The
       // builtin headers in the resource dir need to match the exact clang
       // version the tool is using.
       // FIXME: On linux, GetMainExecutable is independent of the value of the
       // first argument, thus allowing ClangTool and runToolOnCode to just
       // pass in made-up names here. Make sure this works on other platforms.
       injectResourceDir(CommandLine, "clang_tool", &StaticSymbol);
 
       // FIXME: We need a callback mechanism for the tool writer to output a
       // customized message for each file.
       LLVM_DEBUG({ llvm::dbgs() << "Processing: " << File << ".\n"; });
       ToolInvocation Invocation(std::move(CommandLine), Action, Files.get(),
                                 PCHContainerOps);
       Invocation.setDiagnosticConsumer(DiagConsumer);
 
       if (!Invocation.run()) {
         // FIXME: Diagnostics should be used instead.
         if (PrintErrorMessage)
           llvm::errs() << "Error while processing " << File << ".\n";
         ProcessingFailed = true;
       }
     }
   }
 
   if (!InitialWorkingDir.empty()) {
     if (auto EC =
             OverlayFileSystem->setCurrentWorkingDirectory(InitialWorkingDir))
       llvm::errs() << "Error when trying to restore working dir: "
                    << EC.message() << "\n";
   }
   return ProcessingFailed ? 1 : (FileSkipped ? 2 : 0);
 }
 
 namespace {
 
 class ASTBuilderAction : public ToolAction {
   std::vector<std::unique_ptr<ASTUnit>> &ASTs;
 
 public:
   ASTBuilderAction(std::vector<std::unique_ptr<ASTUnit>> &ASTs) : ASTs(ASTs) {}
 
   bool runInvocation(std::shared_ptr<CompilerInvocation> Invocation,
                      FileManager *Files,
                      std::shared_ptr<PCHContainerOperations> PCHContainerOps,
                      DiagnosticConsumer *DiagConsumer) override {
     std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromCompilerInvocation(
         Invocation, std::move(PCHContainerOps),
         CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts(),
                                             DiagConsumer,
                                             /*ShouldOwnClient=*/false),
         Files);
     if (!AST)
       return false;
 
     ASTs.push_back(std::move(AST));
     return true;
   }
 };
 
 } // namespace
 
 int ClangTool::buildASTs(std::vector<std::unique_ptr<ASTUnit>> &ASTs) {
   ASTBuilderAction Action(ASTs);
   return run(&Action);
 }
 
 void ClangTool::setRestoreWorkingDir(bool RestoreCWD) {
   this->RestoreCWD = RestoreCWD;
 }
 
 void ClangTool::setPrintErrorMessage(bool PrintErrorMessage) {
   this->PrintErrorMessage = PrintErrorMessage;
 }
 
 namespace clang {
 namespace tooling {
 
 std::unique_ptr<ASTUnit>
 buildASTFromCode(StringRef Code, StringRef FileName,
                  std::shared_ptr<PCHContainerOperations> PCHContainerOps) {
   return buildASTFromCodeWithArgs(Code, std::vector<std::string>(), FileName,
                                   "clang-tool", std::move(PCHContainerOps));
 }
 
 std::unique_ptr<ASTUnit> buildASTFromCodeWithArgs(
     StringRef Code, const std::vector<std::string> &Args, StringRef FileName,
     StringRef ToolName, std::shared_ptr<PCHContainerOperations> PCHContainerOps,
     ArgumentsAdjuster Adjuster) {
   std::vector<std::unique_ptr<ASTUnit>> ASTs;
   ASTBuilderAction Action(ASTs);
   llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
       new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
   llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
       new llvm::vfs::InMemoryFileSystem);
   OverlayFileSystem->pushOverlay(InMemoryFileSystem);
   llvm::IntrusiveRefCntPtr<FileManager> Files(
       new FileManager(FileSystemOptions(), OverlayFileSystem));
 
   ToolInvocation Invocation(
       getSyntaxOnlyToolArgs(ToolName, Adjuster(Args, FileName), FileName),
       &Action, Files.get(), std::move(PCHContainerOps));
 
   InMemoryFileSystem->addFile(FileName, 0,
                               llvm::MemoryBuffer::getMemBufferCopy(Code));
   if (!Invocation.run())
     return nullptr;
 
   assert(ASTs.size() == 1);
   return std::move(ASTs[0]);
 }
 
 } // namespace tooling
 } // namespace clang
diff --git a/clang/tools/arcmt-test/arcmt-test.cpp b/clang/tools/arcmt-test/arcmt-test.cpp
index 5f075f860f54..c4ba12d4f7cf 100644
--- a/clang/tools/arcmt-test/arcmt-test.cpp
+++ b/clang/tools/arcmt-test/arcmt-test.cpp
@@ -1,376 +1,375 @@
 //===-- arcmt-test.cpp - ARC Migration Tool testbed -----------------------===//
 //
 // 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/ARCMigrate/ARCMT.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/Frontend/PCHContainerOperations.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Frontend/VerifyDiagnosticConsumer.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Signals.h"
 #include <system_error>
 
 using namespace clang;
 using namespace arcmt;
 
 static llvm::cl::opt<bool>
 CheckOnly("check-only",
       llvm::cl::desc("Just check for issues that need to be handled manually"));
 
 //static llvm::cl::opt<bool>
 //TestResultForARC("test-result",
 //llvm::cl::desc("Test the result of transformations by parsing it in ARC mode"));
 
 static llvm::cl::opt<bool>
 OutputTransformations("output-transformations",
                       llvm::cl::desc("Print the source transformations"));
 
 static llvm::cl::opt<bool>
 VerifyDiags("verify",llvm::cl::desc("Verify emitted diagnostics and warnings"));
 
 static llvm::cl::opt<bool>
 VerboseOpt("v", llvm::cl::desc("Enable verbose output"));
 
 static llvm::cl::opt<bool>
 VerifyTransformedFiles("verify-transformed-files",
 llvm::cl::desc("Read pairs of file mappings (typically the output of "
                "c-arcmt-test) and compare their contents with the filenames "
                "provided in command-line"));
 
 static llvm::cl::opt<std::string>
 RemappingsFile("remappings-file",
                llvm::cl::desc("Pairs of file mappings (typically the output of "
                "c-arcmt-test)"));
 
 static llvm::cl::list<std::string>
 ResultFiles(llvm::cl::Positional, llvm::cl::desc("<filename>..."));
 
 static llvm::cl::extrahelp extraHelp(
   "\nusage with compiler args: arcmt-test [options] --args [compiler flags]\n");
 
 // This function isn't referenced outside its translation unit, but it
 // can't use the "static" keyword because its address is used for
 // GetMainExecutable (since some platforms don't support taking the
 // address of main, and some platforms can't implement GetMainExecutable
 // without being given the address of a function in the main executable).
 std::string GetExecutablePath(const char *Argv0) {
   // This just needs to be some symbol in the binary; C++ doesn't
   // allow taking the address of ::main however.
   void *MainAddr = (void*) (intptr_t) GetExecutablePath;
   return llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
 }
 
 static void printSourceLocation(SourceLocation loc, ASTContext &Ctx,
                                 raw_ostream &OS);
 static void printSourceRange(CharSourceRange range, ASTContext &Ctx,
                              raw_ostream &OS);
 
 namespace {
 
 class PrintTransforms : public MigrationProcess::RewriteListener {
   ASTContext *Ctx;
   raw_ostream &OS;
 
 public:
   PrintTransforms(raw_ostream &OS)
     : Ctx(nullptr), OS(OS) {}
 
   void start(ASTContext &ctx) override { Ctx = &ctx; }
   void finish() override { Ctx = nullptr; }
 
   void insert(SourceLocation loc, StringRef text) override {
     assert(Ctx);
     OS << "Insert: ";
     printSourceLocation(loc, *Ctx, OS);
     OS << " \"" << text << "\"\n";
   }
 
   void remove(CharSourceRange range) override {
     assert(Ctx);
     OS << "Remove: ";
     printSourceRange(range, *Ctx, OS);
     OS << '\n';
   }
 };
 
 } // anonymous namespace
 
 static bool checkForMigration(StringRef resourcesPath,
                               ArrayRef<const char *> Args) {
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   DiagnosticConsumer *DiagClient =
     new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
       new DiagnosticsEngine(DiagID, &*DiagOpts, DiagClient));
   // Chain in -verify checker, if requested.
   VerifyDiagnosticConsumer *verifyDiag = nullptr;
   if (VerifyDiags) {
     verifyDiag = new VerifyDiagnosticConsumer(*Diags);
     Diags->setClient(verifyDiag);
   }
 
   CompilerInvocation CI;
-  if (!CompilerInvocation::CreateFromArgs(CI, Args.begin(), Args.end(), *Diags))
+  if (!CompilerInvocation::CreateFromArgs(CI, Args, *Diags))
     return true;
 
   if (CI.getFrontendOpts().Inputs.empty()) {
     llvm::errs() << "error: no input files\n";
     return true;
   }
 
   if (!CI.getLangOpts()->ObjC)
     return false;
 
   arcmt::checkForManualIssues(CI, CI.getFrontendOpts().Inputs[0],
                               std::make_shared<PCHContainerOperations>(),
                               Diags->getClient());
   return Diags->getClient()->getNumErrors() > 0;
 }
 
 static void printResult(FileRemapper &remapper, raw_ostream &OS) {
   PreprocessorOptions PPOpts;
   remapper.applyMappings(PPOpts);
   // The changed files will be in memory buffers, print them.
   for (const auto &RB : PPOpts.RemappedFileBuffers)
     OS << RB.second->getBuffer();
 }
 
 static bool performTransformations(StringRef resourcesPath,
                                    ArrayRef<const char *> Args) {
   // Check first.
   if (checkForMigration(resourcesPath, Args))
     return true;
 
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   DiagnosticConsumer *DiagClient =
     new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
   IntrusiveRefCntPtr<DiagnosticsEngine> TopDiags(
       new DiagnosticsEngine(DiagID, &*DiagOpts, &*DiagClient));
 
   CompilerInvocation origCI;
-  if (!CompilerInvocation::CreateFromArgs(origCI, Args.begin(), Args.end(),
-                                     *TopDiags))
+  if (!CompilerInvocation::CreateFromArgs(origCI, Args, *TopDiags))
     return true;
 
   if (origCI.getFrontendOpts().Inputs.empty()) {
     llvm::errs() << "error: no input files\n";
     return true;
   }
 
   if (!origCI.getLangOpts()->ObjC)
     return false;
 
   MigrationProcess migration(origCI, std::make_shared<PCHContainerOperations>(),
                              DiagClient);
 
   std::vector<TransformFn>
     transforms = arcmt::getAllTransformations(origCI.getLangOpts()->getGC(),
                                  origCI.getMigratorOpts().NoFinalizeRemoval);
   assert(!transforms.empty());
 
   std::unique_ptr<PrintTransforms> transformPrinter;
   if (OutputTransformations)
     transformPrinter.reset(new PrintTransforms(llvm::outs()));
 
   for (unsigned i=0, e = transforms.size(); i != e; ++i) {
     bool err = migration.applyTransform(transforms[i], transformPrinter.get());
     if (err) return true;
 
     if (VerboseOpt) {
       if (i == e-1)
         llvm::errs() << "\n##### FINAL RESULT #####\n";
       else
         llvm::errs() << "\n##### OUTPUT AFTER "<< i+1 <<". TRANSFORMATION #####\n";
       printResult(migration.getRemapper(), llvm::errs());
       llvm::errs() << "\n##########################\n\n";
     }
   }
 
   if (!OutputTransformations)
     printResult(migration.getRemapper(), llvm::outs());
 
   // FIXME: TestResultForARC
 
   return false;
 }
 
 static bool filesCompareEqual(StringRef fname1, StringRef fname2) {
   using namespace llvm;
 
   ErrorOr<std::unique_ptr<MemoryBuffer>> file1 = MemoryBuffer::getFile(fname1);
   if (!file1)
     return false;
 
   ErrorOr<std::unique_ptr<MemoryBuffer>> file2 = MemoryBuffer::getFile(fname2);
   if (!file2)
     return false;
 
   return file1.get()->getBuffer() == file2.get()->getBuffer();
 }
 
 static bool verifyTransformedFiles(ArrayRef<std::string> resultFiles) {
   using namespace llvm;
 
   assert(!resultFiles.empty());
 
   std::map<StringRef, StringRef> resultMap;
 
   for (ArrayRef<std::string>::iterator
          I = resultFiles.begin(), E = resultFiles.end(); I != E; ++I) {
     StringRef fname(*I);
     if (!fname.endswith(".result")) {
       errs() << "error: filename '" << fname
                    << "' does not have '.result' extension\n";
       return true;
     }
     resultMap[sys::path::stem(fname)] = fname;
   }
 
   ErrorOr<std::unique_ptr<MemoryBuffer>> inputBuf = std::error_code();
   if (RemappingsFile.empty())
     inputBuf = MemoryBuffer::getSTDIN();
   else
     inputBuf = MemoryBuffer::getFile(RemappingsFile);
   if (!inputBuf) {
     errs() << "error: could not read remappings input\n";
     return true;
   }
 
   SmallVector<StringRef, 8> strs;
   inputBuf.get()->getBuffer().split(strs, "\n", /*MaxSplit=*/-1,
                                     /*KeepEmpty=*/false);
 
   if (strs.empty()) {
     errs() << "error: no files to verify from stdin\n";
     return true;
   }
   if (strs.size() % 2 != 0) {
     errs() << "error: files to verify are not original/result pairs\n";
     return true;
   }
 
   for (unsigned i = 0, e = strs.size(); i != e; i += 2) {
     StringRef inputOrigFname = strs[i];
     StringRef inputResultFname = strs[i+1];
 
     std::map<StringRef, StringRef>::iterator It;
     It = resultMap.find(sys::path::filename(inputOrigFname));
     if (It == resultMap.end()) {
       errs() << "error: '" << inputOrigFname << "' is not in the list of "
              << "transformed files to verify\n";
       return true;
     }
 
     if (!sys::fs::exists(It->second)) {
       errs() << "error: '" << It->second << "' does not exist\n";
       return true;
     }
     if (!sys::fs::exists(inputResultFname)) {
       errs() << "error: '" << inputResultFname << "' does not exist\n";
       return true;
     }
 
     if (!filesCompareEqual(It->second, inputResultFname)) {
       errs() << "error: '" << It->second << "' is different than "
              << "'" << inputResultFname << "'\n";
       return true;
     }
 
     resultMap.erase(It);
   }
 
   if (!resultMap.empty()) {
     for (std::map<StringRef, StringRef>::iterator
            I = resultMap.begin(), E = resultMap.end(); I != E; ++I)
       errs() << "error: '" << I->second << "' was not verified!\n";
     return true;
   }
 
   return false; 
 }
 
 //===----------------------------------------------------------------------===//
 // Misc. functions.
 //===----------------------------------------------------------------------===//
 
 static void printSourceLocation(SourceLocation loc, ASTContext &Ctx,
                                 raw_ostream &OS) {
   SourceManager &SM = Ctx.getSourceManager();
   PresumedLoc PL = SM.getPresumedLoc(loc);
 
   OS << llvm::sys::path::filename(PL.getFilename());
   OS << ":" << PL.getLine() << ":"
             << PL.getColumn();
 }
 
 static void printSourceRange(CharSourceRange range, ASTContext &Ctx,
                              raw_ostream &OS) {
   SourceManager &SM = Ctx.getSourceManager();
   const LangOptions &langOpts = Ctx.getLangOpts();
 
   PresumedLoc PL = SM.getPresumedLoc(range.getBegin());
 
   OS << llvm::sys::path::filename(PL.getFilename());
   OS << " [" << PL.getLine() << ":"
              << PL.getColumn();
   OS << " - ";
 
   SourceLocation end = range.getEnd();
   PL = SM.getPresumedLoc(end);
 
   unsigned endCol = PL.getColumn() - 1;
   if (!range.isTokenRange())
     endCol += Lexer::MeasureTokenLength(end, SM, langOpts);
   OS << PL.getLine() << ":" << endCol << "]";
 }
 
 //===----------------------------------------------------------------------===//
 // Command line processing.
 //===----------------------------------------------------------------------===//
 
 int main(int argc, const char **argv) {
   void *MainAddr = (void*) (intptr_t) GetExecutablePath;
   llvm::sys::PrintStackTraceOnErrorSignal(argv[0]);
 
   std::string
     resourcesPath = CompilerInvocation::GetResourcesPath(argv[0], MainAddr);
 
   int optargc = 0;
   for (; optargc != argc; ++optargc) {
     if (StringRef(argv[optargc]) == "--args")
       break;
   }
   llvm::cl::ParseCommandLineOptions(optargc, argv, "arcmt-test");
 
   if (VerifyTransformedFiles) {
     if (ResultFiles.empty()) {
       llvm::cl::PrintHelpMessage();
       return 1;
     }
     return verifyTransformedFiles(ResultFiles);
   }
 
   if (optargc == argc) {
     llvm::cl::PrintHelpMessage();
     return 1;
   }
 
   ArrayRef<const char*> Args(argv+optargc+1, argc-optargc-1);
 
   if (CheckOnly)
     return checkForMigration(resourcesPath, Args);
 
   return performTransformations(resourcesPath, Args);
 }
diff --git a/clang/tools/clang-import-test/clang-import-test.cpp b/clang/tools/clang-import-test/clang-import-test.cpp
index a4d3e11c98e7..e8124d624267 100644
--- a/clang/tools/clang-import-test/clang-import-test.cpp
+++ b/clang/tools/clang-import-test/clang-import-test.cpp
@@ -1,384 +1,382 @@
 //===-- clang-import-test.cpp - ASTImporter/ExternalASTSource testbed -----===//
 //
 // 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/AST/ASTContext.h"
 #include "clang/AST/ASTImporter.h"
 #include "clang/AST/DeclObjC.h"
 #include "clang/AST/ExternalASTMerger.h"
 #include "clang/Basic/Builtins.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/TargetOptions.h"
 #include "clang/CodeGen/ModuleBuilder.h"
 #include "clang/Driver/Types.h"
 #include "clang/Frontend/ASTConsumers.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/MultiplexConsumer.h"
 #include "clang/Frontend/TextDiagnosticBuffer.h"
 #include "clang/Lex/Lexer.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Parse/ParseAST.h"
 
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/Signals.h"
 
 #include <memory>
 #include <string>
 
 using namespace clang;
 
 static llvm::cl::opt<std::string> Expression(
     "expression", llvm::cl::Required,
     llvm::cl::desc("Path to a file containing the expression to parse"));
 
 static llvm::cl::list<std::string>
     Imports("import", llvm::cl::ZeroOrMore,
             llvm::cl::desc("Path to a file containing declarations to import"));
 
 static llvm::cl::opt<bool>
     Direct("direct", llvm::cl::Optional,
            llvm::cl::desc("Use the parsed declarations without indirection"));
 
 static llvm::cl::opt<bool> UseOrigins(
     "use-origins", llvm::cl::Optional,
     llvm::cl::desc(
         "Use DeclContext origin information for more accurate lookups"));
 
 static llvm::cl::list<std::string>
     ClangArgs("Xcc", llvm::cl::ZeroOrMore,
               llvm::cl::desc("Argument to pass to the CompilerInvocation"),
               llvm::cl::CommaSeparated);
 
 static llvm::cl::opt<std::string>
     Input("x", llvm::cl::Optional,
           llvm::cl::desc("The language to parse (default: c++)"),
           llvm::cl::init("c++"));
 
 static llvm::cl::opt<bool> DumpAST("dump-ast", llvm::cl::init(false),
                                    llvm::cl::desc("Dump combined AST"));
 
 static llvm::cl::opt<bool> DumpIR("dump-ir", llvm::cl::init(false),
                                   llvm::cl::desc("Dump IR from final parse"));
 
 namespace init_convenience {
 class TestDiagnosticConsumer : public DiagnosticConsumer {
 private:
   std::unique_ptr<TextDiagnosticBuffer> Passthrough;
   const LangOptions *LangOpts = nullptr;
 
 public:
   TestDiagnosticConsumer()
       : Passthrough(std::make_unique<TextDiagnosticBuffer>()) {}
 
   virtual void BeginSourceFile(const LangOptions &LangOpts,
                                const Preprocessor *PP = nullptr) override {
     this->LangOpts = &LangOpts;
     return Passthrough->BeginSourceFile(LangOpts, PP);
   }
 
   virtual void EndSourceFile() override {
     this->LangOpts = nullptr;
     Passthrough->EndSourceFile();
   }
 
   virtual bool IncludeInDiagnosticCounts() const override {
     return Passthrough->IncludeInDiagnosticCounts();
   }
 
 private:
   static void PrintSourceForLocation(const SourceLocation &Loc,
                                      SourceManager &SM) {
     const char *LocData = SM.getCharacterData(Loc, /*Invalid=*/nullptr);
     unsigned LocColumn =
         SM.getSpellingColumnNumber(Loc, /*Invalid=*/nullptr) - 1;
     FileID FID = SM.getFileID(Loc);
     const llvm::MemoryBuffer *Buffer =
         SM.getBuffer(FID, Loc, /*Invalid=*/nullptr);
 
     assert(LocData >= Buffer->getBufferStart() &&
            LocData < Buffer->getBufferEnd());
 
     const char *LineBegin = LocData - LocColumn;
 
     assert(LineBegin >= Buffer->getBufferStart());
 
     const char *LineEnd = nullptr;
 
     for (LineEnd = LineBegin; *LineEnd != '\n' && *LineEnd != '\r' &&
                               LineEnd < Buffer->getBufferEnd();
          ++LineEnd)
       ;
 
     llvm::StringRef LineString(LineBegin, LineEnd - LineBegin);
 
     llvm::errs() << LineString << '\n';
     llvm::errs().indent(LocColumn);
     llvm::errs() << '^';
     llvm::errs() << '\n';
   }
 
   virtual void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
                                 const Diagnostic &Info) override {
     if (Info.hasSourceManager() && LangOpts) {
       SourceManager &SM = Info.getSourceManager();
 
       if (Info.getLocation().isValid()) {
         Info.getLocation().print(llvm::errs(), SM);
         llvm::errs() << ": ";
       }
 
       SmallString<16> DiagText;
       Info.FormatDiagnostic(DiagText);
       llvm::errs() << DiagText << '\n';
 
       if (Info.getLocation().isValid()) {
         PrintSourceForLocation(Info.getLocation(), SM);
       }
 
       for (const CharSourceRange &Range : Info.getRanges()) {
         bool Invalid = true;
         StringRef Ref = Lexer::getSourceText(Range, SM, *LangOpts, &Invalid);
         if (!Invalid) {
           llvm::errs() << Ref << '\n';
         }
       }
     }
     DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
   }
 };
 
 std::unique_ptr<CompilerInstance> BuildCompilerInstance() {
   auto Ins = std::make_unique<CompilerInstance>();
   auto DC = std::make_unique<TestDiagnosticConsumer>();
   const bool ShouldOwnClient = true;
   Ins->createDiagnostics(DC.release(), ShouldOwnClient);
 
   auto Inv = std::make_unique<CompilerInvocation>();
 
   std::vector<const char *> ClangArgv(ClangArgs.size());
   std::transform(ClangArgs.begin(), ClangArgs.end(), ClangArgv.begin(),
                  [](const std::string &s) -> const char * { return s.data(); });
-  CompilerInvocation::CreateFromArgs(*Inv, ClangArgv.data(),
-                                     &ClangArgv.data()[ClangArgv.size()],
-                                     Ins->getDiagnostics());
+  CompilerInvocation::CreateFromArgs(*Inv, ClangArgv, Ins->getDiagnostics());
 
   {
     using namespace driver::types;
     ID Id = lookupTypeForTypeSpecifier(Input.c_str());
     assert(Id != TY_INVALID);
     if (isCXX(Id)) {
       Inv->getLangOpts()->CPlusPlus = true;
       Inv->getLangOpts()->CPlusPlus11 = true;
       Inv->getHeaderSearchOpts().UseLibcxx = true;
     }
     if (isObjC(Id)) {
       Inv->getLangOpts()->ObjC = 1;
     }
   }
   Inv->getLangOpts()->Bool = true;
   Inv->getLangOpts()->WChar = true;
   Inv->getLangOpts()->Blocks = true;
   Inv->getLangOpts()->DebuggerSupport = true;
   Inv->getLangOpts()->SpellChecking = false;
   Inv->getLangOpts()->ThreadsafeStatics = false;
   Inv->getLangOpts()->AccessControl = false;
   Inv->getLangOpts()->DollarIdents = true;
   Inv->getLangOpts()->Exceptions = true;
   Inv->getLangOpts()->CXXExceptions = true;
   // Needed for testing dynamic_cast.
   Inv->getLangOpts()->RTTI = true;
   Inv->getCodeGenOpts().setDebugInfo(codegenoptions::FullDebugInfo);
   Inv->getTargetOpts().Triple = llvm::sys::getDefaultTargetTriple();
 
   Ins->setInvocation(std::move(Inv));
 
   TargetInfo *TI = TargetInfo::CreateTargetInfo(
       Ins->getDiagnostics(), Ins->getInvocation().TargetOpts);
   Ins->setTarget(TI);
   Ins->getTarget().adjust(Ins->getLangOpts());
   Ins->createFileManager();
   Ins->createSourceManager(Ins->getFileManager());
   Ins->createPreprocessor(TU_Complete);
 
   return Ins;
 }
 
 std::unique_ptr<ASTContext>
 BuildASTContext(CompilerInstance &CI, SelectorTable &ST, Builtin::Context &BC) {
   auto AST = std::make_unique<ASTContext>(
       CI.getLangOpts(), CI.getSourceManager(),
       CI.getPreprocessor().getIdentifierTable(), ST, BC);
   AST->InitBuiltinTypes(CI.getTarget());
   return AST;
 }
 
 std::unique_ptr<CodeGenerator> BuildCodeGen(CompilerInstance &CI,
                                             llvm::LLVMContext &LLVMCtx) {
   StringRef ModuleName("$__module");
   return std::unique_ptr<CodeGenerator>(CreateLLVMCodeGen(
       CI.getDiagnostics(), ModuleName, CI.getHeaderSearchOpts(),
       CI.getPreprocessorOpts(), CI.getCodeGenOpts(), LLVMCtx));
 }
 } // namespace init_convenience
 
 namespace {
 
 /// A container for a CompilerInstance (possibly with an ExternalASTMerger
 /// attached to its ASTContext).
 ///
 /// Provides an accessor for the DeclContext origins associated with the
 /// ExternalASTMerger (or an empty list of origins if no ExternalASTMerger is
 /// attached).
 ///
 /// This is the main unit of parsed source code maintained by clang-import-test.
 struct CIAndOrigins {
   using OriginMap = clang::ExternalASTMerger::OriginMap;
   std::unique_ptr<CompilerInstance> CI;
 
   ASTContext &getASTContext() { return CI->getASTContext(); }
   FileManager &getFileManager() { return CI->getFileManager(); }
   const OriginMap &getOriginMap() {
     static const OriginMap EmptyOriginMap{};
     if (ExternalASTSource *Source = CI->getASTContext().getExternalSource())
       return static_cast<ExternalASTMerger *>(Source)->GetOrigins();
     return EmptyOriginMap;
   }
   DiagnosticConsumer &getDiagnosticClient() {
     return CI->getDiagnosticClient();
   }
   CompilerInstance &getCompilerInstance() { return *CI; }
 };
 
 void AddExternalSource(CIAndOrigins &CI,
                        llvm::MutableArrayRef<CIAndOrigins> Imports) {
   ExternalASTMerger::ImporterTarget Target(
       {CI.getASTContext(), CI.getFileManager()});
   llvm::SmallVector<ExternalASTMerger::ImporterSource, 3> Sources;
   for (CIAndOrigins &Import : Imports)
     Sources.push_back({Import.getASTContext(), Import.getFileManager(),
                        Import.getOriginMap()});
   auto ES = std::make_unique<ExternalASTMerger>(Target, Sources);
   CI.getASTContext().setExternalSource(ES.release());
   CI.getASTContext().getTranslationUnitDecl()->setHasExternalVisibleStorage();
 }
 
 CIAndOrigins BuildIndirect(CIAndOrigins &CI) {
   CIAndOrigins IndirectCI{init_convenience::BuildCompilerInstance()};
   auto ST = std::make_unique<SelectorTable>();
   auto BC = std::make_unique<Builtin::Context>();
   std::unique_ptr<ASTContext> AST = init_convenience::BuildASTContext(
       IndirectCI.getCompilerInstance(), *ST, *BC);
   IndirectCI.getCompilerInstance().setASTContext(AST.release());
   AddExternalSource(IndirectCI, CI);
   return IndirectCI;
 }
 
 llvm::Error ParseSource(const std::string &Path, CompilerInstance &CI,
                         ASTConsumer &Consumer) {
   SourceManager &SM = CI.getSourceManager();
   auto FE = CI.getFileManager().getFile(Path);
   if (!FE) {
     return llvm::make_error<llvm::StringError>(
         llvm::Twine("Couldn't open ", Path), std::error_code());
   }
   SM.setMainFileID(SM.createFileID(*FE, SourceLocation(), SrcMgr::C_User));
   ParseAST(CI.getPreprocessor(), &Consumer, CI.getASTContext());
   return llvm::Error::success();
 }
 
 llvm::Expected<CIAndOrigins> Parse(const std::string &Path,
                                    llvm::MutableArrayRef<CIAndOrigins> Imports,
                                    bool ShouldDumpAST, bool ShouldDumpIR) {
   CIAndOrigins CI{init_convenience::BuildCompilerInstance()};
   auto ST = std::make_unique<SelectorTable>();
   auto BC = std::make_unique<Builtin::Context>();
   std::unique_ptr<ASTContext> AST =
       init_convenience::BuildASTContext(CI.getCompilerInstance(), *ST, *BC);
   CI.getCompilerInstance().setASTContext(AST.release());
   if (Imports.size())
     AddExternalSource(CI, Imports);
 
   std::vector<std::unique_ptr<ASTConsumer>> ASTConsumers;
 
   auto LLVMCtx = std::make_unique<llvm::LLVMContext>();
   ASTConsumers.push_back(
       init_convenience::BuildCodeGen(CI.getCompilerInstance(), *LLVMCtx));
   auto &CG = *static_cast<CodeGenerator *>(ASTConsumers.back().get());
 
   if (ShouldDumpAST)
     ASTConsumers.push_back(
         CreateASTDumper(nullptr /*Dump to stdout.*/, "", true, false, false,
                         clang::ADOF_Default));
 
   CI.getDiagnosticClient().BeginSourceFile(
       CI.getCompilerInstance().getLangOpts(),
       &CI.getCompilerInstance().getPreprocessor());
   MultiplexConsumer Consumers(std::move(ASTConsumers));
   Consumers.Initialize(CI.getASTContext());
 
   if (llvm::Error PE = ParseSource(Path, CI.getCompilerInstance(), Consumers))
     return std::move(PE);
   CI.getDiagnosticClient().EndSourceFile();
   if (ShouldDumpIR)
     CG.GetModule()->print(llvm::outs(), nullptr);
   if (CI.getDiagnosticClient().getNumErrors())
     return llvm::make_error<llvm::StringError>(
         "Errors occurred while parsing the expression.", std::error_code());
   return std::move(CI);
 }
 
 void Forget(CIAndOrigins &CI, llvm::MutableArrayRef<CIAndOrigins> Imports) {
   llvm::SmallVector<ExternalASTMerger::ImporterSource, 3> Sources;
   for (CIAndOrigins &Import : Imports)
     Sources.push_back({Import.getASTContext(), Import.getFileManager(),
                        Import.getOriginMap()});
   ExternalASTSource *Source = CI.CI->getASTContext().getExternalSource();
   auto *Merger = static_cast<ExternalASTMerger *>(Source);
   Merger->RemoveSources(Sources);
 }
 
 } // end namespace
 
 int main(int argc, const char **argv) {
   const bool DisableCrashReporting = true;
   llvm::sys::PrintStackTraceOnErrorSignal(argv[0], DisableCrashReporting);
   llvm::cl::ParseCommandLineOptions(argc, argv);
   std::vector<CIAndOrigins> ImportCIs;
   for (auto I : Imports) {
     llvm::Expected<CIAndOrigins> ImportCI = Parse(I, {}, false, false);
     if (auto E = ImportCI.takeError()) {
       llvm::errs() << llvm::toString(std::move(E));
       exit(-1);
     }
     ImportCIs.push_back(std::move(*ImportCI));
   }
   std::vector<CIAndOrigins> IndirectCIs;
   if (!Direct || UseOrigins) {
     for (auto &ImportCI : ImportCIs) {
       CIAndOrigins IndirectCI = BuildIndirect(ImportCI);
       IndirectCIs.push_back(std::move(IndirectCI));
     }
   }
   if (UseOrigins)
     for (auto &ImportCI : ImportCIs)
       IndirectCIs.push_back(std::move(ImportCI));
   llvm::Expected<CIAndOrigins> ExpressionCI =
       Parse(Expression, (Direct && !UseOrigins) ? ImportCIs : IndirectCIs,
             DumpAST, DumpIR);
   if (auto E = ExpressionCI.takeError()) {
     llvm::errs() << llvm::toString(std::move(E));
     exit(-1);
   }
   Forget(*ExpressionCI, (Direct && !UseOrigins) ? ImportCIs : IndirectCIs);
   return 0;
 }
diff --git a/clang/tools/driver/cc1_main.cpp b/clang/tools/driver/cc1_main.cpp
index d160b64f9787..29767b880b62 100644
--- a/clang/tools/driver/cc1_main.cpp
+++ b/clang/tools/driver/cc1_main.cpp
@@ -1,290 +1,290 @@
 //===-- cc1_main.cpp - Clang CC1 Compiler Frontend ------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This is the entry point to the clang -cc1 functionality, which implements the
 // core compiler functionality along with a number of additional tools for
 // demonstration and testing purposes.
 //
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/Stack.h"
 #include "clang/Basic/TargetOptions.h"
 #include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
 #include "clang/Config/config.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "clang/Frontend/TextDiagnosticBuffer.h"
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/FrontendTool/Utils.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/LinkAllPasses.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/OptTable.h"
 #include "llvm/Support/BuryPointer.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include <cstdio>
 
 #ifdef CLANG_HAVE_RLIMITS
 #include <sys/resource.h>
 #endif
 
 using namespace clang;
 using namespace llvm::opt;
 
 //===----------------------------------------------------------------------===//
 // Main driver
 //===----------------------------------------------------------------------===//
 
 static void LLVMErrorHandler(void *UserData, const std::string &Message,
                              bool GenCrashDiag) {
   DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
 
   Diags.Report(diag::err_fe_error_backend) << Message;
 
   // Run the interrupt handlers to make sure any special cleanups get done, in
   // particular that we remove files registered with RemoveFileOnSignal.
   llvm::sys::RunInterruptHandlers();
 
   // We cannot recover from llvm errors.  When reporting a fatal error, exit
   // with status 70 to generate crash diagnostics.  For BSD systems this is
   // defined as an internal software error.  Otherwise, exit with status 1.
   exit(GenCrashDiag ? 70 : 1);
 }
 
 #ifdef LINK_POLLY_INTO_TOOLS
 namespace polly {
 void initializePollyPasses(llvm::PassRegistry &Registry);
 }
 #endif
 
 #ifdef CLANG_HAVE_RLIMITS
 #if defined(__linux__) && defined(__PIE__)
 static size_t getCurrentStackAllocation() {
   // If we can't compute the current stack usage, allow for 512K of command
   // line arguments and environment.
   size_t Usage = 512 * 1024;
   if (FILE *StatFile = fopen("/proc/self/stat", "r")) {
     // We assume that the stack extends from its current address to the end of
     // the environment space. In reality, there is another string literal (the
     // program name) after the environment, but this is close enough (we only
     // need to be within 100K or so).
     unsigned long StackPtr, EnvEnd;
     // Disable silly GCC -Wformat warning that complains about length
     // modifiers on ignored format specifiers. We want to retain these
     // for documentation purposes even though they have no effect.
 #if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wformat"
 #endif
     if (fscanf(StatFile,
                "%*d %*s %*c %*d %*d %*d %*d %*d %*u %*lu %*lu %*lu %*lu %*lu "
                "%*lu %*ld %*ld %*ld %*ld %*ld %*ld %*llu %*lu %*ld %*lu %*lu "
                "%*lu %*lu %lu %*lu %*lu %*lu %*lu %*lu %*llu %*lu %*lu %*d %*d "
                "%*u %*u %*llu %*lu %*ld %*lu %*lu %*lu %*lu %*lu %*lu %lu %*d",
                &StackPtr, &EnvEnd) == 2) {
 #if defined(__GNUC__) && !defined(__clang__)
 #pragma GCC diagnostic pop
 #endif
       Usage = StackPtr < EnvEnd ? EnvEnd - StackPtr : StackPtr - EnvEnd;
     }
     fclose(StatFile);
   }
   return Usage;
 }
 
 #include <alloca.h>
 
 LLVM_ATTRIBUTE_NOINLINE
 static void ensureStackAddressSpace() {
   // Linux kernels prior to 4.1 will sometimes locate the heap of a PIE binary
   // relatively close to the stack (they are only guaranteed to be 128MiB
   // apart). This results in crashes if we happen to heap-allocate more than
   // 128MiB before we reach our stack high-water mark.
   //
   // To avoid these crashes, ensure that we have sufficient virtual memory
   // pages allocated before we start running.
   size_t Curr = getCurrentStackAllocation();
   const int kTargetStack = DesiredStackSize - 256 * 1024;
   if (Curr < kTargetStack) {
     volatile char *volatile Alloc =
         static_cast<volatile char *>(alloca(kTargetStack - Curr));
     Alloc[0] = 0;
     Alloc[kTargetStack - Curr - 1] = 0;
   }
 }
 #else
 static void ensureStackAddressSpace() {}
 #endif
 
 /// Attempt to ensure that we have at least 8MiB of usable stack space.
 static void ensureSufficientStack() {
   struct rlimit rlim;
   if (getrlimit(RLIMIT_STACK, &rlim) != 0)
     return;
 
   // Increase the soft stack limit to our desired level, if necessary and
   // possible.
   if (rlim.rlim_cur != RLIM_INFINITY &&
       rlim.rlim_cur < rlim_t(DesiredStackSize)) {
     // Try to allocate sufficient stack.
     if (rlim.rlim_max == RLIM_INFINITY ||
         rlim.rlim_max >= rlim_t(DesiredStackSize))
       rlim.rlim_cur = DesiredStackSize;
     else if (rlim.rlim_cur == rlim.rlim_max)
       return;
     else
       rlim.rlim_cur = rlim.rlim_max;
 
     if (setrlimit(RLIMIT_STACK, &rlim) != 0 ||
         rlim.rlim_cur != DesiredStackSize)
       return;
   }
 
   // We should now have a stack of size at least DesiredStackSize. Ensure
   // that we can actually use that much, if necessary.
   ensureStackAddressSpace();
 }
 #else
 static void ensureSufficientStack() {}
 #endif
 
 /// Print supported cpus of the given target.
 static int PrintSupportedCPUs(std::string TargetStr) {
   std::string Error;
   const llvm::Target *TheTarget =
       llvm::TargetRegistry::lookupTarget(TargetStr, Error);
   if (!TheTarget) {
     llvm::errs() << Error;
     return 1;
   }
 
   // the target machine will handle the mcpu printing
   llvm::TargetOptions Options;
   std::unique_ptr<llvm::TargetMachine> TheTargetMachine(
       TheTarget->createTargetMachine(TargetStr, "", "+cpuHelp", Options, None));
   return 0;
 }
 
 int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
   ensureSufficientStack();
 
   std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 
   // Register the support for object-file-wrapped Clang modules.
   auto PCHOps = Clang->getPCHContainerOperations();
   PCHOps->registerWriter(std::make_unique<ObjectFilePCHContainerWriter>());
   PCHOps->registerReader(std::make_unique<ObjectFilePCHContainerReader>());
 
   // Initialize targets first, so that --version shows registered targets.
   llvm::InitializeAllTargets();
   llvm::InitializeAllTargetMCs();
   llvm::InitializeAllAsmPrinters();
   llvm::InitializeAllAsmParsers();
 
 #ifdef LINK_POLLY_INTO_TOOLS
   llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
   polly::initializePollyPasses(Registry);
 #endif
 
   // Buffer diagnostics from argument parsing so that we can output them using a
   // well formed diagnostic object.
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
   DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
-  bool Success = CompilerInvocation::CreateFromArgs(
-      Clang->getInvocation(), Argv.begin(), Argv.end(), Diags);
+  bool Success =
+      CompilerInvocation::CreateFromArgs(Clang->getInvocation(), Argv, Diags);
 
   if (Clang->getFrontendOpts().TimeTrace) {
     llvm::timeTraceProfilerInitialize(
         Clang->getFrontendOpts().TimeTraceGranularity);
   }
   // --print-supported-cpus takes priority over the actual compilation.
   if (Clang->getFrontendOpts().PrintSupportedCPUs)
     return PrintSupportedCPUs(Clang->getTargetOpts().Triple);
 
   // Infer the builtin include path if unspecified.
   if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
       Clang->getHeaderSearchOpts().ResourceDir.empty())
     Clang->getHeaderSearchOpts().ResourceDir =
       CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
 
   // Create the actual diagnostics engine.
   Clang->createDiagnostics();
   if (!Clang->hasDiagnostics())
     return 1;
 
   // Set an error handler, so that any LLVM backend diagnostics go through our
   // error handler.
   llvm::install_fatal_error_handler(LLVMErrorHandler,
                                   static_cast<void*>(&Clang->getDiagnostics()));
 
   DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
   if (!Success)
     return 1;
 
   // Execute the frontend actions.
   {
     llvm::TimeTraceScope TimeScope("ExecuteCompiler", StringRef(""));
     Success = ExecuteCompilerInvocation(Clang.get());
   }
 
   // If any timers were active but haven't been destroyed yet, print their
   // results now.  This happens in -disable-free mode.
   llvm::TimerGroup::printAll(llvm::errs());
 
   if (llvm::timeTraceProfilerEnabled()) {
     SmallString<128> Path(Clang->getFrontendOpts().OutputFile);
     llvm::sys::path::replace_extension(Path, "json");
     auto profilerOutput =
         Clang->createOutputFile(Path.str(),
                                 /*Binary=*/false,
                                 /*RemoveFileOnSignal=*/false, "",
                                 /*Extension=*/"json",
                                 /*useTemporary=*/false);
 
     llvm::timeTraceProfilerWrite(*profilerOutput);
     // FIXME(ibiryukov): make profilerOutput flush in destructor instead.
     profilerOutput->flush();
     llvm::timeTraceProfilerCleanup();
 
     llvm::errs() << "Time trace json-file dumped to " << Path.str() << "\n";
     llvm::errs()
         << "Use chrome://tracing or Speedscope App "
            "(https://www.speedscope.app) for flamegraph visualization\n";
   }
 
   // Our error handler depends on the Diagnostics object, which we're
   // potentially about to delete. Uninstall the handler now so that any
   // later errors use the default handling behavior instead.
   llvm::remove_fatal_error_handler();
 
   // When running with -disable-free, don't do any destruction or shutdown.
   if (Clang->getFrontendOpts().DisableFree) {
     llvm::BuryPointer(std::move(Clang));
     return !Success;
   }
 
   return !Success;
 }
diff --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index ba8a8cd37667..8b70be664e04 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -1,83 +1,82 @@
 //===- unittest/AST/ExternalASTSourceTest.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
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains tests for Clang's ExternalASTSource.
 //
 //===----------------------------------------------------------------------===//
 
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/ExternalASTSource.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "gtest/gtest.h"
 
 using namespace clang;
 using namespace llvm;
 
 
 class TestFrontendAction : public ASTFrontendAction {
 public:
   TestFrontendAction(ExternalASTSource *Source) : Source(Source) {}
 
 private:
   void ExecuteAction() override {
     getCompilerInstance().getASTContext().setExternalSource(Source);
     getCompilerInstance().getASTContext().getTranslationUnitDecl()
         ->setHasExternalVisibleStorage();
     return ASTFrontendAction::ExecuteAction();
   }
 
   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) override {
     return std::make_unique<ASTConsumer>();
   }
 
   IntrusiveRefCntPtr<ExternalASTSource> Source;
 };
 
 bool testExternalASTSource(ExternalASTSource *Source,
                            StringRef FileContents) {
   CompilerInstance Compiler;
   Compiler.createDiagnostics();
 
   auto Invocation = std::make_shared<CompilerInvocation>();
   Invocation->getPreprocessorOpts().addRemappedFile(
       "test.cc", MemoryBuffer::getMemBuffer(FileContents).release());
   const char *Args[] = { "test.cc" };
   CompilerInvocation::CreateFromArgs(*Invocation, Args,
-                                     Args + array_lengthof(Args),
                                      Compiler.getDiagnostics());
   Compiler.setInvocation(std::move(Invocation));
 
   TestFrontendAction Action(Source);
   return Compiler.ExecuteAction(Action);
 }
 
 
 // Ensure that a failed name lookup into an external source only occurs once.
 TEST(ExternalASTSourceTest, FailedLookupOccursOnce) {
   struct TestSource : ExternalASTSource {
     TestSource(unsigned &Calls) : Calls(Calls) {}
 
     bool FindExternalVisibleDeclsByName(const DeclContext *,
                                         DeclarationName Name) override {
       if (Name.getAsString() == "j")
         ++Calls;
       return false;
     }
 
     unsigned &Calls;
   };
 
   unsigned Calls = 0;
   ASSERT_TRUE(testExternalASTSource(new TestSource(Calls), "int j, k = j;"));
   EXPECT_EQ(1u, Calls);
 }