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 //===- ToolChain.h - Collections of tools for one platform ------*- 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_DRIVER_TOOLCHAIN_H
 #define LLVM_CLANG_DRIVER_TOOLCHAIN_H
 
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/Sanitizers.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Multilib.h"
 #include "clang/Driver/Types.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/FloatingPointMode.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Frontend/Debug/Options.h"
 #include "llvm/MC/MCTargetOptions.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/VersionTuple.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/TargetParser/Triple.h"
 #include <cassert>
 #include <climits>
 #include <memory>
 #include <optional>
 #include <string>
 #include <utility>
 
 namespace llvm {
 namespace opt {
 
 class Arg;
 class ArgList;
 class DerivedArgList;
 
 } // namespace opt
 namespace vfs {
 
 class FileSystem;
 
 } // namespace vfs
 } // namespace llvm
 
 namespace clang {
 
 class ObjCRuntime;
 
 namespace driver {
 
 class Driver;
 class InputInfo;
 class SanitizerArgs;
 class Tool;
 class XRayArgs;
 
 /// Helper structure used to pass information extracted from clang executable
 /// name such as `i686-linux-android-g++`.
 struct ParsedClangName {
   /// Target part of the executable name, as `i686-linux-android`.
   std::string TargetPrefix;
 
   /// Driver mode part of the executable name, as `g++`.
   std::string ModeSuffix;
 
   /// Corresponding driver mode argument, as '--driver-mode=g++'
   const char *DriverMode = nullptr;
 
   /// True if TargetPrefix is recognized as a registered target name.
   bool TargetIsValid = false;
 
   ParsedClangName() = default;
   ParsedClangName(std::string Suffix, const char *Mode)
       : ModeSuffix(Suffix), DriverMode(Mode) {}
   ParsedClangName(std::string Target, std::string Suffix, const char *Mode,
                   bool IsRegistered)
       : TargetPrefix(Target), ModeSuffix(Suffix), DriverMode(Mode),
         TargetIsValid(IsRegistered) {}
 
   bool isEmpty() const {
     return TargetPrefix.empty() && ModeSuffix.empty() && DriverMode == nullptr;
   }
 };
 
 /// ToolChain - Access to tools for a single platform.
 class ToolChain {
 public:
   using path_list = SmallVector<std::string, 16>;
 
   enum CXXStdlibType {
     CST_Libcxx,
     CST_Libstdcxx
   };
 
   enum RuntimeLibType {
     RLT_CompilerRT,
     RLT_Libgcc
   };
 
   enum UnwindLibType {
     UNW_None,
     UNW_CompilerRT,
     UNW_Libgcc
   };
 
   enum class UnwindTableLevel {
     None,
     Synchronous,
     Asynchronous,
   };
 
   enum RTTIMode {
     RM_Enabled,
     RM_Disabled,
   };
 
   enum ExceptionsMode {
     EM_Enabled,
     EM_Disabled,
   };
 
   struct BitCodeLibraryInfo {
     std::string Path;
     bool ShouldInternalize;
     BitCodeLibraryInfo(StringRef Path, bool ShouldInternalize = true)
         : Path(Path), ShouldInternalize(ShouldInternalize) {}
   };
 
   enum FileType { FT_Object, FT_Static, FT_Shared };
 
 private:
   friend class RegisterEffectiveTriple;
 
   const Driver &D;
   llvm::Triple Triple;
   const llvm::opt::ArgList &Args;
 
   // We need to initialize CachedRTTIArg before CachedRTTIMode
   const llvm::opt::Arg *const CachedRTTIArg;
 
   const RTTIMode CachedRTTIMode;
 
   const ExceptionsMode CachedExceptionsMode;
 
   /// The list of toolchain specific path prefixes to search for libraries.
   path_list LibraryPaths;
 
   /// The list of toolchain specific path prefixes to search for files.
   path_list FilePaths;
 
   /// The list of toolchain specific path prefixes to search for programs.
   path_list ProgramPaths;
 
   mutable std::unique_ptr<Tool> Clang;
   mutable std::unique_ptr<Tool> Flang;
   mutable std::unique_ptr<Tool> Assemble;
   mutable std::unique_ptr<Tool> Link;
   mutable std::unique_ptr<Tool> StaticLibTool;
   mutable std::unique_ptr<Tool> IfsMerge;
   mutable std::unique_ptr<Tool> OffloadBundler;
   mutable std::unique_ptr<Tool> OffloadPackager;
   mutable std::unique_ptr<Tool> LinkerWrapper;
 
   Tool *getClang() const;
   Tool *getFlang() const;
   Tool *getAssemble() const;
   Tool *getLink() const;
   Tool *getStaticLibTool() const;
   Tool *getIfsMerge() const;
   Tool *getClangAs() const;
   Tool *getOffloadBundler() const;
   Tool *getOffloadPackager() const;
   Tool *getLinkerWrapper() const;
 
   mutable bool SanitizerArgsChecked = false;
   mutable std::unique_ptr<XRayArgs> XRayArguments;
 
   /// The effective clang triple for the current Job.
   mutable llvm::Triple EffectiveTriple;
 
   /// Set the toolchain's effective clang triple.
   void setEffectiveTriple(llvm::Triple ET) const {
     EffectiveTriple = std::move(ET);
   }
 
   std::optional<std::string>
   getFallbackAndroidTargetPath(StringRef BaseDir) const;
 
   mutable std::optional<CXXStdlibType> cxxStdlibType;
   mutable std::optional<RuntimeLibType> runtimeLibType;
   mutable std::optional<UnwindLibType> unwindLibType;
 
 protected:
   MultilibSet Multilibs;
   llvm::SmallVector<Multilib> SelectedMultilibs;
 
   ToolChain(const Driver &D, const llvm::Triple &T,
             const llvm::opt::ArgList &Args);
 
   /// Executes the given \p Executable and returns the stdout.
   llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
   executeToolChainProgram(StringRef Executable) const;
 
   void setTripleEnvironment(llvm::Triple::EnvironmentType Env);
 
   virtual Tool *buildAssembler() const;
   virtual Tool *buildLinker() const;
   virtual Tool *buildStaticLibTool() const;
   virtual Tool *getTool(Action::ActionClass AC) const;
 
   virtual std::string buildCompilerRTBasename(const llvm::opt::ArgList &Args,
                                               StringRef Component,
                                               FileType Type,
                                               bool AddArch) const;
 
   /// Find the target-specific subdirectory for the current target triple under
   /// \p BaseDir, doing fallback triple searches as necessary.
   /// \return The subdirectory path if it exists.
   std::optional<std::string> getTargetSubDirPath(StringRef BaseDir) const;
 
   /// \name Utilities for implementing subclasses.
   ///@{
   static void addSystemInclude(const llvm::opt::ArgList &DriverArgs,
                                llvm::opt::ArgStringList &CC1Args,
                                const Twine &Path);
   static void addExternCSystemInclude(const llvm::opt::ArgList &DriverArgs,
                                       llvm::opt::ArgStringList &CC1Args,
                                       const Twine &Path);
   static void
       addExternCSystemIncludeIfExists(const llvm::opt::ArgList &DriverArgs,
                                       llvm::opt::ArgStringList &CC1Args,
                                       const Twine &Path);
   static void addSystemIncludes(const llvm::opt::ArgList &DriverArgs,
                                 llvm::opt::ArgStringList &CC1Args,
                                 ArrayRef<StringRef> Paths);
 
   static std::string concat(StringRef Path, const Twine &A, const Twine &B = "",
                             const Twine &C = "", const Twine &D = "");
   ///@}
 
 public:
   virtual ~ToolChain();
 
   // Accessors
 
   const Driver &getDriver() const { return D; }
   llvm::vfs::FileSystem &getVFS() const;
   const llvm::Triple &getTriple() const { return Triple; }
 
   /// Get the toolchain's aux triple, if it has one.
   ///
   /// Exactly what the aux triple represents depends on the toolchain, but for
   /// example when compiling CUDA code for the GPU, the triple might be NVPTX,
   /// while the aux triple is the host (CPU) toolchain, e.g. x86-linux-gnu.
   virtual const llvm::Triple *getAuxTriple() const { return nullptr; }
 
   /// Some toolchains need to modify the file name, for example to replace the
   /// extension for object files with .cubin for OpenMP offloading to Nvidia
   /// GPUs.
   virtual std::string getInputFilename(const InputInfo &Input) const;
 
   llvm::Triple::ArchType getArch() const { return Triple.getArch(); }
   StringRef getArchName() const { return Triple.getArchName(); }
   StringRef getPlatform() const { return Triple.getVendorName(); }
   StringRef getOS() const { return Triple.getOSName(); }
 
   /// Provide the default architecture name (as expected by -arch) for
   /// this toolchain.
   StringRef getDefaultUniversalArchName() const;
 
   std::string getTripleString() const {
     return Triple.getTriple();
   }
 
   /// Get the toolchain's effective clang triple.
   const llvm::Triple &getEffectiveTriple() const {
     assert(!EffectiveTriple.getTriple().empty() && "No effective triple");
     return EffectiveTriple;
   }
 
   bool hasEffectiveTriple() const {
     return !EffectiveTriple.getTriple().empty();
   }
 
   path_list &getLibraryPaths() { return LibraryPaths; }
   const path_list &getLibraryPaths() const { return LibraryPaths; }
 
   path_list &getFilePaths() { return FilePaths; }
   const path_list &getFilePaths() const { return FilePaths; }
 
   path_list &getProgramPaths() { return ProgramPaths; }
   const path_list &getProgramPaths() const { return ProgramPaths; }
 
   const MultilibSet &getMultilibs() const { return Multilibs; }
 
   const llvm::SmallVector<Multilib> &getSelectedMultilibs() const {
     return SelectedMultilibs;
   }
 
   /// Get flags suitable for multilib selection, based on the provided clang
   /// command line arguments. The command line arguments aren't suitable to be
   /// used directly for multilib selection because they are not normalized and
   /// normalization is a complex process. The result of this function is similar
   /// to clang command line arguments except that the list of arguments is
   /// incomplete. Only certain command line arguments are processed. If more
   /// command line arguments are needed for multilib selection then this
   /// function should be extended.
   /// To allow users to find out what flags are returned, clang accepts a
   /// -print-multi-flags-experimental argument.
   Multilib::flags_list getMultilibFlags(const llvm::opt::ArgList &) const;
 
   SanitizerArgs getSanitizerArgs(const llvm::opt::ArgList &JobArgs) const;
 
   const XRayArgs& getXRayArgs() const;
 
   // Returns the Arg * that explicitly turned on/off rtti, or nullptr.
   const llvm::opt::Arg *getRTTIArg() const { return CachedRTTIArg; }
 
   // Returns the RTTIMode for the toolchain with the current arguments.
   RTTIMode getRTTIMode() const { return CachedRTTIMode; }
 
   // Returns the ExceptionsMode for the toolchain with the current arguments.
   ExceptionsMode getExceptionsMode() const { return CachedExceptionsMode; }
 
   /// Return any implicit target and/or mode flag for an invocation of
   /// the compiler driver as `ProgName`.
   ///
   /// For example, when called with i686-linux-android-g++, the first element
   /// of the return value will be set to `"i686-linux-android"` and the second
   /// will be set to "--driver-mode=g++"`.
   /// It is OK if the target name is not registered. In this case the return
   /// value contains false in the field TargetIsValid.
   ///
   /// \pre `llvm::InitializeAllTargets()` has been called.
   /// \param ProgName The name the Clang driver was invoked with (from,
   /// e.g., argv[0]).
   /// \return A structure of type ParsedClangName that contains the executable
   /// name parts.
   static ParsedClangName getTargetAndModeFromProgramName(StringRef ProgName);
 
   // Tool access.
 
   /// TranslateArgs - Create a new derived argument list for any argument
   /// translations this ToolChain may wish to perform, or 0 if no tool chain
   /// specific translations are needed. If \p DeviceOffloadKind is specified
   /// the translation specific for that offload kind is performed.
   ///
   /// \param BoundArch - The bound architecture name, or 0.
   /// \param DeviceOffloadKind - The device offload kind used for the
   /// translation.
   virtual llvm::opt::DerivedArgList *
   TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
                 Action::OffloadKind DeviceOffloadKind) const {
     return nullptr;
   }
 
   /// TranslateOpenMPTargetArgs - Create a new derived argument list for
   /// that contains the OpenMP target specific flags passed via
   /// -Xopenmp-target -opt=val OR -Xopenmp-target=<triple> -opt=val
   virtual llvm::opt::DerivedArgList *TranslateOpenMPTargetArgs(
       const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost,
       SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const;
 
   /// Append the argument following \p A to \p DAL assuming \p A is an Xarch
   /// argument. If \p AllocatedArgs is null pointer, synthesized arguments are
   /// added to \p DAL, otherwise they are appended to \p AllocatedArgs.
   virtual void TranslateXarchArgs(
       const llvm::opt::DerivedArgList &Args, llvm::opt::Arg *&A,
       llvm::opt::DerivedArgList *DAL,
       SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs = nullptr) const;
 
   /// Translate -Xarch_ arguments. If there are no such arguments, return
   /// a null pointer, otherwise return a DerivedArgList containing the
   /// translated arguments.
   virtual llvm::opt::DerivedArgList *
   TranslateXarchArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
                      Action::OffloadKind DeviceOffloadKind,
                      SmallVectorImpl<llvm::opt::Arg *> *AllocatedArgs) const;
 
   /// Choose a tool to use to handle the action \p JA.
   ///
   /// This can be overridden when a particular ToolChain needs to use
   /// a compiler other than Clang.
   virtual Tool *SelectTool(const JobAction &JA) const;
 
   // Helper methods
 
   std::string GetFilePath(const char *Name) const;
   std::string GetProgramPath(const char *Name) const;
 
   /// Returns the linker path, respecting the -fuse-ld= argument to determine
   /// the linker suffix or name.
   /// If LinkerIsLLD is non-nullptr, it is set to true if the returned linker
   /// is LLD. If it's set, it can be assumed that the linker is LLD built
   /// at the same revision as clang, and clang can make assumptions about
   /// LLD's supported flags, error output, etc.
   std::string GetLinkerPath(bool *LinkerIsLLD = nullptr) const;
 
   /// Returns the linker path for emitting a static library.
   std::string GetStaticLibToolPath() const;
 
   /// Dispatch to the specific toolchain for verbose printing.
   ///
   /// This is used when handling the verbose option to print detailed,
   /// toolchain-specific information useful for understanding the behavior of
   /// the driver on a specific platform.
   virtual void printVerboseInfo(raw_ostream &OS) const {}
 
   // Platform defaults information
 
   /// Returns true if the toolchain is targeting a non-native
   /// architecture.
   virtual bool isCrossCompiling() const;
 
   /// HasNativeLTOLinker - Check whether the linker and related tools have
   /// native LLVM support.
   virtual bool HasNativeLLVMSupport() const;
 
   /// LookupTypeForExtension - Return the default language type to use for the
   /// given extension.
   virtual types::ID LookupTypeForExtension(StringRef Ext) const;
 
   /// IsBlocksDefault - Does this tool chain enable -fblocks by default.
   virtual bool IsBlocksDefault() const { return false; }
 
   /// IsIntegratedAssemblerDefault - Does this tool chain enable -integrated-as
   /// by default.
   virtual bool IsIntegratedAssemblerDefault() const { return true; }
 
   /// IsIntegratedBackendDefault - Does this tool chain enable
   /// -fintegrated-objemitter by default.
   virtual bool IsIntegratedBackendDefault() const { return true; }
 
   /// IsIntegratedBackendSupported - Does this tool chain support
   /// -fintegrated-objemitter.
   virtual bool IsIntegratedBackendSupported() const { return true; }
 
   /// IsNonIntegratedBackendSupported - Does this tool chain support
   /// -fno-integrated-objemitter.
   virtual bool IsNonIntegratedBackendSupported() const { return false; }
 
   /// Check if the toolchain should use the integrated assembler.
   virtual bool useIntegratedAs() const;
 
   /// Check if the toolchain should use the integrated backend.
   virtual bool useIntegratedBackend() const;
 
   /// Check if the toolchain should use AsmParser to parse inlineAsm when
   /// integrated assembler is not default.
   virtual bool parseInlineAsmUsingAsmParser() const { return false; }
 
   /// IsMathErrnoDefault - Does this tool chain use -fmath-errno by default.
   virtual bool IsMathErrnoDefault() const { return true; }
 
   /// IsEncodeExtendedBlockSignatureDefault - Does this tool chain enable
   /// -fencode-extended-block-signature by default.
   virtual bool IsEncodeExtendedBlockSignatureDefault() const { return false; }
 
   /// IsObjCNonFragileABIDefault - Does this tool chain set
   /// -fobjc-nonfragile-abi by default.
   virtual bool IsObjCNonFragileABIDefault() const { return false; }
 
   /// UseObjCMixedDispatchDefault - When using non-legacy dispatch, should the
   /// mixed dispatch method be used?
   virtual bool UseObjCMixedDispatch() const { return false; }
 
   /// Check whether to enable x86 relax relocations by default.
   virtual bool useRelaxRelocations() const;
 
   /// Check whether use IEEE binary128 as long double format by default.
   bool defaultToIEEELongDouble() const;
 
   /// GetDefaultStackProtectorLevel - Get the default stack protector level for
   /// this tool chain.
   virtual LangOptions::StackProtectorMode
   GetDefaultStackProtectorLevel(bool KernelOrKext) const {
     return LangOptions::SSPOff;
   }
 
   /// Get the default trivial automatic variable initialization.
   virtual LangOptions::TrivialAutoVarInitKind
   GetDefaultTrivialAutoVarInit() const {
     return LangOptions::TrivialAutoVarInitKind::Uninitialized;
   }
 
   /// GetDefaultLinker - Get the default linker to use.
   virtual const char *getDefaultLinker() const { return "ld"; }
 
   /// GetDefaultRuntimeLibType - Get the default runtime library variant to use.
   virtual RuntimeLibType GetDefaultRuntimeLibType() const {
     return ToolChain::RLT_Libgcc;
   }
 
   virtual CXXStdlibType GetDefaultCXXStdlibType() const {
     return ToolChain::CST_Libstdcxx;
   }
 
   virtual UnwindLibType GetDefaultUnwindLibType() const {
     return ToolChain::UNW_None;
   }
 
   virtual std::string getCompilerRTPath() const;
 
   virtual std::string getCompilerRT(const llvm::opt::ArgList &Args,
                                     StringRef Component,
                                     FileType Type = ToolChain::FT_Static) const;
 
   const char *
   getCompilerRTArgString(const llvm::opt::ArgList &Args, StringRef Component,
                          FileType Type = ToolChain::FT_Static) const;
 
   std::string getCompilerRTBasename(const llvm::opt::ArgList &Args,
                                     StringRef Component,
                                     FileType Type = ToolChain::FT_Static) const;
 
   // Returns the target specific runtime path if it exists.
   std::optional<std::string> getRuntimePath() const;
 
   // Returns target specific standard library path if it exists.
   std::optional<std::string> getStdlibPath() const;
 
   // Returns target specific standard library include path if it exists.
   std::optional<std::string> getStdlibIncludePath() const;
 
   // Returns <ResourceDir>/lib/<OSName>/<arch> or <ResourceDir>/lib/<triple>.
   // This is used by runtimes (such as OpenMP) to find arch-specific libraries.
   virtual path_list getArchSpecificLibPaths() const;
 
   // Returns <OSname> part of above.
   virtual StringRef getOSLibName() const;
 
   /// needsProfileRT - returns true if instrumentation profile is on.
   static bool needsProfileRT(const llvm::opt::ArgList &Args);
 
   /// Returns true if gcov instrumentation (-fprofile-arcs or --coverage) is on.
   static bool needsGCovInstrumentation(const llvm::opt::ArgList &Args);
 
   /// How detailed should the unwind tables be by default.
   virtual UnwindTableLevel
   getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const;
 
   /// Test whether this toolchain supports outline atomics by default.
   virtual bool
   IsAArch64OutlineAtomicsDefault(const llvm::opt::ArgList &Args) const {
     return false;
   }
 
   /// Test whether this toolchain defaults to PIC.
   virtual bool isPICDefault() const = 0;
 
   /// Test whether this toolchain defaults to PIE.
   virtual bool isPIEDefault(const llvm::opt::ArgList &Args) const = 0;
 
   /// Tests whether this toolchain forces its default for PIC, PIE or
   /// non-PIC.  If this returns true, any PIC related flags should be ignored
   /// and instead the results of \c isPICDefault() and \c isPIEDefault(const
   /// llvm::opt::ArgList &Args) are used exclusively.
   virtual bool isPICDefaultForced() const = 0;
 
   /// SupportsProfiling - Does this tool chain support -pg.
   virtual bool SupportsProfiling() const { return true; }
 
   /// Complain if this tool chain doesn't support Objective-C ARC.
   virtual void CheckObjCARC() const {}
 
   /// Get the default debug info format. Typically, this is DWARF.
   virtual llvm::codegenoptions::DebugInfoFormat getDefaultDebugFormat() const {
     return llvm::codegenoptions::DIF_DWARF;
   }
 
   /// UseDwarfDebugFlags - Embed the compile options to clang into the Dwarf
   /// compile unit information.
   virtual bool UseDwarfDebugFlags() const { return false; }
 
   /// Add an additional -fdebug-prefix-map entry.
   virtual std::string GetGlobalDebugPathRemapping() const { return {}; }
 
   // Return the DWARF version to emit, in the absence of arguments
   // to the contrary.
   virtual unsigned GetDefaultDwarfVersion() const { return 5; }
 
   // Some toolchains may have different restrictions on the DWARF version and
   // may need to adjust it. E.g. NVPTX may need to enforce DWARF2 even when host
   // compilation uses DWARF5.
   virtual unsigned getMaxDwarfVersion() const { return UINT_MAX; }
 
   // True if the driver should assume "-fstandalone-debug"
   // in the absence of an option specifying otherwise,
   // provided that debugging was requested in the first place.
   // i.e. a value of 'true' does not imply that debugging is wanted.
   virtual bool GetDefaultStandaloneDebug() const { return false; }
 
   // Return the default debugger "tuning."
   virtual llvm::DebuggerKind getDefaultDebuggerTuning() const {
     return llvm::DebuggerKind::GDB;
   }
 
   /// Does this toolchain supports given debug info option or not.
   virtual bool supportsDebugInfoOption(const llvm::opt::Arg *) const {
     return true;
   }
 
   /// Adjust debug information kind considering all passed options.
   virtual void
   adjustDebugInfoKind(llvm::codegenoptions::DebugInfoKind &DebugInfoKind,
                       const llvm::opt::ArgList &Args) const {}
 
   /// GetExceptionModel - Return the tool chain exception model.
   virtual llvm::ExceptionHandling
   GetExceptionModel(const llvm::opt::ArgList &Args) const;
 
   /// SupportsEmbeddedBitcode - Does this tool chain support embedded bitcode.
   virtual bool SupportsEmbeddedBitcode() const { return false; }
 
   /// getThreadModel() - Which thread model does this target use?
   virtual std::string getThreadModel() const { return "posix"; }
 
   /// isThreadModelSupported() - Does this target support a thread model?
   virtual bool isThreadModelSupported(const StringRef Model) const;
 
   /// isBareMetal - Is this a bare metal target.
   virtual bool isBareMetal() const { return false; }
 
   virtual std::string getMultiarchTriple(const Driver &D,
                                          const llvm::Triple &TargetTriple,
                                          StringRef SysRoot) const {
     return TargetTriple.str();
   }
 
   /// ComputeLLVMTriple - Return the LLVM target triple to use, after taking
   /// command line arguments into account.
   virtual std::string
   ComputeLLVMTriple(const llvm::opt::ArgList &Args,
                     types::ID InputType = types::TY_INVALID) const;
 
   /// ComputeEffectiveClangTriple - Return the Clang triple to use for this
   /// target, which may take into account the command line arguments. For
   /// example, on Darwin the -mmacos-version-min= command line argument (which
   /// sets the deployment target) determines the version in the triple passed to
   /// Clang.
   virtual std::string ComputeEffectiveClangTriple(
       const llvm::opt::ArgList &Args,
       types::ID InputType = types::TY_INVALID) const;
 
   /// getDefaultObjCRuntime - Return the default Objective-C runtime
   /// for this platform.
   ///
   /// FIXME: this really belongs on some sort of DeploymentTarget abstraction
   virtual ObjCRuntime getDefaultObjCRuntime(bool isNonFragile) const;
 
   /// hasBlocksRuntime - Given that the user is compiling with
   /// -fblocks, does this tool chain guarantee the existence of a
   /// blocks runtime?
   ///
   /// FIXME: this really belongs on some sort of DeploymentTarget abstraction
   virtual bool hasBlocksRuntime() const { return true; }
 
   /// Return the sysroot, possibly searching for a default sysroot using
   /// target-specific logic.
   virtual std::string computeSysRoot() const;
 
   /// Add the clang cc1 arguments for system include paths.
   ///
   /// This routine is responsible for adding the necessary cc1 arguments to
   /// include headers from standard system header directories.
   virtual void
   AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                             llvm::opt::ArgStringList &CC1Args) const;
 
   /// Add options that need to be passed to cc1 for this target.
   virtual void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
                                      llvm::opt::ArgStringList &CC1Args,
                                      Action::OffloadKind DeviceOffloadKind) const;
 
   /// Add options that need to be passed to cc1as for this target.
   virtual void
   addClangCC1ASTargetOptions(const llvm::opt::ArgList &Args,
                              llvm::opt::ArgStringList &CC1ASArgs) const;
 
   /// Add warning options that need to be passed to cc1 for this target.
   virtual void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const;
 
   // Get the list of extra macro defines requested by the multilib
   // configuration.
   virtual SmallVector<std::string>
   getMultilibMacroDefinesStr(llvm::opt::ArgList &Args) const {
     return {};
   };
 
   // GetRuntimeLibType - Determine the runtime library type to use with the
   // given compilation arguments.
   virtual RuntimeLibType
   GetRuntimeLibType(const llvm::opt::ArgList &Args) const;
 
   // GetCXXStdlibType - Determine the C++ standard library type to use with the
   // given compilation arguments.
   virtual CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const;
 
   // GetUnwindLibType - Determine the unwind library type to use with the
   // given compilation arguments.
   virtual UnwindLibType GetUnwindLibType(const llvm::opt::ArgList &Args) const;
 
   // Detect the highest available version of libc++ in include path.
   virtual std::string detectLibcxxVersion(StringRef IncludePath) const;
 
   /// AddClangCXXStdlibIncludeArgs - Add the clang -cc1 level arguments to set
   /// the include paths to use for the given C++ standard library type.
   virtual void
   AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                llvm::opt::ArgStringList &CC1Args) const;
 
   /// AddClangCXXStdlibIsystemArgs - Add the clang -cc1 level arguments to set
   /// the specified include paths for the C++ standard library.
   void AddClangCXXStdlibIsystemArgs(const llvm::opt::ArgList &DriverArgs,
                                     llvm::opt::ArgStringList &CC1Args) const;
 
   /// Returns if the C++ standard library should be linked in.
   /// Note that e.g. -lm should still be linked even if this returns false.
   bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const;
 
   /// AddCXXStdlibLibArgs - Add the system specific linker arguments to use
   /// for the given C++ standard library type.
   virtual void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
                                    llvm::opt::ArgStringList &CmdArgs) const;
 
   /// AddFilePathLibArgs - Add each thing in getFilePaths() as a "-L" option.
   void AddFilePathLibArgs(const llvm::opt::ArgList &Args,
                           llvm::opt::ArgStringList &CmdArgs) const;
 
   /// AddCCKextLibArgs - Add the system specific linker arguments to use
   /// for kernel extensions (Darwin-specific).
   virtual void AddCCKextLibArgs(const llvm::opt::ArgList &Args,
                                 llvm::opt::ArgStringList &CmdArgs) const;
 
   /// If a runtime library exists that sets global flags for unsafe floating
   /// point math, return true.
   ///
   /// This checks for presence of the -Ofast, -ffast-math or -funsafe-math flags.
   virtual bool isFastMathRuntimeAvailable(
     const llvm::opt::ArgList &Args, std::string &Path) const;
 
   /// AddFastMathRuntimeIfAvailable - If a runtime library exists that sets
   /// global flags for unsafe floating point math, add it and return true.
   ///
   /// This checks for presence of the -Ofast, -ffast-math or -funsafe-math flags.
   bool addFastMathRuntimeIfAvailable(
     const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const;
 
   /// getSystemGPUArchs - Use a tool to detect the user's availible GPUs.
   virtual Expected<SmallVector<std::string>>
   getSystemGPUArchs(const llvm::opt::ArgList &Args) const;
 
   /// addProfileRTLibs - When -fprofile-instr-profile is specified, try to pass
   /// a suitable profile runtime library to the linker.
   virtual void addProfileRTLibs(const llvm::opt::ArgList &Args,
                                 llvm::opt::ArgStringList &CmdArgs) const;
 
   /// Add arguments to use system-specific CUDA includes.
   virtual void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args) const;
 
   /// Add arguments to use system-specific HIP includes.
   virtual void AddHIPIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                  llvm::opt::ArgStringList &CC1Args) const;
 
   /// Add arguments to use system-specific SYCL includes.
   virtual void addSYCLIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args) const;
 
   /// Add arguments to use MCU GCC toolchain includes.
   virtual void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                    llvm::opt::ArgStringList &CC1Args) const;
 
   /// On Windows, returns the MSVC compatibility version.
   virtual VersionTuple computeMSVCVersion(const Driver *D,
                                           const llvm::opt::ArgList &Args) const;
 
   /// Get paths for device libraries.
   virtual llvm::SmallVector<BitCodeLibraryInfo, 12>
   getDeviceLibs(const llvm::opt::ArgList &Args) const;
 
   /// Add the system specific linker arguments to use
   /// for the given HIP runtime library type.
   virtual void AddHIPRuntimeLibArgs(const llvm::opt::ArgList &Args,
                                     llvm::opt::ArgStringList &CmdArgs) const {}
 
   /// Return sanitizers which are available in this toolchain.
   virtual SanitizerMask getSupportedSanitizers() const;
 
   /// Return sanitizers which are enabled by default.
   virtual SanitizerMask getDefaultSanitizers() const {
     return SanitizerMask();
   }
 
   /// Returns true when it's possible to split LTO unit to use whole
   /// program devirtualization and CFI santiizers.
   virtual bool canSplitThinLTOUnit() const { return true; }
 
   /// Returns the output denormal handling type in the default floating point
   /// environment for the given \p FPType if given. Otherwise, the default
   /// assumed mode for any floating point type.
   virtual llvm::DenormalMode getDefaultDenormalModeForType(
       const llvm::opt::ArgList &DriverArgs, const JobAction &JA,
       const llvm::fltSemantics *FPType = nullptr) const {
     return llvm::DenormalMode::getIEEE();
   }
 
   // We want to expand the shortened versions of the triples passed in to
   // the values used for the bitcode libraries.
   static llvm::Triple getOpenMPTriple(StringRef TripleStr) {
     llvm::Triple TT(TripleStr);
     if (TT.getVendor() == llvm::Triple::UnknownVendor ||
         TT.getOS() == llvm::Triple::UnknownOS) {
       if (TT.getArch() == llvm::Triple::nvptx)
         return llvm::Triple("nvptx-nvidia-cuda");
       if (TT.getArch() == llvm::Triple::nvptx64)
         return llvm::Triple("nvptx64-nvidia-cuda");
       if (TT.getArch() == llvm::Triple::amdgcn)
         return llvm::Triple("amdgcn-amd-amdhsa");
     }
     return TT;
   }
 };
 
 /// Set a ToolChain's effective triple. Reset it when the registration object
 /// is destroyed.
 class RegisterEffectiveTriple {
   const ToolChain &TC;
 
 public:
   RegisterEffectiveTriple(const ToolChain &TC, llvm::Triple T) : TC(TC) {
     TC.setEffectiveTriple(std::move(T));
   }
 
   ~RegisterEffectiveTriple() { TC.setEffectiveTriple(llvm::Triple()); }
 };
 
 } // namespace driver
 
 } // namespace clang
 
 #endif // LLVM_CLANG_DRIVER_TOOLCHAIN_H

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