Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

//===- 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/DebugInfoOptions.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/ADT/Triple.h"

#include "llvm/MC/MCTargetOptions.h"

#include "llvm/Option/Option.h"

#include "llvm/Support/VersionTuple.h"

#include "llvm/Target/TargetOptions.h"

#include <cassert>

#include <climits>

#include <memory>

#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,

  };

  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;

  /// 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);

  }

  mutable std::optional<CXXStdlibType> cxxStdlibType;

  mutable std::optional<RuntimeLibType> runtimeLibType;

  mutable std::optional<UnwindLibType> unwindLibType;

protected:

  MultilibSet Multilibs;

  Multilib SelectedMultilib;

  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;

  /// \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 Multilib &getMultilib() const { return SelectedMultilib; }

  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; }

  /// 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 false; }

  /// 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 target specific runtime paths.

  path_list getRuntimePaths() const;

  // Returns target specific standard library paths.

  path_list getStdlibPaths() const;

  // Returns <ResourceDir>/lib/<OSName>/<arch>.  This is used by runtimes (such

  // as OpenMP) to find arch-specific libraries.

  std::string getArchSpecificLibPath() 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 codegenoptions::DebugInfoFormat getDefaultDebugFormat() const {

    return 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(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 -mmacosx-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;

  // 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 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()); }