Darwin.h

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//===--- Darwin.h - Darwin ToolChain Implementations ------------*- 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_LIB_DRIVER_TOOLCHAINS_DARWIN_H
#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_DARWIN_H
 
#include "clang/Basic/DarwinSDKInfo.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Driver/CudaInstallationDetector.h"
#include "clang/Driver/LazyDetector.h"
#include "clang/Driver/RocmInstallationDetector.h"
#include "clang/Driver/SyclInstallationDetector.h"
#include "clang/Driver/Tool.h"
#include "clang/Driver/ToolChain.h"
#include "clang/Driver/XRayArgs.h"
 
namespace clang {
namespace driver {
 
namespace toolchains {
class MachO;
} // end namespace toolchains
 
namespace tools {
 
namespace darwin {
llvm::Triple::ArchType getArchTypeForMachOArchName(StringRef Str);
void setTripleTypeForMachOArchName(llvm::Triple &T, StringRef Str,
                                   const llvm::opt::ArgList &Args);
 
class LLVM_LIBRARY_VISIBILITY MachOTool : public Tool {
  virtual void anchor();
 
protected:
  void AddMachOArch(const llvm::opt::ArgList &Args,
                    llvm::opt::ArgStringList &CmdArgs) const;
 
  const toolchains::MachO &getMachOToolChain() const {
    return reinterpret_cast<const toolchains::MachO &>(getToolChain());
  }
 
public:
  MachOTool(const char *Name, const char *ShortName, const ToolChain &TC)
      : Tool(Name, ShortName, TC) {}
};
 
class LLVM_LIBRARY_VISIBILITY Assembler : public MachOTool {
public:
  Assembler(const ToolChain &TC)
      : MachOTool("darwin::Assembler", "assembler", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
 
class LLVM_LIBRARY_VISIBILITY Linker : public MachOTool {
  bool NeedsTempPath(const InputInfoList &Inputs) const;
  void AddLinkArgs(Compilation &C, const llvm::opt::ArgList &Args,
                   llvm::opt::ArgStringList &CmdArgs,
                   const InputInfoList &Inputs, VersionTuple Version,
                   bool LinkerIsLLD, bool UsePlatformVersion) const;
 
public:
  Linker(const ToolChain &TC) : MachOTool("darwin::Linker", "linker", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
  bool isLinkJob() const override { return true; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
 
class LLVM_LIBRARY_VISIBILITY StaticLibTool : public MachOTool {
public:
  StaticLibTool(const ToolChain &TC)
      : MachOTool("darwin::StaticLibTool", "static-lib-linker", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
  bool isLinkJob() const override { return true; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
 
class LLVM_LIBRARY_VISIBILITY Lipo : public MachOTool {
public:
  Lipo(const ToolChain &TC) : MachOTool("darwin::Lipo", "lipo", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
 
class LLVM_LIBRARY_VISIBILITY Dsymutil : public MachOTool {
public:
  Dsymutil(const ToolChain &TC)
      : MachOTool("darwin::Dsymutil", "dsymutil", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
  bool isDsymutilJob() const override { return true; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
 
class LLVM_LIBRARY_VISIBILITY VerifyDebug : public MachOTool {
public:
  VerifyDebug(const ToolChain &TC)
      : MachOTool("darwin::VerifyDebug", "dwarfdump", TC) {}
 
  bool hasIntegratedCPP() const override { return false; }
 
  void ConstructJob(Compilation &C, const JobAction &JA,
                    const InputInfo &Output, const InputInfoList &Inputs,
                    const llvm::opt::ArgList &TCArgs,
                    const char *LinkingOutput) const override;
};
} // end namespace darwin
} // end namespace tools
 
namespace toolchains {
 
class LLVM_LIBRARY_VISIBILITY MachO : public ToolChain {
protected:
  Tool *buildAssembler() const override;
  Tool *buildLinker() const override;
  Tool *buildStaticLibTool() const override;
  Tool *getTool(Action::ActionClass AC) const override;
 
  void
  addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
                        llvm::opt::ArgStringList &CC1Args,
                        Action::OffloadKind DeviceOffloadKind) const override;
 
private:
  mutable std::unique_ptr<tools::darwin::Lipo> Lipo;
  mutable std::unique_ptr<tools::darwin::Dsymutil> Dsymutil;
  mutable std::unique_ptr<tools::darwin::VerifyDebug> VerifyDebug;
 
  /// The version of the linker known to be available in the tool chain.
  mutable std::optional<VersionTuple> LinkerVersion;
 
public:
  MachO(const Driver &D, const llvm::Triple &Triple,
        const llvm::opt::ArgList &Args);
  ~MachO() override;
 
  /// @name MachO specific toolchain API
  /// {
 
  /// Get the "MachO" arch name for a particular compiler invocation. For
  /// example, Apple treats different ARM variations as distinct architectures.
  StringRef getMachOArchName(const llvm::opt::ArgList &Args) const;
 
  /// Get the version of the linker known to be available for a particular
  /// compiler invocation (via the `-mlinker-version=` arg).
  VersionTuple getLinkerVersion(const llvm::opt::ArgList &Args) const;
 
  /// Add the linker arguments to link the ARC runtime library.
  virtual void AddLinkARCArgs(const llvm::opt::ArgList &Args,
                              llvm::opt::ArgStringList &CmdArgs) const {}
 
  /// Add the linker arguments to link the compiler runtime library.
  ///
  /// FIXME: This API is intended for use with embedded libraries only, and is
  /// misleadingly named.
  virtual void AddLinkRuntimeLibArgs(const llvm::opt::ArgList &Args,
                                     llvm::opt::ArgStringList &CmdArgs,
                                     bool ForceLinkBuiltinRT = false) const;
 
  virtual void addStartObjectFileArgs(const llvm::opt::ArgList &Args,
                                      llvm::opt::ArgStringList &CmdArgs) const {
  }
 
  virtual void addMinVersionArgs(const llvm::opt::ArgList &Args,
                                 llvm::opt::ArgStringList &CmdArgs) const {}
 
  virtual void addPlatformVersionArgs(const llvm::opt::ArgList &Args,
                                      llvm::opt::ArgStringList &CmdArgs) const {
  }
 
  virtual bool HasPlatformPrefix(const llvm::Triple &T) const { return false; }
 
  virtual void AppendPlatformPrefix(SmallString<128> &Path,
                                    const llvm::Triple &T) const {}
 
  /// On some iOS platforms, kernel and kernel modules were built statically. Is
  /// this such a target?
  virtual bool isKernelStatic() const { return false; }
 
  /// Is the target either iOS or an iOS simulator?
  bool isTargetIOSBased() const { return false; }
 
  /// Options to control how a runtime library is linked.
  enum RuntimeLinkOptions : unsigned {
    /// Link the library in even if it can't be found in the VFS.
    RLO_AlwaysLink = 1 << 0,
 
    /// Use the embedded runtime from the macho_embedded directory.
    RLO_IsEmbedded = 1 << 1,
 
    /// Emit rpaths for @executable_path as well as the resource directory.
    RLO_AddRPath = 1 << 2,
  };
 
  /// Add a runtime library to the list of items to link.
  void AddLinkRuntimeLib(const llvm::opt::ArgList &Args,
                         llvm::opt::ArgStringList &CmdArgs, StringRef Component,
                         RuntimeLinkOptions Opts = RuntimeLinkOptions(),
                         bool IsShared = false) const;
 
  /// Add any profiling runtime libraries that are needed. This is essentially a
  /// MachO specific version of addProfileRT in Tools.cpp.
  void addProfileRTLibs(const llvm::opt::ArgList &Args,
                        llvm::opt::ArgStringList &CmdArgs) const override {
    // There aren't any profiling libs for embedded targets currently.
  }
 
  // Return the full path of the compiler-rt library on a non-Darwin MachO
  // system. Those are under
  // <resourcedir>/lib/darwin/macho_embedded/<...>(.dylib|.a).
  std::string getCompilerRT(const llvm::opt::ArgList &Args, StringRef Component,
                            FileType Type = ToolChain::FT_Static,
                            bool IsFortran = false) const override;
 
  /// }
  /// @name ToolChain Implementation
  /// {
 
  types::ID LookupTypeForExtension(StringRef Ext) const override;
 
  bool HasNativeLLVMSupport() const override;
 
  llvm::opt::DerivedArgList *
  TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
                Action::OffloadKind DeviceOffloadKind) const override;
 
  bool IsBlocksDefault() const override {
    // Always allow blocks on Apple; users interested in versioning are
    // expected to use /usr/include/Block.h.
    return true;
  }
 
  bool IsMathErrnoDefault() const override { return false; }
 
  bool IsEncodeExtendedBlockSignatureDefault() const override { return true; }
 
  bool IsObjCNonFragileABIDefault() const override {
    // Non-fragile ABI is default for everything but i386.
    return getTriple().getArch() != llvm::Triple::x86;
  }
 
  bool UseObjCMixedDispatch() const override { return true; }
 
  UnwindTableLevel
  getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const override;
 
  RuntimeLibType GetDefaultRuntimeLibType() const override {
    return ToolChain::RLT_CompilerRT;
  }
 
  bool isPICDefault() const override;
  bool isPIEDefault(const llvm::opt::ArgList &Args) const override;
  bool isPICDefaultForced() const override;
 
  bool SupportsProfiling() const override;
 
  bool UseDwarfDebugFlags() const override;
  std::string GetGlobalDebugPathRemapping() const override;
 
  llvm::ExceptionHandling
  GetExceptionModel(const llvm::opt::ArgList &Args) const override {
    return llvm::ExceptionHandling::None;
  }
 
  virtual StringRef getOSLibraryNameSuffix(bool IgnoreSim = false) const {
    return "";
  }
 
  // Darwin toolchain uses legacy thin LTO API, which is not
  // capable of unit splitting.
  bool canSplitThinLTOUnit() const override { return false; }
  /// }
};
 
/// Apple specific MachO extensions
class LLVM_LIBRARY_VISIBILITY AppleMachO : public MachO {
public:
  AppleMachO(const Driver &D, const llvm::Triple &Triple,
             const llvm::opt::ArgList &Args);
  ~AppleMachO() override;
 
  /// }
  /// @name Apple Specific ToolChain Implementation
  /// {
  void
  AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
 
  void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                          llvm::opt::ArgStringList &CC1Args) const override;
  void AddHIPIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                         llvm::opt::ArgStringList &CC1Args) const override;
  void addSYCLIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                          llvm::opt::ArgStringList &CC1Args) const override;
 
  void AddClangCXXStdlibIncludeArgs(
      const llvm::opt::ArgList &DriverArgs,
      llvm::opt::ArgStringList &CC1Args) const override;
  void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
                           llvm::opt::ArgStringList &CmdArgs) const override;
 
  void printVerboseInfo(raw_ostream &OS) const override;
  /// }
 
  LazyDetector<CudaInstallationDetector> CudaInstallation;
  LazyDetector<RocmInstallationDetector> RocmInstallation;
  LazyDetector<SYCLInstallationDetector> SYCLInstallation;
 
protected:
  llvm::SmallString<128>
  GetEffectiveSysroot(const llvm::opt::ArgList &DriverArgs) const;
 
private:
  virtual void
  AddGnuCPlusPlusIncludePaths(const llvm::opt::ArgList &DriverArgs,
                              llvm::opt::ArgStringList &CC1Args) const;
};
 
/// Darwin - The base Darwin tool chain.
class LLVM_LIBRARY_VISIBILITY Darwin : public AppleMachO {
public:
  /// Whether the information on the target has been initialized.
  //
  // FIXME: This should be eliminated. What we want to do is make this part of
  // the "default target for arguments" selection process, once we get out of
  // the argument translation business.
  mutable bool TargetInitialized;
 
  // TODO: Are these useful? Can we use Triple::OSType/EnvironmentType instead?
  enum DarwinPlatformKind {
    MacOS,
    IPhoneOS,
    TvOS,
    WatchOS,
    DriverKit,
    XROS,
    LastDarwinPlatform = XROS
  };
  enum DarwinEnvironmentKind {
    NativeEnvironment,
    Simulator,
    MacCatalyst,
  };
 
  mutable DarwinPlatformKind TargetPlatform;
  mutable DarwinEnvironmentKind TargetEnvironment;
 
  /// The native OS version we are targeting.
  mutable VersionTuple TargetVersion;
  /// The OS version we are targeting as specified in the triple.
  mutable VersionTuple OSTargetVersion;
 
  /// The information about the darwin SDK that was used.
  mutable std::optional<DarwinSDKInfo> SDKInfo;
 
  /// The target variant triple that was specified (if any).
  mutable std::optional<llvm::Triple> TargetVariantTriple;
 
private:
  void AddDeploymentTarget(llvm::opt::DerivedArgList &Args) const;
 
public:
  Darwin(const Driver &D, const llvm::Triple &Triple,
         const llvm::opt::ArgList &Args);
  ~Darwin() override;
 
  std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args,
                                          types::ID InputType) const override;
 
  /// @name Darwin Specific Toolchain Implementation
  /// {
 
  void addMinVersionArgs(const llvm::opt::ArgList &Args,
                         llvm::opt::ArgStringList &CmdArgs) const override;
 
  void addPlatformVersionArgs(const llvm::opt::ArgList &Args,
                              llvm::opt::ArgStringList &CmdArgs) const override;
 
  void addStartObjectFileArgs(const llvm::opt::ArgList &Args,
                              llvm::opt::ArgStringList &CmdArgs) const override;
 
  bool isKernelStatic() const override {
    return (!(isTargetIPhoneOS() && !isIPhoneOSVersionLT(6, 0)) &&
            !isTargetWatchOS() && !isTargetDriverKit());
  }
 
  void addProfileRTLibs(const llvm::opt::ArgList &Args,
                        llvm::opt::ArgStringList &CmdArgs) const override;
 
  // Return the full path of the compiler-rt library on a Darwin MachO system.
  // Those are under <resourcedir>/lib/darwin/<...>(.dylib|.a).
  std::string getCompilerRT(const llvm::opt::ArgList &Args, StringRef Component,
                            FileType Type = ToolChain::FT_Static,
                            bool IsFortran = false) const override;
 
protected:
  /// }
  /// @name Darwin specific Toolchain functions
  /// {
 
  // FIXME: Eliminate these ...Target functions and derive separate tool chains
  // for these targets and put version in constructor.
  void setTarget(DarwinPlatformKind Platform, DarwinEnvironmentKind Environment,
                 unsigned Major, unsigned Minor, unsigned Micro,
                 VersionTuple NativeTargetVersion) const {
    // FIXME: For now, allow reinitialization as long as values don't
    // change. This will go away when we move away from argument translation.
    if (TargetInitialized && TargetPlatform == Platform &&
        TargetEnvironment == Environment &&
        (Environment == MacCatalyst ? OSTargetVersion : TargetVersion) ==
            VersionTuple(Major, Minor, Micro))
      return;
 
    assert(!TargetInitialized && "Target already initialized!");
    TargetInitialized = true;
    TargetPlatform = Platform;
    TargetEnvironment = Environment;
    TargetVersion = VersionTuple(Major, Minor, Micro);
    if (Environment == Simulator)
      const_cast<Darwin *>(this)->setTripleEnvironment(llvm::Triple::Simulator);
    else if (Environment == MacCatalyst) {
      const_cast<Darwin *>(this)->setTripleEnvironment(llvm::Triple::MacABI);
      TargetVersion = NativeTargetVersion;
      OSTargetVersion = VersionTuple(Major, Minor, Micro);
    }
  }
 
public:
  bool isTargetIPhoneOS() const {
    assert(TargetInitialized && "Target not initialized!");
    return (TargetPlatform == IPhoneOS || TargetPlatform == TvOS) &&
           TargetEnvironment == NativeEnvironment;
  }
 
  bool isTargetIOSSimulator() const {
    assert(TargetInitialized && "Target not initialized!");
    return (TargetPlatform == IPhoneOS || TargetPlatform == TvOS) &&
           TargetEnvironment == Simulator;
  }
 
  bool isTargetIOSBased() const {
    assert(TargetInitialized && "Target not initialized!");
    return isTargetIPhoneOS() || isTargetIOSSimulator();
  }
 
  bool isTargetXROSDevice() const {
    return TargetPlatform == XROS && TargetEnvironment == NativeEnvironment;
  }
 
  bool isTargetXROSSimulator() const {
    return TargetPlatform == XROS && TargetEnvironment == Simulator;
  }
 
  bool isTargetXROS() const { return TargetPlatform == XROS; }
 
  bool isTargetTvOS() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == TvOS && TargetEnvironment == NativeEnvironment;
  }
 
  bool isTargetTvOSSimulator() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == TvOS && TargetEnvironment == Simulator;
  }
 
  bool isTargetTvOSBased() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == TvOS;
  }
 
  bool isTargetWatchOS() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == WatchOS && TargetEnvironment == NativeEnvironment;
  }
 
  bool isTargetWatchOSSimulator() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == WatchOS && TargetEnvironment == Simulator;
  }
 
  bool isTargetWatchOSBased() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == WatchOS;
  }
 
  bool isTargetDriverKit() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == DriverKit;
  }
 
  bool isTargetMacCatalyst() const {
    return TargetPlatform == IPhoneOS && TargetEnvironment == MacCatalyst;
  }
 
  bool isTargetMacOS() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == MacOS;
  }
 
  bool isTargetMacOSBased() const {
    assert(TargetInitialized && "Target not initialized!");
    return TargetPlatform == MacOS || isTargetMacCatalyst();
  }
 
  bool isTargetAppleSiliconMac() const {
    assert(TargetInitialized && "Target not initialized!");
    return isTargetMacOSBased() && getArch() == llvm::Triple::aarch64;
  }
 
  bool isTargetInitialized() const { return TargetInitialized; }
 
  /// The version of the OS that's used by the OS specified in the target
  /// triple. It might be different from the actual target OS on which the
  /// program will run, e.g. MacCatalyst code runs on a macOS target, but its
  /// target triple is iOS.
  VersionTuple getTripleTargetVersion() const {
    assert(TargetInitialized && "Target not initialized!");
    return isTargetMacCatalyst() ? OSTargetVersion : TargetVersion;
  }
 
  bool isIPhoneOSVersionLT(unsigned V0, unsigned V1 = 0,
                           unsigned V2 = 0) const {
    assert(isTargetIOSBased() && "Unexpected call for non iOS target!");
    return TargetVersion < VersionTuple(V0, V1, V2);
  }
 
  /// Returns true if the minimum supported macOS version for the slice that's
  /// being built is less than the specified version. If there's no minimum
  /// supported macOS version, the deployment target version is compared to the
  /// specifed version instead.
  bool isMacosxVersionLT(unsigned V0, unsigned V1 = 0, unsigned V2 = 0) const {
    assert(isTargetMacOSBased() &&
           (getTriple().isMacOSX() || getTriple().isMacCatalystEnvironment()) &&
           "Unexpected call for non OS X target!");
    // The effective triple might not be initialized yet, so construct a
    // pseudo-effective triple to get the minimum supported OS version.
    VersionTuple MinVers =
        llvm::Triple(getTriple().getArchName(), "apple", "macos")
            .getMinimumSupportedOSVersion();
    return (!MinVers.empty() && MinVers > TargetVersion
                ? MinVers
                : TargetVersion) < VersionTuple(V0, V1, V2);
  }
 
protected:
  /// Return true if c++17 aligned allocation/deallocation functions are not
  /// implemented in the c++ standard library of the deployment target we are
  /// targeting.
  bool isAlignedAllocationUnavailable() const;
 
  /// Return true if c++14 sized deallocation functions are not implemented in
  /// the c++ standard library of the deployment target we are targeting.
  bool isSizedDeallocationUnavailable() const;
 
  void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
                             llvm::opt::ArgStringList &CC1Args,
                             Action::OffloadKind DeviceOffloadKind) const override;
 
  void addClangCC1ASTargetOptions(
      const llvm::opt::ArgList &Args,
      llvm::opt::ArgStringList &CC1ASArgs) const override;
 
  StringRef getPlatformFamily() const;
  StringRef getOSLibraryNameSuffix(bool IgnoreSim = false) const override;
 
public:
  static StringRef getSDKName(StringRef isysroot);
 
  /// }
  /// @name ToolChain Implementation
  /// {
 
  // Darwin tools support multiple architecture (e.g., i386 and x86_64) and
  // most development is done against SDKs, so compiling for a different
  // architecture should not get any special treatment.
  bool isCrossCompiling() const override { return false; }
 
  llvm::opt::DerivedArgList *
  TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch,
                Action::OffloadKind DeviceOffloadKind) const override;
 
  CXXStdlibType GetDefaultCXXStdlibType() const override;
  ObjCRuntime getDefaultObjCRuntime(bool isNonFragile) const override;
  bool hasBlocksRuntime() const override;
 
  bool UseObjCMixedDispatch() const override {
    // This is only used with the non-fragile ABI and non-legacy dispatch.
 
    // Mixed dispatch is used everywhere except OS X before 10.6.
    return !(isTargetMacOSBased() && isMacosxVersionLT(10, 6));
  }
 
  LangOptions::StackProtectorMode
  GetDefaultStackProtectorLevel(bool KernelOrKext) const override {
    // Stack protectors default to on for user code on 10.5,
    // and for everything in 10.6 and beyond
    if (isTargetIOSBased() || isTargetWatchOSBased() || isTargetDriverKit() ||
        isTargetXROS())
      return LangOptions::SSPOn;
    else if (isTargetMacOSBased() && !isMacosxVersionLT(10, 6))
      return LangOptions::SSPOn;
    else if (isTargetMacOSBased() && !isMacosxVersionLT(10, 5) && !KernelOrKext)
      return LangOptions::SSPOn;
 
    return LangOptions::SSPOff;
  }
 
  void CheckObjCARC() const override;
 
  llvm::ExceptionHandling GetExceptionModel(
      const llvm::opt::ArgList &Args) const override;
 
  bool SupportsEmbeddedBitcode() const override;
 
  SanitizerMask getSupportedSanitizers() const override;
};
 
/// DarwinClang - The Darwin toolchain used by Clang.
class LLVM_LIBRARY_VISIBILITY DarwinClang : public Darwin {
public:
  DarwinClang(const Driver &D, const llvm::Triple &Triple,
              const llvm::opt::ArgList &Args);
 
  /// @name Apple ToolChain Implementation
  /// {
 
  void
  AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
 
  RuntimeLibType GetRuntimeLibType(const llvm::opt::ArgList &Args) const override;
 
  void AddLinkRuntimeLibArgs(const llvm::opt::ArgList &Args,
                             llvm::opt::ArgStringList &CmdArgs,
                             bool ForceLinkBuiltinRT = false) const override;
 
  void AddCCKextLibArgs(const llvm::opt::ArgList &Args,
                        llvm::opt::ArgStringList &CmdArgs) const override;
 
  void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const override;
 
  void
  addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
                        llvm::opt::ArgStringList &CC1Args,
                        Action::OffloadKind DeviceOffloadKind) const override;
 
  void AddLinkARCArgs(const llvm::opt::ArgList &Args,
                      llvm::opt::ArgStringList &CmdArgs) const override;
 
  bool HasPlatformPrefix(const llvm::Triple &T) const override;
 
  void AppendPlatformPrefix(SmallString<128> &Path,
                            const llvm::Triple &T) const override;
 
  unsigned GetDefaultDwarfVersion() const override;
  // Until dtrace (via CTF) and LLDB can deal with distributed debug info,
  // Darwin defaults to standalone/full debug info.
  bool GetDefaultStandaloneDebug() const override { return true; }
  llvm::DebuggerKind getDefaultDebuggerTuning() const override {
    return llvm::DebuggerKind::LLDB;
  }
 
  /// }
 
private:
  void AddLinkSanitizerLibArgs(const llvm::opt::ArgList &Args,
                               llvm::opt::ArgStringList &CmdArgs,
                               StringRef Sanitizer,
                               bool shared = true) const;
 
  void
  AddGnuCPlusPlusIncludePaths(const llvm::opt::ArgList &DriverArgs,
                              llvm::opt::ArgStringList &CC1Args) const override;
 
  bool AddGnuCPlusPlusIncludePaths(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args,
                                   llvm::SmallString<128> Base,
                                   llvm::StringRef Version,
                                   llvm::StringRef ArchDir,
                                   llvm::StringRef BitDir) const;
};
 
} // end namespace toolchains
} // end namespace driver
} // end namespace clang
 
#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_DARWIN_H