lib/Driver/ToolChains.h - platform/external/clang - Git at Google

 //===--- ToolChains.h - ToolChain Implementations ---------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #ifndef CLANG_LIB_DRIVER_TOOLCHAINS_H_
 #define CLANG_LIB_DRIVER_TOOLCHAINS_H_

 #include "clang/Driver/Action.h"
 #include "clang/Driver/ToolChain.h"

 #include "llvm/ADT/DenseMap.h"
 #include "llvm/Support/Compiler.h"

 #include "Tools.h"

 namespace clang {
 namespace driver {
 namespace toolchains {

 /// Generic_GCC - A tool chain using the 'gcc' command to perform
 /// all subcommands; this relies on gcc translating the majority of
 /// command line options.
 class LLVM_LIBRARY_VISIBILITY Generic_GCC : public ToolChain {
 protected:
   /// \brief Struct to store and manipulate GCC versions.
   ///
   /// We rely on assumptions about the form and structure of GCC version
   /// numbers: they consist of at most three '.'-separated components, and each
   /// component is a non-negative integer except for the last component. For
   /// the last component we are very flexible in order to tolerate release
   /// candidates or 'x' wildcards.
   ///
   /// Note that the ordering established among GCCVersions is based on the
   /// preferred version string to use. For example we prefer versions without
   /// a hard-coded patch number to those with a hard coded patch number.
   ///
   /// Currently this doesn't provide any logic for textual suffixes to patches
   /// in the way that (for example) Debian's version format does. If that ever
   /// becomes necessary, it can be added.
   struct GCCVersion {
     /// \brief The unparsed text of the version.
     std::string Text;

     /// \brief The parsed major, minor, and patch numbers.
     int Major, Minor, Patch;

     /// \brief Any textual suffix on the patch number.
     std::string PatchSuffix;

     static GCCVersion Parse(StringRef VersionText);
     bool operator<(const GCCVersion &RHS) const;
     bool operator>(const GCCVersion &RHS) const { return RHS < *this; }
     bool operator<=(const GCCVersion &RHS) const { return !(*this > RHS); }
     bool operator>=(const GCCVersion &RHS) const { return !(*this < RHS); }
   };


   /// \brief This is a class to find a viable GCC installation for Clang to
   /// use.
   ///
   /// This class tries to find a GCC installation on the system, and report
   /// information about it. It starts from the host information provided to the
   /// Driver, and has logic for fuzzing that where appropriate.
   class GCCInstallationDetector {

     bool IsValid;
     llvm::Triple GCCTriple;

     // FIXME: These might be better as path objects.
     std::string GCCInstallPath;
     std::string GCCMultiarchSuffix;
     std::string GCCParentLibPath;

     GCCVersion Version;

   public:
     GCCInstallationDetector(const Driver &D, const llvm::Triple &TargetTriple);

     /// \brief Check whether we detected a valid GCC install.
     bool isValid() const { return IsValid; }

     /// \brief Get the GCC triple for the detected install.
     const llvm::Triple &getTriple() const { return GCCTriple; }

     /// \brief Get the detected GCC installation path.
     StringRef getInstallPath() const { return GCCInstallPath; }

     /// \brief Get the detected GCC installation path suffix for multiarch GCCs.
     StringRef getMultiarchSuffix() const { return GCCMultiarchSuffix; }

     /// \brief Get the detected GCC parent lib path.
     StringRef getParentLibPath() const { return GCCParentLibPath; }

     /// \brief Get the detected GCC version string.
     StringRef getVersion() const { return Version.Text; }

   private:
     static void CollectLibDirsAndTriples(
       const llvm::Triple &TargetTriple,
       const llvm::Triple &MultiarchTriple,
       SmallVectorImpl<StringRef> &LibDirs,
       SmallVectorImpl<StringRef> &TripleAliases,
       SmallVectorImpl<StringRef> &MultiarchLibDirs,
       SmallVectorImpl<StringRef> &MultiarchTripleAliases);

     void ScanLibDirForGCCTriple(llvm::Triple::ArchType TargetArch,
                                 const std::string &LibDir,
                                 StringRef CandidateTriple,
                                 bool NeedsMultiarchSuffix = false);
   };

   GCCInstallationDetector GCCInstallation;

   mutable llvm::DenseMap<unsigned, Tool*> Tools;

 public:
   Generic_GCC(const Driver &D, const llvm::Triple& Triple);
   ~Generic_GCC();

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;

   virtual bool IsUnwindTablesDefault() const;
   virtual const char *GetDefaultRelocationModel() const;
   virtual const char *GetForcedPicModel() const;

 protected:
   /// \name ToolChain Implementation Helper Functions
   /// @{

   /// \brief Check whether the target triple's architecture is 64-bits.
   bool isTarget64Bit() const {
     return (getTriple().getArch() == llvm::Triple::x86_64 ||
             getTriple().getArch() == llvm::Triple::ppc64);
   }
   /// \brief Check whether the target triple's architecture is 32-bits.
   /// FIXME: This should likely do more than just negate the 64-bit query.
   bool isTarget32Bit() const { return !isTarget64Bit(); }

   /// @}
 };

 class LLVM_LIBRARY_VISIBILITY Hexagon_TC : public ToolChain {
 protected:
   mutable llvm::DenseMap<unsigned, Tool*> Tools;

 public:
   Hexagon_TC(const Driver &D, const llvm::Triple& Triple);
   ~Hexagon_TC();

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;

   virtual bool IsUnwindTablesDefault() const;
   virtual const char *GetDefaultRelocationModel() const;
   virtual const char *GetForcedPicModel() const;
 };

   /// Darwin - The base Darwin tool chain.
 class LLVM_LIBRARY_VISIBILITY Darwin : public ToolChain {
 public:
   /// The host version.
   unsigned DarwinVersion[3];

 private:
   mutable llvm::DenseMap<unsigned, Tool*> Tools;

   /// 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;

   // FIXME: Remove this once there is a proper way to detect an ARC runtime
   // for the simulator.
  public:
   mutable enum {
     ARCSimulator_None,
     ARCSimulator_HasARCRuntime,
     ARCSimulator_NoARCRuntime
   } ARCRuntimeForSimulator;

   mutable enum {
     LibCXXSimulator_None,
     LibCXXSimulator_NotAvailable,
     LibCXXSimulator_Available
   } LibCXXForSimulator;

 private:
   /// Whether we are targeting iPhoneOS target.
   mutable bool TargetIsIPhoneOS;

   /// Whether we are targeting the iPhoneOS simulator target.
   mutable bool TargetIsIPhoneOSSimulator;

   /// The OS version we are targeting.
   mutable unsigned TargetVersion[3];

   /// The default macosx-version-min of this tool chain; empty until
   /// initialized.
   std::string MacosxVersionMin;

   bool hasARCRuntime() const;

 private:
   void AddDeploymentTarget(DerivedArgList &Args) const;

 public:
   Darwin(const Driver &D, const llvm::Triple& Triple);
   ~Darwin();

   std::string ComputeEffectiveClangTriple(const ArgList &Args,
                                           types::ID InputType) const;

   /// @name Darwin Specific Toolchain API
   /// {

   // FIXME: Eliminate these ...Target functions and derive separate tool chains
   // for these targets and put version in constructor.
   void setTarget(bool IsIPhoneOS, unsigned Major, unsigned Minor,
                  unsigned Micro, bool IsIOSSim) const {
     assert((!IsIOSSim || IsIPhoneOS) && "Unexpected deployment target!");

     // 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 && TargetIsIPhoneOS == IsIPhoneOS &&
         TargetIsIPhoneOSSimulator == IsIOSSim &&
         TargetVersion[0] == Major && TargetVersion[1] == Minor &&
         TargetVersion[2] == Micro)
       return;

     assert(!TargetInitialized && "Target already initialized!");
     TargetInitialized = true;
     TargetIsIPhoneOS = IsIPhoneOS;
     TargetIsIPhoneOSSimulator = IsIOSSim;
     TargetVersion[0] = Major;
     TargetVersion[1] = Minor;
     TargetVersion[2] = Micro;
   }

   bool isTargetIPhoneOS() const {
     assert(TargetInitialized && "Target not initialized!");
     return TargetIsIPhoneOS;
   }

   bool isTargetIOSSimulator() const {
     assert(TargetInitialized && "Target not initialized!");
     return TargetIsIPhoneOSSimulator;
   }

   bool isTargetInitialized() const { return TargetInitialized; }

   void getTargetVersion(unsigned (&Res)[3]) const {
     assert(TargetInitialized && "Target not initialized!");
     Res[0] = TargetVersion[0];
     Res[1] = TargetVersion[1];
     Res[2] = TargetVersion[2];
   }

   /// getDarwinArchName - Get the "Darwin" arch name for a particular compiler
   /// invocation. For example, Darwin treats different ARM variations as
   /// distinct architectures.
   StringRef getDarwinArchName(const ArgList &Args) const;

   static bool isVersionLT(unsigned (&A)[3], unsigned (&B)[3]) {
     for (unsigned i=0; i < 3; ++i) {
       if (A[i] > B[i]) return false;
       if (A[i] < B[i]) return true;
     }
     return false;
   }

   bool isIPhoneOSVersionLT(unsigned V0, unsigned V1=0, unsigned V2=0) const {
     assert(isTargetIPhoneOS() && "Unexpected call for OS X target!");
     unsigned B[3] = { V0, V1, V2 };
     return isVersionLT(TargetVersion, B);
   }

   bool isMacosxVersionLT(unsigned V0, unsigned V1=0, unsigned V2=0) const {
     assert(!isTargetIPhoneOS() && "Unexpected call for iPhoneOS target!");
     unsigned B[3] = { V0, V1, V2 };
     return isVersionLT(TargetVersion, B);
   }

   /// AddLinkSearchPathArgs - Add the linker search paths to \arg CmdArgs.
   ///
   /// \param Args - The input argument list.
   /// \param CmdArgs [out] - The command argument list to append the paths
   /// (prefixed by -L) to.
   virtual void AddLinkSearchPathArgs(const ArgList &Args,
                                      ArgStringList &CmdArgs) const = 0;

   /// AddLinkARCArgs - Add the linker arguments to link the ARC runtime library.
   virtual void AddLinkARCArgs(const ArgList &Args,
                               ArgStringList &CmdArgs) const = 0;

   /// AddLinkRuntimeLibArgs - Add the linker arguments to link the compiler
   /// runtime library.
   virtual void AddLinkRuntimeLibArgs(const ArgList &Args,
                                      ArgStringList &CmdArgs) const = 0;

   /// }
   /// @name ToolChain Implementation
   /// {

   virtual types::ID LookupTypeForExtension(const char *Ext) const;

   virtual bool HasNativeLLVMSupport() const;

   virtual void configureObjCRuntime(ObjCRuntime &runtime) const;
   virtual bool hasBlocksRuntime() const;

   virtual DerivedArgList *TranslateArgs(const DerivedArgList &Args,
                                         const char *BoundArch) const;

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;

   virtual bool IsBlocksDefault() const {
     // Always allow blocks on Darwin; users interested in versioning are
     // expected to use /usr/include/Blocks.h.
     return true;
   }
   virtual bool IsIntegratedAssemblerDefault() const {
 #ifdef DISABLE_DEFAULT_INTEGRATED_ASSEMBLER
     return false;
 #else
     // Default integrated assembler to on for x86.
     return (getTriple().getArch() == llvm::Triple::x86 ||
             getTriple().getArch() == llvm::Triple::x86_64);
 #endif
   }
   virtual bool IsStrictAliasingDefault() const {
 #ifdef DISABLE_DEFAULT_STRICT_ALIASING
     return false;
 #else
     return ToolChain::IsStrictAliasingDefault();
 #endif
   }

   virtual bool IsObjCDefaultSynthPropertiesDefault() const {
     return false;
   }

   virtual bool IsObjCNonFragileABIDefault() const {
     // Non-fragile ABI is default for everything but i386.
     return getTriple().getArch() != llvm::Triple::x86;
   }
   virtual bool IsObjCLegacyDispatchDefault() const {
     // This is only used with the non-fragile ABI.

     // Legacy dispatch is used everywhere except on x86_64.
     return getTriple().getArch() != llvm::Triple::x86_64;
   }
   virtual bool UseObjCMixedDispatch() const {
     // 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 !(!isTargetIPhoneOS() && isMacosxVersionLT(10, 6));
   }
   virtual bool IsUnwindTablesDefault() const;
   virtual unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const {
     // Stack protectors default to on for user code on 10.5,
     // and for everything in 10.6 and beyond
     return isTargetIPhoneOS() ||
       (!isMacosxVersionLT(10, 6) ||
          (!isMacosxVersionLT(10, 5) && !KernelOrKext));
   }
   virtual RuntimeLibType GetDefaultRuntimeLibType() const {
     return ToolChain::RLT_CompilerRT;
   }
   virtual const char *GetDefaultRelocationModel() const;
   virtual const char *GetForcedPicModel() const;

   virtual bool SupportsProfiling() const;

   virtual bool SupportsObjCGC() const;

   virtual bool UseDwarfDebugFlags() const;

   virtual bool UseSjLjExceptions() const;

   /// }
 };

 /// DarwinClang - The Darwin toolchain used by Clang.
 class LLVM_LIBRARY_VISIBILITY DarwinClang : public Darwin {
 private:
   void AddGCCLibexecPath(unsigned darwinVersion);

 public:
   DarwinClang(const Driver &D, const llvm::Triple& Triple);

   /// @name Darwin ToolChain Implementation
   /// {

   virtual void AddLinkSearchPathArgs(const ArgList &Args,
                                     ArgStringList &CmdArgs) const;

   virtual void AddLinkRuntimeLibArgs(const ArgList &Args,
                                      ArgStringList &CmdArgs) const;
   void AddLinkRuntimeLib(const ArgList &Args, ArgStringList &CmdArgs,
                          const char *DarwinStaticLib) const;

   virtual void AddCXXStdlibLibArgs(const ArgList &Args,
                                    ArgStringList &CmdArgs) const;

   virtual void AddCCKextLibArgs(const ArgList &Args,
                                 ArgStringList &CmdArgs) const;

   virtual void AddLinkARCArgs(const ArgList &Args,
                               ArgStringList &CmdArgs) const;
   /// }
 };

 /// Darwin_Generic_GCC - Generic Darwin tool chain using gcc.
 class LLVM_LIBRARY_VISIBILITY Darwin_Generic_GCC : public Generic_GCC {
 public:
   Darwin_Generic_GCC(const Driver &D, const llvm::Triple& Triple)
     : Generic_GCC(D, Triple) {}

   std::string ComputeEffectiveClangTriple(const ArgList &Args,
                                           types::ID InputType) const;

   virtual const char *GetDefaultRelocationModel() const { return "pic"; }
 };

 class LLVM_LIBRARY_VISIBILITY Generic_ELF : public Generic_GCC {
   virtual void anchor();
 public:
   Generic_ELF(const Driver &D, const llvm::Triple& Triple)
     : Generic_GCC(D, Triple) {}

   virtual bool IsIntegratedAssemblerDefault() const {
     // Default integrated assembler to on for x86.
     return (getTriple().getArch() == llvm::Triple::x86 ||
             getTriple().getArch() == llvm::Triple::x86_64);
   }
 };

 class LLVM_LIBRARY_VISIBILITY AuroraUX : public Generic_GCC {
 public:
   AuroraUX(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY OpenBSD : public Generic_ELF {
 public:
   OpenBSD(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY FreeBSD : public Generic_ELF {
 public:
   FreeBSD(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY NetBSD : public Generic_ELF {
   const llvm::Triple ToolTriple;

 public:
   NetBSD(const Driver &D, const llvm::Triple& Triple,
          const llvm::Triple& ToolTriple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY Minix : public Generic_ELF {
 public:
   Minix(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY DragonFly : public Generic_ELF {
 public:
   DragonFly(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
 };

 class LLVM_LIBRARY_VISIBILITY Linux : public Generic_ELF {
 public:
   Linux(const Driver &D, const llvm::Triple& Triple);

   virtual bool HasNativeLLVMSupport() const;

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;

   virtual void AddClangSystemIncludeArgs(const ArgList &DriverArgs,
                                          ArgStringList &CC1Args) const;
   virtual void AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
                                             ArgStringList &CC1Args) const;

   std::string Linker;
   std::vector<std::string> ExtraOpts;

 private:
   static bool addLibStdCXXIncludePaths(Twine Base, Twine TargetArchDir,
                                        const ArgList &DriverArgs,
                                        ArgStringList &CC1Args);
 };


 /// TCEToolChain - A tool chain using the llvm bitcode tools to perform
 /// all subcommands. See http://tce.cs.tut.fi for our peculiar target.
 class LLVM_LIBRARY_VISIBILITY TCEToolChain : public ToolChain {
 public:
   TCEToolChain(const Driver &D, const llvm::Triple& Triple);
   ~TCEToolChain();

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;
   bool IsMathErrnoDefault() const;
   bool IsUnwindTablesDefault() const;
   const char* GetDefaultRelocationModel() const;
   const char* GetForcedPicModel() const;

 private:
   mutable llvm::DenseMap<unsigned, Tool*> Tools;

 };

 class LLVM_LIBRARY_VISIBILITY Windows : public ToolChain {
   mutable llvm::DenseMap<unsigned, Tool*> Tools;

 public:
   Windows(const Driver &D, const llvm::Triple& Triple);

   virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
                            const ActionList &Inputs) const;

   virtual bool IsIntegratedAssemblerDefault() const;
   virtual bool IsUnwindTablesDefault() const;
   virtual const char *GetDefaultRelocationModel() const;
   virtual const char *GetForcedPicModel() const;

   virtual void AddClangSystemIncludeArgs(const ArgList &DriverArgs,
                                          ArgStringList &CC1Args) const;
   virtual void AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
                                             ArgStringList &CC1Args) const;

 };

 } // end namespace toolchains
 } // end namespace driver
 } // end namespace clang

 #endif
	//===--- ToolChains.h - ToolChain Implementations ---------------- C++ --===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#ifndef CLANG_LIB_DRIVER_TOOLCHAINS_H_
	#define CLANG_LIB_DRIVER_TOOLCHAINS_H_

	#include "clang/Driver/Action.h"
	#include "clang/Driver/ToolChain.h"

	#include "llvm/ADT/DenseMap.h"
	#include "llvm/Support/Compiler.h"

	#include "Tools.h"

	namespace clang {
	namespace driver {
	namespace toolchains {

	/// Generic_GCC - A tool chain using the 'gcc' command to perform
	/// all subcommands; this relies on gcc translating the majority of
	/// command line options.
	class LLVM_LIBRARY_VISIBILITY Generic_GCC : public ToolChain {
	protected:
	/// \brief Struct to store and manipulate GCC versions.
	///
	/// We rely on assumptions about the form and structure of GCC version
	/// numbers: they consist of at most three '.'-separated components, and each
	/// component is a non-negative integer except for the last component. For
	/// the last component we are very flexible in order to tolerate release
	/// candidates or 'x' wildcards.
	///
	/// Note that the ordering established among GCCVersions is based on the
	/// preferred version string to use. For example we prefer versions without
	/// a hard-coded patch number to those with a hard coded patch number.
	///
	/// Currently this doesn't provide any logic for textual suffixes to patches
	/// in the way that (for example) Debian's version format does. If that ever
	/// becomes necessary, it can be added.
	struct GCCVersion {
	/// \brief The unparsed text of the version.
	std::string Text;

	/// \brief The parsed major, minor, and patch numbers.
	int Major, Minor, Patch;

	/// \brief Any textual suffix on the patch number.
	std::string PatchSuffix;

	static GCCVersion Parse(StringRef VersionText);
	bool operator<(const GCCVersion &RHS) const;
	bool operator>(const GCCVersion &RHS) const { return RHS < *this; }
	bool operator<=(const GCCVersion &RHS) const { return !(*this > RHS); }
	bool operator>=(const GCCVersion &RHS) const { return !(*this < RHS); }
	};


	/// \brief This is a class to find a viable GCC installation for Clang to
	/// use.
	///
	/// This class tries to find a GCC installation on the system, and report
	/// information about it. It starts from the host information provided to the
	/// Driver, and has logic for fuzzing that where appropriate.
	class GCCInstallationDetector {

	bool IsValid;
	llvm::Triple GCCTriple;

	// FIXME: These might be better as path objects.
	std::string GCCInstallPath;
	std::string GCCMultiarchSuffix;
	std::string GCCParentLibPath;

	GCCVersion Version;

	public:
	GCCInstallationDetector(const Driver &D, const llvm::Triple &TargetTriple);

	/// \brief Check whether we detected a valid GCC install.
	bool isValid() const { return IsValid; }

	/// \brief Get the GCC triple for the detected install.
	const llvm::Triple &getTriple() const { return GCCTriple; }

	/// \brief Get the detected GCC installation path.
	StringRef getInstallPath() const { return GCCInstallPath; }

	/// \brief Get the detected GCC installation path suffix for multiarch GCCs.
	StringRef getMultiarchSuffix() const { return GCCMultiarchSuffix; }

	/// \brief Get the detected GCC parent lib path.
	StringRef getParentLibPath() const { return GCCParentLibPath; }

	/// \brief Get the detected GCC version string.
	StringRef getVersion() const { return Version.Text; }

	private:
	static void CollectLibDirsAndTriples(
	const llvm::Triple &TargetTriple,
	const llvm::Triple &MultiarchTriple,
	SmallVectorImpl<StringRef> &LibDirs,
	SmallVectorImpl<StringRef> &TripleAliases,
	SmallVectorImpl<StringRef> &MultiarchLibDirs,
	SmallVectorImpl<StringRef> &MultiarchTripleAliases);

	void ScanLibDirForGCCTriple(llvm::Triple::ArchType TargetArch,
	const std::string &LibDir,
	StringRef CandidateTriple,
	bool NeedsMultiarchSuffix = false);
	};

	GCCInstallationDetector GCCInstallation;

	mutable llvm::DenseMap<unsigned, Tool*> Tools;

	public:
	Generic_GCC(const Driver &D, const llvm::Triple& Triple);
	~Generic_GCC();

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;

	virtual bool IsUnwindTablesDefault() const;
	virtual const char *GetDefaultRelocationModel() const;
	virtual const char *GetForcedPicModel() const;

	protected:
	/// \name ToolChain Implementation Helper Functions
	/// @{

	/// \brief Check whether the target triple's architecture is 64-bits.
	bool isTarget64Bit() const {
	return (getTriple().getArch() == llvm::Triple::x86_64 \|\|
	getTriple().getArch() == llvm::Triple::ppc64);
	}
	/// \brief Check whether the target triple's architecture is 32-bits.
	/// FIXME: This should likely do more than just negate the 64-bit query.
	bool isTarget32Bit() const { return !isTarget64Bit(); }

	/// @}
	};

	class LLVM_LIBRARY_VISIBILITY Hexagon_TC : public ToolChain {
	protected:
	mutable llvm::DenseMap<unsigned, Tool*> Tools;

	public:
	Hexagon_TC(const Driver &D, const llvm::Triple& Triple);
	~Hexagon_TC();

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;

	virtual bool IsUnwindTablesDefault() const;
	virtual const char *GetDefaultRelocationModel() const;
	virtual const char *GetForcedPicModel() const;
	};

	/// Darwin - The base Darwin tool chain.
	class LLVM_LIBRARY_VISIBILITY Darwin : public ToolChain {
	public:
	/// The host version.
	unsigned DarwinVersion[3];

	private:
	mutable llvm::DenseMap<unsigned, Tool*> Tools;

	/// 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;

	// FIXME: Remove this once there is a proper way to detect an ARC runtime
	// for the simulator.
	public:
	mutable enum {
	ARCSimulator_None,
	ARCSimulator_HasARCRuntime,
	ARCSimulator_NoARCRuntime
	} ARCRuntimeForSimulator;

	mutable enum {
	LibCXXSimulator_None,
	LibCXXSimulator_NotAvailable,
	LibCXXSimulator_Available
	} LibCXXForSimulator;

	private:
	/// Whether we are targeting iPhoneOS target.
	mutable bool TargetIsIPhoneOS;

	/// Whether we are targeting the iPhoneOS simulator target.
	mutable bool TargetIsIPhoneOSSimulator;

	/// The OS version we are targeting.
	mutable unsigned TargetVersion[3];

	/// The default macosx-version-min of this tool chain; empty until
	/// initialized.
	std::string MacosxVersionMin;

	bool hasARCRuntime() const;

	private:
	void AddDeploymentTarget(DerivedArgList &Args) const;

	public:
	Darwin(const Driver &D, const llvm::Triple& Triple);
	~Darwin();

	std::string ComputeEffectiveClangTriple(const ArgList &Args,
	types::ID InputType) const;

	/// @name Darwin Specific Toolchain API
	/// {

	// FIXME: Eliminate these ...Target functions and derive separate tool chains
	// for these targets and put version in constructor.
	void setTarget(bool IsIPhoneOS, unsigned Major, unsigned Minor,
	unsigned Micro, bool IsIOSSim) const {
	assert((!IsIOSSim \|\| IsIPhoneOS) && "Unexpected deployment target!");

	// 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 && TargetIsIPhoneOS == IsIPhoneOS &&
	TargetIsIPhoneOSSimulator == IsIOSSim &&
	TargetVersion[0] == Major && TargetVersion[1] == Minor &&
	TargetVersion[2] == Micro)
	return;

	assert(!TargetInitialized && "Target already initialized!");
	TargetInitialized = true;
	TargetIsIPhoneOS = IsIPhoneOS;
	TargetIsIPhoneOSSimulator = IsIOSSim;
	TargetVersion[0] = Major;
	TargetVersion[1] = Minor;
	TargetVersion[2] = Micro;
	}

	bool isTargetIPhoneOS() const {
	assert(TargetInitialized && "Target not initialized!");
	return TargetIsIPhoneOS;
	}

	bool isTargetIOSSimulator() const {
	assert(TargetInitialized && "Target not initialized!");
	return TargetIsIPhoneOSSimulator;
	}

	bool isTargetInitialized() const { return TargetInitialized; }

	void getTargetVersion(unsigned (&Res)[3]) const {
	assert(TargetInitialized && "Target not initialized!");
	Res[0] = TargetVersion[0];
	Res[1] = TargetVersion[1];
	Res[2] = TargetVersion[2];
	}

	/// getDarwinArchName - Get the "Darwin" arch name for a particular compiler
	/// invocation. For example, Darwin treats different ARM variations as
	/// distinct architectures.
	StringRef getDarwinArchName(const ArgList &Args) const;

	static bool isVersionLT(unsigned (&A)[3], unsigned (&B)[3]) {
	for (unsigned i=0; i < 3; ++i) {
	if (A[i] > B[i]) return false;
	if (A[i] < B[i]) return true;
	}
	return false;
	}

	bool isIPhoneOSVersionLT(unsigned V0, unsigned V1=0, unsigned V2=0) const {
	assert(isTargetIPhoneOS() && "Unexpected call for OS X target!");
	unsigned B[3] = { V0, V1, V2 };
	return isVersionLT(TargetVersion, B);
	}

	bool isMacosxVersionLT(unsigned V0, unsigned V1=0, unsigned V2=0) const {
	assert(!isTargetIPhoneOS() && "Unexpected call for iPhoneOS target!");
	unsigned B[3] = { V0, V1, V2 };
	return isVersionLT(TargetVersion, B);
	}

	/// AddLinkSearchPathArgs - Add the linker search paths to \arg CmdArgs.
	///
	/// \param Args - The input argument list.
	/// \param CmdArgs [out] - The command argument list to append the paths
	/// (prefixed by -L) to.
	virtual void AddLinkSearchPathArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const = 0;

	/// AddLinkARCArgs - Add the linker arguments to link the ARC runtime library.
	virtual void AddLinkARCArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const = 0;

	/// AddLinkRuntimeLibArgs - Add the linker arguments to link the compiler
	/// runtime library.
	virtual void AddLinkRuntimeLibArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const = 0;

	/// }
	/// @name ToolChain Implementation
	/// {

	virtual types::ID LookupTypeForExtension(const char *Ext) const;

	virtual bool HasNativeLLVMSupport() const;

	virtual void configureObjCRuntime(ObjCRuntime &runtime) const;
	virtual bool hasBlocksRuntime() const;

	virtual DerivedArgList *TranslateArgs(const DerivedArgList &Args,
	const char *BoundArch) const;

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;

	virtual bool IsBlocksDefault() const {
	// Always allow blocks on Darwin; users interested in versioning are
	// expected to use /usr/include/Blocks.h.
	return true;
	}
	virtual bool IsIntegratedAssemblerDefault() const {
	#ifdef DISABLE_DEFAULT_INTEGRATED_ASSEMBLER
	return false;
	#else
	// Default integrated assembler to on for x86.
	return (getTriple().getArch() == llvm::Triple::x86 \|\|
	getTriple().getArch() == llvm::Triple::x86_64);
	#endif
	}
	virtual bool IsStrictAliasingDefault() const {
	#ifdef DISABLE_DEFAULT_STRICT_ALIASING
	return false;
	#else
	return ToolChain::IsStrictAliasingDefault();
	#endif
	}

	virtual bool IsObjCDefaultSynthPropertiesDefault() const {
	return false;
	}

	virtual bool IsObjCNonFragileABIDefault() const {
	// Non-fragile ABI is default for everything but i386.
	return getTriple().getArch() != llvm::Triple::x86;
	}
	virtual bool IsObjCLegacyDispatchDefault() const {
	// This is only used with the non-fragile ABI.

	// Legacy dispatch is used everywhere except on x86_64.
	return getTriple().getArch() != llvm::Triple::x86_64;
	}
	virtual bool UseObjCMixedDispatch() const {
	// 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 !(!isTargetIPhoneOS() && isMacosxVersionLT(10, 6));
	}
	virtual bool IsUnwindTablesDefault() const;
	virtual unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const {
	// Stack protectors default to on for user code on 10.5,
	// and for everything in 10.6 and beyond
	return isTargetIPhoneOS() \|\|
	(!isMacosxVersionLT(10, 6) \|\|
	(!isMacosxVersionLT(10, 5) && !KernelOrKext));
	}
	virtual RuntimeLibType GetDefaultRuntimeLibType() const {
	return ToolChain::RLT_CompilerRT;
	}
	virtual const char *GetDefaultRelocationModel() const;
	virtual const char *GetForcedPicModel() const;

	virtual bool SupportsProfiling() const;

	virtual bool SupportsObjCGC() const;

	virtual bool UseDwarfDebugFlags() const;

	virtual bool UseSjLjExceptions() const;

	/// }
	};

	/// DarwinClang - The Darwin toolchain used by Clang.
	class LLVM_LIBRARY_VISIBILITY DarwinClang : public Darwin {
	private:
	void AddGCCLibexecPath(unsigned darwinVersion);

	public:
	DarwinClang(const Driver &D, const llvm::Triple& Triple);

	/// @name Darwin ToolChain Implementation
	/// {

	virtual void AddLinkSearchPathArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const;

	virtual void AddLinkRuntimeLibArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const;
	void AddLinkRuntimeLib(const ArgList &Args, ArgStringList &CmdArgs,
	const char *DarwinStaticLib) const;

	virtual void AddCXXStdlibLibArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const;

	virtual void AddCCKextLibArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const;

	virtual void AddLinkARCArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const;
	/// }
	};

	/// Darwin_Generic_GCC - Generic Darwin tool chain using gcc.
	class LLVM_LIBRARY_VISIBILITY Darwin_Generic_GCC : public Generic_GCC {
	public:
	Darwin_Generic_GCC(const Driver &D, const llvm::Triple& Triple)
	: Generic_GCC(D, Triple) {}

	std::string ComputeEffectiveClangTriple(const ArgList &Args,
	types::ID InputType) const;

	virtual const char *GetDefaultRelocationModel() const { return "pic"; }
	};

	class LLVM_LIBRARY_VISIBILITY Generic_ELF : public Generic_GCC {
	virtual void anchor();
	public:
	Generic_ELF(const Driver &D, const llvm::Triple& Triple)
	: Generic_GCC(D, Triple) {}

	virtual bool IsIntegratedAssemblerDefault() const {
	// Default integrated assembler to on for x86.
	return (getTriple().getArch() == llvm::Triple::x86 \|\|
	getTriple().getArch() == llvm::Triple::x86_64);
	}
	};

	class LLVM_LIBRARY_VISIBILITY AuroraUX : public Generic_GCC {
	public:
	AuroraUX(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY OpenBSD : public Generic_ELF {
	public:
	OpenBSD(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY FreeBSD : public Generic_ELF {
	public:
	FreeBSD(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY NetBSD : public Generic_ELF {
	const llvm::Triple ToolTriple;

	public:
	NetBSD(const Driver &D, const llvm::Triple& Triple,
	const llvm::Triple& ToolTriple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY Minix : public Generic_ELF {
	public:
	Minix(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY DragonFly : public Generic_ELF {
	public:
	DragonFly(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	};

	class LLVM_LIBRARY_VISIBILITY Linux : public Generic_ELF {
	public:
	Linux(const Driver &D, const llvm::Triple& Triple);

	virtual bool HasNativeLLVMSupport() const;

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;

	virtual void AddClangSystemIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const;
	virtual void AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const;

	std::string Linker;
	std::vector<std::string> ExtraOpts;

	private:
	static bool addLibStdCXXIncludePaths(Twine Base, Twine TargetArchDir,
	const ArgList &DriverArgs,
	ArgStringList &CC1Args);
	};


	/// TCEToolChain - A tool chain using the llvm bitcode tools to perform
	/// all subcommands. See http://tce.cs.tut.fi for our peculiar target.
	class LLVM_LIBRARY_VISIBILITY TCEToolChain : public ToolChain {
	public:
	TCEToolChain(const Driver &D, const llvm::Triple& Triple);
	~TCEToolChain();

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;
	bool IsMathErrnoDefault() const;
	bool IsUnwindTablesDefault() const;
	const char* GetDefaultRelocationModel() const;
	const char* GetForcedPicModel() const;

	private:
	mutable llvm::DenseMap<unsigned, Tool*> Tools;

	};

	class LLVM_LIBRARY_VISIBILITY Windows : public ToolChain {
	mutable llvm::DenseMap<unsigned, Tool*> Tools;

	public:
	Windows(const Driver &D, const llvm::Triple& Triple);

	virtual Tool &SelectTool(const Compilation &C, const JobAction &JA,
	const ActionList &Inputs) const;

	virtual bool IsIntegratedAssemblerDefault() const;
	virtual bool IsUnwindTablesDefault() const;
	virtual const char *GetDefaultRelocationModel() const;
	virtual const char *GetForcedPicModel() const;

	virtual void AddClangSystemIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const;
	virtual void AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const;

	};

	} // end namespace toolchains
	} // end namespace driver
	} // end namespace clang

	#endif