lib/Driver/HostInfo.cpp - platform/external/clang - Gitiles

 //===--- HostInfo.cpp - Host specific information -------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #include "clang/Driver/HostInfo.h"

 #include "clang/Driver/Arg.h"
 #include "clang/Driver/ArgList.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Option.h"
 #include "clang/Driver/Options.h"

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

 #include "ToolChains.h"

 #include <cassert>

 using namespace clang::driver;

 HostInfo::HostInfo(const Driver &D, const llvm::Triple &_Triple)
   : TheDriver(D), Triple(_Triple) {
 }

 HostInfo::~HostInfo() {
 }

 namespace {

 // Darwin Host Info

 /// DarwinHostInfo - Darwin host information implementation.
 class DarwinHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::DenseMap<unsigned, ToolChain*> ToolChains;

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

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 DarwinHostInfo::DarwinHostInfo(const Driver &D, const llvm::Triple& Triple)
   : HostInfo(D, Triple) {
 }

 DarwinHostInfo::~DarwinHostInfo() {
   for (llvm::DenseMap<unsigned, ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool DarwinHostInfo::useDriverDriver() const {
   return true;
 }

 ToolChain *DarwinHostInfo::CreateToolChain(const ArgList &Args,
                                            const char *ArchName) const {
   llvm::Triple::ArchType Arch;

   if (!ArchName) {
     // If we aren't looking for a specific arch, infer the default architecture
     // based on -arch and -m32/-m64 command line options.
     if (Arg *A = Args.getLastArg(options::OPT_arch)) {
       // The gcc driver behavior with multiple -arch flags wasn't consistent for
       // things which rely on a default architecture. We just use the last -arch
       // to find the default tool chain (assuming it is valid).
       Arch = llvm::Triple::getArchTypeForDarwinArchName(A->getValue(Args));

       // If it was invalid just use the host, we will reject this command line
       // later.
       if (Arch == llvm::Triple::UnknownArch)
         Arch = getTriple().getArch();
     } else {
       // Otherwise default to the arch of the host.
       Arch = getTriple().getArch();
     }

     // Honor -m32 and -m64 when finding the default tool chain.
     //
     // FIXME: Should this information be in llvm::Triple?
     if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
       if (A->getOption().matches(options::OPT_m32)) {
         if (Arch == llvm::Triple::x86_64)
           Arch = llvm::Triple::x86;
         if (Arch == llvm::Triple::ppc64)
           Arch = llvm::Triple::ppc;
       } else {
         if (Arch == llvm::Triple::x86)
           Arch = llvm::Triple::x86_64;
         if (Arch == llvm::Triple::ppc)
           Arch = llvm::Triple::ppc64;
       }
     }
   } else
     Arch = llvm::Triple::getArchTypeForDarwinArchName(ArchName);

   assert(Arch != llvm::Triple::UnknownArch && "Unexpected arch!");
   ToolChain *&TC = ToolChains[Arch];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArch(Arch);

     // If we recognized the arch, match it to the toolchains we support.
     if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64 ||
         Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) {
       TC = new toolchains::DarwinClang(*this, TCTriple);
     } else
       TC = new toolchains::Darwin_Generic_GCC(*this, TCTriple);
   }

   return TC;
 }

 // TCE Host Info

 /// TCEHostInfo - TCE host information implementation (see http://tce.cs.tut.fi)
 class TCEHostInfo : public HostInfo {

 public:
   TCEHostInfo(const Driver &D, const llvm::Triple &Triple);
   ~TCEHostInfo() {}

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 TCEHostInfo::TCEHostInfo(const Driver &D, const llvm::Triple& Triple)
   : HostInfo(D, Triple) {
 }

 bool TCEHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *TCEHostInfo::CreateToolChain(const ArgList &Args,
                                         const char *ArchName) const {
   llvm::Triple TCTriple(getTriple());
 //  TCTriple.setArchName(ArchName);
   return new toolchains::TCEToolChain(*this, TCTriple);
 }


 // Unknown Host Info

 /// UnknownHostInfo - Generic host information to use for unknown hosts.
 class UnknownHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

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

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 UnknownHostInfo::UnknownHostInfo(const Driver &D, const llvm::Triple& Triple)
   : HostInfo(D, Triple) {
 }

 UnknownHostInfo::~UnknownHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool UnknownHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *UnknownHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver support.");

   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();
   ArchName = Arch.c_str();
   if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
     if (Triple.getArch() == llvm::Triple::x86 ||
         Triple.getArch() == llvm::Triple::x86_64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
     } else if (Triple.getArch() == llvm::Triple::ppc ||
                Triple.getArch() == llvm::Triple::ppc64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
     }
   }

   ToolChain *&TC = ToolChains[ArchName];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::Generic_GCC(*this, TCTriple);
   }

   return TC;
 }

 // OpenBSD Host Info

 /// OpenBSDHostInfo -  OpenBSD host information implementation.
 class OpenBSDHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   OpenBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~OpenBSDHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 OpenBSDHostInfo::~OpenBSDHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool OpenBSDHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *OpenBSDHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   std::string Arch = getArchName();
   ArchName = Arch.c_str();

   ToolChain *&TC = ToolChains[ArchName];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::OpenBSD(*this, TCTriple);
   }

   return TC;
 }

 // AuroraUX Host Info

 /// AuroraUXHostInfo - AuroraUX host information implementation.
 class AuroraUXHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   AuroraUXHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~AuroraUXHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 AuroraUXHostInfo::~AuroraUXHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool AuroraUXHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *AuroraUXHostInfo::CreateToolChain(const ArgList &Args,
                                              const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   ToolChain *&TC = ToolChains[getArchName()];

   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(getArchName());

     TC = new toolchains::AuroraUX(*this, TCTriple);
   }

   return TC;
 }

 // FreeBSD Host Info

 /// FreeBSDHostInfo -  FreeBSD host information implementation.
 class FreeBSDHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   FreeBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~FreeBSDHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 FreeBSDHostInfo::~FreeBSDHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool FreeBSDHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *FreeBSDHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();
   ArchName = Arch.c_str();
   if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
     if (Triple.getArch() == llvm::Triple::x86 ||
         Triple.getArch() == llvm::Triple::x86_64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
     } else if (Triple.getArch() == llvm::Triple::ppc ||
                Triple.getArch() == llvm::Triple::ppc64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
     }
   }

   ToolChain *&TC = ToolChains[ArchName];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::FreeBSD(*this, TCTriple);
   }

   return TC;
 }

 // NetBSD Host Info

 /// NetBSDHostInfo -  NetBSD host information implementation.
 class NetBSDHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   NetBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~NetBSDHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 NetBSDHostInfo::~NetBSDHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool NetBSDHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *NetBSDHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();
   ArchName = Arch.c_str();
   if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
     if (Triple.getArch() == llvm::Triple::x86 ||
         Triple.getArch() == llvm::Triple::x86_64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
     } else if (Triple.getArch() == llvm::Triple::ppc ||
                Triple.getArch() == llvm::Triple::ppc64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
     }
   }
   llvm::Triple TargetTriple(getTriple());
   TargetTriple.setArchName(ArchName);

   ToolChain *TC;

   // XXX Cache toolchain even if -m32 is used
   if (Arch == ArchName) {
     TC = ToolChains[ArchName];
     if (TC)
       return TC;
   }

   TC = new toolchains::NetBSD(*this, TargetTriple, getTriple());

   return TC;
 }

 // Minix Host Info

 /// MinixHostInfo -  Minix host information implementation.
 class MinixHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   MinixHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~MinixHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 MinixHostInfo::~MinixHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it){
     delete it->second;
   }
 }

 bool MinixHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *MinixHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   std::string Arch = getArchName();
   ArchName = Arch.c_str();

   ToolChain *&TC = ToolChains[ArchName];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::Minix(*this, TCTriple);
   }

   return TC;
 }

 // DragonFly Host Info

 /// DragonFlyHostInfo -  DragonFly host information implementation.
 class DragonFlyHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   DragonFlyHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~DragonFlyHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 DragonFlyHostInfo::~DragonFlyHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool DragonFlyHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *DragonFlyHostInfo::CreateToolChain(const ArgList &Args,
                                               const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   ToolChain *&TC = ToolChains[getArchName()];

   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(getArchName());

     TC = new toolchains::DragonFly(*this, TCTriple);
   }

   return TC;
 }

 // Linux Host Info

 /// LinuxHostInfo -  Linux host information implementation.
 class LinuxHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

 public:
   LinuxHostInfo(const Driver &D, const llvm::Triple& Triple)
     : HostInfo(D, Triple) {}
   ~LinuxHostInfo();

   virtual bool useDriverDriver() const;

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 LinuxHostInfo::~LinuxHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool LinuxHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *LinuxHostInfo::CreateToolChain(const ArgList &Args,
                                           const char *ArchName) const {

   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();
   ArchName = Arch.c_str();
   if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
     if (Triple.getArch() == llvm::Triple::x86 ||
         Triple.getArch() == llvm::Triple::x86_64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
     } else if (Triple.getArch() == llvm::Triple::ppc ||
                Triple.getArch() == llvm::Triple::ppc64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
     }
   }

   ToolChain *&TC = ToolChains[ArchName];

   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::Linux(*this, TCTriple);
   }

   return TC;
 }

 // Windows Host Info

 /// WindowsHostInfo - Host information to use on Microsoft Windows.
 class WindowsHostInfo : public HostInfo {
   /// Cache of tool chains we have created.
   mutable llvm::StringMap<ToolChain*> ToolChains;

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

   virtual bool useDriverDriver() const;

   virtual types::ID lookupTypeForExtension(const char *Ext) const {
     return types::lookupTypeForExtension(Ext);
   }

   virtual ToolChain *CreateToolChain(const ArgList &Args,
                                      const char *ArchName) const;
 };

 WindowsHostInfo::WindowsHostInfo(const Driver &D, const llvm::Triple& Triple)
   : HostInfo(D, Triple) {
 }

 WindowsHostInfo::~WindowsHostInfo() {
   for (llvm::StringMap<ToolChain*>::iterator
          it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
     delete it->second;
 }

 bool WindowsHostInfo::useDriverDriver() const {
   return false;
 }

 ToolChain *WindowsHostInfo::CreateToolChain(const ArgList &Args,
                                             const char *ArchName) const {
   assert(!ArchName &&
          "Unexpected arch name on platform without driver driver support.");

   // Automatically handle some instances of -m32/-m64 we know about.
   std::string Arch = getArchName();
   ArchName = Arch.c_str();
   if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
     if (Triple.getArch() == llvm::Triple::x86 ||
         Triple.getArch() == llvm::Triple::x86_64) {
       ArchName =
         (A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
     }
   }

   ToolChain *&TC = ToolChains[ArchName];
   if (!TC) {
     llvm::Triple TCTriple(getTriple());
     TCTriple.setArchName(ArchName);

     TC = new toolchains::Windows(*this, TCTriple);
   }

   return TC;
 }

 // FIXME: This is a placeholder.
 class MinGWHostInfo : public UnknownHostInfo {
 public:
   MinGWHostInfo(const Driver &D, const llvm::Triple& Triple);
 };

 MinGWHostInfo::MinGWHostInfo(const Driver &D, const llvm::Triple& Triple)
   : UnknownHostInfo(D, Triple) {}

 } // end anon namespace

 const HostInfo *
 clang::driver::createAuroraUXHostInfo(const Driver &D,
                                       const llvm::Triple& Triple){
   return new AuroraUXHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createDarwinHostInfo(const Driver &D,
                                     const llvm::Triple& Triple){
   return new DarwinHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createOpenBSDHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new OpenBSDHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createFreeBSDHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new FreeBSDHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createNetBSDHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new NetBSDHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createMinixHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new MinixHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createDragonFlyHostInfo(const Driver &D,
                                        const llvm::Triple& Triple) {
   return new DragonFlyHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createLinuxHostInfo(const Driver &D,
                                    const llvm::Triple& Triple) {
   return new LinuxHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createTCEHostInfo(const Driver &D,
                                    const llvm::Triple& Triple) {
   return new TCEHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createWindowsHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new WindowsHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createMinGWHostInfo(const Driver &D,
                                    const llvm::Triple& Triple) {
   return new MinGWHostInfo(D, Triple);
 }

 const HostInfo *
 clang::driver::createUnknownHostInfo(const Driver &D,
                                      const llvm::Triple& Triple) {
   return new UnknownHostInfo(D, Triple);
 }
	//===--- HostInfo.cpp - Host specific information -------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#include "clang/Driver/HostInfo.h"

	#include "clang/Driver/Arg.h"
	#include "clang/Driver/ArgList.h"
	#include "clang/Driver/Driver.h"
	#include "clang/Driver/DriverDiagnostic.h"
	#include "clang/Driver/Option.h"
	#include "clang/Driver/Options.h"

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

	#include "ToolChains.h"

	#include <cassert>

	using namespace clang::driver;

	HostInfo::HostInfo(const Driver &D, const llvm::Triple &_Triple)
	: TheDriver(D), Triple(_Triple) {
	}

	HostInfo::~HostInfo() {
	}

	namespace {

	// Darwin Host Info

	/// DarwinHostInfo - Darwin host information implementation.
	class DarwinHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::DenseMap<unsigned, ToolChain*> ToolChains;

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

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	DarwinHostInfo::DarwinHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {
	}

	DarwinHostInfo::~DarwinHostInfo() {
	for (llvm::DenseMap<unsigned, ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool DarwinHostInfo::useDriverDriver() const {
	return true;
	}

	ToolChain *DarwinHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	llvm::Triple::ArchType Arch;

	if (!ArchName) {
	// If we aren't looking for a specific arch, infer the default architecture
	// based on -arch and -m32/-m64 command line options.
	if (Arg *A = Args.getLastArg(options::OPT_arch)) {
	// The gcc driver behavior with multiple -arch flags wasn't consistent for
	// things which rely on a default architecture. We just use the last -arch
	// to find the default tool chain (assuming it is valid).
	Arch = llvm::Triple::getArchTypeForDarwinArchName(A->getValue(Args));

	// If it was invalid just use the host, we will reject this command line
	// later.
	if (Arch == llvm::Triple::UnknownArch)
	Arch = getTriple().getArch();
	} else {
	// Otherwise default to the arch of the host.
	Arch = getTriple().getArch();
	}

	// Honor -m32 and -m64 when finding the default tool chain.
	//
	// FIXME: Should this information be in llvm::Triple?
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (A->getOption().matches(options::OPT_m32)) {
	if (Arch == llvm::Triple::x86_64)
	Arch = llvm::Triple::x86;
	if (Arch == llvm::Triple::ppc64)
	Arch = llvm::Triple::ppc;
	} else {
	if (Arch == llvm::Triple::x86)
	Arch = llvm::Triple::x86_64;
	if (Arch == llvm::Triple::ppc)
	Arch = llvm::Triple::ppc64;
	}
	}
	} else
	Arch = llvm::Triple::getArchTypeForDarwinArchName(ArchName);

	assert(Arch != llvm::Triple::UnknownArch && "Unexpected arch!");
	ToolChain *&TC = ToolChains[Arch];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArch(Arch);

	// If we recognized the arch, match it to the toolchains we support.
	if (Arch == llvm::Triple::x86 \|\| Arch == llvm::Triple::x86_64 \|\|
	Arch == llvm::Triple::arm \|\| Arch == llvm::Triple::thumb) {
	TC = new toolchains::DarwinClang(*this, TCTriple);
	} else
	TC = new toolchains::Darwin_Generic_GCC(*this, TCTriple);
	}

	return TC;
	}

	// TCE Host Info

	/// TCEHostInfo - TCE host information implementation (see http://tce.cs.tut.fi)
	class TCEHostInfo : public HostInfo {

	public:
	TCEHostInfo(const Driver &D, const llvm::Triple &Triple);
	~TCEHostInfo() {}

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	TCEHostInfo::TCEHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {
	}

	bool TCEHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *TCEHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	llvm::Triple TCTriple(getTriple());
	// TCTriple.setArchName(ArchName);
	return new toolchains::TCEToolChain(*this, TCTriple);
	}


	// Unknown Host Info

	/// UnknownHostInfo - Generic host information to use for unknown hosts.
	class UnknownHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

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

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	UnknownHostInfo::UnknownHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {
	}

	UnknownHostInfo::~UnknownHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool UnknownHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *UnknownHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver support.");

	// Automatically handle some instances of -m32/-m64 we know about.
	std::string Arch = getArchName();
	ArchName = Arch.c_str();
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (Triple.getArch() == llvm::Triple::x86 \|\|
	Triple.getArch() == llvm::Triple::x86_64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
	} else if (Triple.getArch() == llvm::Triple::ppc \|\|
	Triple.getArch() == llvm::Triple::ppc64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
	}
	}

	ToolChain *&TC = ToolChains[ArchName];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::Generic_GCC(*this, TCTriple);
	}

	return TC;
	}

	// OpenBSD Host Info

	/// OpenBSDHostInfo - OpenBSD host information implementation.
	class OpenBSDHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	OpenBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~OpenBSDHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	OpenBSDHostInfo::~OpenBSDHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool OpenBSDHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *OpenBSDHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	std::string Arch = getArchName();
	ArchName = Arch.c_str();

	ToolChain *&TC = ToolChains[ArchName];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::OpenBSD(*this, TCTriple);
	}

	return TC;
	}

	// AuroraUX Host Info

	/// AuroraUXHostInfo - AuroraUX host information implementation.
	class AuroraUXHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	AuroraUXHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~AuroraUXHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	AuroraUXHostInfo::~AuroraUXHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool AuroraUXHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *AuroraUXHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	ToolChain *&TC = ToolChains[getArchName()];

	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(getArchName());

	TC = new toolchains::AuroraUX(*this, TCTriple);
	}

	return TC;
	}

	// FreeBSD Host Info

	/// FreeBSDHostInfo - FreeBSD host information implementation.
	class FreeBSDHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	FreeBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~FreeBSDHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	FreeBSDHostInfo::~FreeBSDHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool FreeBSDHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *FreeBSDHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	// Automatically handle some instances of -m32/-m64 we know about.
	std::string Arch = getArchName();
	ArchName = Arch.c_str();
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (Triple.getArch() == llvm::Triple::x86 \|\|
	Triple.getArch() == llvm::Triple::x86_64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
	} else if (Triple.getArch() == llvm::Triple::ppc \|\|
	Triple.getArch() == llvm::Triple::ppc64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
	}
	}

	ToolChain *&TC = ToolChains[ArchName];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::FreeBSD(*this, TCTriple);
	}

	return TC;
	}

	// NetBSD Host Info

	/// NetBSDHostInfo - NetBSD host information implementation.
	class NetBSDHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	NetBSDHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~NetBSDHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	NetBSDHostInfo::~NetBSDHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool NetBSDHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *NetBSDHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	// Automatically handle some instances of -m32/-m64 we know about.
	std::string Arch = getArchName();
	ArchName = Arch.c_str();
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (Triple.getArch() == llvm::Triple::x86 \|\|
	Triple.getArch() == llvm::Triple::x86_64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
	} else if (Triple.getArch() == llvm::Triple::ppc \|\|
	Triple.getArch() == llvm::Triple::ppc64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
	}
	}
	llvm::Triple TargetTriple(getTriple());
	TargetTriple.setArchName(ArchName);

	ToolChain *TC;

	// XXX Cache toolchain even if -m32 is used
	if (Arch == ArchName) {
	TC = ToolChains[ArchName];
	if (TC)
	return TC;
	}

	TC = new toolchains::NetBSD(*this, TargetTriple, getTriple());

	return TC;
	}

	// Minix Host Info

	/// MinixHostInfo - Minix host information implementation.
	class MinixHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	MinixHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~MinixHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	MinixHostInfo::~MinixHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it){
	delete it->second;
	}
	}

	bool MinixHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *MinixHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	std::string Arch = getArchName();
	ArchName = Arch.c_str();

	ToolChain *&TC = ToolChains[ArchName];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::Minix(*this, TCTriple);
	}

	return TC;
	}

	// DragonFly Host Info

	/// DragonFlyHostInfo - DragonFly host information implementation.
	class DragonFlyHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	DragonFlyHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~DragonFlyHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	DragonFlyHostInfo::~DragonFlyHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool DragonFlyHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *DragonFlyHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	ToolChain *&TC = ToolChains[getArchName()];

	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(getArchName());

	TC = new toolchains::DragonFly(*this, TCTriple);
	}

	return TC;
	}

	// Linux Host Info

	/// LinuxHostInfo - Linux host information implementation.
	class LinuxHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

	public:
	LinuxHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {}
	~LinuxHostInfo();

	virtual bool useDriverDriver() const;

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	LinuxHostInfo::~LinuxHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool LinuxHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *LinuxHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {

	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	// Automatically handle some instances of -m32/-m64 we know about.
	std::string Arch = getArchName();
	ArchName = Arch.c_str();
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (Triple.getArch() == llvm::Triple::x86 \|\|
	Triple.getArch() == llvm::Triple::x86_64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
	} else if (Triple.getArch() == llvm::Triple::ppc \|\|
	Triple.getArch() == llvm::Triple::ppc64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "powerpc" : "powerpc64";
	}
	}

	ToolChain *&TC = ToolChains[ArchName];

	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::Linux(*this, TCTriple);
	}

	return TC;
	}

	// Windows Host Info

	/// WindowsHostInfo - Host information to use on Microsoft Windows.
	class WindowsHostInfo : public HostInfo {
	/// Cache of tool chains we have created.
	mutable llvm::StringMap<ToolChain*> ToolChains;

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

	virtual bool useDriverDriver() const;

	virtual types::ID lookupTypeForExtension(const char *Ext) const {
	return types::lookupTypeForExtension(Ext);
	}

	virtual ToolChain *CreateToolChain(const ArgList &Args,
	const char *ArchName) const;
	};

	WindowsHostInfo::WindowsHostInfo(const Driver &D, const llvm::Triple& Triple)
	: HostInfo(D, Triple) {
	}

	WindowsHostInfo::~WindowsHostInfo() {
	for (llvm::StringMap<ToolChain*>::iterator
	it = ToolChains.begin(), ie = ToolChains.end(); it != ie; ++it)
	delete it->second;
	}

	bool WindowsHostInfo::useDriverDriver() const {
	return false;
	}

	ToolChain *WindowsHostInfo::CreateToolChain(const ArgList &Args,
	const char *ArchName) const {
	assert(!ArchName &&
	"Unexpected arch name on platform without driver driver support.");

	// Automatically handle some instances of -m32/-m64 we know about.
	std::string Arch = getArchName();
	ArchName = Arch.c_str();
	if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
	if (Triple.getArch() == llvm::Triple::x86 \|\|
	Triple.getArch() == llvm::Triple::x86_64) {
	ArchName =
	(A->getOption().matches(options::OPT_m32)) ? "i386" : "x86_64";
	}
	}

	ToolChain *&TC = ToolChains[ArchName];
	if (!TC) {
	llvm::Triple TCTriple(getTriple());
	TCTriple.setArchName(ArchName);

	TC = new toolchains::Windows(*this, TCTriple);
	}

	return TC;
	}

	// FIXME: This is a placeholder.
	class MinGWHostInfo : public UnknownHostInfo {
	public:
	MinGWHostInfo(const Driver &D, const llvm::Triple& Triple);
	};

	MinGWHostInfo::MinGWHostInfo(const Driver &D, const llvm::Triple& Triple)
	: UnknownHostInfo(D, Triple) {}

	} // end anon namespace

	const HostInfo *
	clang::driver::createAuroraUXHostInfo(const Driver &D,
	const llvm::Triple& Triple){
	return new AuroraUXHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createDarwinHostInfo(const Driver &D,
	const llvm::Triple& Triple){
	return new DarwinHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createOpenBSDHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new OpenBSDHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createFreeBSDHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new FreeBSDHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createNetBSDHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new NetBSDHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createMinixHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new MinixHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createDragonFlyHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new DragonFlyHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createLinuxHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new LinuxHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createTCEHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new TCEHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createWindowsHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new WindowsHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createMinGWHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new MinGWHostInfo(D, Triple);
	}

	const HostInfo *
	clang::driver::createUnknownHostInfo(const Driver &D,
	const llvm::Triple& Triple) {
	return new UnknownHostInfo(D, Triple);
	}