clang/lib/Driver/ToolChains/NaCl.cpp - llvm-project - Git at Google

 //===--- NaCl.cpp - Native Client 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
 //
 //===----------------------------------------------------------------------===//

 #include "NaCl.h"
 #include "InputInfo.h"
 #include "CommonArgs.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/Path.h"

 using namespace clang::driver;
 using namespace clang::driver::tools;
 using namespace clang::driver::toolchains;
 using namespace clang;
 using namespace llvm::opt;

 // NaCl ARM assembly (inline or standalone) can be written with a set of macros
 // for the various SFI requirements like register masking. The assembly tool
 // inserts the file containing the macros as an input into all the assembly
 // jobs.
 void nacltools::AssemblerARM::ConstructJob(Compilation &C, const JobAction &JA,
                                            const InputInfo &Output,
                                            const InputInfoList &Inputs,
                                            const ArgList &Args,
                                            const char *LinkingOutput) const {
   const toolchains::NaClToolChain &ToolChain =
       static_cast<const toolchains::NaClToolChain &>(getToolChain());
   InputInfo NaClMacros(types::TY_PP_Asm, ToolChain.GetNaClArmMacrosPath(),
                        "nacl-arm-macros.s");
   InputInfoList NewInputs;
   NewInputs.push_back(NaClMacros);
   NewInputs.append(Inputs.begin(), Inputs.end());
   gnutools::Assembler::ConstructJob(C, JA, Output, NewInputs, Args,
                                     LinkingOutput);
 }

 // This is quite similar to gnutools::Linker::ConstructJob with changes that
 // we use static by default, do not yet support sanitizers or LTO, and a few
 // others. Eventually we can support more of that and hopefully migrate back
 // to gnutools::Linker.
 void nacltools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                      const InputInfo &Output,
                                      const InputInfoList &Inputs,
                                      const ArgList &Args,
                                      const char *LinkingOutput) const {

   const toolchains::NaClToolChain &ToolChain =
       static_cast<const toolchains::NaClToolChain &>(getToolChain());
   const Driver &D = ToolChain.getDriver();
   const llvm::Triple::ArchType Arch = ToolChain.getArch();
   const bool IsStatic =
       !Args.hasArg(options::OPT_dynamic) && !Args.hasArg(options::OPT_shared);

   ArgStringList CmdArgs;

   // Silence warning for "clang -g foo.o -o foo"
   Args.ClaimAllArgs(options::OPT_g_Group);
   // and "clang -emit-llvm foo.o -o foo"
   Args.ClaimAllArgs(options::OPT_emit_llvm);
   // and for "clang -w foo.o -o foo". Other warning options are already
   // handled somewhere else.
   Args.ClaimAllArgs(options::OPT_w);

   if (!D.SysRoot.empty())
     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));

   if (Args.hasArg(options::OPT_rdynamic))
     CmdArgs.push_back("-export-dynamic");

   if (Args.hasArg(options::OPT_s))
     CmdArgs.push_back("-s");

   // NaClToolChain doesn't have ExtraOpts like Linux; the only relevant flag
   // from there is --build-id, which we do want.
   CmdArgs.push_back("--build-id");

   if (!IsStatic)
     CmdArgs.push_back("--eh-frame-hdr");

   CmdArgs.push_back("-m");
   if (Arch == llvm::Triple::x86)
     CmdArgs.push_back("elf_i386_nacl");
   else if (Arch == llvm::Triple::arm)
     CmdArgs.push_back("armelf_nacl");
   else if (Arch == llvm::Triple::x86_64)
     CmdArgs.push_back("elf_x86_64_nacl");
   else if (Arch == llvm::Triple::mipsel)
     CmdArgs.push_back("mipselelf_nacl");
   else
     D.Diag(diag::err_target_unsupported_arch) << ToolChain.getArchName()
                                               << "Native Client";

   if (IsStatic)
     CmdArgs.push_back("-static");
   else if (Args.hasArg(options::OPT_shared))
     CmdArgs.push_back("-shared");

   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
     if (!Args.hasArg(options::OPT_shared))
       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));

     const char *crtbegin;
     if (IsStatic)
       crtbegin = "crtbeginT.o";
     else if (Args.hasArg(options::OPT_shared))
       crtbegin = "crtbeginS.o";
     else
       crtbegin = "crtbegin.o";
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
   }

   Args.AddAllArgs(CmdArgs, options::OPT_L);
   Args.AddAllArgs(CmdArgs, options::OPT_u);

   ToolChain.AddFilePathLibArgs(Args, CmdArgs);

   if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
     CmdArgs.push_back("--no-demangle");

   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

   if (D.CCCIsCXX() &&
       !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
     if (ToolChain.ShouldLinkCXXStdlib(Args)) {
       bool OnlyLibstdcxxStatic =
           Args.hasArg(options::OPT_static_libstdcxx) && !IsStatic;
       if (OnlyLibstdcxxStatic)
         CmdArgs.push_back("-Bstatic");
       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
       if (OnlyLibstdcxxStatic)
         CmdArgs.push_back("-Bdynamic");
     }
     CmdArgs.push_back("-lm");
   }

   if (!Args.hasArg(options::OPT_nostdlib)) {
     if (!Args.hasArg(options::OPT_nodefaultlibs)) {
       // Always use groups, since it has no effect on dynamic libraries.
       CmdArgs.push_back("--start-group");
       CmdArgs.push_back("-lc");
       // NaCl's libc++ currently requires libpthread, so just always include it
       // in the group for C++.
       if (Args.hasArg(options::OPT_pthread) ||
           Args.hasArg(options::OPT_pthreads) || D.CCCIsCXX()) {
         // Gold, used by Mips, handles nested groups differently than ld, and
         // without '-lnacl' it prefers symbols from libpthread.a over libnacl.a,
         // which is not a desired behaviour here.
         // See https://sourceware.org/ml/binutils/2015-03/msg00034.html
         if (getToolChain().getArch() == llvm::Triple::mipsel)
           CmdArgs.push_back("-lnacl");

         CmdArgs.push_back("-lpthread");
       }

       CmdArgs.push_back("-lgcc");
       CmdArgs.push_back("--as-needed");
       if (IsStatic)
         CmdArgs.push_back("-lgcc_eh");
       else
         CmdArgs.push_back("-lgcc_s");
       CmdArgs.push_back("--no-as-needed");

       // Mips needs to create and use pnacl_legacy library that contains
       // definitions from bitcode/pnaclmm.c and definitions for
       // __nacl_tp_tls_offset() and __nacl_tp_tdb_offset().
       if (getToolChain().getArch() == llvm::Triple::mipsel)
         CmdArgs.push_back("-lpnacl_legacy");

       CmdArgs.push_back("--end-group");
     }

     if (!Args.hasArg(options::OPT_nostartfiles)) {
       const char *crtend;
       if (Args.hasArg(options::OPT_shared))
         crtend = "crtendS.o";
       else
         crtend = "crtend.o";

       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
     }
   }

   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
   C.addCommand(std::make_unique<Command>(JA, *this,
                                          ResponseFileSupport::AtFileCurCP(),
                                          Exec, CmdArgs, Inputs, Output));
 }

 /// NaCl Toolchain
 NaClToolChain::NaClToolChain(const Driver &D, const llvm::Triple &Triple,
                              const ArgList &Args)
     : Generic_ELF(D, Triple, Args) {

   // Remove paths added by Generic_GCC. NaCl Toolchain cannot use the
   // default paths, and must instead only use the paths provided
   // with this toolchain based on architecture.
   path_list &file_paths = getFilePaths();
   path_list &prog_paths = getProgramPaths();

   file_paths.clear();
   prog_paths.clear();

   // Path for library files (libc.a, ...)
   std::string FilePath(getDriver().Dir + "/../");

   // Path for tools (clang, ld, etc..)
   std::string ProgPath(getDriver().Dir + "/../");

   // Path for toolchain libraries (libgcc.a, ...)
   std::string ToolPath(getDriver().ResourceDir + "/lib/");

   switch (Triple.getArch()) {
   case llvm::Triple::x86:
     file_paths.push_back(FilePath + "x86_64-nacl/lib32");
     file_paths.push_back(FilePath + "i686-nacl/usr/lib");
     prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
     file_paths.push_back(ToolPath + "i686-nacl");
     break;
   case llvm::Triple::x86_64:
     file_paths.push_back(FilePath + "x86_64-nacl/lib");
     file_paths.push_back(FilePath + "x86_64-nacl/usr/lib");
     prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
     file_paths.push_back(ToolPath + "x86_64-nacl");
     break;
   case llvm::Triple::arm:
     file_paths.push_back(FilePath + "arm-nacl/lib");
     file_paths.push_back(FilePath + "arm-nacl/usr/lib");
     prog_paths.push_back(ProgPath + "arm-nacl/bin");
     file_paths.push_back(ToolPath + "arm-nacl");
     break;
   case llvm::Triple::mipsel:
     file_paths.push_back(FilePath + "mipsel-nacl/lib");
     file_paths.push_back(FilePath + "mipsel-nacl/usr/lib");
     prog_paths.push_back(ProgPath + "bin");
     file_paths.push_back(ToolPath + "mipsel-nacl");
     break;
   default:
     break;
   }

   NaClArmMacrosPath = GetFilePath("nacl-arm-macros.s");
 }

 void NaClToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
                                               ArgStringList &CC1Args) const {
   const Driver &D = getDriver();
   if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
     return;

   if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
     SmallString<128> P(D.ResourceDir);
     llvm::sys::path::append(P, "include");
     addSystemInclude(DriverArgs, CC1Args, P.str());
   }

   if (DriverArgs.hasArg(options::OPT_nostdlibinc))
     return;

   SmallString<128> P(D.Dir + "/../");
   switch (getTriple().getArch()) {
   case llvm::Triple::x86:
     // x86 is special because multilib style uses x86_64-nacl/include for libc
     // headers but the SDK wants i686-nacl/usr/include. The other architectures
     // have the same substring.
     llvm::sys::path::append(P, "i686-nacl/usr/include");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     llvm::sys::path::remove_filename(P);
     llvm::sys::path::remove_filename(P);
     llvm::sys::path::remove_filename(P);
     llvm::sys::path::append(P, "x86_64-nacl/include");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     return;
   case llvm::Triple::arm:
     llvm::sys::path::append(P, "arm-nacl/usr/include");
     break;
   case llvm::Triple::x86_64:
     llvm::sys::path::append(P, "x86_64-nacl/usr/include");
     break;
   case llvm::Triple::mipsel:
     llvm::sys::path::append(P, "mipsel-nacl/usr/include");
     break;
   default:
     return;
   }

   addSystemInclude(DriverArgs, CC1Args, P.str());
   llvm::sys::path::remove_filename(P);
   llvm::sys::path::remove_filename(P);
   llvm::sys::path::append(P, "include");
   addSystemInclude(DriverArgs, CC1Args, P.str());
 }

 void NaClToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
                                         ArgStringList &CmdArgs) const {
   // Check for -stdlib= flags. We only support libc++ but this consumes the arg
   // if the value is libc++, and emits an error for other values.
   GetCXXStdlibType(Args);
   CmdArgs.push_back("-lc++");
 }

 void NaClToolChain::addLibCxxIncludePaths(
     const llvm::opt::ArgList &DriverArgs,
     llvm::opt::ArgStringList &CC1Args) const {
   const Driver &D = getDriver();

   SmallString<128> P(D.Dir + "/../");
   switch (getTriple().getArch()) {
   default:
     break;
   case llvm::Triple::arm:
     llvm::sys::path::append(P, "arm-nacl/include/c++/v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   case llvm::Triple::x86:
     llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   case llvm::Triple::x86_64:
     llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   case llvm::Triple::mipsel:
     llvm::sys::path::append(P, "mipsel-nacl/include/c++/v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   }
 }

 ToolChain::CXXStdlibType
 NaClToolChain::GetCXXStdlibType(const ArgList &Args) const {
   if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
     StringRef Value = A->getValue();
     if (Value == "libc++")
       return ToolChain::CST_Libcxx;
     getDriver().Diag(clang::diag::err_drv_invalid_stdlib_name)
         << A->getAsString(Args);
   }

   return ToolChain::CST_Libcxx;
 }

 std::string
 NaClToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
                                            types::ID InputType) const {
   llvm::Triple TheTriple(ComputeLLVMTriple(Args, InputType));
   if (TheTriple.getArch() == llvm::Triple::arm &&
       TheTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
     TheTriple.setEnvironment(llvm::Triple::GNUEABIHF);
   return TheTriple.getTriple();
 }

 Tool *NaClToolChain::buildLinker() const {
   return new tools::nacltools::Linker(*this);
 }

 Tool *NaClToolChain::buildAssembler() const {
   if (getTriple().getArch() == llvm::Triple::arm)
     return new tools::nacltools::AssemblerARM(*this);
   return new tools::gnutools::Assembler(*this);
 }
	//===--- NaCl.cpp - Native Client 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
	//
	//===----------------------------------------------------------------------===//

	#include "NaCl.h"
	#include "InputInfo.h"
	#include "CommonArgs.h"
	#include "clang/Driver/Compilation.h"
	#include "clang/Driver/Driver.h"
	#include "clang/Driver/DriverDiagnostic.h"
	#include "clang/Driver/Options.h"
	#include "llvm/Option/ArgList.h"
	#include "llvm/Support/Path.h"

	using namespace clang::driver;
	using namespace clang::driver::tools;
	using namespace clang::driver::toolchains;
	using namespace clang;
	using namespace llvm::opt;

	// NaCl ARM assembly (inline or standalone) can be written with a set of macros
	// for the various SFI requirements like register masking. The assembly tool
	// inserts the file containing the macros as an input into all the assembly
	// jobs.
	void nacltools::AssemblerARM::ConstructJob(Compilation &C, const JobAction &JA,
	const InputInfo &Output,
	const InputInfoList &Inputs,
	const ArgList &Args,
	const char *LinkingOutput) const {
	const toolchains::NaClToolChain &ToolChain =
	static_cast<const toolchains::NaClToolChain &>(getToolChain());
	InputInfo NaClMacros(types::TY_PP_Asm, ToolChain.GetNaClArmMacrosPath(),
	"nacl-arm-macros.s");
	InputInfoList NewInputs;
	NewInputs.push_back(NaClMacros);
	NewInputs.append(Inputs.begin(), Inputs.end());
	gnutools::Assembler::ConstructJob(C, JA, Output, NewInputs, Args,
	LinkingOutput);
	}

	// This is quite similar to gnutools::Linker::ConstructJob with changes that
	// we use static by default, do not yet support sanitizers or LTO, and a few
	// others. Eventually we can support more of that and hopefully migrate back
	// to gnutools::Linker.
	void nacltools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
	const InputInfo &Output,
	const InputInfoList &Inputs,
	const ArgList &Args,
	const char *LinkingOutput) const {

	const toolchains::NaClToolChain &ToolChain =
	static_cast<const toolchains::NaClToolChain &>(getToolChain());
	const Driver &D = ToolChain.getDriver();
	const llvm::Triple::ArchType Arch = ToolChain.getArch();
	const bool IsStatic =
	!Args.hasArg(options::OPT_dynamic) && !Args.hasArg(options::OPT_shared);

	ArgStringList CmdArgs;

	// Silence warning for "clang -g foo.o -o foo"
	Args.ClaimAllArgs(options::OPT_g_Group);
	// and "clang -emit-llvm foo.o -o foo"
	Args.ClaimAllArgs(options::OPT_emit_llvm);
	// and for "clang -w foo.o -o foo". Other warning options are already
	// handled somewhere else.
	Args.ClaimAllArgs(options::OPT_w);

	if (!D.SysRoot.empty())
	CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));

	if (Args.hasArg(options::OPT_rdynamic))
	CmdArgs.push_back("-export-dynamic");

	if (Args.hasArg(options::OPT_s))
	CmdArgs.push_back("-s");

	// NaClToolChain doesn't have ExtraOpts like Linux; the only relevant flag
	// from there is --build-id, which we do want.
	CmdArgs.push_back("--build-id");

	if (!IsStatic)
	CmdArgs.push_back("--eh-frame-hdr");

	CmdArgs.push_back("-m");
	if (Arch == llvm::Triple::x86)
	CmdArgs.push_back("elf_i386_nacl");
	else if (Arch == llvm::Triple::arm)
	CmdArgs.push_back("armelf_nacl");
	else if (Arch == llvm::Triple::x86_64)
	CmdArgs.push_back("elf_x86_64_nacl");
	else if (Arch == llvm::Triple::mipsel)
	CmdArgs.push_back("mipselelf_nacl");
	else
	D.Diag(diag::err_target_unsupported_arch) << ToolChain.getArchName()
	<< "Native Client";

	if (IsStatic)
	CmdArgs.push_back("-static");
	else if (Args.hasArg(options::OPT_shared))
	CmdArgs.push_back("-shared");

	CmdArgs.push_back("-o");
	CmdArgs.push_back(Output.getFilename());
	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
	if (!Args.hasArg(options::OPT_shared))
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));

	const char *crtbegin;
	if (IsStatic)
	crtbegin = "crtbeginT.o";
	else if (Args.hasArg(options::OPT_shared))
	crtbegin = "crtbeginS.o";
	else
	crtbegin = "crtbegin.o";
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
	}

	Args.AddAllArgs(CmdArgs, options::OPT_L);
	Args.AddAllArgs(CmdArgs, options::OPT_u);

	ToolChain.AddFilePathLibArgs(Args, CmdArgs);

	if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
	CmdArgs.push_back("--no-demangle");

	AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

	if (D.CCCIsCXX() &&
	!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
	if (ToolChain.ShouldLinkCXXStdlib(Args)) {
	bool OnlyLibstdcxxStatic =
	Args.hasArg(options::OPT_static_libstdcxx) && !IsStatic;
	if (OnlyLibstdcxxStatic)
	CmdArgs.push_back("-Bstatic");
	ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
	if (OnlyLibstdcxxStatic)
	CmdArgs.push_back("-Bdynamic");
	}
	CmdArgs.push_back("-lm");
	}

	if (!Args.hasArg(options::OPT_nostdlib)) {
	if (!Args.hasArg(options::OPT_nodefaultlibs)) {
	// Always use groups, since it has no effect on dynamic libraries.
	CmdArgs.push_back("--start-group");
	CmdArgs.push_back("-lc");
	// NaCl's libc++ currently requires libpthread, so just always include it
	// in the group for C++.
	if (Args.hasArg(options::OPT_pthread) \|\|
	Args.hasArg(options::OPT_pthreads) \|\| D.CCCIsCXX()) {
	// Gold, used by Mips, handles nested groups differently than ld, and
	// without '-lnacl' it prefers symbols from libpthread.a over libnacl.a,
	// which is not a desired behaviour here.
	// See https://sourceware.org/ml/binutils/2015-03/msg00034.html
	if (getToolChain().getArch() == llvm::Triple::mipsel)
	CmdArgs.push_back("-lnacl");

	CmdArgs.push_back("-lpthread");
	}

	CmdArgs.push_back("-lgcc");
	CmdArgs.push_back("--as-needed");
	if (IsStatic)
	CmdArgs.push_back("-lgcc_eh");
	else
	CmdArgs.push_back("-lgcc_s");
	CmdArgs.push_back("--no-as-needed");

	// Mips needs to create and use pnacl_legacy library that contains
	// definitions from bitcode/pnaclmm.c and definitions for
	// __nacl_tp_tls_offset() and __nacl_tp_tdb_offset().
	if (getToolChain().getArch() == llvm::Triple::mipsel)
	CmdArgs.push_back("-lpnacl_legacy");

	CmdArgs.push_back("--end-group");
	}

	if (!Args.hasArg(options::OPT_nostartfiles)) {
	const char *crtend;
	if (Args.hasArg(options::OPT_shared))
	crtend = "crtendS.o";
	else
	crtend = "crtend.o";

	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
	}
	}

	const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
	C.addCommand(std::make_unique<Command>(JA, *this,
	ResponseFileSupport::AtFileCurCP(),
	Exec, CmdArgs, Inputs, Output));
	}

	/// NaCl Toolchain
	NaClToolChain::NaClToolChain(const Driver &D, const llvm::Triple &Triple,
	const ArgList &Args)
	: Generic_ELF(D, Triple, Args) {

	// Remove paths added by Generic_GCC. NaCl Toolchain cannot use the
	// default paths, and must instead only use the paths provided
	// with this toolchain based on architecture.
	path_list &file_paths = getFilePaths();
	path_list &prog_paths = getProgramPaths();

	file_paths.clear();
	prog_paths.clear();

	// Path for library files (libc.a, ...)
	std::string FilePath(getDriver().Dir + "/../");

	// Path for tools (clang, ld, etc..)
	std::string ProgPath(getDriver().Dir + "/../");

	// Path for toolchain libraries (libgcc.a, ...)
	std::string ToolPath(getDriver().ResourceDir + "/lib/");

	switch (Triple.getArch()) {
	case llvm::Triple::x86:
	file_paths.push_back(FilePath + "x86_64-nacl/lib32");
	file_paths.push_back(FilePath + "i686-nacl/usr/lib");
	prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
	file_paths.push_back(ToolPath + "i686-nacl");
	break;
	case llvm::Triple::x86_64:
	file_paths.push_back(FilePath + "x86_64-nacl/lib");
	file_paths.push_back(FilePath + "x86_64-nacl/usr/lib");
	prog_paths.push_back(ProgPath + "x86_64-nacl/bin");
	file_paths.push_back(ToolPath + "x86_64-nacl");
	break;
	case llvm::Triple::arm:
	file_paths.push_back(FilePath + "arm-nacl/lib");
	file_paths.push_back(FilePath + "arm-nacl/usr/lib");
	prog_paths.push_back(ProgPath + "arm-nacl/bin");
	file_paths.push_back(ToolPath + "arm-nacl");
	break;
	case llvm::Triple::mipsel:
	file_paths.push_back(FilePath + "mipsel-nacl/lib");
	file_paths.push_back(FilePath + "mipsel-nacl/usr/lib");
	prog_paths.push_back(ProgPath + "bin");
	file_paths.push_back(ToolPath + "mipsel-nacl");
	break;
	default:
	break;
	}

	NaClArmMacrosPath = GetFilePath("nacl-arm-macros.s");
	}

	void NaClToolChain::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const {
	const Driver &D = getDriver();
	if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
	return;

	if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
	SmallString<128> P(D.ResourceDir);
	llvm::sys::path::append(P, "include");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	}

	if (DriverArgs.hasArg(options::OPT_nostdlibinc))
	return;

	SmallString<128> P(D.Dir + "/../");
	switch (getTriple().getArch()) {
	case llvm::Triple::x86:
	// x86 is special because multilib style uses x86_64-nacl/include for libc
	// headers but the SDK wants i686-nacl/usr/include. The other architectures
	// have the same substring.
	llvm::sys::path::append(P, "i686-nacl/usr/include");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	llvm::sys::path::remove_filename(P);
	llvm::sys::path::remove_filename(P);
	llvm::sys::path::remove_filename(P);
	llvm::sys::path::append(P, "x86_64-nacl/include");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	return;
	case llvm::Triple::arm:
	llvm::sys::path::append(P, "arm-nacl/usr/include");
	break;
	case llvm::Triple::x86_64:
	llvm::sys::path::append(P, "x86_64-nacl/usr/include");
	break;
	case llvm::Triple::mipsel:
	llvm::sys::path::append(P, "mipsel-nacl/usr/include");
	break;
	default:
	return;
	}

	addSystemInclude(DriverArgs, CC1Args, P.str());
	llvm::sys::path::remove_filename(P);
	llvm::sys::path::remove_filename(P);
	llvm::sys::path::append(P, "include");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	}

	void NaClToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
	ArgStringList &CmdArgs) const {
	// Check for -stdlib= flags. We only support libc++ but this consumes the arg
	// if the value is libc++, and emits an error for other values.
	GetCXXStdlibType(Args);
	CmdArgs.push_back("-lc++");
	}

	void NaClToolChain::addLibCxxIncludePaths(
	const llvm::opt::ArgList &DriverArgs,
	llvm::opt::ArgStringList &CC1Args) const {
	const Driver &D = getDriver();

	SmallString<128> P(D.Dir + "/../");
	switch (getTriple().getArch()) {
	default:
	break;
	case llvm::Triple::arm:
	llvm::sys::path::append(P, "arm-nacl/include/c++/v1");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	break;
	case llvm::Triple::x86:
	llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	break;
	case llvm::Triple::x86_64:
	llvm::sys::path::append(P, "x86_64-nacl/include/c++/v1");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	break;
	case llvm::Triple::mipsel:
	llvm::sys::path::append(P, "mipsel-nacl/include/c++/v1");
	addSystemInclude(DriverArgs, CC1Args, P.str());
	break;
	}
	}

	ToolChain::CXXStdlibType
	NaClToolChain::GetCXXStdlibType(const ArgList &Args) const {
	if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
	StringRef Value = A->getValue();
	if (Value == "libc++")
	return ToolChain::CST_Libcxx;
	getDriver().Diag(clang::diag::err_drv_invalid_stdlib_name)
	<< A->getAsString(Args);
	}

	return ToolChain::CST_Libcxx;
	}

	std::string
	NaClToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
	types::ID InputType) const {
	llvm::Triple TheTriple(ComputeLLVMTriple(Args, InputType));
	if (TheTriple.getArch() == llvm::Triple::arm &&
	TheTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
	TheTriple.setEnvironment(llvm::Triple::GNUEABIHF);
	return TheTriple.getTriple();
	}

	Tool *NaClToolChain::buildLinker() const {
	return new tools::nacltools::Linker(*this);
	}

	Tool *NaClToolChain::buildAssembler() const {
	if (getTriple().getArch() == llvm::Triple::arm)
	return new tools::nacltools::AssemblerARM(*this);
	return new tools::gnutools::Assembler(*this);
	}