C++ ArgList::hasArg方法代码示例

void Cheerp::AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                           llvm::opt::ArgStringList &CC1Args) const {
  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
      DriverArgs.hasArg(options::OPT_nostdincxx))
    return;

  // Use the cheerp provided libc++
  addSystemInclude(DriverArgs, CC1Args,
		   LLVM_PREFIX "/include/c++/v1");
}

void CudaToolChain::addClangTargetOptions(
    const llvm::opt::ArgList &DriverArgs,
    llvm::opt::ArgStringList &CC1Args,
    Action::OffloadKind DeviceOffloadingKind) const {
  HostTC.addClangTargetOptions(DriverArgs, CC1Args, DeviceOffloadingKind);

  StringRef GpuArch = DriverArgs.getLastArgValue(options::OPT_march_EQ);
  assert(!GpuArch.empty() && "Must have an explicit GPU arch.");
  assert((DeviceOffloadingKind == Action::OFK_OpenMP ||
          DeviceOffloadingKind == Action::OFK_Cuda) &&
         "Only OpenMP or CUDA offloading kinds are supported for NVIDIA GPUs.");

  if (DeviceOffloadingKind == Action::OFK_Cuda) {
    CC1Args.push_back("-fcuda-is-device");

    if (DriverArgs.hasFlag(options::OPT_fcuda_flush_denormals_to_zero,
                           options::OPT_fno_cuda_flush_denormals_to_zero, false))
      CC1Args.push_back("-fcuda-flush-denormals-to-zero");

    if (DriverArgs.hasFlag(options::OPT_fcuda_approx_transcendentals,
                           options::OPT_fno_cuda_approx_transcendentals, false))
      CC1Args.push_back("-fcuda-approx-transcendentals");
  }

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

  std::string LibDeviceFile = CudaInstallation.getLibDeviceFile(GpuArch);

  if (LibDeviceFile.empty()) {
    if (DeviceOffloadingKind == Action::OFK_OpenMP &&
        DriverArgs.hasArg(options::OPT_S))
      return;

    getDriver().Diag(diag::err_drv_no_cuda_libdevice) << GpuArch;
    return;
  }

  CC1Args.push_back("-mlink-cuda-bitcode");
  CC1Args.push_back(DriverArgs.MakeArgString(LibDeviceFile));

  if (CudaInstallation.version() >= CudaVersion::CUDA_90) {
    // CUDA-9 uses new instructions that are only available in PTX6.0
    CC1Args.push_back("-target-feature");
    CC1Args.push_back("+ptx60");
  } else {
    // Libdevice in CUDA-7.0 requires PTX version that's more recent
    // than LLVM defaults to. Use PTX4.2 which is the PTX version that
    // came with CUDA-7.0.
    CC1Args.push_back("-target-feature");
    CC1Args.push_back("+ptx42");
  }
}

void CrossWindowsToolChain::
AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                          llvm::opt::ArgStringList &CC1Args) const {
    const Driver &D = getDriver();
    const std::string &SysRoot = D.SysRoot;

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

    addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
    if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
        SmallString<128> ResourceDir(D.ResourceDir);
        llvm::sys::path::append(ResourceDir, "include");
        addSystemInclude(DriverArgs, CC1Args, ResourceDir);
    }
    addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
}

void Cheerp::AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                        llvm::opt::ArgStringList &CC1Args) const {
  if (DriverArgs.hasArg(options::OPT_nostdinc))
    return;

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

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

  addExternCSystemInclude(DriverArgs, CC1Args,
		  LLVM_PREFIX "/include");
  addExternCSystemInclude(DriverArgs, CC1Args,
		  LLVM_PREFIX "/include/client");
}

void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args,
                             llvm::opt::ArgStringList &CmdArgs) const {
  if (!needsProfileRT(Args)) return;

  // Add linker option -u__llvm_runtime_variable to cause runtime
  // initialization module to be linked in.
  if (!Args.hasArg(options::OPT_coverage))
    CmdArgs.push_back(Args.MakeArgString(
        Twine("-u", llvm::getInstrProfRuntimeHookVarName())));
  ToolChain::addProfileRTLibs(Args, CmdArgs);
}

void CrossWindowsToolChain::
AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                             llvm::opt::ArgStringList &CC1Args) const {
  const llvm::Triple &Triple = getTriple();
  const std::string &SysRoot = getDriver().SysRoot;

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

  switch (GetCXXStdlibType(DriverArgs)) {
  case ToolChain::CST_Libcxx:
    addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include/c++/v1");
    break;

  case ToolChain::CST_Libstdcxx:
    addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include/c++");
    addSystemInclude(DriverArgs, CC1Args,
                     SysRoot + "/usr/include/c++/" + Triple.str());
    addSystemInclude(DriverArgs, CC1Args,
                     SysRoot + "/usr/include/c++/backwards");
  }
}

//.........这里部分代码省略.........
    Kind |= Add;
  }

  UbsanTrapOnError =
    Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
                 options::OPT_fno_sanitize_undefined_trap_on_error, false);

  // Warn about undefined sanitizer options that require runtime support.
  if (UbsanTrapOnError && notAllowedWithTrap()) {
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NotAllowedWithTrap)
      << "-fsanitize-undefined-trap-on-error";
  }

  // Only one runtime library can be used at once.
  bool NeedsAsan = needsAsanRt();
  bool NeedsTsan = needsTsanRt();
  bool NeedsMsan = needsMsanRt();
  bool NeedsLsan = needsLeakDetection();
  if (NeedsAsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsAsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsTsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsTsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsLsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsLsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  // FIXME: Currently -fsanitize=leak is silently ignored in the presence of
  // -fsanitize=address. Perhaps it should print an error, or perhaps
  // -f(-no)sanitize=leak should change whether leak detection is enabled by
  // default in ASan?

  // Parse -f(no-)sanitize-blacklist options.
  if (Arg *BLArg = Args.getLastArg(options::OPT_fsanitize_blacklist,
                                   options::OPT_fno_sanitize_blacklist)) {
    if (BLArg->getOption().matches(options::OPT_fsanitize_blacklist)) {
      std::string BLPath = BLArg->getValue();
      if (llvm::sys::fs::exists(BLPath)) {
        // Validate the blacklist format.
        std::string BLError;
        std::unique_ptr<llvm::SpecialCaseList> SCL(
            llvm::SpecialCaseList::create(BLPath, BLError));
        if (!SCL.get())
          D.Diag(diag::err_drv_malformed_sanitizer_blacklist) << BLError;
        else
          BlacklistFile = BLPath;
      } else {
        D.Diag(diag::err_drv_no_such_file) << BLPath;
      }
    }
  } else {
    // If no -fsanitize-blacklist option is specified, try to look up for
    // blacklist in the resource directory.
    std::string BLPath;
    if (getDefaultBlacklistForKind(D, Kind, BLPath) &&
        llvm::sys::fs::exists(BLPath))
      BlacklistFile = BLPath;
  }

  // Parse -f[no-]sanitize-memory-track-origins[=level] options.
  if (NeedsMsan) {
    if (Arg *A =
            Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
                            options::OPT_fsanitize_memory_track_origins,
                            options::OPT_fno_sanitize_memory_track_origins)) {
      if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
        MsanTrackOrigins = 1;
      } else if (A->getOption().matches(
                     options::OPT_fno_sanitize_memory_track_origins)) {
        MsanTrackOrigins = 0;
      } else {
        StringRef S = A->getValue();
        if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
            MsanTrackOrigins > 2) {
          D.Diag(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
        }
      }
    }
  }

  if (NeedsAsan) {
    AsanSharedRuntime =
        Args.hasArg(options::OPT_shared_libasan) ||
        (TC.getTriple().getEnvironment() == llvm::Triple::Android);
    AsanZeroBaseShadow =
        (TC.getTriple().getEnvironment() == llvm::Triple::Android);
  }
}

//.........这里部分代码省略.........
      BlacklistFiles.clear();
      ExtraDeps.clear();
    }
  }
  // Validate blacklists format.
  {
    std::string BLError;
    std::unique_ptr<llvm::SpecialCaseList> SCL(
        llvm::SpecialCaseList::create(BlacklistFiles, BLError));
    if (!SCL.get())
      D.Diag(clang::diag::err_drv_malformed_sanitizer_blacklist) << BLError;
  }

  // Parse -f[no-]sanitize-memory-track-origins[=level] options.
  if (AllAddedKinds & Memory) {
    if (Arg *A =
            Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
                            options::OPT_fsanitize_memory_track_origins,
                            options::OPT_fno_sanitize_memory_track_origins)) {
      if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
        MsanTrackOrigins = 2;
      } else if (A->getOption().matches(
                     options::OPT_fno_sanitize_memory_track_origins)) {
        MsanTrackOrigins = 0;
      } else {
        StringRef S = A->getValue();
        if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
            MsanTrackOrigins > 2) {
          D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
        }
      }
    }
    MsanUseAfterDtor =
        Args.hasArg(options::OPT_fsanitize_memory_use_after_dtor);
    NeedPIE |= !(TC.getTriple().isOSLinux() &&
                 TC.getTriple().getArch() == llvm::Triple::x86_64);
  }

  // Parse -f(no-)?sanitize-coverage flags if coverage is supported by the
  // enabled sanitizers.
  if (AllAddedKinds & SupportsCoverage) {
    for (const auto *Arg : Args) {
      if (Arg->getOption().matches(options::OPT_fsanitize_coverage)) {
        Arg->claim();
        int LegacySanitizeCoverage;
        if (Arg->getNumValues() == 1 &&
            !StringRef(Arg->getValue(0))
                 .getAsInteger(0, LegacySanitizeCoverage) &&
            LegacySanitizeCoverage >= 0 && LegacySanitizeCoverage <= 4) {
          // TODO: Add deprecation notice for this form.
          switch (LegacySanitizeCoverage) {
          case 0:
            CoverageFeatures = 0;
            break;
          case 1:
            CoverageFeatures = CoverageFunc;
            break;
          case 2:
            CoverageFeatures = CoverageBB;
            break;
          case 3:
            CoverageFeatures = CoverageEdge;
            break;
          case 4:
            CoverageFeatures = CoverageEdge | CoverageIndirCall;
            break;

CudaInstallationDetector::CudaInstallationDetector(
    const Driver &D, const llvm::Triple &HostTriple,
    const llvm::opt::ArgList &Args)
    : D(D) {
  struct Candidate {
    std::string Path;
    bool StrictChecking;

    Candidate(std::string Path, bool StrictChecking = false)
        : Path(Path), StrictChecking(StrictChecking) {}
  };
  SmallVector<Candidate, 4> Candidates;

  // In decreasing order so we prefer newer versions to older versions.
  std::initializer_list<const char *> Versions = {"8.0", "7.5", "7.0"};

  if (Args.hasArg(clang::driver::options::OPT_cuda_path_EQ)) {
    Candidates.emplace_back(
        Args.getLastArgValue(clang::driver::options::OPT_cuda_path_EQ).str());
  } else if (HostTriple.isOSWindows()) {
    for (const char *Ver : Versions)
      Candidates.emplace_back(
          D.SysRoot + "/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v" +
          Ver);
  } else {
    if (!Args.hasArg(clang::driver::options::OPT_cuda_path_ignore_env)) {
      // Try to find ptxas binary. If the executable is located in a directory
      // called 'bin/', its parent directory might be a good guess for a valid
      // CUDA installation.
      // However, some distributions might installs 'ptxas' to /usr/bin. In that
      // case the candidate would be '/usr' which passes the following checks
      // because '/usr/include' exists as well. To avoid this case, we always
      // check for the directory potentially containing files for libdevice,
      // even if the user passes -nocudalib.
      if (llvm::ErrorOr<std::string> ptxas =
              llvm::sys::findProgramByName("ptxas")) {
        SmallString<256> ptxasAbsolutePath;
        llvm::sys::fs::real_path(*ptxas, ptxasAbsolutePath);

        StringRef ptxasDir = llvm::sys::path::parent_path(ptxasAbsolutePath);
        if (llvm::sys::path::filename(ptxasDir) == "bin")
          Candidates.emplace_back(llvm::sys::path::parent_path(ptxasDir),
                                  /*StrictChecking=*/true);
      }
    }

    Candidates.emplace_back(D.SysRoot + "/usr/local/cuda");
    for (const char *Ver : Versions)
      Candidates.emplace_back(D.SysRoot + "/usr/local/cuda-" + Ver);

    if (Distro(D.getVFS()).IsDebian())
      // Special case for Debian to have nvidia-cuda-toolkit work
      // out of the box. More info on http://bugs.debian.org/882505
      Candidates.emplace_back(D.SysRoot + "/usr/lib/cuda");
  }

  bool NoCudaLib = Args.hasArg(options::OPT_nocudalib);

  for (const auto &Candidate : Candidates) {
    InstallPath = Candidate.Path;
    if (InstallPath.empty() || !D.getVFS().exists(InstallPath))
      continue;

    BinPath = InstallPath + "/bin";
    IncludePath = InstallPath + "/include";
    LibDevicePath = InstallPath + "/nvvm/libdevice";

    auto &FS = D.getVFS();
    if (!(FS.exists(IncludePath) && FS.exists(BinPath)))
      continue;
    bool CheckLibDevice = (!NoCudaLib || Candidate.StrictChecking);
    if (CheckLibDevice && !FS.exists(LibDevicePath))
      continue;

    // On Linux, we have both lib and lib64 directories, and we need to choose
    // based on our triple.  On MacOS, we have only a lib directory.
    //
    // It's sufficient for our purposes to be flexible: If both lib and lib64
    // exist, we choose whichever one matches our triple.  Otherwise, if only
    // lib exists, we use it.
    if (HostTriple.isArch64Bit() && FS.exists(InstallPath + "/lib64"))
      LibPath = InstallPath + "/lib64";
    else if (FS.exists(InstallPath + "/lib"))
      LibPath = InstallPath + "/lib";
    else
      continue;

    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> VersionFile =
        FS.getBufferForFile(InstallPath + "/version.txt");
    if (!VersionFile) {
      // CUDA 7.0 doesn't have a version.txt, so guess that's our version if
      // version.txt isn't present.
      Version = CudaVersion::CUDA_70;
    } else {
      Version = ParseCudaVersionFile((*VersionFile)->getBuffer());
    }

    if (Version >= CudaVersion::CUDA_90) {
      // CUDA-9+ uses single libdevice file for all GPU variants.
      std::string FilePath = LibDevicePath + "/libdevice.10.bc";
//.........这里部分代码省略.........

void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
                            llvm::opt::ArgStringList &CmdArgs,
                            types::ID InputType) const {
  // Translate available CoverageFeatures to corresponding clang-cc1 flags.
  // Do it even if Sanitizers.empty() since some forms of coverage don't require
  // sanitizers.
  std::pair<int, const char *> CoverageFlags[] = {
    std::make_pair(CoverageFunc, "-fsanitize-coverage-type=1"),
    std::make_pair(CoverageBB, "-fsanitize-coverage-type=2"),
    std::make_pair(CoverageEdge, "-fsanitize-coverage-type=3"),
    std::make_pair(CoverageIndirCall, "-fsanitize-coverage-indirect-calls"),
    std::make_pair(CoverageTraceBB, "-fsanitize-coverage-trace-bb"),
    std::make_pair(CoverageTraceCmp, "-fsanitize-coverage-trace-cmp"),
    std::make_pair(CoverageTraceDiv, "-fsanitize-coverage-trace-div"),
    std::make_pair(CoverageTraceGep, "-fsanitize-coverage-trace-gep"),
    std::make_pair(Coverage8bitCounters, "-fsanitize-coverage-8bit-counters"),
    std::make_pair(CoverageTracePC, "-fsanitize-coverage-trace-pc")};
  for (auto F : CoverageFlags) {
    if (CoverageFeatures & F.first)
      CmdArgs.push_back(Args.MakeArgString(F.second));
  }

  if (TC.getTriple().isOSWindows() && needsUbsanRt()) {
    // Instruct the code generator to embed linker directives in the object file
    // that cause the required runtime libraries to be linked.
    CmdArgs.push_back(Args.MakeArgString(
        "--dependent-lib=" + TC.getCompilerRT(Args, "ubsan_standalone")));
    if (types::isCXX(InputType))
      CmdArgs.push_back(Args.MakeArgString(
          "--dependent-lib=" + TC.getCompilerRT(Args, "ubsan_standalone_cxx")));
  }
  if (TC.getTriple().isOSWindows() && needsStatsRt()) {
    CmdArgs.push_back(Args.MakeArgString("--dependent-lib=" +
                                         TC.getCompilerRT(Args, "stats_client")));

    // The main executable must export the stats runtime.
    // FIXME: Only exporting from the main executable (e.g. based on whether the
    // translation unit defines main()) would save a little space, but having
    // multiple copies of the runtime shouldn't hurt.
    CmdArgs.push_back(Args.MakeArgString("--dependent-lib=" +
                                         TC.getCompilerRT(Args, "stats")));
    addIncludeLinkerOption(TC, Args, CmdArgs, "__sanitizer_stats_register");
  }

  if (Sanitizers.empty())
    return;
  CmdArgs.push_back(Args.MakeArgString("-fsanitize=" + toString(Sanitizers)));

  if (!RecoverableSanitizers.empty())
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-recover=" +
                                         toString(RecoverableSanitizers)));

  if (!TrapSanitizers.empty())
    CmdArgs.push_back(
        Args.MakeArgString("-fsanitize-trap=" + toString(TrapSanitizers)));

  for (const auto &BLPath : BlacklistFiles) {
    SmallString<64> BlacklistOpt("-fsanitize-blacklist=");
    BlacklistOpt += BLPath;
    CmdArgs.push_back(Args.MakeArgString(BlacklistOpt));
  }
  for (const auto &Dep : ExtraDeps) {
    SmallString<64> ExtraDepOpt("-fdepfile-entry=");
    ExtraDepOpt += Dep;
    CmdArgs.push_back(Args.MakeArgString(ExtraDepOpt));
  }

  if (MsanTrackOrigins)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-track-origins=" +
                                         llvm::utostr(MsanTrackOrigins)));

  if (MsanUseAfterDtor)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-use-after-dtor"));

  if (CfiCrossDso)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-cfi-cross-dso"));

  if (Stats)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-stats"));

  if (AsanFieldPadding)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-field-padding=" +
                                         llvm::utostr(AsanFieldPadding)));

  if (AsanUseAfterScope)
    CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-use-after-scope"));

  // MSan: Workaround for PR16386.
  // ASan: This is mainly to help LSan with cases such as
  // https://code.google.com/p/address-sanitizer/issues/detail?id=373
  // We can't make this conditional on -fsanitize=leak, as that flag shouldn't
  // affect compilation.
  if (Sanitizers.has(Memory) || Sanitizers.has(Address))
    CmdArgs.push_back(Args.MakeArgString("-fno-assume-sane-operator-new"));

  // Require -fvisibility= flag on non-Windows when compiling if vptr CFI is
  // enabled.
  if (Sanitizers.hasOneOf(CFIClasses) && !TC.getTriple().isOSWindows() &&
      !Args.hasArg(options::OPT_fvisibility_EQ)) {
    TC.getDriver().Diag(clang::diag::err_drv_argument_only_allowed_with)
//.........这里部分代码省略.........

bool ToolChain::ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const {
  return getDriver().CCCIsCXX() &&
         !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
                      options::OPT_nostdlibxx);
}

bool ToolChain::needsGCovInstrumentation(const llvm::opt::ArgList &Args) {
  return Args.hasFlag(options::OPT_fprofile_arcs, options::OPT_fno_profile_arcs,
                      false) ||
         Args.hasArg(options::OPT_coverage);
}

CudaInstallationDetector::CudaInstallationDetector(
    const Driver &D, const llvm::Triple &HostTriple,
    const llvm::opt::ArgList &Args)
    : D(D) {
  SmallVector<std::string, 4> CudaPathCandidates;

  // In decreasing order so we prefer newer versions to older versions.
  std::initializer_list<const char *> Versions = {"8.0", "7.5", "7.0"};

  if (Args.hasArg(clang::driver::options::OPT_cuda_path_EQ)) {
    CudaPathCandidates.push_back(
        Args.getLastArgValue(clang::driver::options::OPT_cuda_path_EQ));
  } else if (HostTriple.isOSWindows()) {
    for (const char *Ver : Versions)
      CudaPathCandidates.push_back(
          D.SysRoot + "/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v" +
          Ver);
  } else {
    CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda");
    for (const char *Ver : Versions)
      CudaPathCandidates.push_back(D.SysRoot + "/usr/local/cuda-" + Ver);
  }

  for (const auto &CudaPath : CudaPathCandidates) {
    if (CudaPath.empty() || !D.getVFS().exists(CudaPath))
      continue;

    InstallPath = CudaPath;
    BinPath = CudaPath + "/bin";
    IncludePath = InstallPath + "/include";
    LibDevicePath = InstallPath + "/nvvm/libdevice";

    auto &FS = D.getVFS();
    if (!(FS.exists(IncludePath) && FS.exists(BinPath) &&
          FS.exists(LibDevicePath)))
      continue;

    // On Linux, we have both lib and lib64 directories, and we need to choose
    // based on our triple.  On MacOS, we have only a lib directory.
    //
    // It's sufficient for our purposes to be flexible: If both lib and lib64
    // exist, we choose whichever one matches our triple.  Otherwise, if only
    // lib exists, we use it.
    if (HostTriple.isArch64Bit() && FS.exists(InstallPath + "/lib64"))
      LibPath = InstallPath + "/lib64";
    else if (FS.exists(InstallPath + "/lib"))
      LibPath = InstallPath + "/lib";
    else
      continue;

    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> VersionFile =
        FS.getBufferForFile(InstallPath + "/version.txt");
    if (!VersionFile) {
      // CUDA 7.0 doesn't have a version.txt, so guess that's our version if
      // version.txt isn't present.
      Version = CudaVersion::CUDA_70;
    } else {
      Version = ParseCudaVersionFile((*VersionFile)->getBuffer());
    }

    std::error_code EC;
    for (llvm::sys::fs::directory_iterator LI(LibDevicePath, EC), LE;
         !EC && LI != LE; LI = LI.increment(EC)) {
      StringRef FilePath = LI->path();
      StringRef FileName = llvm::sys::path::filename(FilePath);
      // Process all bitcode filenames that look like libdevice.compute_XX.YY.bc
      const StringRef LibDeviceName = "libdevice.";
      if (!(FileName.startswith(LibDeviceName) && FileName.endswith(".bc")))
        continue;
      StringRef GpuArch = FileName.slice(
          LibDeviceName.size(), FileName.find('.', LibDeviceName.size()));
      LibDeviceMap[GpuArch] = FilePath.str();
      // Insert map entries for specifc devices with this compute
      // capability. NVCC's choice of the libdevice library version is
      // rather peculiar and depends on the CUDA version.
      if (GpuArch == "compute_20") {
        LibDeviceMap["sm_20"] = FilePath;
        LibDeviceMap["sm_21"] = FilePath;
        LibDeviceMap["sm_32"] = FilePath;
      } else if (GpuArch == "compute_30") {
        LibDeviceMap["sm_30"] = FilePath;
        if (Version < CudaVersion::CUDA_80) {
          LibDeviceMap["sm_50"] = FilePath;
          LibDeviceMap["sm_52"] = FilePath;
          LibDeviceMap["sm_53"] = FilePath;
        }
        LibDeviceMap["sm_60"] = FilePath;
        LibDeviceMap["sm_61"] = FilePath;
        LibDeviceMap["sm_62"] = FilePath;
      } else if (GpuArch == "compute_35") {
        LibDeviceMap["sm_35"] = FilePath;
        LibDeviceMap["sm_37"] = FilePath;
      } else if (GpuArch == "compute_50") {
        if (Version >= CudaVersion::CUDA_80) {
          LibDeviceMap["sm_50"] = FilePath;
          LibDeviceMap["sm_52"] = FilePath;
          LibDeviceMap["sm_53"] = FilePath;
        }
      }
    }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
        << "-fsanitize-coverage=func"
        << "-fsanitize-coverage=bb";
  if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageEdge))
    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
        << "-fsanitize-coverage=func"
        << "-fsanitize-coverage=edge";
  if ((CoverageFeatures & CoverageBB) && (CoverageFeatures & CoverageEdge))
    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
        << "-fsanitize-coverage=bb"
        << "-fsanitize-coverage=edge";
  // Basic block tracing and 8-bit counters require some type of coverage
  // enabled.
  if (CoverageFeatures & CoverageTraceBB)
    D.Diag(clang::diag::warn_drv_deprecated_arg)
        << "-fsanitize-coverage=trace-bb"
        << "-fsanitize-coverage=trace-pc-guard";
  if (CoverageFeatures & Coverage8bitCounters)
    D.Diag(clang::diag::warn_drv_deprecated_arg)
        << "-fsanitize-coverage=8bit-counters"
        << "-fsanitize-coverage=trace-pc-guard";

  int InsertionPointTypes = CoverageFunc | CoverageBB | CoverageEdge;
  int InstrumentationTypes =
      CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters;
  if ((CoverageFeatures & InsertionPointTypes) &&
      !(CoverageFeatures & InstrumentationTypes)) {
    D.Diag(clang::diag::warn_drv_deprecated_arg)
        << "-fsanitize-coverage=[func|bb|edge]"
        << "-fsanitize-coverage=[func|bb|edge],[trace-pc-guard|trace-pc]";
  }

  // trace-pc w/o func/bb/edge implies edge.
  if (!(CoverageFeatures & InsertionPointTypes)) {
    if (CoverageFeatures &
        (CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters))
      CoverageFeatures |= CoverageEdge;

    if (CoverageFeatures & CoverageStackDepth)
      CoverageFeatures |= CoverageFunc;
  }

  if (AllAddedKinds & Address) {
    AsanSharedRuntime =
        Args.hasArg(options::OPT_shared_libasan) ||
        TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia();
    NeedPIE |= TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia();
    if (Arg *A =
            Args.getLastArg(options::OPT_fsanitize_address_field_padding)) {
        StringRef S = A->getValue();
        // Legal values are 0 and 1, 2, but in future we may add more levels.
        if (S.getAsInteger(0, AsanFieldPadding) || AsanFieldPadding < 0 ||
            AsanFieldPadding > 2) {
          D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
        }
    }

    if (Arg *WindowsDebugRTArg =
            Args.getLastArg(options::OPT__SLASH_MTd, options::OPT__SLASH_MT,
                            options::OPT__SLASH_MDd, options::OPT__SLASH_MD,
                            options::OPT__SLASH_LDd, options::OPT__SLASH_LD)) {
      switch (WindowsDebugRTArg->getOption().getID()) {
      case options::OPT__SLASH_MTd:
      case options::OPT__SLASH_MDd:
      case options::OPT__SLASH_LDd:
        D.Diag(clang::diag::err_drv_argument_not_allowed_with)
            << WindowsDebugRTArg->getAsString(Args)
            << lastArgumentForMask(D, Args, Address);
        D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
      }
    }

    AsanUseAfterScope = Args.hasFlag(
        options::OPT_fsanitize_address_use_after_scope,
        options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);

    // As a workaround for a bug in gold 2.26 and earlier, dead stripping of
    // globals in ASan is disabled by default on ELF targets.
    // See https://sourceware.org/bugzilla/show_bug.cgi?id=19002
    AsanGlobalsDeadStripping =
        !TC.getTriple().isOSBinFormatELF() || TC.getTriple().isOSFuchsia() ||
        Args.hasArg(options::OPT_fsanitize_address_globals_dead_stripping);
  } else {
    AsanUseAfterScope = false;
  }

  if (AllAddedKinds & SafeStack) {
    // SafeStack runtime is built into the system on Fuchsia.
    SafeStackRuntime = !TC.getTriple().isOSFuchsia();
  }

  // Parse -link-cxx-sanitizer flag.
  LinkCXXRuntimes =
      Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();

  // Finally, initialize the set of available and recoverable sanitizers.
  Sanitizers.Mask |= Kinds;
  RecoverableSanitizers.Mask |= RecoverableKinds;
  TrapSanitizers.Mask |= TrappingKinds;
}

SanitizerArgs::SanitizerArgs(const Driver &D, const llvm::opt::ArgList &Args) {
  clear();
  unsigned AllKinds = 0;  // All kinds of sanitizers that were turned on
                          // at least once (possibly, disabled further).
  for (ArgList::const_iterator I = Args.begin(), E = Args.end(); I != E; ++I) {
    unsigned Add, Remove;
    if (!parse(D, Args, *I, Add, Remove, true))
      continue;
    (*I)->claim();
    Kind |= Add;
    Kind &= ~Remove;
    AllKinds |= Add;
  }

  UbsanTrapOnError =
    Args.hasArg(options::OPT_fcatch_undefined_behavior) ||
    Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
                 options::OPT_fno_sanitize_undefined_trap_on_error, false);

  if (Args.hasArg(options::OPT_fcatch_undefined_behavior) &&
      !Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
                    options::OPT_fno_sanitize_undefined_trap_on_error, true)) {
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << "-fcatch-undefined-behavior"
      << "-fno-sanitize-undefined-trap-on-error";
  }

  // Warn about undefined sanitizer options that require runtime support.
  if (UbsanTrapOnError && notAllowedWithTrap()) {
    if (Args.hasArg(options::OPT_fcatch_undefined_behavior))
      D.Diag(diag::err_drv_argument_not_allowed_with)
        << lastArgumentForKind(D, Args, NotAllowedWithTrap)
        << "-fcatch-undefined-behavior";
    else if (Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
                          options::OPT_fno_sanitize_undefined_trap_on_error,
                          false))
      D.Diag(diag::err_drv_argument_not_allowed_with)
        << lastArgumentForKind(D, Args, NotAllowedWithTrap)
        << "-fsanitize-undefined-trap-on-error";
  }

  // Only one runtime library can be used at once.
  bool NeedsAsan = needsAsanRt();
  bool NeedsTsan = needsTsanRt();
  bool NeedsMsan = needsMsanRt();
  bool NeedsLsan = needsLeakDetection();
  if (NeedsAsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsAsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsTsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsTsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsLsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsLsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  // FIXME: Currenly -fsanitize=leak is silently ignored in the presence of
  // -fsanitize=address. Perhaps it should print an error, or perhaps
  // -f(-no)sanitize=leak should change whether leak detection is enabled by
  // default in ASan?

  // If -fsanitize contains extra features of ASan, it should also
  // explicitly contain -fsanitize=address (probably, turned off later in the
  // command line).
  if ((Kind & AddressFull) != 0 && (AllKinds & Address) == 0)
    D.Diag(diag::warn_drv_unused_sanitizer)
     << lastArgumentForKind(D, Args, AddressFull)
     << "-fsanitize=address";

  // Parse -f(no-)sanitize-blacklist options.
  if (Arg *BLArg = Args.getLastArg(options::OPT_fsanitize_blacklist,
                                   options::OPT_fno_sanitize_blacklist)) {
    if (BLArg->getOption().matches(options::OPT_fsanitize_blacklist)) {
      std::string BLPath = BLArg->getValue();
      if (llvm::sys::fs::exists(BLPath)) {
        // Validate the blacklist format.
        std::string BLError;
        llvm::OwningPtr<llvm::SpecialCaseList> SCL(
            llvm::SpecialCaseList::create(BLPath, BLError));
        if (!SCL.get())
          D.Diag(diag::err_drv_malformed_sanitizer_blacklist) << BLError;
        else
          BlacklistFile = BLPath;
      } else {
        D.Diag(diag::err_drv_no_such_file) << BLPath;
      }
    }
  } else {
    // If no -fsanitize-blacklist option is specified, try to look up for
    // blacklist in the resource directory.
//.........这里部分代码省略.........