C++ ToolChain::getEffectiveTriple方法代码示例

void tools::AddGoldPlugin(const ToolChain &ToolChain, const ArgList &Args,
                          ArgStringList &CmdArgs, bool IsThinLTO,
                          const Driver &D) {
  // Tell the linker to load the plugin. This has to come before AddLinkerInputs
  // as gold requires -plugin to come before any -plugin-opt that -Wl might
  // forward.
  CmdArgs.push_back("-plugin");

#if defined(LLVM_ON_WIN32)
  const char *Suffix = ".dll";
#elif defined(__APPLE__)
  const char *Suffix = ".dylib";
#else
  const char *Suffix = ".so";
#endif

  SmallString<1024> Plugin;
  llvm::sys::path::native(Twine(ToolChain.getDriver().Dir) +
                              "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" +
                              Suffix,
                          Plugin);
  CmdArgs.push_back(Args.MakeArgString(Plugin));

  // Try to pass driver level flags relevant to LTO code generation down to
  // the plugin.

  // Handle flags for selecting CPU variants.
  std::string CPU = getCPUName(Args, ToolChain.getTriple());
  if (!CPU.empty())
    CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=mcpu=") + CPU));

  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
    StringRef OOpt;
    if (A->getOption().matches(options::OPT_O4) ||
        A->getOption().matches(options::OPT_Ofast))
      OOpt = "3";
    else if (A->getOption().matches(options::OPT_O))
      OOpt = A->getValue();
    else if (A->getOption().matches(options::OPT_O0))
      OOpt = "0";
    if (!OOpt.empty())
      CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=O") + OOpt));
  }

  if (IsThinLTO)
    CmdArgs.push_back("-plugin-opt=thinlto");

  if (unsigned Parallelism = getLTOParallelism(Args, D))
    CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=jobs=") +
                                         llvm::to_string(Parallelism)));

  // If an explicit debugger tuning argument appeared, pass it along.
  if (Arg *A = Args.getLastArg(options::OPT_gTune_Group,
                               options::OPT_ggdbN_Group)) {
    if (A->getOption().matches(options::OPT_glldb))
      CmdArgs.push_back("-plugin-opt=-debugger-tune=lldb");
    else if (A->getOption().matches(options::OPT_gsce))
      CmdArgs.push_back("-plugin-opt=-debugger-tune=sce");
    else
      CmdArgs.push_back("-plugin-opt=-debugger-tune=gdb");
  }

  bool UseSeparateSections =
      isUseSeparateSections(ToolChain.getEffectiveTriple());

  if (Args.hasFlag(options::OPT_ffunction_sections,
                   options::OPT_fno_function_sections, UseSeparateSections)) {
    CmdArgs.push_back("-plugin-opt=-function-sections");
  }

  if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections,
                   UseSeparateSections)) {
    CmdArgs.push_back("-plugin-opt=-data-sections");
  }

  if (Arg *A = getLastProfileSampleUseArg(Args)) {
    StringRef FName = A->getValue();
    if (!llvm::sys::fs::exists(FName))
      D.Diag(diag::err_drv_no_such_file) << FName;
    else
      CmdArgs.push_back(
          Args.MakeArgString(Twine("-plugin-opt=sample-profile=") + FName));
  }

  // Need this flag to turn on new pass manager via Gold plugin.
  if (Args.hasFlag(options::OPT_fexperimental_new_pass_manager,
                   options::OPT_fno_experimental_new_pass_manager,
                   /* Default */ false)) {
    CmdArgs.push_back("-plugin-opt=new-pass-manager");
  }

}

/// Parses the various -fpic/-fPIC/-fpie/-fPIE arguments.  Then,
/// smooshes them together with platform defaults, to decide whether
/// this compile should be using PIC mode or not. Returns a tuple of
/// (RelocationModel, PICLevel, IsPIE).
std::tuple<llvm::Reloc::Model, unsigned, bool>
tools::ParsePICArgs(const ToolChain &ToolChain, const ArgList &Args) {
  const llvm::Triple &EffectiveTriple = ToolChain.getEffectiveTriple();
  const llvm::Triple &Triple = ToolChain.getTriple();

  bool PIE = ToolChain.isPIEDefault();
  bool PIC = PIE || ToolChain.isPICDefault();
  // The Darwin/MachO default to use PIC does not apply when using -static.
  if (Triple.isOSBinFormatMachO() && Args.hasArg(options::OPT_static))
    PIE = PIC = false;
  bool IsPICLevelTwo = PIC;

  bool KernelOrKext =
      Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);

  // Android-specific defaults for PIC/PIE
  if (Triple.isAndroid()) {
    switch (Triple.getArch()) {
    case llvm::Triple::arm:
    case llvm::Triple::armeb:
    case llvm::Triple::thumb:
    case llvm::Triple::thumbeb:
    case llvm::Triple::aarch64:
    case llvm::Triple::mips:
    case llvm::Triple::mipsel:
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      PIC = true; // "-fpic"
      break;

    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      PIC = true; // "-fPIC"
      IsPICLevelTwo = true;
      break;

    default:
      break;
    }
  }

  // OpenBSD-specific defaults for PIE
  if (Triple.getOS() == llvm::Triple::OpenBSD) {
    switch (ToolChain.getArch()) {
    case llvm::Triple::arm:
    case llvm::Triple::aarch64:
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
    case llvm::Triple::x86:
    case llvm::Triple::x86_64:
      IsPICLevelTwo = false; // "-fpie"
      break;

    case llvm::Triple::ppc:
    case llvm::Triple::sparc:
    case llvm::Triple::sparcel:
    case llvm::Triple::sparcv9:
      IsPICLevelTwo = true; // "-fPIE"
      break;

    default:
      break;
    }
  }

  // The last argument relating to either PIC or PIE wins, and no
  // other argument is used. If the last argument is any flavor of the
  // '-fno-...' arguments, both PIC and PIE are disabled. Any PIE
  // option implicitly enables PIC at the same level.
  Arg *LastPICArg = Args.getLastArg(options::OPT_fPIC, options::OPT_fno_PIC,
                                    options::OPT_fpic, options::OPT_fno_pic,
                                    options::OPT_fPIE, options::OPT_fno_PIE,
                                    options::OPT_fpie, options::OPT_fno_pie);
  if (Triple.isOSWindows() && LastPICArg &&
      LastPICArg ==
          Args.getLastArg(options::OPT_fPIC, options::OPT_fpic,
                          options::OPT_fPIE, options::OPT_fpie)) {
    ToolChain.getDriver().Diag(diag::err_drv_unsupported_opt_for_target)
        << LastPICArg->getSpelling() << Triple.str();
    if (Triple.getArch() == llvm::Triple::x86_64)
      return std::make_tuple(llvm::Reloc::PIC_, 2U, false);
    return std::make_tuple(llvm::Reloc::Static, 0U, false);
  }

  // Check whether the tool chain trumps the PIC-ness decision. If the PIC-ness
  // is forced, then neither PIC nor PIE flags will have no effect.
  if (!ToolChain.isPICDefaultForced()) {
    if (LastPICArg) {
      Option O = LastPICArg->getOption();
      if (O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic) ||
          O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie)) {
        PIE = O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie);
        PIC =
            PIE || O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic);
        IsPICLevelTwo =
            O.matches(options::OPT_fPIE) || O.matches(options::OPT_fPIC);
//.........这里部分代码省略.........

// Select the float ABI as determined by -msoft-float, -mhard-float, and
// -mfloat-abi=.
arm::FloatABI arm::getARMFloatABI(const ToolChain &TC, const ArgList &Args) {
  const Driver &D = TC.getDriver();
  const llvm::Triple &Triple = TC.getEffectiveTriple();
  auto SubArch = getARMSubArchVersionNumber(Triple);
  arm::FloatABI ABI = FloatABI::Invalid;
  if (Arg *A =
          Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
                          options::OPT_mfloat_abi_EQ)) {
    if (A->getOption().matches(options::OPT_msoft_float)) {
      ABI = FloatABI::Soft;
    } else if (A->getOption().matches(options::OPT_mhard_float)) {
      ABI = FloatABI::Hard;
    } else {
      ABI = llvm::StringSwitch<arm::FloatABI>(A->getValue())
                .Case("soft", FloatABI::Soft)
                .Case("softfp", FloatABI::SoftFP)
                .Case("hard", FloatABI::Hard)
                .Default(FloatABI::Invalid);
      if (ABI == FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
        D.Diag(diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
        ABI = FloatABI::Soft;
      }
    }

    // It is incorrect to select hard float ABI on MachO platforms if the ABI is
    // "apcs-gnu".
    if (Triple.isOSBinFormatMachO() && !useAAPCSForMachO(Triple) &&
        ABI == FloatABI::Hard) {
      D.Diag(diag::err_drv_unsupported_opt_for_target) << A->getAsString(Args)
                                                       << Triple.getArchName();
    }
  }

  // If unspecified, choose the default based on the platform.
  if (ABI == FloatABI::Invalid) {
    switch (Triple.getOS()) {
    case llvm::Triple::Darwin:
    case llvm::Triple::MacOSX:
    case llvm::Triple::IOS:
    case llvm::Triple::TvOS: {
      // Darwin defaults to "softfp" for v6 and v7.
      ABI = (SubArch == 6 || SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
      ABI = Triple.isWatchABI() ? FloatABI::Hard : ABI;
      break;
    }
    case llvm::Triple::WatchOS:
      ABI = FloatABI::Hard;
      break;

    // FIXME: this is invalid for WindowsCE
    case llvm::Triple::Win32:
      ABI = FloatABI::Hard;
      break;

    case llvm::Triple::NetBSD:
      switch (Triple.getEnvironment()) {
      case llvm::Triple::EABIHF:
      case llvm::Triple::GNUEABIHF:
        ABI = FloatABI::Hard;
        break;
      default:
        ABI = FloatABI::Soft;
        break;
      }
      break;

    case llvm::Triple::FreeBSD:
      switch (Triple.getEnvironment()) {
      case llvm::Triple::GNUEABIHF:
        ABI = FloatABI::Hard;
        break;
      default:
        // FreeBSD defaults to soft float
        ABI = FloatABI::Soft;
        break;
      }
      break;

    case llvm::Triple::OpenBSD:
      ABI = FloatABI::Soft;
      break;

    default:
      switch (Triple.getEnvironment()) {
      case llvm::Triple::GNUEABIHF:
      case llvm::Triple::MuslEABIHF:
      case llvm::Triple::EABIHF:
        ABI = FloatABI::Hard;
        break;
      case llvm::Triple::GNUEABI:
      case llvm::Triple::MuslEABI:
      case llvm::Triple::EABI:
        // EABI is always AAPCS, and if it was not marked 'hard', it's softfp
        ABI = FloatABI::SoftFP;
        break;
      case llvm::Triple::Android:
        ABI = (SubArch == 7) ? FloatABI::SoftFP : FloatABI::Soft;
        break;
//.........这里部分代码省略.........