C++ StringRef::lower方法代码示例

/// Adding features.
void SubtargetFeatures::AddFeature(StringRef String, bool Enable) {
  // Don't add empty features.
  if (!String.empty())
    // Convert to lowercase, prepend flag if we don't already have a flag.
    Features.push_back(hasFlag(String) ? String.lower()
                                       : (Enable ? "+" : "-") + String.lower());
}

bool MSP430AsmParser::ParseDirective(AsmToken DirectiveID) {
  StringRef IDVal = DirectiveID.getIdentifier();
  if (IDVal.lower() == ".long") {
    ParseLiteralValues(4, DirectiveID.getLoc());
  } else if (IDVal.lower() == ".word" || IDVal.lower() == ".short") {
    ParseLiteralValues(2, DirectiveID.getLoc());
  } else if (IDVal.lower() == ".byte") {
    ParseLiteralValues(1, DirectiveID.getLoc());
  } else if (IDVal.lower() == ".refsym") {
    return ParseDirectiveRefSym(DirectiveID);
  }
  return true;
}

// Resolves a library path. /nodefaultlib options are taken into
// consideration. This never returns the same path (in that case,
// it returns None).
Optional<StringRef> LinkerDriver::findLib(StringRef Filename) {
  StringRef Path = doFindLib(Filename);
  bool Seen = !VisitedFiles.insert(Path.lower()).second;
  if (Seen)
    return None;
  return Path;
}

/// Adding features.
void SubtargetFeatures::AddFeature(const StringRef String,
                                   bool IsEnabled) {
  // Don't add empty features
  if (!String.empty()) {
    // Convert to lowercase, prepend flag and add to vector
    Features.push_back(PrependFlag(String.lower(), IsEnabled));
  }
}

static bool
getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
                               const ArgList &Args,
                               std::vector<StringRef> &Features) {
  StringRef CPU;
  std::string McpuLowerCase = Mcpu.lower();
  if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features))
    return false;

  return true;
}

void Sema::actOnParamCommandDirectionArg(ParamCommandComment *Command,
                                         SourceLocation ArgLocBegin,
                                         SourceLocation ArgLocEnd,
                                         StringRef Arg) {
  ParamCommandComment::PassDirection Direction;
  std::string ArgLower = Arg.lower();
  // TODO: optimize: lower Name first (need an API in SmallString for that),
  // after that StringSwitch.
  if (ArgLower == "[in]")
    Direction = ParamCommandComment::In;
  else if (ArgLower == "[out]")
    Direction = ParamCommandComment::Out;
  else if (ArgLower == "[in,out]" || ArgLower == "[out,in]")
    Direction = ParamCommandComment::InOut;
  else {
    // Remove spaces.
    std::string::iterator O = ArgLower.begin();
    for (std::string::iterator I = ArgLower.begin(), E = ArgLower.end();
         I != E; ++I) {
      const char C = *I;
      if (C != ' ' && C != '\n' && C != '\r' &&
          C != '\t' && C != '\v' && C != '\f')
        *O++ = C;
    }
    ArgLower.resize(O - ArgLower.begin());

    bool RemovingWhitespaceHelped = false;
    if (ArgLower == "[in]") {
      Direction = ParamCommandComment::In;
      RemovingWhitespaceHelped = true;
    } else if (ArgLower == "[out]") {
      Direction = ParamCommandComment::Out;
      RemovingWhitespaceHelped = true;
    } else if (ArgLower == "[in,out]" || ArgLower == "[out,in]") {
      Direction = ParamCommandComment::InOut;
      RemovingWhitespaceHelped = true;
    } else {
      Direction = ParamCommandComment::In;
      RemovingWhitespaceHelped = false;
    }

    SourceRange ArgRange(ArgLocBegin, ArgLocEnd);
    if (RemovingWhitespaceHelped)
      Diag(ArgLocBegin, diag::warn_doc_param_spaces_in_direction)
        << ArgRange
        << FixItHint::CreateReplacement(
                          ArgRange,
                          ParamCommandComment::getDirectionAsString(Direction));
    else
      Diag(ArgLocBegin, diag::warn_doc_param_invalid_direction)
        << ArgRange;
  }
  Command->setDirection(Direction, /* Explicit = */ true);
}

static bool
getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
                                const ArgList &Args,
                                std::vector<StringRef> &Features) {
  std::string MarchLowerCase = March.lower();
  std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");

  llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first);
  if (ArchKind == llvm::AArch64::ArchKind::INVALID ||
      !llvm::AArch64::getArchFeatures(ArchKind, Features) ||
      (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)))
    return false;

  return true;
}

bool contains(const StringRef (&Array)[N], const StringRef &V,
              std::vector<StringRef> &suggestions) {
  // Compare against known values, ignoring case to avoid penalizing
  // characters with incorrect case.
  unsigned minDistance = std::numeric_limits<unsigned>::max();
  std::string lower = V.lower();
  for (const StringRef& candidate : Array) {
    if (candidate == V) {
      suggestions.clear();
      return true;
    }
    unsigned distance = StringRef(lower).edit_distance(candidate.lower());
    if (distance < minDistance) {
      suggestions.clear();
      minDistance = distance;
    }
    if (distance == minDistance)
      suggestions.emplace_back(candidate);
  }
  return false;
}

/// Adding features.
void SubtargetFeatures::AddFeature(const StringRef String) {
  // Don't add empty features or features we already have.
  if (!String.empty())
    // Convert to lowercase, prepend flag if we don't already have a flag.
    Features.push_back(hasFlag(String) ? String.str() : "+" + String.lower());
}

void x86::getX86TargetFeatures(const Driver &D, const llvm::Triple &Triple,
                               const ArgList &Args,
                               std::vector<StringRef> &Features) {
  // If -march=native, autodetect the feature list.
  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_march_EQ)) {
    if (StringRef(A->getValue()) == "native") {
      llvm::StringMap<bool> HostFeatures;
      if (llvm::sys::getHostCPUFeatures(HostFeatures))
        for (auto &F : HostFeatures)
          Features.push_back(
              Args.MakeArgString((F.second ? "+" : "-") + F.first()));
    }
  }

  if (Triple.getArchName() == "x86_64h") {
    // x86_64h implies quite a few of the more modern subtarget features
    // for Haswell class CPUs, but not all of them. Opt-out of a few.
    Features.push_back("-rdrnd");
    Features.push_back("-aes");
    Features.push_back("-pclmul");
    Features.push_back("-rtm");
    Features.push_back("-fsgsbase");
  }

  const llvm::Triple::ArchType ArchType = Triple.getArch();
  // Add features to be compatible with gcc for Android.
  if (Triple.isAndroid()) {
    if (ArchType == llvm::Triple::x86_64) {
      Features.push_back("+sse4.2");
      Features.push_back("+popcnt");
    } else
      Features.push_back("+ssse3");
  }

  // Set features according to the -arch flag on MSVC.
  if (Arg *A = Args.getLastArg(options::OPT__SLASH_arch)) {
    StringRef Arch = A->getValue();
    bool ArchUsed = false;
    // First, look for flags that are shared in x86 and x86-64.
    if (ArchType == llvm::Triple::x86_64 || ArchType == llvm::Triple::x86) {
      if (Arch == "AVX" || Arch == "AVX2") {
        ArchUsed = true;
        Features.push_back(Args.MakeArgString("+" + Arch.lower()));
      }
    }
    // Then, look for x86-specific flags.
    if (ArchType == llvm::Triple::x86) {
      if (Arch == "IA32") {
        ArchUsed = true;
      } else if (Arch == "SSE" || Arch == "SSE2") {
        ArchUsed = true;
        Features.push_back(Args.MakeArgString("+" + Arch.lower()));
      }
    }
    if (!ArchUsed)
      D.Diag(clang::diag::warn_drv_unused_argument) << A->getAsString(Args);
  }

  // Now add any that the user explicitly requested on the command line,
  // which may override the defaults.
  handleTargetFeaturesGroup(Args, Features, options::OPT_m_x86_Features_Group);
}