C++ ASTContext::getTargetInfo方法代码示例

bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
                         bool AllowOnUnknownClass) {
  if (!Ctx.getLangOpts().ObjCWeakRuntime)
    return false;

  QualType T = type;
  if (T.isNull())
    return false;

  // iOS is always safe to use 'weak'.
  if (Ctx.getTargetInfo().getTriple().isiOS() ||
      Ctx.getTargetInfo().getTriple().isWatchOS())
    AllowOnUnknownClass = true;

  while (const PointerType *ptr = T->getAs<PointerType>())
    T = ptr->getPointeeType();
  if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
    ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
    if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject"))
      return false; // id/NSObject is not safe for weak.
    if (!AllowOnUnknownClass && !Class->hasDefinition())
      return false; // forward classes are not verifiable, therefore not safe.
    if (Class && Class->isArcWeakrefUnavailable())
      return false;
  }

  return true;
}

    void Initialize(ASTContext &Context) override {
      Ctx = &Context;

      M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
      M->setDataLayout(Ctx->getTargetInfo().getTargetDescription());
      TD.reset(new llvm::DataLayout(Ctx->getTargetInfo().getTargetDescription()));
      Builder.reset(new CodeGen::CodeGenModule(Context, CodeGenOpts, *M, *TD,
                                               Diags));

      for (size_t i = 0, e = CodeGenOpts.DependentLibraries.size(); i < e; ++i)
        HandleDependentLibrary(CodeGenOpts.DependentLibraries[i]);
    }

static CCMangling getCallingConvMangling(const ASTContext &Context,
                                         const NamedDecl *ND) {
  const TargetInfo &TI = Context.getTargetInfo();
  const llvm::Triple &Triple = TI.getTriple();
  if (!Triple.isOSWindows() ||
      !(Triple.getArch() == llvm::Triple::x86 ||
        Triple.getArch() == llvm::Triple::x86_64))
    return CCM_Other;

  if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
      TI.getCXXABI() == TargetCXXABI::Microsoft)
    return CCM_Other;

  const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
  if (!FD)
    return CCM_Other;
  QualType T = FD->getType();

  const FunctionType *FT = T->castAs<FunctionType>();

  CallingConv CC = FT->getCallConv();
  switch (CC) {
  default:
    return CCM_Other;
  case CC_X86FastCall:
    return CCM_Fast;
  case CC_X86StdCall:
    return CCM_Std;
  case CC_X86VectorCall:
    return CCM_Vector;
  }
}

CodeGenTypes::CodeGenTypes(ASTContext &Ctx, llvm::Module& M,
                           const llvm::TargetData &TD, const ABIInfo &Info,
                           CGCXXABI &CXXABI, const CodeGenOptions &CGO)
  : Context(Ctx), Target(Ctx.getTargetInfo()), TheModule(M), TheTargetData(TD),
    TheABIInfo(Info), TheCXXABI(CXXABI), CodeGenOpts(CGO) {
  SkippedLayout = false;
}

static StdOrFastCC getStdOrFastCallMangling(const ASTContext &Context,
                                            const NamedDecl *ND) {
  const TargetInfo &TI = Context.getTargetInfo();
  llvm::Triple Triple = TI.getTriple();
  if (!Triple.isOSWindows() || Triple.getArch() != llvm::Triple::x86)
    return SOF_OTHER;

  if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
      TI.getCXXABI() == TargetCXXABI::Microsoft)
    return SOF_OTHER;

  const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
  if (!FD)
    return SOF_OTHER;
  QualType T = FD->getType();

  const FunctionType *FT = T->castAs<FunctionType>();

  CallingConv CC = FT->getCallConv();
  switch (CC) {
  default:
    return SOF_OTHER;
  case CC_X86FastCall:
    return SOF_FAST;
  case CC_X86StdCall:
    return SOF_STD;
  }
}

    void HandleTranslationUnit(ASTContext &C) override {
      {
        PrettyStackTraceString CrashInfo("Per-file LLVM IR generation");
        if (llvm::TimePassesIsEnabled)
          LLVMIRGeneration.startTimer();

        Gen->HandleTranslationUnit(C);

        if (llvm::TimePassesIsEnabled)
          LLVMIRGeneration.stopTimer();
      }

      // Silently ignore if we weren't initialized for some reason.
      if (!TheModule)
        return;

      // Make sure IR generation is happy with the module. This is released by
      // the module provider.
      llvm::Module *M = Gen->ReleaseModule();
      if (!M) {
        // The module has been released by IR gen on failures, do not double
        // free.
        TheModule.release();
        return;
      }

      assert(TheModule.get() == M &&
             "Unexpected module change during IR generation");

      // Link LinkModule into this module if present, preserving its validity.
      if (LinkModule) {
        if (Linker::LinkModules(
                M, LinkModule.get(),
                [=](const DiagnosticInfo &DI) { linkerDiagnosticHandler(DI); }))
          return;
      }

      // Install an inline asm handler so that diagnostics get printed through
      // our diagnostics hooks.
      LLVMContext &Ctx = TheModule->getContext();
      LLVMContext::InlineAsmDiagHandlerTy OldHandler =
        Ctx.getInlineAsmDiagnosticHandler();
      void *OldContext = Ctx.getInlineAsmDiagnosticContext();
      Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this);

      LLVMContext::DiagnosticHandlerTy OldDiagnosticHandler =
          Ctx.getDiagnosticHandler();
      void *OldDiagnosticContext = Ctx.getDiagnosticContext();
      Ctx.setDiagnosticHandler(DiagnosticHandler, this);

      EmbedBitcode(TheModule.get(), CodeGenOpts);
      EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
                        C.getTargetInfo().getTargetDescription(),
                        TheModule.get(), Action, AsmOutStream);

      Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext);

      Ctx.setDiagnosticHandler(OldDiagnosticHandler, OldDiagnosticContext);
    }

static bool isArc4RandomAvailable(const ASTContext &Ctx) {
  const llvm::Triple &T = Ctx.getTargetInfo().getTriple();
  return T.getVendor() == llvm::Triple::Apple ||
         T.getOS() == llvm::Triple::FreeBSD ||
         T.getOS() == llvm::Triple::NetBSD ||
         T.getOS() == llvm::Triple::OpenBSD ||
         T.getOS() == llvm::Triple::DragonFly;
}

static bool isArc4RandomAvailable(const ASTContext &Ctx) {
  const llvm::Triple &T = Ctx.getTargetInfo().getTriple();
  return T.getVendor() == llvm::Triple::Apple ||
         T.getOS() == llvm::Triple::CloudABI ||
         T.isOSFreeBSD() ||
         T.isOSNetBSD() ||
         T.isOSOpenBSD() ||
         T.isOSDragonFly();
}

// Constructor for C++ records.
ASTRecordLayout::ASTRecordLayout(const ASTContext &Ctx,
                                 CharUnits size, CharUnits alignment,
                                 CharUnits requiredAlignment,
                                 bool hasOwnVFPtr, bool hasExtendableVFPtr,
                                 CharUnits vbptroffset,
                                 CharUnits datasize,
                                 const uint64_t *fieldoffsets,
                                 unsigned fieldcount,
                                 CharUnits nonvirtualsize,
                                 CharUnits nonvirtualalignment,
                                 CharUnits SizeOfLargestEmptySubobject,
                                 const CXXRecordDecl *PrimaryBase,
                                 bool IsPrimaryBaseVirtual,
                                 const CXXRecordDecl *BaseSharingVBPtr,
                                 bool HasZeroSizedSubObject,
                                 bool LeadsWithZeroSizedBase,
                                 const BaseOffsetsMapTy& BaseOffsets,
                                 const VBaseOffsetsMapTy& VBaseOffsets)
  : Size(size), DataSize(datasize), Alignment(alignment),
    RequiredAlignment(requiredAlignment), FieldOffsets(nullptr),
    FieldCount(fieldcount), CXXInfo(new (Ctx) CXXRecordLayoutInfo)
{
  if (FieldCount > 0)  {
    FieldOffsets = new (Ctx) uint64_t[FieldCount];
    memcpy(FieldOffsets, fieldoffsets, FieldCount * sizeof(*FieldOffsets));
  }

  CXXInfo->PrimaryBase.setPointer(PrimaryBase);
  CXXInfo->PrimaryBase.setInt(IsPrimaryBaseVirtual);
  CXXInfo->NonVirtualSize = nonvirtualsize;
  CXXInfo->NonVirtualAlignment = nonvirtualalignment;
  CXXInfo->SizeOfLargestEmptySubobject = SizeOfLargestEmptySubobject;
  CXXInfo->BaseOffsets = BaseOffsets;
  CXXInfo->VBaseOffsets = VBaseOffsets;
  CXXInfo->HasOwnVFPtr = hasOwnVFPtr;
  CXXInfo->VBPtrOffset = vbptroffset;
  CXXInfo->HasExtendableVFPtr = hasExtendableVFPtr;
  CXXInfo->BaseSharingVBPtr = BaseSharingVBPtr;
  CXXInfo->HasZeroSizedSubObject = HasZeroSizedSubObject;
  CXXInfo->LeadsWithZeroSizedBase = LeadsWithZeroSizedBase;


#ifndef NDEBUG
    if (const CXXRecordDecl *PrimaryBase = getPrimaryBase()) {
      if (isPrimaryBaseVirtual()) {
        if (Ctx.getTargetInfo().getCXXABI().hasPrimaryVBases()) {
          assert(getVBaseClassOffset(PrimaryBase).isZero() &&
                 "Primary virtual base must be at offset 0!");
        }
      } else {
        assert(getBaseClassOffset(PrimaryBase).isZero() &&
               "Primary base must be at offset 0!");
      }
    }
#endif        
}

    void HandleTranslationUnit(ASTContext &C) override {
      {
        PrettyStackTraceString CrashInfo("Per-file LLVM IR generation");
        if (llvm::TimePassesIsEnabled)
          LLVMIRGeneration.startTimer();

        Gen->HandleTranslationUnit(C);

        if (llvm::TimePassesIsEnabled)
          LLVMIRGeneration.stopTimer();
      }

      // Silently ignore if we weren't initialized for some reason.
      if (!getModule())
        return;

      // Install an inline asm handler so that diagnostics get printed through
      // our diagnostics hooks.
      LLVMContext &Ctx = getModule()->getContext();
      LLVMContext::InlineAsmDiagHandlerTy OldHandler =
        Ctx.getInlineAsmDiagnosticHandler();
      void *OldContext = Ctx.getInlineAsmDiagnosticContext();
      Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this);

      LLVMContext::DiagnosticHandlerTy OldDiagnosticHandler =
          Ctx.getDiagnosticHandler();
      void *OldDiagnosticContext = Ctx.getDiagnosticContext();
      Ctx.setDiagnosticHandler(DiagnosticHandler, this);

      // Link LinkModule into this module if present, preserving its validity.
      for (auto &I : LinkModules) {
        unsigned LinkFlags = I.first;
        CurLinkModule = I.second.get();
        if (Linker::linkModules(*getModule(), std::move(I.second), LinkFlags))
          return;
      }

      EmbedBitcode(getModule(), CodeGenOpts, llvm::MemoryBufferRef());

      EmitBackendOutput(Diags, CodeGenOpts, TargetOpts, LangOpts,
                        C.getTargetInfo().getDataLayout(),
                        getModule(), Action, std::move(AsmOutStream));

      Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext);

      Ctx.setDiagnosticHandler(OldDiagnosticHandler, OldDiagnosticContext);
    }

ArgType PrintfSpecifier::getArgType(ASTContext &Ctx,
                                    bool IsObjCLiteral) const {
  const PrintfConversionSpecifier &CS = getConversionSpecifier();

  if (!CS.consumesDataArgument())
    return ArgType::Invalid();

  if (CS.getKind() == ConversionSpecifier::cArg)
    switch (LM.getKind()) {
      case LengthModifier::None:
        return Ctx.IntTy;
      case LengthModifier::AsLong:
      case LengthModifier::AsWide:
        return ArgType(ArgType::WIntTy, "wint_t");
      case LengthModifier::AsShort:
        if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
          return Ctx.IntTy;
        LLVM_FALLTHROUGH;
      default:
        return ArgType::Invalid();
    }

  if (CS.isIntArg())
    switch (LM.getKind()) {
      case LengthModifier::AsLongDouble:
        // GNU extension.
        return Ctx.LongLongTy;
      case LengthModifier::None:
        return Ctx.IntTy;
      case LengthModifier::AsInt32:
        return ArgType(Ctx.IntTy, "__int32");
      case LengthModifier::AsChar: return ArgType::AnyCharTy;
      case LengthModifier::AsShort: return Ctx.ShortTy;
      case LengthModifier::AsLong: return Ctx.LongTy;
      case LengthModifier::AsLongLong:
      case LengthModifier::AsQuad:
        return Ctx.LongLongTy;
      case LengthModifier::AsInt64:
        return ArgType(Ctx.LongLongTy, "__int64");
      case LengthModifier::AsIntMax:
        return ArgType(Ctx.getIntMaxType(), "intmax_t");
      case LengthModifier::AsSizeT:
        // FIXME: How to get the corresponding signed version of size_t?
        return ArgType();
      case LengthModifier::AsInt3264:
        return Ctx.getTargetInfo().getTriple().isArch64Bit()
                   ? ArgType(Ctx.LongLongTy, "__int64")
                   : ArgType(Ctx.IntTy, "__int32");
      case LengthModifier::AsPtrDiff:
        return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t");
      case LengthModifier::AsAllocate:
      case LengthModifier::AsMAllocate:
      case LengthModifier::AsWide:
        return ArgType::Invalid();
    }

  if (CS.isUIntArg())
    switch (LM.getKind()) {
      case LengthModifier::AsLongDouble:
        // GNU extension.
        return Ctx.UnsignedLongLongTy;
      case LengthModifier::None:
        return Ctx.UnsignedIntTy;
      case LengthModifier::AsInt32:
        return ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
      case LengthModifier::AsChar: return Ctx.UnsignedCharTy;
      case LengthModifier::AsShort: return Ctx.UnsignedShortTy;
      case LengthModifier::AsLong: return Ctx.UnsignedLongTy;
      case LengthModifier::AsLongLong:
      case LengthModifier::AsQuad:
        return Ctx.UnsignedLongLongTy;
      case LengthModifier::AsInt64:
        return ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64");
      case LengthModifier::AsIntMax:
        return ArgType(Ctx.getUIntMaxType(), "uintmax_t");
      case LengthModifier::AsSizeT:
        return ArgType(Ctx.getSizeType(), "size_t");
      case LengthModifier::AsInt3264:
        return Ctx.getTargetInfo().getTriple().isArch64Bit()
                   ? ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64")
                   : ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
      case LengthModifier::AsPtrDiff:
        // FIXME: How to get the corresponding unsigned
        // version of ptrdiff_t?
        return ArgType();
      case LengthModifier::AsAllocate:
      case LengthModifier::AsMAllocate:
      case LengthModifier::AsWide:
        return ArgType::Invalid();
    }

  if (CS.isDoubleArg()) {
    if (LM.getKind() == LengthModifier::AsLongDouble)
      return Ctx.LongDoubleTy;
    return Ctx.DoubleTy;
  }

  if (CS.getKind() == ConversionSpecifier::nArg) {
    switch (LM.getKind()) {
      case LengthModifier::None:
//.........这里部分代码省略.........

/// \brief Determine the availability of the given declaration based on
/// the target platform.
///
/// When it returns an availability result other than \c AR_Available,
/// if the \p Message parameter is non-NULL, it will be set to a
/// string describing why the entity is unavailable.
///
/// FIXME: Make these strings localizable, since they end up in
/// diagnostics.
static AvailabilityResult CheckAvailability(ASTContext &Context,
                                            const AvailabilityAttr *A,
                                            std::string *Message) {
  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
  StringRef PrettyPlatformName
    = AvailabilityAttr::getPrettyPlatformName(TargetPlatform);
  if (PrettyPlatformName.empty())
    PrettyPlatformName = TargetPlatform;

  VersionTuple TargetMinVersion = Context.getTargetInfo().getPlatformMinVersion();
  if (TargetMinVersion.empty())
    return AR_Available;

  // Match the platform name.
  if (A->getPlatform()->getName() != TargetPlatform)
    return AR_Available;
  
  std::string HintMessage;
  if (!A->getMessage().empty()) {
    HintMessage = " - ";
    HintMessage += A->getMessage();
  }
  
  // Make sure that this declaration has not been marked 'unavailable'.
  if (A->getUnavailable()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "not available on " << PrettyPlatformName 
          << HintMessage;
    }

    return AR_Unavailable;
  }

  // Make sure that this declaration has already been introduced.
  if (!A->getIntroduced().empty() && 
      TargetMinVersion < A->getIntroduced()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "introduced in " << PrettyPlatformName << ' ' 
          << A->getIntroduced() << HintMessage;
    }

    return AR_NotYetIntroduced;
  }

  // Make sure that this declaration hasn't been obsoleted.
  if (!A->getObsoleted().empty() && TargetMinVersion >= A->getObsoleted()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "obsoleted in " << PrettyPlatformName << ' ' 
          << A->getObsoleted() << HintMessage;
    }
    
    return AR_Unavailable;
  }

  // Make sure that this declaration hasn't been deprecated.
  if (!A->getDeprecated().empty() && TargetMinVersion >= A->getDeprecated()) {
    if (Message) {
      Message->clear();
      llvm::raw_string_ostream Out(*Message);
      Out << "first deprecated in " << PrettyPlatformName << ' '
          << A->getDeprecated() << HintMessage;
    }
    
    return AR_Deprecated;
  }

  return AR_Available;
}

bool ScanfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
                             ASTContext &Ctx) {
  if (!QT->isPointerType())
    return false;

  // %n is different from other conversion specifiers; don't try to fix it.
  if (CS.getKind() == ConversionSpecifier::nArg)
    return false;

  QualType PT = QT->getPointeeType();

  // If it's an enum, get its underlying type.
  if (const EnumType *ETy = QT->getAs<EnumType>())
    QT = ETy->getDecl()->getIntegerType();
  
  const BuiltinType *BT = PT->getAs<BuiltinType>();
  if (!BT)
    return false;

  // Pointer to a character.
  if (PT->isAnyCharacterType()) {
    CS.setKind(ConversionSpecifier::sArg);
    if (PT->isWideCharType())
      LM.setKind(LengthModifier::AsWideChar);
    else
      LM.setKind(LengthModifier::None);
    return true;
  }

  // Figure out the length modifier.
  switch (BT->getKind()) {
    // no modifier
    case BuiltinType::UInt:
    case BuiltinType::Int:
    case BuiltinType::Float:
      LM.setKind(LengthModifier::None);
      break;

    // hh
    case BuiltinType::Char_U:
    case BuiltinType::UChar:
    case BuiltinType::Char_S:
    case BuiltinType::SChar:
      LM.setKind(LengthModifier::AsChar);
      break;

    // h
    case BuiltinType::Short:
    case BuiltinType::UShort:
      LM.setKind(LengthModifier::AsShort);
      break;

    // l
    case BuiltinType::Long:
    case BuiltinType::ULong:
    case BuiltinType::Double:
      LM.setKind(LengthModifier::AsLong);
      break;

    // ll
    case BuiltinType::LongLong:
    case BuiltinType::ULongLong:
      LM.setKind(LengthModifier::AsLongLong);
      break;

    // L
    case BuiltinType::LongDouble:
      LM.setKind(LengthModifier::AsLongDouble);
      break;

    // Don't know.
    default:
      return false;
  }

  // Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
  if (isa<TypedefType>(PT) && (LangOpt.F90 || LangOpt.F90))
    namedTypeToLengthModifier(PT, LM);

  // If fixing the length modifier was enough, we are done.
  if (hasValidLengthModifier(Ctx.getTargetInfo())) {
    const analyze_scanf::ArgType &AT = getArgType(Ctx);
    if (AT.isValid() && AT.matchesType(Ctx, QT))
      return true;
  }

  // Figure out the conversion specifier.
  if (PT->isRealFloatingType())
    CS.setKind(ConversionSpecifier::fArg);
  else if (PT->isSignedIntegerType())
    CS.setKind(ConversionSpecifier::dArg);
  else if (PT->isUnsignedIntegerType())
    CS.setKind(ConversionSpecifier::uArg);
  else
    llvm_unreachable("Unexpected type");

  return true;
}

 Implementation(ASTContext &Ctx)
   : MC(Ctx.createMangleContext()),
     DL(Ctx.getTargetInfo().getDataLayoutString()) {}

//.........这里部分代码省略.........
#define SIGNED_TYPE(Id, SingletonId)
#define UNSIGNED_TYPE(Id, SingletonId)
#define FLOATING_TYPE(Id, SingletonId)
#define BUILTIN_TYPE(Id, SingletonId) \
  case BuiltinType::Id:
#include "clang/AST/BuiltinTypes.def"
    // Misc other stuff which doesn't make sense here.
    return false;

  case BuiltinType::UInt:
  case BuiltinType::Int:
  case BuiltinType::Float:
  case BuiltinType::Double:
    LM.setKind(LengthModifier::None);
    break;

  case BuiltinType::Char_U:
  case BuiltinType::UChar:
  case BuiltinType::Char_S:
  case BuiltinType::SChar:
    LM.setKind(LengthModifier::AsChar);
    break;

  case BuiltinType::Short:
  case BuiltinType::UShort:
    LM.setKind(LengthModifier::AsShort);
    break;

  case BuiltinType::Long:
  case BuiltinType::ULong:
    LM.setKind(LengthModifier::AsLong);
    break;

  case BuiltinType::LongLong:
  case BuiltinType::ULongLong:
    LM.setKind(LengthModifier::AsLongLong);
    break;

  case BuiltinType::LongDouble:
    LM.setKind(LengthModifier::AsLongDouble);
    break;
  }

  // Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
  if (isa<TypedefType>(QT) && (LangOpt.C99 || LangOpt.CPlusPlus11))
    namedTypeToLengthModifier(QT, LM);

  // If fixing the length modifier was enough, we might be done.
  if (hasValidLengthModifier(Ctx.getTargetInfo())) {
    // If we're going to offer a fix anyway, make sure the sign matches.
    switch (CS.getKind()) {
    case ConversionSpecifier::uArg:
    case ConversionSpecifier::UArg:
      if (QT->isSignedIntegerType())
        CS.setKind(clang::analyze_format_string::ConversionSpecifier::dArg);
      break;
    case ConversionSpecifier::dArg:
    case ConversionSpecifier::DArg:
    case ConversionSpecifier::iArg:
      if (QT->isUnsignedIntegerType() && !HasPlusPrefix)
        CS.setKind(clang::analyze_format_string::ConversionSpecifier::uArg);
      break;
    default:
      // Other specifiers do not have signed/unsigned variants.
      break;
    }

    const analyze_printf::ArgType &ATR = getArgType(Ctx, IsObjCLiteral);
    if (ATR.isValid() && ATR.matchesType(Ctx, QT))
      return true;
  }

  // Set conversion specifier and disable any flags which do not apply to it.
  // Let typedefs to char fall through to int, as %c is silly for uint8_t.
  if (!isa<TypedefType>(QT) && QT->isCharType()) {
    CS.setKind(ConversionSpecifier::cArg);
    LM.setKind(LengthModifier::None);
    Precision.setHowSpecified(OptionalAmount::NotSpecified);
    HasAlternativeForm = 0;
    HasLeadingZeroes = 0;
    HasPlusPrefix = 0;
  }
  // Test for Floating type first as LongDouble can pass isUnsignedIntegerType
  else if (QT->isRealFloatingType()) {
    CS.setKind(ConversionSpecifier::fArg);
  }
  else if (QT->isSignedIntegerType()) {
    CS.setKind(ConversionSpecifier::dArg);
    HasAlternativeForm = 0;
  }
  else if (QT->isUnsignedIntegerType()) {
    CS.setKind(ConversionSpecifier::uArg);
    HasAlternativeForm = 0;
    HasPlusPrefix = 0;
  } else {
    llvm_unreachable("Unexpected type");
  }

  return true;
}