//===-- Types.h - API Notes Data Types --------------------------*- 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

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_APINOTES_TYPES_H

#define LLVM_CLANG_APINOTES_TYPES_H

#include "clang/Basic/Specifiers.h"

#include "llvm/ADT/Optional.h"

#include "llvm/ADT/StringRef.h"

#include <climits>

#include <vector>

namespace clang {

namespace api_notes {

enum class RetainCountConventionKind {

  None,

  CFReturnsRetained,

  CFReturnsNotRetained,

  NSReturnsRetained,

  NSReturnsNotRetained,

};

/// The payload for an enum_extensibility attribute. This is a tri-state rather

/// than just a boolean because the presence of the attribute indicates

/// auditing.

enum class EnumExtensibilityKind {

  None,

  Open,

  Closed,

};

/// The kind of a swift_wrapper/swift_newtype.

enum class SwiftNewTypeKind {

  None,

  Struct,

  Enum,

};

/// Describes API notes data for any entity.

///

/// This is used as the base of all API notes.

class CommonEntityInfo {

public:

  /// Message to use when this entity is unavailable.

  std::string UnavailableMsg;

  /// Whether this entity is marked unavailable.

  unsigned Unavailable : 1;

  /// Whether this entity is marked unavailable in Swift.

  unsigned UnavailableInSwift : 1;

private:

  /// Whether SwiftPrivate was specified.

  unsigned SwiftPrivateSpecified : 1;

  /// Whether this entity is considered "private" to a Swift overlay.

  unsigned SwiftPrivate : 1;

public:

  /// Swift name of this entity.

  std::string SwiftName;

  CommonEntityInfo()

      : Unavailable(0), UnavailableInSwift(0), SwiftPrivateSpecified(0),

        SwiftPrivate(0) {}

  llvm::Optional<bool> isSwiftPrivate() const {

    return SwiftPrivateSpecified ? llvm::Optional<bool>(SwiftPrivate)

                                 : llvm::None;

  }

  void setSwiftPrivate(llvm::Optional<bool> Private) {

    SwiftPrivateSpecified = Private.hasValue();

    SwiftPrivate = Private.hasValue() ? *Private : 0;

  }

  friend bool operator==(const CommonEntityInfo &, const CommonEntityInfo &);

  CommonEntityInfo &operator|=(const CommonEntityInfo &RHS) {

    // Merge unavailability.

    if (RHS.Unavailable) {

      Unavailable = true;

      if (UnavailableMsg.empty())

        UnavailableMsg = RHS.UnavailableMsg;

    }

    if (RHS.UnavailableInSwift) {

      UnavailableInSwift = true;

      if (UnavailableMsg.empty())

        UnavailableMsg = RHS.UnavailableMsg;

    }

    if (!SwiftPrivateSpecified)

      setSwiftPrivate(RHS.isSwiftPrivate());

    if (SwiftName.empty())

      SwiftName = RHS.SwiftName;

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const CommonEntityInfo &LHS,

                       const CommonEntityInfo &RHS) {

  return LHS.UnavailableMsg == RHS.UnavailableMsg &&

         LHS.Unavailable == RHS.Unavailable &&

         LHS.UnavailableInSwift == RHS.UnavailableInSwift &&

         LHS.SwiftPrivateSpecified == RHS.SwiftPrivateSpecified &&

         LHS.SwiftPrivate == RHS.SwiftPrivate && LHS.SwiftName == RHS.SwiftName;

}

inline bool operator!=(const CommonEntityInfo &LHS,

                       const CommonEntityInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes for types.

class CommonTypeInfo : public CommonEntityInfo {

  /// The Swift type to which a given type is bridged.

  ///

  /// Reflects the swift_bridge attribute.

  llvm::Optional<std::string> SwiftBridge;

  /// The NS error domain for this type.

  llvm::Optional<std::string> NSErrorDomain;

public:

  CommonTypeInfo() : CommonEntityInfo() {}

  const llvm::Optional<std::string> &getSwiftBridge() const {

    return SwiftBridge;

  }

  void setSwiftBridge(const llvm::Optional<std::string> &SwiftType) {

    SwiftBridge = SwiftType;

  }

  void setSwiftBridge(const llvm::Optional<llvm::StringRef> &SwiftType) {

    SwiftBridge = SwiftType

                      ? llvm::Optional<std::string>(std::string(*SwiftType))

                      : llvm::None;

  }

  const llvm::Optional<std::string> &getNSErrorDomain() const {

    return NSErrorDomain;

  }

  void setNSErrorDomain(const llvm::Optional<std::string> &Domain) {

    NSErrorDomain = Domain;

  }

  void setNSErrorDomain(const llvm::Optional<llvm::StringRef> &Domain) {

    NSErrorDomain =

        Domain ? llvm::Optional<std::string>(std::string(*Domain)) : llvm::None;

  }

  friend bool operator==(const CommonTypeInfo &, const CommonTypeInfo &);

  CommonTypeInfo &operator|=(const CommonTypeInfo &RHS) {

    // Merge inherited info.

    static_cast<CommonEntityInfo &>(*this) |= RHS;

    if (!SwiftBridge)

      setSwiftBridge(RHS.getSwiftBridge());

    if (!NSErrorDomain)

      setNSErrorDomain(RHS.getNSErrorDomain());

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const CommonTypeInfo &LHS, const CommonTypeInfo &RHS) {

  return static_cast<const CommonEntityInfo &>(LHS) == RHS &&

         LHS.SwiftBridge == RHS.SwiftBridge &&

         LHS.NSErrorDomain == RHS.NSErrorDomain;

}

inline bool operator!=(const CommonTypeInfo &LHS, const CommonTypeInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes data for an Objective-C class or protocol.

class ObjCContextInfo : public CommonTypeInfo {

  /// Whether this class has a default nullability.

  unsigned HasDefaultNullability : 1;

  /// The default nullability.

  unsigned DefaultNullability : 2;

  /// Whether this class has designated initializers recorded.

  unsigned HasDesignatedInits : 1;

  unsigned SwiftImportAsNonGenericSpecified : 1;

  unsigned SwiftImportAsNonGeneric : 1;

  unsigned SwiftObjCMembersSpecified : 1;

  unsigned SwiftObjCMembers : 1;

public:

  ObjCContextInfo()

      : CommonTypeInfo(), HasDefaultNullability(0), DefaultNullability(0),

        HasDesignatedInits(0), SwiftImportAsNonGenericSpecified(false),

        SwiftImportAsNonGeneric(false), SwiftObjCMembersSpecified(false),

        SwiftObjCMembers(false) {}

  /// Determine the default nullability for properties and methods of this

  /// class.

  ///

  /// eturns the default nullability, if implied, or None if there is no

  llvm::Optional<NullabilityKind> getDefaultNullability() const {

    return HasDefaultNullability

               ? llvm::Optional<NullabilityKind>(

                     static_cast<NullabilityKind>(DefaultNullability))

               : llvm::None;

  }

  /// Set the default nullability for properties and methods of this class.

  void setDefaultNullability(NullabilityKind Kind) {

    HasDefaultNullability = true;

    DefaultNullability = static_cast<unsigned>(Kind);

  }

  bool hasDesignatedInits() const { return HasDesignatedInits; }

  void setHasDesignatedInits(bool Value) { HasDesignatedInits = Value; }

  llvm::Optional<bool> getSwiftImportAsNonGeneric() const {

    return SwiftImportAsNonGenericSpecified

               ? llvm::Optional<bool>(SwiftImportAsNonGeneric)

               : llvm::None;

  }

  void setSwiftImportAsNonGeneric(llvm::Optional<bool> Value) {

    SwiftImportAsNonGenericSpecified = Value.hasValue();

    SwiftImportAsNonGeneric = Value.hasValue() ? *Value : false;

  }

  llvm::Optional<bool> getSwiftObjCMembers() const {

    return SwiftObjCMembersSpecified ? llvm::Optional<bool>(SwiftObjCMembers)

                                     : llvm::None;

  }

  void setSwiftObjCMembers(llvm::Optional<bool> Value) {

    SwiftObjCMembersSpecified = Value.hasValue();

    SwiftObjCMembers = Value.hasValue() ? *Value : false;

  }

  /// Strip off any information within the class information structure that is

  /// module-local, such as 'audited' flags.

  void stripModuleLocalInfo() {

    HasDefaultNullability = false;

    DefaultNullability = 0;

  }

  friend bool operator==(const ObjCContextInfo &, const ObjCContextInfo &);

  ObjCContextInfo &operator|=(const ObjCContextInfo &RHS) {

    // Merge inherited info.

    static_cast<CommonTypeInfo &>(*this) |= RHS;

    // Merge nullability.

    if (!getDefaultNullability())

      if (auto Nullability = RHS.getDefaultNullability())

        setDefaultNullability(*Nullability);

    if (!SwiftImportAsNonGenericSpecified)

      setSwiftImportAsNonGeneric(RHS.getSwiftImportAsNonGeneric());

    if (!SwiftObjCMembersSpecified)

      setSwiftObjCMembers(RHS.getSwiftObjCMembers());

    HasDesignatedInits |= RHS.HasDesignatedInits;

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS);

};

inline bool operator==(const ObjCContextInfo &LHS, const ObjCContextInfo &RHS) {

  return static_cast<const CommonTypeInfo &>(LHS) == RHS &&

         LHS.getDefaultNullability() == RHS.getDefaultNullability() &&

         LHS.HasDesignatedInits == RHS.HasDesignatedInits &&

         LHS.getSwiftImportAsNonGeneric() == RHS.getSwiftImportAsNonGeneric() &&

         LHS.getSwiftObjCMembers() == RHS.getSwiftObjCMembers();

}

inline bool operator!=(const ObjCContextInfo &LHS, const ObjCContextInfo &RHS) {

  return !(LHS == RHS);

}

/// API notes for a variable/property.

class VariableInfo : public CommonEntityInfo {

  /// Whether this property has been audited for nullability.

  unsigned NullabilityAudited : 1;

  /// The kind of nullability for this property. Only valid if the nullability

  /// has been audited.

  unsigned Nullable : 2;

  /// The C type of the variable, as a string.

  std::string Type;

public:

  VariableInfo() : CommonEntityInfo(), NullabilityAudited(false), Nullable(0) {}

  llvm::Optional<NullabilityKind> getNullability() const {

    return NullabilityAudited ? llvm::Optional<NullabilityKind>(

                                    static_cast<NullabilityKind>(Nullable))

                              : llvm::None;

  }

  void setNullabilityAudited(NullabilityKind kind) {

    NullabilityAudited = true;

    Nullable = static_cast<unsigned>(kind);

  }

  const std::string &getType() const { return Type; }

  void setType(const std::string &type) { Type = type; }

  friend bool operator==(const VariableInfo &, const VariableInfo &);

  VariableInfo &operator|=(const VariableInfo &RHS) {

    static_cast<CommonEntityInfo &>(*this) |= RHS;

    if (!NullabilityAudited && RHS.NullabilityAudited)

      setNullabilityAudited(*RHS.getNullability());

    if (Type.empty())

      Type = RHS.Type;

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const VariableInfo &LHS, const VariableInfo &RHS) {

  return static_cast<const CommonEntityInfo &>(LHS) == RHS &&

         LHS.NullabilityAudited == RHS.NullabilityAudited &&

         LHS.Nullable == RHS.Nullable && LHS.Type == RHS.Type;

}

inline bool operator!=(const VariableInfo &LHS, const VariableInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes data for an Objective-C property.

class ObjCPropertyInfo : public VariableInfo {

  unsigned SwiftImportAsAccessorsSpecified : 1;

  unsigned SwiftImportAsAccessors : 1;

public:

  ObjCPropertyInfo()

      : VariableInfo(), SwiftImportAsAccessorsSpecified(false),

        SwiftImportAsAccessors(false) {}

  llvm::Optional<bool> getSwiftImportAsAccessors() const {

    return SwiftImportAsAccessorsSpecified

               ? llvm::Optional<bool>(SwiftImportAsAccessors)

               : llvm::None;

  }

  void setSwiftImportAsAccessors(llvm::Optional<bool> Value) {

    SwiftImportAsAccessorsSpecified = Value.hasValue();

    SwiftImportAsAccessors = Value.hasValue() ? *Value : false;

  }

  friend bool operator==(const ObjCPropertyInfo &, const ObjCPropertyInfo &);

  /// Merge class-wide information into the given property.

  ObjCPropertyInfo &operator|=(const ObjCContextInfo &RHS) {

    static_cast<CommonEntityInfo &>(*this) |= RHS;

    // Merge nullability.

    if (!getNullability())

      if (auto Nullable = RHS.getDefaultNullability())

        setNullabilityAudited(*Nullable);

    return *this;

  }

  ObjCPropertyInfo &operator|=(const ObjCPropertyInfo &RHS) {

    static_cast<VariableInfo &>(*this) |= RHS;

    if (!SwiftImportAsAccessorsSpecified)

      setSwiftImportAsAccessors(RHS.getSwiftImportAsAccessors());

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const ObjCPropertyInfo &LHS,

                       const ObjCPropertyInfo &RHS) {

  return static_cast<const VariableInfo &>(LHS) == RHS &&

         LHS.getSwiftImportAsAccessors() == RHS.getSwiftImportAsAccessors();

}

inline bool operator!=(const ObjCPropertyInfo &LHS,

                       const ObjCPropertyInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes a function or method parameter.

class ParamInfo : public VariableInfo {

  /// Whether noescape was specified.

  unsigned NoEscapeSpecified : 1;

  /// Whether the this parameter has the 'noescape' attribute.

  unsigned NoEscape : 1;

  /// A biased RetainCountConventionKind, where 0 means "unspecified".

  ///

  /// Only relevant for out-parameters.

  unsigned RawRetainCountConvention : 3;

public:

  ParamInfo()

      : VariableInfo(), NoEscapeSpecified(false), NoEscape(false),

        RawRetainCountConvention() {}

  llvm::Optional<bool> isNoEscape() const {

    if (!NoEscapeSpecified)

      return llvm::None;

    return NoEscape;

  }

  void setNoEscape(llvm::Optional<bool> Value) {

    NoEscapeSpecified = Value.hasValue();

    NoEscape = Value.hasValue() ? *Value : false;

  }

  llvm::Optional<RetainCountConventionKind> getRetainCountConvention() const {

    if (!RawRetainCountConvention)

      return llvm::None;

    return static_cast<RetainCountConventionKind>(RawRetainCountConvention - 1);

  }

  void

  setRetainCountConvention(llvm::Optional<RetainCountConventionKind> Value) {

    RawRetainCountConvention =

        Value.hasValue() ? static_cast<unsigned>(Value.getValue()) + 1 : 0;

    assert(getRetainCountConvention() == Value && "bitfield too small");

  }

  ParamInfo &operator|=(const ParamInfo &RHS) {

    static_cast<VariableInfo &>(*this) |= RHS;

    if (!NoEscapeSpecified && RHS.NoEscapeSpecified) {

      NoEscapeSpecified = true;

      NoEscape = RHS.NoEscape;

    }

    if (!RawRetainCountConvention)

      RawRetainCountConvention = RHS.RawRetainCountConvention;

    return *this;

  }

  friend bool operator==(const ParamInfo &, const ParamInfo &);

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const ParamInfo &LHS, const ParamInfo &RHS) {

  return static_cast<const VariableInfo &>(LHS) == RHS &&

         LHS.NoEscapeSpecified == RHS.NoEscapeSpecified &&

         LHS.NoEscape == RHS.NoEscape &&

         LHS.RawRetainCountConvention == RHS.RawRetainCountConvention;

}

inline bool operator!=(const ParamInfo &LHS, const ParamInfo &RHS) {

  return !(LHS == RHS);

}

/// API notes for a function or method.

class FunctionInfo : public CommonEntityInfo {

private:

  static constexpr const unsigned NullabilityKindMask = 0x3;

  static constexpr const unsigned NullabilityKindSize = 2;

  static constexpr const unsigned ReturnInfoIndex = 0;

public:

  // If yes, we consider all types to be non-nullable unless otherwise noted.

  // If this flag is not set, the pointer types are considered to have

  // unknown nullability.

  /// Whether the signature has been audited with respect to nullability.

  unsigned NullabilityAudited : 1;

  /// Number of types whose nullability is encoded with the NullabilityPayload.

  unsigned NumAdjustedNullable : 8;

  /// A biased RetainCountConventionKind, where 0 means "unspecified".

  unsigned RawRetainCountConvention : 3;

  // NullabilityKindSize bits are used to encode the nullability. The info

  // about the return type is stored at position 0, followed by the nullability

  // of the parameters.

  /// Stores the nullability of the return type and the parameters.

  uint64_t NullabilityPayload = 0;

  /// The result type of this function, as a C type.

  std::string ResultType;

  /// The function parameters.

  std::vector<ParamInfo> Params;

  FunctionInfo()

      : CommonEntityInfo(), NullabilityAudited(false), NumAdjustedNullable(0),

        RawRetainCountConvention() {}

  static unsigned getMaxNullabilityIndex() {

    return ((sizeof(NullabilityPayload) * CHAR_BIT) / NullabilityKindSize);

  }

  void addTypeInfo(unsigned index, NullabilityKind kind) {

    assert(index <= getMaxNullabilityIndex());

    assert(static_cast<unsigned>(kind) < NullabilityKindMask);

    NullabilityAudited = true;

    if (NumAdjustedNullable < index + 1)

      NumAdjustedNullable = index + 1;

    // Mask the bits.

    NullabilityPayload &=

        ~(NullabilityKindMask << (index * NullabilityKindSize));

    // Set the value.

    unsigned kindValue = (static_cast<unsigned>(kind))

                         << (index * NullabilityKindSize);

    NullabilityPayload |= kindValue;

  }

  /// Adds the return type info.

  void addReturnTypeInfo(NullabilityKind kind) {

    addTypeInfo(ReturnInfoIndex, kind);

  }

  /// Adds the parameter type info.

  void addParamTypeInfo(unsigned index, NullabilityKind kind) {

    addTypeInfo(index + 1, kind);

  }

  NullabilityKind getParamTypeInfo(unsigned index) const {

    return getTypeInfo(index + 1);

  }

  NullabilityKind getReturnTypeInfo() const { return getTypeInfo(0); }

  llvm::Optional<RetainCountConventionKind> getRetainCountConvention() const {

    if (!RawRetainCountConvention)

      return llvm::None;

    return static_cast<RetainCountConventionKind>(RawRetainCountConvention - 1);

  }

  void

  setRetainCountConvention(llvm::Optional<RetainCountConventionKind> Value) {

    RawRetainCountConvention =

        Value.hasValue() ? static_cast<unsigned>(Value.getValue()) + 1 : 0;

    assert(getRetainCountConvention() == Value && "bitfield too small");

  }

  friend bool operator==(const FunctionInfo &, const FunctionInfo &);

private:

  NullabilityKind getTypeInfo(unsigned index) const {

    assert(NullabilityAudited &&

           "Checking the type adjustment on non-audited method.");

    // If we don't have info about this parameter, return the default.

    if (index > NumAdjustedNullable)

      return NullabilityKind::NonNull;

    auto nullability = NullabilityPayload >> (index * NullabilityKindSize);

    return static_cast<NullabilityKind>(nullability & NullabilityKindMask);

  }

public:

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const FunctionInfo &LHS, const FunctionInfo &RHS) {

  return static_cast<const CommonEntityInfo &>(LHS) == RHS &&

         LHS.NullabilityAudited == RHS.NullabilityAudited &&

         LHS.NumAdjustedNullable == RHS.NumAdjustedNullable &&

         LHS.NullabilityPayload == RHS.NullabilityPayload &&

         LHS.ResultType == RHS.ResultType && LHS.Params == RHS.Params &&

         LHS.RawRetainCountConvention == RHS.RawRetainCountConvention;

}

inline bool operator!=(const FunctionInfo &LHS, const FunctionInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes data for an Objective-C method.

class ObjCMethodInfo : public FunctionInfo {

public:

  /// Whether this is a designated initializer of its class.

  unsigned DesignatedInit : 1;

  /// Whether this is a required initializer.

  unsigned RequiredInit : 1;

  ObjCMethodInfo()

      : FunctionInfo(), DesignatedInit(false), RequiredInit(false) {}

  friend bool operator==(const ObjCMethodInfo &, const ObjCMethodInfo &);

  ObjCMethodInfo &operator|=(const ObjCContextInfo &RHS) {

    // Merge Nullability.

    if (!NullabilityAudited) {

      if (auto Nullable = RHS.getDefaultNullability()) {

        NullabilityAudited = true;

        addTypeInfo(0, *Nullable);

      }

    }

    return *this;

  }

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS);

};

inline bool operator==(const ObjCMethodInfo &LHS, const ObjCMethodInfo &RHS) {

  return static_cast<const FunctionInfo &>(LHS) == RHS &&

         LHS.DesignatedInit == RHS.DesignatedInit &&

         LHS.RequiredInit == RHS.RequiredInit;

}

inline bool operator!=(const ObjCMethodInfo &LHS, const ObjCMethodInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes data for a global variable.

class GlobalVariableInfo : public VariableInfo {

public:

  GlobalVariableInfo() : VariableInfo() {}

};

/// Describes API notes data for a global function.

class GlobalFunctionInfo : public FunctionInfo {

public:

  GlobalFunctionInfo() : FunctionInfo() {}

};

/// Describes API notes data for an enumerator.

class EnumConstantInfo : public CommonEntityInfo {

public:

  EnumConstantInfo() : CommonEntityInfo() {}

};

/// Describes API notes data for a tag.

class TagInfo : public CommonTypeInfo {

  unsigned HasFlagEnum : 1;

  unsigned IsFlagEnum : 1;

public:

  llvm::Optional<EnumExtensibilityKind> EnumExtensibility;

  TagInfo() : CommonTypeInfo(), HasFlagEnum(0), IsFlagEnum(0) {}

  llvm::Optional<bool> isFlagEnum() const {

    if (HasFlagEnum)

      return IsFlagEnum;

    return llvm::None;

  }

  void setFlagEnum(llvm::Optional<bool> Value) {

    HasFlagEnum = Value.hasValue();

    IsFlagEnum = Value.hasValue() ? *Value : false;

  }

  TagInfo &operator|=(const TagInfo &RHS) {

    static_cast<CommonTypeInfo &>(*this) |= RHS;

    if (!HasFlagEnum && HasFlagEnum)

      setFlagEnum(RHS.isFlagEnum());

    if (!EnumExtensibility.hasValue())

      EnumExtensibility = RHS.EnumExtensibility;

    return *this;

  }

  friend bool operator==(const TagInfo &, const TagInfo &);

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS);

};

inline bool operator==(const TagInfo &LHS, const TagInfo &RHS) {

  return static_cast<const CommonTypeInfo &>(LHS) == RHS &&

         LHS.isFlagEnum() == RHS.isFlagEnum() &&

         LHS.EnumExtensibility == RHS.EnumExtensibility;

}

inline bool operator!=(const TagInfo &LHS, const TagInfo &RHS) {

  return !(LHS == RHS);

}

/// Describes API notes data for a typedef.

class TypedefInfo : public CommonTypeInfo {

public:

  llvm::Optional<SwiftNewTypeKind> SwiftWrapper;

  TypedefInfo() : CommonTypeInfo() {}

  TypedefInfo &operator|=(const TypedefInfo &RHS) {

    static_cast<CommonTypeInfo &>(*this) |= RHS;

    if (!SwiftWrapper.hasValue())

      SwiftWrapper = RHS.SwiftWrapper;

    return *this;

  }

  friend bool operator==(const TypedefInfo &, const TypedefInfo &);

  LLVM_DUMP_METHOD void dump(llvm::raw_ostream &OS) const;

};

inline bool operator==(const TypedefInfo &LHS, const TypedefInfo &RHS) {

  return static_cast<const CommonTypeInfo &>(LHS) == RHS &&

         LHS.SwiftWrapper == RHS.SwiftWrapper;

}

inline bool operator!=(const TypedefInfo &LHS, const TypedefInfo &RHS) {

  return !(LHS == RHS);

}

} // namespace api_notes

} // namespace clang

#endif