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+class Type<bit abstract = 0> {
+ bit Abstract = abstract;
+}
+
+class DerivedType<Type base, bit abstract = 0> : Type<abstract> {
+ Type Base = base;
+}
+
+/// A type node that is only used to represent dependent types in C++. For
+/// example, DependentTemplateSpecializationType is used to represent types
+/// where the base template-id is dependent (such as `T::foo<U>`). Code
+/// that only works with non-dependent types can ignore these type nodes.
+class AlwaysDependent {}
+
+/// A type node that is never used to represent a canonical type, which is to
+/// say that it always represents some sort of type "sugar" which can
+/// (supposedly) be erased without affecting the formal behavior of the
+/// language. For example, in standard C/C++, typedefs do not introduce new
+/// types and do not affect the semantics of the program. Code that only
+/// works with canonical types can ignore these type nodes.
+///
+/// Note that this simple story about non-canonical types is not the whole
+/// truth. Languages and extensions often have formation rules which differ
+/// based on how a type is spelled and which therefore are not consistent
+/// with immediately stipping away type sugar. More critically, attributes on
+/// typedefs can have semantic impacts in ways that are only reflected in our
+/// AST by preserving the typedef sugar; for example, we do not otherwise
+/// represent the alignment attribute on typedefs, and so it is necessary to
+/// preserve typedef structure into most parts of IR generation.
+class NeverCanonical {}
+
+/// A type node that only represents a canonical type in some dependent cases.
+/// For example, `std::vector<int>` (a TemplateSpecializationType) is
+/// considered to be a non-canonical representation for the RecordType
+/// referencing the concrete ClassTemplateSpecializationDecl; but
+/// `std::vector<T>` cannot be resolved to a concrete specialization
+/// and so remains canonical. Code which only works with non-dependent
+/// canonical types can ignore these nodes.
+class NeverCanonicalUnlessDependent {}
+
+/// A type node which never has component type structure. Some code may be
+/// able to operate on leaf types faster than they can on non-leaf types.
+///
+/// For example, the function type `void (int)` is not a leaf type because it
+/// is structurally composed of component types (`void` and `int`).
+///
+/// A struct type is a leaf type because its field types are not part of its
+/// type-expression.
+///
+/// Nodes like `TypedefType` which are syntactically leaves but can desugar
+/// to types that may not be leaves should not declare this.
+class LeafType {}
+
+def BuiltinType : Type, LeafType;
+def ComplexType : Type;
+def PointerType : Type;
+def BlockPointerType : Type;
+def ReferenceType : Type<1>;
+def LValueReferenceType : DerivedType<ReferenceType>;
+def RValueReferenceType : DerivedType<ReferenceType>;
+def MemberPointerType : Type;
+def ArrayType : Type<1>;
+def ConstantArrayType : DerivedType<ArrayType>;
+def IncompleteArrayType : DerivedType<ArrayType>;
+def VariableArrayType : DerivedType<ArrayType>;
+def DependentSizedArrayType : DerivedType<ArrayType>, AlwaysDependent;
+def DependentSizedExtVectorType : Type, AlwaysDependent;
+def DependentAddressSpaceType : Type, AlwaysDependent;
+def VectorType : Type;
+def DependentVectorType : Type, AlwaysDependent;
+def ExtVectorType : DerivedType<VectorType>;
+def FunctionType : Type<1>;
+def FunctionProtoType : DerivedType<FunctionType>;
+def FunctionNoProtoType : DerivedType<FunctionType>;
+def UnresolvedUsingType : Type, AlwaysDependent;
+def ParenType : Type, NeverCanonical;
+def TypedefType : Type, NeverCanonical;
+def MacroQualifiedType : Type, NeverCanonical;
+def AdjustedType : Type, NeverCanonical;
+def DecayedType : DerivedType<AdjustedType>, NeverCanonical;
+def TypeOfExprType : Type, NeverCanonicalUnlessDependent;
+def TypeOfType : Type, NeverCanonicalUnlessDependent;
+def DecltypeType : Type, NeverCanonicalUnlessDependent;
+def UnaryTransformType : Type, NeverCanonicalUnlessDependent;
+def TagType : Type<1>;
+def RecordType : DerivedType<TagType>, LeafType;
+def EnumType : DerivedType<TagType>, LeafType;
+def ElaboratedType : Type, NeverCanonical;
+def AttributedType : Type, NeverCanonical;
+def TemplateTypeParmType : Type, AlwaysDependent, LeafType;
+def SubstTemplateTypeParmType : Type, NeverCanonical;
+def SubstTemplateTypeParmPackType : Type, AlwaysDependent;
+def TemplateSpecializationType : Type, NeverCanonicalUnlessDependent;
+def DeducedType : Type<1>;
+def AutoType : DerivedType<DeducedType>;
+def DeducedTemplateSpecializationType : DerivedType<DeducedType>;
+def InjectedClassNameType : Type, AlwaysDependent, LeafType;
+def DependentNameType : Type, AlwaysDependent;
+def DependentTemplateSpecializationType : Type, AlwaysDependent;
+def PackExpansionType : Type, NeverCanonicalUnlessDependent;
+def ObjCTypeParamType : Type, NeverCanonical;
+def ObjCObjectType : Type;
+def ObjCInterfaceType : DerivedType<ObjCObjectType>, LeafType;
+def ObjCObjectPointerType : Type;
+def PipeType : Type;
+def AtomicType : Type;