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      1 //===-- CanonicalType.h - C Language Family Type Representation -*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 //  This file defines the CanQual class template, which provides access to
     11 //  canonical types.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_CLANG_AST_CANONICALTYPE_H
     16 #define LLVM_CLANG_AST_CANONICALTYPE_H
     17 
     18 #include "clang/AST/Type.h"
     19 #include "llvm/ADT/iterator.h"
     20 #include "llvm/Support/Casting.h"
     21 
     22 namespace clang {
     23 
     24 template<typename T> class CanProxy;
     25 template<typename T> struct CanProxyAdaptor;
     26 
     27 //----------------------------------------------------------------------------//
     28 // Canonical, qualified type template
     29 //----------------------------------------------------------------------------//
     30 
     31 /// \brief Represents a canonical, potentially-qualified type.
     32 ///
     33 /// The CanQual template is a lightweight smart pointer that provides access
     34 /// to the canonical representation of a type, where all typedefs and other
     35 /// syntactic sugar has been eliminated. A CanQualType may also have various
     36 /// qualifiers (const, volatile, restrict) attached to it.
     37 ///
     38 /// The template type parameter @p T is one of the Type classes (PointerType,
     39 /// BuiltinType, etc.). The type stored within @c CanQual<T> will be of that
     40 /// type (or some subclass of that type). The typedef @c CanQualType is just
     41 /// a shorthand for @c CanQual<Type>.
     42 ///
     43 /// An instance of @c CanQual<T> can be implicitly converted to a
     44 /// @c CanQual<U> when T is derived from U, which essentially provides an
     45 /// implicit upcast. For example, @c CanQual<LValueReferenceType> can be
     46 /// converted to @c CanQual<ReferenceType>. Note that any @c CanQual type can
     47 /// be implicitly converted to a QualType, but the reverse operation requires
     48 /// a call to ASTContext::getCanonicalType().
     49 ///
     50 ///
     51 template<typename T = Type>
     52 class CanQual {
     53   /// \brief The actual, canonical type.
     54   QualType Stored;
     55 
     56 public:
     57   /// \brief Constructs a NULL canonical type.
     58   CanQual() : Stored() { }
     59 
     60   /// \brief Converting constructor that permits implicit upcasting of
     61   /// canonical type pointers.
     62   template <typename U>
     63   CanQual(const CanQual<U> &Other,
     64           typename std::enable_if<std::is_base_of<T, U>::value, int>::type = 0);
     65 
     66   /// \brief Retrieve the underlying type pointer, which refers to a
     67   /// canonical type.
     68   ///
     69   /// The underlying pointer must not be NULL.
     70   const T *getTypePtr() const { return cast<T>(Stored.getTypePtr()); }
     71 
     72   /// \brief Retrieve the underlying type pointer, which refers to a
     73   /// canonical type, or NULL.
     74   ///
     75   const T *getTypePtrOrNull() const {
     76     return cast_or_null<T>(Stored.getTypePtrOrNull());
     77   }
     78 
     79   /// \brief Implicit conversion to a qualified type.
     80   operator QualType() const { return Stored; }
     81 
     82   /// \brief Implicit conversion to bool.
     83   explicit operator bool() const { return !isNull(); }
     84 
     85   bool isNull() const {
     86     return Stored.isNull();
     87   }
     88 
     89   SplitQualType split() const { return Stored.split(); }
     90 
     91   /// \brief Retrieve a canonical type pointer with a different static type,
     92   /// upcasting or downcasting as needed.
     93   ///
     94   /// The getAs() function is typically used to try to downcast to a
     95   /// more specific (canonical) type in the type system. For example:
     96   ///
     97   /// @code
     98   /// void f(CanQual<Type> T) {
     99   ///   if (CanQual<PointerType> Ptr = T->getAs<PointerType>()) {
    100   ///     // look at Ptr's pointee type
    101   ///   }
    102   /// }
    103   /// @endcode
    104   ///
    105   /// \returns A proxy pointer to the same type, but with the specified
    106   /// static type (@p U). If the dynamic type is not the specified static type
    107   /// or a derived class thereof, a NULL canonical type.
    108   template<typename U> CanProxy<U> getAs() const;
    109 
    110   template<typename U> CanProxy<U> castAs() const;
    111 
    112   /// \brief Overloaded arrow operator that produces a canonical type
    113   /// proxy.
    114   CanProxy<T> operator->() const;
    115 
    116   /// \brief Retrieve all qualifiers.
    117   Qualifiers getQualifiers() const { return Stored.getLocalQualifiers(); }
    118 
    119   /// \brief Retrieve the const/volatile/restrict qualifiers.
    120   unsigned getCVRQualifiers() const { return Stored.getLocalCVRQualifiers(); }
    121 
    122   /// \brief Determines whether this type has any qualifiers
    123   bool hasQualifiers() const { return Stored.hasLocalQualifiers(); }
    124 
    125   bool isConstQualified() const {
    126     return Stored.isLocalConstQualified();
    127   }
    128   bool isVolatileQualified() const {
    129     return Stored.isLocalVolatileQualified();
    130   }
    131   bool isRestrictQualified() const {
    132     return Stored.isLocalRestrictQualified();
    133   }
    134 
    135   /// \brief Determines if this canonical type is furthermore
    136   /// canonical as a parameter.  The parameter-canonicalization
    137   /// process decays arrays to pointers and drops top-level qualifiers.
    138   bool isCanonicalAsParam() const {
    139     return Stored.isCanonicalAsParam();
    140   }
    141 
    142   /// \brief Retrieve the unqualified form of this type.
    143   CanQual<T> getUnqualifiedType() const;
    144 
    145   /// \brief Retrieves a version of this type with const applied.
    146   /// Note that this does not always yield a canonical type.
    147   QualType withConst() const {
    148     return Stored.withConst();
    149   }
    150 
    151   /// \brief Determines whether this canonical type is more qualified than
    152   /// the @p Other canonical type.
    153   bool isMoreQualifiedThan(CanQual<T> Other) const {
    154     return Stored.isMoreQualifiedThan(Other.Stored);
    155   }
    156 
    157   /// \brief Determines whether this canonical type is at least as qualified as
    158   /// the @p Other canonical type.
    159   bool isAtLeastAsQualifiedAs(CanQual<T> Other) const {
    160     return Stored.isAtLeastAsQualifiedAs(Other.Stored);
    161   }
    162 
    163   /// \brief If the canonical type is a reference type, returns the type that
    164   /// it refers to; otherwise, returns the type itself.
    165   CanQual<Type> getNonReferenceType() const;
    166 
    167   /// \brief Retrieve the internal representation of this canonical type.
    168   void *getAsOpaquePtr() const { return Stored.getAsOpaquePtr(); }
    169 
    170   /// \brief Construct a canonical type from its internal representation.
    171   static CanQual<T> getFromOpaquePtr(void *Ptr);
    172 
    173   /// \brief Builds a canonical type from a QualType.
    174   ///
    175   /// This routine is inherently unsafe, because it requires the user to
    176   /// ensure that the given type is a canonical type with the correct
    177   // (dynamic) type.
    178   static CanQual<T> CreateUnsafe(QualType Other);
    179 
    180   void dump() const { Stored.dump(); }
    181 
    182   void Profile(llvm::FoldingSetNodeID &ID) const {
    183     ID.AddPointer(getAsOpaquePtr());
    184   }
    185 };
    186 
    187 template<typename T, typename U>
    188 inline bool operator==(CanQual<T> x, CanQual<U> y) {
    189   return x.getAsOpaquePtr() == y.getAsOpaquePtr();
    190 }
    191 
    192 template<typename T, typename U>
    193 inline bool operator!=(CanQual<T> x, CanQual<U> y) {
    194   return x.getAsOpaquePtr() != y.getAsOpaquePtr();
    195 }
    196 
    197 /// \brief Represents a canonical, potentially-qualified type.
    198 typedef CanQual<Type> CanQualType;
    199 
    200 inline CanQualType Type::getCanonicalTypeUnqualified() const {
    201   return CanQualType::CreateUnsafe(getCanonicalTypeInternal());
    202 }
    203 
    204 inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
    205                                            CanQualType T) {
    206   DB << static_cast<QualType>(T);
    207   return DB;
    208 }
    209 
    210 //----------------------------------------------------------------------------//
    211 // Internal proxy classes used by canonical types
    212 //----------------------------------------------------------------------------//
    213 
    214 #define LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(Accessor)                    \
    215 CanQualType Accessor() const {                                           \
    216 return CanQualType::CreateUnsafe(this->getTypePtr()->Accessor());      \
    217 }
    218 
    219 #define LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Type, Accessor)             \
    220 Type Accessor() const { return this->getTypePtr()->Accessor(); }
    221 
    222 /// \brief Base class of all canonical proxy types, which is responsible for
    223 /// storing the underlying canonical type and providing basic conversions.
    224 template<typename T>
    225 class CanProxyBase {
    226 protected:
    227   CanQual<T> Stored;
    228 
    229 public:
    230   /// \brief Retrieve the pointer to the underlying Type
    231   const T *getTypePtr() const { return Stored.getTypePtr(); }
    232 
    233   /// \brief Implicit conversion to the underlying pointer.
    234   ///
    235   /// Also provides the ability to use canonical type proxies in a Boolean
    236   // context,e.g.,
    237   /// @code
    238   ///   if (CanQual<PointerType> Ptr = T->getAs<PointerType>()) { ... }
    239   /// @endcode
    240   operator const T*() const { return this->Stored.getTypePtrOrNull(); }
    241 
    242   /// \brief Try to convert the given canonical type to a specific structural
    243   /// type.
    244   template<typename U> CanProxy<U> getAs() const {
    245     return this->Stored.template getAs<U>();
    246   }
    247 
    248   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Type::TypeClass, getTypeClass)
    249 
    250   // Type predicates
    251   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjectType)
    252   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIncompleteType)
    253   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIncompleteOrObjectType)
    254   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVariablyModifiedType)
    255   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegerType)
    256   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isEnumeralType)
    257   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBooleanType)
    258   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isCharType)
    259   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isWideCharType)
    260   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegralType)
    261   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegralOrEnumerationType)
    262   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isRealFloatingType)
    263   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isComplexType)
    264   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAnyComplexType)
    265   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isFloatingType)
    266   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isRealType)
    267   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isArithmeticType)
    268   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVoidType)
    269   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isDerivedType)
    270   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isScalarType)
    271   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAggregateType)
    272   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAnyPointerType)
    273   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVoidPointerType)
    274   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isFunctionPointerType)
    275   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isMemberFunctionPointerType)
    276   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isClassType)
    277   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isStructureType)
    278   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isInterfaceType)
    279   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isStructureOrClassType)
    280   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnionType)
    281   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isComplexIntegerType)
    282   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isNullPtrType)
    283   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isDependentType)
    284   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isOverloadableType)
    285   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isArrayType)
    286   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasPointerRepresentation)
    287   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasObjCPointerRepresentation)
    288   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasIntegerRepresentation)
    289   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasSignedIntegerRepresentation)
    290   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasUnsignedIntegerRepresentation)
    291   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasFloatingRepresentation)
    292   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isPromotableIntegerType)
    293   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSignedIntegerType)
    294   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnsignedIntegerType)
    295   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSignedIntegerOrEnumerationType)
    296   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnsignedIntegerOrEnumerationType)
    297   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isConstantSizeType)
    298   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSpecifierType)
    299   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(CXXRecordDecl*, getAsCXXRecordDecl)
    300 
    301   /// \brief Retrieve the proxy-adaptor type.
    302   ///
    303   /// This arrow operator is used when CanProxyAdaptor has been specialized
    304   /// for the given type T. In that case, we reference members of the
    305   /// CanProxyAdaptor specialization. Otherwise, this operator will be hidden
    306   /// by the arrow operator in the primary CanProxyAdaptor template.
    307   const CanProxyAdaptor<T> *operator->() const {
    308     return static_cast<const CanProxyAdaptor<T> *>(this);
    309   }
    310 };
    311 
    312 /// \brief Replacable canonical proxy adaptor class that provides the link
    313 /// between a canonical type and the accessors of the type.
    314 ///
    315 /// The CanProxyAdaptor is a replaceable class template that is instantiated
    316 /// as part of each canonical proxy type. The primary template merely provides
    317 /// redirection to the underlying type (T), e.g., @c PointerType. One can
    318 /// provide specializations of this class template for each underlying type
    319 /// that provide accessors returning canonical types (@c CanQualType) rather
    320 /// than the more typical @c QualType, to propagate the notion of "canonical"
    321 /// through the system.
    322 template<typename T>
    323 struct CanProxyAdaptor : CanProxyBase<T> { };
    324 
    325 /// \brief Canonical proxy type returned when retrieving the members of a
    326 /// canonical type or as the result of the @c CanQual<T>::getAs member
    327 /// function.
    328 ///
    329 /// The CanProxy type mainly exists as a proxy through which operator-> will
    330 /// look to either map down to a raw T* (e.g., PointerType*) or to a proxy
    331 /// type that provides canonical-type access to the fields of the type.
    332 template<typename T>
    333 class CanProxy : public CanProxyAdaptor<T> {
    334 public:
    335   /// \brief Build a NULL proxy.
    336   CanProxy() { }
    337 
    338   /// \brief Build a proxy to the given canonical type.
    339   CanProxy(CanQual<T> Stored) { this->Stored = Stored; }
    340 
    341   /// \brief Implicit conversion to the stored canonical type.
    342   operator CanQual<T>() const { return this->Stored; }
    343 };
    344 
    345 } // end namespace clang
    346 
    347 namespace llvm {
    348 
    349 /// Implement simplify_type for CanQual<T>, so that we can dyn_cast from
    350 /// CanQual<T> to a specific Type class. We're prefer isa/dyn_cast/cast/etc.
    351 /// to return smart pointer (proxies?).
    352 template<typename T>
    353 struct simplify_type< ::clang::CanQual<T> > {
    354   typedef const T *SimpleType;
    355   static SimpleType getSimplifiedValue(::clang::CanQual<T> Val) {
    356     return Val.getTypePtr();
    357   }
    358 };
    359 
    360 // Teach SmallPtrSet that CanQual<T> is "basically a pointer".
    361 template<typename T>
    362 class PointerLikeTypeTraits<clang::CanQual<T> > {
    363 public:
    364   static inline void *getAsVoidPointer(clang::CanQual<T> P) {
    365     return P.getAsOpaquePtr();
    366   }
    367   static inline clang::CanQual<T> getFromVoidPointer(void *P) {
    368     return clang::CanQual<T>::getFromOpaquePtr(P);
    369   }
    370   // qualifier information is encoded in the low bits.
    371   enum { NumLowBitsAvailable = 0 };
    372 };
    373 
    374 } // end namespace llvm
    375 
    376 namespace clang {
    377 
    378 //----------------------------------------------------------------------------//
    379 // Canonical proxy adaptors for canonical type nodes.
    380 //----------------------------------------------------------------------------//
    381 
    382 /// \brief Iterator adaptor that turns an iterator over canonical QualTypes
    383 /// into an iterator over CanQualTypes.
    384 template <typename InputIterator>
    385 struct CanTypeIterator
    386     : llvm::iterator_adaptor_base<
    387           CanTypeIterator<InputIterator>, InputIterator,
    388           typename std::iterator_traits<InputIterator>::iterator_category,
    389           CanQualType,
    390           typename std::iterator_traits<InputIterator>::difference_type,
    391           CanProxy<Type>, CanQualType> {
    392   CanTypeIterator() {}
    393   explicit CanTypeIterator(InputIterator Iter)
    394       : CanTypeIterator::iterator_adaptor_base(std::move(Iter)) {}
    395 
    396   CanQualType operator*() const { return CanQualType::CreateUnsafe(*this->I); }
    397   CanProxy<Type> operator->() const;
    398 };
    399 
    400 template<>
    401 struct CanProxyAdaptor<ComplexType> : public CanProxyBase<ComplexType> {
    402   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    403 };
    404 
    405 template<>
    406 struct CanProxyAdaptor<PointerType> : public CanProxyBase<PointerType> {
    407   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    408 };
    409 
    410 template<>
    411 struct CanProxyAdaptor<BlockPointerType>
    412   : public CanProxyBase<BlockPointerType> {
    413   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    414 };
    415 
    416 template<>
    417 struct CanProxyAdaptor<ReferenceType> : public CanProxyBase<ReferenceType> {
    418   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    419 };
    420 
    421 template<>
    422 struct CanProxyAdaptor<LValueReferenceType>
    423   : public CanProxyBase<LValueReferenceType> {
    424   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    425 };
    426 
    427 template<>
    428 struct CanProxyAdaptor<RValueReferenceType>
    429   : public CanProxyBase<RValueReferenceType> {
    430   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    431 };
    432 
    433 template<>
    434 struct CanProxyAdaptor<MemberPointerType>
    435   : public CanProxyBase<MemberPointerType> {
    436   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    437   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const Type *, getClass)
    438 };
    439 
    440 // CanProxyAdaptors for arrays are intentionally unimplemented because
    441 // they are not safe.
    442 template<> struct CanProxyAdaptor<ArrayType>;
    443 template<> struct CanProxyAdaptor<ConstantArrayType>;
    444 template<> struct CanProxyAdaptor<IncompleteArrayType>;
    445 template<> struct CanProxyAdaptor<VariableArrayType>;
    446 template<> struct CanProxyAdaptor<DependentSizedArrayType>;
    447 
    448 template<>
    449 struct CanProxyAdaptor<DependentSizedExtVectorType>
    450   : public CanProxyBase<DependentSizedExtVectorType> {
    451   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    452   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const Expr *, getSizeExpr)
    453   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getAttributeLoc)
    454 };
    455 
    456 template<>
    457 struct CanProxyAdaptor<VectorType> : public CanProxyBase<VectorType> {
    458   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    459   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumElements)
    460 };
    461 
    462 template<>
    463 struct CanProxyAdaptor<ExtVectorType> : public CanProxyBase<ExtVectorType> {
    464   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    465   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumElements)
    466 };
    467 
    468 template<>
    469 struct CanProxyAdaptor<FunctionType> : public CanProxyBase<FunctionType> {
    470   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getReturnType)
    471   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    472 };
    473 
    474 template<>
    475 struct CanProxyAdaptor<FunctionNoProtoType>
    476   : public CanProxyBase<FunctionNoProtoType> {
    477   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getReturnType)
    478   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    479 };
    480 
    481 template<>
    482 struct CanProxyAdaptor<FunctionProtoType>
    483   : public CanProxyBase<FunctionProtoType> {
    484   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getReturnType)
    485   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    486   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumParams)
    487   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasExtParameterInfos)
    488   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(
    489             ArrayRef<FunctionProtoType::ExtParameterInfo>, getExtParameterInfos)
    490   CanQualType getParamType(unsigned i) const {
    491     return CanQualType::CreateUnsafe(this->getTypePtr()->getParamType(i));
    492   }
    493 
    494   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVariadic)
    495   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getTypeQuals)
    496 
    497   typedef CanTypeIterator<FunctionProtoType::param_type_iterator>
    498   param_type_iterator;
    499 
    500   param_type_iterator param_type_begin() const {
    501     return param_type_iterator(this->getTypePtr()->param_type_begin());
    502   }
    503 
    504   param_type_iterator param_type_end() const {
    505     return param_type_iterator(this->getTypePtr()->param_type_end());
    506   }
    507 
    508   // Note: canonical function types never have exception specifications
    509 };
    510 
    511 template<>
    512 struct CanProxyAdaptor<TypeOfType> : public CanProxyBase<TypeOfType> {
    513   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    514 };
    515 
    516 template<>
    517 struct CanProxyAdaptor<DecltypeType> : public CanProxyBase<DecltypeType> {
    518   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Expr *, getUnderlyingExpr)
    519   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    520 };
    521 
    522 template <>
    523 struct CanProxyAdaptor<UnaryTransformType>
    524     : public CanProxyBase<UnaryTransformType> {
    525   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getBaseType)
    526   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    527   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(UnaryTransformType::UTTKind, getUTTKind)
    528 };
    529 
    530 template<>
    531 struct CanProxyAdaptor<TagType> : public CanProxyBase<TagType> {
    532   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(TagDecl *, getDecl)
    533   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    534 };
    535 
    536 template<>
    537 struct CanProxyAdaptor<RecordType> : public CanProxyBase<RecordType> {
    538   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(RecordDecl *, getDecl)
    539   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    540   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasConstFields)
    541 };
    542 
    543 template<>
    544 struct CanProxyAdaptor<EnumType> : public CanProxyBase<EnumType> {
    545   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(EnumDecl *, getDecl)
    546   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    547 };
    548 
    549 template<>
    550 struct CanProxyAdaptor<TemplateTypeParmType>
    551   : public CanProxyBase<TemplateTypeParmType> {
    552   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getDepth)
    553   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getIndex)
    554   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isParameterPack)
    555   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(TemplateTypeParmDecl *, getDecl)
    556   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(IdentifierInfo *, getIdentifier)
    557 };
    558 
    559 template<>
    560 struct CanProxyAdaptor<ObjCObjectType>
    561   : public CanProxyBase<ObjCObjectType> {
    562   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getBaseType)
    563   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const ObjCInterfaceDecl *,
    564                                       getInterface)
    565   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCUnqualifiedId)
    566   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCUnqualifiedClass)
    567   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedId)
    568   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedClass)
    569 
    570   typedef ObjCObjectPointerType::qual_iterator qual_iterator;
    571   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_begin)
    572   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_end)
    573   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, qual_empty)
    574   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumProtocols)
    575 };
    576 
    577 template<>
    578 struct CanProxyAdaptor<ObjCObjectPointerType>
    579   : public CanProxyBase<ObjCObjectPointerType> {
    580   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    581   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const ObjCInterfaceType *,
    582                                       getInterfaceType)
    583   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCIdType)
    584   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCClassType)
    585   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedIdType)
    586   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedClassType)
    587 
    588   typedef ObjCObjectPointerType::qual_iterator qual_iterator;
    589   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_begin)
    590   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_end)
    591   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, qual_empty)
    592   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumProtocols)
    593 };
    594 
    595 //----------------------------------------------------------------------------//
    596 // Method and function definitions
    597 //----------------------------------------------------------------------------//
    598 template<typename T>
    599 inline CanQual<T> CanQual<T>::getUnqualifiedType() const {
    600   return CanQual<T>::CreateUnsafe(Stored.getLocalUnqualifiedType());
    601 }
    602 
    603 template<typename T>
    604 inline CanQual<Type> CanQual<T>::getNonReferenceType() const {
    605   if (CanQual<ReferenceType> RefType = getAs<ReferenceType>())
    606     return RefType->getPointeeType();
    607   else
    608     return *this;
    609 }
    610 
    611 template<typename T>
    612 CanQual<T> CanQual<T>::getFromOpaquePtr(void *Ptr) {
    613   CanQual<T> Result;
    614   Result.Stored = QualType::getFromOpaquePtr(Ptr);
    615   assert((!Result || Result.Stored.getAsOpaquePtr() == (void*)-1 ||
    616           Result.Stored.isCanonical()) && "Type is not canonical!");
    617   return Result;
    618 }
    619 
    620 template<typename T>
    621 CanQual<T> CanQual<T>::CreateUnsafe(QualType Other) {
    622   assert((Other.isNull() || Other.isCanonical()) && "Type is not canonical!");
    623   assert((Other.isNull() || isa<T>(Other.getTypePtr())) &&
    624          "Dynamic type does not meet the static type's requires");
    625   CanQual<T> Result;
    626   Result.Stored = Other;
    627   return Result;
    628 }
    629 
    630 template<typename T>
    631 template<typename U>
    632 CanProxy<U> CanQual<T>::getAs() const {
    633   static_assert(!TypeIsArrayType<T>::value,
    634                 "ArrayType cannot be used with getAs!");
    635 
    636   if (Stored.isNull())
    637     return CanProxy<U>();
    638 
    639   if (isa<U>(Stored.getTypePtr()))
    640     return CanQual<U>::CreateUnsafe(Stored);
    641 
    642   return CanProxy<U>();
    643 }
    644 
    645 template<typename T>
    646 template<typename U>
    647 CanProxy<U> CanQual<T>::castAs() const {
    648   static_assert(!TypeIsArrayType<U>::value,
    649                 "ArrayType cannot be used with castAs!");
    650 
    651   assert(!Stored.isNull() && isa<U>(Stored.getTypePtr()));
    652   return CanQual<U>::CreateUnsafe(Stored);
    653 }
    654 
    655 template<typename T>
    656 CanProxy<T> CanQual<T>::operator->() const {
    657   return CanProxy<T>(*this);
    658 }
    659 
    660 template <typename InputIterator>
    661 CanProxy<Type> CanTypeIterator<InputIterator>::operator->() const {
    662   return CanProxy<Type>(*this);
    663 }
    664 
    665 }
    666 
    667 
    668 #endif
    669