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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_CANONICAL_TYPE_H
     16 #define LLVM_CLANG_AST_CANONICAL_TYPE_H
     17 
     18 #include "clang/AST/Type.h"
     19 #include "llvm/Support/Casting.h"
     20 #include "llvm/Support/type_traits.h"
     21 #include <iterator>
     22 
     23 namespace clang {
     24 
     25 template<typename T> class CanProxy;
     26 template<typename T> struct CanProxyAdaptor;
     27 
     28 //----------------------------------------------------------------------------//
     29 // Canonical, qualified type template
     30 //----------------------------------------------------------------------------//
     31 
     32 /// \brief Represents a canonical, potentially-qualified type.
     33 ///
     34 /// The CanQual template is a lightweight smart pointer that provides access
     35 /// to the canonical representation of a type, where all typedefs and other
     36 /// syntactic sugar has been eliminated. A CanQualType may also have various
     37 /// qualifiers (const, volatile, restrict) attached to it.
     38 ///
     39 /// The template type parameter @p T is one of the Type classes (PointerType,
     40 /// BuiltinType, etc.). The type stored within @c CanQual<T> will be of that
     41 /// type (or some subclass of that type). The typedef @c CanQualType is just
     42 /// a shorthand for @c CanQual<Type>.
     43 ///
     44 /// An instance of @c CanQual<T> can be implicitly converted to a
     45 /// @c CanQual<U> when T is derived from U, which essentially provides an
     46 /// implicit upcast. For example, @c CanQual<LValueReferenceType> can be
     47 /// converted to @c CanQual<ReferenceType>. Note that any @c CanQual type can
     48 /// be implicitly converted to a QualType, but the reverse operation requires
     49 /// a call to ASTContext::getCanonicalType().
     50 ///
     51 ///
     52 template<typename T = Type>
     53 class CanQual {
     54   /// \brief The actual, canonical type.
     55   QualType Stored;
     56 
     57 public:
     58   /// \brief Constructs a NULL canonical type.
     59   CanQual() : Stored() { }
     60 
     61   /// \brief Converting constructor that permits implicit upcasting of
     62   /// canonical type pointers.
     63   template<typename U>
     64   CanQual(const CanQual<U>& Other,
     65           typename llvm::enable_if<llvm::is_base_of<T, U>, int>::type = 0);
     66 
     67   /// \brief Retrieve the underlying type pointer, which refers to a
     68   /// canonical type.
     69   ///
     70   /// The underlying pointer must not be NULL.
     71   const T *getTypePtr() const { return cast<T>(Stored.getTypePtr()); }
     72 
     73   /// \brief Retrieve the underlying type pointer, which refers to a
     74   /// canonical type, or NULL.
     75   ///
     76   const T *getTypePtrOrNull() const {
     77     return cast_or_null<T>(Stored.getTypePtrOrNull());
     78   }
     79 
     80   /// \brief Implicit conversion to a qualified type.
     81   operator QualType() const { return Stored; }
     82 
     83   /// \brief Implicit conversion to bool.
     84   operator bool() const { return !isNull(); }
     85 
     86   bool isNull() const {
     87     return Stored.isNull();
     88   }
     89 
     90   SplitQualType split() const { return Stored.split(); }
     91 
     92   /// \brief Retrieve a canonical type pointer with a different static type,
     93   /// upcasting or downcasting as needed.
     94   ///
     95   /// The getAs() function is typically used to try to downcast to a
     96   /// more specific (canonical) type in the type system. For example:
     97   ///
     98   /// @code
     99   /// void f(CanQual<Type> T) {
    100   ///   if (CanQual<PointerType> Ptr = T->getAs<PointerType>()) {
    101   ///     // look at Ptr's pointee type
    102   ///   }
    103   /// }
    104   /// @endcode
    105   ///
    106   /// \returns A proxy pointer to the same type, but with the specified
    107   /// static type (@p U). If the dynamic type is not the specified static type
    108   /// or a derived class thereof, a NULL canonical type.
    109   template<typename U> CanProxy<U> getAs() const;
    110 
    111   /// \brief Overloaded arrow operator that produces a canonical type
    112   /// proxy.
    113   CanProxy<T> operator->() const;
    114 
    115   /// \brief Retrieve all qualifiers.
    116   Qualifiers getQualifiers() const { return Stored.getLocalQualifiers(); }
    117 
    118   /// \brief Retrieve the const/volatile/restrict qualifiers.
    119   unsigned getCVRQualifiers() const { return Stored.getLocalCVRQualifiers(); }
    120 
    121   /// \brief Determines whether this type has any qualifiers
    122   bool hasQualifiers() const { return Stored.hasLocalQualifiers(); }
    123 
    124   bool isConstQualified() const {
    125     return Stored.isLocalConstQualified();
    126   }
    127   bool isVolatileQualified() const {
    128     return Stored.isLocalVolatileQualified();
    129   }
    130   bool isRestrictQualified() const {
    131     return Stored.isLocalRestrictQualified();
    132   }
    133 
    134   /// \brief Determines if this canonical type is furthermore
    135   /// canonical as a parameter.  The parameter-canonicalization
    136   /// process decays arrays to pointers and drops top-level qualifiers.
    137   bool isCanonicalAsParam() const {
    138     return Stored.isCanonicalAsParam();
    139   }
    140 
    141   /// \brief Retrieve the unqualified form of this type.
    142   CanQual<T> getUnqualifiedType() const;
    143 
    144   /// \brief Retrieves a version of this type with const applied.
    145   /// Note that this does not always yield a canonical type.
    146   QualType withConst() const {
    147     return Stored.withConst();
    148   }
    149 
    150   /// \brief Determines whether this canonical type is more qualified than
    151   /// the @p Other canonical type.
    152   bool isMoreQualifiedThan(CanQual<T> Other) const {
    153     return Stored.isMoreQualifiedThan(Other.Stored);
    154   }
    155 
    156   /// \brief Determines whether this canonical type is at least as qualified as
    157   /// the @p Other canonical type.
    158   bool isAtLeastAsQualifiedAs(CanQual<T> Other) const {
    159     return Stored.isAtLeastAsQualifiedAs(Other.Stored);
    160   }
    161 
    162   /// \brief If the canonical type is a reference type, returns the type that
    163   /// it refers to; otherwise, returns the type itself.
    164   CanQual<Type> getNonReferenceType() const;
    165 
    166   /// \brief Retrieve the internal representation of this canonical type.
    167   void *getAsOpaquePtr() const { return Stored.getAsOpaquePtr(); }
    168 
    169   /// \brief Construct a canonical type from its internal representation.
    170   static CanQual<T> getFromOpaquePtr(void *Ptr);
    171 
    172   /// \brief Builds a canonical type from a QualType.
    173   ///
    174   /// This routine is inherently unsafe, because it requires the user to
    175   /// ensure that the given type is a canonical type with the correct
    176   // (dynamic) type.
    177   static CanQual<T> CreateUnsafe(QualType Other);
    178 
    179   void dump() const { Stored.dump(); }
    180 
    181   void Profile(llvm::FoldingSetNodeID &ID) const {
    182     ID.AddPointer(getAsOpaquePtr());
    183   }
    184 };
    185 
    186 template<typename T, typename U>
    187 inline bool operator==(CanQual<T> x, CanQual<U> y) {
    188   return x.getAsOpaquePtr() == y.getAsOpaquePtr();
    189 }
    190 
    191 template<typename T, typename U>
    192 inline bool operator!=(CanQual<T> x, CanQual<U> y) {
    193   return x.getAsOpaquePtr() != y.getAsOpaquePtr();
    194 }
    195 
    196 /// \brief Represents a canonical, potentially-qualified type.
    197 typedef CanQual<Type> CanQualType;
    198 
    199 inline CanQualType Type::getCanonicalTypeUnqualified() const {
    200   return CanQualType::CreateUnsafe(getCanonicalTypeInternal());
    201 }
    202 
    203 inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
    204                                            CanQualType T) {
    205   DB << static_cast<QualType>(T);
    206   return DB;
    207 }
    208 
    209 //----------------------------------------------------------------------------//
    210 // Internal proxy classes used by canonical types
    211 //----------------------------------------------------------------------------//
    212 
    213 #define LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(Accessor)                    \
    214 CanQualType Accessor() const {                                           \
    215 return CanQualType::CreateUnsafe(this->getTypePtr()->Accessor());      \
    216 }
    217 
    218 #define LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Type, Accessor)             \
    219 Type Accessor() const { return this->getTypePtr()->Accessor(); }
    220 
    221 /// \brief Base class of all canonical proxy types, which is responsible for
    222 /// storing the underlying canonical type and providing basic conversions.
    223 template<typename T>
    224 class CanProxyBase {
    225 protected:
    226   CanQual<T> Stored;
    227 
    228 public:
    229   /// \brief Retrieve the pointer to the underlying Type
    230   const T *getTypePtr() const { return Stored.getTypePtr(); }
    231 
    232   /// \brief Implicit conversion to the underlying pointer.
    233   ///
    234   /// Also provides the ability to use canonical type proxies in a Boolean
    235   // context,e.g.,
    236   /// @code
    237   ///   if (CanQual<PointerType> Ptr = T->getAs<PointerType>()) { ... }
    238   /// @endcode
    239   operator const T*() const { return this->Stored.getTypePtrOrNull(); }
    240 
    241   /// \brief Try to convert the given canonical type to a specific structural
    242   /// type.
    243   template<typename U> CanProxy<U> getAs() const {
    244     return this->Stored.template getAs<U>();
    245   }
    246 
    247   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Type::TypeClass, getTypeClass)
    248 
    249   // Type predicates
    250   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjectType)
    251   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIncompleteType)
    252   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIncompleteOrObjectType)
    253   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVariablyModifiedType)
    254   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegerType)
    255   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isEnumeralType)
    256   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBooleanType)
    257   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isCharType)
    258   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isWideCharType)
    259   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegralType)
    260   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isIntegralOrEnumerationType)
    261   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isRealFloatingType)
    262   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isComplexType)
    263   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAnyComplexType)
    264   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isFloatingType)
    265   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isRealType)
    266   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isArithmeticType)
    267   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVoidType)
    268   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isDerivedType)
    269   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isScalarType)
    270   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAggregateType)
    271   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isAnyPointerType)
    272   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVoidPointerType)
    273   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isFunctionPointerType)
    274   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isMemberFunctionPointerType)
    275   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isClassType)
    276   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isStructureType)
    277   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isStructureOrClassType)
    278   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnionType)
    279   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isComplexIntegerType)
    280   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isNullPtrType)
    281   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isDependentType)
    282   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isOverloadableType)
    283   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isArrayType)
    284   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasPointerRepresentation)
    285   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasObjCPointerRepresentation)
    286   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasIntegerRepresentation)
    287   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasSignedIntegerRepresentation)
    288   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasUnsignedIntegerRepresentation)
    289   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasFloatingRepresentation)
    290   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isPromotableIntegerType)
    291   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSignedIntegerType)
    292   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnsignedIntegerType)
    293   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSignedIntegerOrEnumerationType)
    294   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isUnsignedIntegerOrEnumerationType)
    295   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isConstantSizeType)
    296   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isSpecifierType)
    297   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(CXXRecordDecl*, getAsCXXRecordDecl)
    298 
    299   /// \brief Retrieve the proxy-adaptor type.
    300   ///
    301   /// This arrow operator is used when CanProxyAdaptor has been specialized
    302   /// for the given type T. In that case, we reference members of the
    303   /// CanProxyAdaptor specialization. Otherwise, this operator will be hidden
    304   /// by the arrow operator in the primary CanProxyAdaptor template.
    305   const CanProxyAdaptor<T> *operator->() const {
    306     return static_cast<const CanProxyAdaptor<T> *>(this);
    307   }
    308 };
    309 
    310 /// \brief Replacable canonical proxy adaptor class that provides the link
    311 /// between a canonical type and the accessors of the type.
    312 ///
    313 /// The CanProxyAdaptor is a replaceable class template that is instantiated
    314 /// as part of each canonical proxy type. The primary template merely provides
    315 /// redirection to the underlying type (T), e.g., @c PointerType. One can
    316 /// provide specializations of this class template for each underlying type
    317 /// that provide accessors returning canonical types (@c CanQualType) rather
    318 /// than the more typical @c QualType, to propagate the notion of "canonical"
    319 /// through the system.
    320 template<typename T>
    321 struct CanProxyAdaptor : CanProxyBase<T> { };
    322 
    323 /// \brief Canonical proxy type returned when retrieving the members of a
    324 /// canonical type or as the result of the @c CanQual<T>::getAs member
    325 /// function.
    326 ///
    327 /// The CanProxy type mainly exists as a proxy through which operator-> will
    328 /// look to either map down to a raw T* (e.g., PointerType*) or to a proxy
    329 /// type that provides canonical-type access to the fields of the type.
    330 template<typename T>
    331 class CanProxy : public CanProxyAdaptor<T> {
    332 public:
    333   /// \brief Build a NULL proxy.
    334   CanProxy() { }
    335 
    336   /// \brief Build a proxy to the given canonical type.
    337   CanProxy(CanQual<T> Stored) { this->Stored = Stored; }
    338 
    339   /// \brief Implicit conversion to the stored canonical type.
    340   operator CanQual<T>() const { return this->Stored; }
    341 };
    342 
    343 } // end namespace clang
    344 
    345 namespace llvm {
    346 
    347 /// Implement simplify_type for CanQual<T>, so that we can dyn_cast from
    348 /// CanQual<T> to a specific Type class. We're prefer isa/dyn_cast/cast/etc.
    349 /// to return smart pointer (proxies?).
    350 template<typename T>
    351 struct simplify_type<const ::clang::CanQual<T> > {
    352   typedef const T *SimpleType;
    353   static SimpleType getSimplifiedValue(const ::clang::CanQual<T> &Val) {
    354     return Val.getTypePtr();
    355   }
    356 };
    357 template<typename T>
    358 struct simplify_type< ::clang::CanQual<T> >
    359 : public simplify_type<const ::clang::CanQual<T> > {};
    360 
    361 // Teach SmallPtrSet that CanQual<T> is "basically a pointer".
    362 template<typename T>
    363 class PointerLikeTypeTraits<clang::CanQual<T> > {
    364 public:
    365   static inline void *getAsVoidPointer(clang::CanQual<T> P) {
    366     return P.getAsOpaquePtr();
    367   }
    368   static inline clang::CanQual<T> getFromVoidPointer(void *P) {
    369     return clang::CanQual<T>::getFromOpaquePtr(P);
    370   }
    371   // qualifier information is encoded in the low bits.
    372   enum { NumLowBitsAvailable = 0 };
    373 };
    374 
    375 } // end namespace llvm
    376 
    377 namespace clang {
    378 
    379 //----------------------------------------------------------------------------//
    380 // Canonical proxy adaptors for canonical type nodes.
    381 //----------------------------------------------------------------------------//
    382 
    383 /// \brief Iterator adaptor that turns an iterator over canonical QualTypes
    384 /// into an iterator over CanQualTypes.
    385 template<typename InputIterator>
    386 class CanTypeIterator {
    387   InputIterator Iter;
    388 
    389 public:
    390   typedef CanQualType    value_type;
    391   typedef value_type     reference;
    392   typedef CanProxy<Type> pointer;
    393   typedef typename std::iterator_traits<InputIterator>::difference_type
    394     difference_type;
    395   typedef typename std::iterator_traits<InputIterator>::iterator_category
    396     iterator_category;
    397 
    398   CanTypeIterator() : Iter() { }
    399   explicit CanTypeIterator(InputIterator Iter) : Iter(Iter) { }
    400 
    401   // Input iterator
    402   reference operator*() const {
    403     return CanQualType::CreateUnsafe(*Iter);
    404   }
    405 
    406   pointer operator->() const;
    407 
    408   CanTypeIterator &operator++() {
    409     ++Iter;
    410     return *this;
    411   }
    412 
    413   CanTypeIterator operator++(int) {
    414     CanTypeIterator Tmp(*this);
    415     ++Iter;
    416     return Tmp;
    417   }
    418 
    419   friend bool operator==(const CanTypeIterator& X, const CanTypeIterator &Y) {
    420     return X.Iter == Y.Iter;
    421   }
    422   friend bool operator!=(const CanTypeIterator& X, const CanTypeIterator &Y) {
    423     return X.Iter != Y.Iter;
    424   }
    425 
    426   // Bidirectional iterator
    427   CanTypeIterator &operator--() {
    428     --Iter;
    429     return *this;
    430   }
    431 
    432   CanTypeIterator operator--(int) {
    433     CanTypeIterator Tmp(*this);
    434     --Iter;
    435     return Tmp;
    436   }
    437 
    438   // Random access iterator
    439   reference operator[](difference_type n) const {
    440     return CanQualType::CreateUnsafe(Iter[n]);
    441   }
    442 
    443   CanTypeIterator &operator+=(difference_type n) {
    444     Iter += n;
    445     return *this;
    446   }
    447 
    448   CanTypeIterator &operator-=(difference_type n) {
    449     Iter -= n;
    450     return *this;
    451   }
    452 
    453   friend CanTypeIterator operator+(CanTypeIterator X, difference_type n) {
    454     X += n;
    455     return X;
    456   }
    457 
    458   friend CanTypeIterator operator+(difference_type n, CanTypeIterator X) {
    459     X += n;
    460     return X;
    461   }
    462 
    463   friend CanTypeIterator operator-(CanTypeIterator X, difference_type n) {
    464     X -= n;
    465     return X;
    466   }
    467 
    468   friend difference_type operator-(const CanTypeIterator &X,
    469                                    const CanTypeIterator &Y) {
    470     return X - Y;
    471   }
    472 };
    473 
    474 template<>
    475 struct CanProxyAdaptor<ComplexType> : public CanProxyBase<ComplexType> {
    476   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    477 };
    478 
    479 template<>
    480 struct CanProxyAdaptor<PointerType> : public CanProxyBase<PointerType> {
    481   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    482 };
    483 
    484 template<>
    485 struct CanProxyAdaptor<BlockPointerType>
    486   : public CanProxyBase<BlockPointerType> {
    487   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    488 };
    489 
    490 template<>
    491 struct CanProxyAdaptor<ReferenceType> : public CanProxyBase<ReferenceType> {
    492   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    493 };
    494 
    495 template<>
    496 struct CanProxyAdaptor<LValueReferenceType>
    497   : public CanProxyBase<LValueReferenceType> {
    498   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    499 };
    500 
    501 template<>
    502 struct CanProxyAdaptor<RValueReferenceType>
    503   : public CanProxyBase<RValueReferenceType> {
    504   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    505 };
    506 
    507 template<>
    508 struct CanProxyAdaptor<MemberPointerType>
    509   : public CanProxyBase<MemberPointerType> {
    510   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    511   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const Type *, getClass)
    512 };
    513 
    514 template<>
    515 struct CanProxyAdaptor<ArrayType> : public CanProxyBase<ArrayType> {
    516   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    517   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(ArrayType::ArraySizeModifier,
    518                                       getSizeModifier)
    519   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Qualifiers, getIndexTypeQualifiers)
    520 };
    521 
    522 template<>
    523 struct CanProxyAdaptor<ConstantArrayType>
    524   : public CanProxyBase<ConstantArrayType> {
    525   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    526   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(ArrayType::ArraySizeModifier,
    527                                       getSizeModifier)
    528   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Qualifiers, getIndexTypeQualifiers)
    529   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const llvm::APInt &, getSize)
    530 };
    531 
    532 template<>
    533 struct CanProxyAdaptor<IncompleteArrayType>
    534   : public CanProxyBase<IncompleteArrayType> {
    535   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    536   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(ArrayType::ArraySizeModifier,
    537                                       getSizeModifier)
    538   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Qualifiers, getIndexTypeQualifiers)
    539 };
    540 
    541 template<>
    542 struct CanProxyAdaptor<VariableArrayType>
    543   : public CanProxyBase<VariableArrayType> {
    544   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    545   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(ArrayType::ArraySizeModifier,
    546                                       getSizeModifier)
    547   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Qualifiers, getIndexTypeQualifiers)
    548   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Expr *, getSizeExpr)
    549   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceRange, getBracketsRange)
    550   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getLBracketLoc)
    551   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getRBracketLoc)
    552 };
    553 
    554 template<>
    555 struct CanProxyAdaptor<DependentSizedArrayType>
    556   : public CanProxyBase<DependentSizedArrayType> {
    557   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    558   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Expr *, getSizeExpr)
    559   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceRange, getBracketsRange)
    560   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getLBracketLoc)
    561   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getRBracketLoc)
    562 };
    563 
    564 template<>
    565 struct CanProxyAdaptor<DependentSizedExtVectorType>
    566   : public CanProxyBase<DependentSizedExtVectorType> {
    567   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    568   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const Expr *, getSizeExpr)
    569   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(SourceLocation, getAttributeLoc)
    570 };
    571 
    572 template<>
    573 struct CanProxyAdaptor<VectorType> : public CanProxyBase<VectorType> {
    574   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    575   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumElements)
    576 };
    577 
    578 template<>
    579 struct CanProxyAdaptor<ExtVectorType> : public CanProxyBase<ExtVectorType> {
    580   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getElementType)
    581   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumElements)
    582 };
    583 
    584 template<>
    585 struct CanProxyAdaptor<FunctionType> : public CanProxyBase<FunctionType> {
    586   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getResultType)
    587   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    588 };
    589 
    590 template<>
    591 struct CanProxyAdaptor<FunctionNoProtoType>
    592   : public CanProxyBase<FunctionNoProtoType> {
    593   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getResultType)
    594   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    595 };
    596 
    597 template<>
    598 struct CanProxyAdaptor<FunctionProtoType>
    599   : public CanProxyBase<FunctionProtoType> {
    600   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getResultType)
    601   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(FunctionType::ExtInfo, getExtInfo)
    602   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumArgs)
    603   CanQualType getArgType(unsigned i) const {
    604     return CanQualType::CreateUnsafe(this->getTypePtr()->getArgType(i));
    605   }
    606 
    607   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isVariadic)
    608   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getTypeQuals)
    609 
    610   typedef CanTypeIterator<FunctionProtoType::arg_type_iterator>
    611     arg_type_iterator;
    612 
    613   arg_type_iterator arg_type_begin() const {
    614     return arg_type_iterator(this->getTypePtr()->arg_type_begin());
    615   }
    616 
    617   arg_type_iterator arg_type_end() const {
    618     return arg_type_iterator(this->getTypePtr()->arg_type_end());
    619   }
    620 
    621   // Note: canonical function types never have exception specifications
    622 };
    623 
    624 template<>
    625 struct CanProxyAdaptor<TypeOfType> : public CanProxyBase<TypeOfType> {
    626   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    627 };
    628 
    629 template<>
    630 struct CanProxyAdaptor<DecltypeType> : public CanProxyBase<DecltypeType> {
    631   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(Expr *, getUnderlyingExpr)
    632   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    633 };
    634 
    635 template <>
    636 struct CanProxyAdaptor<UnaryTransformType>
    637     : public CanProxyBase<UnaryTransformType> {
    638   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getBaseType)
    639   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getUnderlyingType)
    640   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(UnaryTransformType::UTTKind, getUTTKind)
    641 };
    642 
    643 template<>
    644 struct CanProxyAdaptor<TagType> : public CanProxyBase<TagType> {
    645   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(TagDecl *, getDecl)
    646   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    647 };
    648 
    649 template<>
    650 struct CanProxyAdaptor<RecordType> : public CanProxyBase<RecordType> {
    651   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(RecordDecl *, getDecl)
    652   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    653   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, hasConstFields)
    654 };
    655 
    656 template<>
    657 struct CanProxyAdaptor<EnumType> : public CanProxyBase<EnumType> {
    658   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(EnumDecl *, getDecl)
    659   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isBeingDefined)
    660 };
    661 
    662 template<>
    663 struct CanProxyAdaptor<TemplateTypeParmType>
    664   : public CanProxyBase<TemplateTypeParmType> {
    665   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getDepth)
    666   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getIndex)
    667   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isParameterPack)
    668   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(TemplateTypeParmDecl *, getDecl)
    669   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(IdentifierInfo *, getIdentifier)
    670 };
    671 
    672 template<>
    673 struct CanProxyAdaptor<ObjCObjectType>
    674   : public CanProxyBase<ObjCObjectType> {
    675   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getBaseType)
    676   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const ObjCInterfaceDecl *,
    677                                       getInterface)
    678   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCUnqualifiedId)
    679   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCUnqualifiedClass)
    680   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedId)
    681   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedClass)
    682 
    683   typedef ObjCObjectPointerType::qual_iterator qual_iterator;
    684   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_begin)
    685   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_end)
    686   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, qual_empty)
    687   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumProtocols)
    688 };
    689 
    690 template<>
    691 struct CanProxyAdaptor<ObjCObjectPointerType>
    692   : public CanProxyBase<ObjCObjectPointerType> {
    693   LLVM_CLANG_CANPROXY_TYPE_ACCESSOR(getPointeeType)
    694   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(const ObjCInterfaceType *,
    695                                       getInterfaceType)
    696   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCIdType)
    697   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCClassType)
    698   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedIdType)
    699   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, isObjCQualifiedClassType)
    700 
    701   typedef ObjCObjectPointerType::qual_iterator qual_iterator;
    702   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_begin)
    703   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(qual_iterator, qual_end)
    704   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(bool, qual_empty)
    705   LLVM_CLANG_CANPROXY_SIMPLE_ACCESSOR(unsigned, getNumProtocols)
    706 };
    707 
    708 //----------------------------------------------------------------------------//
    709 // Method and function definitions
    710 //----------------------------------------------------------------------------//
    711 template<typename T>
    712 inline CanQual<T> CanQual<T>::getUnqualifiedType() const {
    713   return CanQual<T>::CreateUnsafe(Stored.getLocalUnqualifiedType());
    714 }
    715 
    716 template<typename T>
    717 inline CanQual<Type> CanQual<T>::getNonReferenceType() const {
    718   if (CanQual<ReferenceType> RefType = getAs<ReferenceType>())
    719     return RefType->getPointeeType();
    720   else
    721     return *this;
    722 }
    723 
    724 template<typename T>
    725 CanQual<T> CanQual<T>::getFromOpaquePtr(void *Ptr) {
    726   CanQual<T> Result;
    727   Result.Stored = QualType::getFromOpaquePtr(Ptr);
    728   assert((!Result || Result.Stored.getAsOpaquePtr() == (void*)-1 ||
    729           Result.Stored.isCanonical()) && "Type is not canonical!");
    730   return Result;
    731 }
    732 
    733 template<typename T>
    734 CanQual<T> CanQual<T>::CreateUnsafe(QualType Other) {
    735   assert((Other.isNull() || Other.isCanonical()) && "Type is not canonical!");
    736   assert((Other.isNull() || isa<T>(Other.getTypePtr())) &&
    737          "Dynamic type does not meet the static type's requires");
    738   CanQual<T> Result;
    739   Result.Stored = Other;
    740   return Result;
    741 }
    742 
    743 template<typename T>
    744 template<typename U>
    745 CanProxy<U> CanQual<T>::getAs() const {
    746   if (Stored.isNull())
    747     return CanProxy<U>();
    748 
    749   if (isa<U>(Stored.getTypePtr()))
    750     return CanQual<U>::CreateUnsafe(Stored);
    751 
    752   return CanProxy<U>();
    753 }
    754 
    755 template<typename T>
    756 CanProxy<T> CanQual<T>::operator->() const {
    757   return CanProxy<T>(*this);
    758 }
    759 
    760 template<typename InputIterator>
    761 typename CanTypeIterator<InputIterator>::pointer
    762 CanTypeIterator<InputIterator>::operator->() const {
    763   return CanProxy<Type>(*this);
    764 }
    765 
    766 }
    767 
    768 
    769 #endif // LLVM_CLANG_AST_CANONICAL_TYPE_H
    770