r279351 - [NFC] Add a class ObjCProtocolQualifiers to wrap APIs for ObjC protocol list.

[Manman Ren via cfe-commits]

Author: mren
Date: Fri Aug 19 19:04:21 2016
New Revision: 279351

URL: http://llvm.org/viewvc/llvm-project?rev=279351&view=rev
Log:
[NFC] Add a class ObjCProtocolQualifiers to wrap APIs for ObjC protocol list.

This is in preparation of adding a new type class ObjCTypeParamType that
can take protocol qualifiers. ObjCProtocolQualifiers will be shared between
ObjCObjectType and ObjCTypeParamType.
    
rdar://24619481
rdar://25060179

Differential Revision: http://reviews.llvm.org/D23078

Modified:
    cfe/trunk/include/clang/AST/Type.h
    cfe/trunk/lib/AST/Type.cpp

Modified: cfe/trunk/include/clang/AST/Type.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/Type.h?rev=279351&r1=279350&r2=279351&view=diff
==============================================================================
--- cfe/trunk/include/clang/AST/Type.h (original)
+++ cfe/trunk/include/clang/AST/Type.h Fri Aug 19 19:04:21 2016
@@ -4699,6 +4699,59 @@ public:
   }
 };
 
+/// This class wraps the list of protocol qualifiers. For types that can
+/// take ObjC protocol qualifers, they can subclass this class.
+template <class T>
+class ObjCProtocolQualifiers {
+protected:
+  ObjCProtocolQualifiers() {}
+  ObjCProtocolDecl * const *getProtocolStorage() const {
+    return const_cast<ObjCProtocolQualifiers*>(this)->getProtocolStorage();
+  }
+
+  ObjCProtocolDecl **getProtocolStorage() {
+    return static_cast<T*>(this)->getProtocolStorageImpl();
+  }
+  void setNumProtocols(unsigned N) {
+    static_cast<T*>(this)->setNumProtocolsImpl(N);
+  }
+  void initialize(ArrayRef<ObjCProtocolDecl *> protocols) {
+    setNumProtocols(protocols.size());
+    assert(getNumProtocols() == protocols.size() &&
+           "bitfield overflow in protocol count");
+    if (!protocols.empty())
+      memcpy(getProtocolStorage(), protocols.data(),
+             protocols.size() * sizeof(ObjCProtocolDecl*));
+  }
+
+public:
+  typedef ObjCProtocolDecl * const *qual_iterator;
+  typedef llvm::iterator_range<qual_iterator> qual_range;
+
+  qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
+  qual_iterator qual_begin() const { return getProtocolStorage(); }
+  qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); }
+
+  bool qual_empty() const { return getNumProtocols() == 0; }
+
+  /// Return the number of qualifying protocols in this type, or 0 if
+  /// there are none.
+  unsigned getNumProtocols() const {
+    return static_cast<const T*>(this)->getNumProtocolsImpl();
+  }
+
+  /// Fetch a protocol by index.
+  ObjCProtocolDecl *getProtocol(unsigned I) const {
+    assert(I < getNumProtocols() && "Out-of-range protocol access");
+    return qual_begin()[I];
+  }
+
+  /// Retrieve all of the protocol qualifiers.
+  ArrayRef<ObjCProtocolDecl *> getProtocols() const {
+    return ArrayRef<ObjCProtocolDecl *>(qual_begin(), getNumProtocols());
+  }
+};
+
 /// Represents a class type in Objective C.
 ///
 /// Every Objective C type is a combination of a base type, a set of
@@ -4727,7 +4780,9 @@ public:
 /// 'id<P>' is an ObjCObjectPointerType whose pointee is an ObjCObjectType
 /// with base BuiltinType::ObjCIdType and protocol list [P].  Eventually
 /// this should get its own sugar class to better represent the source.
-class ObjCObjectType : public Type {
+class ObjCObjectType : public Type,
+                       public ObjCProtocolQualifiers<ObjCObjectType> {
+  friend class ObjCProtocolQualifiers;
   // ObjCObjectType.NumTypeArgs - the number of type arguments stored
   // after the ObjCObjectPointerType node.
   // ObjCObjectType.NumProtocols - the number of protocols stored
@@ -4747,16 +4802,20 @@ class ObjCObjectType : public Type {
   mutable llvm::PointerIntPair<const ObjCObjectType *, 1, bool>
     CachedSuperClassType;
 
-  ObjCProtocolDecl * const *getProtocolStorage() const {
-    return const_cast<ObjCObjectType*>(this)->getProtocolStorage();
-  }
-
   QualType *getTypeArgStorage();
   const QualType *getTypeArgStorage() const {
     return const_cast<ObjCObjectType *>(this)->getTypeArgStorage();
   }
 
-  ObjCProtocolDecl **getProtocolStorage();
+  ObjCProtocolDecl **getProtocolStorageImpl();
+  /// Return the number of qualifying protocols in this interface type,
+  /// or 0 if there are none.
+  unsigned getNumProtocolsImpl() const {
+    return ObjCObjectTypeBits.NumProtocols;
+  }
+  void setNumProtocolsImpl(unsigned N) {
+    ObjCObjectTypeBits.NumProtocols = N;
+  }
 
 protected:
   ObjCObjectType(QualType Canonical, QualType Base,
@@ -4833,30 +4892,6 @@ public:
                               ObjCObjectTypeBits.NumTypeArgs);
   }
 
-  typedef ObjCProtocolDecl * const *qual_iterator;
-  typedef llvm::iterator_range<qual_iterator> qual_range;
-
-  qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
-  qual_iterator qual_begin() const { return getProtocolStorage(); }
-  qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); }
-
-  bool qual_empty() const { return getNumProtocols() == 0; }
-
-  /// Return the number of qualifying protocols in this interface type,
-  /// or 0 if there are none.
-  unsigned getNumProtocols() const { return ObjCObjectTypeBits.NumProtocols; }
-
-  /// Fetch a protocol by index.
-  ObjCProtocolDecl *getProtocol(unsigned I) const {
-    assert(I < getNumProtocols() && "Out-of-range protocol access");
-    return qual_begin()[I];
-  }
-
-  /// Retrieve all of the protocol qualifiers.
-  ArrayRef<ObjCProtocolDecl *> getProtocols() const {
-    return ArrayRef<ObjCProtocolDecl *>(qual_begin(), getNumProtocols());
-  }
-
   /// Whether this is a "__kindof" type as written.
   bool isKindOfTypeAsWritten() const { return ObjCObjectTypeBits.IsKindOf; }
 
@@ -4919,7 +4954,7 @@ inline QualType *ObjCObjectType::getType
   return reinterpret_cast<QualType *>(static_cast<ObjCObjectTypeImpl*>(this)+1);
 }
 
-inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorage() {
+inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorageImpl() {
     return reinterpret_cast<ObjCProtocolDecl**>(
              getTypeArgStorage() + ObjCObjectTypeBits.NumTypeArgs);
 }

Modified: cfe/trunk/lib/AST/Type.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/Type.cpp?rev=279351&r1=279350&r2=279351&view=diff
==============================================================================
--- cfe/trunk/lib/AST/Type.cpp (original)
+++ cfe/trunk/lib/AST/Type.cpp Fri Aug 19 19:04:21 2016
@@ -546,15 +546,9 @@ ObjCObjectType::ObjCObjectType(QualType
   ObjCObjectTypeBits.NumTypeArgs = typeArgs.size();
   assert(getTypeArgsAsWritten().size() == typeArgs.size() &&
          "bitfield overflow in type argument count");
-  ObjCObjectTypeBits.NumProtocols = protocols.size();
-  assert(getNumProtocols() == protocols.size() &&
-         "bitfield overflow in protocol count");
   if (!typeArgs.empty())
     memcpy(getTypeArgStorage(), typeArgs.data(),
            typeArgs.size() * sizeof(QualType));
-  if (!protocols.empty())
-    memcpy(getProtocolStorage(), protocols.data(),
-           protocols.size() * sizeof(ObjCProtocolDecl*));
 
   for (auto typeArg : typeArgs) {
     if (typeArg->isDependentType())
@@ -565,6 +559,9 @@ ObjCObjectType::ObjCObjectType(QualType
     if (typeArg->containsUnexpandedParameterPack())
       setContainsUnexpandedParameterPack();
   }
+  // Initialize the protocol qualifiers. The protocol storage is known
+  // after we set number of type arguments.
+  initialize(protocols);
 }
 
 bool ObjCObjectType::isSpecialized() const {