Predicate to detect when a RecordDecl is really the injected-class-name

llvm-svn: 67687

clang/include/clang/AST/Decl.h

@@ -1113,6 +1113,21 @@ public:
     AnonymousStructOrUnion = Anon;
   }
 
+  /// \brief Determines whether this declaration represents the
+  /// injected class name.
+  ///
+  /// The injected class name in C++ is the name of the class that
+  /// appears inside the class itself. For example:
+  ///
+  /// \code
+  /// struct C {
+  ///   // C is implicitly declared here as a synonym for the class name.
+  /// };
+  ///
+  /// C::C c; // same as "C c;"
+  /// \endcode
+  bool isInjectedClassName() const;
+
   /// getDefinition - Returns the RecordDecl that actually defines this 
   ///  struct/union/class.  When determining whether or not a struct/union/class
   ///  is completely defined, one should use this method as opposed to

clang/lib/AST/Decl.cpp

@@ -491,6 +491,11 @@ void RecordDecl::Destroy(ASTContext& C) {
   TagDecl::Destroy(C);
 }
 
+bool RecordDecl::isInjectedClassName() const {
+  return isImplicit() && getDeclName() && getDeclContext()->isRecord() && 
+    cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
+}
+
 /// completeDefinition - Notes that the definition of this type is now
 /// complete.
 void RecordDecl::completeDefinition(ASTContext& C) {

clang/lib/Sema/SemaDecl.cpp

@@ -3398,6 +3398,8 @@ void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) {
                                 Record->getIdentifier(), Record);
       InjectedClassName->setImplicit();
       PushOnScopeChains(InjectedClassName, S);
+      assert(InjectedClassName->isInjectedClassName() && 
+             "Broken injected-class-name");
     }
   }
 }