Implement access checking for the "delete" operator. Fixes PR9050,

from Alex Miller!

llvm-svn: 124663

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -564,6 +564,9 @@ def err_access_field: Error<
 def err_access_ctor_field :
     Error<"field of type %1 has %select{private|protected}2 constructor">,
     AccessControl;
+def err_access_dtor : Error<
+  "calling a %select{private|protected}1 destructor of class %0">, 
+  AccessControl;
 def err_access_dtor_base :
     Error<"base class %0 has %select{private|protected}1 destructor">,
     AccessControl;

clang/lib/Sema/SemaExprCXX.cpp

@@ -1687,7 +1687,15 @@ Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
 
     MarkDeclarationReferenced(StartLoc, OperatorDelete);
     
-    // FIXME: Check access and ambiguity of operator delete and destructor.
+    // Check access and ambiguity of operator delete and destructor.
+    if (const RecordType *RT = PointeeElem->getAs<RecordType>()) {
+      CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
+      if (CXXDestructorDecl *Dtor = LookupDestructor(RD)) {
+          CheckDestructorAccess(Ex->getExprLoc(), Dtor, 
+                      PDiag(diag::err_access_dtor) << PointeeElem);
+      }
+    }
+
   }
 
   return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,

clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p1.cpp

@@ -89,6 +89,7 @@ namespace test2 {
 
 namespace test3 {
   class A {
+  public:
     ~A();
   };
 

clang/test/CXX/expr/expr.unary/expr.delete/p5.cpp

@@ -24,11 +24,23 @@ void f0(T2_A *a) { T2_C x; x.f0(a); }
 class T2_A { };
 
 // An alternate version of the same.
-//
-// FIXME: Revisit this case when we have access control.
 class T3_A;
 template<typename T>
-struct T3_B { void f0(T *a) { delete a; } };
-struct T3_C { T3_B<T3_A> x; void f0(T3_A *a) { x.f0(a); } };
+struct T3_B { 
+  void f0(T *a) { 
+    delete a; // expected-error{{calling a private destructor of class 'T3_A'}}
+  } 
+};
+
+struct T3_C { 
+  T3_B<T3_A> x; 
+  void f0(T3_A *a) { 
+    x.f0(a); // expected-note{{in instantiation of member function 'T3_B<T3_A>::f0' requested here}}
+  } 
+};
+
 void f0(T3_A *a) { T3_C x; x.f0(a); }
-class T3_A { private: ~T3_A(); };
+class T3_A { 
+private: 
+  ~T3_A(); // expected-note{{declared private here}}
+};

clang/test/SemaCXX/new-delete.cpp

@@ -234,6 +234,17 @@ void f(X14 *x14a, X14 *x14b) {
   delete x14a;
 }
 
+class X15 {
+private:
+  X15(); // expected-note {{declared private here}}
+  ~X15(); // expected-note {{declared private here}}
+};
+
+void f(X15* x) {
+  new X15(); // expected-error {{calling a private constructor}}
+  delete x; // expected-error {{calling a private destructor}}
+}
+
 namespace PR5918 { // Look for template operator new overloads.
   struct S { template<typename T> static void* operator new(size_t, T); };
   void test() {