From b154ecafa62fa6cce2c3eedcfec2baa45f343580 Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Tue, 21 Jul 2009 15:28:50 +0000
Subject: [PATCH] Diagnose when a destructor uses a unrelated class type as its
 name.

llvm-svn: 76577
---
 clang/include/clang/Basic/DiagnosticSemaKinds.td |  2 ++
 clang/lib/Sema/SemaDecl.cpp                      | 10 ++++++++++
 clang/test/SemaCXX/destructor.cpp                |  6 ++++++
 3 files changed, 18 insertions(+)

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index cfca62acaa4a..4de3a8489f1c 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -385,6 +385,8 @@ def err_destructor_with_params : Error<"destructor cannot have any parameters">;
 def err_destructor_variadic : Error<"destructor cannot be variadic">;
 def err_destructor_typedef_name : Error<
   "destructor cannot be declared using a typedef %0 of the class name">;
+def err_destructor_name : Error<
+  "expected the class name after '~' to name the enclosing class">;
 
 // C++ initialization
 def err_lvalue_to_rvalue_ref : Error<"rvalue reference cannot bind to lvalue">;
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 36cb656966f5..989e08ee9dac 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -2456,6 +2456,16 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl,
       CheckConstructor(Constructor);
     } else if (isa<CXXDestructorDecl>(NewFD)) {
       CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent());
+      QualType ClassType = Context.getTypeDeclType(Record);
+      if (!ClassType->isDependentType()) {
+        ClassType = Context.getCanonicalType(ClassType);
+        DeclarationName Name 
+          = Context.DeclarationNames.getCXXDestructorName(ClassType);
+        if (NewFD->getDeclName() != Name) {
+          Diag(NewFD->getLocation(), diag::err_destructor_name);
+          return NewFD->setInvalidDecl();  
+        }
+      }
       Record->setUserDeclaredDestructor(true);
       // C++ [class]p4: A POD-struct is an aggregate class that has [...] no
       // user-defined destructor.
diff --git a/clang/test/SemaCXX/destructor.cpp b/clang/test/SemaCXX/destructor.cpp
index e65a09713278..790a401ae99c 100644
--- a/clang/test/SemaCXX/destructor.cpp
+++ b/clang/test/SemaCXX/destructor.cpp
@@ -55,3 +55,9 @@ G::~G() { }
 struct H {
   ~H(void) { } 
 };
+
+struct X {};
+
+struct Y {
+  ~X(); // expected-error {{expected the class name after '~' to name the enclosing class}}
+};