Class checking : Check that base class destructors are virtual. Experimental

CheckClass.cpp

@@ -598,6 +598,7 @@ void CheckClass::CheckMemset()
         }
     }
 }
+//---------------------------------------------------------------------------
 
 
 
@@ -616,5 +617,53 @@ void CheckClass::CheckOperatorEq1()
         _errorLogger->reportErr(ostr.str());
     }
 }
+//---------------------------------------------------------------------------
 
 
+
+
+//---------------------------------------------------------------------------
+// A destructor in a base class should be virtual
+//---------------------------------------------------------------------------
+
+void CheckClass::virtualDestructor()
+{
+    const TOKEN *derived = TOKEN::findmatch(_tokenizer->tokens(), "class %var% : public %var%");
+    while (derived)
+    {
+        // Name of base class..
+        const char *baseName[2];
+        baseName[0] = derived->strAt( 4 );
+        baseName[1] = 0;
+
+        // Find the destructor for the base class.
+        const TOKEN *base = TOKEN::findmatch(_tokenizer->tokens(), "%any% ~ %var1% (", baseName);
+        while (base && TOKEN::Match(base, "::"))
+            base = TOKEN::findmatch(base->next, "%any% ~ %var1% (", baseName);
+
+        // Check that there is a destructor..
+        if ( ! base )
+        {
+            // Is the class declaration available?
+            base = TOKEN::findmatch(_tokenizer->tokens(), "class %var1% :|{", baseName);
+            if ( base )
+            {
+                std::ostringstream errmsg;
+                errmsg << _tokenizer->fileLine(base) << ": Base class " << baseName[0] << " doesn't have a virtual destructor";
+                _errorLogger->reportErr(errmsg.str());
+            }
+        }
+
+        // There is a destructor. Check that it's virtual..
+        else if ( ! TOKEN::Match(base, "virtual") )
+        {
+            std::ostringstream errmsg;
+            errmsg << _tokenizer->fileLine(base) << ": The destructor for the base class " << baseName[0] << " is not virtual";
+            _errorLogger->reportErr(errmsg.str());
+        }
+
+        derived = TOKEN::findmatch(derived->next, "class %var% : public %var%");
+    }
+}
+//---------------------------------------------------------------------------
+

CheckClass.h

@@ -39,6 +39,9 @@ public:
 
     void CheckOperatorEq1();    // Warning upon "void operator=(.."
 
+    // The destructor in a base class should be virtual
+    void virtualDestructor();
+
 private:
     struct VAR
     {

cppcheck.cpp

@@ -261,6 +261,9 @@ void CppCheck::checkFile(const std::string &code, const char FileName[])
     // Check that all class constructors are ok.
     checkClass.CheckConstructors();
 
+    // Check that all base classes have virtual destructors
+    checkClass.virtualDestructor();
+
     if (_settings._showAll)
     {
         // Check for "if (a=b)"