Symbol database: added simple mismatch check in Scope::findFunction when passing address to function that expects a reference

lib/symboldatabase.cpp

@@ -2506,6 +2506,17 @@ const Function* Scope::findFunction(const Token *tok) const
                 const Token *arg = tok->tokAt(2);
                 while (arg && arg->str() != ")") {
                     /** @todo check argument type for match */
+
+                    // mismatch parameter: passing parameter by address to function, argument is reference
+                    if (arg->str() == "&") {
+                        // check that function argument type is not mismatching
+                        const Variable *funcarg = func->getArgumentVar(args);
+                        if (funcarg && funcarg->isReference()) {
+                            args = ~0U;
+                            break;
+                        }
+                    }
+
                     args++;
                     arg = arg->nextArgument();
                 }

test/testsymboldatabase.cpp

@@ -212,6 +212,7 @@ private:
         TEST_CASE(garbage);
 
         TEST_CASE(findFunction1);
+        TEST_CASE(findFunction2); // mismatch: parameter passed by address => reference argument
     }
 
     void array() const {
@@ -1857,6 +1858,20 @@ private:
             }
         }
     }
+
+    void findFunction2() {
+        // The function does not match the function call.
+        GET_SYMBOL_DB("void func(const int x, const Fred &fred);\n"
+                      "void otherfunc() {\n"
+                      "    float t;\n"
+                      "    func(x, &t);\n"
+                      "}");
+        const Token *callfunc = Token::findmatch(tokenizer.tokens(), "func ( x , & t ) ;");
+        ASSERT_EQUALS("", errout.str());
+        ASSERT_EQUALS(true,  db != nullptr); // not null
+        ASSERT_EQUALS(true,  callfunc != nullptr); // not null
+        ASSERT_EQUALS(false, (callfunc && callfunc->function())); // callfunc->function() should be null
+    }
 };
 
 REGISTER_TEST(TestSymbolDatabase)