Fixed #9591 (SymbolDatabase: decltype)

lib/symboldatabase.cpp

@@ -3417,6 +3417,10 @@ void Function::addArguments(const SymbolDatabase *symbolDatabase, const Scope *s
         const Token* nameTok  = nullptr;
 
         do {
+            if (Token::simpleMatch(tok, "decltype (")) {
+                tok = tok->linkAt(1)->next();
+                continue;
+            }
             if (tok != startTok && !nameTok && Token::Match(tok, "( & %var% ) [")) {
                 nameTok = tok->tokAt(2);
                 endTok = nameTok->previous();

test/testsymboldatabase.cpp

@@ -219,6 +219,7 @@ private:
         TEST_CASE(functionArgs13); // #7697
         TEST_CASE(functionArgs14); // #9055
         TEST_CASE(functionArgs15); // #7159
+        TEST_CASE(functionArgs16); // #9591
 
         TEST_CASE(functionImplicitlyVirtual);
 
@@ -2309,6 +2310,21 @@ private:
         ASSERT_EQUALS(0, method.minArgCount());
     }
 
+    void functionArgs16() { // #9591
+        const char code[] =
+            "struct A { int var; };\n"
+            "void foo(int x, decltype(A::var) *&p) {}";
+        GET_SYMBOL_DB(code);
+        ASSERT(db);
+        const Scope *scope = db->functionScopes.front();
+        const Function *func = scope->function;
+        ASSERT_EQUALS(2, func->argCount());
+        const Variable *arg2 = func->getArgumentVar(1);
+        ASSERT_EQUALS("p", arg2->name());
+        ASSERT(arg2->isPointer());
+        ASSERT(arg2->isReference());
+    }
+
     void functionImplicitlyVirtual() {
         GET_SYMBOL_DB("class base { virtual void f(); };\n"
                       "class derived : base { void f(); };\n"