Partial fix for #11927 FP knownArgument with unknown function type (#5413)

Author: chrchr-github

lib/checkother.cpp

@@ -3804,8 +3804,14 @@ void CheckOther::knownArgumentError(const Token *tok, const Token *ftok, const V
     const std::string &expr = tok->expressionString();
     const std::string &fun = ftok->str();
 
+    std::string ftype = "function ";
+    if (ftok->type())
+        ftype = "constructor ";
+    else if (fun == "{")
+        ftype = "init list ";
+
     const char *id;
-    std::string errmsg = "Argument '" + expr + "' to function " + fun + " is always " + std::to_string(intvalue) + ". ";
+    std::string errmsg = "Argument '" + expr + "' to " + ftype + fun + " is always " + std::to_string(intvalue) + ". ";
     if (!isVariableExpressionHidden) {
         id = "knownArgument";
         errmsg += "It does not matter what value '" + varexpr + "' has.";

lib/valueflow.cpp

@@ -635,7 +635,7 @@ static void setTokenValue(Token* tok,
         // Ensure that the comma isn't a function call
         if (!callParent || (!Token::Match(callParent->previous(), "%name%|> (") && !Token::simpleMatch(callParent, "{") &&
                             (!Token::Match(callParent, "( %name%") || settings->library.isNotLibraryFunction(callParent->next())) &&
-                            !(callParent->str() == "(" && Token::simpleMatch(callParent->astOperand1(), "*")))) {
+                            !(callParent->str() == "(" && (Token::simpleMatch(callParent->astOperand1(), "*") || Token::Match(callParent->astOperand1(), "%name%"))))) {
             setTokenValue(parent, std::move(value), settings);
             return;
         }

test/testother.cpp

@@ -11067,6 +11067,21 @@ class TestOther : public TestFixture {
               "    }\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // #11927
+        check("void f(func_t func, int i) {\n"
+              "    (func)(i, 0);\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
+        check("struct S { int i; };\n"
+              "void f(int i) {\n"
+              "    const int a[] = { i - 1 * i, 0 };\n"
+              "    auto s = S{ i - 1 * i };\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3]: (style) Argument 'i-1*i' to init list { is always 0. It does not matter what value 'i' has.\n"
+                      "[test.cpp:4]: (style) Argument 'i-1*i' to constructor S is always 0. It does not matter what value 'i' has.\n",
+                      errout.str());
     }
 
     void knownArgumentHiddenVariableExpression() {