Fix #12762 FN constVariableReference with multiplication (#6432)

Author: chrchr-github

lib/astutils.cpp

@@ -2297,7 +2297,7 @@ static T* getTokenArgumentFunctionImpl(T* tok, int& argn)
             parent = parent->astParent();
 
         // passing variable to subfunction?
-        if (Token::Match(parent, "[*[(,{.]") || Token::Match(parent, "%oror%|&&"))
+        if (Token::Match(parent, "[[(,{.]") || Token::Match(parent, "%oror%|&&") || (parent && parent->isUnaryOp("*")))
             ;
         else if (Token::simpleMatch(parent, ":")) {
             while (Token::Match(parent, "[?:]"))
@@ -2578,7 +2578,7 @@ bool isVariableChanged(const Token *tok, int indirect, const Settings &settings,
 
     const Token *tok2 = tok;
     int derefs = 0;
-    while (Token::simpleMatch(tok2->astParent(), "*") ||
+    while ((tok2->astParent() && tok2->astParent()->isUnaryOp("*")) ||
            (Token::simpleMatch(tok2->astParent(), ".") && !Token::simpleMatch(tok2->astParent()->astParent(), "(")) ||
            (tok2->astParent() && tok2->astParent()->isUnaryOp("&") && Token::simpleMatch(tok2->astParent()->astParent(), ".") && tok2->astParent()->astParent()->originalName()=="->") ||
            (Token::simpleMatch(tok2->astParent(), "[") && tok2 == tok2->astParent()->astOperand1())) {

test/testother.cpp

@@ -3613,6 +3613,16 @@ class TestOther : public TestFixture {
               "    });\n"
               "}\n");
         ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 's' can be declared as reference to const\n", errout_str());
+
+        check("struct S {\n" // #12762
+              "    std::vector<int> m;\n"
+              "    void f();\n"
+              "};\n"
+              "void S::f() {\n"
+              "    std::vector<int>& r = m;\n"
+              "    g(r[0] * 2);\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'r' can be declared as reference to const\n", errout_str());
     }
 
     void constParameterCallback() {