Uninitialized member variables: Improvements

lib/checkuninitvar.cpp

@@ -1082,7 +1082,7 @@ void CheckUninitVar::checkScope(const Scope* scope)
             tok = tok->next();
         if (stdtype || i->isPointer())
             checkScopeForVariable(scope, tok, *i, NULL, NULL, NULL);
-        if (_settings->experimental && Token::Match(i->typeStartToken(), "struct %type% %var% ;")) {
+        if (_settings->experimental && _settings->isEnabled("style") && Token::Match(i->typeStartToken(), "struct %type% %var% ;")) {
             const std::string structname(i->typeStartToken()->next()->str());
             const SymbolDatabase * symbolDatabase = _tokenizer->getSymbolDatabase();
             for (std::size_t j = 0U; j < symbolDatabase->classAndStructScopes.size(); ++j) {
@@ -1343,12 +1343,14 @@ bool CheckUninitVar::checkScopeForVariable(const Scope* scope, const Token *tok,
         // variable is seen..
         if (tok->varId() == var.varId()) {
             if (membervar) {
-                if (Token::Match(tok, "%var% . %var% =") && tok->strAt(2) == membervar->name())
+                if (Token::Match(tok, "%var% . %var% [=.[]") && tok->strAt(2) == membervar->name())
                     return true;
-                else if (Token::Match(tok, "%var% ="))
+                else if (tok->strAt(1) == "=")
+                    return true;
+                else if (tok->strAt(-1) == "&")
                     return true;
                 else if (Token::Match(tok->previous(), "[(,] %var% [,)]") && isVariableUsage(scope, tok, var.isPointer()))
-                    uninitvarError(tok, tok->str() + "." + membervar->name());
+                    uninitStructMemberError(tok, tok->str() + "." + membervar->name());
             } else {
                 // Use variable
                 if (!suppressErrors && isVariableUsage(scope, tok, var.isPointer()))
@@ -1512,3 +1514,14 @@ void CheckUninitVar::uninitvarError(const Token *tok, const std::string &varname
 {
     reportError(tok, Severity::error, "uninitvar", "Uninitialized variable: " + varname);
 }
+
+void CheckUninitVar::uninitStructMemberError(const Token *tok, const std::string &membername)
+{
+    reportError(tok,
+                Severity::warning,
+                "uninitStructMember",
+                "Perhaps '" + membername + "' should be initialized before calling function.\n"
+                "The struct is not fully initialized, '" + membername + "' hasn't been initialized. "
+                "Using the struct in function call might be dangerous, unless you know for sure that the member "
+                "will not be used by the function.");
+}

lib/checkuninitvar.h

@@ -85,6 +85,7 @@ public:
     void uninitstringError(const Token *tok, const std::string &varname, bool strncpy_);
     void uninitdataError(const Token *tok, const std::string &varname);
     void uninitvarError(const Token *tok, const std::string &varname);
+    void uninitStructMemberError(const Token *tok, const std::string &membername);
 
 private:
     void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
@@ -94,6 +95,7 @@ private:
         c.uninitstringError(0, "varname", true);
         c.uninitdataError(0, "varname");
         c.uninitvarError(0, "varname");
+        c.uninitStructMemberError(0, "a.b");
     }
 
     static std::string myName() {

test/testuninitvar.cpp

@@ -1944,6 +1944,7 @@ private:
 
         Settings settings;
         settings.experimental = experimental;
+        settings.addEnabled("style");
 
         // Tokenize..
         Tokenizer tokenizer(&settings, this);
@@ -2561,7 +2562,7 @@ private:
                         "    ab.a = 0;\n"
                         "    do_something(ab);\n"
                         "}\n", "test.c", true);
-        ASSERT_EQUALS("[test.c:6]: (error) Uninitialized variable: ab.b\n", errout.str());
+        ASSERT_EQUALS("[test.c:6]: (warning) Perhaps 'ab.b' should be initialized before calling function.\n", errout.str());
 
         checkUninitVar2("struct AB { int a; int b; };\n"
                         "void do_something(const struct AB ab);\n"
@@ -2581,6 +2582,30 @@ private:
                         "    do_something(ab);\n"
                         "}\n", "test.c", true);
         ASSERT_EQUALS("", errout.str());
+
+        checkUninitVar2("struct AB { int a; struct { int b; int c; } s; };\n"
+                        "void do_something(const struct AB ab);\n"
+                        "void f(void) {\n"
+                        "    struct AB ab;\n"
+                        "    ab.a = 1;\n"
+                        "    ab.s.b = 2;\n"
+                        "    ab.s.c = 3;\n"
+                        "    do_something(ab);\n"
+                        "}\n", "test.c", true);
+        ASSERT_EQUALS("", errout.str());
+
+        checkUninitVar2("struct conf {\n"
+                        "    char x;\n"
+                        "};\n"
+                        "\n"
+                        "void do_something(struct conf ant_conf);\n"
+                        "\n"
+                        "void f(void) {\n"
+                        "   struct conf c;\n"
+                        "   initdata(&c);\n"
+                        "   do_something(c);\n"
+                        "}\n", "test.c", true);
+        ASSERT_EQUALS("", errout.str());
     }
 };