testconstructors.cpp

cppcheck is a static C/C++ code analyzer that checks for memory leaks, mismatching allocation-deallo

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam,
 * Leandro Penz, Kimmo Varis, Vesa Pikki
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/
 */



#include "../src/tokenize.h"
#include "../src/checkclass.h"
#include "testsuite.h"
#include <sstream>

extern std::ostringstream errout;

class TestConstructors : public TestFixture
{
public:
    TestConstructors() : TestFixture("TestConstructors")
    { }

private:


    void check(const char code[])
    {
        // Tokenize..
        Tokenizer tokenizer;
        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp");
        tokenizer.simplifyTokenList();

        // Clear the error buffer..
        errout.str("");

        // Check class constructors..
        Settings settings;
        settings._checkCodingStyle = true;
        CheckClass checkClass(&tokenizer, settings, this);
        checkClass.constructors();
    }

    void run()
    {
        TEST_CASE(simple1);
        TEST_CASE(simple2);
        TEST_CASE(simple3);
        TEST_CASE(simple4);

        TEST_CASE(initvar_with_this);       // BUG 2190300
        TEST_CASE(initvar_if);              // BUG 2190290
        TEST_CASE(initvar_operator_eq1);     // BUG 2190376
        TEST_CASE(initvar_operator_eq2);     // BUG 2190376
        TEST_CASE(initvar_operator_eq3);
        TEST_CASE(initvar_same_classname);      // BUG 2208157
        TEST_CASE(initvar_chained_assign);      // BUG 2270433
        TEST_CASE(initvar_2constructors);       // BUG 2270353

        TEST_CASE(initvar_private_constructor);     // BUG 2354171 - private constructor

        TEST_CASE(initvar_destructor);      // No variables need to be initialized in a destructor
    }


    void simple1()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    int i;\n"
              "};\n");
        std::string actual(errout.str());
        std::string expected("[test.cpp:1]: (style) The class 'Fred' has no constructor\n");
        ASSERT_EQUALS(expected, actual);
    }


    void simple2()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred() { }\n"
              "    int i;\n"
              "};\n");
        ASSERT_EQUALS(std::string("[test.cpp:4]: (style) Member variable not initialized in the constructor 'Fred::i'\n"), errout.str());
    }


    void simple3()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred();\n"
              "    int i;\n"
              "};\n"
              "Fred::Fred()\n"
              "{ }\n");
        ASSERT_EQUALS(std::string("[test.cpp:7]: (style) Member variable not initialized in the constructor 'Fred::i'\n"), errout.str());
    }


    void simple4()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred();\n"
              "    Fred(int _i);\n"
              "    int i;\n"
              "};\n"
              "Fred::Fred()\n"
              "{ }\n"
              "Fred::Fred(int _i)\n"
              "{\n"
              "    i = _i;\n"
              "}\n");
        ASSERT_EQUALS(std::string("[test.cpp:8]: (style) Member variable not initialized in the constructor 'Fred::i'\n"), errout.str());
    }


    void initvar_with_this()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred()\n"
              "    { this->i = 0; }\n"
              "    int i;\n"
              "};\n");
        ASSERT_EQUALS(std::string(""), errout.str());
    }

    void initvar_if()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred()\n"
              "    {\n"
              "        if (true)\n"
              "            i = 0;\n"
              "        else\n"
              "            i = 1;\n"
              "    }\n"
              "    int i;\n"
              "};\n");
        ASSERT_EQUALS(std::string(""), errout.str());
    }

    void initvar_operator_eq1()
    {
        // Bug 2190376 - False positive, Uninitialized member variable with operator=

        check("class Fred\n"
              "{\n"
              "private:\n"
              "    int i;\n"
              "\n"
              "public:\n"
              "    Fred()\n"
              "    { i = 0; }\n"
              "\n"
              "    Fred(const Fred &fred)\n"
              "    { *this = fred; }\n"
              "\n"
              "    const Fred & operator=(const Fred &fred)\n"
              "    { i = fred.i; return *this; }\n"
              "};\n");

        std::string err(errout.str());
        ASSERT_EQUALS(std::string(""), err);
    }


    void initvar_operator_eq2()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred() { i = 0; }\n"
              "    void operator=() { }\n"
              "    int i;\n"
              "};\n");
        ASSERT_EQUALS(std::string("[test.cpp:5]: (style) Member variable not initialized in the constructor 'Fred::i'\n"), errout.str());
    }

    void initvar_operator_eq3()
    {
        check("class Fred\n"
              "{\n"
              "public:\n"
              "    Fred() { Init(); }\n"
              "    void operator=() { Init(); }\n"
              "private:\n"
              "    Init() { i = 0; }\n"
              "    int i;\n"
              "};\n");
        ASSERT_EQUALS(std::string(""), errout.str());
    }

    void initvar_same_classname()
    {
        // Bug 2208157 - False positive: Uninitialized variable, same class name

        check("void func1()\n"
              "{\n"
              "    class Fred\n"
              "    {\n"
              "        int a;\n"
              "        Fred() { a = 0; }\n"
              "    };\n"
              "}\n"
              "\n"
              "void func2()\n"
              "{\n"
              "    class Fred\n"
              "    {\n"
              "        int b;\n"
              "        Fred() { b = 0; }\n"
              "    };\n"
              "}\n");

        std::string err(errout.str());
        ASSERT_EQUALS(std::string(""), err);
    }

    void initvar_chained_assign()
    {
        // Bug 2270433 - Uninitialized variable false positive on chained assigns

        check("class c\n"
              "{\n"
              "    c();\n"
              "\n"
              "    int m_iMyInt1;\n"
              "    int m_iMyInt2;\n"
              "}\n"
              "\n"
              "c::c()\n"
              "{\n"
              "    m_iMyInt1 = m_iMyInt2 = 0;\n"
              "}\n");

        std::string err(errout.str());
        ASSERT_EQUALS(std::string(""), err);
    }


    void initvar_2constructors()
    {
        check("class c\n"
              "{\n"
              "    c();\n"
              "    c(bool b);"
              "\n"
              "    void InitInt();\n"
              "\n"
              "    int m_iMyInt;\n"
              "    int m_bMyBool;\n"
              "}\n"
              "\n"
              "c::c()\n"
              "{\n"
              "    m_bMyBool = false;\n"
              "    InitInt();"
              "}\n"
              "\n"
              "c::c(bool b)\n"
              "{\n"
              "    m_bMyBool = b;\n"
              "    InitInt();\n"
              "}\n"
              "\n"
              "void c::InitInt()\n"
              "{\n"
              "    m_iMyInt = 0;\n"
              "}\n");

        std::string err(errout.str());
        ASSERT_EQUALS(std::string(""), err);
    }


    void initvar_private_constructor()
    {
        check("class Fred\n"
              "{\n"
              "private:\n"
              "    int var;\n"
              "    Fred();\n"
              "};\n"
              "Fred::Fred()\n"
              "{ }");
        ASSERT_EQUALS(std::string(""), errout.str());
    }

    void initvar_destructor()
    {
        check("class Fred\n"
              "{\n"
              "private:\n"
              "    int var;\n"
              "public:\n"
              "    Fred() : var(0) {}\n"
              "    ~Fred() {}\n"
              "};\n");
        ASSERT_EQUALS(std::string(""), errout.str());
    }
};

REGISTER_TEST(TestConstructors)