testpreprocessor.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/
 */


// The preprocessor that c++check uses is a bit special. Instead of generating
// the code for a known configuration, it generates the code for each configuration.


#include "testsuite.h"
#include "../src/preprocessor.h"
#include "../src/tokenize.h"
#include <map>
#include <string>

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

    class OurPreprocessor : public Preprocessor
    {
    public:
        static std::string replaceIfDefined(const std::string &str)
        {
            return Preprocessor::replaceIfDefined(str);
        }

        static std::string expandMacros(std::string code)
        {
            return Preprocessor::expandMacros(code);
        }
    };

private:

    void run()
    {
        // Just read the code into a string. Perform simple cleanup of the code
        TEST_CASE(readCode);

        // The bug that started the whole work with the new preprocessor
        TEST_CASE(Bug2190219);

        TEST_CASE(test1);
        TEST_CASE(test2);
        TEST_CASE(test3);
        TEST_CASE(test4);
        TEST_CASE(test5);
        TEST_CASE(test6);

        // Handling include guards (don't create extra configuration for it)
        TEST_CASE(includeguard);

        TEST_CASE(newlines);

        TEST_CASE(comments1);

        TEST_CASE(if0);
        TEST_CASE(if1);

        TEST_CASE(elif);

        TEST_CASE(if_cond1);

        TEST_CASE(multiline1);
        TEST_CASE(multiline2);
        TEST_CASE(multiline3);

        TEST_CASE(if_defined);      // "#if defined(AAA)" => "#ifdef AAA"

        // Macros..
        TEST_CASE(macro_simple1);
        TEST_CASE(macro_simple2);
        TEST_CASE(macro_simple3);
        TEST_CASE(macro_simple4);
        TEST_CASE(macro_simple5);
        TEST_CASE(macro_simple6);
        TEST_CASE(macro_simple7);
        TEST_CASE(macro_simple8);
        TEST_CASE(macro_mismatch);
        TEST_CASE(string1);
        TEST_CASE(string2);
        TEST_CASE(preprocessor_undef);
        TEST_CASE(defdef);  // Defined multiple times
        TEST_CASE(preprocessor_doublesharp);
        TEST_CASE(preprocessor_include_in_str);
        TEST_CASE(fmt1);
        TEST_CASE(fmt2);
        TEST_CASE(multi_character_character);

        TEST_CASE(stringify);
        TEST_CASE(ifdefwithfile);
    }


    void readCode()
    {
        const char code[] = " \t a //\n"
                            "  #aa\t /* remove this */\tb  \r\n";
        Preprocessor p;
        std::istringstream istr(code);
        std::string codestr(p.read(istr));
        ASSERT_EQUALS("a \n#aa b \n", codestr);
    }


    void Bug2190219()
    {
        const char filedata[] = "int main()\n"
                                "{\n"
                                "#ifdef __cplusplus\n"
                                "    int* flags = new int[10];\n"
                                "#else\n"
                                "    int* flags = (int*)malloc((10)*sizeof(int));\n"
                                "#endif\n"
                                "\n"
                                "#ifdef __cplusplus\n"
                                "    delete [] flags;\n"
                                "#else\n"
                                "    free(flags);\n"
                                "#endif\n"
                                "}\n";

        // Expected result..
        std::map<std::string, std::string> expected;
        expected[""]          = "int main()\n"
                                "{\n"
                                "\n"
                                "\n"
                                "\n"
                                "int* flags = (int*)malloc((10)*sizeof(int));\n"
                                "\n"
                                "\n"
                                "\n"
                                "\n"
                                "\n"
                                "free(flags);\n"
                                "\n"
                                "}\n";

        expected["__cplusplus"] = "int main()\n"
                                  "{\n"
                                  "\n"
                                  "int* flags = new int[10];\n"
                                  "\n"
                                  "\n"
                                  "\n"
                                  "\n"
                                  "\n"
                                  "delete [] flags;\n"
                                  "\n"
                                  "\n"
                                  "\n"
                                  "}\n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS(expected[""], actual[""]);
        ASSERT_EQUALS(expected["__cplusplus"], actual["__cplusplus"]);
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
    }


    void test1()
    {
        const char filedata[] = "#ifdef  WIN32 \n"
                                "    abcdef\n"
                                "#else  \n"
                                "    qwerty\n"
                                "#endif  \n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS("\n\n\nqwerty\n\n", actual[""]);
        ASSERT_EQUALS("\nabcdef\n\n\n\n", actual["WIN32"]);
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
    }

    void test2()
    {
        const char filedata[] = "# ifndef WIN32\n"
                                "    \" # ifdef WIN32\" // a comment\n"
                                "   #   else  \n"
                                "    qwerty\n"
                                "  # endif  \n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS("\n\" # ifdef WIN32\"\n\n\n\n", actual[""]);
        ASSERT_EQUALS("\n\n\nqwerty\n\n", actual["WIN32"]);
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
    }

    void test3()
    {
        const char filedata[] = "#ifdef ABC\n"
                                "a\n"
                                "#ifdef DEF\n"
                                "b\n"
                                "#endif\n"
                                "c\n"
                                "#endif\n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS("\n\n\n\n\n\n\n", actual[""]);
        ASSERT_EQUALS("\na\n\n\n\nc\n\n", actual["ABC"]);
        ASSERT_EQUALS("\na\n\nb\n\nc\n\n", actual["ABC;DEF"]);
        ASSERT_EQUALS(3, static_cast<unsigned int>(actual.size()));
    }

    void test4()
    {
        const char filedata[] = "#ifdef ABC\n"
                                "A\n"
                                "#endif\t\n"
                                "#ifdef ABC\n"
                                "A\n"
                                "#endif\n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS("\n\n\n\n\n\n", actual[""]);
        ASSERT_EQUALS("\nA\n\n\nA\n\n", actual["ABC"]);
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
    }

    void test5()
    {
        const char filedata[] = "#ifdef ABC\n"
                                "A\n"
                                "#else\n"
                                "B\n"
                                "#ifdef DEF\n"
                                "C\n"
                                "#endif\n"
                                "#endif\n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Compare results..
        ASSERT_EQUALS("\n\n\nB\n\n\n\n\n", actual[""]);
        ASSERT_EQUALS("\nA\n\n\n\n\n\n\n", actual["ABC"]);
        ASSERT_EQUALS("\n\n\nB\n\nC\n\n\n", actual["DEF"]);
        ASSERT_EQUALS(3, static_cast<unsigned int>(actual.size()));
    }

    void test6()
    {
        const char filedata[] = "#if(AAA)\n"
                                "#if(AAA)\n";

        std::istringstream istr(filedata);
        const std::string actual(Preprocessor::read(istr));

        // Compare results..
        ASSERT_EQUALS("#if (AAA)\n#if (AAA)\n", actual);
    }


    void includeguard()
    {
        // Handling include guards..
        const char filedata[] = "#file \"abc.h\"\n"
                                "#ifndef abcH\n"
                                "#define abcH\n"
                                "#endif\n"
                                "#endfile\n"
                                "#ifdef ABC\n"
                                "#endif";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        // Expected configurations: "" and "ABC"
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
    }

    void ifdefwithfile()
    {
        // Handling include guards..
        const char filedata[] = "#ifdef ABC\n"
                                "#file \"abc.h\"\n"
                                "class A{};/*\n\n\n\n\n\n\n*/\n"
                                "#endfile\n"
                                "#endif\n"
                                "int main() {}\n";

        // Preprocess => actual result..
        std::istringstream istr(filedata);
        std::map<std::string, std::string> actual;
        Preprocessor preprocessor;
        preprocessor.preprocess(istr, actual, "file.c");

        Tokenizer tok;
        std::istringstream codeStream(actual[""]);
        tok.tokenize(codeStream, "main.cpp");

        ASSERT_EQUALS("\n\n##file 0\n1:\n2:\n3:\n4: int main ( ) { }\n", tok.tokens()->stringifyList());

        // Expected configurations: "" and "ABC"
        ASSERT_EQUALS(2, static_cast<unsigned int>(actual.size()));
        ASSERT_EQUALS("\n#file \"abc.h\"\n\n\n\n\n\n\n\n\n#endfile\n\nint main() {}\n", actual[""]);
        ASSERT_EQUALS("\n#file \"abc.h\"\nclass A{};\n\n\n\n\n\n\n\n#endfile\n\nint main() {}\n", actual["ABC"]);
    }

    void newlines()
    {
        const char filedata[] = "\r\r\n\n";

        // Preprocess
        std::istringstream istr(filedata);
        Preprocessor preprocessor;
        ASSERT_EQUALS("\n\n\n", preprocessor.read(istr));
    }



    void comments1()
    {
        const char filedata[] = "/*\n"