cppcheck/test/testincompletestatement.cpp

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2016 Cppcheck team.
 *
 * 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 "testsuite.h"
#include "tokenize.h"
#include "checkother.h"


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

private:
    Settings settings;

    void check(const char code[]) {
        // Clear the error buffer..
        errout.str("");

        // Tokenize..
        Tokenizer tokenizer(&settings, this);
        std::istringstream istr(code);
        tokenizer.tokenize(istr, "test.cpp");
        tokenizer.simplifyTokenList2();

        // Check for incomplete statements..
        CheckOther checkOther(&tokenizer, &settings, this);
        checkOther.checkIncompleteStatement();
    }

    void run() {
        settings.addEnabled("warning");

        TEST_CASE(test1);
        TEST_CASE(test2);
        TEST_CASE(test3);
        TEST_CASE(test4);
        TEST_CASE(test5);
        TEST_CASE(test6);
        TEST_CASE(test_numeric);
        TEST_CASE(void0); // #6327: No fp for statement "(void)0;"
        TEST_CASE(intarray);
        TEST_CASE(structarraynull);
        TEST_CASE(structarray);
        TEST_CASE(conditionalcall);     // ; 0==x ? X() : Y();
        TEST_CASE(structinit);          // #2462 : ABC abc{1,2,3};
        TEST_CASE(returnstruct);
        TEST_CASE(cast);                // #3009 : (struct Foo *)123.a = 1;
        TEST_CASE(increment);           // #3251 : FP for increment
        TEST_CASE(cpp11init);           // #5493 : int i{1};
        TEST_CASE(block);               // ({ do_something(); 0; })
    }

    void test1() {
        check("void foo()\n"
              "{\n"
              "    const char def[] =\n"
              "    \"abc\";\n"
              "}");

        ASSERT_EQUALS("", errout.str());
    }

    void test2() {
        check("void foo()\n"
              "{\n"
              "    \"abc\";\n"
              "}");

        ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant code: Found a statement that begins with string constant.\n", errout.str());
    }

    void test3() {
        check("void foo()\n"
              "{\n"
              "    const char *str[] = { \"abc\" };\n"
              "}");

        ASSERT_EQUALS("", errout.str());
    }

    void test4() {
        check("void foo()\n"
              "{\n"
              "const char *a =\n"
              "{\n"
              "\"hello \"\n"
              "\"more \"\n"
              "\"world\"\n"
              "};\n"
              "}");

        ASSERT_EQUALS("", errout.str());
    }

    void test5() {
        check("void foo()\n"
              "{\n"
              "    50;\n"
              "}");

        ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant code: Found a statement that begins with numeric constant.\n", errout.str());
    }

    void test6() {
        // don't crash
        check("void f() {\n"
              "  1 == (two + three);\n"
              "  2 != (two + three);\n"
              "  (one + two) != (two + three);\n"
              "}");
    }

    void test_numeric() {
        check("struct P\n"
              "{\n"
              "double a;\n"
              "double b;\n"
              "};\n"
              "void f()\n"
              "{\n"
              "const P values[2] =\n"
              "{\n"
              "{ 346.1,114.1 }, { 347.1,111.1 }\n"
              "};\n"
              "}");

        ASSERT_EQUALS("", errout.str());
    }

    void void0() { // #6327
        check("void f() { (void*)0; }");
        ASSERT_EQUALS("", errout.str());

        check("void f() { $0; }");
        ASSERT_EQUALS("", errout.str());
    }

    void intarray() {
        check("int arr[] = { 100/2, 1*100 };");
        ASSERT_EQUALS("", errout.str());
    }

    void structarraynull() {
        check("struct st arr[] = {\n"
              "    { 100/2, 1*100 }\n"
              "    { 90, 70 }\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void structarray() {
        check("struct st arr[] = {\n"
              "    { 100/2, 1*100 }\n"
              "    { 90, 70 }\n"
              "};");
        ASSERT_EQUALS("", errout.str());
    }

    void conditionalcall() {
        check("void f() {\n"
              "    0==x ? X() : Y();\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void structinit() {
        // #2462 - C++11 struct initialization
        check("void f() {\n"
              "    ABC abc{1,2,3};\n"
              "}");
        ASSERT_EQUALS("", errout.str());

        // #6260 - C++11 array initialization
        check("void foo() {\n"
              "    static const char* a[][2] {\n"
              "        {\"b\", \"\"},\n"
              "    };\n"
              "}");
        ASSERT_EQUALS("", errout.str());

        // #2482 - false positive for empty struct
        check("struct A {};");
        ASSERT_EQUALS("", errout.str());

        // #4387 - C++11 initializer list
        check("A::A() : abc{0} {}");
        ASSERT_EQUALS("", errout.str());

        // #5042 - C++11 initializer list
        check("A::A() : abc::def<int>{0} {}");
        ASSERT_EQUALS("", errout.str());

        // #4503 - vector init
        check("void f() { vector<int> v{1}; }");
        ASSERT_EQUALS("", errout.str());
    }

    void returnstruct() {
        check("struct s foo() {\n"
              "    return (struct s){0,0};\n"
              "}");
        ASSERT_EQUALS("", errout.str());

        // #4754
        check("unordered_map<string, string>  foo() {\n"
              "    return {\n"
              "        {\"hi\", \"there\"},\n"
              "        {\"happy\", \"sad\"}\n"
              "    };\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void cast() {
        check("void f() {\n"
              "    ((struct foo *)(0x1234))->xy = 1;\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void increment() {
        check("void f() {\n"
              "    int x = 1;\n"
              "    x++, x++;\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void cpp11init() {
        check("void f() {\n"
              "    int x{1};\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }

    void block() {
        check("void f() {\n"
              "    ({ do_something(); 0; });\n"
              "}");
        ASSERT_EQUALS("", errout.str());

        check("void f() {\n"
              "out:\n"
              "    ({ do_something(); 0; });\n"
              "}");
        ASSERT_EQUALS("", errout.str());
    }
};

REGISTER_TEST(TestIncompleteStatement)