836 lines
26 KiB
C++
836 lines
26 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2009 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/
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*/
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#include "../src/tokenize.h"
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#include "../src/checkother.h"
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#include "testsuite.h"
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#include <sstream>
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extern std::ostringstream errout;
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class TestOther : public TestFixture
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{
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public:
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TestOther() : TestFixture("TestOther")
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{ }
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private:
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void run()
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{
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TEST_CASE(zeroDiv1);
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TEST_CASE(zeroDiv2);
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TEST_CASE(zeroDiv3);
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TEST_CASE(zeroDiv4);
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TEST_CASE(delete1);
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TEST_CASE(delete2);
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TEST_CASE(unreachable1);
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TEST_CASE(sprintf1); // Dangerous usage of sprintf
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TEST_CASE(sprintf2);
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TEST_CASE(sprintf3);
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TEST_CASE(sprintf4); // struct member
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TEST_CASE(strPlusChar1); // "/usr" + '/'
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TEST_CASE(strPlusChar2); // "/usr" + ch
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TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
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TEST_CASE(varScope1);
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TEST_CASE(varScope2);
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TEST_CASE(varScope3);
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TEST_CASE(varScope4);
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TEST_CASE(varScope5);
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TEST_CASE(nullpointer1);
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TEST_CASE(nullpointer2);
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TEST_CASE(nullpointer3); // dereferencing struct and then checking if it's null
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TEST_CASE(nullpointer4);
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TEST_CASE(oldStylePointerCast);
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TEST_CASE(postIncrementDecrementStl);
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TEST_CASE(postIncrementDecrementClass);
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}
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void check(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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// Simplify token list..
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tokenizer.simplifyTokenList();
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// Clear the error buffer..
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errout.str("");
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// Check for redundant code..
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Settings settings;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.warningRedundantCode();
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checkOther.checkZeroDivision();
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}
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void zeroDiv1()
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{
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check("void foo()\n"
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"{\n"
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" int a = 0;\n"
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" double b = 1.;\n"
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" cout<<b/a;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:5]: (error) Division by zero\n", errout.str());
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}
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void zeroDiv2()
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{
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check("void foo()\n"
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"{\n"
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" int sum = 0;\n"
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" int n = 100;\n"
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" for(int i = 0; i < n; i ++)\n"
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" {\n"
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" sum += i; \n"
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" }\n"
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" cout<<b/sum;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("void foo()\n"
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"{\n"
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" int a = 0 ? (2/0) : 0;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void zeroDiv3()
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{
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check("void f()\n"
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"{\n"
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" div_t divresult = div (1,0);\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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}
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void zeroDiv4()
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{
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check("void f()\n"
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"{\n"
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" long a = b / 0x6;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("void f()\n"
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"{\n"
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" long a = b / 0x0;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" long a = b / 0L;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" long a = b / 0ul;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" div_t divresult = div (1,0L);\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" div_t divresult = div (1,0x5);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("void f()\n"
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"{\n"
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" long a = b / 0.0;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" long a = b / 0.5;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("void f()\n"
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"{\n"
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" div_t divresult = div (1,0.0);\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
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check("void f()\n"
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"{\n"
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" div_t divresult = div (1,0.5);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void delete1()
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{
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check("void foo()\n"
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"{\n"
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" if (p)\n"
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" {\n"
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" delete p;\n"
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" p = 0;\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void delete2()
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{
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check("void foo()\n"
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"{\n"
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" if (p)\n"
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" {\n"
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" delete p;\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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check("void foo()\n"
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"{\n"
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" if (p)\n"
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" delete p;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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check("void foo()\n"
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"{\n"
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" if (p != NULL)\n"
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" delete p;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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check("void foo()\n"
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"{\n"
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" if (p)\n"
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" delete [] p;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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check("void foo()\n"
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"{\n"
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" if (0 != this->p)\n"
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" delete this->p;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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check("void Foo::deleteInstance()\n"
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"{\n"
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" if (Foo::instance != NULL)\n"
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" delete Foo::instance;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
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}
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void unreachable1()
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{
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check("void foo()\n"
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"{\n"
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" switch (p)\n"
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" {\n"
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" default:\n"
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" return 0;\n"
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" break;\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void sprintfUsage(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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tokenizer.setVarId();
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//tokenizer.tokens()->printOut( "tokens" );
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// Clear the error buffer..
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errout.str("");
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// Check for redundant code..
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Settings settings;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.invalidFunctionUsage();
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}
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void sprintf1()
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{
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sprintfUsage("void foo()\n"
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"{\n"
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" char buf[100];\n"
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" sprintf(buf,\"%s\",buf);\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:4]: (error) Overlapping data buffer buf\n", errout.str());
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}
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void sprintf2()
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{
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sprintfUsage("void foo()\n"
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"{\n"
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" char buf[100];\n"
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" sprintf(buf,\"%i\",sizeof(buf));\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void sprintf3()
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{
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sprintfUsage("void foo()\n"
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"{\n"
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" char buf[100];\n"
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" sprintf(buf,\"%i\",sizeof(buf));\n"
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" if (buf[0]);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void sprintf4()
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{
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sprintfUsage("struct A\n"
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"{\n"
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" char filename[128];\n"
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"};\n"
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"\n"
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"void foo()\n"
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"{\n"
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" const char* filename = \"hello\";\n"
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" struct A a;\n"
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" snprintf(a.filename, 128, \"%s\", filename);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void strPlusChar(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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tokenizer.setVarId();
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// Clear the error buffer..
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errout.str("");
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// Check for redundant code..
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Settings settings;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.strPlusChar();
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}
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void strPlusChar1()
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{
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// Strange looking pointer arithmetic..
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strPlusChar("void foo()\n"
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"{\n"
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" const char *p = \"/usr\" + '/';\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Unusual pointer arithmetic\n", errout.str());
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}
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void strPlusChar2()
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{
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// Strange looking pointer arithmetic..
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strPlusChar("void foo()\n"
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"{\n"
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" char ch = '/';\n"
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" const char *p = \"/usr\" + ch;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:4]: (error) Unusual pointer arithmetic\n", errout.str());
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}
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void strPlusChar3()
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{
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// Strange looking pointer arithmetic..
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strPlusChar("void foo()\n"
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"{\n"
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" std::string temp = \"/tmp\";\n"
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" std::string path = temp + '/' + \"sub\" + '/';\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void varScope(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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tokenizer.simplifyTokenList();
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// Clear the error buffer..
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errout.str("");
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// Check for redundant code..
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Settings settings;
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settings._checkCodingStyle = true;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.checkVariableScope();
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}
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void varScope1()
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{
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varScope("unsigned short foo()\n"
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"{\n"
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" test_client CClient;\n"
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" try\n"
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" {\n"
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" if (CClient.Open())\n"
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" {\n"
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" return 0;\n"
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" }\n"
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" }\n"
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" catch (...)\n"
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" {\n"
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" return 2;\n"
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" }\n"
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"\n"
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" try\n"
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" {\n"
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" CClient.Close();\n"
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" }\n"
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" catch (...)\n"
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" {\n"
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" return 2;\n"
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" }\n"
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"\n"
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" return 1;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void varScope2()
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{
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varScope("int foo()\n"
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"{\n"
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" Error e;\n"
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" e.SetValue(12);\n"
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" throw e;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void varScope3()
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{
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varScope("void foo()\n"
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"{\n"
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" int i;\n"
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" int *p = 0;\n"
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" if (abc)\n"
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" {\n"
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" p = &i;\n"
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" }\n"
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" *p = 1;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void varScope4()
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{
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varScope("void foo()\n"
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"{\n"
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" int i;\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void varScope5()
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{
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varScope("void f()\n"
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"{\n"
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" int i = 0;\n"
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" if (true) {\n"
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" for ( ; i < 10; ++i) ;\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable i can be limited\n", errout.str());
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}
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void checkNullPointer(const char code[])
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{
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// Tokenize..
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Tokenizer tokenizer;
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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tokenizer.simplifyTokenList();
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tokenizer.setVarId();
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// Clear the error buffer..
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errout.str("");
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// Check for redundant code..
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Settings settings;
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settings._checkCodingStyle = true;
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CheckOther checkOther(&tokenizer, &settings, this);
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checkOther.nullPointer();
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}
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void nullpointer1()
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{
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checkNullPointer("int foo(const Token *tok)\n"
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"{\n"
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" while (tok);\n"
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" tok = tok->next();\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: tok\n", errout.str());
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checkNullPointer("void foo()\n"
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"{\n"
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" for (const Token *tok = tokens; tok; tok = tok->next())\n"
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" {\n"
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" while (tok && tok->str() != \";\")\n"
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" tok = tok->next();\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: tok\n", errout.str());
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checkNullPointer("void foo()\n"
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"{\n"
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" for (const Token *tok = tokens; tok; tok = tok ? tok->next() : NULL)\n"
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" {\n"
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" while (tok && tok->str() != \";\")\n"
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" tok = tok->next();\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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void nullpointer2()
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{
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// Null pointer dereference can only happen with pointers
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checkNullPointer("void foo()\n"
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"{\n"
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" Fred fred;\n"
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" while (fred);\n"
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" fred.hello();\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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}
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// Dereferencing a struct and then checking if it is null
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void nullpointer3()
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{
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// errors..
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checkNullPointer("void foo(struct ABC *abc)\n"
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"{\n"
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" int *a = abc->a;\n"
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" if (!abc)\n"
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" ;\n"
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"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: abc - otherwise it is redundant to check if abc is null at line 4\n", errout.str());
|
|
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" bar(abc->a);\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: abc - otherwise it is redundant to check if abc is null at line 4\n", errout.str());
|
|
|
|
// ok dereferencing in a condition
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" if (abc && abc->a);\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// ok to use a linked list..
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" abc = abc->next;\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// reassign struct..
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" a = abc->a;\n"
|
|
" abc = abc->next;\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" a = abc->a;\n"
|
|
" f(&abc);\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// goto..
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" if (!abc)\n"
|
|
" goto out;"
|
|
" a = abc->a;\n"
|
|
" return;\n"
|
|
"out:\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// loops..
|
|
checkNullPointer("void freeAbc(struct ABC *abc)\n"
|
|
"{\n"
|
|
" while (abc)\n"
|
|
" {\n"
|
|
" struct ABC *next = abc->next;\n"
|
|
" if (abc) delete abc;\n"
|
|
" abc = next;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" int a = abc->a;"
|
|
" do\n"
|
|
" {\n"
|
|
" if (abc)\n"
|
|
" abc = abc->next;\n"
|
|
" --a;\n"
|
|
" }\n"
|
|
" while (a > 0);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
// Dereferencing a pointer and then checking if it is null
|
|
void nullpointer4()
|
|
{
|
|
// errors..
|
|
checkNullPointer("void foo(int *p)\n"
|
|
"{\n"
|
|
" *p = 0;\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: p\n", errout.str());
|
|
|
|
checkNullPointer("void foo(int *p)\n"
|
|
"{\n"
|
|
" bar(*p);\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: p\n", errout.str());
|
|
|
|
// no error
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" int *p;\n"
|
|
" f(&p);\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" int **p = f();\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(int *p)\n"
|
|
"{\n"
|
|
" if (x)\n"
|
|
" p = 0;\n"
|
|
" else\n"
|
|
" *p = 0;\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(int x)\n"
|
|
"{\n"
|
|
" int a = 2 * x;"
|
|
" if (x == 0)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(int *p)\n"
|
|
"{\n"
|
|
" int var1 = p ? *p : 0;\n"
|
|
" if (!p)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void checkOldStylePointerCast(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.warningOldStylePointerCast();
|
|
}
|
|
|
|
void oldStylePointerCast()
|
|
{
|
|
checkOldStylePointerCast("class Base;\n"
|
|
"void foo()\n"
|
|
"{\n"
|
|
" Base * b = (Base *) derived;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
|
|
|
|
checkOldStylePointerCast("class Base;\n"
|
|
"void foo()\n"
|
|
"{\n"
|
|
" Base * b = (const Base *) derived;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
|
|
|
|
checkOldStylePointerCast("class B;\n"
|
|
"class A\n"
|
|
"{\n"
|
|
" virtual void abc(B *) const = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkOldStylePointerCast("class B;\n"
|
|
"class A\n"
|
|
"{\n"
|
|
" virtual void abc(const B *) const = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void checkpostIncrementDecrement(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.postIncrement();
|
|
}
|
|
|
|
void postIncrementDecrementStl()
|
|
{
|
|
checkpostIncrementDecrement("void f1()\n"
|
|
"{\n"
|
|
" std::list<int>::iterator it;\n"
|
|
" for (it = ab.begin(); it != ab.end(); it++)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (possible style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
|
|
|
|
checkpostIncrementDecrement("void f2()\n"
|
|
"{\n"
|
|
" std::list<int>::iterator it;\n"
|
|
" for (it = ab.end(); it != ab.begin(); it--)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (possible style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n", errout.str());
|
|
}
|
|
|
|
void postIncrementDecrementClass()
|
|
{
|
|
checkpostIncrementDecrement("class TestClass;\n"
|
|
"void f1()\n"
|
|
"{\n"
|
|
" TestClass tClass;\n"
|
|
" for (tClass = TestClass.begin(); tClass != TestClass.end(); tClass++)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:5]: (possible style) Pre-Incrementing variable 'tClass' is preferred to Post-Incrementing\n", errout.str());
|
|
|
|
checkpostIncrementDecrement("class TestClass;\n"
|
|
"void f1()\n"
|
|
"{\n"
|
|
" TestClass tClass;\n"
|
|
" for (tClass = TestClass.end(); tClass != TestClass.begin(); tClass--)\n"
|
|
" ;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:5]: (possible style) Pre-Decrementing variable 'tClass' is preferred to Post-Decrementing\n", errout.str());
|
|
}
|
|
|
|
};
|
|
|
|
REGISTER_TEST(TestOther)
|
|
|