1517 lines
50 KiB
C++
1517 lines
50 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 "tokenize.h"
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#include "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(varScope6);
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TEST_CASE(varScope7);
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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(nullpointer5); // References should not be checked
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TEST_CASE(nullpointer6);
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TEST_CASE(nullpointer7);
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TEST_CASE(uninitvar1);
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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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TEST_CASE(dangerousStrolUsage);
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TEST_CASE(passedByValue);
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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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// Don't warn about floating points (gcc doesn't warn either)
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// and floating points are handled differently than integers.
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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("", 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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// Don't warn about 0.0
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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("", 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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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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" else\n"
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" p = new P();\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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" if (0 != g->p)\n"
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" delete this->p;\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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" if (0 != this->g->a)\n"
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" delete this->p->a;\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()\n"
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"{\n"
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" if (0 != this->p->a)\n"
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" delete this->p->a;\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) Undefined behaviour: buf is used wrong in call to sprintf or snprintf. Quote: If copying takes place between objects that overlap as a result of a call to sprintf() or snprintf(), the results are undefined.\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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// 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(int x)\n"
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"{\n"
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" int i = 0;\n"
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" if (x) {\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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varScope("void f(int x)\n"
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"{\n"
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" int i = 0;\n"
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" if (x) {b()}\n"
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" else {\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 varScope6()
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{
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varScope("void f(int x)\n"
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"{\n"
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" int i = x;\n"
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" if (a) {\n"
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" x++;\n"
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" }\n"
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" if (b) {\n"
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" c(i);\n"
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" }\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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varScope("void f()\n"
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"{\n"
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"int foo = 0;\n"
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"std::vector<int> vec(10);\n"
|
|
"BOOST_FOREACH(int& i, vec)\n"
|
|
"{\n"
|
|
" foo += 1;\n"
|
|
" if(foo == 10)\n"
|
|
" {\n"
|
|
" return 0;\n"
|
|
" }\n"
|
|
"}\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
varScope("void f(int &x)\n"
|
|
"{\n"
|
|
" int n = 1;\n"
|
|
" do\n"
|
|
" {\n"
|
|
" ++n;\n"
|
|
" ++x;\n"
|
|
" } while (x);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void varScope7()
|
|
{
|
|
varScope("void f(int x)\n"
|
|
"{\n"
|
|
" int y = 0;\n"
|
|
" b(y);\n"
|
|
" if (x) {\n"
|
|
" y++;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void checkNullPointer(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.nullPointer();
|
|
|
|
tokenizer.simplifyTokenList();
|
|
checkOther.executionPaths();
|
|
}
|
|
|
|
|
|
void nullpointer1()
|
|
{
|
|
checkNullPointer("int foo(const Token *tok)\n"
|
|
"{\n"
|
|
" while (tok);\n"
|
|
" tok = tok->next();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: tok\n", errout.str());
|
|
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" for (const Token *tok = tokens; tok; tok = tok->next())\n"
|
|
" {\n"
|
|
" while (tok && tok->str() != \";\")\n"
|
|
" tok = tok->next();\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Possible null pointer dereference: tok\n", errout.str());
|
|
|
|
checkNullPointer("void foo(Token &tok)\n"
|
|
"{\n"
|
|
" for (int i = 0; i < tok.size(); i++ )\n"
|
|
" {\n"
|
|
" while (!tok)\n"
|
|
" char c = tok.read();\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" for (const Token *tok = tokens; tok; tok = tok->next())\n"
|
|
" {\n"
|
|
" while (tok && tok->str() != \";\")\n"
|
|
" tok = tok->next();\n"
|
|
" if( !tok ) break;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" for (const Token *tok = tokens; tok; tok = tok ? tok->next() : NULL)\n"
|
|
" {\n"
|
|
" while (tok && tok->str() != \";\")\n"
|
|
" tok = tok->next();\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("void foo(A*a)\n"
|
|
"{\n"
|
|
" switch (a->b()) {\n"
|
|
" case 1:\n"
|
|
" while( a ){\n"
|
|
" a = a->next;\n"
|
|
" }\n"
|
|
" break;\n"
|
|
" case 2:\n"
|
|
" a->b();\n"
|
|
" break;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void nullpointer2()
|
|
{
|
|
// Null pointer dereference can only happen with pointers
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" Fred fred;\n"
|
|
" while (fred);\n"
|
|
" fred.hello();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
// Dereferencing a struct and then checking if it is null
|
|
void nullpointer3()
|
|
{
|
|
// errors..
|
|
checkNullPointer("void foo(struct ABC *abc)\n"
|
|
"{\n"
|
|
" int a = abc->a;\n"
|
|
" if (!abc)\n"
|
|
" ;\n"
|
|
"}\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"
|
|
" int 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"
|
|
" int 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"
|
|
" int a;\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());
|
|
|
|
// dynamic_cast..
|
|
checkNullPointer("void foo(ABC *abc)\n"
|
|
"{\n"
|
|
" int a = abc->a;\n"
|
|
" if (!dynamic_cast<DEF *>(abc))\n"
|
|
" ;\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());
|
|
|
|
checkNullPointer("void foo(P *p)\n"
|
|
"{\n"
|
|
" while (p)\n"
|
|
" if (p->check())\n"
|
|
" break;\n"
|
|
" else\n"
|
|
" p = p->next();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void nullpointer5()
|
|
{
|
|
// errors..
|
|
checkNullPointer("void foo(A &a)\n"
|
|
"{\n"
|
|
" char c = a.c();\n"
|
|
" if (!a)\n"
|
|
" return;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void nullpointer6()
|
|
{
|
|
// errors..
|
|
checkNullPointer("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p = 0;\n"
|
|
" if (a == 1)\n"
|
|
" p = new FooBar;\n"
|
|
" else if (a == 2)\n"
|
|
" p = new FooCar;\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:8]: (error) Possible null pointer dereference: p\n", errout.str());
|
|
|
|
checkNullPointer("static void foo()\n"
|
|
"{\n"
|
|
" int *p = 0;\n"
|
|
" int *q = p;\n"
|
|
" q[0] = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:5]: (error) Possible null pointer dereference: q\n", errout.str());
|
|
|
|
// no false positive..
|
|
checkNullPointer("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p = 0;\n"
|
|
" p = new Foo;\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkNullPointer("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p = 0;\n"
|
|
" if (!p)\n"
|
|
" return;\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void nullpointer7()
|
|
{
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" wxLongLong x = 0;\n"
|
|
" int y = x.GetValue();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void checkUninitVar(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.executionPaths();
|
|
}
|
|
|
|
void uninitvar1()
|
|
{
|
|
// dereferencing uninitialized pointer..
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p;\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" int *p;\n"
|
|
" delete p;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" int *p;\n"
|
|
" delete [] p;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" int *p;\n"
|
|
" *p = 135;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" int x, y;\n"
|
|
" x = (y = 10);\n"
|
|
" int z = y * 2;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" Foo p;\n"
|
|
" p.abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("A a()\n"
|
|
"{\n"
|
|
" A ret;\n"
|
|
" return ret;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void a()\n"
|
|
"{\n"
|
|
" int x;\n"
|
|
" int y = x;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
|
|
|
|
checkUninitVar("void a()\n"
|
|
"{\n"
|
|
" int x[10];\n"
|
|
" int *y = x;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int a()\n"
|
|
"{\n"
|
|
" int ret;\n"
|
|
" std::cin >> ret;\n"
|
|
" return ret;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int a()\n"
|
|
"{\n"
|
|
" int ret;\n"
|
|
" asm();\n"
|
|
" return ret;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void a()\n"
|
|
"{\n"
|
|
" int x[10];\n"
|
|
" struct xyz xyz1 = { .x = x };\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// goto..
|
|
checkUninitVar("void foo(int x)\n"
|
|
"{\n"
|
|
" long b;\n"
|
|
" if (g()) {\n"
|
|
" b =2;\n"
|
|
" goto found;\n"
|
|
" }\n"
|
|
"\n"
|
|
" return;\n"
|
|
"\n"
|
|
"found:\n"
|
|
" int a = b;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
|
|
// if..
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p;\n"
|
|
" if (x)\n"
|
|
" p = new Foo;\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: p\n", errout.str());
|
|
|
|
checkUninitVar("int foo()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" if (x)\n"
|
|
" i = 22;\n"
|
|
" else\n"
|
|
" i = 33;\n"
|
|
" return i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int foo()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" if (x)\n"
|
|
" i = 22;\n"
|
|
" else\n"
|
|
" {\n"
|
|
" char *y = {0};\n"
|
|
" i = 33;\n"
|
|
" }\n"
|
|
" return i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int foo()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" if (x)\n"
|
|
" {\n"
|
|
" struct abc abc1 = (struct abc) { .a=0, .b=0, .c=0 };\n"
|
|
" i = 22;\n"
|
|
" }\n"
|
|
" else\n"
|
|
" {\n"
|
|
" i = 33;\n"
|
|
" }\n"
|
|
" return i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("static void foo()\n"
|
|
"{\n"
|
|
" Foo *p;\n"
|
|
" if (x)\n"
|
|
" p = new Foo;\n"
|
|
" if (x)\n"
|
|
" p->abcd();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" C *c;\n"
|
|
" if (fun(&c));\n"
|
|
" c->Release();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int foo(int x)\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" if (one())\n"
|
|
" i = 1;\n"
|
|
" else\n"
|
|
" return 3;\n"
|
|
" return i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// switch..
|
|
checkUninitVar("char * f()\n"
|
|
"{\n"
|
|
" static char ret[200];\n"
|
|
" memset(ret, 0, sizeof(ret));\n"
|
|
" switch (x)\n"
|
|
" {\n"
|
|
" case 1: return ret;\n"
|
|
" case 2: return ret;\n"
|
|
" }\n"
|
|
" return 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
|
|
// member variables..
|
|
checkUninitVar("class Fred\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" int a() { return i; }\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// function calls..
|
|
checkUninitVar("void assignOne(int &x)\n"
|
|
"{ x = 1; }\n"
|
|
"\n"
|
|
"int f()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" assignOne(i);\n"
|
|
" return i;\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int f(int (*assign)(int *p))\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" (*assign)(&i);\n"
|
|
" return i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("int f()\n"
|
|
"{\n"
|
|
" char s[10];\n"
|
|
" return bar(s);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// arrays..
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char a[10], b[10];\n"
|
|
" a[0] = b[0] = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char a[10], *p;\n"
|
|
" *(p = a) = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char c[50] = \"\";\n"
|
|
" strcat(c, \"test\");\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char s[20];\n"
|
|
" strcpy(s2, s);\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char s[20];\n"
|
|
" strcat(s, \"abc\");\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char s[20];\n"
|
|
" strchr(s, ' ');\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char s[20];\n"
|
|
" strncpy(s, \"abcde\", 2);\n"
|
|
" strcat(s, \"abc\");\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: s\n", errout.str());
|
|
|
|
// alloc..
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char *s = malloc(100);\n"
|
|
" strcat(s, \"abc\");\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Data is allocated but not initialized: s\n", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" char *s1 = new char[10];\n"
|
|
" char *s2 = new char[strlen(s1)];\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Data is allocated but not initialized: s1\n", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" Fred *fred = new Fred;\n"
|
|
" fred->foo();\n"
|
|
"};\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// struct..
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" struct Relative {\n"
|
|
" Surface *surface;\n"
|
|
" void MoveTo(int x, int y) {\n"
|
|
" surface->MoveTo();\n"
|
|
" }\n"
|
|
" };\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" static const struct ab {\n"
|
|
" int a,b;\n"
|
|
" int get_a() { return a; }"
|
|
" } = { 0, 0 };\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// references..
|
|
checkUninitVar("void f()\n"
|
|
"{\n"
|
|
" int a;\n"
|
|
" int &b = a;\n"
|
|
" b = 0;\n"
|
|
" int x = a;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
checkUninitVar("void f(struct blame_entry *ent)\n"
|
|
"{\n"
|
|
" struct origin *suspect = ent->suspect;\n"
|
|
" char hex[41];\n"
|
|
" strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));\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 Base;\n"
|
|
"void foo()\n"
|
|
"{\n"
|
|
" Base * b = (const Base *) ( new 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 *) new 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 *) new short[10];\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());
|
|
}
|
|
|
|
void dangerousStrolUsage()
|
|
{
|
|
{
|
|
sprintfUsage("int f(const char *num)\n"
|
|
"{\n"
|
|
" return strtol(num, NULL, 1);\n"
|
|
"}\n");
|
|
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Invalid radix in call to strtol or strtoul. Must be 0 or 2-36\n", errout.str());
|
|
}
|
|
|
|
{
|
|
sprintfUsage("int f(const char *num)\n"
|
|
"{\n"
|
|
" return strtol(num, NULL, 10);\n"
|
|
"}\n");
|
|
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
}
|
|
|
|
void testPassedByValue(const char code[])
|
|
{
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
Settings settings;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.checkConstantFunctionParameter();
|
|
}
|
|
|
|
void passedByValue()
|
|
{
|
|
testPassedByValue("void f(const std::string str) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'str' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("class Foo;\nvoid f(const Foo foo) {}");
|
|
ASSERT_EQUALS("[test.cpp:2]: (style) Function parameter 'foo' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::string &str) {}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
testPassedByValue("void f(const std::vector<int> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::vector<std::string> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::vector<int> &v) {}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
testPassedByValue("void f(const std::map<int,int> &v) {}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
testPassedByValue("void f(const std::map<int,int> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::map<std::string,std::string> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::map<int,std::string> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
|
|
testPassedByValue("void f(const std::map<std::string,int> v) {}");
|
|
ASSERT_EQUALS("[test.cpp:1]: (style) Function parameter 'v' is passed by value. It could be passed by reference instead.\n", errout.str());
|
|
}
|
|
|
|
};
|
|
|
|
REGISTER_TEST(TestOther)
|
|
|