cppcheck/test/testother.cpp

1486 lines
47 KiB
C++

/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "tokenize.h"
#include "checkother.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestOther : public TestFixture
{
public:
TestOther() : TestFixture("TestOther")
{ }
private:
void run()
{
TEST_CASE(zeroDiv1);
TEST_CASE(zeroDiv2);
TEST_CASE(zeroDiv3);
TEST_CASE(zeroDiv4);
TEST_CASE(sprintf1); // Dangerous usage of sprintf
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4); // struct member
TEST_CASE(strPlusChar1); // "/usr" + '/'
TEST_CASE(strPlusChar2); // "/usr" + ch
TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
TEST_CASE(varScope1);
TEST_CASE(varScope2);
TEST_CASE(varScope3);
TEST_CASE(varScope4);
TEST_CASE(varScope5);
TEST_CASE(varScope6);
TEST_CASE(varScope7);
TEST_CASE(varScope8);
TEST_CASE(varScope9); // classes may have extra side-effects
TEST_CASE(varScope10); // Undefined macro FOR
TEST_CASE(oldStylePointerCast);
TEST_CASE(dangerousStrolUsage);
TEST_CASE(passedByValue);
TEST_CASE(mathfunctionCall1);
TEST_CASE(fflushOnInputStreamTest);
TEST_CASE(sizeofsizeof);
TEST_CASE(sizeofCalculation);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(selfAssignment);
TEST_CASE(testScanf1);
TEST_CASE(testScanf2);
TEST_CASE(trac1132);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction);
TEST_CASE(testMisusedScopeObjectPicksClass);
TEST_CASE(testMisusedScopeObjectPicksStruct);
TEST_CASE(testMisusedScopeObjectDoesNotPickIf);
TEST_CASE(testMisusedScopeObjectDoesNotPickConstructorDeclaration);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunctor);
TEST_CASE(testMisusedScopeObjectDoesNotPickLocalClassConstructors);
TEST_CASE(testMisusedScopeObjectDoesNotPickUsedObject);
TEST_CASE(trac2071);
TEST_CASE(trac2084);
TEST_CASE(assignmentInAssert);
TEST_CASE(incorrectLogicOperator);
}
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check..
Settings settings;
settings._checkCodingStyle = true;
CheckOther checkOther(&tokenizer, &settings, this);
// Clear the error buffer..
errout.str("");
checkOther.sizeofsizeof();
checkOther.sizeofCalculation();
checkOther.checkRedundantAssignmentInSwitch();
checkOther.checkAssignmentInAssert();
// Simplify token list..
tokenizer.simplifyTokenList();
checkOther.checkZeroDivision();
checkOther.checkMathFunctions();
checkOther.checkFflushOnInputStream();
checkOther.checkSelfAssignment();
checkOther.invalidScanf();
checkOther.checkMisusedScopedObject();
checkOther.checkIncorrectLogicOperator();
}
void zeroDiv1()
{
check("void foo()\n"
"{\n"
" int a = 0;\n"
" double b = 1.;\n"
" cout<<b/a;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Division by zero\n", errout.str());
}
void zeroDiv2()
{
check("void foo()\n"
"{\n"
" int sum = 0;\n"
" int n = 100;\n"
" for(int i = 0; i < n; i ++)\n"
" {\n"
" sum += i; \n"
" }\n"
" cout<<b/sum;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int a = 0 ? (2/0) : 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv3()
{
check("void f()\n"
"{\n"
" div_t divresult = div (1,0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
}
void zeroDiv4()
{
check("void f()\n"
"{\n"
" long a = b / 0x6;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0x0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0L;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0ul;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0L);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0x5);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Don't warn about floating points (gcc doesn't warn either)
// and floating points are handled differently than integers.
check("void f()\n"
"{\n"
" long a = b / 0.0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0.5;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Don't warn about 0.0
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.5);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintfUsage(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
//tokenizer.tokens()->printOut( "tokens" );
// Clear the error buffer..
errout.str("");
// Check for redundant code..
Settings settings;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.invalidFunctionUsage();
}
void sprintf1()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%s\",buf);\n"
"}\n");
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());
}
void sprintf2()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf3()
{
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
" if (buf[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sprintf4()
{
sprintfUsage("struct A\n"
"{\n"
" char filename[128];\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" const char* filename = \"hello\";\n"
" struct A a;\n"
" snprintf(a.filename, 128, \"%s\", filename);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar(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;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.strPlusChar();
}
void strPlusChar1()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" const char *p = \"/usr\" + '/';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Unusual pointer arithmetic\n", errout.str());
}
void strPlusChar2()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" char ch = 1;\n"
" const char *p = ch + \"/usr\";\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" int i = 1;\n"
" const char* psz = \"Bla\";\n"
" const std::string str = i + psz;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar3()
{
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" std::string temp = \"/tmp\";\n"
" std::string path = temp + '/' + \"sub\" + '/';\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope(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.checkVariableScope();
}
void varScope1()
{
varScope("unsigned short foo()\n"
"{\n"
" test_client CClient;\n"
" try\n"
" {\n"
" if (CClient.Open())\n"
" {\n"
" return 0;\n"
" }\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" try\n"
" {\n"
" CClient.Close();\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" return 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope2()
{
varScope("int foo()\n"
"{\n"
" Error e;\n"
" e.SetValue(12);\n"
" throw e;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope3()
{
varScope("void foo()\n"
"{\n"
" int i;\n"
" int *p = 0;\n"
" if (abc)\n"
" {\n"
" p = &i;\n"
" }\n"
" *p = 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope4()
{
varScope("void foo()\n"
"{\n"
" int i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope5()
{
varScope("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable i can be reduced\n", errout.str());
varScope("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {b()}\n"
" else {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable i can be reduced\n", errout.str());
}
void varScope6()
{
varScope("void f(int x)\n"
"{\n"
" int i = x;\n"
" if (a) {\n"
" x++;\n"
" }\n"
" if (b) {\n"
" c(i);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
varScope("void f()\n"
"{\n"
"int foo = 0;\n"
"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 varScope8()
{
varScope("void test() {\n"
" float edgeResistance=1;\n"
" std::vector<int> edges;\n"
" BOOST_FOREACH(int edge, edges) {\n"
" edgeResistance = (edge+1) / 2.0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable edgeResistance can be reduced\n", errout.str());
}
void varScope9()
{
// classes may have extra side effects
varScope("class fred {\n"
"public:\n"
" void x();\n"
"};\n"
"void test(int a) {\n"
" fred f;\n"
" if (a == 2) {\n"
" f.x();\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope10()
{
// classes may have extra side effects
varScope("int f()\n"
"{\n"
" int x = 0;\n"
" FOR {\n"
" foo(x++);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkOldStylePointerCast(const char code[])
{
// Tokenize..
Tokenizer tokenizerCpp;
std::istringstream istr(code);
tokenizerCpp.tokenize(istr, "test.cpp");
tokenizerCpp.setVarId();
Tokenizer tokenizerC;
std::istringstream istr2(code);
tokenizerC.tokenize(istr2, "test.c");
tokenizerC.setVarId();
// Clear the error buffer..
errout.str("");
// Check for redundant code..
Settings settings;
settings._checkCodingStyle = true;
CheckOther checkOtherCpp(&tokenizerCpp, &settings, this);
checkOtherCpp.warningOldStylePointerCast();
CheckOther checkOtherC(&tokenizerC, &settings, this);
checkOtherC.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 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;
settings._checkCodingStyle = true;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkConstantFunctionParameter();
}
void passedByValue()
{
testPassedByValue("void f(const std::string str) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
testPassedByValue("class Foo;\nvoid f(const Foo foo) {}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' is passed by value. It could be passed by reference instead, to make it faster.\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]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
testPassedByValue("void f(const std::vector<std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\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]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
testPassedByValue("void f(const std::map<int,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' is passed by value. It could be passed by reference instead, to make it faster.\n", errout.str());
}
void mathfunctionCall1()
{
// log|log10
check("void foo()\n"
"{\n"
" std::cout << log(-2) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -2 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1. to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-0.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -0.1 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0. to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0.0 to log() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E+3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::string *log(0);\n"
"}");
ASSERT_EQUALS("", errout.str());
// acos
check("void foo()\n"
"{\n"
" std::cout << acos(1) << std::endl;\n"
" std::cout << acos(-1) << std::endl;\n"
" std::cout << acos(0.1) << std::endl;\n"
" std::cout << acos(0.0001) << std::endl;\n"
" std::cout << acos(0.01) << std::endl;\n"
" std::cout << acos(1.0E-1) << std::endl;\n"
" std::cout << acos(-1.0E-1) << std::endl;\n"
" std::cout << acos(+1.0E-1) << std::endl;\n"
" std::cout << acos(0.1E-1) << std::endl;\n"
" std::cout << acos(+0.1E-1) << std::endl;\n"
" std::cout << acos(-0.1E-1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 1.1 to acos() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.1 to acos() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-110) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -110 to acos() leads to undefined result\n", errout.str());
// atan2
check("void foo()\n"
"{\n"
" std::cout << atan2(1,1) << std::endl;\n"
" std::cout << atan2(-1,-1) << std::endl;\n"
" std::cout << atan2(0.1,1) << std::endl;\n"
" std::cout << atan2(0.0001,100) << std::endl;\n"
" std::cout << atan2(0.01m-1) << std::endl;\n"
" std::cout << atan2(1.0E-1,-3) << std::endl;\n"
" std::cout << atan2(-1.0E-1,+2) << std::endl;\n"
" std::cout << atan2(+1.0E-1,0) << std::endl;\n"
" std::cout << atan2(0.1E-1,3) << std::endl;\n"
" std::cout << atan2(+0.1E-1,1) << std::endl;\n"
" std::cout << atan2(-0.1E-1,8) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << atan2(0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 and 0 to atan2() leads to undefined result\n", errout.str());
// fmod
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 1.0 and 0 to fmod() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// pow
check("void foo()\n"
"{\n"
" std::cout << pow(0,-10) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 and -10 to pow() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << pow(0,10) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// sqrt
check("void foo()\n"
"{\n"
" std::cout << sqrt(-1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1 to sqrt() leads to undefined result\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << sqrt(1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void fflushOnInputStreamTest()
{
check("void foo()\n"
"{\n"
" fflush(stdin);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) fflush() called on input stream \"stdin\" may result in undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" fflush(stdout);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeofsizeof()
{
check("void foo()\n"
"{\n"
" int i = sizeof sizeof char;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious code 'sizeof sizeof ..', most likely there should only be one sizeof. The current code is equivalent to 'sizeof(size_t)'.\n", errout.str());
}
void sizeofCalculation()
{
check("sizeof(a+b)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof()\n", errout.str());
check("sizeof(-a)");
ASSERT_EQUALS("", errout.str());
check("sizeof(void * const)");
ASSERT_EQUALS("", errout.str());
}
void switchRedundantAssignmentTest()
{
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (warning) Redundant assignment of \"y\" in switch\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (warning) Redundant assignment of \"y\" in switch\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" if (x)\n"
" {\n"
" y = 3;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" if (y)\n"
" printf(\"%d\", y);\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int x = a;\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" x = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" {\n"
" int y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" break;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" continue;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" printf(\"%d\", y);\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void selfAssignment()
{
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (warning) Redundant assignment of \"x\" to itself\n", errout.str());
check("void foo()\n"
"{\n"
" int x = x;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of \"x\" to itself\n", errout.str());
check("void foo()\n"
"{\n"
" std::string var = var = \"test\";\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of \"var\" to itself\n", errout.str());
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x + 1;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void testScanf1()
{
check("#include <stdio.h>\n"
"int main(int argc, char **argv)\n"
"{\n"
" int a, b;\n"
" FILE *file = fopen(\"test\", \"r\");\n"
" b = fscanf(file, \"aa %ds\", &a);\n"
" c = scanf(\"aa %ds\", &a);\n"
" b = fscanf(file, \"aa%%ds\", &a);\n"
" fclose(file);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) scanf without field width limits can crash with huge input data\n"
"[test.cpp:7]: (warning) scanf without field width limits can crash with huge input data\n", errout.str());
}
void testScanf2()
{
check("#include <stdio.h>\n"
"int main(int argc, char **argv)\n"
"{\n"
" int a, b;\n"
" FILE *file = fopen(\"test\", \"r\");\n"
" b = fscanf(file, \"aa%%%ds\", &a);\n"
" c = scanf(\"aa %%%ds\", &a);\n"
" b = fscanf(file, \"aa%%ds\", &a);\n"
" fclose(file);\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) scanf without field width limits can crash with huge input data\n"
"[test.cpp:7]: (warning) scanf without field width limits can crash with huge input data\n", errout.str());
}
void trac1132()
{
errout.str("");
std::istringstream code("#include <iostream>\n"
"class Lock\n"
"{\n"
"public:\n"
" Lock(int i)\n"
" {\n"
" std::cout << \"Lock \" << i << std::endl;\n"
" }\n"
" ~Lock()\n"
" {\n"
" std::cout << \"~Lock\" << std::endl;\n"
" }\n"
"};\n"
"int main()\n"
"{\n"
" Lock(123);\n"
" std::cout << \"hello\" << std::endl;\n"
" return 0;\n"
"}\n"
);
Tokenizer tokenizer;
tokenizer.tokenize(code, "trac1132.cpp");
tokenizer.simplifyTokenList();
Settings settings;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkMisusedScopedObject();
ASSERT_EQUALS("[trac1132.cpp:16]: (error) instance of \"Lock\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction()
{
check("int main ( )\n"
"{\n"
" CouldBeFunction ( 123 ) ;\n"
" return 0 ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectPicksClass()
{
check("class NotAFunction ;\n"
"int function ( )\n"
"{\n"
" NotAFunction ( 123 );\n"
" return 0 ;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (error) instance of \"NotAFunction\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectPicksStruct()
{
check("struct NotAClass;\n"
"bool func ( )\n"
"{\n"
" NotAClass ( 123 ) ;\n"
" return true ;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (error) instance of \"NotAClass\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickIf()
{
check("bool func( int a , int b , int c )\n"
"{\n"
" if ( a > b ) return c == a ;\n"
" return b == a ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickConstructorDeclaration()
{
check("class Something : public SomthingElse\n"
"{\n"
"public:\n"
"~Something ( ) ;\n"
"Something ( ) ;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunctor()
{
check("\n"
"#include <algorithm>\n"
"\n"
"class IncrementFunctor\n"
"{\n"
"public:\n"
" void operator()(int &i)\n"
" {\n"
" ++i;\n"
" }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" int a = 1;\n"
" IncrementFunctor()(a);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickLocalClassConstructors()
{
check("void f() {\n"
" class Foo {\n"
" Foo() { }\n"
" Foo(int a) { }\n"
" Foo(int a, int b) { }\n"
" };\n"
" Foo();\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:7]: (error) instance of \"Foo\" object destroyed immediately\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickUsedObject()
{
check("struct Foo {\n"
" void bar() {\n"
" }\n"
"};\n"
"\n"
"void fn() {\n"
" Foo().bar();\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void trac2084()
{
check("#include <signal.h>\n"
"\n"
"void f()\n"
"{\n"
" struct sigaction sa;\n"
"\n"
" { sigaction(SIGHUP, &sa, 0); };\n"
" { sigaction(SIGINT, &sa, 0); };\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void trac2071()
{
check("void f() {\n"
" struct AB {\n"
" AB(int a) { }\n"
" };\n"
"\n"
" const AB ab[3] = { AB(0), AB(1), AB(2) };\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void assignmentInAssert()
{
check("void f() {\n"
" int a = 0;\n"
" assert(a = 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'. If the modification is needed in release builds there is a bug.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a == 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" int b = 0;\n"
" assert(a == 2 && b = 1);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (warning) Assert statement modifies 'b'. If the modification is needed in release builds there is a bug.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a += 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'. If the modification is needed in release builds there is a bug.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a *= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'. If the modification is needed in release builds there is a bug.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a -= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'. If the modification is needed in release builds there is a bug.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a --);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'. If the modification is needed in release builds there is a bug.\n", errout.str());
}
void incorrectLogicOperator()
{
check("void f(int x) {\n"
" if ((x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (x != 1 || x != 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x) {\n"
" if (1 != x || 3 != x)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x, int y) {\n"
" if (x != 1 || y != 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((y == 1) && (x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (x != 3) && (y == 1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x != 1) && (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x == 1) || (x == 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (y != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != hotdog) || (y != hotdog))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 5) || (y != 5))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" const int ERR1 = 5;\n"
" const int ERR2 = 6;\n"
" if ((x != ERR1) || (x != ERR2))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:4]: (warning) Mutual exclusion over || always evaluates to true. Did you intend to use && instead?\n", errout.str());
check("void f(int x, int y) {\n"
" const int ERR1 = 5;\n"
" if ((x != ERR1) || (y != ERR1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestOther)