/*
* 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(delete1);
TEST_CASE(delete2);
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(nullpointer1);
TEST_CASE(nullpointer2);
TEST_CASE(nullpointer3); // dereferencing struct and then checking if it's null
TEST_CASE(nullpointer4);
TEST_CASE(nullpointer5); // References should not be checked
TEST_CASE(nullpointer6);
TEST_CASE(nullpointer7);
TEST_CASE(nullpointer8);
TEST_CASE(nullpointer9);
TEST_CASE(uninitvar1);
TEST_CASE(uninitvar_alloc); // data is allocated but not initialized
TEST_CASE(uninitvar_arrays); // arrays
TEST_CASE(uninitvar_class); // class/struct
TEST_CASE(uninitvar_enum); // enum variables
TEST_CASE(uninitvar_if); // handling if/while
TEST_CASE(uninitvar_switch); // handling switch
TEST_CASE(uninitvar_references); // references
TEST_CASE(uninitvar_strncpy); // strncpy doesn't always 0-terminate
TEST_CASE(uninitvar_func); // analyse functions
TEST_CASE(oldStylePointerCast);
TEST_CASE(postIncrementDecrementStl);
TEST_CASE(postIncrementDecrementClass);
TEST_CASE(dangerousStrolUsage);
TEST_CASE(passedByValue);
TEST_CASE(mathfunctionCall1);
TEST_CASE(emptyStringTest);
TEST_CASE(fflushOnInputStreamTest);
TEST_CASE(sizeofsizeof);
TEST_CASE(emptyCatchBlock);
TEST_CASE(switchRedundantAssignmentTest);
}
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.checkEmptyCatchBlock();
checkOther.checkRedundantAssignmentInSwitch();
// Simplify token list..
tokenizer.simplifyTokenList();
checkOther.warningRedundantCode();
checkOther.checkZeroDivision();
checkOther.checkMathFunctions();
checkOther.checkEmptyStringTest();
checkOther.checkFflushOnInputStream();
}
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 delete1()
{
check("void foo()\n"
"{\n"
" if (p)\n"
" {\n"
" delete p;\n"
" z = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" if (p)\n"
" delete p;\n"
" else\n"
" p = new P();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" if (0 != g->p)\n"
" delete this->p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" if (0 != g->p)\n"
" {\n"
" delete g->p;\n"
" g->z = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" if (0 != this->g->a)\n"
" delete this->p->a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void delete2()
{
check("void foo()\n"
"{\n"
" if (p)\n"
" {\n"
" delete p;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (p)\n"
" {\n"
" delete p;\n"
" p = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (p)\n"
" delete p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (p != NULL)\n"
" delete p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (p != NULL)\n"
" {\n"
" delete p;\n"
" p = NULL;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (p)\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (0 != this->p)\n"
" delete this->p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void foo()\n"
"{\n"
" if (0 != this->p->a)\n"
" delete this->p->a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void Foo::deleteInstance()\n"
"{\n"
" if (Foo::instance != NULL)\n"
" delete Foo::instance;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
check("void Foo::deleteInstance()\n"
"{\n"
" if (Foo::instance != NULL)\n"
" {\n"
" delete Foo::instance;\n"
" Foo::instance = NULL;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", 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 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.nullConstantDereference();
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 - otherwise it is redundant to check if tok is null at line 5\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());
}
// Execution paths..
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());
checkNullPointer("static void foo()\n"
"{\n"
" int *p = 0;\n"
" int &r = *p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Null pointer dereference\n", errout.str());
checkNullPointer("static void foo(int x)\n"
"{\n"
" int *p = 0;\n"
" int y = 5 + *p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Null pointer dereference\n", errout.str());
checkNullPointer("static void foo(int x)\n"
"{\n"
" Foo<int> *abc = 0;\n"
" abc->a();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: abc\n", errout.str());
checkNullPointer("static void foo()\n"
"{\n"
" int *p(0);\n"
" std::cout << *p;"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Null pointer dereference\n", errout.str());
checkNullPointer("void f()\n"
"{\n"
" char *c = 0;\n"
" {\n"
" delete c;\n"
" }\n"
" c[0] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Possible null pointer dereference: c\n", errout.str());
checkNullPointer("static void foo()\n"
"{\n"
" int *p = 0;\n"
" if (3 > *p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Null pointer dereference\n", errout.str());
checkNullPointer("void f()\n"
"{\n"
" if (x) {\n"
" char *c = 0;\n"
" *c = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Null pointer dereference\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());
checkNullPointer("static void foo()\n"
"{\n"
" int *p = 0;\n"
" exit();\n"
" *p = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkNullPointer("static void foo(int a)\n"
"{\n"
" Foo *p = 0;\n"
" if (a && p)\n"
" p->do_something();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkNullPointer("void foo()\n"
"{\n"
" int sz = sizeof((*(struct dummy *)0).x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkNullPointer("void get_offset(long &offset)\n"
"{\n"
" mystruct * temp; temp = 0;\n"
" offset = (long)(&(temp->z));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// function pointer..
checkNullPointer("void foo()\n"
"{\n"
" void (*f)();\n"
" f = 0;\n"
" f();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Possible null pointer dereference: f\n", errout.str());
checkNullPointer("static void foo()\n"
"{\n"
" int *p = 0;\n"
" int *p2 = 0;\n"
" int r = *p;\n"
" int r2 = *p2;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Null pointer dereference\n"
"[test.cpp:6]: (error) Null pointer dereference\n", errout.str());
}
void nullpointer7()
{
checkNullPointer("void foo()\n"
"{\n"
" wxLongLong x = 0;\n"
" int y = x.GetValue();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void nullpointer8()
{
checkNullPointer("void foo()\n"
"{\n"
" const char * x = 0;\n"
" strdup(x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: x\n", errout.str());
checkNullPointer("void foo()\n"
"{\n"
" char const * x = 0;\n"
" strdup(x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: x\n", errout.str());
}
void nullpointer9() //#ticket 1778
{
checkNullPointer("void foo()\n"
"{\n"
" std::string * x = 0;\n"
" *x = \"test\";\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: x\n", errout.str());
}
void checkUninitVar(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// 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"
" Foo<int> *p;\n"
" p->abcd();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void f(Foo *p)\n"
"{\n"
" int a;\n"
" p->a = malloc(4 * a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\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;\n"
" int y = *x;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *x;\n"
" int &y(*x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int x;\n"
" int *y = &x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int x = xyz::x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static int foo()\n"
"{\n"
" int ret;\n"
" return ret;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ret\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a = 5 + a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a++;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" bar(4 * a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" if (i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" for (int x = 0; i < 10; x++);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" for (int x = 0; x < 10; i++);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static int foo(int x)\n"
"{\n"
" int i;\n"
" if (x)\n"
" i = 0;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int ar[10];\n"
" int i;\n"
" ar[i] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: i\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("static void foo()\n"
"{\n"
" Foo p;\n"
" int x = 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("int a()\n"
"{\n"
" int x;\n"
" return 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("void a()\n"
"{\n"
" int x;\n"
" int *y = &x;\n"
" *y = 0;\n"
" x++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" char x[10], y[10];\n"
" char *z = x;\n"
" memset(z, 0, sizeof(x));\n"
" memcpy(y, x, sizeof(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());
checkUninitVar("void a()\n"
"{\n"
" struct S *s;\n"
" s->x = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s;\n"
" FOREACH() { }\n"
" s->x = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s1;\n"
" struct S *s2;\n"
" FOREACH(s1) { }\n"
" s2->x = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: s2\n", errout.str());
// #1533
checkUninitVar("char a()\n"
"{\n"
" char key;\n"
" struct A msg = { .buf = {&key} };\n"
" init(&msg);\n"
" return key;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *buf = malloc(100);\n"
" struct ABC *abc = buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("class Fred {\n"
"public:\n"
" FILE *f;\n"
" ~Fred();\n"
"}\n"
"Fred::~Fred()\n"
"{\n"
" fclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" ab(sizeof(xyz), &c);\n"
" if (c);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" a = (f2(&c));\n"
" c++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkNullPointer("void f(int a)\n"
"{\n"
" if (a) {\n"
" char *p;\n"
" *p = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: p\n", errout.str());
// +=
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" c += 2;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" *s += 10;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Data is allocated but not initialized: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a[10];\n"
" a[0] += 10;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", 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());
// macro_for..
checkUninitVar("int foo()\n"
"{\n"
" int retval;\n"
" if (condition) {\n"
" for12(1,2) { }\n"
" retval = 1;\n"
" }\n"
" else\n"
" retval = 2;\n"
" return retval;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int i;\n"
" goto exit;\n"
" i++;\n"
"exit:\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// if..
void uninitvar_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("static void foo(int x)\n"
"{\n"
" int a;\n"
" if (x==1);\n"
" if (x==2);\n"
" x = a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\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(int x)\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 foo(int a)\n"
"{\n"
" int n;\n"
" int condition;\n"
" if(a == 1) {\n"
" n=0;\n"
" condition=0;\n"
" }\n"
" else {\n"
" n=1;\n"
" }\n"
"\n"
" if( n == 0) {\n"
" a=condition;\n"
" }\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());
checkUninitVar("int foo()\n"
"{\n"
" int ret;\n"
" if (one())\n"
" ret = 1;\n"
" else\n"
" throw 3;\n"
" return ret;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int f(int a)\n"
"{\n"
" int ret;\n"
" if (a == 1)\n"
" ret = 1;\n"
" else\n"
" XYZ ret = 2;\n" // XYZ may be an unexpanded macro so bailout the checking of "ret".
" return ret;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int f(int a, int b)\n"
"{\n"
" int x;\n"
" if (a)\n"
" x = a;\n"
" else {\n"
" do { } while (f2());\n"
" x = b;\n"
" }\n"
" return x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo(long verbose,bool bFlag)\n"
"{\n"
" double t;\n"
" if (bFlag)\n"
" {\n"
" if (verbose)\n"
" t = 1;\n"
" if (verbose)\n"
" std::cout << (12-t);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// ? :
checkUninitVar("static void foo(int v)\n"
"{\n"
" int x;\n"
" if (v > 0)\n"
" v = func(&x);\n"
" x = v <= 0 ? -1 : x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" const char *msgid1, *msgid2;\n"
" int ret = bar(&msgid1);\n"
" if (ret > 0) {\n"
" ret = bar(&msgid2);\n"
" }\n"
" ret = ret <= 0 ? -1 :\n"
" strcmp(msgid1, msgid2) == 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// while..
checkUninitVar("int f()\n"
"{\n"
" int i;\n"
" while (fgets())\n"
" i = 1;\n"
" return i;"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("void f(int i)\n"
"{\n"
" int a;\n"
" while (i < 10)\n"
" i++;\n"
" a++;"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\n", errout.str());
// ; { .. }
checkUninitVar("int foo()\n"
"{\n"
" int retval;\n"
" if (condition) {\n"
" { }\n"
" retval = 1; }\n"
" else\n"
" retval = 2;\n"
" return retval;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" {\n"
" for (int i = 0; i < 10; ++i)\n"
" { }\n"
" }\n"
"\n"
" { }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// switch..
void uninitvar_switch()
{
checkUninitVar("void f(int x)\n"
"{\n"
" short c;\n"
" switch(x) {\n"
" case 1:\n"
" c++;\n"
" break;\n"
" };\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: c\n", errout.str());
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());
checkUninitVar("int foo(const int iVar, unsigned int slot, unsigned int pin)\n"
"{\n"
" int i;\n"
"\n"
" if (iVar == 0)\n"
" {\n"
" switch (slot)\n"
" {\n"
" case 4: return 5;\n"
" default: return -1;\n"
" }\n"
" }\n"
" else\n"
" {\n"
" switch (pin)\n"
" {\n"
" case 0: i = 2; break;\n"
" default: i = -1; break;\n"
" }\n"
" }\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// No segmentation fault
checkUninitVar("void a() try\n"
"{\n"
" {\n"
" while (1) {\n"
" switch (1) {\n"
" case 1: {\n"
" int i;\n"
" }\n"
" }\n"
" }\n"
" } catch (...) {\n"
" }\n"
"}\n");
}
// arrays..
void uninitvar_arrays()
{
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" a[a[0]] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" char c = *a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" *a = '\\0';\n"
" int i = strlen(a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char a, b[10];\n"
" a = b[0] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
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());
}
// alloc..
void uninitvar_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"
" char *p = malloc(64);\n"
" int x = p[0];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Data is allocated but not initialized: p\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Fred *fred = new Fred;\n"
" fred->foo();\n"
"};\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo(char *s)\n"
"{\n"
" char *a = malloc(100);\n"
" *a = *s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *a;\n"
" if (a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *a = malloc(100);\n"
" if (a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a = 123;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a.word = 123;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a = 123;\n"
" abc->a += 123;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" free(abc);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" if (!s)\n"
" return;\n"
" char c = *s;\n"
"};\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Data is allocated but not initialized: s\n", errout.str());
}
// class / struct..
void uninitvar_class()
{
checkUninitVar("class Fred\n"
"{\n"
" int i;\n"
" int a() { return i; }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
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());
checkUninitVar("void f()\n"
"{\n"
" int i;\n"
" {\n"
" union ab {\n"
" int a,b;\n"
" }\n"
" i = 0;\n"
" }\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// enum..
void uninitvar_enum()
{
checkUninitVar("void f()\n"
"{\n"
" enum AB { a, b };\n"
" AB ab;\n"
" if (ab);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: ab\n", errout.str());
}
// references..
void uninitvar_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());
checkUninitVar("void foo()\n"
"{\n"
" const std::string s(x());\n"
" strchr(s.c_str(), ',');\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// strncpy doesn't always 0-terminate..
void uninitvar_strncpy()
{
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, s, 20);\n"
" strncat(a, s, 20);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Dangerous usage of 'a' (strncpy doesn't always 0-terminate it)\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, \"hello\", 3);\n"
" strncat(a, \"world\", 20);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Dangerous usage of 'a' (strncpy doesn't always 0-terminate it)\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, \"hello\", sizeof(a));\n"
" strncat(a, \"world\", 20);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
std::string analyseFunctions(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
std::set<std::string> f;
const CheckOther checkOther((const Tokenizer *)0, (const Settings *)0, (ErrorLogger *)0);
checkOther.analyse(tokenizer.tokens(), f);
std::string ret;
for (std::set<std::string>::const_iterator it = f.begin(); it != f.end(); ++it)
ret += (ret.empty() ? "" : " ") + *it;
return ret;
}
void uninitvar_func()
{
// function analysis..
ASSERT_EQUALS("foo", analyseFunctions("void foo(int x) { }"));
ASSERT_EQUALS("foo", analyseFunctions("void foo(const int &x) { }"));
ASSERT_EQUALS("foo", analyseFunctions("void foo(int &x) { ++x; }"));
ASSERT_EQUALS("", analyseFunctions("void foo(int &x) { x = 0; }"));
ASSERT_EQUALS("", analyseFunctions("void foo(s x) { }"));
// 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());
checkUninitVar("void f()\n"
"{\n"
" FILE *f;\n"
" fflush(f);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Abc *p;\n"
" int sz = sizeof(*p);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" Foo *p;\n"
" x = bar(sizeof(*p));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" Foo *p;\n"
" x = bar(p->begin());\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("int foo(int x) { return x; }\n"
"void f2()\n"
"{\n"
" int x;\n"
" foo(x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("void foo(const char *s)\n"
"{\n"
" char *p;\n"
" memcpy(p, s, 100);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void foo(const char *s)\n"
"{\n"
" char *p = malloc(100);\n"
" memcpy(p, s, 100);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// using uninitialized function pointer..
checkUninitVar("void foo()\n"
"{\n"
" void (*f)();\n"
" f();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n", 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 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;
settings.inconclusive = 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]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n"
"[test.cpp:6]: (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]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n", errout.str());
checkpostIncrementDecrement("void f2()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.end(); it != ab.begin(); it--)\n"
" ;\n"
" for (it = ab.end(); it != ab.begin(); it--)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n"
"[test.cpp:6]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::list<std::vector<int> >::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::map<int, std::vector<int> >::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\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]: (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]: (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;
settings._checkCodingStyle = true;
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());
}
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 emptyStringTest()
{
check("void foo()\n"
"{\n"
" if (strlen(str) == 0)\n"
" {\n"
" std::cout << str;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Empty string test can be simplified to \"*str == '\\0'\"\n", errout.str());
check("if (!strlen(str)) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Empty string test can be simplified to \"*str == '\\0'\"\n", errout.str());
check("if (strlen(str) == 0) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Empty string test can be simplified to \"*str == '\\0'\"\n", errout.str());
check("if (strlen(str)) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Non-empty string test can be simplified to \"*str != '\\0'\"\n", errout.str());
check("if (strlen(str) > 0) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Non-empty string test can be simplified to \"*str != '\\0'\"\n", errout.str());
check("if (strlen(str) != 0) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Non-empty string test can be simplified to \"*str != '\\0'\"\n", errout.str());
check("if (0 != strlen(str)) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Non-empty string test can be simplified to \"*str != '\\0'\"\n", errout.str());
check("if (0 == strlen(str)) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Empty string test can be simplified to \"*str == '\\0'\"\n", errout.str());
check("if (0 < strlen(str)) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Non-empty string test can be simplified to \"*str != '\\0'\"\n", 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]: (style) 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 emptyCatchBlock()
{
check("void Open(String name)\n"
"{\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch (FileNotFoundException e)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Empty catch block\n", errout.str());
check("void Open(String name)\n"
"{\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch (char *errorMsg)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Empty catch block\n", errout.str());
check("void Open(String name)\n"
"{\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch (const FileNotFoundException& e)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Empty catch block\n", errout.str());
check("void Open(String name)\n"
"{\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch (...)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Empty catch block\n", errout.str());
check("void Open(String name)\n"
"{\n"
" try\n"
" {\n"
" foo();\n"
" }\n"
" catch (const FileNotFoundException& e)\n"
" {\n"
" prinf(\"File not found\");\n"
" }\n"
"}\n");
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]: (style) 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]: (style) 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"
" 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());
}
};
REGISTER_TEST(TestOther)
