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cppcheck/test/teststl.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam,
* Leandro Penz, Kimmo Varis, Vesa Pikki
*
* 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 "../src/tokenize.h"
#include "../src/checkstl.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestStl : public TestFixture
{
public:
TestStl() : TestFixture("TestStl")
{ }
private:
void run()
{
TEST_CASE(iterator1);
TEST_CASE(iterator2);
TEST_CASE(iterator3);
TEST_CASE(dereference);
TEST_CASE(STLSize);
TEST_CASE(STLSizeNoErr);
TEST_CASE(erase);
TEST_CASE(eraseBreak);
TEST_CASE(eraseReturn);
TEST_CASE(eraseGoto);
TEST_CASE(eraseAssign);
TEST_CASE(eraseErase);
TEST_CASE(pushback1);
TEST_CASE(pushback2);
TEST_CASE(pushback3);
TEST_CASE(pushback4);
TEST_CASE(insert1);
TEST_CASE(invalidcode);
TEST_CASE(stlBoundries1);
}
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
// Clear the error buffer..
errout.str("");
// Check..
CheckStl checkStl;
checkStl.runSimplifiedChecks(&tokenizer, (const Settings *)0, this);
}
void iterator1()
{
check("void f()\n"
"{\n"
" list<int> l1;\n"
" list<int> l2;\n"
" for (list<int>::iterator it = l1.begin(); it != l2.end(); ++it)\n"
" { }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with both l1 and l2\n", errout.str());
}
void iterator2()
{
check("void foo()\n"
"{\n"
" list<int> l1;\n"
" list<int> l2;\n"
" list<int>::iterator it = l1.begin();\n"
" while (it != l2.end())\n"
" {\n"
" ++it;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Same iterator is used with both l1 and l2\n", errout.str());
}
void iterator3()
{
check("void foo()\n"
"{\n"
" list<int> l1;\n"
" list<int> l2;\n"
" list<int>::iterator it = l1.begin();\n"
" l2.insert(it, 0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Same iterator is used with both l1 and l2\n", errout.str());
}
// Dereferencing invalid pointer
void dereference()
{
check("void f()\n"
"{\n"
" std::vector<int> ints;"
" std::vector<int>::iterator iter;\n"
" iter = ints.begin() + 2;\n"
" ints.erase(iter);\n"
" std::cout << (*iter) << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Dereferenced iterator 'iter' has been erased\n", errout.str());
}
void STLSize()
{
check("void foo()\n"
"{\n"
" std::vector<int> foo;\n"
" for (unsigned int ii = 0; ii <= foo.size(); ++ii)\n"
" {\n"
" foo[ii] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:6]: (error) When ii==foo.size(), foo[ii] is out of bounds\n"), errout.str());
}
void STLSizeNoErr()
{
{
check("void foo()\n"
"{\n"
" std::vector<int> foo;\n"
" for (unsigned int ii = 0; ii < foo.size(); ++ii)\n"
" {\n"
" foo[ii] = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
{
check("void foo()\n"
"{\n"
" std::vector<int> foo;\n"
" for (unsigned int ii = 0; ii <= foo.size(); ++ii)\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
{
check("void foo()\n"
"{\n"
" std::vector<int> foo;\n"
" for (unsigned int ii = 0; ii <= foo.size(); ++ii)\n"
" {\n"
" if (ii == foo.size())\n"
" {\n"
" }\n"
" else\n"
" {\n"
" foo[ii] = 0;\n"
" }\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
}
void erase()
{
{
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Dangerous usage of erase\n", errout.str());
}
{
check("for (it = foo.begin(); it != foo.end(); ++it)\n"
"{\n"
" foo.erase(it);\n"
"}\n"
"for (it = foo.begin(); it != foo.end(); ++it)\n"
"{\n"
" foo.erase(it);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of erase\n[test.cpp:7]: (error) Dangerous usage of erase\n", errout.str());
}
}
void eraseBreak()
{
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void eraseReturn()
{
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" return;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void eraseGoto()
{
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" goto abc;\n"
" }\n"
"bar:\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void eraseAssign()
{
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" it = foo.begin();\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void eraseErase()
{
check("void f(std::vector<ints> &ints)\n"
"{\n"
" std::vector<int>::iterator iter;\n"
" iter = ints.begin() + 2;\n"
" ints.erase(iter);\n"
" ints.erase(iter);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Erasing invalid iterator\n", errout.str());
}
void pushback1()
{
check("void f()\n"
"{\n"
" std::vector<int>::const_iterator it = foo.begin();\n"
" foo.push_back(123);\n"
" *it;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) After push_back or push_front, the iterator 'it' may be invalid\n", errout.str());
}
void pushback2()
{
check("void f()\n"
"{\n"
" std::vector<int>::const_iterator it = foo.begin();\n"
" foo.push_back(123);\n"
" {\n"
" int *it = &foo[0];\n"
" *it = 456;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void pushback3()
{
check("void f()\n"
"{\n"
" std::vector<int>::const_iterator it = foo.begin();\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.push_back(123);\n"
" }\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) After push_back or push_front, the iterator 'it' may be invalid\n", errout.str());
}
void pushback4()
{
check("void f()\n"
"{\n"
" std::vector<int> ints;\n"
" ints.push_back(1);\n"
" int *first = &ints[0];\n"
" ints.push_back(2);\n"
" *first;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Invalid pointer 'first' after push_back / push_front\n", errout.str());
}
void insert1()
{
check("void f(std::vector<int> &ints)\n"
"{\n"
" std::vector<int>::iterator iter = ints.begin() + 5;\n"
" ints.insert(ints.begin(), 1);\n"
" ++iter;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:7]: (error) Invalid iterator 'iter' after insert\n", errout.str());
}
void invalidcode()
{
errout.str("");
const std::string src = "void f()\n"
"{\n"
" for ( \n"
"}\n";
Settings s;
Tokenizer tokenizer(s, this);
std::istringstream istr(src);
ASSERT_EQUALS(false, tokenizer.tokenize(istr, "test.cpp"));
ASSERT_EQUALS("[test.cpp:1]: (error) Invalid number of character ((). Can't process file.\n", errout.str());
}
void stlBoundries1()
{
check("void f()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.begin(); it < ab.end(); ++it)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) STL range check should be using != and not < since the order of the pointers isn't guaranteed\n", errout.str());
check("void f()\n"
"{\n"
" std::vector<int>::iterator it;\n"
" for (it = ab.begin(); it < ab.end(); ++it)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestStl)
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