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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 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 "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(iterator4);
TEST_CASE(iterator5);
TEST_CASE(dereference);
TEST_CASE(dereference_member);
TEST_CASE(STLSize);
TEST_CASE(STLSizeNoErr);
TEST_CASE(erase);
TEST_CASE(erase2);
TEST_CASE(erase3);
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(pushback5);
TEST_CASE(pushback6);
TEST_CASE(pushback7);
TEST_CASE(pushback8);
TEST_CASE(pushback9);
TEST_CASE(insert1);
TEST_CASE(invalidcode);
TEST_CASE(stlBoundries1);
TEST_CASE(stlBoundries2);
TEST_CASE(stlBoundries3);
// if (str.find("ab"))
TEST_CASE(if_find);
// find
TEST_CASE(find1);
TEST_CASE(size1);
}
void check(const std::string &code)
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code.c_str());
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check..
Settings settings;
settings._checkCodingStyle = true;
settings._showAll = true;
CheckStl checkStl;
checkStl.runSimplifiedChecks(&tokenizer, &settings, 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());
}
void iterator4()
{
check("void foo(std::vector<std::string> &test)\n"
"{\n"
" std::set<int> result;\n"
" for (std::vector<std::string>::const_iterator cit = test.begin();\n"
" cit != test.end();\n"
" ++cit)\n"
" {\n"
" result.insert(cit->size());\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void iterator5()
{
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::find(ints1.begin(), ints2.end(), 22);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) mismatching containers\n", errout.str());
}
// Dereferencing invalid pointer
void dereference()
{
check("void f()\n"
"{\n"
" std::vector<int> ints;\n"
" 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:7]: (error) Dereferenced iterator 'iter' has been erased\n", errout.str());
}
void dereference_member()
{
check("void f()\n"
"{\n"
" std::map<int, int> ints;\n"
" std::map<int, int>::iterator iter;\n"
" iter = ints.begin();\n"
" ints.erase(iter);\n"
" std::cout << iter->first << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (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("[test.cpp:6]: (error) When ii==foo.size(), foo[ii] is out of bounds\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector<int> foo;\n"
" foo.push_back(1);\n"
" for (unsigned int ii = 0; ii <= foo.size(); ++ii)\n"
" {\n"
" }\n"
" int ii = 0;\n"
" foo[ii] = 0;\n"
"}\n");
ASSERT_EQUALS("", 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("", 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("", 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("", 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 iterator usage. After erase the iterator is invalid so dereferencing it or comparing it with another iterator is invalid.\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 iterator usage. After erase the iterator is invalid so dereferencing it or comparing it with another iterator is invalid.\n"
"[test.cpp:7]: (error) Dangerous iterator usage. After erase the iterator is invalid so dereferencing it or comparing it with another iterator is invalid.\n", errout.str());
check("void f(std::list<int> &ints)\n"
"{\n"
" std::list<int>::iterator i = ints.begin();\n"
" i = ints.erase(i);\n"
" *i = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void erase2()
{
check("static void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); it = next)\n"
" {\n"
" next = it;\n"
" next++;\n"
" foo.erase(it);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void erase3()
{
check("static void f(std::list<abc> &foo)\n"
"{\n"
" std::list<abc>::iterator it = foo.begin();\n"
" foo.erase(it->a);\n"
" if (it->b);\n"
"}\n");
ASSERT_EQUALS("", 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(const std::vector<int> &foo)\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, 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> foo;\n"
" foo.push_back(10);\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.push_back(123);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) After push_back, 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 pushback5()
{
check("void f()\n"
"{\n"
" std::vector<int>::const_iterator i;\n"
"\n"
" for (i=v.begin(); i!=v.end(); ++i)\n"
" {\n"
" }\n"
"\n"
" for (i=rhs.v.begin(); i!=rhs.v.end(); ++i)\n"
" {\n"
" v.push_back(*i);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void pushback6()
{
// ticket #735
check("void f()\n"
"{\n"
" vector<int> v;\n"
" vector.push_back(1);\n"
" vector.push_back(2);\n"
" for (vector<int>::iterator it = v.begin(); it != v.end(); ++it)\n"
" {\n"
" if (*it == 1)\n"
" v.push_back(10);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) After push_back, the iterator 'it' may be invalid\n", errout.str());
check("void f()\n"
"{\n"
" std::vector<int> v;\n"
" vector.push_back(1);\n"
" vector.push_back(2);\n"
" for (std::vector<int>::iterator it = v.begin(); it != v.end(); ++it)\n"
" {\n"
" if (*it == 1)\n"
" v.push_back(10);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) After push_back, the iterator 'it' may be invalid\n", errout.str());
}
void pushback7()
{
check("void f()\n"
"{\n"
" std::vector<int> foo;\n"
" foo.push_back(10);\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); it++)\n"
" {\n"
" foo.push_back(123);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) After push_back, the iterator 'it' may be invalid\n", errout.str());
}
void pushback8()
{
check("void f()\n"
"{\n"
" std::vector<int> ints;\n"
" std::vector<int>::const_iterator end = ints.end();\n"
" ints.push_back(10);\n"
" std::vector<int>::iterator it;\n"
" unsigned int sum = 0;\n"
" for (it = ints.begin(); it != end; ++it)\n"
" {\n"
" sum += *it;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) After push_back, the iterator 'end' may be invalid\n", errout.str());
}
void pushback9()
{
check("struct A {\n"
" std::vector<int> ints;\n"
"};\n"
"\n"
"void f()\n"
"{\n"
" std::vector<int> ints;\n"
" A a;\n"
" std::vector<int>::const_iterator i = ints.begin();\n"
" std::vector<int>::const_iterator e = ints.end();\n"
" while (i != e)\n"
" {\n"
" a.ints.push_back(*i);\n"
" ++i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", 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");
ASSERT_EQUALS("[test.cpp:5]: (error) After insert, the iterator 'iter' may be invalid\n", errout.str());
check("void f()\n"
"{\n"
" std::vector<int> ints;\n"
" std::vector<int>::iterator iter = ints.begin();\n"
" ints.insert(iter, 1);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" std::vector<int> ints;\n"
" std::vector<int>::iterator iter = ints.begin();\n"
" ints.insert(iter, 1);\n"
" ints.insert(iter, 2);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) After insert, the iterator 'iter' may be invalid\n", errout.str());
}
void invalidcode()
{
errout.str("");
const std::string src = "void f()\n"
"{\n"
" for ( \n"
"}\n";
Tokenizer tokenizer(0, this);
std::istringstream istr(src);
ASSERT_EQUALS(false, tokenizer.tokenize(istr, "test.cpp"));
ASSERT_EQUALS("[test.cpp:3]: (error) Invalid number of character (() when these macros are defined: ''.\n", errout.str());
}
void stlBoundries1()
{
const int STL_CONTAINER_LIST = 9;
const std::string stlCont[STL_CONTAINER_LIST] =
{"deque", "list", "set", "multiset", "map",
"multimap", "hash_map", "hash_multimap", "hash_set"
};
for (int i = 0; i < STL_CONTAINER_LIST; ++i)
{
check("void f()\n"
"{\n"
" std::" + stlCont[i] + "<int>::iterator it;\n"
" for (it = ab.begin(); it < ab.end(); ++it)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) " + stlCont[i] + " range check should use != and not < since the order of the pointers isn't guaranteed\n", errout.str());
}
}
void stlBoundries2()
{
check("void f()\n"
"{\n"
" std::vector<std::string> files;\n"
" std::vector<std::string>::const_iterator it;\n"
" for (it = files.begin(); it < files.end(); it++) { }\n"
" for (it = files.begin(); it < files.end(); it++) { };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void stlBoundries3()
{
check("void f()\n"
"{\n"
" set<int> files;\n"
" set<int>::const_iterator current;\n"
" for (current = files.begin(); current != files.end(); ++current)\n"
" {\n"
" assert(*current < 100)\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void if_find()
{
// ---------------------------
// string::find
// ---------------------------
// error
check("void f(std::string s)\n"
"{\n"
" if (s.find(\"ab\")) { }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (possible style) Suspicious condition. string::find will return 0 if the string is found at position 0. If this is what you want to check then string::compare is a faster alternative because it doesn't scan through the string.\n", errout.str());
// ok
check("void f(std::string s)\n"
"{\n"
" if (s.find(\"ab\") != std::string::npos) { }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// ---------------------------
// set::find
// ---------------------------
// error
check("void f(std::set<int> s)\n"
"{\n"
" if (s.find(12)) { }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Suspicious condition. The result of find is an iterator, but it is not properly checked.\n", errout.str());
// ok
check("void f(std::set<int> s)\n"
"{\n"
" if (s.find(123) != s.end()) { }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// ---------------------------
// std::find
// ---------------------------
// error
check("void f()\n"
"{\n"
" if (std::find(a,b,c)) { }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Suspicious condition. The result of find is an iterator, but it is not properly checked.\n", errout.str());
// ok
check("void f()\n"
"{\n"
" if (std::find(a,b,c) != c) { }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void find1()
{
check("void f(std::vector<int> &ints)\n"
"{\n"
" std::vector<int>::iterator it = std::find(ints.begin(), ints.end(), 33);\n"
" *it = 11;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void size1()
{
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() == 0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible style) Use x.empty() instead of x.size() to guarantee fast code.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() != 0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible style) Use x.empty() instead of x.size() to guarantee fast code.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() > 0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible style) Use x.empty() instead of x.size() to guarantee fast code.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size()) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (possible style) Use x.empty() instead of x.size() to guarantee fast code.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" fun(x.size());\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestStl)
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