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cppcheck/test/teststl.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2013 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(iterator6);
TEST_CASE(iterator7);
TEST_CASE(iterator8);
TEST_CASE(iterator9);
TEST_CASE(iterator10);
TEST_CASE(iterator11);
TEST_CASE(iterator12);
TEST_CASE(iterator13);
TEST_CASE(dereference);
TEST_CASE(dereference_break); // #3644 - handle "break"
TEST_CASE(dereference_member);
TEST_CASE(STLSize);
TEST_CASE(STLSizeNoErr);
TEST_CASE(erase1);
TEST_CASE(erase2);
TEST_CASE(erase3);
TEST_CASE(erase4);
TEST_CASE(erase5);
TEST_CASE(erase6);
TEST_CASE(eraseBreak);
TEST_CASE(eraseContinue);
TEST_CASE(eraseReturn1);
TEST_CASE(eraseReturn2);
TEST_CASE(eraseReturn3);
TEST_CASE(eraseGoto);
TEST_CASE(eraseAssign1);
TEST_CASE(eraseAssign2);
TEST_CASE(eraseAssign3);
TEST_CASE(eraseAssignByFunctionCall);
TEST_CASE(eraseErase);
TEST_CASE(eraseByValue);
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(pushback10);
TEST_CASE(pushback11);
TEST_CASE(pushback12);
TEST_CASE(insert1);
TEST_CASE(insert2);
TEST_CASE(invalidcode);
TEST_CASE(stlBoundaries1);
TEST_CASE(stlBoundaries2);
TEST_CASE(stlBoundaries3);
TEST_CASE(stlBoundaries4); // #4364
TEST_CASE(stlBoundaries5); // #4352
// if (str.find("ab"))
TEST_CASE(if_find);
TEST_CASE(if_str_find);
TEST_CASE(size1);
TEST_CASE(size2);
TEST_CASE(size3);
TEST_CASE(size4); // #2652 - don't warn about vector/deque
// Redundant conditions..
// if (ints.find(123) != ints.end()) ints.remove(123);
TEST_CASE(redundantCondition1);
// missing inner comparison when incrementing iterator inside loop
TEST_CASE(missingInnerComparison1);
TEST_CASE(missingInnerComparison2); // no FP when there is comparison
TEST_CASE(missingInnerComparison3); // no FP when there is iterator shadowing
TEST_CASE(missingInnerComparison4); // no FP when "break;" is used
TEST_CASE(missingInnerComparison5); // Ticket #2154 - FP
TEST_CASE(missingInnerComparison6); // #2643 - 'it=foo.insert(++it,0);'
// catch common problems when using the string::c_str() function
TEST_CASE(cstr);
TEST_CASE(autoPointer);
TEST_CASE(uselessCalls);
TEST_CASE(stabilityOfChecks); // #4684 cppcheck crash in template function call
TEST_CASE(dereferenceInvalidIterator);
}
void check(const char code[], const bool inconclusive=false) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
settings.addEnabled("style");
settings.addEnabled("performance");
settings.inconclusive = inconclusive;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Check..
CheckStl checkStl;
checkStl.runSimplifiedChecks(&tokenizer, &settings, this);
}
void check(const std::string &code, const bool inconclusive=false) {
check(code.c_str(), inconclusive);
}
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"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with different containers 'l1' and 'l2'.\n", errout.str());
// Same check with reverse iterator
check("void f()\n"
"{\n"
" list<int> l1;\n"
" list<int> l2;\n"
" for (list<int>::const_reverse_iterator it = l1.rbegin(); it != l2.rend(); ++it)\n"
" { }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with different containers '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"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Same iterator is used with different containers '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"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Same iterator is used with different containers '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"
"}");
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"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Iterators of different containers are used together.\n", errout.str());
}
void iterator6() {
// Ticket #1357
check("void foo(const std::set<int> &ints1)\n"
"{\n"
" std::set<int> ints2;\n"
" std::set<int>::iterator it1 = ints1.begin();\n"
" std::set<int>::iterator it2 = ints1.end();\n"
" ints2.insert(it1, it2);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const std::set<int> &ints1)\n"
"{\n"
" std::set<int> ints2;\n"
" std::set<int>::iterator it1 = ints1.begin();\n"
" std::set<int>::iterator it2 = ints2.end();\n"
" ints2.insert(it1, it2);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Iterators of different containers are used together.\n", "", errout.str());
}
void iterator7() {
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::inplace_merge(ints1.begin(), std::advance(ints1.rbegin(), 5), ints2.end());\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Iterators of different containers are used together.\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::inplace_merge(ints1.begin(), std::advance(ints2.rbegin(), 5), ints1.end());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void iterator8() {
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::find_first_of(ints1.begin(), ints2.end(), ints1.begin(), ints1.end());\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Iterators of different containers are used together.\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::find_first_of(ints1.begin(), ints1.end(), ints2.begin(), ints1.end());\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Iterators of different containers are used together.\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::find_first_of(foo.bar.begin(), foo.bar.end()-6, ints2.begin(), ints1.end());\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Iterators of different containers are used together.\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector<int> ints1;\n"
" std::vector<int> ints2;\n"
" std::vector<int>::iterator it = std::find_first_of(ints1.begin(), ints1.end(), ints2.begin(), ints2.end());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void iterator9() {
// Ticket #1600
check("void foo(std::vector<int> &r)\n"
"{\n"
" std::vector<int>::iterator aI = r.begin();\n"
" while(aI != r.end())\n"
" {\n"
" if (*aI == 0)\n"
" {\n"
" r.insert(aI, 42);\n"
" return;\n"
" }\n"
" ++aI;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #2481
check("void foo(std::vector<int> &r)\n"
"{\n"
" std::vector<int>::iterator aI = r.begin();\n"
" while(aI != r.end())\n"
" {\n"
" if (*aI == 0)\n"
" {\n"
" r.insert(aI, 42);\n"
" break;\n"
" }\n"
" ++aI;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Execution path checking..
check("void foo(std::vector<int> &r, int c)\n"
"{\n"
" std::vector<int>::iterator aI = r.begin();\n"
" while(aI != r.end())\n"
" {\n"
" if (*aI == 0)\n"
" {\n"
" r.insert(aI, 42);\n"
" if (c)\n"
" {\n"
" return;\n"
" }\n"
" }\n"
" ++aI;\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:14] (error) After insert(), the iterator 'aI' may be invalid.", "", errout.str());
}
void iterator10() {
// Ticket #1679
check("void foo()\n"
"{\n"
" std::set<int> s1;\n"
" std::set<int> s2;\n"
" for (std::set<int>::iterator it = s1.begin(); it != s1.end(); ++it)\n"
" {\n"
" if (true) { }\n"
" if (it != s2.end()) continue;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Same iterator is used with different containers 's1' and 's2'.\n", errout.str());
}
void iterator11() {
// Ticket #3433
check("int main() {\n"
" map<int, int> myMap;\n"
" vector<string> myVector;\n"
" for(vector<int>::iterator x = myVector.begin(); x != myVector.end(); x++)\n"
" myMap.erase(*x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void iterator12() {
// Ticket #3201
check("void f() {\n"
" std::map<int, int> map1;\n"
" std::map<int, int> map2;\n"
" std::map<int, int>::const_iterator it = map1.find(123);\n"
" if (it == map2.end()) { }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with different containers 'map1' and 'map2'.\n", errout.str());
check("void f(std::string &s) {\n"
" int pos = s.find(x);\n"
" s.erase(pos);\n"
" s.erase(pos);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void iterator13() {
check("void f() {\n"
" std::vector<int> a;\n"
" std::vector<int> t;\n"
" std::vector<int>::const_iterator it;\n"
" it = a.begin();\n"
" while (it!=a.end())\n"
" v++it;\n"
" it = t.begin();\n"
" while (it!=a.end())\n"
" ++it;\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Same iterator is used with different containers 't' and 'a'.\n", errout.str());
// #4062
check("void f() {\n"
" std::vector<int> a;\n"
" std::vector<int> t;\n"
" std::vector<int>::const_iterator it;\n"
" it = a.begin();\n"
" while (it!=a.end())\n"
" v++it;\n"
" it = t.begin();\n"
" while (it!=t.end())\n"
" ++it;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" std::vector<int> a;\n"
" std::vector<int> t;\n"
" std::vector<int>::const_iterator it;\n"
" if(z)\n"
" it = a.begin();\n"
" else\n"
" it = t.begin();\n"
" while (z && it!=a.end())\n"
" v++it;\n"
" while (!z && it!=t.end())\n"
" v++it;\n"
"}");
ASSERT_EQUALS("", 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"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:6]: (error) Iterator 'iter' used after element has been erased.\n", errout.str());
}
void dereference_break() { // #3644
check("void f(std::vector<int> &ints) {\n"
" std::vector<int>::iterator iter;\n"
" for (iter=ints.begin();iter!=ints.end();++iter) {\n"
" if (*iter == 2) {\n"
" ints.erase(iter);\n"
" break;\n"
" }\n"
" if (*iter == 3) {\n"
" ints.erase(iter);\n"
" break;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", 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"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:6]: (error) Iterator 'iter' used after element has been erased.\n", errout.str());
// Reverse iterator
check("void f()\n"
"{\n"
" std::map<int, int> ints;\n"
" std::map<int, int>::reverse_iterator iter;\n"
" iter = ints.rbegin();\n"
" ints.erase(iter);\n"
" std::cout << iter->first << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:6]: (error) Iterator 'iter' used after element 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"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) When ii==foo.size(), foo[ii] is out of bounds.\n", errout.str());
check("void foo(std::vector<int> foo) {\n"
" for (unsigned int ii = 0; ii <= foo.size(); ++ii) {\n"
" foo.at(ii) = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) When ii==foo.size(), foo.at(ii) is out of bounds.\n", errout.str());
check("void foo(const std::string& foo) {\n"
" for (unsigned int ii = 0; ii <= foo.length(); ++ii) {\n"
" foo[ii] = 'x';\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) When ii==foo.size(), foo[ii] is out of bounds.\n", errout.str());
check("void foo(const std::string& foo, unsigned int ii) {\n"
" if (ii <= foo.length()) {\n"
" foo[ii] = 'x';\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) When ii==foo.size(), foo[ii] is out of bounds.\n", errout.str());
check("void foo(const std::string& foo, unsigned int ii) {\n"
" if (anything()) {\n"
" } else if (ii <= foo.length()) {\n"
" foo[ii] = 'x';\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (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"
"}");
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"
"}");
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"
"}");
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"
"}");
ASSERT_EQUALS("", errout.str());
}
{
check("void f(const std::map<int,int> &data) {\n"
" int i = x;"
" for (int i = 5; i <= data.size(); i++)\n"
" data[i] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
}
void erase1() {
check("void f()\n"
"{\n"
" for (it = foo.begin(); it != foo.end(); ++it) {\n"
" foo.erase(it);\n"
" }\n"
" for (it = foo.begin(); it != foo.end(); ++it) {\n"
" foo.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (error) Iterator 'it' used after element has been erased.\n"
"[test.cpp:6] -> [test.cpp:7]: (error) Iterator 'it' used after element has been erased.\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"
"}");
ASSERT_EQUALS("", errout.str());
// #2101
check("void f(vector< list<int> > &ints, unsigned int i)\n"
"{\n"
" list<int>::iterator it;\n"
" for(it = ints[i].begin(); it != ints[i].end(); it++) {\n"
" if (*it % 2)\n"
" it = ints[i].erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void erase2() {
check("static void f()\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); it = next)\n"
" {\n"
" next = it;\n"
" next++;\n"
" foo.erase(it);\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"
"}");
ASSERT_EQUALS("", errout.str());
}
void erase4() {
check("void f()\n"
"{\n"
" std::list<int>::iterator it, it2;\n"
" for (it = foo.begin(); it != i2; ++it)\n"
" {\n"
" foo.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:6]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int>::iterator it = foo.begin();\n"
" for (; it != i2; ++it)\n"
" {\n"
" foo.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:6]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int>::iterator it = foo.begin();\n"
" while (it != i2)\n"
" {\n"
" foo.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:6]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int>::iterator it = foo.begin();\n"
" while (it != i2)\n"
" {\n"
" foo.erase(++it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:6]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
}
void erase5() {
check("void f()\n"
"{\n"
" std::list<int> foo;\n"
" std::list<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" if (*it == 123)\n"
" foo.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:8]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
}
void erase6() {
check("void f() {\n"
" std::vector<int> vec(3);\n"
" std::vector<int>::iterator it;\n"
" std::vector<int>::iterator itEnd = vec.end();\n"
" for (it = vec.begin(); it != itEnd; it = vec.begin(), itEnd = vec.end())\n"
" {\n"
" vec.erase(it);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseBreak() {
check("void f()\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" if (x)"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
check("void f()\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" if (x) {\n"
" foo.erase(it);\n"
" break;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x)\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" if (x)"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
}
void eraseContinue() {
check("void f(std::vector<int> &ints)\n"
"{\n"
" std::vector<int>::iterator it;\n"
" std::vector<int>::iterator jt = ints.begin();\n"
" for (it = ints.begin(); it != ints.end(); it = jt) {\n"
" ++jt;\n"
" if (*it == 1) {\n"
" jt = ints.erase(it);\n"
" continue;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseReturn1() {
check("void f()\n"
"{\n"
" std::vector<int> foo;\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseReturn2() {
check("void f()\n"
"{\n"
" std::vector<int> foo;\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" if (*it == 1) {\n"
" foo.erase(it);\n"
" return;\n"
" }\n"
" else {\n"
" foo.erase(it);\n"
" return;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseReturn3() {
check("void f()\n"
"{\n"
" std::vector<int> foo;\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" if (somecondition) {\n"
" if (*it == 1)\n"
" foo.erase(it);\n"
" else\n"
" *it = 0;\n"
" return;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" std::vector<int> foo;\n"
" std::vector<int>::iterator it;\n"
" for (it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" if (a) {\n"
" if (b)\n"
" foo.erase(it);\n"
" else\n"
" *it = 0;\n"
" }\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Dangerous iterator usage after erase()-method.\n", "", errout.str());
}
void eraseGoto() {
check("void f()\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" goto abc;\n"
" }\n"
"bar:\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseAssign1() {
check("void f()\n"
"{\n"
" for (iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(it);\n"
" it = foo.begin();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseAssign2() {
check("void f(list<int> &ints)\n"
"{\n"
" for (list<int>::iterator it = ints.begin(); it != ints.end();) {\n"
" if (*it == 123) {\n"
" list<int>::iterator copy = it;\n"
" ++copy;\n"
" ints.erase(it);\n"
" it = copy;\n"
" } else {\n"
" it->second = 123;\n"
" ++it;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseAssign3() {
check("void f(std::list<list<int> >& l) {\n"
" std::list<std::list<int> >::const_iterator i = l.begin();\n"
" std::list<int>::const_iterator j = (*i).begin();\n"
" cout << *j << endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void eraseAssignByFunctionCall() {
check("void f(std::list<list<int> >& l) {\n"
" std::list<foo>::const_iterator i;\n"
" bar(i);\n"
" cout << *i;\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"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Invalid iterator: iter\n", errout.str());
}
void eraseByValue() {
check("void f()\n"
"{\n"
" std::set<int> foo;\n"
" for (std::set<int>::iterator it = foo.begin(); it != foo.end(); ++it)\n"
" {\n"
" foo.erase(*it);\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Iterator 'it' becomes invalid when deleted by value from 'foo'\n", "", errout.str());
check("int f(std::set<int> foo) {\n"
" std::set<int>::iterator it = foo.begin();\n"
" foo.erase(*it);\n"
" return *it;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (error) Iterator 'it' used after element has been erased.\n", errout.str());
check("void f()\n"
"{\n"
" std::set<int> foo;\n"
" std::set<int>::iterator it = foo.begin();\n"
" foo.erase(*it);\n"
"}");
ASSERT_EQUALS("", 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"
"}");
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"
"}");
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"
"}");
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"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Invalid pointer 'first' after push_back().\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"
"}");
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"
"}");
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"
"}");
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"
"}");
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"
"}");
ASSERT_EQUALS("", errout.str());
}
void pushback10() {
check("void f(std::vector<int> &foo)\n"
"{\n"
" std::vector<int>::const_iterator it = foo.begin();\n"
" foo.reserve(100);\n"
" *it = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) After reserve(), the iterator 'it' may be invalid.\n", errout.str());
// in loop
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.reserve(123);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) After reserve(), the iterator 'it' may be invalid.\n", errout.str());
}
void pushback11() {
// #2798
check("void f() {\n"
" std::vector<int> ints;\n"
" std::vector<int>::iterator it = ints.begin();\n"
" if (it == ints.begin()) {\n"
" ints.push_back(0);\n"
" } else {\n"
" ints.insert(it,0);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void pushback12() {
// #4197
check("void foo(double s)\n"
"{\n"
" std::vector<double> vec;\n"
" for( std::vector<double>::iterator it = vec.begin(); it != vec.end(); ++it )\n"
" {\n"
" vec.insert( it, s );\n"
" for(unsigned int i = 0; i < 42; i++)\n"
" {}\n"
" *it;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) After insert(), the iterator 'it' may be invalid.\n"
"[test.cpp:9]: (error) After insert(), the iterator 'it' may be invalid.\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"
"}");
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"
"}");
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"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) After insert(), the iterator 'iter' may be invalid.\n", errout.str());
check("void* f(const std::vector<Bar>& bars) {\n"
" std::vector<Bar>::iterator i = bars.begin();\n"
" bars.insert(Bar());\n"
" void* v = &i->foo;\n"
" return v;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) After insert(), the iterator 'i' may be invalid.\n", errout.str());
check("Foo f(const std::vector<Bar>& bars) {\n"
" std::vector<Bar>::iterator i = bars.begin();\n"
" bars.insert(Bar());\n"
" return i->foo;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) After insert(), the iterator 'i' may be invalid.\n", errout.str());
check("void f(const std::vector<Bar>& bars) {\n"
" for(std::vector<Bar>::iterator i = bars.begin(); i != bars.end(); ++i) {\n"
" i = bars.insert(i, bar);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::vector<Bar>& bars) {\n"
" for(std::vector<Bar>::iterator i = bars.begin(); i != bars.end(); ++i) {\n"
" bars.insert(i, bar);\n"
" i = bars.insert(i, bar);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) After insert(), the iterator 'i' may be invalid.\n"
"[test.cpp:4]: (error) After insert(), the iterator 'i' may be invalid.\n", errout.str());
check("void* f(const std::vector<Bar>& bars) {\n"
" std::vector<Bar>::iterator i = bars.begin();\n"
" bars.insert(i, Bar());\n"
" i = bars.insert(i, Bar());\n"
" void* v = &i->foo;\n"
" return v;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) After insert(), the iterator 'i' may be invalid.\n", errout.str());
}
void insert2() {
// Ticket: #2169
check("void f(std::vector<int> &vec) {\n"
" for(std::vector<int>::iterator iter = vec.begin(); iter != vec.end(); ++iter)\n"
" {\n"
" vec.insert(iter, 0);\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int> &vec) {\n"
" for(std::vector<int>::iterator iter = vec.begin(); iter != vec.end(); ++iter)\n"
" {\n"
" if (*it == 0) {\n"
" vec.insert(iter, 0);\n"
" return;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void invalidcode() {
errout.str("");
const std::string src = "void f()\n"
"{\n"
" for (\n"
"}\n";
Settings settings;
Tokenizer tokenizer(&settings, 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 stlBoundaries1() {
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"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Dangerous iterator comparison using operator< on 'std::" + stlCont[i] + "'.\n", errout.str());
}
check("void f() {\n"
" std::forward_list<int>::iterator it;\n"
" for (it = ab.begin(); ab.end() > it; ++it) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous iterator comparison using operator< on 'std::forward_list'.\n", errout.str());
}
void stlBoundaries2() {
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"
"}");
ASSERT_EQUALS("", errout.str());
}
void stlBoundaries3() {
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"
"}");
ASSERT_EQUALS("", errout.str());
check("bool f() {\n"
" static set<Foo>::const_iterator current;\n"
" return 25 > current->bar;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Invalid iterator 'current' used.\n", errout.str());
}
void stlBoundaries4() {
check("void f() {\n"
" std::forward_list<std::vector<std::vector<int>>>::iterator it;\n"
" for (it = ab.begin(); ab.end() > it; ++it) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous iterator comparison using operator< on 'std::forward_list'.\n", errout.str());
// don't crash
check("void f() {\n"
" if (list < 0) ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" if (list < 0) {\n"
" std::forward_list<std::vector<std::vector<int>>>::iterator it;\n"
" for (it = ab.begin(); ab.end() > it; ++it) {}\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Dangerous iterator comparison using operator< on 'std::forward_list'.\n", errout.str());
}
void stlBoundaries5() {
check("class iterator { int foo(); };\n"
"int foo() {\n"
" iterator i;\n"
" return i.foo();;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class iterator {\n"
" Class operator*();\n"
" iterator& operator++();\n"
" int foo();\n"
"};\n"
"int foo() {\n"
" iterator i;\n"
" return i.foo();;\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Invalid iterator 'i' used.\n", errout.str());
}
void if_find() {
// ---------------------------
// set::find
// ---------------------------
// error (simple)
check("void f(std::set<int> s)\n"
"{\n"
" if (s.find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// error (pointer)
check("void f(std::set<int> *s)\n"
"{\n"
" if (*s.find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// error (array-like pointer)
check("void f(std::set<int> *s)\n"
"{\n"
" if (s[0].find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// error (array)
check("void f(std::set<int> s [10])\n"
"{\n"
" if (s[0].find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// error (undefined length array)
check("void f(std::set<int> s [])\n"
"{\n"
" if (s[0].find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// error (vector)
check("void f(std::vector<std::set<int> > s)\n"
"{\n"
" if (s[0].find(12)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Suspicious condition. The result of find() is an iterator, but it is not properly checked.\n", errout.str());
// ok (simple)
check("void f(std::set<int> s)\n"
"{\n"
" if (s.find(123) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ok (pointer)
check("void f(std::set<int> *s)\n"
"{\n"
" if (*s.find(12) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ok (array-like pointer)
check("void f(std::set<int> *s)\n"
"{\n"
" if (s[0].find(12) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ok (array)
check("void f(std::set<int> s [10])\n"
"{\n"
" if (s[0].find(123) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ok (undefined length array)
check("void f(std::set<int> s [])\n"
"{\n"
" if (s[0].find(123) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ok (vector)
check("void f(std::vector<std::set<int> > s)\n"
"{\n"
" if (s[0].find(123) != s.end()) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ---------------------------
// std::find
// ---------------------------
// error
check("void f()\n"
"{\n"
" if (std::find(a,b,c)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) 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"
"}");
ASSERT_EQUALS("", errout.str());
// #3714 - segmentation fault for syntax error
check("void f() {\n"
" if (()) { }\n"
"}");
// #3865
check("void f() {\n"
" if ((std::find(a,b,c)) != b) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void if_str_find() {
// error (simple)
check("void f(const std::string &s)\n"
"{\n"
" if (s.find(\"abc\")) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Inefficient usage of string::find() in condition; string::compare() would be faster.\n", errout.str());
// error (pointer)
check("void f(const std::string *s)\n"
"{\n"
" if (*s.find(\"abc\")) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Inefficient usage of string::find() in condition; string::compare() would be faster.\n", errout.str());
// error (vector)
check("void f(const std::vector<std::string> &s)\n"
"{\n"
" if (s[0].find(\"abc\")) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Inefficient usage of string::find() in condition; string::compare() would be faster.\n", errout.str());
// #3162
check("void f(const std::string& s1, const std::string& s2)\n"
"{\n"
" if ((!s1.empty()) && (0 == s1.find(s2))) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Inefficient usage of string::find() in condition; string::compare() would be faster.\n", errout.str());
// #4102
check("void f(const std::string &define) {\n"
" if (define.find(\"=\") + 1U == define.size());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::string a, std::string b) {\n" // #4480
" if (a.find(\"<\") < b.find(\">\")) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void size1() {
check("struct Fred {\n"
" void foo();\n"
" std::list<int> x;\n"
"};\n"
"void Fred::foo()\n"
"{\n"
" if (x.size() == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("std::list<int> x;\n"
"void f()\n"
"{\n"
" if (x.size() == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (0 == x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (0 != x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() > 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (0 < x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() >= 1) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size() < 1) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (1 <= x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (1 > x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" if (!x.size()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" fun(x.size());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" fun(!x.size());\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f()\n"
"{\n"
" std::list<int> x;\n"
" fun(a && x.size());\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("void f() {\n" // #4039
" std::list<int> x;\n"
" fun(width % x.size() != 0);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #4584
check("void f() {\n"
" std::list<int> x;\n"
" if (foo + 1 > x.size()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" std::list<int> x;\n"
" if (x.size() < 1 + foo) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void size2() {
check("struct Fred {\n"
" std::list<int> x;\n"
"};\n"
"struct Wilma {\n"
" Fred f;\n"
" void foo();\n"
"};\n"
"void Wilma::foo()\n"
"{\n"
" if (f.x.size() == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
}
void size3() {
check("namespace N {\n"
" class Zzz {\n"
" public:\n"
" std::list<int> x;\n"
" };\n"
"}\n"
"using namespace N;\n"
"Zzz * zzz;\n"
"int main() {\n"
" if (zzz->x.size() > 0) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
check("namespace N {\n"
" class Zzz {\n"
" public:\n"
" std::list<int> x;\n"
" };\n"
"}\n"
"using namespace N;\n"
"int main() {\n"
" Zzz * zzz;\n"
" if (zzz->x.size() > 0) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (performance) Possible inefficient checking for 'x' emptiness.\n", errout.str());
}
void size4() { // #2652 - don't warn about vector/deque
check("void f(std::vector<int> &v) {\n"
" if (v.size() > 0U) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::deque<int> &v) {\n"
" if (v.size() > 0U) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantCondition1() {
check("void f(string haystack)\n"
"{\n"
" if (haystack.find(needle) != haystack.end())\n"
" haystack.remove(needle);"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant checking of STL container element existence before removing it.\n", errout.str());
}
void missingInnerComparison1() {
check("void f(std::set<int> &ints) {\n"
" for (std::set<int>::iterator it = ints.begin(); it != ints.end(); ++it) {\n"
" if (a) {\n"
" it++;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (warning) Missing bounds check for extra iterator increment in loop.\n", errout.str());
check("void f(std::map<int,int> &ints) {\n"
" for (std::map<int,int>::iterator it = ints.begin(); it != ints.end(); ++it) {\n"
" ++it->second;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingInnerComparison2() {
check("void f(std::set<int> &ints) {\n"
" for (std::set<int>::iterator it = ints.begin(); it != ints.end(); ++it) {\n"
" if (a) {\n"
" it++;\n"
" if (it == ints.end())\n"
" return;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingInnerComparison3() {
check("void f(std::set<int> &ints) {\n"
" for (std::set<int>::iterator it = ints.begin(); it != ints.end(); ++it) {\n"
" for (std::set<int>::iterator it = ints2.begin(); it != ints2.end(); ++it)\n"
" { }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingInnerComparison4() {
check("function f1(std::list<int> &l1) {\n"
" for(std::list<int>::iterator i = l1.begin(); i != l1.end(); i++) {\n"
" if (*i == 44) {\n"
" l1.insert(++i, 55);\n"
" break;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("function f1(std::list<int> &l1) {\n"
" for(std::list<int>::iterator i = l1.begin(); i != l1.end(); i++) {\n"
" if (*i == 44) {\n"
" l1.insert(++i, 55);\n"
" return;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingInnerComparison5() {
check("void f() {\n"
" for(it = map1.begin(); it != map1.end(); it++) {\n"
" str[i++] = (*it).first;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void missingInnerComparison6() {
check("void f(std::string &s) {\n"
" for(string::iterator it = s.begin(); it != s.end(); it++) {\n"
" it = s.insert(++it, 0);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void cstr() {
check("void f() {\n"
" std::string errmsg;\n"
" throw errmsg.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after throwing exception.\n", errout.str());
check("const char *get_msg() {\n"
" std::string errmsg;\n"
" return errmsg.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("const char *get_msg() {\n"
" std::ostringstream errmsg;\n"
" return errmsg.str().c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("const char *get_msg() {\n"
" std::string errmsg;\n"
" return std::string(\"ERROR: \" + errmsg).c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("const char *get_msg() {\n"
" std::string errmsg;\n"
" return (\"ERROR: \" + errmsg).c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("const char *get_msg() {\n"
" std::string errmsg;\n"
" return (\"ERROR: \" + std::string(\"crash me\")).c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("void f() {\n"
" std::ostringstream errmsg;\n"
" const char *c = errmsg.str().c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("std::string f();\n"
"\n"
"void foo() {\n"
" const char *c = f().c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("class Foo {\n"
" const char *f();\n"
"};\n"
"const char *Foo::f() {\n"
" std::string s;\n"
" return s.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("const char* foo() {\n"
" static std::string text;\n"
" text = \"hello world\n\";\n"
" return text.c_str();\n"
"}");
ASSERT_EQUALS("", errout.str()); // #3427
// Implicit conversion back to std::string
check("std::string get_msg() {\n"
" std::string errmsg;\n"
" return errmsg.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Returning the result of c_str() in a function that returns std::string is slow and redundant.\n", errout.str());
check("const std::string& get_msg() {\n"
" std::string errmsg;\n"
" return errmsg.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance) Returning the result of c_str() in a function that returns std::string is slow and redundant.\n", errout.str());
check("std::string get_msg() {\n"
" std::string errmsg;\n"
" return errmsg;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string get_msg() {\n" // #3678
" MyStringClass errmsg;\n"
" return errmsg.c_str();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void Foo1(const std::string& str) {}\n"
"void Foo2(char* c, const std::string str) {}\n"
"void Foo3(std::string& rstr) {}\n"
"void Foo4(std::string str, const std::string& str) {}\n"
"void Bar() {\n"
" std::string str = \"bar\";\n"
" Foo1(str);\n"
" Foo1(str.c_str());\n"
" Foo2(str.c_str(), str);\n"
" Foo2(str.c_str(), str.c_str());\n"
" Foo3(str.c_str());\n"
" Foo4(str, str);\n"
" Foo4(str.c_str(), str);\n"
" Foo4(str, str.c_str());\n"
" Foo4(str.c_str(), str.c_str());\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 1 is slow and redundant.\n"
"[test.cpp:10]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 2 is slow and redundant.\n"
"[test.cpp:13]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 1 is slow and redundant.\n"
"[test.cpp:14]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 2 is slow and redundant.\n"
"[test.cpp:15]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 1 is slow and redundant.\n"
"[test.cpp:15]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 2 is slow and redundant.\n", errout.str());
check("void Foo1(const std::string& str) {}\n"
"void Foo2(char* c, const std::string str) {}\n"
"void Bar() {\n"
" std::string str = \"bar\";\n"
" Foo1(str, foo);\n" // Don't crash
" Foo2(str.c_str());\n" // Don't crash
"}");
ASSERT_EQUALS("", errout.str());
check("struct Foo {\n"
" void func(std::string str) const {}\n"
" static void sfunc(std::string str) {}\n"
"};\n"
"void func(std::string str) {}\n"
"void Bar() {\n"
" std::string str = \"bar\";\n"
" Foo foo;\n"
" func(str.c_str());\n"
" Foo::sfunc(str.c_str());\n"
" foo.func(str.c_str());\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:9]: (performance) Passing the result of c_str() to a function that takes std::string as argument 1 is slow and redundant.\n"
"[test.cpp:10]: (performance) Passing the result of c_str() to a function that takes std::string as argument 1 is slow and redundant.\n",
"", errout.str());
check("void svgFile(const std::string &content, const std::string &fileName, const double end = 1000., const double start = 0.);\n"
"void Bar(std::string filename) {\n"
" std::string str = \"bar\";\n"
" std::ofstream svgFile(filename.c_str(), std::ios::trunc);\n"
" svgFile << \"test\";\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void Foo(const char* p) {}\n"
"void Foo(const std::string& str) {Foo(str.c_str());}\n" // Overloaded
"void Bar() {\n"
" std::string str = \"bar\";\n"
" Foo(str);\n"
" Foo(str.c_str());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int atoi(const std::string& str) {\n" // #3729: Don't suggest recursive call
" return atoi(str.c_str());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"\n"
"const char *f()\n"
"{\n"
" return hello().c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
check("class Fred {\n"
" std::string hello();\n"
" const char *f();\n"
"};\n"
"std::string Fred::hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"const char *Fred::f()\n"
"{\n"
" return hello().c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:11]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
// #4183 - using MyStringClass.c_str()
check("void a(const std::string &str);\n"
"\n"
"void b() {\n"
" MyStringClass s;\n"
" a(s.c_str());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void autoPointer() {
// ticket 2846
check("void f()\n"
"{\n"
" std::vector<int*> vec;\n"
" vec.push_back(new int(3));\n"
" std::auto_ptr<int> ret(vec[0]);\n"
"};");
ASSERT_EQUALS("", errout.str());
// ticket 2839
check("template <class MUTEX_TYPE>\n"
"class Guarded\n"
"{\n"
" typedef std::auto_ptr<MUTEX_TYPE > WriteGuardType;\n"
" virtual WriteGuardType getWriteGuard(bool enabledGuard = true);\n"
"};\n"
"class SafeSharedMemory : public Guarded<int>\n"
"{\n"
"};");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" auto_ptr< ns1:::MyClass > y;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2;\n"
" p2 = new T;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::vector< std::auto_ptr< ns1::MyClass> > v;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) You can randomly lose access to pointers if you store 'auto_ptr' pointers in an STL container.\n", errout.str());
check("void foo()\n"
"{\n"
" std::vector< auto_ptr< MyClass> > v;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) You can randomly lose access to pointers if you store 'auto_ptr' pointers in an STL container.\n", errout.str());
check("void foo()\n"
"{\n"
" int *i = new int;\n"
" auto_ptr<int> x(i);\n"
" auto_ptr<int> y;\n"
" y = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Copying 'auto_ptr' pointer to another does not create two equal objects since one has lost its ownership of the pointer.\n", errout.str());
check("std::auto_ptr<A> function();\n"
"int quit;"
"void f() { quit = true; }\n"
);
ASSERT_EQUALS("", errout.str());
// ticket #748
check("void f()\n"
"{\n"
" T* var = new T[10];\n"
" auto_ptr<T> p2( var );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" foo::bar::baz* var = new foo::bar::baz[10];\n"
" auto_ptr<foo::bar::baz> p2( var );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2( new T[] );\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2( new T[5] );\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<foo::bar> p(new foo::bar[10]);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2;\n"
" p2.reset( new T[] );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2( new T[][] );\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2;\n"
" p2 = new T[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T::B> p2;\n"
" p2 = new T::B[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T> p2;\n"
" p2.reset( new T[10] );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
check("void f()\n"
"{\n"
" auto_ptr<T::B> p2;\n"
" p2.reset( new T::B[10] );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with operator 'new[]'.\n", errout.str());
// ticket #2887 (infinite loop)
check("A::A(std::auto_ptr<X> e){}");
ASSERT_EQUALS("", errout.str());
// ticket #2967 (segmentation fault)
check("auto_ptr<x>\n");
ASSERT_EQUALS("", errout.str());
// ticket #4390
check("auto_ptr<ConnectionStringReadStorage> CreateRegistryStringStorage() {\n"
" return auto_ptr<ConnectionStringReadStorage>(new RegistryConnectionStringStorage());\n"
"}\n"
"\n"
"void LookupWindowsUserAccountName() {\n"
" auto_ptr_array<char> domainName(new char[42]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uselessCalls() {
check("void f()\n"
"{\n"
" string s1, s2;\n"
" s1.swap(s2);\n"
" s2.swap(s2);\n"
"};");
ASSERT_EQUALS("[test.cpp:5]: (performance) It is inefficient to swap a object with itself by calling 's2.swap(s2)'\n", errout.str());
check("void f()\n"
"{\n"
" string s1, s2;\n"
" s1.compare(s2);\n"
" s2.compare(s2);\n"
" s1.compare(s2.c_str());\n"
" s1.compare(0, s1.size(), s1);\n"
"};");
ASSERT_EQUALS("[test.cpp:5]: (warning) It is inefficient to call 's2.compare(s2)' as it always returns 0.\n", errout.str());
check("void f()\n"
"{\n"
" int x=1;\n"
" string s1, s2;\n"
" s1 = s1.substr();\n"
" s2 = s1.substr(x);\n"
" s1 = s2.substr(0, x);\n"
" s1 = s2.substr(0,std::string::npos);\n"
" s1 = s2.substr(x+5-n, 0);\n"
"};");
ASSERT_EQUALS("[test.cpp:5]: (performance) Ineffective call of function \'substr\' because it returns a copy of "
"the object. Use operator= instead.\n"
"[test.cpp:8]: (performance) Ineffective call of function \'substr\' because it returns a copy of "
"the object. Use operator= instead.\n"
"[test.cpp:9]: (performance) Ineffective call of function \'substr\' because it returns an empty string.\n", errout.str());
check("int main()\n"
"{\n"
" std::string str = \"a1b1\";\n"
" return str.find(str[1], 2);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool foo(std::vector<int>& v) {\n"
" v.empty();\n"
" return v.empty();\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Ineffective call of function 'empty()'. Did you intend to call 'clear()' instead?\n", errout.str());
check("void f() {\n" // #4032
" const std::string greeting(\"Hello World !!!\");\n"
" const std::string::size_type npos = greeting.rfind(\" \");\n"
" if (npos != std::string::npos)\n"
" std::cout << greeting.substr(0, npos) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" std::remove(a.begin(), a.end(), val);\n"
" std::remove_if(a.begin(), a.end(), val);\n"
" std::unique(a.begin(), a.end(), val);\n"
" x = std::remove(a.begin(), a.end(), val);\n"
" a.erase(std::remove(a.begin(), a.end(), val));\n"
" std::remove(\"foo.txt\");\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Return value of std::remove() ignored. Elements remain in container.\n"
"[test.cpp:3]: (warning) Return value of std::remove_if() ignored. Elements remain in container.\n"
"[test.cpp:4]: (warning) Return value of std::unique() ignored. Elements remain in container.\n", errout.str());
// #4431 - fp
check("bool f() {\n"
" return x ? true : (y.empty());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void stabilityOfChecks() {
// Stability test: 4684 cppcheck crash in template function call.
check("template<class T>\n"
"class EffectivityRangeData {};\n"
"template<class T>\n"
"class EffectivityRange {\n"
" void unite() {\n"
" x < vector < EffectivityRangeData<int >> >();\n"
" EffectivityRange<int> er;\n"
" }\n"
" void shift() { EffectivityRangeData<int>::iterator it; } \n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void dereferenceInvalidIterator() {
// Test simplest "if" with && case
check("void foo(std::string::iterator& i) {\n"
" if (std::isalpha(*i) && i != str.end()) {\n"
" std::cout << *i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test suggested correction doesn't report an error
check("void foo(std::string::iterator& i) {\n"
" if (i != str.end() && std::isalpha(*i)) {\n"
" std::cout << *i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Test "while" with "&&" case
check("void foo(std::string::iterator& i) {\n"
" while (std::isalpha(*i) && i != str.end()) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test "while" with "||" case
check("void foo(std::string::iterator& i) {\n"
" while (!(!std::isalpha(*i) || i == str.end())) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test fix for "while" with "||" case
check("void foo(std::string::iterator& i) {\n"
" while (!(i == str.end() || !std::isalpha(*i))) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Test "for" with "&&" case
check("void foo(std::string::iterator& i) {\n"
" for (; std::isalpha(*i) && i != str.end() ;) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test "for" with "||" case
check("void foo(std::string::iterator& i) {\n"
" for (; std::isalpha(*i) || i == str.end() ;) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test that a dereference outside the condition part of a "for"
// loop does not result in a false positive
check("void foo(std::string::iterator& i) {\n"
" for (char c = *i; isRunning && i != str.end() ;) {\n"
" std::cout << c;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Test that other "&&" terms in the condition don't invalidate the check
check("void foo(char* c, std::string::iterator& i) {\n"
" if (*c && std::isalpha(*i) && i != str.end()) {\n"
" std::cout << *i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test that dereference of different variable doesn't trigger a false positive
check("void foo(const char* c, std::string::iterator& i) {\n"
" if (std::isalpha(*c) && i != str.end()) {\n"
" std::cout << *c;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Test case involving "rend()" instead of "end()"
check("void foo(std::string::iterator& i) {\n"
" while (std::isalpha(*i) && i != str.rend()) {\n"
" std::cout << *i;\n"
" i ++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Possible dereference of an invalid iterator: i\n", errout.str());
// Test that mixed "&&" and "||" don't result in a false positive
check("void foo(std::string::iterator& i) {\n"
" if ((i == str.end() || *i) || (isFoo() && i != str.end())) {\n"
" std::cout << \"foo\";\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestStl)
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