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CheckStl: Use AST to handle iterator comparisons better

This commit is contained in:
Daniel Marjamäki 2017-07-26 23:13:01 +02:00
parent a3916c501c
commit eb288ec2a1
2 changed files with 27 additions and 4 deletions
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12
lib/checkstl.cpp
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@ -140,9 +140,15 @@ void CheckStl::iterators()
validIterator = true;
// Is iterator compared against different container?
if (Token::Match(tok2, "%varid% !=|== %name% . end|rend|cend|crend ( )", iteratorId) && container && tok2->tokAt(2)->varId() != container->declarationId()) {
iteratorsError(tok2, container->name(), tok2->strAt(2));
tok2 = tok2->tokAt(6);
if (tok2->isComparisonOp() && container) {
const Token *other = nullptr;
if (tok2->astOperand1()->varId() == iteratorId)
other = tok2->astOperand2()->tokAt(-3);
else if (tok2->astOperand2()->varId() == iteratorId)
other = tok2->astOperand1()->tokAt(-3);
if (Token::Match(other, "%name% . end|rend|cend|crend ( )") && other->varId() != container->declarationId())
iteratorsError(tok2, container->name(), other->str());
}
// Is the iterator used in a insert/erase operation?

19
test/teststl.cpp
View File

@ -172,6 +172,15 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with different containers 'l1' and 'l2'.\n", errout.str());
check("void f()\n"
"{\n"
" list<int> l1;\n"
" list<int> l2;\n"
" for (list<int>::iterator it = l1.begin(); l2.end() != it; ++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"
@ -442,6 +451,14 @@ private:
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Same iterator is used with different containers 'map1' and 'map2'.\n", errout.str());
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 (map2.end() == it) { }"
"}");
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"
@ -457,7 +474,7 @@ private:
" std::vector<int>::const_iterator it;\n"
" it = a.begin();\n"
" while (it!=a.end())\n"
" v++it;\n"
" ++it;\n"
" it = t.begin();\n"
" while (it!=a.end())\n"
" ++it;\n"