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Fix c_strParam regression (#4393) 

* Fix #7515 New check: Not needed c_str() operation

* Comment

* Detect more instances of c_str() misuse

* Fix bad merge

* Check for data() also

* Fix

* Format

* Format

* Fix c_strParam regression
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chrchr-github 2022-08-23 15:00:27 +02:00 committed by GitHub
parent 5d267000e2
commit 4be7f689d7
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2 changed files with 6 additions and 1 deletions
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2
lib/checkstl.cpp
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@ -1939,6 +1939,8 @@ void CheckStl::string_c_str()
auto isString = [](const Token* str) -> bool {
if (Token::Match(str, "(|[") && !(str->valueType() && str->valueType()->type == ValueType::ITERATOR))
str = str->previous();
else if (Token::simpleMatch(str, "."))
str = str->astOperand2();
return str && ((str->variable() && str->variable()->isStlStringType()) || // variable
(str->function() && isStlStringType(str->function()->retDef)) || // function returning string
(str->valueType() && str->valueType()->type == ValueType::ITERATOR && isStlStringType(str->valueType()->containerTypeToken))); // iterator pointing to string

5
test/teststl.cpp
View File

@ -3898,6 +3898,7 @@ private:
"struct T {\n"
" std::string g();\n"
" std::string a[1];\n"
" struct U { std::string s; } u;"
"};\n"
"void g(const std::vector<std::string>& v, T& t) {\n"
" for (std::vector<std::string>::const_iterator it = v.begin(); it != v.end(); ++it)\n"
@ -3905,11 +3906,13 @@ private:
" f(v.begin()->c_str());\n"
" f(t.g().c_str());\n"
" f(t.a[0].c_str());\n"
" f(t.u.s.c_str());\n"
"}\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:9]: (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. 1 is slow and redundant.\n"
"[test.cpp:11]: (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:11]: (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:12]: (performance) Passing the result of c_str() to a function that takes std::string as argument no. 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"