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Fix FN stlcstrAssignment (#4764)

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chrchr-github 2023-02-03 14:10:27 +01:00 committed by GitHub
parent e8c3a80678
commit 5818520b4b
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2 changed files with 16 additions and 2 deletions
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5
lib/checkstl.cpp
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@ -1976,8 +1976,9 @@ void CheckStl::string_c_str()
const Variable* var = tok->variable();
if (var->isPointer())
string_c_strError(tok);
} else if (printPerformance && Token::Match(tok->tokAt(2), "%var% . c_str|data ( ) ;")) {
if (tok->variable() && tok->variable()->isStlStringType() && tok->tokAt(2)->variable() && tok->tokAt(2)->variable()->isStlStringType())
} else if (printPerformance && tok->tokAt(1)->astOperand2() && Token::Match(tok->tokAt(1)->astOperand2()->tokAt(-3), "%var% . c_str|data ( ) ;")) {
const Token* vartok = tok->tokAt(1)->astOperand2()->tokAt(-3);
if (tok->variable() && tok->variable()->isStlStringType() && vartok->variable() && vartok->variable()->isStlStringType())
string_c_strAssignment(tok);
}
} else if (printPerformance && tok->function() && Token::Match(tok, "%name% ( !!)") && tok->str() != scope.className) {

13
test/teststl.cpp
View File

@ -4142,6 +4142,19 @@ private:
"[test.cpp:12]: (performance) Passing the result of c_str() to a stream is slow and redundant.\n"
"[test.cpp:14]: (performance) Passing the result of c_str() to a stream is slow and redundant.\n",
errout.str());
check("struct S { std::string str; };\n"
"struct T { S s; };\n"
"struct U { T t[1]; };\n"
"void f(const T& t, const U& u, std::string& str) {\n"
" if (str.empty())\n"
" str = t.s.str.c_str();\n"
" else\n"
" str = u.t[0].s.str.c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (performance) Assigning the result of c_str() to a std::string is slow and redundant.\n"
"[test.cpp:8]: (performance) Assigning the result of c_str() to a std::string is slow and redundant.\n",
errout.str());
}
void uselessCalls() {