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Fixed #5677 (Fix overzealous substr() warning)

This commit is contained in:
Mark de Wever 2014-04-13 19:04:35 +02:00 committed by Daniel Marjamäki
parent dbf2c44a81
commit b4b340b7be
2 changed files with 23 additions and 6 deletions
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15
lib/checkstl.cpp
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@ -1371,6 +1371,10 @@ void CheckStl::autoPointerArrayError(const Token *tok)
void CheckStl::uselessCalls()
{
// THIS ARRAY MUST BE ORDERED ALPHABETICALLY
static const char* const stl_string[] = {
"string", "u16string", "u32string", "wstring"
};
// THIS ARRAY MUST BE ORDERED ALPHABETICALLY
static const char* const stl_containers_with_empty_and_clear[] = {
"deque", "forward_list", "list",
@ -1395,13 +1399,14 @@ void CheckStl::uselessCalls()
} else if (tok->varId() && Token::Match(tok, "%var% . swap ( %var% )") &&
tok->varId() == tok->tokAt(4)->varId() && performance) {
uselessCallsSwapError(tok, tok->str());
} else if (Token::simpleMatch(tok, ". substr (") && performance) {
if (Token::Match(tok->tokAt(3), "0| )"))
} else if (Token::Match(tok, "%var% . substr (") && performance &&
tok->variable() && tok->variable()->isStlType(stl_string)) {
if (Token::Match(tok->tokAt(4), "0| )"))
uselessCallsSubstrError(tok, false);
else if (tok->strAt(3) == "0" && tok->linkAt(2)->strAt(-1) == "npos") {
if (!tok->linkAt(2)->previous()->variable()) // Make sure that its no variable
else if (tok->strAt(4) == "0" && tok->linkAt(3)->strAt(-1) == "npos") {
if (!tok->linkAt(3)->previous()->variable()) // Make sure that its no variable
uselessCallsSubstrError(tok, false);
} else if (Token::simpleMatch(tok->linkAt(2)->tokAt(-2), ", 0 )"))
} else if (Token::simpleMatch(tok->linkAt(3)->tokAt(-2), ", 0 )"))
uselessCallsSubstrError(tok, true);
} else if (Token::Match(tok, "[{};] %var% . empty ( ) ;") && warning &&
tok->next()->variable() && tok->next()->variable()->isStlType(stl_containers_with_empty_and_clear))

14
test/teststl.cpp
View File

@ -2260,7 +2260,7 @@ private:
check("void f()\n"
"{\n"
" int x=1;\n"
" string s1, s2;\n"
" std::string s1, s2;\n"
" s1 = s1.substr();\n"
" s2 = s1.substr(x);\n"
" s1 = s2.substr(0, x);\n"
@ -2273,6 +2273,18 @@ private:
"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("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("", errout.str());
check("int main()\n"
"{\n"
" std::string str = \"a1b1\";\n"