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Fixed false negative: Passing uninitialized variable to stream (#4673)

This commit is contained in:
PKEuS 2015-01-22 22:55:08 +01:00
parent da5a04f071
commit da35a74589
2 changed files with 51 additions and 2 deletions
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15
lib/checkuninitvar.cpp
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@ -1783,8 +1783,19 @@ bool CheckUninitVar::isVariableUsage(const Token *vartok, bool pointer, bool all
if (Token::Match(vartok->previous(), "++|--|%cop%")) {
if (_tokenizer->isCPP() && Token::Match(vartok->previous(), ">>|<<")) {
if (Token::Match(vartok->previous()->astOperand1(), ">>|<<"))
return false; // Looks like stream operator
const Token* tok2 = vartok->previous();
if (Token::simpleMatch(tok2->astOperand1(), ">>"))
return false; // Looks like stream operator, initializes the variable
if (Token::simpleMatch(tok2, "<<")) {
// Looks like stream operator, but could also initialize the variable. Check lhs.
do {
tok2 = tok2->astOperand1();
} while (Token::simpleMatch(tok2, "<<"));
if (tok2->strAt(-1) == "::")
tok2 = tok2->previous();
if (tok2 && (Token::simpleMatch(tok2->previous(), "std ::") || (tok2->variable() && tok2->variable()->isStlType()) || tok2->isStandardType()))
return true;
}
const Variable *var = vartok->tokAt(-2)->variable();
return (var && var->typeStartToken()->isStandardType());
}

38
test/testuninitvar.cpp
View File

@ -443,6 +443,19 @@ private:
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVarB("void f(int b) {\n"
" int a;\n"
" std::cin >> b >> a;\n"
" return a;"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(int i) {\n"
" int a;\n"
" i >> a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int a() {\n"
" int ret;\n"
" int a = value >> ret;\n"
@ -480,6 +493,31 @@ private:
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #4673
checkUninitVar2("void f() {\n"
" int a;\n"
" std::cout << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f(std::ostringstream& os) {\n"
" int a;\n"
" os << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f() {\n"
" int a;\n"
" std::cout << 1 << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f(std::ostringstream& os) {\n"
" int a;\n"
" os << 1 << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
}
checkUninitVarB("void a() {\n" // asm