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Improve checking of opposite expressions (#1199) 

* Improve checking of opposite expressions

* Fix some formatting
This commit is contained in:
Paul Fultz II 2018-05-01 23:32:33 -05:00 committed by Daniel Marjamäki
parent b2343a2d4b
commit f191a3e753
4 changed files with 26 additions and 2 deletions
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13
lib/astutils.cpp
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@ -359,6 +359,19 @@ bool isOppositeCond(bool isNot, bool cpp, const Token * const cond1, const Token
(comp1 == ">" && comp2 == "<"))));
}
bool isOppositeExpression(bool cpp, const Token * const tok1, const Token * const tok2, const Library& library, bool pure)
{
if (!tok1 || !tok2)
return false;
if(isOppositeCond(true, cpp, tok1, tok2, library, pure))
return true;
if(tok1->str() == "-")
return isSameExpression(cpp, true, tok1->astOperand1(), tok2, library, pure);
if(tok2->str() == "-")
return isSameExpression(cpp, true, tok2->astOperand1(), tok1, library, pure);
return false;
}
bool isConstExpression(const Token *tok, const Library& library, bool pure)
{
if (!tok)

2
lib/astutils.h
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@ -71,6 +71,8 @@ bool isDifferentKnownValues(const Token * const tok1, const Token * const tok2);
*/
bool isOppositeCond(bool isNot, bool cpp, const Token * const cond1, const Token * const cond2, const Library& library, bool pure);
bool isOppositeExpression(bool cpp, const Token * const tok1, const Token * const tok2, const Library& library, bool pure);
bool isConstExpression(const Token *tok, const Library& library, bool pure);
bool isWithoutSideEffects(bool cpp, const Token* tok);

4
lib/checkother.cpp
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@ -1974,8 +1974,8 @@ void CheckOther::checkDuplicateExpression()
}
}
} else if (styleEnabled &&
isOppositeCond(true, _tokenizer->isCPP(), tok->astOperand1(), tok->astOperand2(), _settings->library, false) &&
!Token::simpleMatch(tok, "=") &&
isOppositeExpression(_tokenizer->isCPP(), tok->astOperand1(), tok->astOperand2(), _settings->library, false) &&
!Token::Match(tok, "=|-|-=|/|/=") &&
isWithoutSideEffects(_tokenizer->isCPP(), tok->astOperand1())) {
oppositeExpressionError(tok, tok, tok->str());
} else if (!Token::Match(tok, "[-/%]")) { // These operators are not associative

9
test/testother.cpp
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@ -3946,6 +3946,15 @@ private:
check("void f(bool a) { a = !a; }");
ASSERT_EQUALS("", errout.str());
check("void f(int a) { if( a < -a ) {}}");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:1]: (style) Opposite expression on both sides of '<'.\n", errout.str());
check("void f(int a) { a -= -a; }");
ASSERT_EQUALS("", errout.str());
check("void f(int a) { a = a / (-a); }");
ASSERT_EQUALS("", errout.str());
}
void duplicateVarExpression() {