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Fixed oppositeInnerCondition check: 

- Resolved false positives #4170 and #4186, as well as numerous other potential false positives
- Improved message to point to both locations
- Inner condition could also be a while loop; Outer if could also be 'else if'
- Made the check non-experimental again (#3645)
This commit is contained in:
PKEuS 2014-03-28 14:55:17 +01:00
parent 44be3e5092
commit 50a94885ce
3 changed files with 88 additions and 49 deletions
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82
lib/checkother.cpp
View File

@ -3377,59 +3377,56 @@ void CheckOther::incompleteArrayFillError(const Token* tok, const std::string& b
void CheckOther::oppositeInnerCondition()
{
// FIXME: This check is experimental because of #4170 and #4186. Fix those tickets and remove the "experimental".
if (!_settings->isEnabled("warning") || !_settings->inconclusive || !_settings->experimental)
if (!_settings->isEnabled("warning") || !_settings->inconclusive)
return;
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
for (std::list<Scope>::const_iterator scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope) {
const Token* const toke = scope->classDef;
if (scope->type != Scope::eIf && scope->type != Scope::eElseIf)
continue;
const Token *op1Tok, *op2Tok;
op1Tok = scope->classDef->tokAt(2);
op2Tok = scope->classDef->tokAt(4);
if (scope->type == Scope::eIf && toke) {
if (scope->classDef->strAt(6) == "{") {
const Token *op1Tok, *op2Tok;
op1Tok = scope->classDef->tokAt(2);
op2Tok = scope->classDef->tokAt(4);
const char *oppositeCondition = nullptr;
if (scope->classDef->strAt(6) == "{") {
if (scope->classDef->strAt(3) == "==")
oppositeCondition = "if|while ( %any% !=|<|>|<=|>= %any% )";
else if (scope->classDef->strAt(3) == "!=")
oppositeCondition = "if|while ( %any% ==|>=|<= %any% )";
else if (scope->classDef->strAt(3) == "<")
oppositeCondition = "if|while ( %any% >|>=|== %any% )";
else if (scope->classDef->strAt(3) == "<=")
oppositeCondition = "if|while ( %any% > %any% )";
else if (scope->classDef->strAt(3) == ">")
oppositeCondition = "if|while ( %any% <|<=|== %any% )";
else if (scope->classDef->strAt(3) == ">=")
oppositeCondition = "if|while ( %any% < %any% )";
const char *oppositeCondition = nullptr;
if (oppositeCondition) {
int flag = 0;
if (scope->classDef->strAt(3) == "==")
oppositeCondition = "if ( %any% !=|<|>|<=|>= %any% )";
else if (scope->classDef->strAt(3) == "!=")
oppositeCondition = "if ( %any% ==|>=|<= %any% )";
else if (scope->classDef->strAt(3) == "<")
oppositeCondition = "if ( %any% >|>=|== %any% )";
else if (scope->classDef->strAt(3) == "<=")
oppositeCondition = "if ( %any% > %any% )";
else if (scope->classDef->strAt(3) == ">")
oppositeCondition = "if ( %any% <|<=|== %any% )";
else if (scope->classDef->strAt(3) == ">=")
oppositeCondition = "if ( %any% < %any% )";
for (const Token* tok = scope->classStart; tok != scope->classEnd && flag == 0; tok = tok->next()) {
if ((tok->str() == op1Tok->str() || tok->str() == op2Tok->str()) && (tok->next()->isAssignmentOp() || tok->next()->type() == Token::eIncDecOp))
break;
if (oppositeCondition) {
int flag = 0;
for (const Token* tok = scope->classStart; tok != scope->classEnd && flag == 0; tok = tok->next()) {
if ((tok->str() == op1Tok->str() || tok->str() == op2Tok->str()) && tok->strAt(1) == "=")
break;
else if (Token::Match(tok, "%any% ( %any% )")) {
if ((tok->strAt(2) == op1Tok->str() || tok->strAt(2) == op2Tok->str()))
if (Token::Match(tok, oppositeCondition)) {
if ((tok->strAt(2) == op1Tok->str() && tok->strAt(4) == op2Tok->str()) || (tok->strAt(2) == op2Tok->str() && tok->strAt(4) == op1Tok->str()))
oppositeInnerConditionError(scope->classDef, tok);
} else if (Token::Match(tok, "%any% (")) {
if (tok->function()) { // Check if it is a member function. If yes: bailout (TODO: this causes false negatives, since we do not check of which function this is a member
const Function* func = tok->function();
if (!func->isConst && (func->access == Private || func->access == Protected || func->access == Public))
break;
} else if (Token::Match(tok, "%any% ( %any% , %any%")) {
for (const Token* tok2 = tok->next(); tok2 != tok->linkAt(1); tok2 = tok2->next()) {
if (tok2->str() == op1Tok->str()) {
flag = 1;
break;
}
}
} else if (Token::Match(tok, oppositeCondition)) {
if ((tok->strAt(2) == op1Tok->str() && tok->strAt(4) == op2Tok->str()) || (tok->strAt(2) == op2Tok->str() && tok->strAt(4) == op1Tok->str()))
oppositeInnerConditionError(toke);
}
if (op1Tok->varId() && Token::findmatch(tok->next(), "%varid%", tok->linkAt(1), op1Tok->varId()) != nullptr)
break;
if (op2Tok->varId() && Token::findmatch(tok->next(), "%varid%", tok->linkAt(1), op2Tok->varId()) != nullptr)
break;
}
}
}
@ -3437,9 +3434,12 @@ void CheckOther::oppositeInnerCondition()
}
}
void CheckOther::oppositeInnerConditionError(const Token *tok)
void CheckOther::oppositeInnerConditionError(const Token *tok1, const Token* tok2)
{
reportError(tok, Severity::warning, "oppositeInnerCondition", "Opposite conditions in nested 'if' blocks lead to a dead code block.", true);
std::list<const Token*> callstack;
callstack.push_back(tok1);
callstack.push_back(tok2);
reportError(callstack, Severity::warning, "oppositeInnerCondition", "Opposite conditions in nested 'if' blocks lead to a dead code block.", true);
}

4
lib/checkother.h
View File

@ -273,7 +273,7 @@ private:
void checkComparisonFunctionIsAlwaysTrueOrFalseError(const Token* tok, const std::string &strFunctionName, const std::string &varName, const bool result);
void checkCastIntToCharAndBackError(const Token *tok, const std::string &strFunctionName);
void checkPipeParameterSizeError(const Token *tok, const std::string &strVarName, const std::string &strDim);
void oppositeInnerConditionError(const Token *tok);
void oppositeInnerConditionError(const Token *tok1, const Token* tok2);
void clarifyCalculationError(const Token *tok, const std::string &op);
void clarifyConditionError(const Token *tok, bool assign, bool boolop);
void clarifyStatementError(const Token* tok);
@ -357,7 +357,7 @@ private:
// style/warning
c.checkComparisonFunctionIsAlwaysTrueOrFalseError(0,"isless","varName",false);
c.checkCastIntToCharAndBackError(0,"func_name");
c.oppositeInnerConditionError(0);
c.oppositeInnerConditionError(0, 0);
c.cstyleCastError(0);
c.passedByValueError(0, "parametername");
c.constStatementError(0, "type");

51
test/testother.cpp
View File

@ -297,13 +297,52 @@ private:
void oppositeInnerCondition() {
check("void foo(int a, int b)\n"
"{\n"
check("void foo(int a, int b) {\n"
" if(a==b)\n"
" if(a!=b)\n"
" cout << a;\n"
"}", "test.cpp", true, true);
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Opposite conditions in nested 'if' blocks lead to a dead code block.\n", errout.str());
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (warning, inconclusive) Opposite conditions in nested 'if' blocks lead to a dead code block.\n", errout.str());
check("void foo(int a) {\n"
" if(a >= 50) {\n"
" if(a < 50)\n"
" cout << a;\n"
" else\n"
" cout << 100;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (warning, inconclusive) Opposite conditions in nested 'if' blocks lead to a dead code block.\n", errout.str());
// #4186
check("void foo(int a) {\n"
" if(a >= 50) {\n"
" if(a > 50)\n"
" cout << a;\n"
" else\n"
" cout << 100;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// 4170
check("class foo {\n"
" void bar() {\n"
" if (tok == '(') {\n"
" next();\n"
" if (tok == ',') {\n"
" next();\n"
" if (tok != ',') {\n"
" op->reg2 = asm_parse_reg();\n"
" }\n"
" skip(',');\n"
" }\n"
" }\n"
" }\n"
" void next();\n"
" const char *tok;\n"
"};");
ASSERT_EQUALS("", errout.str());
check("void foo(int i)\n"
"{\n"
@ -313,7 +352,7 @@ private:
" cout << a;\n"
" }\n"
" }\n"
"}", "test.cpp", true, true);
"}");
ASSERT_EQUALS("", errout.str());
@ -328,7 +367,7 @@ private:
" if(i<5){\n"
" }\n"
" }\n"
"}", "test.cpp", true, true);
"}");
ASSERT_EQUALS("", errout.str());
}