walkero
/
cppcheck
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

fix #3062 (false negative: Boolean variable is used in bitwise operation)

This commit is contained in:
Robert Reif 2011-09-02 17:19:06 -04:00
parent e19cbf0cdd
commit f29b7f9f08
3 changed files with 98 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
lib/checkother.cpp
View File

@ -220,6 +220,38 @@ void CheckOther::clarifyConditionError(const Token *tok, bool assign, bool boolo
errmsg);
}
//---------------------------------------------------------------------------
// if (bool & bool) -> if (bool && bool)
// if (bool | bool) -> if (bool || bool)
//---------------------------------------------------------------------------
void CheckOther::checkBitwiseOnBoolean()
{
if (!_settings->isEnabled("style"))
return;
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (Token::Match(tok, "(|.|return %var% [&|]"))
{
if (tok->next()->varId())
{
const Variable *var = _tokenizer->getSymbolDatabase()->getVariableFromVarId(tok->next()->varId());
if (var && (var->typeStartToken() == var->typeEndToken()) &&
Token::Match(var->typeStartToken(), "bool|_Bool"))
{
bitwiseOnBooleanError(tok->next(), tok->next()->str(), tok->strAt(2) == "&" ? "&&" : "||");
}
}
}
}
}
void CheckOther::bitwiseOnBooleanError(const Token *tok, const std::string &varname, const std::string &op)
{
reportError(tok, Severity::style, "bitwiseOnBoolean",
"Boolean variable '" + varname + "' is used in bitwise operation. Did you mean " + op + " ?");
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
void CheckOther::warningOldStylePointerCast()

7
lib/checkother.h
View File

@ -102,6 +102,7 @@ public:
checkOther.checkAssignBoolToPointer();
checkOther.checkSignOfUnsignedVariable();
checkOther.checkBitwiseOnBoolean();
}
/** @brief Clarify calculation for ".. a * b ? .." */
@ -225,6 +226,9 @@ public:
/** @brief %Check for testing sign of unsigned variable */
void checkSignOfUnsignedVariable();
/** @brief %Check for using bool in bitwise expression */
void checkBitwiseOnBoolean();
// Error messages..
void cstyleCastError(const Token *tok);
void dangerousUsageStrtolError(const Token *tok);
@ -261,6 +265,7 @@ public:
void assignBoolToPointerError(const Token *tok);
void unsignedLessThanZeroError(const Token *tok, const std::string &varname);
void unsignedPositiveError(const Token *tok, const std::string &varname);
void bitwiseOnBooleanError(const Token *tok, const std::string &varname, const std::string &op);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings)
{
@ -309,6 +314,7 @@ public:
c.duplicateBreakError(0);
c.unsignedLessThanZeroError(0, "varname");
c.unsignedPositiveError(0, "varname");
c.bitwiseOnBooleanError(0, "varname", "&&");
}
std::string myName() const
@ -357,6 +363,7 @@ public:
"* duplicate break statement\n"
"* testing if unsigned variable is negative\n"
"* testing is unsigned variable is positive\n"
"* using bool in bitwise expression\n"
// optimisations
"* optimisation: detect post increment/decrement\n";

59
test/testother.cpp
View File

@ -119,6 +119,7 @@ private:
TEST_CASE(clarifyCondition1); // if (a = b() < 0)
TEST_CASE(clarifyCondition2); // if (a & b == c)
TEST_CASE(clarifyCondition3); // if (! a & b)
TEST_CASE(bitwiseOnBoolean); // if (bool & bool)
TEST_CASE(incorrectStringCompare);
@ -160,6 +161,7 @@ private:
checkOther.checkDuplicateIf();
checkOther.checkDuplicateBranch();
checkOther.checkDuplicateExpression();
checkOther.checkBitwiseOnBoolean();
// Simplify token list..
tokenizer.simplifyTokenList();
@ -2815,6 +2817,63 @@ private:
ASSERT_EQUALS("", errout.str());
}
void bitwiseOnBoolean() // 3062
{
check("void f(_Bool a, _Bool b) {\n"
" if(a & b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean && ?\n", errout.str());
check("void f(_Bool a, _Bool b) {\n"
" if(a | b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean || ?\n", errout.str());
check("void f(bool a, bool b) {\n"
" if(a & b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean && ?\n", errout.str());
check("void f(bool a, bool b) {\n"
" if(a & !b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean && ?\n", errout.str());
check("void f(bool a, bool b) {\n"
" if(a | b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean || ?\n", errout.str());
check("void f(bool a, bool b) {\n"
" if(a | !b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean || ?\n", errout.str());
check("bool a, b;\n"
"void f() {\n"
" if(a & b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean && ?\n", errout.str());
check("bool a, b;\n"
"void f() {\n"
" if(a & !b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean && ?\n", errout.str());
check("bool a, b;\n"
"void f() {\n"
" if(a | b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean || ?\n", errout.str());
check("bool a, b;\n"
"void f() {\n"
" if(a | !b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Boolean variable 'a' is used in bitwise operation. Did you mean || ?\n", errout.str());
}
void incorrectStringCompare()
{
check("int f() {\n"