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cppcheck/lib/checkother.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
#ifndef CheckOtherH
#define CheckOtherH
//---------------------------------------------------------------------------
#include "check.h"
#include "settings.h"
class Token;
/// @addtogroup Checks
/// @{
/** @brief Various small checks */
class CheckOther : public Check
{
public:
/** @brief This constructor is used when registering the CheckClass */
CheckOther() : Check(myName())
{ }
/** @brief This constructor is used when running checks. */
CheckOther(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(myName(), tokenizer, settings, errorLogger)
{ }
/** @brief Run checks against the normal token list */
void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
{
CheckOther checkOther(tokenizer, settings, errorLogger);
// Coding style checks
checkOther.warningOldStylePointerCast();
checkOther.checkUnsignedDivision();
checkOther.checkCharVariable();
checkOther.functionVariableUsage();
checkOther.checkVariableScope();
checkOther.checkStructMemberUsage();
checkOther.strPlusChar();
checkOther.sizeofsizeof();
checkOther.sizeofCalculation();
checkOther.checkRedundantAssignmentInSwitch();
checkOther.checkSwitchCaseFallThrough();
checkOther.checkAssignmentInAssert();
checkOther.checkSizeofForArrayParameter();
checkOther.checkSelfAssignment();
}
/** @brief Run checks against the simplified token list */
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
{
CheckOther checkOther(tokenizer, settings, errorLogger);
checkOther.clarifyCalculation();
// Coding style checks
checkOther.checkConstantFunctionParameter();
checkOther.checkIncompleteStatement();
checkOther.invalidFunctionUsage();
checkOther.checkZeroDivision();
checkOther.checkMathFunctions();
checkOther.checkFflushOnInputStream();
checkOther.invalidScanf();
checkOther.checkIncorrectLogicOperator();
checkOther.checkMisusedScopedObject();
checkOther.checkCatchExceptionByValue();
checkOther.checkMemsetZeroBytes();
checkOther.checkIncorrectStringCompare();
checkOther.checkIncrementBoolean();
checkOther.checkComparisonOfBoolWithInt();
}
/** @brief Clarify calculation for ".. a * b ? .." */
void clarifyCalculation();
void clarifyCalculationError(const Token *tok);
/** @brief Are there C-style pointer casts in a c++ file? */
void warningOldStylePointerCast();
/**
* @brief Invalid function usage (invalid radix / overlapping data)
*
* %Check that given function parameters are valid according to the standard
* - wrong radix given for strtol/strtoul
* - overlapping data when using sprintf/snprintf
*/
void invalidFunctionUsage();
/** @brief %Check for unsigned division */
void checkUnsignedDivision();
/** @brief %Check for unused function variables */
void functionVariableUsage();
void unusedVariableError(const Token *tok, const std::string &varname);
void allocatedButUnusedVariableError(const Token *tok, const std::string &varname);
void unreadVariableError(const Token *tok, const std::string &varname);
void unassignedVariableError(const Token *tok, const std::string &varname);
/** @brief %Check scope of variables */
void checkVariableScope();
/** @brief %Check for constant function parameter */
void checkConstantFunctionParameter();
/** @brief %Check that all struct members are used */
void checkStructMemberUsage();
/** @brief Using char variable as array index / as operand in bit operation */
void checkCharVariable();
/** @brief Incomplete statement. A statement that only contains a constant or variable */
void checkIncompleteStatement();
/** @brief str plus char (unusual pointer arithmetic) */
void strPlusChar();
/** @brief %Check zero division*/
void checkZeroDivision();
/** @brief %Check for parameters given to math function that do not make sense*/
void checkMathFunctions();
void lookupVar(const Token *tok1, const std::string &varname);
/** @brief %Check for using fflush() on an input stream*/
void checkFflushOnInputStream();
/** @brief %Check for 'sizeof sizeof ..' */
void sizeofsizeof();
void sizeofsizeofError(const Token *tok);
/** @brief %Check for calculations inside sizeof */
void sizeofCalculation();
void sizeofCalculationError(const Token *tok);
/** @brief scanf can crash if width specifiers are not used */
void invalidScanf();
void invalidScanfError(const Token *tok);
/** @brief %Check for assigning to the same variable twice in a switch statement*/
void checkRedundantAssignmentInSwitch();
/** @brief %Check for switch case fall through without comment */
void checkSwitchCaseFallThrough();
/** @brief %Check for assigning a variable to itself*/
void checkSelfAssignment();
/** @brief %Check for assignment to a variable in an assert test*/
void checkAssignmentInAssert();
/** @brief %Check for testing for mutual exclusion over ||*/
void checkIncorrectLogicOperator();
/** @brief %Check for objects that are destroyed immediately */
void checkMisusedScopedObject();
/** @brief %Check for exceptions that are caught by value instead of by reference */
void checkCatchExceptionByValue();
/** @brief %Check for filling zero bytes with memset() */
void checkMemsetZeroBytes();
/** @brief %Check for using sizeof with array given as function argument */
void checkSizeofForArrayParameter();
/** @brief %Check for using bad usage of strncmp and substr */
void checkIncorrectStringCompare();
/** @brief %Check for using postfix increment on bool */
void checkIncrementBoolean();
/** @brief %Check for suspicious comparison of a bool and a non-zero (and non-one) value (e.g. "if (!x==4)") */
void checkComparisonOfBoolWithInt();
// Error messages..
void cstyleCastError(const Token *tok);
void dangerousUsageStrtolError(const Token *tok);
void sprintfOverlappingDataError(const Token *tok, const std::string &varname);
void udivError(const Token *tok);
void unusedStructMemberError(const Token *tok, const std::string &structname, const std::string &varname);
void passedByValueError(const Token *tok, const std::string &parname);
void constStatementError(const Token *tok, const std::string &type);
void charArrayIndexError(const Token *tok);
void charBitOpError(const Token *tok);
void variableScopeError(const Token *tok, const std::string &varname);
void conditionAlwaysTrueFalse(const Token *tok, const std::string &truefalse);
void strPlusChar(const Token *tok);
void zerodivError(const Token *tok);
void mathfunctionCallError(const Token *tok, const unsigned int numParam = 1);
void fflushOnInputStreamError(const Token *tok, const std::string &varname);
void redundantAssignmentInSwitchError(const Token *tok, const std::string &varname);
void switchCaseFallThrough(const Token *tok);
void selfAssignmentError(const Token *tok, const std::string &varname);
void assignmentInAssertError(const Token *tok, const std::string &varname);
void incorrectLogicOperatorError(const Token *tok);
void misusedScopeObjectError(const Token *tok, const std::string &varname);
void catchExceptionByValueError(const Token *tok);
void memsetZeroBytesError(const Token *tok, const std::string &varname);
void sizeofForArrayParameterError(const Token *tok);
void incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string, const std::string &len);
void incrementBooleanError(const Token *tok);
void comparisonOfBoolWithIntError(const Token *tok, const std::string &varname);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings)
{
CheckOther c(0, settings, errorLogger);
// error
c.sprintfOverlappingDataError(0, "varname");
c.udivError(0);
c.zerodivError(0);
c.mathfunctionCallError(0);
c.fflushOnInputStreamError(0, "stdin");
c.misusedScopeObjectError(NULL, "varname");
c.sizeofForArrayParameterError(0);
// style/warning
c.cstyleCastError(0);
c.dangerousUsageStrtolError(0);
c.unusedStructMemberError(0, "structname", "variable");
c.passedByValueError(0, "parametername");
c.constStatementError(0, "type");
c.charArrayIndexError(0);
c.charBitOpError(0);
c.variableScopeError(0, "varname");
c.conditionAlwaysTrueFalse(0, "true/false");
c.strPlusChar(0);
c.sizeofsizeofError(0);
c.sizeofCalculationError(0);
c.redundantAssignmentInSwitchError(0, "varname");
c.switchCaseFallThrough(0);
c.selfAssignmentError(0, "varname");
c.assignmentInAssertError(0, "varname");
c.invalidScanfError(0);
c.incorrectLogicOperatorError(0);
c.unusedVariableError(0, "varname");
c.allocatedButUnusedVariableError(0, "varname");
c.unreadVariableError(0, "varname");
c.unassignedVariableError(0, "varname");
c.catchExceptionByValueError(0);
c.memsetZeroBytesError(0, "varname");
c.clarifyCalculationError(0);
c.incorrectStringCompareError(0, "substr", "\"Hello World\"", "12");
c.incrementBooleanError(0);
c.comparisonOfBoolWithIntError(0, "varname");
}
std::string myName() const
{
return "Other";
}
std::string classInfo() const
{
return "Other checks\n"
// error
"* [[OverlappingData|bad usage of the function 'sprintf' (overlapping data)]]\n"
"* division with zero\n"
"* using fflush() on an input stream\n"
"* scoped object destroyed immediately after construction\n"
"* assignment in an assert statement\n"
"* sizeof for array given as function argument\n"
"* incorrect length arguments for 'substr' and 'strncmp'\n"
// style
"* C-style pointer cast in cpp file\n"
"* redundant if\n"
"* bad usage of the function 'strtol'\n"
"* [[CheckUnsignedDivision|unsigned division]]\n"
"* Dangerous usage of 'scanf'\n"
"* unused struct member\n"
"* passing parameter by value\n"
"* [[IncompleteStatement|Incomplete statement]]\n"
"* [[charvar|check how signed char variables are used]]\n"
"* variable scope can be limited\n"
"* condition that is always true/false\n"
"* unusal pointer arithmetic. For example: \"abc\" + 'd'\n"
"* redundant assignment in a switch statement\n"
"* look for 'sizeof sizeof ..'\n"
"* look for calculations inside sizeof()\n"
"* assignment of a variable to itself\n"
"* mutual exclusion over || always evaluating to true\n"
"* exception caught by value instead of by reference\n"
"* Clarify calculation with parantheses\n"
"* using increment on boolean\n"
"* comparison of a boolean with a non-zero integer\n"
// optimisations
"* optimisation: detect post increment/decrement\n";
}
private:
/**
* @brief Used in warningRedundantCode()
* Iterates through the %var% tokens in a fully qualified name and concatenates them.
*/
std::string concatNames(const Token **tok) const
{
std::string varname;
while (Token::Match(*tok, "%var% ::|."))
{
varname.append((*tok)->str());
varname.append((*tok)->next()->str());
*tok = (*tok)->tokAt(2);
}
if (Token::Match(*tok, "%var%"))
varname.append((*tok)->str());
return varname;
}
};
/// @}
//---------------------------------------------------------------------------
#endif
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