416 lines
17 KiB
C++
416 lines
17 KiB
C++
/*
|
|
* 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.strPlusChar();
|
|
checkOther.sizeofsizeof();
|
|
checkOther.sizeofCalculation();
|
|
checkOther.checkRedundantAssignmentInSwitch();
|
|
checkOther.checkAssignmentInAssert();
|
|
checkOther.checkSizeofForArrayParameter();
|
|
checkOther.checkSizeofForNumericParameter();
|
|
checkOther.checkSelfAssignment();
|
|
checkOther.checkDuplicateIf();
|
|
checkOther.checkDuplicateBranch();
|
|
checkOther.checkDuplicateExpression();
|
|
checkOther.checkDuplicateBreak();
|
|
checkOther.checkSuspiciousSemicolon();
|
|
|
|
// information checks
|
|
checkOther.checkVariableScope();
|
|
|
|
checkOther.clarifyCondition(); // not simplified because ifAssign
|
|
checkOther.checkComparisonOfBoolExpressionWithInt();
|
|
}
|
|
|
|
/** @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.checkCoutCerrMisusage();
|
|
checkOther.checkIncorrectLogicOperator();
|
|
checkOther.checkMisusedScopedObject();
|
|
checkOther.checkCatchExceptionByValue();
|
|
checkOther.checkMemsetZeroBytes();
|
|
checkOther.checkIncorrectStringCompare();
|
|
checkOther.checkIncrementBoolean();
|
|
checkOther.checkComparisonOfBoolWithInt();
|
|
checkOther.checkSwitchCaseFallThrough();
|
|
checkOther.checkAlwaysTrueOrFalseStringCompare();
|
|
|
|
checkOther.checkAssignBoolToPointer();
|
|
checkOther.checkSignOfUnsignedVariable();
|
|
checkOther.checkBitwiseOnBoolean();
|
|
}
|
|
|
|
/** @brief Clarify calculation for ".. a * b ? .." */
|
|
void clarifyCalculation();
|
|
void clarifyCalculationError(const Token *tok, const std::string &op);
|
|
|
|
/** @brief Suspicious condition (assignment+comparison) */
|
|
void clarifyCondition();
|
|
void clarifyConditionError(const Token *tok, bool assign, bool boolop);
|
|
|
|
/** @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 scope of variables */
|
|
void checkVariableScope();
|
|
|
|
/** @brief %Check for constant function parameter */
|
|
void checkConstantFunctionParameter();
|
|
|
|
/** @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 missusage of std::cout */
|
|
void checkCoutCerrMisusage();
|
|
|
|
/** @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 sizeof with numeric given as function argument */
|
|
void checkSizeofForNumericParameter();
|
|
|
|
/** @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();
|
|
|
|
/** @brief %Check for suspicious code where multiple if have the same expression (e.g "if (a) { } else if (a) { }") */
|
|
void checkDuplicateIf();
|
|
|
|
/** @brief %Check for suspicious code where if and else branch are the same (e.g "if (a) b = true; else b = true;") */
|
|
void checkDuplicateBranch();
|
|
|
|
/** @brief %Check for suspicious code with the same expression on both sides of operator (e.g "if (a && a)") */
|
|
void checkDuplicateExpression();
|
|
|
|
/** @brief %Check for suspicious code that compares string literals for equality */
|
|
void checkAlwaysTrueOrFalseStringCompare();
|
|
|
|
/** @brief %Check for duplicate break statements in a switch or loop */
|
|
void checkDuplicateBreak();
|
|
|
|
/** @brief assigning bool to pointer */
|
|
void checkAssignBoolToPointer();
|
|
|
|
/** @brief %Check for testing sign of unsigned variable */
|
|
void checkSignOfUnsignedVariable();
|
|
|
|
/** @brief %Check for using bool in bitwise expression */
|
|
void checkBitwiseOnBoolean();
|
|
|
|
/** @brief %Check for comparing a bool expression with an integer other than 0 or 1 */
|
|
void checkComparisonOfBoolExpressionWithInt();
|
|
|
|
/** @brief %Check for suspicious use of semicolon */
|
|
void checkSuspiciousSemicolon();
|
|
|
|
// 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 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 strPlusCharError(const Token *tok);
|
|
void zerodivError(const Token *tok);
|
|
void coutCerrMisusageError(const Token* tok, const std::string& streamName);
|
|
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 redundantStrcpyInSwitchError(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, bool always);
|
|
void secondAlwaysTrueFalseWhenFirstTrueError(const Token *tok, const std::string &truefalse);
|
|
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 sizeofForNumericParameterError(const Token *tok);
|
|
void incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string, const std::string &len);
|
|
void incorrectStringBooleanError(const Token *tok, const std::string& string);
|
|
void incrementBooleanError(const Token *tok);
|
|
void comparisonOfBoolWithIntError(const Token *tok, const std::string &expression);
|
|
void duplicateIfError(const Token *tok1, const Token *tok2);
|
|
void duplicateBranchError(const Token *tok1, const Token *tok2);
|
|
void duplicateExpressionError(const Token *tok1, const Token *tok2, const std::string &op);
|
|
void alwaysTrueFalseStringCompareError(const Token *tok, const std::string& str1, const std::string& str2);
|
|
void duplicateBreakError(const Token *tok);
|
|
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 comparisonOfBoolExpressionWithIntError(const Token *tok);
|
|
void SuspiciousSemicolonError(const Token *tok);
|
|
|
|
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) {
|
|
CheckOther c(0, settings, errorLogger);
|
|
|
|
// error
|
|
c.assignBoolToPointerError(0);
|
|
c.sprintfOverlappingDataError(0, "varname");
|
|
c.udivError(0);
|
|
c.zerodivError(0);
|
|
c.mathfunctionCallError(0);
|
|
c.fflushOnInputStreamError(0, "stdin");
|
|
c.misusedScopeObjectError(NULL, "varname");
|
|
c.sizeofForArrayParameterError(0);
|
|
c.sizeofForNumericParameterError(0);
|
|
c.coutCerrMisusageError(0, "cout");
|
|
|
|
// style/warning
|
|
c.cstyleCastError(0);
|
|
c.dangerousUsageStrtolError(0);
|
|
c.passedByValueError(0, "parametername");
|
|
c.constStatementError(0, "type");
|
|
c.charArrayIndexError(0);
|
|
c.charBitOpError(0);
|
|
c.variableScopeError(0, "varname");
|
|
c.strPlusCharError(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, true);
|
|
c.secondAlwaysTrueFalseWhenFirstTrueError(0, "when first comparison is true, the 2nd comparison is always true");
|
|
c.catchExceptionByValueError(0);
|
|
c.memsetZeroBytesError(0, "varname");
|
|
c.clarifyCalculationError(0, "+");
|
|
c.clarifyConditionError(0, true, false);
|
|
c.incorrectStringCompareError(0, "substr", "\"Hello World\"", "12");
|
|
c.incorrectStringBooleanError(0, "\"Hello World\"");
|
|
c.incrementBooleanError(0);
|
|
c.comparisonOfBoolWithIntError(0, "varname");
|
|
c.duplicateIfError(0, 0);
|
|
c.duplicateBranchError(0, 0);
|
|
c.duplicateExpressionError(0, 0, "&&");
|
|
c.alwaysTrueFalseStringCompareError(0, "str1", "str2");
|
|
c.duplicateBreakError(0);
|
|
c.unsignedLessThanZeroError(0, "varname");
|
|
c.unsignedPositiveError(0, "varname");
|
|
c.bitwiseOnBooleanError(0, "varname", "&&");
|
|
c.comparisonOfBoolExpressionWithIntError(0);
|
|
c.SuspiciousSemicolonError(0);
|
|
}
|
|
|
|
std::string myName() const {
|
|
return "Other";
|
|
}
|
|
|
|
std::string classInfo() const {
|
|
return "Other checks\n"
|
|
|
|
// error
|
|
"* Assigning bool value to pointer (converting bool value to address)\n"
|
|
"* [[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"
|
|
"* sizeof for numeric given as function argument\n"
|
|
"* incorrect length arguments for 'substr' and 'strncmp'\n"
|
|
"* invalid usage of output stream. For example: std::cout << std::cout;'\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"
|
|
"* 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"
|
|
"* redundant strcpy 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 parentheses\n"
|
|
"* using increment on boolean\n"
|
|
"* comparison of a boolean with a non-zero integer\n"
|
|
"* comparison of a boolean expression with an integer other than 0 or 1\n"
|
|
"* suspicious condition (assignment+comparison)\n"
|
|
"* suspicious condition (runtime comparison of string literals)\n"
|
|
"* suspicious condition (string literals as boolean)\n"
|
|
"* duplicate break statement\n"
|
|
"* testing if unsigned variable is negative\n"
|
|
"* testing is unsigned variable is positive\n"
|
|
"* using bool in bitwise expression\n"
|
|
"* Suspicious use of ; at the end of 'if/for/while' statement.\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
|
|
|