473 lines
22 KiB
C++
473 lines
22 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2013 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 "config.h"
|
|
#include "check.h"
|
|
#include "settings.h"
|
|
|
|
class Token;
|
|
class Function;
|
|
class Variable;
|
|
|
|
/// @addtogroup Checks
|
|
/// @{
|
|
|
|
|
|
/** @brief Various small checks */
|
|
|
|
class CPPCHECKLIB 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);
|
|
|
|
// Checks
|
|
checkOther.warningOldStylePointerCast();
|
|
checkOther.invalidPointerCast();
|
|
checkOther.checkUnsignedDivision();
|
|
checkOther.checkCharVariable();
|
|
checkOther.strPlusChar();
|
|
checkOther.checkRedundantAssignment();
|
|
checkOther.checkRedundantAssignmentInSwitch();
|
|
checkOther.checkSuspiciousCaseInSwitch();
|
|
checkOther.checkSelfAssignment();
|
|
checkOther.checkDuplicateIf();
|
|
checkOther.checkDuplicateBranch();
|
|
checkOther.checkDuplicateExpression();
|
|
checkOther.checkUnreachableCode();
|
|
checkOther.checkSuspiciousSemicolon();
|
|
checkOther.checkVariableScope();
|
|
checkOther.clarifyCondition(); // not simplified because ifAssign
|
|
checkOther.checkSignOfUnsignedVariable(); // don't ignore casts (#3574)
|
|
checkOther.checkIncompleteArrayFill();
|
|
checkOther.checkSuspiciousStringCompare();
|
|
checkOther.checkVarFuncNullUB();
|
|
checkOther.checkNanInArithmeticExpression();
|
|
checkOther.checkCommaSeparatedReturn();
|
|
}
|
|
|
|
/** @brief Run checks against the simplified token list */
|
|
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
|
|
CheckOther checkOther(tokenizer, settings, errorLogger);
|
|
|
|
// Checks
|
|
checkOther.oppositeInnerCondition();
|
|
checkOther.clarifyCalculation();
|
|
checkOther.clarifyStatement();
|
|
checkOther.checkConstantFunctionParameter();
|
|
checkOther.checkIncompleteStatement();
|
|
checkOther.checkCastIntToCharAndBack();
|
|
|
|
checkOther.invalidFunctionUsage();
|
|
checkOther.checkZeroDivision();
|
|
checkOther.checkZeroDivisionOrUselessCondition();
|
|
checkOther.checkMathFunctions();
|
|
checkOther.checkCCTypeFunctions();
|
|
|
|
checkOther.redundantGetAndSetUserId();
|
|
checkOther.checkIncorrectLogicOperator();
|
|
checkOther.checkMisusedScopedObject();
|
|
checkOther.checkMemsetZeroBytes();
|
|
checkOther.checkIncorrectStringCompare();
|
|
checkOther.checkSwitchCaseFallThrough();
|
|
checkOther.checkAlwaysTrueOrFalseStringCompare();
|
|
checkOther.checkModuloAlwaysTrueFalse();
|
|
checkOther.checkPipeParameterSize();
|
|
|
|
checkOther.checkInvalidFree();
|
|
checkOther.checkDoubleFree();
|
|
checkOther.checkRedundantCopy();
|
|
checkOther.checkNegativeBitwiseShift();
|
|
checkOther.checkSuspiciousEqualityComparison();
|
|
checkOther.checkComparisonFunctionIsAlwaysTrueOrFalse();
|
|
}
|
|
|
|
/** To check the dead code in a program, which is inaccessible due to the counter-conditions check in nested-if statements **/
|
|
void oppositeInnerCondition();
|
|
|
|
/** @brief Clarify calculation for ".. a * b ? .." */
|
|
void clarifyCalculation();
|
|
|
|
/** @brief Suspicious condition (assignment+comparison) */
|
|
void clarifyCondition();
|
|
|
|
/** @brief Suspicious statement like '*A++;' */
|
|
void clarifyStatement();
|
|
|
|
/** @brief Are there C-style pointer casts in a c++ file? */
|
|
void warningOldStylePointerCast();
|
|
|
|
/** @brief Check for pointer casts to a type with an incompatible binary data representation */
|
|
void invalidPointerCast();
|
|
|
|
/**
|
|
* @brief Invalid function usage (invalid input value / 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
|
|
* - wrong input value according to library
|
|
*/
|
|
void invalidFunctionUsage();
|
|
|
|
/** @brief %Check for unsigned division */
|
|
void checkUnsignedDivision();
|
|
|
|
/** @brief %Check scope of variables */
|
|
void checkVariableScope();
|
|
static bool checkInnerScope(const Token *tok, const Variable* var, bool& used);
|
|
|
|
/** @brief %Check for comma separated statements in return */
|
|
void checkCommaSeparatedReturn();
|
|
|
|
/** @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 zero division / useless condition */
|
|
void checkZeroDivisionOrUselessCondition();
|
|
|
|
/** @brief Check for NaN (not-a-number) in an arithmetic expression */
|
|
void checkNanInArithmeticExpression();
|
|
|
|
/** @brief %Check for parameters given to math function that do not make sense*/
|
|
void checkMathFunctions();
|
|
|
|
/** @brief %Check for parameters given to cctype function that do make error*/
|
|
void checkCCTypeFunctions();
|
|
|
|
/** @brief % Check for seteuid(geteuid()) or setuid(getuid())*/
|
|
void redundantGetAndSetUserId();
|
|
|
|
/** @brief copying to memory or assigning to a variable twice */
|
|
void checkRedundantAssignment();
|
|
|
|
/** @brief %Check for assigning to the same variable twice in a switch statement*/
|
|
void checkRedundantAssignmentInSwitch();
|
|
|
|
/** @brief %Check for code like 'case A||B:'*/
|
|
void checkSuspiciousCaseInSwitch();
|
|
|
|
/** @brief %Check for code like 'case A||B:'*/
|
|
void checkSuspiciousEqualityComparison();
|
|
|
|
/** @brief %Check for switch case fall through without comment */
|
|
void checkSwitchCaseFallThrough();
|
|
|
|
/** @brief %Check for assigning a variable to itself*/
|
|
void checkSelfAssignment();
|
|
|
|
/** @brief %Check for testing for mutual exclusion over ||*/
|
|
void checkIncorrectLogicOperator();
|
|
|
|
/** @brief %Check for objects that are destroyed immediately */
|
|
void checkMisusedScopedObject();
|
|
|
|
/** @brief %Check for filling zero bytes with memset() */
|
|
void checkMemsetZeroBytes();
|
|
|
|
/** @brief %Check for using bad usage of strncmp and substr */
|
|
void checkIncorrectStringCompare();
|
|
|
|
/** @brief %Check for comparison of a string literal with a char* variable */
|
|
void checkSuspiciousStringCompare();
|
|
|
|
/** @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 suspicious usage of modulo (e.g. "if(var % 4 == 4)") */
|
|
void checkModuloAlwaysTrueFalse();
|
|
|
|
/** @brief %Check for code that gets never executed, such as duplicate break statements */
|
|
void checkUnreachableCode();
|
|
|
|
/** @brief %Check for testing sign of unsigned variable */
|
|
void checkSignOfUnsignedVariable();
|
|
|
|
/** @brief %Check for suspicious use of semicolon */
|
|
void checkSuspiciousSemicolon();
|
|
|
|
/** @brief %Check for free() operations on invalid memory locations */
|
|
void checkInvalidFree();
|
|
void invalidFreeError(const Token *tok, bool inconclusive);
|
|
|
|
/** @brief %Check for double free or double close operations */
|
|
void checkDoubleFree();
|
|
void doubleFreeError(const Token *tok, const std::string &varname);
|
|
|
|
/** @brief %Check for code creating redundant copies */
|
|
void checkRedundantCopy();
|
|
|
|
/** @brief %Check for bitwise operation with negative right operand */
|
|
void checkNegativeBitwiseShift();
|
|
|
|
/** @brief %Check for buffers that are filled incompletely with memset and similar functions */
|
|
void checkIncompleteArrayFill();
|
|
|
|
/** @brief %Check that variadic function calls don't use NULL. If NULL is \#defined as 0 and the function expects a pointer, the behaviour is undefined. */
|
|
void checkVarFuncNullUB();
|
|
|
|
/** @brief %Check that calling the POSIX pipe() system call is called with an integer array of size two. */
|
|
void checkPipeParameterSize();
|
|
|
|
/** @brief %Check to avoid casting a return value to unsigned char and then back to integer type. */
|
|
void checkCastIntToCharAndBack();
|
|
|
|
/** @brief %Check for using of comparison functions evaluating always to true or false. */
|
|
void checkComparisonFunctionIsAlwaysTrueOrFalse(void);
|
|
|
|
private:
|
|
bool isUnsigned(const Variable *var) const;
|
|
static bool isSigned(const Variable *var);
|
|
|
|
// Error messages..
|
|
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 clarifyCalculationError(const Token *tok, const std::string &op);
|
|
void clarifyConditionError(const Token *tok, bool assign, bool boolop);
|
|
void clarifyStatementError(const Token* tok);
|
|
void redundantGetAndSetUserIdError(const Token *tok);
|
|
void cstyleCastError(const Token *tok);
|
|
void invalidPointerCastError(const Token* tok, const std::string& from, const std::string& to, bool inconclusive);
|
|
void sprintfOverlappingDataError(const Token *tok, const std::string &varname);
|
|
void invalidFunctionArgError(const Token *tok, const std::string &functionName, int argnr, const std::string &validstr);
|
|
void invalidFunctionArgBoolError(const Token *tok, const std::string &functionName, int argnr);
|
|
void udivError(const Token *tok, bool inconclusive);
|
|
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 zerodivcondError(const Token *tokcond, const Token *tokdiv);
|
|
void nanInArithmeticExpressionError(const Token *tok);
|
|
void mathfunctionCallError(const Token *tok, const unsigned int numParam = 1);
|
|
void cctypefunctionCallError(const Token *tok, const std::string &functionName, const std::string &value);
|
|
void redundantAssignmentError(const Token *tok1, const Token* tok2, const std::string& var, bool inconclusive);
|
|
void redundantAssignmentInSwitchError(const Token *tok1, const Token *tok2, const std::string &var);
|
|
void redundantCopyError(const Token *tok1, const Token* tok2, const std::string& var);
|
|
void redundantCopyInSwitchError(const Token *tok1, const Token* tok2, const std::string &var);
|
|
void redundantBitwiseOperationInSwitchError(const Token *tok, const std::string &varname);
|
|
void switchCaseFallThrough(const Token *tok);
|
|
void suspiciousCaseInSwitchError(const Token* tok, const std::string& operatorString);
|
|
void suspiciousEqualityComparisonError(const Token* tok);
|
|
void selfAssignmentError(const Token *tok, const std::string &varname);
|
|
void incorrectLogicOperatorError(const Token *tok, const std::string &condition, bool always);
|
|
void redundantConditionError(const Token *tok, const std::string &text);
|
|
void misusedScopeObjectError(const Token *tok, const std::string &varname);
|
|
void memsetZeroBytesError(const Token *tok, const std::string &varname);
|
|
void incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string);
|
|
void incorrectStringBooleanError(const Token *tok, const std::string& string);
|
|
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 alwaysTrueStringVariableCompareError(const Token *tok, const std::string& str1, const std::string& str2);
|
|
void suspiciousStringCompareError(const Token* tok, const std::string& var);
|
|
void duplicateBreakError(const Token *tok, bool inconclusive);
|
|
void unreachableCodeError(const Token* tok, bool inconclusive);
|
|
void unsignedLessThanZeroError(const Token *tok, const std::string &varname, bool inconclusive);
|
|
void pointerLessThanZeroError(const Token *tok, bool inconclusive);
|
|
void unsignedPositiveError(const Token *tok, const std::string &varname, bool inconclusive);
|
|
void pointerPositiveError(const Token *tok, bool inconclusive);
|
|
void SuspiciousSemicolonError(const Token *tok);
|
|
void doubleCloseDirError(const Token *tok, const std::string &varname);
|
|
void moduloAlwaysTrueFalseError(const Token* tok, const std::string& maxVal);
|
|
void negativeBitwiseShiftError(const Token *tok);
|
|
void redundantCopyError(const Token *tok, const std::string &varname);
|
|
void incompleteArrayFillError(const Token* tok, const std::string& buffer, const std::string& function, bool boolean);
|
|
void varFuncNullUBError(const Token *tok);
|
|
void commaSeparatedReturnError(const Token *tok);
|
|
|
|
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
|
|
CheckOther c(0, settings, errorLogger);
|
|
|
|
// error
|
|
c.sprintfOverlappingDataError(0, "varname");
|
|
c.invalidFunctionArgError(0, "func_name", 1, "1-4");
|
|
c.invalidFunctionArgBoolError(0, "func_name", 1);
|
|
c.udivError(0, false);
|
|
c.zerodivError(0);
|
|
c.zerodivcondError(0,0);
|
|
c.mathfunctionCallError(0);
|
|
c.misusedScopeObjectError(NULL, "varname");
|
|
c.doubleFreeError(0, "varname");
|
|
c.invalidPointerCastError(0, "float", "double", false);
|
|
c.negativeBitwiseShiftError(0);
|
|
c.checkPipeParameterSizeError(0, "varname", "dimension");
|
|
|
|
//performance
|
|
c.redundantCopyError(0, "varname");
|
|
c.redundantCopyError(0, 0, "var");
|
|
c.redundantAssignmentError(0, 0, "var", false);
|
|
|
|
// style/warning
|
|
c.checkComparisonFunctionIsAlwaysTrueOrFalseError(0,"isless","varName",false);
|
|
c.checkCastIntToCharAndBackError(0,"func_name");
|
|
c.oppositeInnerConditionError(0);
|
|
c.cstyleCastError(0);
|
|
c.passedByValueError(0, "parametername");
|
|
c.constStatementError(0, "type");
|
|
c.charArrayIndexError(0);
|
|
c.charBitOpError(0);
|
|
c.variableScopeError(0, "varname");
|
|
c.strPlusCharError(0);
|
|
c.redundantAssignmentInSwitchError(0, 0, "var");
|
|
c.redundantCopyInSwitchError(0, 0, "var");
|
|
c.switchCaseFallThrough(0);
|
|
c.suspiciousCaseInSwitchError(0, "||");
|
|
c.suspiciousEqualityComparisonError(0);
|
|
c.selfAssignmentError(0, "varname");
|
|
c.incorrectLogicOperatorError(0, "foo > 3 && foo < 4", true);
|
|
c.redundantConditionError(0, "If x > 10 the condition x > 11 is always true.");
|
|
c.memsetZeroBytesError(0, "varname");
|
|
c.clarifyCalculationError(0, "+");
|
|
c.clarifyConditionError(0, true, false);
|
|
c.clarifyStatementError(0);
|
|
c.incorrectStringCompareError(0, "substr", "\"Hello World\"");
|
|
c.suspiciousStringCompareError(0, "foo");
|
|
c.incorrectStringBooleanError(0, "\"Hello World\"");
|
|
c.duplicateIfError(0, 0);
|
|
c.duplicateBranchError(0, 0);
|
|
c.duplicateExpressionError(0, 0, "&&");
|
|
c.alwaysTrueFalseStringCompareError(0, "str1", "str2");
|
|
c.alwaysTrueStringVariableCompareError(0, "varname1", "varname2");
|
|
c.duplicateBreakError(0, false);
|
|
c.unreachableCodeError(0, false);
|
|
c.unsignedLessThanZeroError(0, "varname", false);
|
|
c.unsignedPositiveError(0, "varname", false);
|
|
c.pointerLessThanZeroError(0, false);
|
|
c.pointerPositiveError(0, false);
|
|
c.SuspiciousSemicolonError(0);
|
|
c.cctypefunctionCallError(0, "funname", "value");
|
|
c.moduloAlwaysTrueFalseError(0, "1");
|
|
c.incompleteArrayFillError(0, "buffer", "memset", false);
|
|
c.varFuncNullUBError(0);
|
|
c.nanInArithmeticExpressionError(0);
|
|
c.commaSeparatedReturnError(0);
|
|
}
|
|
|
|
static std::string myName() {
|
|
return "Other";
|
|
}
|
|
|
|
std::string classInfo() const {
|
|
return "Other checks\n"
|
|
|
|
// error
|
|
"* Assigning bool value to pointer (converting bool value to address)\n"
|
|
"* division with zero\n"
|
|
"* scoped object destroyed immediately after construction\n"
|
|
"* assignment in an assert statement\n"
|
|
"* incorrect length arguments for 'substr' and 'strncmp'\n"
|
|
"* free() or delete of an invalid memory location\n"
|
|
"* double free() or double closedir()\n"
|
|
"* bitwise operation with negative right operand\n"
|
|
"* provide wrong dimensioned array to pipe() system command (--std=posix)\n"
|
|
"* cast the return values of getc(),fgetc() and getchar() to character and compare it to EOF\n"
|
|
"* invalid input values for functions\n"
|
|
|
|
// warning
|
|
"* either division by zero or useless condition\n"
|
|
|
|
//performance
|
|
"* redundant data copying for const variable\n"
|
|
"* subsequent assignment or copying to a variable or buffer\n"
|
|
|
|
// style
|
|
"* Find dead code which is inaccessible due to the counter-conditions check in nested if statements\n"
|
|
"* C-style pointer cast in cpp file\n"
|
|
"* casting between incompatible pointer types\n"
|
|
"* redundant if\n"
|
|
"* [[CheckUnsignedDivision|unsigned division]]\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"
|
|
"* unusual pointer arithmetic. For example: \"abc\" + 'd'\n"
|
|
"* redundant assignment in a switch statement\n"
|
|
"* redundant pre/post operation in a switch statement\n"
|
|
"* redundant bitwise operation in a switch statement\n"
|
|
"* redundant strcpy in a switch statement\n"
|
|
"* assignment of a variable to itself\n"
|
|
"* Suspicious case labels in switch()\n"
|
|
"* Suspicious equality comparisons\n"
|
|
"* mutual exclusion over || always evaluating to true\n"
|
|
"* Comparison of values leading always to true or false\n"
|
|
"* Clarify calculation with parentheses\n"
|
|
"* suspicious condition (assignment+comparison)\n"
|
|
"* suspicious condition (runtime comparison of string literals)\n"
|
|
"* suspicious condition (string literals as boolean)\n"
|
|
"* suspicious comparison of a string literal with a char* variable\n"
|
|
"* duplicate break statement\n"
|
|
"* unreachable code\n"
|
|
"* testing if unsigned variable is negative\n"
|
|
"* testing is unsigned variable is positive\n"
|
|
"* Suspicious use of ; at the end of 'if/for/while' statement.\n"
|
|
"* incorrect usage of functions from ctype library.\n"
|
|
"* Comparisons of modulo results that are always true/false.\n"
|
|
"* Array filled incompletely using memset/memcpy/memmove.\n"
|
|
"* redundant get and set function of user id (--std=posix).\n"
|
|
"* Passing NULL pointer to function with variable number of arguments leads to UB on some platforms.\n"
|
|
"* NaN (not a number) value used in arithmetic expression.\n"
|
|
"* comma in return statement (the comma can easily be misread as a semicolon).\n";
|
|
}
|
|
};
|
|
/// @}
|
|
//---------------------------------------------------------------------------
|
|
#endif // checkotherH
|