418 lines
19 KiB
C++
418 lines
19 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2015 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkotherH
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#define checkotherH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include "check.h"
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class Function;
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class Variable;
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/** Is expressions same? */
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bool isSameExpression(const Token *tok1, const Token *tok2, const std::set<std::string> &constFunctions);
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/** Is expression of floating point type? */
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bool astIsFloat(const Token *tok, bool unknown);
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/// @addtogroup Checks
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/// @{
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/** @brief Various small checks */
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class CPPCHECKLIB CheckOther : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckOther() : Check(myName()) {
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}
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/** @brief This constructor is used when running checks. */
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CheckOther(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {
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}
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/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Checks
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checkOther.warningOldStylePointerCast();
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checkOther.invalidPointerCast();
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checkOther.checkCharVariable();
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checkOther.checkRedundantAssignment();
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checkOther.checkRedundantAssignmentInSwitch();
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checkOther.checkSuspiciousCaseInSwitch();
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checkOther.checkDuplicateBranch();
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checkOther.checkDuplicateExpression();
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checkOther.checkUnreachableCode();
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checkOther.checkSuspiciousSemicolon();
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checkOther.checkVariableScope();
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checkOther.checkSignOfUnsignedVariable(); // don't ignore casts (#3574)
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checkOther.checkIncompleteArrayFill();
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checkOther.checkVarFuncNullUB();
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checkOther.checkNanInArithmeticExpression();
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checkOther.checkCommaSeparatedReturn();
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checkOther.checkIgnoredReturnValue();
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checkOther.checkRedundantPointerOp();
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}
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/** @brief Run checks against the simplified token list */
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Checks
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checkOther.clarifyCalculation();
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checkOther.clarifyStatement();
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checkOther.checkConstantFunctionParameter();
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checkOther.checkIncompleteStatement();
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checkOther.checkCastIntToCharAndBack();
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checkOther.invalidFunctionUsage();
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checkOther.checkZeroDivision();
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checkOther.checkMathFunctions();
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checkOther.redundantGetAndSetUserId();
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checkOther.checkMisusedScopedObject();
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checkOther.checkMemsetZeroBytes();
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checkOther.checkMemsetInvalid2ndParam();
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checkOther.checkSwitchCaseFallThrough();
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checkOther.checkPipeParameterSize();
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checkOther.checkInvalidFree();
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checkOther.checkDoubleFree();
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checkOther.checkRedundantCopy();
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checkOther.checkNegativeBitwiseShift();
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checkOther.checkSuspiciousEqualityComparison();
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checkOther.checkComparisonFunctionIsAlwaysTrueOrFalse();
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}
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/** @brief Clarify calculation for ".. a * b ? .." */
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void clarifyCalculation();
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/** @brief Suspicious statement like '*A++;' */
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void clarifyStatement();
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/** @brief Are there C-style pointer casts in a c++ file? */
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void warningOldStylePointerCast();
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/** @brief Check for pointer casts to a type with an incompatible binary data representation */
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void invalidPointerCast();
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/**
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* @brief Invalid function usage (invalid input value / overlapping data)
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*
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* %Check that given function parameters are valid according to the standard
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* - wrong radix given for strtol/strtoul
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* - overlapping data when using sprintf/snprintf
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* - wrong input value according to library
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*/
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void invalidFunctionUsage();
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/** @brief %Check scope of variables */
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void checkVariableScope();
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static bool checkInnerScope(const Token *tok, const Variable* var, bool& used);
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/** @brief %Check for comma separated statements in return */
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void checkCommaSeparatedReturn();
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/** @brief %Check for constant function parameter */
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void checkConstantFunctionParameter();
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/** @brief Using char variable as array index / as operand in bit operation */
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void checkCharVariable();
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/** @brief Incomplete statement. A statement that only contains a constant or variable */
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void checkIncompleteStatement();
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/** @brief %Check zero division*/
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void checkZeroDivision();
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/** @brief %Check zero division / useless condition */
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void checkZeroDivisionOrUselessCondition();
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/** @brief Check for NaN (not-a-number) in an arithmetic expression */
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void checkNanInArithmeticExpression();
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/** @brief %Check for parameters given to math function that do not make sense*/
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void checkMathFunctions();
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/** @brief % Check for seteuid(geteuid()) or setuid(getuid())*/
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void redundantGetAndSetUserId();
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/** @brief copying to memory or assigning to a variable twice */
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void checkRedundantAssignment();
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/** @brief %Check for assigning to the same variable twice in a switch statement*/
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void checkRedundantAssignmentInSwitch();
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/** @brief %Check for code like 'case A||B:'*/
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void checkSuspiciousCaseInSwitch();
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/** @brief %Check for code like 'case A||B:'*/
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void checkSuspiciousEqualityComparison();
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/** @brief %Check for switch case fall through without comment */
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void checkSwitchCaseFallThrough();
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/** @brief %Check for objects that are destroyed immediately */
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void checkMisusedScopedObject();
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/** @brief %Check for filling zero bytes with memset() */
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void checkMemsetZeroBytes();
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/** @brief %Check for invalid 2nd parameter of memset() */
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void checkMemsetInvalid2ndParam();
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/** @brief %Check for suspicious code where multiple if have the same expression (e.g "if (a) { } else if (a) { }") */
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void checkDuplicateIf();
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/** @brief %Check for suspicious code where if and else branch are the same (e.g "if (a) b = true; else b = true;") */
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void checkDuplicateBranch();
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/** @brief %Check for suspicious code with the same expression on both sides of operator (e.g "if (a && a)") */
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void checkDuplicateExpression();
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/** @brief %Check for code that gets never executed, such as duplicate break statements */
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void checkUnreachableCode();
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/** @brief %Check for testing sign of unsigned variable */
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void checkSignOfUnsignedVariable();
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/** @brief %Check for suspicious use of semicolon */
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void checkSuspiciousSemicolon();
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/** @brief %Check for free() operations on invalid memory locations */
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void checkInvalidFree();
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void invalidFreeError(const Token *tok, bool inconclusive);
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/** @brief %Check for double free or double close operations */
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void checkDoubleFree();
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void doubleFreeError(const Token *tok, const std::string &varname);
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/** @brief %Check for code creating redundant copies */
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void checkRedundantCopy();
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/** @brief %Check for bitwise shift with negative right operand */
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void checkNegativeBitwiseShift();
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/** @brief %Check for buffers that are filled incompletely with memset and similar functions */
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void checkIncompleteArrayFill();
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/** @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. */
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void checkVarFuncNullUB();
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/** @brief %Check that calling the POSIX pipe() system call is called with an integer array of size two. */
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void checkPipeParameterSize();
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/** @brief %Check to avoid casting a return value to unsigned char and then back to integer type. */
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void checkCastIntToCharAndBack();
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/** @brief %Check for using of comparison functions evaluating always to true or false. */
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void checkComparisonFunctionIsAlwaysTrueOrFalse();
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/** @brief %Check for ignored return values. */
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void checkIgnoredReturnValue();
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/** @brief %Check for redundant pointer operations */
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void checkRedundantPointerOp();
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private:
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// Error messages..
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void checkComparisonFunctionIsAlwaysTrueOrFalseError(const Token* tok, const std::string &strFunctionName, const std::string &varName, const bool result);
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void checkCastIntToCharAndBackError(const Token *tok, const std::string &strFunctionName);
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void checkPipeParameterSizeError(const Token *tok, const std::string &strVarName, const std::string &strDim);
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void clarifyCalculationError(const Token *tok, const std::string &op);
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void clarifyStatementError(const Token* tok);
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void redundantGetAndSetUserIdError(const Token *tok);
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void cstyleCastError(const Token *tok);
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void invalidPointerCastError(const Token* tok, const std::string& from, const std::string& to, bool inconclusive);
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void invalidFunctionArgError(const Token *tok, const std::string &functionName, int argnr, const std::string &validstr);
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void invalidFunctionArgBoolError(const Token *tok, const std::string &functionName, int argnr);
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void passedByValueError(const Token *tok, const std::string &parname);
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void constStatementError(const Token *tok, const std::string &type);
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void charArrayIndexError(const Token *tok);
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void charBitOpError(const Token *tok);
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void variableScopeError(const Token *tok, const std::string &varname);
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void zerodivError(const Token *tok, bool inconclusive);
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void zerodivcondError(const Token *tokcond, const Token *tokdiv, bool inconclusive);
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void nanInArithmeticExpressionError(const Token *tok);
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void mathfunctionCallWarning(const Token *tok, const unsigned int numParam = 1);
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void mathfunctionCallWarning(const Token *tok, const std::string& oldexp, const std::string& newexp);
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void redundantAssignmentError(const Token *tok1, const Token* tok2, const std::string& var, bool inconclusive);
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void redundantAssignmentInSwitchError(const Token *tok1, const Token *tok2, const std::string &var);
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void redundantCopyError(const Token *tok1, const Token* tok2, const std::string& var);
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void redundantCopyInSwitchError(const Token *tok1, const Token* tok2, const std::string &var);
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void redundantBitwiseOperationInSwitchError(const Token *tok, const std::string &varname);
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void switchCaseFallThrough(const Token *tok);
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void suspiciousCaseInSwitchError(const Token* tok, const std::string& operatorString);
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void suspiciousEqualityComparisonError(const Token* tok);
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void selfAssignmentError(const Token *tok, const std::string &varname);
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void misusedScopeObjectError(const Token *tok, const std::string &varname);
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void memsetZeroBytesError(const Token *tok, const std::string &varname);
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void memsetFloatError(const Token *tok, const std::string &var_value);
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void memsetValueOutOfRangeError(const Token *tok, const std::string &value);
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void duplicateIfError(const Token *tok1, const Token *tok2);
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void duplicateBranchError(const Token *tok1, const Token *tok2);
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void duplicateExpressionError(const Token *tok1, const Token *tok2, const std::string &op);
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void duplicateExpressionTernaryError(const Token *tok);
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void alwaysTrueFalseStringCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void alwaysTrueStringVariableCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void duplicateBreakError(const Token *tok, bool inconclusive);
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void unreachableCodeError(const Token* tok, bool inconclusive);
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void unsignedLessThanZeroError(const Token *tok, const std::string &varname, bool inconclusive);
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void pointerLessThanZeroError(const Token *tok, bool inconclusive);
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void unsignedPositiveError(const Token *tok, const std::string &varname, bool inconclusive);
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void pointerPositiveError(const Token *tok, bool inconclusive);
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void SuspiciousSemicolonError(const Token *tok);
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void doubleCloseDirError(const Token *tok, const std::string &varname);
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void negativeBitwiseShiftError(const Token *tok);
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void redundantCopyError(const Token *tok, const std::string &varname);
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void incompleteArrayFillError(const Token* tok, const std::string& buffer, const std::string& function, bool boolean);
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void varFuncNullUBError(const Token *tok);
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void commaSeparatedReturnError(const Token *tok);
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void ignoredReturnValueError(const Token* tok, const std::string& function);
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void redundantPointerOpError(const Token* tok, const std::string& varname, bool inconclusive);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckOther c(0, settings, errorLogger);
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// error
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c.invalidFunctionArgError(0, "func_name", 1, "1-4");
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c.invalidFunctionArgBoolError(0, "func_name", 1);
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c.zerodivError(0, false);
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c.zerodivcondError(0,0,false);
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c.misusedScopeObjectError(NULL, "varname");
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c.doubleFreeError(0, "varname");
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c.invalidPointerCastError(0, "float", "double", false);
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c.negativeBitwiseShiftError(0);
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c.checkPipeParameterSizeError(0, "varname", "dimension");
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//performance
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c.redundantCopyError(0, "varname");
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c.redundantCopyError(0, 0, "var");
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c.redundantAssignmentError(0, 0, "var", false);
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// style/warning
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c.checkComparisonFunctionIsAlwaysTrueOrFalseError(0,"isless","varName",false);
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c.checkCastIntToCharAndBackError(0,"func_name");
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c.cstyleCastError(0);
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c.passedByValueError(0, "parametername");
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c.constStatementError(0, "type");
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c.charArrayIndexError(0);
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c.charBitOpError(0);
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c.variableScopeError(0, "varname");
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c.redundantAssignmentInSwitchError(0, 0, "var");
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c.redundantCopyInSwitchError(0, 0, "var");
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c.switchCaseFallThrough(0);
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c.suspiciousCaseInSwitchError(0, "||");
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c.suspiciousEqualityComparisonError(0);
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c.selfAssignmentError(0, "varname");
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c.mathfunctionCallWarning(0);
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c.mathfunctionCallWarning(0, "1 - erf(x)", "erfc(x)");
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c.memsetZeroBytesError(0, "varname");
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c.memsetFloatError(0, "varname");
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c.memsetValueOutOfRangeError(0, "varname");
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c.clarifyCalculationError(0, "+");
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c.clarifyStatementError(0);
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c.duplicateBranchError(0, 0);
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c.duplicateExpressionError(0, 0, "&&");
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c.duplicateExpressionTernaryError(0);
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c.duplicateBreakError(0, false);
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c.unreachableCodeError(0, false);
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c.unsignedLessThanZeroError(0, "varname", false);
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c.unsignedPositiveError(0, "varname", false);
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c.pointerLessThanZeroError(0, false);
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c.pointerPositiveError(0, false);
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c.SuspiciousSemicolonError(0);
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c.incompleteArrayFillError(0, "buffer", "memset", false);
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c.varFuncNullUBError(0);
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c.nanInArithmeticExpressionError(0);
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c.commaSeparatedReturnError(0);
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c.ignoredReturnValueError(0, "malloc");
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c.redundantPointerOpError(0, "varname", false);
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}
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static std::string myName() {
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return "Other";
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}
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std::string classInfo() const {
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return "Other checks\n"
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// error
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"- division with zero\n"
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"- scoped object destroyed immediately after construction\n"
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"- assignment in an assert statement\n"
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"- free() or delete of an invalid memory location\n"
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"- double free() or double closedir()\n"
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"- bitwise operation with negative right operand\n"
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"- provide wrong dimensioned array to pipe() system command (--std=posix)\n"
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"- cast the return values of getc(),fgetc() and getchar() to character and compare it to EOF\n"
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"- invalid input values for functions\n"
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// warning
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"- either division by zero or useless condition\n"
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"- memset() with a value out of range as the 2nd parameter\n"
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"- return value of certain functions not used\n"
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// performance
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"- redundant data copying for const variable\n"
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"- subsequent assignment or copying to a variable or buffer\n"
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// portability
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"- memset() with a float as the 2nd parameter\n"
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"- Passing NULL pointer to function with variable number of arguments leads to UB.\n"
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// style
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"- C-style pointer cast in C++ code\n"
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"- casting between incompatible pointer types\n"
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"- passing parameter by value\n"
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"- [Incomplete statement](IncompleteStatement)\n"
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"- [check how signed char variables are used](CharVar)\n"
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"- variable scope can be limited\n"
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"- unusual pointer arithmetic. For example: \"abc\" + 'd'\n"
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"- redundant assignment, increment, or bitwise operation in a switch statement\n"
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"- redundant strcpy in a switch statement\n"
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"- Suspicious case labels in switch()\n"
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"- assignment of a variable to itself\n"
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"- Comparison of values leading always to true or false\n"
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"- Clarify calculation with parentheses\n"
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"- suspicious comparison of '\\0' with a char* variable\n"
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"- duplicate break statement\n"
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"- unreachable code\n"
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"- testing if unsigned variable is negative/positive\n"
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"- Suspicious use of ; at the end of 'if/for/while' statement.\n"
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"- Array filled incompletely using memset/memcpy/memmove.\n"
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"- redundant get and set function of user id (--std=posix).\n"
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"- NaN (not a number) value used in arithmetic expression.\n"
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"- comma in return statement (the comma can easily be misread as a semicolon).\n"
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"- prefer erfc, expm1 or log1p to avoid loss of precision.\n"
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"- identical code in both branches of if/else or ternary operator.\n"
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"- redundant pointer operation on pointer like &*some_ptr.\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkotherH
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