cppcheck/lib/checkautovariables.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2012 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 CheckAutoVariablesH
#define CheckAutoVariablesH
//---------------------------------------------------------------------------
#include "config.h"
#include "check.h"
#include "token.h"
/// @addtogroup Checks
/// @{
class CPPCHECKLIB CheckAutoVariables : public Check {
public:
/** This constructor is used when registering the CheckClass */
CheckAutoVariables() : Check(myName())
{ }
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/** This constructor is used when running checks. */
CheckAutoVariables(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(myName(), tokenizer, settings, errorLogger)
{ }
/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
checkAutoVariables.returnReference();
}
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
}
/** Check auto variables */
void autoVariables();
/** Returning pointer to local array */
void returnPointerToLocalArray();
/** Returning reference to local/temporary variable */
void returnReference();
private:
bool isRefPtrArg(unsigned int varId);
bool isPtrArg(unsigned int varId);
bool isAutoVar(unsigned int varId);
bool isAutoVarArray(unsigned int varId);
/**
* Returning a temporary object?
* @param tok pointing at the "return" token
* @return true if a temporary object is returned
*/
bool returnTemporary(const Token *tok, const Scope *scope) const;
void errorReturnAddressToAutoVariable(const Token *tok);
void errorReturnPointerToLocalArray(const Token *tok);
void errorAutoVariableAssignment(const Token *tok, bool inconclusive);
void errorReturnReference(const Token *tok);
void errorReturnTempReference(const Token *tok);
void errorInvalidDeallocation(const Token *tok);
void errorReturnAddressOfFunctionParameter(const Token *tok, const std::string &varname);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
CheckAutoVariables c(0,settings,errorLogger);
c.errorAutoVariableAssignment(0, false);
c.errorReturnAddressToAutoVariable(0);
c.errorReturnPointerToLocalArray(0);
c.errorReturnReference(0);
c.errorReturnTempReference(0);
c.errorInvalidDeallocation(0);
c.errorReturnAddressOfFunctionParameter(0, "parameter");
}
static std::string myName() {
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return "Auto Variables";
}
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std::string classInfo() const {
return "A pointer to a variable is only valid as long as the variable is in scope.\n"
"Check:\n"
"* returning a pointer to auto or temporary variable\n"
"* assigning address of an variable to an effective parameter of a function\n"
"* returning reference to local/temporary variable\n"
"* returning address of function parameter\n";
}
};
/// @}
//---------------------------------------------------------------------------
#endif