cppcheck/lib/checkautovariables.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 CheckAutoVariablesH
#define CheckAutoVariablesH
//---------------------------------------------------------------------------
#include "check.h"
#include "token.h"
#include <set>
/// @addtogroup Checks
/// @{
class 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)
{ }
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
{
CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
checkAutoVariables.returnReference();
checkAutoVariables.returncstr();
}
/** Check auto variables */
void autoVariables();
/** Returning pointer to local array */
void returnPointerToLocalArray();
/** Returning reference to local/temporary variable */
void returnReference();
/** Returning c_str to local variable */
void returncstr();
private:
std::set<std::string> fp_list;
std::set<unsigned int> vd_list;
std::set<unsigned int> vda_list;
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bool errorAv(const Token* left, const Token* right);
bool isAutoVar(unsigned int varId);
bool isAutoVarArray(unsigned int varId);
void addVD(unsigned int varId);
void addVDA(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;
void errorReturnPointerToLocalArray(const Token *tok);
void errorAutoVariableAssignment(const Token *tok);
void errorReturnReference(const Token *tok);
void errorReturnTempReference(const Token *tok);
void errorReturnAutocstr(const Token *tok);
void errorReturnTempPointer(const Token *tok);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings)
{
CheckAutoVariables c(0,settings,errorLogger);
c.errorAutoVariableAssignment(0);
c.errorReturnPointerToLocalArray(0);
c.errorReturnReference(0);
c.errorReturnTempReference(0);
c.errorReturnAutocstr(0);
c.errorReturnTempPointer(0);
}
std::string myName() const
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{
return "Auto Variables";
}
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";
}
};
/// @}
//---------------------------------------------------------------------------
#endif