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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2016 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"
/// @addtogroup Checks
/** @brief Various small checks for automatic variables */
/// @{
class CPPCHECKLIB CheckAutoVariables : public Check {
public:
/** This constructor is used when registering the CheckClass */
CheckAutoVariables() : Check(myName()) {
}
/** 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 */
void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
checkAutoVariables.assignFunctionArg();
checkAutoVariables.returnReference();
}
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
}
/** assign function argument */
void assignFunctionArg();
/** Check auto variables */
void autoVariables();
/** Returning pointer to local array */
void returnPointerToLocalArray();
/** Returning reference to local/temporary variable */
void returnReference();
private:
static bool isPtrArg(const Token *tok);
static bool isArrayArg(const Token *tok);
static bool isRefPtrArg(const Token *tok);
static bool isNonReferenceArg(const Token *tok);
static bool isAutoVar(const Token *tok);
static bool isAutoVarArray(const Token *tok);
/**
* Returning a temporary object?
* @param tok pointing at the "return" token
* @return true if a temporary object is returned
*/
static bool returnTemporary(const Token *tok);
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);
void errorUselessAssignmentArg(const Token *tok);
void errorUselessAssignmentPtrArg(const Token *tok);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
CheckAutoVariables c(nullptr,settings,errorLogger);
c.errorAutoVariableAssignment(nullptr, false);
c.errorReturnAddressToAutoVariable(nullptr);
c.errorReturnPointerToLocalArray(nullptr);
c.errorReturnReference(nullptr);
c.errorReturnTempReference(nullptr);
c.errorInvalidDeallocation(nullptr);
c.errorReturnAddressOfFunctionParameter(nullptr, "parameter");
c.errorUselessAssignmentArg(nullptr);
c.errorUselessAssignmentPtrArg(nullptr);
}
static std::string myName() {
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"
"- returning address of function parameter\n"
"- suspicious assignment of pointer argument\n"
"- useless assignment of function argument\n";
}
};
/// @}
//---------------------------------------------------------------------------
#endif // checkautovariablesH