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/* -*- C++ -*-
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 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 "config.h"
#include "errortypes.h"
#include <string>
#include <set>
class Settings;
class Token;
class ErrorLogger;
class Variable;
class Tokenizer;
namespace ValueFlow {
class Value;
}
/// @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()) {}
private:
/** 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, ErrorLogger *errorLogger) override;
/** assign function argument */
void assignFunctionArg();
/** Check auto variables */
void autoVariables();
/**
* Check variable assignment.. value must be changed later or there will be a error reported
* @return true if error is reported */
bool checkAutoVariableAssignment(const Token *expr, bool inconclusive, const Token *startToken = nullptr);
void checkVarLifetime();
void checkVarLifetimeScope(const Token * start, const Token * end);
void errorAutoVariableAssignment(const Token *tok, bool inconclusive);
void errorReturnDanglingLifetime(const Token *tok, const ValueFlow::Value* val);
void errorInvalidLifetime(const Token *tok, const ValueFlow::Value* val);
void errorDanglngLifetime(const Token *tok, const ValueFlow::Value *val, bool isStatic = false);
void errorDanglingTemporaryLifetime(const Token* tok, const ValueFlow::Value* val, const Token* tempTok);
void errorReturnReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
void errorDanglingReference(const Token *tok, const Variable *var, ErrorPath errorPath);
void errorDanglingTempReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
void errorReturnTempReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
void errorInvalidDeallocation(const Token *tok, const ValueFlow::Value *val);
void errorUselessAssignmentArg(const Token *tok);
void errorUselessAssignmentPtrArg(const Token *tok);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override;
static std::string myName() {
return "Auto Variables";
}
std::string classInfo() const override {
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";
}
/** returns true if tokvalue has already been diagnosed */
bool diag(const Token* tokvalue);
std::set<const Token*> mDiagDanglingTemp;
};
/// @}
//---------------------------------------------------------------------------
#endif // checkautovariablesH
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