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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
* 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 <>.
#ifndef checkunusedvarH
#define checkunusedvarH
#include "check.h"
#include "config.h"
#include <map>
#include <string>
class ErrorLogger;
class Scope;
class Settings;
class Token;
class Tokenizer;
class Type;
class Variables;
/// @addtogroup Checks
/// @{
/** @brief Various small checks */
class CPPCHECKLIB CheckUnusedVar : public Check {
/** @brief This constructor is used when registering the CheckClass */
CheckUnusedVar() : Check(myName()) {
/** @brief This constructor is used when running checks. */
CheckUnusedVar(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) {
CheckUnusedVar checkUnusedVar(tokenizer, settings, errorLogger);
// Coding style checks
/** @brief Run checks against the simplified token list */
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
/** @brief %Check for unused function variables */
void checkFunctionVariableUsage_iterateScopes(const Scope* const scope, Variables& variables, bool insideLoop);
void checkFunctionVariableUsage();
/** @brief %Check that all struct members are used */
void checkStructMemberUsage();
bool isRecordTypeWithoutSideEffects(const Type* type);
bool isEmptyType(const Type* type);
// Error messages..
void unusedStructMemberError(const Token *tok, const std::string &structname, const std::string &varname, bool isUnion = false);
void unusedVariableError(const Token *tok, const std::string &varname);
void allocatedButUnusedVariableError(const Token *tok, const std::string &varname);
void unreadVariableError(const Token *tok, const std::string &varname, bool modified);
void unassignedVariableError(const Token *tok, const std::string &varname);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
CheckUnusedVar c(nullptr, settings, errorLogger);
// style/warning
c.unusedVariableError(nullptr, "varname");
c.allocatedButUnusedVariableError(nullptr, "varname");
c.unreadVariableError(nullptr, "varname", false);
c.unassignedVariableError(nullptr, "varname");
c.unusedStructMemberError(nullptr, "structname", "variable");
static std::string myName() {
return "UnusedVar";
std::string classInfo() const {
return "UnusedVar checks\n"
// style
"- unused variable\n"
"- allocated but unused variable\n"
"- unred variable\n"
"- unassigned variable\n"
"- unused struct member\n";
std::map<const Type *,bool> isRecordTypeWithoutSideEffectsMap;
std::map<const Type *,bool> isEmptyTypeMap;
/// @}
#endif // checkunusedvarH