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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 checkunusedfunctionsH
#define checkunusedfunctionsH
#include "check.h"
#include "config.h"
#include <list>
#include <map>
#include <set>
#include <string>
class ErrorLogger;
class Function;
class Settings;
class Tokenizer;
/// @addtogroup Checks
/** @brief Check for functions never called */
/// @{
class CPPCHECKLIB CheckUnusedFunctions : public Check {
/** @brief This constructor is used when registering the CheckUnusedFunctions */
CheckUnusedFunctions() : Check(myName()) {
/** @brief This constructor is used when running checks. */
CheckUnusedFunctions(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(myName(), tokenizer, settings, errorLogger) {
// Parse current tokens and determine..
// * Check what functions are used
// * What functions are declared
void parseTokens(const Tokenizer &tokenizer, const char FileName[], const Settings *settings, bool clear=true);
void check(ErrorLogger * const errorLogger, const Settings& settings);
/** @brief Parse current TU and extract file info */
Check::FileInfo *getFileInfo(const Tokenizer *tokenizer, const Settings *settings) const;
/** @brief Analyse all file infos for all TU */
void analyseWholeProgram(const std::list<Check::FileInfo*> &fileInfo, const Settings& settings, ErrorLogger &errorLogger);
static CheckUnusedFunctions instance;
std::string analyzerInfo() const;
/** @brief Combine and analyze all analyzerInfos for all TUs */
static void analyseWholeProgram(ErrorLogger * const errorLogger, const std::string &buildDir);
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
CheckUnusedFunctions c(nullptr, settings, errorLogger);
c.unusedFunctionError(errorLogger, emptyString, 0, "funcName");
* Dummy implementation, just to provide error for --errorlist
static void unusedFunctionError(ErrorLogger * const errorLogger,
const std::string &filename, unsigned int lineNumber,
const std::string &funcname);
* Dummy implementation, just to provide error for --errorlist
void runSimplifiedChecks(const Tokenizer *, const Settings *, ErrorLogger *) {}
static std::string myName() {
return "Unused functions";
std::string classInfo() const {
return "Check for functions that are never called\n";
class CPPCHECKLIB FunctionUsage {
FunctionUsage() : lineNumber(0), usedSameFile(false), usedOtherFile(false) {
std::string filename;
unsigned int lineNumber;
bool usedSameFile;
bool usedOtherFile;
std::map<std::string, FunctionUsage> _functions;
class CPPCHECKLIB FunctionDecl {
explicit FunctionDecl(const Function *f);
std::string functionName;
unsigned int lineNumber;
std::list<FunctionDecl> _functionDecl;
std::set<std::string> _functionCalls;
/// @}
#endif // checkunusedfunctionsH