cppcheck/lib/checkunusedfunctions.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2022 Cppcheck team.
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*
* 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/>.
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*/
//---------------------------------------------------------------------------
#ifndef checkunusedfunctionsH
#define checkunusedfunctionsH
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//---------------------------------------------------------------------------
#include "check.h"
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#include "config.h"
#include <list>
#include <set>
#include <string>
#include <unordered_map>
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class ErrorLogger;
class Function;
class Settings;
class Tokenizer;
namespace CTU {
class FileInfo;
}
/// @addtogroup Checks
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/** @brief Check for functions never called */
/// @{
class CPPCHECKLIB CheckUnusedFunctions : public Check {
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public:
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/** @brief This constructor is used when registering the CheckUnusedFunctions */
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CheckUnusedFunctions() : Check(myName()) {}
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/** @brief This constructor is used when running checks. */
CheckUnusedFunctions(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {}
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static void clear() {
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instance.mFunctions.clear();
instance.mFunctionCalls.clear();
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}
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// Parse current tokens and determine..
// * Check what functions are used
// * What functions are declared
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void parseTokens(const Tokenizer &tokenizer, const char FileName[], const Settings *settings);
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// Return true if an error is reported.
bool check(ErrorLogger * const errorLogger, const Settings& settings) const;
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/** @brief Parse current TU and extract file info */
Check::FileInfo *getFileInfo(const Tokenizer *tokenizer, const Settings *settings) const override;
/** @brief Analyse all file infos for all TU */
bool analyseWholeProgram(const CTU::FileInfo *ctu, const std::list<Check::FileInfo*> &fileInfo, const Settings& settings, ErrorLogger &errorLogger) override;
static CheckUnusedFunctions instance;
std::string analyzerInfo() const;
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/** @brief Combine and analyze all analyzerInfos for all TUs */
static void analyseWholeProgram(ErrorLogger * const errorLogger, const std::string &buildDir);
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private:
void getErrorMessages(ErrorLogger *errorLogger, const Settings * /*settings*/) const override {
CheckUnusedFunctions::unusedFunctionError(errorLogger, emptyString, 0, "funcName");
}
void runChecks(const Tokenizer * /*tokenizer*/, const Settings * /*settings*/, ErrorLogger * /*errorLogger*/) override {}
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/**
* 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);
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static std::string myName() {
return "Unused functions";
}
std::string classInfo() const override {
return "Check for functions that are never called\n";
}
class CPPCHECKLIB FunctionUsage {
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public:
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FunctionUsage() : lineNumber(0), usedSameFile(false), usedOtherFile(false) {}
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std::string filename;
unsigned int lineNumber;
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bool usedSameFile;
bool usedOtherFile;
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};
std::unordered_map<std::string, FunctionUsage> mFunctions;
class CPPCHECKLIB FunctionDecl {
public:
explicit FunctionDecl(const Function *f);
std::string functionName;
unsigned int lineNumber;
};
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std::list<FunctionDecl> mFunctionDecl;
std::set<std::string> mFunctionCalls;
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};
/// @}
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//---------------------------------------------------------------------------
#endif // checkunusedfunctionsH