118 lines
4.1 KiB
C++
118 lines
4.1 KiB
C++
/*
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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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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkunusedvarH
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#define checkunusedvarH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include <list>
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#include <map>
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#include <string>
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class ErrorLogger;
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class Scope;
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class Settings;
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class Token;
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class Tokenizer;
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class Type;
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class Variables;
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class Variable;
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class Function;
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/// @addtogroup Checks
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/// @{
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/** @brief Various small checks */
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class CPPCHECKLIB CheckUnusedVar : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckUnusedVar() : Check(myName()) {}
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/** @brief This constructor is used when running checks. */
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CheckUnusedVar(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {}
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/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) override {
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CheckUnusedVar checkUnusedVar(tokenizer, settings, errorLogger);
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// Coding style checks
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checkUnusedVar.checkStructMemberUsage();
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checkUnusedVar.checkFunctionVariableUsage();
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}
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/** @brief %Check for unused function variables */
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void checkFunctionVariableUsage_iterateScopes(const Scope* const scope, Variables& variables);
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void checkFunctionVariableUsage();
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/** @brief %Check that all struct members are used */
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void checkStructMemberUsage();
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private:
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bool isRecordTypeWithoutSideEffects(const Type* type);
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bool isVariableWithoutSideEffects(const Variable& var);
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bool isEmptyType(const Type* type);
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bool isFunctionWithoutSideEffects(const Function& func, const Token* functionUsageToken,
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std::list<const Function*> checkedFuncs);
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// Error messages..
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void unusedStructMemberError(const Token *tok, const std::string &structname, const std::string &varname, bool isUnion = false);
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void unusedVariableError(const Token *tok, const std::string &varname);
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void allocatedButUnusedVariableError(const Token *tok, const std::string &varname);
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void unreadVariableError(const Token *tok, const std::string &varname, bool modified);
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void unassignedVariableError(const Token *tok, const std::string &varname);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override {
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CheckUnusedVar c(nullptr, settings, errorLogger);
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c.unusedVariableError(nullptr, "varname");
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c.allocatedButUnusedVariableError(nullptr, "varname");
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c.unreadVariableError(nullptr, "varname", false);
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c.unassignedVariableError(nullptr, "varname");
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c.unusedStructMemberError(nullptr, "structname", "variable");
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}
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static std::string myName() {
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return "UnusedVar";
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}
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std::string classInfo() const override {
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return "UnusedVar checks\n"
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// style
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"- unused variable\n"
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"- allocated but unused variable\n"
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"- unread variable\n"
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"- unassigned variable\n"
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"- unused struct member\n";
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}
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std::map<const Type *,bool> mIsRecordTypeWithoutSideEffectsMap;
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std::map<const Type *,bool> mIsEmptyTypeMap;
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkunusedvarH
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