130 lines
5.5 KiB
C++
130 lines
5.5 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2020 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 checkautovariablesH
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#define checkautovariablesH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include "errortypes.h"
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#include <string>
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class Settings;
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class Token;
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class Tokenizer;
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class ErrorLogger;
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class Variable;
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/// @addtogroup Checks
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/** @brief Various small checks for automatic variables */
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/// @{
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class CPPCHECKLIB CheckAutoVariables : public Check {
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public:
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/** This constructor is used when registering the CheckClass */
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CheckAutoVariables() : Check(myName()) {}
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/** This constructor is used when running checks. */
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CheckAutoVariables(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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CheckAutoVariables checkAutoVariables(tokenizer, settings, errorLogger);
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checkAutoVariables.assignFunctionArg();
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checkAutoVariables.checkVarLifetime();
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checkAutoVariables.autoVariables();
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}
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/** assign function argument */
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void assignFunctionArg();
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/** Check auto variables */
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void autoVariables();
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/**
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* Check variable assignment.. value must be changed later or there will be a error reported
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* @return true if error is reported */
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bool checkAutoVariableAssignment(const Token *expr, bool inconclusive, const Token *startToken = nullptr);
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void checkVarLifetime();
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void checkVarLifetimeScope(const Token * start, const Token * end);
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private:
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void errorReturnAddressToAutoVariable(const Token *tok);
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void errorReturnAddressToAutoVariable(const Token *tok, const ValueFlow::Value *value);
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void errorReturnPointerToLocalArray(const Token *tok);
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void errorAutoVariableAssignment(const Token *tok, bool inconclusive);
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void errorReturnDanglingLifetime(const Token *tok, const ValueFlow::Value* val);
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void errorInvalidLifetime(const Token *tok, const ValueFlow::Value* val);
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void errorDanglngLifetime(const Token *tok, const ValueFlow::Value *val);
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void errorDanglingTemporaryLifetime(const Token* tok, const ValueFlow::Value* val);
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void errorReturnReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
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void errorDanglingReference(const Token *tok, const Variable *var, ErrorPath errorPath);
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void errorDanglingTempReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
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void errorReturnTempReference(const Token* tok, ErrorPath errorPath, bool inconclusive);
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void errorInvalidDeallocation(const Token *tok, const ValueFlow::Value *val);
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void errorReturnAddressOfFunctionParameter(const Token *tok, const std::string &varname);
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void errorUselessAssignmentArg(const Token *tok);
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void errorUselessAssignmentPtrArg(const Token *tok);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const OVERRIDE {
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ErrorPath errorPath;
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CheckAutoVariables c(nullptr,settings,errorLogger);
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c.errorAutoVariableAssignment(nullptr, false);
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c.errorReturnAddressToAutoVariable(nullptr);
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c.errorReturnPointerToLocalArray(nullptr);
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c.errorReturnReference(nullptr, errorPath, false);
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c.errorDanglingReference(nullptr, nullptr, errorPath);
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c.errorReturnTempReference(nullptr, errorPath, false);
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c.errorDanglingTempReference(nullptr, errorPath, false);
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c.errorInvalidDeallocation(nullptr, nullptr);
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c.errorReturnAddressOfFunctionParameter(nullptr, "parameter");
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c.errorUselessAssignmentArg(nullptr);
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c.errorUselessAssignmentPtrArg(nullptr);
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c.errorReturnDanglingLifetime(nullptr, nullptr);
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c.errorInvalidLifetime(nullptr, nullptr);
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c.errorDanglngLifetime(nullptr, nullptr);
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c.errorDanglingTemporaryLifetime(nullptr, nullptr);
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}
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static std::string myName() {
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return "Auto Variables";
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}
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std::string classInfo() const OVERRIDE {
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return "A pointer to a variable is only valid as long as the variable is in scope.\n"
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"Check:\n"
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"- returning a pointer to auto or temporary variable\n"
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"- assigning address of an variable to an effective parameter of a function\n"
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"- returning reference to local/temporary variable\n"
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"- returning address of function parameter\n"
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"- suspicious assignment of pointer argument\n"
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"- useless assignment of function argument\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkautovariablesH
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