141 lines
5.5 KiB
C++
141 lines
5.5 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2022 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 checkexceptionsafetyH
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#define checkexceptionsafetyH
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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 "tokenize.h"
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#include <string>
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class Settings;
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class ErrorLogger;
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class Token;
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// CWE ID used:
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static const struct CWE CWE398(398U); // Indicator of Poor Code Quality
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static const struct CWE CWE703(703U); // Improper Check or Handling of Exceptional Conditions
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static const struct CWE CWE480(480U); // Use of Incorrect Operator
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/// @addtogroup Checks
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/// @{
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/**
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* @brief %Check exception safety (exceptions shouldn't cause leaks nor corrupt data)
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*
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* The problem with these checks is that Cppcheck can't determine what the valid
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* values are for variables. But in some cases (dead pointers) it can be determined
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* that certain variable values are corrupt.
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*/
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class CPPCHECKLIB CheckExceptionSafety : public Check {
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public:
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/** This constructor is used when registering the CheckClass */
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CheckExceptionSafety() : Check(myName()) {}
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/** This constructor is used when running checks. */
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CheckExceptionSafety(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {}
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) override {
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if (tokenizer->isC())
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return;
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CheckExceptionSafety checkExceptionSafety(tokenizer, settings, errorLogger);
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checkExceptionSafety.destructors();
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checkExceptionSafety.deallocThrow();
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checkExceptionSafety.checkRethrowCopy();
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checkExceptionSafety.checkCatchExceptionByValue();
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checkExceptionSafety.nothrowThrows();
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checkExceptionSafety.unhandledExceptionSpecification();
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checkExceptionSafety.rethrowNoCurrentException();
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}
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/** Don't throw exceptions in destructors */
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void destructors();
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/** deallocating memory and then throw (dead pointer) */
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void deallocThrow();
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/** Don't rethrow a copy of the caught exception; use a bare throw instead */
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void checkRethrowCopy();
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/** @brief %Check for exceptions that are caught by value instead of by reference */
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void checkCatchExceptionByValue();
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/** @brief %Check for functions that throw that shouldn't */
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void nothrowThrows();
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/** @brief %Check for unhandled exception specification */
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void unhandledExceptionSpecification();
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/** @brief %Check for rethrow not from catch scope */
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void rethrowNoCurrentException();
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private:
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/** Don't throw exceptions in destructors */
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void destructorsError(const Token * const tok, const std::string &className);
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void deallocThrowError(const Token * const tok, const std::string &varname);
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void rethrowCopyError(const Token * const tok, const std::string &varname);
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void catchExceptionByValueError(const Token *tok);
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void noexceptThrowError(const Token * const tok);
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/** Missing exception specification */
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void unhandledExceptionSpecificationError(const Token * const tok1, const Token * const tok2, const std::string & funcname);
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/** Rethrow without currently handled exception */
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void rethrowNoCurrentExceptionError(const Token *tok);
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/** Generate all possible errors (for --errorlist) */
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override {
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CheckExceptionSafety c(nullptr, settings, errorLogger);
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c.destructorsError(nullptr, "Class");
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c.deallocThrowError(nullptr, "p");
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c.rethrowCopyError(nullptr, "varname");
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c.catchExceptionByValueError(nullptr);
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c.noexceptThrowError(nullptr);
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c.unhandledExceptionSpecificationError(nullptr, nullptr, "funcname");
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c.rethrowNoCurrentExceptionError(nullptr);
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}
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/** Short description of class (for --doc) */
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static std::string myName() {
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return "Exception Safety";
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}
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/** wiki formatted description of the class (for --doc) */
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std::string classInfo() const override {
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return "Checking exception safety\n"
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"- Throwing exceptions in destructors\n"
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"- Throwing exception during invalid state\n"
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"- Throwing a copy of a caught exception instead of rethrowing the original exception\n"
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"- Exception caught by value instead of by reference\n"
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"- Throwing exception in noexcept, nothrow(), __attribute__((nothrow)) or __declspec(nothrow) function\n"
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"- Unhandled exception specification when calling function foo()\n"
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"- Rethrow without currently handled exception\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkexceptionsafetyH
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