239 lines
9.7 KiB
C++
239 lines
9.7 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2012 Daniel Marjamäki and 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 CheckClassH
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#define CheckClassH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include "check.h"
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class Token;
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class Scope;
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class Function;
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/// @addtogroup Checks
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/// @{
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/** @brief %Check classes. Uninitialized member variables, non-conforming operators, missing virtual destructor, etc */
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class CPPCHECKLIB CheckClass : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckClass() : Check(myName()), symbolDatabase(NULL)
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{ }
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/** @brief This constructor is used when running checks. */
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CheckClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger);
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/** @brief Run checks on the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckClass checkClass(tokenizer, settings, errorLogger);
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// can't be a simplified check .. the 'sizeof' is used.
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checkClass.noMemset();
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}
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/** @brief Run checks on the simplified token list */
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckClass checkClass(tokenizer, settings, errorLogger);
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// Coding style checks
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checkClass.constructors();
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checkClass.operatorEq();
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checkClass.privateFunctions();
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checkClass.operatorEqRetRefThis();
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checkClass.thisSubtraction();
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checkClass.operatorEqToSelf();
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checkClass.initializerListOrder();
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checkClass.initializationListUsage();
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checkClass.virtualDestructor();
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checkClass.checkConst();
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}
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/** @brief %Check that all class constructors are ok */
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void constructors();
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/** @brief %Check that all private functions are called */
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void privateFunctions();
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/**
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* @brief %Check that the memsets are valid.
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* The 'memset' function can do dangerous things if used wrong. If it
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* is used on STL containers for instance it will clear all its data
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* and then the STL container may leak memory or worse have an invalid state.
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* It can also overwrite the virtual table.
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* Important: The checking doesn't work on simplified tokens list.
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*/
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void noMemset();
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void checkMemsetType(const Scope *start, const Token *tok, const Scope *type);
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/** @brief 'operator=' should return something and it should not be const. */
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void operatorEq();
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/** @brief 'operator=' should return reference to *this */
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void operatorEqRetRefThis(); // Warning upon no "return *this;"
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/** @brief 'operator=' should check for assignment to self */
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void operatorEqToSelf(); // Warning upon no check for assignment to self
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/** @brief The destructor in a base class should be virtual */
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void virtualDestructor();
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/** @brief warn for "this-x". The indented code may be "this->x" */
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void thisSubtraction();
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/** @brief can member function be const? */
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void checkConst();
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/** @brief Check initializer list order */
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void initializerListOrder();
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void initializationListUsage();
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private:
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const SymbolDatabase *symbolDatabase;
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// Reporting errors..
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void noConstructorError(const Token *tok, const std::string &classname, bool isStruct);
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void uninitVarError(const Token *tok, const std::string &classname, const std::string &varname);
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void operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname);
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void unusedPrivateFunctionError(const Token *tok, const std::string &classname, const std::string &funcname);
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void memsetError(const Token *tok, const std::string &memfunc, const std::string &classname, const std::string &type);
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void operatorEqReturnError(const Token *tok, const std::string &className);
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void virtualDestructorError(const Token *tok, const std::string &Base, const std::string &Derived);
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void thisSubtractionError(const Token *tok);
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void operatorEqRetRefThisError(const Token *tok);
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void operatorEqToSelfError(const Token *tok);
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void checkConstError(const Token *tok, const std::string &classname, const std::string &funcname, bool suggestStatic);
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void checkConstError2(const Token *tok1, const Token *tok2, const std::string &classname, const std::string &funcname, bool suggestStatic);
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void initializerListError(const Token *tok1,const Token *tok2, const std::string & classname, const std::string &varname);
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void suggestInitializationList(const Token *tok, const std::string& varname);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckClass c(0, settings, errorLogger);
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c.noConstructorError(0, "classname", false);
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c.uninitVarError(0, "classname", "varname");
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c.operatorEqVarError(0, "classname", "");
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c.unusedPrivateFunctionError(0, "classname", "funcname");
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c.memsetError(0, "memfunc", "classname", "class");
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c.operatorEqReturnError(0, "class");
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c.virtualDestructorError(0, "Base", "Derived");
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c.thisSubtractionError(0);
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c.operatorEqRetRefThisError(0);
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c.operatorEqToSelfError(0);
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c.checkConstError(0, "class", "function", false);
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c.checkConstError(0, "class", "function", true);
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c.initializerListError(0, 0, "class", "variable");
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c.suggestInitializationList(0, "variable");
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}
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std::string myName() const {
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return "Class";
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}
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std::string classInfo() const {
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return "Check the code for each class.\n"
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"* Missing constructors\n"
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"* Are all variables initialized by the constructors?\n"
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"* Are all variables assigned by 'operator='?\n"
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"* Warn if memset, memcpy etc are used on a class\n"
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"* If it's a base class, check that the destructor is virtual\n"
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"* Are there unused private functions?\n"
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"* 'operator=' should return reference to self\n"
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"* 'operator=' should check for assignment to self\n"
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"* Constness for member functions\n"
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"* Order of initializations\n"
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"* Suggest usage of initialization list\n"
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"* Suspicious subtraction from 'this'\n";
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}
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// operatorEqRetRefThis helper function
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void checkReturnPtrThis(const Scope *scope, const Function *func, const Token *tok, const Token *last);
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// operatorEqToSelf helper functions
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bool hasAllocation(const Function *func, const Scope* scope);
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static bool hasAssignSelf(const Function *func, const Token *rhs);
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// checkConst helper functions
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bool isMemberVar(const Scope *scope, const Token *tok);
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bool isMemberFunc(const Scope *scope, const Token *tok);
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bool isConstMemberFunc(const Scope *scope, const Token *tok);
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bool checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed);
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// constructors helper function
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/** @brief Information about a member variable. Used when checking for uninitialized variables */
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struct Usage {
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Usage() : assign(false), init(false) { }
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/** @brief has this variable been assigned? */
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bool assign;
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/** @brief has this variable been initialized? */
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bool init;
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};
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static bool isBaseClassFunc(const Token *tok, const Scope *scope);
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/**
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* @brief assign a variable in the varlist
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* @param varname name of variable to mark assigned
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* @param scope pointer to variable Scope
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* @param usage reference to usage vector
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*/
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static void assignVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage);
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/**
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* @brief initialize a variable in the varlist
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* @param varname name of variable to mark initialized
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* @param scope pointer to variable Scope
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* @param usage reference to usage vector
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*/
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static void initVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage);
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/**
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* @brief set all variables in list assigned
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* @param usage reference to usage vector
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*/
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void assignAllVar(std::vector<Usage> &usage) const;
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/**
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* @brief set all variables in list not assigned and not initialized
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* @param usage reference to usage vector
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*/
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void clearAllVar(std::vector<Usage> &usage) const;
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/**
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* @brief parse a scope for a constructor or member function and set the "init" flags in the provided varlist
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* @param func reference to the function that should be checked
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* @param callstack the function doesn't look into recursive function calls.
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* @param scope pointer to variable Scope
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* @param usage reference to usage vector
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*/
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void initializeVarList(const Function &func, std::list<std::string> &callstack, const Scope *scope, std::vector<Usage> &usage);
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bool canNotCopy(const Scope *scope) const;
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif
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