320 lines
14 KiB
C++
320 lines
14 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2016 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 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(nullptr) {
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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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if (tokenizer->isC())
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return;
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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.checkMemset();
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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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if (tokenizer->isC())
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return;
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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.checkSelfInitialization();
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checkClass.virtualDestructor();
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checkClass.checkConst();
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checkClass.copyconstructors();
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checkClass.checkPureVirtualFunctionCall();
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checkClass.checkDuplInheritedMembers();
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checkClass.checkExplicitConstructors();
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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 constructors with single parameter are explicit,
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* if they has to be.*/
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void checkExplicitConstructors();
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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 checkMemset();
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void checkMemsetType(const Scope *start, const Token *tok, const Scope *type, bool allocation, std::set<const Scope *> parsedTypes);
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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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/** @brief Suggest using initialization list */
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void initializationListUsage();
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/** @brief Check for initialization of a member with itself */
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void checkSelfInitialization();
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void copyconstructors();
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/** @brief call of pure virtual function */
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void checkPureVirtualFunctionCall();
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/** @brief Check duplicated inherited members */
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void checkDuplInheritedMembers();
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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 noExplicitConstructorError(const Token *tok, const std::string &classname, bool isStruct);
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//void copyConstructorMallocError(const Token *cctor, const Token *alloc, const std::string& var_name);
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void copyConstructorShallowCopyError(const Token *tok, const std::string& varname);
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void noCopyConstructorError(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, bool inconclusive);
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void operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname, bool inconclusive);
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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 memsetErrorReference(const Token *tok, const std::string &memfunc, const std::string &type);
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void memsetErrorFloat(const Token *tok, const std::string &type);
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void mallocOnClassError(const Token* tok, const std::string &memfunc, const Token* classTok, const std::string &classname);
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void mallocOnClassWarning(const Token* tok, const std::string &memfunc, const Token* classTok);
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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, bool inconclusive);
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void thisSubtractionError(const Token *tok);
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void operatorEqRetRefThisError(const Token *tok);
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void operatorEqShouldBeLeftUnimplementedError(const Token *tok);
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void operatorEqMissingReturnStatementError(const Token *tok, bool error);
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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 selfInitializationError(const Token* tok, const std::string& varname);
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void callsPureVirtualFunctionError(const Function & scopeFunction, const std::list<const Token *> & tokStack, const std::string &purefuncname);
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void duplInheritedMembersError(const Token* tok1, const Token* tok2, const std::string &derivedname, const std::string &basename, const std::string &variablename, bool derivedIsStruct, bool baseIsStruct);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckClass c(nullptr, settings, errorLogger);
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c.noConstructorError(nullptr, "classname", false);
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c.noExplicitConstructorError(nullptr, "classname", false);
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//c.copyConstructorMallocError(nullptr, 0, "var");
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c.copyConstructorShallowCopyError(nullptr, "var");
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c.noCopyConstructorError(nullptr, "class", false);
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c.uninitVarError(nullptr, "classname", "varname", false);
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c.operatorEqVarError(nullptr, "classname", "", false);
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c.unusedPrivateFunctionError(nullptr, "classname", "funcname");
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c.memsetError(nullptr, "memfunc", "classname", "class");
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c.memsetErrorReference(nullptr, "memfunc", "class");
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c.memsetErrorFloat(nullptr, "class");
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c.mallocOnClassWarning(nullptr, "malloc", 0);
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c.mallocOnClassError(nullptr, "malloc", 0, "std::string");
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c.operatorEqReturnError(nullptr, "class");
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c.virtualDestructorError(nullptr, "Base", "Derived", false);
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c.thisSubtractionError(nullptr);
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c.operatorEqRetRefThisError(nullptr);
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c.operatorEqMissingReturnStatementError(nullptr, true);
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c.operatorEqShouldBeLeftUnimplementedError(nullptr);
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c.operatorEqToSelfError(nullptr);
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c.checkConstError(nullptr, "class", "function", false);
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c.checkConstError(nullptr, "class", "function", true);
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c.initializerListError(nullptr, 0, "class", "variable");
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c.suggestInitializationList(nullptr, "variable");
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c.selfInitializationError(nullptr, "var");
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c.duplInheritedMembersError(nullptr, 0, "class", "class", "variable", false, false);
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}
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static std::string myName() {
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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 and copy constructors\n"
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//"- Missing allocation of memory in copy constructor\n"
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"- Constructors which should be explicit\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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"- Warn if memory for classes is allocated with malloc()\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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"- Initialization of a member with itself\n"
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"- Suspicious subtraction from 'this'\n"
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"- Call of pure virtual function in constructor/destructor\n"
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"- Duplicated inherited data members\n";
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}
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// operatorEqRetRefThis helper functions
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void checkReturnPtrThis(const Scope *scope, const Function *func, const Token *tok, const Token *last);
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void checkReturnPtrThis(const Scope *scope, const Function *func, const Token *tok, const Token *last, std::set<const Function*>& analyzedFunctions);
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// operatorEqToSelf helper functions
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bool hasAllocation(const Function *func, const Scope* scope) const;
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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) const;
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bool isMemberFunc(const Scope *scope, const Token *tok) const;
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bool isConstMemberFunc(const Scope *scope, const Token *tok) const;
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bool checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed) const;
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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 varid id 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(unsigned int varid, 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 varid id 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(unsigned int varid, 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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static void assignAllVar(std::vector<Usage> &usage);
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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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static void clearAllVar(std::vector<Usage> &usage);
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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<const Function *> &callstack, const Scope *scope, std::vector<Usage> &usage);
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/**
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* @brief gives a list of tokens where pure virtual functions are called directly or indirectly
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* @param function function to be checked
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* @param callsPureVirtualFunctionMap map of results for already checked functions
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* @return list of tokens where pure virtual functions are called
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*/
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const std::list<const Token *> & callsPureVirtualFunction(
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const Function & function,
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std::map<const Function *, std::list<const Token *> > & callsPureVirtualFunctionMap);
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/**
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* @brief looks for the first pure virtual function call stack
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* @param callsPureVirtualFunctionMap map of results obtained from callsPureVirtualFunction
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* @param pureCall token where pure virtual function is called directly or indirectly
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* @param[in,out] pureFuncStack list to append the stack
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*/
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void getFirstPureVirtualFunctionCallStack(
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std::map<const Function *, std::list<const Token *> > & callsPureVirtualFunctionMap,
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const Token & pureCall,
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std::list<const Token *> & pureFuncStack);
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static bool canNotCopy(const Scope *scope);
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static bool canNotMove(const Scope *scope);
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkclassH
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