1669 lines
58 KiB
C++
1669 lines
58 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2011 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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#include "checkclass.h"
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#include "tokenize.h"
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#include "token.h"
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#include "errorlogger.h"
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#include "symboldatabase.h"
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#include <locale>
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#include <cstring>
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#include <string>
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#include <sstream>
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#include <algorithm>
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//---------------------------------------------------------------------------
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// Register CheckClass..
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namespace
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{
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CheckClass instance;
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}
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//---------------------------------------------------------------------------
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CheckClass::CheckClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger),
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symbolDatabase(NULL)
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{
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}
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void CheckClass::createSymbolDatabase()
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{
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// Multiple calls => bail out
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if (symbolDatabase)
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return;
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symbolDatabase = _tokenizer->getSymbolDatabase();
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Check that all class constructors are ok.
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//---------------------------------------------------------------------------
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void CheckClass::constructors()
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{
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if (!_settings->_checkCodingStyle)
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return;
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createSymbolDatabase();
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std::list<Scope>::const_iterator scope;
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for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
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{
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// only check classes and structures
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if (!scope->isClassOrStruct())
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continue;
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// There are no constructors.
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if (scope->numConstructors == 0)
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{
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// If there is a private variable, there should be a constructor..
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std::list<Variable>::const_iterator var;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var)
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{
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if (var->isPrivate() && !var->isClass() && !var->isStatic())
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{
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noConstructorError(scope->classDef, scope->className, scope->classDef->str() == "struct");
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break;
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}
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}
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}
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std::list<Function>::const_iterator func;
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std::vector<Usage> usage(scope->varlist.size());
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for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
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{
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if (!func->hasBody || !(func->type == Function::eConstructor ||
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func->type == Function::eCopyConstructor ||
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func->type == Function::eOperatorEqual))
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continue;
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// Mark all variables not used
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clearAllVar(usage);
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std::list<std::string> callstack;
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initializeVarList(*func, callstack, &(*scope), usage);
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// Check if any variables are uninitialized
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count)
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{
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if (usage[count].assign || usage[count].init || var->isStatic())
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continue;
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if (var->isConst() && var->nameToken()->previous()->str() != "*")
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continue;
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// Check if this is a class constructor
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if (var->isClass() && func->type == Function::eConstructor)
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{
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// Unknown type so assume it is initialized
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if (!var->type())
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continue;
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// Known type that doesn't need initialization or
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// known type that has member variables of an unknown type
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else if (var->type()->needInitialization != Scope::True)
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continue;
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}
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// Check if type can't be copied
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if (var->type() && canNotCopy(var->type()))
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continue;
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// It's non-static and it's not initialized => error
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if (func->type == Function::eOperatorEqual)
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{
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const Token *operStart = func->token->tokAt(1);
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bool classNameUsed = false;
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for (const Token *operTok = operStart; operTok != operStart->link(); operTok = operTok->next())
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{
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if (operTok->str() == scope->className)
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{
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classNameUsed = true;
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break;
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}
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}
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if (classNameUsed)
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operatorEqVarError(func->token, scope->className, var->name());
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}
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else if (func->access != Private)
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uninitVarError(func->token, scope->className, var->name());
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}
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}
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}
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}
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bool CheckClass::canNotCopy(const Scope *scope) const
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{
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std::list<Function>::const_iterator func;
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bool privateAssign = false;
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bool privateCopy = false;
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for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
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{
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if (func->type == Function::eCopyConstructor && func->access == Private)
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privateCopy = true;
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else if (func->type == Function::eOperatorEqual && func->access == Private)
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privateAssign = true;
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}
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return privateAssign && privateCopy;
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}
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void CheckClass::assignVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage)
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{
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count)
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{
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if (var->name() == varname)
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{
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usage[count].assign = true;
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return;
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}
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}
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}
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void CheckClass::initVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage)
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{
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count)
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{
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if (var->name() == varname)
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{
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usage[count].init = true;
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return;
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}
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}
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}
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void CheckClass::assignAllVar(std::vector<Usage> &usage)
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{
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for (size_t i = 0; i < usage.size(); ++i)
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usage[i].assign = true;
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}
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void CheckClass::clearAllVar(std::vector<Usage> &usage)
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{
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for (size_t i = 0; i < usage.size(); ++i)
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{
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usage[i].assign = false;
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usage[i].init = false;
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}
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}
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bool CheckClass::isBaseClassFunc(const Token *tok, const Scope *scope)
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{
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// Iterate through each base class...
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for (size_t i = 0; i < scope->derivedFrom.size(); ++i)
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{
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const Scope *derivedFrom = scope->derivedFrom[i].scope;
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// Check if base class exists in database
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if (derivedFrom)
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{
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std::list<Function>::const_iterator func;
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for (func = derivedFrom->functionList.begin(); func != derivedFrom->functionList.end(); ++func)
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{
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if (func->tokenDef->str() == tok->str())
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return true;
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}
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}
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// Base class not found so assume it is in it.
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else
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return true;
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}
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return false;
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}
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void CheckClass::initializeVarList(const Function &func, std::list<std::string> &callstack, const Scope *scope, std::vector<Usage> &usage)
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{
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bool Assign = false;
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unsigned int indentlevel = 0;
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const Token *ftok = func.token;
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for (; ftok; ftok = ftok->next())
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{
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if (!ftok->next())
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break;
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// Class constructor.. initializing variables like this
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// clKalle::clKalle() : var(value) { }
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if (indentlevel == 0)
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{
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if (Assign && Token::Match(ftok, "%var% ("))
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{
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initVar(ftok->str(), scope, usage);
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// assignment in the initializer..
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// : var(value = x)
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if (Token::Match(ftok->tokAt(2), "%var% ="))
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assignVar(ftok->strAt(2), scope, usage);
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}
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Assign |= (ftok->str() == ":");
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}
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if (ftok->str() == "{")
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{
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++indentlevel;
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Assign = false;
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}
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else if (ftok->str() == "}")
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{
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if (indentlevel <= 1)
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break;
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--indentlevel;
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}
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if (indentlevel < 1)
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continue;
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// Variable getting value from stream?
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if (Token::Match(ftok, ">> %var%"))
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{
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assignVar(ftok->strAt(1), scope, usage);
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}
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// Before a new statement there is "[{};)=]"
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if (! Token::Match(ftok, "[{};()=]"))
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continue;
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if (Token::simpleMatch(ftok, "( !"))
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ftok = ftok->next();
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// Using the operator= function to initialize all variables..
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if (Token::simpleMatch(ftok->next(), "* this ="))
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{
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assignAllVar(usage);
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break;
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}
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// Calling member variable function?
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if (Token::Match(ftok->next(), "%var% . %var% ("))
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{
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std::list<Variable>::const_iterator var;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var)
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{
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if (var->varId() == ftok->next()->varId())
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{
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/** @todo false negative: we assume function changes variable state */
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assignVar(ftok->next()->str(), scope, usage);
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continue;
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}
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}
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ftok = ftok->tokAt(2);
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}
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if (!Token::Match(ftok->next(), "%var%") &&
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!Token::Match(ftok->next(), "this . %var%") &&
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!Token::Match(ftok->next(), "* %var% =") &&
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!Token::Match(ftok->next(), "( * this ) . %var%"))
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continue;
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// Goto the first token in this statement..
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ftok = ftok->next();
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// Skip "( * this )"
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if (Token::simpleMatch(ftok, "( * this ) ."))
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{
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ftok = ftok->tokAt(5);
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}
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// Skip "this->"
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if (Token::simpleMatch(ftok, "this ."))
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ftok = ftok->tokAt(2);
|
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|
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// Skip "classname :: "
|
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if (Token::Match(ftok, "%var% ::"))
|
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ftok = ftok->tokAt(2);
|
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|
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// Clearing all variables..
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if (Token::simpleMatch(ftok, "memset ( this ,"))
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{
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assignAllVar(usage);
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return;
|
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}
|
||
|
||
// Clearing array..
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else if (Token::Match(ftok, "memset ( %var% ,"))
|
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{
|
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assignVar(ftok->strAt(2), scope, usage);
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ftok = ftok->next()->link();
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continue;
|
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}
|
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|
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// Calling member function?
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else if (Token::simpleMatch(ftok, "operator= (") &&
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ftok->previous()->str() != "::")
|
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{
|
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// check if member function exists
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std::list<Function>::const_iterator it;
|
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for (it = scope->functionList.begin(); it != scope->functionList.end(); ++it)
|
||
{
|
||
if (ftok->str() == it->tokenDef->str() && it->type != Function::eConstructor)
|
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break;
|
||
}
|
||
|
||
// member function found
|
||
if (it != scope->functionList.end())
|
||
{
|
||
// member function has implementation
|
||
if (it->hasBody)
|
||
{
|
||
// initialize variable use list using member function
|
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callstack.push_back(ftok->str());
|
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initializeVarList(*it, callstack, scope, usage);
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callstack.pop_back();
|
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}
|
||
|
||
// there is a called member function, but it has no implementation, so we assume it initializes everything
|
||
else
|
||
{
|
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assignAllVar(usage);
|
||
}
|
||
}
|
||
|
||
// using default operator =, assume everything initialized
|
||
else
|
||
{
|
||
assignAllVar(usage);
|
||
}
|
||
}
|
||
else if (Token::Match(ftok, "%var% (") && ftok->str() != "if")
|
||
{
|
||
// Passing "this" => assume that everything is initialized
|
||
for (const Token *tok2 = ftok->next()->link(); tok2 && tok2 != ftok; tok2 = tok2->previous())
|
||
{
|
||
if (tok2->str() == "this")
|
||
{
|
||
assignAllVar(usage);
|
||
return;
|
||
}
|
||
}
|
||
|
||
// recursive call / calling overloaded function
|
||
// assume that all variables are initialized
|
||
if (std::find(callstack.begin(), callstack.end(), ftok->str()) != callstack.end())
|
||
{
|
||
assignAllVar(usage);
|
||
return;
|
||
}
|
||
|
||
// check if member function
|
||
std::list<Function>::const_iterator it;
|
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for (it = scope->functionList.begin(); it != scope->functionList.end(); ++it)
|
||
{
|
||
if (ftok->str() == it->tokenDef->str() && it->type != Function::eConstructor)
|
||
break;
|
||
}
|
||
|
||
// member function found
|
||
if (it != scope->functionList.end())
|
||
{
|
||
// member function has implementation
|
||
if (it->hasBody)
|
||
{
|
||
// initialize variable use list using member function
|
||
callstack.push_back(ftok->str());
|
||
initializeVarList(*it, callstack, scope, usage);
|
||
callstack.pop_back();
|
||
}
|
||
|
||
// there is a called member function, but it has no implementation, so we assume it initializes everything
|
||
else
|
||
{
|
||
assignAllVar(usage);
|
||
}
|
||
}
|
||
|
||
// not member function
|
||
else
|
||
{
|
||
// could be a base class virtual function, so we assume it initializes everything
|
||
if (func.type != Function::eConstructor && isBaseClassFunc(ftok, scope))
|
||
{
|
||
/** @todo False Negative: we should look at the base class functions to see if they
|
||
* call any derived class virtual functions that change the derived class state
|
||
*/
|
||
assignAllVar(usage);
|
||
}
|
||
|
||
// has friends, so we assume it initializes everything
|
||
if (!scope->friendList.empty())
|
||
assignAllVar(usage);
|
||
|
||
// the function is external and it's neither friend nor inherited virtual function.
|
||
// assume all variables that are passed to it are initialized..
|
||
else
|
||
{
|
||
unsigned int indentlevel2 = 0;
|
||
for (const Token *tok = ftok->tokAt(2); tok; tok = tok->next())
|
||
{
|
||
if (tok->str() == "(")
|
||
++indentlevel2;
|
||
else if (tok->str() == ")")
|
||
{
|
||
if (indentlevel2 == 0)
|
||
break;
|
||
--indentlevel2;
|
||
}
|
||
if (tok->isName())
|
||
{
|
||
assignVar(tok->str(), scope, usage);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Assignment of member variable?
|
||
else if (Token::Match(ftok, "%var% ="))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
|
||
// Assignment of array item of member variable?
|
||
else if (Token::Match(ftok, "%var% [ %any% ] ="))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
|
||
// Assignment of member of array item of member variable?
|
||
else if (Token::Match(ftok, "%var% [ %any% ] . %var% =") ||
|
||
Token::Match(ftok, "%var% [ %any% ] . %var% . %var% ="))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
|
||
// Assignment of array item of member variable?
|
||
else if (Token::Match(ftok, "%var% [ %any% ] [ %any% ] ="))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
|
||
// Assignment of array item of member variable?
|
||
else if (Token::Match(ftok, "* %var% ="))
|
||
{
|
||
assignVar(ftok->next()->str(), scope, usage);
|
||
}
|
||
|
||
// Assignment of struct member of member variable?
|
||
else if (Token::Match(ftok, "%var% . %any% ="))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
|
||
// The functions 'clear' and 'Clear' are supposed to initialize variable.
|
||
if (Token::Match(ftok, "%var% . clear|Clear ("))
|
||
{
|
||
assignVar(ftok->str(), scope, usage);
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::noConstructorError(const Token *tok, const std::string &classname, bool isStruct)
|
||
{
|
||
// For performance reasons the constructor might be intentionally missing. Therefore this is not a "warning"
|
||
reportError(tok, Severity::style, "noConstructor",
|
||
"The " + std::string(isStruct ? "struct" : "class") + " '" + classname +
|
||
"' does not have a constructor.\n"
|
||
"The " + std::string(isStruct ? "struct" : "class") + " '" + classname +
|
||
" 'does not have a constructor but it has attributes. "
|
||
"The attributes are not initialized which may cause bugs or undefined behavior.");
|
||
}
|
||
|
||
void CheckClass::uninitVarError(const Token *tok, const std::string &classname, const std::string &varname)
|
||
{
|
||
reportError(tok, Severity::warning, "uninitVar", "Member variable '" + classname + "::" + varname + "' is not initialised in the constructor.");
|
||
}
|
||
|
||
void CheckClass::operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname)
|
||
{
|
||
reportError(tok, Severity::warning, "operatorEqVarError", "Member variable '" + classname + "::" + varname + "' is not assigned a value in '" + classname + "::operator=" + "'");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// ClassCheck: Unused private functions
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::privateFunctions()
|
||
{
|
||
if (!_settings->_checkCodingStyle)
|
||
return;
|
||
|
||
// don't check code that contains templates. Templates that are
|
||
// "unused" are removed from the code. #2067
|
||
if (_tokenizer->codeWithTemplates())
|
||
return;
|
||
|
||
// dont check borland classes with properties..
|
||
if (Token::findmatch(_tokenizer->tokens(), "; __property ;"))
|
||
return;
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
// only check classes and structures
|
||
if (!scope->isClassOrStruct())
|
||
continue;
|
||
|
||
// don’t check derived classes
|
||
if (!scope->derivedFrom.empty())
|
||
continue;
|
||
|
||
// skip checking if there are friends
|
||
if (!scope->friendList.empty())
|
||
continue;
|
||
|
||
// Locate some class
|
||
const Token *tok1 = scope->classDef;
|
||
|
||
// check that the whole class implementation is seen
|
||
bool whole = true;
|
||
std::list<Function>::const_iterator func;
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
if (!func->hasBody)
|
||
{
|
||
// empty private copy constructors and assignment operators are OK
|
||
if ((func->type == Function::eCopyConstructor ||
|
||
func->type == Function::eOperatorEqual) &&
|
||
func->access == Private)
|
||
continue;
|
||
|
||
whole = false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!whole)
|
||
continue;
|
||
|
||
const std::string &classname = tok1->next()->str();
|
||
|
||
std::list<const Token *> FuncList;
|
||
/** @todo embedded class have access to private functions */
|
||
if (!scope->getNestedNonFunctions())
|
||
{
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
// Get private functions..
|
||
if (func->type == Function::eFunction && func->access == Private)
|
||
FuncList.push_back(func->tokenDef);
|
||
}
|
||
}
|
||
|
||
// Check that all private functions are used..
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
const Token *ftok = func->start;
|
||
if (ftok)
|
||
{
|
||
const Token *etok = ftok->link();
|
||
|
||
for (; ftok != etok; ftok = ftok->next())
|
||
{
|
||
if (Token::Match(ftok, "%var% ("))
|
||
{
|
||
// Remove function from FuncList
|
||
std::list<const Token *>::iterator it = FuncList.begin();
|
||
while (it != FuncList.end())
|
||
{
|
||
if (ftok->str() == (*it)->str())
|
||
FuncList.erase(it++);
|
||
else
|
||
++it;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
while (!FuncList.empty())
|
||
{
|
||
// Final check; check if the function pointer is used somewhere..
|
||
const std::string _pattern("return|(|)|,|= " + FuncList.front()->str());
|
||
|
||
// or if the function address is used somewhere...
|
||
// eg. sigc::mem_fun(this, &className::classFunction)
|
||
const std::string _pattern2("& " + classname + " :: " + FuncList.front()->str());
|
||
const std::string methodAsArgument("(|, " + classname + " :: " + FuncList.front()->str() + " ,|)");
|
||
if (!Token::findmatch(_tokenizer->tokens(), _pattern.c_str()) &&
|
||
!Token::findmatch(_tokenizer->tokens(), _pattern2.c_str()) &&
|
||
!Token::findmatch(_tokenizer->tokens(), methodAsArgument.c_str())
|
||
)
|
||
{
|
||
unusedPrivateFunctionError(FuncList.front(), classname, FuncList.front()->str());
|
||
}
|
||
FuncList.pop_front();
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::unusedPrivateFunctionError(const Token *tok, const std::string &classname, const std::string &funcname)
|
||
{
|
||
reportError(tok, Severity::style, "unusedPrivateFunction", "Unused private function '" + classname + "::" + funcname + "'");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// ClassCheck: Check that memset is not used on classes
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::checkMemsetType(const Scope *start, const Token *tok, const Token *typeTok)
|
||
{
|
||
// Warn if type is a class or struct that contains any std::* variables
|
||
const Scope *scope = symbolDatabase->findVariableType(start, typeTok);
|
||
if (!scope)
|
||
return;
|
||
|
||
const Token *tstruct = scope->classDef;
|
||
const std::string &typeName = tstruct->str();
|
||
|
||
if (tstruct->tokAt(2)->str() == ":")
|
||
{
|
||
tstruct = tstruct->tokAt(3);
|
||
for (; tstruct; tstruct = tstruct->next())
|
||
{
|
||
while (Token::Match(tstruct, "public|private|protected|virtual"))
|
||
{
|
||
tstruct = tstruct->next();
|
||
}
|
||
|
||
// recursively check all parent classes
|
||
checkMemsetType(start, tok, tstruct);
|
||
|
||
tstruct = tstruct->next();
|
||
if (tstruct->str() != ",")
|
||
break;
|
||
}
|
||
}
|
||
|
||
for (; tstruct; tstruct = tstruct->next())
|
||
{
|
||
if (tstruct->str() == "}")
|
||
break;
|
||
|
||
// struct with function? skip function body..
|
||
if (Token::simpleMatch(tstruct, ") {"))
|
||
{
|
||
tstruct = tstruct->next()->link();
|
||
if (!tstruct)
|
||
break;
|
||
}
|
||
|
||
// before a statement there must be either:
|
||
// * private:|protected:|public:
|
||
// * { } ;
|
||
if (Token::Match(tstruct, "[;{}]") ||
|
||
tstruct->str().find(":") != std::string::npos)
|
||
{
|
||
if (Token::Match(tstruct->next(), "std :: %type% %var% ;"))
|
||
memsetError(tok, tok->str(), "'std::" + tstruct->strAt(3) + "'", typeName);
|
||
|
||
else if (Token::Match(tstruct->next(), "std :: %type% <"))
|
||
{
|
||
// backup the type
|
||
const std::string typestr(tstruct->strAt(3));
|
||
|
||
// check if it's a pointer variable..
|
||
unsigned int level = 0;
|
||
while (0 != (tstruct = tstruct->next()))
|
||
{
|
||
if (tstruct->str() == "<")
|
||
++level;
|
||
else if (tstruct->str() == ">")
|
||
{
|
||
if (level <= 1)
|
||
break;
|
||
--level;
|
||
}
|
||
else if (tstruct->str() == "(")
|
||
tstruct = tstruct->link();
|
||
}
|
||
|
||
if (!tstruct)
|
||
break;
|
||
|
||
// found error => report
|
||
if (Token::Match(tstruct, "> %var% ;"))
|
||
memsetError(tok, tok->str(), "'std::" + typestr + "'", typeName);
|
||
}
|
||
else if (Token::simpleMatch(tstruct->next(), "virtual"))
|
||
memsetError(tok, tok->str(), "virtual method", typeName);
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::noMemset()
|
||
{
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
std::list<Function>::const_iterator func;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
// only check functions with bodies
|
||
if (!func->hasBody)
|
||
continue;
|
||
|
||
// Locate all 'memset' tokens..
|
||
const Token *end = func->start->link();
|
||
for (const Token *tok = func->start; tok && tok != end; tok = tok->next())
|
||
{
|
||
if (!Token::Match(tok, "memset|memcpy|memmove"))
|
||
continue;
|
||
|
||
const Token *typeTok = 0;
|
||
if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
|
||
typeTok = tok->tokAt(8);
|
||
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
|
||
typeTok = tok->tokAt(9);
|
||
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %type% :: %type% ) )"))
|
||
typeTok = tok->tokAt(11);
|
||
else if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
|
||
typeTok = tok->tokAt(9);
|
||
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
|
||
typeTok = tok->tokAt(10);
|
||
else if (Token::Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
|
||
typeTok = tok->tokAt(8);
|
||
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %var% ) )"))
|
||
{
|
||
unsigned int varid = tok->tokAt(3)->varId();
|
||
const Variable *var = symbolDatabase->getVariableFromVarId(varid);
|
||
if (var && (var->typeStartToken() == var->typeEndToken() ||
|
||
Token::Match(var->typeStartToken(), "%type% :: %type%")))
|
||
typeTok = var->typeEndToken();
|
||
}
|
||
|
||
// No type defined => The tokens didn't match
|
||
if (!typeTok)
|
||
continue;
|
||
|
||
checkMemsetType(&(*scope), tok, typeTok);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::memsetError(const Token *tok, const std::string &memfunc, const std::string &classname, const std::string &type)
|
||
{
|
||
reportError(tok, Severity::error, "memsetClass", "Using '" + memfunc + "' on " + type + " that contains a " + classname);
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// ClassCheck: "void operator=(" and "const type & operator=("
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::operatorEq()
|
||
{
|
||
if (!_settings->_checkCodingStyle)
|
||
return;
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
std::list<Function>::const_iterator func;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
if (func->type == Function::eOperatorEqual && func->access != Private)
|
||
{
|
||
if (func->token->strAt(-1) == "void")
|
||
operatorEqReturnError(func->token->tokAt(-1));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::operatorEqReturnError(const Token *tok)
|
||
{
|
||
reportError(tok, Severity::style, "operatorEq", "'operator=' should return something");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// ClassCheck: "C& operator=(const C&) { ... return *this; }"
|
||
// operator= should return a reference to *this
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::checkReturnPtrThis(const Scope *scope, const Function *func, const Token *tok, const Token *last)
|
||
{
|
||
bool foundReturn = false;
|
||
|
||
for (; tok && tok != last; tok = tok->next())
|
||
{
|
||
// check for return of reference to this
|
||
if (tok->str() == "return")
|
||
{
|
||
foundReturn = true;
|
||
std::string cast("( " + scope->className + " & )");
|
||
if (Token::Match(tok->next(), cast.c_str()))
|
||
tok = tok->tokAt(4);
|
||
|
||
// check if a function is called
|
||
if (Token::Match(tok->tokAt(1), "%any% (") &&
|
||
tok->tokAt(2)->link()->next()->str() == ";")
|
||
{
|
||
std::list<Function>::const_iterator it;
|
||
|
||
// check if it is a member function
|
||
for (it = scope->functionList.begin(); it != scope->functionList.end(); ++it)
|
||
{
|
||
// check for a regular function with the same name and a body
|
||
if (it->type == Function::eFunction && it->hasBody &&
|
||
it->token->str() == tok->next()->str())
|
||
{
|
||
// check for the proper return type
|
||
if (it->tokenDef->previous()->str() == "&" &&
|
||
it->tokenDef->strAt(-2) == scope->className)
|
||
{
|
||
// make sure it's not a const function
|
||
if (it->arg->link()->next()->str() != "const")
|
||
{
|
||
/** @todo make sure argument types match */
|
||
// make sure it's not the same function
|
||
if (&*it != func)
|
||
checkReturnPtrThis(scope, &*it, it->arg->link()->next(), it->arg->link()->next()->link());
|
||
|
||
// just bail for now
|
||
else
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// check if *this is returned
|
||
else if (!(Token::Match(tok->tokAt(1), "(| * this ;|=") ||
|
||
Token::Match(tok->tokAt(1), "(| * this +=") ||
|
||
Token::simpleMatch(tok->tokAt(1), "operator= (") ||
|
||
(Token::Match(tok->tokAt(1), "%type% :: operator= (") &&
|
||
tok->next()->str() == scope->className)))
|
||
operatorEqRetRefThisError(func->token);
|
||
}
|
||
}
|
||
if (!foundReturn)
|
||
operatorEqRetRefThisError(func->token);
|
||
}
|
||
|
||
void CheckClass::operatorEqRetRefThis()
|
||
{
|
||
if (!_settings->_checkCodingStyle)
|
||
return;
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
// only check classes and structures
|
||
if (scope->isClassOrStruct())
|
||
{
|
||
std::list<Function>::const_iterator func;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
if (func->type == Function::eOperatorEqual && func->hasBody)
|
||
{
|
||
// make sure return signature is correct
|
||
if (Token::Match(func->tokenDef->tokAt(-3), ";|}|{|public:|protected:|private: %type% &") &&
|
||
func->tokenDef->strAt(-2) == scope->className)
|
||
{
|
||
// find the ')'
|
||
const Token *tok = func->token->next()->link();
|
||
|
||
checkReturnPtrThis(&(*scope), &(*func), tok->tokAt(2), tok->next()->link());
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::operatorEqRetRefThisError(const Token *tok)
|
||
{
|
||
reportError(tok, Severity::style, "operatorEqRetRefThis", "'operator=' should return reference to self");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// ClassCheck: "C& operator=(const C& rhs) { if (this == &rhs) ... }"
|
||
// operator= should check for assignment to self
|
||
//
|
||
// For simple classes, an assignment to self check is only a potential optimization.
|
||
//
|
||
// For classes that allocate dynamic memory, assignment to self can be a real error
|
||
// if it is deallocated and allocated again without being checked for.
|
||
//
|
||
// This check is not valid for classes with multiple inheritance because a
|
||
// class can have multiple addresses so there is no trivial way to check for
|
||
// assignment to self.
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::operatorEqToSelf()
|
||
{
|
||
if (!_settings->_checkCodingStyle)
|
||
return;
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
std::list<Function>::const_iterator func;
|
||
|
||
// skip classes with multiple inheritance
|
||
if (scope->derivedFrom.size() > 1)
|
||
continue;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
if (func->type == Function::eOperatorEqual && func->hasBody)
|
||
{
|
||
// make sure return signature is correct
|
||
if (Token::Match(func->tokenDef->tokAt(-3), ";|}|{|public:|protected:|private: %type% &") &&
|
||
func->tokenDef->strAt(-2) == scope->className)
|
||
{
|
||
// check for proper function parameter signature
|
||
if ((Token::Match(func->tokenDef->next(), "( const %var% & )") ||
|
||
Token::Match(func->tokenDef->next(), "( const %var% & %var% )")) &&
|
||
func->tokenDef->strAt(3) == scope->className)
|
||
{
|
||
// find the parameter name
|
||
const Token *rhs = func->token;
|
||
while (rhs->str() != "&")
|
||
rhs = rhs->next();
|
||
rhs = rhs->next();
|
||
|
||
// find the ')'
|
||
const Token *tok = func->token->next()->link();
|
||
const Token *tok1 = tok;
|
||
|
||
if (tok1 && tok1->tokAt(1) && tok1->tokAt(1)->str() == "{" && tok1->tokAt(1)->link())
|
||
{
|
||
const Token *first = tok1->tokAt(1);
|
||
const Token *last = first->link();
|
||
|
||
if (!hasAssignSelf(first, last, rhs))
|
||
{
|
||
if (hasDeallocation(first, last))
|
||
operatorEqToSelfError(tok);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
bool CheckClass::hasDeallocation(const Token *first, const Token *last)
|
||
{
|
||
// This function is called when no simple check was found for assignment
|
||
// to self. We are currently looking for a specific sequence of:
|
||
// deallocate member ; ... member = allocate
|
||
// This check is far from ideal because it can cause false negatives.
|
||
// Unfortunately, this is necessary to prevent false positives.
|
||
// This check needs to do careful analysis someday to get this
|
||
// correct with a high degree of certainty.
|
||
for (const Token *tok = first; tok && (tok != last); tok = tok->next())
|
||
{
|
||
// check for deallocating memory
|
||
if (Token::Match(tok, "{|;|, free ( %var%"))
|
||
{
|
||
const Token *var = tok->tokAt(3);
|
||
|
||
// we should probably check that var is a pointer in this class
|
||
|
||
const Token *tok1 = tok->tokAt(4);
|
||
|
||
while (tok1 && (tok1 != last))
|
||
{
|
||
if (Token::Match(tok1, "%var% ="))
|
||
{
|
||
if (tok1->str() == var->str())
|
||
return true;
|
||
}
|
||
|
||
tok1 = tok1->next();
|
||
}
|
||
}
|
||
else if (Token::Match(tok, "{|;|, delete [ ] %var%"))
|
||
{
|
||
const Token *var = tok->tokAt(4);
|
||
|
||
// we should probably check that var is a pointer in this class
|
||
|
||
const Token *tok1 = tok->tokAt(5);
|
||
|
||
while (tok1 && (tok1 != last))
|
||
{
|
||
if (Token::Match(tok1, "%var% = new %type% ["))
|
||
{
|
||
if (tok1->str() == var->str())
|
||
return true;
|
||
}
|
||
|
||
tok1 = tok1->next();
|
||
}
|
||
}
|
||
else if (Token::Match(tok, "{|;|, delete %var%"))
|
||
{
|
||
const Token *var = tok->tokAt(2);
|
||
|
||
// we should probably check that var is a pointer in this class
|
||
|
||
const Token *tok1 = tok->tokAt(3);
|
||
|
||
while (tok1 && (tok1 != last))
|
||
{
|
||
if (Token::Match(tok1, "%var% = new"))
|
||
{
|
||
if (tok1->str() == var->str())
|
||
return true;
|
||
}
|
||
|
||
tok1 = tok1->next();
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool CheckClass::hasAssignSelf(const Token *first, const Token *last, const Token *rhs)
|
||
{
|
||
for (const Token *tok = first; tok && tok != last; tok = tok->next())
|
||
{
|
||
if (Token::simpleMatch(tok, "if ("))
|
||
{
|
||
const Token *tok1 = tok->tokAt(2);
|
||
const Token *tok2 = tok->tokAt(1)->link();
|
||
|
||
if (tok1 && tok2)
|
||
{
|
||
for (; tok1 && tok1 != tok2; tok1 = tok1->next())
|
||
{
|
||
if (Token::Match(tok1, "this ==|!= & %var%"))
|
||
{
|
||
if (tok1->tokAt(3)->str() == rhs->str())
|
||
return true;
|
||
}
|
||
else if (Token::Match(tok1, "& %var% ==|!= this"))
|
||
{
|
||
if (tok1->tokAt(1)->str() == rhs->str())
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
void CheckClass::operatorEqToSelfError(const Token *tok)
|
||
{
|
||
reportError(tok, Severity::warning, "operatorEqToSelf", "'operator=' should check for assignment to self");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// A destructor in a base class should be virtual
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::virtualDestructor()
|
||
{
|
||
// This error should only be given if:
|
||
// * base class doesn't have virtual destructor
|
||
// * derived class has non-empty destructor
|
||
// * base class is deleted
|
||
if (!_settings->inconclusive)
|
||
return;
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
// Skip base classes and namespaces
|
||
if (scope->derivedFrom.empty())
|
||
continue;
|
||
|
||
// Find the destructor
|
||
const Function *destructor = scope->getDestructor();
|
||
|
||
// Check for destructor with implementation
|
||
if (!destructor || !destructor->hasBody)
|
||
continue;
|
||
|
||
// Empty destructor
|
||
if (destructor->token->tokAt(3)->link() == destructor->token->tokAt(4))
|
||
continue;
|
||
|
||
const Token *derived = scope->classDef;
|
||
const Token *derivedClass = derived->tokAt(1);
|
||
|
||
// Iterate through each base class...
|
||
for (unsigned int j = 0; j < scope->derivedFrom.size(); ++j)
|
||
{
|
||
// Check if base class is public and exists in database
|
||
if (scope->derivedFrom[j].access != Private && scope->derivedFrom[j].scope)
|
||
{
|
||
const Scope *derivedFrom = scope->derivedFrom[j].scope;
|
||
|
||
// Name of base class..
|
||
const std::string baseName = derivedFrom->className;
|
||
|
||
// Find the destructor declaration for the base class.
|
||
const Function *base_destructor = derivedFrom->getDestructor();
|
||
const Token *base = 0;
|
||
if (base_destructor)
|
||
base = base_destructor->token;
|
||
|
||
// Check that there is a destructor..
|
||
if (!base_destructor)
|
||
{
|
||
if (derivedFrom->derivedFrom.empty())
|
||
virtualDestructorError(derivedFrom->classDef, baseName, derivedClass->str());
|
||
}
|
||
else if (!base_destructor->isVirtual)
|
||
{
|
||
// TODO: This is just a temporary fix, better solution is needed.
|
||
// Skip situations where base class has base classes of its own, because
|
||
// some of the base classes might have virtual destructor.
|
||
// Proper solution is to check all of the base classes. If base class is not
|
||
// found or if one of the base classes has virtual destructor, error should not
|
||
// be printed. See TODO test case "virtualDestructorInherited"
|
||
if (derivedFrom->derivedFrom.empty())
|
||
{
|
||
// Make sure that the destructor is public (protected or private
|
||
// would not compile if inheritance is used in a way that would
|
||
// cause the bug we are trying to find here.)
|
||
if (base_destructor->access == Public)
|
||
virtualDestructorError(base, baseName, derivedClass->str());
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void CheckClass::virtualDestructorError(const Token *tok, const std::string &Base, const std::string &Derived)
|
||
{
|
||
reportError(tok, Severity::error, "virtualDestructor", "Class " + Base + " which is inherited by class " + Derived + " does not have a virtual destructor");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// warn for "this-x". The indented code may be "this->x"
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::thisSubtraction()
|
||
{
|
||
if (!_settings->_checkCodingStyle)
|
||
return;
|
||
|
||
const Token *tok = _tokenizer->tokens();
|
||
for (;;)
|
||
{
|
||
tok = Token::findmatch(tok, "this - %var%");
|
||
if (!tok)
|
||
break;
|
||
|
||
if (!Token::simpleMatch(tok->previous(), "*"))
|
||
thisSubtractionError(tok);
|
||
|
||
tok = tok->next();
|
||
}
|
||
}
|
||
|
||
void CheckClass::thisSubtractionError(const Token *tok)
|
||
{
|
||
reportError(tok, Severity::warning, "thisSubtraction", "Suspicious pointer subtraction");
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
// can member function be const?
|
||
//---------------------------------------------------------------------------
|
||
|
||
void CheckClass::checkConst()
|
||
{
|
||
if (!_settings->isEnabled("information") || _settings->ifcfg)
|
||
return;
|
||
|
||
// Don't check C# and JAVA classes
|
||
if (_tokenizer->isJavaOrCSharp())
|
||
{
|
||
return;
|
||
}
|
||
|
||
createSymbolDatabase();
|
||
|
||
std::list<Scope>::const_iterator scope;
|
||
|
||
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
||
{
|
||
// only check classes and structures
|
||
if (!scope->isClassOrStruct())
|
||
continue;
|
||
|
||
std::list<Function>::const_iterator func;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
// does the function have a body?
|
||
if (func->type == Function::eFunction && func->hasBody && !func->isFriend && !func->isStatic && !func->isConst && !func->isVirtual)
|
||
{
|
||
// get last token of return type
|
||
const Token *previous = func->tokenDef->isName() ? func->token->previous() : func->token->tokAt(-2);
|
||
while (previous && previous->str() == "::")
|
||
previous = previous->tokAt(-2);
|
||
|
||
// does the function return a pointer or reference?
|
||
if (Token::Match(previous, "*|&"))
|
||
{
|
||
const Token *temp = func->token->previous();
|
||
|
||
while (!Token::Match(temp->previous(), ";|}|{|public:|protected:|private:"))
|
||
temp = temp->previous();
|
||
|
||
if (temp->str() != "const")
|
||
continue;
|
||
}
|
||
else if (Token::Match(previous->previous(), "*|& >"))
|
||
{
|
||
const Token *temp = func->token->previous();
|
||
|
||
while (!Token::Match(temp->previous(), ";|}|{|public:|protected:|private:"))
|
||
{
|
||
temp = temp->previous();
|
||
if (temp->str() == "const")
|
||
break;
|
||
}
|
||
|
||
if (temp->str() != "const")
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
// don't warn for unknown types..
|
||
// LPVOID, HDC, etc
|
||
if (previous->isName())
|
||
{
|
||
bool allupper = true;
|
||
const std::string s(previous->str());
|
||
for (std::string::size_type pos = 0; pos < s.size(); ++pos)
|
||
{
|
||
const char ch = s[pos];
|
||
if (!(ch == '_' || (ch >= 'A' && ch <= 'Z')))
|
||
{
|
||
allupper = false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (allupper && previous->str().size() > 2)
|
||
continue;
|
||
}
|
||
}
|
||
|
||
const Token *paramEnd = func->arg->link();
|
||
|
||
// check if base class function is virtual
|
||
if (!scope->derivedFrom.empty())
|
||
{
|
||
if (isVirtualFunc(&(*scope), func->tokenDef))
|
||
continue;
|
||
}
|
||
|
||
// if nothing non-const was found. write error..
|
||
if (checkConstFunc(&(*scope), paramEnd))
|
||
{
|
||
std::string classname = scope->className;
|
||
const Scope *nest = scope->nestedIn;
|
||
while (nest && nest->type != Scope::eGlobal)
|
||
{
|
||
classname = std::string(nest->className + "::" + classname);
|
||
nest = nest->nestedIn;
|
||
}
|
||
|
||
// get function name
|
||
std::string functionName((func->tokenDef->isName() ? "" : "operator") + func->tokenDef->str());
|
||
|
||
if (func->tokenDef->str() == "(")
|
||
functionName += ")";
|
||
else if (func->tokenDef->str() == "[")
|
||
functionName += "]";
|
||
|
||
if (func->isInline)
|
||
checkConstError(func->token, classname, functionName);
|
||
else // not inline
|
||
checkConstError2(func->token, func->tokenDef, classname, functionName);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
bool CheckClass::isMemberVar(const Scope *scope, const Token *tok)
|
||
{
|
||
const Token *tok1 = tok;
|
||
|
||
while (tok->previous() && !Token::Match(tok->previous(), "}|{|;(||public:|protected:|private:|return|:|?"))
|
||
{
|
||
if (Token::simpleMatch(tok->previous(), "* this"))
|
||
return true;
|
||
|
||
tok = tok->previous();
|
||
}
|
||
|
||
if (tok->str() == "this")
|
||
return true;
|
||
|
||
if (Token::Match(tok, "( * %var% ) [") || (Token::Match(tok, "( * %var% ) <<") && tok1->next()->str() == "<<"))
|
||
tok = tok->tokAt(2);
|
||
|
||
// ignore class namespace
|
||
if (tok->str() == scope->className && tok->next()->str() == "::")
|
||
tok = tok->tokAt(2);
|
||
|
||
std::list<Variable>::const_iterator var;
|
||
for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var)
|
||
{
|
||
if (var->name() == tok->str())
|
||
{
|
||
return !var->isMutable();
|
||
}
|
||
}
|
||
|
||
// not found in this class
|
||
if (!scope->derivedFrom.empty())
|
||
{
|
||
// check each base class
|
||
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i)
|
||
{
|
||
// find the base class
|
||
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
||
|
||
// find the function in the base class
|
||
if (derivedFrom)
|
||
{
|
||
if (isMemberVar(derivedFrom, tok))
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool CheckClass::isConstMemberFunc(const Scope *scope, const Token *tok)
|
||
{
|
||
std::list<Function>::const_iterator func;
|
||
|
||
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func)
|
||
{
|
||
if (func->tokenDef->str() == tok->str() && func->isConst)
|
||
return true;
|
||
}
|
||
|
||
// not found in this class
|
||
if (!scope->derivedFrom.empty())
|
||
{
|
||
// check each base class
|
||
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i)
|
||
{
|
||
// find the base class
|
||
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
||
|
||
// find the function in the base class
|
||
if (derivedFrom)
|
||
{
|
||
if (isConstMemberFunc(derivedFrom, tok))
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool CheckClass::checkConstFunc(const Scope *scope, const Token *tok)
|
||
{
|
||
// if the function doesn't have any assignment nor function call,
|
||
// it can be a const function..
|
||
unsigned int indentlevel = 0;
|
||
bool isconst = true;
|
||
for (const Token *tok1 = tok; tok1; tok1 = tok1->next())
|
||
{
|
||
if (tok1->str() == "{")
|
||
++indentlevel;
|
||
else if (tok1->str() == "}")
|
||
{
|
||
if (indentlevel <= 1)
|
||
break;
|
||
--indentlevel;
|
||
}
|
||
|
||
// assignment.. = += |= ..
|
||
else if (tok1->str() == "=" ||
|
||
(tok1->str().find("=") == 1 &&
|
||
tok1->str().find_first_of("<!>") == std::string::npos))
|
||
{
|
||
if (tok1->previous()->varId() == 0 && !scope->derivedFrom.empty())
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
else if (isMemberVar(scope, tok1->previous()))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
else if (tok1->previous()->str() == "]")
|
||
{
|
||
// TODO: I assume that the assigned variable is a member variable
|
||
// don't assume it
|
||
isconst = false;
|
||
break;
|
||
}
|
||
else if (tok1->next()->str() == "this")
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
|
||
// FIXME: I assume that a member union/struct variable is assigned.
|
||
else if (Token::Match(tok1->tokAt(-2), ". %var%"))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
// streaming: <<
|
||
else if (tok1->str() == "<<" && isMemberVar(scope, tok1->previous()))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
else if (Token::simpleMatch(tok1->previous(), ") <<") &&
|
||
isMemberVar(scope, tok1->tokAt(-2)))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
|
||
// increment/decrement (member variable?)..
|
||
else if (Token::Match(tok1, "++|--"))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
|
||
// function call..
|
||
else if (Token::Match(tok1, "%var% (") &&
|
||
!(Token::Match(tok1, "return|c_str|if|string") || tok1->isStandardType()))
|
||
{
|
||
if (!isConstMemberFunc(scope, tok1))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
}
|
||
else if (Token::Match(tok1, "%var% < %any% > ("))
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
|
||
// delete..
|
||
else if (tok1->str() == "delete")
|
||
{
|
||
isconst = false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return isconst;
|
||
}
|
||
|
||
//---------------------------------------------------------------------------
|
||
|
||
// check if this function is defined virtual in the base classes
|
||
bool CheckClass::isVirtualFunc(const Scope *scope, const Token *functionToken) const
|
||
{
|
||
// check each base class
|
||
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i)
|
||
{
|
||
// check if base class exists in database
|
||
if (scope->derivedFrom[i].scope)
|
||
{
|
||
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
||
|
||
std::list<Function>::const_iterator func;
|
||
|
||
// check if function defined in base class
|
||
for (func = derivedFrom->functionList.begin(); func != derivedFrom->functionList.end(); ++func)
|
||
{
|
||
if (func->isVirtual)
|
||
{
|
||
const Token *tok = func->tokenDef;
|
||
|
||
if (tok->str() == functionToken->str())
|
||
{
|
||
const Token *temp1 = tok->previous();
|
||
const Token *temp2 = functionToken->previous();
|
||
bool returnMatch = true;
|
||
|
||
// check for matching return parameters
|
||
while (temp1->str() != "virtual")
|
||
{
|
||
if (temp1->str() != temp2->str())
|
||
{
|
||
returnMatch = false;
|
||
break;
|
||
}
|
||
|
||
temp1 = temp1->previous();
|
||
temp2 = temp2->previous();
|
||
}
|
||
|
||
// check for matching function parameters
|
||
if (returnMatch && symbolDatabase->argsMatch(scope, tok->tokAt(2), functionToken->tokAt(2), std::string(""), 0))
|
||
{
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!derivedFrom->derivedFrom.empty())
|
||
{
|
||
if (isVirtualFunc(derivedFrom, functionToken))
|
||
return true;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
// unable to find base class so assume it has a virtual function
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
void CheckClass::checkConstError(const Token *tok, const std::string &classname, const std::string &funcname)
|
||
{
|
||
reportError(tok, Severity::information, "functionConst",
|
||
"Technically the member function '" + classname + "::" + funcname + "' can be const.\n"
|
||
"The member function '" + classname + "::" + funcname + "' can be made a const "
|
||
"function. Making this function const function should not cause compiler errors. "
|
||
"Even though the function can be made const function technically it may not make "
|
||
"sense conceptually. Think about your design and task of the function first - is "
|
||
"it a function that must not change object internal state?");
|
||
}
|
||
|
||
void CheckClass::checkConstError2(const Token *tok1, const Token *tok2, const std::string &classname, const std::string &funcname)
|
||
{
|
||
std::list<const Token *> toks;
|
||
toks.push_back(tok1);
|
||
toks.push_back(tok2);
|
||
reportError(toks, Severity::information, "functionConst",
|
||
"Technically the member function '" + classname + "::" + funcname + "' can be const.\n"
|
||
"The member function '" + classname + "::" + funcname + "' can be made a const "
|
||
"function. Making this function const function should not cause compiler errors. "
|
||
"Even though the function can be made const function technically it may not make "
|
||
"sense conceptually. Think about your design and task of the function first - is "
|
||
"it a function that must not change object internal state?");
|
||
}
|