689 lines
23 KiB
C++
689 lines
23 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam,
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* Leandro Penz, Kimmo Varis, Vesa Pikki
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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 <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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CheckClass::CheckClass(const Tokenizer *tokenizer, const Settings &settings, ErrorLogger *errorLogger)
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{
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_tokenizer = tokenizer;
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_settings = settings;
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_errorLogger = errorLogger;
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}
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CheckClass::~CheckClass()
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{
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}
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//---------------------------------------------------------------------------
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struct CheckClass::VAR *CheckClass::ClassChecking_GetVarList(const Token *tok1)
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{
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// Get variable list..
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struct VAR *varlist = NULL;
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unsigned int indentlevel = 0;
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for (const Token *tok = tok1; tok; tok = tok->next())
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{
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if (!tok->next())
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break;
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if (tok->str() == "{")
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++indentlevel;
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else if (tok->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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// "private:" "public:" "protected:" etc
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bool b = bool((*tok->strAt(0) != ':') && strchr(tok->strAt(0), ':') != 0);
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// Search for start of statement..
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if (! Token::Match(tok, "[;{}]") && ! b)
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continue;
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// This is the start of a statement
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const Token *next = tok->next();
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const char *varname = 0;
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// If next token contains a ":".. it is not part of a variable declaration
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if (next->str().find(":") != std::string::npos)
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{
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}
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// Is it a variable declaration?
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else if (Token::Match(next, "%type% %var% ;"))
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{
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if (next->isStandardType())
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varname = next->strAt(1);
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else if (Token::findmatch(_tokenizer->tokens(), ("enum " + next->str()).c_str()))
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varname = next->strAt(1);
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}
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// Pointer?
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else if (Token::Match(next, "%type% * %var% ;"))
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{
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varname = next->strAt(2);
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}
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// Pointer?
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else if (Token::Match(next, "%type% %type% * %var% ;"))
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{
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varname = next->strAt(3);
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}
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// If the varname was set in one of the two if-block above, create a entry for this variable..
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if (varname)
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{
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struct VAR *var = new VAR(varname, false, varlist);
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varlist = var;
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}
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}
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return varlist;
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}
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//---------------------------------------------------------------------------
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void CheckClass::InitVar(struct VAR *varlist, const char varname[])
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{
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for (struct VAR *var = varlist; var; var = var->next)
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{
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if (strcmp(var->name, varname) == 0)
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{
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var->init = true;
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break;
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}
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}
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}
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//---------------------------------------------------------------------------
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void CheckClass::ClassChecking_VarList_Initialize(const Token *tok1, const Token *ftok, struct VAR *varlist, const char classname[], std::list<std::string> &callstack)
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{
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bool Assign = false;
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unsigned int indentlevel = 0;
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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(varlist, ftok->aaaa());
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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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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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InitVar(varlist, ftok->next()->aaaa());
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}
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// Before a new statement there is "[{};)=]" or "else"
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if (! Token::Match(ftok, "[{};)=]") && ftok->str() != "else")
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continue;
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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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for (struct VAR *var = varlist; var; var = var->next)
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var->init = true;
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break;
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}
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if (!Token::Match(ftok->next(), "%var%") && !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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ftok = ftok->tokAt(2);
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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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for (struct VAR *var = varlist; var; var = var->next)
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var->init = true;
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break;
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}
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// Calling member function?
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else if (Token::Match(ftok, "%var% ("))
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{
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// No recursive calls!
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if (std::find(callstack.begin(), callstack.end(), ftok->str()) == callstack.end())
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{
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callstack.push_back(ftok->str());
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int i = 0;
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const Token *ftok2 = Tokenizer::FindClassFunction(tok1, classname, ftok->aaaa(), i);
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ClassChecking_VarList_Initialize(tok1, ftok2, varlist, classname, callstack);
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}
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}
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// Assignment of member variable?
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else if (Token::Match(ftok, "%var% ="))
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{
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InitVar(varlist, ftok->aaaa());
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}
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// The functions 'clear' and 'Clear' are supposed to initialize variable.
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if (Token::Match(ftok, "%var% . clear|Clear ("))
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{
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InitVar(varlist, ftok->aaaa());
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}
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}
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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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const char pattern_class[] = "class %var% {";
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// Locate class
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const Token *tok1 = Token::findmatch(_tokenizer->tokens(), pattern_class);
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while (tok1)
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{
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const char *className[2];
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className[0] = tok1->strAt(1);
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className[1] = 0;
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const Token *classNameToken = tok1->tokAt(1);
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// TODO: handling of private constructors should be improved.
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bool hasPrivateConstructor = false;
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{
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int indentlevel = 0;
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bool isPrivate = true;
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for (const Token *tok = tok1; tok; tok = tok->next())
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{
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// Indentation
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if (tok->str() == "{")
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++indentlevel;
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else if (tok->str() == "}")
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{
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--indentlevel;
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if (indentlevel <= 0)
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break;
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}
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// Parse class contents (indentlevel == 1)..
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if (indentlevel == 1)
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{
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// What section are we in.. private/non-private
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if (tok->str() == "private:")
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isPrivate = true;
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else if (tok->str() == "protected:" || tok->str() == "public:")
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isPrivate = false;
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// Is there a private constructor?
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else if (isPrivate && Token::simpleMatch(tok, (classNameToken->str() + " (").c_str()))
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{
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hasPrivateConstructor = true;
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break;
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}
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}
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}
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}
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if (hasPrivateConstructor)
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{
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// TODO: Handle private constructors.
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// Right now to avoid false positives I just bail out
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tok1 = Token::findmatch(tok1->next(), pattern_class);
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continue;
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}
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// Are there a class constructor?
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std::string tempPattern = "%any% " + classNameToken->str() + " (";
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const Token *constructor_token = Token::findmatch(tok1, tempPattern.c_str());
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while (Token::Match(constructor_token, "~"))
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constructor_token = Token::findmatch(constructor_token->next(), tempPattern.c_str());
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// There are no constructor.
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if (! constructor_token)
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{
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// If "--style" has been given, give a warning
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if (ErrorLogger::noConstructor(_settings))
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{
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// If the class has member variables there should be an constructor
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struct VAR *varlist = ClassChecking_GetVarList(tok1);
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if (varlist)
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{
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_errorLogger->noConstructor(_tokenizer, tok1, classNameToken->str());
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}
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// Delete the varlist..
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while (varlist)
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{
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struct VAR *nextvar = varlist->next;
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delete varlist;
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varlist = nextvar;
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}
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}
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tok1 = Token::findmatch(tok1->next(), pattern_class);
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continue;
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}
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// Check that all member variables are initialized..
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struct VAR *varlist = ClassChecking_GetVarList(tok1);
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// Check constructors
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CheckConstructors(tok1, varlist, className[0]);
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// Check assignment operators
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CheckConstructors(tok1, varlist, "operator =");
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// Delete the varlist..
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while (varlist)
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{
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struct VAR *nextvar = varlist->next;
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delete varlist;
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varlist = nextvar;
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}
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tok1 = Token::findmatch(tok1->next(), pattern_class);
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}
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}
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void CheckClass::CheckConstructors(const Token *tok1, struct VAR *varlist, const char funcname[])
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{
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const char * const className = tok1->strAt(1);
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int indentlevel = 0;
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const Token *constructor_token = Tokenizer::FindClassFunction(tok1, className, funcname, indentlevel);
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std::list<std::string> callstack;
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ClassChecking_VarList_Initialize(tok1, constructor_token, varlist, className, callstack);
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while (constructor_token)
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{
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// Check if any variables are uninitialized
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for (struct VAR *var = varlist; var; var = var->next)
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{
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if (var->init)
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continue;
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// Is it a static member variable?
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std::ostringstream pattern;
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pattern << className << "::" << var->name << "=";
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if (Token::findmatch(_tokenizer->tokens(), pattern.str().c_str()))
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continue;
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// It's non-static and it's not initialized => error
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_errorLogger->uninitVar(_tokenizer, constructor_token, className, var->name);
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}
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for (struct VAR *var = varlist; var; var = var->next)
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var->init = false;
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constructor_token = Tokenizer::FindClassFunction(constructor_token->next(), className, funcname, indentlevel);
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callstack.clear();
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ClassChecking_VarList_Initialize(tok1, constructor_token, varlist, className, callstack);
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Unused private functions
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//---------------------------------------------------------------------------
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void CheckClass::privateFunctions()
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{
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// Locate some class
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for (const Token *tok1 = Token::findmatch(_tokenizer->tokens(), "class %var% {"); tok1; tok1 = Token::findmatch(tok1->next(), "class %var% {"))
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{
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const std::string &classname = tok1->next()->str();
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// The class implementation must be available..
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const std::string classconstructor(classname + " :: " + classname);
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if (tok1->fileIndex() > 0 && !Token::findmatch(_tokenizer->tokens(), classconstructor.c_str()))
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continue;
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// Get private functions..
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std::list<const Token *> FuncList;
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FuncList.clear();
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bool priv = false;
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unsigned int indent_level = 0;
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for (const Token *tok = tok1; tok; tok = tok->next())
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{
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if (Token::Match(tok, "friend %var%"))
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{
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// Todo: Handle friend classes
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FuncList.clear();
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break;
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}
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if (tok->str() == "{")
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++indent_level;
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else if (tok->str() == "}")
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{
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if (indent_level <= 1)
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break;
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--indent_level;
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}
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else if (tok->str() == "private:")
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priv = true;
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else if (tok->str() == "public:")
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priv = false;
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else if (tok->str() == "protected:")
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priv = false;
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else if (priv && indent_level == 1)
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{
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if (Token::Match(tok, "typedef %type% ("))
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tok = tok->tokAt(2);
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if (Token::Match(tok, "%var% (") &&
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!Token::Match(tok, classname.c_str()))
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{
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FuncList.push_back(tok);
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}
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}
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}
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// Check that all private functions are used..
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bool HasFuncImpl = false;
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bool inclass = false;
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indent_level = 0;
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const std::string pattern_function(classname + " ::");
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for (const Token *ftok = _tokenizer->tokens(); ftok; ftok = ftok->next())
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{
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if (ftok->str() == "{")
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++indent_level;
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else if (ftok->str() == "}")
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{
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if (indent_level > 0)
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--indent_level;
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if (indent_level == 0)
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inclass = false;
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}
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if (Token::Match(ftok, ("class " + classname + " :|{").c_str()))
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{
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indent_level = 0;
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inclass = true;
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}
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// Check member class functions to see what functions are used..
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if ((inclass && indent_level == 1 && Token::Match(ftok, ") const| {")) ||
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(Token::Match(ftok, (classname + " :: ~| %var% (").c_str())))
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{
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while (ftok && ftok->str() != ")")
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ftok = ftok->next();
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if (!ftok)
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break;
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if (Token::Match(ftok, ") : %var% ("))
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{
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while (!Token::Match(ftok->next(), "[{};]"))
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ftok = ftok->next();
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}
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if (!Token::Match(ftok, ") const| {"))
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continue;
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if (ftok->fileIndex() == 0)
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HasFuncImpl = true;
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// Parse function..
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int indentlevel2 = 0;
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for (const Token *tok2 = ftok; tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "{")
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++indentlevel2;
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else if (tok2->str() == "}")
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{
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--indentlevel2;
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if (indentlevel2 < 1)
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break;
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}
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else if (Token::Match(tok2, "%var% ("))
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{
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// Remove function from FuncList
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for (std::list<const Token *>::iterator it = FuncList.begin(); it != FuncList.end(); ++it)
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{
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if (tok2->str() == (*it)->str())
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{
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FuncList.remove(*it);
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break;
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}
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}
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}
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}
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}
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}
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while (HasFuncImpl && !FuncList.empty())
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{
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// Final check; check if the function pointer is used somewhere..
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const std::string _pattern("return|(|)|,|= " + FuncList.front()->str());
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if (!Token::findmatch(_tokenizer->tokens(), _pattern.c_str()))
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{
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_errorLogger->unusedPrivateFunction(_tokenizer, FuncList.front(), classname, FuncList.front()->str());
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}
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FuncList.pop_front();
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}
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}
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Check that memset is not used on classes
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//---------------------------------------------------------------------------
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void CheckClass::noMemset()
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{
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// Locate all 'memset' tokens..
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if (!Token::Match(tok, "memset|memcpy|memmove"))
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continue;
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// Todo: Handle memcpy and memmove
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const char *type = NULL;
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if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
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type = tok->strAt(8);
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else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
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type = tok->strAt(9);
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else if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
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type = tok->strAt(9);
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else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
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type = tok->strAt(10);
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else if (Token::Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
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type = tok->strAt(8);
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// No type defined => The tokens didn't match
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if (!(type && type[0]))
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continue;
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// Warn if type is a class..
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const std::string pattern1(std::string("class ") + type);
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if (Token::findmatch(_tokenizer->tokens(), pattern1.c_str()))
|
|
{
|
|
_errorLogger->memsetClass(_tokenizer, tok, tok->str());
|
|
continue;
|
|
}
|
|
|
|
// Warn if type is a struct that contains any std::*
|
|
const std::string pattern2(std::string("struct ") + type);
|
|
for (const Token *tstruct = Token::findmatch(_tokenizer->tokens(), pattern2.c_str()); tstruct; tstruct = tstruct->next())
|
|
{
|
|
if (tstruct->str() == "}")
|
|
break;
|
|
|
|
if (Token::Match(tstruct, "std :: %type% %var% ;"))
|
|
{
|
|
_errorLogger->memsetStruct(_tokenizer, tok, tok->str(), tstruct->strAt(2));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "void operator=("
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::operatorEq()
|
|
{
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), "void operator = (");
|
|
if (tok)
|
|
{
|
|
_errorLogger->operatorEq(_tokenizer, tok);
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// A destructor in a base class should be virtual
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::virtualDestructor()
|
|
{
|
|
const char pattern_classdecl[] = "class %var% : %var%";
|
|
|
|
const Token *derived = _tokenizer->tokens();
|
|
while ((derived = Token::findmatch(derived, pattern_classdecl)) != NULL)
|
|
{
|
|
// Check that the derived class has a non empty destructor..
|
|
{
|
|
std::ostringstream destructorPattern;
|
|
destructorPattern << "~ " << derived->strAt(1) << " ( ) {";
|
|
const Token *derived_destructor = Token::findmatch(_tokenizer->tokens(), destructorPattern.str().c_str());
|
|
|
|
// No destructor..
|
|
if (! derived_destructor)
|
|
{
|
|
derived = derived->next();
|
|
continue;
|
|
}
|
|
|
|
// Empty destructor..
|
|
if (Token::Match(derived_destructor, "~ %var% ( ) { }"))
|
|
{
|
|
derived = derived->next();
|
|
continue;
|
|
}
|
|
}
|
|
|
|
const Token *derivedClass = derived->tokAt(1);
|
|
|
|
// Iterate through each base class...
|
|
derived = derived->tokAt(3);
|
|
while (Token::Match(derived, "%var%"))
|
|
{
|
|
bool isPublic = Token::Match(derived, "public");
|
|
|
|
// What kind of inheritance is it.. public|protected|private
|
|
if (Token::Match(derived, "public|protected|private"))
|
|
derived = derived->next();
|
|
|
|
// Name of base class..
|
|
const char *baseName[2];
|
|
baseName[0] = derived->strAt(0);
|
|
baseName[1] = 0;
|
|
|
|
// Update derived so it's ready for the next loop.
|
|
derived = derived->next();
|
|
if (Token::Match(derived, ","))
|
|
derived = derived->next();
|
|
|
|
// If not public inheritance, skip checking of this base class..
|
|
if (! isPublic)
|
|
continue;
|
|
|
|
// Find the destructor declaration for the base class.
|
|
const Token *base = Token::findmatch(_tokenizer->tokens(), (std::string("%any% ~ ") + baseName[0] + " (").c_str());
|
|
while (Token::Match(base, "::"))
|
|
base = Token::findmatch(base->next(), (std::string("%any% ~ ") + baseName[0] + + " (").c_str());
|
|
|
|
while (Token::Match(base, "%var%") && !Token::Match(base, "virtual"))
|
|
base = base->previous();
|
|
|
|
// Check that there is a destructor..
|
|
if (! base)
|
|
{
|
|
// Is the class declaration available?
|
|
base = Token::findmatch(_tokenizer->tokens(), (std::string("class ") + baseName[0] + " :|{").c_str());
|
|
if (base)
|
|
{
|
|
_errorLogger->virtualDestructor(_tokenizer, base, baseName[0], derivedClass->str());
|
|
}
|
|
}
|
|
|
|
// There is a destructor. Check that it's virtual..
|
|
else if (base->str() != "virtual")
|
|
{
|
|
_errorLogger->virtualDestructor(_tokenizer, base, baseName[0], derivedClass->str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|