1571 lines
53 KiB
C++
1571 lines
53 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 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 <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::Var *CheckClass::getVarList(const Token *tok1, bool withClasses, bool isStruct)
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{
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// Get variable list..
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Var *varlist = NULL;
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unsigned int indentlevel = 0;
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bool priv = !isStruct;
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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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if (tok->str() == "__published:")
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{
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priv = false;
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for (; tok; tok = tok->next())
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{
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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 && Token::Match(tok->next(), "private:|protected:|public:"))
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break;
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}
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if (tok)
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continue;
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else
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break;
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}
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// "private:" "public:" "protected:" etc
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const bool b((*tok->strAt(0) != ':') && strchr(tok->strAt(0), ':') != 0);
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if (b)
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priv = bool(tok->str() == "private:");
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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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continue;
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// Variable declarations that start with "static" shall be ignored..
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if (next->str() == "static")
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continue;
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// Type definitions shall be ignored..
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if (next->str() == "typedef")
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continue;
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// Is it a variable declaration?
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if (Token::Match(next, "%type% %var% ;"))
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{
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if (withClasses)
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varname = next->strAt(1);
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else 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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// Array?
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else if (Token::Match(next, "%type% %var% [") && next->next()->str() != "operator")
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{
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if (Token::findmatch(_tokenizer->tokens(), ("class " + next->str()).c_str()))
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continue;
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varname = next->strAt(1);
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}
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// Pointer array?
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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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// std::string..
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else if (withClasses && Token::Match(next, "std :: string %var% ;"))
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{
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varname = next->strAt(3);
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}
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// Container..
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else if (withClasses && Token::Match(next, "std :: %type% <"))
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{
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while (next && next->str() != ">")
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next = next->next();
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if (Token::Match(next, "> %var% ;"))
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varname = next->strAt(1);
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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 && strcmp(varname, "operator"))
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{
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Var *var = new Var(varname, false, priv, 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(Var *varlist, const char varname[])
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{
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for (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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return;
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}
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}
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}
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//---------------------------------------------------------------------------
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void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *varlist, const char classname[], std::list<std::string> &callstack, bool isStruct)
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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->strAt(0));
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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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initVar(varlist, ftok->strAt(1));
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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 (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%") &&
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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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// Skip "classname :: "
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if (Token::Match(ftok, "%var% ::"))
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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 (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->strAt(0), i, isStruct);
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if (ftok2)
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{
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initializeVarList(tok1, ftok2, varlist, classname, callstack, isStruct);
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}
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else // there is a called member function, but it is not defined where we can find it, so we assume it initializes everything
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{
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// check if the function is part of this class..
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const Token *tok = Token::findmatch(_tokenizer->tokens(), (std::string("class ") + classname + " {").c_str());
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for (tok = tok ? tok->tokAt(3) : 0; tok; tok = tok->next())
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{
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if (tok->str() == "{")
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{
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tok = tok->link();
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if (!tok)
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break;
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}
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else if (tok->str() == "}")
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{
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break;
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}
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else if (tok->str() == ftok->str() || tok->str() == "friend")
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{
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tok = 0;
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break;
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}
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}
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// bail out..
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if (!tok)
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{
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for (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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// the function is external and it's neither friend nor inherited virtual function.
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// assume all variables that are passed to it are initialized..
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unsigned int indentlevel = 0;
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for (tok = ftok->tokAt(2); tok; tok = tok->next())
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{
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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 == 0)
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break;
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--indentlevel;
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}
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if (tok->isName())
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{
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initVar(varlist, tok->strAt(0));
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}
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}
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continue;
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}
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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->strAt(0));
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}
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// Assignment of array item of member variable?
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else if (Token::Match(ftok, "%var% [ %any% ] ="))
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{
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initVar(varlist, ftok->strAt(0));
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}
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// Assignment of array item of member variable?
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else if (Token::Match(ftok, "%var% [ %any% ] [ %any% ] ="))
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{
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initVar(varlist, ftok->strAt(0));
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}
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// Assignment of array item of member variable?
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else if (Token::Match(ftok, "* %var% ="))
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{
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initVar(varlist, ftok->strAt(1));
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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->strAt(0));
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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|struct %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;
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className = tok1->strAt(1);
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const Token *classNameToken = tok1->tokAt(1);
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bool isStruct = tok1->str() == "struct";
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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 = !isStruct;
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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 && !_settings->_showAll)
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{
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/** @todo Handle private constructors. Right now to avoid
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* false positives we 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 (constructor_token && constructor_token->str() == "~")
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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 (_settings->_checkCodingStyle)
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{
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// Get class variables...
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Var *varlist = getVarList(tok1, false, isStruct);
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// If there is a private variable, there should be a constructor..
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for (const Var *var = varlist; var; var = var->next)
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{
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if (var->priv)
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{
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noConstructorError(tok1, classNameToken->str(), isStruct);
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break;
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}
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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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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 constructors
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checkConstructors(tok1, className, hasPrivateConstructor, isStruct);
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// Check assignment operators
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checkConstructors(tok1, "operator =", hasPrivateConstructor, isStruct);
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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, const char funcname[], bool hasPrivateConstructor, bool isStruct)
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{
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const char * const className = tok1->strAt(1);
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// Check that all member variables are initialized..
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bool withClasses = bool(_settings->_showAll && std::string(funcname) == "operator =");
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Var *varlist = getVarList(tok1, withClasses, isStruct);
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int indentlevel = 0;
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const Token *constructor_token = Tokenizer::findClassFunction(tok1, className, funcname, indentlevel, isStruct);
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std::list<std::string> callstack;
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initializeVarList(tok1, constructor_token, varlist, className, callstack, isStruct);
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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 (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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if (Token::simpleMatch(constructor_token, "operator = (") ||
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Token::simpleMatch(constructor_token->tokAt(2), "operator = ("))
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{
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const Token *operStart = 0;
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if (Token::simpleMatch(constructor_token, "operator = ("))
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operStart = constructor_token->tokAt(2);
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else
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operStart = constructor_token->tokAt(4);
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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() == 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(constructor_token, className, var->name);
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}
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else
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uninitVarError(constructor_token, className, var->name, hasPrivateConstructor);
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}
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for (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, isStruct);
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callstack.clear();
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initializeVarList(tok1, constructor_token, varlist, className, callstack, isStruct);
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}
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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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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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|
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//---------------------------------------------------------------------------
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// ClassCheck: Unused private functions
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|
//---------------------------------------------------------------------------
|
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|
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void CheckClass::privateFunctions()
|
|
{
|
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// Locate some class
|
|
for (const Token *tok1 = Token::findmatch(_tokenizer->tokens(), "class|struct %var% {"); tok1; tok1 = Token::findmatch(tok1->next(), "class|struct %var% {"))
|
|
{
|
|
/** @todo check that the whole class implementation is seen */
|
|
// until the todo above is fixed we only check classes that are
|
|
// declared in the source file
|
|
if (tok1->fileIndex() != 0)
|
|
continue;
|
|
|
|
const std::string &classname = tok1->next()->str();
|
|
|
|
// Get private functions..
|
|
std::list<const Token *> FuncList;
|
|
FuncList.clear();
|
|
bool isStruct = tok1->str() == "struct";
|
|
bool priv = !isStruct;
|
|
unsigned int indent_level = 0;
|
|
for (const Token *tok = tok1; tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "friend %var%"))
|
|
{
|
|
/** @todo Handle friend classes */
|
|
FuncList.clear();
|
|
break;
|
|
}
|
|
|
|
if (tok->str() == "{")
|
|
++indent_level;
|
|
else if (tok->str() == "}")
|
|
{
|
|
if (indent_level <= 1)
|
|
break;
|
|
--indent_level;
|
|
}
|
|
|
|
else if (indent_level != 1)
|
|
continue;
|
|
else if (tok->str() == "private:")
|
|
priv = true;
|
|
else if (tok->str() == "public:")
|
|
priv = false;
|
|
else if (tok->str() == "protected:")
|
|
priv = false;
|
|
else if (priv)
|
|
{
|
|
if (Token::Match(tok, "typedef %type% ("))
|
|
tok = tok->tokAt(2)->link();
|
|
|
|
else if (Token::Match(tok, "[:,] %var% ("))
|
|
tok = tok->tokAt(2)->link();
|
|
|
|
else if (Token::Match(tok, "%var% (") &&
|
|
!Token::simpleMatch(tok->next()->link(), ") (") &&
|
|
!Token::Match(tok, classname.c_str()))
|
|
{
|
|
FuncList.push_back(tok);
|
|
}
|
|
}
|
|
|
|
/** @todo embedded class have access to private functions */
|
|
if (tok->str() == "class")
|
|
{
|
|
FuncList.clear();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Check that all private functions are used..
|
|
bool HasFuncImpl = false;
|
|
bool inclass = false;
|
|
indent_level = 0;
|
|
for (const Token *ftok = _tokenizer->tokens(); ftok; ftok = ftok->next())
|
|
{
|
|
if (ftok->str() == "{")
|
|
++indent_level;
|
|
else if (ftok->str() == "}")
|
|
{
|
|
if (indent_level > 0)
|
|
--indent_level;
|
|
if (indent_level == 0)
|
|
inclass = false;
|
|
}
|
|
|
|
if (Token::Match(ftok, ("class " + classname + " :|{").c_str()))
|
|
{
|
|
indent_level = 0;
|
|
inclass = true;
|
|
}
|
|
|
|
// Check member class functions to see what functions are used..
|
|
if ((inclass && indent_level == 1 && Token::Match(ftok, ") const| {")) ||
|
|
(Token::Match(ftok, (classname + " :: ~| %var% (").c_str())))
|
|
{
|
|
while (ftok && ftok->str() != ")")
|
|
ftok = ftok->next();
|
|
if (!ftok)
|
|
break;
|
|
if (Token::Match(ftok, ") : %var% ("))
|
|
{
|
|
while (!Token::Match(ftok->next(), "[{};]"))
|
|
ftok = ftok->next();
|
|
}
|
|
if (!Token::Match(ftok, ") const| {"))
|
|
continue;
|
|
|
|
if (ftok->fileIndex() == 0)
|
|
HasFuncImpl = true;
|
|
|
|
// Parse function..
|
|
int indentlevel2 = 0;
|
|
for (const Token *tok2 = ftok; tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "{")
|
|
++indentlevel2;
|
|
else if (tok2->str() == "}")
|
|
{
|
|
--indentlevel2;
|
|
if (indentlevel2 < 1)
|
|
break;
|
|
}
|
|
else if (Token::Match(tok2, "%var% ("))
|
|
{
|
|
// Remove function from FuncList
|
|
std::list<const Token *>::iterator it = FuncList.begin();
|
|
while (it != FuncList.end())
|
|
{
|
|
if (tok2->str() == (*it)->str())
|
|
FuncList.erase(it++);
|
|
else
|
|
it++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
while (HasFuncImpl && !FuncList.empty())
|
|
{
|
|
// Final check; check if the function pointer is used somewhere..
|
|
const std::string _pattern("return|(|)|,|= " + FuncList.front()->str());
|
|
if (!Token::findmatch(_tokenizer->tokens(), _pattern.c_str()))
|
|
{
|
|
unusedPrivateFunctionError(FuncList.front(), classname, FuncList.front()->str());
|
|
}
|
|
FuncList.pop_front();
|
|
}
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: Check that memset is not used on classes
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::noMemset()
|
|
{
|
|
// Locate all 'memset' tokens..
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (!Token::Match(tok, "memset|memcpy|memmove"))
|
|
continue;
|
|
|
|
const char *type = NULL;
|
|
if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( %type% ) )"))
|
|
type = tok->strAt(8);
|
|
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( %type% ) )"))
|
|
type = tok->strAt(9);
|
|
else if (Token::Match(tok, "memset ( %var% , %num% , sizeof ( struct %type% ) )"))
|
|
type = tok->strAt(9);
|
|
else if (Token::Match(tok, "memset ( & %var% , %num% , sizeof ( struct %type% ) )"))
|
|
type = tok->strAt(10);
|
|
else if (Token::Match(tok, "%type% ( %var% , %var% , sizeof ( %type% ) )"))
|
|
type = tok->strAt(8);
|
|
|
|
// No type defined => The tokens didn't match
|
|
if (!(type && type[0]))
|
|
continue;
|
|
|
|
// Warn if type is a class..
|
|
const std::string pattern1(std::string("class ") + type);
|
|
if (Token::findmatch(_tokenizer->tokens(), pattern1.c_str()))
|
|
{
|
|
memsetClassError(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% ;"))
|
|
{
|
|
memsetStructError(tok, tok->str(), tstruct->strAt(2));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "void operator=("
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::operatorEq()
|
|
{
|
|
const Token *tok2 = _tokenizer->tokens();
|
|
const Token *tok;
|
|
|
|
while ((tok = Token::findmatch(tok2, "void operator = (")))
|
|
{
|
|
const Token *tok1 = tok;
|
|
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
|
|
{
|
|
if (tok1->str() == "public:")
|
|
{
|
|
operatorEqReturnError(tok);
|
|
break;
|
|
}
|
|
if (tok1->str() == "private:" || tok1->str() == "protected:")
|
|
break;
|
|
tok1 = tok1->previous();
|
|
}
|
|
|
|
if (tok1 && Token::Match(tok1, "struct %var%"))
|
|
operatorEqReturnError(tok);
|
|
|
|
tok2 = tok->next();
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "C& operator=(const C&) { ... return *this; }"
|
|
// operator= should return a reference to *this
|
|
//---------------------------------------------------------------------------
|
|
|
|
// match two lists of tokens
|
|
static bool nameMatch(const Token * tok1, const Token * tok2, int length)
|
|
{
|
|
for (int i = 0; i < length; i++)
|
|
{
|
|
if (tok1->tokAt(i) == 0 || tok2->tokAt(i) == 0)
|
|
return false;
|
|
|
|
if (tok1->tokAt(i)->str() != tok2->tokAt(i)->str())
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// create a class name from a list of tokens
|
|
static void nameStr(const Token * name, int length, std::string & str)
|
|
{
|
|
for (int i = 0; i < length; i++)
|
|
{
|
|
if (i != 0)
|
|
str += " ";
|
|
|
|
str += name->tokAt(i)->str();
|
|
}
|
|
}
|
|
|
|
void CheckClass::operatorEqRetRefThis()
|
|
{
|
|
const Token *tok2 = _tokenizer->tokens();
|
|
const Token *tok;
|
|
|
|
while ((tok = Token::findmatch(tok2, "operator = (")))
|
|
{
|
|
const Token *tok1 = tok;
|
|
|
|
if (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
|
|
{
|
|
// make sure this is an assignment operator
|
|
int nameLength = 1;
|
|
|
|
tok1 = tok1->tokAt(-2);
|
|
|
|
// check backwards for proper function signature
|
|
while (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
|
|
{
|
|
tok1 = tok1->tokAt(-2);
|
|
nameLength += 2;
|
|
}
|
|
|
|
const Token *name = tok1;
|
|
std::string nameString;
|
|
|
|
nameStr(name, nameLength, nameString);
|
|
|
|
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
|
|
{
|
|
// check class name
|
|
if (tok1->tokAt(-(1 + nameLength)) && nameMatch(name, tok1->tokAt(-(1 + nameLength)), nameLength))
|
|
{
|
|
// may take overloaded argument types so no need to check them
|
|
tok1 = tok->tokAt(2)->link();
|
|
|
|
if (tok1 && tok1->next() && tok1->next()->str() == "{")
|
|
{
|
|
const Token *last = tok1->next()->link()->tokAt(-2);
|
|
for (tok1 = tok1->tokAt(2); tok1 != last; tok1 = tok1->next())
|
|
{
|
|
// check for return of reference to this
|
|
if (tok1->str() == "return")
|
|
{
|
|
if (!(Token::Match(tok1->tokAt(1), "* this ;") ||
|
|
Token::Match(tok1->tokAt(1), "operator = (")))
|
|
operatorEqRetRefThisError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// make sure this is an assignment operator
|
|
tok1 = tok;
|
|
|
|
// check backwards for proper function signature
|
|
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
|
|
{
|
|
const Token *name = 0;
|
|
bool isPublic = false;
|
|
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
|
|
{
|
|
if (!isPublic)
|
|
{
|
|
if (tok1->str() == "public:")
|
|
isPublic = true;
|
|
}
|
|
tok1 = tok1->previous();
|
|
}
|
|
|
|
if (tok1 && Token::Match(tok1, "struct %var%"))
|
|
{
|
|
isPublic = true;
|
|
name = tok1->tokAt(1);
|
|
}
|
|
else if (tok1 && Token::Match(tok1, "class %var%"))
|
|
{
|
|
name = tok1->tokAt(1);
|
|
}
|
|
|
|
if (tok->tokAt(-2) && tok->tokAt(-2)->str() == name->str())
|
|
{
|
|
// may take overloaded argument types so no need to check them
|
|
tok1 = tok->tokAt(2)->link();
|
|
|
|
if (tok1 && tok1->next() && tok1->next()->str() == "{")
|
|
{
|
|
const Token *last = tok1->next()->link()->tokAt(-2);
|
|
for (tok1 = tok1->tokAt(2); tok1 != last; tok1 = tok1->next())
|
|
{
|
|
// check for return of reference to this
|
|
if (tok1->str() == "return")
|
|
{
|
|
if (!(Token::Match(tok1->tokAt(1), "* this ;") ||
|
|
Token::Match(tok1->tokAt(1), "operator = (")))
|
|
operatorEqRetRefThisError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tok2 = tok->next();
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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.
|
|
//---------------------------------------------------------------------------
|
|
|
|
static bool 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 ( %type%"))
|
|
{
|
|
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, "%type% ="))
|
|
{
|
|
if (tok1->str() == var->str())
|
|
return true;
|
|
}
|
|
|
|
tok1 = tok1->next();
|
|
}
|
|
}
|
|
else if (Token::Match(tok, "{|;|, delete [ ] %type%"))
|
|
{
|
|
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, "%type% = new ["))
|
|
{
|
|
if (tok1->str() == var->str())
|
|
return true;
|
|
}
|
|
|
|
tok1 = tok1->next();
|
|
}
|
|
}
|
|
else if (Token::Match(tok, "{|;|, delete %type%"))
|
|
{
|
|
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, "%type% = new"))
|
|
{
|
|
if (tok1->str() == var->str())
|
|
return true;
|
|
}
|
|
|
|
tok1 = tok1->next();
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool hasAssignSelf(const Token * first, const Token * last, const Token * rhs)
|
|
{
|
|
for (const Token * tok = first; tok && tok != last; tok = tok->next())
|
|
{
|
|
if (Token::Match(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;
|
|
}
|
|
|
|
static bool hasMultipleInheritanceInline(const Token * tok)
|
|
{
|
|
while (tok && tok->str() != "{")
|
|
{
|
|
if (tok->str() == ",")
|
|
return true;
|
|
|
|
tok = tok->next();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool hasMultipleInheritanceGlobal(const Token * start, const std::string & name)
|
|
{
|
|
const Token *tok = start;
|
|
std::string pattern;
|
|
std::string className = name;
|
|
|
|
// check for nested classes
|
|
while (className.find("::") != std::string::npos)
|
|
{
|
|
std::string tempName;
|
|
|
|
// there is probably a better way to do this
|
|
while (className[0] != ' ')
|
|
{
|
|
tempName += className[0];
|
|
className.erase(0, 1);
|
|
}
|
|
|
|
className.erase(0, 4);
|
|
|
|
pattern = "class|struct " + tempName;
|
|
|
|
tok = Token::findmatch(tok, pattern.c_str());
|
|
}
|
|
|
|
pattern = "class|struct " + className;
|
|
|
|
tok = Token::findmatch(tok, pattern.c_str());
|
|
|
|
return hasMultipleInheritanceInline(tok);
|
|
}
|
|
|
|
void CheckClass::operatorEqToSelf()
|
|
{
|
|
const Token *tok2 = _tokenizer->tokens();
|
|
const Token *tok;
|
|
|
|
while ((tok = Token::findmatch(tok2, "operator = (")))
|
|
{
|
|
const Token *tok1 = tok;
|
|
|
|
// make sure this is an assignment operator
|
|
if (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
|
|
{
|
|
int nameLength = 1;
|
|
|
|
tok1 = tok1->tokAt(-2);
|
|
|
|
// check backwards for proper function signature
|
|
while (tok1->tokAt(-2) && Token::Match(tok1->tokAt(-2), " %type% ::"))
|
|
{
|
|
tok1 = tok1->tokAt(-2);
|
|
nameLength += 2;
|
|
}
|
|
|
|
const Token *name = tok1;
|
|
std::string nameString;
|
|
|
|
nameStr(name, nameLength, nameString);
|
|
|
|
if (!hasMultipleInheritanceGlobal(_tokenizer->tokens(), nameString))
|
|
{
|
|
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
|
|
{
|
|
// check returned class name
|
|
if (tok1->tokAt(-(1 + nameLength)) && nameMatch(name, tok1->tokAt(-(1 + nameLength)), nameLength))
|
|
{
|
|
// check forward for proper function signature
|
|
std::string pattern = "const " + nameString + " & %type% )";
|
|
if (Token::Match(tok->tokAt(3), pattern.c_str()))
|
|
{
|
|
const Token * rhs = tok->tokAt(5 + nameLength);
|
|
|
|
if (nameMatch(name, tok->tokAt(4), nameLength))
|
|
{
|
|
tok1 = tok->tokAt(2)->link();
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tok1 = tok;
|
|
|
|
// check backwards for proper function signature
|
|
if (tok1->tokAt(-1) && tok1->tokAt(-1)->str() == "&")
|
|
{
|
|
const Token *name = 0;
|
|
while (tok1 && !Token::Match(tok1, "class|struct %var%"))
|
|
tok1 = tok1->previous();
|
|
|
|
if (tok1 && Token::Match(tok1, "struct %var%"))
|
|
name = tok1->tokAt(1);
|
|
else if (tok1 && Token::Match(tok1, "class %var%"))
|
|
name = tok1->tokAt(1);
|
|
|
|
if (!hasMultipleInheritanceInline(tok1))
|
|
{
|
|
if (tok->tokAt(-2) && tok->tokAt(-2)->str() == name->str())
|
|
{
|
|
// check forward for proper function signature
|
|
if (Token::Match(tok->tokAt(3), "const %type% & %type% )"))
|
|
{
|
|
const Token * rhs = tok->tokAt(6);
|
|
|
|
if (tok->tokAt(4)->str() == name->str())
|
|
{
|
|
tok1 = tok->tokAt(2)->link();
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
tok2 = tok->next();
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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(derived->str() == "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.
|
|
do
|
|
{
|
|
if (derived->str() == "{")
|
|
break;
|
|
|
|
if (derived->str() == ",")
|
|
{
|
|
derived = derived->next();
|
|
break;
|
|
}
|
|
|
|
derived = derived->next();
|
|
}
|
|
while (derived);
|
|
|
|
// 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 (base && base->str() == "::")
|
|
base = Token::findmatch(base->next(), (std::string("%any% ~ ") + baseName[0] + " (").c_str());
|
|
|
|
const Token *reverseTok = base;
|
|
while (Token::Match(base, "%var%") && base->str() != "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)
|
|
{
|
|
virtualDestructorError(base, baseName[0], derivedClass->str());
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
// There is a destructor. Check that it's virtual..
|
|
else if (base->str() == "virtual")
|
|
continue;
|
|
|
|
// 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 (!Token::findmatch(_tokenizer->tokens(), (std::string("class ") + baseName[0] + " {").c_str()))
|
|
continue;
|
|
|
|
// 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.)
|
|
int indent = 0;
|
|
while (reverseTok)
|
|
{
|
|
if (reverseTok->str() == "public:")
|
|
{
|
|
virtualDestructorError(base, baseName[0], derivedClass->str());
|
|
break;
|
|
}
|
|
else if (reverseTok->str() == "protected:" ||
|
|
reverseTok->str() == "private:")
|
|
{
|
|
// No bug, protected/private destructor is allowed
|
|
break;
|
|
}
|
|
else if (reverseTok->str() == "{")
|
|
{
|
|
indent++;
|
|
if (indent >= 1)
|
|
{
|
|
// We have found the start of the class without any sign
|
|
// of "public :" so we can assume that the destructor is not
|
|
// public and there is no bug in the code we are checking.
|
|
break;
|
|
}
|
|
}
|
|
else if (reverseTok->str() == "}")
|
|
indent--;
|
|
|
|
reverseTok = reverseTok->previous();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::thisSubtractionError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::possibleStyle, "thisSubtraction", "Suspicious pointer subtraction");
|
|
}
|
|
|
|
void CheckClass::thisSubtraction()
|
|
{
|
|
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::checkConst()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "class|struct %var% {"))
|
|
{
|
|
// get class name..
|
|
const std::string classname(tok->strAt(1));
|
|
|
|
// goto initial {'
|
|
while (tok && tok->str() != "{")
|
|
tok = tok->next();
|
|
if (!tok)
|
|
break;
|
|
|
|
// parse in this class definition to see if there are any simple getter functions
|
|
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "{")
|
|
tok2 = tok2->link();
|
|
else if (tok2->str() == "}")
|
|
break;
|
|
|
|
// start of statement?
|
|
if (!Token::Match(tok2->previous(), "[;{}]"))
|
|
continue;
|
|
|
|
// skip private: public: etc
|
|
if (tok2->isName() && tok2->str().find(":") != std::string::npos)
|
|
tok2 = tok2->next();
|
|
|
|
// static functions can't be const
|
|
// virtual functions may be non-const for a reason
|
|
if (Token::Match(tok2, "static|virtual"))
|
|
continue;
|
|
|
|
// member function?
|
|
if (Token::Match(tok2, "%type% %var% (") ||
|
|
Token::Match(tok2, "%type% %type% %var% (") ||
|
|
Token::Match(tok2, "%type% operator %any% ("))
|
|
{
|
|
// goto function name..
|
|
while (tok2->next()->str() != "(")
|
|
tok2 = tok2->next();
|
|
|
|
// get function name
|
|
const std::string functionName((tok2->isName() ? "" : "operator") + tok2->str());
|
|
if (functionName == classname)
|
|
continue;
|
|
|
|
// goto the ')'
|
|
tok2 = tok2->next()->link();
|
|
if (!tok2)
|
|
break;
|
|
|
|
// is this a non-const function that is implemented inline?
|
|
if (Token::simpleMatch(tok2, ") {"))
|
|
{
|
|
// 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 *tok3 = tok2; tok3; tok3 = tok3->next())
|
|
{
|
|
if (tok3->str() == "{")
|
|
++indentlevel;
|
|
else if (tok3->str() == "}")
|
|
{
|
|
if (indentlevel <= 1)
|
|
break;
|
|
--indentlevel;
|
|
}
|
|
|
|
// assignment.. = += |= ..
|
|
else if (tok3->str() == "=" ||
|
|
(tok3->str().find("=") == 1 &&
|
|
tok3->str().find_first_of("<>") == std::string::npos))
|
|
{
|
|
isconst = false;
|
|
break;
|
|
}
|
|
|
|
// increment/decrement (member variable?)..
|
|
else if (Token::Match(tok3, "++|--"))
|
|
{
|
|
isconst = false;
|
|
break;
|
|
}
|
|
|
|
// function call..
|
|
else if (tok3->str() != "return" && Token::Match(tok3, "%var% ("))
|
|
{
|
|
isconst = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// nothing non-const was found. write error..
|
|
if (isconst)
|
|
checkConstError(tok2, classname, functionName);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void CheckClass::checkConstError(const Token *tok, const std::string &classname, const std::string &funcname)
|
|
{
|
|
reportError(tok, Severity::style, "functionConst", "The function '" + classname + "::" + funcname + "' can be const");
|
|
}
|
|
|
|
|
|
|
|
void CheckClass::noConstructorError(const Token *tok, const std::string &classname, bool isStruct)
|
|
{
|
|
reportError(tok, Severity::style, "noConstructor", "The " + std::string(isStruct ? "struct" : "class") + " '" + classname + "' has no constructor. Member variables not initialized.");
|
|
}
|
|
|
|
void CheckClass::uninitVarError(const Token *tok, const std::string &classname, const std::string &varname, bool hasPrivateConstructor)
|
|
{
|
|
reportError(tok, hasPrivateConstructor ? Severity::possibleStyle : Severity::style, "uninitVar", "Member variable not initialized in the constructor '" + classname + "::" + varname + "'");
|
|
}
|
|
|
|
void CheckClass::operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::possibleStyle, "operatorEqVarError", "Member variable '" + classname + "::" + varname + "' is not assigned a value in '" + classname + "::operator=" + "'");
|
|
}
|
|
|
|
void CheckClass::unusedPrivateFunctionError(const Token *tok, const std::string &classname, const std::string &funcname)
|
|
{
|
|
reportError(tok, Severity::style, "unusedPrivateFunction", "Unused private function '" + classname + "::" + funcname + "'");
|
|
}
|
|
|
|
void CheckClass::memsetClassError(const Token *tok, const std::string &memfunc)
|
|
{
|
|
reportError(tok, Severity::error, "memsetClass", "Using '" + memfunc + "' on class");
|
|
}
|
|
|
|
void CheckClass::memsetStructError(const Token *tok, const std::string &memfunc, const std::string &classname)
|
|
{
|
|
reportError(tok, Severity::error, "memsetStruct", "Using '" + memfunc + "' on struct that contains a 'std::" + classname + "'");
|
|
}
|
|
|
|
void CheckClass::operatorEqReturnError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "operatorEq", "'operator=' should return something");
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
void CheckClass::operatorEqRetRefThisError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "operatorEqRetRefThis", "'operator=' should return reference to self");
|
|
}
|
|
|
|
void CheckClass::operatorEqToSelfError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::possibleStyle, "operatorEqToSelf", "'operator=' should check for assignment to self");
|
|
}
|
|
|