cppcheck/src/checkstl.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* 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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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/
*/
#include "checkstl.h"
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#include "errorlogger.h"
#include "token.h"
#include "tokenize.h"
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CheckStl::CheckStl(const Tokenizer *tokenizer, ErrorLogger *errorLogger)
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: _tokenizer(tokenizer), _errorLogger(errorLogger)
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{
}
CheckStl::~CheckStl()
{
}
void CheckStl::iterators()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
// it = foo.begin(); it != bar.end()
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if (Token::Match(tok, "%var% = %var% . begin ( ) ; %var% != %var% . end ( ) ;"))
{
// Different iterators..
if (tok->str() != tok->tokAt(8)->str())
continue;
// Same container..
if (tok->tokAt(2)->str() == tok->tokAt(10)->str())
continue;
_errorLogger->iteratorUsage(_tokenizer, tok, tok->tokAt(2)->str(), tok->tokAt(10)->str());
}
// it = foo.begin();
// while (it != bar.end())
if (Token::Match(tok, "%var% = %var% . begin ( ) ; while ( %var% != %var% . end ( )"))
{
// Different iterators..
if (tok->str() != tok->tokAt(10)->str())
continue;
// Same container..
if (tok->tokAt(2)->str() == tok->tokAt(12)->str())
continue;
_errorLogger->iteratorUsage(_tokenizer, tok, tok->tokAt(2)->str(), tok->tokAt(12)->str());
}
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}
}
void CheckStl::stlOutOfBounds()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (!Token::simpleMatch(tok, "for ("))
continue;
int indent = 1;
tok = tok->tokAt(2);
const Token *num = 0;
const Token *var = 0;
while (tok)
{
if (tok->str() == "(")
++indent;
if (tok->str() == ")")
{
--indent;
if (indent == 0)
break;
}
if (Token::Match(tok, "; %var% <= %var% . size ( ) ;"))
{
num = tok->tokAt(1);
var = tok->tokAt(3);
}
tok = tok->next();
}
tok = tok->next();
if (!num || tok->str() != "{")
continue;
std::string pattern = var->str() + " [ " + num->str() + " ]";
while (tok)
{
if (tok->str() == "{")
++indent;
if (tok->str() == "}")
{
--indent;
if (indent == 0)
break;
}
if (Token::Match(tok, pattern.c_str()))
{
_errorLogger->stlOutOfBounds(_tokenizer, tok, "When " + num->str() + " == size(), " + pattern);
}
tok = tok->next();
}
}
}
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void CheckStl::erase()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (Token::Match(tok, "for ("))
{
for (const Token *tok2 = tok->tokAt(2); tok2 && tok2->str() != ";"; tok2 = tok2->next())
{
if (Token::Match(tok2, "%var% = %var% . begin ( ) ; %var% != %var% . end ( ) ") &&
tok2->str() == tok2->tokAt(8)->str() &&
tok2->tokAt(2)->str() == tok2->tokAt(10)->str())
{
eraseCheckLoop(tok2);
break;
}
}
}
if (Token::Match(tok, "while ( %var% != %var% . end ( )"))
{
eraseCheckLoop(tok->tokAt(2));
}
}
}
void CheckStl::eraseCheckLoop(const Token *it)
{
const Token *tok = it;
// Search for the start of the loop body..
int indentlevel = 1;
while (indentlevel > 0 && 0 != (tok = tok->next()))
{
if (tok->str() == "(")
++indentlevel;
else if (tok->str() == ")")
--indentlevel;
}
if (! Token::simpleMatch(tok, ") {"))
return;
// Parse loop..
// Error if it contains "erase(it)" but neither "break;" nor "it="
indentlevel = 0;
const Token *tok2 = 0;
while (0 != (tok = tok->next()))
{
if (tok->str() == "{")
++indentlevel;
else if (tok->str() == "}")
{
--indentlevel;
if (indentlevel < 0)
break;
}
else if (Token::Match(tok, "break|return|goto") || Token::simpleMatch(tok, (it->str() + " =").c_str()))
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{
tok2 = 0;
break;
}
else if (Token::simpleMatch(tok, ("erase ( " + it->str() + " )").c_str()))
tok2 = tok;
}
// Write error message..
if (tok2)
_errorLogger->erase(_tokenizer, tok2);
}
void CheckStl::pushback()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (Token::Match(tok, "vector <"))
{
while (tok && tok->str() != ">")
tok = tok->next();
if (!tok)
break;
if (Token::Match(tok, "> :: iterator|const_iterator %var% =|;"))
{
const std::string iteratorname(tok->strAt(3));
std::string vectorname;
int indent = 0;
bool invalidIterator = false;
for (const Token *tok2 = tok;indent >= 0 && tok2; tok2 = tok2->next())
{
if (tok2->str() == "{" || tok2->str() == "(")
++indent;
else if (tok2->str() == "}" || tok2->str() == ")")
{
if (indent == 0 && Token::simpleMatch(tok2, ") {"))
tok2 = tok2->next();
else
--indent;
}
// Assigning iterator..
if (Token::Match(tok2, (iteratorname + " = %var% . begin ( )").c_str()))
{
vectorname = tok2->strAt(2);
invalidIterator = false;
}
// push_back on vector..
if (vectorname.size() && Token::Match(tok2, (vectorname + " . push_front|push_back").c_str()))
invalidIterator = true;
// Using invalid iterator..
if (invalidIterator)
{
if (Token::Match(tok2, ("++|--|*|+|-|(|, " + iteratorname).c_str()))
_errorLogger->pushback(_tokenizer, tok2, iteratorname);
if (Token::Match(tok2, (iteratorname + " ++|--|+|-").c_str()))
_errorLogger->pushback(_tokenizer, tok2, iteratorname);
}
}
}
}
}
}