379 lines
12 KiB
C++
379 lines
12 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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#include "checkstl.h"
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#include "tokenize.h"
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#include "token.h"
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// Register this check class (by creating a static instance of it)
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namespace
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{
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CheckStl instance;
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}
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// Error message for bad iterator usage..
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void CheckStl::iteratorsError(const Token *tok, const std::string &container1, const std::string &container2)
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{
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reportError(tok, "error", "iterators", "Same iterator is used with both " + container1 + " and " + container2);
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}
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// Error message used when dereferencing an iterator that has been erased..
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void CheckStl::dereferenceErasedError(const Token *tok, const std::string &itername)
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{
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reportError(tok, "error", "eraseDereference", "Dereferenced iterator '" + itername + "' has been erased");
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}
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void CheckStl::iterators()
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{
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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, "%var% = %var% . begin ( ) ;|+"))
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{
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const unsigned int iteratorId(tok->varId());
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const unsigned int containerId(tok->tokAt(2)->varId());
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if (iteratorId == 0 || containerId == 0)
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continue;
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bool validIterator = true;
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for (const Token *tok2 = tok->tokAt(6); tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "}")
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break;
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if (tok2->varId() == iteratorId)
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{
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if (Token::Match(tok2->next(), "!= %var% . end ( )") && tok2->tokAt(2)->varId() != containerId)
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iteratorsError(tok2, tok->strAt(2), tok2->strAt(2));
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}
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else if (Token::Match(tok2, "%var% . insert|erase ( %varid%", iteratorId))
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{
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if (tok2->varId() != containerId)
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iteratorsError(tok2, tok->strAt(2), tok2->str());
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else if (tok2->strAt(2) == std::string("erase"))
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validIterator = false;
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}
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else if (!validIterator && tok2->Match(tok2, "* %varid%", iteratorId))
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{
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dereferenceErasedError(tok2, tok2->strAt(1));
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}
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}
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}
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}
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}
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void CheckStl::stlOutOfBounds()
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{
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if (!Token::simpleMatch(tok, "for ("))
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continue;
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unsigned int indent = 0;
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for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "(")
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++indent;
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else if (tok2->str() == ")")
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{
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if (indent == 0)
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break;
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--indent;
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}
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if (Token::Match(tok2, "; %var% <= %var% . size ( ) ;"))
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{
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indent = 0;
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const std::string num(tok2->strAt(1));
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const std::string varname(tok2->strAt(3));
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for (const Token *tok3 = tok2->tokAt(8); tok3; tok3 = tok3->next())
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{
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if (tok3->str() == "{")
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++indent;
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else if (tok3->str() == "}")
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{
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if (indent == 0)
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break;
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--indent;
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}
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else if (tok3->str() == varname)
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{
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if (Token::simpleMatch(tok3->next(), ". size ( )"))
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break;
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else if (Token::simpleMatch(tok3->next(), ("[ " + num + " ]").c_str()))
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stlOutOfBoundsError(tok3, num, varname);
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}
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}
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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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// Error message for bad iterator usage..
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void CheckStl::stlOutOfBoundsError(const Token *tok, const std::string &num, const std::string &var)
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{
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reportError(tok, "error", "stlOutOfBounds", "When " + num + "==" + var + ".size(), " + var + "[" + num + "] is out of bounds");
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}
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void CheckStl::erase()
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{
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if (Token::simpleMatch(tok, "for ("))
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{
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for (const Token *tok2 = tok->tokAt(2); tok2 && tok2->str() != ";"; tok2 = tok2->next())
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{
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if (Token::Match(tok2, "%var% = %var% . begin ( ) ; %var% != %var% . end ( ) ") &&
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tok2->str() == tok2->tokAt(8)->str() &&
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tok2->tokAt(2)->str() == tok2->tokAt(10)->str())
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{
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eraseCheckLoop(tok2);
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break;
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}
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}
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}
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if (Token::Match(tok, "while ( %var% != %var% . end ( )"))
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{
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eraseCheckLoop(tok->tokAt(2));
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}
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}
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}
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void CheckStl::eraseCheckLoop(const Token *it)
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{
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const Token *tok = it;
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// Search for the start of the loop body..
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int indentlevel = 1;
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while (indentlevel > 0 && 0 != (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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--indentlevel;
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}
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if (! Token::simpleMatch(tok, ") {"))
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return;
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// Parse loop..
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// Error if it contains "erase(it)" but neither "break;" nor "it="
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indentlevel = 0;
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const Token *tok2 = 0;
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while (0 != (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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--indentlevel;
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if (indentlevel <= 0)
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break;
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}
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else if (Token::Match(tok, "break|return|goto") || Token::simpleMatch(tok, (it->str() + " =").c_str()))
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{
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tok2 = 0;
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break;
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}
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else if (Token::simpleMatch(tok, ("erase ( " + it->str() + " )").c_str()))
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tok2 = tok;
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}
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// Write error message..
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if (tok2)
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eraseError(tok2);
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}
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// Error message for bad iterator usage..
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void CheckStl::eraseError(const Token *tok)
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{
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reportError(tok, "error", "erase", "Dangerous usage of erase");
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}
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void CheckStl::pushback()
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{
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// Pointer can become invalid after push_back or push_front..
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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, "%var% = & %var% ["))
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{
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const unsigned int pointerId(tok->varId());
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const unsigned int containerId(tok->tokAt(3)->varId());
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if (pointerId == 0 || containerId == 0)
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continue;
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int indent = 0;
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bool invalidPointer = false;
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for (const Token *tok2 = tok; indent >= 0 && tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "{" || tok2->str() == "(")
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++indent;
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else if (tok2->str() == "}" || tok2->str() == ")")
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{
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if (indent == 0 && Token::simpleMatch(tok2, ") {"))
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tok2 = tok2->next();
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else
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--indent;
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}
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// push_back on vector..
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if (Token::Match(tok2, "%varid% . push_front|push_back", containerId))
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invalidPointer = true;
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// Using invalid pointer..
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if (invalidPointer && tok2->varId() == pointerId)
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{
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if (Token::simpleMatch(tok2->previous(), "*"))
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invalidPointerError(tok2, tok2->str());
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else if (Token::simpleMatch(tok2->next(), "."))
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invalidPointerError(tok2, tok2->str());
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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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// Iterator becomes invalid after push_back or push_front..
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if (Token::simpleMatch(tok, "vector <"))
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{
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while (tok && tok->str() != ">")
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tok = tok->next();
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if (!tok)
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break;
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if (Token::Match(tok, "> :: iterator|const_iterator %var% =|;"))
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{
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const unsigned int iteratorid(tok->tokAt(3)->varId());
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if (iteratorid == 0)
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continue;
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std::string vectorname;
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int indent = 0;
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bool invalidIterator = false;
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for (const Token *tok2 = tok;indent >= 0 && tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "{" || tok2->str() == "(")
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++indent;
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else if (tok2->str() == "}" || tok2->str() == ")")
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{
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if (indent == 0 && Token::simpleMatch(tok2, ") {"))
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tok2 = tok2->next();
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else
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--indent;
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}
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// Assigning iterator..
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if (Token::Match(tok2, "%varid% = %var% . begin ( )", iteratorid))
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{
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vectorname = tok2->strAt(2);
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invalidIterator = false;
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}
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// push_back on vector..
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if (vectorname.size() && Token::Match(tok2, (vectorname + " . push_front|push_back").c_str()))
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invalidIterator = true;
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// Using invalid iterator..
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if (invalidIterator)
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{
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if (Token::Match(tok2, "++|--|*|+|-|(|, %varid%", iteratorid))
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pushbackError(tok2, tok2->strAt(1));
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if (Token::Match(tok2, "%varid% ++|--|+|-", iteratorid))
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pushbackError(tok2, tok2->str());
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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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// Error message for bad iterator usage..
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void CheckStl::pushbackError(const Token *tok, const std::string &iterator_name)
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{
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reportError(tok, "error", "pushback", "After push_back or push_front, the iterator '" + iterator_name + "' may be invalid");
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}
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// Error message for bad iterator usage..
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void CheckStl::invalidPointerError(const Token *tok, const std::string &pointer_name)
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{
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reportError(tok, "error", "pushback", "Invalid pointer '" + pointer_name + "' after push_back / push_front");
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}
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void CheckStl::stlBoundries()
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{
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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// Declaring iterator..
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if (Token::simpleMatch(tok, "list <"))
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{
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while (tok && tok->str() != ">")
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tok = tok->next();
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if (!tok)
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break;
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if (Token::Match(tok, "> :: iterator|const_iterator %var% =|;"))
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{
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const unsigned int iteratorid(tok->tokAt(3)->varId());
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if (iteratorid == 0)
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continue;
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// Using "iterator < ..." is not allowed
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unsigned int indentlevel = 0;
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for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "{")
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++indentlevel;
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else if (tok2->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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else if (tok2->varId() == iteratorid && tok2->next() && tok2->next()->str() == "<")
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{
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stlBoundriesError(tok2);
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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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// Error message for bad boundry usage..
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void CheckStl::stlBoundriesError(const Token *tok)
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{
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reportError(tok, "error", "stlBoundries", "STL range check should be using != and not < since the order of the pointers isn't guaranteed");
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}
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