1100 lines
32 KiB
C++
1100 lines
32 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 "checkother.h"
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#include "mathlib.h"
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#include "tokenize.h"
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#include <algorithm>
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#include <list>
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#include <map>
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#include <sstream>
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#include <cstring>
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#include <cctype>
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//---------------------------------------------------------------------------
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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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CheckOther instance;
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}
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//---------------------------------------------------------------------------
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void CheckOther::WarningOldStylePointerCast()
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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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// Old style pointer casting..
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if (!Token::Match(tok, "( %type% * ) %var%"))
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continue;
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// Is "type" a class?
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const std::string pattern("class " + tok->next()->str());
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if (!Token::findmatch(_tokenizer->tokens(), pattern.c_str()))
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continue;
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cstyleCastError(tok);
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}
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}
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//---------------------------------------------------------------------------
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// Redundant code..
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//---------------------------------------------------------------------------
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void CheckOther::WarningRedundantCode()
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{
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// if (p) delete p
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if (tok->str() != "if")
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continue;
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const char *varname1 = NULL;
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const Token *tok2 = NULL;
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if (Token::Match(tok, "if ( %var% )"))
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{
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varname1 = tok->strAt(2);
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tok2 = tok->tokAt(4);
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}
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else if (Token::Match(tok, "if ( %var% != 0 )"))
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{
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varname1 = tok->strAt(2);
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tok2 = tok->tokAt(6);
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}
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if (varname1 == NULL || tok2 == NULL)
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continue;
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bool err = false;
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if (tok2->str() == "{")
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{
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tok2 = tok2->next();
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if (Token::Match(tok2, "delete %var% ; }"))
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{
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err = (strcmp(tok2->strAt(1), varname1) == 0);
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}
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else if (Token::Match(tok2, "delete [ ] %var% ; }"))
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{
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err = (strcmp(tok2->strAt(3), varname1) == 0);
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}
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else if (Token::Match(tok2, "free ( %var% ) ; }"))
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{
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err = (strcmp(tok2->strAt(2), varname1) == 0);
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}
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else if (Token::Match(tok2, "kfree ( %var% ) ; }"))
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{
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err = (strcmp(tok2->strAt(2), varname1) == 0);
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}
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}
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else
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{
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if (Token::Match(tok2, "delete %var% ;"))
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{
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err = (strcmp(tok2->strAt(1), varname1) == 0);
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}
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else if (Token::Match(tok2, "delete [ ] %var% ;"))
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{
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err = (strcmp(tok2->strAt(3), varname1) == 0);
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}
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else if (Token::Match(tok2, "free ( %var% ) ;"))
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{
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err = (strcmp(tok2->strAt(2), varname1) == 0);
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}
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else if (Token::Match(tok2, "kfree ( %var% ) ;"))
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{
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err = (strcmp(tok2->strAt(2), varname1) == 0);
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}
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}
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if (err)
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{
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redundantIfDelete0Error(tok);
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}
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}
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// Redundant condition
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// if (haystack.find(needle) != haystack.end())
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// haystack.remove(needle);
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redundantCondition2();
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}
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//---------------------------------------------------------------------------
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void CheckOther::redundantCondition2()
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{
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const char pattern[] = "if ( %var% . find ( %any% ) != %var% . end ( ) ) "
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"{|{|"
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" %var% . remove ( %any% ) ; "
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"}|}|";
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const Token *tok = Token::findmatch(_tokenizer->tokens(), pattern);
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while (tok)
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{
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bool b = Token::simpleMatch(tok->tokAt(15), "{");
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// Get tokens for the fields %var% and %any%
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const Token *var1 = tok->tokAt(2);
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const Token *any1 = tok->tokAt(6);
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const Token *var2 = tok->tokAt(9);
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const Token *var3 = tok->tokAt(b ? 16 : 15);
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const Token *any2 = tok->tokAt(b ? 20 : 19);
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// Check if all the "%var%" fields are the same and if all the "%any%" are the same..
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if (var1->str() == var2->str() &&
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var2->str() == var3->str() &&
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any1->str() == any2->str())
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{
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redundantIfRemoveError(tok);
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}
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tok = Token::findmatch(tok->next(), pattern);
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}
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// if (condition) ....
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//---------------------------------------------------------------------------
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void CheckOther::WarningIf()
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{
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if (ErrorLogger::ifNoAction(*_settings))
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{
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// Search for 'if (condition);'
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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, "if ("))
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continue;
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// Search for the end paranthesis for the condition..
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int parlevel = 0;
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for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "(")
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++parlevel;
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else if (tok2->str() == ")")
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{
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--parlevel;
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if (parlevel <= 0)
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{
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if (Token::Match(tok2, ") ; !!else"))
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{
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ifNoActionError(tok);
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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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}
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if (_settings->_checkCodingStyle)
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{
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// Search for 'a=b; if (a==b)'
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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// Begin statement?
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if (! Token::Match(tok, "[;{}]"))
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continue;
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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, "%var% = %var% ; if ( %var%"))
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continue;
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if (strcmp(tok->strAt(9), ")") != 0)
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continue;
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// var1 = var2 ; if ( var3 cond var4 )
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unsigned int var1 = tok->tokAt(0)->varId();
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unsigned int var2 = tok->tokAt(2)->varId();
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unsigned int var3 = tok->tokAt(6)->varId();
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const char *cond = tok->strAt(7);
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unsigned int var4 = tok->tokAt(8)->varId();
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if (var1 == 0 || var2 == 0 || var3 == 0 || var4 == 0)
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continue;
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if (var1 == var2 || var3 == var4)
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continue;
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// Check that var3 is equal with either var1 or var2
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if (var1 != var3 && var2 != var3)
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continue;
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// Check that var4 is equal with either var1 or var2
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if (var1 != var4 && var2 != var4)
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continue;
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// Check that there is a condition..
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static const char * const p[6] = {"==", "<=", ">=", "!=", "<", ">"};
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bool iscond = false;
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for (int i = 0; i < 6; i++)
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{
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if (strcmp(cond, p[i]) == 0)
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{
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iscond = true;
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break;
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}
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}
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if (!iscond)
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continue;
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// If there are casting involved it's hard to know if the
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// condition is true or false
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const Token *vardecl1 = Token::findmatch(_tokenizer->tokens(), "; %type% %varid% ;", var1);
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if (!vardecl1)
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continue;
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const Token *vardecl2 = Token::findmatch(_tokenizer->tokens(), "; %type% %varid% ;", var2);
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if (!vardecl2)
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continue;
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// variable 1 & 2 must be the same type..
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if (vardecl1->next()->str() != vardecl2->next()->str())
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continue;
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// we found the error. Report.
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bool b = false;
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for (int i = 0; i < 6; i++)
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{
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if (strcmp(cond, p[i]) == 0)
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b = (i < 3);
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}
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conditionAlwaysTrueFalse(tok->tokAt(4), b ? "True" : "False");
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}
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}
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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// strtol(str, 0, radix) <- radix must be 0 or 2-36
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//---------------------------------------------------------------------------
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void CheckOther::InvalidFunctionUsage()
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{
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// strtol and strtoul..
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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if ((tok->str() != "strtol") && (tok->str() != "strtoul"))
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continue;
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// Locate the third parameter of the function call..
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int parlevel = 0;
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int param = 1;
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for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next())
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{
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if (Token::simpleMatch(tok2, "("))
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++parlevel;
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else if (Token::simpleMatch(tok2, ")"))
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--parlevel;
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else if (parlevel == 1 && Token::simpleMatch(tok2, ","))
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{
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++param;
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if (param == 3)
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{
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if (Token::Match(tok2, ", %num% )"))
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{
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int radix = MathLib::toLongNumber(tok2->next()->str());
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if (!(radix == 0 || (radix >= 2 && radix <= 36)))
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{
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dangerousUsageStrtolError(tok2);
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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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// sprintf|snprintf overlapping data
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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// Get variable id of target buffer..
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unsigned int varid = 0;
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if (Token::Match(tok, "sprintf|snprintf ( %var% ,"))
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varid = tok->tokAt(2)->varId();
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else if (Token::Match(tok, "sprintf|snprintf ( %var% . %var% ,"))
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varid = tok->tokAt(4)->varId();
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if (varid == 0)
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continue;
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// goto ","
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const Token *tok2 = tok->tokAt(3);
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while (tok2 && tok2->str() != ",")
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tok2 = tok2->next();
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// is any source buffer overlapping the target buffer?
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int parlevel = 0;
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while ((tok2 = tok2->next()) != NULL)
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{
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if (tok2->str() == "(")
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++parlevel;
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else if (tok2->str() == ")")
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{
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--parlevel;
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if (parlevel < 0)
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break;
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}
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else if (parlevel == 0 && Token::Match(tok2, ", %varid% [,)]", varid))
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{
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sprintfOverlappingDataError(tok2->next(), tok2->next()->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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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Check for unsigned divisions
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//---------------------------------------------------------------------------
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void CheckOther::CheckUnsignedDivision()
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{
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// Check for "ivar / uvar" and "uvar / ivar"
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std::map<std::string, char> varsign;
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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, "[{};(,] %type% %var% [;=,)]"))
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{
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const char *type = tok->strAt(1);
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if (strcmp(type, "char") == 0 || strcmp(type, "short") == 0 || strcmp(type, "int") == 0)
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varsign[tok->strAt(2)] = 's';
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}
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else if (Token::Match(tok, "[{};(,] unsigned %type% %var% [;=,)]"))
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varsign[tok->strAt(3)] = 'u';
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else if (!Token::Match(tok, "[).]") && Token::Match(tok->next(), "%var% / %var%"))
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{
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if (ErrorLogger::udivWarning(*_settings))
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{
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const char *varname1 = tok->strAt(1);
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const char *varname2 = tok->strAt(3);
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char sign1 = varsign[varname1];
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char sign2 = varsign[varname2];
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if (sign1 && sign2 && sign1 != sign2)
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{
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// One of the operands are signed, the other is unsigned..
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udivWarning(tok->next());
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}
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}
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}
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else if (!Token::Match(tok, "[).]") && Token::Match(tok->next(), "%var% / %num%"))
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{
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if (tok->strAt(3)[0] == '-' && ErrorLogger::udivError())
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{
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const char *varname1 = tok->strAt(1);
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char sign1 = varsign[varname1];
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if (sign1 == 'u')
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{
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udivError(tok->next());
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}
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}
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}
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else if (Token::Match(tok, "[([=*/+-,] %num% / %var%"))
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{
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if (tok->strAt(1)[0] == '-' && ErrorLogger::udivError())
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{
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const char *varname2 = tok->strAt(3);
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char sign2 = varsign[varname2];
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if (sign2 == 'u')
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{
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udivError(tok->next());
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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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//---------------------------------------------------------------------------
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// Check scope of variables..
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//---------------------------------------------------------------------------
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void CheckOther::CheckVariableScope()
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{
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// Walk through all tokens..
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bool func = false;
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int indentlevel = 0;
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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// Skip class and struct declarations..
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if ((tok->str() == "class") || (tok->str() == "struct"))
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{
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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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{
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int indentlevel2 = 0;
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for (tok = tok2; tok; tok = tok->next())
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{
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if (tok->str() == "{")
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{
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++indentlevel2;
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}
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if (tok->str() == "}")
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{
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--indentlevel2;
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if (indentlevel2 <= 0)
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{
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tok = tok->next();
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break;
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}
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}
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}
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break;
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}
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if (Token::Match(tok2, "[,);]"))
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{
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break;
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}
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}
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if (! tok)
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break;
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}
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if (tok->str() == "{")
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{
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++indentlevel;
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}
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if (tok->str() == "}")
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{
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--indentlevel;
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if (indentlevel == 0)
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func = false;
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}
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if (indentlevel == 0 && Token::simpleMatch(tok, ") {"))
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{
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func = true;
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}
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if (indentlevel > 0 && func && Token::Match(tok, "[{};]"))
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{
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// First token of statement..
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const Token *tok1 = tok->next();
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if (! tok1)
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continue;
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if ((tok1->str() == "return") ||
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(tok1->str() == "throw") ||
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(tok1->str() == "delete") ||
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(tok1->str() == "goto") ||
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(tok1->str() == "else"))
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continue;
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// Variable declaration?
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if (Token::Match(tok1, "%var% %var% ;") ||
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Token::Match(tok1, "%var% %var% ="))
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{
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CheckVariableScope_LookupVar(tok1, tok1->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 CheckOther::CheckVariableScope_LookupVar(const Token *tok1, const char varname[])
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{
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const Token *tok = tok1;
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// Skip the variable declaration..
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while (tok && !Token::simpleMatch(tok, ";"))
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tok = tok->next();
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// Check if the variable is used in this indentlevel..
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bool used = false, used1 = false;
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int indentlevel = 0;
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int parlevel = 0;
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bool for_or_while = false;
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while (indentlevel >= 0 && tok)
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{
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if (tok->str() == "{")
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{
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++indentlevel;
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}
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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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{
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if (for_or_while && used)
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return;
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used1 |= used;
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used = false;
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}
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}
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else if (tok->str() == "(")
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|
{
|
|
++parlevel;
|
|
}
|
|
|
|
else if (tok->str() == ")")
|
|
{
|
|
--parlevel;
|
|
}
|
|
|
|
// Bail out if references are used
|
|
else if (Token::simpleMatch(tok, (std::string("& ") + varname).c_str()))
|
|
{
|
|
return;
|
|
}
|
|
|
|
else if (tok->str() == varname)
|
|
{
|
|
if (indentlevel == 0 || used1)
|
|
return;
|
|
used = true;
|
|
}
|
|
|
|
else if (indentlevel == 0)
|
|
{
|
|
if ((tok->str() == "for") || (tok->str() == "while"))
|
|
for_or_while = true;
|
|
if (parlevel == 0 && (tok->str() == ";"))
|
|
for_or_while = false;
|
|
}
|
|
|
|
tok = tok->next();
|
|
}
|
|
|
|
// Warning if "used" is true
|
|
variableScopeError(tok1, varname);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check for constant function parameters
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::CheckConstantFunctionParameter()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "[,(] const std :: %type% %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(5));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const %type% %var% [,)]"))
|
|
{
|
|
// Check if type is a struct or class.
|
|
const std::string pattern(std::string("class|struct ") + tok->strAt(2));
|
|
if (Token::findmatch(_tokenizer->tokens(), pattern.c_str()))
|
|
{
|
|
passedByValueError(tok, tok->strAt(3));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check that all struct members are used
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::CheckStructMemberUsage()
|
|
{
|
|
const char *structname = 0;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->fileIndex() != 0)
|
|
continue;
|
|
|
|
if (Token::Match(tok, "struct|union %type% {"))
|
|
{
|
|
structname = tok->strAt(1);
|
|
|
|
// Bail out if struct/union contain any functions
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "(")
|
|
{
|
|
structname = 0;
|
|
break;
|
|
}
|
|
|
|
if (tok2->str() == "}")
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (tok->str() == "}")
|
|
structname = 0;
|
|
|
|
if (structname && Token::Match(tok, "[{;]"))
|
|
{
|
|
const char *varname = 0;
|
|
if (Token::Match(tok->next(), "%type% %var% [;[]"))
|
|
varname = tok->strAt(2);
|
|
else if (Token::Match(tok->next(), "%type% %type% %var% [;[]"))
|
|
varname = tok->strAt(3);
|
|
else if (Token::Match(tok->next(), "%type% * %var% [;[]"))
|
|
varname = tok->strAt(3);
|
|
else if (Token::Match(tok->next(), "%type% %type% * %var% [;[]"))
|
|
varname = tok->strAt(4);
|
|
else
|
|
continue;
|
|
|
|
const std::string usagePattern(". " + std::string(varname));
|
|
bool used = false;
|
|
for (const Token *tok2 = _tokenizer->tokens(); tok2; tok2 = tok2->next())
|
|
{
|
|
if (Token::simpleMatch(tok2, usagePattern.c_str()))
|
|
{
|
|
used = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (! used)
|
|
{
|
|
unusedStructMemberError(tok->next(), structname, varname);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check usage of char variables..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::CheckCharVariable()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Declaring the variable..
|
|
if (Token::Match(tok, "[{};(,] signed| char %var% [;=,)]"))
|
|
{
|
|
// Set tok to point to the variable name
|
|
tok = tok->tokAt(2);
|
|
if (tok->str() == "char")
|
|
tok = tok->next();
|
|
|
|
// Check usage of char variable..
|
|
int indentlevel = 0;
|
|
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "{")
|
|
++indentlevel;
|
|
|
|
else if (tok2->str() == "}")
|
|
{
|
|
--indentlevel;
|
|
if (indentlevel <= 0)
|
|
break;
|
|
}
|
|
|
|
else if (tok2->str() == "return")
|
|
continue;
|
|
|
|
std::string temp = "%var% [ " + tok->str() + " ]";
|
|
if ((tok2->str() != ".") && Token::Match(tok2->next(), temp.c_str()))
|
|
{
|
|
charArrayIndexError(tok2->next());
|
|
break;
|
|
}
|
|
|
|
std::string tempFirst = "%var% [&|] " + tok->str();
|
|
std::string tempSecond = tok->str() + " [&|]";
|
|
if (Token::Match(tok2, tempFirst.c_str()) || Token::Match(tok2, tempSecond.c_str()))
|
|
{
|
|
charBitOpError(tok2);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Incomplete statement..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::CheckIncompleteStatement()
|
|
{
|
|
int parlevel = 0;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "(")
|
|
++parlevel;
|
|
else if (tok->str() == ")")
|
|
--parlevel;
|
|
|
|
if (parlevel != 0)
|
|
continue;
|
|
|
|
if (Token::simpleMatch(tok, "= {"))
|
|
{
|
|
/* We are in an assignment, so it's not a statement.
|
|
* Skip until ";" */
|
|
|
|
while (!Token::simpleMatch(tok, ";"))
|
|
{
|
|
int level = 0;
|
|
do
|
|
{
|
|
if (tok->str() == "(" || tok->str() == "{")
|
|
++level;
|
|
else if (tok->str() == ")" || tok->str() == "}")
|
|
--level;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok == NULL)
|
|
return;
|
|
}
|
|
while (level > 0);
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
if (Token::Match(tok, "[;{}] %str%") && !Token::Match(tok->tokAt(2), "[,}]"))
|
|
{
|
|
constStatementError(tok->next(), "string");
|
|
}
|
|
|
|
if (Token::Match(tok, "[;{}] %num%") && !Token::Match(tok->tokAt(2), "[,}]"))
|
|
{
|
|
constStatementError(tok->next(), "numeric");
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// str plus char
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::strPlusChar()
|
|
{
|
|
bool charVars[10000] = {0};
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Declaring char variable..
|
|
if (Token::Match(tok, "char %var% [;=]"))
|
|
{
|
|
unsigned int varid = tok->next()->varId();
|
|
if (varid > 0 && varid < 10000)
|
|
charVars[varid] = true;
|
|
}
|
|
|
|
//
|
|
else if (Token::Match(tok, "[=(] %str% + %any%"))
|
|
{
|
|
// char constant..
|
|
const char *s = tok->strAt(3);
|
|
if (*s == '\'')
|
|
strPlusChar(tok->next());
|
|
|
|
// char variable..
|
|
unsigned int varid = tok->tokAt(3)->varId();
|
|
if (varid > 0 && varid < 10000 && charVars[varid])
|
|
strPlusChar(tok->next());
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void CheckOther::returnPointerToStackData()
|
|
{
|
|
bool infunc = false;
|
|
int indentlevel = 0;
|
|
std::list<unsigned int> arrayVar;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Is there a function declaration for a function that returns a pointer?
|
|
if (!infunc && (Token::Match(tok, "%type% * %var% (") || Token::Match(tok, "%type% * %var% :: %var% (")))
|
|
{
|
|
for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == ")")
|
|
{
|
|
tok = tok2;
|
|
break;
|
|
}
|
|
}
|
|
if (Token::simpleMatch(tok, ") {"))
|
|
{
|
|
infunc = true;
|
|
indentlevel = 0;
|
|
arrayVar.clear();
|
|
}
|
|
}
|
|
|
|
// Parsing a function that returns a pointer..
|
|
if (infunc)
|
|
{
|
|
if (tok->str() == "{")
|
|
++indentlevel;
|
|
else if (tok->str() == "}")
|
|
{
|
|
--indentlevel;
|
|
if (indentlevel <= 0)
|
|
infunc = false;
|
|
continue;
|
|
}
|
|
|
|
// Declaring a local array..
|
|
if (Token::Match(tok, "[;{}] %type% %var% ["))
|
|
{
|
|
arrayVar.push_back(tok->tokAt(2)->varId());
|
|
}
|
|
|
|
// Return pointer to local array variable..
|
|
if (Token::Match(tok, "return %var% ;"))
|
|
{
|
|
unsigned int varid = tok->next()->varId();
|
|
if (varid > 0 && std::find(arrayVar.begin(), arrayVar.end(), varid) != arrayVar.end())
|
|
returnLocalVariable(tok);
|
|
}
|
|
}
|
|
|
|
// Declaring array variable..
|
|
|
|
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void CheckOther::nullPointer()
|
|
{
|
|
// Locate insufficient null-pointer handling after loop
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (! Token::Match(tok, "while ( %var% )"))
|
|
continue;
|
|
|
|
const unsigned int varid(tok->tokAt(2)->varId());
|
|
if (varid == 0)
|
|
continue;
|
|
|
|
// Locate the end of the while loop..
|
|
const Token *tok2 = tok->tokAt(4);
|
|
int indentlevel = 0;
|
|
while (tok2)
|
|
{
|
|
if (tok2->str() == "{")
|
|
++indentlevel;
|
|
else if (tok2->str() == "}")
|
|
{
|
|
if (indentlevel <= 1)
|
|
break;
|
|
--indentlevel;
|
|
}
|
|
else if (indentlevel == 0 && tok2->str() == ";")
|
|
break;
|
|
tok2 = tok2->next();
|
|
}
|
|
|
|
// Goto next token
|
|
tok2 = tok2 ? tok2->next() : 0;
|
|
|
|
// Check if the variable is dereferenced..
|
|
while (tok2)
|
|
{
|
|
if (tok2->str() == "{" || tok2->str() == "}")
|
|
break;
|
|
|
|
if (tok2->varId() == varid)
|
|
{
|
|
if (tok2->next()->str() == "." || Token::Match(tok2->next(), "= %varid% .", varid))
|
|
{
|
|
// Is this variable a pointer?
|
|
const Token *tok3 = Token::findmatch(_tokenizer->tokens(), "%type% * %varid% [;)]", varid);
|
|
if (!tok3)
|
|
break;
|
|
|
|
if (!tok3->previous() ||
|
|
Token::Match(tok3->previous(), "[({};]") ||
|
|
tok3->previous()->isName())
|
|
{
|
|
nullPointerError(tok2);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
tok2 = tok2->next();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void CheckOther::CheckZeroDivision()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::simpleMatch(tok, "/ 0"))
|
|
zerodivError(tok);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
void CheckOther::cstyleCastError(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "cstyleCast", "C-style pointer casting");
|
|
}
|
|
|
|
void CheckOther::redundantIfDelete0Error(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "redundantIfDelete0", "Redundant condition. It is safe to deallocate a NULL pointer");
|
|
}
|
|
|
|
void CheckOther::redundantIfRemoveError(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "redundantIfRemove", "Redundant condition. The remove function in the STL will not do anything if element doesn't exist");
|
|
}
|
|
|
|
void CheckOther::dangerousUsageStrtolError(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "dangerousUsageStrtol", "Invalid radix in call to strtol or strtoul. Must be 0 or 2-36");
|
|
}
|
|
|
|
void CheckOther::ifNoActionError(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "ifNoAction", "Found redundant if condition - 'if (condition);'");
|
|
}
|
|
|
|
void CheckOther::sprintfOverlappingDataError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, "error", "sprintfOverlappingData", "Overlapping data buffer " + varname);
|
|
}
|
|
|
|
void CheckOther::udivError(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "udivError", "Unsigned division. The result will be wrong.");
|
|
}
|
|
|
|
void CheckOther::udivWarning(const Token *tok)
|
|
{
|
|
reportError(tok, "all style", "udivWarning", "Warning: Division with signed and unsigned operators");
|
|
}
|
|
|
|
void CheckOther::unusedStructMemberError(const Token *tok, const std::string &structname, const std::string &varname)
|
|
{
|
|
reportError(tok, "style", "unusedStructMember", "struct or union member '" + structname + "::" + varname + "' is never used");
|
|
}
|
|
|
|
void CheckOther::passedByValueError(const Token *tok, const std::string &parname)
|
|
{
|
|
reportError(tok, "style", "passedByValue", "Function parameter '" + parname + "' is passed by value. It could be passed by reference instead.");
|
|
}
|
|
|
|
void CheckOther::constStatementError(const Token *tok, const std::string &type)
|
|
{
|
|
reportError(tok, "style", "constStatement", "Redundant code: Found a statement that begins with " + type + " constant");
|
|
}
|
|
|
|
void CheckOther::charArrayIndexError(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "charArrayIndex", "Warning - using char variable as array index");
|
|
}
|
|
|
|
void CheckOther::charBitOpError(const Token *tok)
|
|
{
|
|
reportError(tok, "style", "charBitOp", "Warning - using char variable in bit operation");
|
|
}
|
|
|
|
void CheckOther::variableScopeError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, "style", "variableScope", "The scope of the variable " + varname + " can be limited");
|
|
}
|
|
|
|
void CheckOther::conditionAlwaysTrueFalse(const Token *tok, const std::string &truefalse)
|
|
{
|
|
reportError(tok, "style", "conditionAlwaysTrueFalse", "Condition is always " + truefalse);
|
|
}
|
|
|
|
void CheckOther::strPlusChar(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "strPlusChar", "Unusual pointer arithmetic");
|
|
}
|
|
|
|
void CheckOther::returnLocalVariable(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "returnLocalVariable", "Returning pointer to local array variable");
|
|
}
|
|
|
|
void CheckOther::nullPointerError(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "nullPointer", "Possible null pointer dereference");
|
|
}
|
|
|
|
void CheckOther::zerodivError(const Token *tok)
|
|
{
|
|
reportError(tok, "error", "zerodiv", "Division by zero");
|
|
}
|