912 lines
29 KiB
C++
912 lines
29 KiB
C++
/*
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* cppcheck - c/c++ syntax checking
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* Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam
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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 <list>
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#include <map>
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#include <sstream>
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#include <stdlib.h> // <- atoi
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#include <cstring>
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#include <cctype>
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Warning on C-Style casts.. p = (kalle *)foo;
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//---------------------------------------------------------------------------
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CheckOther::CheckOther( const Tokenizer *tokenizer, ErrorLogger *errorLogger )
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{
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_tokenizer = tokenizer;
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_errorLogger = errorLogger;
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}
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CheckOther::~CheckOther()
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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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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok) << ": C-style pointer casting";
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_errorLogger->reportErr(ostr.str());
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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% != NULL )"))
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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(1),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(1),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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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok) << ": Redundant condition. It is safe to deallocate a NULL pointer";
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_errorLogger->reportErr(ostr.str());
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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::Match( 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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std::ostringstream errmsg;
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errmsg << _tokenizer->fileLine(tok)
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<< ": Redundant condition found. The remove function in the STL will not do anything if element doesn't exist";
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_errorLogger->reportErr(errmsg.str());
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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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// 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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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok) << ": Found \"if (condition);\"";
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_errorLogger->reportErr(ostr.str());
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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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// 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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const char *var1 = tok->strAt( 0);
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const char *var2 = tok->strAt( 2);
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const char *var3 = tok->strAt( 6);
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const char *cond = tok->strAt( 7);
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const char *var4 = tok->strAt( 8);
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// Check that var3 is equal with either var1 or var2
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if (strcmp(var1,var3) && strcmp(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 (strcmp(var1,var4) && strcmp(var2,var4))
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continue;
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// Check that there is a condition..
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const char *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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break;
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// we found the error. Report.
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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok->tokAt(4)) << ": The condition is always ";
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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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ostr << (i < 3 ? "True" : "False");
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}
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_errorLogger->reportErr(ostr.str());
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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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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::Match(tok2, "(") )
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++parlevel;
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else if (Token::Match(tok2, ")"))
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--parlevel;
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else if (parlevel == 1 && Token::Match(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 = atoi(tok2->strAt( 1));
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if (!(radix==0 || (radix>=2 && radix<=36)))
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{
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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok2) << ": Invalid radix in call to strtol or strtoul. Must be 0 or 2-36";
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_errorLogger->reportErr(ostr.str());
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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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}
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Assignment in condition
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//---------------------------------------------------------------------------
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void CheckOther::CheckIfAssignment()
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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, "if ( %var% = %num% )") ||
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Token::Match(tok, "if ( %var% = %str% )") ||
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Token::Match(tok, "if ( %var% = %var% )") )
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{
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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok) << ": Possible bug. Should it be '==' instead of '='?";
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_errorLogger->reportErr(ostr.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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// 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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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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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok->next()) << ": Warning: Division with signed and unsigned operators";
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_errorLogger->reportErr(ostr.str());
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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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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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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok->next()) << ": Unsigned division. The result will be wrong.";
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_errorLogger->reportErr(ostr.str());
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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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const char *varname2 = tok->strAt(4);
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char sign2 = varsign[varname2];
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if ( sign2 == 'u' )
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{
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std::ostringstream ostr;
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ostr << _tokenizer->fileLine(tok->next()) << ": Unsigned division. The result will be wrong.";
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_errorLogger->reportErr(ostr.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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// 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::Match(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() == "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::Match(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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{
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++parlevel;
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}
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else if ( tok->str() == ")" )
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{
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--parlevel;
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}
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else if ( tok->str() == varname )
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{
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if ( indentlevel == 0 || used1 )
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return;
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used = true;
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}
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else if ( indentlevel==0 )
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{
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if ( (tok->str() == "for") || (tok->str() == "while") )
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for_or_while = true;
|
|
if ( parlevel == 0 && (tok->str() == ";") )
|
|
for_or_while = false;
|
|
}
|
|
|
|
tok = tok->next();
|
|
}
|
|
|
|
// Warning if "used" is true
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok1) << " The scope of the variable '" << varname << "' can be limited";
|
|
_errorLogger->reportErr( errmsg.str() );
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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% [,)]") )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok) << " " << tok->strAt(5) << " is passed by value, it could be passed by reference/pointer instead";
|
|
_errorLogger->reportErr( errmsg.str() );
|
|
}
|
|
|
|
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()) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok) << " " << tok->strAt(3) << " is passed by value, it could be passed by reference/pointer instead";
|
|
_errorLogger->reportErr( errmsg.str() );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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 ( tok->str() == "}" )
|
|
structname = 0;
|
|
if ( Token::Match(tok, "struct %type% {") )
|
|
structname = tok->strAt( 1);
|
|
|
|
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( 2 );
|
|
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 char *varnames[2];
|
|
varnames[0] = varname;
|
|
varnames[1] = 0;
|
|
bool used = false;
|
|
for ( const Token *tok2 = _tokenizer->tokens(); tok2; tok2 = tok2->next() )
|
|
{
|
|
if ( tok->fileIndex() != 0 )
|
|
continue;
|
|
|
|
if (Token::Match(tok2, ". %var1%", 0, varnames))
|
|
{
|
|
if ( Token::simpleMatch(tok2->tokAt(2), "=") )
|
|
continue;
|
|
used = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( ! used )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok) << ": struct member '" << structname << "::" << varname << "' is never read";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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, "[{};(,] char %var% [;=,)]") )
|
|
{
|
|
// Set tok to point to the variable name
|
|
tok = tok->tokAt( 2 );
|
|
|
|
// 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;
|
|
}
|
|
|
|
if ((tok2->str() != ".") && Token::Match(tok2->next(), "%var% [ %varid% ]", tok->varId()))
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok2->next()) << ": Warning - using char variable as array index";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
break;
|
|
}
|
|
|
|
if ( Token::Match(tok2, "%var% [&|] %varid%", tok->varId()) || Token::Match(tok2, "%varid% [&|]", tok->varId()) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok2) << ": Warning - using char variable in bit operation";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
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 ( (tok->str() != "#") && Token::Match(tok->next(),"; %str%") && !Token::Match(tok->tokAt(3), ",") )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok->next()) << ": Redundant code: Found a statement that begins with string constant";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
|
|
if ( !Token::Match(tok,"#") && Token::Match(tok->next(),"; %num%") && !Token::Match(tok->tokAt(3), ",") )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok->next()) << ": Redundant code: Found a statement that begins with numeric constant";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Unreachable code below a 'return'
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::unreachableCode()
|
|
{
|
|
const Token *tok = Token::findmatch( _tokenizer->tokens(), "[;{}] return" );
|
|
while ( tok )
|
|
{
|
|
// Goto the 'return' token
|
|
tok = tok->next();
|
|
|
|
// Locate the end of the 'return' statement
|
|
while ( tok && ! Token::Match(tok, ";") )
|
|
tok = tok->next();
|
|
while ( tok && Token::Match(tok->next(), ";") )
|
|
tok = tok->next();
|
|
|
|
// If there is a statement below the return it is unreachable
|
|
if (!Token::Match(tok, "; case|default|}|#") && !Token::Match(tok, "; %var% :"))
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok->next()) << ": Unreachable code below a 'return'";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
|
|
// Find the next 'return' statement
|
|
tok = Token::findmatch( tok, "[;{}] return" );
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Usage of function variables
|
|
//---------------------------------------------------------------------------
|
|
|
|
static bool isOp(const Token *tok)
|
|
{
|
|
return bool(tok &&
|
|
(tok->str() == "&&" ||
|
|
tok->str() == "||" ||
|
|
tok->str() == "==" ||
|
|
tok->str() == "!=" ||
|
|
tok->str() == "<" ||
|
|
tok->str() == "<=" ||
|
|
tok->str() == ">" ||
|
|
tok->str() == ">=" ||
|
|
tok->str() == "<<" ||
|
|
Token::Match(tok, "[+-*/&|,[])]")));
|
|
}
|
|
|
|
void CheckOther::functionVariableUsage()
|
|
{
|
|
// Parse all executing scopes..
|
|
const Token *tok1 = _tokenizer->tokens();
|
|
while ((tok1 = Token::findmatch( tok1->next(), ") const| {" )) != NULL)
|
|
{
|
|
// Varname, usage {1=declare, 2=read, 4=write}
|
|
std::map<std::string, unsigned int> varUsage;
|
|
static const unsigned int USAGE_DECLARE = 1;
|
|
static const unsigned int USAGE_READ = 2;
|
|
static const unsigned int USAGE_WRITE = 4;
|
|
|
|
int indentlevel = 0;
|
|
for ( const Token *tok = tok1; tok; tok = tok->next() )
|
|
{
|
|
if ( tok->str() == "{" )
|
|
++indentlevel;
|
|
else if ( tok->str() == "}" )
|
|
{
|
|
--indentlevel;
|
|
if ( indentlevel <= 0 )
|
|
break;
|
|
}
|
|
|
|
if ( Token::Match(tok, "[;{}] bool|char|short|int|long|float|double %var% ;|=") )
|
|
varUsage[ tok->strAt(2) ] = USAGE_DECLARE;
|
|
|
|
if ( Token::Match(tok, "[;{}] bool|char|short|int|long|float|double * %var% ;|=") )
|
|
varUsage[ tok->strAt(3) ] = USAGE_DECLARE;
|
|
|
|
if ( Token::Match(tok, "delete|return %var%") )
|
|
varUsage[ tok->strAt(1) ] |= USAGE_READ;
|
|
|
|
if ( Token::Match(tok, "%var% =") )
|
|
varUsage[ tok->str() ] |= USAGE_WRITE;
|
|
|
|
if ( Token::Match(tok, "else %var% =") )
|
|
varUsage[ tok->strAt(1) ] |= USAGE_WRITE;
|
|
|
|
if ( Token::Match(tok, ">>|& %var%") )
|
|
varUsage[ tok->strAt(1) ] |= USAGE_WRITE;
|
|
|
|
if ((Token::Match(tok,"[(=&!]") || isOp(tok)) && Token::Match(tok->next(), "%var%"))
|
|
varUsage[ tok->strAt(1) ] |= USAGE_READ;
|
|
|
|
if (Token::Match(tok, "-=|+=|*=|/= %var%"))
|
|
varUsage[ tok->strAt(1) ] |= USAGE_READ;
|
|
|
|
if (Token::Match(tok, "%var%") && (tok->next()->str()==")" || isOp(tok->next())))
|
|
varUsage[ tok->str() ] |= USAGE_READ;
|
|
|
|
if ( Token::Match(tok, "[(,] %var% [,)]") )
|
|
varUsage[ tok->strAt(1) ] |= USAGE_WRITE;
|
|
}
|
|
|
|
// Check usage of all variables in the current scope..
|
|
for ( std::map<std::string, unsigned int>::const_iterator it = varUsage.begin(); it != varUsage.end(); ++it )
|
|
{
|
|
std::string varname = it->first;
|
|
unsigned int usage = it->second;
|
|
|
|
if (!std::isalpha(varname[0]))
|
|
continue;
|
|
|
|
if ( ! ( usage & USAGE_DECLARE ) )
|
|
continue;
|
|
|
|
if ( usage == USAGE_DECLARE )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok1->next()) << ": Unused variable '" << varname << "'";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
|
|
else if ( ! (usage & USAGE_READ) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok1->next()) << ": Variable '" << varname << "' is assigned a value that is never used";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
|
|
else if ( ! (usage & USAGE_WRITE) )
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << _tokenizer->fileLine(tok1->next()) << ": Variable '" << varname << "' is not assigned a value";
|
|
_errorLogger->reportErr(errmsg.str());
|
|
}
|
|
}
|
|
}
|
|
}
|