110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
//---------------------------------------------------------------------------
|
|
// You should use ++ and -- as prefix whenever possible as these are more
|
|
// efficient than postfix operators
|
|
//---------------------------------------------------------------------------
|
|
|
|
#include "checkpostfixoperator.h"
|
|
#include "symboldatabase.h"
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
// Register this check class (by creating a static instance of it)
|
|
namespace
|
|
{
|
|
CheckPostfixOperator instance;
|
|
}
|
|
|
|
void CheckPostfixOperator::postfixOperator()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const Token *tok = _tokenizer->tokens();
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
// prevent crash if first token is ++ or --
|
|
if (Token::Match(tok, "++|--"))
|
|
tok = tok->next();
|
|
|
|
for (; tok; tok = tok->next())
|
|
{
|
|
bool result = false;
|
|
if (Token::Match(tok, "++|--"))
|
|
{
|
|
if (Token::Match(tok->previous()->previous(), ";|{|}") && Token::Match(tok->next(), ";|)|,"))
|
|
{
|
|
result = true;
|
|
}
|
|
else if (tok->strAt(-2) == ",")
|
|
{
|
|
int i(1);
|
|
while (tok->strAt(i) != ")" && tok->tokAt(i) != 0)
|
|
{
|
|
if (tok->strAt(i) == ";")
|
|
{
|
|
result = true;
|
|
break;
|
|
}
|
|
++i;
|
|
}
|
|
}
|
|
else if (tok->strAt(-2) == "<<" && tok->strAt(1) == "<<")
|
|
{
|
|
result = true;
|
|
}
|
|
}
|
|
|
|
if (result && tok->previous()->varId())
|
|
{
|
|
const Variable *var = symbolDatabase->getVariableFromVarId(tok->previous()->varId());
|
|
if (!var || !Token::Match(var->typeEndToken(), "%type%"))
|
|
continue;
|
|
|
|
const Token *decltok = var->nameToken();
|
|
|
|
if (Token::Match(decltok->previous(), "iterator|const_iterator|reverse_iterator|const_reverse_iterator"))
|
|
{
|
|
// the variable is an iterator
|
|
postfixOperatorError(tok);
|
|
}
|
|
else if (var->type())
|
|
{
|
|
// the variable is an instance of class
|
|
postfixOperatorError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
void CheckPostfixOperator::postfixOperatorError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::performance, "postfixOperator",
|
|
"Prefer prefix ++/-- operators for non-primitive types.\n"
|
|
"Prefix ++/-- operators should be preferred for non-primitive types. "
|
|
"Pre-increment/decrement can be more efficient than "
|
|
"post-increment/decrement. Post-increment/decrement usually "
|
|
"involves keeping a copy of the previous value around and "
|
|
"adds a little extra code.");
|
|
}
|