2785 lines
92 KiB
C++
2785 lines
92 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2011 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 "symboldatabase.h"
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#include <cctype> // std::isupper
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#include <cmath> // fabs()
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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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if (!_settings->_checkCodingStyle ||
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(_tokenizer->tokens() && _tokenizer->fileLine(_tokenizer->tokens()).find(".cpp") == std::string::npos))
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return;
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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, "( const| %type% * ) %var%") &&
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!Token::Match(tok, "( const| %type% * ) (| new"))
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continue;
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int addToIndex = 0;
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if (tok->tokAt(1)->str() == "const")
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addToIndex = 1;
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if (tok->tokAt(4 + addToIndex)->str() == "const")
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continue;
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// Is "type" a class?
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const std::string pattern("class " + tok->tokAt(1 + addToIndex)->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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// fflush(stdin) <- fflush only applies to output streams in ANSI C
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//---------------------------------------------------------------------------
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void CheckOther::checkFflushOnInputStream()
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{
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const Token *tok = _tokenizer->tokens();
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while (tok && ((tok = Token::findmatch(tok, "fflush ( stdin )")) != NULL))
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{
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fflushOnInputStreamError(tok, tok->strAt(2));
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tok = tok->tokAt(4);
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}
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}
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//---------------------------------------------------------------------------
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// switch (x)
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// {
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// case 2:
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// y = a; // <- this assignment is redundant
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// case 3:
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// y = b; // <- case 2 falls through and sets y twice
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// }
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//---------------------------------------------------------------------------
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void CheckOther::checkRedundantAssignmentInSwitch()
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{
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const char switchPattern[] = "switch ( %any% ) { case";
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const char breakPattern[] = "break|continue|return|exit|goto";
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const char functionPattern[] = "%var% (";
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// Find the beginning of a switch. E.g.:
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// switch (var) { ...
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const Token *tok = Token::findmatch(_tokenizer->tokens(), switchPattern);
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while (tok)
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{
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// Check the contents of the switch statement
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std::map<unsigned int, const Token*> varsAssigned;
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int indentLevel = 0;
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for (const Token *tok2 = tok->tokAt(5); tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "{")
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{
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// Inside a conditional or loop. Don't mark variable accesses as being redundant. E.g.:
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// case 3: b = 1;
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// case 4: if (a) { b = 2; } // Doesn't make the b=1 redundant because it's conditional
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if (Token::Match(tok2->previous(), ")|else {") && tok2->link())
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{
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const Token* endOfConditional = tok2->link();
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for (const Token* tok3 = tok2; tok3 != endOfConditional; tok3 = tok3->next())
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{
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if (tok3->varId() != 0)
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varsAssigned.erase(tok3->varId());
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else if (Token::Match(tok3, functionPattern) || Token::Match(tok3, breakPattern))
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varsAssigned.clear();
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}
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tok2 = endOfConditional;
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}
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else
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++ indentLevel;
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}
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else if (tok2->str() == "}")
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{
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-- indentLevel;
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// End of the switch block
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if (indentLevel < 0)
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break;
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}
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// Variable assignment. Report an error if it's assigned to twice before a break. E.g.:
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// case 3: b = 1; // <== redundant
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// case 4: b = 2;
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if (Token::Match(tok2->previous(), ";|{|}|: %var% = %any% ;") && tok2->varId() != 0)
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{
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std::map<unsigned int, const Token*>::iterator i = varsAssigned.find(tok2->varId());
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if (i == varsAssigned.end())
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varsAssigned[tok2->varId()] = tok2;
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else
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redundantAssignmentInSwitchError(i->second, i->second->str());
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}
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// Not a simple assignment so there may be good reason if this variable is assigned to twice. E.g.:
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// case 3: b = 1;
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// case 4: b++;
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else if (tok2->varId() != 0)
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varsAssigned.erase(tok2->varId());
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// Reset our record of assignments if there is a break or function call. E.g.:
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// case 3: b = 1; break;
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if (Token::Match(tok2, functionPattern) || Token::Match(tok2, breakPattern))
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varsAssigned.clear();
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}
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tok = Token::findmatch(tok->next(), switchPattern);
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}
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}
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//---------------------------------------------------------------------------
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// int x = 1;
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// x = x; // <- redundant assignment to self
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//
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// int y = y; // <- redundant initialization to self
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//---------------------------------------------------------------------------
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void CheckOther::checkSelfAssignment()
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{
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if (!_settings->_checkCodingStyle)
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return;
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const char selfAssignmentPattern[] = "%var% = %var% ;|=|)";
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const Token *tok = Token::findmatch(_tokenizer->tokens(), selfAssignmentPattern);
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while (tok)
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{
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if (tok->varId() && tok->varId() == tok->tokAt(2)->varId())
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{
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selfAssignmentError(tok, tok->str());
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}
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tok = Token::findmatch(tok->next(), selfAssignmentPattern);
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}
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}
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//---------------------------------------------------------------------------
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// int a = 1;
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// assert(a = 2); // <- assert should not have a side-effect
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//---------------------------------------------------------------------------
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void CheckOther::checkAssignmentInAssert()
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{
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if (!_settings->_checkCodingStyle)
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return;
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const char assertPattern[] = "assert ( %any%";
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const Token *tok = Token::findmatch(_tokenizer->tokens(), assertPattern);
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const Token *endTok = tok ? tok->next()->link() : NULL;
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while (tok && endTok)
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{
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const Token* varTok = Token::findmatch(tok->tokAt(2), "%var% --|++|+=|-=|*=|/=|&=|^=|=", endTok);
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if (varTok)
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{
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assignmentInAssertError(tok, varTok->str());
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}
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else if (NULL != (varTok = Token::findmatch(tok->tokAt(2), "--|++ %var%", endTok)))
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{
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assignmentInAssertError(tok, varTok->strAt(1));
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}
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tok = Token::findmatch(endTok->next(), assertPattern);
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endTok = tok ? tok->next()->link() : NULL;
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}
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}
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//---------------------------------------------------------------------------
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// if ((x != 1) || (x != 3)) // <- always true
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//---------------------------------------------------------------------------
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void CheckOther::checkIncorrectLogicOperator()
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{
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if (!_settings->_checkCodingStyle)
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return;
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const char conditionPattern[] = "if|while (";
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const Token *tok = Token::findmatch(_tokenizer->tokens(), conditionPattern);
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const Token *endTok = tok ? tok->next()->link() : NULL;
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while (tok && endTok)
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{
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// Find a pair of OR'd terms, with or without parenthesis
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// e.g. if (x != 3 || x != 4)
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const Token *logicTok = NULL, *term1Tok = NULL, *term2Tok = NULL;
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if (NULL != (logicTok = Token::findmatch(tok, "( %any% != %any% ) %oror% ( %any% != %any% ) !!&&", endTok)))
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{
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term1Tok = logicTok->next();
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term2Tok = logicTok->tokAt(7);
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}
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else if (NULL != (logicTok = Token::findmatch(tok, "%any% != %any% %oror% %any% != %any% !!&&", endTok)))
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{
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term1Tok = logicTok;
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term2Tok = logicTok->tokAt(4);
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}
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// The terms must not be AND'd with anything, to prevent false positives
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if (logicTok && (logicTok->strAt(-1) != "&&"))
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{
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// Find the common variable and the two different-valued constants
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unsigned int variableTested = 0;
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std::string firstConstant, secondConstant;
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if (Token::Match(term1Tok, "%var% != %num%"))
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{
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const unsigned int varId = term1Tok->varId();
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if (!varId)
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continue;
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firstConstant = term1Tok->tokAt(2)->str();
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if (Token::Match(term2Tok, "%varid% != %num%", varId))
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{
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variableTested = varId;
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secondConstant = term2Tok->tokAt(2)->str();
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}
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else if (Token::Match(term2Tok, "%num% != %varid%", varId))
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{
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variableTested = varId;
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secondConstant = term2Tok->str();
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}
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}
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else if (Token::Match(term1Tok, "%num% != %var%"))
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{
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const unsigned int varId = term1Tok->tokAt(2)->varId();
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firstConstant = term1Tok->str();
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if (Token::Match(term2Tok, "%varid% != %num%", varId))
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{
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variableTested = varId;
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secondConstant = term2Tok->tokAt(2)->str();
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}
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else if (Token::Match(term2Tok, "%num% != %varid%", varId))
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{
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variableTested = varId;
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secondConstant = term2Tok->str();
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}
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}
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// If there is a common variable tested for inequality against
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// either of two different-valued constants, then the expression
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// will always evaluate to true and the || probably should be an &&
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if (variableTested != 0 &&
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!firstConstant.empty() &&
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!secondConstant.empty() &&
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firstConstant != secondConstant)
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{
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incorrectLogicOperatorError(term1Tok);
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}
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}
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tok = Token::findmatch(endTok->next(), conditionPattern);
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endTok = tok ? tok->next()->link() : NULL;
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}
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}
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//---------------------------------------------------------------------------
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// try {} catch (std::exception err) {} <- Should be "std::exception& err"
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//---------------------------------------------------------------------------
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void CheckOther::checkCatchExceptionByValue()
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{
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if (!_settings->_checkCodingStyle)
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return;
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const char catchPattern[] = "} catch (";
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const Token *tok = Token::findmatch(_tokenizer->tokens(), catchPattern);
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const Token *endTok = tok ? tok->tokAt(2)->link() : NULL;
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while (tok && endTok)
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{
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// Find a pass-by-value declaration in the catch(), excluding basic types
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// e.g. catch (std::exception err)
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const Token *tokType = Token::findmatch(tok, "%type% %var% )", endTok);
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if (tokType && !tokType->isStandardType())
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{
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catchExceptionByValueError(tokType);
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}
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tok = Token::findmatch(endTok->next(), catchPattern);
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endTok = tok ? tok->tokAt(2)->link() : NULL;
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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 (!Token::Match(tok, "strtol|strtoul ("))
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continue;
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// Locate the third parameter of the function call..
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int param = 1;
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for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
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{
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if (tok2->str() == "(")
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tok2 = tok2->link();
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else if (tok2->str() == ")")
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break;
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else if (tok2->str() == ",")
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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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const MathLib::bigint 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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void CheckOther::invalidScanf()
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{
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if (!_settings->_checkCodingStyle)
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return;
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for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
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{
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const Token *formatToken = 0;
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if (Token::Match(tok, "scanf|vscanf ( %str% ,"))
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formatToken = tok->tokAt(2);
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else if (Token::Match(tok, "fscanf|vfscanf ( %var% , %str% ,"))
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formatToken = tok->tokAt(4);
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else
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continue;
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bool format = false;
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// scan the string backwards, so we dont need to keep states
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const std::string &formatstr(formatToken->str());
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for (unsigned int i = 1; i < formatstr.length(); i++)
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{
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if (formatstr[i] == '%')
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format = !format;
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else if (!format)
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continue;
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else if (std::isdigit(formatstr[i]))
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{
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format = false;
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}
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else if (std::isalpha(formatstr[i]))
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{
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invalidScanfError(tok);
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format = false;
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}
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}
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}
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}
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void CheckOther::invalidScanfError(const Token *tok)
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{
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reportError(tok, Severity::warning,
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"invalidscanf", "scanf without field width limits can crash with huge input data\n"
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"scanf without field width limits can crash with huge input data. To fix this error "
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"message add a field width specifier:\n"
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" %s => %20s\n"
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" %i => %3i\n"
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"\n"
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"Sample program that can crash:\n"
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"\n"
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"#include <stdio.h>\n"
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"int main()\n"
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"{\n"
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" int a;\n"
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" scanf(\"%i\", &a);\n"
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" return 0;\n"
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"}\n"
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"\n"
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"To make it crash:\n"
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"perl -e 'print \"5\"x2100000' | ./a.out");
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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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if (!_settings->_checkCodingStyle)
|
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return;
|
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|
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// Check for "ivar / uvar" and "uvar / ivar"
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std::map<unsigned int, 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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if (tok->tokAt(1)->isUnsigned())
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varsign[tok->tokAt(2)->varId()] = 'u';
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else
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varsign[tok->tokAt(2)->varId()] = 's';
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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] == '-')
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{
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char sign1 = varsign[tok->tokAt(1)->varId()];
|
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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] == '-')
|
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{
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char sign2 = varsign[tok->tokAt(3)->varId()];
|
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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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|
// memset(p, y, 0 /* bytes to fill */) <- 2nd and 3rd arguments inverted
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//---------------------------------------------------------------------------
|
|
void CheckOther::checkMemsetZeroBytes()
|
|
{
|
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const Token *tok = _tokenizer->tokens();
|
|
while (tok && ((tok = Token::findmatch(tok, "memset ( %var% , %num% , 0 )")) != NULL))
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|
{
|
|
memsetZeroBytesError(tok, tok->strAt(2));
|
|
tok = tok->tokAt(8);
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// 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, "[+-*/%&!~|^,[])?:]")));
|
|
}
|
|
|
|
/**
|
|
* @brief This class is used to capture the control flow within a function.
|
|
*/
|
|
class Scope
|
|
{
|
|
public:
|
|
Scope() : _token(NULL), _parent(NULL) { }
|
|
Scope(const Token *token, Scope *parent_) : _token(token), _parent(parent_) { }
|
|
~Scope();
|
|
|
|
Scope *parent()
|
|
{
|
|
return _parent;
|
|
}
|
|
Scope *addChild(const Token *token);
|
|
void remove(Scope *scope);
|
|
|
|
private:
|
|
const Token *_token;
|
|
Scope *_parent;
|
|
std::list<Scope *> _children;
|
|
};
|
|
|
|
Scope::~Scope()
|
|
{
|
|
while (!_children.empty())
|
|
{
|
|
delete *_children.begin();
|
|
_children.pop_front();
|
|
}
|
|
}
|
|
|
|
Scope *Scope::addChild(const Token *token)
|
|
{
|
|
Scope *temp = new Scope(token, this);
|
|
|
|
_children.push_back(temp);
|
|
|
|
return temp;
|
|
}
|
|
|
|
void Scope::remove(Scope *scope)
|
|
{
|
|
std::list<Scope *>::iterator it;
|
|
|
|
for (it = _children.begin(); it != _children.end(); ++it)
|
|
{
|
|
if (*it == scope)
|
|
{
|
|
delete *it;
|
|
_children.erase(it);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief This class is used create a list of variables within a function.
|
|
*/
|
|
class Variables
|
|
{
|
|
public:
|
|
enum VariableType { standard, array, pointer, reference, pointerArray, referenceArray, pointerPointer };
|
|
|
|
/** Store information about variable usage */
|
|
class VariableUsage
|
|
{
|
|
public:
|
|
VariableUsage(const Token *name = 0,
|
|
VariableType type = standard,
|
|
Scope *scope = NULL,
|
|
bool read = false,
|
|
bool write = false,
|
|
bool modified = false,
|
|
bool allocateMemory = false) :
|
|
_name(name),
|
|
_type(type),
|
|
_scope(scope),
|
|
_read(read),
|
|
_write(write),
|
|
_modified(modified),
|
|
_allocateMemory(allocateMemory)
|
|
{
|
|
}
|
|
|
|
/** variable is used.. set both read+write */
|
|
void use()
|
|
{
|
|
_read = true;
|
|
_write = true;
|
|
}
|
|
|
|
/** is variable unused? */
|
|
bool unused() const
|
|
{
|
|
return (_read == false && _write == false);
|
|
}
|
|
|
|
const Token *_name;
|
|
VariableType _type;
|
|
Scope *_scope;
|
|
bool _read;
|
|
bool _write;
|
|
bool _modified; // read/modify/write
|
|
bool _allocateMemory;
|
|
std::set<unsigned int> _aliases;
|
|
std::set<Scope *> _assignments;
|
|
};
|
|
|
|
typedef std::map<unsigned int, VariableUsage> VariableMap;
|
|
|
|
void clear()
|
|
{
|
|
_varUsage.clear();
|
|
}
|
|
VariableMap &varUsage()
|
|
{
|
|
return _varUsage;
|
|
}
|
|
void addVar(const Token *name, VariableType type, Scope *scope, bool write_);
|
|
void allocateMemory(unsigned int varid);
|
|
void read(unsigned int varid);
|
|
void readAliases(unsigned int varid);
|
|
void readAll(unsigned int varid);
|
|
void write(unsigned int varid);
|
|
void writeAliases(unsigned int varid);
|
|
void writeAll(unsigned int varid);
|
|
void use(unsigned int varid);
|
|
void modified(unsigned int varid);
|
|
VariableUsage *find(unsigned int varid);
|
|
void alias(unsigned int varid1, unsigned int varid2, bool replace);
|
|
void erase(unsigned int varid)
|
|
{
|
|
_varUsage.erase(varid);
|
|
}
|
|
void eraseAliases(unsigned int varid);
|
|
void eraseAll(unsigned int varid);
|
|
void clearAliases(unsigned int varid);
|
|
|
|
private:
|
|
VariableMap _varUsage;
|
|
};
|
|
|
|
/**
|
|
* Alias the 2 given variables. Either replace the existing aliases if
|
|
* they exist or merge them. You would replace an existing alias when this
|
|
* assignment is in the same scope as the previous assignment. You might
|
|
* merge the aliases when this assignment is in a different scope from the
|
|
* previous assignment depending on the relationship of the 2 scopes.
|
|
*/
|
|
void Variables::alias(unsigned int varid1, unsigned int varid2, bool replace)
|
|
{
|
|
VariableUsage *var1 = find(varid1);
|
|
VariableUsage *var2 = find(varid2);
|
|
|
|
// alias to self
|
|
if (varid1 == varid2)
|
|
{
|
|
if (var1)
|
|
var1->use();
|
|
return;
|
|
}
|
|
|
|
std::set<unsigned int>::iterator i;
|
|
|
|
if (replace)
|
|
{
|
|
// remove var1 from all aliases
|
|
for (i = var1->_aliases.begin(); i != var1->_aliases.end(); ++i)
|
|
{
|
|
VariableUsage *temp = find(*i);
|
|
|
|
if (temp)
|
|
temp->_aliases.erase(var1->_name->varId());
|
|
}
|
|
|
|
// remove all aliases from var1
|
|
var1->_aliases.clear();
|
|
}
|
|
|
|
// var1 gets all var2s aliases
|
|
for (i = var2->_aliases.begin(); i != var2->_aliases.end(); ++i)
|
|
{
|
|
if (*i != varid1)
|
|
var1->_aliases.insert(*i);
|
|
}
|
|
|
|
// var2 is an alias of var1
|
|
var2->_aliases.insert(varid1);
|
|
var1->_aliases.insert(varid2);
|
|
|
|
if (var2->_type == Variables::pointer)
|
|
var2->_read = true;
|
|
}
|
|
|
|
void Variables::clearAliases(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
// remove usage from all aliases
|
|
std::set<unsigned int>::iterator i;
|
|
|
|
for (i = usage->_aliases.begin(); i != usage->_aliases.end(); ++i)
|
|
{
|
|
VariableUsage *temp = find(*i);
|
|
|
|
if (temp)
|
|
temp->_aliases.erase(usage->_name->varId());
|
|
}
|
|
|
|
// remove all aliases from usage
|
|
usage->_aliases.clear();
|
|
}
|
|
}
|
|
|
|
void Variables::eraseAliases(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
erase(*aliases);
|
|
}
|
|
}
|
|
|
|
void Variables::eraseAll(unsigned int varid)
|
|
{
|
|
eraseAliases(varid);
|
|
erase(varid);
|
|
}
|
|
|
|
void Variables::addVar(const Token *name,
|
|
VariableType type,
|
|
Scope *scope,
|
|
bool write_)
|
|
{
|
|
if (name->varId() > 0)
|
|
_varUsage.insert(std::make_pair(name->varId(), VariableUsage(name, type, scope, false, write_, false)));
|
|
}
|
|
|
|
void Variables::allocateMemory(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
usage->_allocateMemory = true;
|
|
}
|
|
|
|
void Variables::read(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
usage->_read = true;
|
|
}
|
|
|
|
void Variables::readAliases(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->_read = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Variables::readAll(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
usage->_read = true;
|
|
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->_read = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Variables::write(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
usage->_write = true;
|
|
}
|
|
|
|
void Variables::writeAliases(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->_write = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Variables::writeAll(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
usage->_write = true;
|
|
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->_write = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Variables::use(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
usage->use();
|
|
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->use();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Variables::modified(unsigned int varid)
|
|
{
|
|
VariableUsage *usage = find(varid);
|
|
|
|
if (usage)
|
|
{
|
|
usage->_modified = true;
|
|
|
|
std::set<unsigned int>::iterator aliases;
|
|
|
|
for (aliases = usage->_aliases.begin(); aliases != usage->_aliases.end(); ++aliases)
|
|
{
|
|
VariableUsage *aliased = find(*aliases);
|
|
|
|
if (aliased)
|
|
aliased->_modified = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
Variables::VariableUsage *Variables::find(unsigned int varid)
|
|
{
|
|
if (varid)
|
|
{
|
|
VariableMap::iterator i = _varUsage.find(varid);
|
|
if (i != _varUsage.end())
|
|
return &i->second;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int doAssignment(Variables &variables, const Token *tok, bool dereference, Scope *scope)
|
|
{
|
|
int next = 0;
|
|
|
|
// a = a + b;
|
|
if (Token::Match(tok, "%var% = %var% !!;") && tok->str() == tok->strAt(2))
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
// check for aliased variable
|
|
const unsigned int varid1 = tok->varId();
|
|
Variables::VariableUsage *var1 = variables.find(varid1);
|
|
|
|
if (var1)
|
|
{
|
|
Variables::VariableUsage *var2 = 0;
|
|
int start = 1;
|
|
|
|
// search for '='
|
|
while (tok->tokAt(start)->str() != "=")
|
|
start++;
|
|
|
|
start++;
|
|
|
|
if (Token::Match(tok->tokAt(start), "&| %var%") ||
|
|
Token::Match(tok->tokAt(start), "( const| struct|union| %type% *| ) &| %var%") ||
|
|
Token::Match(tok->tokAt(start), "( const| struct|union| %type% *| ) ( &| %var%") ||
|
|
Token::Match(tok->tokAt(start), "%any% < const| struct|union| %type% *| > ( &| %var%"))
|
|
{
|
|
unsigned char offset = 0;
|
|
unsigned int varid2;
|
|
bool addressOf = false;
|
|
|
|
if (Token::Match(tok->tokAt(start), "%var% ."))
|
|
variables.use(tok->tokAt(start)->varId()); // use = read + write
|
|
|
|
// check for C style cast
|
|
if (tok->tokAt(start)->str() == "(")
|
|
{
|
|
if (tok->tokAt(start + 1)->str() == "const")
|
|
offset++;
|
|
|
|
if (Token::Match(tok->tokAt(start + 1 + offset), "struct|union"))
|
|
offset++;
|
|
|
|
if (tok->tokAt(start + 2 + offset)->str() == "*")
|
|
offset++;
|
|
|
|
if (tok->tokAt(start + 3 + offset)->str() == "&")
|
|
{
|
|
addressOf = true;
|
|
next = start + 4 + offset;
|
|
}
|
|
else if (tok->tokAt(start + 3 + offset)->str() == "(")
|
|
{
|
|
if (tok->tokAt(start + 4 + offset)->str() == "&")
|
|
{
|
|
addressOf = true;
|
|
next = start + 5 + offset;
|
|
}
|
|
else
|
|
next = start + 4 + offset;
|
|
}
|
|
else
|
|
next = start + 3 + offset;
|
|
}
|
|
|
|
// check for C++ style cast
|
|
else if (tok->tokAt(start)->str().find("cast") != std::string::npos &&
|
|
tok->tokAt(start + 1)->str() == "<")
|
|
{
|
|
if (tok->tokAt(start + 2)->str() == "const")
|
|
offset++;
|
|
|
|
if (Token::Match(tok->tokAt(start + 2 + offset), "struct|union"))
|
|
offset++;
|
|
|
|
if (tok->tokAt(start + 3 + offset)->str() == "*")
|
|
offset++;
|
|
|
|
if (tok->tokAt(start + 5 + offset)->str() == "&")
|
|
{
|
|
addressOf = true;
|
|
next = start + 6 + offset;
|
|
}
|
|
else
|
|
next = start + 5 + offset;
|
|
}
|
|
|
|
// check for var ? ...
|
|
else if (Token::Match(tok->tokAt(start), "%var% ?"))
|
|
{
|
|
next = start;
|
|
}
|
|
|
|
// no cast
|
|
else
|
|
{
|
|
if (tok->tokAt(start)->str() == "&")
|
|
{
|
|
addressOf = true;
|
|
next = start + 1;
|
|
}
|
|
else if (tok->tokAt(start)->str() == "new")
|
|
return 0;
|
|
else
|
|
next = start;
|
|
}
|
|
|
|
// check if variable is local
|
|
varid2 = tok->tokAt(next)->varId();
|
|
var2 = variables.find(varid2);
|
|
|
|
if (var2) // local variable (alias or read it)
|
|
{
|
|
if (var1->_type == Variables::pointer)
|
|
{
|
|
if (dereference)
|
|
variables.read(varid2);
|
|
else
|
|
{
|
|
if (addressOf ||
|
|
var2->_type == Variables::array ||
|
|
var2->_type == Variables::pointer)
|
|
{
|
|
bool replace = true;
|
|
|
|
// check if variable declared in same scope
|
|
if (scope == var1->_scope)
|
|
replace = true;
|
|
|
|
// not in same scope as declaration
|
|
else
|
|
{
|
|
std::set<Scope *>::iterator assignment;
|
|
|
|
// check for an assignment in this scope
|
|
assignment = var1->_assignments.find(scope);
|
|
|
|
// no other assignment in this scope
|
|
if (assignment == var1->_assignments.end())
|
|
{
|
|
// nothing to replace
|
|
if (var1->_assignments.empty())
|
|
replace = false;
|
|
|
|
// this variable has previous assignments
|
|
else
|
|
{
|
|
/**
|
|
* @todo determine if existing aliases should be replaced or merged
|
|
*/
|
|
|
|
replace = false;
|
|
}
|
|
}
|
|
|
|
// assignment in this scope
|
|
else
|
|
{
|
|
// replace when only one other assignment
|
|
if (var1->_assignments.size() == 1)
|
|
replace = true;
|
|
|
|
// otherwise, merge them
|
|
else
|
|
replace = false;
|
|
}
|
|
}
|
|
|
|
variables.alias(varid1, varid2, replace);
|
|
}
|
|
else if (tok->tokAt(next + 1)->str() == "?")
|
|
{
|
|
if (var2->_type == Variables::reference)
|
|
variables.readAliases(varid2);
|
|
else
|
|
variables.read(varid2);
|
|
}
|
|
}
|
|
}
|
|
else if (var1->_type == Variables::reference)
|
|
{
|
|
variables.alias(varid1, varid2, true);
|
|
}
|
|
else
|
|
{
|
|
if (var2->_type == Variables::pointer && tok->tokAt(next + 1)->str() == "[")
|
|
variables.readAliases(varid2);
|
|
|
|
variables.read(varid2);
|
|
}
|
|
}
|
|
else // not a local variable (or an unsupported local variable)
|
|
{
|
|
if (var1->_type == Variables::pointer && !dereference)
|
|
{
|
|
// check if variable declaration is in this scope
|
|
if (var1->_scope == scope)
|
|
variables.clearAliases(varid1);
|
|
else
|
|
{
|
|
std::set<Scope *>::iterator assignment;
|
|
|
|
// check for an assignment in this scope
|
|
assignment = var1->_assignments.find(scope);
|
|
|
|
// no other assignment in this scope
|
|
if (assignment == var1->_assignments.end())
|
|
{
|
|
/**
|
|
* @todo determine if existing aliases should be discarded
|
|
*/
|
|
}
|
|
|
|
// this assignment replaces the last assignment in this scope
|
|
else
|
|
{
|
|
// aliased variables in a larger scope are not supported
|
|
// remove all aliases
|
|
variables.clearAliases(varid1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var1->_assignments.insert(scope);
|
|
}
|
|
|
|
// check for alias to struct member
|
|
// char c[10]; a.b = c;
|
|
else if (Token::Match(tok->tokAt(-2), "%var% ."))
|
|
{
|
|
if (Token::Match(tok->tokAt(2), "%var%"))
|
|
{
|
|
unsigned int varid2 = tok->tokAt(2)->varId();
|
|
Variables::VariableUsage *var2 = variables.find(varid2);
|
|
|
|
// struct member aliased to local variable
|
|
if (var2 && (var2->_type == Variables::array ||
|
|
var2->_type == Variables::pointer))
|
|
{
|
|
// erase aliased variable and all variables that alias it
|
|
// to prevent false positives
|
|
variables.eraseAll(varid2);
|
|
}
|
|
}
|
|
}
|
|
|
|
return next;
|
|
}
|
|
|
|
static bool nextIsStandardType(const Token *tok)
|
|
{
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
tok = tok->next();
|
|
|
|
return tok->isStandardType();
|
|
}
|
|
|
|
static bool nextIsStandardTypeOrVoid(const Token *tok)
|
|
{
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
return tok->isStandardType() || tok->str() == "void";
|
|
}
|
|
|
|
void CheckOther::functionVariableUsage()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
// Parse all executing scopes..
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<SymbolDatabase::SpaceInfo *>::const_iterator i;
|
|
|
|
for (i = symbolDatabase->spaceInfoList.begin(); i != symbolDatabase->spaceInfoList.end(); ++i)
|
|
{
|
|
const SymbolDatabase::SpaceInfo *info = *i;
|
|
|
|
// only check functions
|
|
if (info->type != SymbolDatabase::SpaceInfo::Function)
|
|
continue;
|
|
|
|
// First token for the current scope..
|
|
const Token *const tok1 = info->classStart;
|
|
|
|
// varId, usage {read, write, modified}
|
|
Variables variables;
|
|
|
|
// scopes
|
|
Scope scopes;
|
|
Scope *scope = &scopes;
|
|
|
|
unsigned int indentlevel = 0;
|
|
for (const Token *tok = tok1; tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "{")
|
|
{
|
|
// replace the head node when found
|
|
if (indentlevel == 0)
|
|
scopes = Scope(tok, NULL);
|
|
// add the new scope
|
|
else
|
|
scope = scope->addChild(tok);
|
|
++indentlevel;
|
|
}
|
|
else if (tok->str() == "}")
|
|
{
|
|
--indentlevel;
|
|
|
|
scope = scope->parent();
|
|
|
|
if (indentlevel == 0)
|
|
break;
|
|
}
|
|
else if (Token::Match(tok, "struct|union|class {") ||
|
|
Token::Match(tok, "struct|union|class %type% {|:"))
|
|
{
|
|
while (tok->str() != "{")
|
|
tok = tok->next();
|
|
tok = tok->link();
|
|
if (! tok)
|
|
break;
|
|
}
|
|
|
|
if (Token::Match(tok, "[;{}] asm ( ) ;"))
|
|
{
|
|
variables.clear();
|
|
break;
|
|
}
|
|
|
|
// standard type declaration with possible initialization
|
|
// int i; int j = 0; static int k;
|
|
if (Token::Match(tok, "[;{}] static| %type% %var% ;|=") &&
|
|
nextIsStandardType(tok))
|
|
{
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
tok = tok->next();
|
|
|
|
variables.addVar(tok->next(), Variables::standard, scope,
|
|
tok->tokAt(2)->str() == "=" ||
|
|
tok->previous()->str() == "static");
|
|
tok = tok->next();
|
|
}
|
|
|
|
// standard type declaration and initialization using constructor
|
|
// int i(0); static int j(0);
|
|
else if (Token::Match(tok, "[;{}] static| %type% %var% ( %any% ) ;") &&
|
|
nextIsStandardType(tok))
|
|
{
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
tok = tok->next();
|
|
|
|
variables.addVar(tok->next(), Variables::standard, scope, true);
|
|
|
|
// check if a local variable is used to initialize this variable
|
|
if (tok->tokAt(3)->varId() > 0)
|
|
variables.readAll(tok->tokAt(3)->varId());
|
|
tok = tok->tokAt(4);
|
|
}
|
|
|
|
// standard type declaration of array of with possible initialization
|
|
// int i[10]; int j[2] = { 0, 1 }; static int k[2] = { 2, 3 };
|
|
else if (Token::Match(tok, "[;{}] static| const| %type% *| %var% [ %any% ] ;|=") &&
|
|
nextIsStandardType(tok))
|
|
{
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->str() != "return" && tok->str() != "throw")
|
|
{
|
|
bool isPointer = bool(tok->strAt(1) == "*");
|
|
const Token * const nametok = tok->tokAt(isPointer ? 2 : 1);
|
|
|
|
variables.addVar(nametok, isPointer ? Variables::pointerArray : Variables::array, scope,
|
|
nametok->tokAt(4)->str() == "=" || isStatic);
|
|
|
|
// check for reading array size from local variable
|
|
if (nametok->tokAt(2)->varId() != 0)
|
|
variables.read(nametok->tokAt(2)->varId());
|
|
|
|
// look at initializers
|
|
if (Token::Match(nametok->tokAt(4), "= {"))
|
|
{
|
|
tok = nametok->tokAt(6);
|
|
while (tok->str() != "}")
|
|
{
|
|
if (Token::Match(tok, "%var%"))
|
|
variables.read(tok->varId());
|
|
tok = tok->next();
|
|
}
|
|
}
|
|
else
|
|
tok = nametok->tokAt(3);
|
|
}
|
|
}
|
|
|
|
// pointer or reference declaration with possible initialization
|
|
// int * i; int * j = 0; static int * k = 0;
|
|
else if (Token::Match(tok, "[;{}] static| const| %type% *|& %var% ;|="))
|
|
{
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->strAt(1) == "::")
|
|
tok = tok->tokAt(2);
|
|
|
|
if (tok->str() != "return" && tok->str() != "throw")
|
|
{
|
|
Variables::VariableType type;
|
|
|
|
if (tok->next()->str() == "*")
|
|
type = Variables::pointer;
|
|
else
|
|
type = Variables::reference;
|
|
|
|
bool written = tok->tokAt(3)->str() == "=";
|
|
|
|
variables.addVar(tok->tokAt(2), type, scope, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(2), false, scope);
|
|
|
|
tok = tok->tokAt(2 + offset);
|
|
}
|
|
}
|
|
|
|
// pointer to pointer declaration with possible initialization
|
|
// int ** i; int ** j = 0; static int ** k = 0;
|
|
else if (Token::Match(tok, "[;{}] static| const| %type% * * %var% ;|="))
|
|
{
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->str() != "return")
|
|
{
|
|
bool written = tok->tokAt(4)->str() == "=";
|
|
|
|
variables.addVar(tok->tokAt(3), Variables::pointerPointer, scope, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(3), false, scope);
|
|
|
|
tok = tok->tokAt(3 + offset);
|
|
}
|
|
}
|
|
|
|
// pointer or reference of struct or union declaration with possible initialization
|
|
// struct s * i; struct s * j = 0; static struct s * k = 0;
|
|
else if (Token::Match(tok, "[;{}] static| const| struct|union %type% *|& %var% ;|="))
|
|
{
|
|
Variables::VariableType type;
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->strAt(2) == "*")
|
|
type = Variables::pointer;
|
|
else
|
|
type = Variables::reference;
|
|
|
|
const bool written = tok->strAt(4) == "=";
|
|
|
|
variables.addVar(tok->tokAt(3), type, scope, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(3), false, scope);
|
|
|
|
tok = tok->tokAt(3 + offset);
|
|
}
|
|
|
|
// pointer or reference declaration with initialization using constructor
|
|
// int * i(j); int * k(i); static int * l(i);
|
|
else if (Token::Match(tok, "[;{}] static| const| %type% &|* %var% ( %any% ) ;") &&
|
|
nextIsStandardTypeOrVoid(tok))
|
|
{
|
|
Variables::VariableType type;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->next()->str() == "*")
|
|
type = Variables::pointer;
|
|
else
|
|
type = Variables::reference;
|
|
|
|
unsigned int varid = 0;
|
|
|
|
// check for aliased variable
|
|
if (Token::Match(tok->tokAt(4), "%var%"))
|
|
varid = tok->tokAt(4)->varId();
|
|
|
|
variables.addVar(tok->tokAt(2), type, scope, true);
|
|
|
|
// check if a local variable is used to initialize this variable
|
|
if (varid > 0)
|
|
{
|
|
Variables::VariableUsage *var = variables.find(varid);
|
|
|
|
if (type == Variables::pointer)
|
|
{
|
|
variables.use(tok->tokAt(4)->varId());
|
|
|
|
if (var && (var->_type == Variables::array ||
|
|
var->_type == Variables::pointer))
|
|
var->_aliases.insert(tok->varId());
|
|
}
|
|
else
|
|
{
|
|
variables.readAll(tok->tokAt(4)->varId());
|
|
if (var)
|
|
var->_aliases.insert(tok->varId());
|
|
}
|
|
}
|
|
tok = tok->tokAt(5);
|
|
}
|
|
|
|
// array of pointer or reference declaration with possible initialization
|
|
// int * p[10]; int * q[10] = { 0 }; static int * * r[10] = { 0 };
|
|
else if (Token::Match(tok, "[;{}] static| const| %type% *|& %var% [ %any% ] ;|="))
|
|
{
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
if (tok->str() != "return")
|
|
{
|
|
variables.addVar(tok->tokAt(2),
|
|
tok->next()->str() == "*" ? Variables::pointerArray : Variables::referenceArray, scope,
|
|
tok->tokAt(6)->str() == "=" || isStatic);
|
|
|
|
// check for reading array size from local variable
|
|
if (tok->tokAt(4)->varId() != 0)
|
|
variables.read(tok->tokAt(4)->varId());
|
|
|
|
tok = tok->tokAt(5);
|
|
}
|
|
}
|
|
|
|
// array of pointer or reference of struct or union declaration with possible initialization
|
|
// struct S * p[10]; struct T * q[10] = { 0 }; static struct S * r[10] = { 0 };
|
|
else if (Token::Match(tok, "[;{}] static| const| struct|union %type% *|& %var% [ %any% ] ;|="))
|
|
{
|
|
bool isStatic = false;
|
|
|
|
tok = tok->next();
|
|
|
|
if (tok->str() == "static")
|
|
{
|
|
tok = tok->next();
|
|
isStatic = true;
|
|
}
|
|
|
|
if (tok->str() == "const")
|
|
tok = tok->next();
|
|
|
|
variables.addVar(tok->tokAt(3),
|
|
tok->tokAt(2)->str() == "*" ? Variables::pointerArray : Variables::referenceArray, scope,
|
|
tok->tokAt(7)->str() == "=" || isStatic);
|
|
|
|
// check for reading array size from local variable
|
|
if (tok->tokAt(5)->varId() != 0)
|
|
variables.read(tok->tokAt(5)->varId());
|
|
|
|
tok = tok->tokAt(6);
|
|
}
|
|
|
|
// Freeing memory (not considered "using" the pointer if it was also allocated in this function)
|
|
else if (Token::Match(tok, "free|g_free|kfree|vfree ( %var% )") ||
|
|
Token::Match(tok, "delete %var% ;") ||
|
|
Token::Match(tok, "delete [ ] %var% ;"))
|
|
{
|
|
unsigned int varid = 0;
|
|
if (tok->str() != "delete")
|
|
{
|
|
varid = tok->tokAt(2)->varId();
|
|
tok = tok->tokAt(3);
|
|
}
|
|
else if (tok->strAt(1) == "[")
|
|
{
|
|
varid = tok->tokAt(3)->varId();
|
|
tok = tok->tokAt(4);
|
|
}
|
|
else
|
|
{
|
|
varid = tok->next()->varId();
|
|
tok = tok->tokAt(2);
|
|
}
|
|
|
|
Variables::VariableUsage *var = variables.find(varid);
|
|
if (var && !var->_allocateMemory)
|
|
{
|
|
variables.readAll(varid);
|
|
}
|
|
}
|
|
|
|
else if (Token::Match(tok, "return|throw %var%"))
|
|
variables.readAll(tok->next()->varId());
|
|
|
|
// assignment
|
|
else if (Token::Match(tok, "*| (| ++|--| %var% ++|--| )| =") ||
|
|
Token::Match(tok, "*| ( const| %type% *| ) %var% ="))
|
|
{
|
|
bool dereference = false;
|
|
bool pre = false;
|
|
bool post = false;
|
|
|
|
if (tok->str() == "*")
|
|
{
|
|
dereference = true;
|
|
tok = tok->next();
|
|
}
|
|
|
|
if (Token::Match(tok, "( const| %type% *| ) %var% ="))
|
|
tok = tok->link()->next();
|
|
|
|
else if (tok->str() == "(")
|
|
tok = tok->next();
|
|
|
|
if (Token::Match(tok, "++|--"))
|
|
{
|
|
pre = true;
|
|
tok = tok->next();
|
|
}
|
|
|
|
if (Token::Match(tok->next(), "++|--"))
|
|
post = true;
|
|
|
|
const unsigned int varid1 = tok->varId();
|
|
const Token *start = tok;
|
|
|
|
tok = tok->tokAt(doAssignment(variables, tok, dereference, scope));
|
|
|
|
if (pre || post)
|
|
variables.use(varid1);
|
|
|
|
if (dereference)
|
|
{
|
|
variables.writeAliases(varid1);
|
|
variables.read(varid1);
|
|
}
|
|
else
|
|
{
|
|
Variables::VariableUsage *var = variables.find(varid1);
|
|
if (var && var->_type == Variables::reference)
|
|
{
|
|
variables.writeAliases(varid1);
|
|
variables.read(varid1);
|
|
}
|
|
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
|
|
else if (var && var->_type == Variables::pointer &&
|
|
Token::Match(start, "%var% = new|malloc|calloc|g_malloc|kmalloc|vmalloc"))
|
|
{
|
|
bool allocate = true;
|
|
|
|
if (start->strAt(2) == "new")
|
|
{
|
|
// is it a user defined type?
|
|
if (!start->tokAt(3)->isStandardType())
|
|
{
|
|
// lookup the type
|
|
const SymbolDatabase::SpaceInfo *type = symbolDatabase->findVarType(info, start->tokAt(3));
|
|
|
|
// unknown type?
|
|
if (!type)
|
|
allocate = false;
|
|
|
|
// has default constructor or
|
|
// has members with unknown type or default constructor
|
|
else if (type->needInitialization == SymbolDatabase::SpaceInfo::False)
|
|
allocate = false;
|
|
}
|
|
}
|
|
|
|
if (allocate)
|
|
variables.allocateMemory(varid1);
|
|
else
|
|
variables.write(varid1);
|
|
}
|
|
else if (varid1 && Token::Match(tok, "%varid% .", varid1))
|
|
{
|
|
variables.use(varid1);
|
|
}
|
|
else
|
|
{
|
|
variables.write(varid1);
|
|
}
|
|
|
|
Variables::VariableUsage *var2 = variables.find(tok->varId());
|
|
if (var2)
|
|
{
|
|
if (var2->_type == Variables::reference)
|
|
{
|
|
variables.writeAliases(tok->varId());
|
|
variables.read(tok->varId());
|
|
}
|
|
else if (tok->varId() != varid1 && Token::Match(tok, "%var% ."))
|
|
variables.use(tok->varId());
|
|
else if (tok->varId() != varid1 &&
|
|
var2->_type == Variables::standard &&
|
|
tok->strAt(-1) != "&")
|
|
variables.use(tok->varId());
|
|
}
|
|
}
|
|
|
|
const Token *equal = tok->next();
|
|
|
|
if (Token::Match(tok->next(), "[ %any% ]"))
|
|
equal = tok->tokAt(4);
|
|
|
|
// checked for chained assignments
|
|
if (tok != start && equal->str() == "=")
|
|
{
|
|
Variables::VariableUsage *var = variables.find(tok->varId());
|
|
|
|
if (var && var->_type != Variables::reference)
|
|
var->_read = true;
|
|
|
|
tok = tok->previous();
|
|
}
|
|
}
|
|
|
|
// assignment
|
|
else if (Token::Match(tok, "%var% [") && Token::Match(tok->next()->link(), "] ="))
|
|
{
|
|
unsigned int varid = tok->varId();
|
|
const Variables::VariableUsage *var = variables.find(varid);
|
|
|
|
if (var)
|
|
{
|
|
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
|
|
if (var->_type == Variables::pointer &&
|
|
Token::Match(tok->next()->link(), "] = new|malloc|calloc|g_malloc|kmalloc|vmalloc"))
|
|
{
|
|
variables.allocateMemory(varid);
|
|
}
|
|
else if (var->_type == Variables::pointer || var->_type == Variables::reference)
|
|
{
|
|
variables.read(varid);
|
|
variables.writeAliases(varid);
|
|
}
|
|
else
|
|
variables.writeAll(varid);
|
|
}
|
|
}
|
|
|
|
else if (Token::Match(tok, ">>|& %var%"))
|
|
variables.use(tok->next()->varId()); // use = read + write
|
|
else if (Token::Match(tok, "[;{}] %var% >>"))
|
|
variables.use(tok->next()->varId()); // use = read + write
|
|
|
|
// function parameter
|
|
else if (Token::Match(tok, "[(,] %var% ["))
|
|
variables.use(tok->next()->varId()); // use = read + write
|
|
else if (Token::Match(tok, "[(,] %var% [,)]") && tok->previous()->str() != "*")
|
|
variables.use(tok->next()->varId()); // use = read + write
|
|
else if (Token::Match(tok, "[(,] (") &&
|
|
Token::Match(tok->next()->link(), ") %var% [,)]"))
|
|
variables.use(tok->next()->link()->next()->varId()); // use = read + write
|
|
|
|
// function
|
|
else if (Token::Match(tok, " %var% ("))
|
|
{
|
|
variables.read(tok->varId());
|
|
if (Token::Match(tok->tokAt(2), "%var% ="))
|
|
variables.read(tok->tokAt(2)->varId());
|
|
}
|
|
|
|
else if (Token::Match(tok, " %var% ."))
|
|
variables.use(tok->varId()); // use = read + write
|
|
|
|
else if ((Token::Match(tok, "[(=&!]") || isOp(tok)) &&
|
|
(Token::Match(tok->next(), "%var%") && !Token::Match(tok->next(), "true|false|new")))
|
|
variables.readAll(tok->next()->varId());
|
|
|
|
else if (Token::Match(tok, "%var%") && (tok->next()->str() == ")" || isOp(tok->next())))
|
|
variables.readAll(tok->varId());
|
|
|
|
else if (Token::Match(tok, "; %var% ;"))
|
|
variables.readAll(tok->next()->varId());
|
|
|
|
if (Token::Match(tok, "++|-- %var%"))
|
|
{
|
|
if (tok->strAt(-1) != ";")
|
|
variables.use(tok->next()->varId());
|
|
else
|
|
variables.modified(tok->next()->varId());
|
|
}
|
|
|
|
else if (Token::Match(tok, "%var% ++|--"))
|
|
{
|
|
if (tok->strAt(-1) != ";")
|
|
variables.use(tok->varId());
|
|
else
|
|
variables.modified(tok->varId());
|
|
}
|
|
}
|
|
|
|
// Check usage of all variables in the current scope..
|
|
Variables::VariableMap::const_iterator it;
|
|
for (it = variables.varUsage().begin(); it != variables.varUsage().end(); ++it)
|
|
{
|
|
const Variables::VariableUsage &usage = it->second;
|
|
const std::string &varname = usage._name->str();
|
|
|
|
// variable has been marked as unused so ignore it
|
|
if (usage._name->isUnused())
|
|
continue;
|
|
|
|
// skip things that are only partially implemented to prevent false positives
|
|
if (usage._type == Variables::pointerPointer ||
|
|
usage._type == Variables::pointerArray ||
|
|
usage._type == Variables::referenceArray)
|
|
continue;
|
|
|
|
// variable has had memory allocated for it, but hasn't done
|
|
// anything with that memory other than, perhaps, freeing it
|
|
if (usage.unused() && !usage._modified && usage._allocateMemory)
|
|
allocatedButUnusedVariableError(usage._name, varname);
|
|
|
|
// variable has not been written, read, or modified
|
|
else if (usage.unused() && !usage._modified)
|
|
unusedVariableError(usage._name, varname);
|
|
|
|
// variable has not been written but has been modified
|
|
else if (usage._modified & !usage._write)
|
|
unassignedVariableError(usage._name, varname);
|
|
|
|
// variable has been written but not read
|
|
else if (!usage._read && !usage._modified)
|
|
unreadVariableError(usage._name, varname);
|
|
|
|
// variable has been read but not written
|
|
else if (!usage._write && !usage._allocateMemory)
|
|
unassignedVariableError(usage._name, varname);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::unusedVariableError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::style, "unusedVariable", "Unused variable: " + varname);
|
|
}
|
|
|
|
void CheckOther::allocatedButUnusedVariableError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::style, "unusedAllocatedMemory", "Variable '" + varname + "' is allocated memory that is never used");
|
|
}
|
|
|
|
void CheckOther::unreadVariableError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::style, "unreadVariable", "Variable '" + varname + "' is assigned a value that is never used");
|
|
}
|
|
|
|
void CheckOther::unassignedVariableError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::style, "unassignedVariable", "Variable '" + varname + "' is not assigned a value");
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check scope of variables..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkVariableScope()
|
|
{
|
|
if (!_settings->isEnabled("information"))
|
|
return;
|
|
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<SymbolDatabase::SpaceInfo *>::const_iterator i;
|
|
|
|
for (i = symbolDatabase->spaceInfoList.begin(); i != symbolDatabase->spaceInfoList.end(); ++i)
|
|
{
|
|
const SymbolDatabase::SpaceInfo *info = *i;
|
|
|
|
// only check functions
|
|
if (info->type != SymbolDatabase::SpaceInfo::Function)
|
|
continue;
|
|
|
|
// Walk through all tokens..
|
|
int indentlevel = 0;
|
|
for (const Token *tok = info->classStart; tok; tok = tok->next())
|
|
{
|
|
// Skip function local class and struct declarations..
|
|
if ((tok->str() == "class") || (tok->str() == "struct") || (tok->str() == "union"))
|
|
{
|
|
for (const Token *tok2 = tok; tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "{")
|
|
{
|
|
tok = tok2->link();
|
|
break;
|
|
}
|
|
if (Token::Match(tok2, "[,);]"))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
if (! tok)
|
|
break;
|
|
}
|
|
|
|
else if (tok->str() == "{")
|
|
{
|
|
++indentlevel;
|
|
}
|
|
else if (tok->str() == "}")
|
|
{
|
|
--indentlevel;
|
|
if (indentlevel == 0)
|
|
break;;
|
|
}
|
|
|
|
if (indentlevel > 0 && Token::Match(tok, "[{};]"))
|
|
{
|
|
// First token of statement..
|
|
const Token *tok1 = tok->next();
|
|
if (! tok1)
|
|
continue;
|
|
|
|
if ((tok1->str() == "return") ||
|
|
(tok1->str() == "throw") ||
|
|
(tok1->str() == "delete") ||
|
|
(tok1->str() == "goto") ||
|
|
(tok1->str() == "else"))
|
|
continue;
|
|
|
|
// Variable declaration?
|
|
if (Token::Match(tok1, "%type% %var% ; %var% = %num% ;"))
|
|
{
|
|
// Tokenizer modify "int i = 0;" to "int i; i = 0;",
|
|
// so to handle this situation we just skip
|
|
// initialization (see ticket #272).
|
|
const unsigned int firstVarId = tok1->next()->varId();
|
|
const unsigned int secondVarId = tok1->tokAt(3)->varId();
|
|
if (firstVarId > 0 && firstVarId == secondVarId)
|
|
{
|
|
lookupVar(tok1->tokAt(6), tok1->strAt(1));
|
|
}
|
|
}
|
|
else if (tok1->isStandardType() && Token::Match(tok1, "%type% %var% [;=]"))
|
|
{
|
|
lookupVar(tok1, tok1->strAt(1));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::lookupVar(const Token *tok1, const std::string &varname)
|
|
{
|
|
const Token *tok = tok1;
|
|
|
|
// Skip the variable declaration..
|
|
while (tok && tok->str() != ";")
|
|
tok = tok->next();
|
|
|
|
// Check if the variable is used in this indentlevel..
|
|
bool used1 = false; // used in one sub-scope -> reducable
|
|
bool used2 = false; // used in more sub-scopes -> not reducable
|
|
int indentlevel = 0;
|
|
int parlevel = 0;
|
|
bool for_or_while = false; // is sub-scope a "for/while/etc". anything that is not "if"
|
|
while (tok)
|
|
{
|
|
if (tok->str() == "{")
|
|
{
|
|
++indentlevel;
|
|
}
|
|
|
|
else if (tok->str() == "}")
|
|
{
|
|
if (indentlevel == 0)
|
|
break;
|
|
--indentlevel;
|
|
if (indentlevel == 0)
|
|
{
|
|
if (for_or_while && used2)
|
|
return;
|
|
used2 |= used1;
|
|
used1 = false;
|
|
}
|
|
}
|
|
|
|
else if (tok->str() == "(")
|
|
{
|
|
++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)
|
|
return;
|
|
used1 = true;
|
|
if (for_or_while && !Token::simpleMatch(tok->next(), "="))
|
|
used2 = true;
|
|
if (used1 && used2)
|
|
return;
|
|
}
|
|
|
|
else if (indentlevel == 0)
|
|
{
|
|
// %unknown% ( %any% ) {
|
|
// If %unknown% is anything except if, we assume
|
|
// that it is a for or while loop or a macro hiding either one
|
|
if (Token::simpleMatch(tok->next(), "(") &&
|
|
Token::simpleMatch(tok->next()->link(), ") {"))
|
|
{
|
|
if (tok->str() != "if")
|
|
for_or_while = true;
|
|
}
|
|
|
|
if (Token::simpleMatch(tok, "do {"))
|
|
for_or_while = true;
|
|
|
|
// possible unexpanded macro hiding for/while..
|
|
if (Token::Match(tok->previous(), "[;{}] %type% {"))
|
|
{
|
|
bool upper = true;
|
|
for (unsigned int i = 0; i < tok->str().length(); ++i)
|
|
{
|
|
if (!std::isupper(tok->str()[i]))
|
|
upper = false;
|
|
}
|
|
for_or_while |= upper;
|
|
}
|
|
|
|
if (parlevel == 0 && (tok->str() == ";"))
|
|
for_or_while = false;
|
|
}
|
|
|
|
tok = tok->next();
|
|
}
|
|
|
|
// Warning if this variable:
|
|
// * not used in this indentlevel
|
|
// * used in lower indentlevel
|
|
if (used1 || used2)
|
|
variableScopeError(tok1, varname);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check for constant function parameters
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkConstantFunctionParameter()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const SymbolDatabase * const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
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 std :: %type% < %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(8));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const std :: %type% < std :: %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(10));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const std :: %type% < std :: %type% , std :: %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(14));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const std :: %type% < %type% , std :: %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(12));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const std :: %type% < std :: %type% , %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(12));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const std :: %type% < %type% , %type% > %var% [,)]"))
|
|
{
|
|
passedByValueError(tok, tok->strAt(10));
|
|
}
|
|
|
|
else if (Token::Match(tok, "[,(] const %type% %var% [,)]"))
|
|
{
|
|
// Check if type is a struct or class.
|
|
if (symbolDatabase->isClassOrStruct(tok->strAt(2)))
|
|
{
|
|
passedByValueError(tok, tok->strAt(3));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check that all struct members are used
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkStructMemberUsage()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
std::string structname;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->fileIndex() != 0)
|
|
continue;
|
|
|
|
if (Token::Match(tok, "struct|union %type% {"))
|
|
{
|
|
structname.clear();
|
|
if (Token::simpleMatch(tok->previous(), "extern"))
|
|
continue;
|
|
if ((!tok->previous() || Token::simpleMatch(tok->previous(), ";")) && Token::Match(tok->tokAt(2)->link(), ("} ; " + tok->strAt(1) + " %var% ;").c_str()))
|
|
continue;
|
|
|
|
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.clear();
|
|
break;
|
|
}
|
|
|
|
if (tok2->str() == "}")
|
|
break;
|
|
}
|
|
|
|
// bail out if struct is inherited
|
|
if (!structname.empty() && Token::findmatch(tok, (",|private|protected|public " + structname).c_str()))
|
|
structname.clear();
|
|
|
|
// Bail out if some data is casted to struct..
|
|
const std::string s("( struct| " + tok->next()->str() + " * ) & %var% [");
|
|
if (Token::findmatch(tok, s.c_str()))
|
|
structname.clear();
|
|
|
|
// Try to prevent false positives when struct members are not used directly.
|
|
if (Token::findmatch(tok, (structname + " *").c_str()))
|
|
structname.clear();
|
|
else if (Token::findmatch(tok, (structname + " %type% *").c_str()))
|
|
structname = "";
|
|
}
|
|
|
|
if (tok->str() == "}")
|
|
structname.clear();
|
|
|
|
if (!structname.empty() && Token::Match(tok, "[{;]"))
|
|
{
|
|
// Declaring struct variable..
|
|
std::string varname;
|
|
|
|
// declaring a POD variable?
|
|
if (!tok->next()->isStandardType())
|
|
continue;
|
|
|
|
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;
|
|
|
|
// Check if the struct variable is used anywhere in the file
|
|
const std::string usagePattern(". " + 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()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Declaring the variable..
|
|
if (Token::Match(tok, "[{};(,] char %var% [;=,)]"))
|
|
{
|
|
// Check for unsigned char
|
|
if (tok->tokAt(1)->isUnsigned())
|
|
continue;
|
|
|
|
// 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;
|
|
}
|
|
|
|
if (Token::Match(tok2, "[;{}] %var% = %any% [&|] %any% ;"))
|
|
{
|
|
// is the char variable used in the calculation?
|
|
if (tok2->tokAt(3)->varId() != tok->varId() && tok2->tokAt(5)->varId() != tok->varId())
|
|
continue;
|
|
|
|
// it's ok with a bitwise and where the other operand is 0xff or less..
|
|
if (std::string(tok2->strAt(4)) == "&")
|
|
{
|
|
if (tok2->tokAt(3)->isNumber() && MathLib::isGreater("0x100", tok2->strAt(3)))
|
|
continue;
|
|
if (tok2->tokAt(5)->isNumber() && MathLib::isGreater("0x100", tok2->strAt(5)))
|
|
continue;
|
|
}
|
|
|
|
// is the result stored in a short|int|long?
|
|
if (!Token::findmatch(_tokenizer->tokens(), "short|int|long %varid%", tok2->next()->varId()))
|
|
continue;
|
|
|
|
// This is an error..
|
|
charBitOpError(tok2);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Incomplete statement..
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkIncompleteStatement()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "(")
|
|
tok = tok->link();
|
|
|
|
else if (Token::simpleMatch(tok, "= {"))
|
|
tok = tok->next()->link();
|
|
|
|
else if (Token::Match(tok, "[;{}] %str%") || Token::Match(tok, "[;{}] %num%"))
|
|
{
|
|
// bailout if there is a "? :" in this statement
|
|
bool bailout = false;
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "?")
|
|
bailout = true;
|
|
else if (tok2->str() == ";")
|
|
break;
|
|
}
|
|
if (bailout)
|
|
continue;
|
|
|
|
constStatementError(tok->next(), tok->next()->isNumber() ? "numeric" : "string");
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// str plus char
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::strPlusChar()
|
|
{
|
|
// Don't use this check for Java and C# programs..
|
|
if (_tokenizer->isJavaOrCSharp())
|
|
{
|
|
return;
|
|
}
|
|
|
|
bool charVars[10000] = {0};
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Declaring char variable..
|
|
if (Token::Match(tok, "char|int|short %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 std::string s = tok->strAt(3);
|
|
if (s[0] == '\'')
|
|
strPlusChar(tok->next());
|
|
|
|
// char variable..
|
|
unsigned int varid = tok->tokAt(3)->varId();
|
|
if (varid > 0 && varid < 10000 && charVars[varid])
|
|
strPlusChar(tok->next());
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::checkZeroDivision()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
|
|
if (Token::Match(tok, "/ %num%") &&
|
|
MathLib::isInt(tok->next()->str()) &&
|
|
MathLib::toLongNumber(tok->next()->str()) == 0L)
|
|
{
|
|
zerodivError(tok);
|
|
}
|
|
else if (Token::Match(tok, "div|ldiv|lldiv|imaxdiv ( %num% , %num% )") &&
|
|
MathLib::isInt(tok->tokAt(4)->str()) &&
|
|
MathLib::toLongNumber(tok->tokAt(4)->str()) == 0L)
|
|
{
|
|
zerodivError(tok);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void CheckOther::checkMathFunctions()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// case log(-2)
|
|
if (tok->varId() == 0 &&
|
|
Token::Match(tok, "log|log10 ( %num% )") &&
|
|
MathLib::isNegative(tok->tokAt(2)->str()) &&
|
|
MathLib::isInt(tok->tokAt(2)->str()) &&
|
|
MathLib::toLongNumber(tok->tokAt(2)->str()) <= 0)
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
// case log(-2.0)
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "log|log10 ( %num% )") &&
|
|
MathLib::isNegative(tok->tokAt(2)->str()) &&
|
|
MathLib::isFloat(tok->tokAt(2)->str()) &&
|
|
MathLib::toDoubleNumber(tok->tokAt(2)->str()) <= 0.)
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
|
|
// case log(0.0)
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "log|log10 ( %num% )") &&
|
|
!MathLib::isNegative(tok->tokAt(2)->str()) &&
|
|
MathLib::isFloat(tok->tokAt(2)->str()) &&
|
|
MathLib::toDoubleNumber(tok->tokAt(2)->str()) <= 0.)
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
|
|
// case log(0)
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "log|log10 ( %num% )") &&
|
|
!MathLib::isNegative(tok->tokAt(2)->str()) &&
|
|
MathLib::isInt(tok->tokAt(2)->str()) &&
|
|
MathLib::toLongNumber(tok->tokAt(2)->str()) <= 0)
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
// acos( x ), asin( x ) where x is defined for intervall [-1,+1], but not beyound
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "acos|asin ( %num% )") &&
|
|
std::fabs(MathLib::toDoubleNumber(tok->tokAt(2)->str())) > 1.0)
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
// sqrt( x ): if x is negative the result is undefined
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "sqrt ( %num% )") &&
|
|
MathLib::isNegative(tok->tokAt(2)->str()))
|
|
{
|
|
mathfunctionCallError(tok);
|
|
}
|
|
// atan2 ( x , y): x and y can not be zero, because this is mathematically not defined
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "atan2 ( %num% , %num% )") &&
|
|
MathLib::isNullValue(tok->tokAt(2)->str()) &&
|
|
MathLib::isNullValue(tok->tokAt(4)->str()))
|
|
{
|
|
mathfunctionCallError(tok, 2);
|
|
}
|
|
// fmod ( x , y) If y is zero, then either a range error will occur or the function will return zero (implementation-defined).
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "fmod ( %num% , %num% )") &&
|
|
MathLib::isNullValue(tok->tokAt(4)->str()))
|
|
{
|
|
mathfunctionCallError(tok, 2);
|
|
}
|
|
// pow ( x , y) If x is zero, and y is negative --> division by zero
|
|
else if (tok->varId() == 0 &&
|
|
Token::Match(tok, "pow ( %num% , %num% )") &&
|
|
MathLib::isNullValue(tok->tokAt(2)->str()) &&
|
|
MathLib::isNegative(tok->tokAt(4)->str()))
|
|
{
|
|
mathfunctionCallError(tok, 2);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
void CheckOther::checkMisusedScopedObject()
|
|
{
|
|
// Skip this check for .c files
|
|
{
|
|
const std::string fname = _tokenizer->getFiles()->at(0);
|
|
const std::string ext = fname.substr(fname.rfind("."));
|
|
if (ext == ".c" || ext == ".C")
|
|
return;
|
|
}
|
|
|
|
const SymbolDatabase * const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<SymbolDatabase::SpaceInfo *>::const_iterator i;
|
|
|
|
for (i = symbolDatabase->spaceInfoList.begin(); i != symbolDatabase->spaceInfoList.end(); ++i)
|
|
{
|
|
const SymbolDatabase::SpaceInfo *info = *i;
|
|
|
|
// only check functions
|
|
if (info->type != SymbolDatabase::SpaceInfo::Function)
|
|
continue;
|
|
|
|
unsigned int depth = 0;
|
|
|
|
for (const Token *tok = info->classStart; tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "{")
|
|
{
|
|
++depth;
|
|
}
|
|
else if (tok->str() == "}")
|
|
{
|
|
--depth;
|
|
if (depth == 0)
|
|
break;
|
|
}
|
|
|
|
if (Token::Match(tok, "[;{}] %var% (")
|
|
&& Token::Match(tok->tokAt(2)->link(), ") ;")
|
|
&& symbolDatabase->isClassOrStruct(tok->next()->str())
|
|
)
|
|
{
|
|
tok = tok->next();
|
|
misusedScopeObjectError(tok, tok->str());
|
|
tok = tok->next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::cstyleCastError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "cstyleCast", "C-style pointer casting");
|
|
}
|
|
|
|
void CheckOther::dangerousUsageStrtolError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error, "dangerousUsageStrtol", "Invalid radix in call to strtol or strtoul. Must be 0 or 2-36");
|
|
}
|
|
|
|
void CheckOther::sprintfOverlappingDataError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::error, "sprintfOverlappingData",
|
|
"Undefined behavior: variable is used as parameter and destination in s[n]printf().\n"
|
|
"The variable '" + varname + "' is used both as parameter and destination in "
|
|
"and destination buffer overlap. Quote from glibc (C-library) documentation "
|
|
"(http://www.gnu.org/software/libc/manual/html_mono/libc.html#Formatted-Output-Functions): "
|
|
"'If copying takes place between objects that overlap as a result of a call "
|
|
"to sprintf() or snprintf(), the results are undefined.'");
|
|
}
|
|
|
|
void CheckOther::udivError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error, "udivError", "Unsigned division. The result will be wrong.");
|
|
}
|
|
|
|
void CheckOther::unusedStructMemberError(const Token *tok, const std::string &structname, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::style, "unusedStructMember", "struct or union member '" + structname + "::" + varname + "' is never used");
|
|
}
|
|
|
|
void CheckOther::passedByValueError(const Token *tok, const std::string &parname)
|
|
{
|
|
reportError(tok, Severity::performance, "passedByValue",
|
|
"Function parameter '" + parname + "' should be passed by reference.\n"
|
|
"Parameter '" + parname + "' is passed as a value. It could be passed "
|
|
"as a (const) reference which is usually faster and recommended in C++.");
|
|
}
|
|
|
|
void CheckOther::constStatementError(const Token *tok, const std::string &type)
|
|
{
|
|
reportError(tok, Severity::warning, "constStatement", "Redundant code: Found a statement that begins with " + type + " constant");
|
|
}
|
|
|
|
void CheckOther::charArrayIndexError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning, "charArrayIndex", "Warning - using char variable as array index");
|
|
}
|
|
|
|
void CheckOther::charBitOpError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning, "charBitOp", "Warning - using char variable in bit operation");
|
|
}
|
|
|
|
void CheckOther::variableScopeError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok,
|
|
Severity::information,
|
|
"variableScope",
|
|
"The scope of the variable " + varname + " can be reduced\n"
|
|
"The scope of the variable " + varname + " can be reduced. Warning: It can be unsafe "
|
|
"to fix this message. Be careful. Especially when there are inner loops. Here is an "
|
|
"example where cppcheck will write that the scope for 'i' can be reduced:\n"
|
|
"void f(int x)\n"
|
|
"{\n"
|
|
" int i = 0;\n"
|
|
" if (x) {\n"
|
|
" // it's safe to move 'int i = 0' here\n"
|
|
" for (int n = 0; n < 10; ++n) {\n"
|
|
" // it is possible but not safe to move 'int i = 0' here\n"
|
|
" do_something(&i);\n"
|
|
" }\n"
|
|
" }\n"
|
|
"}\n"
|
|
"When you see this message it is always safe to reduce the variable scope 1 level.");
|
|
}
|
|
|
|
void CheckOther::conditionAlwaysTrueFalse(const Token *tok, const std::string &truefalse)
|
|
{
|
|
reportError(tok, Severity::style, "conditionAlwaysTrueFalse", "Condition is always " + truefalse);
|
|
}
|
|
|
|
void CheckOther::strPlusChar(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error, "strPlusChar", "Unusual pointer arithmetic");
|
|
}
|
|
|
|
void CheckOther::zerodivError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error, "zerodiv", "Division by zero");
|
|
}
|
|
|
|
void CheckOther::mathfunctionCallError(const Token *tok, const unsigned int numParam)
|
|
{
|
|
if (tok)
|
|
{
|
|
if (numParam == 1)
|
|
reportError(tok, Severity::error, "wrongmathcall", "Passing value " + tok->tokAt(2)->str() + " to " + tok->str() + "() leads to undefined result");
|
|
else if (numParam == 2)
|
|
reportError(tok, Severity::error, "wrongmathcall", "Passing value " + tok->tokAt(2)->str() + " and " + tok->tokAt(4)->str() + " to " + tok->str() + "() leads to undefined result");
|
|
}
|
|
else
|
|
reportError(tok, Severity::error, "wrongmathcall", "Passing value " " to " "() leads to undefined result");
|
|
}
|
|
|
|
void CheckOther::fflushOnInputStreamError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"fflushOnInputStream", "fflush() called on input stream \"" + varname + "\" may result in undefined behaviour");
|
|
}
|
|
|
|
void CheckOther::sizeofsizeof()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::simpleMatch(tok, "sizeof sizeof"))
|
|
sizeofsizeofError(tok);
|
|
}
|
|
}
|
|
|
|
void CheckOther::sizeofsizeofError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"sizeofsizeof", "Calling sizeof for 'sizeof'.\n"
|
|
"This is suspicious code and most likely there should be just"
|
|
"one 'sizeof'. The current code is equivalent to 'sizeof(size_t)'");
|
|
}
|
|
|
|
void CheckOther::sizeofCalculation()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::simpleMatch(tok, "sizeof ("))
|
|
{
|
|
unsigned int parlevel = 0;
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "(")
|
|
++parlevel;
|
|
else if (tok2->str() == ")")
|
|
{
|
|
if (parlevel <= 1)
|
|
break;
|
|
--parlevel;
|
|
}
|
|
else if (Token::Match(tok2, "+|/"))
|
|
{
|
|
sizeofCalculationError(tok2);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::sizeofCalculationError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"sizeofCalculation", "Found calculation inside sizeof()");
|
|
}
|
|
|
|
void CheckOther::redundantAssignmentInSwitchError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"redundantAssignInSwitch", "Redundant assignment of \"" + varname + "\" in switch");
|
|
}
|
|
|
|
void CheckOther::selfAssignmentError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"selfAssignment", "Redundant assignment of \"" + varname + "\" to itself");
|
|
}
|
|
|
|
void CheckOther::assignmentInAssertError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"assignmentInAssert", "Assert statement modifies '" + varname + "'.\n"
|
|
"Assert statements are removed from release builds so the code inside "
|
|
"assert statement is not run. If the code is needed also in release "
|
|
"builds this is a bug.");
|
|
}
|
|
|
|
void CheckOther::incorrectLogicOperatorError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"incorrectLogicOperator", "Mutual exclusion over || always evaluates to true. Did you intend to use && instead?");
|
|
}
|
|
|
|
void CheckOther::misusedScopeObjectError(const Token *tok, const std::string& varname)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"unusedScopedObject", "instance of \"" + varname + "\" object destroyed immediately");
|
|
}
|
|
|
|
void CheckOther::catchExceptionByValueError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style,
|
|
"catchExceptionByValue", "Exception should be caught by reference.\n"
|
|
"The exception is caught as a value. It could be caught "
|
|
"as a (const) reference which is usually recommended in C++.");
|
|
}
|
|
|
|
void CheckOther::memsetZeroBytesError(const Token *tok, const std::string &varname)
|
|
{
|
|
const std::string summary("memset() called to fill 0 bytes of \'" + varname + "\'");
|
|
const std::string verbose(summary + ". Second and third arguments might be inverted.");
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reportError(tok, Severity::warning, "memsetZeroBytes", summary + "\n" + verbose);
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}
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