3588 lines
122 KiB
C++
3588 lines
122 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
#include "checkother.h"
|
|
#include "mathlib.h"
|
|
#include "symboldatabase.h"
|
|
|
|
#include <cctype> // std::isupper
|
|
#include <cmath> // fabs()
|
|
#include <stack>
|
|
//---------------------------------------------------------------------------
|
|
|
|
// Register this check class (by creating a static instance of it)
|
|
namespace
|
|
{
|
|
CheckOther instance;
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkIncrementBoolean()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "%var% ++"))
|
|
{
|
|
if (tok->varId())
|
|
{
|
|
const Token *declTok = Token::findmatch(_tokenizer->tokens(), "bool %varid%", tok->varId());
|
|
if (declTok)
|
|
incrementBooleanError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::incrementBooleanError(const Token *tok)
|
|
{
|
|
reportError(
|
|
tok,
|
|
Severity::style,
|
|
"incrementboolean",
|
|
"The use of a variable of type bool with the ++ postfix operator is always true and deprecated by the C++ Standard.\n"
|
|
"The operand of a postfix increment operator may be of type bool but it is deprecated by C++ Standard (Annex D-1) and the operand is always set to true\n"
|
|
);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
void CheckOther::clarifyCalculation()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->strAt(1) == "?")
|
|
{
|
|
// condition
|
|
const Token *cond = tok;
|
|
if (cond->isName() || cond->isNumber())
|
|
cond = cond->previous();
|
|
else if (cond->str() == ")")
|
|
cond = cond->link()->previous();
|
|
else
|
|
continue;
|
|
|
|
// calculation
|
|
if (!cond->isArithmeticalOp())
|
|
continue;
|
|
|
|
const std::string &op = cond->str();
|
|
cond = cond->previous();
|
|
|
|
// skip previous multiplications..
|
|
while (cond && cond->strAt(-1) == "*" && (cond->isName() || cond->isNumber()))
|
|
cond = cond->tokAt(-2);
|
|
|
|
if (!cond)
|
|
continue;
|
|
|
|
// first multiplication operand
|
|
if (cond->str() == ")")
|
|
{
|
|
clarifyCalculationError(cond, op);
|
|
}
|
|
else if (cond->isName() || cond->isNumber())
|
|
{
|
|
if (Token::Match(cond->previous(),("return|=|+|-|,|(|"+op).c_str()))
|
|
clarifyCalculationError(cond, op);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::clarifyCalculationError(const Token *tok, const std::string &op)
|
|
{
|
|
// suspicious calculation
|
|
const std::string calc("'a" + op + "b?c:d'");
|
|
|
|
// recommended calculation #1
|
|
const std::string s1("'(a" + op + "b)?c:d'");
|
|
|
|
// recommended calculation #2
|
|
const std::string s2("'a" + op + "(b?c:d)'");
|
|
|
|
reportError(tok,
|
|
Severity::style,
|
|
"clarifyCalculation",
|
|
"Clarify calculation precedence for " + op + " and ?\n"
|
|
"Suspicious calculation. Please use parentheses to clarify the code. "
|
|
"The code " + calc + " should be written as either " + s1 + " or " + s2 + ".");
|
|
}
|
|
|
|
|
|
// Clarify condition '(x = a < 0)' into '((x = a) < 0)' or '(x = (a < 0))'
|
|
void CheckOther::clarifyCondition()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "( %var% ="))
|
|
{
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "(" || tok2->str() == "[")
|
|
tok2 = tok2->link();
|
|
else if (Token::Match(tok2, "&&|%oror%|?|)"))
|
|
break;
|
|
else if (Token::Match(tok2, "<|<=|==|!=|>|>= %num% )"))
|
|
{
|
|
clarifyConditionError(tok);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::clarifyConditionError(const Token *tok)
|
|
{
|
|
reportError(tok,
|
|
Severity::style,
|
|
"clarifyCondition",
|
|
"Suspicious condition (assignment+comparison), it can be clarified with parentheses");
|
|
}
|
|
|
|
|
|
|
|
void CheckOther::warningOldStylePointerCast()
|
|
{
|
|
if (!_settings->_checkCodingStyle ||
|
|
(_tokenizer->tokens() && _tokenizer->fileLine(_tokenizer->tokens()).find(".cpp") == std::string::npos))
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Old style pointer casting..
|
|
if (!Token::Match(tok, "( const| %type% * ) %var%") &&
|
|
!Token::Match(tok, "( const| %type% * ) (| new"))
|
|
continue;
|
|
|
|
int addToIndex = 0;
|
|
if (tok->tokAt(1)->str() == "const")
|
|
addToIndex = 1;
|
|
|
|
if (tok->tokAt(4 + addToIndex)->str() == "const")
|
|
continue;
|
|
|
|
// Is "type" a class?
|
|
const std::string pattern("class " + tok->tokAt(1 + addToIndex)->str());
|
|
if (!Token::findmatch(_tokenizer->tokens(), pattern.c_str()))
|
|
continue;
|
|
|
|
cstyleCastError(tok);
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// fflush(stdin) <- fflush only applies to output streams in ANSI C
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkFflushOnInputStream()
|
|
{
|
|
const Token *tok = _tokenizer->tokens();
|
|
while (tok && ((tok = Token::findmatch(tok, "fflush ( stdin )")) != NULL))
|
|
{
|
|
fflushOnInputStreamError(tok, tok->strAt(2));
|
|
tok = tok->tokAt(4);
|
|
}
|
|
}
|
|
|
|
|
|
void CheckOther::checkSizeofForArrayParameter()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "sizeof ( %var% )") || Token::Match(tok, "sizeof %var%"))
|
|
{
|
|
int tokIdx = 1;
|
|
if (tok->tokAt(tokIdx)->str() == "(")
|
|
{
|
|
++tokIdx;
|
|
}
|
|
if (tok->tokAt(tokIdx)->varId() > 0)
|
|
{
|
|
const Token *declTok = Token::findmatch(_tokenizer->tokens(), "%varid%", tok->tokAt(tokIdx)->varId());
|
|
if (declTok)
|
|
{
|
|
if (Token::simpleMatch(declTok->next(), "["))
|
|
{
|
|
declTok = declTok->next()->link();
|
|
// multidimensional array
|
|
while (Token::simpleMatch(declTok->next(), "["))
|
|
{
|
|
declTok = declTok->next()->link();
|
|
}
|
|
if (!(Token::Match(declTok->next(), "= %str%")) && !(Token::simpleMatch(declTok->next(), "= {")) && !(Token::simpleMatch(declTok->next(), ";")))
|
|
{
|
|
if (Token::simpleMatch(declTok->next(), ","))
|
|
{
|
|
declTok = declTok->next();
|
|
while (!Token::simpleMatch(declTok, ";"))
|
|
{
|
|
if (Token::simpleMatch(declTok, ")"))
|
|
{
|
|
sizeofForArrayParameterError(tok);
|
|
break;
|
|
}
|
|
if (Token::Match(declTok, "(|[|{"))
|
|
{
|
|
declTok = declTok->link();
|
|
}
|
|
declTok = declTok->next();
|
|
}
|
|
}
|
|
}
|
|
if (Token::simpleMatch(declTok->next(), ")"))
|
|
{
|
|
sizeofForArrayParameterError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// switch (x)
|
|
// {
|
|
// case 2:
|
|
// y = a; // <- this assignment is redundant
|
|
// case 3:
|
|
// y = b; // <- case 2 falls through and sets y twice
|
|
// }
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkRedundantAssignmentInSwitch()
|
|
{
|
|
const char switchPattern[] = "switch ( %any% ) { case";
|
|
const char breakPattern[] = "break|continue|return|exit|goto|throw";
|
|
const char functionPattern[] = "%var% (";
|
|
|
|
// Find the beginning of a switch. E.g.:
|
|
// switch (var) { ...
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), switchPattern);
|
|
while (tok)
|
|
{
|
|
|
|
// Check the contents of the switch statement
|
|
std::map<unsigned int, const Token*> varsAssigned;
|
|
int indentLevel = 0;
|
|
for (const Token *tok2 = tok->tokAt(5); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "{")
|
|
{
|
|
// Inside a conditional or loop. Don't mark variable accesses as being redundant. E.g.:
|
|
// case 3: b = 1;
|
|
// case 4: if (a) { b = 2; } // Doesn't make the b=1 redundant because it's conditional
|
|
if (Token::Match(tok2->previous(), ")|else {") && tok2->link())
|
|
{
|
|
const Token* endOfConditional = tok2->link();
|
|
for (const Token* tok3 = tok2; tok3 != endOfConditional; tok3 = tok3->next())
|
|
{
|
|
if (tok3->varId() != 0)
|
|
varsAssigned.erase(tok3->varId());
|
|
else if (Token::Match(tok3, functionPattern) || Token::Match(tok3, breakPattern))
|
|
varsAssigned.clear();
|
|
}
|
|
tok2 = endOfConditional;
|
|
}
|
|
else
|
|
++ indentLevel;
|
|
}
|
|
else if (tok2->str() == "}")
|
|
{
|
|
-- indentLevel;
|
|
|
|
// End of the switch block
|
|
if (indentLevel < 0)
|
|
break;
|
|
}
|
|
|
|
// Variable assignment. Report an error if it's assigned to twice before a break. E.g.:
|
|
// case 3: b = 1; // <== redundant
|
|
// case 4: b = 2;
|
|
if (Token::Match(tok2->previous(), ";|{|}|: %var% = %any% ;") && tok2->varId() != 0)
|
|
{
|
|
std::map<unsigned int, const Token*>::iterator i = varsAssigned.find(tok2->varId());
|
|
if (i == varsAssigned.end())
|
|
varsAssigned[tok2->varId()] = tok2;
|
|
else
|
|
redundantAssignmentInSwitchError(i->second, i->second->str());
|
|
}
|
|
// Not a simple assignment so there may be good reason if this variable is assigned to twice. E.g.:
|
|
// case 3: b = 1;
|
|
// case 4: b++;
|
|
else if (tok2->varId() != 0)
|
|
varsAssigned.erase(tok2->varId());
|
|
|
|
// Reset our record of assignments if there is a break or function call. E.g.:
|
|
// case 3: b = 1; break;
|
|
if (Token::Match(tok2, functionPattern) || Token::Match(tok2, breakPattern))
|
|
varsAssigned.clear();
|
|
|
|
}
|
|
|
|
tok = Token::findmatch(tok->next(), switchPattern);
|
|
}
|
|
}
|
|
|
|
|
|
void CheckOther::checkSwitchCaseFallThrough()
|
|
{
|
|
if (!(_settings->_checkCodingStyle && _settings->experimental))
|
|
return;
|
|
|
|
const char switchPattern[] = "switch (";
|
|
const char breakPattern[] = "break|continue|return|exit|goto|throw";
|
|
|
|
// Find the beginning of a switch. E.g.:
|
|
// switch (var) { ...
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), switchPattern);
|
|
while (tok)
|
|
{
|
|
|
|
// Check the contents of the switch statement
|
|
std::stack<std::pair<Token *, bool> > ifnest;
|
|
std::stack<Token *> loopnest;
|
|
std::stack<Token *> scopenest;
|
|
bool justbreak = true;
|
|
bool firstcase = true;
|
|
for (const Token *tok2 = tok->tokAt(1)->link()->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (Token::Match(tok2, "if ("))
|
|
{
|
|
tok2 = tok2->tokAt(1)->link()->next();
|
|
if (tok2->link() == NULL)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unmatched if in switch: " << tok2->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
break;
|
|
}
|
|
ifnest.push(std::make_pair(tok2->link(), false));
|
|
justbreak = false;
|
|
}
|
|
else if (Token::Match(tok2, "while ("))
|
|
{
|
|
tok2 = tok2->tokAt(1)->link()->next();
|
|
// skip over "do { } while ( ) ;" case
|
|
if (tok2->str() == "{")
|
|
{
|
|
if (tok2->link() == NULL)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unmatched while in switch: " << tok2->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
break;
|
|
}
|
|
loopnest.push(tok2->link());
|
|
}
|
|
justbreak = false;
|
|
}
|
|
else if (Token::Match(tok2, "do {"))
|
|
{
|
|
tok2 = tok2->tokAt(1);
|
|
if (tok2->link() == NULL)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unmatched do in switch: " << tok2->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
break;
|
|
}
|
|
loopnest.push(tok2->link());
|
|
justbreak = false;
|
|
}
|
|
else if (Token::Match(tok2, "for ("))
|
|
{
|
|
tok2 = tok2->tokAt(1)->link()->next();
|
|
if (tok2->link() == NULL)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unmatched for in switch: " << tok2->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
break;
|
|
}
|
|
loopnest.push(tok2->link());
|
|
justbreak = false;
|
|
}
|
|
else if (Token::Match(tok2, switchPattern))
|
|
{
|
|
// skip over nested switch, we'll come to that soon
|
|
tok2 = tok2->tokAt(1)->link()->next()->link();
|
|
}
|
|
else if (Token::Match(tok2, breakPattern))
|
|
{
|
|
if (loopnest.empty())
|
|
{
|
|
justbreak = true;
|
|
}
|
|
tok2 = Token::findmatch(tok2, ";");
|
|
}
|
|
else if (Token::Match(tok2, "case|default"))
|
|
{
|
|
if (!justbreak && !firstcase)
|
|
{
|
|
switchCaseFallThrough(tok2);
|
|
}
|
|
tok2 = Token::findmatch(tok2, ":");
|
|
justbreak = true;
|
|
firstcase = false;
|
|
}
|
|
else if (tok2->str() == "{")
|
|
{
|
|
scopenest.push(tok2->link());
|
|
}
|
|
else if (tok2->str() == "}")
|
|
{
|
|
if (!ifnest.empty() && tok2 == ifnest.top().first)
|
|
{
|
|
if (tok2->next()->str() == "else")
|
|
{
|
|
tok2 = tok2->tokAt(2);
|
|
ifnest.pop();
|
|
if (tok2->link() == NULL)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unmatched if in switch: " << tok2->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
break;
|
|
}
|
|
ifnest.push(std::make_pair(tok2->link(), justbreak));
|
|
justbreak = false;
|
|
}
|
|
else
|
|
{
|
|
justbreak &= ifnest.top().second;
|
|
ifnest.pop();
|
|
}
|
|
}
|
|
else if (!loopnest.empty() && tok2 == loopnest.top())
|
|
{
|
|
loopnest.pop();
|
|
}
|
|
else if (!scopenest.empty() && tok2 == scopenest.top())
|
|
{
|
|
scopenest.pop();
|
|
}
|
|
else
|
|
{
|
|
if (!ifnest.empty() || !loopnest.empty() || !scopenest.empty())
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "unexpected end of switch: ";
|
|
errmsg << "ifnest=" << ifnest.size();
|
|
if (!ifnest.empty())
|
|
errmsg << "," << ifnest.top().first->linenr();
|
|
errmsg << ", loopnest=" << loopnest.size();
|
|
if (!loopnest.empty())
|
|
errmsg << "," << loopnest.top()->linenr();
|
|
errmsg << ", scopenest=" << scopenest.size();
|
|
if (!scopenest.empty())
|
|
errmsg << "," << scopenest.top()->linenr();
|
|
reportError(_tokenizer->tokens(), Severity::debug, "debug", errmsg.str());
|
|
}
|
|
// end of switch block
|
|
break;
|
|
}
|
|
}
|
|
else if (tok2->str() != ";")
|
|
{
|
|
justbreak = false;
|
|
}
|
|
|
|
}
|
|
|
|
tok = Token::findmatch(tok->next(), switchPattern);
|
|
}
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// int x = 1;
|
|
// x = x; // <- redundant assignment to self
|
|
//
|
|
// int y = y; // <- redundant initialization to self
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkSelfAssignment()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
// POD variables..
|
|
std::set<unsigned int> pod;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (tok->isStandardType() && Token::Match(tok->tokAt(2), "[,);]") && tok->next()->varId())
|
|
pod.insert(tok->next()->varId());
|
|
}
|
|
|
|
const char selfAssignmentPattern[] = "%var% = %var% ;|=|)";
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), selfAssignmentPattern);
|
|
while (tok)
|
|
{
|
|
if (Token::Match(tok->previous(), "[;{}]") &&
|
|
tok->varId() && tok->varId() == tok->tokAt(2)->varId() &&
|
|
pod.find(tok->varId()) != pod.end())
|
|
{
|
|
selfAssignmentError(tok, tok->str());
|
|
}
|
|
|
|
tok = Token::findmatch(tok->next(), selfAssignmentPattern);
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// int a = 1;
|
|
// assert(a = 2); // <- assert should not have a side-effect
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkAssignmentInAssert()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const char assertPattern[] = "assert ( %any%";
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), assertPattern);
|
|
const Token *endTok = tok ? tok->next()->link() : NULL;
|
|
|
|
while (tok && endTok)
|
|
{
|
|
const Token* varTok = Token::findmatch(tok->tokAt(2), "%var% --|++|+=|-=|*=|/=|&=|^=|=", endTok);
|
|
if (varTok)
|
|
{
|
|
assignmentInAssertError(tok, varTok->str());
|
|
}
|
|
else if (NULL != (varTok = Token::findmatch(tok->tokAt(2), "--|++ %var%", endTok)))
|
|
{
|
|
assignmentInAssertError(tok, varTok->strAt(1));
|
|
}
|
|
|
|
tok = Token::findmatch(endTok->next(), assertPattern);
|
|
endTok = tok ? tok->next()->link() : NULL;
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// if ((x != 1) || (x != 3)) // <- always true
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkIncorrectLogicOperator()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const char conditionPattern[] = "if|while (";
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), conditionPattern);
|
|
const Token *endTok = tok ? tok->next()->link() : NULL;
|
|
|
|
while (tok && endTok)
|
|
{
|
|
// Find a pair of OR'd terms, with or without parenthesis
|
|
// e.g. if (x != 3 || x != 4)
|
|
const Token *logicTok = NULL, *term1Tok = NULL, *term2Tok = NULL;
|
|
if (NULL != (logicTok = Token::findmatch(tok, "( %any% != %any% ) %oror% ( %any% != %any% ) !!&&", endTok)))
|
|
{
|
|
term1Tok = logicTok->next();
|
|
term2Tok = logicTok->tokAt(7);
|
|
}
|
|
else if (NULL != (logicTok = Token::findmatch(tok, "%any% != %any% %oror% %any% != %any% !!&&", endTok)))
|
|
{
|
|
term1Tok = logicTok;
|
|
term2Tok = logicTok->tokAt(4);
|
|
}
|
|
|
|
// The terms must not be AND'd with anything, to prevent false positives
|
|
if (logicTok && (logicTok->strAt(-1) != "&&"))
|
|
{
|
|
// Find the common variable and the two different-valued constants
|
|
unsigned int variableTested = 0;
|
|
std::string firstConstant, secondConstant;
|
|
if (Token::Match(term1Tok, "%var% != %num%"))
|
|
{
|
|
const unsigned int varId = term1Tok->varId();
|
|
if (!varId)
|
|
{
|
|
tok = Token::findmatch(endTok->next(), conditionPattern);
|
|
endTok = tok ? tok->next()->link() : NULL;
|
|
continue;
|
|
}
|
|
firstConstant = term1Tok->tokAt(2)->str();
|
|
|
|
if (Token::Match(term2Tok, "%varid% != %num%", varId))
|
|
{
|
|
variableTested = varId;
|
|
secondConstant = term2Tok->tokAt(2)->str();
|
|
}
|
|
else if (Token::Match(term2Tok, "%num% != %varid%", varId))
|
|
{
|
|
variableTested = varId;
|
|
secondConstant = term2Tok->str();
|
|
}
|
|
}
|
|
else if (Token::Match(term1Tok, "%num% != %var%"))
|
|
{
|
|
const unsigned int varId = term1Tok->tokAt(2)->varId();
|
|
firstConstant = term1Tok->str();
|
|
|
|
if (Token::Match(term2Tok, "%varid% != %num%", varId))
|
|
{
|
|
variableTested = varId;
|
|
secondConstant = term2Tok->tokAt(2)->str();
|
|
}
|
|
else if (Token::Match(term2Tok, "%num% != %varid%", varId))
|
|
{
|
|
variableTested = varId;
|
|
secondConstant = term2Tok->str();
|
|
}
|
|
}
|
|
|
|
// If there is a common variable tested for inequality against
|
|
// either of two different-valued constants, then the expression
|
|
// will always evaluate to true and the || probably should be an &&
|
|
if (variableTested != 0 &&
|
|
!firstConstant.empty() &&
|
|
!secondConstant.empty() &&
|
|
firstConstant != secondConstant)
|
|
{
|
|
incorrectLogicOperatorError(term1Tok);
|
|
}
|
|
}
|
|
|
|
tok = Token::findmatch(endTok->next(), conditionPattern);
|
|
endTok = tok ? tok->next()->link() : NULL;
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// try {} catch (std::exception err) {} <- Should be "std::exception& err"
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkCatchExceptionByValue()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const char catchPattern[] = "} catch (";
|
|
const Token *tok = Token::findmatch(_tokenizer->tokens(), catchPattern);
|
|
const Token *endTok = tok ? tok->tokAt(2)->link() : NULL;
|
|
|
|
while (tok && endTok)
|
|
{
|
|
// Find a pass-by-value declaration in the catch(), excluding basic types
|
|
// e.g. catch (std::exception err)
|
|
const Token *tokType = Token::findmatch(tok, "%type% %var% )", endTok);
|
|
if (tokType && !tokType->isStandardType())
|
|
{
|
|
catchExceptionByValueError(tokType);
|
|
}
|
|
|
|
tok = Token::findmatch(endTok->next(), catchPattern);
|
|
endTok = tok ? tok->tokAt(2)->link() : NULL;
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// strtol(str, 0, radix) <- radix must be 0 or 2-36
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::invalidFunctionUsage()
|
|
{
|
|
// strtol and strtoul..
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (!Token::Match(tok, "strtol|strtoul ("))
|
|
continue;
|
|
|
|
// Locate the third parameter of the function call..
|
|
int param = 1;
|
|
for (const Token *tok2 = tok->tokAt(2); tok2; tok2 = tok2->next())
|
|
{
|
|
if (tok2->str() == "(")
|
|
tok2 = tok2->link();
|
|
else if (tok2->str() == ")")
|
|
break;
|
|
else if (tok2->str() == ",")
|
|
{
|
|
++param;
|
|
if (param == 3)
|
|
{
|
|
if (Token::Match(tok2, ", %num% )"))
|
|
{
|
|
const MathLib::bigint radix = MathLib::toLongNumber(tok2->next()->str());
|
|
if (!(radix == 0 || (radix >= 2 && radix <= 36)))
|
|
{
|
|
dangerousUsageStrtolError(tok2);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// sprintf|snprintf overlapping data
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
// Get variable id of target buffer..
|
|
unsigned int varid = 0;
|
|
|
|
if (Token::Match(tok, "sprintf|snprintf ( %var% ,"))
|
|
varid = tok->tokAt(2)->varId();
|
|
|
|
else if (Token::Match(tok, "sprintf|snprintf ( %var% . %var% ,"))
|
|
varid = tok->tokAt(4)->varId();
|
|
|
|
if (varid == 0)
|
|
continue;
|
|
|
|
// goto ","
|
|
const Token *tok2 = tok->tokAt(3);
|
|
while (tok2 && tok2->str() != ",")
|
|
tok2 = tok2->next();
|
|
|
|
// is any source buffer overlapping the target buffer?
|
|
int parlevel = 0;
|
|
while ((tok2 = tok2->next()) != NULL)
|
|
{
|
|
if (tok2->str() == "(")
|
|
++parlevel;
|
|
else if (tok2->str() == ")")
|
|
{
|
|
--parlevel;
|
|
if (parlevel < 0)
|
|
break;
|
|
}
|
|
else if (parlevel == 0 && Token::Match(tok2, ", %varid% [,)]", varid))
|
|
{
|
|
sprintfOverlappingDataError(tok2->next(), tok2->next()->str());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::invalidScanf()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
const Token *formatToken = 0;
|
|
if (Token::Match(tok, "scanf|vscanf ( %str% ,"))
|
|
formatToken = tok->tokAt(2);
|
|
else if (Token::Match(tok, "fscanf|vfscanf ( %var% , %str% ,"))
|
|
formatToken = tok->tokAt(4);
|
|
else
|
|
continue;
|
|
|
|
bool format = false;
|
|
|
|
// scan the string backwards, so we dont need to keep states
|
|
const std::string &formatstr(formatToken->str());
|
|
for (unsigned int i = 1; i < formatstr.length(); i++)
|
|
{
|
|
if (formatstr[i] == '%')
|
|
format = !format;
|
|
|
|
else if (!format)
|
|
continue;
|
|
|
|
else if (std::isdigit(formatstr[i]))
|
|
{
|
|
format = false;
|
|
}
|
|
|
|
else if (std::isalpha(formatstr[i]))
|
|
{
|
|
invalidScanfError(tok);
|
|
format = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// if (!x==3) <- Probably meant to be "x!=3"
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkComparisonOfBoolWithInt()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "( ! %var% ==|!= %num% )"))
|
|
{
|
|
const Token *numTok = tok->tokAt(4);
|
|
if (numTok && numTok->str() != "0")
|
|
{
|
|
comparisonOfBoolWithIntError(numTok, tok->strAt(2));
|
|
}
|
|
}
|
|
else if (Token::Match(tok, "( %num% ==|!= ! %var% )"))
|
|
{
|
|
const Token *numTok = tok->tokAt(1);
|
|
if (numTok && numTok->str() != "0")
|
|
{
|
|
comparisonOfBoolWithIntError(numTok, tok->strAt(4));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::sizeofForArrayParameterError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"sizeofwithsilentarraypointer", "Using sizeof for array given as function argument "
|
|
"returns the size of pointer.\n"
|
|
"Giving array as function parameter and then using sizeof-operator for the array "
|
|
"argument. In this case the sizeof-operator returns the size of pointer (in the "
|
|
"system). It does not return the size of the whole array in bytes as might be "
|
|
"expected. For example, this code:\n"
|
|
" int f(char a[100]) {\n"
|
|
" return sizeof(a);\n"
|
|
" }\n"
|
|
" returns 4 (in 32-bit systems) or 8 (in 64-bit systems) instead of 100 (the "
|
|
"size of the array in bytes)."
|
|
);
|
|
}
|
|
void CheckOther::invalidScanfError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"invalidscanf", "scanf without field width limits can crash with huge input data\n"
|
|
"scanf without field width limits can crash with huge input data. To fix this error "
|
|
"message add a field width specifier:\n"
|
|
" %s => %20s\n"
|
|
" %i => %3i\n"
|
|
"\n"
|
|
"Sample program that can crash:\n"
|
|
"\n"
|
|
"#include <stdio.h>\n"
|
|
"int main()\n"
|
|
"{\n"
|
|
" int a;\n"
|
|
" scanf(\"%i\", &a);\n"
|
|
" return 0;\n"
|
|
"}\n"
|
|
"\n"
|
|
"To make it crash:\n"
|
|
"perl -e 'print \"5\"x2100000' | ./a.out");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check for unsigned divisions
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkUnsignedDivision()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
// Check for "ivar / uvar" and "uvar / ivar"
|
|
std::map<unsigned int, char> varsign;
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "[{};(,] %type% %var% [;=,)]"))
|
|
{
|
|
if (tok->tokAt(1)->isUnsigned())
|
|
varsign[tok->tokAt(2)->varId()] = 'u';
|
|
else
|
|
varsign[tok->tokAt(2)->varId()] = 's';
|
|
}
|
|
|
|
else if (!Token::Match(tok, "[).]") && Token::Match(tok->next(), "%var% / %num%"))
|
|
{
|
|
if (tok->strAt(3)[0] == '-')
|
|
{
|
|
char sign1 = varsign[tok->tokAt(1)->varId()];
|
|
if (sign1 == 'u')
|
|
{
|
|
udivError(tok->next());
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (Token::Match(tok, "(|[|=|%op% %num% / %var%"))
|
|
{
|
|
if (tok->strAt(1)[0] == '-')
|
|
{
|
|
char sign2 = varsign[tok->tokAt(3)->varId()];
|
|
if (sign2 == 'u')
|
|
{
|
|
udivError(tok->next());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// memset(p, y, 0 /* bytes to fill */) <- 2nd and 3rd arguments inverted
|
|
//---------------------------------------------------------------------------
|
|
void CheckOther::checkMemsetZeroBytes()
|
|
{
|
|
const Token *tok = _tokenizer->tokens();
|
|
while (tok && ((tok = Token::findmatch(tok, "memset ( %var% , %num% , 0 )")) != NULL))
|
|
{
|
|
memsetZeroBytesError(tok, tok->strAt(2));
|
|
tok = tok->tokAt(8);
|
|
}
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Usage of function variables
|
|
//---------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @brief This class is used to capture the control flow within a function.
|
|
*/
|
|
class ScopeInfo
|
|
{
|
|
public:
|
|
ScopeInfo() : _token(NULL), _parent(NULL) { }
|
|
ScopeInfo(const Token *token, ScopeInfo *parent_) : _token(token), _parent(parent_) { }
|
|
~ScopeInfo();
|
|
|
|
ScopeInfo *parent()
|
|
{
|
|
return _parent;
|
|
}
|
|
ScopeInfo *addChild(const Token *token);
|
|
void remove(ScopeInfo *scope);
|
|
|
|
private:
|
|
const Token *_token;
|
|
ScopeInfo *_parent;
|
|
std::list<ScopeInfo *> _children;
|
|
};
|
|
|
|
ScopeInfo::~ScopeInfo()
|
|
{
|
|
while (!_children.empty())
|
|
{
|
|
delete *_children.begin();
|
|
_children.pop_front();
|
|
}
|
|
}
|
|
|
|
ScopeInfo *ScopeInfo::addChild(const Token *token)
|
|
{
|
|
ScopeInfo *temp = new ScopeInfo(token, this);
|
|
|
|
_children.push_back(temp);
|
|
|
|
return temp;
|
|
}
|
|
|
|
void ScopeInfo::remove(ScopeInfo *scope)
|
|
{
|
|
std::list<ScopeInfo *>::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,
|
|
ScopeInfo *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;
|
|
ScopeInfo *_scope;
|
|
bool _read;
|
|
bool _write;
|
|
bool _modified; // read/modify/write
|
|
bool _allocateMemory;
|
|
std::set<unsigned int> _aliases;
|
|
std::set<ScopeInfo *> _assignments;
|
|
};
|
|
|
|
typedef std::map<unsigned int, VariableUsage> VariableMap;
|
|
|
|
void clear()
|
|
{
|
|
_varUsage.clear();
|
|
}
|
|
VariableMap &varUsage()
|
|
{
|
|
return _varUsage;
|
|
}
|
|
void addVar(const Token *name, VariableType type, ScopeInfo *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,
|
|
ScopeInfo *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, ScopeInfo *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<ScopeInfo *>::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<ScopeInfo *>::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<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
// First token for the current scope..
|
|
const Token *const tok1 = scope->classStart;
|
|
|
|
// varId, usage {read, write, modified}
|
|
Variables variables;
|
|
|
|
// scopes
|
|
ScopeInfo scopes;
|
|
ScopeInfo *info = &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 = ScopeInfo(tok, NULL);
|
|
// add the new scope
|
|
else
|
|
info = info->addChild(tok);
|
|
++indentlevel;
|
|
}
|
|
else if (tok->str() == "}")
|
|
{
|
|
--indentlevel;
|
|
|
|
info = info->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, info,
|
|
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, info, 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, info,
|
|
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::simpleMatch(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, info, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(2), false, info);
|
|
|
|
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, info, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(3), false, info);
|
|
|
|
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, info, written || isStatic);
|
|
|
|
int offset = 0;
|
|
|
|
// check for assignment
|
|
if (written)
|
|
offset = doAssignment(variables, tok->tokAt(3), false, info);
|
|
|
|
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, info, 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, info,
|
|
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, info,
|
|
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, info));
|
|
|
|
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 Scope *type = symbolDatabase->findVariableType(&(*scope), 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 == Scope::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.read(tok->next()->varId());
|
|
|
|
else if (Token::Match(tok, "%var% ."))
|
|
variables.use(tok->varId()); // use = read + write
|
|
|
|
else if ((Token::Match(tok, "[(=&!]") || tok->isExtendedOp()) &&
|
|
(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() == ")" || tok->next()->isExtendedOp()))
|
|
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<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
// Walk through all tokens..
|
|
int indentlevel = 0;
|
|
for (const Token *tok = scope->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() == "{")
|
|
{
|
|
if (tok->strAt(-1) == "=")
|
|
{
|
|
if (Token::findmatch(tok, varname.c_str(), tok->link()))
|
|
{
|
|
return;
|
|
}
|
|
|
|
tok = tok->link();
|
|
}
|
|
else
|
|
++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())
|
|
{
|
|
// TODO: False negatives. This pattern only checks for string.
|
|
// Investigate if there are other classes in the std
|
|
// namespace and add them to the pattern. There are
|
|
// streams for example (however it seems strange with
|
|
// const stream parameter).
|
|
if (Token::Match(tok, "[,(] const std :: string %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();
|
|
if (Token::simpleMatch(tok, ") {") && Token::simpleMatch(tok->next()->link(), "} ;"))
|
|
tok = tok->next()->link();
|
|
}
|
|
|
|
else if (Token::simpleMatch(tok, "= {"))
|
|
tok = tok->next()->link();
|
|
|
|
else if (tok->str() == "{" && Token::Match(tok->tokAt(-2), "%type% %var%"))
|
|
tok = tok->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|sqrtf|sqrtl ( %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);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/** Is there a function with given name? */
|
|
static bool isFunction(const std::string &name, const Token *startToken)
|
|
{
|
|
const std::string pattern1(name + " (");
|
|
for (const Token *tok = startToken; tok; tok = tok->next())
|
|
{
|
|
// skip executable scopes etc
|
|
if (tok->str() == "(")
|
|
{
|
|
tok = tok->link();
|
|
if (Token::simpleMatch(tok, ") {"))
|
|
tok = tok->next()->link();
|
|
else if (Token::simpleMatch(tok, ") const {"))
|
|
tok = tok->tokAt(2)->link();
|
|
}
|
|
|
|
// function declaration/implementation found
|
|
if ((tok->str() == "*" || (tok->isName() && tok->str().find(":") ==std::string::npos))
|
|
&& Token::simpleMatch(tok->next(), pattern1.c_str()))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
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<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
unsigned int depth = 0;
|
|
|
|
for (const Token *tok = scope->classStart; tok; tok = tok->next())
|
|
{
|
|
if (tok->str() == "{")
|
|
{
|
|
++depth;
|
|
}
|
|
else if (tok->str() == "}")
|
|
{
|
|
--depth;
|
|
if (depth == 0)
|
|
break;
|
|
}
|
|
|
|
if (Token::Match(tok, "[;{}] %var% (")
|
|
&& Token::simpleMatch(tok->tokAt(2)->link(), ") ;")
|
|
&& symbolDatabase->isClassOrStruct(tok->next()->str())
|
|
&& !isFunction(tok->next()->str(), _tokenizer->tokens()))
|
|
{
|
|
tok = tok->next();
|
|
misusedScopeObjectError(tok, tok->str());
|
|
tok = tok->next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::checkIncorrectStringCompare()
|
|
{
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, ". substr ( %any% , %num% ) ==|!= %str%"))
|
|
{
|
|
size_t clen = MathLib::toLongNumber(tok->tokAt(5)->str());
|
|
size_t slen = Token::getStrLength(tok->tokAt(8));
|
|
if (clen != slen)
|
|
{
|
|
incorrectStringCompareError(tok->next(), "substr", tok->tokAt(8)->str(), tok->tokAt(5)->str());
|
|
}
|
|
}
|
|
if (Token::Match(tok, "%str% ==|!= %var% . substr ( %any% , %num% )"))
|
|
{
|
|
size_t clen = MathLib::toLongNumber(tok->tokAt(8)->str());
|
|
size_t slen = Token::getStrLength(tok);
|
|
if (clen != slen)
|
|
{
|
|
incorrectStringCompareError(tok->next(), "substr", tok->str(), tok->tokAt(8)->str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// check for duplicate expressions in if statements
|
|
// if (a) { } else if (a) { }
|
|
//-----------------------------------------------------------------------------
|
|
|
|
static const std::string stringifyTokens(const Token *start, const Token *end)
|
|
{
|
|
const Token *tok = start;
|
|
std::string stringified;
|
|
|
|
if (tok->isUnsigned())
|
|
stringified.append("unsigned ");
|
|
else if (tok->isSigned())
|
|
stringified.append("signed ");
|
|
|
|
if (tok->isLong())
|
|
stringified.append("long ");
|
|
|
|
stringified.append(tok->str());
|
|
|
|
while (tok && tok->next() && tok != end)
|
|
{
|
|
if (tok->isUnsigned())
|
|
stringified.append("unsigned ");
|
|
else if (tok->isSigned())
|
|
stringified.append("signed ");
|
|
|
|
if (tok->isLong())
|
|
stringified.append("long ");
|
|
|
|
tok = tok->next();
|
|
stringified.append(" ");
|
|
stringified.append(tok->str());
|
|
}
|
|
|
|
return stringified;
|
|
}
|
|
|
|
static bool expressionHasSideEffects(const Token *first, const Token *last)
|
|
{
|
|
for (const Token *tok = first; tok != last->next(); tok = tok->next())
|
|
{
|
|
// check for assignment
|
|
if (tok->isAssignmentOp())
|
|
return true;
|
|
|
|
// check for inc/dec
|
|
else if (Token::Match(tok, "++|--"))
|
|
return true;
|
|
|
|
// check for function call
|
|
else if (Token::Match(tok, "%var% (") &&
|
|
!(Token::Match(tok, "c_str|string") || tok->isStandardType()))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void CheckOther::checkDuplicateIf()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
// check all the code in the function for if (...) and else if (...) statements
|
|
for (const Token *tok = scope->classStart; tok && tok != scope->classStart->link(); tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "if (") && tok->strAt(-1) != "else" &&
|
|
Token::Match(tok->next()->link(), ") {"))
|
|
{
|
|
std::map<std::string, const Token*> expressionMap;
|
|
|
|
// get the expression from the token stream
|
|
std::string expression = stringifyTokens(tok->tokAt(2), tok->next()->link()->previous());
|
|
|
|
// save the expression and its location
|
|
expressionMap.insert(std::make_pair(expression, tok));
|
|
|
|
// find the next else if (...) statement
|
|
const Token *tok1 = tok->next()->link()->next()->link();
|
|
|
|
// check all the else if (...) statements
|
|
while (Token::Match(tok1, "} else if (") &&
|
|
Token::Match(tok1->tokAt(3)->link(), ") {"))
|
|
{
|
|
// get the expression from the token stream
|
|
expression = stringifyTokens(tok1->tokAt(4), tok1->tokAt(3)->link()->previous());
|
|
|
|
// try to look up the expression to check for duplicates
|
|
std::map<std::string, const Token *>::iterator it = expressionMap.find(expression);
|
|
|
|
// found a duplicate
|
|
if (it != expressionMap.end())
|
|
{
|
|
// check for expressions that have side effects and ignore them
|
|
if (!expressionHasSideEffects(tok1->tokAt(4), tok1->tokAt(3)->link()->previous()))
|
|
duplicateIfError(it->second, tok1->next());
|
|
}
|
|
|
|
// not a duplicate expression so save it and its location
|
|
else
|
|
expressionMap.insert(std::make_pair(expression, tok1->next()));
|
|
|
|
// find the next else if (...) statement
|
|
tok1 = tok1->tokAt(3)->link()->next()->link();
|
|
}
|
|
|
|
tok = tok->next()->link()->next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::duplicateIfError(const Token *tok1, const Token *tok2)
|
|
{
|
|
std::list<const Token *> toks;
|
|
toks.push_back(tok2);
|
|
toks.push_back(tok1);
|
|
|
|
reportError(toks, Severity::style, "duplicateIf", "Found duplicate if expressions.\n"
|
|
"Finding the same expression more than once is suspicious and might indicate "
|
|
"a cut and paste or logic error. Please examine this code carefully to determine "
|
|
"if it is correct.");
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// check for duplicate code in if and else branches
|
|
// if (a) { b = true; } else { b = true; }
|
|
//-----------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkDuplicateBranch()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
// check all the code in the function for if (..) else
|
|
for (const Token *tok = scope->classStart; tok && tok != scope->classStart->link(); tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "if (") && tok->strAt(-1) != "else" &&
|
|
Token::Match(tok->next()->link(), ") {") &&
|
|
Token::Match(tok->next()->link()->next()->link(), "} else {"))
|
|
{
|
|
// save if branch code
|
|
std::string branch1 = stringifyTokens(tok->next()->link()->tokAt(2), tok->next()->link()->next()->link()->previous());
|
|
|
|
// find else branch
|
|
const Token *tok1 = tok->next()->link()->next()->link();
|
|
|
|
// save else branch code
|
|
std::string branch2 = stringifyTokens(tok1->tokAt(3), tok1->tokAt(2)->link()->previous());
|
|
|
|
// check for duplicates
|
|
if (branch1 == branch2)
|
|
duplicateBranchError(tok, tok1->tokAt(2));
|
|
|
|
tok = tok->next()->link()->next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::duplicateBranchError(const Token *tok1, const Token *tok2)
|
|
{
|
|
std::list<const Token *> toks;
|
|
toks.push_back(tok2);
|
|
toks.push_back(tok1);
|
|
|
|
reportError(toks, Severity::style, "duplicateBranch", "Found duplicate branches for if and else.\n"
|
|
"Finding the same code for an if branch and an else branch is suspicious and "
|
|
"might indicate a cut and paste or logic error. Please examine this code "
|
|
"carefully to determine if it is correct.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// check for the same expression on both sides of an operator
|
|
// (x == x), (x && x), (x || x)
|
|
// (x.y == x.y), (x.y && x.y), (x.y || x.y)
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkDuplicateExpression()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
// Parse all executing scopes..
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
|
|
std::list<Scope>::const_iterator scope;
|
|
|
|
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope)
|
|
{
|
|
// only check functions
|
|
if (scope->type != Scope::eFunction)
|
|
continue;
|
|
|
|
for (const Token *tok = scope->classStart; tok && tok != scope->classStart->link(); tok = tok->next())
|
|
{
|
|
if (Token::Match(tok, "(|&&|%oror% %var% &&|%oror%|==|!=|<=|>=|<|>|-|%or% %var% )|&&|%oror%") &&
|
|
tok->strAt(1) == tok->strAt(3))
|
|
{
|
|
// float == float and float != float are valid NaN checks
|
|
if (Token::Match(tok->tokAt(2), "==|!=") && tok->next()->varId())
|
|
{
|
|
const Variable * var = symbolDatabase->getVariableFromVarId(tok->next()->varId());
|
|
if (var && var->typeStartToken() == var->typeEndToken())
|
|
{
|
|
if (Token::Match(var->typeStartToken(), "float|double"))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
duplicateExpressionError(tok->next(), tok->tokAt(3), tok->strAt(2));
|
|
}
|
|
else if (Token::Match(tok, "(|&&|%oror% %var% . %var% &&|%oror%|==|!=|<=|>=|<|>|-|%or% %var% . %var% )|&&|%oror%") &&
|
|
tok->strAt(1) == tok->strAt(5) && tok->strAt(3) == tok->strAt(7))
|
|
{
|
|
duplicateExpressionError(tok->next(), tok->tokAt(6), tok->strAt(4));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::duplicateExpressionError(const Token *tok1, const Token *tok2, const std::string &op)
|
|
{
|
|
std::list<const Token *> toks;
|
|
toks.push_back(tok2);
|
|
toks.push_back(tok1);
|
|
|
|
reportError(toks, Severity::style, "duplicateExpression", "Same expression on both sides of \'" + op + "\'.\n"
|
|
"Finding the same expression on both sides of an operator is suspicious and might "
|
|
"indicate a cut and paste or logic error. Please examine this code carefully to "
|
|
"determine if it is correct.");
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// Check for string comparison involving two static strings.
|
|
// if(strcmp("00FF00","00FF00")==0) // <- statement is always true
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckOther::checkAlwaysTrueOrFalseStringCompare()
|
|
{
|
|
if (!_settings->_checkCodingStyle)
|
|
return;
|
|
|
|
const char pattern1[] = "strcmp|stricmp|strcmpi|strcasecmp|wcscmp ( %str% , %str% )";
|
|
const char pattern2[] = "QString :: compare ( %str% , %str% )";
|
|
|
|
const Token *tok = _tokenizer->tokens();
|
|
while (tok && (tok = Token::findmatch(tok, pattern1)) != NULL)
|
|
{
|
|
alwaysTrueFalseStringCompare(tok, tok->strAt(2), tok->strAt(4));
|
|
tok = tok->tokAt(5);
|
|
}
|
|
|
|
tok = _tokenizer->tokens();
|
|
while (tok && (tok = Token::findmatch(tok, pattern2)) != NULL)
|
|
{
|
|
alwaysTrueFalseStringCompare(tok, tok->strAt(4), tok->strAt(6));
|
|
tok = tok->tokAt(7);
|
|
}
|
|
}
|
|
|
|
void CheckOther::alwaysTrueFalseStringCompare(const Token *tok, const std::string& str1, const std::string& str2)
|
|
{
|
|
const size_t stringLen = 10;
|
|
const std::string string1 = (str1.size() < stringLen) ? str1 : (str1.substr(0, stringLen-2) + "..");
|
|
const std::string string2 = (str2.size() < stringLen) ? str2 : (str2.substr(0, stringLen-2) + "..");
|
|
|
|
if (str1 == str2)
|
|
{
|
|
reportError(tok, Severity::warning, "staticStringCompare",
|
|
"Comparison of always identical static strings.\n"
|
|
"The compared strings, '" + string1 + "' and '" + string2 + "', are always identical. "
|
|
"If the purpose is to compare these two strings, the comparison is unnecessary. "
|
|
"If the strings are supposed to be different, then there is a bug somewhere.");
|
|
}
|
|
else
|
|
{
|
|
reportError(tok, Severity::performance, "staticStringCompare",
|
|
"Unnecessary comparison of static strings.\n"
|
|
"The compared strings, '" + string1 + "' and '" + string2 + "', are static and always different. "
|
|
"If the purpose is to compare these two strings, the comparison is unnecessary.");
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
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 a parameter and as a destination in "
|
|
"s[n]printf(). The origin and destination buffers 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::Match(tok, "sizeof (| sizeof"))
|
|
{
|
|
sizeofsizeofError(tok);
|
|
tok = tok->next();
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckOther::sizeofsizeofError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"sizeofsizeof", "Calling sizeof for 'sizeof'.\n"
|
|
"Calling sizeof for 'sizeof looks like a 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::switchCaseFallThrough(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style,
|
|
"switchCaseFallThrough", "Switch falls through case without comment");
|
|
}
|
|
|
|
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"
|
|
"Variable '" + varname + "' is modified insert assert statement. "
|
|
"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.");
|
|
reportError(tok, Severity::warning, "memsetZeroBytes", summary + "\n" + verbose);
|
|
}
|
|
|
|
void CheckOther::incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string, const std::string &len)
|
|
{
|
|
reportError(tok, Severity::warning, "incorrectStringCompare", "String literal " + string + " doesn't match length argument for " + func + "(" + len + ").");
|
|
}
|
|
|
|
void CheckOther::comparisonOfBoolWithIntError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::warning, "comparisonOfBoolWithInt",
|
|
"Comparison of a boolean with a non-zero integer\n"
|
|
"The expression \"!" + varname + "\" is of type 'bool' but is compared against a non-zero 'int'.");
|
|
}
|