2468 lines
107 KiB
C++
2468 lines
107 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2020 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "checkstl.h"
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#include "library.h"
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#include "mathlib.h"
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#include "settings.h"
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#include "standards.h"
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#include "symboldatabase.h"
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#include "token.h"
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#include "utils.h"
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#include "astutils.h"
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#include "pathanalysis.h"
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#include "valueflow.h"
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#include <cstddef>
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#include <list>
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#include <map>
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#include <set>
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#include <sstream>
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#include <utility>
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// Register this check class (by creating a static instance of it)
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namespace {
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CheckStl instance;
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}
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// CWE IDs used:
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static const struct CWE CWE398(398U); // Indicator of Poor Code Quality
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static const struct CWE CWE597(597U); // Use of Wrong Operator in String Comparison
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static const struct CWE CWE628(628U); // Function Call with Incorrectly Specified Arguments
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static const struct CWE CWE664(664U); // Improper Control of a Resource Through its Lifetime
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static const struct CWE CWE667(667U); // Improper Locking
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static const struct CWE CWE704(704U); // Incorrect Type Conversion or Cast
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static const struct CWE CWE762(762U); // Mismatched Memory Management Routines
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static const struct CWE CWE786(786U); // Access of Memory Location Before Start of Buffer
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static const struct CWE CWE788(788U); // Access of Memory Location After End of Buffer
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static const struct CWE CWE825(825U); // Expired Pointer Dereference
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static const struct CWE CWE833(833U); // Deadlock
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static const struct CWE CWE834(834U); // Excessive Iteration
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void CheckStl::outOfBounds()
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{
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for (const Scope *function : mTokenizer->getSymbolDatabase()->functionScopes) {
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for (const Token *tok = function->bodyStart; tok != function->bodyEnd; tok = tok->next()) {
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const Library::Container *container = getLibraryContainer(tok);
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if (!container)
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continue;
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const Token * parent = astParentSkipParens(tok);
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for (const ValueFlow::Value &value : tok->values()) {
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if (!value.isContainerSizeValue())
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continue;
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if (value.isImpossible())
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continue;
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if (value.isInconclusive() && !mSettings->inconclusive)
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continue;
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if (!value.errorSeverity() && !mSettings->isEnabled(Settings::WARNING))
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continue;
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if (value.intvalue == 0 && Token::Match(parent, ". %name% (") && container->getYield(parent->strAt(1)) == Library::Container::Yield::ITEM) {
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outOfBoundsError(parent->tokAt(2), tok->expressionString(), &value, parent->strAt(1), nullptr);
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continue;
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}
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if (Token::Match(tok, "%name% . %name% (") && container->getYield(tok->strAt(2)) == Library::Container::Yield::START_ITERATOR) {
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const Token *fparent = tok->tokAt(3)->astParent();
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const Token *other = nullptr;
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if (Token::simpleMatch(fparent, "+") && fparent->astOperand1() == tok->tokAt(3))
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other = fparent->astOperand2();
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else if (Token::simpleMatch(fparent, "+") && fparent->astOperand2() == tok->tokAt(3))
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other = fparent->astOperand1();
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if (other && other->hasKnownIntValue() && other->getKnownIntValue() > value.intvalue) {
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outOfBoundsError(fparent, tok->expressionString(), &value, other->expressionString(), &other->values().back());
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continue;
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} else if (other && !other->hasKnownIntValue() && value.isKnown() && value.intvalue==0) {
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outOfBoundsError(fparent, tok->expressionString(), &value, other->expressionString(), nullptr);
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continue;
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}
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}
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if (!container->arrayLike_indexOp && !container->stdStringLike)
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continue;
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if (value.intvalue == 0 && Token::Match(parent, "[") && tok == parent->astOperand1()) {
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outOfBoundsError(parent, tok->expressionString(), &value, "", nullptr);
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continue;
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}
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if (container->arrayLike_indexOp && Token::Match(parent, "[")) {
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const ValueFlow::Value *indexValue = parent->astOperand2() ? parent->astOperand2()->getMaxValue(false) : nullptr;
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if (indexValue && indexValue->intvalue >= value.intvalue) {
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outOfBoundsError(parent, tok->expressionString(), &value, parent->astOperand2()->expressionString(), indexValue);
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continue;
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}
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if (mSettings->isEnabled(Settings::WARNING)) {
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indexValue = parent->astOperand2() ? parent->astOperand2()->getMaxValue(true) : nullptr;
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if (indexValue && indexValue->intvalue >= value.intvalue) {
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outOfBoundsError(parent, tok->expressionString(), &value, parent->astOperand2()->expressionString(), indexValue);
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continue;
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}
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}
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}
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}
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}
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}
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}
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void CheckStl::outOfBoundsError(const Token *tok, const std::string &containerName, const ValueFlow::Value *containerSize, const std::string &index, const ValueFlow::Value *indexValue)
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{
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// Do not warn if both the container size and index value are possible
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if (containerSize && indexValue && containerSize->isPossible() && indexValue->isPossible())
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return;
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const std::string expression = tok ? tok->expressionString() : (containerName+"[x]");
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std::string errmsg;
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if (!containerSize)
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errmsg = "Out of bounds access in expression '" + expression + "'";
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else if (containerSize->intvalue == 0) {
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if (containerSize->condition)
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errmsg = ValueFlow::eitherTheConditionIsRedundant(containerSize->condition) + " or expression '" + expression + "' cause access out of bounds.";
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else if (indexValue == nullptr && !index.empty())
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errmsg = "Out of bounds access in expression '" + expression + "' because '$symbol' is empty and '" + index + "' may be non-zero.";
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else
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errmsg = "Out of bounds access in expression '" + expression + "' because '$symbol' is empty.";
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} else if (indexValue) {
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if (containerSize->condition)
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errmsg = ValueFlow::eitherTheConditionIsRedundant(containerSize->condition) + " or $symbol size can be " + MathLib::toString(containerSize->intvalue) + ". Expression '" + expression + "' cause access out of bounds.";
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else if (indexValue->condition)
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errmsg = ValueFlow::eitherTheConditionIsRedundant(indexValue->condition) + " or '" + index + "' can have the value " + MathLib::toString(indexValue->intvalue) + ". Expression '" + expression + "' cause access out of bounds.";
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else
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errmsg = "Out of bounds access in '" + expression + "', if '$symbol' size is " + MathLib::toString(containerSize->intvalue) + " and '" + index + "' is " + MathLib::toString(indexValue->intvalue);
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} else {
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// should not happen
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return;
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}
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ErrorPath errorPath;
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if (!indexValue)
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errorPath = getErrorPath(tok, containerSize, "Access out of bounds");
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else {
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ErrorPath errorPath1 = getErrorPath(tok, containerSize, "Access out of bounds");
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ErrorPath errorPath2 = getErrorPath(tok, indexValue, "Access out of bounds");
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if (errorPath1.size() <= 1)
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errorPath = errorPath2;
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else if (errorPath2.size() <= 1)
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errorPath = errorPath1;
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else {
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errorPath = errorPath1;
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errorPath.splice(errorPath.end(), errorPath2);
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}
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}
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reportError(errorPath,
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(containerSize && !containerSize->errorSeverity()) || (indexValue && !indexValue->errorSeverity()) ? Severity::warning : Severity::error,
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"containerOutOfBounds",
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"$symbol:" + containerName +"\n" + errmsg,
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CWE398,
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(containerSize && containerSize->isInconclusive()) || (indexValue && indexValue->isInconclusive()));
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}
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bool CheckStl::isContainerSize(const Token *containerToken, const Token *expr) const
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{
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if (!Token::simpleMatch(expr, "( )"))
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return false;
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if (!Token::Match(expr->astOperand1(), ". %name% ("))
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return false;
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if (!isSameExpression(mTokenizer->isCPP(), false, containerToken, expr->astOperand1()->astOperand1(), mSettings->library, false, false))
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return false;
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return containerToken->valueType()->container->getYield(expr->previous()->str()) == Library::Container::Yield::SIZE;
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}
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bool CheckStl::isContainerSizeGE(const Token * containerToken, const Token *expr) const
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{
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if (!expr)
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return false;
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if (isContainerSize(containerToken, expr))
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return true;
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if (expr->str() == "*") {
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const Token *mul;
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if (isContainerSize(containerToken, expr->astOperand1()))
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mul = expr->astOperand2();
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else if (isContainerSize(containerToken, expr->astOperand2()))
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mul = expr->astOperand1();
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else
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return false;
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return mul && (!mul->hasKnownIntValue() || mul->values().front().intvalue != 0);
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}
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if (expr->str() == "+") {
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const Token *op;
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if (isContainerSize(containerToken, expr->astOperand1()))
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op = expr->astOperand2();
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else if (isContainerSize(containerToken, expr->astOperand2()))
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op = expr->astOperand1();
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else
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return false;
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return op && op->getValueGE(0, mSettings);
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}
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return false;
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}
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void CheckStl::outOfBoundsIndexExpression()
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{
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for (const Scope *function : mTokenizer->getSymbolDatabase()->functionScopes) {
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for (const Token *tok = function->bodyStart; tok != function->bodyEnd; tok = tok->next()) {
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if (!tok->isName() || !tok->valueType())
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continue;
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const Library::Container *container = tok->valueType()->container;
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if (!container)
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continue;
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if (!container->arrayLike_indexOp && !container->stdStringLike)
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continue;
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if (!Token::Match(tok, "%name% ["))
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continue;
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if (isContainerSizeGE(tok, tok->next()->astOperand2()))
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outOfBoundsIndexExpressionError(tok, tok->next()->astOperand2());
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}
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}
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}
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void CheckStl::outOfBoundsIndexExpressionError(const Token *tok, const Token *index)
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{
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const std::string varname = tok ? tok->str() : std::string("var");
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const std::string i = index ? index->expressionString() : std::string(varname + ".size()");
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std::string errmsg = "Out of bounds access of $symbol, index '" + i + "' is out of bounds.";
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reportError(tok,
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Severity::error,
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"containerOutOfBoundsIndexExpression",
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"$symbol:" + varname +"\n" + errmsg,
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CWE398,
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false);
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}
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// Error message for bad iterator usage..
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void CheckStl::invalidIteratorError(const Token *tok, const std::string &iteratorName)
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{
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reportError(tok, Severity::error, "invalidIterator1", "$symbol:"+iteratorName+"\nInvalid iterator: $symbol", CWE664, false);
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}
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void CheckStl::iteratorsError(const Token* tok, const std::string& containerName1, const std::string& containerName2)
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{
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reportError(tok, Severity::error, "iterators1",
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"$symbol:" + containerName1 + "\n"
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"$symbol:" + containerName2 + "\n"
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"Same iterator is used with different containers '" + containerName1 + "' and '" + containerName2 + "'.", CWE664, false);
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}
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void CheckStl::iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName1, const std::string& containerName2)
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{
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std::list<const Token*> callstack = { tok, containerTok };
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reportError(callstack, Severity::error, "iterators2",
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"$symbol:" + containerName1 + "\n"
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"$symbol:" + containerName2 + "\n"
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"Same iterator is used with different containers '" + containerName1 + "' and '" + containerName2 + "'.", CWE664, false);
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}
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void CheckStl::iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName)
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{
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std::list<const Token*> callstack = { tok, containerTok };
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reportError(callstack, Severity::error, "iterators3",
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"$symbol:" + containerName + "\n"
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"Same iterator is used with containers '" + containerName + "' that are defined in different scopes.", CWE664, false);
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}
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// Error message used when dereferencing an iterator that has been erased..
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void CheckStl::dereferenceErasedError(const Token *erased, const Token* deref, const std::string &itername, bool inconclusive)
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{
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if (erased) {
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std::list<const Token*> callstack = { deref, erased };
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reportError(callstack, Severity::error, "eraseDereference",
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"$symbol:" + itername + "\n"
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"Iterator '$symbol' used after element has been erased.\n"
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"The iterator '$symbol' is invalid after the element it pointed to has been erased. "
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"Dereferencing or comparing it with another iterator is invalid operation.", CWE664, inconclusive);
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} else {
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reportError(deref, Severity::error, "eraseDereference",
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"$symbol:" + itername + "\n"
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"Invalid iterator '$symbol' used.\n"
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"The iterator '$symbol' is invalid before being assigned. "
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"Dereferencing or comparing it with another iterator is invalid operation.", CWE664, inconclusive);
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}
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}
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static const Token *skipMembers(const Token *tok)
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{
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while (Token::Match(tok, "%name% ."))
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tok = tok->tokAt(2);
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return tok;
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}
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static bool isIterator(const Variable *var, bool& inconclusiveType)
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{
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// Check that its an iterator
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if (!var || !var->isLocal() || !Token::Match(var->typeEndToken(), "iterator|const_iterator|reverse_iterator|const_reverse_iterator|auto"))
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return false;
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inconclusiveType = false;
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if (var->typeEndToken()->str() == "auto")
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return (var->nameToken()->valueType() && var->nameToken()->valueType()->type == ValueType::Type::ITERATOR);
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if (var->type()) { // If it is defined, ensure that it is defined like an iterator
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// look for operator* and operator++
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const Function* end = var->type()->getFunction("operator*");
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const Function* incOperator = var->type()->getFunction("operator++");
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if (!end || end->argCount() > 0 || !incOperator) {
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return false;
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} else {
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inconclusiveType = true; // heuristics only
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}
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}
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return true;
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}
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static std::string getContainerName(const Token *containerToken)
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{
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if (!containerToken)
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return std::string();
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std::string ret(containerToken->str());
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for (const Token *nametok = containerToken; nametok; nametok = nametok->tokAt(-2)) {
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if (!Token::Match(nametok->tokAt(-2), "%name% ."))
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break;
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ret = nametok->strAt(-2) + '.' + ret;
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}
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return ret;
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}
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enum OperandPosition {
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Left,
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Right
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};
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static bool isVector(const Token* tok)
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{
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if (!tok)
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return false;
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const Variable *var = tok->variable();
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const Token *decltok = var ? var->typeStartToken() : nullptr;
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return Token::simpleMatch(decltok, "std :: vector");
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}
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void CheckStl::iterators()
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{
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const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
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// Filling map of iterators id and their scope begin
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std::map<int, const Token*> iteratorScopeBeginInfo;
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for (const Variable* var : symbolDatabase->variableList()) {
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bool inconclusiveType=false;
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if (!isIterator(var, inconclusiveType))
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continue;
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const int iteratorId = var->declarationId();
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if (iteratorId != 0)
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iteratorScopeBeginInfo[iteratorId] = var->nameToken();
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}
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for (const Variable* var : symbolDatabase->variableList()) {
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bool inconclusiveType=false;
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if (!isIterator(var, inconclusiveType))
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continue;
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if (inconclusiveType && !mSettings->inconclusive)
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continue;
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const int iteratorId = var->declarationId();
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// the validIterator flag says if the iterator has a valid value or not
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bool validIterator = Token::Match(var->nameToken()->next(), "[(=:{]");
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const Scope* invalidationScope = nullptr;
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// The container this iterator can be used with
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const Token* containerToken = nullptr;
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const Scope* containerAssignScope = nullptr;
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// When "validatingToken" is reached the validIterator is set to true
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const Token* validatingToken = nullptr;
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const Token* eraseToken = nullptr;
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// Scan through the rest of the code and see if the iterator is
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// used against other containers.
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for (const Token *tok2 = var->nameToken(); tok2 && tok2 != var->scope()->bodyEnd; tok2 = tok2->next()) {
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if (invalidationScope && tok2 == invalidationScope->bodyEnd)
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validIterator = true; // Assume that the iterator becomes valid again
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if (containerAssignScope && tok2 == containerAssignScope->bodyEnd)
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containerToken = nullptr; // We don't know which containers might be used with the iterator
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if (tok2 == validatingToken) {
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validIterator = true;
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eraseToken = nullptr;
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invalidationScope = nullptr;
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}
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// Is the iterator used in a insert/erase operation?
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if (Token::Match(tok2, "%name% . insert|erase ( *| %varid% )|,", iteratorId) && !isVector(tok2)) {
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const Token* itTok = tok2->tokAt(4);
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if (itTok->str() == "*") {
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if (tok2->strAt(2) == "insert")
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continue;
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itTok = itTok->next();
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}
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// It is bad to insert/erase an invalid iterator
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if (!validIterator)
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invalidIteratorError(tok2, itTok->str());
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// If insert/erase is used on different container then
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// report an error
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if (containerToken && tok2->varId() != containerToken->varId()) {
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// skip error message if container is a set..
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const Variable *variableInfo = tok2->variable();
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const Token *decltok = variableInfo ? variableInfo->typeStartToken() : nullptr;
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if (Token::simpleMatch(decltok, "std :: set"))
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continue; // No warning
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// skip error message if the iterator is erased/inserted by value
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if (itTok->previous()->str() == "*")
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continue;
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// inserting iterator range..
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if (tok2->strAt(2) == "insert") {
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const Token *par2 = itTok->nextArgument();
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if (!par2 || par2->nextArgument())
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continue;
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while (par2->str() != ")") {
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if (par2->varId() == containerToken->varId())
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break;
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bool inconclusiveType2=false;
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if (isIterator(par2->variable(), inconclusiveType2))
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break; // TODO: check if iterator points at same container
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if (par2->str() == "(")
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par2 = par2->link();
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par2 = par2->next();
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}
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if (par2->str() != ")")
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continue;
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}
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// Not different containers if a reference is used..
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if (containerToken && containerToken->variable() && containerToken->variable()->isReference()) {
|
|
const Token *nameToken = containerToken->variable()->nameToken();
|
|
if (Token::Match(nameToken, "%name% =")) {
|
|
const Token *name1 = nameToken->tokAt(2);
|
|
const Token *name2 = tok2;
|
|
while (Token::Match(name1, "%name%|.|::") && name2 && name1->str() == name2->str()) {
|
|
name1 = name1->next();
|
|
name2 = name2->next();
|
|
}
|
|
if (!Token::simpleMatch(name1, ";") || !Token::Match(name2, "[;,()=]"))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Show error message, mismatching iterator is used.
|
|
iteratorsError(tok2, getContainerName(containerToken), getContainerName(tok2));
|
|
}
|
|
|
|
// invalidate the iterator if it is erased
|
|
else if (tok2->strAt(2) == "erase" && (tok2->strAt(4) != "*" || (containerToken && tok2->varId() == containerToken->varId()))) {
|
|
validIterator = false;
|
|
eraseToken = tok2;
|
|
invalidationScope = tok2->scope();
|
|
}
|
|
|
|
// skip the operation
|
|
tok2 = itTok->next();
|
|
}
|
|
|
|
// it = foo.erase(..
|
|
// taking the result of an erase is ok
|
|
else if (Token::Match(tok2, "%varid% = %name% .", iteratorId) &&
|
|
Token::simpleMatch(skipMembers(tok2->tokAt(2)), "erase (")) {
|
|
// the returned iterator is valid
|
|
validatingToken = skipMembers(tok2->tokAt(2))->linkAt(1);
|
|
tok2 = validatingToken->link();
|
|
}
|
|
|
|
// Reassign the iterator
|
|
else if (Token::Match(tok2, "%varid% = %name% .", iteratorId) &&
|
|
Token::Match(skipMembers(tok2->tokAt(2)), "begin|rbegin|cbegin|crbegin|find (")) {
|
|
validatingToken = skipMembers(tok2->tokAt(2))->linkAt(1);
|
|
containerToken = skipMembers(tok2->tokAt(2))->tokAt(-2);
|
|
if (containerToken->varId() == 0 || Token::simpleMatch(validatingToken, ") ."))
|
|
containerToken = nullptr;
|
|
containerAssignScope = tok2->scope();
|
|
|
|
// skip ahead
|
|
tok2 = validatingToken->link();
|
|
}
|
|
|
|
// Reassign the iterator
|
|
else if (Token::Match(tok2, "%varid% =", iteratorId)) {
|
|
break;
|
|
}
|
|
|
|
// Passing iterator to function. Iterator might be initialized
|
|
else if (Token::Match(tok2, "%varid% ,|)", iteratorId)) {
|
|
validIterator = true;
|
|
}
|
|
|
|
// Dereferencing invalid iterator?
|
|
else if (!validIterator && Token::Match(tok2, "* %varid%", iteratorId)) {
|
|
dereferenceErasedError(eraseToken, tok2, tok2->strAt(1), inconclusiveType);
|
|
tok2 = tok2->next();
|
|
} else if (!validIterator && Token::Match(tok2, "%varid% . %name%", iteratorId)) {
|
|
dereferenceErasedError(eraseToken, tok2, tok2->str(), inconclusiveType);
|
|
tok2 = tok2->tokAt(2);
|
|
}
|
|
|
|
// bailout handling. Assume that the iterator becomes valid if we see return/break.
|
|
// TODO: better handling
|
|
else if (tok2->scope() == invalidationScope && Token::Match(tok2, "return|break|continue")) {
|
|
validatingToken = Token::findsimplematch(tok2->next(), ";");
|
|
}
|
|
|
|
// bailout handling. Assume that the iterator becomes valid if we see else.
|
|
// TODO: better handling
|
|
else if (tok2->str() == "else") {
|
|
validIterator = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::mismatchingContainerIteratorError(const Token* tok, const Token* iterTok)
|
|
{
|
|
const std::string container(tok ? tok->expressionString() : std::string("v1"));
|
|
const std::string iter(iterTok ? iterTok->expressionString() : std::string("it"));
|
|
reportError(tok,
|
|
Severity::error,
|
|
"mismatchingContainerIterator",
|
|
"Iterator '" + iter + "' from different container '" + container + "' are used together.",
|
|
CWE664,
|
|
false);
|
|
}
|
|
|
|
// Error message for bad iterator usage..
|
|
void CheckStl::mismatchingContainersError(const Token* tok1, const Token* tok2)
|
|
{
|
|
const std::string expr1(tok1 ? tok1->expressionString() : std::string("v1"));
|
|
const std::string expr2(tok2 ? tok2->expressionString() : std::string("v2"));
|
|
reportError(tok1,
|
|
Severity::error,
|
|
"mismatchingContainers",
|
|
"Iterators of different containers '" + expr1 + "' and '" + expr2 + "' are used together.",
|
|
CWE664,
|
|
false);
|
|
}
|
|
|
|
void CheckStl::mismatchingContainerExpressionError(const Token *tok1, const Token *tok2)
|
|
{
|
|
const std::string expr1(tok1 ? tok1->expressionString() : std::string("v1"));
|
|
const std::string expr2(tok2 ? tok2->expressionString() : std::string("v2"));
|
|
reportError(tok1, Severity::warning, "mismatchingContainerExpression",
|
|
"Iterators to containers from different expressions '" +
|
|
expr1 + "' and '" + expr2 + "' are used together.", CWE664, false);
|
|
}
|
|
|
|
void CheckStl::sameIteratorExpressionError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "sameIteratorExpression", "Same iterators expression are used for algorithm.", CWE664, false);
|
|
}
|
|
|
|
static const std::set<std::string> algorithm2 = { // func(begin1, end1
|
|
"binary_search", "copy", "copy_if", "equal_range"
|
|
, "generate", "is_heap", "is_heap_until", "is_partitioned"
|
|
, "is_permutation", "is_sorted", "is_sorted_until", "lower_bound", "make_heap", "max_element", "minmax_element"
|
|
, "min_element", "mismatch", "move", "move_backward", "next_permutation", "partition", "partition_copy"
|
|
, "partition_point", "pop_heap", "prev_permutation", "push_heap", "random_shuffle", "remove", "remove_copy"
|
|
, "remove_copy_if", "remove_if", "replace", "replace_copy", "replace_copy_if", "replace_if", "reverse", "reverse_copy"
|
|
, "shuffle", "sort", "sort_heap", "stable_partition", "stable_sort", "swap_ranges", "transform", "unique"
|
|
, "unique_copy", "upper_bound", "string", "wstring", "u16string", "u32string"
|
|
};
|
|
static const std::set<std::string> algorithm22 = { // func(begin1, end1, begin2, end2
|
|
"includes", "lexicographical_compare", "merge", "partial_sort_copy"
|
|
, "set_difference", "set_intersection", "set_symmetric_difference", "set_union"
|
|
};
|
|
static const std::set<std::string> algorithm1x1 = { // func(begin1, x, end1
|
|
"nth_element", "partial_sort", "rotate", "rotate_copy"
|
|
};
|
|
|
|
static const std::string iteratorBeginFuncPattern = "begin|cbegin|rbegin|crbegin";
|
|
static const std::string iteratorEndFuncPattern = "end|cend|rend|crend";
|
|
|
|
static const std::string pattern1x1_1 = "%name% . " + iteratorBeginFuncPattern + " ( ) , ";
|
|
static const std::string pattern1x1_2 = "%name% . " + iteratorEndFuncPattern + " ( ) ,|)";
|
|
static const std::string pattern2 = pattern1x1_1 + pattern1x1_2;
|
|
|
|
static const Token * getIteratorExpression(const Token * tok)
|
|
{
|
|
if (!tok)
|
|
return nullptr;
|
|
if (tok->isUnaryOp("*"))
|
|
return nullptr;
|
|
if (!tok->isName()) {
|
|
const Token *iter1 = getIteratorExpression(tok->astOperand1());
|
|
if (iter1)
|
|
return iter1;
|
|
if (tok->str() == "(")
|
|
return nullptr;
|
|
const Token *iter2 = getIteratorExpression(tok->astOperand2());
|
|
if (iter2)
|
|
return iter2;
|
|
} else if (Token::Match(tok, "begin|cbegin|rbegin|crbegin|end|cend|rend|crend (")) {
|
|
if (Token::Match(tok->previous(), ". %name% ( ) !!."))
|
|
return tok->previous()->astOperand1();
|
|
if (!Token::simpleMatch(tok->previous(), ".") && Token::Match(tok, "%name% ( !!)") && !Token::simpleMatch(tok->linkAt(1), ") ."))
|
|
return tok->next()->astOperand2();
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
bool CheckStl::checkIteratorPair(const Token* tok1, const Token* tok2)
|
|
{
|
|
if (!tok1)
|
|
return false;
|
|
if (!tok2)
|
|
return false;
|
|
ValueFlow::Value val1 = getLifetimeObjValue(tok1);
|
|
ValueFlow::Value val2 = getLifetimeObjValue(tok2);
|
|
if (val1.tokvalue && val2.tokvalue && val1.lifetimeKind == val2.lifetimeKind) {
|
|
if (val1.lifetimeKind == ValueFlow::Value::LifetimeKind::Lambda)
|
|
return false;
|
|
if (tok1->astParent() == tok2->astParent() && Token::Match(tok1->astParent(), "%comp%|-")) {
|
|
if (val1.lifetimeKind == ValueFlow::Value::LifetimeKind::Address)
|
|
return false;
|
|
if (val1.lifetimeKind == ValueFlow::Value::LifetimeKind::Object &&
|
|
(!astIsContainer(val1.tokvalue) || !astIsContainer(val2.tokvalue)))
|
|
return false;
|
|
}
|
|
if (isSameExpression(true, false, val1.tokvalue, val2.tokvalue, mSettings->library, false, false))
|
|
return false;
|
|
if (val1.tokvalue->expressionString() == val2.tokvalue->expressionString())
|
|
iteratorsError(tok1, val1.tokvalue, val1.tokvalue->expressionString());
|
|
else
|
|
mismatchingContainersError(val1.tokvalue, val2.tokvalue);
|
|
return true;
|
|
}
|
|
|
|
const Token* iter1 = getIteratorExpression(tok1);
|
|
const Token* iter2 = getIteratorExpression(tok2);
|
|
if (iter1 && iter2 && !isSameExpression(true, false, iter1, iter2, mSettings->library, false, false)) {
|
|
mismatchingContainerExpressionError(iter1, iter2);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
struct ArgIteratorInfo {
|
|
const Token* tok;
|
|
const Library::ArgumentChecks::IteratorInfo* info;
|
|
};
|
|
|
|
void CheckStl::mismatchingContainers()
|
|
{
|
|
// Check if different containers are used in various calls of standard functions
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (Token::Match(tok, "%comp%|-")) {
|
|
if (checkIteratorPair(tok->astOperand1(), tok->astOperand2()))
|
|
continue;
|
|
}
|
|
if (!Token::Match(tok, "%name% ( !!)"))
|
|
continue;
|
|
const Token * const ftok = tok;
|
|
|
|
const std::vector<const Token *> args = getArguments(ftok);
|
|
if (args.size() < 2)
|
|
continue;
|
|
|
|
// Group args together by container
|
|
std::map<int, std::vector<ArgIteratorInfo>> containers;
|
|
for (int argnr = 1; argnr <= args.size(); ++argnr) {
|
|
const Library::ArgumentChecks::IteratorInfo *i = mSettings->library.getArgIteratorInfo(ftok, argnr);
|
|
if (!i)
|
|
continue;
|
|
const Token * const argTok = args[argnr - 1];
|
|
containers[i->container].push_back({argTok, i});
|
|
}
|
|
|
|
// Lambda is used to escape the nested loops
|
|
[&] {
|
|
for (const auto& p : containers)
|
|
{
|
|
const std::vector<ArgIteratorInfo>& cargs = p.second;
|
|
for (ArgIteratorInfo iter1 : cargs) {
|
|
for (ArgIteratorInfo iter2 : cargs) {
|
|
if (iter1.tok == iter2.tok)
|
|
continue;
|
|
if (iter1.info->first && iter2.info->last &&
|
|
isSameExpression(true, false, iter1.tok, iter2.tok, mSettings->library, false, false))
|
|
sameIteratorExpressionError(iter1.tok);
|
|
if (checkIteratorPair(iter1.tok, iter2.tok))
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}();
|
|
}
|
|
}
|
|
for (const Variable *var : symbolDatabase->variableList()) {
|
|
if (var && var->isStlStringType() && Token::Match(var->nameToken(), "%var% (") && Token::Match(var->nameToken()->tokAt(2), pattern2.c_str())) {
|
|
if (var->nameToken()->strAt(2) != var->nameToken()->strAt(8)) {
|
|
mismatchingContainersError(var->nameToken(), var->nameToken()->tokAt(2));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::mismatchingContainerIterator()
|
|
{
|
|
// Check if different containers are used in various calls of standard functions
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!astIsContainer(tok))
|
|
continue;
|
|
if (!Token::Match(tok, "%var% . %name% ( !!)"))
|
|
continue;
|
|
const Token * const ftok = tok->tokAt(2);
|
|
const std::vector<const Token *> args = getArguments(ftok);
|
|
|
|
const Library::Container * c = tok->valueType()->container;
|
|
Library::Container::Action action = c->getAction(tok->strAt(2));
|
|
const Token* iterTok = nullptr;
|
|
if (action == Library::Container::Action::INSERT && args.size() == 2) {
|
|
// Skip if iterator pair
|
|
if (astIsIterator(args.back()))
|
|
continue;
|
|
if (!astIsIterator(args.front()))
|
|
continue;
|
|
iterTok = args.front();
|
|
} else if (action == Library::Container::Action::ERASE) {
|
|
if (!astIsIterator(args.front()))
|
|
continue;
|
|
iterTok = args.front();
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
ValueFlow::Value val = getLifetimeObjValue(iterTok);
|
|
if (!val.tokvalue)
|
|
continue;
|
|
if (val.lifetimeKind != ValueFlow::Value::LifetimeKind::Iterator)
|
|
continue;
|
|
if (isSameExpression(true, false, tok, val.tokvalue, mSettings->library, false, false))
|
|
continue;
|
|
mismatchingContainerIteratorError(tok, iterTok);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isInvalidMethod(const Token * tok)
|
|
{
|
|
if (Token::Match(tok->next(), ". assign|clear|swap"))
|
|
return true;
|
|
if (Token::Match(tok->next(), "%assign%"))
|
|
return true;
|
|
if (const Library::Container * c = tok->valueType()->container) {
|
|
Library::Container::Action action = c->getAction(tok->strAt(2));
|
|
if (c->unstableErase) {
|
|
if (action == Library::Container::Action::ERASE)
|
|
return true;
|
|
}
|
|
if (c->unstableInsert) {
|
|
if (action == Library::Container::Action::RESIZE)
|
|
return true;
|
|
if (action == Library::Container::Action::CLEAR)
|
|
return true;
|
|
if (action == Library::Container::Action::PUSH)
|
|
return true;
|
|
if (action == Library::Container::Action::POP)
|
|
return true;
|
|
if (action == Library::Container::Action::INSERT)
|
|
return true;
|
|
if (action == Library::Container::Action::CHANGE)
|
|
return true;
|
|
if (action == Library::Container::Action::CHANGE_INTERNAL)
|
|
return true;
|
|
if (Token::Match(tok->next(), ". insert|emplace"))
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool isVariableDecl(const Token* tok)
|
|
{
|
|
if (!tok)
|
|
return false;
|
|
const Variable* var = tok->variable();
|
|
if (!var)
|
|
return false;
|
|
if (var->nameToken() == tok)
|
|
return true;
|
|
if (Token::Match(var->declEndToken(), "; %var%") && var->declEndToken()->next() == tok)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
void CheckStl::invalidContainer()
|
|
{
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
const Library& library = mSettings->library;
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "%var%"))
|
|
continue;
|
|
if (tok->varId() == 0)
|
|
continue;
|
|
if (!astIsContainer(tok))
|
|
continue;
|
|
if (!isInvalidMethod(tok))
|
|
continue;
|
|
std::set<nonneg int> skipVarIds;
|
|
// Skip if the variable is assigned to
|
|
const Token* assignExpr = tok;
|
|
while (assignExpr->astParent()) {
|
|
bool isRHS = astIsRHS(assignExpr);
|
|
assignExpr = assignExpr->astParent();
|
|
if (Token::Match(assignExpr, "%assign%")) {
|
|
if (!isRHS)
|
|
assignExpr = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
if (Token::Match(assignExpr, "%assign%") && Token::Match(assignExpr->astOperand1(), "%var%"))
|
|
skipVarIds.insert(assignExpr->astOperand1()->varId());
|
|
const Token * endToken = nextAfterAstRightmostLeaf(tok->next()->astParent());
|
|
if (!endToken)
|
|
endToken = tok->next();
|
|
const ValueFlow::Value* v = nullptr;
|
|
ErrorPath errorPath;
|
|
PathAnalysis::Info info = PathAnalysis{endToken, library} .forwardFind([&](const PathAnalysis::Info& info) {
|
|
if (!info.tok->variable())
|
|
return false;
|
|
if (info.tok->varId() == 0)
|
|
return false;
|
|
if (skipVarIds.count(info.tok->varId()) > 0)
|
|
return false;
|
|
// if (Token::simpleMatch(info.tok->next(), "."))
|
|
// return false;
|
|
if (Token::Match(info.tok->astParent(), "%assign%") && astIsLHS(info.tok))
|
|
skipVarIds.insert(info.tok->varId());
|
|
if (info.tok->variable()->isReference() &&
|
|
!isVariableDecl(info.tok) &&
|
|
reaches(info.tok->variable()->nameToken(), tok, library, nullptr)) {
|
|
|
|
ErrorPath ep;
|
|
bool addressOf = false;
|
|
const Variable* var = getLifetimeVariable(info.tok, ep, &addressOf);
|
|
// Check the reference is created before the change
|
|
if (var && var->declarationId() == tok->varId() && !addressOf) {
|
|
// An argument always reaches
|
|
if (var->isArgument() || (!var->isReference() && !var->isRValueReference() &&
|
|
!isVariableDecl(tok) && reaches(var->nameToken(), tok, library, &ep))) {
|
|
errorPath = ep;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
for (const ValueFlow::Value& val:info.tok->values()) {
|
|
if (!val.isLocalLifetimeValue())
|
|
continue;
|
|
if (val.lifetimeKind == ValueFlow::Value::LifetimeKind::Address)
|
|
continue;
|
|
if (val.lifetimeKind == ValueFlow::Value::LifetimeKind::SubObject)
|
|
continue;
|
|
if (!val.tokvalue->variable())
|
|
continue;
|
|
if (val.tokvalue->varId() != tok->varId())
|
|
continue;
|
|
ErrorPath ep;
|
|
// Check the iterator is created before the change
|
|
if (val.tokvalue != tok && reaches(val.tokvalue, tok, library, &ep)) {
|
|
v = &val;
|
|
errorPath = ep;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
});
|
|
if (!info.tok)
|
|
continue;
|
|
errorPath.insert(errorPath.end(), info.errorPath.begin(), info.errorPath.end());
|
|
if (v) {
|
|
invalidContainerError(info.tok, tok, v, errorPath);
|
|
} else {
|
|
invalidContainerReferenceError(info.tok, tok, errorPath);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static const Token* getLoopContainer(const Token* tok)
|
|
{
|
|
if (!Token::simpleMatch(tok, "for ("))
|
|
return nullptr;
|
|
const Token * sepTok = tok->next()->astOperand2();
|
|
if (!Token::simpleMatch(sepTok, ":"))
|
|
return nullptr;
|
|
return sepTok->astOperand2();
|
|
}
|
|
|
|
void CheckStl::invalidContainerLoop()
|
|
{
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
const Token* contTok = getLoopContainer(tok);
|
|
if (!contTok)
|
|
continue;
|
|
const Token * blockStart = tok->next()->link()->next();
|
|
const Token * blockEnd = blockStart->link();
|
|
if (!Token::Match(contTok, "%var%"))
|
|
continue;
|
|
if (contTok->varId() == 0)
|
|
continue;
|
|
if (!astIsContainer(contTok))
|
|
continue;
|
|
nonneg int varid = contTok->varId();
|
|
for (const Token* tok2 = blockStart; tok2 != blockEnd; tok2 = tok2->next()) {
|
|
if (tok2->varId() != varid)
|
|
continue;
|
|
if (!Token::Match(tok2->next(), ". %name% ("))
|
|
continue;
|
|
if (!isInvalidMethod(tok2))
|
|
continue;
|
|
const Scope* s = tok2->scope();
|
|
if (!s)
|
|
continue;
|
|
if (isReturnScope(s->bodyEnd, &mSettings->library))
|
|
continue;
|
|
invalidContainerLoopError(tok2, tok);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::invalidContainerLoopError(const Token *tok, const Token * loopTok)
|
|
{
|
|
ErrorPath errorPath;
|
|
const std::string method = tok ? tok->strAt(2) : "erase";
|
|
errorPath.emplace_back(loopTok, "Iterating container here.");
|
|
|
|
const std::string msg = "Calling '" + method + "' while iterating the container is invalid.";
|
|
errorPath.emplace_back(tok, "");
|
|
reportError(errorPath, Severity::error, "invalidContainerLoop", msg, CWE664, false);
|
|
}
|
|
|
|
void CheckStl::invalidContainerError(const Token *tok, const Token * contTok, const ValueFlow::Value *val, ErrorPath errorPath)
|
|
{
|
|
const bool inconclusive = val ? val->isInconclusive() : false;
|
|
std::string method = contTok ? contTok->strAt(2) : "erase";
|
|
errorPath.emplace_back(contTok, "After calling '" + method + "', iterators or references to the container's data may be invalid .");
|
|
if (val)
|
|
errorPath.insert(errorPath.begin(), val->errorPath.begin(), val->errorPath.end());
|
|
std::string msg = "Using " + lifetimeMessage(tok, val, errorPath);
|
|
errorPath.emplace_back(tok, "");
|
|
reportError(errorPath, Severity::error, "invalidContainer", msg + " that may be invalid.", CWE664, inconclusive);
|
|
}
|
|
|
|
void CheckStl::invalidContainerReferenceError(const Token* tok, const Token* contTok, ErrorPath errorPath)
|
|
{
|
|
std::string method = contTok ? contTok->strAt(2) : "erase";
|
|
std::string name = contTok ? contTok->expressionString() : "x";
|
|
errorPath.emplace_back(
|
|
contTok, "After calling '" + method + "', iterators or references to the container's data may be invalid .");
|
|
std::string msg = "Reference to " + name;
|
|
errorPath.emplace_back(tok, "");
|
|
reportError(errorPath, Severity::error, "invalidContainerReference", msg + " that may be invalid.", CWE664, false);
|
|
}
|
|
|
|
void CheckStl::stlOutOfBounds()
|
|
{
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
// Scan through all scopes..
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
const Token* tok = scope.classDef;
|
|
// only interested in conditions
|
|
if ((scope.type != Scope::eFor && scope.type != Scope::eWhile && scope.type != Scope::eIf && scope.type != Scope::eDo) || !tok)
|
|
continue;
|
|
|
|
const Token *condition = nullptr;
|
|
if (scope.type == Scope::eFor) {
|
|
if (Token::simpleMatch(tok->next()->astOperand2(), ";") && Token::simpleMatch(tok->next()->astOperand2()->astOperand2(), ";"))
|
|
condition = tok->next()->astOperand2()->astOperand2()->astOperand1();
|
|
} else if (Token::simpleMatch(tok, "do {") && Token::simpleMatch(tok->linkAt(1), "} while ("))
|
|
condition = tok->linkAt(1)->tokAt(2)->astOperand2();
|
|
else
|
|
condition = tok->next()->astOperand2();
|
|
|
|
if (!condition)
|
|
continue;
|
|
|
|
std::vector<const Token *> conds;
|
|
|
|
visitAstNodes(condition,
|
|
[&](const Token *cond) {
|
|
if (Token::Match(cond, "%oror%|&&"))
|
|
return ChildrenToVisit::op1_and_op2;
|
|
if (cond->isComparisonOp())
|
|
conds.emplace_back(cond);
|
|
return ChildrenToVisit::none;
|
|
});
|
|
|
|
for (const Token *cond : conds) {
|
|
const Token *vartok;
|
|
const Token *containerToken;
|
|
// check in the ast that cond is of the form "%var% <= %var% . %name% ( )"
|
|
if (cond->str() == "<=" && Token::Match(cond->astOperand1(), "%var%") &&
|
|
cond->astOperand2()->str() == "(" && cond->astOperand2()->astOperand1()->str() == "." &&
|
|
Token::Match(cond->astOperand2()->astOperand1()->astOperand1(), "%var%") &&
|
|
Token::Match(cond->astOperand2()->astOperand1()->astOperand2(), "%name%")) {
|
|
vartok = cond->astOperand1();
|
|
containerToken = cond->next();
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
// Is it a array like container?
|
|
const Library::Container* container = containerToken->valueType() ? containerToken->valueType()->container : nullptr;
|
|
if (!container)
|
|
continue;
|
|
if (container->getYield(containerToken->strAt(2)) != Library::Container::Yield::SIZE)
|
|
continue;
|
|
|
|
// variable id for loop variable.
|
|
const int numId = vartok->varId();
|
|
|
|
// variable id for the container variable
|
|
const int declarationId = containerToken->varId();
|
|
const std::string &containerName = containerToken->str();
|
|
|
|
for (const Token *tok3 = scope.bodyStart; tok3 && tok3 != scope.bodyEnd; tok3 = tok3->next()) {
|
|
if (tok3->varId() == declarationId) {
|
|
tok3 = tok3->next();
|
|
if (Token::Match(tok3, ". %name% ( )")) {
|
|
if (container->getYield(tok3->strAt(1)) == Library::Container::Yield::SIZE)
|
|
break;
|
|
} else if (container->arrayLike_indexOp && Token::Match(tok3, "[ %varid% ]", numId))
|
|
stlOutOfBoundsError(tok3, tok3->strAt(1), containerName, false);
|
|
else if (Token::Match(tok3, ". %name% ( %varid% )", numId)) {
|
|
const Library::Container::Yield yield = container->getYield(tok3->strAt(1));
|
|
if (yield == Library::Container::Yield::AT_INDEX)
|
|
stlOutOfBoundsError(tok3, tok3->strAt(3), containerName, true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::stlOutOfBoundsError(const Token *tok, const std::string &num, const std::string &var, bool at)
|
|
{
|
|
if (at)
|
|
reportError(tok, Severity::error, "stlOutOfBounds", "$symbol:" + var + "\nWhen " + num + "==$symbol.size(), $symbol.at(" + num + ") is out of bounds.", CWE788, false);
|
|
else
|
|
reportError(tok, Severity::error, "stlOutOfBounds", "$symbol:" + var + "\nWhen " + num + "==$symbol.size(), $symbol[" + num + "] is out of bounds.", CWE788, false);
|
|
}
|
|
|
|
void CheckStl::negativeIndex()
|
|
{
|
|
// Negative index is out of bounds..
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "%var% [") || WRONG_DATA(!tok->next()->astOperand2(), tok))
|
|
continue;
|
|
const Variable * const var = tok->variable();
|
|
if (!var || tok == var->nameToken())
|
|
continue;
|
|
const Library::Container * const container = mSettings->library.detectContainer(var->typeStartToken());
|
|
if (!container || !container->arrayLike_indexOp)
|
|
continue;
|
|
const ValueFlow::Value *index = tok->next()->astOperand2()->getValueLE(-1, mSettings);
|
|
if (!index)
|
|
continue;
|
|
negativeIndexError(tok, *index);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::negativeIndexError(const Token *tok, const ValueFlow::Value &index)
|
|
{
|
|
const ErrorPath errorPath = getErrorPath(tok, &index, "Negative array index");
|
|
std::ostringstream errmsg;
|
|
if (index.condition)
|
|
errmsg << ValueFlow::eitherTheConditionIsRedundant(index.condition)
|
|
<< ", otherwise there is negative array index " << index.intvalue << ".";
|
|
else
|
|
errmsg << "Array index " << index.intvalue << " is out of bounds.";
|
|
reportError(errorPath, index.errorSeverity() ? Severity::error : Severity::warning, "negativeContainerIndex", errmsg.str(), CWE786, index.isInconclusive());
|
|
}
|
|
|
|
void CheckStl::erase()
|
|
{
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
if (scope.type == Scope::eFor && Token::simpleMatch(scope.classDef, "for (")) {
|
|
const Token *tok = scope.classDef->linkAt(1);
|
|
if (!Token::Match(tok->tokAt(-3), "; ++| %var% ++| ) {"))
|
|
continue;
|
|
tok = tok->previous();
|
|
if (!tok->isName())
|
|
tok = tok->previous();
|
|
eraseCheckLoopVar(scope, tok->variable());
|
|
} else if (scope.type == Scope::eWhile && Token::Match(scope.classDef, "while ( %var% !=")) {
|
|
eraseCheckLoopVar(scope, scope.classDef->tokAt(2)->variable());
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::eraseCheckLoopVar(const Scope &scope, const Variable *var)
|
|
{
|
|
bool inconclusiveType=false;
|
|
if (!isIterator(var, inconclusiveType))
|
|
return;
|
|
for (const Token *tok = scope.bodyStart; tok != scope.bodyEnd; tok = tok->next()) {
|
|
if (tok->str() != "(")
|
|
continue;
|
|
if (!Token::Match(tok->tokAt(-2), ". erase ( ++| %varid% )", var->declarationId()))
|
|
continue;
|
|
// Vector erases are handled by invalidContainer check
|
|
if (isVector(tok->tokAt(-3)))
|
|
continue;
|
|
if (Token::simpleMatch(tok->astParent(), "="))
|
|
continue;
|
|
// Iterator is invalid..
|
|
int indentlevel = 0U;
|
|
const Token *tok2 = tok->link();
|
|
for (; tok2 != scope.bodyEnd; tok2 = tok2->next()) {
|
|
if (tok2->str() == "{") {
|
|
++indentlevel;
|
|
continue;
|
|
}
|
|
if (tok2->str() == "}") {
|
|
if (indentlevel > 0U)
|
|
--indentlevel;
|
|
else if (Token::simpleMatch(tok2, "} else {"))
|
|
tok2 = tok2->linkAt(2);
|
|
continue;
|
|
}
|
|
if (tok2->varId() == var->declarationId()) {
|
|
if (Token::simpleMatch(tok2->next(), "="))
|
|
break;
|
|
dereferenceErasedError(tok, tok2, tok2->str(), inconclusiveType);
|
|
break;
|
|
}
|
|
if (indentlevel == 0U && Token::Match(tok2, "break|return|goto"))
|
|
break;
|
|
}
|
|
if (tok2 == scope.bodyEnd)
|
|
dereferenceErasedError(tok, scope.classDef, var->nameToken()->str(), inconclusiveType);
|
|
}
|
|
}
|
|
|
|
void CheckStl::stlBoundaries()
|
|
{
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Variable* var : symbolDatabase->variableList()) {
|
|
if (!var || !var->scope() || !var->scope()->isExecutable())
|
|
continue;
|
|
|
|
const Library::Container* container = mSettings->library.detectContainer(var->typeStartToken(), true);
|
|
if (!container || container->opLessAllowed)
|
|
continue;
|
|
|
|
const Token* const end = var->scope()->bodyEnd;
|
|
for (const Token *tok = var->nameToken(); tok != end; tok = tok->next()) {
|
|
if (Token::Match(tok, "!!* %varid% <", var->declarationId())) {
|
|
stlBoundariesError(tok);
|
|
} else if (Token::Match(tok, "> %varid% !!.", var->declarationId())) {
|
|
stlBoundariesError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Error message for bad boundary usage..
|
|
void CheckStl::stlBoundariesError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error, "stlBoundaries",
|
|
"Dangerous comparison using operator< on iterator.\n"
|
|
"Iterator compared with operator<. This is dangerous since the order of items in the "
|
|
"container is not guaranteed. One should use operator!= instead to compare iterators.", CWE664, false);
|
|
}
|
|
|
|
static bool if_findCompare(const Token * const tokBack)
|
|
{
|
|
const Token *tok = tokBack->astParent();
|
|
if (!tok)
|
|
return true;
|
|
if (tok->isComparisonOp())
|
|
return (!tok->astOperand1()->isNumber() && !tok->astOperand2()->isNumber());
|
|
if (tok->isArithmeticalOp()) // result is used in some calculation
|
|
return true; // TODO: check if there is a comparison of the result somewhere
|
|
if (tok->str() == ".")
|
|
return true; // Dereferencing is OK, the programmer might know that the element exists - TODO: An inconclusive warning might be appropriate
|
|
if (tok->isAssignmentOp())
|
|
return if_findCompare(tok); // Go one step upwards in the AST
|
|
return false;
|
|
}
|
|
|
|
void CheckStl::if_find()
|
|
{
|
|
const bool printWarning = mSettings->isEnabled(Settings::WARNING);
|
|
const bool printPerformance = mSettings->isEnabled(Settings::PERFORMANCE);
|
|
if (!printWarning && !printPerformance)
|
|
return;
|
|
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
if ((scope.type != Scope::eIf && scope.type != Scope::eWhile) || !scope.classDef)
|
|
continue;
|
|
|
|
const Token *conditionStart = scope.classDef->next();
|
|
if (conditionStart && Token::simpleMatch(conditionStart->astOperand2(), ";"))
|
|
conditionStart = conditionStart->astOperand2();
|
|
|
|
for (const Token *tok = conditionStart; tok->str() != "{"; tok = tok->next()) {
|
|
const Token* funcTok = nullptr;
|
|
const Library::Container* container = nullptr;
|
|
|
|
if (Token::Match(tok, "%name% ("))
|
|
tok = tok->linkAt(1);
|
|
|
|
else if (tok->variable() && Token::Match(tok, "%var% . %name% (")) {
|
|
container = mSettings->library.detectContainer(tok->variable()->typeStartToken());
|
|
funcTok = tok->tokAt(2);
|
|
}
|
|
|
|
// check also for vector-like or pointer containers
|
|
else if (tok->variable() && tok->astParent() && (tok->astParent()->str() == "*" || tok->astParent()->str() == "[")) {
|
|
const Token *tok2 = tok->astParent();
|
|
|
|
if (!Token::Match(tok2->astParent(), ". %name% ("))
|
|
continue;
|
|
|
|
funcTok = tok2->astParent()->next();
|
|
|
|
if (tok->variable()->isArrayOrPointer())
|
|
container = mSettings->library.detectContainer(tok->variable()->typeStartToken());
|
|
else { // Container of container - find the inner container
|
|
container = mSettings->library.detectContainer(tok->variable()->typeStartToken()); // outer container
|
|
tok2 = Token::findsimplematch(tok->variable()->typeStartToken(), "<", tok->variable()->typeEndToken());
|
|
if (container && container->type_templateArgNo >= 0 && tok2) {
|
|
tok2 = tok2->next();
|
|
for (int j = 0; j < container->type_templateArgNo; j++)
|
|
tok2 = tok2->nextTemplateArgument();
|
|
|
|
container = mSettings->library.detectContainer(tok2); // innner container
|
|
} else
|
|
container = nullptr;
|
|
}
|
|
}
|
|
|
|
if (container && container->getAction(funcTok->str()) == Library::Container::Action::FIND) {
|
|
if (if_findCompare(funcTok->next()))
|
|
continue;
|
|
|
|
if (printWarning && container->getYield(funcTok->str()) == Library::Container::Yield::ITERATOR)
|
|
if_findError(tok, false);
|
|
else if (printPerformance && container->stdStringLike && funcTok->str() == "find")
|
|
if_findError(tok, true);
|
|
} else if (printWarning && Token::Match(tok, "std :: find|find_if (")) {
|
|
// check that result is checked properly
|
|
if (!if_findCompare(tok->tokAt(3))) {
|
|
if_findError(tok, false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void CheckStl::if_findError(const Token *tok, bool str)
|
|
{
|
|
if (str && mSettings->standards.cpp >= Standards::CPP20)
|
|
reportError(tok, Severity::performance, "stlIfStrFind",
|
|
"Inefficient usage of string::find() in condition; string::starts_with() could be faster.\n"
|
|
"Either inefficient or wrong usage of string::find(). string::starts_with() will be faster if "
|
|
"string::find's result is compared with 0, because it will not scan the whole "
|
|
"string. If your intention is to check that there are no findings in the string, "
|
|
"you should compare with std::string::npos.", CWE597, false);
|
|
if (!str)
|
|
reportError(tok, Severity::warning, "stlIfFind", "Suspicious condition. The result of find() is an iterator, but it is not properly checked.", CWE398, false);
|
|
}
|
|
|
|
static std::pair<const Token *, const Token *> isMapFind(const Token *tok)
|
|
{
|
|
if (!Token::simpleMatch(tok, "("))
|
|
return {};
|
|
if (!Token::simpleMatch(tok->astOperand1(), "."))
|
|
return {};
|
|
if (!astIsContainer(tok->astOperand1()->astOperand1()))
|
|
return {};
|
|
const Token * contTok = tok->astOperand1()->astOperand1();
|
|
const Library::Container * container = contTok->valueType()->container;
|
|
if (!container)
|
|
return {};
|
|
if (!container->stdAssociativeLike)
|
|
return {};
|
|
if (!Token::Match(tok->astOperand1(), ". find|count ("))
|
|
return {};
|
|
if (!tok->astOperand2())
|
|
return {};
|
|
return {contTok, tok->astOperand2()};
|
|
}
|
|
|
|
static const Token *skipLocalVars(const Token *tok)
|
|
{
|
|
if (!tok)
|
|
return tok;
|
|
if (Token::simpleMatch(tok, "{"))
|
|
return skipLocalVars(tok->next());
|
|
const Scope *scope = tok->scope();
|
|
|
|
const Token *top = tok->astTop();
|
|
if (!top) {
|
|
const Token *semi = Token::findsimplematch(tok, ";");
|
|
if (!semi)
|
|
return tok;
|
|
if (!Token::Match(semi->previous(), "%var% ;"))
|
|
return tok;
|
|
const Token *varTok = semi->previous();
|
|
const Variable *var = varTok->variable();
|
|
if (!var)
|
|
return tok;
|
|
if (var->nameToken() != varTok)
|
|
return tok;
|
|
return skipLocalVars(semi->next());
|
|
}
|
|
if (Token::Match(top, "%assign%")) {
|
|
const Token *varTok = top->astOperand1();
|
|
if (!Token::Match(varTok, "%var%"))
|
|
return tok;
|
|
const Variable *var = varTok->variable();
|
|
if (!var)
|
|
return tok;
|
|
if (var->scope() != scope)
|
|
return tok;
|
|
const Token *endTok = nextAfterAstRightmostLeaf(top);
|
|
if (!endTok)
|
|
return tok;
|
|
return skipLocalVars(endTok->next());
|
|
}
|
|
return tok;
|
|
}
|
|
|
|
static const Token *findInsertValue(const Token *tok, const Token *containerTok, const Token *keyTok, const Library &library)
|
|
{
|
|
const Token *startTok = skipLocalVars(tok);
|
|
const Token *top = startTok->astTop();
|
|
|
|
const Token *icontainerTok = nullptr;
|
|
const Token *ikeyTok = nullptr;
|
|
const Token *ivalueTok = nullptr;
|
|
if (Token::simpleMatch(top, "=") && Token::simpleMatch(top->astOperand1(), "[")) {
|
|
icontainerTok = top->astOperand1()->astOperand1();
|
|
ikeyTok = top->astOperand1()->astOperand2();
|
|
ivalueTok = top->astOperand2();
|
|
}
|
|
if (Token::simpleMatch(top, "(") && Token::Match(top->astOperand1(), ". insert|emplace (") && !astIsIterator(top->astOperand1()->tokAt(2))) {
|
|
icontainerTok = top->astOperand1()->astOperand1();
|
|
const Token *itok = top->astOperand1()->tokAt(2)->astOperand2();
|
|
if (Token::simpleMatch(itok, ",")) {
|
|
ikeyTok = itok->astOperand1();
|
|
ivalueTok = itok->astOperand2();
|
|
} else {
|
|
ikeyTok = itok;
|
|
}
|
|
}
|
|
if (!ikeyTok || !icontainerTok)
|
|
return nullptr;
|
|
if (isSameExpression(true, true, containerTok, icontainerTok, library, true, false) &&
|
|
isSameExpression(true, true, keyTok, ikeyTok, library, true, true)) {
|
|
if (ivalueTok)
|
|
return ivalueTok;
|
|
else
|
|
return ikeyTok;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
void CheckStl::checkFindInsert()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::PERFORMANCE))
|
|
return;
|
|
|
|
const SymbolDatabase *const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope *scope : symbolDatabase->functionScopes) {
|
|
for (const Token *tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::simpleMatch(tok, "if ("))
|
|
continue;
|
|
if (!Token::simpleMatch(tok->next()->link(), ") {"))
|
|
continue;
|
|
if (!Token::Match(tok->next()->astOperand2(), "%comp%"))
|
|
continue;
|
|
const Token *condTok = tok->next()->astOperand2();
|
|
const Token *containerTok;
|
|
const Token *keyTok;
|
|
std::tie(containerTok, keyTok) = isMapFind(condTok->astOperand1());
|
|
if (!containerTok)
|
|
continue;
|
|
|
|
const Token *thenTok = tok->next()->link()->next();
|
|
const Token *valueTok = findInsertValue(thenTok, containerTok, keyTok, mSettings->library);
|
|
if (!valueTok)
|
|
continue;
|
|
|
|
if (Token::simpleMatch(thenTok->link(), "} else {")) {
|
|
const Token *valueTok2 =
|
|
findInsertValue(thenTok->link()->tokAt(2), containerTok, keyTok, mSettings->library);
|
|
if (!valueTok2)
|
|
continue;
|
|
if (isSameExpression(true, true, valueTok, valueTok2, mSettings->library, true, true)) {
|
|
checkFindInsertError(valueTok);
|
|
}
|
|
} else {
|
|
checkFindInsertError(valueTok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::checkFindInsertError(const Token *tok)
|
|
{
|
|
reportError(
|
|
tok, Severity::performance, "stlFindInsert", "Searching before insertion is not necessary.", CWE398, false);
|
|
}
|
|
|
|
/**
|
|
* Is container.size() slow?
|
|
*/
|
|
static bool isCpp03ContainerSizeSlow(const Token *tok)
|
|
{
|
|
if (!tok)
|
|
return false;
|
|
const Variable* var = tok->variable();
|
|
return var && var->isStlType("list");
|
|
}
|
|
|
|
void CheckStl::size()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::PERFORMANCE))
|
|
return;
|
|
|
|
if (mSettings->standards.cpp >= Standards::CPP11)
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart->next(); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (Token::Match(tok, "%var% . size ( )") ||
|
|
Token::Match(tok, "%name% . %var% . size ( )")) {
|
|
// get the variable
|
|
const Token *varTok = tok;
|
|
if (tok->strAt(2) != "size")
|
|
varTok = varTok->tokAt(2);
|
|
|
|
const Token* const end = varTok->tokAt(5);
|
|
|
|
// check for comparison to zero
|
|
if ((tok->previous() && !tok->previous()->isArithmeticalOp() && Token::Match(end, "==|<=|!=|> 0")) ||
|
|
(end->next() && !end->next()->isArithmeticalOp() && Token::Match(tok->tokAt(-2), "0 ==|>=|!=|<"))) {
|
|
if (isCpp03ContainerSizeSlow(varTok)) {
|
|
sizeError(varTok);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// check for comparison to one
|
|
if ((tok->previous() && !tok->previous()->isArithmeticalOp() && Token::Match(end, ">=|< 1") && !end->tokAt(2)->isArithmeticalOp()) ||
|
|
(end->next() && !end->next()->isArithmeticalOp() && Token::Match(tok->tokAt(-2), "1 <=|>") && !tok->tokAt(-3)->isArithmeticalOp())) {
|
|
if (isCpp03ContainerSizeSlow(varTok))
|
|
sizeError(varTok);
|
|
}
|
|
|
|
// check for using as boolean expression
|
|
else if ((Token::Match(tok->tokAt(-2), "if|while (") && end->str() == ")") ||
|
|
(tok->previous()->tokType() == Token::eLogicalOp && Token::Match(end, "&&|)|,|;|%oror%"))) {
|
|
if (isCpp03ContainerSizeSlow(varTok))
|
|
sizeError(varTok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::sizeError(const Token *tok)
|
|
{
|
|
const std::string varname = tok ? tok->str() : std::string("list");
|
|
reportError(tok, Severity::performance, "stlSize",
|
|
"$symbol:" + varname + "\n"
|
|
"Possible inefficient checking for '$symbol' emptiness.\n"
|
|
"Checking for '$symbol' emptiness might be inefficient. "
|
|
"Using $symbol.empty() instead of $symbol.size() can be faster. "
|
|
"$symbol.size() can take linear time but $symbol.empty() is "
|
|
"guaranteed to take constant time.", CWE398, false);
|
|
}
|
|
|
|
void CheckStl::redundantCondition()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::STYLE))
|
|
return;
|
|
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
if (scope.type != Scope::eIf)
|
|
continue;
|
|
|
|
const Token* tok = scope.classDef->tokAt(2);
|
|
if (!Token::Match(tok, "%name% . find ( %any% ) != %name% . end|rend|cend|crend ( ) ) { %name% . remove|erase ( %any% ) ;"))
|
|
continue;
|
|
|
|
// Get tokens for the fields %name% and %any%
|
|
const Token *var1 = tok;
|
|
const Token *any1 = var1->tokAt(4);
|
|
const Token *var2 = any1->tokAt(3);
|
|
const Token *var3 = var2->tokAt(7);
|
|
const Token *any2 = var3->tokAt(4);
|
|
|
|
// Check if all the "%name%" fields are the same and if all the "%any%" are the same..
|
|
if (var1->str() == var2->str() &&
|
|
var2->str() == var3->str() &&
|
|
any1->str() == any2->str()) {
|
|
redundantIfRemoveError(tok);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::redundantIfRemoveError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "redundantIfRemove",
|
|
"Redundant checking of STL container element existence before removing it.\n"
|
|
"Redundant checking of STL container element existence before removing it. "
|
|
"It is safe to call the remove method on a non-existing element.", CWE398, false);
|
|
}
|
|
|
|
void CheckStl::missingComparison()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::WARNING))
|
|
return;
|
|
|
|
const SymbolDatabase* const symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
if (scope.type != Scope::eFor || !scope.classDef)
|
|
continue;
|
|
|
|
for (const Token *tok2 = scope.classDef->tokAt(2); tok2 != scope.bodyStart; tok2 = tok2->next()) {
|
|
if (tok2->str() == ";")
|
|
break;
|
|
|
|
if (!Token::Match(tok2, "%var% = %name% . begin|rbegin|cbegin|crbegin ( ) ; %name% != %name% . end|rend|cend|crend ( ) ; ++| %name% ++| ) {"))
|
|
continue;
|
|
|
|
// same container
|
|
if (tok2->strAt(2) != tok2->strAt(10))
|
|
break;
|
|
|
|
const int iteratorId(tok2->varId());
|
|
|
|
// same iterator
|
|
if (iteratorId == tok2->tokAt(10)->varId())
|
|
break;
|
|
|
|
// increment iterator
|
|
if (!Token::Match(tok2->tokAt(16), "++ %varid% )", iteratorId) &&
|
|
!Token::Match(tok2->tokAt(16), "%varid% ++ )", iteratorId)) {
|
|
break;
|
|
}
|
|
|
|
const Token *incrementToken = nullptr;
|
|
|
|
// Parse loop..
|
|
for (const Token *tok3 = scope.bodyStart; tok3 != scope.bodyEnd; tok3 = tok3->next()) {
|
|
if (Token::Match(tok3, "%varid% ++", iteratorId))
|
|
incrementToken = tok3;
|
|
else if (Token::Match(tok3->previous(), "++ %varid% !!.", iteratorId))
|
|
incrementToken = tok3;
|
|
else if (Token::Match(tok3, "%varid% !=|==", iteratorId))
|
|
incrementToken = nullptr;
|
|
else if (tok3->str() == "break" || tok3->str() == "return")
|
|
incrementToken = nullptr;
|
|
else if (Token::Match(tok3, "%varid% = %name% . insert ( ++| %varid% ++| ,", iteratorId)) {
|
|
// skip insertion..
|
|
tok3 = tok3->linkAt(6);
|
|
if (!tok3)
|
|
break;
|
|
}
|
|
}
|
|
if (incrementToken)
|
|
missingComparisonError(incrementToken, tok2->tokAt(16));
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::missingComparisonError(const Token *incrementToken1, const Token *incrementToken2)
|
|
{
|
|
std::list<const Token*> callstack = { incrementToken1,incrementToken2 };
|
|
|
|
std::ostringstream errmsg;
|
|
errmsg << "Missing bounds check for extra iterator increment in loop.\n"
|
|
<< "The iterator incrementing is suspicious - it is incremented at line ";
|
|
if (incrementToken1)
|
|
errmsg << incrementToken1->linenr();
|
|
errmsg << " and then at line ";
|
|
if (incrementToken2)
|
|
errmsg << incrementToken2->linenr();
|
|
errmsg << ". The loop might unintentionally skip an element in the container. "
|
|
<< "There is no comparison between these increments to prevent that the iterator is "
|
|
<< "incremented beyond the end.";
|
|
|
|
reportError(callstack, Severity::warning, "StlMissingComparison", errmsg.str(), CWE834, false);
|
|
}
|
|
|
|
|
|
static bool isLocal(const Token *tok)
|
|
{
|
|
const Variable *var = tok->variable();
|
|
return var && !var->isStatic() && var->isLocal();
|
|
}
|
|
|
|
namespace {
|
|
const std::set<std::string> stl_string_stream = {
|
|
"istringstream", "ostringstream", "stringstream", "wstringstream"
|
|
};
|
|
}
|
|
|
|
void CheckStl::string_c_str()
|
|
{
|
|
const bool printInconclusive = mSettings->inconclusive;
|
|
const bool printPerformance = mSettings->isEnabled(Settings::PERFORMANCE);
|
|
|
|
const SymbolDatabase* symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
|
|
// Find all functions that take std::string as argument
|
|
std::multimap<std::string, int> c_strFuncParam;
|
|
if (printPerformance) {
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
for (const Function &func : scope.functionList) {
|
|
if (c_strFuncParam.erase(func.tokenDef->str()) != 0) { // Check if function with this name was already found
|
|
c_strFuncParam.insert(std::make_pair(func.tokenDef->str(), 0)); // Disable, because there are overloads. TODO: Handle overloads
|
|
continue;
|
|
}
|
|
|
|
int numpar = 0;
|
|
c_strFuncParam.insert(std::make_pair(func.tokenDef->str(), numpar)); // Insert function as dummy, to indicate that there is at least one function with that name
|
|
for (const Variable &var : func.argumentList) {
|
|
numpar++;
|
|
if (var.isStlStringType() && (!var.isReference() || var.isConst()))
|
|
c_strFuncParam.insert(std::make_pair(func.tokenDef->str(), numpar));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Try to detect common problems when using string::c_str()
|
|
for (const Scope &scope : symbolDatabase->scopeList) {
|
|
if (scope.type != Scope::eFunction || !scope.function)
|
|
continue;
|
|
|
|
enum {charPtr, stdString, stdStringConstRef, Other} returnType = Other;
|
|
if (Token::Match(scope.function->tokenDef->tokAt(-2), "char|wchar_t *"))
|
|
returnType = charPtr;
|
|
else if (Token::Match(scope.function->tokenDef->tokAt(-5), "const std :: string|wstring &"))
|
|
returnType = stdStringConstRef;
|
|
else if (Token::Match(scope.function->tokenDef->tokAt(-3), "std :: string|wstring !!&"))
|
|
returnType = stdString;
|
|
|
|
for (const Token *tok = scope.bodyStart; tok && tok != scope.bodyEnd; tok = tok->next()) {
|
|
// Invalid usage..
|
|
if (Token::Match(tok, "throw %var% . c_str|data ( ) ;") && isLocal(tok->next()) &&
|
|
tok->next()->variable() && tok->next()->variable()->isStlStringType()) {
|
|
string_c_strThrowError(tok);
|
|
} else if (Token::Match(tok, "[;{}] %name% = %var% . str ( ) . c_str|data ( ) ;")) {
|
|
const Variable* var = tok->next()->variable();
|
|
const Variable* var2 = tok->tokAt(3)->variable();
|
|
if (var && var->isPointer() && var2 && var2->isStlType(stl_string_stream))
|
|
string_c_strError(tok);
|
|
} else if (Token::Match(tok, "[;{}] %var% = %name% (") &&
|
|
Token::Match(tok->linkAt(4), ") . c_str|data ( ) ;") &&
|
|
tok->tokAt(3)->function() && Token::Match(tok->tokAt(3)->function()->retDef, "std :: string|wstring %name%")) {
|
|
const Variable* var = tok->next()->variable();
|
|
if (var && var->isPointer())
|
|
string_c_strError(tok);
|
|
} else if (printPerformance && Token::Match(tok, "%name% ( !!)") && c_strFuncParam.find(tok->str()) != c_strFuncParam.end() &&
|
|
!Token::Match(tok->previous(), "::|.") && tok->varId() == 0 && tok->str() != scope.className) { // calling function. TODO: Add support for member functions
|
|
const std::pair<std::multimap<std::string, int>::const_iterator, std::multimap<std::string, int>::const_iterator> range = c_strFuncParam.equal_range(tok->str());
|
|
for (std::multimap<std::string, int>::const_iterator i = range.first; i != range.second; ++i) {
|
|
if (i->second == 0)
|
|
continue;
|
|
|
|
const Token* tok2 = tok->tokAt(2);
|
|
int j;
|
|
for (j = 0; tok2 && j < i->second-1; j++)
|
|
tok2 = tok2->nextArgument();
|
|
if (tok2)
|
|
tok2 = tok2->nextArgument();
|
|
else
|
|
break;
|
|
if (!tok2 && j == i->second-1)
|
|
tok2 = tok->next()->link();
|
|
else if (tok2)
|
|
tok2 = tok2->previous();
|
|
else
|
|
break;
|
|
if (tok2 && Token::Match(tok2->tokAt(-4), ". c_str|data ( )")) {
|
|
const Variable* var = tok2->tokAt(-5)->variable();
|
|
if (var && var->isStlStringType()) {
|
|
string_c_strParam(tok, i->second);
|
|
} else if (Token::Match(tok2->tokAt(-9), "%name% . str ( )")) { // Check ss.str().c_str() as parameter
|
|
const Variable* ssVar = tok2->tokAt(-9)->variable();
|
|
if (ssVar && ssVar->isStlType(stl_string_stream))
|
|
string_c_strParam(tok, i->second);
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// Using c_str() to get the return value is only dangerous if the function returns a char*
|
|
if ((returnType == charPtr || (printPerformance && (returnType == stdString || returnType == stdStringConstRef))) && tok->str() == "return") {
|
|
bool err = false;
|
|
|
|
const Token* tok2 = tok->next();
|
|
if (Token::Match(tok2, "std :: string|wstring (") &&
|
|
Token::Match(tok2->linkAt(3), ") . c_str|data ( ) ;")) {
|
|
err = true;
|
|
} else if (Token::simpleMatch(tok2, "(") &&
|
|
Token::Match(tok2->link(), ") . c_str|data ( ) ;")) {
|
|
// Check for "+ localvar" or "+ std::string(" inside the bracket
|
|
bool is_implicit_std_string = printInconclusive;
|
|
const Token *search_end = tok2->link();
|
|
for (const Token *search_tok = tok2->next(); search_tok != search_end; search_tok = search_tok->next()) {
|
|
if (Token::Match(search_tok, "+ %var%") && isLocal(search_tok->next()) &&
|
|
search_tok->next()->variable() && search_tok->next()->variable()->isStlStringType()) {
|
|
is_implicit_std_string = true;
|
|
break;
|
|
} else if (Token::Match(search_tok, "+ std :: string|wstring (")) {
|
|
is_implicit_std_string = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (is_implicit_std_string)
|
|
err = true;
|
|
}
|
|
|
|
bool local = false;
|
|
bool ptrOrRef = false;
|
|
const Variable* lastVar = nullptr;
|
|
const Function* lastFunc = nullptr;
|
|
bool funcStr = false;
|
|
if (Token::Match(tok2, "%var% .")) {
|
|
local = isLocal(tok2);
|
|
bool refToNonLocal = false;
|
|
if (tok2->variable() && tok2->variable()->isReference()) {
|
|
const Token *refTok = tok2->variable()->nameToken();
|
|
refToNonLocal = true; // safe assumption is default to avoid FPs
|
|
if (Token::Match(refTok, "%var% = %var% .|;|["))
|
|
refToNonLocal = !isLocal(refTok->tokAt(2));
|
|
}
|
|
ptrOrRef = refToNonLocal || (tok2->variable() && tok2->variable()->isPointer());
|
|
}
|
|
while (tok2) {
|
|
if (Token::Match(tok2, "%var% .|::")) {
|
|
if (ptrOrRef)
|
|
local = false;
|
|
lastVar = tok2->variable();
|
|
tok2 = tok2->tokAt(2);
|
|
} else if (Token::Match(tok2, "%name% (") && Token::simpleMatch(tok2->linkAt(1), ") .")) {
|
|
lastFunc = tok2->function();
|
|
local = false;
|
|
funcStr = tok2->str() == "str";
|
|
tok2 = tok2->linkAt(1)->tokAt(2);
|
|
} else
|
|
break;
|
|
}
|
|
|
|
if (Token::Match(tok2, "c_str|data ( ) ;")) {
|
|
if ((local || returnType != charPtr) && lastVar && lastVar->isStlStringType())
|
|
err = true;
|
|
else if (funcStr && lastVar && lastVar->isStlType(stl_string_stream))
|
|
err = true;
|
|
else if (lastFunc && Token::Match(lastFunc->tokenDef->tokAt(-3), "std :: string|wstring"))
|
|
err = true;
|
|
}
|
|
|
|
if (err) {
|
|
if (returnType == charPtr)
|
|
string_c_strError(tok);
|
|
else
|
|
string_c_strReturn(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::string_c_strThrowError(const Token* tok)
|
|
{
|
|
reportError(tok, Severity::error, "stlcstrthrow", "Dangerous usage of c_str(). The value returned by c_str() is invalid after throwing exception.\n"
|
|
"Dangerous usage of c_str(). The string is destroyed after the c_str() call so the thrown pointer is invalid.");
|
|
}
|
|
|
|
void CheckStl::string_c_strError(const Token* tok)
|
|
{
|
|
reportError(tok, Severity::error, "stlcstr", "Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n"
|
|
"Dangerous usage of c_str(). The c_str() return value is only valid until its string is deleted.", CWE664, false);
|
|
}
|
|
|
|
void CheckStl::string_c_strReturn(const Token* tok)
|
|
{
|
|
reportError(tok, Severity::performance, "stlcstrReturn", "Returning the result of c_str() in a function that returns std::string is slow and redundant.\n"
|
|
"The conversion from const char* as returned by c_str() to std::string creates an unnecessary string copy. Solve that by directly returning the string.", CWE704, false);
|
|
}
|
|
|
|
void CheckStl::string_c_strParam(const Token* tok, nonneg int number)
|
|
{
|
|
std::ostringstream oss;
|
|
oss << "Passing the result of c_str() to a function that takes std::string as argument no. " << number << " is slow and redundant.\n"
|
|
"The conversion from const char* as returned by c_str() to std::string creates an unnecessary string copy. Solve that by directly passing the string.";
|
|
reportError(tok, Severity::performance, "stlcstrParam", oss.str(), CWE704, false);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
//
|
|
//---------------------------------------------------------------------------
|
|
|
|
namespace {
|
|
const std::set<std::string> stl_containers_with_empty_and_clear = {
|
|
"deque", "forward_list", "list",
|
|
"map", "multimap", "multiset", "set", "string",
|
|
"unordered_map", "unordered_multimap", "unordered_multiset",
|
|
"unordered_set", "vector", "wstring"
|
|
};
|
|
|
|
}
|
|
|
|
void CheckStl::uselessCalls()
|
|
{
|
|
const bool printPerformance = mSettings->isEnabled(Settings::PERFORMANCE);
|
|
const bool printWarning = mSettings->isEnabled(Settings::WARNING);
|
|
if (!printPerformance && !printWarning)
|
|
return;
|
|
|
|
const SymbolDatabase* symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (const Scope * scope : symbolDatabase->functionScopes) {
|
|
for (const Token* tok = scope->bodyStart; tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (printWarning && Token::Match(tok, "%var% . compare|find|rfind|find_first_not_of|find_first_of|find_last_not_of|find_last_of ( %name% [,)]") &&
|
|
tok->varId() == tok->tokAt(4)->varId()) {
|
|
const Variable* var = tok->variable();
|
|
if (!var || !var->isStlType())
|
|
continue;
|
|
uselessCallsReturnValueError(tok->tokAt(4), tok->str(), tok->strAt(2));
|
|
} else if (printPerformance && Token::Match(tok, "%var% . swap ( %name% )") &&
|
|
tok->varId() == tok->tokAt(4)->varId()) {
|
|
const Variable* var = tok->variable();
|
|
if (!var || !var->isStlType())
|
|
continue;
|
|
uselessCallsSwapError(tok, tok->str());
|
|
} else if (printPerformance && Token::Match(tok, "%var% . substr (") &&
|
|
tok->variable() && tok->variable()->isStlStringType()) {
|
|
if (Token::Match(tok->tokAt(4), "0| )")) {
|
|
uselessCallsSubstrError(tok, false);
|
|
} else if (tok->strAt(4) == "0" && tok->linkAt(3)->strAt(-1) == "npos") {
|
|
if (!tok->linkAt(3)->previous()->variable()) // Make sure that its no variable
|
|
uselessCallsSubstrError(tok, false);
|
|
} else if (Token::simpleMatch(tok->linkAt(3)->tokAt(-2), ", 0 )"))
|
|
uselessCallsSubstrError(tok, true);
|
|
} else if (printWarning && Token::Match(tok, "[{};] %var% . empty ( ) ;") &&
|
|
!tok->tokAt(4)->astParent() &&
|
|
tok->next()->variable() && tok->next()->variable()->isStlType(stl_containers_with_empty_and_clear))
|
|
uselessCallsEmptyError(tok->next());
|
|
else if (Token::Match(tok, "[{};] std :: remove|remove_if|unique (") && tok->tokAt(5)->nextArgument())
|
|
uselessCallsRemoveError(tok->next(), tok->strAt(3));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void CheckStl::uselessCallsReturnValueError(const Token *tok, const std::string &varname, const std::string &function)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "$symbol:" << varname << '\n';
|
|
errmsg << "$symbol:" << function << '\n';
|
|
errmsg << "It is inefficient to call '" << varname << "." << function << "(" << varname << ")' as it always returns 0.\n"
|
|
<< "'std::string::" << function << "()' returns zero when given itself as parameter "
|
|
<< "(" << varname << "." << function << "(" << varname << ")). As it is currently the "
|
|
<< "code is inefficient. It is possible either the string searched ('"
|
|
<< varname << "') or searched for ('" << varname << "') is wrong.";
|
|
reportError(tok, Severity::warning, "uselessCallsCompare", errmsg.str(), CWE628, false);
|
|
}
|
|
|
|
void CheckStl::uselessCallsSwapError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::performance, "uselessCallsSwap",
|
|
"$symbol:" + varname + "\n"
|
|
"It is inefficient to swap a object with itself by calling '$symbol.swap($symbol)'\n"
|
|
"The 'swap()' function has no logical effect when given itself as parameter "
|
|
"($symbol.swap($symbol)). As it is currently the "
|
|
"code is inefficient. Is the object or the parameter wrong here?", CWE628, false);
|
|
}
|
|
|
|
void CheckStl::uselessCallsSubstrError(const Token *tok, bool empty)
|
|
{
|
|
if (empty)
|
|
reportError(tok, Severity::performance, "uselessCallsSubstr", "Ineffective call of function 'substr' because it returns an empty string.", CWE398, false);
|
|
else
|
|
reportError(tok, Severity::performance, "uselessCallsSubstr", "Ineffective call of function 'substr' because it returns a copy of the object. Use operator= instead.", CWE398, false);
|
|
}
|
|
|
|
void CheckStl::uselessCallsEmptyError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning, "uselessCallsEmpty", "Ineffective call of function 'empty()'. Did you intend to call 'clear()' instead?", CWE398, false);
|
|
}
|
|
|
|
void CheckStl::uselessCallsRemoveError(const Token *tok, const std::string& function)
|
|
{
|
|
reportError(tok, Severity::warning, "uselessCallsRemove",
|
|
"$symbol:" + function + "\n"
|
|
"Return value of std::$symbol() ignored. Elements remain in container.\n"
|
|
"The return value of std::$symbol() is ignored. This function returns an iterator to the end of the range containing those elements that should be kept. "
|
|
"Elements past new end remain valid but with unspecified values. Use the erase method of the container to delete them.", CWE762, false);
|
|
}
|
|
|
|
// Check for iterators being dereferenced before being checked for validity.
|
|
// E.g. if (*i && i != str.end()) { }
|
|
void CheckStl::checkDereferenceInvalidIterator()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::WARNING))
|
|
return;
|
|
|
|
// Iterate over "if", "while", and "for" conditions where there may
|
|
// be an iterator that is dereferenced before being checked for validity.
|
|
for (const Scope &scope : mTokenizer->getSymbolDatabase()->scopeList) {
|
|
if (!(scope.type == Scope::eIf || scope.type == Scope::eDo || scope.type == Scope::eWhile || scope.type == Scope::eFor))
|
|
continue;
|
|
|
|
const Token* const tok = scope.classDef;
|
|
const Token* startOfCondition = tok->next();
|
|
if (scope.type == Scope::eDo)
|
|
startOfCondition = startOfCondition->link()->tokAt(2);
|
|
if (!startOfCondition) // ticket #6626 invalid code
|
|
continue;
|
|
const Token* endOfCondition = startOfCondition->link();
|
|
if (!endOfCondition)
|
|
continue;
|
|
|
|
// For "for" loops, only search between the two semicolons
|
|
if (scope.type == Scope::eFor) {
|
|
startOfCondition = Token::findsimplematch(tok->tokAt(2), ";", endOfCondition);
|
|
if (!startOfCondition)
|
|
continue;
|
|
endOfCondition = Token::findsimplematch(startOfCondition->next(), ";", endOfCondition);
|
|
if (!endOfCondition)
|
|
continue;
|
|
}
|
|
|
|
// Only consider conditions composed of all "&&" terms and
|
|
// conditions composed of all "||" terms
|
|
const bool isOrExpression =
|
|
Token::findsimplematch(startOfCondition, "||", endOfCondition) != nullptr;
|
|
const bool isAndExpression =
|
|
Token::findsimplematch(startOfCondition, "&&", endOfCondition) != nullptr;
|
|
|
|
// Look for a check of the validity of an iterator
|
|
const Token* validityCheckTok = nullptr;
|
|
if (!isOrExpression && isAndExpression) {
|
|
validityCheckTok =
|
|
Token::findmatch(startOfCondition, "&& %var% != %name% . end|rend|cend|crend ( )", endOfCondition);
|
|
} else if (isOrExpression && !isAndExpression) {
|
|
validityCheckTok =
|
|
Token::findmatch(startOfCondition, "%oror% %var% == %name% . end|rend|cend|crend ( )", endOfCondition);
|
|
}
|
|
|
|
if (!validityCheckTok)
|
|
continue;
|
|
const int iteratorVarId = validityCheckTok->next()->varId();
|
|
|
|
// If the iterator dereference is to the left of the check for
|
|
// the iterator's validity, report an error.
|
|
const Token* const dereferenceTok =
|
|
Token::findmatch(startOfCondition, "* %varid%", validityCheckTok, iteratorVarId);
|
|
if (dereferenceTok)
|
|
dereferenceInvalidIteratorError(dereferenceTok, dereferenceTok->strAt(1));
|
|
}
|
|
}
|
|
|
|
void CheckStl::dereferenceInvalidIteratorError(const Token* deref, const std::string &iterName)
|
|
{
|
|
reportError(deref, Severity::warning,
|
|
"derefInvalidIterator",
|
|
"$symbol:" + iterName + "\n"
|
|
"Possible dereference of an invalid iterator: $symbol\n"
|
|
"Possible dereference of an invalid iterator: $symbol. Make sure to check that the iterator is valid before dereferencing it - not after.", CWE825, false);
|
|
}
|
|
|
|
|
|
void CheckStl::readingEmptyStlContainer2()
|
|
{
|
|
for (const Scope *function : mTokenizer->getSymbolDatabase()->functionScopes) {
|
|
for (const Token *tok = function->bodyStart; tok != function->bodyEnd; tok = tok->next()) {
|
|
if (!tok->isName() || !tok->valueType())
|
|
continue;
|
|
const Library::Container *container = tok->valueType()->container;
|
|
if (!container)
|
|
continue;
|
|
const ValueFlow::Value *value = tok->getContainerSizeValue(0);
|
|
if (!value)
|
|
continue;
|
|
if (value->isInconclusive() && !mSettings->inconclusive)
|
|
continue;
|
|
if (!value->errorSeverity() && !mSettings->isEnabled(Settings::WARNING))
|
|
continue;
|
|
if (Token::Match(tok, "%name% . %name% (")) {
|
|
if (container->getYield(tok->strAt(2)) == Library::Container::Yield::ITEM)
|
|
readingEmptyStlContainerError(tok,value);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckStl::readingEmptyStlContainerError(const Token *tok, const ValueFlow::Value *value)
|
|
{
|
|
const std::string varname = tok ? tok->str() : std::string("var");
|
|
|
|
std::string errmsg;
|
|
if (value && value->condition)
|
|
errmsg = "Reading from container '$symbol'. " + ValueFlow::eitherTheConditionIsRedundant(value->condition) + " or '$symbol' can be empty.";
|
|
else
|
|
errmsg = "Reading from empty STL container '$symbol'";
|
|
|
|
const ErrorPath errorPath = getErrorPath(tok, value, "Reading from empty container");
|
|
|
|
reportError(errorPath, value ? (value->errorSeverity() ? Severity::error : Severity::warning) : Severity::style, "reademptycontainer", "$symbol:" + varname +"\n" + errmsg, CWE398, !value);
|
|
}
|
|
|
|
void CheckStl::useStlAlgorithmError(const Token *tok, const std::string &algoName)
|
|
{
|
|
reportError(tok, Severity::style, "useStlAlgorithm",
|
|
"Consider using " + algoName + " algorithm instead of a raw loop.", CWE398, false);
|
|
}
|
|
|
|
static bool isEarlyExit(const Token *start)
|
|
{
|
|
if (start->str() != "{")
|
|
return false;
|
|
const Token *endToken = start->link();
|
|
const Token *tok = Token::findmatch(start, "return|throw|break", endToken);
|
|
if (!tok)
|
|
return false;
|
|
const Token *endStatement = Token::findsimplematch(tok, "; }", endToken);
|
|
if (!endStatement)
|
|
return false;
|
|
if (endStatement->next() != endToken)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static const Token *singleStatement(const Token *start)
|
|
{
|
|
if (start->str() != "{")
|
|
return nullptr;
|
|
const Token *endToken = start->link();
|
|
const Token *endStatement = Token::findsimplematch(start->next(), ";");
|
|
if (!Token::simpleMatch(endStatement, "; }"))
|
|
return nullptr;
|
|
if (endStatement->next() != endToken)
|
|
return nullptr;
|
|
return endStatement;
|
|
}
|
|
|
|
static const Token *singleAssignInScope(const Token *start, nonneg int varid, bool &input)
|
|
{
|
|
const Token *endStatement = singleStatement(start);
|
|
if (!endStatement)
|
|
return nullptr;
|
|
if (!Token::Match(start->next(), "%var% %assign%"))
|
|
return nullptr;
|
|
const Token *assignTok = start->tokAt(2);
|
|
if (isVariableChanged(assignTok->next(), endStatement, assignTok->astOperand1()->varId(), false, nullptr, true))
|
|
return nullptr;
|
|
if (isVariableChanged(assignTok->next(), endStatement, varid, false, nullptr, true))
|
|
return nullptr;
|
|
input = Token::findmatch(assignTok->next(), "%varid%", endStatement, varid) || !Token::Match(start->next(), "%var% =");
|
|
return assignTok;
|
|
}
|
|
|
|
static const Token *singleMemberCallInScope(const Token *start, nonneg int varid, bool &input)
|
|
{
|
|
if (start->str() != "{")
|
|
return nullptr;
|
|
const Token *endToken = start->link();
|
|
if (!Token::Match(start->next(), "%var% . %name% ("))
|
|
return nullptr;
|
|
if (!Token::simpleMatch(start->linkAt(4), ") ; }"))
|
|
return nullptr;
|
|
const Token *endStatement = start->linkAt(4)->next();
|
|
if (endStatement->next() != endToken)
|
|
return nullptr;
|
|
|
|
const Token *dotTok = start->tokAt(2);
|
|
if (!Token::findmatch(dotTok->tokAt(2), "%varid%", endStatement, varid))
|
|
return nullptr;
|
|
input = Token::Match(start->next(), "%var% . %name% ( %varid% )", varid);
|
|
if (isVariableChanged(dotTok->next(), endStatement, dotTok->astOperand1()->varId(), false, nullptr, true))
|
|
return nullptr;
|
|
return dotTok;
|
|
}
|
|
|
|
static const Token *singleIncrementInScope(const Token *start, nonneg int varid, bool &input)
|
|
{
|
|
if (start->str() != "{")
|
|
return nullptr;
|
|
const Token *varTok = nullptr;
|
|
if (Token::Match(start->next(), "++ %var% ; }"))
|
|
varTok = start->tokAt(2);
|
|
else if (Token::Match(start->next(), "%var% ++ ; }"))
|
|
varTok = start->tokAt(1);
|
|
if (!varTok)
|
|
return nullptr;
|
|
input = varTok->varId() == varid;
|
|
return varTok;
|
|
}
|
|
|
|
static const Token *singleConditionalInScope(const Token *start, nonneg int varid)
|
|
{
|
|
if (start->str() != "{")
|
|
return nullptr;
|
|
const Token *endToken = start->link();
|
|
if (!Token::simpleMatch(start->next(), "if ("))
|
|
return nullptr;
|
|
if (!Token::simpleMatch(start->linkAt(2), ") {"))
|
|
return nullptr;
|
|
const Token *bodyTok = start->linkAt(2)->next();
|
|
const Token *endBodyTok = bodyTok->link();
|
|
if (!Token::simpleMatch(endBodyTok, "} }"))
|
|
return nullptr;
|
|
if (endBodyTok->next() != endToken)
|
|
return nullptr;
|
|
if (!Token::findmatch(start, "%varid%", bodyTok, varid))
|
|
return nullptr;
|
|
if (isVariableChanged(start, bodyTok, varid, false, nullptr, true))
|
|
return nullptr;
|
|
return bodyTok;
|
|
}
|
|
|
|
static bool addByOne(const Token *tok, nonneg int varid)
|
|
{
|
|
if (Token::Match(tok, "+= %any% ;") &&
|
|
tok->tokAt(1)->hasKnownIntValue() &&
|
|
tok->tokAt(1)->getValue(1)) {
|
|
return true;
|
|
}
|
|
if (Token::Match(tok, "= %varid% + %any% ;", varid) &&
|
|
tok->tokAt(3)->hasKnownIntValue() &&
|
|
tok->tokAt(3)->getValue(1)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool accumulateBoolLiteral(const Token *tok, nonneg int varid)
|
|
{
|
|
if (Token::Match(tok, "%assign% %bool% ;") &&
|
|
tok->tokAt(1)->hasKnownIntValue()) {
|
|
return true;
|
|
}
|
|
if (Token::Match(tok, "= %varid% %oror%|%or%|&&|& %bool% ;", varid) &&
|
|
tok->tokAt(3)->hasKnownIntValue()) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool accumulateBool(const Token *tok, nonneg int varid)
|
|
{
|
|
// Missing %oreq% so we have to check both manually
|
|
if (Token::simpleMatch(tok, "&=") || Token::simpleMatch(tok, "|=")) {
|
|
return true;
|
|
}
|
|
if (Token::Match(tok, "= %varid% %oror%|%or%|&&|&", varid)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool hasVarIds(const Token *tok, nonneg int var1, nonneg int var2)
|
|
{
|
|
if (tok->astOperand1()->varId() == tok->astOperand2()->varId())
|
|
return false;
|
|
if (tok->astOperand1()->varId() == var1 || tok->astOperand1()->varId() == var2) {
|
|
if (tok->astOperand2()->varId() == var1 || tok->astOperand2()->varId() == var2) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static std::string flipMinMax(const std::string &algo)
|
|
{
|
|
if (algo == "std::max_element")
|
|
return "std::min_element";
|
|
if (algo == "std::min_element")
|
|
return "std::max_element";
|
|
return algo;
|
|
}
|
|
|
|
static std::string minmaxCompare(const Token *condTok, nonneg int loopVar, nonneg int assignVar, bool invert = false)
|
|
{
|
|
if (!Token::Match(condTok, "<|<=|>=|>"))
|
|
return "std::accumulate";
|
|
if (!hasVarIds(condTok, loopVar, assignVar))
|
|
return "std::accumulate";
|
|
std::string algo = "std::max_element";
|
|
if (Token::Match(condTok, "<|<="))
|
|
algo = "std::min_element";
|
|
if (condTok->astOperand1()->varId() == assignVar)
|
|
algo = flipMinMax(algo);
|
|
if (invert)
|
|
algo = flipMinMax(algo);
|
|
return algo;
|
|
}
|
|
|
|
void CheckStl::useStlAlgorithm()
|
|
{
|
|
if (!mSettings->isEnabled(Settings::STYLE))
|
|
return;
|
|
for (const Scope *function : mTokenizer->getSymbolDatabase()->functionScopes) {
|
|
for (const Token *tok = function->bodyStart; tok != function->bodyEnd; tok = tok->next()) {
|
|
// Parse range-based for loop
|
|
if (!Token::simpleMatch(tok, "for ("))
|
|
continue;
|
|
if (!Token::simpleMatch(tok->next()->link(), ") {"))
|
|
continue;
|
|
const Token *bodyTok = tok->next()->link()->next();
|
|
const Token *splitTok = tok->next()->astOperand2();
|
|
if (!Token::simpleMatch(splitTok, ":"))
|
|
continue;
|
|
const Token *loopVar = splitTok->previous();
|
|
if (!Token::Match(loopVar, "%var%"))
|
|
continue;
|
|
|
|
// Check for single assignment
|
|
bool useLoopVarInAssign;
|
|
const Token *assignTok = singleAssignInScope(bodyTok, loopVar->varId(), useLoopVarInAssign);
|
|
if (assignTok) {
|
|
int assignVarId = assignTok->astOperand1()->varId();
|
|
std::string algo;
|
|
if (assignVarId == loopVar->varId()) {
|
|
if (useLoopVarInAssign)
|
|
algo = "std::transform";
|
|
else if (Token::Match(assignTok->next(), "%var%|%bool%|%num%|%char% ;"))
|
|
algo = "std::fill";
|
|
else if (Token::Match(assignTok->next(), "%name% ( )"))
|
|
algo = "std::generate";
|
|
else
|
|
algo = "std::fill or std::generate";
|
|
} else {
|
|
if (addByOne(assignTok, assignVarId))
|
|
algo = "std::distance";
|
|
else if (accumulateBool(assignTok, assignVarId))
|
|
algo = "std::any_of, std::all_of, std::none_of, or std::accumulate";
|
|
else if (Token::Match(assignTok, "= %var% <|<=|>=|> %var% ? %var% : %var%") && hasVarIds(assignTok->tokAt(6), loopVar->varId(), assignVarId))
|
|
algo = minmaxCompare(assignTok->tokAt(2), loopVar->varId(), assignVarId, assignTok->tokAt(5)->varId() == assignVarId);
|
|
else
|
|
algo = "std::accumulate";
|
|
}
|
|
useStlAlgorithmError(assignTok, algo);
|
|
continue;
|
|
}
|
|
// Check for container calls
|
|
bool useLoopVarInMemCall;
|
|
const Token *memberAccessTok = singleMemberCallInScope(bodyTok, loopVar->varId(), useLoopVarInMemCall);
|
|
if (memberAccessTok) {
|
|
const Token *memberCallTok = memberAccessTok->astOperand2();
|
|
const int contVarId = memberAccessTok->astOperand1()->varId();
|
|
if (contVarId == loopVar->varId())
|
|
continue;
|
|
if (memberCallTok->str() == "push_back" ||
|
|
memberCallTok->str() == "push_front" ||
|
|
memberCallTok->str() == "emplace_back") {
|
|
std::string algo;
|
|
if (useLoopVarInMemCall)
|
|
algo = "std::copy";
|
|
else
|
|
algo = "std::transform";
|
|
useStlAlgorithmError(memberCallTok, algo);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// Check for increment in loop
|
|
bool useLoopVarInIncrement;
|
|
const Token *incrementTok = singleIncrementInScope(bodyTok, loopVar->varId(), useLoopVarInIncrement);
|
|
if (incrementTok) {
|
|
std::string algo;
|
|
if (useLoopVarInIncrement)
|
|
algo = "std::transform";
|
|
else
|
|
algo = "std::distance";
|
|
useStlAlgorithmError(incrementTok, algo);
|
|
continue;
|
|
}
|
|
|
|
// Check for conditionals
|
|
const Token *condBodyTok = singleConditionalInScope(bodyTok, loopVar->varId());
|
|
if (condBodyTok) {
|
|
// Check for single assign
|
|
assignTok = singleAssignInScope(condBodyTok, loopVar->varId(), useLoopVarInAssign);
|
|
if (assignTok) {
|
|
const int assignVarId = assignTok->astOperand1()->varId();
|
|
std::string algo;
|
|
if (assignVarId == loopVar->varId()) {
|
|
if (useLoopVarInAssign)
|
|
algo = "std::transform";
|
|
else
|
|
algo = "std::replace_if";
|
|
} else {
|
|
if (addByOne(assignTok, assignVarId))
|
|
algo = "std::count_if";
|
|
else if (accumulateBoolLiteral(assignTok, assignVarId))
|
|
algo = "std::any_of, std::all_of, std::none_of, or std::accumulate";
|
|
else
|
|
algo = "std::accumulate";
|
|
}
|
|
useStlAlgorithmError(assignTok, algo);
|
|
continue;
|
|
}
|
|
|
|
// Check for container call
|
|
memberAccessTok = singleMemberCallInScope(condBodyTok, loopVar->varId(), useLoopVarInMemCall);
|
|
if (memberAccessTok) {
|
|
const Token *memberCallTok = memberAccessTok->astOperand2();
|
|
const int contVarId = memberAccessTok->astOperand1()->varId();
|
|
if (contVarId == loopVar->varId())
|
|
continue;
|
|
if (memberCallTok->str() == "push_back" ||
|
|
memberCallTok->str() == "push_front" ||
|
|
memberCallTok->str() == "emplace_back") {
|
|
if (useLoopVarInMemCall)
|
|
useStlAlgorithmError(memberAccessTok, "std::copy_if");
|
|
// There is no transform_if to suggest
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// Check for increment in loop
|
|
incrementTok = singleIncrementInScope(condBodyTok, loopVar->varId(), useLoopVarInIncrement);
|
|
if (incrementTok) {
|
|
std::string algo;
|
|
if (useLoopVarInIncrement)
|
|
algo = "std::transform";
|
|
else
|
|
algo = "std::count_if";
|
|
useStlAlgorithmError(incrementTok, algo);
|
|
continue;
|
|
}
|
|
|
|
// Check early return
|
|
if (isEarlyExit(condBodyTok)) {
|
|
const Token *loopVar2 = Token::findmatch(condBodyTok, "%varid%", condBodyTok->link(), loopVar->varId());
|
|
std::string algo;
|
|
if (loopVar2)
|
|
algo = "std::find_if";
|
|
else
|
|
algo = "std::any_of";
|
|
useStlAlgorithmError(condBodyTok, algo);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isMutex(const Variable* var)
|
|
{
|
|
const Token* tok = Token::typeDecl(var->nameToken()).first;
|
|
return Token::Match(tok, "std :: mutex|recursive_mutex|timed_mutex|recursive_timed_mutex|shared_mutex");
|
|
}
|
|
|
|
static bool isLockGuard(const Variable* var)
|
|
{
|
|
const Token* tok = Token::typeDecl(var->nameToken()).first;
|
|
return Token::Match(tok, "std :: lock_guard|unique_lock|scoped_lock");
|
|
}
|
|
|
|
static bool isLocalMutex(const Variable* var, const Scope* scope)
|
|
{
|
|
if (!var)
|
|
return false;
|
|
return !var->isReference() && !var->isRValueReference() && !var->isStatic() && var->scope() == scope;
|
|
}
|
|
|
|
void CheckStl::globalLockGuardError(const Token* tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"globalLockGuard",
|
|
"Lock guard is defined globally. Lock guards are intended to be local. A global lock guard could lead to a deadlock since it won't unlock until the end of the program.", CWE833, false);
|
|
}
|
|
|
|
void CheckStl::localMutexError(const Token* tok)
|
|
{
|
|
reportError(tok, Severity::warning,
|
|
"localMutex",
|
|
"The lock is ineffective because the mutex is locked at the same scope as the mutex itself.", CWE667, false);
|
|
}
|
|
|
|
void CheckStl::checkMutexes()
|
|
{
|
|
for (const Scope *function : mTokenizer->getSymbolDatabase()->functionScopes) {
|
|
std::set<nonneg int> checkedVars;
|
|
for (const Token *tok = function->bodyStart; tok != function->bodyEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "%var%"))
|
|
continue;
|
|
const Variable* var = tok->variable();
|
|
if (!var)
|
|
continue;
|
|
if (Token::Match(tok, "%var% . lock ( )")) {
|
|
if (!isMutex(var))
|
|
continue;
|
|
if (!checkedVars.insert(var->declarationId()).second)
|
|
continue;
|
|
if (isLocalMutex(var, tok->scope()))
|
|
localMutexError(tok);
|
|
} else if (Token::Match(tok, "%var% (|{ %var% )|}|,")) {
|
|
if (!isLockGuard(var))
|
|
continue;
|
|
const Variable* mvar = tok->tokAt(2)->variable();
|
|
if (!mvar)
|
|
continue;
|
|
if (!checkedVars.insert(mvar->declarationId()).second)
|
|
continue;
|
|
if (var->isStatic() || var->isGlobal())
|
|
globalLockGuardError(tok);
|
|
else if (isLocalMutex(mvar, tok->scope()))
|
|
localMutexError(tok);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|