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/*
This file is part of the clazy static checker.
Copyright (C) 2015 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Author: Sérgio Martins <sergio.martins@kdab.com>
Copyright (C) 2015,2018 Sergio Martins <smartins@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "function-args-by-ref.h"
#include "Utils.h"
#include "FixItUtils.h"
#include "TypeUtils.h"
#include "ClazyContext.h"
#include "StringUtils.h"
#include <clang/AST/AST.h>
#include <clang/Lex/Lexer.h>
using namespace clang;
using namespace std;
static bool shouldIgnoreClass(CXXRecordDecl *record)
{
if (!record)
return false;
if (Utils::isSharedPointer(record))
return true;
static const vector<string> ignoreList = {"QDebug", // Too many warnings
"QGenericReturnArgument",
"QColor", // TODO: Remove in Qt6
"QStringRef", // TODO: Remove in Qt6
"QList::const_iterator", // TODO: Remove in Qt6
"QJsonArray::const_iterator", // TODO: Remove in Qt6
"QList<QString>::const_iterator", // TODO: Remove in Qt6
"QtMetaTypePrivate::QSequentialIterableImpl",
"QtMetaTypePrivate::QAssociativeIterableImpl",
"QVariantComparisonHelper",
"QHashDummyValue", "QCharRef", "QString::Null"
};
return clazy::contains(ignoreList, record->getQualifiedNameAsString());
}
static bool shouldIgnoreOperator(FunctionDecl *function)
{
// Too many warnings in operator<<
static const vector<StringRef> ignoreList = { "operator<<" };
return clazy::contains(ignoreList, clazy::name(function));
}
static bool shouldIgnoreFunction(clang::FunctionDecl *function)
{
static const vector<string> qualifiedIgnoreList = {"QDBusMessage::createErrorReply", // Fixed in Qt6
"QMenu::exec", // Fixed in Qt6
"QTextFrame::iterator", // Fixed in Qt6
"QGraphicsWidget::addActions", // Fixed in Qt6
"QListWidget::mimeData", // Fixed in Qt6
"QTableWidget::mimeData", // Fixed in Qt6
"QTreeWidget::mimeData", // Fixed in Qt6
"QWidget::addActions", // Fixed in Qt6
"QSslCertificate::verify", // Fixed in Qt6
"QSslConfiguration::setAllowedNextProtocols" // Fixed in Qt6
};
return clazy::contains(qualifiedIgnoreList, function->getQualifiedNameAsString());
}
FunctionArgsByRef::FunctionArgsByRef(const std::string &name, ClazyContext *context)
: CheckBase(name, context, Option_CanIgnoreIncludes)
{
}
static std::string warningMsgForSmallType(int sizeOf, const std::string &typeName)
{
std::string sizeStr = std::to_string(sizeOf);
return "Missing reference on large type (sizeof " + typeName + " is " + sizeStr + " bytes)";
}
void FunctionArgsByRef::processFunction(FunctionDecl *func)
{
if (!func || !func->isThisDeclarationADefinition() || func->isDeleted() || shouldIgnoreOperator(func))
return;
if (m_context->isQtDeveloper() && shouldIgnoreFunction(func))
return;
const bool warnForOverriddenMethods = isOptionSet("warn-for-overridden-methods");
if (!warnForOverriddenMethods && Utils::methodOverrides(dyn_cast<CXXMethodDecl>(func))) {
// When overriding you can't change the signature. You should fix the base classes first
return;
}
Stmt *body = func->getBody();
int i = -1;
for (auto param : Utils::functionParameters(func)) {
i++;
QualType paramQt = TypeUtils::unrefQualType(param->getType());
const Type *paramType = paramQt.getTypePtrOrNull();
if (!paramType || paramType->isIncompleteType() || paramType->isDependentType())
continue;
if (shouldIgnoreClass(paramType->getAsCXXRecordDecl()))
continue;
TypeUtils::QualTypeClassification classif;
bool success = TypeUtils::classifyQualType(m_context, param, classif, body);
if (!success)
continue;
vector<CXXCtorInitializer *> ctorInits = Utils::ctorInitializer(dyn_cast<CXXConstructorDecl>(func), param);
if (Utils::ctorInitializerContainsMove(ctorInits))
continue;
if (classif.passBigTypeByConstRef || classif.passNonTriviallyCopyableByConstRef) {
string error;
std::vector<FixItHint> fixits;
const string paramStr = param->getType().getAsString();
if (classif.passBigTypeByConstRef) {
error = warningMsgForSmallType(classif.size_of_T, paramStr);
} else if (classif.passNonTriviallyCopyableByConstRef) {
error = "Missing reference on non-trivial type (" + paramStr + ')';
}
emitWarning(getLocStart(param), error.c_str(), fixits);
}
}
}
void FunctionArgsByRef::VisitDecl(Decl *decl)
{
processFunction(dyn_cast<FunctionDecl>(decl));
}
void FunctionArgsByRef::VisitStmt(Stmt *stmt)
{
if (auto lambda = dyn_cast<LambdaExpr>(stmt)) {
if (!shouldIgnoreFile(getLocStart(stmt)))
processFunction(lambda->getCallOperator());
}
}
clang::FixItHint FunctionArgsByRef::fixit(const ParmVarDecl *, TypeUtils::QualTypeClassification)
{
FixItHint fixit;
return fixit;
}
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