9d0b06e9f7
Inspired by 6e6ae98037
Change-Id: Ia0f264d3a6bbf076aa5080e3398683e50bc6ef01
Reviewed-on: https://gerrit.libreoffice.org/20190
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
|
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*/
|
|
|
|
#include <string>
|
|
#include <iostream>
|
|
|
|
#include "plugin.hxx"
|
|
#include "compat.hxx"
|
|
#include "clang/AST/CXXInheritance.h"
|
|
|
|
// Check that we're not unnecessarily copying variables in a range based for loop
|
|
// e.g. "for (OUString a: aList)" results in a copy of each string being made,
|
|
// whereas "for (const OUString& a: aList)" does not.
|
|
|
|
namespace
|
|
{
|
|
|
|
class RangedForCopy:
|
|
public RecursiveASTVisitor<RangedForCopy>, public loplugin::Plugin
|
|
{
|
|
public:
|
|
explicit RangedForCopy(InstantiationData const & data): Plugin(data) {}
|
|
|
|
virtual void run() override {
|
|
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
|
|
}
|
|
|
|
bool VisitCXXForRangeStmt( const CXXForRangeStmt* stmt );
|
|
};
|
|
|
|
bool RangedForCopy::VisitCXXForRangeStmt( const CXXForRangeStmt* stmt )
|
|
{
|
|
if (ignoreLocation( stmt ))
|
|
return true;
|
|
|
|
const VarDecl* varDecl = stmt->getLoopVariable();
|
|
if (!varDecl)
|
|
return true;
|
|
|
|
const QualType type = varDecl->getType();
|
|
if (type->isRecordType() && !type->isReferenceType() && !type->isPointerType())
|
|
{
|
|
std::string name = type.getAsString();
|
|
report(
|
|
DiagnosticsEngine::Warning,
|
|
"Loop variable passed by value, pass by reference instead, e.g. 'const %0&'",
|
|
varDecl->getLocStart())
|
|
<< name << varDecl->getSourceRange();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
loplugin::Plugin::Registration< RangedForCopy > X("rangedforcopy");
|
|
|
|
}
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|