/*
   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 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 "global-const-char-pointer.h"

#include <clang/AST/Decl.h>
#include <clang/AST/DeclCXX.h>

using namespace clang;

GlobalConstCharPointer::GlobalConstCharPointer(const std::string &name, ClazyContext *context)
    : CheckBase(name, context)
{
    m_filesToIgnore = { "3rdparty", "mysql.h", "qpicture.cpp" };
}

void GlobalConstCharPointer::VisitDecl(clang::Decl *decl)
{
    VarDecl *varDecl = dyn_cast<VarDecl>(decl);
    if (!varDecl || !varDecl->hasGlobalStorage() || varDecl->isCXXClassMember() ||
        !varDecl->hasExternalFormalLinkage() || decl->isInAnonymousNamespace() || varDecl->hasExternalStorage())
        return;

    if (shouldIgnoreFile(getLocStart(decl)))
        return;

    QualType qt = varDecl->getType();
    const Type *type = qt.getTypePtrOrNull();
    if (!type || !type->isPointerType() || qt.isConstQualified() || varDecl->isStaticLocal())
        return;

    QualType pointeeQt = type->getPointeeType();
    const Type *pointeeType = pointeeQt.getTypePtrOrNull();
    if (!pointeeType || !pointeeType->isCharType())
        return;

    emitWarning(getLocStart(decl), "non const global char *");
}
