CompilationDbProjectManager: Sanitize project parsing

The parsing code used to access all kinds of stuff (e.g. the project
tree and the toolchain manager) from the non-UI thread, which is not
allowed.

Fixes: QTCREATORBUG-22420
Change-Id: I4be47919d7e543376d31826dd380f66f4e060458
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/compilationdatabaseprojectmanager/compilationdbparser.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "compilationdatabaseutils.h"
+
+#include <utils/fileutils.h>
+
+#include <QFutureWatcher>
+#include <QList>
+#include <QObject>
+#include <QStringList>
+
+#include <vector>
+
+namespace ProjectExplorer {
+class FileNode;
+class TreeScanner;
+}
+
+namespace CompilationDatabaseProjectManager {
+namespace Internal {
+
+class CompilationDbParser : public QObject
+{
+    Q_OBJECT
+public:
+    explicit CompilationDbParser(const QString &projectName, const Utils::FileName &projectPath,
+                                 const Utils::FileName &rootPath, MimeBinaryCache &mimeBinaryCache,
+                                 QObject *parent = nullptr);
+
+    void start();
+    void stop();
+
+    QList<ProjectExplorer::FileNode *> scannedFiles() const;
+    DbContents dbContents() const { return m_dbContents; }
+
+signals:
+    void finished(bool success);
+
+private:
+    void finish();
+    DbContents parseProject();
+
+    const QString m_projectName;
+    const Utils::FileName m_projectFilePath;
+    const Utils::FileName m_rootPath;
+    MimeBinaryCache &m_mimeBinaryCache;
+    ProjectExplorer::TreeScanner *m_treeScanner = nullptr;
+    QFutureWatcher<DbContents> m_parserWatcher;
+    DbContents m_dbContents;
+};
+
+} // namespace Internal
+} // namespace CompilationDatabaseProjectManager