Clang: Extend clang query

It's a first step to introduce clang query.

Change-Id: I4d001a8883f56066765ce6bc561fa3f49611c0a4
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/tools/clangrefactoringbackend/source/locationsourcefilecallbacks.h

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+/****************************************************************************
+**
+** Copyright (C) 2016 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 <sourcelocationscontainer.h>
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+#include <clang/Tooling/Tooling.h>
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
+namespace llvm {
+class StringRef;
+}
+
+namespace clang {
+class CompilerInstance;
+}
+
+namespace ClangBackEnd {
+
+class MacroPreprocessorCallbacks;
+class SourceLocationsContainer;
+
+class LocationSourceFileCallbacks : public clang::tooling::SourceFileCallbacks
+{
+public:
+    LocationSourceFileCallbacks(uint line, uint column);
+
+    bool handleBeginSource(clang::CompilerInstance &compilerInstance,
+                           llvm::StringRef fileName) override;
+
+    SourceLocationsContainer takeSourceLocations();
+    Utils::SmallString takeSymbolName();
+
+    bool hasSourceLocations() const;
+
+private:
+    SourceLocationsContainer sourceLocationsContainer;
+    Utils::SmallString symbolName;
+    MacroPreprocessorCallbacks *macroPreprocessorCallbacks;
+    uint line;
+    uint column;
+};
+
+} // namespace ClangBackEnd