Clang: Add clang query

Clang query is mechanism to use AST matcher to search for code. Think
about regular expression but in the context of AST. So you get a semantic
search tool for C++.

Change-Id: I72e882c5b53a0c52f352a3664847c4c3e4f6fc2e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/clangbackendipc/dynamicastmatcherdiagnosticcontextcontainer.cpp

@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** 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.
+**
+****************************************************************************/
+
+#include "dynamicastmatcherdiagnosticcontextcontainer.h"
+
+
+
+namespace ClangBackEnd {
+
+QDebug operator<<(QDebug debug, const DynamicASTMatcherDiagnosticContextContainer &container)
+{
+    debug.nospace() << "DynamicASTMatcherDiagnosticContextContainer("
+                    << container.sourceRange() << ", "
+                    << container.contextTypeText() << ", "
+                    << container.arguments()
+                    << ")";
+
+    return debug;
+}
+
+void PrintTo(const DynamicASTMatcherDiagnosticContextContainer &container, ::std::ostream* os)
+{
+    *os << "{"
+        << container.contextTypeText() << ": ";
+
+    PrintTo(container.sourceRange(), os);
+
+    *os    << ", [";
+
+    for (const auto &argument : container.arguments()) {
+        PrintTo(argument, os);
+        *os << ", ";
+    }
+
+    *os << "]}";
+}
+
+#define RETURN_CASE(name) \
+    case ClangQueryDiagnosticContextType::name: return #name;
+
+Utils::SmallString DynamicASTMatcherDiagnosticContextContainer::contextTypeText() const
+{
+    switch (contextType_) {
+       RETURN_CASE(MatcherArg)
+       RETURN_CASE(MatcherConstruct)
+    }
+
+    Q_UNREACHABLE();
+}
+
+} // namespace ClangBackEnd