C++: use a global string table for SearchSymbols.

This string table uniques strings, so that multiple identical strings
share their contents. It is used by the locator and the symbol searcher,
and will later be used by the class view.

Change-Id: Ib8b50f69bbf994d0d7a39b66dc8caf1a3d9bfb42
Reviewed-by: Nikolai Kosjar <[email protected]>

1 files changed, 77 insertions, 0 deletions

diff --git a/src/plugins/cpptools/stringtable.h b/src/plugins/cpptools/stringtable.h
new file mode 100644
index 00000000000..31852f635f9
--- /dev/null
+++ b/src/plugins/cpptools/stringtable.h
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef STRINGTABLE_H
+#define STRINGTABLE_H
+
+#include <QAtomicInt>
+#include <QMutex>
+#include <QObject>
+#include <QRunnable>
+#include <QSet>
+#include <QTimer>
+
+namespace CppTools {
+namespace Internal {
+
+class StringTable: public QObject
+{
+    Q_OBJECT
+
+public:
+    StringTable();
+
+    QString insert(const QString &string);
+    void scheduleGC();
+
+private slots:
+    void startGC();
+
+private:
+    void GC();
+    class GCRunner: public QRunnable {
+        StringTable &m_stringTable;
+
+    public:
+        GCRunner(StringTable &stringTable): m_stringTable(stringTable) {}
+        virtual void run() { m_stringTable.GC(); }
+    } m_gcRunner;
+    friend class GCRunner;
+
+private:
+    mutable QMutex m_lock;
+    QAtomicInt m_stopGCRequested;
+    QSet<QString> m_strings;
+    QTimer m_gcCountDown;
+};
+
+} // Internal namespace
+} // CppTools namespace
+
+#endif // STRINGTABLE_H