Put the include depenency table into a separate class, and cache it when possible.

src/libs/cplusplus/DependencyTable.cpp

@@ -0,0 +1,150 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "DependencyTable.h"
+#include "CppDocument.h"
+
+#include <QtCore/QDebug>
+
+using namespace CPlusPlus;
+
+QStringList DependencyTable::filesDependingOn(const QString &fileName) const
+{
+    int index = fileIndex.value(fileName, -1);
+    if (index == -1) {
+        qWarning() << fileName << "not in the snapshot";
+        return QStringList();
+    }
+
+    QStringList deps;
+    for (int i = 0; i < files.size(); ++i) {
+        const QBitArray &bits = includeMap.at(i);
+
+        if (bits.testBit(index))
+            deps.append(files.at(i));
+    }
+
+    return deps;
+}
+
+QHash<QString, QStringList> DependencyTable::dependencyTable() const
+{
+    QHash<QString, QStringList> depMap;
+
+    for (int index = 0; index < files.size(); ++index) {
+        QStringList deps;
+        for (int i = 0; i < files.size(); ++i) {
+            const QBitArray &bits = includeMap.at(i);
+
+            if (bits.testBit(index))
+                deps.append(files.at(i));
+        }
+        depMap[files.at(index)] = deps;
+    }
+
+    return depMap;
+}
+
+bool DependencyTable::isValidFor(const Snapshot &snapshot) const
+{
+    const int documentCount = snapshot.size();
+    if (documentCount != files.size()
+            || documentCount != includesPerFile.size()
+            || documentCount != includeMap.size())
+        return false;
+
+    for (Snapshot::const_iterator it = snapshot.begin(); it != snapshot.end(); ++it) {
+        QHash<QString, QStringList>::const_iterator i = includesPerFile.find(it.key());
+        if (i == includesPerFile.end())
+            return false;
+
+        if (i.value() != it.value()->includedFiles())
+            return false;
+    }
+
+    return true;
+}
+
+void DependencyTable::build(const Snapshot &snapshot)
+{
+    const int documentCount = snapshot.size();
+    files.resize(documentCount);
+    includeMap.resize(documentCount);
+
+    int i = 0;
+    for (Snapshot::const_iterator it = snapshot.begin(); it != snapshot.end();
+            ++it, ++i) {
+        files[i] = it.key();
+        fileIndex[it.key()] = i;
+    }
+
+    for (int i = 0; i < files.size(); ++i) {
+        const QString fileName = files.at(i);
+        if (Document::Ptr doc = snapshot.document(files.at(i))) {
+            QBitArray bitmap(files.size());
+            QList<int> directIncludes;
+            const QStringList documentIncludes = doc->includedFiles();
+            includesPerFile.insert(fileName, documentIncludes);
+
+            foreach (const QString &includedFile, documentIncludes) {
+                int index = fileIndex.value(includedFile);
+
+                if (index == -1)
+                    continue;
+                else if (! directIncludes.contains(index))
+                    directIncludes.append(index);
+
+                bitmap.setBit(index, true);
+            }
+
+            includeMap[i] = bitmap;
+            includes[i] = directIncludes;
+        }
+    }
+
+    bool changed;
+
+    do {
+        changed = false;
+
+        for (int i = 0; i < files.size(); ++i) {
+            QBitArray bitmap = includeMap.value(i);
+            QBitArray previousBitmap = bitmap;
+
+            foreach (int includedFileIndex, includes.value(i)) {
+                bitmap |= includeMap.value(includedFileIndex);
+            }
+
+            if (bitmap != previousBitmap) {
+                includeMap[i] = bitmap;
+                changed = true;
+            }
+        }
+    } while (changed);
+}