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

src/libs/cplusplus/CppDocument.cpp

@@ -570,109 +570,3 @@ void Snapshot::simplified_helper(Document::Ptr doc, Snapshot *snapshot) const
         }
     }
 }
-
-QStringList Snapshot::filesDependingOn(const QString &fileName) const
-{
-    const int N = size();
-    QVector<QString> files(N);
-    QHash<QString, int> fileIndex;
-    QHash<int, QList<int> > includes;
-    QVector<QBitArray> includeMap(N);
-
-    dependency_helper(files, fileIndex, includes, includeMap);
-
-    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> Snapshot::dependencyTable() const
-{
-    const int N = size();
-    QVector<QString> files(N);
-    QHash<QString, int> fileIndex;
-    QHash<int, QList<int> > includes;
-    QVector<QBitArray> includeMap(N);
-
-    dependency_helper(files, fileIndex, includes, includeMap);
-
-    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;
-}
-
-void Snapshot::dependency_helper(QVector<QString> &files,
-                                 QHash<QString, int> &fileIndex,
-                                 QHash<int, QList<int> > &includes,
-                                 QVector<QBitArray> &includeMap) const
-{
-    int i = 0;
-    for (const_iterator it = begin(); it != end(); ++it, ++i) {
-        files[i] = it.key();
-        fileIndex[it.key()] = i;
-    }
-
-    for (int i = 0; i < files.size(); ++i) {
-        if (Document::Ptr doc = document(files.at(i))) {
-            QBitArray bitmap(files.size());
-            QList<int> directIncludes;
-
-            foreach (const QString &includedFile, doc->includedFiles()) {
-                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);
-}

src/libs/cplusplus/CppDocument.h

@@ -365,15 +365,8 @@ public:
 
     QSharedPointer<NamespaceBinding> globalNamespaceBinding(Document::Ptr doc) const;
 
-    QStringList filesDependingOn(const QString &fileName) const;
-    QHash<QString, QStringList> dependencyTable() const;
-
 private:
     void simplified_helper(Document::Ptr doc, Snapshot *snapshot) const;
-    void dependency_helper(QVector<QString> &files,
-                           QHash<QString, int> &fileIndex,
-                           QHash<int, QList<int> > &includes,
-                           QVector<QBitArray> &includeMap) const;
 
 private:
     _Base _documents;

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);
+}

src/libs/cplusplus/DependencyTable.h

@@ -0,0 +1,65 @@
+/**************************************************************************
+**
+** 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.
+**
+**************************************************************************/
+
+#ifndef DEPENDENCYTABLE_H
+#define DEPENDENCYTABLE_H
+
+#include <CPlusPlusForwardDeclarations.h>
+
+#include <QtCore/QBitArray>
+#include <QtCore/QHash>
+#include <QtCore/QString>
+#include <QtCore/QStringList>
+#include <QtCore/QVector>
+
+namespace CPlusPlus {
+
+class Snapshot;
+
+class CPLUSPLUS_EXPORT DependencyTable
+{
+public:
+    bool isValidFor(const Snapshot &snapshot) const;
+
+    QStringList filesDependingOn(const QString &fileName) const;
+    QHash<QString, QStringList> dependencyTable() const;
+
+    void build(const Snapshot &snapshot);
+
+private:
+    QHash<QString, QStringList> includesPerFile;
+    QVector<QString> files;
+    QHash<QString, int> fileIndex;
+    QHash<int, QList<int> > includes;
+    QVector<QBitArray> includeMap;
+};
+
+} // namespace CPlusPlus
+
+#endif // DEPENDENCYTABLE_H

src/libs/cplusplus/cplusplus-lib.pri

@@ -40,6 +40,7 @@ HEADERS += \
     $$PWD/GenTemplateInstance.h \
     $$PWD/FindUsages.h \
     $$PWD/CheckUndefinedSymbols.h \
+    $$PWD/DependencyTable.h \
     $$PWD/PreprocessorClient.h \
     $$PWD/PreprocessorEnvironment.h \
     $$PWD/Macro.h \
@@ -64,6 +65,7 @@ SOURCES += \
     $$PWD/GenTemplateInstance.cpp \
     $$PWD/FindUsages.cpp \
     $$PWD/CheckUndefinedSymbols.cpp \
+    $$PWD/DependencyTable.cpp \
     $$PWD/PreprocessorClient.cpp \
     $$PWD/PreprocessorEnvironment.cpp \
     $$PWD/FastPreprocessor.cpp \