cppmodelmanager.cpp 23.4 KB
Newer Older
con's avatar
con committed
1 2 3 4 5 6 7 8
/***************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact:  Qt Software Information (qt-info@nokia.com)
**
9 10 11
**
** Non-Open Source Usage
**
con's avatar
con committed
12 13 14
** Licensees may use this file in accordance with the Qt Beta Version
** License Agreement, Agreement version 2.2 provided with the Software or,
** alternatively, in accordance with the terms contained in a written
15 16 17 18
** agreement between you and Nokia.
**
** GNU General Public License Usage
**
con's avatar
con committed
19 20 21 22 23 24 25 26 27 28
** Alternatively, this file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the packaging
** of this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
**
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** In addition, as a special exception, Nokia gives you certain additional
29 30 31 32
** rights. These rights are described in the Nokia Qt GPL Exception
** version 1.2, included in the file GPL_EXCEPTION.txt in this package.
**
***************************************************************************/
hjk's avatar
hjk committed
33

con's avatar
con committed
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
#define _SCL_SECURE_NO_WARNINGS 1
#include "pp.h"

#include "cppmodelmanager.h"
#include "cpphoverhandler.h"
#include "cpptoolsconstants.h"
#include "cpptoolseditorsupport.h"

#include <qtconcurrent/runextensions.h>
#include <texteditor/itexteditor.h>
#include <texteditor/basetexteditor.h>

#include <projectexplorer/project.h>
#include <projectexplorer/projectexplorer.h>
#include <projectexplorer/projectexplorerconstants.h>
#include <projectexplorer/session.h>

#include <coreplugin/icore.h>
#include <coreplugin/uniqueidmanager.h>
#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/progressmanager/progressmanager.h>

#include <TranslationUnit.h>
#include <Semantic.h>
#include <AST.h>
#include <Scope.h>
#include <Literals.h>
#include <Symbols.h>
#include <Names.h>
#include <NameVisitor.h>
#include <TypeVisitor.h>
#include <Lexer.h>
#include <Token.h>

#include <QPlainTextEdit>
#include <QTime>
#include <QDebug>

using namespace CPlusPlus;

namespace CppTools {
namespace Internal {

static const char pp_configuration_file[] = "<configuration>";

static const char pp_configuration[] =
    "# 1 \"<configuration>\"\n"
    "#define __GNUC_MINOR__ 0\n"
    "#define __GNUC__ 4\n"
    "#define __GNUG__ 4\n"
    "#define __STDC_HOSTED__ 1\n"
    "#define __VERSION__ \"4.0.1 (fake)\"\n"
    "#define __cplusplus 1\n"

    "#define __extension__\n"
    "#define __context__\n"
    "#define __range__\n"
    "#define __asm(a...)\n"
    "#define __asm__(a...)\n"
    "#define   restrict\n"
    "#define __restrict\n"

    // ### add macros for win32
    "#define __cdecl\n"
    "#define QT_WA(x) x\n"
    "#define API\n"
    "#define WINAPI\n"
    "#define CALLBACK\n"
    "#define STDMETHODCALLTYPE\n"
    "#define __RPC_FAR\n"
    "#define APIENTRY\n"
    "#define __declspec(a)\n"
    "#define STDMETHOD(method) virtual HRESULT STDMETHODCALLTYPE method\n";

class CppPreprocessor: public rpp::Client
{
public:
    CppPreprocessor(QPointer<CppModelManager> modelManager)
        : m_modelManager(modelManager),
          m_documents(modelManager->documents()),
          m_proc(this, env)
    { }

    void setWorkingCopy(const QMap<QString, QByteArray> &workingCopy)
    { m_workingCopy = workingCopy; }

    void setIncludePaths(const QStringList &includePaths)
    { m_includePaths = includePaths; }

    void setFrameworkPaths(const QStringList &frameworkPaths)
    { m_frameworkPaths = frameworkPaths; }

    void addIncludePath(const QString &path)
    { m_includePaths.append(path); }

    void setProjectFiles(const QStringList &files)
    { m_projectFiles = files; }

    void operator()(QString &fileName)
    { sourceNeeded(fileName, IncludeGlobal); }

protected:
    bool includeFile(const QString &absoluteFilePath, QByteArray *result)
    {
        if (absoluteFilePath.isEmpty() || m_included.contains(absoluteFilePath)) {
            return true;
        }

        if (m_workingCopy.contains(absoluteFilePath)) {
            m_included.insert(absoluteFilePath);
            *result = m_workingCopy.value(absoluteFilePath);
            return true;
        }

        QFileInfo fileInfo(absoluteFilePath);
        if (! fileInfo.isFile())
            return false;

        QFile file(absoluteFilePath);
        if (file.open(QFile::ReadOnly)) {
            m_included.insert(absoluteFilePath);
            QTextStream stream(&file);
            const QString contents = stream.readAll();
            *result = contents.toUtf8();
            file.close();
            return true;
        }

        return false;
    }

    QByteArray tryIncludeFile(QString &fileName, IncludeType type)
    {
        QFileInfo fileInfo(fileName);
        if (fileName == QLatin1String(pp_configuration_file) || fileInfo.isAbsolute()) {
            QByteArray contents;
            includeFile(fileName, &contents);
            return contents;
        }

        if (type == IncludeLocal && m_currentDoc) {
            QFileInfo currentFileInfo(m_currentDoc->fileName());
            QString path = currentFileInfo.absolutePath();
            path += QLatin1Char('/');
            path += fileName;
            path = QDir::cleanPath(path);
            QByteArray contents;
            if (includeFile(path, &contents)) {
                fileName = path;
                return contents;
            }
        }

        foreach (const QString &includePath, m_includePaths) {
            QString path = includePath;
            path += QLatin1Char('/');
            path += fileName;
            path = QDir::cleanPath(path);
            QByteArray contents;
            if (includeFile(path, &contents)) {
                fileName = path;
                return contents;
            }
        }

        // look in the system include paths
        foreach (const QString &includePath, m_systemIncludePaths) {
            QString path = includePath;
            path += QLatin1Char('/');
            path += fileName;
            path = QDir::cleanPath(path);
            QByteArray contents;
            if (includeFile(path, &contents)) {
                fileName = path;
                return contents;
            }
        }

        int index = fileName.indexOf(QLatin1Char('/'));
        if (index != -1) {
            QString frameworkName = fileName.left(index);
            QString name = fileName.mid(index + 1);

            foreach (const QString &frameworkPath, m_frameworkPaths) {
                QString path = frameworkPath;
                path += QLatin1Char('/');
                path += frameworkName;
                path += QLatin1String(".framework/Headers/");
                path += name;
                QByteArray contents;
                if (includeFile(path, &contents)) {
                    fileName = path;
                    return contents;
                }
            }
        }

        QString path = fileName;
        if (path.at(0) != QLatin1Char('/'))
            path.prepend(QLatin1Char('/'));

        foreach (const QString &projectFile, m_projectFiles) {
            if (projectFile.endsWith(path)) {
                fileName = projectFile;
                QByteArray contents;
                includeFile(fileName, &contents);
                return contents;
            }
        }

        //qDebug() << "**** file" << fileName << "not found!";
        return QByteArray();
    }

    virtual void macroAdded(const QByteArray &macroName, const QByteArray &macroText)
    {
        if (! m_currentDoc)
            return;

        m_currentDoc->appendMacro(macroName, macroText);
    }

    void mergeEnvironment(Document::Ptr doc)
    {
        QSet<QString> processed;
        mergeEnvironment(doc, &processed);
    }

    void mergeEnvironment(Document::Ptr doc, QSet<QString> *processed)
    {
        if (! doc)
            return;

        const QString fn = doc->fileName();

        if (processed->contains(fn))
            return;

        processed->insert(fn);

        foreach (QString includedFile, doc->includedFiles())
            mergeEnvironment(m_documents.value(includedFile), processed);

        const QByteArray macros = doc->definedMacros();
        QByteArray localFileName = doc->fileName().toUtf8();

        QByteArray dummy;
        m_proc(localFileName, macros, &dummy);
    }

    virtual void startSkippingBlocks(unsigned offset)
    {
        //qDebug() << "start skipping blocks:" << offset;
        if (m_currentDoc)
            m_currentDoc->startSkippingBlocks(offset);
    }

    virtual void stopSkippingBlocks(unsigned offset)
    {
        //qDebug() << "stop skipping blocks:" << offset;
        if (m_currentDoc)
            m_currentDoc->stopSkippingBlocks(offset);
    }

    virtual void sourceNeeded(QString &fileName, IncludeType type)
    {
        if (fileName.isEmpty())
            return;

        QByteArray contents = tryIncludeFile(fileName, type);

        if (m_currentDoc) {
            m_currentDoc->addIncludeFile(fileName);
            if (contents.isEmpty() && ! QFileInfo(fileName).isAbsolute()) {
                QString msg;
                msg += fileName;
                msg += QLatin1String(": No such file or directory");
                Document::DiagnosticMessage d(Document::DiagnosticMessage::Warning,
                                              m_currentDoc->fileName(),
                                              env.currentLine, /*column = */ 0,
                                              msg);
                m_currentDoc->addDiagnosticMessage(d);
                //qWarning() << "file not found:" << fileName << m_currentDoc->fileName() << env.current_line;
            }
        }

        if (! contents.isEmpty()) {
            Document::Ptr cachedDoc = m_documents.value(fileName);
            if (cachedDoc && m_currentDoc) {
                mergeEnvironment(cachedDoc);
            } else {
                Document::Ptr previousDoc = switchDocument(Document::create(fileName));

                const QByteArray previousFile = env.current_file;
                const unsigned previousLine = env.currentLine;

                env.current_file = QByteArray(m_currentDoc->translationUnit()->fileName(),
                                              m_currentDoc->translationUnit()->fileNameLength());

                QByteArray preprocessedCode;
                m_proc(contents, &preprocessedCode);
                //qDebug() << preprocessedCode;

                env.current_file = previousFile;
                env.currentLine = previousLine;

                m_currentDoc->setSource(preprocessedCode);
                m_currentDoc->parse();
                m_currentDoc->check();
                m_currentDoc->releaseTranslationUnit(); // release the AST and the token stream.

                if (m_modelManager)
                    m_modelManager->emitDocumentUpdated(m_currentDoc);
                (void) switchDocument(previousDoc);
            }
        }
    }

    Document::Ptr switchDocument(Document::Ptr doc)
    {
        Document::Ptr previousDoc = m_currentDoc;
        m_currentDoc = doc;
        return previousDoc;
    }

private:
    QPointer<CppModelManager> m_modelManager;
    CppModelManager::DocumentTable m_documents;
    rpp::Environment env;
    rpp::pp m_proc;
    QStringList m_includePaths;
    QStringList m_systemIncludePaths;
    QMap<QString, QByteArray> m_workingCopy;
    QStringList m_projectFiles;
    QStringList m_frameworkPaths;
    QSet<QString> m_included;
    Document::Ptr m_currentDoc;
};

} // namespace Internal
} // namespace CppTools


using namespace CppTools;
using namespace CppTools::Internal;

/*!
    \class CppTools::CppModelManager
    \brief The CppModelManager keeps track of one CppCodeModel instance
           for each project and all related CppCodeModelPart instances.

    It also takes care of updating the code models when C++ files are
    modified within Workbench.
*/

CppModelManager::CppModelManager(QObject *parent) :
    CppModelManagerInterface(parent),
    m_core(ExtensionSystem::PluginManager::instance()->getObject<Core::ICore>())
{
    m_projectExplorer = ExtensionSystem::PluginManager::instance()
                        ->getObject<ProjectExplorer::ProjectExplorerPlugin>();

    Q_ASSERT(m_projectExplorer);

    ProjectExplorer::SessionManager *session = m_projectExplorer->session();
    Q_ASSERT(session != 0);

    connect(session, SIGNAL(aboutToRemoveProject(ProjectExplorer::Project *)),
            this, SLOT(onAboutToRemoveProject(ProjectExplorer::Project *)));

    connect(session, SIGNAL(sessionUnloaded()),
            this, SLOT(onSessionUnloaded()));

    qRegisterMetaType<CPlusPlus::Document::Ptr>("CPlusPlus::Document::Ptr");

    // thread connections
    connect(this, SIGNAL(documentUpdated(CPlusPlus::Document::Ptr)),
            this, SLOT(onDocumentUpdated(CPlusPlus::Document::Ptr)));

    m_hoverHandler = new CppHoverHandler(this, this);

    // Listen for editor closed and opened events so that we can keep track of changing files
    connect(m_core->editorManager(), SIGNAL(editorOpened(Core::IEditor *)),
        this, SLOT(editorOpened(Core::IEditor *)));

    connect(m_core->editorManager(), SIGNAL(editorAboutToClose(Core::IEditor *)),
        this, SLOT(editorAboutToClose(Core::IEditor *)));
}

CppModelManager::~CppModelManager()
{ }

Document::Ptr CppModelManager::document(const QString &fileName)
{ return m_documents.value(fileName); }

CppModelManager::DocumentTable CppModelManager::documents()
{ return m_documents; }

QStringList CppModelManager::projectFiles() const
{
    QStringList files;
    QMapIterator<ProjectExplorer::Project *, ProjectInfo> it(m_projects);
    while (it.hasNext()) {
        it.next();
        ProjectInfo pinfo = it.value();
        files += pinfo.sourceFiles;
    }
    return files;
}

QStringList CppModelManager::includePaths() const
{
    QStringList includePaths;
    QMapIterator<ProjectExplorer::Project *, ProjectInfo> it(m_projects);
    while (it.hasNext()) {
        it.next();
        ProjectInfo pinfo = it.value();
        includePaths += pinfo.includePaths;
    }
    return includePaths;
}

QStringList CppModelManager::frameworkPaths() const
{
    QStringList frameworkPaths;
    QMapIterator<ProjectExplorer::Project *, ProjectInfo> it(m_projects);
    while (it.hasNext()) {
        it.next();
        ProjectInfo pinfo = it.value();
        frameworkPaths += pinfo.frameworkPaths;
    }
    return frameworkPaths;
}

QByteArray CppModelManager::definedMacros() const
{
    QByteArray macros;
    QMapIterator<ProjectExplorer::Project *, ProjectInfo> it(m_projects);
    while (it.hasNext()) {
        it.next();
        ProjectInfo pinfo = it.value();
        macros += pinfo.defines;
    }
    return macros;
}

QMap<QString, QByteArray> CppModelManager::buildWorkingCopyList() const
{
    QMap<QString, QByteArray> workingCopy;
    QMapIterator<TextEditor::ITextEditor *, CppEditorSupport *> it(m_editorSupport);
    while (it.hasNext()) {
        it.next();
        TextEditor::ITextEditor *textEditor = it.key();
        CppEditorSupport *editorSupport = it.value();
        QString fileName = textEditor->file()->fileName();
        workingCopy[fileName] = editorSupport->contents().toUtf8();
    }

    // add the project configuration file
    QByteArray conf(pp_configuration);
    conf += definedMacros();
    workingCopy[pp_configuration_file] = conf;

    return workingCopy;
}

void CppModelManager::updateSourceFiles(const QStringList &sourceFiles)
{ (void) refreshSourceFiles(sourceFiles); }

CppModelManager::ProjectInfo *CppModelManager::projectInfo(ProjectExplorer::Project *project)
{ return &m_projects[project]; }

QFuture<void> CppModelManager::refreshSourceFiles(const QStringList &sourceFiles)
{
    if (qgetenv("QTCREATOR_NO_CODE_INDEXER").isNull()) {
        const QMap<QString, QByteArray> workingCopy = buildWorkingCopyList();

        QFuture<void> result = QtConcurrent::run(&CppModelManager::parse, this,
                                                 sourceFiles, workingCopy);

        if (sourceFiles.count() > 1) {
            m_core->progressManager()->addTask(result, tr("Indexing"),
                            CppTools::Constants::TASK_INDEX,
                            Core::ProgressManagerInterface::CloseOnSuccess);
        }
        return result;
    }
    return QFuture<void>();
}

/*!
    \fn    void CppModelManager::editorOpened(Core::IEditor *editor)
    \brief If a C++ editor is opened, the model manager listens to content changes
           in order to update the CppCodeModel accordingly. It also updates the
           CppCodeModel for the first time with this editor.

    \sa    void CppModelManager::editorContentsChanged()
 */
void CppModelManager::editorOpened(Core::IEditor *editor)
{
    if (isCppEditor(editor)) {
        TextEditor::ITextEditor *textEditor = qobject_cast<TextEditor::ITextEditor *>(editor);
        Q_ASSERT(textEditor != 0);

        CppEditorSupport *editorSupport = new CppEditorSupport(this);
        editorSupport->setTextEditor(textEditor);
        m_editorSupport[textEditor] = editorSupport;

        // ### move in CppEditorSupport
        connect(editor, SIGNAL(tooltipRequested(TextEditor::ITextEditor*, QPoint, int)),
                m_hoverHandler, SLOT(showToolTip(TextEditor::ITextEditor*, QPoint, int)));

        // ### move in CppEditorSupport
        connect(editor, SIGNAL(contextHelpIdRequested(TextEditor::ITextEditor*, int)),
                m_hoverHandler, SLOT(updateContextHelpId(TextEditor::ITextEditor*, int)));
    }
}

void CppModelManager::editorAboutToClose(Core::IEditor *editor)
{
    if (isCppEditor(editor)) {
        TextEditor::ITextEditor *textEditor = qobject_cast<TextEditor::ITextEditor *>(editor);
        Q_ASSERT(textEditor != 0);

        CppEditorSupport *editorSupport = m_editorSupport.value(textEditor);
        m_editorSupport.remove(textEditor);
        delete editorSupport;
    }
}

bool CppModelManager::isCppEditor(Core::IEditor *editor) const
{
    Core::UniqueIDManager *uidm = m_core->uniqueIDManager();
    const int uid = uidm->uniqueIdentifier(ProjectExplorer::Constants::LANG_CXX);
    return editor->context().contains(uid);
}

void CppModelManager::emitDocumentUpdated(Document::Ptr doc)
{ emit documentUpdated(doc); }

void CppModelManager::onDocumentUpdated(Document::Ptr doc)
{
    const QString fileName = doc->fileName();
    m_documents[fileName] = doc;
    QList<Core::IEditor *> openedEditors = m_core->editorManager()->openedEditors();
    foreach (Core::IEditor *editor, openedEditors) {
        if (editor->file()->fileName() == fileName) {
            TextEditor::ITextEditor *textEditor = qobject_cast<TextEditor::ITextEditor *>(editor);
            if (! textEditor)
                continue;

            TextEditor::BaseTextEditor *ed = qobject_cast<TextEditor::BaseTextEditor *>(textEditor->widget());
            if (! ed)
                continue;

            QList<TextEditor::BaseTextEditor::BlockRange> blockRanges;

            foreach (const Document::Block block, doc->skippedBlocks()) {
                blockRanges.append(TextEditor::BaseTextEditor::BlockRange(block.begin(), block.end()));
            }
            ed->setIfdefedOutBlocks(blockRanges);

            QList<QTextEdit::ExtraSelection> selections;

            // set up the format for the errors
            QTextCharFormat errorFormat;
            errorFormat.setUnderlineStyle(QTextCharFormat::WaveUnderline);
            errorFormat.setUnderlineColor(Qt::red);

            // set up the format for the warnings.
            QTextCharFormat warningFormat;
            warningFormat.setUnderlineStyle(QTextCharFormat::WaveUnderline);
            warningFormat.setUnderlineColor(Qt::darkYellow);

            QSet<int> lines;
            foreach (const Document::DiagnosticMessage m, doc->diagnosticMessages()) {
                if (m.fileName() != fileName)
                    continue;
                else if (lines.contains(m.line()))
                    continue;
                else if (lines.size() == MAX_SELECTION_COUNT)
                    break; // we're done.

                lines.insert(m.line());

                QTextEdit::ExtraSelection sel;
                if (m.isWarning())
                    sel.format = warningFormat;
                else
                    sel.format = errorFormat;

                QTextCursor c(ed->document()->findBlockByNumber(m.line() - 1));
                const QString text = c.block().text();
                for (int i = 0; i < text.size(); ++i) {
                    if (! text.at(i).isSpace()) {
                        c.setPosition(c.position() + i);
                        break;
                    }
                }
                c.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
                sel.cursor = c;
                selections.append(sel);
            }
            ed->setExtraExtraSelections(selections);
            break;
        }
    }
}

void CppModelManager::onAboutToRemoveProject(ProjectExplorer::Project *project)
{
    m_projects.remove(project);
    GC();
}

void CppModelManager::onSessionUnloaded()
{
    if (m_core->progressManager())
        m_core->progressManager()->cancelTasks(CppTools::Constants::TASK_INDEX);
}

void CppModelManager::parse(QFutureInterface<void> &future,
                            CppModelManager *model,
                            QStringList files,
                            QMap<QString, QByteArray> workingCopy)
{
    // Change the priority of the background parser thread to idle.
    QThread::currentThread()->setPriority(QThread::IdlePriority);

    future.setProgressRange(0, files.size());

    CppPreprocessor preproc(model);
    preproc.setWorkingCopy(workingCopy);
    preproc.setProjectFiles(model->projectFiles());
    preproc.setIncludePaths(model->includePaths());
    preproc.setFrameworkPaths(model->frameworkPaths());

    QString conf = QLatin1String(pp_configuration_file);
    (void) preproc(conf);

    const int STEP = 10;

    for (int i = 0; i < files.size(); ++i) {
        if (future.isPaused())
            future.waitForResume();

        if (future.isCanceled())
            break;

        future.setProgressValue(i);

#ifdef CPPTOOLS_DEBUG_PARSING_TIME
        QTime tm;
        tm.start();
#endif

        QString fileName = files.at(i);
        preproc(fileName);

        if (! (i % STEP)) // Yields execution of the current thread.
            QThread::yieldCurrentThread();

#ifdef CPPTOOLS_DEBUG_PARSING_TIME
        qDebug() << fileName << "parsed in:" << tm.elapsed();
#endif
    }

    // Restore the previous thread priority.
    QThread::currentThread()->setPriority(QThread::NormalPriority);
}

void CppModelManager::GC()
{
    DocumentTable documents = m_documents;

    QSet<QString> processed;
    QStringList todo = m_projectFiles;

    while (! todo.isEmpty()) {
        QString fn = todo.last();
        todo.removeLast();

        if (processed.contains(fn))
            continue;

        processed.insert(fn);

        if (Document::Ptr doc = documents.value(fn)) {
            todo += doc->includedFiles();
        }
    }

    QStringList removedFiles;
    QMutableMapIterator<QString, Document::Ptr> it(documents);
    while (it.hasNext()) {
        it.next();
        const QString fn = it.key();
        if (! processed.contains(fn)) {
            removedFiles.append(fn);
            it.remove();
        }
    }

    emit aboutToRemoveFiles(removedFiles);
    m_documents = documents;
}