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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtSCriptTools module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qscriptenginedebuggerfrontend_p.h"
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#include "qscriptdebuggerfrontend_p_p.h"
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#include "qscriptdebuggerbackend_p.h"
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#include "qscriptdebuggerbackend_p_p.h"
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#include "qscriptdebuggerevent_p.h"
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#include "qscriptdebuggercommandexecutor_p.h"
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#include "qscriptdebuggerresponse_p.h"
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#include <QtCore/qcoreapplication.h>
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#include <QtCore/qeventloop.h>
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#include <QtCore/qlist.h>
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#include <QtScript/qscriptvalue.h>
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QT_BEGIN_NAMESPACE
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/*!
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\class QScriptEngineDebuggerFrontend
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\since 4.5
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\internal
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\brief The QScriptEngineDebuggerFrontend class provides an in-process debugger frontend.
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This type of frontend is used when the QScriptEngine being debugged
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lives in the same process as the debugger.
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Call the attachTo() function to attach to an engine.
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*/
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class QScriptDebuggerCommandEvent : public QEvent
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{
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public:
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QScriptDebuggerCommandEvent(int id, const QScriptDebuggerCommand &command)
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: QEvent(QEvent::Type(QEvent::User+3)), m_id(id), m_command(command) {}
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~QScriptDebuggerCommandEvent() {}
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int id() const
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{ return m_id; }
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const QScriptDebuggerCommand &command() const
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{ return m_command; }
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private:
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int m_id;
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QScriptDebuggerCommand m_command;
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};
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class QScriptDebuggerCommandFinishedEvent : public QEvent
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{
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public:
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QScriptDebuggerCommandFinishedEvent(int id, const QScriptDebuggerResponse &response)
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: QEvent(QEvent::Type(QEvent::User+4)), m_id(id), m_response(response) {}
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~QScriptDebuggerCommandFinishedEvent() {}
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int id() const
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{ return m_id; }
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const QScriptDebuggerResponse &response() const
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{ return m_response; }
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private:
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int m_id;
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QScriptDebuggerResponse m_response;
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};
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class QScriptEngineDebuggerBackendPrivate;
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class QScriptEngineDebuggerBackend : public QScriptDebuggerBackend
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{
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public:
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QScriptEngineDebuggerBackend(QScriptEngineDebuggerFrontendPrivate *frontend);
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~QScriptEngineDebuggerBackend();
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void processCommand(int id, const QScriptDebuggerCommand &command);
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void resume();
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protected:
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void event(const QScriptDebuggerEvent &event);
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private:
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Q_DECLARE_PRIVATE(QScriptEngineDebuggerBackend)
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Q_DISABLE_COPY(QScriptEngineDebuggerBackend)
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};
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class QScriptEngineDebuggerBackendPrivate
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: public QScriptDebuggerBackendPrivate
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{
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Q_DECLARE_PUBLIC(QScriptEngineDebuggerBackend)
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public:
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QScriptEngineDebuggerBackendPrivate();
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~QScriptEngineDebuggerBackendPrivate();
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bool event(QEvent *e);
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QScriptEngineDebuggerFrontendPrivate *frontend;
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QList<QEventLoop*> eventLoopPool;
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QList<QEventLoop*> eventLoopStack;
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};
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class QScriptEngineDebuggerFrontendPrivate
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: public QScriptDebuggerFrontendPrivate
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{
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Q_DECLARE_PUBLIC(QScriptEngineDebuggerFrontend)
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public:
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QScriptEngineDebuggerFrontendPrivate();
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~QScriptEngineDebuggerFrontendPrivate();
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void postCommandFinished(int id, const QScriptDebuggerResponse &response);
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bool event(QEvent *e);
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QScriptEngineDebuggerBackend *backend;
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};
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QScriptEngineDebuggerBackendPrivate::QScriptEngineDebuggerBackendPrivate()
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{
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frontend = 0;
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}
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QScriptEngineDebuggerBackendPrivate::~QScriptEngineDebuggerBackendPrivate()
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{
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eventLoopPool << eventLoopStack;
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eventLoopStack.clear();
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while (!eventLoopPool.isEmpty()) {
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QEventLoop *eventLoop = eventLoopPool.takeFirst();
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if (eventLoop->isRunning()) {
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eventLoop->quit();
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eventLoop->deleteLater();
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} else {
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delete eventLoop;
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}
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}
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}
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/*!
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\reimp
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*/
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bool QScriptEngineDebuggerBackendPrivate::event(QEvent *e)
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{
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Q_Q(QScriptEngineDebuggerBackend);
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if (e->type() == QEvent::User+3) {
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QScriptDebuggerCommandEvent *ce = static_cast<QScriptDebuggerCommandEvent*>(e);
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QScriptDebuggerCommandExecutor *executor = q->commandExecutor();
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QScriptDebuggerResponse response = executor->execute(q, ce->command());
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frontend->postCommandFinished(ce->id(), response);
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return true;
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}
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return QScriptDebuggerBackendPrivate::event(e);
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}
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/*!
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\internal
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Creates a new QScriptEngineDebuggerBackend object for the given \a
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engine. The back-end will forward events to the given \a frontend.
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*/
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QScriptEngineDebuggerBackend::QScriptEngineDebuggerBackend(
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QScriptEngineDebuggerFrontendPrivate *frontend)
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: QScriptDebuggerBackend(*new QScriptEngineDebuggerBackendPrivate)
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{
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Q_D(QScriptEngineDebuggerBackend);
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d->frontend = frontend;
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}
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QScriptEngineDebuggerBackend::~QScriptEngineDebuggerBackend()
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{
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}
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void QScriptEngineDebuggerBackend::processCommand(int id, const QScriptDebuggerCommand &command)
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{
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Q_D(QScriptEngineDebuggerBackend);
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d->postEvent(new QScriptDebuggerCommandEvent(id, command));
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}
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/*!
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\reimp
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*/
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void QScriptEngineDebuggerBackend::event(const QScriptDebuggerEvent &event)
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{
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Q_D(QScriptEngineDebuggerBackend);
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if (d->eventLoopPool.isEmpty())
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d->eventLoopPool.append(new QEventLoop());
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QEventLoop *eventLoop = d->eventLoopPool.takeFirst();
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Q_ASSERT(!eventLoop->isRunning());
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d->eventLoopStack.prepend(eventLoop);
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d->frontend->postEvent(new QScriptDebuggerEventEvent(event));
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// Run an event loop until resume() is called.
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// This effectively stalls script execution and makes it possible
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// for the debugger to inspect the execution state in the meantime.
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eventLoop->exec();
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if (!d->eventLoopStack.isEmpty()) {
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// the event loop was quit directly (i.e. not via resume())
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d->eventLoopStack.takeFirst();
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}
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d->eventLoopPool.append(eventLoop);
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doPendingEvaluate(/*postEvent=*/false);
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}
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/*!
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\reimp
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*/
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void QScriptEngineDebuggerBackend::resume()
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{
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Q_D(QScriptEngineDebuggerBackend);
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// quitting the event loops will cause event() to return (see above)
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while (!d->eventLoopStack.isEmpty()) {
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QEventLoop *eventLoop = d->eventLoopStack.takeFirst();
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if (eventLoop->isRunning())
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eventLoop->quit();
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}
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}
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QScriptEngineDebuggerFrontendPrivate::QScriptEngineDebuggerFrontendPrivate()
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{
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backend = 0;
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}
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QScriptEngineDebuggerFrontendPrivate::~QScriptEngineDebuggerFrontendPrivate()
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{
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delete backend;
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}
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void QScriptEngineDebuggerFrontendPrivate::postCommandFinished(
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int id, const QScriptDebuggerResponse &response)
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{
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postEvent(new QScriptDebuggerCommandFinishedEvent(id, response));
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}
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/*!
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\reimp
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*/
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bool QScriptEngineDebuggerFrontendPrivate::event(QEvent *e)
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{
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Q_Q(QScriptEngineDebuggerFrontend);
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if (e->type() == QEvent::User+4) {
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QScriptDebuggerCommandFinishedEvent *fe = static_cast<QScriptDebuggerCommandFinishedEvent*>(e);
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q->notifyCommandFinished(fe->id(), fe->response());
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return true;
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}
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return QScriptDebuggerFrontendPrivate::event(e);
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}
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QScriptEngineDebuggerFrontend::QScriptEngineDebuggerFrontend()
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: QScriptDebuggerFrontend(*new QScriptEngineDebuggerFrontendPrivate)
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{
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}
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QScriptEngineDebuggerFrontend::~QScriptEngineDebuggerFrontend()
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{
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detach();
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}
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/*!
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Attaches this front-end to the given \a engine.
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*/
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void QScriptEngineDebuggerFrontend::attachTo(QScriptEngine *engine)
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{
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Q_D(QScriptEngineDebuggerFrontend);
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if (d->backend)
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d->backend->detach();
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else
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d->backend = new QScriptEngineDebuggerBackend(d);
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d->backend->attachTo(engine);
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}
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/*!
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Detaches this front-end from the current script engine.
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*/
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void QScriptEngineDebuggerFrontend::detach()
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{
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Q_D(QScriptEngineDebuggerFrontend);
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if (d->backend)
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d->backend->detach();
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}
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QScriptValue QScriptEngineDebuggerFrontend::traceFunction() const
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{
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Q_D(const QScriptEngineDebuggerFrontend);
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if (d->backend)
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d->backend->traceFunction();
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return QScriptValue();
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}
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QScriptDebuggerBackend *QScriptEngineDebuggerFrontend::backend() const
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{
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Q_D(const QScriptEngineDebuggerFrontend);
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return d->backend;
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}
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/*!
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\internal
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*/
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void QScriptEngineDebuggerFrontend::processCommand(int id, const QScriptDebuggerCommand &command)
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{
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Q_D(QScriptEngineDebuggerFrontend);
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Q_ASSERT(d->backend != 0);
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d->backend->processCommand(id, command);
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}
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QT_END_NAMESPACE
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