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Diffstat (limited to 'src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp')
| -rw-r--r-- | src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp b/src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp new file mode 100644 index 0000000..d35a86b --- /dev/null +++ b/src/scripttools/debugging/qscriptenginedebuggerfrontend.cpp @@ -0,0 +1,335 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtSCriptTools module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 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 the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qscriptenginedebuggerfrontend_p.h" +#include "qscriptdebuggerfrontend_p_p.h" +#include "qscriptdebuggerbackend_p.h" +#include "qscriptdebuggerbackend_p_p.h" +#include "qscriptdebuggerevent_p.h" +#include "qscriptdebuggercommandexecutor_p.h" +#include "qscriptdebuggerresponse_p.h" + +#include <QtCore/qcoreapplication.h> +#include <QtCore/qeventloop.h> +#include <QtCore/qlist.h> +#include <QtScript/qscriptvalue.h> + +QT_BEGIN_NAMESPACE + +/*! + \class QScriptEngineDebuggerFrontend + \since 4.5 + \internal + + \brief The QScriptEngineDebuggerFrontend class provides an in-process debugger frontend. + + This type of frontend is used when the QScriptEngine being debugged + lives in the same process as the debugger. + + Call the attachTo() function to attach to an engine. +*/ + +class QScriptDebuggerCommandEvent : public QEvent +{ +public: + QScriptDebuggerCommandEvent(int id, const QScriptDebuggerCommand &command) + : QEvent(QEvent::Type(QEvent::User+3)), m_id(id), m_command(command) {} + ~QScriptDebuggerCommandEvent() {} + int id() const + { return m_id; } + const QScriptDebuggerCommand &command() const + { return m_command; } +private: + int m_id; + QScriptDebuggerCommand m_command; +}; + +class QScriptDebuggerCommandFinishedEvent : public QEvent +{ +public: + QScriptDebuggerCommandFinishedEvent(int id, const QScriptDebuggerResponse &response) + : QEvent(QEvent::Type(QEvent::User+4)), m_id(id), m_response(response) {} + ~QScriptDebuggerCommandFinishedEvent() {} + int id() const + { return m_id; } + const QScriptDebuggerResponse &response() const + { return m_response; } +private: + int m_id; + QScriptDebuggerResponse m_response; +}; + +class QScriptEngineDebuggerBackendPrivate; +class QScriptEngineDebuggerBackend : public QScriptDebuggerBackend +{ +public: + QScriptEngineDebuggerBackend(QScriptEngineDebuggerFrontendPrivate *frontend); + ~QScriptEngineDebuggerBackend(); + + void processCommand(int id, const QScriptDebuggerCommand &command); + void resume(); + +protected: + void event(const QScriptDebuggerEvent &event); + +private: + Q_DECLARE_PRIVATE(QScriptEngineDebuggerBackend) + Q_DISABLE_COPY(QScriptEngineDebuggerBackend) +}; + +class QScriptEngineDebuggerBackendPrivate + : public QScriptDebuggerBackendPrivate +{ + Q_DECLARE_PUBLIC(QScriptEngineDebuggerBackend) +public: + QScriptEngineDebuggerBackendPrivate(); + ~QScriptEngineDebuggerBackendPrivate(); + + bool event(QEvent *e); + + QScriptEngineDebuggerFrontendPrivate *frontend; + QList<QEventLoop*> eventLoopPool; + QList<QEventLoop*> eventLoopStack; +}; + +class QScriptEngineDebuggerFrontendPrivate + : public QScriptDebuggerFrontendPrivate +{ + Q_DECLARE_PUBLIC(QScriptEngineDebuggerFrontend) +public: + QScriptEngineDebuggerFrontendPrivate(); + ~QScriptEngineDebuggerFrontendPrivate(); + + void postCommandFinished(int id, const QScriptDebuggerResponse &response); + bool event(QEvent *e); + + QScriptEngineDebuggerBackend *backend; +}; + +QScriptEngineDebuggerBackendPrivate::QScriptEngineDebuggerBackendPrivate() +{ + frontend = 0; +} + +QScriptEngineDebuggerBackendPrivate::~QScriptEngineDebuggerBackendPrivate() +{ + eventLoopPool << eventLoopStack; + eventLoopStack.clear(); + while (!eventLoopPool.isEmpty()) { + QEventLoop *eventLoop = eventLoopPool.takeFirst(); + if (eventLoop->isRunning()) { + eventLoop->quit(); + eventLoop->deleteLater(); + } else { + delete eventLoop; + } + } +} + +/*! + \reimp +*/ +bool QScriptEngineDebuggerBackendPrivate::event(QEvent *e) +{ + Q_Q(QScriptEngineDebuggerBackend); + if (e->type() == QEvent::User+3) { + QScriptDebuggerCommandEvent *ce = static_cast<QScriptDebuggerCommandEvent*>(e); + QScriptDebuggerCommandExecutor *executor = q->commandExecutor(); + QScriptDebuggerResponse response = executor->execute(q, ce->command()); + frontend->postCommandFinished(ce->id(), response); + return true; + } + return QScriptDebuggerBackendPrivate::event(e); +} + +/*! + \internal + + Creates a new QScriptEngineDebuggerBackend object for the given \a + engine. The back-end will forward events to the given \a frontend. +*/ +QScriptEngineDebuggerBackend::QScriptEngineDebuggerBackend( + QScriptEngineDebuggerFrontendPrivate *frontend) + : QScriptDebuggerBackend(*new QScriptEngineDebuggerBackendPrivate) +{ + Q_D(QScriptEngineDebuggerBackend); + d->frontend = frontend; +} + +QScriptEngineDebuggerBackend::~QScriptEngineDebuggerBackend() +{ +} + +void QScriptEngineDebuggerBackend::processCommand(int id, const QScriptDebuggerCommand &command) +{ + Q_D(QScriptEngineDebuggerBackend); + d->postEvent(new QScriptDebuggerCommandEvent(id, command)); +} + +/*! + \reimp +*/ +void QScriptEngineDebuggerBackend::event(const QScriptDebuggerEvent &event) +{ + Q_D(QScriptEngineDebuggerBackend); + if (d->eventLoopPool.isEmpty()) + d->eventLoopPool.append(new QEventLoop()); + QEventLoop *eventLoop = d->eventLoopPool.takeFirst(); + Q_ASSERT(!eventLoop->isRunning()); + d->eventLoopStack.prepend(eventLoop); + + d->frontend->postEvent(new QScriptDebuggerEventEvent(event)); + + // Run an event loop until resume() is called. + // This effectively stalls script execution and makes it possible + // for the debugger to inspect the execution state in the meantime. + eventLoop->exec(); + + if (!d->eventLoopStack.isEmpty()) { + // the event loop was quit directly (i.e. not via resume()) + d->eventLoopStack.takeFirst(); + } + d->eventLoopPool.append(eventLoop); + doPendingEvaluate(/*postEvent=*/false); +} + +/*! + \reimp +*/ +void QScriptEngineDebuggerBackend::resume() +{ + Q_D(QScriptEngineDebuggerBackend); + // quitting the event loops will cause event() to return (see above) + while (!d->eventLoopStack.isEmpty()) { + QEventLoop *eventLoop = d->eventLoopStack.takeFirst(); + if (eventLoop->isRunning()) + eventLoop->quit(); + } +} + +QScriptEngineDebuggerFrontendPrivate::QScriptEngineDebuggerFrontendPrivate() +{ + backend = 0; +} + +QScriptEngineDebuggerFrontendPrivate::~QScriptEngineDebuggerFrontendPrivate() +{ + delete backend; +} + +void QScriptEngineDebuggerFrontendPrivate::postCommandFinished( + int id, const QScriptDebuggerResponse &response) +{ + postEvent(new QScriptDebuggerCommandFinishedEvent(id, response)); +} + +/*! + \reimp +*/ +bool QScriptEngineDebuggerFrontendPrivate::event(QEvent *e) +{ + Q_Q(QScriptEngineDebuggerFrontend); + if (e->type() == QEvent::User+4) { + QScriptDebuggerCommandFinishedEvent *fe = static_cast<QScriptDebuggerCommandFinishedEvent*>(e); + q->notifyCommandFinished(fe->id(), fe->response()); + return true; + } + return QScriptDebuggerFrontendPrivate::event(e); +} + +QScriptEngineDebuggerFrontend::QScriptEngineDebuggerFrontend() + : QScriptDebuggerFrontend(*new QScriptEngineDebuggerFrontendPrivate) +{ +} + +QScriptEngineDebuggerFrontend::~QScriptEngineDebuggerFrontend() +{ + detach(); +} + +/*! + Attaches this front-end to the given \a engine. +*/ +void QScriptEngineDebuggerFrontend::attachTo(QScriptEngine *engine) +{ + Q_D(QScriptEngineDebuggerFrontend); + if (d->backend) + d->backend->detach(); + else + d->backend = new QScriptEngineDebuggerBackend(d); + d->backend->attachTo(engine); +} + +/*! + Detaches this front-end from the current script engine. +*/ +void QScriptEngineDebuggerFrontend::detach() +{ + Q_D(QScriptEngineDebuggerFrontend); + if (d->backend) + d->backend->detach(); +} + +QScriptValue QScriptEngineDebuggerFrontend::traceFunction() const +{ + Q_D(const QScriptEngineDebuggerFrontend); + if (d->backend) + d->backend->traceFunction(); + return QScriptValue(); +} + +QScriptDebuggerBackend *QScriptEngineDebuggerFrontend::backend() const +{ + Q_D(const QScriptEngineDebuggerFrontend); + return d->backend; +} + +/*! + \reimp +*/ +void QScriptEngineDebuggerFrontend::processCommand(int id, const QScriptDebuggerCommand &command) +{ + Q_D(QScriptEngineDebuggerFrontend); + Q_ASSERT(d->backend != 0); + d->backend->processCommand(id, command); +} + +QT_END_NAMESPACE |