scheduledaction.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 *  Copyright (C) 2000 Harri Porten ([e-mail])
 *  Copyright (C) 2006 Jon Shier ([e-mail])
 *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reseved.
 *  Copyright (C) 2006 Alexey Proskuryakov ([e-mail])
 *  Copyright (C) 2009 Google Inc. All rights reseved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 *  USA
 */

#include "config.h"
#include "ScheduledAction.h"

#include "CString.h"
#include "DOMWindow.h"
#include "Document.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "JSDOMBinding.h"
#include "JSDOMWindow.h"
#include "JSWorkerContext.h"
#include "ScriptController.h"
#include "ScriptExecutionContext.h"
#include "ScriptSourceCode.h"
#include "ScriptValue.h"
#include "WorkerContext.h"
#include "WorkerThread.h"
#include <runtime/JSLock.h>

using namespace JSC;

namespace WebCore {

ScheduledAction::ScheduledAction(ExecState* exec, JSValuePtr function, const ArgList& args)
    : m_function(function)
{
    ArgList::const_iterator end = args.end();
    for (ArgList::const_iterator it = args.begin(); it != end; ++it) {
        m_args.append((*it).jsValue(exec));
    }
}

void ScheduledAction::execute(ScriptExecutionContext* context)
{
    if (context->isDocument())
        execute(static_cast<Document*>(context));
#if ENABLE(WORKERS)
    else {
        ASSERT(context->isWorkerContext());
        execute(static_cast<WorkerContext*>(context));
    }
#else
    ASSERT(context->isDocument());
#endif
}

void ScheduledAction::executeFunctionInContext(JSGlobalObject* globalObject, JSValuePtr thisValue)
{
    ASSERT(m_function);
    JSLock lock(false);

    CallData callData;
    CallType callType = m_function.get().getCallData(callData);
    if (callType == CallTypeNone)
        return;

    ExecState* exec = globalObject->globalExec();

    ArgList args;
    size_t size = m_args.size();
    for (size_t i = 0; i < size; ++i)
        args.append(m_args[i]);

    globalObject->globalData()->timeoutChecker.start();
    call(exec, m_function, callType, callData, thisValue, args);
    globalObject->globalData()->timeoutChecker.stop();

    if (exec->hadException())
        reportCurrentException(exec);
}

#if ENABLE(WORKERS)
void ScheduledAction::execute(WorkerContext* workerContext)
{
    // In a Worker, the execution should always happen on a worker thread.
    ASSERT(workerContext->thread()->threadID() == currentThread());

    WorkerScriptController* scriptController = workerContext->script();

    if (m_function) {
        JSWorkerContext* contextWrapper = scriptController->workerContextWrapper();
        executeFunctionInContext(contextWrapper, contextWrapper);
    } else {
        ScriptSourceCode code(m_code, workerContext->url());
        scriptController->evaluate(code);
    }
}
#endif // ENABLE(WORKERS)

void ScheduledAction::execute(Document* document)
{
    JSDOMWindow* window = toJSDOMWindow(document->frame());
    if (!window)
        return;

    RefPtr<Frame> frame = window->impl()->frame();
    if (!frame || !frame->script()->isEnabled())
        return;

    frame->script()->setProcessingTimerCallback(true);

    if (m_function)
        executeFunctionInContext(window, window->shell());
    else
        frame->loader()->executeScript(m_code);

    // Update our document's rendering following the execution of the timeout callback.
    // FIXME: Why not use updateDocumentsRendering to update rendering of all documents?
    // FIXME: Is this really the right point to do the update? We need a place that works
    // for all possible entry points that might possibly execute script, but this seems
    // to be a bit too low-level.
    frame->document()->updateRendering();

    frame->script()->setProcessingTimerCallback(false);
}

} // namespace WebCore