1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "JSDOMGlobalObjectTask.h"
28
29#include "ActiveDOMCallback.h"
30#include "JSMainThreadExecState.h"
31#include <heap/StrongInlines.h>
32#include <runtime/Microtask.h>
33#include <wtf/Ref.h>
34
35using namespace JSC;
36
37namespace WebCore {
38
39class JSGlobalObjectCallback final : public RefCounted<JSGlobalObjectCallback>, private ActiveDOMCallback {
40public:
41    static PassRefPtr<JSGlobalObjectCallback> create(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task)
42    {
43        return adoptRef(new JSGlobalObjectCallback(globalObject, task));
44    }
45
46    void call()
47    {
48        if (!canInvokeCallback())
49            return;
50
51        Ref<JSGlobalObjectCallback> protect(*this);
52        JSLockHolder lock(m_globalObject->vm());
53
54        ExecState* exec = m_globalObject->globalExec();
55
56        ScriptExecutionContext* context = m_globalObject->scriptExecutionContext();
57        // We will fail to get the context if the frame has been detached.
58        if (!context)
59            return;
60
61        // When on the main thread (e.g. the document's thread), we need to make sure to
62        // push the current ExecState on to the JSMainThreadExecState stack.
63        if (context->isDocument())
64            JSMainThreadExecState::runTask(exec, *m_task.get());
65        else
66            m_task->run(exec);
67        ASSERT(!exec->hadException());
68    }
69
70private:
71    JSGlobalObjectCallback(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task)
72        : ActiveDOMCallback(globalObject->scriptExecutionContext())
73        , m_globalObject(globalObject->vm(), globalObject)
74        , m_task(task)
75    {
76    }
77
78    Strong<JSDOMGlobalObject> m_globalObject;
79    RefPtr<Microtask> m_task;
80};
81
82JSGlobalObjectTask::JSGlobalObjectTask(JSDOMGlobalObject* globalObject, PassRefPtr<Microtask> task)
83    : ScriptExecutionContext::Task(nullptr)
84{
85    RefPtr<JSGlobalObjectCallback> callback = JSGlobalObjectCallback::create(globalObject, task);
86    m_task = [=] (ScriptExecutionContext&) {
87        callback->call();
88    };
89}
90
91} // namespace WebCore
92