1/*
2 * Copyright (C) 2017 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#pragma once
27
28#include "ActiveDOMCallback.h"
29#include "JSDOMGlobalObject.h"
30#include <JavaScriptCore/HeapInlines.h>
31#include <JavaScriptCore/JSCell.h>
32#include <JavaScriptCore/SlotVisitorInlines.h>
33#include <JavaScriptCore/StrongInlines.h>
34
35namespace WebCore {
36
37class WEBCORE_EXPORT DOMGuardedObject : public RefCounted<DOMGuardedObject>, public ActiveDOMCallback {
38public:
39 ~DOMGuardedObject();
40
41 bool isSuspended() const { return !m_guarded || !canInvokeCallback(); } // The wrapper world has gone away or active DOM objects have been suspended.
42
43 void visitAggregate(JSC::SlotVisitor& visitor) { visitor.append(m_guarded); }
44
45 JSC::JSValue guardedObject() const { return m_guarded.get(); }
46 JSDOMGlobalObject* globalObject() const { return m_globalObject.get(); }
47
48 void clear();
49
50protected:
51 DOMGuardedObject(JSDOMGlobalObject&, JSC::JSCell&);
52
53 void contextDestroyed() override;
54 bool isEmpty() { return !m_guarded; }
55
56 JSC::Weak<JSC::JSCell> m_guarded;
57 JSC::Weak<JSDOMGlobalObject> m_globalObject;
58};
59
60template <typename T> class DOMGuarded : public DOMGuardedObject {
61protected:
62 DOMGuarded(JSDOMGlobalObject& globalObject, T& guarded) : DOMGuardedObject(globalObject, guarded) { }
63 T* guarded() const { return JSC::jsDynamicCast<T*>(globalObject()->vm(), guardedObject()); }
64};
65
66} // namespace WebCore
67