1/*
2 * Copyright (C) 2018 Igalia S.L.
3 * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "JSAPIWrapperObject.h"
29
30#include "JSCGLibWrapperObject.h"
31#include "JSCInlines.h"
32#include "JSCallbackObject.h"
33#include "Structure.h"
34#include <wtf/NeverDestroyed.h>
35
36class JSAPIWrapperObjectHandleOwner : public JSC::WeakHandleOwner {
37public:
38 void finalize(JSC::Handle<JSC::Unknown>, void*) override;
39 bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor&, const char**) override;
40};
41
42static JSAPIWrapperObjectHandleOwner* jsAPIWrapperObjectHandleOwner()
43{
44 static NeverDestroyed<JSAPIWrapperObjectHandleOwner> jsWrapperObjectHandleOwner;
45 return &jsWrapperObjectHandleOwner.get();
46}
47
48void JSAPIWrapperObjectHandleOwner::finalize(JSC::Handle<JSC::Unknown> handle, void*)
49{
50 auto* wrapperObject = static_cast<JSC::JSAPIWrapperObject*>(handle.get().asCell());
51 if (!wrapperObject->wrappedObject())
52 return;
53
54 JSC::Heap::heap(wrapperObject)->releaseSoon(std::unique_ptr<JSC::JSCGLibWrapperObject>(static_cast<JSC::JSCGLibWrapperObject*>(wrapperObject->wrappedObject())));
55 JSC::WeakSet::deallocate(JSC::WeakImpl::asWeakImpl(handle.slot()));
56}
57
58bool JSAPIWrapperObjectHandleOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, JSC::SlotVisitor& visitor, const char**)
59{
60 JSC::JSAPIWrapperObject* wrapperObject = JSC::jsCast<JSC::JSAPIWrapperObject*>(handle.get().asCell());
61 // We use the JSGlobalObject when processing weak handles to prevent the situation where using
62 // the same wrapped object in multiple global objects keeps all of the global objects alive.
63 if (!wrapperObject->wrappedObject())
64 return false;
65 return visitor.vm().heap.isMarked(wrapperObject->structure()->globalObject()) && visitor.containsOpaqueRoot(wrapperObject->wrappedObject());
66}
67
68namespace JSC {
69
70template <> const ClassInfo JSCallbackObject<JSAPIWrapperObject>::s_info = { "JSAPIWrapperObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSCallbackObject) };
71
72template<> const bool JSCallbackObject<JSAPIWrapperObject>::needsDestruction = true;
73
74template <>
75Structure* JSCallbackObject<JSAPIWrapperObject>::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto)
76{
77 return Structure::create(vm, globalObject, proto, TypeInfo(ObjectType, StructureFlags), &s_info);
78}
79
80JSAPIWrapperObject::JSAPIWrapperObject(VM& vm, Structure* structure)
81 : Base(vm, structure)
82{
83}
84
85void JSAPIWrapperObject::finishCreation(VM& vm)
86{
87 Base::finishCreation(vm);
88 WeakSet::allocate(this, jsAPIWrapperObjectHandleOwner(), 0); // Balanced in JSAPIWrapperObjectHandleOwner::finalize.
89}
90
91void JSAPIWrapperObject::setWrappedObject(void* wrappedObject)
92{
93 ASSERT(!m_wrappedObject);
94 m_wrappedObject = wrappedObject;
95}
96
97void JSAPIWrapperObject::visitChildren(JSCell* cell, JSC::SlotVisitor& visitor)
98{
99 Base::visitChildren(cell, visitor);
100}
101
102} // namespace JSC
103