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 "JSAPIWrapperObject.h" 28 29#include "DelayedReleaseScope.h" 30#include "JSCInlines.h" 31#include "JSCallbackObject.h" 32#include "JSVirtualMachineInternal.h" 33#include "Structure.h" 34 35#if JSC_OBJC_API_ENABLED 36 37class JSAPIWrapperObjectHandleOwner : public JSC::WeakHandleOwner { 38public: 39 virtual void finalize(JSC::Handle<JSC::Unknown>, void*) override; 40 virtual bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor&) override; 41}; 42 43static JSAPIWrapperObjectHandleOwner* jsAPIWrapperObjectHandleOwner() 44{ 45 DEPRECATED_DEFINE_STATIC_LOCAL(JSAPIWrapperObjectHandleOwner, jsWrapperObjectHandleOwner, ()); 46 return &jsWrapperObjectHandleOwner; 47} 48 49void JSAPIWrapperObjectHandleOwner::finalize(JSC::Handle<JSC::Unknown> handle, void*) 50{ 51 JSC::JSAPIWrapperObject* wrapperObject = JSC::jsCast<JSC::JSAPIWrapperObject*>(handle.get().asCell()); 52 if (!wrapperObject->wrappedObject()) 53 return; 54 55 JSC::Heap::heap(wrapperObject)->releaseSoon(adoptNS(static_cast<id>(wrapperObject->wrappedObject()))); 56 JSC::WeakSet::deallocate(JSC::WeakImpl::asWeakImpl(handle.slot())); 57} 58 59bool JSAPIWrapperObjectHandleOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, JSC::SlotVisitor& visitor) 60{ 61 JSC::JSAPIWrapperObject* wrapperObject = JSC::jsCast<JSC::JSAPIWrapperObject*>(handle.get().asCell()); 62 // We use the JSGlobalObject when processing weak handles to prevent the situation where using 63 // the same Objective-C object in multiple global objects keeps all of the global objects alive. 64 if (!wrapperObject->wrappedObject()) 65 return false; 66 return JSC::Heap::isMarked(wrapperObject->structure()->globalObject()) && visitor.containsOpaqueRoot(wrapperObject->wrappedObject()); 67} 68 69namespace JSC { 70 71template <> const ClassInfo JSCallbackObject<JSAPIWrapperObject>::s_info = { "JSAPIWrapperObject", &Base::s_info, 0, 0, CREATE_METHOD_TABLE(JSCallbackObject) }; 72 73template<> const bool JSCallbackObject<JSAPIWrapperObject>::needsDestruction = true; 74 75template <> 76Structure* JSCallbackObject<JSAPIWrapperObject>::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) 77{ 78 return Structure::create(vm, globalObject, proto, TypeInfo(ObjectType, StructureFlags), &s_info); 79} 80 81JSAPIWrapperObject::JSAPIWrapperObject(VM& vm, Structure* structure) 82 : Base(vm, structure) 83 , m_wrappedObject(0) 84{ 85} 86 87void JSAPIWrapperObject::finishCreation(VM& vm) 88{ 89 Base::finishCreation(vm); 90 WeakSet::allocate(this, jsAPIWrapperObjectHandleOwner(), 0); // Balanced in JSAPIWrapperObjectHandleOwner::finalize. 91} 92 93void JSAPIWrapperObject::setWrappedObject(void* wrappedObject) 94{ 95 ASSERT(!m_wrappedObject); 96 m_wrappedObject = [static_cast<id>(wrappedObject) retain]; 97} 98 99void JSAPIWrapperObject::visitChildren(JSCell* cell, JSC::SlotVisitor& visitor) 100{ 101 JSAPIWrapperObject* thisObject = JSC::jsCast<JSAPIWrapperObject*>(cell); 102 COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag); 103 Base::visitChildren(cell, visitor); 104 105 if (thisObject->wrappedObject()) 106 scanExternalObjectGraph(cell->structure()->globalObject()->vm(), visitor, thisObject->wrappedObject()); 107} 108 109} // namespace JSC 110 111#endif // JSC_OBJC_API_ENABLED 112