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/*
* Copyright (C) 2007-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "JSDOMBinding.h"
#include "ScriptExecutionContext.h"
#include <JavaScriptCore/JSObject.h>
#include <JavaScriptCore/Weak.h>
#include <JavaScriptCore/WeakInlines.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Threading.h>
namespace WebCore {
template<typename ImplementationClass> struct JSDOMCallbackConverterTraits;
// We have to clean up this data on the context thread because unprotecting a
// JSObject on the wrong thread without synchronization would corrupt the heap
// (and synchronization would be slow).
class JSCallbackData {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(JSCallbackData, WEBCORE_EXPORT);
public:
enum class CallbackType { Function, Object, FunctionOrObject };
JSCallbackData(JSC::JSObject* callback, JSDOMGlobalObject* globalObject, void* owner)
: m_globalObject(globalObject)
, m_callback(callback, &m_weakOwner, owner)
{
}
~JSCallbackData()
{
#if !PLATFORM(IOS_FAMILY)
ASSERT(m_thread.ptr() == &Thread::current());
#endif
}
JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
JSC::JSObject* callback() { return m_callback.get(); }
template<typename Visitor> void visitJSFunction(Visitor&);
WEBCORE_EXPORT static JSC::JSValue invokeCallback(JSDOMGlobalObject&, JSC::JSObject* callback, JSC::JSValue thisValue, JSC::MarkedArgumentBuffer&, CallbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException);
JSC::JSValue invokeCallback(JSC::JSValue thisValue, JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
{
auto* globalObject = this->globalObject();
if (!globalObject)
return { };
return JSCallbackData::invokeCallback(*globalObject, callback(), thisValue, args, callbackType, functionName, returnedException);
}
private:
JSC::Weak<JSDOMGlobalObject> m_globalObject;
class WeakOwner : public JSC::WeakHandleOwner {
bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* owner, JSC::AbstractSlotVisitor& visitor, ASCIILiteral* reason) override
{
if (UNLIKELY(reason))
*reason = "Callback owner is an opaque root"_s;
return visitor.containsOpaqueRoot(owner);
}
};
WeakOwner m_weakOwner;
JSC::Weak<JSC::JSObject> m_callback;
#if ASSERT_ENABLED
Ref<Thread> m_thread { Thread::current() };
#endif
};
class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
public:
template <typename CallbackDataType>
explicit DeleteCallbackDataTask(CallbackDataType* data)
: ScriptExecutionContext::Task(ScriptExecutionContext::Task::CleanupTask, [data = std::unique_ptr<CallbackDataType>(data)] (ScriptExecutionContext&) {
})
{
}
};
} // namespace WebCore
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