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/*
* Copyright (C) 2007-2009, 2015 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.
*/
#ifndef JSCallbackData_h
#define JSCallbackData_h
#include "JSDOMBinding.h"
#include "JSDOMGlobalObject.h"
#include "ScriptExecutionContext.h"
#include <heap/Strong.h>
#include <heap/StrongInlines.h>
#include <runtime/JSObject.h>
#include <wtf/Threading.h>
namespace WebCore {
// 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 {
public:
enum class CallbackType { Function, Object, FunctionOrObject };
protected:
JSCallbackData()
#ifndef NDEBUG
: m_thread(currentThread())
#endif
{
}
~JSCallbackData()
{
#if !PLATFORM(IOS)
ASSERT(m_thread == currentThread());
#endif
}
static JSC::JSValue invokeCallback(JSC::JSObject* callback, JSC::MarkedArgumentBuffer&, CallbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException);
private:
#ifndef NDEBUG
ThreadIdentifier m_thread;
#endif
};
class JSCallbackDataStrong : public JSCallbackData {
public:
JSCallbackDataStrong(JSC::JSObject* callback, void*)
: m_callback(callback->globalObject()->vm(), callback)
{
}
JSC::JSObject* callback() { return m_callback.get(); }
JSDOMGlobalObject* globalObject() { return JSC::jsCast<JSDOMGlobalObject*>(m_callback->globalObject()); }
JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
{
return JSCallbackData::invokeCallback(callback(), args, callbackType, functionName, returnedException);
}
private:
JSC::Strong<JSC::JSObject> m_callback;
};
class JSCallbackDataWeak : public JSCallbackData {
public:
JSCallbackDataWeak(JSC::JSObject* callback, void* owner)
: m_callback(callback, &m_weakOwner, owner)
{
}
JSC::JSObject* callback() { return m_callback.get(); }
JSDOMGlobalObject* globalObject() { return JSC::jsCast<JSDOMGlobalObject*>(m_callback->globalObject()); }
JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
{
return JSCallbackData::invokeCallback(callback(), args, callbackType, functionName, returnedException);
}
private:
class WeakOwner : public JSC::WeakHandleOwner {
virtual bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor&);
};
WeakOwner m_weakOwner;
JSC::Weak<JSC::JSObject> m_callback;
};
class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
public:
template <typename CallbackDataType>
explicit DeleteCallbackDataTask(CallbackDataType* data)
: ScriptExecutionContext::Task(ScriptExecutionContext::Task::CleanupTask, [data] (ScriptExecutionContext&) {
delete data;
})
{
}
};
} // namespace WebCore
#endif // JSCallbackData_h
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