Source/WebCore/bindings/js/JSDOMWrapper.cpp

/*
 * Copyright (C) 2010-2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "JSDOMWrapper.h"

#include "DOMWindow.h"
#include "DOMWrapperWorld.h"
#include "JSDOMWindow.h"
#include "JSRemoteDOMWindow.h"
#include "SerializedScriptValue.h"
#include "WebCoreJSClientData.h"
#include <JavaScriptCore/Error.h>

namespace WebCore {

STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSDOMObject);

JSDOMObject::JSDOMObject(JSC::Structure* structure, JSC::JSGlobalObject& globalObject)
    : Base(globalObject.vm(), structure)
{
    ASSERT(scriptExecutionContext() || globalObject.classInfo(globalObject.vm()) == JSRemoteDOMWindow::info());
}

JSC::CompleteSubspace* outputConstraintSubspaceFor(JSC::VM& vm)
{
    return &static_cast<JSVMClientData*>(vm.clientData)->outputConstraintSpace();
}

JSC::JSValue cloneAcrossWorlds(JSC::JSGlobalObject& lexicalGlobalObject, const JSDOMObject& owner, JSC::JSValue value)
{
    if (isWorldCompatible(lexicalGlobalObject, value))
        return value;
    // FIXME: Is it best to handle errors by returning null rather than throwing an exception?
    auto serializedValue = SerializedScriptValue::create(lexicalGlobalObject, value, SerializationErrorMode::NonThrowing);
    if (!serializedValue)
        return JSC::jsNull();
    // FIXME: Why is owner->globalObject() better than lexicalGlobalObject.lexicalGlobalObject() here?
    // Unlike this, isWorldCompatible uses lexicalGlobalObject.lexicalGlobalObject(); should the two match?
    return serializedValue->deserialize(lexicalGlobalObject, owner.globalObject());
}

} // namespace WebCore