Source/WebCore/bindings/js/JSMessagePortCustom.cpp

/*
 * Copyright (C) 2008-2009, 2016 Apple Inc. All Rights Reserved.
 * Copyright (C) 2011 Google 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "JSMessagePort.h"

#include "Event.h"
#include "ExceptionCode.h"
#include "Frame.h"
#include "JSDOMBinding.h"
#include "JSDOMGlobalObject.h"
#include "JSEvent.h"
#include "JSEventListener.h"
#include "JSMessagePortCustom.h"
#include "MessagePort.h"
#include <heap/SlotVisitorInlines.h>
#include <runtime/Error.h>
#include <runtime/JSArrayBuffer.h>
#include <wtf/text/AtomicString.h>

using namespace JSC;

namespace WebCore {

void JSMessagePort::visitAdditionalChildren(SlotVisitor& visitor)
{
    // If we have a locally entangled port, we can directly mark it as reachable. Ports that are remotely entangled are marked in-use by markActiveObjectsForContext().
    if (MessagePort* port = wrapped().locallyEntangledPort())
        visitor.addOpaqueRoot(port);
}

JSC::JSValue JSMessagePort::postMessage(JSC::ExecState& state)
{
    return handlePostMessage(state, wrapped());
}

void extractTransferables(JSC::ExecState& state, JSC::JSValue value, Vector<RefPtr<MessagePort>>& portArray, Vector<RefPtr<JSC::ArrayBuffer>>& arrayBuffers)
{
    VM& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (value.isUndefinedOrNull()) {
        portArray.resize(0);
        arrayBuffers.resize(0);
        return;
    }

    // Validation of sequence types, per WebIDL spec 4.1.13.
    unsigned length = 0;
    JSObject* object = toJSSequence(state, value, length);
    RETURN_IF_EXCEPTION(scope, void());

    for (unsigned i = 0 ; i < length; ++i) {
        JSValue value = object->get(&state, i);
        RETURN_IF_EXCEPTION(scope, void());

        if (value.isUndefinedOrNull()) {
            setDOMException(&state, INVALID_STATE_ERR);
            return;
        }

        // Validation of Objects implementing an interface, per WebIDL spec 4.1.15.
        if (RefPtr<MessagePort> port = JSMessagePort::toWrapped(value)) {
            // Check for duplicate ports.
            if (portArray.contains(port)) {
                setDOMException(&state, INVALID_STATE_ERR);
                return;
            }
            portArray.append(WTFMove(port));
        } else {
            if (RefPtr<ArrayBuffer> arrayBuffer = toPossiblySharedArrayBuffer(value))
                arrayBuffers.append(WTFMove(arrayBuffer));
            else {
                throwTypeError(&state, scope);
                return;
            }
        }
    }
}

} // namespace WebCore