Source/WebCore/bindings/js/JSUndoItemCustom.cpp

/*
 * Copyright (C) 2019-2021 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.
 *
 * 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
 * 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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 */

#include "config.h"
#include "JSUndoItem.h"
#include <JavaScriptCore/JSCJSValueInlines.h>

namespace WebCore {

template<typename Visitor>
void JSUndoItem::visitAdditionalChildren(Visitor& visitor)
{
    wrapped().undoHandler().visitJSFunction(visitor);
    wrapped().redoHandler().visitJSFunction(visitor);
}

DEFINE_VISIT_ADDITIONAL_CHILDREN(JSUndoItem);

bool JSUndoItemOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, JSC::AbstractSlotVisitor& visitor, const char** reason)
{
    if (UNLIKELY(reason))
        *reason = "Document is an opaque root.";

    auto* documentForUndoItem = JSC::jsCast<JSUndoItem*>(handle.slot()->asCell())->wrapped().document();
    return documentForUndoItem && visitor.containsOpaqueRoot(documentForUndoItem);
}

} // namespace WebCore