WIPjarred/workers

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diff --git a/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.h b/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.h
new file mode 100644
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+++ b/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2017-2021 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
+ * 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 "ActiveDOMCallback.h"
+#include "JSDOMGlobalObject.h"
+#include <JavaScriptCore/HeapInlines.h>
+#include <JavaScriptCore/JSCell.h>
+#include <JavaScriptCore/SlotVisitorInlines.h>
+#include <JavaScriptCore/StrongInlines.h>
+
+namespace WebCore {
+
+class WEBCORE_EXPORT DOMGuardedObject : public RefCounted<DOMGuardedObject>, public ActiveDOMCallback {
+public:
+    ~DOMGuardedObject();
+
+    bool isSuspended() const { return !m_guarded || !canInvokeCallback(); } // The wrapper world has gone away or active DOM objects have been suspended.
+
+    template<typename Visitor> void visitAggregate(Visitor& visitor) { visitor.append(m_guarded); }
+
+    JSC::JSValue guardedObject() const { return m_guarded.get(); }
+    JSDOMGlobalObject* globalObject() const { return m_globalObject.get(); }
+
+    void clear();
+
+protected:
+    DOMGuardedObject(JSDOMGlobalObject&, JSC::JSCell&);
+
+    void contextDestroyed() override;
+    bool isEmpty() const { return !m_guarded; }
+
+    JSC::Weak<JSC::JSCell> m_guarded;
+    JSC::Weak<JSDOMGlobalObject> m_globalObject;
+
+private:
+    void removeFromGlobalObject();
+};
+
+template <typename T> class DOMGuarded : public DOMGuardedObject {
+protected:
+    DOMGuarded(JSDOMGlobalObject& globalObject, T& guarded) : DOMGuardedObject(globalObject, guarded) { }
+    T* guarded() const { return JSC::jsDynamicCast<T*>(globalObject()->vm(), guardedObject()); }
+};
+
+} // namespace WebCore