1 files changed, 71 insertions, 0 deletions
diff --git a/dom/serviceworkers/ServiceWorkerCloneData.h b/dom/serviceworkers/ServiceWorkerCloneData.h
new file mode 100644
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+++ b/dom/serviceworkers/ServiceWorkerCloneData.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ServiceWorkerCloneData_h__
+#define mozilla_dom_ServiceWorkerCloneData_h__
+
+#include "mozilla/Assertions.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "nsCOMPtr.h"
+#include "nsISupports.h"
+
+class nsISerialEventTarget;
+
+namespace mozilla {
+namespace ipc {
+class PBackgroundChild;
+class PBackgroundParent;
+}  // namespace ipc
+
+namespace dom {
+
+class ClonedOrErrorMessageData;
+
+// Helper class used to pack structured clone data so that it can be
+// passed across thread and process boundaries.  Currently the raw
+// StructuredCloneData and StructureCloneHolder APIs both make it
+// difficult to meet this needs directly.  This helper class improves
+// the situation by:
+//
+//  1. Provides a ref-counted version of StructuredCloneData.  We need
+//     StructuredCloneData so we can serialize/deserialize across IPC.
+//     The move constructor problems in StructuredCloneData (bug 1462676),
+//     though, makes it hard to pass it around.  Passing a ref-counted
+//     pointer addresses this problem.
+//  2. Normally StructuredCloneData runs into problems if you try to move
+//     it across thread boundaries because it releases its SharedJSAllocatedData
+//     on the wrong thread.  This helper will correctly proxy release the
+//     shared data on the correct thread.
+//
+// This helper class should really just be used to serialize on one thread
+// and then move the reference across thread/process boundries to the
+// target worker thread.  This class is not intended to support simultaneous
+// read/write operations from different threads at the same time.
+class ServiceWorkerCloneData final : public ipc::StructuredCloneData {
+  nsCOMPtr<nsISerialEventTarget> mEventTarget;
+  bool mIsErrorMessageData;
+
+  ~ServiceWorkerCloneData();
+
+ public:
+  ServiceWorkerCloneData();
+
+  bool BuildClonedMessageData(ClonedOrErrorMessageData& aClonedData);
+
+  void CopyFromClonedMessageData(const ClonedOrErrorMessageData& aClonedData);
+
+  void SetAsErrorMessageData();
+
+  bool IsErrorMessageData() const;
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ServiceWorkerCloneData)
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_ServiceWorkerCloneData_h__