1 files changed, 71 insertions, 0 deletions
diff --git a/ipc/mscom/MainThreadHandoff.h b/ipc/mscom/MainThreadHandoff.h
new file mode 100644
index 000000000..a3ae47e1b
--- /dev/null
+++ b/ipc/mscom/MainThreadHandoff.h
@@ -0,0 +1,71 @@
+/* -*- 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_mscom_MainThreadHandoff_h
+#define mozilla_mscom_MainThreadHandoff_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Move.h"
+#include "mozilla/mscom/Interceptor.h"
+#include "mozilla/mscom/MainThreadInvoker.h"
+#include "mozilla/mscom/Utils.h"
+#include "mozilla/Mutex.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace mscom {
+
+struct ArrayData;
+
+class MainThreadHandoff final : public IInterceptorSink
+                              , public ICallFrameWalker
+{
+public:
+  static HRESULT Create(IInterceptorSink** aOutput);
+
+  template <typename Interface>
+  static HRESULT WrapInterface(STAUniquePtr<Interface> aTargetInterface,
+                               Interface** aOutInterface)
+  {
+    MOZ_ASSERT(!IsProxy(aTargetInterface.get()));
+    RefPtr<IInterceptorSink> handoff;
+    HRESULT hr = MainThreadHandoff::Create(getter_AddRefs(handoff));
+    if (FAILED(hr)) {
+      return hr;
+    }
+    return CreateInterceptor(Move(aTargetInterface), handoff, aOutInterface);
+  }
+
+  // IUnknown
+  STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
+  STDMETHODIMP_(ULONG) AddRef() override;
+  STDMETHODIMP_(ULONG) Release() override;
+
+  // ICallFrameEvents
+  STDMETHODIMP OnCall(ICallFrame* aFrame) override;
+
+  // IInterceptorSink
+  STDMETHODIMP SetInterceptor(IWeakReference* aInterceptor) override;
+
+  // ICallFrameWalker
+  STDMETHODIMP OnWalkInterface(REFIID aIid, PVOID* aInterface, BOOL aIsInParam,
+                               BOOL aIsOutParam) override;
+
+private:
+  MainThreadHandoff();
+  ~MainThreadHandoff();
+  HRESULT FixArrayElements(ICallFrame* aFrame,
+                           const ArrayData& aArrayData);
+
+private:
+  ULONG                   mRefCnt;
+  RefPtr<IWeakReference>  mInterceptor;
+};
+
+} // namespace mscom
+} // namespace mozilla
+
+#endif // mozilla_mscom_MainThreadHandoff_h