1 files changed, 64 insertions, 0 deletions
diff --git a/ipc/mscom/AgileReference.cpp b/ipc/mscom/AgileReference.cpp
new file mode 100644
index 0000000000..76fe773b0a
--- /dev/null
+++ b/ipc/mscom/AgileReference.cpp
@@ -0,0 +1,64 @@
+/* -*- 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/. */
+
+#include "mozilla/mscom/AgileReference.h"
+
+#include <utility>
+#include "mozilla/Assertions.h"
+#include "mozilla/mscom/Utils.h"
+
+#if defined(__MINGW32__)
+
+// Declarations from Windows SDK specific to Windows 8.1
+
+enum AgileReferenceOptions {
+  AGILEREFERENCE_DEFAULT = 0,
+  AGILEREFERENCE_DELAYEDMARSHAL = 1,
+};
+
+HRESULT WINAPI RoGetAgileReference(AgileReferenceOptions options, REFIID riid,
+                                   IUnknown* pUnk,
+                                   IAgileReference** ppAgileReference);
+
+// Unfortunately, at time of writing, MinGW doesn't know how to statically link
+// to RoGetAgileReference. On these builds only, we substitute a runtime-linked
+// function pointer.
+
+#  include "mozilla/DynamicallyLinkedFunctionPtr.h"
+
+static const mozilla::StaticDynamicallyLinkedFunctionPtr<
+    decltype(&::RoGetAgileReference)>
+    pRoGetAgileReference(L"ole32.dll", "RoGetAgileReference");
+
+#  define RoGetAgileReference pRoGetAgileReference
+
+#endif  // defined(__MINGW32__)
+
+namespace mozilla::mscom::detail {
+
+HRESULT AgileReference_CreateImpl(RefPtr<IAgileReference>& aRefPtr, REFIID riid,
+                                  IUnknown* aObject) {
+  MOZ_ASSERT(aObject);
+  MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
+  return ::RoGetAgileReference(AGILEREFERENCE_DEFAULT, riid, aObject,
+                               getter_AddRefs(aRefPtr));
+}
+
+HRESULT AgileReference_ResolveImpl(RefPtr<IAgileReference> const& aRefPtr,
+                                   REFIID riid, void** aOutInterface) {
+  MOZ_ASSERT(aRefPtr);
+  MOZ_ASSERT(aOutInterface);
+  MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
+
+  if (!aRefPtr || !aOutInterface) {
+    return E_INVALIDARG;
+  }
+
+  *aOutInterface = nullptr;
+  return aRefPtr->Resolve(riid, aOutInterface);
+}
+
+}  // namespace mozilla::mscom::detail