ipc/mscom/AgileReference.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/mscom/AgileReference.h"
   8
   9 #include <utility>
  10 #include "mozilla/Assertions.h"
  11 #include "mozilla/mscom/Utils.h"
  12
  13 #if defined(__MINGW32__)
  14
  15 // Declarations from Windows SDK specific to Windows 8.1
  16
  17 enum AgileReferenceOptions {
  18   AGILEREFERENCE_DEFAULT = 0,
  19   AGILEREFERENCE_DELAYEDMARSHAL = 1,
  20 };
  21
  22 HRESULT WINAPI RoGetAgileReference(AgileReferenceOptions options, REFIID riid,
  23                                    IUnknown* pUnk,
  24                                    IAgileReference** ppAgileReference);
  25
  26 // Unfortunately, at time of writing, MinGW doesn't know how to statically link
  27 // to RoGetAgileReference. On these builds only, we substitute a runtime-linked
  28 // function pointer.
  29
  30 #  include "mozilla/DynamicallyLinkedFunctionPtr.h"
  31
  32 static const mozilla::StaticDynamicallyLinkedFunctionPtr<
  33     decltype(&::RoGetAgileReference)>
  34     pRoGetAgileReference(L"ole32.dll", "RoGetAgileReference");
  35
  36 #  define RoGetAgileReference pRoGetAgileReference
  37
  38 #endif  // defined(__MINGW32__)
  39
  40 namespace mozilla::mscom::detail {
  41
  42 HRESULT AgileReference_CreateImpl(RefPtr<IAgileReference>& aRefPtr, REFIID riid,
  43                                   IUnknown* aObject) {
  44   MOZ_ASSERT(aObject);
  45   MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
  46   return ::RoGetAgileReference(AGILEREFERENCE_DEFAULT, riid, aObject,
  47                                getter_AddRefs(aRefPtr));
  48 }
  49
  50 HRESULT AgileReference_ResolveImpl(RefPtr<IAgileReference> const& aRefPtr,
  51                                    REFIID riid, void** aOutInterface) {
  52   MOZ_ASSERT(aRefPtr);
  53   MOZ_ASSERT(aOutInterface);
  54   MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
  55
  56   if (!aRefPtr || !aOutInterface) {
  57     return E_INVALIDARG;
  58   }
  59
  60   *aOutInterface = nullptr;
  61   return aRefPtr->Resolve(riid, aOutInterface);
  62 }
  63
  64 }  // namespace mozilla::mscom::detail