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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/. */
#include "mozilla/mscom/AgileReference.h"
#include <utility>
#include "mozilla/Assertions.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/DynamicallyLinkedFunctionPtr.h"
#include "mozilla/mscom/Utils.h"
#if defined(MOZILLA_INTERNAL_API)
# include "nsDebug.h"
# include "nsPrintfCString.h"
#endif // defined(MOZILLA_INTERNAL_API)
#if NTDDI_VERSION < NTDDI_WINBLUE
// 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);
#endif // NTDDI_VERSION < NTDDI_WINBLUE
namespace mozilla {
namespace mscom {
namespace detail {
GlobalInterfaceTableCookie::GlobalInterfaceTableCookie(IUnknown* aObject,
REFIID aIid,
HRESULT& aOutHResult)
: mCookie(0) {
IGlobalInterfaceTable* git = ObtainGit();
MOZ_ASSERT(git);
if (!git) {
aOutHResult = E_POINTER;
return;
}
aOutHResult = git->RegisterInterfaceInGlobal(aObject, aIid, &mCookie);
MOZ_ASSERT(SUCCEEDED(aOutHResult));
}
GlobalInterfaceTableCookie::~GlobalInterfaceTableCookie() {
IGlobalInterfaceTable* git = ObtainGit();
MOZ_ASSERT(git);
if (!git) {
return;
}
DebugOnly<HRESULT> hr = git->RevokeInterfaceFromGlobal(mCookie);
#if defined(MOZILLA_INTERNAL_API)
NS_WARNING_ASSERTION(
SUCCEEDED(hr),
nsPrintfCString("IGlobalInterfaceTable::RevokeInterfaceFromGlobal failed "
"with HRESULT 0x%08lX",
((HRESULT)hr))
.get());
#else
MOZ_ASSERT(SUCCEEDED(hr));
#endif // defined(MOZILLA_INTERNAL_API)
mCookie = 0;
}
HRESULT GlobalInterfaceTableCookie::GetInterface(REFIID aIid,
void** aOutInterface) const {
IGlobalInterfaceTable* git = ObtainGit();
MOZ_ASSERT(git);
if (!git) {
return E_UNEXPECTED;
}
MOZ_ASSERT(IsValid());
return git->GetInterfaceFromGlobal(mCookie, aIid, aOutInterface);
}
/* static */
IGlobalInterfaceTable* GlobalInterfaceTableCookie::ObtainGit() {
// Internally to COM, the Global Interface Table is a singleton, therefore we
// don't worry about holding onto this reference indefinitely.
static IGlobalInterfaceTable* sGit = []() -> IGlobalInterfaceTable* {
IGlobalInterfaceTable* result = nullptr;
DebugOnly<HRESULT> hr = ::CoCreateInstance(
CLSID_StdGlobalInterfaceTable, nullptr, CLSCTX_INPROC_SERVER,
IID_IGlobalInterfaceTable, reinterpret_cast<void**>(&result));
MOZ_ASSERT(SUCCEEDED(hr));
return result;
}();
return sGit;
}
} // namespace detail
AgileReference::AgileReference() : mIid(), mHResult(E_NOINTERFACE) {}
AgileReference::AgileReference(REFIID aIid, IUnknown* aObject)
: mIid(aIid), mHResult(E_UNEXPECTED) {
AssignInternal(aObject);
}
AgileReference::AgileReference(AgileReference&& aOther)
: mIid(aOther.mIid),
mAgileRef(std::move(aOther.mAgileRef)),
mGitCookie(std::move(aOther.mGitCookie)),
mHResult(aOther.mHResult) {
aOther.mHResult = CO_E_RELEASED;
}
void AgileReference::Assign(REFIID aIid, IUnknown* aObject) {
Clear();
mIid = aIid;
AssignInternal(aObject);
}
void AgileReference::AssignInternal(IUnknown* aObject) {
// We expect mIid to already be set
DebugOnly<IID> zeroIid = {};
MOZ_ASSERT(mIid != zeroIid);
/*
* There are two possible techniques for creating agile references. Starting
* with Windows 8.1, we may use the RoGetAgileReference API, which is faster.
* If that API is not available, we fall back to using the Global Interface
* Table.
*/
static const StaticDynamicallyLinkedFunctionPtr<decltype(
&::RoGetAgileReference)>
pRoGetAgileReference(L"ole32.dll", "RoGetAgileReference");
MOZ_ASSERT(aObject);
if (pRoGetAgileReference &&
SUCCEEDED(mHResult =
pRoGetAgileReference(AGILEREFERENCE_DEFAULT, mIid, aObject,
getter_AddRefs(mAgileRef)))) {
return;
}
mGitCookie = new detail::GlobalInterfaceTableCookie(aObject, mIid, mHResult);
MOZ_ASSERT(mGitCookie->IsValid());
}
AgileReference::~AgileReference() { Clear(); }
void AgileReference::Clear() {
mIid = {};
mAgileRef = nullptr;
mGitCookie = nullptr;
mHResult = E_NOINTERFACE;
}
AgileReference& AgileReference::operator=(const AgileReference& aOther) {
Clear();
mIid = aOther.mIid;
mAgileRef = aOther.mAgileRef;
mGitCookie = aOther.mGitCookie;
mHResult = aOther.mHResult;
return *this;
}
AgileReference& AgileReference::operator=(AgileReference&& aOther) {
Clear();
mIid = aOther.mIid;
mAgileRef = std::move(aOther.mAgileRef);
mGitCookie = std::move(aOther.mGitCookie);
mHResult = aOther.mHResult;
aOther.mHResult = CO_E_RELEASED;
return *this;
}
HRESULT
AgileReference::Resolve(REFIID aIid, void** aOutInterface) const {
MOZ_ASSERT(aOutInterface);
// This check is exclusive-OR; we should have one or the other, but not both
MOZ_ASSERT((mAgileRef || mGitCookie) && !(mAgileRef && mGitCookie));
MOZ_ASSERT(IsCOMInitializedOnCurrentThread());
if (!aOutInterface) {
return E_INVALIDARG;
}
*aOutInterface = nullptr;
if (mAgileRef) {
// IAgileReference lets you directly resolve the interface you want...
return mAgileRef->Resolve(aIid, aOutInterface);
}
if (!mGitCookie) {
return E_UNEXPECTED;
}
RefPtr<IUnknown> originalInterface;
HRESULT hr =
mGitCookie->GetInterface(mIid, getter_AddRefs(originalInterface));
if (FAILED(hr)) {
return hr;
}
if (aIid == mIid) {
originalInterface.forget(aOutInterface);
return S_OK;
}
// ...Whereas the GIT requires us to obtain the same interface that we
// requested and then QI for the desired interface afterward.
return originalInterface->QueryInterface(aIid, aOutInterface);
}
} // namespace mscom
} // namespace mozilla
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