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132a49a8a1
When marshaling a11y calls from the content process, there are quite a lot of cross-thread QueryInterface calls (ipc::mscom::Interceptor::QueryInterfaceTarget). Some of these are for special COM interfaces like IAgileObject and IFastRundown, which we could just special case in Interceptor::QueryInterface like we do for INoMarshal. However, it seems there are a lot of other interfaces being queried and it's not clear why. This patch adds a new HandlerProvider method: IsInterfaceMaybeSupported. This allows implementations to indicate when there are interfaces which they definitely don't support, allowing the call to be answered without a cross-thread call. Differential Revision: https://phabricator.services.mozilla.com/D69285 --HG-- extra : moz-landing-system : lando
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_mscom_IHandlerProvider_h
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#define mozilla_mscom_IHandlerProvider_h
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#include "mozilla/NotNull.h"
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#include "mozilla/mscom/Ptr.h"
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#include <objidl.h>
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namespace mozilla {
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namespace mscom {
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struct IInterceptor;
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struct HandlerProvider {
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virtual STDMETHODIMP GetHandler(NotNull<CLSID*> aHandlerClsid) = 0;
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virtual STDMETHODIMP GetHandlerPayloadSize(
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NotNull<IInterceptor*> aInterceptor, NotNull<DWORD*> aOutPayloadSize) = 0;
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virtual STDMETHODIMP WriteHandlerPayload(NotNull<IInterceptor*> aInterceptor,
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NotNull<IStream*> aStream) = 0;
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virtual STDMETHODIMP_(REFIID) MarshalAs(REFIID aIid) = 0;
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virtual STDMETHODIMP DisconnectHandlerRemotes() = 0;
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/**
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* Determine whether this interface might be supported by objects using
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* this HandlerProvider.
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* This is used to avoid unnecessary cross-thread QueryInterface calls for
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* interfaces known to be unsupported.
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* Return S_OK if the interface might be supported, E_NOINTERFACE if it
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* definitely isn't supported.
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*/
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virtual STDMETHODIMP IsInterfaceMaybeSupported(REFIID aIid) { return S_OK; }
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};
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struct IHandlerProvider : public IUnknown, public HandlerProvider {
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virtual STDMETHODIMP_(REFIID)
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GetEffectiveOutParamIid(REFIID aCallIid, ULONG aCallMethod) = 0;
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virtual STDMETHODIMP NewInstance(
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REFIID aIid, InterceptorTargetPtr<IUnknown> aTarget,
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NotNull<IHandlerProvider**> aOutNewPayload) = 0;
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};
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} // namespace mscom
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} // namespace mozilla
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#endif // mozilla_mscom_IHandlerProvider_h
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