MozReview-Commit-ID: A1lCqvbQYAF
There is no clean API-based solution to this, so instead I went grovelling
through the DCOM wire protocol and was able to write a function that converts
handler OBJREFs into standard OBJREFs.
See also:
https://msdn.microsoft.com/en-us/library/cc226801
--HG--
extra : rebase_source : a650055c4adda3a1d99262e47f2b463074c6b935
MozReview-Commit-ID: 2pyAiw53rj7
Currently we wrap every outpointer interface with its own interceptor. Even two
identical interface outparams will get their own unique interceptors. Not only
does this violate COM object identity, but it is also inefficient; if an
interceptor already exists for a given interface, we should reuse it.
This patch adds a live set: when we create a new interceptor, we first check
the live set and reuse an existing interceptor if it is present. Otherwise we
create a new one and then insert it into the set.
The set uses thread-safe weak references to guard against races during
interceptor teardown.
--HG--
extra : rebase_source : fb3f11600fb368d169bd1164433e2d8780592146
MozReview-Commit-ID: AmS5oBNV7Po
When creating a new interceptor, we already have the correct target interface.
The interceptor ignores this and does a redundant inter-thread QI to resolve
an interface that we already have!
This patch adds a fast path to interceptor initialization that skips all of that
stuff and directly initializes itself using the given target interceptor.
--HG--
extra : rebase_source : dcfff7270efd5bda990e240bb06a9206656d5852
This patch does the following renamings, which increase consistency.
- GeckoProfilerInitRAII -> AutoProfilerInit
- GeckoProfilerThread{Sleep,Wake}RAII -> AutoProfilerThread{Sleep,Wake}
- GeckoProfilerTracingRAII -> AutoProfilerTracing
- AutoProfilerRegister -> AutoProfilerRegisterThread
- ProfilerStackFrameRAII -> AutoProfilerLabel
- nsJSUtils::mProfilerRAII -> nsJSUtils::mAutoProfilerLabel
Plus a few other minor ones (e.g. local variables).
The patch also add MOZ_GUARD_OBJECT macros to all the profiler RAII classes
that lack them, and does some minor whitespace reformatting.
--HG--
extra : rebase_source : 47e298fdd6f6b4af70e3357ec0b7b0580c0d0f50
TimeStamp::ProcessCreations()'s aIsInconsistent outparam is ignored by the
majority of its caller. This patch makes it optional. Notably, this makes
ProcessCreation() easier to use in a constructor's initializer list.
MozReview-Commit-ID: GTQF3x1pBtX
A general outline of the COM handler (a.k.a. the "smart proxy"):
COM handlers are pieces of code that are loaded by the COM runtime along with
a proxy and are layered above that proxy. This enables the COM handler to
interpose itself between the caller and the proxy, thus providing the
opportunity for the handler to manipulate an interface's method calls before
those calls reach the proxy.
Handlers are regular COM components that live in DLLs and are declared in the
Windows registry. In order to allow for the specifying of a handler (and an
optional payload to be sent with the proxy), the mscom library allows its
clients to specify an implementation of the IHandlerProvider interface.
IHandlerProvider consists of 5 functions:
* GetHandler returns the CLSID of the component that should be loaded into
the COM client's process. If GetHandler returns a failure code, then no
handler is loaded.
* GetHandlerPayloadSize and WriteHandlerPayload are for obtaining the payload
data. These calls are made on a background thread but need to do their work
on the main thread. We declare the payload struct in IDL. MIDL generates two
functions, IA2Payload_Encode and IA2Payload_Decode, which are used by
mscom::StructToStream to read and write that struct to and from buffers.
* The a11y payload struct also includes an interface, IGeckoBackChannel, that
allows the handler to communicate directly with Gecko. IGeckoBackChannel
currently provides two methods: one to allow the handler to request fresh
cache information, and the other to provide Gecko with its IHandlerControl
interface.
* MarshalAs accepts an IID that specifies the interface that is about to be
proxied. We may want to send a more sophisticated proxy than the one that
is requested. The desired IID is returned by this function. In the case of
a11y interfaces, we should always return IAccessible2_3 if we are asked for
one of its parent interfaces. This allows us to eliminate round trips to
resolve more sophisticated interfaces later on.
* NewInstance, which is needed to ensure that all descendent proxies are also
imbued with the same handler code.
The main focus of this patch is as follows:
1. Provide an implementation of the IHandlerProvider interface;
2. Populate the handler payload (ie, the cache) with data;
3. Modify CreateHolderFromAccessible to specify the HandlerPayload object;
4. Receive the IHandlerControl interface from the handler DLL and move it
into the chrome process.
Some more information about IHandlerControl:
There is one IHandlerControl per handler DLL instance. It is the interface that
we call in Gecko when we need to dispatch an event to the handler. In order to
ensure that events are dispatched in the correct order, we need to dispatch
those events from the chrome main thread so that they occur in sequential order
with calls to NotifyWinEvent.
--HG--
extra : rebase_source : acb44dead7cc5488424720e1bf58862b7b30374f
Initializing nsSystemInfo can't be done off the main thread on
Windows, and we can't guarantee that it has been initialized before
calling this code.
MozReview-Commit-ID: DRNCrakNMmH
--HG--
extra : rebase_source : b711f37b169f3c93a39fc2af56a9c76c656a9c38
