gecko-dev/ipc/mscom/ProfilerMarkers.cpp

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7.3 KiB
C++

/* -*- 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 "ProfilerMarkers.h"
#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/Atomics.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/mscom/Utils.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/Services.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsISupportsImpl.h"
#include "nsString.h"
#include "nsXULAppAPI.h"
#include <objbase.h>
#include <objidlbase.h>
// {9DBE6B28-E5E7-4FDE-AF00-9404604E74DC}
static const GUID GUID_MozProfilerMarkerExtension = {
0x9dbe6b28, 0xe5e7, 0x4fde, {0xaf, 0x0, 0x94, 0x4, 0x60, 0x4e, 0x74, 0xdc}};
namespace {
class ProfilerMarkerChannelHook final : public IChannelHook {
~ProfilerMarkerChannelHook() = default;
public:
ProfilerMarkerChannelHook() : mRefCnt(0) {}
// IUnknown
STDMETHODIMP QueryInterface(REFIID aIid, void** aOutInterface) override;
STDMETHODIMP_(ULONG) AddRef() override;
STDMETHODIMP_(ULONG) Release() override;
/**
* IChannelHook exposes six methods: The Client* methods are called when
* a client is sending an IPC request, whereas the Server* methods are called
* when a server is receiving an IPC request.
*
* For our purposes, we only care about the client-side methods. The COM
* runtime invokes the methods in the following order:
* 1. ClientGetSize, where the hook specifies the size of its payload;
* 2. ClientFillBuffer, where the hook fills the channel's buffer with its
* payload information. NOTE: This method is only called when ClientGetSize
* specifies a non-zero payload size. For our purposes, since we are not
* sending a payload, this method will never be called!
* 3. ClientNotify, when the response has been received from the server.
*
* Since we want to use these hooks to record the beginning and end of a COM
* IPC call, we use ClientGetSize for logging the start, and ClientNotify for
* logging the end.
*
* Finally, our implementation responds to any request matching our extension
* ID, however we only care about main thread COM calls.
*/
// IChannelHook
STDMETHODIMP_(void)
ClientGetSize(REFGUID aExtensionId, REFIID aIid,
ULONG* aOutDataSize) override;
// No-op (see the large comment above)
STDMETHODIMP_(void)
ClientFillBuffer(REFGUID aExtensionId, REFIID aIid, ULONG* aDataSize,
void* aDataBuf) override {}
STDMETHODIMP_(void)
ClientNotify(REFGUID aExtensionId, REFIID aIid, ULONG aDataSize,
void* aDataBuffer, DWORD aDataRep, HRESULT aFault) override;
// We don't care about the server-side notifications, so leave as no-ops.
STDMETHODIMP_(void)
ServerNotify(REFGUID aExtensionId, REFIID aIid, ULONG aDataSize,
void* aDataBuf, DWORD aDataRep) override {}
STDMETHODIMP_(void)
ServerGetSize(REFGUID aExtensionId, REFIID aIid, HRESULT aFault,
ULONG* aOutDataSize) override {}
STDMETHODIMP_(void)
ServerFillBuffer(REFGUID aExtensionId, REFIID aIid, ULONG* aDataSize,
void* aDataBuf, HRESULT aFault) override {}
private:
void BuildMarkerName(REFIID aIid, nsACString& aOutMarkerName);
private:
mozilla::Atomic<ULONG> mRefCnt;
};
HRESULT ProfilerMarkerChannelHook::QueryInterface(REFIID aIid,
void** aOutInterface) {
if (aIid == IID_IChannelHook || aIid == IID_IUnknown) {
RefPtr<IChannelHook> ptr(this);
ptr.forget(aOutInterface);
return S_OK;
}
return E_NOINTERFACE;
}
ULONG ProfilerMarkerChannelHook::AddRef() { return ++mRefCnt; }
ULONG ProfilerMarkerChannelHook::Release() {
ULONG result = --mRefCnt;
if (!result) {
delete this;
}
return result;
}
void ProfilerMarkerChannelHook::BuildMarkerName(REFIID aIid,
nsACString& aOutMarkerName) {
aOutMarkerName.AssignLiteral("ORPC Call for ");
nsAutoCString iidStr;
mozilla::mscom::DiagnosticNameForIID(aIid, iidStr);
aOutMarkerName.Append(iidStr);
}
void ProfilerMarkerChannelHook::ClientGetSize(REFGUID aExtensionId, REFIID aIid,
ULONG* aOutDataSize) {
if (aExtensionId == GUID_MozProfilerMarkerExtension) {
if (NS_IsMainThread()) {
nsAutoCString markerName;
BuildMarkerName(aIid, markerName);
PROFILER_MARKER(markerName, IPC, mozilla::MarkerTiming::IntervalStart(),
Tracing, "MSCOM");
}
if (aOutDataSize) {
// We don't add any payload data to the channel
*aOutDataSize = 0UL;
}
}
}
void ProfilerMarkerChannelHook::ClientNotify(REFGUID aExtensionId, REFIID aIid,
ULONG aDataSize, void* aDataBuffer,
DWORD aDataRep, HRESULT aFault) {
if (NS_IsMainThread() && aExtensionId == GUID_MozProfilerMarkerExtension) {
nsAutoCString markerName;
BuildMarkerName(aIid, markerName);
PROFILER_MARKER(markerName, IPC, mozilla::MarkerTiming::IntervalEnd(),
Tracing, "MSCOM");
}
}
} // anonymous namespace
static void RegisterChannelHook() {
RefPtr<ProfilerMarkerChannelHook> hook(new ProfilerMarkerChannelHook());
mozilla::DebugOnly<HRESULT> hr =
::CoRegisterChannelHook(GUID_MozProfilerMarkerExtension, hook);
MOZ_ASSERT(SUCCEEDED(hr));
}
namespace {
class ProfilerStartupObserver final : public nsIObserver {
~ProfilerStartupObserver() = default;
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
};
NS_IMPL_ISUPPORTS(ProfilerStartupObserver, nsIObserver)
NS_IMETHODIMP ProfilerStartupObserver::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData) {
if (strcmp(aTopic, "profiler-started")) {
return NS_OK;
}
RegisterChannelHook();
// Once we've set the channel hook, we don't care about this notification
// anymore; our channel hook will remain set for the lifetime of the process.
nsCOMPtr<nsIObserverService> obsServ(mozilla::services::GetObserverService());
MOZ_ASSERT(!!obsServ);
if (!obsServ) {
return NS_OK;
}
obsServ->RemoveObserver(this, "profiler-started");
return NS_OK;
}
} // anonymous namespace
namespace mozilla {
namespace mscom {
void InitProfilerMarkers() {
if (!XRE_IsParentProcess()) {
return;
}
MOZ_ASSERT(NS_IsMainThread());
if (!NS_IsMainThread()) {
return;
}
if (profiler_is_active()) {
// If the profiler is already running, we'll immediately register our
// channel hook.
RegisterChannelHook();
return;
}
// The profiler is not running yet. To avoid unnecessary invocations of the
// channel hook, we won't bother with installing it until the profiler starts.
// Set up an observer to watch for this.
nsCOMPtr<nsIObserverService> obsServ(mozilla::services::GetObserverService());
MOZ_ASSERT(!!obsServ);
if (!obsServ) {
return;
}
nsCOMPtr<nsIObserver> obs(new ProfilerStartupObserver());
obsServ->AddObserver(obs, "profiler-started", false);
}
} // namespace mscom
} // namespace mozilla