gecko-dev/xpcom/build/perfprobe.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
2012-05-21 11:12:37 +00:00
/* 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/. */
/*****************************
Windows implementation of probes, using xperf
*****************************/
#include <windows.h>
#include <wmistr.h>
#include <evntrace.h>
#include "perfprobe.h"
#include "nsAutoPtr.h"
namespace mozilla {
namespace probes {
#if defined(MOZ_LOGGING)
static PRLogModuleInfo *
GetProbeLog()
{
static PRLogModuleInfo *sLog;
if (!sLog)
sLog = PR_NewLogModule("SysProbe");
return sLog;
}
#define LOG(x) PR_LOG(GetProbeLog(), PR_LOG_DEBUG, x)
#else
#define LOG(x)
#endif
//Utility function
GUID CID_to_GUID(const nsCID &aCID)
{
GUID result;
result.Data1 = aCID.m0;
result.Data2 = aCID.m1;
result.Data3 = aCID.m2;
for (int i = 0; i < 8; ++i)
result.Data4[i] = aCID.m3[i];
return result;
}
// Implementation of Probe
Probe::Probe(const nsCID &aGUID,
const nsACString &aName,
ProbeManager *aManager)
: mGUID(CID_to_GUID(aGUID))
, mName(aName)
, mManager(aManager)
{
}
nsresult Probe::Trigger()
{
if (!(mManager->mIsActive)) {
//Do not trigger if there is no session
return NS_OK;
}
_EVENT_TRACE_HEADER event;
ZeroMemory(&event, sizeof(event));
event.Size = sizeof(event);
event.Flags = WNODE_FLAG_TRACED_GUID ;
event.Guid = (const GUID)mGUID;
event.Class.Type = 1;
event.Class.Version = 0;
event.Class.Level = TRACE_LEVEL_INFORMATION;
ULONG result = TraceEvent(mManager->mSessionHandle, &event);
LOG(("Probes: Triggered %s, %s, %ld",
mName.Data(),
result==ERROR_SUCCESS ? "success":"failure",
result));
nsresult rv;
switch(result)
{
case ERROR_SUCCESS: rv = NS_OK; break;
case ERROR_INVALID_FLAG_NUMBER:
case ERROR_MORE_DATA:
case ERROR_INVALID_PARAMETER: rv = NS_ERROR_INVALID_ARG; break;
case ERROR_INVALID_HANDLE: rv = NS_ERROR_FAILURE; break;
case ERROR_NOT_ENOUGH_MEMORY:
case ERROR_OUTOFMEMORY: rv = NS_ERROR_OUT_OF_MEMORY; break;
default: rv = NS_ERROR_UNEXPECTED;
}
return rv;
}
// Implementation of ProbeManager
ProbeManager::~ProbeManager()
{
//If the manager goes out of scope, stop the session.
if (mIsActive && mRegistrationHandle) {
StopSession();
}
}
ProbeManager::ProbeManager(const nsCID &aApplicationUID,
const nsACString &aApplicationName)
: mApplicationUID(aApplicationUID)
, mApplicationName(aApplicationName)
, mSessionHandle(0)
, mRegistrationHandle(0)
{
#if defined(MOZ_LOGGING)
char cidStr[NSID_LENGTH];
aApplicationUID.ToProvidedString(cidStr);
LOG(("ProbeManager::Init for application %s, %s",
aApplicationName.Data(), cidStr));
#endif
}
//Note: The Windows API is just a little bit scary there.
//The only way to obtain the session handle is to
//- ignore the session handle obtained from RegisterTraceGuids
//- pass a callback
//- in that callback, request the session handle through
// GetTraceLoggerHandle and some opaque value received by the callback
ULONG WINAPI ControlCallback(
WMIDPREQUESTCODE RequestCode,
PVOID Context,
ULONG *Reserved,
PVOID Buffer
)
{
ProbeManager* context = (ProbeManager*)Context;
switch(RequestCode)
{
case WMI_ENABLE_EVENTS:
{
context->mIsActive = true;
TRACEHANDLE sessionHandle = GetTraceLoggerHandle(Buffer);
//Note: We only accept one handle
if ((HANDLE)sessionHandle == INVALID_HANDLE_VALUE) {
ULONG result = GetLastError();
LOG(("Probes: ControlCallback failed, %ul", result));
return result;
} else if (context->mIsActive && context->mSessionHandle
&& context->mSessionHandle != sessionHandle) {
LOG(("Probes: Can only handle one context at a time, "
"ignoring activation"));
return ERROR_SUCCESS;
} else {
context->mSessionHandle = sessionHandle;
LOG(("Probes: ControlCallback activated"));
return ERROR_SUCCESS;
}
}
case WMI_DISABLE_EVENTS:
context->mIsActive = false;
context->mSessionHandle = 0;
LOG(("Probes: ControlCallback deactivated"));
return ERROR_SUCCESS;
default:
LOG(("Probes: ControlCallback does not know what to do with %d",
RequestCode));
return ERROR_INVALID_PARAMETER;
}
}
already_AddRefed<Probe> ProbeManager::GetProbe(const nsCID &eventUID,
const nsACString &eventName)
{
nsRefPtr<Probe> result(new Probe(eventUID, eventName, this));
mAllProbes.AppendElement(result);
return result.forget();
}
nsresult ProbeManager::StartSession()
{
return StartSession(mAllProbes);
}
nsresult ProbeManager::StartSession(nsTArray<nsRefPtr<Probe>> &aProbes)
{
const size_t probesCount = aProbes.Length();
_TRACE_GUID_REGISTRATION* probes = new _TRACE_GUID_REGISTRATION[probesCount];
for (unsigned int i = 0; i < probesCount; ++i) {
const Probe *probe = aProbes[i];
const Probe *probeX = static_cast<const Probe*>(probe);
probes[i].Guid = (LPCGUID)&(probeX->mGUID);
}
ULONG result =
RegisterTraceGuids(&ControlCallback
/*RequestAddress: Sets mSessions appropriately.*/,
this
/*RequestContext: Passed to ControlCallback*/,
(LPGUID)&mApplicationUID
/*ControlGuid: Tracing GUID
the cast comes from MSDN examples*/,
probesCount
/*GuidCount: Number of probes*/,
probes
/*TraceGuidReg: Probes registration*/,
nullptr
/*MofImagePath: Must be nullptr, says MSDN*/,
nullptr
/*MofResourceName:Must be nullptr, says MSDN*/,
&mRegistrationHandle
/*RegistrationHandle: Handler.
used only for unregistration*/
);
delete[] probes;
if (NS_WARN_IF(result != ERROR_SUCCESS))
return NS_ERROR_UNEXPECTED;
return NS_OK;
}
nsresult ProbeManager::StopSession()
{
LOG(("Probes: Stopping measures"));
if (mSessionHandle != 0) {
ULONG result = UnregisterTraceGuids(mSessionHandle);
mSessionHandle = 0;
if (result != ERROR_SUCCESS) {
return NS_ERROR_INVALID_ARG;
}
}
return NS_OK;
}
}
}