Move Windows-specific Event Tracing for Windows implementation to base/win. ...

base/event_trace_provider_win.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-#include "base/event_trace_provider_win.h"
-#include <windows.h>
-#include <cguid.h>
-
-TRACE_GUID_REGISTRATION EtwTraceProvider::obligatory_guid_registration_ = {
-  &GUID_NULL,
-  NULL
-};
-
-EtwTraceProvider::EtwTraceProvider(const GUID& provider_name)
-    : provider_name_(provider_name), registration_handle_(NULL),
-      session_handle_(NULL), enable_flags_(0), enable_level_(0) {
-}
-
-EtwTraceProvider::EtwTraceProvider()
-    : provider_name_(GUID_NULL), registration_handle_(NULL),
-      session_handle_(NULL), enable_flags_(0), enable_level_(0) {
-}
-
-EtwTraceProvider::~EtwTraceProvider() {
-  Unregister();
-}
-
-ULONG EtwTraceProvider::EnableEvents(void* buffer) {
-  session_handle_ = ::GetTraceLoggerHandle(buffer);
-  if (NULL == session_handle_) {
-    return ::GetLastError();
-  }
-
-  enable_flags_ = ::GetTraceEnableFlags(session_handle_);
-  enable_level_ = ::GetTraceEnableLevel(session_handle_);
-
-  // Give subclasses a chance to digest the state change.
-  OnEventsEnabled();
-
-  return ERROR_SUCCESS;
-}
-
-ULONG EtwTraceProvider::DisableEvents() {
-  // Give subclasses a chance to digest the state change.
-  OnEventsDisabled();
-
-  enable_level_ = 0;
-  enable_flags_ = 0;
-  session_handle_ = NULL;
-
-  PostEventsDisabled();
-
-  return ERROR_SUCCESS;
-}
-
-ULONG EtwTraceProvider::Callback(WMIDPREQUESTCODE request, void* buffer) {
-  switch (request) {
-    case WMI_ENABLE_EVENTS:
-      return EnableEvents(buffer);
-    case WMI_DISABLE_EVENTS:
-      return DisableEvents();
-    default:
-      return ERROR_INVALID_PARAMETER;
-  }
-  // Not reached.
-}
-
-ULONG WINAPI EtwTraceProvider::ControlCallback(WMIDPREQUESTCODE request,
-    void* context, ULONG *reserved, void* buffer) {
-  EtwTraceProvider *provider = reinterpret_cast<EtwTraceProvider*>(context);
-
-  return provider->Callback(request, buffer);
-}
-
-ULONG EtwTraceProvider::Register() {
-  if (provider_name_ == GUID_NULL)
-    return ERROR_INVALID_NAME;
-
-  return ::RegisterTraceGuids(ControlCallback, this, &provider_name_,
-      1, &obligatory_guid_registration_, NULL, NULL, &registration_handle_);
-}
-
-ULONG EtwTraceProvider::Unregister() {
-  ULONG ret = ::UnregisterTraceGuids(registration_handle_);
-
-  // Make sure we don't log anything from here on.
-  enable_level_ = 0;
-  enable_flags_ = 0;
-  session_handle_ = NULL;
-  registration_handle_ = NULL;
-
-  return ret;
-}
-
-ULONG EtwTraceProvider::Log(const EtwEventClass& event_class,
-    EtwEventType type, EtwEventLevel level, const char *message) {
-  if (NULL == session_handle_ || enable_level_ < level)
-    return ERROR_SUCCESS;  // No one listening.
-
-  EtwMofEvent<1> event(event_class, type, level);
-
-  event.fields[0].DataPtr = reinterpret_cast<ULONG64>(message);
-  event.fields[0].Length = message ?
-      static_cast<ULONG>(sizeof(message[0]) * (1 + strlen(message))) : 0;
-
-  return ::TraceEvent(session_handle_, &event.header);
-}
-
-ULONG EtwTraceProvider::Log(const EtwEventClass& event_class,
-    EtwEventType type, EtwEventLevel level, const wchar_t *message) {
-  if (NULL == session_handle_ || enable_level_ < level)
-    return ERROR_SUCCESS;  // No one listening.
-
-  EtwMofEvent<1> event(event_class, type, level);
-
-  event.fields[0].DataPtr = reinterpret_cast<ULONG64>(message);
-  event.fields[0].Length = message ?
-      static_cast<ULONG>(sizeof(message[0]) * (1 + wcslen(message))) : 0;
-
-  return ::TraceEvent(session_handle_, &event.header);
-}
-
-ULONG EtwTraceProvider::Log(EVENT_TRACE_HEADER* event) {
-  if (enable_level_ < event->Class.Level)
-    return ERROR_SUCCESS;
-
-  return ::TraceEvent(session_handle_, event);
-}