1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_LOGGING_WIN_H_ 6 #define BASE_LOGGING_WIN_H_ 7 8 #include <string> 9 #include "base/basictypes.h" 10 #include "base/event_trace_provider_win.h" 11 #include "base/logging.h" 12 13 namespace logging { 14 15 // Event ID for the log messages we generate. 16 extern const GUID kLogEventId; 17 18 // Feature enable mask for LogEventProvider. 19 enum LogEnableMask { 20 // If this bit is set in our provider enable mask, we will include 21 // a stack trace with every log message. 22 ENABLE_STACK_TRACE_CAPTURE = 0x0001, 23 }; 24 25 // The message types our log event provider generates. 26 // ETW likes user message types to start at 10. 27 enum LogMessageTypes { 28 // A textual only log message, contains a zero-terminated string. 29 LOG_MESSAGE = 10, 30 // A message with a stack trace, followed by the zero-terminated 31 // message text. 32 LOG_MESSAGE_WITH_STACKTRACE = 11, 33 }; 34 35 // Trace provider class to drive log control and transport 36 // with Event Tracing for Windows. 37 class LogEventProvider : public EtwTraceProvider { 38 public: 39 LogEventProvider(); 40 41 static bool LogMessage(int severity, const std::string& message); 42 static void Initialize(const GUID& provider_name); 43 static void Uninitialize(); 44 45 protected: 46 // Overridden to manipulate the log level on ETW control callbacks. 47 virtual void OnEventsEnabled(); 48 virtual void OnEventsDisabled(); 49 50 private: 51 // The log severity prior to OnEventsEnabled, 52 // restored in OnEventsDisabled. 53 logging::LogSeverity old_log_level_; 54 55 DISALLOW_COPY_AND_ASSIGN(LogEventProvider); 56 }; 57 58 } // namespace logging 59 60 #endif // BASE_LOGGING_WIN_H_ 61
