1 // Copyright 2012 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef BASE_LOGGING_WIN_H_
6 #define BASE_LOGGING_WIN_H_
12 #include "base/base_export.h"
13 #include "base/logging.h"
14 #include "base/win/event_trace_provider.h"
17 template <typename Type>
18 struct StaticMemorySingletonTraits;
23 // Event ID for the log messages we generate.
24 EXTERN_C BASE_EXPORT const GUID kLogEventId;
26 // Feature enable mask for LogEventProvider.
28 // If this bit is set in our provider enable mask, we will include
29 // a stack trace with every log message.
30 ENABLE_STACK_TRACE_CAPTURE = 0x0001,
31 // If this bit is set in our provider enable mask, the provider will log
32 // a LOG message with only the textual content of the message, and no
34 ENABLE_LOG_MESSAGE_ONLY = 0x0002,
37 // The message types our log event provider generates.
38 // ETW likes user message types to start at 10.
39 enum LogMessageTypes {
40 // A textual only log message, contains a zero-terminated string.
42 // A message with a stack trace, followed by the zero-terminated
44 LOG_MESSAGE_WITH_STACKTRACE = 11,
47 // the line number as a four byte integer,
48 // the file as a zero terminated UTF8 string,
49 // the zero-terminated UTF8 message text.
50 LOG_MESSAGE_FULL = 12,
53 // Trace provider class to drive log control and transport
54 // with Event Tracing for Windows.
55 class BASE_EXPORT LogEventProvider : public base::win::EtwTraceProvider {
57 LogEventProvider(const LogEventProvider&) = delete;
58 LogEventProvider& operator=(const LogEventProvider&) = delete;
59 static LogEventProvider* GetInstance();
61 static bool LogMessage(logging::LogSeverity severity, const char* file,
62 int line, size_t message_start, const std::string& str);
64 static void Initialize(const GUID& provider_name);
65 static void Uninitialize();
68 // Overridden to manipulate the log level on ETW control callbacks.
69 void OnEventsEnabled() override;
70 void OnEventsDisabled() override;
75 // The log severity prior to OnEventsEnabled,
76 // restored in OnEventsDisabled.
77 logging::LogSeverity old_log_level_;
79 friend struct base::StaticMemorySingletonTraits<LogEventProvider>;
82 } // namespace logging
84 #endif // BASE_LOGGING_WIN_H_