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// Copyright (c) 2011 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.
#ifndef BASE_LOGGING_WIN_H_
#define BASE_LOGGING_WIN_H_
#pragma once
#include <string>
#include "base/base_api.h"
#include "base/basictypes.h"
#include "base/win/event_trace_provider.h"
#include "base/logging.h"
template <typename Type>
struct StaticMemorySingletonTraits;
namespace logging {
// Event ID for the log messages we generate.
extern const GUID kLogEventId;
// Feature enable mask for LogEventProvider.
enum LogEnableMask {
// If this bit is set in our provider enable mask, we will include
// a stack trace with every log message.
ENABLE_STACK_TRACE_CAPTURE = 0x0001,
// If this bit is set in our provider enable mask, the provider will log
// a LOG message with only the textual content of the message, and no
// stack trace.
ENABLE_LOG_MESSAGE_ONLY = 0x0002,
};
// The message types our log event provider generates.
// ETW likes user message types to start at 10.
enum LogMessageTypes {
// A textual only log message, contains a zero-terminated string.
LOG_MESSAGE = 10,
// A message with a stack trace, followed by the zero-terminated
// message text.
LOG_MESSAGE_WITH_STACKTRACE = 11,
// A message with:
// a stack trace,
// the line number as a four byte integer,
// the file as a zero terminated UTF8 string,
// the zero-terminated UTF8 message text.
LOG_MESSAGE_FULL = 12,
};
// Trace provider class to drive log control and transport
// with Event Tracing for Windows.
class BASE_API LogEventProvider : public base::win::EtwTraceProvider {
public:
static LogEventProvider* GetInstance();
static bool LogMessage(logging::LogSeverity severity, const char* file,
int line, size_t message_start, const std::string& str);
static void Initialize(const GUID& provider_name);
static void Uninitialize();
protected:
// Overridden to manipulate the log level on ETW control callbacks.
virtual void OnEventsEnabled();
virtual void OnEventsDisabled();
private:
LogEventProvider();
// The log severity prior to OnEventsEnabled,
// restored in OnEventsDisabled.
logging::LogSeverity old_log_level_;
friend struct StaticMemorySingletonTraits<LogEventProvider>;
DISALLOW_COPY_AND_ASSIGN(LogEventProvider);
};
} // namespace logging
#endif // BASE_LOGGING_WIN_H_
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