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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_LOGGING_WIN_H_
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#define BASE_LOGGING_WIN_H_
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#include <stddef.h>
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#include <string>
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#include "base/base_export.h"
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#include "base/logging.h"
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#include "base/win/event_trace_provider.h"
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namespace base {
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template <typename Type>
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struct StaticMemorySingletonTraits;
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} // namespace base
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namespace logging {
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// Event ID for the log messages we generate.
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EXTERN_C BASE_EXPORT const GUID kLogEventId;
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// Feature enable mask for LogEventProvider.
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enum LogEnableMask {
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// If this bit is set in our provider enable mask, we will include
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// a stack trace with every log message.
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ENABLE_STACK_TRACE_CAPTURE = 0x0001,
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// If this bit is set in our provider enable mask, the provider will log
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// a LOG message with only the textual content of the message, and no
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// stack trace.
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ENABLE_LOG_MESSAGE_ONLY = 0x0002,
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};
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// The message types our log event provider generates.
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// ETW likes user message types to start at 10.
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enum LogMessageTypes {
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// A textual only log message, contains a zero-terminated string.
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LOG_MESSAGE = 10,
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// A message with a stack trace, followed by the zero-terminated
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// message text.
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LOG_MESSAGE_WITH_STACKTRACE = 11,
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// A message with:
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// a stack trace,
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// the line number as a four byte integer,
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// the file as a zero terminated UTF8 string,
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// the zero-terminated UTF8 message text.
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LOG_MESSAGE_FULL = 12,
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};
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// Trace provider class to drive log control and transport
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// with Event Tracing for Windows.
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class BASE_EXPORT LogEventProvider : public base::win::EtwTraceProvider {
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public:
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LogEventProvider(const LogEventProvider&) = delete;
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LogEventProvider& operator=(const LogEventProvider&) = delete;
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static LogEventProvider* GetInstance();
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static bool LogMessage(logging::LogSeverity severity, const char* file,
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int line, size_t message_start, const std::string& str);
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static void Initialize(const GUID& provider_name);
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static void Uninitialize();
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protected:
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// Overridden to manipulate the log level on ETW control callbacks.
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void OnEventsEnabled() override;
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void OnEventsDisabled() override;
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private:
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LogEventProvider();
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// The log severity prior to OnEventsEnabled,
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// restored in OnEventsDisabled.
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logging::LogSeverity old_log_level_;
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friend struct base::StaticMemorySingletonTraits<LogEventProvider>;
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};
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} // namespace logging
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#endif // BASE_LOGGING_WIN_H_
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