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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file contains the Windows-specific exporting to ETW.
#ifndef BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_
#define BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_
#include <stdint.h>
#include <windows.h>
#include <map>
#include <memory>
#include "base/base_export.h"
#include "base/strings/string_piece.h"
#include "base/trace_event/trace_event_impl.h"
#include "base/trace_event/trace_logging_minimal_win.h"
namespace base {
template <typename Type>
struct StaticMemorySingletonTraits;
namespace trace_event {
class BASE_EXPORT TraceEventETWExport {
public:
TraceEventETWExport(const TraceEventETWExport&) = delete;
TraceEventETWExport& operator=(const TraceEventETWExport&) = delete;
~TraceEventETWExport();
// Retrieves the singleton.
// Note that this may return NULL post-AtExit processing.
static TraceEventETWExport* GetInstance();
// Retrieves the singleton iff it was previously instantiated by a
// GetInstance() call. Avoids creating the instance only to check that it
// wasn't disabled. Note that, like GetInstance(), this may also return NULL
// post-AtExit processing.
static TraceEventETWExport* GetInstanceIfExists();
// Enables exporting of events to ETW. If tracing is disabled for the Chrome
// provider, AddEvent and AddCustomEvent will simply return when called.
static void EnableETWExport();
// Exports an event to ETW. This is mainly used in
// TraceLog::AddTraceEventWithThreadIdAndTimestamp to export internal events.
static void AddEvent(char phase,
const unsigned char* category_group_enabled,
const char* name,
unsigned long long id,
TimeTicks timestamp,
const TraceArguments* args);
// Exports an ETW event that marks the end of a complete event.
static void AddCompleteEndEvent(const unsigned char* category_group_enabled,
const char* name);
// Returns true if any category in the group is enabled.
static bool IsCategoryGroupEnabled(StringPiece category_group_name);
private:
// Ensure only the provider can construct us.
friend struct StaticMemorySingletonTraits<TraceEventETWExport>;
TraceEventETWExport();
// Called from the ETW EnableCallback when the state of the provider or
// keywords has changed.
void OnETWEnableUpdate(TlmProvider::EventControlCode enabled);
// Updates the list of enabled categories by consulting the ETW keyword.
// Returns true if there was a change, false otherwise.
bool UpdateEnabledCategories();
static uint64_t CategoryGroupToKeyword(const uint8_t* category_state);
// Returns true if the category is enabled.
bool IsCategoryEnabled(StringPiece category_name) const;
bool is_registration_complete_ = false;
// The keywords that were enabled last time the callback was made.
uint64_t etw_match_any_keyword_ = 0;
// The provider is set based on channel for MSEdge, in other Chromium
// based browsers all channels use the same GUID/provider.
std::unique_ptr<TlmProvider> etw_provider_;
// Maps category names to their status (enabled/disabled).
std::map<StringPiece, bool> categories_status_;
// Maps category names to their keyword.
std::map<StringPiece, uint64_t> categories_keyword_;
};
} // namespace trace_event
} // namespace base
#endif // BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_
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