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| 1 // Copyright 2015 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 // This file contains the Windows-specific exporting to ETW. | |
| 6 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_ | |
| 7 #define BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_ | |
| 8 | |
| 9 #include <map> | |
| 10 | |
| 11 #include "base/base_export.h" | |
| 12 #include "base/strings/string_piece.h" | |
| 13 #include "base/trace_event/trace_event_impl.h" | |
| 14 | |
| 15 // Fwd. | |
| 16 template <typename Type> | |
| 17 struct StaticMemorySingletonTraits; | |
| 18 | |
| 19 namespace base { | |
| 20 namespace trace_event { | |
| 21 | |
| 22 class BASE_EXPORT TraceEventETWExport { | |
| 23 public: | |
| 24 ~TraceEventETWExport(); | |
| 25 | |
| 26 // Retrieves the singleton. | |
| 27 // Note that this may return NULL post-AtExit processing. | |
| 28 static TraceEventETWExport* GetInstance(); | |
| 29 | |
| 30 // Enables/disables exporting of events to ETW. If disabled, | |
| 31 // AddEvent and AddCustomEvent will simply return when called. | |
| 32 static void EnableETWExport(); | |
| 33 static void DisableETWExport(); | |
| 34 | |
| 35 // Returns true if ETW is enabled. For now, this is true if the command line | |
| 36 // flag is specified. | |
| 37 static bool IsETWExportEnabled(); | |
| 38 | |
| 39 // Exports an event to ETW. This is mainly used in | |
| 40 // TraceLog::AddTraceEventWithThreadIdAndTimestamp to export internal events. | |
| 41 static void AddEvent( | |
| 42 char phase, | |
| 43 const unsigned char* category_group_enabled, | |
| 44 const char* name, | |
| 45 unsigned long long id, | |
| 46 int num_args, | |
| 47 const char** arg_names, | |
| 48 const unsigned char* arg_types, | |
| 49 const unsigned long long* arg_values, | |
| 50 const scoped_refptr<ConvertableToTraceFormat>* convertable_values); | |
| 51 | |
| 52 // Exports an event to ETW. This should be used when exporting an event only | |
| 53 // to ETW. Supports three arguments to be passed to ETW. | |
| 54 // TODO(georgesak): Allow different providers. | |
| 55 static void AddCustomEvent(const char* name, | |
| 56 const char* phase, | |
| 57 const char* arg_name_1, | |
| 58 const char* arg_value_1, | |
| 59 const char* arg_name_2, | |
| 60 const char* arg_value_2, | |
| 61 const char* arg_name_3, | |
| 62 const char* arg_value_3); | |
| 63 | |
| 64 // Returns true if any category in the group is enabled. | |
| 65 static bool IsCategoryGroupEnabled(const char* category_group_name); | |
| 66 | |
| 67 private: | |
| 68 // Ensure only the provider can construct us. | |
| 69 friend struct StaticMemorySingletonTraits<TraceEventETWExport>; | |
| 70 TraceEventETWExport(); | |
| 71 | |
| 72 // Updates the list of enabled categories by consulting the ETW keyword. | |
| 73 // Returns true if there was a change, false otherwise. | |
| 74 bool UpdateEnabledCategories(); | |
| 75 | |
| 76 // Returns true if the category is enabled. | |
| 77 bool IsCategoryEnabled(const char* category_name) const; | |
| 78 | |
| 79 // True if ETW is enabled. Allows hiding the exporting behind a flag. | |
| 80 bool etw_export_enabled_; | |
| 81 | |
| 82 // Maps category names to their status (enabled/disabled). | |
| 83 std::map<base::StringPiece, bool> categories_status_; | |
| 84 | |
| 85 // Local copy of the ETW keyword. | |
| 86 uint64 etw_match_any_keyword_; | |
| 87 | |
| 88 DISALLOW_COPY_AND_ASSIGN(TraceEventETWExport); | |
| 89 }; | |
| 90 | |
| 91 } // namespace trace_event | |
| 92 } // namespace base | |
| 93 | |
| 94 #endif // BASE_TRACE_EVENT_TRACE_EVENT_ETW_EXPORT_WIN_H_ | |
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