|  | // Copyright 2015 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_TRACE_EVENT_COMMON_TRACE_EVENT_COMMON_H_ | 
|  | #define BASE_TRACE_EVENT_COMMON_TRACE_EVENT_COMMON_H_ | 
|  |  | 
|  | // This header file defines the set of trace_event macros without specifying | 
|  | // how the events actually get collected and stored. If you need to expose trace | 
|  | // events to some other universe, you can copy-and-paste this file as well as | 
|  | // trace_event.h, modifying the macros contained there as necessary for the | 
|  | // target platform. The end result is that multiple libraries can funnel events | 
|  | // through to a shared trace event collector. | 
|  |  | 
|  | // IMPORTANT: To avoid conflicts, if you need to modify this file for a library, | 
|  | // land your change in base/ first, and then copy-and-paste it. | 
|  |  | 
|  | // Trace events are for tracking application performance and resource usage. | 
|  | // Macros are provided to track: | 
|  | //    Begin and end of function calls | 
|  | //    Counters | 
|  | // | 
|  | // Events are issued against categories. Whereas LOG's | 
|  | // categories are statically defined, TRACE categories are created | 
|  | // implicitly with a string. For example: | 
|  | //   TRACE_EVENT_INSTANT0("MY_SUBSYSTEM", "SomeImportantEvent", | 
|  | //                        TRACE_EVENT_SCOPE_THREAD) | 
|  | // | 
|  | // It is often the case that one trace may belong in multiple categories at the | 
|  | // same time. The first argument to the trace can be a comma-separated list of | 
|  | // categories, forming a category group, like: | 
|  | // | 
|  | // TRACE_EVENT_INSTANT0("input,views", "OnMouseOver", TRACE_EVENT_SCOPE_THREAD) | 
|  | // | 
|  | // We can enable/disable tracing of OnMouseOver by enabling/disabling either | 
|  | // category. | 
|  | // | 
|  | // Events can be INSTANT, or can be pairs of BEGIN and END in the same scope: | 
|  | //   TRACE_EVENT_BEGIN0("MY_SUBSYSTEM", "SomethingCostly") | 
|  | //   doSomethingCostly() | 
|  | //   TRACE_EVENT_END0("MY_SUBSYSTEM", "SomethingCostly") | 
|  | // Note: our tools can't always determine the correct BEGIN/END pairs unless | 
|  | // these are used in the same scope. Use ASYNC_BEGIN/ASYNC_END macros if you | 
|  | // need them to be in separate scopes. | 
|  | // | 
|  | // A common use case is to trace entire function scopes. This | 
|  | // issues a trace BEGIN and END automatically: | 
|  | //   void doSomethingCostly() { | 
|  | //     TRACE_EVENT0("MY_SUBSYSTEM", "doSomethingCostly"); | 
|  | //     ... | 
|  | //   } | 
|  | // | 
|  | // Additional parameters can be associated with an event: | 
|  | //   void doSomethingCostly2(int howMuch) { | 
|  | //     TRACE_EVENT1("MY_SUBSYSTEM", "doSomethingCostly", | 
|  | //         "howMuch", howMuch); | 
|  | //     ... | 
|  | //   } | 
|  | // | 
|  | // The trace system will automatically add to this information the | 
|  | // current process id, thread id, and a timestamp in microseconds. | 
|  | // | 
|  | // To trace an asynchronous procedure such as an IPC send/receive, use | 
|  | // ASYNC_BEGIN and ASYNC_END: | 
|  | //   [single threaded sender code] | 
|  | //     static int send_count = 0; | 
|  | //     ++send_count; | 
|  | //     TRACE_EVENT_ASYNC_BEGIN0("ipc", "message", send_count); | 
|  | //     Send(new MyMessage(send_count)); | 
|  | //   [receive code] | 
|  | //     void OnMyMessage(send_count) { | 
|  | //       TRACE_EVENT_ASYNC_END0("ipc", "message", send_count); | 
|  | //     } | 
|  | // The third parameter is a unique ID to match ASYNC_BEGIN/ASYNC_END pairs. | 
|  | // ASYNC_BEGIN and ASYNC_END can occur on any thread of any traced process. | 
|  | // Pointers can be used for the ID parameter, and they will be mangled | 
|  | // internally so that the same pointer on two different processes will not | 
|  | // match. For example: | 
|  | //   class MyTracedClass { | 
|  | //    public: | 
|  | //     MyTracedClass() { | 
|  | //       TRACE_EVENT_ASYNC_BEGIN0("category", "MyTracedClass", this); | 
|  | //     } | 
|  | //     ~MyTracedClass() { | 
|  | //       TRACE_EVENT_ASYNC_END0("category", "MyTracedClass", this); | 
|  | //     } | 
|  | //   } | 
|  | // | 
|  | // Trace event also supports counters, which is a way to track a quantity | 
|  | // as it varies over time. Counters are created with the following macro: | 
|  | //   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter", g_myCounterValue); | 
|  | // | 
|  | // Counters are process-specific. The macro itself can be issued from any | 
|  | // thread, however. | 
|  | // | 
|  | // Sometimes, you want to track two counters at once. You can do this with two | 
|  | // counter macros: | 
|  | //   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter0", g_myCounterValue[0]); | 
|  | //   TRACE_COUNTER1("MY_SUBSYSTEM", "myCounter1", g_myCounterValue[1]); | 
|  | // Or you can do it with a combined macro: | 
|  | //   TRACE_COUNTER2("MY_SUBSYSTEM", "myCounter", | 
|  | //       "bytesPinned", g_myCounterValue[0], | 
|  | //       "bytesAllocated", g_myCounterValue[1]); | 
|  | // This indicates to the tracing UI that these counters should be displayed | 
|  | // in a single graph, as a summed area chart. | 
|  | // | 
|  | // Since counters are in a global namespace, you may want to disambiguate with a | 
|  | // unique ID, by using the TRACE_COUNTER_ID* variations. | 
|  | // | 
|  | // By default, trace collection is compiled in, but turned off at runtime. | 
|  | // Collecting trace data is the responsibility of the embedding | 
|  | // application. In Chrome's case, navigating to about:tracing will turn on | 
|  | // tracing and display data collected across all active processes. | 
|  | // | 
|  | // | 
|  | // Memory scoping note: | 
|  | // Tracing copies the pointers, not the string content, of the strings passed | 
|  | // in for category_group, name, and arg_names.  Thus, the following code will | 
|  | // cause problems: | 
|  | //     char* str = strdup("importantName"); | 
|  | //     TRACE_EVENT_INSTANT0("SUBSYSTEM", str);  // BAD! | 
|  | //     free(str);                   // Trace system now has dangling pointer | 
|  | // | 
|  | // To avoid this issue with the |name| and |arg_name| parameters, use the | 
|  | // TRACE_EVENT_COPY_XXX overloads of the macros at additional runtime overhead. | 
|  | // Notes: The category must always be in a long-lived char* (i.e. static const). | 
|  | //        The |arg_values|, when used, are always deep copied with the _COPY | 
|  | //        macros. | 
|  | // | 
|  | // When are string argument values copied: | 
|  | // const char* arg_values are only referenced by default: | 
|  | //     TRACE_EVENT1("category", "name", | 
|  | //                  "arg1", "literal string is only referenced"); | 
|  | // Use TRACE_STR_COPY to force copying of a const char*: | 
|  | //     TRACE_EVENT1("category", "name", | 
|  | //                  "arg1", TRACE_STR_COPY("string will be copied")); | 
|  | // std::string arg_values are always copied: | 
|  | //     TRACE_EVENT1("category", "name", | 
|  | //                  "arg1", std::string("string will be copied")); | 
|  | // | 
|  | // | 
|  | // Convertable notes: | 
|  | // Converting a large data type to a string can be costly. To help with this, | 
|  | // the trace framework provides an interface ConvertableToTraceFormat. If you | 
|  | // inherit from it and implement the AppendAsTraceFormat method the trace | 
|  | // framework will call back to your object to convert a trace output time. This | 
|  | // means, if the category for the event is disabled, the conversion will not | 
|  | // happen. | 
|  | // | 
|  | //   class MyData : public base::trace_event::ConvertableToTraceFormat { | 
|  | //    public: | 
|  | //     MyData() {} | 
|  | //     void AppendAsTraceFormat(std::string* out) const override { | 
|  | //       out->append("{\"foo\":1}"); | 
|  | //     } | 
|  | //    private: | 
|  | //     ~MyData() override {} | 
|  | //     DISALLOW_COPY_AND_ASSIGN(MyData); | 
|  | //   }; | 
|  | // | 
|  | //   TRACE_EVENT1("foo", "bar", "data", | 
|  | //                std::unique_ptr<ConvertableToTraceFormat>(new MyData())); | 
|  | // | 
|  | // The trace framework will take ownership if the passed pointer and it will | 
|  | // be free'd when the trace buffer is flushed. | 
|  | // | 
|  | // Note, we only do the conversion when the buffer is flushed, so the provided | 
|  | // data object should not be modified after it's passed to the trace framework. | 
|  | // | 
|  | // | 
|  | // Thread Safety: | 
|  | // A thread safe singleton and mutex are used for thread safety. Category | 
|  | // enabled flags are used to limit the performance impact when the system | 
|  | // is not enabled. | 
|  | // | 
|  | // TRACE_EVENT macros first cache a pointer to a category. The categories are | 
|  | // statically allocated and safe at all times, even after exit. Fetching a | 
|  | // category is protected by the TraceLog::lock_. Multiple threads initializing | 
|  | // the static variable is safe, as they will be serialized by the lock and | 
|  | // multiple calls will return the same pointer to the category. | 
|  | // | 
|  | // Then the category_group_enabled flag is checked. This is a unsigned char, and | 
|  | // not intended to be multithread safe. It optimizes access to AddTraceEvent | 
|  | // which is threadsafe internally via TraceLog::lock_. The enabled flag may | 
|  | // cause some threads to incorrectly call or skip calling AddTraceEvent near | 
|  | // the time of the system being enabled or disabled. This is acceptable as | 
|  | // we tolerate some data loss while the system is being enabled/disabled and | 
|  | // because AddTraceEvent is threadsafe internally and checks the enabled state | 
|  | // again under lock. | 
|  | // | 
|  | // Without the use of these static category pointers and enabled flags all | 
|  | // trace points would carry a significant performance cost of acquiring a lock | 
|  | // and resolving the category. | 
|  |  | 
|  | // Check that nobody includes this file directly.  Clients are supposed to | 
|  | // include the surrounding "trace_event.h" of their project instead. | 
|  | #if defined(TRACE_EVENT0) | 
|  | #error "Another copy of this file has already been included." | 
|  | #endif | 
|  |  | 
|  | // This will mark the trace event as disabled by default. The user will need | 
|  | // to explicitly enable the event. | 
|  | #define TRACE_DISABLED_BY_DEFAULT(name) "disabled-by-default-" name | 
|  |  | 
|  | // Records a pair of begin and end events called "name" for the current | 
|  | // scope, with 0, 1 or 2 associated arguments. If the category is not | 
|  | // enabled, then this does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_EVENT0(category_group, name)    \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name) | 
|  | #define TRACE_EVENT_WITH_FLOW0(category_group, name, bind_id, flow_flags)  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name, bind_id, \ | 
|  | flow_flags) | 
|  | #define TRACE_EVENT1(category_group, name, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_WITH_FLOW1(category_group, name, bind_id, flow_flags,  \ | 
|  | arg1_name, arg1_val)                        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name, bind_id, \ | 
|  | flow_flags, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT2(category_group, name, arg1_name, arg1_val, arg2_name,   \ | 
|  | arg2_val)                                               \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED(category_group, name, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_WITH_FLOW2(category_group, name, bind_id, flow_flags,    \ | 
|  | arg1_name, arg1_val, arg2_name, arg2_val)     \ | 
|  | INTERNAL_TRACE_EVENT_ADD_SCOPED_WITH_FLOW(category_group, name, bind_id,   \ | 
|  | flow_flags, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  |  | 
|  | // Records a single event called "name" immediately, with 0, 1 or 2 | 
|  | // associated arguments. If the category is not enabled, then this | 
|  | // does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_EVENT_INSTANT0(category_group, name, scope)                   \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE | scope) | 
|  | #define TRACE_EVENT_INSTANT1(category_group, name, scope, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name,    \ | 
|  | TRACE_EVENT_FLAG_NONE | scope, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_INSTANT2(category_group, name, scope, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                              \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name,    \ | 
|  | TRACE_EVENT_FLAG_NONE | scope, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_INSTANT0(category_group, name, scope)              \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY | scope) | 
|  | #define TRACE_EVENT_COPY_INSTANT1(category_group, name, scope, arg1_name,   \ | 
|  | arg1_val)                                 \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY | scope, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_INSTANT2(category_group, name, scope, arg1_name,      \ | 
|  | arg1_val, arg2_name, arg2_val)               \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, category_group, name,    \ | 
|  | TRACE_EVENT_FLAG_COPY | scope, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  |  | 
|  | #define TRACE_EVENT_INSTANT_WITH_TIMESTAMP0(category_group, name, scope, \ | 
|  | timestamp)                   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                               \ | 
|  | TRACE_EVENT_PHASE_INSTANT, category_group, name, timestamp,        \ | 
|  | TRACE_EVENT_FLAG_NONE | scope) | 
|  |  | 
|  | #define TRACE_EVENT_INSTANT_WITH_TIMESTAMP1(category_group, name, scope,  \ | 
|  | timestamp, arg_name, arg_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                \ | 
|  | TRACE_EVENT_PHASE_INSTANT, category_group, name, timestamp,         \ | 
|  | TRACE_EVENT_FLAG_NONE | scope, arg_name, arg_val) | 
|  |  | 
|  | // Records a single BEGIN event called "name" immediately, with 0, 1 or 2 | 
|  | // associated arguments. If the category is not enabled, then this | 
|  | // does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_EVENT_BEGIN0(category_group, name)                          \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_BEGIN1(category_group, name, arg1_name, arg1_val)     \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_BEGIN2(category_group, name, arg1_name, arg1_val,     \ | 
|  | arg2_name, arg2_val)                           \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val,    \ | 
|  | arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_BEGIN0(category_group, name)                     \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_BEGIN1(category_group, name, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name,  \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_BEGIN2(category_group, name, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                       \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, category_group, name,  \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val,     \ | 
|  | arg2_name, arg2_val) | 
|  |  | 
|  | // Similar to TRACE_EVENT_BEGINx but with a custom |at| timestamp provided. | 
|  | // - |id| is used to match the _BEGIN event with the _END event. | 
|  | //   Events are considered to match if their category_group, name and id values | 
|  | //   all match. |id| must either be a pointer or an integer value up to 64 bits. | 
|  | //   If it's a pointer, the bits will be xored with a hash of the process ID so | 
|  | //   that the same pointer on two different processes will not collide. | 
|  | #define TRACE_EVENT_BEGIN_WITH_ID_TID_AND_TIMESTAMP0(category_group, name, id, \ | 
|  | thread_id, timestamp)     \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id,      \ | 
|  | timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP0(                \ | 
|  | category_group, name, id, thread_id, timestamp)                       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                     \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP1(                \ | 
|  | category_group, name, id, thread_id, timestamp, arg1_name, arg1_val)  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                     \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_BEGIN_WITH_ID_TID_AND_TIMESTAMP2(                \ | 
|  | category_group, name, id, thread_id, timestamp, arg1_name, arg1_val,  \ | 
|  | arg2_name, arg2_val)                                                  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                     \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id, thread_id, \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name,   \ | 
|  | arg2_val) | 
|  |  | 
|  | // Records a single END event for "name" immediately. If the category | 
|  | // is not enabled, then this does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_EVENT_END0(category_group, name)                          \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_END1(category_group, name, arg1_name, arg1_val)     \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_END2(category_group, name, arg1_name, arg1_val, arg2_name, \ | 
|  | arg2_val)                                             \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name,        \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val,         \ | 
|  | arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_END0(category_group, name)                     \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_END1(category_group, name, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name,  \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_END2(category_group, name, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                       \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, category_group, name,  \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val,   \ | 
|  | arg2_name, arg2_val) | 
|  |  | 
|  | #define TRACE_EVENT_MARK_WITH_TIMESTAMP0(category_group, name, timestamp) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                \ | 
|  | TRACE_EVENT_PHASE_MARK, category_group, name, timestamp,            \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  |  | 
|  | #define TRACE_EVENT_MARK_WITH_TIMESTAMP1(category_group, name, timestamp, \ | 
|  | arg1_name, arg1_val)             \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                \ | 
|  | TRACE_EVENT_PHASE_MARK, category_group, name, timestamp,            \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  |  | 
|  | #define TRACE_EVENT_MARK_WITH_TIMESTAMP2(                                      \ | 
|  | category_group, name, timestamp, arg1_name, arg1_val, arg2_name, arg2_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                     \ | 
|  | TRACE_EVENT_PHASE_MARK, category_group, name, timestamp,                 \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | #define TRACE_EVENT_COPY_MARK(category_group, name)                      \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_MARK, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  |  | 
|  | #define TRACE_EVENT_COPY_MARK_WITH_TIMESTAMP(category_group, name, timestamp) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                    \ | 
|  | TRACE_EVENT_PHASE_MARK, category_group, name, timestamp,                \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  |  | 
|  | // Similar to TRACE_EVENT_ENDx but with a custom |at| timestamp provided. | 
|  | // - |id| is used to match the _BEGIN event with the _END event. | 
|  | //   Events are considered to match if their category_group, name and id values | 
|  | //   all match. |id| must either be a pointer or an integer value up to 64 bits. | 
|  | //   If it's a pointer, the bits will be xored with a hash of the process ID so | 
|  | //   that the same pointer on two different processes will not collide. | 
|  | #define TRACE_EVENT_END_WITH_ID_TID_AND_TIMESTAMP0(category_group, name, id, \ | 
|  | thread_id, timestamp)     \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                        \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id,      \ | 
|  | timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP0(                \ | 
|  | category_group, name, id, thread_id, timestamp)                     \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                   \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id, \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP1(                 \ | 
|  | category_group, name, id, thread_id, timestamp, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                    \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id,  \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_END_WITH_ID_TID_AND_TIMESTAMP2(                 \ | 
|  | category_group, name, id, thread_id, timestamp, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                                                 \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                    \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id, thread_id,  \ | 
|  | timestamp, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name,  \ | 
|  | arg2_val) | 
|  |  | 
|  | // Records the value of a counter called "name" immediately. Value | 
|  | // must be representable as a 32 bit integer. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_COUNTER1(category_group, name, value)                         \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE, "value",                  \ | 
|  | static_cast<int>(value)) | 
|  | #define TRACE_COPY_COUNTER1(category_group, name, value)                    \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY, "value",                  \ | 
|  | static_cast<int>(value)) | 
|  |  | 
|  | // Records the values of a multi-parted counter called "name" immediately. | 
|  | // The UI will treat value1 and value2 as parts of a whole, displaying their | 
|  | // values as a stacked-bar chart. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | #define TRACE_COUNTER2(category_group, name, value1_name, value1_val,       \ | 
|  | value2_name, value2_val)                             \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_NONE, value1_name,              \ | 
|  | static_cast<int>(value1_val), value2_name,       \ | 
|  | static_cast<int>(value2_val)) | 
|  | #define TRACE_COPY_COUNTER2(category_group, name, value1_name, value1_val,  \ | 
|  | value2_name, value2_val)                        \ | 
|  | INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, category_group, name, \ | 
|  | TRACE_EVENT_FLAG_COPY, value1_name,              \ | 
|  | static_cast<int>(value1_val), value2_name,       \ | 
|  | static_cast<int>(value2_val)) | 
|  |  | 
|  | // Similar to TRACE_COUNTERx, but with a custom |timestamp| provided. | 
|  | #define TRACE_COUNTER_WITH_TIMESTAMP1(category_group, name, timestamp, value) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                    \ | 
|  | TRACE_EVENT_PHASE_COUNTER, category_group, name, timestamp,             \ | 
|  | TRACE_EVENT_FLAG_NONE, "value", static_cast<int>(value)) | 
|  |  | 
|  | #define TRACE_COUNTER_WITH_TIMESTAMP2(category_group, name, timestamp,      \ | 
|  | value1_name, value1_val, value2_name, \ | 
|  | value2_val)                           \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                  \ | 
|  | TRACE_EVENT_PHASE_COUNTER, category_group, name, timestamp,           \ | 
|  | TRACE_EVENT_FLAG_NONE, value1_name, static_cast<int>(value1_val),     \ | 
|  | value2_name, static_cast<int>(value2_val)) | 
|  |  | 
|  | // Records the value of a counter called "name" immediately. Value | 
|  | // must be representable as a 32 bit integer. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | // - |id| is used to disambiguate counters with the same name. It must either | 
|  | //   be a pointer or an integer value up to 64 bits. If it's a pointer, the bits | 
|  | //   will be xored with a hash of the process ID so that the same pointer on | 
|  | //   two different processes will not collide. | 
|  | #define TRACE_COUNTER_ID1(category_group, name, id, value)                    \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE, "value",  \ | 
|  | static_cast<int>(value)) | 
|  | #define TRACE_COPY_COUNTER_ID1(category_group, name, id, value)               \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_COPY, "value",  \ | 
|  | static_cast<int>(value)) | 
|  |  | 
|  | // Records the values of a multi-parted counter called "name" immediately. | 
|  | // The UI will treat value1 and value2 as parts of a whole, displaying their | 
|  | // values as a stacked-bar chart. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | // - |id| is used to disambiguate counters with the same name. It must either | 
|  | //   be a pointer or an integer value up to 64 bits. If it's a pointer, the bits | 
|  | //   will be xored with a hash of the process ID so that the same pointer on | 
|  | //   two different processes will not collide. | 
|  | #define TRACE_COUNTER_ID2(category_group, name, id, value1_name, value1_val,  \ | 
|  | value2_name, value2_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE,           \ | 
|  | value1_name, static_cast<int>(value1_val), \ | 
|  | value2_name, static_cast<int>(value2_val)) | 
|  | #define TRACE_COPY_COUNTER_ID2(category_group, name, id, value1_name,         \ | 
|  | value1_val, value2_name, value2_val)           \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_COPY,           \ | 
|  | value1_name, static_cast<int>(value1_val), \ | 
|  | value2_name, static_cast<int>(value2_val)) | 
|  |  | 
|  | // TRACE_EVENT_SAMPLE_* events are injected by the sampling profiler. | 
|  | #define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP0(category_group, name,       \ | 
|  | thread_id, timestamp)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  |  | 
|  | #define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP1(                            \ | 
|  | category_group, name, thread_id, timestamp, arg1_name, arg1_val)           \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  |  | 
|  | #define TRACE_EVENT_SAMPLE_WITH_TID_AND_TIMESTAMP2(category_group, name,       \ | 
|  | thread_id, timestamp,       \ | 
|  | arg1_name, arg1_val,        \ | 
|  | arg2_name, arg2_val)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_SAMPLE, category_group, name, 0, thread_id, timestamp, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | #define TRACE_EVENT_SAMPLE_WITH_ID1(category_group, name, id, arg1_name,       \ | 
|  | arg1_val)                                  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_SAMPLE, category_group,   \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE, arg1_name, \ | 
|  | arg1_val) | 
|  |  | 
|  | // ASYNC_STEP_* APIs should be only used by legacy code. New code should | 
|  | // consider using NESTABLE_ASYNC_* APIs to describe substeps within an async | 
|  | // event. | 
|  | // Records a single ASYNC_BEGIN event called "name" immediately, with 0, 1 or 2 | 
|  | // associated arguments. If the category is not enabled, then this | 
|  | // does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | // - |id| is used to match the ASYNC_BEGIN event with the ASYNC_END event. ASYNC | 
|  | //   events are considered to match if their category_group, name and id values | 
|  | //   all match. |id| must either be a pointer or an integer value up to 64 bits. | 
|  | //   If it's a pointer, the bits will be xored with a hash of the process ID so | 
|  | //   that the same pointer on two different processes will not collide. | 
|  | // | 
|  | // An asynchronous operation can consist of multiple phases. The first phase is | 
|  | // defined by the ASYNC_BEGIN calls. Additional phases can be defined using the | 
|  | // ASYNC_STEP_INTO or ASYNC_STEP_PAST macros. The ASYNC_STEP_INTO macro will | 
|  | // annotate the block following the call. The ASYNC_STEP_PAST macro will | 
|  | // annotate the block prior to the call. Note that any particular event must use | 
|  | // only STEP_INTO or STEP_PAST macros; they can not mix and match. When the | 
|  | // operation completes, call ASYNC_END. | 
|  | // | 
|  | // An ASYNC trace typically occurs on a single thread (if not, they will only be | 
|  | // drawn on the thread defined in the ASYNC_BEGIN event), but all events in that | 
|  | // operation must use the same |name| and |id|. Each step can have its own | 
|  | // args. | 
|  | #define TRACE_EVENT_ASYNC_BEGIN0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ | 
|  | category_group, name, id,      \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_ASYNC_BEGIN1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN,     \ | 
|  | category_group, name, id,          \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_ASYNC_BEGIN2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                   \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,        \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_BEGIN0(category_group, name, id)   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ | 
|  | category_group, name, id,      \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_ASYNC_BEGIN1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN,          \ | 
|  | category_group, name, id,               \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_BEGIN2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                        \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,             \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | // Similar to TRACE_EVENT_ASYNC_BEGINx but with a custom |at| timestamp | 
|  | // provided. | 
|  | #define TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, name, id, \ | 
|  | timestamp)                \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                     \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,            \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP1(                           \ | 
|  | category_group, name, id, timestamp, arg1_name, arg1_val)              \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                      \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,             \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE, \ | 
|  | arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_ASYNC_BEGIN_WITH_TIMESTAMP2(category_group, name, id,      \ | 
|  | timestamp, arg1_name,          \ | 
|  | arg1_val, arg2_name, arg2_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,                 \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE,     \ | 
|  | arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, name, id, \ | 
|  | timestamp)                \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_ASYNC_BEGIN, category_group, name, id,                 \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_COPY) | 
|  |  | 
|  | // Records a single ASYNC_STEP_INTO event for |step| immediately. If the | 
|  | // category is not enabled, then this does nothing. The |name| and |id| must | 
|  | // match the ASYNC_BEGIN event above. The |step| param identifies this step | 
|  | // within the async event. This should be called at the beginning of the next | 
|  | // phase of an asynchronous operation. The ASYNC_BEGIN event must not have any | 
|  | // ASYNC_STEP_PAST events. | 
|  | #define TRACE_EVENT_ASYNC_STEP_INTO0(category_group, name, id, step)  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \ | 
|  | category_group, name, id,          \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step) | 
|  | #define TRACE_EVENT_ASYNC_STEP_INTO1(category_group, name, id, step, \ | 
|  | arg1_name, arg1_val)            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                  \ | 
|  | TRACE_EVENT_PHASE_ASYNC_STEP_INTO, category_group, name, id,   \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step, arg1_name, arg1_val) | 
|  |  | 
|  | // Similar to TRACE_EVENT_ASYNC_STEP_INTOx but with a custom |at| timestamp | 
|  | // provided. | 
|  | #define TRACE_EVENT_ASYNC_STEP_INTO_WITH_TIMESTAMP0(category_group, name, id, \ | 
|  | step, timestamp)          \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                         \ | 
|  | TRACE_EVENT_PHASE_ASYNC_STEP_INTO, category_group, name, id,            \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE,    \ | 
|  | "step", step) | 
|  |  | 
|  | // Records a single ASYNC_STEP_PAST event for |step| immediately. If the | 
|  | // category is not enabled, then this does nothing. The |name| and |id| must | 
|  | // match the ASYNC_BEGIN event above. The |step| param identifies this step | 
|  | // within the async event. This should be called at the beginning of the next | 
|  | // phase of an asynchronous operation. The ASYNC_BEGIN event must not have any | 
|  | // ASYNC_STEP_INTO events. | 
|  | #define TRACE_EVENT_ASYNC_STEP_PAST0(category_group, name, id, step)  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_PAST, \ | 
|  | category_group, name, id,          \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step) | 
|  | #define TRACE_EVENT_ASYNC_STEP_PAST1(category_group, name, id, step, \ | 
|  | arg1_name, arg1_val)            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                  \ | 
|  | TRACE_EVENT_PHASE_ASYNC_STEP_PAST, category_group, name, id,   \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step, arg1_name, arg1_val) | 
|  |  | 
|  | // Records a single ASYNC_END event for "name" immediately. If the category | 
|  | // is not enabled, then this does nothing. | 
|  | #define TRACE_EVENT_ASYNC_END0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ | 
|  | category_group, name, id,    \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_ASYNC_END1(category_group, name, id, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END,               \ | 
|  | category_group, name, id,                  \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_ASYNC_END2(category_group, name, id, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                           \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                           \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,                  \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_END0(category_group, name, id)   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ | 
|  | category_group, name, id,    \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_ASYNC_END1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END,          \ | 
|  | category_group, name, id,             \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_END2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                      \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,             \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | // Similar to TRACE_EVENT_ASYNC_ENDx but with a custom |at| timestamp provided. | 
|  | #define TRACE_EVENT_ASYNC_END_WITH_TIMESTAMP0(category_group, name, id, \ | 
|  | timestamp)                \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                   \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,            \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_ASYNC_END_WITH_TIMESTAMP1(category_group, name, id,       \ | 
|  | timestamp, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                         \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,                  \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE,    \ | 
|  | arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_ASYNC_END_WITH_TIMESTAMP2(category_group, name, id,       \ | 
|  | timestamp, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                         \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,                  \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE,    \ | 
|  | arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_ASYNC_END_WITH_TIMESTAMP0(category_group, name, id, \ | 
|  | timestamp)                \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                        \ | 
|  | TRACE_EVENT_PHASE_ASYNC_END, category_group, name, id,                 \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_COPY) | 
|  |  | 
|  | // NESTABLE_ASYNC_* APIs are used to describe an async operation, which can | 
|  | // be nested within a NESTABLE_ASYNC event and/or have inner NESTABLE_ASYNC | 
|  | // events. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | // - A pair of NESTABLE_ASYNC_BEGIN event and NESTABLE_ASYNC_END event is | 
|  | //   considered as a match if their category_group, name and id all match. | 
|  | // - |id| must either be a pointer or an integer value up to 64 bits. | 
|  | //   If it's a pointer, the bits will be xored with a hash of the process ID so | 
|  | //   that the same pointer on two different processes will not collide. | 
|  | // - |id| is used to match a child NESTABLE_ASYNC event with its parent | 
|  | //   NESTABLE_ASYNC event. Therefore, events in the same nested event tree must | 
|  | //   be logged using the same id and category_group. | 
|  | // | 
|  | // Unmatched NESTABLE_ASYNC_END event will be parsed as an event that starts | 
|  | // at the first NESTABLE_ASYNC event of that id, and unmatched | 
|  | // NESTABLE_ASYNC_BEGIN event will be parsed as an event that ends at the last | 
|  | // NESTABLE_ASYNC event of that id. Corresponding warning messages for | 
|  | // unmatched events will be shown in the analysis view. | 
|  |  | 
|  | // Records a single NESTABLE_ASYNC_BEGIN event called "name" immediately, with | 
|  | // 0, 1 or 2 associated arguments. If the category is not enabled, then this | 
|  | // does nothing. | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \ | 
|  | category_group, name, id,               \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN,     \ | 
|  | category_group, name, id,                   \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_BEGIN2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                            \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id,        \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | // Records a single NESTABLE_ASYNC_END event called "name" immediately, with 0 | 
|  | // or 2 associated arguments. If the category is not enabled, then this does | 
|  | // nothing. | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_END0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \ | 
|  | category_group, name, id,             \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | // Records a single NESTABLE_ASYNC_END event called "name" immediately, with 1 | 
|  | // associated argument. If the category is not enabled, then this does nothing. | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_END1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END,     \ | 
|  | category_group, name, id,                 \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_END2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                          \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id,        \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | // Records a single NESTABLE_ASYNC_INSTANT event called "name" immediately, | 
|  | // with none, one or two associated argument. If the category is not enabled, | 
|  | // then this does nothing. | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_INSTANT0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, \ | 
|  | category_group, name, id,                 \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  |  | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_INSTANT1(category_group, name, id,        \ | 
|  | arg1_name, arg1_val)             \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, \ | 
|  | category_group, name, id,                 \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  |  | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_INSTANT2(                              \ | 
|  | category_group, name, id, arg1_name, arg1_val, arg2_name, arg2_val)   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                       \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, category_group, name, id, \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | #define TRACE_EVENT_COPY_NESTABLE_ASYNC_BEGIN_WITH_TTS2(                       \ | 
|  | category_group, name, id, arg1_name, arg1_val, arg2_name, arg2_val)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                            \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id,        \ | 
|  | TRACE_EVENT_FLAG_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_NESTABLE_ASYNC_END_WITH_TTS2(                         \ | 
|  | category_group, name, id, arg1_name, arg1_val, arg2_name, arg2_val)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                            \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id,          \ | 
|  | TRACE_EVENT_FLAG_ASYNC_TTS | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val) | 
|  |  | 
|  | // Similar to TRACE_EVENT_NESTABLE_ASYNC_{BEGIN,END}x but with a custom | 
|  | // |timestamp| provided. | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_BEGIN_WITH_TIMESTAMP0(category_group, name, \ | 
|  | id, timestamp)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id,        \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_END_WITH_TIMESTAMP0(category_group, name, \ | 
|  | id, timestamp)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                        \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id,        \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_END_WITH_TIMESTAMP1(                    \ | 
|  | category_group, name, id, timestamp, arg1_name, arg1_val)              \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                      \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id,      \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE, \ | 
|  | arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_NESTABLE_ASYNC_INSTANT_WITH_TIMESTAMP0(               \ | 
|  | category_group, name, id, timestamp)                                  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                     \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT, category_group, name, id, \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_COPY_NESTABLE_ASYNC_BEGIN_WITH_TIMESTAMP0(          \ | 
|  | category_group, name, id, timestamp)                                \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                   \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id, \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_NESTABLE_ASYNC_END_WITH_TIMESTAMP0(          \ | 
|  | category_group, name, id, timestamp)                              \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                 \ | 
|  | TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, category_group, name, id, \ | 
|  | TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_COPY) | 
|  |  | 
|  | // Records a single FLOW_BEGIN event called "name" immediately, with 0, 1 or 2 | 
|  | // associated arguments. If the category is not enabled, then this | 
|  | // does nothing. | 
|  | // - category and name strings must have application lifetime (statics or | 
|  | //   literals). They may not include " chars. | 
|  | // - |id| is used to match the FLOW_BEGIN event with the FLOW_END event. FLOW | 
|  | //   events are considered to match if their category_group, name and id values | 
|  | //   all match. |id| must either be a pointer or an integer value up to 64 bits. | 
|  | //   If it's a pointer, the bits will be xored with a hash of the process ID so | 
|  | //   that the same pointer on two different processes will not collide. | 
|  | // FLOW events are different from ASYNC events in how they are drawn by the | 
|  | // tracing UI. A FLOW defines asynchronous data flow, such as posting a task | 
|  | // (FLOW_BEGIN) and later executing that task (FLOW_END). Expect FLOWs to be | 
|  | // drawn as lines or arrows from FLOW_BEGIN scopes to FLOW_END scopes. Similar | 
|  | // to ASYNC, a FLOW can consist of multiple phases. The first phase is defined | 
|  | // by the FLOW_BEGIN calls. Additional phases can be defined using the FLOW_STEP | 
|  | // macros. When the operation completes, call FLOW_END. An async operation can | 
|  | // span threads and processes, but all events in that operation must use the | 
|  | // same |name| and |id|. Each event can have its own args. | 
|  | #define TRACE_EVENT_FLOW_BEGIN0(category_group, name, id)        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ | 
|  | category_group, name, id,     \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_FLOW_BEGIN1(category_group, name, id, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN,               \ | 
|  | category_group, name, id,                   \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_FLOW_BEGIN2(category_group, name, id, arg1_name, arg1_val, \ | 
|  | arg2_name, arg2_val)                           \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                            \ | 
|  | TRACE_EVENT_PHASE_FLOW_BEGIN, category_group, name, id,                  \ | 
|  | TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_FLOW_BEGIN0(category_group, name, id)   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ | 
|  | category_group, name, id,     \ | 
|  | TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_FLOW_BEGIN1(category_group, name, id, arg1_name, \ | 
|  | arg1_val)                            \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN,          \ | 
|  | category_group, name, id,              \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_FLOW_BEGIN2(category_group, name, id, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val)       \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                       \ | 
|  | TRACE_EVENT_PHASE_FLOW_BEGIN, category_group, name, id,             \ | 
|  | TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | // Records a single FLOW_STEP event for |step| immediately. If the category | 
|  | // is not enabled, then this does nothing. The |name| and |id| must match the | 
|  | // FLOW_BEGIN event above. The |step| param identifies this step within the | 
|  | // async event. This should be called at the beginning of the next phase of an | 
|  | // asynchronous operation. | 
|  | #define TRACE_EVENT_FLOW_STEP0(category_group, name, id, step)  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \ | 
|  | category_group, name, id,    \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step) | 
|  | #define TRACE_EVENT_FLOW_STEP1(category_group, name, id, step, arg1_name, \ | 
|  | arg1_val)                                  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                       \ | 
|  | TRACE_EVENT_PHASE_FLOW_STEP, category_group, name, id,              \ | 
|  | TRACE_EVENT_FLAG_NONE, "step", step, arg1_name, arg1_val) | 
|  | #define TRACE_EVENT_COPY_FLOW_STEP0(category_group, name, id, step) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP,     \ | 
|  | category_group, name, id,        \ | 
|  | TRACE_EVENT_FLAG_COPY, "step", step) | 
|  | #define TRACE_EVENT_COPY_FLOW_STEP1(category_group, name, id, step, arg1_name, \ | 
|  | arg1_val)                                  \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                            \ | 
|  | TRACE_EVENT_PHASE_FLOW_STEP, category_group, name, id,                   \ | 
|  | TRACE_EVENT_FLAG_COPY, "step", step, arg1_name, arg1_val) | 
|  |  | 
|  | // Records a single FLOW_END event for "name" immediately. If the category | 
|  | // is not enabled, then this does nothing. | 
|  | #define TRACE_EVENT_FLOW_END0(category_group, name, id)                        \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_FLOW_END_BIND_TO_ENCLOSING0(category_group, name, id)      \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id,                                   \ | 
|  | TRACE_EVENT_FLAG_BIND_TO_ENCLOSING) | 
|  | #define TRACE_EVENT_FLOW_END1(category_group, name, id, arg1_name, arg1_val)   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE, arg1_name, \ | 
|  | arg1_val) | 
|  | #define TRACE_EVENT_FLOW_END2(category_group, name, id, arg1_name, arg1_val,   \ | 
|  | arg2_name, arg2_val)                             \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_NONE, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val) | 
|  | #define TRACE_EVENT_COPY_FLOW_END0(category_group, name, id)                   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_COPY) | 
|  | #define TRACE_EVENT_COPY_FLOW_END1(category_group, name, id, arg1_name,        \ | 
|  | arg1_val)                                   \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_COPY, arg1_name, \ | 
|  | arg1_val) | 
|  | #define TRACE_EVENT_COPY_FLOW_END2(category_group, name, id, arg1_name,        \ | 
|  | arg1_val, arg2_name, arg2_val)              \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, category_group, \ | 
|  | name, id, TRACE_EVENT_FLAG_COPY, arg1_name, \ | 
|  | arg1_val, arg2_name, arg2_val) | 
|  |  | 
|  | // Special trace event macro to trace task execution with the location where it | 
|  | // was posted from. | 
|  | #define TRACE_TASK_EXECUTION(run_function, task) \ | 
|  | INTERNAL_TRACE_TASK_EXECUTION(run_function, task) | 
|  |  | 
|  | // TRACE_EVENT_METADATA* events are information related to other | 
|  | // injected events, not events in their own right. | 
|  | #define TRACE_EVENT_METADATA1(category_group, name, arg1_name, arg1_val) \ | 
|  | INTERNAL_TRACE_EVENT_METADATA_ADD(category_group, name, arg1_name, arg1_val) | 
|  |  | 
|  | // Records a clock sync event. | 
|  | #define TRACE_EVENT_CLOCK_SYNC_RECEIVER(sync_id)                               \ | 
|  | INTERNAL_TRACE_EVENT_ADD(                                                    \ | 
|  | TRACE_EVENT_PHASE_CLOCK_SYNC, "__metadata", "clock_sync",                \ | 
|  | TRACE_EVENT_FLAG_NONE, "sync_id", sync_id) | 
|  | #define TRACE_EVENT_CLOCK_SYNC_ISSUER(sync_id, issue_ts, issue_end_ts)         \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_TIMESTAMP(                                     \ | 
|  | TRACE_EVENT_PHASE_CLOCK_SYNC, "__metadata", "clock_sync",                \ | 
|  | issue_end_ts, TRACE_EVENT_FLAG_NONE,                                     \ | 
|  | "sync_id", sync_id, "issue_ts", issue_ts) | 
|  |  | 
|  | // Macros to track the life time and value of arbitrary client objects. | 
|  | // See also TraceTrackableObject. | 
|  | #define TRACE_EVENT_OBJECT_CREATED_WITH_ID(category_group, name, id) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                  \ | 
|  | TRACE_EVENT_PHASE_CREATE_OBJECT, category_group, name, id,     \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  |  | 
|  | #define TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(category_group, name, id, \ | 
|  | snapshot)                 \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                   \ | 
|  | TRACE_EVENT_PHASE_SNAPSHOT_OBJECT, category_group, name,        \ | 
|  | id, TRACE_EVENT_FLAG_NONE, "snapshot", snapshot) | 
|  |  | 
|  | #define TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID_AND_TIMESTAMP(                     \ | 
|  | category_group, name, id, timestamp, snapshot)                             \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP(                          \ | 
|  | TRACE_EVENT_PHASE_SNAPSHOT_OBJECT, category_group, name,                 \ | 
|  | id, TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_NONE, \ | 
|  | "snapshot", snapshot) | 
|  |  | 
|  | #define TRACE_EVENT_OBJECT_DELETED_WITH_ID(category_group, name, id) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                  \ | 
|  | TRACE_EVENT_PHASE_DELETE_OBJECT, category_group, name, id,     \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  |  | 
|  | // Records entering and leaving trace event contexts. |category_group| and | 
|  | // |name| specify the context category and type. |context| is a | 
|  | // snapshotted context object id. | 
|  | #define TRACE_EVENT_ENTER_CONTEXT(category_group, name, context)      \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                   \ | 
|  | TRACE_EVENT_PHASE_ENTER_CONTEXT, category_group, name, context, \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_LEAVE_CONTEXT(category_group, name, context)      \ | 
|  | INTERNAL_TRACE_EVENT_ADD_WITH_ID(                                   \ | 
|  | TRACE_EVENT_PHASE_LEAVE_CONTEXT, category_group, name, context, \ | 
|  | TRACE_EVENT_FLAG_NONE) | 
|  | #define TRACE_EVENT_SCOPED_CONTEXT(category_group, name, context) \ | 
|  | INTERNAL_TRACE_EVENT_SCOPED_CONTEXT(category_group, name, context) | 
|  |  | 
|  | // Macro to specify that two trace IDs are identical. For example, | 
|  | // TRACE_LINK_IDS( | 
|  | //     "category", "name", | 
|  | //     TRACE_ID_WITH_SCOPE("net::URLRequest", 0x1000), | 
|  | //     TRACE_ID_WITH_SCOPE("blink::ResourceFetcher::FetchRequest", 0x2000)) | 
|  | // tells the trace consumer that events with ID ("net::URLRequest", 0x1000) from | 
|  | // the current process have the same ID as events with ID | 
|  | // ("blink::ResourceFetcher::FetchRequest", 0x2000). | 
|  | #define TRACE_LINK_IDS(category_group, name, id, linked_id) \ | 
|  | INTERNAL_TRACE_EVENT_ADD_LINK_IDS(category_group, name, id, linked_id); | 
|  |  | 
|  | // Macro to efficiently determine if a given category group is enabled. | 
|  | #define TRACE_EVENT_CATEGORY_GROUP_ENABLED(category_group, ret)             \ | 
|  | do {                                                                      \ | 
|  | INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                 \ | 
|  | if (INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE()) { \ | 
|  | *ret = true;                                                          \ | 
|  | } else {                                                                \ | 
|  | *ret = false;                                                         \ | 
|  | }                                                                       \ | 
|  | } while (0) | 
|  |  | 
|  | // Macro to explicitly warm up a given category group. This could be useful in | 
|  | // cases where we want to initialize a category group before any trace events | 
|  | // for that category group is reported. For example, to have a category group | 
|  | // always show up in the "record categories" list for manually selecting | 
|  | // settings in about://tracing. | 
|  | #define TRACE_EVENT_WARMUP_CATEGORY(category_group) \ | 
|  | INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group) | 
|  |  | 
|  | // Macro to efficiently determine, through polling, if a new trace has begun. | 
|  | #define TRACE_EVENT_IS_NEW_TRACE(ret)                                      \ | 
|  | do {                                                                     \ | 
|  | static int INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = 0;          \ | 
|  | int num_traces_recorded = TRACE_EVENT_API_GET_NUM_TRACES_RECORDED();   \ | 
|  | if (num_traces_recorded != -1 &&                                       \ | 
|  | num_traces_recorded !=                                             \ | 
|  | INTERNAL_TRACE_EVENT_UID(lastRecordingNumber)) {               \ | 
|  | INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = num_traces_recorded; \ | 
|  | *ret = true;                                                         \ | 
|  | } else {                                                               \ | 
|  | *ret = false;                                                        \ | 
|  | }                                                                      \ | 
|  | } while (0) | 
|  |  | 
|  | // Macro for getting the real base::TimeTicks::Now() which can be overridden in | 
|  | // headless when VirtualTime is enabled. | 
|  | #define TRACE_TIME_TICKS_NOW() INTERNAL_TRACE_TIME_TICKS_NOW() | 
|  |  | 
|  | // Macro for getting the real base::Time::Now() which can be overridden in | 
|  | // headless when VirtualTime is enabled. | 
|  | #define TRACE_TIME_NOW() INTERNAL_TRACE_TIME_NOW() | 
|  |  | 
|  | // Notes regarding the following definitions: | 
|  | // New values can be added and propagated to third party libraries, but existing | 
|  | // definitions must never be changed, because third party libraries may use old | 
|  | // definitions. | 
|  |  | 
|  | // Phase indicates the nature of an event entry. E.g. part of a begin/end pair. | 
|  | #define TRACE_EVENT_PHASE_BEGIN ('B') | 
|  | #define TRACE_EVENT_PHASE_END ('E') | 
|  | #define TRACE_EVENT_PHASE_COMPLETE ('X') | 
|  | #define TRACE_EVENT_PHASE_INSTANT ('I') | 
|  | #define TRACE_EVENT_PHASE_ASYNC_BEGIN ('S') | 
|  | #define TRACE_EVENT_PHASE_ASYNC_STEP_INTO ('T') | 
|  | #define TRACE_EVENT_PHASE_ASYNC_STEP_PAST ('p') | 
|  | #define TRACE_EVENT_PHASE_ASYNC_END ('F') | 
|  | #define TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN ('b') | 
|  | #define TRACE_EVENT_PHASE_NESTABLE_ASYNC_END ('e') | 
|  | #define TRACE_EVENT_PHASE_NESTABLE_ASYNC_INSTANT ('n') | 
|  | #define TRACE_EVENT_PHASE_FLOW_BEGIN ('s') | 
|  | #define TRACE_EVENT_PHASE_FLOW_STEP ('t') | 
|  | #define TRACE_EVENT_PHASE_FLOW_END ('f') | 
|  | #define TRACE_EVENT_PHASE_METADATA ('M') | 
|  | #define TRACE_EVENT_PHASE_COUNTER ('C') | 
|  | #define TRACE_EVENT_PHASE_SAMPLE ('P') | 
|  | #define TRACE_EVENT_PHASE_CREATE_OBJECT ('N') | 
|  | #define TRACE_EVENT_PHASE_SNAPSHOT_OBJECT ('O') | 
|  | #define TRACE_EVENT_PHASE_DELETE_OBJECT ('D') | 
|  | #define TRACE_EVENT_PHASE_MEMORY_DUMP ('v') | 
|  | #define TRACE_EVENT_PHASE_MARK ('R') | 
|  | #define TRACE_EVENT_PHASE_CLOCK_SYNC ('c') | 
|  | #define TRACE_EVENT_PHASE_ENTER_CONTEXT ('(') | 
|  | #define TRACE_EVENT_PHASE_LEAVE_CONTEXT (')') | 
|  | #define TRACE_EVENT_PHASE_LINK_IDS ('=') | 
|  |  | 
|  | // Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT. | 
|  | #define TRACE_EVENT_FLAG_NONE (static_cast<unsigned int>(0)) | 
|  | #define TRACE_EVENT_FLAG_COPY (static_cast<unsigned int>(1 << 0)) | 
|  | #define TRACE_EVENT_FLAG_HAS_ID (static_cast<unsigned int>(1 << 1)) | 
|  | // TODO(crbug.com/639003): Free this bit after ID mangling is deprecated. | 
|  | #define TRACE_EVENT_FLAG_MANGLE_ID (static_cast<unsigned int>(1 << 2)) | 
|  | #define TRACE_EVENT_FLAG_SCOPE_OFFSET (static_cast<unsigned int>(1 << 3)) | 
|  | #define TRACE_EVENT_FLAG_SCOPE_EXTRA (static_cast<unsigned int>(1 << 4)) | 
|  | #define TRACE_EVENT_FLAG_EXPLICIT_TIMESTAMP (static_cast<unsigned int>(1 << 5)) | 
|  | #define TRACE_EVENT_FLAG_ASYNC_TTS (static_cast<unsigned int>(1 << 6)) | 
|  | #define TRACE_EVENT_FLAG_BIND_TO_ENCLOSING (static_cast<unsigned int>(1 << 7)) | 
|  | #define TRACE_EVENT_FLAG_FLOW_IN (static_cast<unsigned int>(1 << 8)) | 
|  | #define TRACE_EVENT_FLAG_FLOW_OUT (static_cast<unsigned int>(1 << 9)) | 
|  | #define TRACE_EVENT_FLAG_HAS_CONTEXT_ID (static_cast<unsigned int>(1 << 10)) | 
|  | #define TRACE_EVENT_FLAG_HAS_PROCESS_ID (static_cast<unsigned int>(1 << 11)) | 
|  | #define TRACE_EVENT_FLAG_HAS_LOCAL_ID (static_cast<unsigned int>(1 << 12)) | 
|  | #define TRACE_EVENT_FLAG_HAS_GLOBAL_ID (static_cast<unsigned int>(1 << 13)) | 
|  |  | 
|  | #define TRACE_EVENT_FLAG_SCOPE_MASK                          \ | 
|  | (static_cast<unsigned int>(TRACE_EVENT_FLAG_SCOPE_OFFSET | \ | 
|  | TRACE_EVENT_FLAG_SCOPE_EXTRA)) | 
|  |  | 
|  | // Type values for identifying types in the TraceValue union. | 
|  | #define TRACE_VALUE_TYPE_BOOL (static_cast<unsigned char>(1)) | 
|  | #define TRACE_VALUE_TYPE_UINT (static_cast<unsigned char>(2)) | 
|  | #define TRACE_VALUE_TYPE_INT (static_cast<unsigned char>(3)) | 
|  | #define TRACE_VALUE_TYPE_DOUBLE (static_cast<unsigned char>(4)) | 
|  | #define TRACE_VALUE_TYPE_POINTER (static_cast<unsigned char>(5)) | 
|  | #define TRACE_VALUE_TYPE_STRING (static_cast<unsigned char>(6)) | 
|  | #define TRACE_VALUE_TYPE_COPY_STRING (static_cast<unsigned char>(7)) | 
|  | #define TRACE_VALUE_TYPE_CONVERTABLE (static_cast<unsigned char>(8)) | 
|  |  | 
|  | // Enum reflecting the scope of an INSTANT event. Must fit within | 
|  | // TRACE_EVENT_FLAG_SCOPE_MASK. | 
|  | #define TRACE_EVENT_SCOPE_GLOBAL (static_cast<unsigned char>(0 << 3)) | 
|  | #define TRACE_EVENT_SCOPE_PROCESS (static_cast<unsigned char>(1 << 3)) | 
|  | #define TRACE_EVENT_SCOPE_THREAD (static_cast<unsigned char>(2 << 3)) | 
|  |  | 
|  | #define TRACE_EVENT_SCOPE_NAME_GLOBAL ('g') | 
|  | #define TRACE_EVENT_SCOPE_NAME_PROCESS ('p') | 
|  | #define TRACE_EVENT_SCOPE_NAME_THREAD ('t') | 
|  |  | 
|  | #endif  // BASE_TRACE_EVENT_COMMON_TRACE_EVENT_COMMON_H_ |