// Copyright (c) 2012 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 under third_party_mods/chromium or at: // http://src.chromium.org/svn/trunk/src/LICENSE #ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_EVENT_H_ #define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_EVENT_H_ #include #include "webrtc/system_wrappers/interface/event_tracer.h" #if defined(TRACE_EVENT0) #error "Another copy of trace_event.h has already been included." #endif // Extracted from Chromium's src/base/debug/trace_event.h. // This header is designed to give you trace_event macros without specifying // how the events actually get collected and stored. If you need to expose trace // event to some other universe, you can copy-and-paste this file, // implement the TRACE_EVENT_API macros, and do any other necessary fixup for // the target platform. The end result is that multiple libraries can funnel // events through to a shared trace event collector. // 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") // // 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 disembiguate 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, name, and arg_names. Thus, the following code will // cause problems: // char* str = strdup("impprtantName"); // 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")); // // // Thread Safety: // Thread safety is provided by methods defined in event_tracer.h. See the file // for details. // By default, const char* argument values are assumed to have long-lived scope // and will not be copied. Use this macro to force a const char* to be copied. #define TRACE_STR_COPY(str) \ webrtc::trace_event_internal::TraceStringWithCopy(str) // By default, uint64 ID argument values are not mangled with the Process ID in // TRACE_EVENT_ASYNC macros. Use this macro to force Process ID mangling. #define TRACE_ID_MANGLE(id) \ webrtc::trace_event_internal::TraceID::ForceMangle(id) // 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, name) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name) #define TRACE_EVENT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val) #define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) // Same as TRACE_EVENT except that they are not included in official builds. #ifdef OFFICIAL_BUILD #define UNSHIPPED_TRACE_EVENT0(category, name) (void)0 #define UNSHIPPED_TRACE_EVENT1(category, name, arg1_name, arg1_val) (void)0 #define UNSHIPPED_TRACE_EVENT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) (void)0 #define UNSHIPPED_TRACE_EVENT_INSTANT0(category, name) (void)0 #define UNSHIPPED_TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \ (void)0 #define UNSHIPPED_TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) (void)0 #else #define UNSHIPPED_TRACE_EVENT0(category, name) \ TRACE_EVENT0(category, name) #define UNSHIPPED_TRACE_EVENT1(category, name, arg1_name, arg1_val) \ TRACE_EVENT1(category, name, arg1_name, arg1_val) #define UNSHIPPED_TRACE_EVENT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) #define UNSHIPPED_TRACE_EVENT_INSTANT0(category, name) \ TRACE_EVENT_INSTANT0(category, name) #define UNSHIPPED_TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \ TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) #define UNSHIPPED_TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) #endif // 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, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_INSTANT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_INSTANT0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_INSTANT1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_INSTANT2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_INSTANT, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, \ arg2_name, arg2_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, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_BEGIN1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_BEGIN2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_BEGIN0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_BEGIN1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_BEGIN2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_BEGIN, \ category, name, 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, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_END1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_END2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \ arg2_name, arg2_val) #define TRACE_EVENT_COPY_END0(category, name) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_END1(category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_END2(category, name, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_END, \ category, name, 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, name, value) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_NONE, \ "value", static_cast(value)) #define TRACE_COPY_COUNTER1(category, name, value) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_COPY, \ "value", static_cast(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, name, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_NONE, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) #define TRACE_COPY_COUNTER2(category, name, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD(TRACE_EVENT_PHASE_COUNTER, \ category, name, TRACE_EVENT_FLAG_COPY, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(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, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ "value", static_cast(value)) #define TRACE_COPY_COUNTER_ID1(category, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ "value", static_cast(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, name, id, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) #define TRACE_COPY_COUNTER_ID2(category, name, id, value1_name, value1_val, \ value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_COUNTER, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ value1_name, static_cast(value1_val), \ value2_name, static_cast(value2_val)) // 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, 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 macros. When the operation completes, call ASYNC_END. // An ASYNC trace typically occur 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 event can have its own // args. #define TRACE_EVENT_ASYNC_BEGIN0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_ASYNC_BEGIN0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val, arg2_name, arg2_val) // Records a single ASYNC_STEP 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. #define TRACE_EVENT_ASYNC_STEP0(category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step) #define TRACE_EVENT_ASYNC_STEP1(category, name, id, step, \ arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_STEP0(category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \ category, name, id, TRACE_EVENT_FLAG_COPY, "step", step) #define TRACE_EVENT_COPY_ASYNC_STEP1(category, name, id, step, \ arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP, \ category, name, id, TRACE_EVENT_FLAG_COPY, "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, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_ASYNC_END0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val, arg2_name, arg2_val) // 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, 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, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_FLOW_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_FLOW_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_FLOW_BEGIN0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_FLOW_BEGIN1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_FLOW_BEGIN2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_BEGIN, \ category, 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, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step) #define TRACE_EVENT_FLOW_STEP1(category, name, id, step, \ arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \ category, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_FLOW_STEP0(category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \ category, name, id, TRACE_EVENT_FLAG_COPY, "step", step) #define TRACE_EVENT_COPY_FLOW_STEP1(category, name, id, step, \ arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_STEP, \ category, 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, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_FLOW_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_FLOW_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_NONE, \ arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_FLOW_END0(category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_FLOW_END1(category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val) #define TRACE_EVENT_COPY_FLOW_END2(category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_FLOW_END, \ category, name, id, TRACE_EVENT_FLAG_COPY, \ arg1_name, arg1_val, arg2_name, arg2_val) //////////////////////////////////////////////////////////////////////////////// // Implementation specific tracing API definitions. // Get a pointer to the enabled state of the given trace category. Only // long-lived literal strings should be given as the category name. The returned // pointer can be held permanently in a local static for example. If the // unsigned char is non-zero, tracing is enabled. If tracing is enabled, // TRACE_EVENT_API_ADD_TRACE_EVENT can be called. It's OK if tracing is disabled // between the load of the tracing state and the call to // TRACE_EVENT_API_ADD_TRACE_EVENT, because this flag only provides an early out // for best performance when tracing is disabled. // const unsigned char* // TRACE_EVENT_API_GET_CATEGORY_ENABLED(const char* category_name) #define TRACE_EVENT_API_GET_CATEGORY_ENABLED \ webrtc::EventTracer::GetCategoryEnabled // Add a trace event to the platform tracing system. // void TRACE_EVENT_API_ADD_TRACE_EVENT( // char phase, // const unsigned char* category_enabled, // const char* name, // unsigned long long id, // int num_args, // const char** arg_names, // const unsigned char* arg_types, // const unsigned long long* arg_values, // unsigned char flags) #define TRACE_EVENT_API_ADD_TRACE_EVENT webrtc::EventTracer::AddTraceEvent //////////////////////////////////////////////////////////////////////////////// // Implementation detail: trace event macros create temporary variables // to keep instrumentation overhead low. These macros give each temporary // variable a unique name based on the line number to prevent name collissions. #define INTERNAL_TRACE_EVENT_UID3(a,b) \ trace_event_unique_##a##b #define INTERNAL_TRACE_EVENT_UID2(a,b) \ INTERNAL_TRACE_EVENT_UID3(a,b) #define INTERNAL_TRACE_EVENT_UID(name_prefix) \ INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__) // Implementation detail: internal macro to create static category. #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category) \ static const unsigned char* INTERNAL_TRACE_EVENT_UID(catstatic) = 0; \ if (!INTERNAL_TRACE_EVENT_UID(catstatic)) { \ INTERNAL_TRACE_EVENT_UID(catstatic) = \ TRACE_EVENT_API_GET_CATEGORY_ENABLED(category); \ } // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD(phase, category, name, flags, ...) \ do { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ if (*INTERNAL_TRACE_EVENT_UID(catstatic)) { \ webrtc::trace_event_internal::AddTraceEvent( \ phase, INTERNAL_TRACE_EVENT_UID(catstatic), name, \ webrtc::trace_event_internal::kNoEventId, flags, ##__VA_ARGS__); \ } \ } while (0) // Implementation detail: internal macro to create static category and add begin // event if the category is enabled. Also adds the end event when the scope // ends. #define INTERNAL_TRACE_EVENT_ADD_SCOPED(category, name, ...) \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ webrtc::trace_event_internal::TraceEndOnScopeClose \ INTERNAL_TRACE_EVENT_UID(profileScope); \ if (*INTERNAL_TRACE_EVENT_UID(catstatic)) { \ webrtc::trace_event_internal::AddTraceEvent( \ TRACE_EVENT_PHASE_BEGIN, \ INTERNAL_TRACE_EVENT_UID(catstatic), \ name, webrtc::trace_event_internal::kNoEventId, \ TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \ INTERNAL_TRACE_EVENT_UID(profileScope).Initialize( \ INTERNAL_TRACE_EVENT_UID(catstatic), name); \ } // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD_WITH_ID(phase, category, name, id, flags, \ ...) \ do { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category); \ if (*INTERNAL_TRACE_EVENT_UID(catstatic)) { \ unsigned char trace_event_flags = flags | TRACE_EVENT_FLAG_HAS_ID; \ webrtc::trace_event_internal::TraceID trace_event_trace_id( \ id, &trace_event_flags); \ webrtc::trace_event_internal::AddTraceEvent( \ phase, INTERNAL_TRACE_EVENT_UID(catstatic), \ name, trace_event_trace_id.data(), trace_event_flags, \ ##__VA_ARGS__); \ } \ } while (0) // 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_INSTANT ('I') #define TRACE_EVENT_PHASE_ASYNC_BEGIN ('S') #define TRACE_EVENT_PHASE_ASYNC_STEP ('T') #define TRACE_EVENT_PHASE_ASYNC_END ('F') #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') // Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT. #define TRACE_EVENT_FLAG_NONE (static_cast(0)) #define TRACE_EVENT_FLAG_COPY (static_cast(1 << 0)) #define TRACE_EVENT_FLAG_HAS_ID (static_cast(1 << 1)) #define TRACE_EVENT_FLAG_MANGLE_ID (static_cast(1 << 2)) // Type values for identifying types in the TraceValue union. #define TRACE_VALUE_TYPE_BOOL (static_cast(1)) #define TRACE_VALUE_TYPE_UINT (static_cast(2)) #define TRACE_VALUE_TYPE_INT (static_cast(3)) #define TRACE_VALUE_TYPE_DOUBLE (static_cast(4)) #define TRACE_VALUE_TYPE_POINTER (static_cast(5)) #define TRACE_VALUE_TYPE_STRING (static_cast(6)) #define TRACE_VALUE_TYPE_COPY_STRING (static_cast(7)) namespace webrtc { namespace trace_event_internal { // Specify these values when the corresponding argument of AddTraceEvent is not // used. const int kZeroNumArgs = 0; const unsigned long long kNoEventId = 0; // TraceID encapsulates an ID that can either be an integer or pointer. Pointers // are mangled with the Process ID so that they are unlikely to collide when the // same pointer is used on different processes. class TraceID { public: class ForceMangle { public: explicit ForceMangle(unsigned long long id) : data_(id) {} explicit ForceMangle(unsigned long id) : data_(id) {} explicit ForceMangle(unsigned int id) : data_(id) {} explicit ForceMangle(unsigned short id) : data_(id) {} explicit ForceMangle(unsigned char id) : data_(id) {} explicit ForceMangle(long long id) : data_(static_cast(id)) {} explicit ForceMangle(long id) : data_(static_cast(id)) {} explicit ForceMangle(int id) : data_(static_cast(id)) {} explicit ForceMangle(short id) : data_(static_cast(id)) {} explicit ForceMangle(signed char id) : data_(static_cast(id)) {} unsigned long long data() const { return data_; } private: unsigned long long data_; }; explicit TraceID(const void* id, unsigned char* flags) : data_(static_cast( reinterpret_cast(id))) { *flags |= TRACE_EVENT_FLAG_MANGLE_ID; } explicit TraceID(ForceMangle id, unsigned char* flags) : data_(id.data()) { *flags |= TRACE_EVENT_FLAG_MANGLE_ID; } explicit TraceID(unsigned long long id, unsigned char* flags) : data_(id) { (void)flags; } explicit TraceID(unsigned long id, unsigned char* flags) : data_(id) { (void)flags; } explicit TraceID(unsigned int id, unsigned char* flags) : data_(id) { (void)flags; } explicit TraceID(unsigned short id, unsigned char* flags) : data_(id) { (void)flags; } explicit TraceID(unsigned char id, unsigned char* flags) : data_(id) { (void)flags; } explicit TraceID(long long id, unsigned char* flags) : data_(static_cast(id)) { (void)flags; } explicit TraceID(long id, unsigned char* flags) : data_(static_cast(id)) { (void)flags; } explicit TraceID(int id, unsigned char* flags) : data_(static_cast(id)) { (void)flags; } explicit TraceID(short id, unsigned char* flags) : data_(static_cast(id)) { (void)flags; } explicit TraceID(signed char id, unsigned char* flags) : data_(static_cast(id)) { (void)flags; } unsigned long long data() const { return data_; } private: unsigned long long data_; }; // Simple union to store various types as unsigned long long. union TraceValueUnion { bool as_bool; unsigned long long as_uint; long long as_int; double as_double; const void* as_pointer; const char* as_string; }; // Simple container for const char* that should be copied instead of retained. class TraceStringWithCopy { public: explicit TraceStringWithCopy(const char* str) : str_(str) {} operator const char* () const { return str_; } private: const char* str_; }; // Define SetTraceValue for each allowed type. It stores the type and // value in the return arguments. This allows this API to avoid declaring any // structures so that it is portable to third_party libraries. #define INTERNAL_DECLARE_SET_TRACE_VALUE(actual_type, \ union_member, \ value_type_id) \ static inline void SetTraceValue(actual_type arg, \ unsigned char* type, \ unsigned long long* value) { \ TraceValueUnion type_value; \ type_value.union_member = arg; \ *type = value_type_id; \ *value = type_value.as_uint; \ } // Simpler form for int types that can be safely casted. #define INTERNAL_DECLARE_SET_TRACE_VALUE_INT(actual_type, \ value_type_id) \ static inline void SetTraceValue(actual_type arg, \ unsigned char* type, \ unsigned long long* value) { \ *type = value_type_id; \ *value = static_cast(arg); \ } INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned long long, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned long, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned int, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned short, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned char, TRACE_VALUE_TYPE_UINT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(long long, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(long, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(int, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(short, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE_INT(signed char, TRACE_VALUE_TYPE_INT) INTERNAL_DECLARE_SET_TRACE_VALUE(bool, as_bool, TRACE_VALUE_TYPE_BOOL) INTERNAL_DECLARE_SET_TRACE_VALUE(double, as_double, TRACE_VALUE_TYPE_DOUBLE) INTERNAL_DECLARE_SET_TRACE_VALUE(const void*, as_pointer, TRACE_VALUE_TYPE_POINTER) INTERNAL_DECLARE_SET_TRACE_VALUE(const char*, as_string, TRACE_VALUE_TYPE_STRING) INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy&, as_string, TRACE_VALUE_TYPE_COPY_STRING) #undef INTERNAL_DECLARE_SET_TRACE_VALUE #undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT // std::string version of SetTraceValue so that trace arguments can be strings. static inline void SetTraceValue(const std::string& arg, unsigned char* type, unsigned long long* value) { TraceValueUnion type_value; type_value.as_string = arg.c_str(); *type = TRACE_VALUE_TYPE_COPY_STRING; *value = type_value.as_uint; } // These AddTraceEvent template functions are defined here instead of in the // macro, because the arg_values could be temporary objects, such as // std::string. In order to store pointers to the internal c_str and pass // through to the tracing API, the arg_values must live throughout // these procedures. static inline void AddTraceEvent(char phase, const unsigned char* category_enabled, const char* name, unsigned long long id, unsigned char flags) { TRACE_EVENT_API_ADD_TRACE_EVENT( phase, category_enabled, name, id, kZeroNumArgs, NULL, NULL, NULL, flags); } template static inline void AddTraceEvent(char phase, const unsigned char* category_enabled, const char* name, unsigned long long id, unsigned char flags, const char* arg1_name, const ARG1_TYPE& arg1_val) { const int num_args = 1; unsigned char arg_types[1]; unsigned long long arg_values[1]; SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]); TRACE_EVENT_API_ADD_TRACE_EVENT( phase, category_enabled, name, id, num_args, &arg1_name, arg_types, arg_values, flags); } template static inline void AddTraceEvent(char phase, const unsigned char* category_enabled, const char* name, unsigned long long id, unsigned char flags, const char* arg1_name, const ARG1_TYPE& arg1_val, const char* arg2_name, const ARG2_TYPE& arg2_val) { const int num_args = 2; const char* arg_names[2] = { arg1_name, arg2_name }; unsigned char arg_types[2]; unsigned long long arg_values[2]; SetTraceValue(arg1_val, &arg_types[0], &arg_values[0]); SetTraceValue(arg2_val, &arg_types[1], &arg_values[1]); TRACE_EVENT_API_ADD_TRACE_EVENT( phase, category_enabled, name, id, num_args, arg_names, arg_types, arg_values, flags); } // Used by TRACE_EVENTx macro. Do not use directly. class TraceEndOnScopeClose { public: // Note: members of data_ intentionally left uninitialized. See Initialize. TraceEndOnScopeClose() : p_data_(NULL) {} ~TraceEndOnScopeClose() { if (p_data_) AddEventIfEnabled(); } void Initialize(const unsigned char* category_enabled, const char* name) { data_.category_enabled = category_enabled; data_.name = name; p_data_ = &data_; } private: // Add the end event if the category is still enabled. void AddEventIfEnabled() { // Only called when p_data_ is non-null. if (*p_data_->category_enabled) { TRACE_EVENT_API_ADD_TRACE_EVENT( TRACE_EVENT_PHASE_END, p_data_->category_enabled, p_data_->name, kNoEventId, kZeroNumArgs, NULL, NULL, NULL, TRACE_EVENT_FLAG_NONE); } } // This Data struct workaround is to avoid initializing all the members // in Data during construction of this object, since this object is always // constructed, even when tracing is disabled. If the members of Data were // members of this class instead, compiler warnings occur about potential // uninitialized accesses. struct Data { const unsigned char* category_enabled; const char* name; }; Data* p_data_; Data data_; }; } // namespace trace_event_internal } // namespace webrtc #endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_EVENT_H_