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kc3-lang/angle/src/third_party/trace_event
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Author :
Etienne Bergeron
Date : 2020-06-09 10:52:57
Hash : f8fd9cfb
Message : Fix racy GetCategory with trace_event See racy trace_event: http://crbug.com/1091723 The trace event macros were racy because of this code: INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(...) The macro is using a static variable which is not thread-safe. The design of tracing was racy (by design) and rely on the fact that addTraceEvent(...) is threadsafe internally via TraceLog::lock_ This CL is replacing the static variable with a scope (C++11) pattern. The static variable is guaranted (C++) to be atomic and it is implemented efficiently. see: ยง6.7 [stmt.dcl] p4 " If control enters the declaration concurrently while the variable is being initialized, the concurrent execution shall wait for completion of the initialization. " Bug to track follow-up migration: http://anglebug.com/4702 Bug: chromium:1091259, chromium:1091723 Change-Id: If67b501e6e826ccf603eb2349c3f0aa6272c9a52 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2233410 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>
- trace_event.h
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// Copyright (c) 2013 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. // 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: // 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_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 aquiring a lock // and resolving the category. #ifndef COMMON_TRACE_EVENT_H_ #define COMMON_TRACE_EVENT_H_ #include <string> #include "common/event_tracer.h" // 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) WebCore::TraceEvent::TraceStringWithCopy(str) // 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(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(platform, category, name) #define TRACE_EVENT1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(platform, category, name, arg1_name, arg1_val) #define TRACE_EVENT2(category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_SCOPED(platform, category, name, 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(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_INSTANT, category, name, \ TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_INSTANT1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_INSTANT, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_INSTANT2(platform, category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_INSTANT, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_INSTANT0(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_INSTANT, category, name, \ TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_INSTANT1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_INSTANT, category, name, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_INSTANT2(platform, category, name, arg1_name, arg1_val, arg2_name, \ arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, 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(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_BEGIN, category, name, \ TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_BEGIN1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_BEGIN, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_BEGIN2(platform, category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_BEGIN, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_BEGIN0(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_BEGIN, category, name, \ TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_BEGIN1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_BEGIN, category, name, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_BEGIN2(platform, category, name, arg1_name, arg1_val, arg2_name, \ arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, 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(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_END, category, name, TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_END1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_END, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_END2(platform, category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_END, category, name, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, arg2_name, arg2_val) #define TRACE_EVENT_COPY_END0(platform, category, name) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_END, category, name, TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_END1(platform, category, name, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_END, category, name, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_END2(platform, category, name, arg1_name, arg1_val, arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, 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(platform, category, name, value) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_COUNTER, category, name, \ TRACE_EVENT_FLAG_NONE, "value", static_cast<int>(value)) #define TRACE_COPY_COUNTER1(platform, category, name, value) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_COUNTER, category, 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(platform, category, name, value1_name, value1_val, value2_name, value2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_COUNTER, category, name, \ TRACE_EVENT_FLAG_NONE, value1_name, static_cast<int>(value1_val), \ value2_name, static_cast<int>(value2_val)) #define TRACE_COPY_COUNTER2(platform, category, name, value1_name, value1_val, value2_name, \ value2_val) \ INTERNAL_TRACE_EVENT_ADD(platform, TRACE_EVENT_PHASE_COUNTER, category, name, \ TRACE_EVENT_FLAG_COPY, 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(platform, category, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_COUNTER, category, name, id, \ TRACE_EVENT_FLAG_NONE, "value", static_cast<int>(value)) #define TRACE_COPY_COUNTER_ID1(platform, category, name, id, value) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_COUNTER, category, 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(platform, category, name, id, value1_name, value1_val, value2_name, \ value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID( \ platform, TRACE_EVENT_PHASE_COUNTER, category, 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(platform, category, name, id, value1_name, value1_val, value2_name, \ value2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID( \ platform, TRACE_EVENT_PHASE_COUNTER, category, name, id, TRACE_EVENT_FLAG_COPY, \ value1_name, static_cast<int>(value1_val), value2_name, static_cast<int>(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_BEGIN macros. When the operation completes, call ASYNC_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_ASYNC_BEGIN0(platform, category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_BEGIN, category, name, id, \ TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_BEGIN1(platform, category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_BEGIN, category, name, id, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_BEGIN2(platform, category, name, id, arg1_name, arg1_val, arg2_name, \ arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, 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(platform, category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_BEGIN, category, name, id, \ TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_BEGIN1(platform, category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_BEGIN, category, name, id, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_BEGIN2(platform, category, name, id, arg1_name, arg1_val, \ arg2_name, arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, 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(platform, category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_STEP, category, name, id, \ TRACE_EVENT_FLAG_NONE, "step", step) #define TRACE_EVENT_ASYNC_STEP1(platform, category, name, id, step, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_STEP, category, name, id, \ TRACE_EVENT_FLAG_NONE, "step", step, arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_STEP0(platform, category, name, id, step) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_STEP, category, name, id, \ TRACE_EVENT_FLAG_COPY, "step", step) #define TRACE_EVENT_COPY_ASYNC_STEP1(platform, category, name, id, step, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, 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(platform, category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_END, category, name, id, \ TRACE_EVENT_FLAG_NONE) #define TRACE_EVENT_ASYNC_END1(platform, category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_END, category, name, id, \ TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val) #define TRACE_EVENT_ASYNC_END2(platform, category, name, id, arg1_name, arg1_val, arg2_name, \ arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, 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(platform, category, name, id) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_END, category, name, id, \ TRACE_EVENT_FLAG_COPY) #define TRACE_EVENT_COPY_ASYNC_END1(platform, category, name, id, arg1_name, arg1_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_END, category, name, id, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val) #define TRACE_EVENT_COPY_ASYNC_END2(platform, category, name, id, arg1_name, arg1_val, arg2_name, \ arg2_val) \ INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, TRACE_EVENT_PHASE_ASYNC_END, category, name, id, \ TRACE_EVENT_FLAG_COPY, arg1_name, arg1_val, arg2_name, \ arg2_val) // Creates a scope of a sampling state with the given category and name (both must // be constant strings). These states are intended for a sampling profiler. // Implementation note: we store category and name together because we don't // want the inconsistency/expense of storing two pointers. // |thread_bucket| is [0..2] and is used to statically isolate samples in one // thread from others. // // { // The sampling state is set within this scope. // TRACE_EVENT_SAMPLING_STATE_SCOPE_FOR_BUCKET(0, "category", "name"); // ...; // } #define TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \ TraceEvent::SamplingStateScope<bucket_number> traceEventSamplingScope(category "\0" name); // Returns a current sampling state of the given bucket. // The format of the returned string is "category\0name". #define TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(bucket_number) \ TraceEvent::SamplingStateScope<bucket_number>::current() // Sets a current sampling state of the given bucket. // |category| and |name| have to be constant strings. #define TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(bucket_number, category, name) \ TraceEvent::SamplingStateScope<bucket_number>::set(category "\0" name) // Sets a current sampling state of the given bucket. // |categoryAndName| doesn't need to be a constant string. // The format of the string is "category\0name". #define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(bucket_number, categoryAndName) \ TraceEvent::SamplingStateScope<bucket_number>::set(categoryAndName) // Syntactic sugars for the sampling tracing in the main thread. #define TRACE_EVENT_SCOPED_SAMPLING_STATE(category, name) \ TRACE_EVENT_SCOPED_SAMPLING_STATE_FOR_BUCKET(0, category, name) #define TRACE_EVENT_GET_SAMPLING_STATE() TRACE_EVENT_GET_SAMPLING_STATE_FOR_BUCKET(0) #define TRACE_EVENT_SET_SAMPLING_STATE(category, name) \ TRACE_EVENT_SET_SAMPLING_STATE_FOR_BUCKET(0, category, name) #define TRACE_EVENT_SET_NONCONST_SAMPLING_STATE(categoryAndName) \ TRACE_EVENT_SET_NONCONST_SAMPLING_STATE_FOR_BUCKET(0, categoryAndName) //////////////////////////////////////////////////////////////////////////////// // 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 angle::GetTraceCategoryEnabledFlag // 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 angle::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 INTERNALTRACEEVENTUID(name_prefix) INTERNAL_TRACE_EVENT_UID2(name_prefix, __LINE__) // Implementation detail: internal macro to create static category. #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(platform, category) \ static const unsigned char *INTERNALTRACEEVENTUID(catstatic) = \ TRACE_EVENT_API_GET_CATEGORY_ENABLED(platform, category); // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD(platform, phase, category, name, flags, ...) \ do \ { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(platform, category); \ if (*INTERNALTRACEEVENTUID(catstatic)) \ { \ gl::TraceEvent::addTraceEvent(platform, phase, INTERNALTRACEEVENTUID(catstatic), name, \ gl::TraceEvent::noEventId, 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(platform, category, name, ...) \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(platform, category); \ gl::TraceEvent::TraceEndOnScopeClose INTERNALTRACEEVENTUID(profileScope); \ do \ { \ if (*INTERNALTRACEEVENTUID(catstatic)) \ { \ gl::TraceEvent::addTraceEvent( \ platform, TRACE_EVENT_PHASE_BEGIN, INTERNALTRACEEVENTUID(catstatic), name, \ gl::TraceEvent::noEventId, TRACE_EVENT_FLAG_NONE, ##__VA_ARGS__); \ INTERNALTRACEEVENTUID(profileScope) \ .initialize(platform, INTERNALTRACEEVENTUID(catstatic), name); \ } \ } while (0) // Implementation detail: internal macro to create static category and add // event if the category is enabled. #define INTERNAL_TRACE_EVENT_ADD_WITH_ID(platform, phase, category, name, id, flags, ...) \ do \ { \ INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(platform, category); \ if (*INTERNALTRACEEVENTUID(catstatic)) \ { \ unsigned char traceEventFlags = flags | TRACE_EVENT_FLAG_HAS_ID; \ gl::TraceEvent::TraceID traceEventTraceID(id, &traceEventFlags); \ gl::TraceEvent::addTraceEvent(platform, phase, INTERNALTRACEEVENTUID(catstatic), name, \ traceEventTraceID.data(), traceEventFlags, \ ##__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_METADATA ('M') #define TRACE_EVENT_PHASE_COUNTER ('C') #define TRACE_EVENT_PHASE_SAMPLE ('P') // Flags for changing the behavior of TRACE_EVENT_API_ADD_TRACE_EVENT. #define TRACE_EVENT_FLAG_NONE (static_cast<unsigned char>(0)) #define TRACE_EVENT_FLAG_COPY (static_cast<unsigned char>(1 << 0)) #define TRACE_EVENT_FLAG_HAS_ID (static_cast<unsigned char>(1 << 1)) #define TRACE_EVENT_FLAG_MANGLE_ID (static_cast<unsigned char>(1 << 2)) // 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)) namespace gl { namespace TraceEvent { // Specify these values when the corresponding argument of addTraceEvent is not // used. const int zeroNumArgs = 0; const unsigned long long noEventId = 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: explicit TraceID(const void *id, unsigned char *flags) : m_data(static_cast<unsigned long long>(reinterpret_cast<uintptr_t>(id))) { *flags |= TRACE_EVENT_FLAG_MANGLE_ID; } explicit TraceID(unsigned long long id, unsigned char *flags) : m_data(id) { (void)flags; } explicit TraceID(unsigned long id, unsigned char *flags) : m_data(id) { (void)flags; } explicit TraceID(unsigned int id, unsigned char *flags) : m_data(id) { (void)flags; } explicit TraceID(unsigned short id, unsigned char *flags) : m_data(id) { (void)flags; } explicit TraceID(unsigned char id, unsigned char *flags) : m_data(id) { (void)flags; } explicit TraceID(long long id, unsigned char *flags) : m_data(static_cast<unsigned long long>(id)) { (void)flags; } explicit TraceID(long id, unsigned char *flags) : m_data(static_cast<unsigned long long>(id)) { (void)flags; } explicit TraceID(int id, unsigned char *flags) : m_data(static_cast<unsigned long long>(id)) { (void)flags; } explicit TraceID(short id, unsigned char *flags) : m_data(static_cast<unsigned long long>(id)) { (void)flags; } explicit TraceID(signed char id, unsigned char *flags) : m_data(static_cast<unsigned long long>(id)) { (void)flags; } unsigned long long data() const { return m_data; } private: unsigned long long m_data; }; // Simple union to store various types as unsigned long long. union TraceValueUnion { bool m_bool; unsigned long long m_uint; long long m_int; double m_double; const void *m_pointer; const char *m_string; }; // Simple container for const char* that should be copied instead of retained. class TraceStringWithCopy { public: explicit TraceStringWithCopy(const char *str) : m_str(str) {} operator const char *() const { return m_str; } private: const char *m_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 typeValue; \ typeValue.union_member = arg; \ *type = value_type_id; \ *value = typeValue.m_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<unsigned long long>(arg); \ } INTERNAL_DECLARE_SET_TRACE_VALUE_INT(unsigned long 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(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, m_bool, TRACE_VALUE_TYPE_BOOL) INTERNAL_DECLARE_SET_TRACE_VALUE(double, m_double, TRACE_VALUE_TYPE_DOUBLE) INTERNAL_DECLARE_SET_TRACE_VALUE(const void *, m_pointer, TRACE_VALUE_TYPE_POINTER) INTERNAL_DECLARE_SET_TRACE_VALUE(const char *, m_string, TRACE_VALUE_TYPE_STRING) INTERNAL_DECLARE_SET_TRACE_VALUE(const TraceStringWithCopy &, m_string, TRACE_VALUE_TYPE_COPY_STRING) #undef INTERNAL_DECLARE_SET_TRACE_VALUE #undef INTERNAL_DECLARE_SET_TRACE_VALUE_INT static inline void setTraceValue(const std::string &arg, unsigned char *type, unsigned long long *value) { TraceValueUnion typeValue; typeValue.m_string = arg.data(); *type = TRACE_VALUE_TYPE_COPY_STRING; *value = typeValue.m_uint; } // These addTraceEvent template functions are defined here instead of in the // macro, because the arg values could be temporary string objects. 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 angle::TraceEventHandle addTraceEvent(angle::PlatformMethods *platform, char phase, const unsigned char *categoryEnabled, const char *name, unsigned long long id, unsigned char flags) { return TRACE_EVENT_API_ADD_TRACE_EVENT(platform, phase, categoryEnabled, name, id, zeroNumArgs, 0, 0, 0, flags); } template <class ARG1_TYPE> static inline angle::TraceEventHandle addTraceEvent(angle::PlatformMethods *platform, char phase, const unsigned char *categoryEnabled, const char *name, unsigned long long id, unsigned char flags, const char *arg1Name, const ARG1_TYPE &arg1Val) { const int numArgs = 1; unsigned char argTypes[1]; unsigned long long argValues[1]; setTraceValue(arg1Val, &argTypes[0], &argValues[0]); return TRACE_EVENT_API_ADD_TRACE_EVENT(platform, phase, categoryEnabled, name, id, numArgs, &arg1Name, argTypes, argValues, flags); } template <class ARG1_TYPE, class ARG2_TYPE> static inline angle::TraceEventHandle addTraceEvent(angle::PlatformMethods *platform, char phase, const unsigned char *categoryEnabled, const char *name, unsigned long long id, unsigned char flags, const char *arg1Name, const ARG1_TYPE &arg1Val, const char *arg2Name, const ARG2_TYPE &arg2Val) { const int numArgs = 2; const char *argNames[2] = {arg1Name, arg2Name}; unsigned char argTypes[2]; unsigned long long argValues[2]; setTraceValue(arg1Val, &argTypes[0], &argValues[0]); setTraceValue(arg2Val, &argTypes[1], &argValues[1]); return TRACE_EVENT_API_ADD_TRACE_EVENT(platform, phase, categoryEnabled, name, id, numArgs, argNames, argTypes, argValues, flags); } // Used by TRACE_EVENTx macro. Do not use directly. class TraceEndOnScopeClose { public: // Note: members of m_data intentionally left uninitialized. See initialize. TraceEndOnScopeClose() : m_pdata(0) {} ~TraceEndOnScopeClose() { if (m_pdata) addEventIfEnabled(); } void initialize(angle::PlatformMethods *platform, const unsigned char *categoryEnabled, const char *name) { m_data.platform = platform; m_data.categoryEnabled = categoryEnabled; m_data.name = name; m_pdata = &m_data; } private: // Add the end event if the category is still enabled. void addEventIfEnabled() { // Only called when m_pdata is non-null. if (*m_pdata->categoryEnabled) { TRACE_EVENT_API_ADD_TRACE_EVENT(m_pdata->platform, TRACE_EVENT_PHASE_END, m_pdata->categoryEnabled, m_pdata->name, noEventId, zeroNumArgs, 0, 0, 0, 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 { angle::PlatformMethods *platform; const unsigned char *categoryEnabled; const char *name; }; Data *m_pdata; Data m_data; }; } // namespace TraceEvent } // namespace gl #endif