| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_TRACING_INTERNAL_TRACK_EVENT_MACROS_H_ |
| #define INCLUDE_PERFETTO_TRACING_INTERNAL_TRACK_EVENT_MACROS_H_ |
| |
| // This file contains underlying macros for the trace point track event |
| // implementation. Perfetto API users typically don't need to use anything here |
| // directly. |
| |
| #include "perfetto/base/compiler.h" |
| #include "perfetto/tracing/internal/track_event_data_source.h" |
| #include "perfetto/tracing/track_event_category_registry.h" |
| |
| // Ignore GCC warning about a missing argument for a variadic macro parameter. |
| #if defined(__GNUC__) || defined(__clang__) |
| #pragma GCC system_header |
| #endif |
| |
| // Defines data structures for backing a category registry. |
| // |
| // Each category has one enabled/disabled bit per possible data source instance. |
| // The bits are packed, i.e., each byte holds the state for instances. To |
| // improve cache locality, the bits for each instance are stored separately from |
| // the names of the categories: |
| // |
| // byte 0 byte 1 |
| // (inst0, inst1, ..., inst7), (inst0, inst1, ..., inst7) |
| // |
| #define PERFETTO_INTERNAL_DECLARE_CATEGORIES(...) \ |
| namespace internal { \ |
| constexpr ::perfetto::Category kCategories[] = {__VA_ARGS__}; \ |
| constexpr size_t kCategoryCount = \ |
| sizeof(kCategories) / sizeof(kCategories[0]); \ |
| /* The per-instance enable/disable state per category */ \ |
| PERFETTO_COMPONENT_EXPORT extern std::atomic<uint8_t> \ |
| g_category_state_storage[kCategoryCount]; \ |
| /* The category registry which mediates access to the above structures. */ \ |
| /* The registry is used for two purposes: */ \ |
| /**/ \ |
| /* 1) For looking up categories at build (constexpr) time. */ \ |
| /* 2) For declaring the per-namespace TrackEvent data source. */ \ |
| /**/ \ |
| /* Because usage #1 requires a constexpr type and usage #2 requires an */ \ |
| /* extern type (to avoid declaring a type based on a translation-unit */ \ |
| /* variable), we need two separate copies of the registry with different */ \ |
| /* storage specifiers. */ \ |
| /**/ \ |
| /* TODO(skyostil): Unify these using a C++17 inline constexpr variable. */ \ |
| constexpr ::perfetto::internal::TrackEventCategoryRegistry \ |
| kConstExprCategoryRegistry(kCategoryCount, \ |
| &kCategories[0], \ |
| &g_category_state_storage[0]); \ |
| PERFETTO_COMPONENT_EXPORT extern const ::perfetto::internal:: \ |
| TrackEventCategoryRegistry kCategoryRegistry; \ |
| static_assert(kConstExprCategoryRegistry.ValidateCategories(), \ |
| "Invalid category names found"); \ |
| } // namespace internal |
| |
| // In a .cc file, declares storage for each category's runtime state. |
| #define PERFETTO_INTERNAL_CATEGORY_STORAGE() \ |
| namespace internal { \ |
| PERFETTO_COMPONENT_EXPORT std::atomic<uint8_t> \ |
| g_category_state_storage[kCategoryCount]; \ |
| PERFETTO_COMPONENT_EXPORT const ::perfetto::internal:: \ |
| TrackEventCategoryRegistry kCategoryRegistry( \ |
| kCategoryCount, \ |
| &kCategories[0], \ |
| &g_category_state_storage[0]); \ |
| } // namespace internal |
| |
| // Defines the TrackEvent data source for the current track event namespace. |
| #define PERFETTO_INTERNAL_DECLARE_TRACK_EVENT_DATA_SOURCE() \ |
| struct PERFETTO_COMPONENT_EXPORT TrackEvent \ |
| : public ::perfetto::internal::TrackEventDataSource< \ |
| TrackEvent, &internal::kCategoryRegistry> {} |
| |
| // At compile time, turns a category name represented by a static string into an |
| // index into the current category registry. A build error will be generated if |
| // the category hasn't been registered or added to the list of allowed dynamic |
| // categories. See PERFETTO_DEFINE_CATEGORIES. |
| #define PERFETTO_GET_CATEGORY_INDEX(category) \ |
| ::PERFETTO_TRACK_EVENT_NAMESPACE::internal::kConstExprCategoryRegistry.Find( \ |
| category, \ |
| ::PERFETTO_TRACK_EVENT_NAMESPACE::internal::IsDynamicCategory(category)) |
| |
| // Generate a unique variable name with a given prefix. |
| #define PERFETTO_INTERNAL_CONCAT2(a, b) a##b |
| #define PERFETTO_INTERNAL_CONCAT(a, b) PERFETTO_INTERNAL_CONCAT2(a, b) |
| #define PERFETTO_UID(prefix) PERFETTO_INTERNAL_CONCAT(prefix, __LINE__) |
| |
| // Efficiently determines whether tracing is enabled for the given category, and |
| // if so, emits one trace event with the given arguments. |
| #define PERFETTO_INTERNAL_TRACK_EVENT(category, ...) \ |
| do { \ |
| namespace tns = ::PERFETTO_TRACK_EVENT_NAMESPACE; \ |
| /* Compute the category index outside the lambda to work around a */ \ |
| /* GCC 7 bug */ \ |
| static constexpr auto PERFETTO_UID( \ |
| kCatIndex_ADD_TO_PERFETTO_DEFINE_CATEGORIES_IF_FAILS_) = \ |
| PERFETTO_GET_CATEGORY_INDEX(category); \ |
| if (tns::internal::IsDynamicCategory(category)) { \ |
| tns::TrackEvent::CallIfEnabled( \ |
| [&](uint32_t instances) PERFETTO_NO_THREAD_SAFETY_ANALYSIS { \ |
| tns::TrackEvent::TraceForCategory(instances, category, \ |
| ##__VA_ARGS__); \ |
| }); \ |
| } else { \ |
| tns::TrackEvent::CallIfCategoryEnabled( \ |
| PERFETTO_UID(kCatIndex_ADD_TO_PERFETTO_DEFINE_CATEGORIES_IF_FAILS_), \ |
| [&](uint32_t instances) PERFETTO_NO_THREAD_SAFETY_ANALYSIS { \ |
| tns::TrackEvent::TraceForCategory( \ |
| instances, \ |
| PERFETTO_UID( \ |
| kCatIndex_ADD_TO_PERFETTO_DEFINE_CATEGORIES_IF_FAILS_), \ |
| ##__VA_ARGS__); \ |
| }); \ |
| } \ |
| } while (false) |
| |
| #define PERFETTO_INTERNAL_SCOPED_TRACK_EVENT(category, name, ...) \ |
| struct PERFETTO_UID(ScopedEvent) { \ |
| struct EventFinalizer { \ |
| /* The parameter is an implementation detail. It allows the */ \ |
| /* anonymous struct to use aggregate initialization to invoke the */ \ |
| /* lambda (which emits the BEGIN event and returns an integer) */ \ |
| /* with the proper reference capture for any */ \ |
| /* TrackEventArgumentFunction in |__VA_ARGS__|. This is required so */ \ |
| /* that the scoped event is exactly ONE line and can't escape the */ \ |
| /* scope if used in a single line if statement. */ \ |
| EventFinalizer(...) {} \ |
| ~EventFinalizer() { TRACE_EVENT_END(category); } \ |
| } finalizer; \ |
| } PERFETTO_UID(scoped_event) { \ |
| [&]() { \ |
| TRACE_EVENT_BEGIN(category, name, ##__VA_ARGS__); \ |
| return 0; \ |
| }() \ |
| } |
| |
| #define PERFETTO_INTERNAL_CATEGORY_ENABLED(category) \ |
| (::PERFETTO_TRACK_EVENT_NAMESPACE::internal::IsDynamicCategory(category) \ |
| ? ::PERFETTO_TRACK_EVENT_NAMESPACE::TrackEvent:: \ |
| IsDynamicCategoryEnabled(::perfetto::DynamicCategory(category)) \ |
| : ::PERFETTO_TRACK_EVENT_NAMESPACE::TrackEvent::IsCategoryEnabled( \ |
| PERFETTO_GET_CATEGORY_INDEX(category))) |
| |
| #endif // INCLUDE_PERFETTO_TRACING_INTERNAL_TRACK_EVENT_MACROS_H_ |