| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * 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 GRPC_CORE_LIB_DEBUG_TRACE_H |
| #define GRPC_CORE_LIB_DEBUG_TRACE_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <grpc/support/atm.h> |
| #include <stdbool.h> |
| |
| void grpc_tracer_init(const char* env_var_name); |
| void grpc_tracer_shutdown(void); |
| |
| #if defined(__has_feature) |
| #if __has_feature(thread_sanitizer) |
| #define GRPC_THREADSAFE_TRACER |
| #endif |
| #endif |
| |
| namespace grpc_core { |
| |
| class TraceFlag; |
| class TraceFlagList { |
| public: |
| static bool Set(const char* name, bool enabled); |
| static void Add(TraceFlag* flag); |
| |
| private: |
| static void LogAllTracers(); |
| static TraceFlag* root_tracer_; |
| }; |
| |
| namespace testing { |
| void grpc_tracer_enable_flag(grpc_core::TraceFlag* flag); |
| } |
| |
| class TraceFlag { |
| public: |
| TraceFlag(bool default_enabled, const char* name); |
| // This needs to be trivially destructible as it is used as global variable. |
| ~TraceFlag() = default; |
| |
| const char* name() const { return name_; } |
| |
| // Use the symbol GRPC_USE_TRACERS to determine if tracers will be enabled in |
| // opt builds (tracers are always on in dbg builds). The default in OSS is for |
| // tracers to be on since we support binary distributions of gRPC for the |
| // wrapped language (wr don't want to force recompilation to get tracing). |
| // Internally, however, for performance reasons, we compile them out by |
| // default, since internal build systems make recompiling trivial. |
| #define GRPC_USE_TRACERS // tracers on by default in OSS |
| #if defined(GRPC_USE_TRACERS) || !defined(NDEBUG) |
| bool enabled() { |
| #ifdef GRPC_THREADSAFE_TRACER |
| return gpr_atm_no_barrier_load(&value_) != 0; |
| #else |
| return value_; |
| #endif // GRPC_THREADSAFE_TRACER |
| } |
| #else |
| bool enabled() { return false; } |
| #endif /* defined(GRPC_USE_TRACERS) || !defined(NDEBUG) */ |
| |
| private: |
| friend void grpc_core::testing::grpc_tracer_enable_flag(TraceFlag* flag); |
| friend class TraceFlagList; |
| |
| void set_enabled(bool enabled) { |
| #ifdef GRPC_THREADSAFE_TRACER |
| gpr_atm_no_barrier_store(&value_, enabled); |
| #else |
| value_ = enabled; |
| #endif |
| } |
| |
| TraceFlag* next_tracer_; |
| const char* const name_; |
| #ifdef GRPC_THREADSAFE_TRACER |
| gpr_atm value_; |
| #else |
| bool value_; |
| #endif |
| }; |
| |
| #ifndef NDEBUG |
| typedef TraceFlag DebugOnlyTraceFlag; |
| #else |
| class DebugOnlyTraceFlag { |
| public: |
| constexpr DebugOnlyTraceFlag(bool default_enabled, const char* name) {} |
| constexpr bool enabled() const { return false; } |
| constexpr const char* name() const { return "DebugOnlyTraceFlag"; } |
| |
| private: |
| void set_enabled(bool enabled) {} |
| }; |
| #endif |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_CORE_LIB_DEBUG_TRACE_H */ |