Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / src / core / lib / debug / trace.h

diff --git a/legacy-libs/grpc/deps/grpc/src/core/lib/debug/trace.h b/legacy-libs/grpc/deps/grpc/src/core/lib/debug/trace.h
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+/*
+ *
+ * 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>
+
+#include "src/core/lib/gprpp/global_config.h"
+
+GPR_GLOBAL_CONFIG_DECLARE_STRING(grpc_trace);
+
+// TODO(veblush): Remove this deprecated function once codes depending on this
+// function are updated in the internal repo.
+void grpc_tracer_init(const char* env_var_name);
+
+void grpc_tracer_init();
+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);
+  // TraceFlag needs to be trivially destructible since 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.
+//
+// Prefer GRPC_TRACE_FLAG_ENABLED() macro instead of using enabled() directly.
+#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
+};
+
+#define GRPC_TRACE_FLAG_ENABLED(f) GPR_UNLIKELY((f).enabled())
+
+#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 */