[Tracing] Embed V8 runtime call stats into tracing.

src/arguments.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARGUMENTS_H_
 #define V8_ARGUMENTS_H_
 
 #include "src/allocation.h"
 #include "src/objects-inl.h"
 #include "src/tracing/trace-event.h"
@@ skipping 70 matching lines @@
 
 // TODO(cbruni): add global flag to check whether any tracing events have been
 // enabled.
 // TODO(cbruni): Convert the IsContext CHECK back to a DCHECK.
 #define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name)                             \
   static INLINE(Type __RT_impl_##Name(Arguments args, Isolate* isolate));     \
                                                                               \
   V8_NOINLINE static Type Stats_##Name(int args_length, Object** args_object, \
                                        Isolate* isolate) {                    \
     RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Name);            \
-    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                     \
-                 "V8.Runtime_" #Name);                                        \
     Arguments args(args_length, args_object);                                 \
+    TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(                            \
+        isolate, &tracing::TraceEventStatsTable::Name);                       \
     return __RT_impl_##Name(args, isolate);                                   \
   }                                                                           \
                                                                               \
   Type Name(int args_length, Object** args_object, Isolate* isolate) {        \
     CHECK(isolate->context() == nullptr || isolate->context()->IsContext());  \
     CLOBBER_DOUBLE_REGISTERS();                                               \
-    if (FLAG_runtime_call_stats) {                                            \
+    if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||       \
+                    FLAG_runtime_call_stats)) {                               \
       return Stats_##Name(args_length, args_object, isolate);                 \
     }                                                                         \
     Arguments args(args_length, args_object);                                 \
     return __RT_impl_##Name(args, isolate);                                   \
   }                                                                           \
                                                                               \
   static Type __RT_impl_##Name(Arguments args, Isolate* isolate)
 
 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name)
 #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name)
 #define RUNTIME_FUNCTION_RETURN_TRIPLE(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectTriple, Name)
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARGUMENTS_H_