Trace events corresponding to GCTracer scopes.

src/heap/gc-tracer.cc

 // Copyright 2014 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.
 
 #include "src/heap/gc-tracer.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 
@@ skipping 26 matching lines @@
 GCTracer::Scope::~Scope() {
   DCHECK(scope_ < NUMBER_OF_SCOPES);  // scope_ is unsigned.
   tracer_->current_.scopes[scope_] +=
       tracer_->heap_->MonotonicallyIncreasingTimeInMs() - start_time_;
   // TODO(cbruni): remove once we fully moved to a trace-based system.
   if (FLAG_runtime_call_stats) {
     tracer_->heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
   }
 }
 
+const char* GCTracer::Scope::Name(ScopeId id) {
+#define CASE(scope)  \
+  case Scope::scope: \
+    return "V8.GC_" #scope;
+  switch (id) {
+    TRACER_SCOPES(CASE)
+    case Scope::NUMBER_OF_SCOPES:
+      break;
+  }
+#undef CASE
+  return "(unknown)";
+}
 
 GCTracer::Event::Event(Type type, const char* gc_reason,
                        const char* collector_reason)
     : type(type),
       gc_reason(gc_reason),
       collector_reason(collector_reason),
       start_time(0.0),
       end_time(0.0),
       reduce_memory(false),
       start_object_size(0),
@@ skipping 731 matching lines @@
   return sum / recorded_survival_ratios_.Count();
 }
 
 bool GCTracer::SurvivalEventsRecorded() const {
   return recorded_survival_ratios_.Count() > 0;
 }
 
 void GCTracer::ResetSurvivalEvents() { recorded_survival_ratios_.Reset(); }
 }  // namespace internal
 }  // namespace v8