Integrate Chrome tracing with V8 (WIP)

src/counters.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/base/platform/platform.h"
 #include "src/counters.h"
 #include "src/isolate.h"
 #include "src/log-inl.h"
@@ skipping 22 matching lines @@
   return isolate()->stats_table()->
       CreateHistogram(name_, min_, max_, num_buckets_);
 }
 
 
 // Start the timer.
 void HistogramTimer::Start() {
   if (Enabled()) {
     timer_.Start();
   }
-  Logger::CallEventLogger(isolate(), name(), Logger::START, true);
+  Logger::CallEventLogger(isolate(), name(), Logger::START, overhead());
 }
 
 
 // Stop the timer and record the results.
 void HistogramTimer::Stop() {
   if (Enabled()) {
     // Compute the delta between start and stop, in milliseconds.
     AddSample(static_cast<int>(timer_.Elapsed().InMilliseconds()));
     timer_.Stop();
   }
-  Logger::CallEventLogger(isolate(), name(), Logger::END, true);
+  Logger::CallEventLogger(isolate(), name(), Logger::END, overhead());
 }
 
 
 Counters::Counters(Isolate* isolate) {
 #define HR(name, caption, min, max, num_buckets) \
   name##_ = Histogram(#caption, min, max, num_buckets, isolate);
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
-#define HT(name, caption) \
-    name##_ = HistogramTimer(#caption, 0, 10000, 50, isolate);
+#define HT(name, caption, overhead) \
+  name##_ = HistogramTimer(#caption, 0, 10000, 50, isolate, Logger::overhead);
     HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define HP(name, caption) \
     name##_ = Histogram(#caption, 0, 101, 100, isolate);
     HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
 #define HM(name, caption) \
     name##_ = Histogram(#caption, 1000, 500000, 50, isolate);
@@ skipping 69 matching lines @@
   CODE_AGE_LIST_COMPLETE(SC)
 #undef SC
 }
 
 
 void Counters::ResetHistograms() {
 #define HR(name, caption, min, max, num_buckets) name##_.Reset();
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
-#define HT(name, caption) name##_.Reset();
+#define HT(name, caption, overhead) name##_.Reset();
     HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define HP(name, caption) name##_.Reset();
     HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
 #define HM(name, caption) name##_.Reset();
     HISTOGRAM_MEMORY_LIST(HM)
 #undef HM
 }
 
 } }  // namespace v8::internal