v8/src/counters.cc

// Copyright 2012 the V8 project authors. All rights reserved.
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#include "v8.h"

#include "counters.h"
#include "isolate.h"
#include "platform.h"

namespace v8 {
namespace internal {

StatsTable::StatsTable()
    : lookup_function_(NULL),
      create_histogram_function_(NULL),
      add_histogram_sample_function_(NULL) {}


int* StatsCounter::FindLocationInStatsTable() const {
  return Isolate::Current()->stats_table()->FindLocation(name_);
}


void Histogram::AddSample(int sample) {
  if (Enabled()) {
    isolate()->stats_table()->AddHistogramSample(histogram_, sample);
  }
}

void* Histogram::CreateHistogram() const {
  return isolate()->stats_table()->
      CreateHistogram(name_, min_, max_, num_buckets_);
}


// Start the timer.
void HistogramTimer::Start() {
  if (Enabled()) {
    stop_time_ = 0;
    start_time_ = OS::Ticks();
  }
  if (FLAG_log_internal_timer_events) {
    LOG(isolate(), TimerEvent(Logger::START, name()));
  }
}


// Stop the timer and record the results.
void HistogramTimer::Stop() {
  if (Enabled()) {
    stop_time_ = OS::Ticks();
    // Compute the delta between start and stop, in milliseconds.
    int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
    AddSample(milliseconds);
  }
  if (FLAG_log_internal_timer_events) {
    LOG(isolate(), TimerEvent(Logger::END, name()));
  }
}

} }  // namespace v8::internal