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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "v8.h"
     29 
     30 #include "counters.h"
     31 #include "isolate.h"
     32 #include "platform.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 StatsTable::StatsTable()
     38     : lookup_function_(NULL),
     39       create_histogram_function_(NULL),
     40       add_histogram_sample_function_(NULL) {}
     41 
     42 
     43 int* StatsCounter::FindLocationInStatsTable() const {
     44   return Isolate::Current()->stats_table()->FindLocation(name_);
     45 }
     46 
     47 
     48 void Histogram::AddSample(int sample) {
     49   if (Enabled()) {
     50     isolate()->stats_table()->AddHistogramSample(histogram_, sample);
     51   }
     52 }
     53 
     54 void* Histogram::CreateHistogram() const {
     55   return isolate()->stats_table()->
     56       CreateHistogram(name_, min_, max_, num_buckets_);
     57 }
     58 
     59 
     60 // Start the timer.
     61 void HistogramTimer::Start() {
     62   if (Enabled()) {
     63     stop_time_ = 0;
     64     start_time_ = OS::Ticks();
     65   }
     66   if (FLAG_log_internal_timer_events) {
     67     LOG(isolate(), TimerEvent(Logger::START, name()));
     68   }
     69 }
     70 
     71 
     72 // Stop the timer and record the results.
     73 void HistogramTimer::Stop() {
     74   if (Enabled()) {
     75     stop_time_ = OS::Ticks();
     76     // Compute the delta between start and stop, in milliseconds.
     77     int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
     78     AddSample(milliseconds);
     79   }
     80   if (FLAG_log_internal_timer_events) {
     81     LOG(isolate(), TimerEvent(Logger::END, name()));
     82   }
     83 }
     84 
     85 } }  // namespace v8::internal
     86