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      1 // Copyright 2007-2008 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 // Start the timer.
     49 void StatsCounterTimer::Start() {
     50   if (!counter_.Enabled())
     51     return;
     52   stop_time_ = 0;
     53   start_time_ = OS::Ticks();
     54 }
     55 
     56 // Stop the timer and record the results.
     57 void StatsCounterTimer::Stop() {
     58   if (!counter_.Enabled())
     59     return;
     60   stop_time_ = OS::Ticks();
     61 
     62   // Compute the delta between start and stop, in milliseconds.
     63   int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
     64   counter_.Increment(milliseconds);
     65 }
     66 
     67 // Start the timer.
     68 void HistogramTimer::Start() {
     69   if (GetHistogram() != NULL) {
     70     stop_time_ = 0;
     71     start_time_ = OS::Ticks();
     72   }
     73 }
     74 
     75 // Stop the timer and record the results.
     76 void HistogramTimer::Stop() {
     77   if (histogram_ != NULL) {
     78     stop_time_ = OS::Ticks();
     79 
     80     // Compute the delta between start and stop, in milliseconds.
     81     int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
     82     Isolate::Current()->stats_table()->
     83         AddHistogramSample(histogram_, milliseconds);
     84   }
     85 }
     86 
     87 
     88 void* HistogramTimer::CreateHistogram() const {
     89   return Isolate::Current()->stats_table()->
     90       CreateHistogram(name_, 0, 10000, 50);
     91 }
     92 
     93 } }  // namespace v8::internal
     94