- Added ability to call histograms from within v8...

src/counters.cc

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #include "counters.h"
 #include "platform.h"
 
 namespace v8 { namespace internal {
 
 CounterLookupCallback StatsTable::lookup_function_ = NULL;
+CreateHistogramCallback StatsTable::create_histogram_function_ = NULL;
+AddHistogramSampleCallback StatsTable::add_histogram_sample_function_ = NULL;
 
 // Start the timer.
 void StatsCounterTimer::Start() {
   if (!counter_.Enabled())
     return;
   stop_time_ = 0;
   start_time_ = OS::Ticks();
 }
 
 // Stop the timer and record the results.
 void StatsCounterTimer::Stop() {
   if (!counter_.Enabled())
     return;
   stop_time_ = OS::Ticks();
 
   // Compute the delta between start and stop, in milliseconds.
   int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
   counter_.Increment(milliseconds);
 }
 
+// Start the timer.
+void HistogramTimer::Start() {
+  if (GetHistogram() != NULL) {
+    stop_time_ = 0;
+    start_time_ = OS::Ticks();
+  }
+}
+
+// Stop the timer and record the results.
+void HistogramTimer::Stop() {
+  if (histogram_ != NULL) {
+    stop_time_ = OS::Ticks();
+
+    // Compute the delta between start and stop, in milliseconds.
+    int milliseconds = static_cast<int>(stop_time_ - start_time_) / 1000;
+    StatsTable::AddHistogramSample(histogram_, milliseconds);
+  }
+}
+
 } }  // namespace v8::internal