Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class.

src/hydrogen.cc

 // Copyright 2013 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 9761 matching lines @@
 
 
 void HStatistics::Initialize(CompilationInfo* info) {
   if (info->shared_info().is_null()) return;
   source_size_ += info->shared_info()->SourceSize();
 }
 
 
 void HStatistics::Print() {
   PrintF("Timing results:\n");
-  int64_t sum = 0;
-  for (int i = 0; i < timing_.length(); ++i) {
-    sum += timing_[i];
+  TimeDelta sum;
+  for (int i = 0; i < times_.length(); ++i) {
+    sum += times_[i];
   }
 
   for (int i = 0; i < names_.length(); ++i) {
     PrintF("%32s", names_[i]);
-    double ms = static_cast<double>(timing_[i]) / 1000;
-    double percent = static_cast<double>(timing_[i]) * 100 / sum;
+    double ms = times_[i].InMillisecondsF();
+    double percent = times_[i].PercentOf(sum);
     PrintF(" %8.3f ms / %4.1f %% ", ms, percent);
 
     unsigned size = sizes_[i];
     double size_percent = static_cast<double>(size) * 100 / total_size_;
     PrintF(" %9u bytes / %4.1f %%\n", size, size_percent);
   }
 
   PrintF("----------------------------------------"
          "---------------------------------------\n");
-  int64_t total = create_graph_ + optimize_graph_ + generate_code_;
+  TimeDelta total = create_graph_ + optimize_graph_ + generate_code_;
   PrintF("%32s %8.3f ms / %4.1f %% \n",
          "Create graph",
-         static_cast<double>(create_graph_) / 1000,
-         static_cast<double>(create_graph_) * 100 / total);
+         create_graph_.InMillisecondsF(),
+         create_graph_.PercentOf(total));
   PrintF("%32s %8.3f ms / %4.1f %% \n",
          "Optimize graph",
-         static_cast<double>(optimize_graph_) / 1000,
-         static_cast<double>(optimize_graph_) * 100 / total);
+         optimize_graph_.InMillisecondsF(),
+         optimize_graph_.PercentOf(total));
   PrintF("%32s %8.3f ms / %4.1f %% \n",
          "Generate and install code",
-         static_cast<double>(generate_code_) / 1000,
-         static_cast<double>(generate_code_) * 100 / total);
+         generate_code_.InMillisecondsF(),
+         generate_code_.PercentOf(total));
   PrintF("----------------------------------------"
          "---------------------------------------\n");
   PrintF("%32s %8.3f ms (%.1f times slower than full code gen)\n",
          "Total",
-         static_cast<double>(total) / 1000,
-         static_cast<double>(total) / full_code_gen_);
+         total.InMillisecondsF(),
+         total.TimesOf(full_code_gen_));
 
   double source_size_in_kb = static_cast<double>(source_size_) / 1024;
   double normalized_time =  source_size_in_kb > 0
-      ? (static_cast<double>(total) / 1000) / source_size_in_kb
+      ? total.InMillisecondsF() / source_size_in_kb
       : 0;
   double normalized_size_in_kb = source_size_in_kb > 0
       ? total_size_ / 1024 / source_size_in_kb
       : 0;
   PrintF("%32s %8.3f ms           %7.3f kB allocated\n",
          "Average per kB source",
          normalized_time, normalized_size_in_kb);
 }
 
 
-void HStatistics::SaveTiming(const char* name, int64_t ticks, unsigned size) {
+void HStatistics::SaveTiming(const char* name, TimeDelta time, unsigned size) {
   total_size_ += size;
   for (int i = 0; i < names_.length(); ++i) {
     if (strcmp(names_[i], name) == 0) {
-      timing_[i] += ticks;
+      times_[i] += time;
       sizes_[i] += size;
       return;
     }
   }
   names_.Add(name);
-  timing_.Add(ticks);
+  times_.Add(time);
   sizes_.Add(size);
 }
 
 
 HPhase::~HPhase() {
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal