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

src/compiler.cc

 // Copyright 2012 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 242 matching lines @@
 
 static bool AlwaysFullCompiler(Isolate* isolate) {
   return FLAG_always_full_compiler || IsDebuggerActive(isolate);
 }
 
 
 void OptimizingCompiler::RecordOptimizationStats() {
   Handle<JSFunction> function = info()->closure();
   int opt_count = function->shared()->opt_count();
   function->shared()->set_opt_count(opt_count + 1);
-  double ms_creategraph =
-      static_cast<double>(time_taken_to_create_graph_) / 1000;
-  double ms_optimize = static_cast<double>(time_taken_to_optimize_) / 1000;
-  double ms_codegen = static_cast<double>(time_taken_to_codegen_) / 1000;
+  double ms_creategraph = time_taken_to_create_graph_.InMillisecondsF();
+  double ms_optimize = time_taken_to_optimize_.InMillisecondsF();
+  double ms_codegen = time_taken_to_codegen_.InMillisecondsF();
   if (FLAG_trace_opt) {
     PrintF("[optimizing ");
     function->ShortPrint();
     PrintF(" - took %0.3f, %0.3f, %0.3f ms]\n", ms_creategraph, ms_optimize,
            ms_codegen);
   }
   if (FLAG_trace_opt_stats) {
     static double compilation_time = 0.0;
     static int compiled_functions = 0;
     static int code_size = 0;
@@ skipping 89 matching lines @@
     info()->AbortOptimization();
     return SetLastStatus(BAILED_OUT);
   }
 
   // Recompile the unoptimized version of the code if the current version
   // doesn't have deoptimization support. Alternatively, we may decide to
   // run the full code generator to get a baseline for the compile-time
   // performance of the hydrogen-based compiler.
   bool should_recompile = !info()->shared_info()->has_deoptimization_support();
   if (should_recompile || FLAG_hydrogen_stats) {
-    int64_t start_ticks = 0;
+    ElapsedTimer timer;
     if (FLAG_hydrogen_stats) {
-      start_ticks = OS::Ticks();
+      timer.Start();
     }
     CompilationInfoWithZone unoptimized(info()->shared_info());
     // Note that we use the same AST that we will use for generating the
     // optimized code.
     unoptimized.SetFunction(info()->function());
     unoptimized.SetScope(info()->scope());
     unoptimized.SetContext(info()->context());
     if (should_recompile) unoptimized.EnableDeoptimizationSupport();
     bool succeeded = FullCodeGenerator::MakeCode(&unoptimized);
     if (should_recompile) {
       if (!succeeded) return SetLastStatus(FAILED);
       Handle<SharedFunctionInfo> shared = info()->shared_info();
       shared->EnableDeoptimizationSupport(*unoptimized.code());
       // The existing unoptimized code was replaced with the new one.
       Compiler::RecordFunctionCompilation(
           Logger::LAZY_COMPILE_TAG, &unoptimized, shared);
     }
     if (FLAG_hydrogen_stats) {
-      int64_t ticks = OS::Ticks() - start_ticks;
-      isolate()->GetHStatistics()->IncrementFullCodeGen(ticks);
+      isolate()->GetHStatistics()->IncrementFullCodeGen(timer.Elapsed());
     }
   }
 
   // Check that the unoptimized, shared code is ready for
   // optimizations.  When using the always_opt flag we disregard the
   // optimizable marker in the code object and optimize anyway. This
   // is safe as long as the unoptimized code has deoptimization
   // support.
   ASSERT(FLAG_always_opt || info()->shared_info()->code()->optimizable());
   ASSERT(info()->shared_info()->has_deoptimization_support());
@@ skipping 828 matching lines @@
                  Handle<Script>(info->script()),
                  Handle<Code>(info->code()),
                  info));
 }
 
 
 CompilationPhase::CompilationPhase(const char* name, CompilationInfo* info)
     : name_(name), info_(info), zone_(info->isolate()) {
   if (FLAG_hydrogen_stats) {
     info_zone_start_allocation_size_ = info->zone()->allocation_size();
-    start_ticks_ = OS::Ticks();
+    timer_.Start();
   }
 }
 
 
 CompilationPhase::~CompilationPhase() {
   if (FLAG_hydrogen_stats) {
     unsigned size = zone()->allocation_size();
     size += info_->zone()->allocation_size() - info_zone_start_allocation_size_;
-    int64_t ticks = OS::Ticks() - start_ticks_;
-    isolate()->GetHStatistics()->SaveTiming(name_, ticks, size);
+    isolate()->GetHStatistics()->SaveTiming(name_, timer_.Elapsed(), size);
   }
 }
 
 
 bool CompilationPhase::ShouldProduceTraceOutput() const {
   // Trace if the appropriate trace flag is set and the phase name's first
   // character is in the FLAG_trace_phase command line parameter.
   AllowHandleDereference allow_deref;
   bool tracing_on = info()->IsStub()
       ? FLAG_trace_hydrogen_stubs
       : (FLAG_trace_hydrogen &&
          info()->closure()->PassesFilter(FLAG_trace_hydrogen_filter));
   return (tracing_on &&
       OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal