Add histogram timers for (de-)serialization during compilation.

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1033 matching lines @@
 
   CompilationCache* compilation_cache = isolate->compilation_cache();
 
   // Do a lookup in the compilation cache but not for extensions.
   MaybeHandle<SharedFunctionInfo> maybe_result;
   Handle<SharedFunctionInfo> result;
   if (extension == NULL) {
     if (FLAG_serialize_toplevel &&
         compile_options == ScriptCompiler::kConsumeCodeCache &&
         !isolate->debug()->is_loaded()) {
+      HistogramTimerScope timer(isolate->counters()->compile_deserialize());
       return CodeSerializer::Deserialize(isolate, *cached_data, source);
     } else {
       maybe_result = compilation_cache->LookupScript(
           source, script_name, line_offset, column_offset,
           is_shared_cross_origin, context);
     }
   }
 
   base::ElapsedTimer timer;
   if (FLAG_profile_deserialization && FLAG_serialize_toplevel &&
@@ skipping 26 matching lines @@
         compile_options == ScriptCompiler::kProduceCodeCache) {
       info.PrepareForSerializing();
     }
     if (FLAG_use_strict) info.SetStrictMode(STRICT);
 
     result = CompileToplevel(&info);
     if (extension == NULL && !result.is_null() && !result->dont_cache()) {
       compilation_cache->PutScript(source, context, result);
       if (FLAG_serialize_toplevel &&
           compile_options == ScriptCompiler::kProduceCodeCache) {
+        HistogramTimerScope histogram_timer(
+            isolate->counters()->compile_serialize());
         *cached_data = CodeSerializer::Serialize(isolate, result, source);
         if (FLAG_profile_deserialization) {
           PrintF("[Compiling and serializing %d bytes took %0.3f ms]\n",
                  (*cached_data)->length(), timer.Elapsed().InMillisecondsF());
         }
       }
     }
 
     if (result.is_null()) isolate->ReportPendingMessages();
   } else if (result->ic_age() != isolate->heap()->global_ic_age()) {
@@ skipping 315 matching lines @@
   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 &&
       base::OS::StrChr(const_cast<char*>(FLAG_trace_phase), name_[0]) != NULL);
 }
 
 } }  // namespace v8::internal