Cache optimized code on shared function info.

src/runtime-profiler.cc

 // Copyright 2010 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 199 matching lines @@
   memset(sampler_window_, 0, sizeof(sampler_window_));
   memset(sampler_window_weight_, 0, sizeof(sampler_window_weight_));
 }
 
 
 int RuntimeProfiler::LookupSample(JSFunction* function) {
   int weight = 0;
   for (int i = 0; i < kSamplerWindowSize; i++) {
     Object* sample = sampler_window_[i];
     if (sample != NULL) {
-      if (function == sample) {
+      bool fits = FLAG_lookup_sample_by_shared
+          ? (function->shared() == JSFunction::cast(sample)->shared())
+          : (function == JSFunction::cast(sample));
+      if (fits) {
         weight += sampler_window_weight_[i];
       }
     }
   }
   return weight;
 }
 
 
 void RuntimeProfiler::AddSample(JSFunction* function, int weight) {
   ASSERT(IsPowerOf2(kSamplerWindowSize));
@@ skipping 238 matching lines @@
     } else {
       return RuntimeProfiler::WaitForSomeIsolateToEnterJS();
     }
   }
 #endif
   return false;
 }
 
 
 } }  // namespace v8::internal