Track Hydrogen statistics on a per-Isolate basis

src/isolate.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 1774 matching lines @@
     }
 
     if (FLAG_marking_threads > 0) {
       for (int i = 0; i < FLAG_marking_threads; i++) {
         marking_thread_[i]->Stop();
         delete marking_thread_[i];
       }
       delete[] marking_thread_;
     }
 
-    if (FLAG_hydrogen_stats) HStatistics::Instance()->Print();
+    if (FLAG_hydrogen_stats) GetHStatistics()->Print();
 
     // We must stop the logger before we tear down other components.
     logger_->EnsureTickerStopped();
 
     delete deoptimizer_data_;
     deoptimizer_data_ = NULL;
     if (FLAG_preemption) {
       v8::Locker locker(reinterpret_cast<v8::Isolate*>(this));
       v8::Locker::StopPreemption();
     }
@@ skipping 505 matching lines @@
   }
   if (deferred->next_ != NULL) {
     deferred->next_->previous_ = deferred->previous_;
   }
   if (deferred->previous_ != NULL) {
     deferred->previous_->next_ = deferred->next_;
   }
 }
 
 
+HStatistics* Isolate::GetHStatistics() {
+  if (hstatistics() == NULL) set_hstatistics(new HStatistics());
+  return hstatistics();
+}
+
+
 HTracer* Isolate::GetHTracer() {
   if (htracer() == NULL) set_htracer(new HTracer(id()));
   return htracer();
 }
 
 
 CodeStubInterfaceDescriptor*
     Isolate::code_stub_interface_descriptor(int index) {
   return code_stub_interface_descriptors_ + index;
 }
 
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal