Disable tracking of double fields during snapshot creation.

src/bootstrapper.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 2538 matching lines @@
   ASSERT(!function_map_writable_prototype_.is_null());
   ASSERT(!strict_mode_function_map_writable_prototype_.is_null());
 
   // Replace function instance maps to make prototype writable.
   native_context()->set_function_map(*function_map_writable_prototype_);
   native_context()->set_strict_mode_function_map(
       *strict_mode_function_map_writable_prototype_);
 }
 
 
+class NoTrackDoubleFieldsForSerializerScope {
+ public:
+  NoTrackDoubleFieldsForSerializerScope() : flag_(FLAG_track_double_fields) {
+    if (Serializer::enabled()) {
+      // Disable tracking double fields because heap numbers treated as
+      // immutable by the serializer.
+      FLAG_track_double_fields = false;
+    }
+  }
+  ~NoTrackDoubleFieldsForSerializerScope() {
+    FLAG_track_double_fields = flag_;
+  }
+
+ private:
+  bool flag_;
+};
+
+
 Genesis::Genesis(Isolate* isolate,
                  Handle<Object> global_object,
                  v8::Handle<v8::ObjectTemplate> global_template,
                  v8::ExtensionConfiguration* extensions)
     : isolate_(isolate),
       active_(isolate->bootstrapper()) {
+  NoTrackDoubleFieldsForSerializerScope disable_double_tracking_for_serializer;
   result_ = Handle<Context>::null();
   // If V8 cannot be initialized, just return.
   if (!V8::Initialize(NULL)) return;
 
   // Before creating the roots we must save the context and restore it
   // on all function exits.
   SaveContext saved_context(isolate);
 
   // During genesis, the boilerplate for stack overflow won't work until the
   // environment has been at least partially initialized. Add a stack check
@@ skipping 137 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   ASSERT(!IsActive());
 }
 
 } }  // namespace v8::internal