Introduce JSFunction::EnsureHasInitialMap method.

src/objects.cc

 // Copyright 2013 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 9874 matching lines @@
 
   ASSERT(map() == (shared()->is_classic_mode()
                    ? native_context->function_map()
                    : native_context->strict_mode_function_map()));
 
   set_map(no_prototype_map);
   set_prototype_or_initial_map(no_prototype_map->GetHeap()->the_hole_value());
 }
 
 
+void JSFunction::EnsureHasInitialMap(Handle<JSFunction> function) {
+  if (function->has_initial_map()) return;
+  Isolate* isolate = function->GetIsolate();
+  Handle<Map> initial_map = isolate->factory()->NewInitialMap(function);
+  function->set_initial_map(*initial_map);
+  initial_map->set_constructor(*function);
+}
+
+
 void JSFunction::SetInstanceClassName(String* name) {
   shared()->set_instance_class_name(name);
 }
 
 
 void JSFunction::PrintName(FILE* out) {
   SmartArrayPointer<char> name = shared()->DebugName()->ToCString();
   PrintF(out, "%s", *name);
 }
 
@@ skipping 6481 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal