Implement tracking and optimizations of packed arrays

src/factory.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 757 matching lines @@
   // Set up the code pointer in both the shared function info and in
   // the function itself.
   function->shared()->set_code(*code);
   function->set_code(*code);
 
   if (force_initial_map ||
       type != JS_OBJECT_TYPE ||
       instance_size != JSObject::kHeaderSize) {
     Handle<Map> initial_map = NewMap(type,
                                      instance_size,
-                                     FAST_SMI_ONLY_ELEMENTS);
+                                     GetInitialFastElementsKind());
     function->set_initial_map(*initial_map);
     initial_map->set_constructor(*function);
   }
 
   // Set function.prototype and give the prototype a constructor
   // property that refers to the function.
   SetPrototypeProperty(function, prototype);
   // Currently safe because it is only invoked from Genesis.
   CHECK_NOT_EMPTY_HANDLE(isolate(),
                          JSObject::SetLocalPropertyIgnoreAttributes(
@@ skipping 217 matching lines @@
 
 void Factory::EnsureCanContainHeapObjectElements(Handle<JSArray> array) {
   CALL_HEAP_FUNCTION_VOID(
       isolate(),
       array->EnsureCanContainHeapObjectElements());
 }
 
 
 void Factory::EnsureCanContainElements(Handle<JSArray> array,
                                        Handle<FixedArrayBase> elements,
+                                       uint32_t length,
                                        EnsureElementsMode mode) {
   CALL_HEAP_FUNCTION_VOID(
       isolate(),
-      array->EnsureCanContainElements(*elements, mode));
+      array->EnsureCanContainElements(*elements, length, mode));
 }
 
 
 Handle<JSProxy> Factory::NewJSProxy(Handle<Object> handler,
                                     Handle<Object> prototype) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSProxy(*handler, *prototype),
       JSProxy);
 }
@@ skipping 410 matching lines @@
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal