Allocate as many object-literal properties as possible inobject....

src/runtime.cc

 // Copyright 2006-2008 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 84 matching lines @@
 static Object* Runtime_CloneObjectLiteralBoilerplate(Arguments args) {
   CONVERT_CHECKED(JSObject, boilerplate, args[0]);
   return Heap::CopyJSObject(boilerplate);
 }
 
 
 static Handle<Map> ComputeObjectLiteralMap(
     Handle<Context> context,
     Handle<FixedArray> constant_properties,
     bool* is_result_from_cache) {
+  int number_of_properties = constant_properties->length() / 2;
   if (FLAG_canonicalize_object_literal_maps) {
     // First find prefix of consecutive symbol keys.
-    int number_of_properties = constant_properties->length()/2;
     int number_of_symbol_keys = 0;
     while ((number_of_symbol_keys < number_of_properties) &&
            (constant_properties->get(number_of_symbol_keys*2)->IsSymbol())) {
       number_of_symbol_keys++;
     }
     // Based on the number of prefix symbols key we decide whether
     // to use the map cache in the global context.
     const int kMaxKeys = 10;
     if ((number_of_symbol_keys == number_of_properties) &&
         (number_of_symbol_keys < kMaxKeys)) {
       // Create the fixed array with the key.
       Handle<FixedArray> keys = Factory::NewFixedArray(number_of_symbol_keys);
       for (int i = 0; i < number_of_symbol_keys; i++) {
         keys->set(i, constant_properties->get(i*2));
       }
       *is_result_from_cache = true;
       return Factory::ObjectLiteralMapFromCache(context, keys);
     }
   }
   *is_result_from_cache = false;
-  return Handle<Map>(context->object_function()->initial_map());
+  return Factory::CopyMap(
+      Handle<Map>(context->object_function()->initial_map()),
+      number_of_properties);
 }
 
 
 static Object* Runtime_CreateObjectLiteralBoilerplate(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 3);
   // Copy the arguments.
   Handle<FixedArray> literals = args.at<FixedArray>(0);
   int literals_index = Smi::cast(args[1])->value();
   Handle<FixedArray> constant_properties = args.at<FixedArray>(2);
@@ skipping 5757 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal