Explicitly set expected number of properties for instances of builtin types.

src/runtime.cc

 // Copyright 2006-2009 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 1683 matching lines @@
 
   CONVERT_ARG_CHECKED(JSFunction, target, 0);
   Handle<Object> code = args.at<Object>(1);
 
   Handle<Context> context(target->context());
 
   if (!code->IsNull()) {
     RUNTIME_ASSERT(code->IsJSFunction());
     Handle<JSFunction> fun = Handle<JSFunction>::cast(code);
     Handle<SharedFunctionInfo> shared(fun->shared());
-    SetExpectedNofProperties(target, shared->expected_nof_properties());
 
     if (!EnsureCompiled(shared, KEEP_EXCEPTION)) {
       return Failure::Exception();
     }
     // Set the code, scope info, formal parameter count,
     // and the length of the target function.
     target->shared()->set_code(shared->code());
     target->set_code(shared->code());
     target->shared()->set_scope_info(shared->scope_info());
     target->shared()->set_length(shared->length());
@@ skipping 24 matching lines @@
     // It's okay to skip the write barrier here because the literals
     // are guaranteed to be in old space.
     target->set_literals(*literals, SKIP_WRITE_BARRIER);
   }
 
   target->set_context(*context);
   return *target;
 }
 
 
+static Object* Runtime_SetExpectedNumberOfProperties(Arguments args) {
+  HandleScope scope;
+  ASSERT(args.length() == 2);
+  CONVERT_ARG_CHECKED(JSFunction, function, 0);
+  CONVERT_SMI_CHECKED(num, args[1]);
+  RUNTIME_ASSERT(num >= 0);
+  SetExpectedNofProperties(function, num);
+  return Heap::undefined_value();
+}
+
+
 static Object* CharFromCode(Object* char_code) {
   uint32_t code;
   if (char_code->ToArrayIndex(&code)) {
     if (code <= 0xffff) {
       return Heap::LookupSingleCharacterStringFromCode(code);
     }
   }
   return Heap::empty_string();
 }
 
@@ skipping 8949 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(false);
   }
 }
 
 
 } }  // namespace v8::internal