Refactor copying of maps and descriptor 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 447 matching lines @@
 
 
 Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateFunctionPrototype(*function),
       JSObject);
 }
 
 
-Handle<Map> Factory::CopyMapDropDescriptors(Handle<Map> src) {
-  CALL_HEAP_FUNCTION(isolate(), src->CopyDropDescriptors(), Map);
+Handle<Map> Factory::CopyWithPreallocatedFieldDescriptors(Handle<Map> src) {
+  CALL_HEAP_FUNCTION(
+      isolate(), src->CopyWithPreallocatedFieldDescriptors(), Map);
 }
 
 
 Handle<Map> Factory::CopyMap(Handle<Map> src,
                              int extra_inobject_properties) {
-  Handle<Map> copy = CopyMapDropDescriptors(src);
+  Handle<Map> copy = CopyWithPreallocatedFieldDescriptors(src);
   // Check that we do not overflow the instance size when adding the
   // extra inobject properties.
   int instance_size_delta = extra_inobject_properties * kPointerSize;
   int max_instance_size_delta =
       JSObject::kMaxInstanceSize - copy->instance_size();
   if (instance_size_delta > max_instance_size_delta) {
     // If the instance size overflows, we allocate as many properties
     // as we can as inobject properties.
     instance_size_delta = max_instance_size_delta;
     extra_inobject_properties = max_instance_size_delta >> kPointerSizeLog2;
@@ skipping 1005 matching lines @@
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return Handle<Object>(value
                         ? isolate()->heap()->true_value()
                         : isolate()->heap()->false_value());
 }
 
 
 } }  // namespace v8::internal