- Preallocate non-named ArgumentsDescriptors with a small amount of parameters.

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 396 matching lines @@
   language_error_class_ = cls.raw();
 
   cls = Class::New<UnhandledException>();
   unhandled_exception_class_ = cls.raw();
 
   cls = Class::New<UnwindError>();
   unwind_error_class_ = cls.raw();
 
   ASSERT(class_class() != null_);
 
-  // Pre-allocate the Array and OneByteString class in the vm isolate so that
-  // we can create a symbol table and populate it with some frequently used
-  // strings as symbols.
+  // Pre-allocate classes in the vm isolate so that we can for example create a
+  // symbol table and populate it with some frequently used strings as symbols.
   cls = Class::New<Array>();
   isolate->object_store()->set_array_class(cls);
+  cls.set_type_arguments_field_offset(Array::type_arguments_offset());
+  cls = Class::New<ImmutableArray>();
+  isolate->object_store()->set_immutable_array_class(cls);
+  cls.set_type_arguments_field_offset(Array::type_arguments_offset());
   cls = Class::NewStringClass(kOneByteStringCid);
   isolate->object_store()->set_one_byte_string_class(cls);
   cls = Class::NewStringClass(kTwoByteStringCid);
   isolate->object_store()->set_two_byte_string_class(cls);
 
   // Allocate and initialize the empty_array instance.
   {
     uword address = heap->Allocate(Array::InstanceSize(0), Heap::kOld);
     *empty_array_ = reinterpret_cast<RawArray*>(address + kHeapObjectTag);
     InitializeObject(address, kArrayCid, Array::InstanceSize(0));
@@ skipping 11987 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart