Implement external strings.

runtime/vm/class_finalizer.cc

 // Copyright (c) 2011, 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/class_finalizer.h"
 
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/longjump.h"
@@ skipping 183 matching lines @@
   cls = object_store->object_class();
   ASSERT(Instance::InstanceSize() == cls.instance_size());
   cls = object_store->smi_class();
   ASSERT(Smi::InstanceSize() == cls.instance_size());
   cls = object_store->one_byte_string_class();
   ASSERT(OneByteString::InstanceSize() == cls.instance_size());
   cls = object_store->two_byte_string_class();
   ASSERT(TwoByteString::InstanceSize() == cls.instance_size());
   cls = object_store->four_byte_string_class();
   ASSERT(FourByteString::InstanceSize() == cls.instance_size());
+  cls = object_store->external_one_byte_string_class();
+  ASSERT(ExternalOneByteString::InstanceSize() == cls.instance_size());
+  cls = object_store->external_two_byte_string_class();
+  ASSERT(ExternalTwoByteString::InstanceSize() == cls.instance_size());
+  cls = object_store->external_four_byte_string_class();
+  ASSERT(ExternalFourByteString::InstanceSize() == cls.instance_size());
   cls = object_store->double_class();
   ASSERT(Double::InstanceSize() == cls.instance_size());
   cls = object_store->mint_class();
   ASSERT(Mint::InstanceSize() == cls.instance_size());
   cls = object_store->bigint_class();
   ASSERT(Bigint::InstanceSize() == cls.instance_size());
   cls = object_store->bool_class();
   ASSERT(Bool::InstanceSize() == cls.instance_size());
   cls = object_store->array_class();
   ASSERT(Array::InstanceSize() == cls.instance_size());
@@ skipping 796 matching lines @@
   ASSERT(msg_buffer != NULL);
   va_list args;
   va_start(args, format);
   OS::VSNPrint(msg_buffer, kBufferLength, format, args);
   va_end(args);
   isolate->long_jump_base()->Jump(1, msg_buffer);
   UNREACHABLE();
 }
 
 }  // namespace dart