Add flag 'implements' to class, it is set anytime someone implements this class. This is a way to r…

runtime/vm/object_test.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 "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 173 matching lines @@
   const String& field_name = String::Handle(Symbols::New("the_field"));
   const Field& field = Field::Handle(
        Field::New(field_name, false, false, false, one_field_class, 0));
   one_fields.SetAt(0, field);
   one_field_class.SetFields(one_fields);
   one_field_class.Finalize();
   intptr_t header_size = sizeof(RawObject);
   EXPECT_EQ(Utils::RoundUp((header_size + (1 * kWordSize)), kObjectAlignment),
             one_field_class.instance_size());
   EXPECT_EQ(header_size, field.Offset());
+  EXPECT(!one_field_class.is_implemented());
+  one_field_class.set_is_implemented();
+  EXPECT(one_field_class.is_implemented());
 }
 
 
 TEST_CASE(Interface) {
   String& class_name = String::Handle(Symbols::New("EmptyClass"));
   Script& script = Script::Handle();
   const Class& factory_class =
       Class::Handle(Class::New(class_name, script, Scanner::kDummyTokenIndex));
   const Array& no_fields = Array::Handle(Object::empty_array());
   // Finalizes the class.
@@ skipping 3044 matching lines @@
   EXPECT_NE(test1.SourceFingerprint(), test3.SourceFingerprint());
   EXPECT_NE(test3.SourceFingerprint(), test4.SourceFingerprint());
   EXPECT_NE(test4.SourceFingerprint(), test5.SourceFingerprint());
   EXPECT_NE(test5.SourceFingerprint(), test6.SourceFingerprint());
   EXPECT_EQ(test6.SourceFingerprint(), test7.SourceFingerprint());
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart