Move Null class out of the VM isolate.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 387 matching lines @@
   static const Smi& smi_illegal_cid() {
     ASSERT(smi_illegal_cid_ != NULL);
     return *smi_illegal_cid_;
   }
   static const LanguageError& snapshot_writer_error() {
     ASSERT(snapshot_writer_error_ != NULL);
     return *snapshot_writer_error_;
   }
 
   static RawClass* class_class() { return class_class_; }
-  static RawClass* null_class() { return null_class_; }
   static RawClass* dynamic_class() { return dynamic_class_; }
   static RawClass* void_class() { return void_class_; }
   static RawClass* unresolved_class_class() { return unresolved_class_class_; }
   static RawClass* type_arguments_class() { return type_arguments_class_; }
   static RawClass* instantiated_type_arguments_class() {
       return instantiated_type_arguments_class_;
   }
   static RawClass* patch_class_class() { return patch_class_class_; }
   static RawClass* function_class() { return function_class_; }
   static RawClass* closure_data_class() { return closure_data_class_; }
@@ skipping 127 matching lines @@
   }
 
   static cpp_vtable handle_vtable_;
   static cpp_vtable builtin_vtables_[kNumPredefinedCids];
 
   // The static values below are singletons shared between the different
   // isolates. They are all allocated in the non-GC'd Dart::vm_isolate_.
   static RawObject* null_;
 
   static RawClass* class_class_;  // Class of the Class vm object.
-  static RawClass* null_class_;  // Class of the null object.
   static RawClass* dynamic_class_;  // Class of the 'dynamic' type.
   static RawClass* void_class_;  // Class of the 'void' type.
   static RawClass* unresolved_class_class_;  // Class of UnresolvedClass.
   // Class of the TypeArguments vm object.
   static RawClass* type_arguments_class_;
   static RawClass* instantiated_type_arguments_class_;  // Class of Inst..ments.
   static RawClass* patch_class_class_;  // Class of the PatchClass vm object.
   static RawClass* function_class_;  // Class of the Function vm object.
   static RawClass* closure_data_class_;  // Class of ClosureData vm obj.
   static RawClass* redirection_data_class_;  // Class of RedirectionData vm obj.
@@ skipping 3171 matching lines @@
   // The name of this type's class, i.e. without the type argument names of this
   // type.
   RawString* ClassName() const;
 
   // Check if this type represents the 'dynamic' type.
   bool IsDynamicType() const {
     return HasResolvedTypeClass() && (type_class() == Object::dynamic_class());
   }
 
   // Check if this type represents the 'Null' type.
-  bool IsNullType() const {
-    return HasResolvedTypeClass() && (type_class() == Object::null_class());
-  }
+  bool IsNullType() const;
 
   // Check if this type represents the 'void' type.
   bool IsVoidType() const {
     return HasResolvedTypeClass() && (type_class() == Object::void_class());
   }
 
   bool IsObjectType() const {
     return HasResolvedTypeClass() &&
     Class::Handle(type_class()).IsObjectClass();
   }
@@ skipping 2286 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_