Overlap type arguments of a type with the type arguments of its super type

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 714 matching lines @@
 
   // Return a TypeParameter if the type_name is a type parameter of this class.
   // Return null otherwise.
   RawTypeParameter* LookupTypeParameter(const String& type_name) const;
 
   // The type argument vector is flattened and includes the type arguments of
   // the super class.
   bool HasTypeArguments() const;
   intptr_t NumTypeArguments() const;
 
+  // Return the number of type arguments that are specific to this class, i.e.
+  // not overlapping with the type arguments of the super class of this class.
+  intptr_t NumOwnTypeArguments() const;
+
   // If this class is parameterized, each instance has a type_arguments field.
   static const intptr_t kNoTypeArguments = -1;
   intptr_t type_arguments_field_offset() const {
     ASSERT(is_type_finalized() || is_prefinalized());
     if (raw_ptr()->type_arguments_field_offset_in_words_ == kNoTypeArguments) {
       return kNoTypeArguments;
     }
     return raw_ptr()->type_arguments_field_offset_in_words_ * kWordSize;
   }
   void set_type_arguments_field_offset(intptr_t value_in_bytes) const {
@@ skipping 5505 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_