Gentle start with removing explicit interfaces

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 856 matching lines @@
 
   // Check if this type represents the 'bool' interface.
   bool IsBoolInterface() const;
 
   // Check if this type represents the 'int' interface.
   bool IsIntInterface() const;
 
   // Check if this type represents the 'double' interface.
   bool IsDoubleInterface() const;
 
-  // Check if this type represents the 'num' interface.
-  bool IsNumberInterface() const;
+  // Check if this type represents the 'num' type.
+  bool IsNumberType() const;
 
   // Check if this type represents the 'String' interface.
   bool IsStringInterface() const;
 
-  // Check if this type represents the 'Function' interface.
-  bool IsFunctionInterface() const;
+  // Check if this type represents the 'Function' type.
+  bool IsFunctionType() const;
 
   // Check if this type represents the 'List' interface.
   bool IsListInterface() const;
 
   // Check if this type is an interface type.
   bool IsInterfaceType() const {
     if (!HasResolvedTypeClass()) {
       return false;
     }
     const Class& cls = Class::Handle(type_class());
@@ skipping 91 matching lines @@
   // The 'bool' interface type.
   static RawType* BoolInterface();
 
   // The 'int' interface type.
   static RawType* IntInterface();
 
   // The 'double' interface type.
   static RawType* DoubleInterface();
 
   // The 'num' interface type.
-  static RawType* NumberInterface();
+  static RawType* Number();
 
   // The 'String' interface type.
   static RawType* StringInterface();
 
   // The 'Function' interface type.
-  static RawType* FunctionInterface();
+  static RawType* Function();
 
   // The 'List' interface type.
   static RawType* ListInterface();
 
   // The finalized type of the given non-parameterized class.
   static RawType* NewNonParameterizedType(const Class& type_class);
 
   static RawType* New(const Object& clazz,
                       const AbstractTypeArguments& arguments,
                       intptr_t token_pos,
@@ skipping 2124 matching lines @@
     // Number is an abstract class.
     UNREACHABLE();
     return false;
   }
   virtual bool IsNegative() const {
     // Number is an abstract class.
     UNREACHABLE();
     return false;
   }
   OBJECT_IMPLEMENTATION(Number, Instance);
+  friend class Class;
 };
 
 
 class Integer : public Number {
  public:
   static RawInteger* New(const String& str, Heap::Space space = Heap::kNew);
   static RawInteger* New(int64_t value, Heap::Space space = Heap::kNew);
 
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
@@ skipping 2065 matching lines @@
   void SetExternalData(ExternalByteArrayData<double>* data) {
     raw_ptr()->external_data_ = data;
   }
 
   HEAP_OBJECT_IMPLEMENTATION(ExternalFloat64Array, ByteArray);
   friend class ByteArray;
   friend class Class;
 };
 
 
+// DartFunction represents the abstract Dart class 'Function'.
+class DartFunction : public Instance {
+ private:
+  HEAP_OBJECT_IMPLEMENTATION(DartFunction, Instance);
+  friend class Class;
+  friend class Instance;
+};
+
+
 class Closure : public Instance {
  public:
   RawFunction* function() const { return raw_ptr()->function_; }
   static intptr_t function_offset() {
     return OFFSET_OF(RawClosure, function_);
   }
 
   RawContext* context() const { return raw_ptr()->context_; }
   static intptr_t context_offset() { return OFFSET_OF(RawClosure, context_); }
 
@@ skipping 276 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_