Implement class hierarchy analysis in the VM.

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 535 matching lines @@
   // Set the resolved or unresolved factory class of this interface.
   void set_factory_class(const Object& value) const;
 
   // Interfaces is an array of Types.
   RawArray* interfaces() const { return raw_ptr()->interfaces_; }
   void set_interfaces(const Array& value) const;
   static intptr_t interfaces_offset() {
     return OFFSET_OF(RawClass, interfaces_);
   }
 
+  // Returns the list of classes having this class as direct superclass.
+  RawGrowableObjectArray* direct_subclasses() const {
+    return raw_ptr()->direct_subclasses_;
+  }
+  void AddDirectSubclass(const Class& subclass) const;
+  // TODO(regis): Implement RemoveDirectSubclass for class unloading support.
+
   // Check if this class represents the class of null.
   bool IsNullClass() const { return raw() == Object::null_class(); }
 
   // Check if this class represents the 'Dynamic' class.
   bool IsDynamicClass() const { return raw() == Object::dynamic_class(); }
 
   // Check if this class represents the 'void' class.
   bool IsVoidClass() const { return raw() == Object::void_class(); }
 
   // Check if this class represents the 'Object' class.
@@ skipping 4965 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_