Support displaying of types in the observatory (back-end only for now):

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 916 matching lines @@
   RawFunction* LookupSetterFunction(const String& name) const;
   RawFunction* LookupFunctionAtToken(intptr_t token_pos) const;
   RawField* LookupInstanceField(const String& name) const;
   RawField* LookupStaticField(const String& name) const;
   RawField* LookupField(const String& name) const;
 
   RawLibraryPrefix* LookupLibraryPrefix(const String& name) const;
 
   void InsertCanonicalConstant(intptr_t index, const Instance& constant) const;
 
+  intptr_t NumCanonicalTypes() const;
+  intptr_t FindCanonicalTypeIndex(const Type& needle) const;
+  RawType* CanonicalTypeFromIndex(intptr_t idx) const;
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawClass));
   }
 
   bool is_implemented() const {
     return ImplementedBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_implemented() const;
 
   bool is_abstract() const {
@@ skipping 374 matching lines @@
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
       GrowableObjectArray* trail = NULL) const;
 
   // Runtime instantiation with canonicalization. Not to be used during type
   // finalization at compile time.
   RawTypeArguments* InstantiateAndCanonicalizeFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error) const;
 
+  // Return true if this type argument vector has cached instantiations.
+  bool HasInstantiations() const;
+
+  // Return the number of cached instantiations for this type argument vector.
+  intptr_t NumInstantiations() const;
+
   static intptr_t instantiations_offset() {
     return OFFSET_OF(RawTypeArguments, instantiations_);
   }
 
   static const intptr_t kBytesPerElement = kWordSize;
   static const intptr_t kMaxElements = kSmiMax / kBytesPerElement;
 
   static intptr_t length_offset() {
     return OFFSET_OF(RawTypeArguments, length_);
   }
@@ skipping 5339 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_