Add a VM defined class MirrorReference as an opaque pointer for Dart code to VM internal objects.

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 48 matching lines @@
         V(Mint)                                                                \
         V(Bigint)                                                              \
       V(Double)                                                                \
     V(Bool)                                                                    \
     V(GrowableObjectArray)                                                     \
     V(TypedData)                                                               \
     V(ExternalTypedData)                                                       \
     V(Stacktrace)                                                              \
     V(JSRegExp)                                                                \
     V(WeakProperty)                                                            \
+    V(MirrorReference)                                                         \
     V(DartFunction)                                                            \
     V(Float32x4)                                                               \
     V(Uint32x4)                                                                \
 
 #define CLASS_LIST_ARRAYS(V)                                                   \
   V(Array)                                                                     \
     V(ImmutableArray)                                                          \
 
 #define CLASS_LIST_STRINGS(V)                                                  \
   V(String)                                                                    \
@@ skipping 1441 matching lines @@
     return reinterpret_cast<RawObject**>(&ptr()->value_);
   }
 
   friend class GCMarker;
   friend class MarkingVisitor;
   friend class Scavenger;
   friend class ScavengerVisitor;
 };
 
 
+class RawMirrorReference : public RawInstance {

[siva, 2013/07/02 01:07:11]

Could you add a brief comment on top indicating that this class is used by the
mirrors library to reflect on VM objects like library, class etc.

+  RAW_HEAP_OBJECT_IMPLEMENTATION(MirrorReference);
+
+  RawObject** from() {
+    return reinterpret_cast<RawObject**>(&ptr()->referent_);
+  }
+  RawObject* referent_;
+  RawObject** to() {
+    return reinterpret_cast<RawObject**>(&ptr()->referent_);
+  }
+};
+
+
 // Class Id predicates.
 
 inline bool RawObject::IsErrorClassId(intptr_t index) {
   // Make sure this function is updated when new Error types are added.
   ASSERT(kApiErrorCid == kErrorCid + 1 &&
          kLanguageErrorCid == kErrorCid + 2 &&
          kUnhandledExceptionCid == kErrorCid + 3 &&
          kUnwindErrorCid == kErrorCid + 4 &&
          kInstanceCid == kErrorCid + 5);
   return (index >= kErrorCid && index < kInstanceCid);
@@ skipping 150 matching lines @@
   // Make sure this is updated when new TypedData types are added.
   ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 12);
   ASSERT(kExternalTypedDataInt8ArrayCid == kTypedDataInt8ArrayViewCid + 13);
   ASSERT(kNullCid == kExternalTypedDataInt8ArrayCid + 12);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_