Support sending and receiving Capability objects from C code.

runtime/vm/dart_api_message.cc

 // 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.
 
 #include "vm/dart_api_message.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 #include "vm/symbols.h"
 #include "vm/unicode.h"
 
@@ skipping 663 matching lines @@
     }
     case kSendPortCid: {
       int64_t value64 = Read<int64_t>();
       int64_t originId = Read<uint64_t>();
       Dart_CObject* object = AllocateDartCObject(Dart_CObject_kSendPort);
       object->value.as_send_port.id = value64;
       object->value.as_send_port.origin_id = originId;
       AddBackRef(object_id, object, kIsDeserialized);
       return object;
     }
+    case kCapabilityCid: {
+      int64_t id = Read<int64_t>();
+      Dart_CObject* object = AllocateDartCObject(Dart_CObject_kCapability);
+      object->value.as_capability.id = id;
+      AddBackRef(object_id, object, kIsDeserialized);
+      return object;
+    }
 
 #define READ_TYPED_DATA_HEADER(type)                                           \
       intptr_t len = ReadSmiValue();                                           \
       Dart_CObject* object =                                                   \
           AllocateDartCObjectTypedData(Dart_TypedData_k##type, len);           \
       AddBackRef(object_id, object, kIsDeserialized);                          \
 
 
 #define READ_TYPED_DATA(type, ctype)                                           \
     {                                                                          \
@@ skipping 567 matching lines @@
       uint8_t* data = object->value.as_external_typed_data.data;
       void* peer = object->value.as_external_typed_data.peer;
       Dart_WeakPersistentHandleFinalizer callback =
           object->value.as_external_typed_data.callback;
       WriteSmi(length);
       WriteRawPointerValue(reinterpret_cast<intptr_t>(data));
       WriteRawPointerValue(reinterpret_cast<intptr_t>(peer));
       WriteRawPointerValue(reinterpret_cast<intptr_t>(callback));
       break;
     }
+    case Dart_CObject_kCapability: {
+      WriteInlinedHeader(object);
+      WriteIndexedObject(kCapabilityCid);
+      WriteTags(0);
+      Write<uint64_t>(object->value.as_capability.id);
+      break;
+    }
     default:
       UNREACHABLE();
   }
 
   return true;
 }
 
 
 bool ApiMessageWriter::WriteCMessage(Dart_CObject* object) {
   bool success = WriteCObject(object);
   if (!success) {
     UnmarkAllCObjects(object);
     return false;
   }
   // Write out all objects that were added to the forward list and have
   // not been serialized yet. These would typically be fields of arrays.
   // NOTE: The forward list might grow as we process the list.
   for (intptr_t i = 0; i < forward_id_; i++) {
     success = WriteForwardedCObject(forward_list_[i]);
     if (!success) {
       UnmarkAllCObjects(object);
       return false;
     }
   }
   UnmarkAllCObjects(object);
   return true;
 }
 
 }  // namespace dart