In-object double fields unboxing (for 64-bit only).

src/property.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/property.h"
 
 #include "src/handles-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 38 matching lines @@
     case INTERCEPTOR:
       return os << " -type = lookup interceptor\n";
     case NONEXISTENT:
       UNREACHABLE();
       break;
   }
   return os;
 }
 
 
+OStream& operator<<(OStream& os, const PropertyDetails& details) {
+  switch (details.type()) {
+    case NORMAL:
+      os << "(normal, dictionary_index: " << details.dictionary_index() << ")";
+      break;
+    case CONSTANT:
+      os << "(constant)\n";
+      break;
+    case FIELD:
+      os << "(field, field_index: " << details.field_index() << ", "
+         << details.representation().Mnemonic() << ")";
+      break;
+    case CALLBACKS:
+      os << "(callbacks)";
+      break;
+    case HANDLER:
+    case INTERCEPTOR:
+    case NONEXISTENT:
+      UNREACHABLE();
+      break;
+  }
+  return os;
+}
+
+
 OStream& operator<<(OStream& os, const Descriptor& d) {
   return os << "Descriptor " << Brief(*d.GetKey()) << " @ "
-            << Brief(*d.GetValue());
+            << Brief(*d.GetValue()) << " " << d.GetDetails();
 }
 
 } }  // namespace v8::internal