Map and Descriptor printing enhanced a bit.

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"
 #include "src/ostreams.h"
 
 namespace v8 {
@@ skipping 44 matching lines @@
     case FIELD:
       os << "normal: ";
       break;
     case CALLBACKS:
       os << "callbacks: ";
       break;
     case CONSTANT:
       UNREACHABLE();
       break;
   }
-  return os << "dictionary_index: " << details.dictionary_index()
+  return os << " dictionary_index: " << details.dictionary_index()
             << ", attrs: " << details.attributes() << ")";
 }
 
 
 // Outputs PropertyDetails as a descriptor array details.
 std::ostream& operator<<(std::ostream& os,
                          const FastPropertyDetails& details_fast) {
   const PropertyDetails& details = details_fast.details;
   os << "(";
   switch (details.type()) {
@@ skipping 20 matching lines @@
     os << *this;
   } else {
     os << FastPropertyDetails(*this);
   }
   os << "\n" << std::flush;
 }
 #endif
 
 
 std::ostream& operator<<(std::ostream& os, const Descriptor& d) {
-  return os << "Descriptor " << Brief(*d.GetKey()) << " @ "
-            << Brief(*d.GetValue()) << " "
-            << FastPropertyDetails(d.GetDetails());
+  Object* value = *d.GetValue();
+  os << "Descriptor " << Brief(*d.GetKey()) << " @ " << Brief(value) << " ";
+  if (value->IsAccessorPair()) {
+    AccessorPair* pair = AccessorPair::cast(value);
+    os << "(get: " << Brief(pair->getter())
+       << ", set: " << Brief(pair->setter()) << ") ";
+  }
+  os << FastPropertyDetails(d.GetDetails());
+  return os;
 }
 
 } }  // namespace v8::internal