Fixed printing of external references.

src/serialize.cc

 // Copyright 2012 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/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 543 matching lines @@
 uint32_t ExternalReferenceEncoder::Encode(Address key) const {
   int index = IndexOf(key);
   ASSERT(key == NULL || index >= 0);
   return index >= 0 ?
          ExternalReferenceTable::instance(isolate_)->code(index) : 0;
 }
 
 
 const char* ExternalReferenceEncoder::NameOfAddress(Address key) const {
   int index = IndexOf(key);
-  return index >= 0 ?
-      ExternalReferenceTable::instance(isolate_)->name(index) : NULL;
+  return index >= 0 ? ExternalReferenceTable::instance(isolate_)->name(index)
+                    : "<unknown>";
 }
 
 
 int ExternalReferenceEncoder::IndexOf(Address key) const {
   if (key == NULL) return -1;
   HashMap::Entry* entry =
       const_cast<HashMap&>(encodings_).Lookup(key, Hash(key), false);
   return entry == NULL
       ? -1
       : static_cast<int>(reinterpret_cast<intptr_t>(entry->value));
@@ skipping 1329 matching lines @@
     deserializer.set_reservation(
         i, raw_data[CodeSerializer::kReservationsOffset + i]);
   }
   Object* root;
   deserializer.DeserializePartial(isolate, &root);
   deserializer.FlushICacheForNewCodeObjects();
   ASSERT(root->IsSharedFunctionInfo());
   return root;
 }
 } }  // namespace v8::internal