Fix issue 571: display descriptive names for code objects from snapshot.

src/serialize.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 129 matching lines @@
       accumulator = (accumulator | (snapshot_byte & 0x7f)) << 7;
     }
     UNREACHABLE();
     return accumulator;
   }
 
   bool AtEOF() {
     return position_ == length_;
   }
 
+  const int position() { return position_; }
+
  private:
   const byte* data_;
   int length_;
   int position_;
 };
 
 
 // It is very common to have a reference to the object at word 10 in space 2,
 // the object at word 5 in space 2 and the object at word 28 in space 4.  This
 // only works for objects in the first page of a space.
@@ skipping 127 matching lines @@
 
 
 class SnapshotByteSink {
  public:
   virtual ~SnapshotByteSink() { }
   virtual void Put(int byte, const char* description) = 0;
   virtual void PutSection(int byte, const char* description) {
     Put(byte, description);
   }
   void PutInt(uintptr_t integer, const char* description);
+  virtual int Position() = 0;
 };
 
 
 class Serializer : public SerDes {
  public:
   explicit Serializer(SnapshotByteSink* sink);
   // Serialize the current state of the heap.
   void Serialize();
   // Serialize a single object and the objects reachable from it.
   void SerializePartial(Object** obj);
@@ skipping 95 matching lines @@
 
   friend class ObjectSerializer;
   friend class Deserializer;
 
   DISALLOW_COPY_AND_ASSIGN(Serializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_