Implement enough of the partial snapshots that we can deserialize...

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 221 matching lines @@
 // A Deserializer reads a snapshot and reconstructs the Object graph it defines.
 class Deserializer: public SerDes {
  public:
   // Create a deserializer from a snapshot byte source.
   explicit Deserializer(SnapshotByteSource* source);
 
   virtual ~Deserializer() { }
 
   // Deserialize the snapshot into an empty heap.
   void Deserialize();
+
+  // Deserialize a single object and the objects reachable from it.
+  void DeserializePartial(Object** root);
+
 #ifdef DEBUG
   virtual void Synchronize(const char* tag);
 #endif
 
+  static void TearDown();
+
  private:
   virtual void VisitPointers(Object** start, Object** end);
 
   virtual void VisitExternalReferences(Address* start, Address* end) {
     UNREACHABLE();
   }
 
   virtual void VisitRuntimeEntry(RelocInfo* rinfo) {
     UNREACHABLE();
   }
 
   void ReadChunk(Object** start, Object** end, int space, Address address);
   HeapObject* GetAddressFromStart(int space);
   inline HeapObject* GetAddressFromEnd(int space);
   Address Allocate(int space_number, Space* space, int size);
   void ReadObject(int space_number, Space* space, Object** write_back);
 
   // Keep track of the pages in the paged spaces.
   // (In large object space we are keeping track of individual objects
   // rather than pages.)  In new space we just need the address of the
   // first object and the others will flow from that.
   List<Address> pages_[SerDes::kNumberOfSpaces];
 
   SnapshotByteSource* source_;
-  ExternalReferenceDecoder* external_reference_decoder_;
+  static ExternalReferenceDecoder* external_reference_decoder_;
   // This is the address of the next object that will be allocated in each
   // space.  It is used to calculate the addresses of back-references.
   Address high_water_[LAST_SPACE + 1];
   // This is the address of the most recent object that was allocated.  It
   // is used to set the location of the new page when we encounter a
   // START_NEW_PAGE_SERIALIZATION tag.
   Address last_object_address_;
 
   DISALLOW_COPY_AND_ASSIGN(Deserializer);
 };
@@ skipping 14 matching lines @@
  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);
   void VisitPointers(Object** start, Object** end);
   // You can call this after serialization to find out how much space was used
   // in each space.
   int CurrentAllocationAddress(int space) {
-    if (SpaceIsLarge(space)) space = LO_SPACE;
+    if (SpaceIsLarge(space)) return large_object_total_;
     return fullness_[space];
   }
 
   static void Enable() {
     if (!serialization_enabled_) {
       ASSERT(!too_late_to_enable_now_);
     }
     serialization_enabled_ = true;
   }
 
@@ skipping 69 matching lines @@
   // just numbered sequentially since relative addresses make no
   // sense in large object space.
   int fullness_[LAST_SPACE + 1];
   SnapshotByteSink* sink_;
   int current_root_index_;
   ExternalReferenceEncoder* external_reference_encoder_;
   bool partial_;
   static bool serialization_enabled_;
   // Did we already make use of the fact that serialization was not enabled?
   static bool too_late_to_enable_now_;
+  int large_object_total_;
 
   friend class ObjectSerializer;
   friend class Deserializer;
 
   DISALLOW_COPY_AND_ASSIGN(Serializer);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_