Changes to create an application snapshot which can be layered on top

vm/snapshot.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SNAPSHOT_H_
 #define VM_SNAPSHOT_H_
 
 #include "vm/allocation.h"
 #include "vm/assert.h"
 #include "vm/bitfield.h"
@@ skipping 380 matching lines @@
   SnapshotWriter(Snapshot::Kind kind, uint8_t** buffer, ReAlloc alloc)
       : stream_(buffer, alloc),
         kind_(kind),
         object_store_(Isolate::Current()->object_store()),
         forward_list_() {
     ASSERT(buffer != NULL);
     ASSERT(alloc != NULL);
   }
   ~SnapshotWriter() { }
 
+  // Snapshot kind.
+  Snapshot::Kind kind() const { return kind_; }
+
   // Size of the snapshot.
   intptr_t Size() const { return stream_.bytes_written(); }
 
   // Finalize the serialized buffer by filling in the header information
   // which comprises of a flag(full/partial snaphot) and the length of
   // serialzed bytes.
   void FinalizeBuffer() {
     int32_t* data = reinterpret_cast<int32_t*>(stream_.buffer());
     data[Snapshot::kLengthIndex] = stream_.bytes_written();
     data[Snapshot::kSnapshotFlagIndex] = kind_;
@@ skipping 64 matching lines @@
   Snapshot::Kind kind_;
   ObjectStore* object_store_;  // Object store for common classes.
   GrowableArray<ForwardObjectNode*> forward_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriter);
 };
 
 
 class ScriptSnapshotWriter : public SnapshotWriter {
  public:
-  ScriptSnapshotWriter(const Library& lib, uint8_t** buffer, ReAlloc alloc)
+  ScriptSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
       : SnapshotWriter(Snapshot::kScript, buffer, alloc) {
     ASSERT(buffer != NULL);
     ASSERT(alloc != NULL);
   }
   ~ScriptSnapshotWriter() { }
 
   // Writes a partial snapshot of the script.
-  void WriteScriptSnapshot();
+  void WriteScriptSnapshot(const Library& lib);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScriptSnapshotWriter);
 };
 
 
 // An object pointer visitor implementation which writes out
 // objects to a snap shot.
 class SnapshotWriterVisitor : public ObjectPointerVisitor {
  public:
   explicit SnapshotWriterVisitor(SnapshotWriter* writer) : writer_(writer) {}
 
   virtual void VisitPointers(RawObject** first, RawObject** last);
 
  private:
   SnapshotWriter* writer_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_