First step towards splitting a full snapshot into a vm isolate snapshot and a

runtime/vm/snapshot.h

 // Copyright (c) 2012, 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 "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
@@ skipping 659 matching lines @@
   friend class RawUserTag;
   friend class SnapshotWriterVisitor;
   friend class WriteInlinedObjectVisitor;
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriter);
 };
 
 
 class FullSnapshotWriter : public SnapshotWriter {
  public:
   static const intptr_t kInitialSize = 64 * KB;
-  FullSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
-      : SnapshotWriter(Snapshot::kFull, buffer, alloc, kInitialSize, true) {
-    ASSERT(buffer != NULL);
+  FullSnapshotWriter(uint8_t** vm_isolate_snapshot_buffer,
+                     uint8_t** isolate_snapshot_buffer,
+                     ReAlloc alloc)
+      : SnapshotWriter(Snapshot::kFull,
+                       isolate_snapshot_buffer,
+                       alloc,
+                       kInitialSize,
+                       true) {
+    ASSERT(vm_isolate_snapshot_buffer != NULL);
+    ASSERT(isolate_snapshot_buffer != NULL);
     ASSERT(alloc != NULL);
   }
   ~FullSnapshotWriter() { }
 
   // Writes a full snapshot of the Isolate.
   void WriteFullSnapshot();
 
+  intptr_t VmIsolateSnapshotSize() const { return 0; }
+  intptr_t IsolateSnapshotSize() const { return BytesWritten(); }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(FullSnapshotWriter);
 };
 
 
 class ScriptSnapshotWriter : public SnapshotWriter {
  public:
   static const intptr_t kInitialSize = 64 * KB;
   ScriptSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
       : SnapshotWriter(Snapshot::kScript, buffer, alloc, kInitialSize, true) {
@@ skipping 50 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_