Support large objects in the serializer/deserializer.

src/mksnapshot.cc

 // Copyright 2006-2008 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 <errno.h>
 #include <stdio.h>
 #ifdef COMPRESS_STARTUP_DATA_BZ2
 #include <bzlib.h>
 #endif
 #include <signal.h>
@@ skipping 49 matching lines @@
 
   void SetStartupBlobFile(const char* startup_blob_file) {
     if (startup_blob_file != NULL)
       startup_blob_file_ = GetFileDescriptorOrDie(startup_blob_file);
   }
 
   void WriteSnapshot(const i::List<i::byte>& snapshot_data,
                      const i::Serializer& serializer,
                      const i::List<i::byte>& context_snapshot_data,
                      const i::Serializer& context_serializer) const {
+    // The serializer supports large objects, but we don't expect any in the
+    // the startup snapshot.  If this changes, we need to write it into the
+    // snapshot file and read it for deserialization.
+    CHECK_EQ(0, serializer.large_objects_total_size());
+    CHECK_EQ(0, context_serializer.large_objects_total_size());
     WriteSnapshotFile(snapshot_data, serializer,
                       context_snapshot_data, context_serializer);
     MaybeWriteStartupBlob(snapshot_data, serializer,
                           context_snapshot_data, context_serializer);
   }
 
  private:
   void MaybeWriteStartupBlob(const i::List<i::byte>& snapshot_data,
                              const i::Serializer& serializer,
                              const i::List<i::byte>& context_snapshot_data,
                              const i::Serializer& context_serializer) const {
     if (!startup_blob_file_)
       return;
 
     i::List<i::byte> startup_blob;
     i::ListSnapshotSink sink(&startup_blob);
 
-    int spaces[] = {
-        i::NEW_SPACE, i::OLD_POINTER_SPACE, i::OLD_DATA_SPACE, i::CODE_SPACE,
-        i::MAP_SPACE, i::CELL_SPACE,  i::PROPERTY_CELL_SPACE
-    };
+    // Large object space reservation is not necessary.
+    int spaces[] = {i::NEW_SPACE,          i::OLD_POINTER_SPACE,
+                    i::OLD_DATA_SPACE,     i::CODE_SPACE,
+                    i::MAP_SPACE,          i::CELL_SPACE,
+                    i::PROPERTY_CELL_SPACE};
 
     i::byte* snapshot_bytes = snapshot_data.begin();
     sink.PutBlob(snapshot_bytes, snapshot_data.length(), "snapshot");
     for (size_t i = 0; i < arraysize(spaces); ++i)
       sink.PutInt(serializer.CurrentAllocationAddress(spaces[i]), "spaces");
 
     i::byte* context_bytes = context_snapshot_data.begin();
     sink.PutBlob(context_bytes, context_snapshot_data.length(), "context");
     for (size_t i = 0; i < arraysize(spaces); ++i)
       sink.PutInt(context_serializer.CurrentAllocationAddress(spaces[i]),
@@ skipping 328 matching lines @@
       writer.WriteSnapshot(snapshot_data, ser, context_data, context_ser);
     }
   }
 
   isolate->Dispose();
   V8::Dispose();
   V8::ShutdownPlatform();
   delete platform;
   return 0;
 }