Remove script source from the snapshot in order to reduce the size and to make the image size small…

vm/raw_object_snapshot.cc

 // 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.
 
 #include "vm/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/visitor.h"
 
@@ skipping 624 matching lines @@
   // Allocate script object.
   Script& script = Script::ZoneHandle(reader->isolate(), NEW_OBJECT(Script));
   reader->AddBackwardReference(object_id, &script);
 
   // Set the object tags.
   script.set_tags(tags);
 
   // Set all the object fields.
   // TODO(5411462): Need to assert No GC can happen here, even though
   // allocations may happen.
-  intptr_t num_flds = (script.raw()->to() - script.raw()->from());
-  for (intptr_t i = 0; i <= num_flds; i++) {
-    *(script.raw()->from() + i) = reader->ReadObject();
-  }
+  *reader->StringHandle() ^= reader->ReadObject();
+  script.set_url(*reader->StringHandle());
+  *reader->StringHandle() ^= String::null();
+  script.set_source(*reader->StringHandle());
+  TokenStream& stream = TokenStream::Handle();
+  stream ^= reader->ReadObject();
+  script.set_tokens(stream);
 
   return script.raw();
 }
 
 
 void RawScript::WriteTo(SnapshotWriter* writer,
                         intptr_t object_id,
                         Snapshot::Kind kind) {
   ASSERT(writer != NULL);
   ASSERT(tokens_ != TokenStream::null());
   ASSERT(kind != Snapshot::kMessage && !IsCreatedFromSnapshot());
 
   // Write out the serialization header value for this object.
   writer->WriteSerializationMarker(kInlined, object_id);
 
   // Write out the class and tags information.
   writer->WriteObjectHeader(Object::kScriptClass, ptr()->tags_);
 
   // Write out all the object pointer fields.
-  SnapshotWriterVisitor visitor(writer);
-  visitor.VisitPointers(from(), to());
+  writer->WriteObject(ptr()->url_);
+  writer->WriteObject(ptr()->tokens_);
 }
 
 
 RawLibrary* Library::ReadFrom(SnapshotReader* reader,
                               intptr_t object_id,
                               intptr_t tags,
                               Snapshot::Kind kind) {
   ASSERT(reader != NULL);
   ASSERT(kind != Snapshot::kMessage);
 
@@ skipping 1700 matching lines @@
   writer->Write<RawObject*>(ptr()->num_bracket_expressions_);
   writer->WriteObject(ptr()->pattern_);
   writer->WriteIntptrValue(ptr()->type_);
   writer->WriteIntptrValue(ptr()->flags_);
 
   // Do not write out the data part which is native.
 }
 
 
 }  // namespace dart