Introduce a SignatureData class so that signature functions can store both their

runtime/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/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 614 matching lines @@
   writer->WriteObjectImpl(ptr()->parent_function_, kAsInlinedObject);
 
   // Signature type.
   writer->WriteObjectImpl(ptr()->signature_type_, kAsInlinedObject);
 
   // Canonical static closure.
   writer->WriteObjectImpl(ptr()->closure_, kAsInlinedObject);
 }
 
 
+RawSignatureData* SignatureData::ReadFrom(SnapshotReader* reader,
+                                          intptr_t object_id,
+                                          intptr_t tags,
+                                          Snapshot::Kind kind,
+                                          bool as_reference) {
+  ASSERT(reader != NULL);
+  ASSERT(kind == Snapshot::kScript);
+
+  // Allocate signature data object.
+  SignatureData& data =
+      SignatureData::ZoneHandle(reader->zone(), SignatureData::New());
+  reader->AddBackRef(object_id, &data, kIsDeserialized);
+
+  // Set all the object fields.
+  READ_OBJECT_FIELDS(data, data.raw()->from(), data.raw()->to(),
+                     kAsInlinedObject);
+
+  return data.raw();
+}
+
+
+void RawSignatureData::WriteTo(SnapshotWriter* writer,
+                               intptr_t object_id,
+                               Snapshot::Kind kind,
+                               bool as_reference) {
+  ASSERT(writer != NULL);
+  ASSERT(kind == Snapshot::kScript);
+
+  // Write out the serialization header value for this object.
+  writer->WriteInlinedObjectHeader(object_id);
+
+  // Write out the class and tags information.
+  writer->WriteVMIsolateObject(kSignatureDataCid);
+  writer->WriteTags(writer->GetObjectTags(this));
+
+  // Write out all the object pointer fields.
+  SnapshotWriterVisitor visitor(writer, kAsInlinedObject);
+  visitor.VisitPointers(from(), to());
+}
+
+
 RawRedirectionData* RedirectionData::ReadFrom(SnapshotReader* reader,
                                               intptr_t object_id,
                                               intptr_t tags,
                                               Snapshot::Kind kind,
                                               bool as_reference) {
   ASSERT(reader != NULL);
   ASSERT(kind == Snapshot::kScript);
 
   // Allocate redirection data object.
   RedirectionData& data =
@@ skipping 2363 matching lines @@
     // We do not allow objects with native fields in an isolate message.
     writer->SetWriteException(Exceptions::kArgument,
                               "Illegal argument in isolate message"
                               " : (object is a UserTag)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart