Lazily format LanguageError messages (fix issue 15069).

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/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
@@ skipping 1545 matching lines @@
   ASSERT(reader != NULL);
 
   // Allocate LanguageError object.
   LanguageError& language_error =
       LanguageError::ZoneHandle(reader->isolate(), NEW_OBJECT(LanguageError));
   reader->AddBackRef(object_id, &language_error, kIsDeserialized);
 
   // Set the object tags.
   language_error.set_tags(tags);
 
+  // Set all non object fields.
+  language_error.set_token_pos(reader->ReadIntptrValue());
+  language_error.set_kind(reader->Read<uint8_t>());
+
   // Set all the object fields.
   // TODO(5411462): Need to assert No GC can happen here, even though
   // allocations may happen.
   intptr_t num_flds =
       (language_error.raw()->to() - language_error.raw()->from());
   for (intptr_t i = 0; i <= num_flds; i++) {
     (*reader->ObjectHandle()) = reader->ReadObjectRef();
     language_error.StorePointer((language_error.raw()->from() + i),
                                 reader->ObjectHandle()->raw());
   }
 
   return language_error.raw();
 }
 
 
 void RawLanguageError::WriteTo(SnapshotWriter* writer,
                                intptr_t object_id,
                                Snapshot::Kind kind) {
   ASSERT(writer != NULL);
 
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
 
   // Write out the class and tags information.
   writer->WriteVMIsolateObject(kLanguageErrorCid);
   writer->WriteIntptrValue(writer->GetObjectTags(this));
 
+  // Write out all the non object fields.
+  writer->WriteIntptrValue(ptr()->token_pos_);
+  writer->Write<uint8_t>(ptr()->kind_);
+
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer);
   visitor.VisitPointers(from(), to());
 }
 
 
 RawUnhandledException* UnhandledException::ReadFrom(SnapshotReader* reader,
                                                     intptr_t object_id,
                                                     intptr_t tags,
                                                     Snapshot::Kind kind) {
@@ skipping 1055 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 MirrorReference)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart