Introduce the Error object class in the vm. It represents all of the

runtime/vm/raw_object_snapshot.cc

 // Copyright (c) 2011, 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 960 matching lines @@
 
   // Serialize number of variables.
   writer->WriteIntptrValue(ptr()->num_variables_);
 
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer);
   visitor.VisitPointers(from(), to(ptr()->num_variables_));
 }
 
 
+RawError* Error::ReadFrom(SnapshotReader* reader,
+                                intptr_t object_id,
+                                intptr_t tags,
+                                Snapshot::Kind kind) {
+  UNREACHABLE();
+  return Error::null();
+}
+
+
+void RawError::WriteTo(SnapshotWriter* writer,
+                          intptr_t object_id,
+                          Snapshot::Kind kind) {
+  UNREACHABLE();
+}
+
+
+RawApiError* ApiError::ReadFrom(SnapshotReader* reader,
+                                intptr_t object_id,
+                                intptr_t tags,
+                                Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+  return ApiError::null();
+}
+
+
+void RawApiError::WriteTo(SnapshotWriter* writer,
+                          intptr_t object_id,
+                          Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+}
+
+
+RawLanguageError* LanguageError::ReadFrom(SnapshotReader* reader,
+                                          intptr_t object_id,
+                                          intptr_t tags,
+                                          Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+  return LanguageError::null();
+}
+
+
+void RawLanguageError::WriteTo(SnapshotWriter* writer,
+                               intptr_t object_id,
+                               Snapshot::Kind kind) {
+  UNIMPLEMENTED();
+}
+
+
 RawUnhandledException* UnhandledException::ReadFrom(SnapshotReader* reader,
                                                     intptr_t object_id,
                                                     intptr_t tags,
                                                     Snapshot::Kind kind) {
   UNIMPLEMENTED();
   return UnhandledException::null();
 }
 
 
 void RawUnhandledException::WriteTo(SnapshotWriter* writer,
                                     intptr_t object_id,
                                     Snapshot::Kind kind) {
   UNIMPLEMENTED();
 }
 
 
-RawApiError* ApiError::ReadFrom(SnapshotReader* reader,
-                                intptr_t object_id,
-                                intptr_t tags,
-                                Snapshot::Kind kind) {
+RawUnwindError* UnwindError::ReadFrom(SnapshotReader* reader,
+                                      intptr_t object_id,
+                                      intptr_t tags,
+                                      Snapshot::Kind kind) {
   UNIMPLEMENTED();
-  return ApiError::null();
+  return UnwindError::null();
 }
 
 
-void RawApiError::WriteTo(SnapshotWriter* writer,
-                          intptr_t object_id,
-                          Snapshot::Kind kind) {
+void RawUnwindError::WriteTo(SnapshotWriter* writer,
+                             intptr_t object_id,
+                             Snapshot::Kind kind) {
   UNIMPLEMENTED();
 }
 
 
 RawInstance* Instance::ReadFrom(SnapshotReader* reader,
                                 intptr_t object_id,
                                 intptr_t tags,
                                 Snapshot::Kind kind) {
   UNREACHABLE();
   return Instance::null();
@@ skipping 595 matching lines @@
   // Write out all the other fields.
   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