Implement external strings.

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 1095 matching lines @@
   StringWriteTo(writer,
                 object_id,
                 ObjectStore::kFourByteStringClass,
                 serialize_classes,
                 ptr()->length_,
                 ptr()->hash_,
                 ptr()->data_);
 }
 
 
+RawExternalOneByteString* ExternalOneByteString::ReadFrom(
+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalOneByteString::null();
+}
+
+
+RawExternalTwoByteString* ExternalTwoByteString::ReadFrom(
+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalTwoByteString::null();
+}
+
+
+RawExternalFourByteString* ExternalFourByteString::ReadFrom(
+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalFourByteString::null();
+}
+
+
+void RawExternalOneByteString::WriteTo(SnapshotWriter* writer,
+                                       intptr_t object_id,
+                                       bool serialize_classes) {
+  // Serialize as a non-external one byte string.
+  StringWriteTo(writer,
+                object_id,
+                ObjectStore::kOneByteStringClass,
+                serialize_classes,
+                ptr()->length_,
+                ptr()->hash_,
+                ptr()->external_data_->data_);
+}
+
+
+void RawExternalTwoByteString::WriteTo(SnapshotWriter* writer,
+                                       intptr_t object_id,
+                                       bool serialize_classes) {
+  // Serialize as a non-external two byte string.
+  StringWriteTo(writer,
+                object_id,
+                ObjectStore::kTwoByteStringClass,
+                serialize_classes,
+                ptr()->length_,
+                ptr()->hash_,
+                ptr()->external_data_->data_);
+}
+
+
+void RawExternalFourByteString::WriteTo(SnapshotWriter* writer,
+                                        intptr_t object_id,
+                                        bool serialize_classes) {
+  // Serialize as a non-external four byte string.
+  StringWriteTo(writer,
+                object_id,
+                ObjectStore::kFourByteStringClass,
+                serialize_classes,
+                ptr()->length_,
+                ptr()->hash_,
+                ptr()->external_data_->data_);
+}
+
+
 RawBool* Bool::ReadFrom(SnapshotReader* reader,
                           intptr_t object_id,
                           bool classes_serialized) {
   UNREACHABLE();
   return Bool::null();
 }
 
 
 void RawBool::WriteTo(SnapshotWriter* writer,
                       intptr_t object_id,
@@ skipping 190 matching lines @@
   // Write out all the other fields.
   writer->Write<RawObject*>(ptr()->num_bracket_expressions_);
   writer->WriteObject(ptr()->pattern_);
   writer->Write<intptr_t>(ptr()->type_);
   writer->Write<intptr_t>(ptr()->flags_);
 
   // Do not write out the data part which is native.
 }
 
 }  // namespace dart