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 1116 matching lines @@
   // Write out the hash field.
   writer->Write<RawObject*>(ptr()->hash_);
 
   // Write out the string.
   for (intptr_t i = 0; i < len; i++) {
     writer->Write<uint32_t>(ptr()->data_[i]);
   }
 }
 
 
+RawExternalOneByteString* ExternalOneByteString::ReadFrom(

[Anton Muhin, 2011/10/25 10:19:02]

should we allow to serialize externalized strings?  it might be difficult to
reattach a finalizer callback.

[cshapiro, 2011/10/25 20:42:47]

No, we should not.  What this code does is serialize an external string as an
ordinary dart string of the equivalent character width.  This prevents external
strings from appearing in the snapshot.

+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalOneByteString::null();
+}
+
+
+void RawExternalOneByteString::WriteTo(SnapshotWriter* writer,
+                                       intptr_t object_id,
+                                       bool serialize_classes) {
+  ASSERT(writer != NULL);
+  intptr_t len = Smi::Value(ptr()->length_);
+
+  // Write out the serialization header value for this object.
+  writer->WriteObjectHeader(kInlined, object_id);
+
+  // Write out the class information.
+  writer->WriteObjectHeader(kObjectId, ObjectStore::kOneByteStringClass);
+
+  // Write out the length field.
+  writer->Write<RawObject*>(ptr()->length_);
+
+  // Write out the hash field.
+  writer->Write<RawObject*>(ptr()->hash_);
+
+  // Write out the string.
+  for (int i = 0; i < len; i++) {
+    writer->Write<uint8_t>(ptr()->data_[i]);
+  }
+}
+
+
+RawExternalTwoByteString* ExternalTwoByteString::ReadFrom(
+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalTwoByteString::null();
+}
+
+
+void RawExternalTwoByteString::WriteTo(SnapshotWriter* writer,
+                                       intptr_t object_id,
+                                       bool serialize_classes) {
+  ASSERT(writer != NULL);
+  intptr_t len = Smi::Value(ptr()->length_);
+
+  // Write out the serialization header value for this object.
+  writer->WriteObjectHeader(kInlined, object_id);
+
+  // Write out the class information.
+  writer->WriteObjectHeader(kObjectId, ObjectStore::kTwoByteStringClass);
+
+  // Write out the length field.
+  writer->Write<RawObject*>(ptr()->length_);
+
+  // Write out the hash field.
+  writer->Write<RawObject*>(ptr()->hash_);
+
+  // Write out the string.
+  for (int i = 0; i < len; i++) {
+    writer->Write<uint16_t>(ptr()->data_[i]);
+  }
+}
+
+
+RawExternalFourByteString* ExternalFourByteString::ReadFrom(
+    SnapshotReader* reader,
+    intptr_t object_id,
+    bool classes_serialized) {
+  UNREACHABLE();
+  return ExternalFourByteString::null();
+}
+
+
+void RawExternalFourByteString::WriteTo(SnapshotWriter* writer,
+                                        intptr_t object_id,
+                                        bool serialize_classes) {
+  ASSERT(writer != NULL);
+  intptr_t len = Smi::Value(ptr()->length_);
+
+  // Write out the serialization header value for this object.
+  writer->WriteObjectHeader(kInlined, object_id);
+
+  // Write out the class information.
+  writer->WriteObjectHeader(kObjectId, ObjectStore::kFourByteStringClass);
+
+  // Write out the length field.
+  writer->Write<RawObject*>(ptr()->length_);
+
+  // Write out the hash field.
+  writer->Write<RawObject*>(ptr()->hash_);
+
+  // Write out the string.
+  for (int i = 0; i < len; i++) {
+    writer->Write<uint32_t>(ptr()->data_[i]);
+  }
+}
+
+
 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 175 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