Implement external strings.

runtime/vm/raw_object.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/raw_object.h"
 
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/visitor.h"
 
@@ skipping 437 matching lines @@
 
 
 intptr_t RawFourByteString::VisitFourByteStringPointers(
     RawFourByteString* raw_obj, ObjectPointerVisitor* visitor) {
   intptr_t length = Smi::Value(raw_obj->ptr()->length_);
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return FourByteString::InstanceSize(length);
 }
 
 
+intptr_t RawExternalOneByteString::VisitExternalOneByteStringPointers(
+    RawExternalOneByteString* raw_obj, ObjectPointerVisitor* visitor) {
+  // Make sure that we got here with the tagged pointer as this.
+  ASSERT(raw_obj->IsHeapObject());
+  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
+  return ExternalOneByteString::InstanceSize();
+}
+
+
+intptr_t RawExternalTwoByteString::VisitExternalTwoByteStringPointers(
+    RawExternalTwoByteString* raw_obj, ObjectPointerVisitor* visitor) {
+  // Make sure that we got here with the tagged pointer as this.
+  ASSERT(raw_obj->IsHeapObject());
+  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
+  return ExternalTwoByteString::InstanceSize();
+}
+
+
+intptr_t RawExternalFourByteString::VisitExternalFourByteStringPointers(
+    RawExternalFourByteString* raw_obj, ObjectPointerVisitor* visitor) {
+  // Make sure that we got here with the tagged pointer as this.
+  ASSERT(raw_obj->IsHeapObject());
+  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
+  return ExternalFourByteString::InstanceSize();
+}
+
+
 intptr_t RawBool::VisitBoolPointers(RawBool* raw_obj,
                                     ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   return Bool::InstanceSize();
 }
 
 
 intptr_t RawArray::VisitArrayPointers(RawArray* raw_obj,
                                       ObjectPointerVisitor* visitor) {
@@ skipping 39 matching lines @@
 intptr_t RawJSRegExp::VisitJSRegExpPointers(RawJSRegExp* raw_obj,
                                             ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   intptr_t length = Smi::Value(raw_obj->ptr()->data_length_);
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return JSRegExp::InstanceSize(length);
 }
 
 }  // namespace dart