More compact string representation on 64 bit.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 21338 matching lines @@
   if (len < 0 || len > kMaxElements) {
     // This should be caught before we reach here.
     FATAL1("Fatal error in OneByteString::New: invalid len %" Pd "\n", len);
   }
   {
     RawObject* raw = Object::Allocate(OneByteString::kClassId,
                                       OneByteString::InstanceSize(len), space);
     NoSafepointScope no_safepoint;
     RawOneByteString* result = reinterpret_cast<RawOneByteString*>(raw);
     result->StoreSmi(&(result->ptr()->length_), Smi::New(len));
+#if !defined(HASH_IN_OBJECT_HEADER)
     result->StoreSmi(&(result->ptr()->hash_), Smi::New(0));
+#endif
     return result;
   }
 }
 
 
 RawOneByteString* OneByteString::New(const uint8_t* characters,
                                      intptr_t len,
                                      Heap::Space space) {
   const String& result = String::Handle(OneByteString::New(len, space));
   if (len > 0) {
@@ skipping 1981 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart