Do not try to serialize VM objects, these are read only canonical objects and should be referred to…

vm/symbols.cc

Index: vm/symbols.cc
===================================================================
--- vm/symbols.cc	(revision 10306)
+++ vm/symbols.cc	(working copy)
@@ -17,7 +17,6 @@
 
 // Turn off population of symbols in the VM symbol table, so that we
 // don't find these symbols while doing a Symbols::New(...).
-#if 0
 static const char* names[] = {
   NULL,
 
@@ -26,7 +25,6 @@
 PREDEFINED_SYMBOLS_LIST(DEFINE_SYMBOL_LITERAL)
 #undef DEFINE_SYMBOL_LITERAL
 };
-#endif
 
 
 void Symbols::InitOnce(Isolate* isolate) {
@@ -38,7 +36,6 @@
 
   // Turn off population of symbols in the VM symbol table, so that we
   // don't find these symbols while doing a Symbols::New(...).
-#if 0
   // Create all predefined symbols.
   ASSERT((sizeof(names) / sizeof(const char*)) == kMaxPredefined);
   const Array& symbol_table =
@@ -50,7 +47,6 @@
     Add(symbol_table, str);
     predefined_[i] = str.raw();
   }
-#endif
 }
 
 
@@ -297,4 +293,21 @@
   return index;  // Index of symbol if found or slot into which to add symbol.
 }
 
+
+intptr_t Symbols::LookupVMSymbol(RawObject* obj) {
+  for (intptr_t i = 1;  i < kMaxPredefined; i++) {
+    if (predefined_[i] == obj) {
+      return (i + Object::kMaxId);
+    }
+  }
+  return Object::kInvalidIndex;
+}
+
+
+RawObject* Symbols::GetVMSymbol(intptr_t object_id) {
+  ASSERT(IsVMSymbolId(object_id));
+  intptr_t i = (object_id - Object::kMaxId);
+  return (i > 0 && i < kMaxPredefined) ? predefined_[i] : Object::null();
+}
+
 }  // namespace dart