- Create frame work for adding read only handles for symbols in the VM isolate

vm/dart_api_impl.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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 2727 matching lines @@
 
     // Case 3.  Lookup the funciton with the getter prefix prepended.
     if (func.IsNull()) {
       tmp_name = Field::GetterName(func_name);
       func = cls.LookupFunction(tmp_name);
     }
 
     // Case 4.  Lookup the function with a . appended to find the
     // unnamed constructor.
     if (func.IsNull()) {
-      const String& dot = String::Handle(Symbols::Dot());
-      tmp_name = String::Concat(func_name, dot);
+      tmp_name = String::Concat(func_name, Symbols::DotHandle());
       func = cls.LookupFunction(tmp_name);
     }
   } else if (obj.IsLibrary()) {
     const Library& lib = Library::Cast(obj);
 
     // Case 1.  Lookup the unmodified function name.
     func = lib.LookupFunctionAllowPrivate(func_name);
 
     // Case 2.  Lookup the function without the external setter suffix
     // '='.  Make sure to do this check after the regular lookup, so
@@ skipping 546 matching lines @@
   String& base_constructor_name = String::Handle();
   base_constructor_name = cls.Name();
 
   // And get the name of the constructor to invoke.
   String& dot_name = String::Handle(isolate);
   const Object& name_obj =
       Object::Handle(isolate, Api::UnwrapHandle(constructor_name));
   if (name_obj.IsNull()) {
     dot_name = Symbols::Dot();
   } else if (name_obj.IsString()) {
-    const String& dot = String::Handle(isolate, Symbols::Dot());
-    dot_name = String::Concat(dot, String::Cast(name_obj));
+    dot_name = String::Concat(Symbols::DotHandle(), String::Cast(name_obj));
   } else {
     RETURN_TYPE_ERROR(isolate, constructor_name, String);
   }
   const char* msg = CheckIsolateState(isolate);
   if (msg != NULL) {
     return Api::NewError("%s", msg);
   }
 
   // Resolve the constructor.
   result = ResolveConstructor(
@@ skipping 1131 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart