Add read only handles for the following predefined symbols

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 1890 matching lines @@
     GET_LIST_ELEMENT(isolate, Array, obj, index);
   } else if (obj.IsGrowableObjectArray()) {
     GET_LIST_ELEMENT(isolate, GrowableObjectArray, obj, index);
   } else if (obj.IsError()) {
     return list;
   } else {
     // Check and handle a dart object that implements the List interface.
     const Instance& instance =
         Instance::Handle(isolate, GetListInstance(isolate, obj));
     if (!instance.IsNull()) {
-      String& name = String::Handle(isolate, Symbols::IndexToken());
-      const Function& function =
-          Function::Handle(isolate,
-                           Resolver::ResolveDynamic(instance, name, 2, 0));
+      const Function& function = Function::Handle(
+          isolate,
+          Resolver::ResolveDynamic(instance,
+                                   Symbols::IndexTokenHandle(),
+                                   2,
+                                   0));
       if (!function.IsNull()) {
         GrowableArray<const Object*> args(1);
         Integer& indexobj = Integer::Handle(isolate);
         indexobj = Integer::New(index);
         args.Add(&indexobj);
         const Array& kNoArgumentNames = Array::Handle(isolate);
         return Api::NewHandle(isolate, DartEntry::InvokeDynamic(
             instance, function, args, kNoArgumentNames));
       }
     }
@@ skipping 28 matching lines @@
     SET_LIST_ELEMENT(isolate, Array, obj, index, value);
   } else if (obj.IsGrowableObjectArray()) {
     SET_LIST_ELEMENT(isolate, GrowableObjectArray, obj, index, value);
   } else if (obj.IsError()) {
     return list;
   } else {
     // Check and handle a dart object that implements the List interface.
     const Instance& instance =
         Instance::Handle(isolate, GetListInstance(isolate, obj));
     if (!instance.IsNull()) {
-      String& name = String::Handle(isolate, Symbols::AssignIndexToken());
-      const Function& function =
-          Function::Handle(isolate,
-                           Resolver::ResolveDynamic(instance, name, 3, 0));
+      const Function& function = Function::Handle(
+          isolate,
+          Resolver::ResolveDynamic(instance,
+                                   Symbols::AssignIndexTokenHandle(),
+                                   3,
+                                   0));
       if (!function.IsNull()) {
         const Integer& index_obj =
             Integer::Handle(isolate, Integer::New(index));
         const Object& value_obj =
             Object::Handle(isolate, Api::UnwrapHandle(value));
         if (!value_obj.IsNull() && !value_obj.IsInstance()) {
           RETURN_TYPE_ERROR(isolate, value, Instance);
         }
         GrowableArray<const Object*> args(2);
         args.Add(&index_obj);
@@ skipping 59 matching lines @@
                               native_array,
                               offset,
                               length);
   } else if (obj.IsError()) {
     return list;
   } else {
     // Check and handle a dart object that implements the List interface.
     const Instance& instance =
         Instance::Handle(isolate, GetListInstance(isolate, obj));
     if (!instance.IsNull()) {
-      String& name = String::Handle(isolate, Symbols::IndexToken());
-      const Function& function =
-          Function::Handle(isolate,
-                           Resolver::ResolveDynamic(instance, name, 2, 0));
+      const Function& function = Function::Handle(
+          isolate,
+          Resolver::ResolveDynamic(instance,
+                                   Symbols::IndexTokenHandle(),
+                                   2,
+                                   0));
       if (!function.IsNull()) {
         Object& result = Object::Handle(isolate);
         Integer& intobj = Integer::Handle(isolate);
         for (int i = 0; i < length; i++) {
           intobj = Integer::New(offset + i);
           GrowableArray<const Object*> args(1);
           args.Add(&intobj);
           const Array& kNoArgumentNames = Array::Handle(isolate);
           result = DartEntry::InvokeDynamic(
               instance, function, args, kNoArgumentNames);
@@ skipping 65 matching lines @@
                               native_array,
                               offset,
                               length);
   } else if (obj.IsError()) {
     return list;
   } else {
   // Check and handle a dart object that implements the List interface.
     const Instance& instance =
         Instance::Handle(isolate, GetListInstance(isolate, obj));
     if (!instance.IsNull()) {
-      String& name = String::Handle(isolate, Symbols::AssignIndexToken());
-      const Function& function =
-          Function::Handle(isolate,
-                           Resolver::ResolveDynamic(instance, name, 3, 0));
+      const Function& function = Function::Handle(
+          isolate,
+          Resolver::ResolveDynamic(instance,
+                                   Symbols::AssignIndexTokenHandle(),
+                                   3,
+                                   0));
       if (!function.IsNull()) {
         Integer& indexobj = Integer::Handle(isolate);
         Integer& valueobj = Integer::Handle(isolate);
         for (int i = 0; i < length; i++) {
           indexobj = Integer::New(offset + i);
           valueobj = Integer::New(native_array[i]);
           GrowableArray<const Object*> args(2);
           args.Add(&indexobj);
           args.Add(&valueobj);
           const Array& kNoArgumentNames = Array::Handle(isolate);
@@ skipping 2308 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart