Minor cleanups to use null_array(), null_object() and null_string() handles.

runtime/vm/dart_entry.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/dart_entry.h"
 
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/object_store.h"
 #include "vm/resolver.h"
@@ skipping 218 matching lines @@
       previous_pos ^= descriptor.At(previous_index + kPositionOffset);
       descriptor.SetAt(insert_index + kNameOffset, previous_name);
       descriptor.SetAt(insert_index + kPositionOffset, previous_pos);
       insert_index = previous_index;
     }
     // Insert pair in descriptor array.
     descriptor.SetAt(insert_index + kNameOffset, name);
     descriptor.SetAt(insert_index + kPositionOffset, pos);
   }
   // Set terminating null.
-  descriptor.SetAt(descriptor_len - 1, Object::Handle());
+  descriptor.SetAt(descriptor_len - 1, Object::null_object());
 
   // Share the immutable descriptor when possible by canonicalizing it.
   descriptor.MakeImmutable();
   descriptor ^= descriptor.CheckAndCanonicalize(NULL);
   ASSERT(!descriptor.IsNull());
   return descriptor.raw();
 }
 
 
 RawArray* ArgumentsDescriptor::New(intptr_t num_arguments) {
@@ skipping 14 matching lines @@
   Array& descriptor = Array::Handle(Array::New(descriptor_len, Heap::kOld));
   const Smi& arg_count = Smi::Handle(Smi::New(num_arguments));
 
   // Set total number of passed arguments.
   descriptor.SetAt(kCountIndex, arg_count);
 
   // Set number of positional arguments.
   descriptor.SetAt(kPositionalCountIndex, arg_count);
 
   // Set terminating null.
-  descriptor.SetAt((descriptor_len - 1), Object::Handle());
+  descriptor.SetAt((descriptor_len - 1), Object::null_object());
 
   // Share the immutable descriptor when possible by canonicalizing it.
   descriptor.MakeImmutable();
   if (canonicalize) {
     descriptor ^= descriptor.CheckAndCanonicalize(NULL);
   }
   ASSERT(!descriptor.IsNull());
   return descriptor.raw();
 }
 
@@ skipping 192 matching lines @@
           String::Handle(Field::GetterName(Symbols::_id()))));
   const Function& func = Function::Handle(cls.LookupDynamicFunction(func_name));
   ASSERT(!func.IsNull());
   const Array& args = Array::Handle(Array::New(1));
   args.SetAt(0, port);
   return DartEntry::InvokeFunction(func, args);
 }
 
 
 }  // namespace dart