Implement deferred constant support

runtime/vm/ast.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/ast.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object_store.h"
 #include "vm/resolver.h"
@@ skipping 400 matching lines @@
 
 bool ClosureNode::IsPotentiallyConst() const {
   if (function().IsImplicitStaticClosureFunction()) {
     return true;
   }
   return false;
 }
 
 
 const Instance* ClosureNode::EvalConstExpr() const {
-  if (function().IsImplicitStaticClosureFunction()) {
+  if (!is_deferred_reference_ &&
+      function().IsImplicitStaticClosureFunction()) {
     // Return a value that represents an instance. Only the type is relevant.
     return &Instance::Handle();
   }
   return NULL;
 }
 
 
 AstNode* ClosureNode::MakeAssignmentNode(AstNode* rhs) {
   if (scope() == NULL) {
     // This is an implicit closure node created because a static getter was not
@@ skipping 123 matching lines @@
   const String& func_name = String::Handle(function().name());
   if (cls_name.Equals(Symbols::NoSuchMethodError()) &&
       func_name.StartsWith(Symbols::ThrowNew())) {
     return this;
   }
   return NULL;
 }
 
 
 bool StaticGetterNode::IsPotentiallyConst() const {
+  if (is_deferred_reference_) {
+    return false;
+  }
   const String& getter_name =
       String::Handle(Field::GetterName(this->field_name()));
   const Function& getter_func =
       Function::Handle(this->cls().LookupStaticFunction(getter_name));
   if (getter_func.IsNull() || !getter_func.is_const()) {
     return false;
   }
   return true;
 }
 
 
 const Instance* StaticGetterNode::EvalConstExpr() const {
+  if (is_deferred_reference_) {
+    return NULL;
+  }
   const String& getter_name =
       String::Handle(Field::GetterName(this->field_name()));
   const Function& getter_func =
       Function::Handle(this->cls().LookupStaticFunction(getter_name));
   if (getter_func.IsNull() || !getter_func.is_const()) {
     return NULL;
   }
   const Object& result = Object::Handle(
       DartEntry::InvokeFunction(getter_func, Object::empty_array()));
   if (result.IsError() || result.IsNull()) {
     // TODO(turnidge): We could get better error messages by returning
     // the Error object directly to the parser.  This will involve
     // replumbing all of the EvalConstExpr methods.
     return NULL;
   }
   return &Instance::ZoneHandle(Instance::Cast(result).raw());
 }
 
 }  // namespace dart