dart2js cps: Access to lazily initialized fields.

pkg/compiler/lib/src/js_backend/codegen/codegen.dart

 // Copyright (c) 2014, 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.
 
 library code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../js/js.dart' as js;
@@ skipping 572 matching lines @@
     js.PropertyAccess field =
         new js.PropertyAccess.field(
             visitExpression(node.object),
             glue.instanceFieldPropertyName(node.field));
     return new js.Assignment(field, visitExpression(node.value));
   }
 
   @override
   js.Expression visitGetStatic(tree_ir.GetStatic node) {
     assert(node.element is FieldElement || node.element is FunctionElement);
-    if (node.element is FieldElement) {
-      registry.registerStaticUse(node.element.declaration);
-      return glue.staticFieldAccess(node.element);
-    } else {
+    if (node.element is FunctionElement) {
+      // Tear off a method.
       registry.registerGetOfStaticFunction(node.element.declaration);
       return glue.isolateStaticClosureAccess(node.element);
     }
+    if (glue.isLazilyInitialized(node.element)) {
+      // Read a lazily initialized field.
+      registry.registerStaticUse(node.element.declaration);
+      js.Expression getter = glue.isolateLazyInitializerAccess(node.element);
+      return new js.Call(getter, [], sourceInformation: node.sourceInformation);
+    }
+    // Read an eagerly initialized field.
+    registry.registerStaticUse(node.element.declaration);
+    return glue.staticFieldAccess(node.element);
   }
 
   @override
   js.Expression visitSetStatic(tree_ir.SetStatic node) {
     assert(node.element is FieldElement);
     registry.registerStaticUse(node.element.declaration);
     js.Expression field = glue.staticFieldAccess(node.element);
     js.Expression value = visitExpression(node.value);
     return new js.Assignment(field, value);
   }
@@ skipping 56 matching lines @@
 
   @override
   visitVariableDeclaration(tree_ir.VariableDeclaration node) {
     return errorUnsupportedNode(node);
   }
 
   errorUnsupportedNode(tree_ir.DartSpecificNode node) {
     throw "Unsupported node in JS backend: $node";
   }
 }