Support compilation of Hello World

pkg/compiler/lib/src/deferred_load.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 deferred_load;
 
 import 'common/backend_api.dart' show Backend;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
+import 'constants/expressions.dart'
+    show
+        ConstantExpression,
+        ConstantExpressionKind;
 import 'constants/values.dart'
     show
         ConstantValue,
         ConstructedConstantValue,
         DeferredConstantValue,
         StringConstantValue;
 import 'dart_types.dart';
 import 'elements/elements.dart'
     show
         AccessorElement,
@@ skipping 306 matching lines @@
             }),
             IMPACT_USE);
 
         if (analyzableElement.resolvedAst.kind != ResolvedAstKind.PARSED) {
           return;
         }
 
         TreeElements treeElements = analyzableElement.resolvedAst.elements;
         assert(treeElements != null);
 
-        treeElements.forEachConstantNode((Node node, _) {
+        treeElements.forEachConstantNode(
+            (Node node, ConstantExpression expression) {
           // Explicitly depend on the backend constants.
-          ConstantValue value =
-              backend.constants.getConstantValueForNode(node, treeElements);
-          if (value != null) {
-            // TODO(johnniwinther): Assert that all constants have values when
-            // these are directly evaluated.
-            constants.add(value);
-          }
+          ConstantValue value = backend.constants.getConstantValue(expression);
+          assert(invariant(node, value != null,
+              message: "No constant value for ${expression.toStructuredText()}."));
+          constants.add(value);
         });
       }
     }
 
     // TODO(sigurdm): How is metadata on a patch-class handled?
     for (MetadataAnnotation metadata in element.metadata) {
       ConstantValue constant =
           backend.constants.getConstantValueForMetadata(metadata);
       if (constant != null) {
         constants.add(constant);
@@ skipping 626 matching lines @@
     return result;
   }
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 }