Evaluate compile-time constants of metadata.

dart/lib/compiler/implementation/elements/elements.dart

Index: dart/lib/compiler/implementation/elements/elements.dart
diff --git a/dart/lib/compiler/implementation/elements/elements.dart b/dart/lib/compiler/implementation/elements/elements.dart
index 2cfa90d06652a110c01bd578db777c881f3c13b1..a8d2fc8cb3dce86ffcc5fb24040b6d5cd99ad10c 100644
--- a/dart/lib/compiler/implementation/elements/elements.dart
+++ b/dart/lib/compiler/implementation/elements/elements.dart
@@ -123,6 +123,8 @@ class Element implements Hashable {
   }
 
   void addMetadata(MetadataAnnotation annotation) {
+    assert(annotation.annotatedElement === null);
+    annotation.annotatedElement = this;
     metadata = metadata.prepend(annotation);
   }
 
@@ -1599,6 +1601,19 @@ class MetadataAnnotation {
    * In the mirror system, this would be an object mirror.
    */
   abstract Constant get value();
+  Element annotatedElement;
+  int resolutionState;
+
+  MetadataAnnotation([this.resolutionState = ClassElement.STATE_NOT_STARTED]);

[ngeoffray, 2012/08/22 21:57:54]

Should these constant values be on some other place than ClassElement?

[ahe, 2012/08/23 05:43:34]

Done.

+
+  abstract Node parseNode(DiagnosticListener listener);
+
+  MetadataAnnotation ensureResolved(Compiler compiler) {
+    if (resolutionState == ClassElement.STATE_NOT_STARTED) {
+      compiler.resolver.resolveMetadataAnnotation(this);
+    }
+    return this;
+  }
 
-  // TODO(ahe): Add more functionality as needed.
+  String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }