Serialize metadata

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

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 2282 matching lines @@
       // necessary, but the backend relies on them being resolved.
       enqueuer.enqueueReflectiveStaticFields(_findStaticFieldTargets());
     }
 
     if (mustPreserveNames) reporter.log('Preserving names.');
 
     if (mustRetainMetadata) {
       reporter.log('Retaining metadata.');
 
       compiler.libraryLoader.libraries.forEach(retainMetadataOf);
-
       if (enqueuer.isResolutionQueue) {
         /// Register the constant value of [metadata] as live in resolution.
         void registerMetadataConstant(MetadataAnnotation metadata) {
           ConstantValue constant =
               constants.getConstantValueForMetadata(metadata);
           Dependency dependency =
               new Dependency(constant, metadata.annotatedElement);
           metadataConstants.add(dependency);
           registerCompileTimeConstant(dependency.constant,
               new EagerRegistry('EagerRegistry for ${dependency}', enqueuer));
@@ skipping 29 matching lines @@
         if (element.enclosingClass != null) {
           processElementMetadata(element.enclosingClass);
         } else {
           processLibraryMetadata(element.library);
         }
       }
     }
 
     // TODO(johnniwinther): We should have access to all recently processed
     // elements and process these instead.
-    compiler.enqueuer.resolution.processedElements.forEach(processElementMetadata);
+    compiler.enqueuer.resolution.processedElements
+        .forEach(processElementMetadata);
   }
 
   void onQueueClosed() {
     lookupMapAnalysis.onQueueClosed();
     jsInteropAnalysis.onQueueClosed();
   }
 
   void onCodegenStart() {
     lookupMapAnalysis.onCodegenStart();
   }
@@ skipping 704 matching lines @@
     return transformed;
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
+
+  String toString() => '$annotatedElement:${constant.toStructuredText()}';
 }
 
 class JavaScriptImpactStrategy extends ImpactStrategy {
   final Resolution resolution;
   final DumpInfoTask dumpInfoTask;
   final bool supportDeferredLoad;
   final bool supportDumpInfo;
   final bool supportSerialization;
 
   JavaScriptImpactStrategy(this.resolution, this.dumpInfoTask,
@@ skipping 25 matching lines @@
 
   @override
   void onImpactUsed(ImpactUseCase impactUse) {
     if (impactUse == DeferredLoadTask.IMPACT_USE && !supportSerialization) {
       // TODO(johnniwinther): Allow emptying when serialization has been
       // performed.
       resolution.emptyCache();
     }
   }
 }