Test ResolutionImpact equivalence.

tests/compiler/dart2js/serialization_helper.dart

Index: tests/compiler/dart2js/serialization_helper.dart
diff --git a/tests/compiler/dart2js/serialization_helper.dart b/tests/compiler/dart2js/serialization_helper.dart
new file mode 100644
index 0000000000000000000000000000000000000000..a8f95a6bcc9ccd319242a81df19491f8209b3d21
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+++ b/tests/compiler/dart2js/serialization_helper.dart
@@ -0,0 +1,128 @@
+// Copyright (c) 2016, 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 dart2js.serialization_helper;
+
+import 'dart:async';
+import 'package:async_helper/async_helper.dart';
+import 'package:expect/expect.dart';
+import 'package:compiler/src/commandline_options.dart';
+import 'package:compiler/src/common/backend_api.dart';
+import 'package:compiler/src/common/names.dart';
+import 'package:compiler/src/common/resolution.dart';
+import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/filenames.dart';
+import 'package:compiler/src/serialization/element_serialization.dart';
+import 'package:compiler/src/serialization/impact_serialization.dart';
+import 'package:compiler/src/serialization/json_serializer.dart';
+import 'package:compiler/src/serialization/serialization.dart';
+import 'package:compiler/src/serialization/task.dart';
+import 'package:compiler/src/universe/world_impact.dart';
+import 'memory_compiler.dart';
+
+
+Future<String> serializeDartCore() async {
+  Compiler compiler = compilerFor(
+      options: [Flags.analyzeAll]);
+  compiler.serialization.supportSerialization = true;
+  await compiler.run(Uris.dart_core);
+  return serialize(compiler, compiler.libraryLoader.libraries)
+      .toText(const JsonSerializationEncoder());
+}
+
+Serializer serialize(Compiler compiler, Iterable<LibraryElement> libraries) {
+  assert(compiler.serialization.supportSerialization);
+
+  Serializer serializer = new Serializer();
+  serializer.plugins.add(compiler.backend.serialization.serializer);
+  serializer.plugins.add(new ResolutionImpactSerializer(compiler.resolution));
+
+  for (LibraryElement library in libraries) {
+    serializer.serialize(library);
+  }
+  return serializer;
+}
+
+void deserialize(Compiler compiler, String serializedData) {
+  Deserializer deserializer = new Deserializer.fromText(
+      new DeserializationContext(),
+      serializedData,
+      const JsonSerializationDecoder());
+  deserializer.plugins.add(compiler.backend.serialization.deserializer);
+  compiler.serialization.deserializer =
+      new _DeserializerSystem(
+          deserializer,
+          compiler.backend.impactTransformer);
+}
+
+
+const String WORLD_IMPACT_TAG = 'worldImpact';
+
+class ResolutionImpactSerializer extends SerializerPlugin {
+  final Resolution resolution;
+
+  ResolutionImpactSerializer(this.resolution);
+
+  @override
+  void onElement(Element element, ObjectEncoder createEncoder(String tag)) {
+    if (resolution.hasBeenResolved(element)) {
+      ResolutionImpact impact = resolution.getResolutionImpact(element);
+      ObjectEncoder encoder = createEncoder(WORLD_IMPACT_TAG);
+      new ImpactSerializer(encoder).serialize(impact);
+    }
+  }
+}
+
+class ResolutionImpactDeserializer extends DeserializerPlugin {
+  Map<Element, ResolutionImpact> impactMap = <Element, ResolutionImpact>{};
+
+  @override
+  void onElement(Element element, ObjectDecoder getDecoder(String tag)) {
+    ObjectDecoder decoder = getDecoder(WORLD_IMPACT_TAG);
+    if (decoder != null) {
+      impactMap[element] = ImpactDeserializer.deserializeImpact(decoder);
+    }
+  }
+}
+
+class _DeserializerSystem extends DeserializerSystem {
+  final Deserializer _deserializer;
+  final List<LibraryElement> deserializedLibraries = <LibraryElement>[];
+  final ResolutionImpactDeserializer _resolutionImpactDeserializer =
+      new ResolutionImpactDeserializer();
+  final ImpactTransformer _impactTransformer;
+
+  _DeserializerSystem(this._deserializer, this._impactTransformer) {
+    _deserializer.plugins.add(_resolutionImpactDeserializer);
+  }
+
+  LibraryElement readLibrary(Uri resolvedUri) {
+    LibraryElement library = _deserializer.lookupLibrary(resolvedUri);
+    if (library != null) {
+      deserializedLibraries.add(library);
+    }
+    return library;
+  }
+
+  ResolutionImpact getResolutionImpact(Element element) {
+    return _resolutionImpactDeserializer.impactMap[element];
+  }
+
+  @override
+  WorldImpact computeWorldImpact(Element element) {
+    ResolutionImpact resolutionImpact = getResolutionImpact(element);
+    if (resolutionImpact == null) {
+      print('No impact found for $element (${element.library})');
+      return const WorldImpact();
+    } else {
+      return _impactTransformer.transformResolutionImpact(resolutionImpact);
+    }
+  }
+
+  @override
+  bool isDeserialized(Element element) {
+    return deserializedLibraries.contains(element.library);
+  }
+}