Create closed world for hello world using .dill file

tests/compiler/dart2js/kernel/closed_world_from_dill_test.dart

+// Copyright (c) 2017, 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.
+
+// Partial test that the closed world computed from [WorldImpact]s derived from
+// kernel is equivalent to the original computed from resolution.
+library dart2js.kernel.closed_world_from_dill_test;
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:async_helper/async_helper.dart';
+import 'package:compiler/src/commandline_options.dart';
+import 'package:compiler/src/common.dart';
+import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/elements/resolution_types.dart';
+import 'package:compiler/src/elements/types.dart';
+import 'package:compiler/src/enqueue.dart';
+import 'package:compiler/src/kernel/element_map.dart';
+import 'package:compiler/src/kernel/kernel_strategy.dart';
+import 'package:compiler/src/resolution/enum_creator.dart';
+import 'package:compiler/src/universe/world_builder.dart';
+import 'package:compiler/src/world.dart';
+import 'package:expect/expect.dart';
+import '../memory_compiler.dart';
+import '../equivalence/check_functions.dart';
+import '../serialization/helper.dart';
+import 'test_helpers.dart';
+
+import 'compiler_helper.dart';
+
+const SOURCE = const {
+  'main.dart': '''
+main() {
+  print('Hello World');
+}
+'''
+};
+
+main(List<String> args) {
+  asyncTest(() async {
+    await mainInternal(args);
+  });
+}
+
+enum ResultKind { crashes, errors, warnings, success, failure }
+
+Future<ResultKind> mainInternal(List<String> args,
+    {bool skipWarnings: false, bool skipErrors: false}) async {
+  Arguments arguments = new Arguments.from(args);
+  Uri entryPoint;
+  Map<String, String> memorySourceFiles;
+  if (arguments.uri != null) {
+    entryPoint = arguments.uri;
+    memorySourceFiles = const <String, String>{};
+  } else {
+    entryPoint = Uri.parse('memory:main.dart');
+    memorySourceFiles = SOURCE;
+  }
+
+  enableDebugMode();
+  EnumCreator.matchKernelRepresentationForTesting = true;
+
+  Directory dir = await Directory.systemTemp.createTemp('dart2js-with-dill');
+  print('--- create temp directory $dir -------------------------------');
+  memorySourceFiles.forEach((String name, String source) {
+    new File.fromUri(dir.uri.resolve(name)).writeAsStringSync(source);
+  });
+  entryPoint = dir.uri.resolve(entryPoint.path);
+
+  print('---- analyze-only ------------------------------------------------');
+  DiagnosticCollector collector = new DiagnosticCollector();
+  Compiler compiler1 = compilerFor(
+      entryPoint: entryPoint,
+      diagnosticHandler: collector,
+      options: [Flags.analyzeOnly, Flags.enableAssertMessage]);
+  ElementResolutionWorldBuilder.useInstantiationMap = true;
+  compiler1.resolution.retainCachesForTesting = true;
+  await compiler1.run(entryPoint);
+  if (collector.crashes.isNotEmpty) {
+    print('Skipping due to crashes.');
+    return ResultKind.crashes;
+  }
+  if (collector.errors.isNotEmpty && skipErrors) {
+    print('Skipping due to errors.');
+    return ResultKind.errors;
+  }
+  if (collector.warnings.isNotEmpty && skipWarnings) {
+    print('Skipping due to warnings.');
+    return ResultKind.warnings;
+  }
+  Expect.isFalse(compiler1.compilationFailed);
+  ResolutionEnqueuer enqueuer1 = compiler1.enqueuer.resolution;
+  ClosedWorld closedWorld1 = compiler1.resolutionWorldBuilder.closeWorld();
+
+  Compiler compiler2 =
+      await compileWithDill(entryPoint, const {}, printSteps: true);
+
+  KernelFrontEndStrategy frontEndStrategy = compiler2.frontEndStrategy;
+  KernelToElementMap elementMap = frontEndStrategy.elementMap;
+
+  Expect.isFalse(compiler2.compilationFailed);
+
+  KernelEquivalence equivalence = new KernelEquivalence(elementMap);
+
+  ResolutionEnqueuer enqueuer2 = compiler2.enqueuer.resolution;
+  ClosedWorld closedWorld2 = compiler2.resolutionWorldBuilder.closeWorld();
+
+  checkBackendUsage(closedWorld1.backendUsage, closedWorld2.backendUsage,
+      equivalence.defaultStrategy);
+
+  checkResolutionEnqueuers(closedWorld1.backendUsage, closedWorld2.backendUsage,
+      enqueuer1, enqueuer2, elementEquivalence: equivalence.entityEquivalence,
+      typeEquivalence: (ResolutionDartType a, DartType b) {
+    return equivalence.typeEquivalence(unalias(a), b);
+  }, elementFilter: elementFilter, verbose: arguments.verbose);
+
+  checkClosedWorlds(closedWorld1, closedWorld2,
+      strategy: equivalence.defaultStrategy, verbose: arguments.verbose);
+
+  return ResultKind.success;
+}