Create ResolutionEnqueuer after library loading.

pkg/compiler/tool/perf.dart

 // 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.
 
 /// An entrypoint used to run portions of dart2js and measure its performance.
 library compiler.tool.perf;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/apiimpl.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 import 'package:compiler/src/diagnostics/messages.dart'
     show Message, MessageTemplate;
+import 'package:compiler/src/enqueue.dart' show ResolutionEnqueuer;
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/options.dart';
 import 'package:compiler/src/parser/element_listener.dart' show ScannerOptions;
 import 'package:compiler/src/parser/node_listener.dart' show NodeListener;
 import 'package:compiler/src/parser/diet_parser_task.dart' show PartialParser;
 import 'package:compiler/src/platform_configuration.dart' as platform;
 import 'package:compiler/src/source_file_provider.dart';
 import 'package:compiler/src/universe/world_impact.dart' show WorldImpact;
 import 'package:front_end/src/fasta/parser.dart' show Listener, Parser;
 import 'package:front_end/src/fasta/scanner.dart' show Token, scan;
@@ skipping 310 matching lines @@
 
 // We subclass compiler to skip phases and stop after creating kernel.
 class MyCompiler extends CompilerImpl {
   MyCompiler(CompilerInput provider, CompilerDiagnostics handler,
       CompilerOptions options)
       : super(provider, null, handler, options) {}
 
   /// Performs the compilation when all libraries have been loaded.
   void compileLoadedLibraries() =>
       selfTask.measureSubtask('KernelCompiler.compileLoadedLibraries', () {
+        ResolutionEnqueuer resolutionEnqueuer = startResolution();
         WorldImpact mainImpact = computeMain();
         mirrorUsageAnalyzerTask.analyzeUsage(mainApp);
 
         deferredLoadTask.beforeResolution(this);
         impactStrategy = backend.createImpactStrategy(
             supportDeferredLoad: deferredLoadTask.isProgramSplit,
             supportDumpInfo: options.dumpInfo,
             supportSerialization: serialization.supportSerialization);
 
         phase = Compiler.PHASE_RESOLVING;
-        enqueuer.resolution.applyImpact(mainImpact);
+        resolutionEnqueuer.applyImpact(mainImpact);
         // Note: we enqueue everything in the program so we measure generating
         // kernel for the entire code, not just what's reachable from main.
         libraryLoader.libraries.forEach((LibraryElement library) {
-          enqueuer.resolution.applyImpact(computeImpactForLibrary(library));
+          resolutionEnqueuer.applyImpact(computeImpactForLibrary(library));
         });
 
         if (deferredLoadTask.isProgramSplit) {
-          enqueuer.resolution
+          resolutionEnqueuer
               .applyImpact(backend.computeDeferredLoadingImpact());
         }
         resolveLibraryMetadata();
         reporter.log('Resolving...');
-        processQueue(enqueuer.resolution, mainFunction, libraryLoader.libraries);
-        enqueuer.resolution.logSummary(reporter.log);
+        processQueue(resolutionEnqueuer, mainFunction, libraryLoader.libraries);
+        resolutionEnqueuer.logSummary(reporter.log);
 
         (reporter as CompilerDiagnosticReporter)
             .reportSuppressedMessagesSummary();
 
         if (compilationFailed) {
           // TODO(sigmund): more diagnostics?
           print('compilation failed!');
           exit(1);
         }
 
         closeResolution();
         var program = (backend as dynamic).kernelTask.program;
         print('total libraries: ${program.libraries.length}');
       });
 }