Serialize only unserialized libraries on --resolve-only

pkg/compiler/lib/src/compiler.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.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show EventSink, Future;
 
 import '../compiler_new.dart' as api;
 import 'cache_strategy.dart' show CacheStrategy;
@@ skipping 792 matching lines @@
         // compile-time constants that are metadata.  This means adding
         // something to the resolution queue.  So we cannot wait with
         // this until after the resolution queue is processed.
         deferredLoadTask.beforeResolution(this);
         impactStrategy = backend.createImpactStrategy(
             supportDeferredLoad: deferredLoadTask.isProgramSplit,
             supportDumpInfo: options.dumpInfo,
             supportSerialization: serialization.supportSerialization);
 
         phase = PHASE_RESOLVING;
-        if (analyzeAll) {
+        if (options.resolveOnly) {
+          libraryLoader.libraries.where((LibraryElement library) {
+            return !serialization.isDeserialized(library);
+          }).forEach((LibraryElement library) {
+            reporter.log('Enqueuing ${library.canonicalUri}');
+            fullyEnqueueLibrary(library, enqueuer.resolution);
+          });
+        } else if (analyzeAll) {
           libraryLoader.libraries.forEach((LibraryElement library) {
             reporter.log('Enqueuing ${library.canonicalUri}');
             fullyEnqueueLibrary(library, enqueuer.resolution);
           });
         } else if (options.analyzeMain) {
           if (mainApp != null) {
             fullyEnqueueLibrary(mainApp, enqueuer.resolution);
           }
           if (librariesToAnalyzeWhenRun != null) {
             for (Uri libraryUri in librariesToAnalyzeWhenRun) {
@@ skipping 15 matching lines @@
         if (compilationFailed) {
           if (!options.generateCodeWithCompileTimeErrors) return;
           if (!backend
               .enableCodegenWithErrorsIfSupported(NO_LOCATION_SPANNABLE)) {
             return;
           }
         }
 
         if (options.resolveOnly) {
           reporter.log('Serializing to ${options.resolutionOutput}');
-          serialization.serializeToSink(
-              userOutputProvider.createEventSink('', 'data'),
-              libraryLoader.libraries);
+          serialization
+              .serializeToSink(userOutputProvider.createEventSink('', 'data'),
+                  libraryLoader.libraries.where((LibraryElement library) {
+            return !serialization.isDeserialized(library);
+          }));
         }
         if (options.analyzeOnly) {
           if (!analyzeAll && !compilationFailed) {
             // No point in reporting unused code when [analyzeAll] is true: all
             // code is artificially used.
             // If compilation failed, it is possible that the error prevents the
             // compiler from analyzing all the code.
             // TODO(johnniwinther): Reenable this when the reporting is more
             // precise.
             //reportUnusedCode();
@@ skipping 1242 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }