Support (de)serialization from command-line

pkg/compiler/lib/src/serialization/task.dart

 // Copyright (c) 2015, 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.task;
 
-import 'dart:async' show Future;
+import 'dart:async' show EventSink, Future;
 import '../common/resolution.dart' show ResolutionImpact, ResolutionWorkItem;
 import '../common/tasks.dart' show CompilerTask;
 import '../common/work.dart' show ItemCompilationContext;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../enqueue.dart' show ResolutionEnqueuer;
 import '../universe/world_impact.dart' show WorldImpact;
+import 'json_serializer.dart';
+import 'serialization.dart';
+import 'system.dart';
 
 /// A deserializer that can load a library element by reading it's information
 /// from a serialized form.
 abstract class LibraryDeserializer {
   /// Loads the [LibraryElement] associated with a library under [uri], or null
   /// if no serialized information is available for the given library.
   Future<LibraryElement> readLibrary(Uri uri);
 }
 
 /// Task that supports deserialization of elements.
 class SerializationTask extends CompilerTask implements LibraryDeserializer {
   SerializationTask(Compiler compiler) : super(compiler);
 
-  DeserializerSystem deserializer;
+  DeserializerSystem system;

[Siggi Cherem (dart-lang), 2016/05/14 01:10:31]

I sort of prefer the old name here.

[Johnni Winther, 2016/05/17 12:37:33]

Done.

 
   String get name => 'Serialization';
 
   /// If `true`, data must be retained to support serialization.
   // TODO(johnniwinther): Make this more precise in terms of what needs to be
   // retained, for instance impacts, resolution data etc.
   bool supportSerialization = false;
 
   /// If `true`, deserialized data is supported.
-  bool get supportsDeserialization => deserializer != null;
+  bool get supportsDeserialization => system != null;
 
   /// Returns the [LibraryElement] for [resolvedUri] if available from
   /// serialization.
   Future<LibraryElement> readLibrary(Uri resolvedUri) {
-    if (deserializer == null) return new Future<LibraryElement>.value();
-    return deserializer.readLibrary(resolvedUri);
+    if (system == null) return new Future<LibraryElement>.value();
+    return system.readLibrary(resolvedUri);
   }
 
   /// Returns `true` if [element] has been deserialized.
   bool isDeserialized(Element element) {
-    return deserializer != null && deserializer.isDeserialized(element);
+    return system != null && system.isDeserialized(element);
   }
 
   bool hasResolutionImpact(Element element) {
-    return deserializer != null && deserializer.hasResolutionImpact(element);
+    return system != null && system.hasResolutionImpact(element);
   }
 
   ResolutionImpact getResolutionImpact(Element element) {
-    return deserializer != null
-        ? deserializer.getResolutionImpact(element)
-        : null;
+    return system != null ? system.getResolutionImpact(element) : null;
   }
 
   /// Creates the [ResolutionWorkItem] for the deserialized [element].
   ResolutionWorkItem createResolutionWorkItem(
       Element element, ItemCompilationContext context) {
-    assert(deserializer != null);
+    assert(system != null);
     assert(isDeserialized(element));
     return new DeserializedResolutionWorkItem(
-        element, context, deserializer.computeWorldImpact(element));
+        element, context, system.computeWorldImpact(element));
   }
 
   bool hasResolvedAst(ExecutableElement element) {
-    return deserializer != null ? deserializer.hasResolvedAst(element) : false;
+    return system != null ? system.hasResolvedAst(element) : false;
   }
 
   ResolvedAst getResolvedAst(ExecutableElement element) {
-    return deserializer != null ? deserializer.getResolvedAst(element) : null;
+    return system != null ? system.getResolvedAst(element) : null;
+  }
+
+  Serializer createSerializer(Iterable<LibraryElement> libraries) {
+    return measure(() {
+      assert(supportSerialization);
+
+      Serializer serializer = new Serializer();
+      SerializerPlugin backendSerializer =
+          compiler.backend.serialization.serializer;
+      serializer.plugins.add(backendSerializer);
+      serializer.plugins.add(new ResolutionImpactSerializer(
+          compiler.resolution, backendSerializer));
+      serializer.plugins.add(new ResolvedAstSerializerPlugin(
+          compiler.resolution, backendSerializer));
+
+      for (LibraryElement library in libraries) {
+        serializer.serialize(library);
+      }
+      return serializer;
+    });
+  }
+
+  void serializeToSink(
+      EventSink<String> sink, Iterable<LibraryElement> libraries) {
+    measure(() {
+      sink
+        ..add(createSerializer(libraries)
+            .toText(const JsonSerializationEncoder()))
+        ..close();
+    });
+  }
+
+  void deserializeFromText(String serializedData) {
+    measure(() {
+      Deserializer deserializer = new Deserializer.fromText(
+          new DeserializationContext(),
+          serializedData,
+          const JsonSerializationDecoder());
+      deserializer.plugins.add(compiler.backend.serialization.deserializer);
+      system = new DeserializerSystemImpl(
+          compiler, deserializer, compiler.backend.impactTransformer);
+    });
   }
 }
 
 /// A [ResolutionWorkItem] for a deserialized element.
 ///
 /// This will not resolve the element but only compute the [WorldImpact].
 class DeserializedResolutionWorkItem implements ResolutionWorkItem {
   final Element element;
   final ItemCompilationContext compilationContext;
   final WorldImpact worldImpact;
@@ skipping 17 matching lines @@
 /// elements.
 abstract class DeserializerSystem {
   Future<LibraryElement> readLibrary(Uri resolvedUri);
   bool isDeserialized(Element element);
   bool hasResolvedAst(ExecutableElement element);
   ResolvedAst getResolvedAst(ExecutableElement element);
   bool hasResolutionImpact(Element element);
   ResolutionImpact getResolutionImpact(Element element);
   WorldImpact computeWorldImpact(Element element);
 }