Compute NativeBasicData for KernelWorldBuilder

pkg/compiler/lib/src/kernel/native_basic_data.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.
+
+part of dart2js.kernel.world_builder;
+
+/// Computes that NativeBasicData for the libraries in [worldBuilder].
+// TODO(johnnniwinther): Move this to the AnnotationProcessor when it has been

[Siggi Cherem (dart-lang), 2017/04/21 16:29:39]

update TODO? I'm guessing this function will entirely go away, since the
compiler will create the processor directly and call it like we already do?

Maybe we should move this function to the unit test where we use it?

[Johnni Winther, 2017/04/24 06:50:06]

Done.

+// committed.
+NativeBasicData computeNativeBasicData(KernelWorldBuilder worldBuilder) {
+  NativeBasicDataBuilderImpl builder = new NativeBasicDataBuilderImpl();
+  ElementEnvironment elementEnvironment = worldBuilder.elementEnvironment;
+  for (LibraryEntity library in elementEnvironment.libraries) {
+    /// TODO(johnniwinther): Reuse `JavaScriptBackend.canLibraryUseNative`
+    /// instead.
+    if (library.canonicalUri.scheme == 'dart') {
+      new KernelAnnotationProcessor(worldBuilder)
+          .extractNativeAnnotations(library, builder);
+    }
+  }
+  return builder.close(elementEnvironment);
+}
+
+class KernelAnnotationProcessor implements AnnotationProcessor {
+  final KernelWorldBuilder worldBuilder;
+
+  KernelAnnotationProcessor(this.worldBuilder);
+
+  void extractNativeAnnotations(
+      LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder) {
+    ElementEnvironment elementEnvironment = worldBuilder.elementEnvironment;
+    CommonElements commonElements = worldBuilder.commonElements;
+
+    elementEnvironment.forEachClass(library, (ClassEntity cls) {
+      String annotationName;
+      for (ConstantExpression annotation
+          in worldBuilder._getClassMetadata(cls)) {

[Siggi Cherem (dart-lang), 2017/04/21 16:29:39]

add TODO:
 - make getClassMetadata public (with our plan of checking in unit tests that we
don't abuse it)
 - move this processor out of this library

[Johnni Winther, 2017/04/24 06:50:06]

Done.

+        ConstantValue value =
+            worldBuilder.constantEnvironment.getConstantValue(annotation);
+        String name = readAnnotationName(
+            cls, value, commonElements.nativeAnnotationClass);
+        if (annotationName == null) {
+          annotationName = name;
+        } else if (name != null) {
+          throw new SpannableAssertionFailure(
+              cls, 'Too many name annotations.');
+        }
+      }
+      if (annotationName != null) {
+        nativeBasicDataBuilder.setNativeClassTagInfo(cls, annotationName);
+      }
+    });
+  }
+
+  void extractJsInteropAnnotations(
+      LibraryEntity library, NativeBasicDataBuilder nativeBasicDataBuilder) {
+    throw new UnimplementedError(
+        'KernelAnnotationProcessor.extractJsInteropAnnotations');
+  }
+}