Add test annotations to package:expect

pkg/compiler/lib/src/js_backend/backend.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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 const bool USE_CPS_IR = const bool.fromEnvironment("USE_CPS_IR");
 
@@ skipping 75 matching lines @@
   /// to inline always.  Any function in this list must be inlinable with
   /// respect to the conditions used in [InlineWeeder.canInline], except for
   /// size/complexity heuristics.
   static const Map<String, List<String>> ALWAYS_INLINE =
       const <String, List<String>> {
     'IterableMixinWorkaround': const <String>['forEach'],
   };
 
   String get patchVersion => USE_NEW_EMITTER ? 'new' : 'old';
 
+  final Annotations annotations = new Annotations();
+
   /// List of [FunctionElement]s that we want to inline always.  This list is
   /// filled when resolution is complete by looking up in [internalLibrary].
   List<FunctionElement> functionsToAlwaysInline;
 
   /// Reference to the internal library to lookup functions to always inline.
   LibraryElement internalLibrary;
 
 
   /// Set of classes that need to be considered for reflection although not
   /// otherwise visible during resolution.
@@ skipping 1692 matching lines @@
       } else if (uri == DART_JS_MIRRORS) {
         disableTreeShakingMarker = find(library, 'disableTreeShaking');
         preserveMetadataMarker = find(library, 'preserveMetadata');
         preserveUrisMarker = find(library, 'preserveUris');
         preserveLibraryNamesMarker = find(library, 'preserveLibraryNames');
       } else if (uri == DART_JS_NAMES) {
         preserveNamesMarker = find(library, 'preserveNames');
       } else if (uri == DART_HTML) {
         htmlLibraryIsLoaded = true;
       }
+      annotations.onLibraryScanned(library);
     });
   }
 
   Future onLibrariesLoaded(LoadedLibraries loadedLibraries) {
     if (!loadedLibraries.containsLibrary(Compiler.DART_CORE)) {
       return new Future.value();
     }
 
     assert(loadedLibraries.containsLibrary(Compiler.DART_CORE));
     assert(loadedLibraries.containsLibrary(DART_INTERCEPTORS));
@@ skipping 508 matching lines @@
     assert(name != "");
     String outPath = compiler.outputUri != null
         ? compiler.outputUri.path
         : "out";
     String outName = outPath.substring(outPath.lastIndexOf('/') + 1);
     String extension = addExtension ? ".part.js" : "";
     return "${outName}_$name$extension";
   }
 }
 
+/// Handling of special annotations for tests.
+class Annotations {
+  static final Uri PACKAGE_EXPECT =
+      new Uri(scheme: 'package', path: 'expect/expect.dart');
+
+  ClassElement expectNoInliningClass;
+  ClassElement expectTrustTypeAnnotationsClass;
+  ClassElement expectAssumeDynamicClass;
+
+  void onLibraryScanned(LibraryElement library) {
+    if (library.canonicalUri == PACKAGE_EXPECT) {
+      expectNoInliningClass = library.find('NoInlining');
+      expectTrustTypeAnnotationsClass = library.find('TrustTypeAnnotations');
+      expectAssumeDynamicClass = library.find('AssumeDynamic');
+      if (expectNoInliningClass == null ||
+          expectTrustTypeAnnotationsClass == null ||
+          expectAssumeDynamicClass == null) {
+        // This is not the package you're looking for.
+        expectNoInliningClass = null;
+        expectTrustTypeAnnotationsClass = null;
+        expectAssumeDynamicClass = null;
+      }
+    }
+  }
+
+  /// Returns `true` if inlining is disabled for [element].
+  bool noInlining(Element element) {
+    return _hasAnnotation(element, expectNoInliningClass);
+  }
+
+  /// Returns `true` if parameter and returns types should be trusted for
+  /// [element].
+  bool trustTypeAnnotations(Element element) {
+    return _hasAnnotation(element, expectTrustTypeAnnotationsClass);
+  }
+
+  /// Returns `true` if inference of parameter types is disabled for [element].
+  bool assumeDynamic(Element element) {
+    return _hasAnnotation(element, expectAssumeDynamicClass);
+  }
+
+  /// Returns `true` if [element] is annotated with [annotationClass].
+  bool _hasAnnotation(Element element, ClassElement annotationClass) {
+    if (annotationClass == null) return false;
+    for (Link<MetadataAnnotation> link = element.metadata;
+         !link.isEmpty;
+         link = link.tail) {
+      ConstantValue value = link.head.constant.value;
+      if (value.isConstructedObject) {
+        ConstructedConstantValue constructedConstant = value;
+        if (constructedConstant.type.element == annotationClass) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+}
+
 class JavaScriptResolutionCallbacks extends ResolutionCallbacks {
   final JavaScriptBackend backend;
 
   JavaScriptResolutionCallbacks(this.backend);
 
   void registerBackendStaticInvocation(Element element, Registry registry) {
     registry.registerStaticInvocation(backend.registerBackendUse(element));
   }
 
   void registerBackendInstantiation(ClassElement element, Registry registry) {
@@ skipping 184 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }