Move native and js interop properties from the element model to the JS backend

pkg/compiler/lib/src/native/enqueue.dart

 // Copyright (c) 2014, 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 native;
 
 /**
  * This could be an abstract class but we use it as a stub for the dart_backend.
  */
 class NativeEnqueuer {
@@ skipping 102 matching lines @@
     processSubclassesOfNativeClasses(libraries);
     if (!enableLiveTypeAnalysis) {
       nativeClasses.forEach((c) => enqueueClass(c, 'forced'));
       flushQueue();
     }
   }
 
   void processNativeClassesInLibrary(LibraryElement library) {
     // Use implementation to ensure the inclusion of injected members.
     library.implementation.forEachLocalMember((Element element) {
-      if (element.isClass && element.isNative) {
+      if (element.isClass && backend.isNative(element)) {
         processNativeClass(element);
       }
     });
   }
 
   void processNativeClass(ClassElement classElement) {
     nativeClasses.add(classElement);
     unusedClasses.add(classElement);
     // Resolve class to ensure the class has valid inheritance info.
     classElement.ensureResolved(resolution);
@@ skipping 21 matching lines @@
           }
         }
       });
     });
 
     // Resolve all the native classes and any classes that might extend them in
     // [potentialExtends], and then check that the properly resolved class is in
     // fact a subclass of a native class.
 
     ClassElement nativeSuperclassOf(ClassElement classElement) {
-      if (classElement.isNative) return classElement;
+      if (backend.isNative(classElement)) return classElement;
       if (classElement.superclass == null) return null;
       return nativeSuperclassOf(classElement.superclass);
     }
 
     void walkPotentialSubclasses(ClassElement element) {
       if (nativeClassesAndSubclasses.contains(element)) return;
       element.ensureResolved(resolution);
       ClassElement nativeSuperclass = nativeSuperclassOf(element);
       if (nativeSuperclass != null) {
         nativeClassesAndSubclasses.add(element);
-        if (!element.isNative) {
+        if (!backend.isNative(element)) {
           nonNativeSubclasses.putIfAbsent(nativeSuperclass,
               () => new Set<ClassElement>())
             .add(element);
         }
         Set<ClassElement> potentialSubclasses = potentialExtends[element.name];
         if (potentialSubclasses != null) {
           potentialSubclasses.forEach(walkPotentialSubclasses);
         }
       }
     }
@@ skipping 156 matching lines @@
 
     if (firstTime) {
       queue.add(onFirstNativeClass);
     }
   }
 
   registerElement(Element element) {
     reporter.withCurrentElement(element, () {
       if (element.isFunction || element.isGetter || element.isSetter) {
         handleMethodAnnotations(element);
-        if (element.isNative) {
+        if (backend.isNative(element)) {
           registerMethodUsed(element);
         }
       } else if (element.isField) {
         handleFieldAnnotations(element);
-        if (element.isNative) {
+        if (backend.isNative(element)) {
           registerFieldLoad(element);
           registerFieldStore(element);
         }
       }
     });
   }
 
   handleFieldAnnotations(Element element) {
-    if (element.enclosingElement.isNative) {
+    if (backend.isNative(element.enclosingElement)) {
       // Exclude non-instance (static) fields - they not really native and are
       // compiled as isolate globals.  Access of a property of a constructor
       // function or a non-method property in the prototype chain, must be coded
       // using a JS-call.
       if (element.isInstanceMember) {
         setNativeName(element);
       }
     }
   }
 
   handleMethodAnnotations(Element method) {
     if (isNativeMethod(method)) {
       if (method.isStatic) {
         setNativeNameForStaticMethod(method);
       } else {
         setNativeName(method);
       }
     }
   }
 
   /// Sets the native name of [element], either from an annotation, or
   /// defaulting to the Dart name.
-  void setNativeName(ElementX element) {
+  void setNativeName(MemberElement element) {
     String name = findJsNameFromAnnotation(element);
     if (name == null) name = element.name;
-    element.setNative(name);
+    backend.setNativeMemberName(element, name);
   }
 
   /// Sets the native name of the static native method [element], using the
   /// following rules:
   /// 1. If [element] has a @JSName annotation that is an identifier, qualify
   ///    that identifier to the @Native name of the enclosing class
   /// 2. If [element] has a @JSName annotation that is not an identifier,
   ///    use the declared @JSName as the expression
   /// 3. If [element] does not have a @JSName annotation, qualify the name of
   ///    the method with the @Native name of the enclosing class.
-  void setNativeNameForStaticMethod(ElementX element) {
+  void setNativeNameForStaticMethod(MethodElement element) {
     String name = findJsNameFromAnnotation(element);
     if (name == null) name = element.name;
     if (isIdentifier(name)) {
-      List<String> nativeNames = nativeTagsOfClassRaw(element.enclosingClass);
+      List<String> nativeNames =
+          backend.getNativeTagsOfClassRaw(element.enclosingClass);
       if (nativeNames.length != 1) {
         reporter.internalError(element,
             'Unable to determine a native name for the enclosing class, '
             'options: $nativeNames');
       }
-      element.setNative('${nativeNames[0]}.$name');
+      backend.setNativeMemberName(element, '${nativeNames[0]}.$name');
     } else {
-      element.setNative(name);
+      backend.setNativeMemberName(element, name);
     }
   }
 
   bool isIdentifier(String s) => _identifier.hasMatch(s);
 
   bool isNativeMethod(FunctionElementX element) {
-    if (!element.library.canUseNative) return false;
+    if (!backend.canLibraryUseNative(element.library)) return false;
     // Native method?
     return reporter.withCurrentElement(element, () {
       Node node = element.parseNode(resolution.parsing);
       if (node is! FunctionExpression) return false;
       FunctionExpression functionExpression = node;
       node = functionExpression.body;
       Token token = node.getBeginToken();
       if (identical(token.stringValue, 'native')) return true;
       return false;
     });
@@ skipping 104 matching lines @@
 
   Map<String, ClassElement> tagOwner = new Map<String, ClassElement>();
 
   NativeResolutionEnqueuer(Enqueuer world, Compiler compiler)
     : super(world, compiler, compiler.enableNativeLiveTypeAnalysis);
 
   void processNativeClass(ClassElement classElement) {
     super.processNativeClass(classElement);
 
     // Js Interop interfaces do not have tags.
-    if (classElement.isJsInterop) return;
+    if (backend.isJsInterop(classElement)) return;
     // Since we map from dispatch tags to classes, a dispatch tag must be used
     // on only one native class.
-    for (String tag in nativeTagsOfClass(classElement)) {
+    for (String tag in backend.getNativeTagsOfClass(classElement)) {
       ClassElement owner = tagOwner[tag];
       if (owner != null) {
         if (owner != classElement) {
           reporter.internalError(
               classElement, "Tag '$tag' already in use by '${owner.name}'");
         }
       } else {
         tagOwner[tag] = classElement;
       }
     }
@@ skipping 79 matching lines @@
   }
 
   processClass(ClassElement classElement, cause) {
     super.processClass(classElement, cause);
     // Add the information that this class is a subtype of its supertypes.  The
     // code emitter and the ssa builder use that information.
     addSubtypes(classElement, emitter.nativeEmitter);
   }
 
   void addSubtypes(ClassElement cls, NativeEmitter emitter) {
-    if (!cls.isNative) return;
+    if (!backend.isNative(cls)) return;
     if (doneAddSubtypes.contains(cls)) return;
     doneAddSubtypes.add(cls);
 
     // Walk the superclass chain since classes on the superclass chain might not
     // be instantiated (abstract or simply unused).
     addSubtypes(cls.superclass, emitter);
 
     for (DartType type in cls.allSupertypes) {
       List<Element> subtypes = emitter.subtypes.putIfAbsent(
           type.element,
           () => <ClassElement>[]);
       subtypes.add(cls);
     }
 
     // Skip through all the mixin applications in the super class
     // chain. That way, the direct subtypes set only contain the
     // natives classes.
     ClassElement superclass = cls.superclass;
     while (superclass != null && superclass.isMixinApplication) {
-      assert(!superclass.isNative);
+      assert(!backend.isNative(superclass));
       superclass = superclass.superclass;
     }
 
     List<Element> directSubtypes = emitter.directSubtypes.putIfAbsent(
         superclass,
         () => <ClassElement>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(log(message)) {
     log('Compiled ${registeredClasses.length} native classes, '
         '${unusedClasses.length} native classes omitted.');
   }
 }