Introduce ClassLike, MemberLike, FieldLike and FunctionLike

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../compiler.dart';
 import '../constants/values.dart';
@@ skipping 55 matching lines @@
 
   ConstantValue getConstantForSymbol(ir.SymbolLiteral node) {
     ast.Node astNode = getNode(node);
     ConstantValue constantValue = _backend.constants
         .getConstantValueForNode(astNode, _resolvedAst.elements);
     assert(invariant(astNode, constantValue != null,
         message: 'No constant computed for $node'));
     return constantValue;
   }
 
+  // TODO(johnniwinther): Use the more precise functions below.
   Element getElement(ir.Node node) {
     Element result = _nodeToElement[node];
     assert(invariant(CURRENT_ELEMENT_SPANNABLE, result != null,
         message: "No element found for $node."));
     return result;
   }
 
+  MemberElement getMember(ir.Node node) => getElement(node).declaration;
+
+  MethodElement getMethod(ir.Node node) => getElement(node).declaration;
+
+  ClassElement getClass(ir.Node node) => getElement(node).declaration;
+
   ast.Node getNode(ir.Node node) {
     ast.Node result = _nodeToAst[node];
     assert(result != null);
     return result;
   }
 
   Local getLocal(ir.VariableDeclaration variable) {
     // If this is a synthetic local, return the synthetic local
     if (variable.name == null) {
       return _syntheticLocals.putIfAbsent(
@@ skipping 149 matching lines @@
 
   JumpTarget getTargetDefinition(ir.Node node) =>
       elements.getTargetDefinition(getNode(node));
 
   ir.Procedure get mapLiteralConstructor =>
       kernel.functions[_backend.helpers.mapLiteralConstructor];
 
   ir.Procedure get mapLiteralConstructorEmpty =>
       kernel.functions[_backend.helpers.mapLiteralConstructorEmpty];
 
-  Element get jsIndexableLength => _backend.helpers.jsIndexableLength;
+  MemberElement get jsIndexableLength => _backend.helpers.jsIndexableLength;
 
   ir.Procedure get checkConcurrentModificationError =>
       kernel.functions[_backend.helpers.checkConcurrentModificationError];
 
   TypeMask get checkConcurrentModificationErrorReturnType =>
       TypeMaskFactory.inferredReturnTypeForElement(
           _backend.helpers.checkConcurrentModificationError, _compiler);
 
   ir.Procedure get assertHelper =>
       kernel.functions[_backend.helpers.assertHelper];
@@ skipping 78 matching lines @@
   @override
   DartType visitDynamicType(ir.DynamicType node) {
     return const DynamicType();
   }
 
   @override
   DartType visitInvalidType(ir.InvalidType node) {
     throw new UnimplementedError("Invalid types not currently supported");
   }
 }