Implement constructor bodies and initializers in CPS->JS backend.

pkg/analyzer2dart/lib/src/cps_generator.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.
 
 library analyzer2dart.cps_generator;
 
 import 'package:analyzer/analyzer.dart';
 
 import 'package:compiler/src/dart_types.dart' as dart2js;
 import 'package:compiler/src/elements/elements.dart' as dart2js;
@@ skipping 32 matching lines @@
       analyzer.TopLevelVariableElement element) {
     CpsGeneratingVisitor visitor = new CpsGeneratingVisitor(converter, element);
     VariableDeclaration variableDeclaration = node;
     return visitor.handleFieldDeclaration(element, variableDeclaration);
   }
 }
 
 /// Visitor that converts analyzer AST nodes into CPS ir nodes.
 class CpsGeneratingVisitor extends SemanticVisitor<ir.Node>
     with IrBuilderMixin<AstNode> {
+  /// Promote the type of [irBuilder] to [DartIrBuilder].
+  /// The JS backend requires closure conversion which we do not support yet.
+  DartIrBuilder get irBuilder => super.irBuilder;
   final analyzer.Element element;
   final ElementConverter converter;
 
   CpsGeneratingVisitor(this.converter, this.element);
 
   Source get currentSource => element.source;
 
   analyzer.LibraryElement get currentLibrary => element.library;
 
   ir.Node visit(AstNode node) => node.accept(this);
 
   ir.FieldDefinition handleFieldDeclaration(
       analyzer.PropertyInducingElement field, VariableDeclaration node) {
     dart2js.FieldElement element = converter.convertElement(field);
     return withBuilder(
         new DartIrBuilder(DART_CONSTANT_SYSTEM,
                           element,
                           // TODO(johnniwinther): Supported closure variables.
-                          new NullClosureVariableInfo()),
+                          new NullCapturedVariableInfo()),
         () {
       irBuilder.buildFieldInitializerHeader();
       ir.Primitive initializer = build(node.initializer);
       return irBuilder.makeFieldDefinition(initializer);
     });
   }
 
   ir.FunctionDefinition handleFunctionDeclaration(
       analyzer.FunctionElement function, FunctionExpression node) {
     dart2js.FunctionElement element = converter.convertElement(function);
     return withBuilder(
         new DartIrBuilder(DART_CONSTANT_SYSTEM,
                           element,
                           // TODO(johnniwinther): Supported closure variables.
-                          new NullClosureVariableInfo()),
+                          new NullCapturedVariableInfo()),
         () {
       irBuilder.buildFunctionHeader(
           function.parameters.map(converter.convertElement));
       // Visit the body directly to avoid processing the signature as
       // expressions.
       visit(node.body);
       return irBuilder.makeFunctionDefinition(const []);
     });
   }
 
@@ skipping 421 matching lines @@
 
   @override
   ir.Primitive visitAsExpression(AsExpression node) {
     return irBuilder.buildTypeOperator(
         visit(node.expression),
         converter.convertType(node.type.type),
         isTypeTest: false);
   }
 }
 
-class NullClosureVariableInfo extends ClosureVariableInfo {
+class NullCapturedVariableInfo extends DartCapturedVariableInfo {
   Iterable get capturedVariables => const [];
 }