unfork DDC's copy of most SDK libraries

pkg/dev_compiler/lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, 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 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 109 matching lines @@
   final ClassElement _jsArray;
 
   final ClassElement boolClass;
   final ClassElement intClass;
   final ClassElement interceptorClass;
   final ClassElement nullClass;
   final ClassElement numClass;
   final ClassElement objectClass;
   final ClassElement stringClass;
   final ClassElement functionClass;
-  final ClassElement symbolClass;
+  final ClassElement privateSymbolClass;
 
   ConstFieldVisitor _constants;
 
   /// The current function body being compiled.
   FunctionBody _currentFunction;
 
   /// Helper class for emitting elements in the proper order to allow
   /// JS to load the module.
   ElementLoader _loader;
 
@@ skipping 26 matching lines @@
         interceptorClass =
             _getLibrary(c, 'dart:_interceptors').getType('Interceptor'),
         dartCoreLibrary = _getLibrary(c, 'dart:core'),
         boolClass = _getLibrary(c, 'dart:core').getType('bool'),
         intClass = _getLibrary(c, 'dart:core').getType('int'),
         numClass = _getLibrary(c, 'dart:core').getType('num'),
         nullClass = _getLibrary(c, 'dart:core').getType('Null'),
         objectClass = _getLibrary(c, 'dart:core').getType('Object'),
         stringClass = _getLibrary(c, 'dart:core').getType('String'),
         functionClass = _getLibrary(c, 'dart:core').getType('Function'),
-        symbolClass = _getLibrary(c, 'dart:_internal').getType('Symbol'),
+        privateSymbolClass =
+            _getLibrary(c, 'dart:_internal').getType('PrivateSymbol'),
         dartJSLibrary = _getLibrary(c, 'dart:js');
 
   LibraryElement get currentLibrary => _loader.currentElement.library;
 
   /// The main entry point to JavaScript code generation.
   ///
   /// Takes the metadata for the build unit, as well as resolved trees and
   /// errors, and computes the output module code and optionally the source map.
   JSModuleFile compile(BuildUnit unit, List<CompilationUnit> compilationUnits,
       List<String> errors) {
@@ skipping 2066 matching lines @@
       for (var p in ctor.parameters.parameters) {
         var element = p.element;
         if (element is FieldFormalParameterElement) {
           fields[element.field] = _emitSimpleIdentifier(p.identifier);
         }
       }
 
       // Run constructor field initializers such as `: foo = bar.baz`
       for (var init in ctor.initializers) {
         if (init is ConstructorFieldInitializer) {
-          fields[init.fieldName.staticElement as FieldElement] =
-              _visit(init.expression);
+          var element = init.fieldName.staticElement as FieldElement;
+          fields[element] = _visit(init.expression);
         }
       }
     }
 
     for (var f in fields.keys) unsetFields.remove(f);
 
     // Initialize all remaining fields
     unsetFields.forEach((element, fieldNode) {
       JS.Expression value;
       if (fieldNode.initializer != null) {
@@ skipping 3073 matching lines @@
   visitNullLiteral(NullLiteral node) => new JS.LiteralNull();
 
   @override
   visitSymbolLiteral(SymbolLiteral node) {
     JS.Expression emitSymbol() {
       // TODO(vsm): Handle qualified symbols correctly.
       var last = node.components.last.toString();
       var name = js.string(node.components.join('.'), "'");
       if (last.startsWith('_')) {
         var nativeSymbol = _emitPrivateNameSymbol(currentLibrary, last);
-        return js.call('new #.es6(#, #)',
-            [_emitConstructorAccess(symbolClass.type), name, nativeSymbol]);
+        return js.call('new #(#, #)', [
+          _emitConstructorAccess(privateSymbolClass.type),
+          name,
+          nativeSymbol
+        ]);
       } else {
         return js
             .call('#.new(#)', [_emitConstructorAccess(types.symbolType), name]);
       }
     }
 
     return _emitConst(emitSymbol);
   }
 
   @override
@@ skipping 519 matching lines @@
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = resolutionMap
       .elementDeclaredByCompilationUnit(target.root as CompilationUnit)
       .library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }