Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
deleted file mode 100644
index 6c266153502120b97a67edcb207ad9877eaddfc2..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/old_emitter/emitter.dart
+++ /dev/null
@@ -1,1998 +0,0 @@
-// 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 dart2js.js_emitter;
-
-
-class OldEmitter implements Emitter {
-  final Compiler compiler;
-  final CodeEmitterTask task;
-
-  final ContainerBuilder containerBuilder = new ContainerBuilder();
-  final ClassEmitter classEmitter = new ClassEmitter();
-  final NsmEmitter nsmEmitter = new NsmEmitter();
-  TypeTestEmitter get typeTestEmitter => task.typeTestEmitter;
-  final InterceptorEmitter interceptorEmitter = new InterceptorEmitter();
-  final MetadataEmitter metadataEmitter = new MetadataEmitter();
-
-  final Set<ConstantValue> cachedEmittedConstants;
-  final CodeBuffer cachedEmittedConstantsBuffer = new CodeBuffer();
-  final Map<Element, ClassBuilder> cachedClassBuilders;
-  final Set<Element> cachedElements;
-
-  bool needsDefineClass = false;
-  bool needsMixinSupport = false;
-  bool needsLazyInitializer = false;
-  final Namer namer;
-  ConstantEmitter constantEmitter;
-  NativeEmitter get nativeEmitter => task.nativeEmitter;
-
-  // The full code that is written to each hunk part-file.
-  Map<OutputUnit, CodeBuffer> outputBuffers = new Map<OutputUnit, CodeBuffer>();
-  final CodeBuffer deferredConstants = new CodeBuffer();
-
-  /** Shorter access to [isolatePropertiesName]. Both here in the code, as
-      well as in the generated code. */
-  String isolateProperties;
-  String classesCollector;
-  Set<ClassElement> get neededClasses => task.neededClasses;
-  Map<OutputUnit, List<ClassElement>> get outputClassLists
-      => task.outputClassLists;
-  Map<OutputUnit, List<ConstantValue>> get outputConstantLists
-      => task.outputConstantLists;
-  List<ClassElement> get nativeClasses => task.nativeClasses;
-  final Map<String, String> mangledFieldNames = <String, String>{};
-  final Map<String, String> mangledGlobalFieldNames = <String, String>{};
-  final Set<String> recordedMangledNames = new Set<String>();
-
-  final Map<ClassElement, Map<String, jsAst.Expression>> additionalProperties =
-      new Map<ClassElement, Map<String, jsAst.Expression>>();
-
-  List<TypedefElement> get typedefsNeededForReflection =>
-      task.typedefsNeededForReflection;
-
-  JavaScriptBackend get backend => compiler.backend;
-  TypeVariableHandler get typeVariableHandler => backend.typeVariableHandler;
-
-  String get _ => space;
-  String get space => compiler.enableMinification ? "" : " ";
-  String get n => compiler.enableMinification ? "" : "\n";
-  String get N => compiler.enableMinification ? "\n" : ";\n";
-
-  CodeBuffer getBuffer(OutputUnit outputUnit) {
-    return outputBuffers.putIfAbsent(outputUnit, () => new CodeBuffer());
-  }
-
-  CodeBuffer get mainBuffer {
-    return getBuffer(compiler.deferredLoadTask.mainOutputUnit);
-  }
-
-  /**
-   * List of expressions and statements that will be included in the
-   * precompiled function.
-   *
-   * To save space, dart2js normally generates constructors and accessors
-   * dynamically. This doesn't work in CSP mode, and may impact startup time
-   * negatively. So dart2js will emit these functions to a separate file that
-   * can be optionally included to support CSP mode or for faster startup.
-   */
-  Map<OutputUnit, List<jsAst.Node>> _cspPrecompiledFunctions =
-      new Map<OutputUnit, List<jsAst.Node>>();
-
-  Map<OutputUnit, List<jsAst.Expression>> _cspPrecompiledConstructorNames =
-      new Map<OutputUnit, List<jsAst.Expression>>();
-
-  /**
-   * Accumulate properties for classes and libraries, describing their
-   * static/top-level members.
-   * Later, these members are emitted when the class or library is emitted.
-   *
-   * See [getElementDescriptor].
-   */
-  // TODO(ahe): Generate statics with their class, and store only libraries in
-  // this map.
-  final Map<Element, ClassBuilder> elementDescriptors =
-      new Map<Element, ClassBuilder>();
-
-  final bool generateSourceMap;
-
-  OldEmitter(Compiler compiler, Namer namer, this.generateSourceMap, this.task)
-      : this.compiler = compiler,
-        this.namer = namer,
-        cachedEmittedConstants = compiler.cacheStrategy.newSet(),
-        cachedClassBuilders = compiler.cacheStrategy.newMap(),
-        cachedElements = compiler.cacheStrategy.newSet() {
-    constantEmitter =
-        new ConstantEmitter(compiler, namer, makeConstantListTemplate);
-    containerBuilder.emitter = this;
-    classEmitter.emitter = this;
-    nsmEmitter.emitter = this;
-    interceptorEmitter.emitter = this;
-    metadataEmitter.emitter = this;
-  }
-
-  List<jsAst.Node> cspPrecompiledFunctionFor(OutputUnit outputUnit) {
-    return _cspPrecompiledFunctions.putIfAbsent(
-        outputUnit,
-        () => new List<jsAst.Node>());
-  }
-
-  List<jsAst.Expression> cspPrecompiledConstructorNamesFor(
-      OutputUnit outputUnit) {
-    return _cspPrecompiledConstructorNames.putIfAbsent(
-        outputUnit,
-        () => new List<jsAst.Expression>());
-  }
-
-  /// Erases the precompiled information for csp mode for all output units.
-  /// Used by the incremental compiler.
-  void clearCspPrecompiledNodes() {
-    _cspPrecompiledFunctions.clear();
-    _cspPrecompiledConstructorNames.clear();
-  }
-
-  void addComment(String comment, CodeBuffer buffer) {
-    buffer.write(jsAst.prettyPrint(js.comment(comment), compiler));
-  }
-
-  jsAst.Expression constantReference(ConstantValue value) {
-    return constantEmitter.reference(value);
-  }
-
-  jsAst.Expression constantInitializerExpression(ConstantValue value) {
-    return constantEmitter.initializationExpression(value);
-  }
-
-  String get name => 'CodeEmitter';
-
-  String get currentGenerateAccessorName
-      => '${namer.currentIsolate}.\$generateAccessor';
-  String get generateAccessorHolder
-      => '$isolatePropertiesName.\$generateAccessor';
-  String get finishClassesProperty
-      => r'$finishClasses';
-  String get finishClassesName
-      => '${namer.isolateName}.$finishClassesProperty';
-  String get finishIsolateConstructorName
-      => '${namer.isolateName}.\$finishIsolateConstructor';
-  String get isolatePropertiesName
-      => '${namer.isolateName}.${namer.isolatePropertiesName}';
-  String get lazyInitializerName
-      => '${namer.isolateName}.\$lazy';
-  String get initName => 'init';
-  String get makeConstListProperty
-      => namer.getMappedInstanceName('makeConstantList');
-
-  /// For deferred loading we communicate the initializers via this global var.
-  final String deferredInitializers = r"$dart_deferred_initializers";
-
-  /// All the global state can be passed around with this variable.
-  String get globalsHolder => namer.getMappedGlobalName("globalsHolder");
-
-  jsAst.Expression generateEmbeddedGlobalAccess(String global) {
-    return js(generateEmbeddedGlobalAccessString(global));
-  }
-
-  String generateEmbeddedGlobalAccessString(String global) {
-    // TODO(floitsch): don't use 'init' as global embedder storage.
-    return '$initName.$global';
-  }
-
-  jsAst.FunctionDeclaration get generateAccessorFunction {
-    const RANGE1_SIZE = RANGE1_LAST - RANGE1_FIRST + 1;
-    const RANGE2_SIZE = RANGE2_LAST - RANGE2_FIRST + 1;
-    const RANGE1_ADJUST = - (FIRST_FIELD_CODE - RANGE1_FIRST);
-    const RANGE2_ADJUST = - (FIRST_FIELD_CODE + RANGE1_SIZE - RANGE2_FIRST);
-    const RANGE3_ADJUST =
-        - (FIRST_FIELD_CODE + RANGE1_SIZE + RANGE2_SIZE - RANGE3_FIRST);
-
-    String receiverParamName = compiler.enableMinification ? "r" : "receiver";
-    String valueParamName = compiler.enableMinification ? "v" : "value";
-    String reflectableField = namer.reflectableField;
-
-    return js.statement('''
-      function generateAccessor(fieldDescriptor, accessors, cls) {
-        var fieldInformation = fieldDescriptor.split("-");
-        var field = fieldInformation[0];
-        var len = field.length;
-        var code = field.charCodeAt(len - 1);
-        var reflectable;
-        if (fieldInformation.length > 1) reflectable = true;
-             else reflectable = false;
-        code = ((code >= $RANGE1_FIRST) && (code <= $RANGE1_LAST))
-              ? code - $RANGE1_ADJUST
-              : ((code >= $RANGE2_FIRST) && (code <= $RANGE2_LAST))
-                ? code - $RANGE2_ADJUST
-                : ((code >= $RANGE3_FIRST) && (code <= $RANGE3_LAST))
-                  ? code - $RANGE3_ADJUST
-                  : $NO_FIELD_CODE;
-
-        if (code) {  // needsAccessor
-          var getterCode = code & 3;
-          var setterCode = code >> 2;
-          var accessorName = field = field.substring(0, len - 1);
-
-          var divider = field.indexOf(":");
-          if (divider > 0) { // Colon never in first position.
-            accessorName = field.substring(0, divider);
-            field = field.substring(divider + 1);
-          }
-
-          if (getterCode) {  // needsGetter
-            var args = (getterCode & 2) ? "$receiverParamName" : "";
-            var receiver = (getterCode & 1) ? "this" : "$receiverParamName";
-            var body = "return " + receiver + "." + field;
-            var property =
-                cls + ".prototype.${namer.getterPrefix}" + accessorName + "=";
-            var fn = "function(" + args + "){" + body + "}";
-            if (reflectable)
-              accessors.push(property + "\$reflectable(" + fn + ");\\n");
-            else
-              accessors.push(property + fn + ";\\n");
-          }
-
-          if (setterCode) {  // needsSetter
-            var args = (setterCode & 2)
-                ? "$receiverParamName,${_}$valueParamName"
-                : "$valueParamName";
-            var receiver = (setterCode & 1) ? "this" : "$receiverParamName";
-            var body = receiver + "." + field + "$_=$_$valueParamName";
-            var property =
-                cls + ".prototype.${namer.setterPrefix}" + accessorName + "=";
-            var fn = "function(" + args + "){" + body + "}";
-            if (reflectable)
-              accessors.push(property + "\$reflectable(" + fn + ");\\n");
-            else
-              accessors.push(property + fn + ";\\n");
-          }
-        }
-
-        return field;
-      }''');
-  }
-
-  List get defineClassFunction {
-    // First the class name, then the field names in an array and the members
-    // (inside an Object literal).
-    // The caller can also pass in the constructor as a function if needed.
-    //
-    // Example:
-    // defineClass("A", ["x", "y"], {
-    //  foo$1: function(y) {
-    //   print(this.x + y);
-    //  },
-    //  bar$2: function(t, v) {
-    //   this.x = t - v;
-    //  },
-    // });
-
-    var defineClass = js('''function(name, cls, fields) {
-      var accessors = [];
-
-      var str = "function " + cls + "(";
-      var body = "";
-
-      for (var i = 0; i < fields.length; i++) {
-        if(i != 0) str += ", ";
-
-        var field = generateAccessor(fields[i], accessors, cls);
-        var parameter = "parameter_" + field;
-        str += parameter;
-        body += ("this." + field + " = " + parameter + ";\\n");
-      }
-      str += ") {\\n" + body + "}\\n";
-      str += cls + ".builtin\$cls=\\"" + name + "\\";\\n";
-      str += "\$desc=\$collectedClasses." + cls + ";\\n";
-      str += "if(\$desc instanceof Array) \$desc = \$desc[1];\\n";
-      str += cls + ".prototype = \$desc;\\n";
-      if (typeof defineClass.name != "string") {
-        str += cls + ".name=\\"" + cls + "\\";\\n";
-      }
-      str += accessors.join("");
-
-      return str;
-    }''');
-    // Declare a function called "generateAccessor".  This is used in
-    // defineClassFunction (it's a local declaration in init()).
-    return [
-        generateAccessorFunction,
-        js('$generateAccessorHolder = generateAccessor'),
-        new jsAst.FunctionDeclaration(
-            new jsAst.VariableDeclaration('defineClass'), defineClass) ];
-  }
-
-  /** Needs defineClass to be defined. */
-  List buildInheritFrom() {
-    return [js(r'''
-        var inheritFrom = function() {
-          function tmp() {}
-          var hasOwnProperty = Object.prototype.hasOwnProperty;
-          return function (constructor, superConstructor) {
-            tmp.prototype = superConstructor.prototype;
-            var object = new tmp();
-            var properties = constructor.prototype;
-            for (var member in properties)
-              if (hasOwnProperty.call(properties, member))
-                object[member] = properties[member];
-            object.constructor = constructor;
-            constructor.prototype = object;
-            return object;
-          };
-        }()
-      ''')];
-  }
-
-  jsAst.Fun get finishClassesFunction {
-    // Class descriptions are collected in a JS object.
-    // 'finishClasses' takes all collected descriptions and sets up
-    // the prototype.
-    // Once set up, the constructors prototype field satisfy:
-    //  - it contains all (local) members.
-    //  - its internal prototype (__proto__) points to the superclass'
-    //    prototype field.
-    //  - the prototype's constructor field points to the JavaScript
-    //    constructor.
-    // For engines where we have access to the '__proto__' we can manipulate
-    // the object literal directly. For other engines we have to create a new
-    // object and copy over the members.
-
-    String reflectableField = namer.reflectableField;
-    jsAst.Expression allClassesAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.ALL_CLASSES);
-    jsAst.Expression metadataAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.METADATA);
-    jsAst.Expression interceptorsByTagAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG);
-    jsAst.Expression leafTagsAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS);
-
-    return js('''
-      function(collectedClasses, isolateProperties, existingIsolateProperties) {
-        var pendingClasses = Object.create(null);
-        if (!#) # = Object.create(null);  // embedded allClasses.
-        var allClasses = #;  // embedded allClasses;
-
-        if (#)  // DEBUG_FAST_OBJECTS
-          print("Number of classes: " +
-              Object.getOwnPropertyNames(\$\$).length);
-
-        var hasOwnProperty = Object.prototype.hasOwnProperty;
-
-        if (typeof dart_precompiled == "function") {
-          var constructors = dart_precompiled(collectedClasses);
-        } else {
-          var combinedConstructorFunction =
-             "function \$reflectable(fn){fn.$reflectableField=1;return fn};\\n"+
-             "var \$desc;\\n";
-          var constructorsList = [];
-        }
-
-        for (var cls in collectedClasses) {
-          var desc = collectedClasses[cls];
-          if (desc instanceof Array) desc = desc[1];
-
-          /* The 'fields' are either a constructor function or a
-           * string encoding fields, constructor and superclass.  Get
-           * the superclass and the fields in the format
-           *   '[name/]Super;field1,field2'
-           * from the CLASS_DESCRIPTOR_PROPERTY property on the descriptor.
-           * The 'name/' is optional and contains the name that should be used
-           * when printing the runtime type string.  It is used, for example,
-           * to print the runtime type JSInt as 'int'.
-           */
-          var classData = desc["${namer.classDescriptorProperty}"],
-              supr, name = cls, fields = classData;
-          if (#)  // backend.hasRetainedMetadata
-            if (typeof classData == "object" &&
-                classData instanceof Array) {
-              classData = fields = classData[0];
-            }
-          if (typeof classData == "string") {
-            var split = classData.split("/");
-            if (split.length == 2) {
-              name = split[0];
-              fields = split[1];
-            }
-          }
-
-          var s = fields.split(";");
-          fields = s[1] == "" ? [] : s[1].split(",");
-          supr = s[0];
-          split = supr.split(":");
-          if (split.length == 2) {
-            supr = split[0];
-            var functionSignature = split[1];
-            if (functionSignature)
-              desc.\$signature = (function(s) {
-                  return function(){ return #[s]; };  // embedded metadata.
-                })(functionSignature);
-          }
-
-          if (#)  // needsMixinSupport
-            if (supr && supr.indexOf("+") > 0) {
-              s = supr.split("+");
-              supr = s[0];
-              var mixin = collectedClasses[s[1]];
-              if (mixin instanceof Array) mixin = mixin[1];
-              for (var d in mixin) {
-                if (hasOwnProperty.call(mixin, d) &&
-                    !hasOwnProperty.call(desc, d))
-                  desc[d] = mixin[d];
-              }
-            }
-
-          if (typeof dart_precompiled != "function") {
-            combinedConstructorFunction += defineClass(name, cls, fields);
-            constructorsList.push(cls);
-          }
-          if (supr) pendingClasses[cls] = supr;
-        }
-
-        if (typeof dart_precompiled != "function") {
-          combinedConstructorFunction +=
-             "return [\\n  " + constructorsList.join(",\\n  ") + "\\n]";
-           var constructors =
-            new Function("\$collectedClasses", combinedConstructorFunction)
-            (collectedClasses);
-          combinedConstructorFunction = null;
-        }
-
-        for (var i = 0; i < constructors.length; i++) {
-          var constructor = constructors[i];
-          var cls = constructor.name;
-          var desc = collectedClasses[cls];
-          var globalObject = isolateProperties;
-          if (desc instanceof Array) {
-            globalObject = desc[0] || isolateProperties;
-            desc = desc[1];
-          }
-          if (#) //backend.isTreeShakingDisabled,
-            constructor["${namer.metadataField}"] = desc;
-          allClasses[cls] = constructor;
-          globalObject[cls] = constructor;
-        }
-
-        constructors = null;
-
-        var finishedClasses = Object.create(null);
-        # = Object.create(null);  // embedded interceptorsByTag.
-        # = Object.create(null);  // embedded leafTags.
-
-        #;  // buildFinishClass(),
-
-        #;  // buildTrivialNsmHandlers()
-
-        for (var cls in pendingClasses) finishClass(cls);
-      }''', [
-          allClassesAccess, allClassesAccess,
-          allClassesAccess,
-          DEBUG_FAST_OBJECTS,
-          backend.hasRetainedMetadata,
-          metadataAccess,
-          needsMixinSupport,
-          backend.isTreeShakingDisabled,
-          interceptorsByTagAccess,
-          leafTagsAccess,
-          buildFinishClass(),
-          nsmEmitter.buildTrivialNsmHandlers()]);
-  }
-
-  jsAst.Node optional(bool condition, jsAst.Node node) {
-    return condition ? node : new jsAst.EmptyStatement();
-  }
-
-  jsAst.FunctionDeclaration buildFinishClass() {
-    String specProperty = '"${namer.nativeSpecProperty}"';  // "%"
-
-    jsAst.Expression interceptorsByTagAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG);
-    jsAst.Expression leafTagsAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS);
-
-    return js.statement('''
-      function finishClass(cls) {
-
-        if (finishedClasses[cls]) return;
-        finishedClasses[cls] = true;
-
-        var superclass = pendingClasses[cls];
-
-        // The superclass is only false (empty string) for the Dart Object
-        // class.  The minifier together with noSuchMethod can put methods on
-        // the Object.prototype object, and they show through here, so we check
-        // that we have a string.
-        if (!superclass || typeof superclass != "string") return;
-        finishClass(superclass);
-        var constructor = allClasses[cls];
-        var superConstructor = allClasses[superclass];
-
-        if (!superConstructor)
-          superConstructor = existingIsolateProperties[superclass];
-
-        var prototype = inheritFrom(constructor, superConstructor);
-
-        if (#) {  // !nativeClasses.isEmpty,
-          // The property looks like this:
-          //
-          // HtmlElement: {
-          //     "%": "HTMLDivElement|HTMLAnchorElement;HTMLElement;FancyButton"
-          //
-          // The first two semicolon-separated parts contain dispatch tags, the
-          // third contains the JavaScript names for classes.
-          //
-          // The tags indicate that JavaScript objects with the dispatch tags
-          // (usually constructor names) HTMLDivElement, HTMLAnchorElement and
-          // HTMLElement all map to the Dart native class named HtmlElement.
-          // The first set is for effective leaf nodes in the hierarchy, the
-          // second set is non-leaf nodes.
-          //
-          // The third part contains the JavaScript names of Dart classes that
-          // extend the native class. Here, FancyButton extends HtmlElement, so
-          // the runtime needs to know that window.HTMLElement.prototype is the
-          // prototype that needs to be extended in creating the custom element.
-          //
-          // The information is used to build tables referenced by
-          // getNativeInterceptor and custom element support.
-          if (Object.prototype.hasOwnProperty.call(prototype, $specProperty)) {
-            var nativeSpec = prototype[$specProperty].split(";");
-            if (nativeSpec[0]) {
-              var tags = nativeSpec[0].split("|");
-              for (var i = 0; i < tags.length; i++) {
-                #[tags[i]] = constructor;  // embedded interceptorsByTag.
-                #[tags[i]] = true;  // embedded leafTags.
-              }
-            }
-            if (nativeSpec[1]) {
-              tags = nativeSpec[1].split("|");
-              if (#) {  // User subclassing of native classes?
-                if (nativeSpec[2]) {
-                  var subclasses = nativeSpec[2].split("|");
-                  for (var i = 0; i < subclasses.length; i++) {
-                    var subclass = allClasses[subclasses[i]];
-                    subclass.\$nativeSuperclassTag = tags[0];
-                  }
-                }
-                for (i = 0; i < tags.length; i++) {
-                  #[tags[i]] = constructor;  // embedded interceptorsByTag.
-                  #[tags[i]] = false;  // embedded leafTags.
-                }
-              }
-            }
-          }
-        }
-      }''', [!nativeClasses.isEmpty,
-             interceptorsByTagAccess,
-             leafTagsAccess,
-             true,
-             interceptorsByTagAccess,
-             leafTagsAccess]);
-  }
-
-  jsAst.Fun get finishIsolateConstructorFunction {
-    // We replace the old Isolate function with a new one that initializes
-    // all its fields with the initial (and often final) value of all globals.
-    //
-    // We also copy over old values like the prototype, and the
-    // isolateProperties themselves.
-    return js('''
-      function (oldIsolate) {
-        var isolateProperties = oldIsolate.#;  // isolatePropertiesName
-        function Isolate() {
-          var hasOwnProperty = Object.prototype.hasOwnProperty;
-          for (var staticName in isolateProperties)
-            if (hasOwnProperty.call(isolateProperties, staticName))
-              this[staticName] = isolateProperties[staticName];
-
-          // Reset lazy initializers to null.
-          // When forcing the object to fast mode (below) v8 will consider
-          // functions as part the object's map. Since we will change them
-          // (after the first call to the getter), we would have a map
-          // transition.
-          var lazies = init.lazies;
-          for (var lazyInit in lazies) {
-             this[lazies[lazyInit]] = null;
-          }
-
-          // Use the newly created object as prototype. In Chrome,
-          // this creates a hidden class for the object and makes
-          // sure it is fast to access.
-          function ForceEfficientMap() {}
-          ForceEfficientMap.prototype = this;
-          new ForceEfficientMap();
-
-          // Now, after being a fast map we can set the lazies again.
-          for (var lazyInit in lazies) {
-            var lazyInitName = lazies[lazyInit];
-            this[lazyInitName] = isolateProperties[lazyInitName];
-          }
-        }
-        Isolate.prototype = oldIsolate.prototype;
-        Isolate.prototype.constructor = Isolate;
-        Isolate.# = isolateProperties;  // isolatePropertiesName
-        if (#)  // needsDefineClass.
-          Isolate.# = oldIsolate.#;  // finishClassesProperty * 2
-        if (#)  // outputContainsConstantList
-          Isolate.# = oldIsolate.#; // makeConstListProperty * 2
-        return Isolate;
-      }''',
-        [namer.isolatePropertiesName, namer.isolatePropertiesName,
-         needsDefineClass, finishClassesProperty, finishClassesProperty,
-         task.outputContainsConstantList,
-         makeConstListProperty, makeConstListProperty ]);
-  }
-
-  jsAst.Fun get lazyInitializerFunction {
-    String isolate = namer.currentIsolate;
-    jsAst.Expression cyclicThrow =
-        namer.elementAccess(backend.getCyclicThrowHelper());
-    jsAst.Expression laziesAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.LAZIES);
-
-    return js('''
-      function (prototype, staticName, fieldName, getterName, lazyValue) {
-        if (!#) # = Object.create(null);
-        #[fieldName] = getterName;
-
-        var sentinelUndefined = {};
-        var sentinelInProgress = {};
-        prototype[fieldName] = sentinelUndefined;
-
-        prototype[getterName] = function () {
-          var result = $isolate[fieldName];
-          try {
-            if (result === sentinelUndefined) {
-              $isolate[fieldName] = sentinelInProgress;
-
-              try {
-                result = $isolate[fieldName] = lazyValue();
-              } finally {
-                // Use try-finally, not try-catch/throw as it destroys the
-                // stack trace.
-                if (result === sentinelUndefined)
-                  $isolate[fieldName] = null;
-              }
-            } else {
-              if (result === sentinelInProgress)
-                #(staticName);
-            }
-
-            return result;
-          } finally {
-            $isolate[getterName] = function() { return this[fieldName]; };
-          }
-        }
-      }
-    ''', [laziesAccess, laziesAccess,
-          laziesAccess,
-          cyclicThrow]);
-  }
-
-  List buildDefineClassAndFinishClassFunctionsIfNecessary() {
-    if (!needsDefineClass) return [];
-    return defineClassFunction
-    ..addAll(buildInheritFrom())
-    ..addAll([
-      js('$finishClassesName = #', finishClassesFunction)
-    ]);
-  }
-
-  List buildLazyInitializerFunctionIfNecessary() {
-    if (!needsLazyInitializer) return [];
-
-    return [js('# = #', [js(lazyInitializerName), lazyInitializerFunction])];
-  }
-
-  List buildFinishIsolateConstructor() {
-    return [
-      js('$finishIsolateConstructorName = #', finishIsolateConstructorFunction)
-    ];
-  }
-
-  void emitFinishIsolateConstructorInvocation(CodeBuffer buffer) {
-    String isolate = namer.isolateName;
-    buffer.write("$isolate = $finishIsolateConstructorName($isolate)$N");
-  }
-
-  /// In minified mode we want to keep the name for the most common core types.
-  bool _isNativeTypeNeedingReflectionName(Element element) {
-    if (!element.isClass) return false;
-    return (element == compiler.intClass ||
-            element == compiler.doubleClass ||
-            element == compiler.numClass ||
-            element == compiler.stringClass ||
-            element == compiler.boolClass ||
-            element == compiler.nullClass ||
-            element == compiler.listClass);
-  }
-
-  /// Returns the "reflection name" of an [Element] or [Selector].
-  /// The reflection name of a getter 'foo' is 'foo'.
-  /// The reflection name of a setter 'foo' is 'foo='.
-  /// The reflection name of a method 'foo' is 'foo:N:M:O', where N is the
-  /// number of required arguments, M is the number of optional arguments, and
-  /// O is the named arguments.
-  /// The reflection name of a constructor is similar to a regular method but
-  /// starts with 'new '.
-  /// The reflection name of class 'C' is 'C'.
-  /// An anonymous mixin application has no reflection name.
-  /// This is used by js_mirrors.dart.
-  String getReflectionName(elementOrSelector, String mangledName) {
-    String name = elementOrSelector.name;
-    if (backend.shouldRetainName(name) ||
-        elementOrSelector is Element &&
-        // Make sure to retain names of unnamed constructors, and
-        // for common native types.
-        ((name == '' &&
-          backend.isAccessibleByReflection(elementOrSelector)) ||
-         _isNativeTypeNeedingReflectionName(elementOrSelector))) {
-
-      // TODO(ahe): Enable the next line when I can tell the difference between
-      // an instance method and a global.  They may have the same mangled name.
-      // if (recordedMangledNames.contains(mangledName)) return null;
-      recordedMangledNames.add(mangledName);
-      return getReflectionNameInternal(elementOrSelector, mangledName);
-    }
-    return null;
-  }
-
-  String getReflectionNameInternal(elementOrSelector, String mangledName) {
-    String name =
-        namer.privateName(elementOrSelector.library, elementOrSelector.name);
-    if (elementOrSelector.isGetter) return name;
-    if (elementOrSelector.isSetter) {
-      if (!mangledName.startsWith(namer.setterPrefix)) return '$name=';
-      String base = mangledName.substring(namer.setterPrefix.length);
-      String getter = '${namer.getterPrefix}$base';
-      mangledFieldNames.putIfAbsent(getter, () => name);
-      assert(mangledFieldNames[getter] == name);
-      recordedMangledNames.add(getter);
-      // TODO(karlklose,ahe): we do not actually need to store information
-      // about the name of this setter in the output, but it is needed for
-      // marking the function as invokable by reflection.
-      return '$name=';
-    }
-    if (elementOrSelector is Element && elementOrSelector.isClosure) {
-      // Closures are synthesized and their name might conflict with existing
-      // globals. Assign an illegal name, and make sure they don't clash
-      // with each other.
-      return " $mangledName";
-    }
-    if (elementOrSelector is Selector
-        || elementOrSelector.isFunction
-        || elementOrSelector.isConstructor) {
-      int requiredParameterCount;
-      int optionalParameterCount;
-      String namedArguments = '';
-      bool isConstructor = false;
-      if (elementOrSelector is Selector) {
-        Selector selector = elementOrSelector;
-        requiredParameterCount = selector.argumentCount;
-        optionalParameterCount = 0;
-        namedArguments = namedParametersAsReflectionNames(selector);
-      } else {
-        FunctionElement function = elementOrSelector;
-        if (function.isConstructor) {
-          isConstructor = true;
-          name = Elements.reconstructConstructorName(function);
-        }
-        FunctionSignature signature = function.functionSignature;
-        requiredParameterCount = signature.requiredParameterCount;
-        optionalParameterCount = signature.optionalParameterCount;
-        if (signature.optionalParametersAreNamed) {
-          var names = [];
-          for (Element e in signature.optionalParameters) {
-            names.add(e.name);
-          }
-          Selector selector = new Selector.call(
-              function.name,
-              function.library,
-              requiredParameterCount,
-              names);
-          namedArguments = namedParametersAsReflectionNames(selector);
-        } else {
-          // Named parameters are handled differently by mirrors.  For unnamed
-          // parameters, they are actually required if invoked
-          // reflectively. Also, if you have a method c(x) and c([x]) they both
-          // get the same mangled name, so they must have the same reflection
-          // name.
-          requiredParameterCount += optionalParameterCount;
-          optionalParameterCount = 0;
-        }
-      }
-      String suffix =
-          // TODO(ahe): We probably don't need optionalParameterCount in the
-          // reflection name.
-          '$name:$requiredParameterCount:$optionalParameterCount'
-          '$namedArguments';
-      return (isConstructor) ? 'new $suffix' : suffix;
-    }
-    Element element = elementOrSelector;
-    if (element.isGenerativeConstructorBody) {
-      return null;
-    } else if (element.isClass) {
-      ClassElement cls = element;
-      if (cls.isUnnamedMixinApplication) return null;
-      return cls.name;
-    } else if (element.isTypedef) {
-      return element.name;
-    }
-    throw compiler.internalError(element,
-        'Do not know how to reflect on this $element.');
-  }
-
-  String namedParametersAsReflectionNames(Selector selector) {
-    if (selector.getOrderedNamedArguments().isEmpty) return '';
-    String names = selector.getOrderedNamedArguments().join(':');
-    return ':$names';
-  }
-
-  jsAst.FunctionDeclaration buildCspPrecompiledFunctionFor(
-      OutputUnit outputUnit) {
-    // TODO(ahe): Compute a hash code.
-    return js.statement('''
-      function dart_precompiled(\$collectedClasses) {
-        var \$desc;
-        #;
-        return #;
-      }''',
-        [cspPrecompiledFunctionFor(outputUnit),
-         new jsAst.ArrayInitializer.from(
-             cspPrecompiledConstructorNamesFor(outputUnit))]);
-  }
-
-  void generateClass(ClassElement classElement, ClassBuilder properties) {
-    compiler.withCurrentElement(classElement, () {
-      if (compiler.hasIncrementalSupport) {
-        ClassBuilder builder =
-            cachedClassBuilders.putIfAbsent(classElement, () {
-              ClassBuilder builder = new ClassBuilder(classElement, namer);
-              classEmitter.generateClass(
-                  classElement, builder, additionalProperties[classElement]);
-              return builder;
-            });
-        invariant(classElement, builder.fields.isEmpty);
-        invariant(classElement, builder.superName == null);
-        invariant(classElement, builder.functionType == null);
-        invariant(classElement, builder.fieldMetadata == null);
-        properties.properties.addAll(builder.properties);
-      } else {
-        classEmitter.generateClass(
-            classElement, properties, additionalProperties[classElement]);
-      }
-    });
-  }
-
-  void emitFinishClassesInvocationIfNecessary(CodeBuffer buffer) {
-    if (needsDefineClass) {
-      buffer.write('$finishClassesName($classesCollector,'
-                   '$_$isolateProperties,'
-                   '${_}null)$N');
-
-      // Reset the map.
-      buffer.write("$classesCollector$_=${_}null$N$n");
-    }
-  }
-
-  void emitStaticFunctions(List<Element> staticFunctions) {
-    for (Element element in staticFunctions) {
-      ClassBuilder builder = new ClassBuilder(element, namer);
-      containerBuilder.addMember(element, builder);
-      getElementDescriptor(element).properties.addAll(builder.properties);
-    }
-  }
-
-  void emitStaticNonFinalFieldInitializations(CodeBuffer buffer) {
-    JavaScriptConstantCompiler handler = backend.constants;
-    Iterable<VariableElement> staticNonFinalFields =
-        handler.getStaticNonFinalFieldsForEmission();
-    for (Element element in Elements.sortedByPosition(staticNonFinalFields)) {
-      // [:interceptedNames:] is handled in [emitInterceptedNames].
-      if (element == backend.interceptedNames) continue;
-      // `mapTypeToInterceptor` is handled in [emitMapTypeToInterceptor].
-      if (element == backend.mapTypeToInterceptor) continue;
-      compiler.withCurrentElement(element, () {
-        ConstantValue initialValue = handler.getInitialValueFor(element).value;
-        jsAst.Expression init =
-          js('$isolateProperties.# = #',
-              [namer.getNameOfGlobalField(element),
-               constantEmitter.referenceInInitializationContext(initialValue)]);
-        buffer.write(jsAst.prettyPrint(init, compiler,
-                                       monitor: compiler.dumpInfoTask));
-        buffer.write('$N');
-      });
-    }
-  }
-
-  void emitLazilyInitializedStaticFields(CodeBuffer buffer) {
-    JavaScriptConstantCompiler handler = backend.constants;
-    List<VariableElement> lazyFields =
-        handler.getLazilyInitializedFieldsForEmission();
-    if (!lazyFields.isEmpty) {
-      needsLazyInitializer = true;
-      for (VariableElement element in Elements.sortedByPosition(lazyFields)) {
-        jsAst.Expression code = backend.generatedCode[element];
-        // The code is null if we ended up not needing the lazily
-        // initialized field after all because of constant folding
-        // before code generation.
-        if (code == null) continue;
-        // The code only computes the initial value. We build the lazy-check
-        // here:
-        //   lazyInitializer(prototype, 'name', fieldName, getterName, initial);
-        // The name is used for error reporting. The 'initial' must be a
-        // closure that constructs the initial value.
-        jsAst.Expression init = js('#(#,#,#,#,#)',
-            [js(lazyInitializerName),
-                js(isolateProperties),
-                js.string(element.name),
-                js.string(namer.getNameX(element)),
-                js.string(namer.getLazyInitializerName(element)),
-                code]);
-        buffer.write(jsAst.prettyPrint(init, compiler,
-                                       monitor: compiler.dumpInfoTask));
-        buffer.write("$N");
-      }
-    }
-  }
-
-  bool isConstantInlinedOrAlreadyEmitted(ConstantValue constant) {
-    if (constant.isFunction) return true;    // Already emitted.
-    if (constant.isPrimitive) return true;   // Inlined.
-    if (constant.isDummy) return true;       // Inlined.
-    // The name is null when the constant is already a JS constant.
-    // TODO(floitsch): every constant should be registered, so that we can
-    // share the ones that take up too much space (like some strings).
-    if (namer.constantName(constant) == null) return true;
-    return false;
-  }
-
-  int compareConstants(ConstantValue a, ConstantValue b) {
-    // Inlined constants don't affect the order and sometimes don't even have
-    // names.
-    int cmp1 = isConstantInlinedOrAlreadyEmitted(a) ? 0 : 1;
-    int cmp2 = isConstantInlinedOrAlreadyEmitted(b) ? 0 : 1;
-    if (cmp1 + cmp2 < 2) return cmp1 - cmp2;
-
-    // Emit constant interceptors first. Constant interceptors for primitives
-    // might be used by code that builds other constants.  See Issue 18173.
-    if (a.isInterceptor != b.isInterceptor) {
-      return a.isInterceptor ? -1 : 1;
-    }
-
-    // Sorting by the long name clusters constants with the same constructor
-    // which compresses a tiny bit better.
-    int r = namer.constantLongName(a).compareTo(namer.constantLongName(b));
-    if (r != 0) return r;
-    // Resolve collisions in the long name by using the constant name (i.e. JS
-    // name) which is unique.
-    return namer.constantName(a).compareTo(namer.constantName(b));
-  }
-
-  void emitCompileTimeConstants(CodeBuffer buffer, OutputUnit outputUnit) {
-    List<ConstantValue> constants = outputConstantLists[outputUnit];
-    if (constants == null) return;
-    bool isMainBuffer = buffer == mainBuffer;
-    if (compiler.hasIncrementalSupport && isMainBuffer) {
-      buffer = cachedEmittedConstantsBuffer;
-    }
-    for (ConstantValue constant in constants) {
-      if (compiler.hasIncrementalSupport && isMainBuffer) {
-        if (cachedEmittedConstants.contains(constant)) continue;
-        cachedEmittedConstants.add(constant);
-      }
-      String name = namer.constantName(constant);
-      jsAst.Expression init = js('#.# = #',
-          [namer.globalObjectForConstant(constant), name,
-           constantInitializerExpression(constant)]);
-      buffer.write(jsAst.prettyPrint(init, compiler,
-                                     monitor: compiler.dumpInfoTask));
-      buffer.write('$N');
-    }
-    if (compiler.hasIncrementalSupport && isMainBuffer) {
-      mainBuffer.add(cachedEmittedConstantsBuffer);
-    }
-  }
-
-  jsAst.Template get makeConstantListTemplate {
-    // TODO(floitsch): there is no harm in caching the template.
-    return jsAst.js.uncachedExpressionTemplate(
-        '${namer.isolateName}.$makeConstListProperty(#)');
-  }
-
-  void emitMakeConstantList(CodeBuffer buffer) {
-    buffer.write(
-        jsAst.prettyPrint(
-            // Functions are stored in the hidden class and not as properties in
-            // the object. We never actually look at the value, but only want
-            // to know if the property exists.
-            js.statement(r'''#.# = function(list) {
-                                     list.immutable$list = Array;
-                                     list.fixed$length = Array;
-                                     return list;
-                                   }''',
-                         [namer.isolateName, makeConstListProperty]),
-            compiler, monitor: compiler.dumpInfoTask));
-    buffer.write(N);
-  }
-
-  /// Returns the code equivalent to:
-  ///   `function(args) { $.startRootIsolate(X.main$closure(), args); }`
-  jsAst.Expression buildIsolateSetupClosure(Element appMain,
-                                            Element isolateMain) {
-    jsAst.Expression mainAccess = namer.isolateStaticClosureAccess(appMain);
-    // Since we pass the closurized version of the main method to
-    // the isolate method, we must make sure that it exists.
-    return js('function(a){ #(#, a); }',
-        [namer.elementAccess(isolateMain), mainAccess]);
-  }
-
-  /**
-   * Emits code that sets the `isolateTag embedded global to a unique string.
-   */
-  jsAst.Expression generateIsolateAffinityTagInitialization() {
-    jsAst.Expression getIsolateTagAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.GET_ISOLATE_TAG);
-    jsAst.Expression isolateTagAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.ISOLATE_TAG);
-
-    return js('''
-      !function() {
-        // On V8, the 'intern' function converts a string to a symbol, which
-        // makes property access much faster.
-        function intern(s) {
-          var o = {};
-          o[s] = 1;
-          return Object.keys(convertToFastObject(o))[0];
-        }
-
-        # = function(name) {  // embedded getIsolateTag
-          return intern("___dart_" + name + #);  // embedded isolateTag
-        };
-
-        // To ensure that different programs loaded into the same context (page)
-        // use distinct dispatch properies, we place an object on `Object` to
-        // contain the names already in use.
-        var tableProperty = "___dart_isolate_tags_";
-        var usedProperties = Object[tableProperty] ||
-            (Object[tableProperty] = Object.create(null));
-
-        var rootProperty = "_${generateIsolateTagRoot()}";
-        for (var i = 0; ; i++) {
-          var property = intern(rootProperty + "_" + i + "_");
-          if (!(property in usedProperties)) {
-            usedProperties[property] = 1;
-            # = property;  // embedded isolateTag
-            break;
-          }
-        }
-      }()
-    ''', [getIsolateTagAccess,
-          isolateTagAccess,
-          isolateTagAccess]);
-  }
-
-  jsAst.Expression generateDispatchPropertyNameInitialization() {
-    jsAst.Expression dispatchPropertyNameAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.DISPATCH_PROPERTY_NAME);
-    jsAst.Expression getIsolateTagAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.GET_ISOLATE_TAG);
-    return js('# = #("dispatch_record")',
-        [dispatchPropertyNameAccess,
-         getIsolateTagAccess]);
-  }
-
-  String generateIsolateTagRoot() {
-    // TODO(sra): MD5 of contributing source code or URIs?
-    return 'ZxYxX';
-  }
-
-  emitMain(CodeBuffer buffer) {
-    if (compiler.isMockCompilation) return;
-    Element main = compiler.mainFunction;
-    jsAst.Expression mainCallClosure = null;
-    if (compiler.hasIsolateSupport) {
-      Element isolateMain =
-        backend.isolateHelperLibrary.find(JavaScriptBackend.START_ROOT_ISOLATE);
-      mainCallClosure = buildIsolateSetupClosure(main, isolateMain);
-    } else if (compiler.hasIncrementalSupport) {
-      mainCallClosure =
-          js('function() { return #(); }', namer.elementAccess(main));
-    } else {
-      mainCallClosure = namer.elementAccess(main);
-    }
-
-    if (backend.needToInitializeIsolateAffinityTag) {
-      buffer.write(
-          jsAst.prettyPrint(generateIsolateAffinityTagInitialization(),
-                            compiler, monitor: compiler.dumpInfoTask));
-      buffer.write(N);
-    }
-    if (backend.needToInitializeDispatchProperty) {
-      assert(backend.needToInitializeIsolateAffinityTag);
-      buffer.write(
-          jsAst.prettyPrint(generateDispatchPropertyNameInitialization(),
-              compiler, monitor: compiler.dumpInfoTask));
-      buffer.write(N);
-    }
-
-    jsAst.Expression currentScriptAccess =
-        generateEmbeddedGlobalAccess(embeddedNames.CURRENT_SCRIPT);
-
-    addComment('BEGIN invoke [main].', buffer);
-    // This code finds the currently executing script by listening to the
-    // onload event of all script tags and getting the first script which
-    // finishes. Since onload is called immediately after execution this should
-    // not substantially change execution order.
-    jsAst.Statement invokeMain = js.statement('''
-(function (callback) {
-  if (typeof document === "undefined") {
-    callback(null);
-    return;
-  }
-  if (document.currentScript) {
-    callback(document.currentScript);
-    return;
-  }
-
-  var scripts = document.scripts;
-  function onLoad(event) {
-    for (var i = 0; i < scripts.length; ++i) {
-      scripts[i].removeEventListener("load", onLoad, false);
-    }
-    callback(event.target);
-  }
-  for (var i = 0; i < scripts.length; ++i) {
-    scripts[i].addEventListener("load", onLoad, false);
-  }
-})(function(currentScript) {
-  # = currentScript;  // embedded currentScript.
-
-  if (typeof dartMainRunner === "function") {
-    dartMainRunner(#, []);  // mainCallClosure.
-  } else {
-    #([]);  // mainCallClosure.
-  }
-})$N''', [currentScriptAccess,
-          mainCallClosure,
-          mainCallClosure]);
-
-    buffer.write(';');
-    buffer.write(jsAst.prettyPrint(invokeMain,
-                 compiler, monitor: compiler.dumpInfoTask));
-    buffer.write(N);
-    addComment('END invoke [main].', buffer);
-  }
-
-  void emitInitFunction(CodeBuffer buffer) {
-    jsAst.FunctionDeclaration decl = js.statement('''
-      function init() {
-        $isolateProperties = Object.create(null);
-        #; #; #;
-      }''', [
-          buildDefineClassAndFinishClassFunctionsIfNecessary(),
-          buildLazyInitializerFunctionIfNecessary(),
-          buildFinishIsolateConstructor()]);
-
-    buffer.write(jsAst.prettyPrint(decl,
-                 compiler, monitor: compiler.dumpInfoTask).getText());
-    if (compiler.enableMinification) buffer.write('\n');
-  }
-
-  void emitConvertToFastObjectFunction() {
-    List<jsAst.Statement> debugCode = <jsAst.Statement>[];
-    if (DEBUG_FAST_OBJECTS) {
-      debugCode.add(js.statement(r'''
-        // The following only works on V8 when run with option
-        // "--allow-natives-syntax".  We use'new Function' because the
-         // miniparser does not understand V8 native syntax.
-        if (typeof print === "function") {
-          var HasFastProperties =
-            new Function("a", "return %HasFastProperties(a)");
-          print("Size of global object: "
-                   + String(Object.getOwnPropertyNames(properties).length)
-                   + ", fast properties " + HasFastProperties(properties));
-        }'''));
-    }
-
-    jsAst.Statement convertToFastObject = js.statement(r'''
-      function convertToFastObject(properties) {
-        // Create an instance that uses 'properties' as prototype. This should
-        // make 'properties' a fast object.
-        function MyClass() {};
-        MyClass.prototype = properties;
-        new MyClass();
-        #;
-        return properties;
-      }''', [debugCode]);
-
-    mainBuffer.add(jsAst.prettyPrint(convertToFastObject, compiler));
-    mainBuffer.add(N);
-  }
-
-  void writeLibraryDescriptors(CodeBuffer buffer, LibraryElement library) {
-    var uri = "";
-    if (!compiler.enableMinification || backend.mustPreserveUris) {
-      uri = library.canonicalUri;
-      if (uri.scheme == 'file' && compiler.outputUri != null) {
-        uri = relativize(compiler.outputUri, library.canonicalUri, false);
-      }
-    }
-    ClassBuilder descriptor = elementDescriptors[library];
-    if (descriptor == null) {
-      // Nothing of the library was emitted.
-      // TODO(floitsch): this should not happen. We currently have an example
-      // with language/prefix6_negative_test.dart where we have an instance
-      // method without its corresponding class.
-      return;
-    }
-
-    String libraryName =
-        (!compiler.enableMinification || backend.mustRetainLibraryNames) ?
-        library.getLibraryName() :
-        "";
-
-    jsAst.Fun metadata = metadataEmitter.buildMetadataFunction(library);
-
-    jsAst.ObjectInitializer initializers = descriptor.toObjectInitializer();
-
-    compiler.dumpInfoTask.registerElementAst(library, metadata);
-    compiler.dumpInfoTask.registerElementAst(library, initializers);
-    buffer
-        ..write('["$libraryName",$_')
-        ..write('"${uri}",$_')
-        ..write(metadata == null ? "" : jsAst.prettyPrint(metadata,
-                                              compiler,
-                                              monitor: compiler.dumpInfoTask))
-        ..write(',$_')
-        ..write(namer.globalObjectFor(library))
-        ..write(',$_')
-        ..write(jsAst.prettyPrint(initializers,
-                                  compiler,
-                                  monitor: compiler.dumpInfoTask))
-        ..write(library == compiler.mainApp ? ',${n}1' : "")
-        ..write('],$n');
-  }
-
-  void emitPrecompiledConstructor(OutputUnit outputUnit,
-                                  String constructorName,
-                                  jsAst.Expression constructorAst) {
-    cspPrecompiledFunctionFor(outputUnit).add(
-        new jsAst.FunctionDeclaration(
-            new jsAst.VariableDeclaration(constructorName), constructorAst));
-    cspPrecompiledFunctionFor(outputUnit).add(
-    js.statement(r'''{
-          #.builtin$cls = #;
-          if (!"name" in #)
-              #.name = #;
-          $desc=$collectedClasses.#;
-          if ($desc instanceof Array) $desc = $desc[1];
-          #.prototype = $desc;
-        }''',
-        [   constructorName, js.string(constructorName),
-            constructorName,
-            constructorName, js.string(constructorName),
-            constructorName,
-            constructorName
-         ]));
-
-    cspPrecompiledConstructorNamesFor(outputUnit).add(js('#', constructorName));
-  }
-
-  /// Extracts the output name of the compiler's outputUri.
-  String deferredPartFileName(OutputUnit outputUnit,
-                              {bool addExtension: true}) {
-    String outPath = compiler.outputUri != null
-        ? compiler.outputUri.path
-        : "out";
-    String outName = outPath.substring(outPath.lastIndexOf('/') + 1);
-    String extension = addExtension ? ".part.js" : "";
-    if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) {
-      return "$outName$extension";
-    } else {
-      String name = outputUnit.name;
-      return "${outName}_$name$extension";
-    }
-  }
-
-  void emitLibraries(Iterable<LibraryElement> libraries) {
-    if (libraries.isEmpty) return;
-
-    // TODO(karlklose): document what kinds of fields this loop adds to the
-    // library class builder.
-    for (LibraryElement element in libraries) {
-      LibraryElement library = element;
-      ClassBuilder builder = new ClassBuilder(library, namer);
-      if (classEmitter.emitFields(library, builder, null, emitStatics: true)) {
-        jsAst.ObjectInitializer initializer = builder.toObjectInitializer();
-        compiler.dumpInfoTask.registerElementAst(builder.element, initializer);
-        getElementDescriptor(library).properties.addAll(initializer.properties);
-      }
-    }
-  }
-
-  void emitTypedefs() {
-    OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;
-
-    // Emit all required typedef declarations into the main output unit.
-    // TODO(karlklose): unify required classes and typedefs to declarations
-    // and have builders for each kind.
-    for (TypedefElement typedef in typedefsNeededForReflection) {
-      OutputUnit mainUnit = compiler.deferredLoadTask.mainOutputUnit;
-      LibraryElement library = typedef.library;
-      // TODO(karlklose): add a TypedefBuilder and move this code there.
-      DartType type = typedef.alias;
-      int typeIndex = metadataEmitter.reifyType(type);
-      String typeReference =
-          encoding.encodeTypedefFieldDescriptor(typeIndex);
-      jsAst.Property descriptor = new jsAst.Property(
-          js.string(namer.classDescriptorProperty),
-          js.string(typeReference));
-      jsAst.Node declaration = new jsAst.ObjectInitializer([descriptor]);
-      String mangledName = namer.getNameX(typedef);
-      String reflectionName = getReflectionName(typedef, mangledName);
-      getElementDescriptor(library)
-          ..addProperty(mangledName, declaration)
-          ..addProperty("+$reflectionName", js.string(''));
-      // Also emit a trivial constructor for CSP mode.
-      String constructorName = mangledName;
-      jsAst.Expression constructorAst = js('function() {}');
-      emitPrecompiledConstructor(mainOutputUnit,
-                                 constructorName,
-                                 constructorAst);
-    }
-  }
-
-  void emitMangledNames() {
-    if (!mangledFieldNames.isEmpty) {
-      var keys = mangledFieldNames.keys.toList();
-      keys.sort();
-      var properties = [];
-      for (String key in keys) {
-        var value = js.string('${mangledFieldNames[key]}');
-        properties.add(new jsAst.Property(js.string(key), value));
-      }
-
-      jsAst.Expression mangledNamesAccess =
-          generateEmbeddedGlobalAccess(embeddedNames.MANGLED_NAMES);
-      var map = new jsAst.ObjectInitializer(properties);
-      mainBuffer.write(
-          jsAst.prettyPrint(
-              js.statement('# = #', [mangledNamesAccess, map]),
-              compiler,
-              monitor: compiler.dumpInfoTask));
-      if (compiler.enableMinification) {
-        mainBuffer.write(';');
-      }
-    }
-    if (!mangledGlobalFieldNames.isEmpty) {
-      var keys = mangledGlobalFieldNames.keys.toList();
-      keys.sort();
-      var properties = [];
-      for (String key in keys) {
-        var value = js.string('${mangledGlobalFieldNames[key]}');
-        properties.add(new jsAst.Property(js.string(key), value));
-      }
-      jsAst.Expression mangledGlobalNamesAccess =
-          generateEmbeddedGlobalAccess(embeddedNames.MANGLED_GLOBAL_NAMES);
-      var map = new jsAst.ObjectInitializer(properties);
-      mainBuffer.write(
-          jsAst.prettyPrint(
-              js.statement('# = #', [mangledGlobalNamesAccess, map]),
-              compiler,
-              monitor: compiler.dumpInfoTask));
-      if (compiler.enableMinification) {
-        mainBuffer.write(';');
-      }
-    }
-  }
-
-  void checkEverythingEmitted(Iterable<Element> elements) {
-    List<Element> pendingStatics;
-    if (!compiler.hasIncrementalSupport) {
-      pendingStatics =
-          Elements.sortedByPosition(elements.where((e) => !e.isLibrary));
-
-      pendingStatics.forEach((element) =>
-          compiler.reportInfo(
-              element, MessageKind.GENERIC, {'text': 'Pending statics.'}));
-    }
-
-    if (pendingStatics != null && !pendingStatics.isEmpty) {
-      compiler.internalError(pendingStatics.first,
-          'Pending statics (see above).');
-    }
-  }
-
-  void emitMainOutputUnit(Map<OutputUnit, String> deferredLoadHashes,
-                          CodeBuffer nativeBuffer) {
-    bool isProgramSplit = compiler.deferredLoadTask.isProgramSplit;
-    OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;
-
-    mainBuffer.add(buildGeneratedBy());
-    addComment(HOOKS_API_USAGE, mainBuffer);
-
-    if (isProgramSplit) {
-      /// For deferred loading we communicate the initializers via this global
-      /// variable. The deferred hunks will add their initialization to this.
-      /// The semicolon is important in minified mode, without it the
-      /// following parenthesis looks like a call to the object literal.
-      mainBuffer..add(
-          'self.${deferredInitializers} = self.${deferredInitializers} || '
-          'Object.create(null);$n');
-    }
-
-    // Using a named function here produces easier to read stack traces in
-    // Chrome/V8.
-    mainBuffer.add('(function(${namer.currentIsolate})$_{\n');
-    if (compiler.hasIncrementalSupport) {
-      mainBuffer.add(
-          '(this.\$dart_unsafe_eval ='
-          ' this.\$dart_unsafe_eval || Object.create(null))'
-          '.patch = function(a) { eval(a) }$N');
-    }
-    if (isProgramSplit) {
-      /// We collect all the global state of the, so it can be passed to the
-      /// initializer of deferred files.
-      mainBuffer.add('var ${globalsHolder}$_=${_}Object.create(null)$N');
-    }
-    mainBuffer.add('function dart()$_{$n'
-        '${_}${_}this.x$_=${_}0$N'
-        '${_}${_}delete this.x$N'
-        '}$n');
-    for (String globalObject in Namer.reservedGlobalObjectNames) {
-      // The global objects start as so-called "slow objects". For V8, this
-      // means that it won't try to make map transitions as we add properties
-      // to these objects. Later on, we attempt to turn these objects into
-      // fast objects by calling "convertToFastObject" (see
-      // [emitConvertToFastObjectFunction]).
-      mainBuffer.write('var ${globalObject}$_=${_}');
-      if(isProgramSplit) {
-        mainBuffer.add('${globalsHolder}.$globalObject$_=${_}');
-      }
-      mainBuffer.write('new dart$N');
-    }
-
-    mainBuffer.add('function ${namer.isolateName}()$_{}\n');
-    if (isProgramSplit) {
-      mainBuffer
-        .write('${globalsHolder}.${namer.isolateName}$_=$_'
-               '${namer.isolateName}$N'
-               '${globalsHolder}.$initName$_=${_}$initName$N');
-    }
-    mainBuffer.add('init()$N$n');
-    mainBuffer.add('$isolateProperties$_=$_$isolatePropertiesName$N');
-
-    emitStaticFunctions(task.outputStaticLists[mainOutputUnit]);
-
-    // Only output the classesCollector if we actually have any classes.
-    if (!(nativeClasses.isEmpty &&
-          compiler.codegenWorld.staticFunctionsNeedingGetter.isEmpty &&
-          outputClassLists.values.every((classList) => classList.isEmpty) &&
-          typedefsNeededForReflection.isEmpty)) {
-      // Shorten the code by using "$$" as temporary.
-      classesCollector = r"$$";
-      mainBuffer.add('var $classesCollector$_=${_}Object.create(null)$N$n');
-    }
-
-    if (!nativeClasses.isEmpty) {
-      addComment('Native classes', mainBuffer);
-    }
-
-    List<ClassElement> classes = task.outputClassLists[mainOutputUnit];
-    if (classes != null) {
-      for (ClassElement element in classes) {
-        generateClass(element, getElementDescriptor(element));
-      }
-    }
-
-    if (compiler.enableMinification) {
-      mainBuffer.write(';');
-    }
-
-    if (elementDescriptors.isNotEmpty) {
-      Iterable<LibraryElement> libraries =
-          task.outputLibraryLists[mainOutputUnit];
-      if (libraries == null) libraries = [];
-      emitLibraries(libraries);
-      emitTypedefs();
-      emitMangledNames();
-
-      checkEverythingEmitted(elementDescriptors.keys);
-
-      CodeBuffer libraryBuffer = new CodeBuffer();
-      for (LibraryElement library in Elements.sortedByPosition(libraries)) {
-        writeLibraryDescriptors(libraryBuffer, library);
-        elementDescriptors.remove(library);
-      }
-
-      mainBuffer
-          ..write('(')
-          ..write(
-              jsAst.prettyPrint(
-                  getReflectionDataParser(classesCollector, backend),
-                  compiler))
-          ..write(')')
-          ..write('([$n')
-          ..add(libraryBuffer)
-          ..write('])$N');
-
-      emitFinishClassesInvocationIfNecessary(mainBuffer);
-    }
-
-    typeTestEmitter.emitRuntimeTypeSupport(mainBuffer, mainOutputUnit);
-    interceptorEmitter.emitGetInterceptorMethods(mainBuffer);
-    interceptorEmitter.emitOneShotInterceptors(mainBuffer);
-
-    if (task.outputContainsConstantList) {
-      emitMakeConstantList(mainBuffer);
-    }
-
-    // Constants in checked mode call into RTI code to set type information
-    // which may need getInterceptor (and one-shot interceptor) methods, so
-    // we have to make sure that [emitGetInterceptorMethods] and
-    // [emitOneShotInterceptors] have been called.
-    emitCompileTimeConstants(mainBuffer, mainOutputUnit);
-
-    emitDeferredBoilerPlate(mainBuffer, deferredLoadHashes);
-
-    // Static field initializations require the classes and compile-time
-    // constants to be set up.
-    emitStaticNonFinalFieldInitializations(mainBuffer);
-    interceptorEmitter.emitInterceptedNames(mainBuffer);
-    interceptorEmitter.emitMapTypeToInterceptor(mainBuffer);
-    emitLazilyInitializedStaticFields(mainBuffer);
-
-    mainBuffer.writeln();
-    mainBuffer.add(nativeBuffer);
-
-    metadataEmitter.emitMetadata(mainBuffer);
-
-    isolateProperties = isolatePropertiesName;
-    // The following code should not use the short-hand for the
-    // initialStatics.
-    mainBuffer.add('${namer.currentIsolate}$_=${_}null$N');
-
-    emitFinishIsolateConstructorInvocation(mainBuffer);
-    mainBuffer.add(
-        '${namer.currentIsolate}$_=${_}new ${namer.isolateName}()$N');
-
-    emitConvertToFastObjectFunction();
-    for (String globalObject in Namer.reservedGlobalObjectNames) {
-      mainBuffer.add('$globalObject = convertToFastObject($globalObject)$N');
-    }
-    if (DEBUG_FAST_OBJECTS) {
-      mainBuffer.add(r'''
-          // The following only works on V8 when run with option
-          // "--allow-natives-syntax".  We use'new Function' because the
-          // miniparser does not understand V8 native syntax.
-          if (typeof print === "function") {
-            var HasFastProperties =
-              new Function("a", "return %HasFastProperties(a)");
-            print("Size of global helper object: "
-                   + String(Object.getOwnPropertyNames(H).length)
-                   + ", fast properties " + HasFastProperties(H));
-            print("Size of global platform object: "
-                   + String(Object.getOwnPropertyNames(P).length)
-                   + ", fast properties " + HasFastProperties(P));
-            print("Size of global dart:html object: "
-                   + String(Object.getOwnPropertyNames(W).length)
-                   + ", fast properties " + HasFastProperties(W));
-            print("Size of isolate properties object: "
-                   + String(Object.getOwnPropertyNames($).length)
-                   + ", fast properties " + HasFastProperties($));
-           print("Size of constant object: "
-                   + String(Object.getOwnPropertyNames(C).length)
-                   + ", fast properties " + HasFastProperties(C));
-           var names = Object.getOwnPropertyNames($);
-           for (var i = 0; i < names.length; i++) {
-             print("$." + names[i]);
-           }
-         }
-''');
-      for (String object in Namer.userGlobalObjects) {
-      mainBuffer.add('''
-        if (typeof print === "function") {
-           print("Size of $object: "
-                 + String(Object.getOwnPropertyNames($object).length)
-                 + ", fast properties " + HasFastProperties($object));
-}
-''');
-      }
-    }
-
-    jsAst.FunctionDeclaration precompiledFunctionAst =
-        buildCspPrecompiledFunctionFor(mainOutputUnit);
-    emitInitFunction(mainBuffer);
-    emitMain(mainBuffer);
-    mainBuffer.add('})()\n');
-
-    if (compiler.useContentSecurityPolicy) {
-      mainBuffer.write(
-          jsAst.prettyPrint(
-              precompiledFunctionAst,
-              compiler,
-              monitor: compiler.dumpInfoTask,
-              allowVariableMinification: false).getText());
-    }
-
-    String assembledCode = mainBuffer.getText();
-    if (generateSourceMap) {
-      outputSourceMap(assembledCode, mainBuffer, '',
-          compiler.sourceMapUri, compiler.outputUri);
-      mainBuffer.add(
-          generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri));
-      assembledCode = mainBuffer.getText();
-    }
-
-    compiler.outputProvider('', 'js')
-        ..add(assembledCode)
-        ..close();
-    compiler.assembledCode = assembledCode;
-
-    if (!compiler.useContentSecurityPolicy) {
-      CodeBuffer cspBuffer = new CodeBuffer();
-      cspBuffer.add(mainBuffer);
-      cspBuffer.write("""
-{
-  var message =
-      'Deprecation: Automatic generation of output for Content Security\\n' +
-      'Policy is deprecated and will be removed with the next development\\n' +
-      'release. Use the --csp option to generate CSP restricted output.';
-  if (typeof dartPrint == "function") {
-    dartPrint(message);
-  } else if (typeof console == "object" && typeof console.log == "function") {
-    console.log(message);
-  } else if (typeof print == "function") {
-    print(message);
-  }
-}\n""");
-
-      cspBuffer.write(
-          jsAst.prettyPrint(
-              precompiledFunctionAst, compiler,
-              allowVariableMinification: false).getText());
-
-      compiler.outputProvider('', 'precompiled.js')
-          ..add(cspBuffer.getText())
-          ..close();
-    }
-  }
-
-  /// Returns a map from OutputUnit to a hash of its content. The hash uniquely
-  /// identifies the code of the output-unit. It does not include
-  /// boilerplate JS code, like the sourcemap directives or the hash
-  /// itself.
-  Map<OutputUnit, String> emitDeferredOutputUnits() {
-    if (!compiler.deferredLoadTask.isProgramSplit) return const {};
-
-    Map<OutputUnit, CodeBuffer> outputBuffers =
-        new Map<OutputUnit, CodeBuffer>();
-
-    for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {
-      if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) continue;
-
-      List<Element> functions = task.outputStaticLists[outputUnit];
-      if (functions != null) {
-        emitStaticFunctions(functions);
-      }
-
-      List<ClassElement> classes = task.outputClassLists[outputUnit];
-      if (classes != null) {
-        for (ClassElement element in classes) {
-          generateClass(element, getElementDescriptor(element));
-        }
-      }
-
-      if (elementDescriptors.isNotEmpty) {
-        Iterable<LibraryElement> libraries =
-            task.outputLibraryLists[outputUnit];
-        if (libraries == null) libraries = [];
-        emitLibraries(libraries);
-
-        CodeBuffer buffer = new CodeBuffer();
-        outputBuffers[outputUnit] = buffer;
-        for (LibraryElement library in Elements.sortedByPosition(libraries)) {
-          writeLibraryDescriptors(buffer, library);
-          elementDescriptors.remove(library);
-        }
-      }
-    }
-
-    return emitDeferredCode(outputBuffers);
-  }
-
-  CodeBuffer buildNativesBuffer() {
-    // Emit native classes on [nativeBuffer].
-    final CodeBuffer nativeBuffer = new CodeBuffer();
-
-    if (nativeClasses.isEmpty) return nativeBuffer;
-
-
-    addComment('Native classes', nativeBuffer);
-
-    nativeEmitter.generateNativeClasses(nativeClasses, mainBuffer,
-        additionalProperties);
-
-    nativeEmitter.finishGenerateNativeClasses();
-    nativeEmitter.assembleCode(nativeBuffer);
-
-    return nativeBuffer;
-  }
-
-  void emitProgram(Program program) {
-    // Shorten the code by using [namer.currentIsolate] as temporary.
-    isolateProperties = namer.currentIsolate;
-
-    classesCollector = r"$$";
-
-    // Emit deferred units first, so we have their hashes.
-    // Map from OutputUnit to a hash of its content. The hash uniquely
-    // identifies the code of the output-unit. It does not include
-    // boilerplate JS code, like the sourcemap directives or the hash
-    // itself.
-    Map<OutputUnit, String> deferredLoadHashes = emitDeferredOutputUnits();
-    CodeBuffer nativeBuffer = buildNativesBuffer();
-    emitMainOutputUnit(deferredLoadHashes, nativeBuffer);
-
-    if (backend.requiresPreamble &&
-        !backend.htmlLibraryIsLoaded) {
-      compiler.reportHint(NO_LOCATION_SPANNABLE, MessageKind.PREAMBLE);
-    }
-  }
-
-  String generateSourceMapTag(Uri sourceMapUri, Uri fileUri) {
-    if (sourceMapUri != null && fileUri != null) {
-      String sourceMapFileName = relativize(fileUri, sourceMapUri, false);
-      return '''
-
-//# sourceMappingURL=$sourceMapFileName
-''';
-    }
-    return '';
-  }
-
-  ClassBuilder getElementDescriptor(Element element) {
-    Element owner = element.library;
-    if (!element.isLibrary && !element.isTopLevel && !element.isNative) {
-      // For static (not top level) elements, record their code in a buffer
-      // specific to the class. For now, not supported for native classes and
-      // native elements.
-      ClassElement cls =
-          element.enclosingClassOrCompilationUnit.declaration;
-      if (compiler.codegenWorld.directlyInstantiatedClasses.contains(cls)
-          && !cls.isNative) {
-        owner = cls;
-      }
-    }
-    if (owner == null) {
-      compiler.internalError(element, 'Owner is null.');
-    }
-    return elementDescriptors.putIfAbsent(
-        owner,
-        () => new ClassBuilder(owner, namer));
-  }
-
-  /// Emits support-code for deferred loading into [buffer].
-  void emitDeferredBoilerPlate(CodeBuffer buffer,
-                               Map<OutputUnit, String> deferredLoadHashes) {
-    // Function for checking if a hunk is loaded given its hash.
-    buffer.write(jsAst.prettyPrint(
-        js('# = function(hunkHash) {'
-           '  return !!$deferredInitializers[hunkHash];'
-           '}', generateEmbeddedGlobalAccess(embeddedNames.IS_HUNK_LOADED)),
-        compiler, monitor: compiler.dumpInfoTask));
-    buffer.write('$N');
-    // Function for initializing a loaded hunk, given its hash.
-    buffer.write(jsAst.prettyPrint(
-        js('# = function(hunkHash) {'
-           '  $deferredInitializers[hunkHash]('
-                '$globalsHolder, ${namer.currentIsolate})'
-           '}',
-           generateEmbeddedGlobalAccess(
-               embeddedNames.INITIALIZE_LOADED_HUNK)),
-        compiler, monitor: compiler.dumpInfoTask));
-    buffer.write('$N');
-    // Write a javascript mapping from Deferred import load ids (derrived
-    // from the import prefix.) to a list of lists of uris of hunks to load,
-    // and a corresponding mapping to a list of hashes used by
-    // INITIALIZE_LOADED_HUNK and IS_HUNK_LOADED.
-    Map<String, List<String>> deferredLibraryUris =
-        new Map<String, List<String>>();
-    Map<String, List<String>> deferredLibraryHashes =
-        new Map<String, List<String>>();
-    compiler.deferredLoadTask.hunksToLoad.forEach(
-                  (String loadId, List<OutputUnit>outputUnits) {
-      List<String> uris = new List<String>();
-      List<String> hashes = new List<String>();
-      deferredLibraryHashes[loadId] = new List<String>();
-      for (OutputUnit outputUnit in outputUnits) {
-        uris.add(deferredPartFileName(outputUnit));
-        hashes.add(deferredLoadHashes[outputUnit]);
-      }
-
-      deferredLibraryUris[loadId] = uris;
-      deferredLibraryHashes[loadId] = hashes;
-    });
-
-    void emitMapping(String name, Map<String, List<String>> mapping) {
-      List<jsAst.Property> properties = new List<jsAst.Property>();
-      mapping.forEach((String key, List<String> values) {
-        properties.add(new jsAst.Property(js.escapedString(key),
-            new jsAst.ArrayInitializer.from(
-                values.map(js.escapedString))));
-      });
-      jsAst.Node initializer =
-          new jsAst.ObjectInitializer(properties, isOneLiner: true);
-
-      jsAst.Node globalName = generateEmbeddedGlobalAccess(name);
-      buffer.write(jsAst.prettyPrint(
-          js("# = #", [globalName, initializer]),
-          compiler, monitor: compiler.dumpInfoTask));
-      buffer.write('$N');
-
-    }
-
-    emitMapping(embeddedNames.DEFERRED_LIBRARY_URIS, deferredLibraryUris);
-    emitMapping(embeddedNames.DEFERRED_LIBRARY_HASHES,
-                deferredLibraryHashes);
-  }
-
-  /// Emits code for all output units except the main.
-  /// Returns a mapping from outputUnit to a hash of the corresponding hunk that
-  /// can be used for calling the initializer.
-  Map<OutputUnit, String> emitDeferredCode(
-      Map<OutputUnit, CodeBuffer> deferredBuffers) {
-
-    Map<OutputUnit, String> hunkHashes = new Map<OutputUnit, String>();
-
-    for (OutputUnit outputUnit in compiler.deferredLoadTask.allOutputUnits) {
-      if (outputUnit == compiler.deferredLoadTask.mainOutputUnit) continue;
-
-      CodeBuffer libraryDescriptorBuffer = deferredBuffers[outputUnit];
-
-      CodeBuffer outputBuffer = new CodeBuffer();
-
-      outputBuffer..write(buildGeneratedBy())
-        ..write('${deferredInitializers}.current$_=$_'
-                'function$_(${globalsHolder}) {$N');
-      for (String globalObject in Namer.reservedGlobalObjectNames) {
-        outputBuffer
-            .write('var $globalObject$_=$_'
-                   '${globalsHolder}.$globalObject$N');
-      }
-      outputBuffer
-          ..write('var init$_=$_${globalsHolder}.init$N')
-          ..write('var ${namer.isolateName}$_=$_'
-                    '${globalsHolder}.${namer.isolateName}$N');
-      if (libraryDescriptorBuffer != null) {
-      // TODO(ahe): This defines a lot of properties on the
-      // Isolate.prototype object.  We know this will turn it into a
-      // slow object in V8, so instead we should do something similar
-      // to Isolate.$finishIsolateConstructor.
-         outputBuffer
-           ..write('var ${namer.currentIsolate}$_=$_$isolatePropertiesName$N')
-           // The classesCollector object ($$).
-           ..write('$classesCollector$_=${_}Object.create(null);$n')
-           ..write('(')
-           ..write(
-               jsAst.prettyPrint(
-                   getReflectionDataParser(classesCollector, backend),
-                   compiler, monitor: compiler.dumpInfoTask))
-           ..write(')')
-           ..write('([$n')
-           ..addBuffer(libraryDescriptorBuffer)
-           ..write('])$N');
-
-        if (outputClassLists.containsKey(outputUnit)) {
-          outputBuffer.write(
-              '$finishClassesName($classesCollector,$_${namer.currentIsolate},'
-              '$_$isolatePropertiesName)$N');
-        }
-
-      }
-
-      // Set the currentIsolate variable to the current isolate (which is
-      // provided as second argument).
-      // We need to do this, because we use the same variable for setting up
-      // the isolate-properties and for storing the current isolate. During
-      // the setup (the code above this lines) we must set the variable to
-      // the isolate-properties.
-      // After we have done the setup (finishing with `finishClasses`) it must
-      // point to the current Isolate. Otherwise all methods/functions
-      // accessing isolate variables will access the wrong object.
-      outputBuffer.write("${namer.currentIsolate}$_=${_}arguments[1]$N");
-      typeTestEmitter.emitRuntimeTypeSupport(outputBuffer, outputUnit);
-
-      emitCompileTimeConstants(outputBuffer, outputUnit);
-      outputBuffer.write('}$N');
-
-      if (compiler.useContentSecurityPolicy) {
-        jsAst.FunctionDeclaration precompiledFunctionAst =
-            buildCspPrecompiledFunctionFor(outputUnit);
-
-        outputBuffer.write(
-            jsAst.prettyPrint(
-                precompiledFunctionAst, compiler,
-                monitor: compiler.dumpInfoTask,
-                allowVariableMinification: false).getText());
-      }
-
-      // Make a unique hash of the code (before the sourcemaps are added)
-      // This will be used to retrieve the initializing function from the global
-      // variable.
-      String hash = hashOfString(outputBuffer.getText());
-
-      outputBuffer.add('${deferredInitializers}["$hash"]$_=$_'
-                       '${deferredInitializers}.current$N');
-
-      String partPrefix = deferredPartFileName(outputUnit, addExtension: false);
-      if (generateSourceMap) {
-        Uri mapUri, partUri;
-        Uri sourceMapUri = compiler.sourceMapUri;
-        Uri outputUri = compiler.outputUri;
-
-        String partName = "$partPrefix.part";
-
-        if (sourceMapUri != null) {
-          String mapFileName = partName + ".js.map";
-          List<String> mapSegments = sourceMapUri.pathSegments.toList();
-          mapSegments[mapSegments.length - 1] = mapFileName;
-          mapUri = compiler.sourceMapUri.replace(pathSegments: mapSegments);
-        }
-
-        if (outputUri != null) {
-          String partFileName = partName + ".js";
-          List<String> partSegments = outputUri.pathSegments.toList();
-          partSegments[partSegments.length - 1] = partFileName;
-          partUri = compiler.outputUri.replace(pathSegments: partSegments);
-        }
-
-        outputSourceMap(outputBuffer.getText(), outputBuffer, partName,
-            mapUri, partUri);
-        outputBuffer.add(generateSourceMapTag(mapUri, partUri));
-      }
-
-      outputBuffers[outputUnit] = outputBuffer;
-      compiler.outputProvider(partPrefix, 'part.js')
-        ..add(outputBuffer.getText())
-        ..close();
-
-      hunkHashes[outputUnit] = hash;
-    }
-    return hunkHashes;
-  }
-
-  String buildGeneratedBy() {
-    var suffix = '';
-    if (compiler.hasBuildId) suffix = ' version: ${compiler.buildId}';
-    return '// Generated by dart2js, the Dart to JavaScript compiler$suffix.\n';
-  }
-
-  void outputSourceMap(String code, CodeBuffer buffer, String name,
-                       [Uri sourceMapUri, Uri fileUri]) {
-    if (!generateSourceMap) return;
-    // Create a source file for the compilation output. This allows using
-    // [:getLine:] to transform offsets to line numbers in [SourceMapBuilder].
-    SourceFile compiledFile = new StringSourceFile(null, code);
-    SourceMapBuilder sourceMapBuilder =
-            new SourceMapBuilder(sourceMapUri, fileUri, compiledFile);
-    buffer.forEachSourceLocation(sourceMapBuilder.addMapping);
-    String sourceMap = sourceMapBuilder.build();
-    compiler.outputProvider(name, 'js.map')
-        ..add(sourceMap)
-        ..close();
-  }
-
-  void invalidateCaches() {
-    if (!compiler.hasIncrementalSupport) return;
-    if (cachedElements.isEmpty) return;
-    for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
-      if (element.isInstanceMember) {
-        cachedClassBuilders.remove(element.enclosingClass);
-
-        nativeEmitter.cachedBuilders.remove(element.enclosingClass);
-
-      }
-    }
-  }
-}