Remove 'serializeLibrary(LibraryElement)' and its tests.

pkg/analyzer/lib/src/summary/summarize_elements.dart

Index: pkg/analyzer/lib/src/summary/summarize_elements.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_elements.dart b/pkg/analyzer/lib/src/summary/summarize_elements.dart
index 0662111707aa88523ff98891ecf84a9417dbef11..2af7bde3826bb4dbcb9a4a9f50fb8ad33096f14f 100644
--- a/pkg/analyzer/lib/src/summary/summarize_elements.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_elements.dart
@@ -6,113 +6,15 @@ library serialization.elements;
 
 import 'dart:convert';
 
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/type.dart';
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/dart/element/member.dart';
-import 'package:analyzer/src/dart/element/type.dart';
-import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/api_signature.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
-import 'package:analyzer/src/summary/name_filter.dart';
 import 'package:analyzer/src/summary/package_bundle_reader.dart';
-import 'package:analyzer/src/summary/summarize_const_expr.dart';
 import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 
 /**
- * Serialize all the elements in [lib] to a summary using [ctx] as the context
- * for building the summary, and using [typeProvider] to find built-in types.
- */
-LibrarySerializationResult serializeLibrary(
-    LibraryElement lib, TypeProvider typeProvider, bool strongMode) {
-  _LibrarySerializer serializer =
-      new _LibrarySerializer(lib, typeProvider, strongMode);
-  LinkedLibraryBuilder linked = serializer.serializeLibrary();
-  return new LibrarySerializationResult(linked, serializer.unlinkedUnits,
-      serializer.unitUris, serializer.unitSources);
-}
-
-ReferenceKind _getReferenceKind(Element element) {
-  if (element == null ||
-      element is ClassElement ||
-      element is DynamicElementImpl) {
-    return ReferenceKind.classOrEnum;
-  } else if (element is ConstructorElement) {
-    return ReferenceKind.constructor;
-  } else if (element is FunctionElement) {
-    if (element.enclosingElement is CompilationUnitElement) {
-      return ReferenceKind.topLevelFunction;
-    }
-    return ReferenceKind.function;
-  } else if (element is FunctionTypeAliasElement) {
-    return ReferenceKind.typedef;
-  } else if (element is PropertyAccessorElement) {
-    if (element.enclosingElement is ClassElement) {
-      return ReferenceKind.propertyAccessor;
-    }
-    return ReferenceKind.topLevelPropertyAccessor;
-  } else if (element is MethodElement) {
-    return ReferenceKind.method;
-  } else if (element is TopLevelVariableElement) {
-    // Summaries don't need to distinguish between references to a variable and
-    // references to its getter.
-    return ReferenceKind.topLevelPropertyAccessor;
-  } else if (element is LocalVariableElement) {
-    return ReferenceKind.variable;
-  } else if (element is FieldElement) {
-    // Summaries don't need to distinguish between references to a field and
-    // references to its getter.
-    return ReferenceKind.propertyAccessor;
-  } else {
-    throw new Exception('Unexpected element kind: ${element.runtimeType}');
-  }
-}
-
-/**
- * Type of closures used by [_LibrarySerializer] to defer generation of
- * [EntityRefBuilder] objects until the end of serialization of a
- * compilation unit.
- */
-typedef EntityRefBuilder _SerializeTypeRef();
-
-/**
- * Data structure holding the result of serializing a [LibraryElement].
- */
-class LibrarySerializationResult {
-  /**
-   * Linked information the given library.
-   */
-  final LinkedLibraryBuilder linked;
-
-  /**
-   * Unlinked information for the compilation units constituting the library.
-   * The zeroth entry in the list is the defining compilation unit; the
-   * remaining entries are the parts, in the order listed in the defining
-   * compilation unit's part declarations.
-   */
-  final List<UnlinkedUnitBuilder> unlinkedUnits;
-
-  /**
-   * Absolute URI of each compilation unit appearing in the library.
-   */
-  final List<String> unitUris;
-
-  /**
-   * Source object corresponding to each compilation unit appearing in the
-   * library.
-   */
-  final List<Source> unitSources;
-
-  LibrarySerializationResult(
-      this.linked, this.unlinkedUnits, this.unitUris, this.unitSources);
-}
-
-/**
  * Object that gathers information uses it to assemble a new
  * [PackageBundleBuilder].
  */
@@ -196,28 +98,6 @@ class PackageBundleAssembler {
   }
 
   /**
-   * Serialize the library with the given [element].
-   */
-  void serializeLibraryElement(LibraryElement element) {
-    String uri = element.source.uri.toString();
-    LibrarySerializationResult libraryResult = serializeLibrary(
-        element,
-        element.context.typeProvider,
-        element.context.analysisOptions.strongMode);
-    _linkedLibraryUris.add(uri);
-    _linkedLibraries.add(libraryResult.linked);
-    _unlinkedUnitUris.addAll(libraryResult.unitUris);
-    _unlinkedUnits.addAll(libraryResult.unlinkedUnits);
-    for (int i = 0; i < libraryResult.unitUris.length; i++) {
-      _unlinkedUnitMap[libraryResult.unitUris[i]] =
-          libraryResult.unlinkedUnits[i];
-    }
-    for (Source source in libraryResult.unitSources) {
-      _unlinkedUnitHashes?.add(_hash(source.contents.data));
-    }
-  }
-
-  /**
    * Compute the API signature for this package bundle.
    */
   String _computeApiSignature() {
@@ -236,1458 +116,3 @@ class PackageBundleAssembler {
     return hex.encode(md5.convert(UTF8.encode(contents)).bytes);
   }
 }
-
-/**
- * Instances of this class keep track of intermediate state during
- * serialization of a single compilation unit.
- */
-class _CompilationUnitSerializer {
-  /**
-   * The [_LibrarySerializer] which is serializing the library of which
-   * [compilationUnit] is a part.
-   */
-  final _LibrarySerializer librarySerializer;
-
-  /**
-   * The [CompilationUnitElement] being serialized.
-   */
-  final CompilationUnitElement compilationUnit;
-
-  /**
-   * The ordinal index of [compilationUnit] within the library, where 0
-   * represents the defining compilation unit.
-   */
-  final int unitNum;
-
-  /**
-   * The final linked summary of the compilation unit.
-   */
-  final LinkedUnitBuilder linkedUnit = new LinkedUnitBuilder();
-
-  /**
-   * The final unlinked summary of the compilation unit.
-   */
-  final UnlinkedUnitBuilder unlinkedUnit = new UnlinkedUnitBuilder();
-
-  /**
-   * Absolute URI of the compilation unit.
-   */
-  String unitUri;
-
-  /**
-   * Map from [Element] to the index of the entry in the "references table"
-   * that refers to it.
-   */
-  final Map<Element, int> referenceMap = <Element, int>{};
-
-  /**
-   * The unlinked portion of the "references table".  This is the list of
-   * objects which should be written to [UnlinkedUnit.references].
-   */
-  List<UnlinkedReferenceBuilder> unlinkedReferences;
-
-  /**
-   * The linked portion of the "references table".  This is the list of
-   * objects which should be written to [LinkedUnit.references].
-   */
-  List<LinkedReferenceBuilder> linkedReferences;
-
-  /**
-   * The number of slot ids which have been assigned to this compilation unit.
-   */
-  int numSlots = 0;
-
-  /**
-   * List of closures which should be invoked at the end of serialization of a
-   * compilation unit, to produce [LinkedUnit.types].
-   */
-  final List<_SerializeTypeRef> deferredLinkedTypes = <_SerializeTypeRef>[];
-
-  /**
-   * List which should be stored in [LinkedUnit.constCycles].
-   */
-  final List<int> constCycles = <int>[];
-
-  /**
-   * Index into the "references table" representing an unresolved reference, if
-   * such an index exists.  `null` if no such entry has been made in the
-   * references table yet.
-   */
-  int unresolvedReferenceIndex = null;
-
-  /**
-   * Index into the "references table" representing the "bottom" type, if such
-   * an index exists.  `null` if no such entry has been made in the references
-   * table yet.
-   */
-  int bottomReferenceIndex = null;
-
-  /**
-   * If `true`, we are currently generating linked references, so new
-   * references will be not stored in [unlinkedReferences].
-   */
-  bool buildingLinkedReferences = false;
-
-  _CompilationUnitSerializer(
-      this.librarySerializer, this.compilationUnit, this.unitNum);
-
-  /**
-   * Source object for the compilation unit.
-   */
-  Source get unitSource => compilationUnit.source;
-
-  /**
-   * Add all classes, enums, typedefs, executables, and top level variables
-   * from the given compilation unit [element] to the compilation unit summary.
-   * [unitNum] indicates the ordinal position of this compilation unit in the
-   * library.
-   */
-  void addCompilationUnitElements() {
-    unlinkedReferences = <UnlinkedReferenceBuilder>[
-      new UnlinkedReferenceBuilder()
-    ];
-    linkedReferences = <LinkedReferenceBuilder>[
-      new LinkedReferenceBuilder(kind: ReferenceKind.unresolved)
-    ];
-    List<UnlinkedPublicNameBuilder> names = <UnlinkedPublicNameBuilder>[];
-    for (PropertyAccessorElement accessor in compilationUnit.accessors) {
-      if (accessor.isPublic) {
-        names.add(new UnlinkedPublicNameBuilder(
-            kind: ReferenceKind.topLevelPropertyAccessor,
-            name: accessor.name,
-            numTypeParameters: accessor.typeParameters.length));
-      }
-    }
-    for (ClassElement cls in compilationUnit.types) {
-      if (cls.isPublic) {
-        names.add(new UnlinkedPublicNameBuilder(
-            kind: ReferenceKind.classOrEnum,
-            name: cls.name,
-            numTypeParameters: cls.typeParameters.length,
-            members: serializeClassStaticMembers(cls)));
-      }
-    }
-    for (ClassElement enm in compilationUnit.enums) {
-      if (enm.isPublic) {
-        names.add(new UnlinkedPublicNameBuilder(
-            kind: ReferenceKind.classOrEnum,
-            name: enm.name,
-            members: serializeClassStaticMembers(enm)));
-      }
-    }
-    for (FunctionElement function in compilationUnit.functions) {
-      if (function.isPublic) {
-        names.add(new UnlinkedPublicNameBuilder(
-            kind: ReferenceKind.topLevelFunction,
-            name: function.name,
-            numTypeParameters: function.typeParameters.length));
-      }
-    }
-    for (FunctionTypeAliasElement typedef
-        in compilationUnit.functionTypeAliases) {
-      if (typedef.isPublic) {
-        names.add(new UnlinkedPublicNameBuilder(
-            kind: ReferenceKind.typedef,
-            name: typedef.name,
-            numTypeParameters: typedef.typeParameters.length));
-      }
-    }
-    if (unitNum == 0) {
-      LibraryElement libraryElement = librarySerializer.libraryElement;
-      if (libraryElement.name.isNotEmpty) {
-        LibraryElement libraryElement = librarySerializer.libraryElement;
-        unlinkedUnit.libraryName = libraryElement.name;
-        unlinkedUnit.libraryNameOffset = libraryElement.nameOffset;
-        unlinkedUnit.libraryNameLength = libraryElement.nameLength;
-        unlinkedUnit.libraryDocumentationComment =
-            serializeDocumentation(libraryElement);
-        unlinkedUnit.libraryAnnotations = serializeAnnotations(libraryElement);
-      }
-      unlinkedUnit.publicNamespace = new UnlinkedPublicNamespaceBuilder(
-          exports: libraryElement.exports.map(serializeExportPublic).toList(),
-          parts: libraryElement.parts
-              .map((CompilationUnitElement e) => e.uri)
-              .toList(),
-          names: names);
-      unlinkedUnit.exports =
-          libraryElement.exports.map(serializeExportNonPublic).toList();
-      unlinkedUnit.imports =
-          libraryElement.imports.map(serializeImport).toList();
-      unlinkedUnit.parts = libraryElement.parts
-          .map((CompilationUnitElement e) => new UnlinkedPartBuilder(
-              uriOffset: e.uriOffset,
-              uriEnd: e.uriEnd,
-              annotations: serializeAnnotations(e)))
-          .toList();
-    } else {
-      // TODO(paulberry): we need to figure out a way to record library, part,
-      // import, and export declarations that appear in non-defining
-      // compilation units (even though such declarations are prohibited by the
-      // language), so that if the user makes code changes that cause a
-      // non-defining compilation unit to become a defining compilation unit,
-      // we can create a correct summary by simply re-linking.
-      unlinkedUnit.publicNamespace =
-          new UnlinkedPublicNamespaceBuilder(names: names);
-    }
-    unlinkedUnit.codeRange = serializeCodeRange(compilationUnit);
-    unlinkedUnit.classes = compilationUnit.types.map(serializeClass).toList();
-    unlinkedUnit.enums = compilationUnit.enums.map(serializeEnum).toList();
-    unlinkedUnit.typedefs =
-        compilationUnit.functionTypeAliases.map(serializeTypedef).toList();
-    List<UnlinkedExecutableBuilder> executables =
-        compilationUnit.functions.map(serializeExecutable).toList();
-    for (PropertyAccessorElement accessor in compilationUnit.accessors) {
-      if (!accessor.isSynthetic) {
-        executables.add(serializeExecutable(accessor));
-      }
-    }
-    unlinkedUnit.executables = executables;
-    List<UnlinkedVariableBuilder> variables = <UnlinkedVariableBuilder>[];
-    for (PropertyAccessorElement accessor in compilationUnit.accessors) {
-      if (accessor.isSynthetic && accessor.isGetter) {
-        PropertyInducingElement variable = accessor.variable;
-        if (variable != null) {
-          assert(!variable.isSynthetic);
-          variables.add(serializeVariable(variable));
-        }
-      }
-    }
-    unlinkedUnit.variables = variables;
-    unlinkedUnit.references = unlinkedReferences;
-    unlinkedUnit.lineStarts =
-        compilationUnit.context?.computeLineInfo(unitSource)?.lineStarts;
-    linkedUnit.references = linkedReferences;
-    unitUri = compilationUnit.source.uri.toString();
-  }
-
-  /**
-   * Create the [LinkedUnit.types] table based on deferred types that were
-   * found during [addCompilationUnitElements].  Also populate
-   * [LinkedUnit.constCycles].
-   */
-  void createLinkedInfo() {
-    buildingLinkedReferences = true;
-    linkedUnit.types = deferredLinkedTypes
-        .map((_SerializeTypeRef closure) => closure())
-        .toList();
-    linkedUnit.constCycles = constCycles;
-    buildingLinkedReferences = false;
-  }
-
-  /**
-   * Compute the appropriate De Bruijn index to represent the given type
-   * parameter [type], or return `null` if the type parameter is not in scope.
-   */
-  int findTypeParameterIndex(TypeParameterType type, Element context) {
-    int index = 0;
-    while (context != null) {
-      List<TypeParameterElement> typeParameters;
-      if (context is ClassElement) {
-        typeParameters = context.typeParameters;
-      } else if (context is FunctionTypeAliasElement) {
-        typeParameters = context.typeParameters;
-      } else if (context is ExecutableElement) {
-        typeParameters = context.typeParameters;
-      }
-      if (typeParameters != null) {
-        for (int i = 0; i < typeParameters.length; i++) {
-          TypeParameterElement param = typeParameters[i];
-          if (param == type.element) {
-            return index + typeParameters.length - i;
-          }
-        }
-        index += typeParameters.length;
-      }
-      context = context.enclosingElement;
-    }
-    return null;
-  }
-
-  /**
-   * Get the type arguments for the given [type], or `null` if the type has no
-   * type arguments.
-   *
-   * TODO(paulberry): consider adding an abstract getter to [DartType] to do
-   * this.
-   */
-  List<DartType> getTypeArguments(DartType type) {
-    if (type is InterfaceType) {
-      return type.typeArguments;
-    } else if (type is FunctionType) {
-      return type.typeArguments;
-    } else {
-      return null;
-    }
-  }
-
-  /**
-   * Serialize annotations from the given [element].  If [element] has no
-   * annotations, the empty list is returned.
-   */
-  List<UnlinkedConstBuilder> serializeAnnotations(Element element) {
-    if (element.metadata.isEmpty) {
-      return const <UnlinkedConstBuilder>[];
-    }
-    return element.metadata.map((ElementAnnotation a) {
-      _ConstExprSerializer serializer =
-          new _ConstExprSerializer(this, element, null, null);
-      serializer
-          .serializeAnnotation((a as ElementAnnotationImpl).annotationAst);
-      return serializer.toBuilder();
-    }).toList();
-  }
-
-  /**
-   * Return the index of the entry in the references table
-   * ([LinkedLibrary.references]) used for the "bottom" type.  A new entry is
-   * added to the table if necessary to satisfy the request.
-   */
-  int serializeBottomReference() {
-    if (bottomReferenceIndex == null) {
-      // References to the "bottom" type are always implicit, since there is no
-      // way to explicitly refer to the "bottom" type.  Therefore they should
-      // be stored only in the linked references table.
-      bottomReferenceIndex = linkedReferences.length;
-      linkedReferences.add(new LinkedReferenceBuilder(
-          name: '*bottom*', kind: ReferenceKind.classOrEnum));
-    }
-    return bottomReferenceIndex;
-  }
-
-  /**
-   * Serialize the given [classElement], creating an [UnlinkedClass].
-   */
-  UnlinkedClassBuilder serializeClass(ClassElement classElement) {
-    UnlinkedClassBuilder b = new UnlinkedClassBuilder();
-    b.name = classElement.name;
-    b.nameOffset = classElement.nameOffset;
-    b.typeParameters =
-        classElement.typeParameters.map(serializeTypeParam).toList();
-    if (classElement.supertype == null) {
-      b.hasNoSupertype = true;
-    } else if (!classElement.supertype.isObject) {
-      b.supertype = serializeTypeRef(classElement.supertype, classElement);
-    }
-    b.mixins = classElement.mixins
-        .map((InterfaceType t) => serializeTypeRef(t, classElement))
-        .toList();
-    b.interfaces = classElement.interfaces
-        .map((InterfaceType t) => serializeTypeRef(t, classElement))
-        .toList();
-    List<UnlinkedVariableBuilder> fields = <UnlinkedVariableBuilder>[];
-    List<UnlinkedExecutableBuilder> executables = <UnlinkedExecutableBuilder>[];
-    for (ConstructorElement executable in classElement.constructors) {
-      if (!executable.isSynthetic) {
-        executables.add(serializeExecutable(executable));
-      }
-    }
-    for (MethodElement executable in classElement.methods) {
-      executables.add(serializeExecutable(executable));
-    }
-    for (PropertyAccessorElement accessor in classElement.accessors) {
-      if (!accessor.isSynthetic) {
-        executables.add(serializeExecutable(accessor));
-      } else if (accessor.isGetter) {
-        PropertyInducingElement field = accessor.variable;
-        if (field != null && !field.isSynthetic) {
-          fields.add(serializeVariable(field));
-        }
-      }
-    }
-    b.fields = fields;
-    b.executables = executables;
-    b.isAbstract = classElement.isAbstract;
-    b.isMixinApplication = classElement.isMixinApplication;
-    b.documentationComment = serializeDocumentation(classElement);
-    b.annotations = serializeAnnotations(classElement);
-    b.codeRange = serializeCodeRange(classElement);
-    return b;
-  }
-
-  /**
-   * If [cls] is a class, return the list of its static members - static
-   * constant fields, static methods and constructors.  Otherwise return `null`.
-   */
-  List<UnlinkedPublicNameBuilder> serializeClassStaticMembers(
-      ClassElement cls) {
-    if (cls.isMixinApplication) {
-      // Mixin application members can't be determined directly from the AST so
-      // we can't store them in UnlinkedPublicName.
-      // TODO(paulberry): find somewhere else to store them.
-      return null;
-    }
-    if (cls.kind == ElementKind.CLASS) {
-      List<UnlinkedPublicNameBuilder> bs = <UnlinkedPublicNameBuilder>[];
-      for (MethodElement method in cls.methods) {
-        if (method.isStatic && method.isPublic) {
-          // TODO(paulberry): should numTypeParameters include class params?
-          bs.add(new UnlinkedPublicNameBuilder(
-              name: method.name,
-              kind: ReferenceKind.method,
-              numTypeParameters: method.typeParameters.length));
-        }
-      }
-      for (PropertyAccessorElement accessor in cls.accessors) {
-        if (accessor.isStatic && accessor.isGetter && accessor.isPublic) {
-          // TODO(paulberry): should numTypeParameters include class params?
-          bs.add(new UnlinkedPublicNameBuilder(
-              name: accessor.name, kind: ReferenceKind.propertyAccessor));
-        }
-      }
-      for (ConstructorElement constructor in cls.constructors) {
-        if (constructor.isPublic && constructor.name.isNotEmpty) {
-          // TODO(paulberry): should numTypeParameters include class params?
-          bs.add(new UnlinkedPublicNameBuilder(
-              name: constructor.name,
-              kind: ReferenceKind.constructor,
-              numTypeParameters: 0));
-        }
-      }
-      return bs;
-    }
-    return null;
-  }
-
-  CodeRangeBuilder serializeCodeRange(Element element) {
-    if (element is ElementImpl && element.codeOffset != null) {
-      return new CodeRangeBuilder(
-          offset: element.codeOffset, length: element.codeLength);
-    }
-    return null;
-  }
-
-  /**
-   * Serialize the given [combinator] into an [UnlinkedCombinator].
-   */
-  UnlinkedCombinatorBuilder serializeCombinator(
-      NamespaceCombinator combinator) {
-    UnlinkedCombinatorBuilder b = new UnlinkedCombinatorBuilder();
-    if (combinator is ShowElementCombinator) {
-      b.shows = combinator.shownNames;
-      b.offset = combinator.offset;
-      b.end = combinator.end;
-    } else if (combinator is HideElementCombinator) {
-      b.hides = combinator.hiddenNames;
-    }
-    return b;
-  }
-
-  /**
-   * Serialize the given [expression], creating an [UnlinkedConstBuilder].
-   */
-  UnlinkedConstBuilder serializeConstExpr(Element context,
-      ExecutableElement executableContext, Expression expression,
-      [Set<String> constructorParameterNames]) {
-    _ConstExprSerializer serializer = new _ConstExprSerializer(
-        this, context, executableContext, constructorParameterNames);
-    serializer.serialize(expression);
-    return serializer.toBuilder();
-  }
-
-  /**
-   * Serialize documentation from the given [element], creating an
-   * [UnlinkedDocumentationComment].
-   *
-   * If [element] has no documentation, `null` is returned.
-   */
-  UnlinkedDocumentationCommentBuilder serializeDocumentation(Element element) {
-    if (element.documentationComment == null) {
-      return null;
-    }
-    return new UnlinkedDocumentationCommentBuilder(
-        text: element.documentationComment);
-  }
-
-  /**
-   * Serialize the given [enumElement], creating an [UnlinkedEnum].
-   */
-  UnlinkedEnumBuilder serializeEnum(ClassElement enumElement) {
-    UnlinkedEnumBuilder b = new UnlinkedEnumBuilder();
-    b.name = enumElement.name;
-    b.nameOffset = enumElement.nameOffset;
-    List<UnlinkedEnumValueBuilder> values = <UnlinkedEnumValueBuilder>[];
-    for (FieldElement field in enumElement.fields) {
-      if (field.isConst && field.type.element == enumElement) {
-        values.add(new UnlinkedEnumValueBuilder(
-            name: field.name,
-            nameOffset: field.nameOffset,
-            documentationComment: serializeDocumentation(field)));
-      }
-    }
-    b.values = values;
-    b.documentationComment = serializeDocumentation(enumElement);
-    b.annotations = serializeAnnotations(enumElement);
-    b.codeRange = serializeCodeRange(enumElement);
-    return b;
-  }
-
-  /**
-   * Serialize the given [executableElement], creating an [UnlinkedExecutable].
-   */
-  UnlinkedExecutableBuilder serializeExecutable(
-      ExecutableElement executableElement) {
-    UnlinkedExecutableBuilder b = new UnlinkedExecutableBuilder();
-    b.name = executableElement.name;
-    b.nameOffset = executableElement.nameOffset;
-    if (executableElement is ConstructorElement) {
-      if (executableElement.name.isNotEmpty) {
-        b.nameEnd = executableElement.nameEnd;
-        b.periodOffset = executableElement.periodOffset;
-      }
-    } else {
-      if (!executableElement.hasImplicitReturnType) {
-        b.returnType = serializeTypeRef(
-            executableElement.type.returnType, executableElement);
-      } else if (!executableElement.isStatic) {
-        b.inferredReturnTypeSlot =
-            storeInferredType(executableElement.returnType, executableElement);
-      }
-    }
-    b.typeParameters =
-        executableElement.typeParameters.map(serializeTypeParam).toList();
-    b.parameters =
-        executableElement.type.parameters.map(serializeParam).toList();
-    if (executableElement is PropertyAccessorElement) {
-      if (executableElement.isGetter) {
-        b.kind = UnlinkedExecutableKind.getter;
-      } else {
-        b.kind = UnlinkedExecutableKind.setter;
-      }
-    } else if (executableElement is ConstructorElementImpl) {
-      b.kind = UnlinkedExecutableKind.constructor;
-      b.isConst = executableElement.isConst;
-      b.isFactory = executableElement.isFactory;
-      ConstructorElement redirectedConstructor =
-          executableElement.redirectedConstructor;
-      if (redirectedConstructor != null) {
-        b.isRedirectedConstructor = true;
-        if (executableElement.isFactory) {
-          InterfaceType returnType = redirectedConstructor is ConstructorMember
-              ? redirectedConstructor.definingType
-              : redirectedConstructor.enclosingElement.type;
-          EntityRefBuilder typeRef =
-              serializeTypeRef(returnType, executableElement);
-          if (redirectedConstructor.name.isNotEmpty) {
-            String name = redirectedConstructor.name;
-            int typeId = typeRef.reference;
-            LinkedReference typeLinkedRef = linkedReferences[typeId];
-            int refId = serializeUnlinkedReference(
-                name, ReferenceKind.constructor,
-                unit: typeLinkedRef.unit, prefixReference: typeId);
-            b.redirectedConstructor = new EntityRefBuilder(
-                reference: refId, typeArguments: typeRef.typeArguments);
-          } else {
-            b.redirectedConstructor = typeRef;
-          }
-        } else {
-          b.redirectedConstructorName = redirectedConstructor.name;
-        }
-      }
-      if (executableElement.isConst) {
-        b.constCycleSlot = storeConstCycle(!executableElement.isCycleFree);
-        if (executableElement.constantInitializers != null) {
-          Set<String> constructorParameterNames =
-              executableElement.parameters.map((p) => p.name).toSet();
-          b.constantInitializers = executableElement.constantInitializers
-              .map((ConstructorInitializer initializer) =>
-                  serializeConstructorInitializer(
-                      initializer,
-                      (expr) => serializeConstExpr(executableElement,
-                          executableElement, expr, constructorParameterNames)))
-              .toList();
-        }
-      }
-    } else {
-      b.kind = UnlinkedExecutableKind.functionOrMethod;
-    }
-    b.isAbstract = executableElement.isAbstract;
-    b.isAsynchronous = executableElement.isAsynchronous;
-    b.isGenerator = executableElement.isGenerator;
-    b.isStatic = executableElement.isStatic &&
-        executableElement.enclosingElement is ClassElement;
-    b.isExternal = executableElement.isExternal;
-    b.documentationComment = serializeDocumentation(executableElement);
-    b.annotations = serializeAnnotations(executableElement);
-    b.codeRange = serializeCodeRange(executableElement);
-    if (executableElement is FunctionElement) {
-      SourceRange visibleRange = executableElement.visibleRange;
-      if (visibleRange != null) {
-        b.visibleOffset = visibleRange.offset;
-        b.visibleLength = visibleRange.length;
-      }
-    }
-    b.localFunctions =
-        executableElement.functions.map(serializeExecutable).toList();
-    b.localLabels = executableElement.labels.map(serializeLabel).toList();
-    b.localVariables =
-        executableElement.localVariables.map(serializeVariable).toList();
-    return b;
-  }
-
-  /**
-   * Serialize the given [exportElement] into an [UnlinkedExportNonPublic].
-   */
-  UnlinkedExportNonPublicBuilder serializeExportNonPublic(
-      ExportElement exportElement) {
-    UnlinkedExportNonPublicBuilder b = new UnlinkedExportNonPublicBuilder();
-    b.offset = exportElement.nameOffset;
-    b.uriOffset = exportElement.uriOffset;
-    b.uriEnd = exportElement.uriEnd;
-    b.annotations = serializeAnnotations(exportElement);
-    return b;
-  }
-
-  /**
-   * Serialize the given [exportElement] into an [UnlinkedExportPublic].
-   */
-  UnlinkedExportPublicBuilder serializeExportPublic(
-      ExportElement exportElement) {
-    UnlinkedExportPublicBuilder b = new UnlinkedExportPublicBuilder();
-    b.uri = exportElement.uri;
-    b.combinators = exportElement.combinators.map(serializeCombinator).toList();
-    return b;
-  }
-
-  /**
-   * Serialize the given [importElement] yielding an [UnlinkedImportBuilder].
-   * Also, add linked information about it to the [linkedImports] list.
-   */
-  UnlinkedImportBuilder serializeImport(ImportElement importElement) {
-    UnlinkedImportBuilder b = new UnlinkedImportBuilder();
-    b.annotations = serializeAnnotations(importElement);
-    b.isDeferred = importElement.isDeferred;
-    b.combinators = importElement.combinators.map(serializeCombinator).toList();
-    if (importElement.prefix != null) {
-      b.prefixReference = serializePrefix(importElement.prefix);
-      b.prefixOffset = importElement.prefix.nameOffset;
-    }
-    if (importElement.isSynthetic) {
-      b.isImplicit = true;
-    } else {
-      b.offset = importElement.nameOffset;
-      b.uri = importElement.uri;
-      b.uriOffset = importElement.uriOffset;
-      b.uriEnd = importElement.uriEnd;
-    }
-    return b;
-  }
-
-  /**
-   * Serialize the given [label], creating an [UnlinkedLabelBuilder].
-   */
-  UnlinkedLabelBuilder serializeLabel(LabelElement label) {
-    LabelElementImpl labelImpl = label as LabelElementImpl;
-    UnlinkedLabelBuilder b = new UnlinkedLabelBuilder();
-    b.name = labelImpl.name;
-    b.nameOffset = labelImpl.nameOffset;
-    b.isOnSwitchMember = labelImpl.isOnSwitchMember;
-    b.isOnSwitchStatement = labelImpl.isOnSwitchStatement;
-    return b;
-  }
-
-  /**
-   * Serialize the given [parameter] into an [UnlinkedParam].
-   */
-  UnlinkedParamBuilder serializeParam(ParameterElement parameter,
-      [Element context]) {
-    context ??= parameter;
-    UnlinkedParamBuilder b = new UnlinkedParamBuilder();
-    b.name = parameter.name;
-    b.nameOffset = parameter.nameOffset >= 0 ? parameter.nameOffset : 0;
-    switch (parameter.parameterKind) {
-      case ParameterKind.REQUIRED:
-        b.kind = UnlinkedParamKind.required;
-        break;
-      case ParameterKind.POSITIONAL:
-        b.kind = UnlinkedParamKind.positional;
-        break;
-      case ParameterKind.NAMED:
-        b.kind = UnlinkedParamKind.named;
-        break;
-    }
-    b.annotations = serializeAnnotations(parameter);
-    b.codeRange = serializeCodeRange(parameter);
-    b.isInitializingFormal = parameter.isInitializingFormal;
-    DartType type = parameter.type;
-    if (parameter.hasImplicitType) {
-      Element contextParent = context.enclosingElement;
-      if (!parameter.isInitializingFormal &&
-          contextParent is ExecutableElement &&
-          !contextParent.isStatic &&
-          contextParent is! ConstructorElement) {
-        b.inferredTypeSlot = storeInferredType(type, context);
-      }
-    } else {
-      if (type is FunctionType && type.element.isSynthetic) {
-        b.isFunctionTyped = true;
-        b.type = serializeTypeRef(type.returnType, parameter);
-        b.parameters = type.parameters
-            .map((parameter) => serializeParam(parameter, context))
-            .toList();
-      } else {
-        b.type = serializeTypeRef(type, context);
-      }
-    }
-    // TODO(scheglov) VariableMember.initializer is not implemented
-    if (parameter is! VariableMember && parameter.initializer != null) {
-      b.initializer = serializeExecutable(parameter.initializer);
-    }
-    if (parameter is ConstVariableElement) {
-      ConstVariableElement constParameter = parameter as ConstVariableElement;
-      Expression initializer = constParameter.constantInitializer;
-      if (initializer != null) {
-        b.initializer?.bodyExpr = serializeConstExpr(
-            parameter,
-            parameter.getAncestor((Element e) => e is ExecutableElement),
-            initializer);
-        b.defaultValueCode = parameter.defaultValueCode;
-      }
-    }
-    {
-      SourceRange visibleRange = parameter.visibleRange;
-      if (visibleRange != null) {
-        b.visibleOffset = visibleRange.offset;
-        b.visibleLength = visibleRange.length;
-      }
-    }
-    return b;
-  }
-
-  /**
-   * Serialize the given [prefix] into an index into the references table.
-   */
-  int serializePrefix(PrefixElement element) {
-    return referenceMap.putIfAbsent(element,
-        () => serializeUnlinkedReference(element.name, ReferenceKind.prefix));
-  }
-
-  /**
-   * Compute the reference index which should be stored in a [EntityRef].
-   */
-  int serializeReferenceForType(DartType type) {
-    Element element = type.element;
-    LibraryElement dependentLibrary = element?.library;
-    if (dependentLibrary == null) {
-      if (type.isBottom) {
-        // References to the "bottom" type are always implicit, since there is
-        // no way to explicitly refer to the "bottom" type.  Therefore they
-        // should always be linked.
-        assert(buildingLinkedReferences);
-        return serializeBottomReference();
-      }
-      assert(type.isDynamic || type.isVoid);
-      if (type is UndefinedTypeImpl) {
-        return serializeUnresolvedReference();
-      }
-      // Note: for a type which is truly `dynamic` or `void`, fall through to
-      // use [_getElementReferenceId].
-    }
-    return _getElementReferenceId(element);
-  }
-
-  /**
-   * Serialize the given [typedefElement], creating an [UnlinkedTypedef].
-   */
-  UnlinkedTypedefBuilder serializeTypedef(
-      FunctionTypeAliasElement typedefElement) {
-    UnlinkedTypedefBuilder b = new UnlinkedTypedefBuilder();
-    b.name = typedefElement.name;
-    b.nameOffset = typedefElement.nameOffset;
-    b.typeParameters =
-        typedefElement.typeParameters.map(serializeTypeParam).toList();
-    b.returnType = serializeTypeRef(typedefElement.returnType, typedefElement);
-    b.parameters = typedefElement.parameters.map(serializeParam).toList();
-    b.documentationComment = serializeDocumentation(typedefElement);
-    b.annotations = serializeAnnotations(typedefElement);
-    b.codeRange = serializeCodeRange(typedefElement);
-    return b;
-  }
-
-  /**
-   * Serialize the given [typeParameter] into an [UnlinkedTypeParam].
-   */
-  UnlinkedTypeParamBuilder serializeTypeParam(
-      TypeParameterElement typeParameter) {
-    UnlinkedTypeParamBuilder b = new UnlinkedTypeParamBuilder();
-    b.name = typeParameter.name;
-    b.nameOffset = typeParameter.nameOffset;
-    if (typeParameter.bound != null) {
-      b.bound = serializeTypeRef(typeParameter.bound, typeParameter);
-    }
-    b.annotations = serializeAnnotations(typeParameter);
-    b.codeRange = serializeCodeRange(typeParameter);
-    return b;
-  }
-
-  /**
-   * Serialize the given [type] into a [EntityRef].  If [slot] is provided,
-   * it should be included in the [EntityRef].
-   *
-   * [context] is the element within which the [EntityRef] will be
-   * interpreted; this is used to serialize type parameters.
-   */
-  EntityRefBuilder serializeTypeRef(DartType type, Element context,
-      {int slot}) {
-    if (slot != null) {
-      assert(buildingLinkedReferences);
-    }
-    EntityRefBuilder b = new EntityRefBuilder(slot: slot);
-    Element typeElement = type.element;
-    if (type is TypeParameterType) {
-      int typeParameterIndex = findTypeParameterIndex(type, context);
-      if (typeParameterIndex != null) {
-        b.paramReference = typeParameterIndex;
-      } else {
-        // Out-of-scope type parameters only occur in circumstances where they
-        // are irrelevant (i.e. when a type parameter is unused).  So we can
-        // safely convert them to `dynamic`.
-        b.reference = serializeReferenceForType(DynamicTypeImpl.instance);
-      }
-    } else if (type is FunctionType &&
-        typeElement is FunctionElement &&
-        typeElement.enclosingElement == null) {
-      b.syntheticReturnType =
-          serializeTypeRef(typeElement.returnType, typeElement);
-      b.syntheticParams = typeElement.parameters
-          .map((ParameterElement param) => serializeParam(param, context))
-          .toList();
-    } else {
-      if (type is FunctionType &&
-          typeElement.enclosingElement is ParameterElement) {
-        // Code cannot refer to function types implicitly defined by parameters
-        // directly, so if we get here, we must be serializing a linked
-        // reference from type inference.
-        assert(buildingLinkedReferences);
-        ParameterElement parameterElement = typeElement.enclosingElement;
-        while (true) {
-          Element parent = parameterElement.enclosingElement;
-          if (parent is ParameterElement) {
-            // Function-typed parameter inside a function-typed parameter.
-            b.implicitFunctionTypeIndices
-                .insert(0, parent.parameters.indexOf(parameterElement));
-            parameterElement = parent;
-            continue;
-          } else if (parent is FunctionTypedElement) {
-            b.implicitFunctionTypeIndices
-                .insert(0, parent.parameters.indexOf(parameterElement));
-            // Function-typed parameter inside a top level function, method, or
-            // typedef.
-            b.reference = _getElementReferenceId(parent);
-            break;
-          } else {
-            throw new StateError(
-                'Unexpected element enclosing parameter: ${parent.runtimeType}');
-          }
-        }
-      } else {
-        b.reference = serializeReferenceForType(type);
-      }
-      List<DartType> typeArguments = getTypeArguments(type);
-      if (typeArguments != null) {
-        b.typeArguments = typeArguments
-            .map((typeArgument) => serializeTypeRef(typeArgument, context))
-            .toList();
-      }
-    }
-    return b;
-  }
-
-  /**
-   * Create a new entry in the references table ([UnlinkedUnit.references]
-   * and [LinkedUnit.references]) representing an entity having the given
-   * [name] and [kind].  If [unit] is given, it is the index of the compilation
-   * unit containing the entity being referred to.  If [prefixReference] is
-   * given, it indicates the entry in the references table for the prefix.
-   */
-  int serializeUnlinkedReference(String name, ReferenceKind kind,
-      {int unit: 0, int prefixReference: 0}) {
-    assert(unlinkedReferences.length == linkedReferences.length);
-    int index = unlinkedReferences.length;
-    unlinkedReferences.add(new UnlinkedReferenceBuilder(
-        name: name, prefixReference: prefixReference));
-    linkedReferences.add(new LinkedReferenceBuilder(kind: kind, unit: unit));
-    return index;
-  }
-
-  /**
-   * Return the index of the entry in the references table
-   * ([UnlinkedLibrary.references] and [LinkedLibrary.references]) used for
-   * unresolved references.  A new entry is added to the table if necessary to
-   * satisfy the request.
-   */
-  int serializeUnresolvedReference() {
-    // TODO(paulberry): in order for relinking to work, we need to record the
-    // name and prefix of the unresolved symbol.  This is not (yet) encoded in
-    // the element model.  For the moment we use a name that can't possibly
-    // ever exist.
-    if (unresolvedReferenceIndex == null) {
-      unresolvedReferenceIndex =
-          serializeUnlinkedReference('*unresolved*', ReferenceKind.unresolved);
-    }
-    return unresolvedReferenceIndex;
-  }
-
-  /**
-   * Serialize the given [variable], creating an [UnlinkedVariable].
-   */
-  UnlinkedVariableBuilder serializeVariable(VariableElement variable) {
-    UnlinkedVariableBuilder b = new UnlinkedVariableBuilder();
-    b.name = variable.name;
-    b.nameOffset = variable.nameOffset;
-    if (!variable.hasImplicitType) {
-      b.type = serializeTypeRef(variable.type, variable);
-    }
-    b.isStatic = variable.isStatic && variable.enclosingElement is ClassElement;
-    b.isFinal = variable.isFinal;
-    b.isConst = variable.isConst;
-    b.documentationComment = serializeDocumentation(variable);
-    b.annotations = serializeAnnotations(variable);
-    // TODO(scheglov) VariableMember.initializer is not implemented
-    if (variable is! VariableMember && variable.initializer != null) {
-      b.initializer = serializeExecutable(variable.initializer);
-    }
-    if (variable is ConstVariableElement) {
-      ConstVariableElement constVariable = variable as ConstVariableElement;
-      Expression initializer = constVariable.constantInitializer;
-      if (initializer != null) {
-        b.initializer?.bodyExpr =
-            serializeConstExpr(variable, variable.initializer, initializer);
-      }
-    }
-    if (variable is PropertyInducingElement) {
-      if (b.isFinal || b.isConst) {
-        b.propagatedTypeSlot =
-            storeLinkedType(variable.propagatedType, variable);
-      } else {
-        // Variable is not propagable.
-        assert(variable.propagatedType == null);
-      }
-    }
-    if (variable.hasImplicitType &&
-        (variable.initializer != null || !variable.isStatic)) {
-      b.inferredTypeSlot = storeInferredType(variable.type, variable);
-    }
-    b.codeRange = serializeCodeRange(variable);
-    if (variable is LocalVariableElement) {
-      SourceRange visibleRange = variable.visibleRange;
-      if (visibleRange != null) {
-        b.visibleOffset = visibleRange.offset;
-        b.visibleLength = visibleRange.length;
-      }
-    }
-    return b;
-  }
-
-  /**
-   * Create a new slot id and return it.  If [hasCycle] is `true`, arrange for
-   * the slot id to be included in [LinkedUnit.constCycles].
-   */
-  int storeConstCycle(bool hasCycle) {
-    int slot = ++numSlots;
-    if (hasCycle) {
-      constCycles.add(slot);
-    }
-    return slot;
-  }
-
-  /**
-   * Create a slot id for the given [type] (which is an inferred type).  If
-   * [type] is not `dynamic`, it is stored in [linkedTypes] so that once the
-   * compilation unit has been fully visited, it will be serialized into
-   * [LinkedUnit.types].
-   *
-   * [context] is the element within which the slot id will appear; this is
-   * used to serialize type parameters.
-   */
-  int storeInferredType(DartType type, Element context) {
-    return storeLinkedType(type.isDynamic ? null : type, context);
-  }
-
-  /**
-   * Create a slot id for the given [type] (which may be either a propagated
-   * type or an inferred type).  If [type] is not `null`, it is stored in
-   * [linkedTypes] so that once the compilation unit has been fully visited,
-   * it will be serialized to [LinkedUnit.types].
-   *
-   * [context] is the element within which the slot id will appear; this is
-   * used to serialize type parameters.
-   */
-  int storeLinkedType(DartType type, Element context) {
-    int slot = ++numSlots;
-    if (type != null) {
-      deferredLinkedTypes
-          .add(() => serializeTypeRef(type, context, slot: slot));
-    }
-    return slot;
-  }
-
-  int _getElementReferenceId(Element element) {
-    return referenceMap.putIfAbsent(element, () {
-      LibraryElement dependentLibrary = librarySerializer.libraryElement;
-      int unit = 0;
-      Element enclosingElement;
-      if (element != null) {
-        enclosingElement = element.enclosingElement;
-        if (enclosingElement is CompilationUnitElement) {
-          dependentLibrary = enclosingElement.library;
-          unit = dependentLibrary.units.indexOf(enclosingElement);
-          assert(unit != -1);
-        }
-      }
-      ReferenceKind kind = _getReferenceKind(element);
-      String name = element == null ? 'void' : element.name;
-      int index;
-      LinkedReferenceBuilder linkedReference;
-      if (buildingLinkedReferences) {
-        linkedReference =
-            new LinkedReferenceBuilder(kind: kind, unit: unit, name: name);
-        if (enclosingElement != null &&
-            enclosingElement is! CompilationUnitElement) {
-          linkedReference.containingReference =
-              _getElementReferenceId(enclosingElement);
-          if (enclosingElement is ClassElement) {
-            // Nothing to do.
-          } else if (enclosingElement is ExecutableElement) {
-            if (element is FunctionElement) {
-              assert(enclosingElement.functions.contains(element));
-              linkedReference.localIndex =
-                  enclosingElement.functions.indexOf(element);
-            } else if (element is LocalVariableElement) {
-              assert(enclosingElement.localVariables.contains(element));
-              linkedReference.localIndex =
-                  enclosingElement.localVariables.indexOf(element);
-            } else {
-              throw new StateError(
-                  'Unexpected enclosed element type: ${element.runtimeType}');
-            }
-          } else if (enclosingElement is VariableElement) {
-            assert(identical(enclosingElement.initializer, element));
-          } else {
-            throw new StateError(
-                'Unexpected enclosing element type: ${enclosingElement.runtimeType}');
-          }
-        }
-        index = linkedReferences.length;
-        linkedReferences.add(linkedReference);
-      } else {
-        assert(unlinkedReferences.length == linkedReferences.length);
-        int prefixReference = 0;
-        Element enclosing = element?.enclosingElement;
-        if (enclosing == null || enclosing is CompilationUnitElement) {
-          // Figure out a prefix that may be used to refer to the given element.
-          // TODO(paulberry): to avoid subtle relinking inconsistencies we
-          // should use the actual prefix from the AST (a given type may be
-          // reachable via multiple prefixes), but sadly, this information is
-          // not recorded in the element model.
-          PrefixElement prefix = librarySerializer.prefixMap[element];
-          if (prefix != null) {
-            prefixReference = serializePrefix(prefix);
-          }
-        } else {
-          prefixReference = _getElementReferenceId(enclosing);
-        }
-        index = serializeUnlinkedReference(name, kind,
-            prefixReference: prefixReference, unit: unit);
-        linkedReference = linkedReferences[index];
-      }
-      linkedReference.dependency =
-          librarySerializer.serializeDependency(dependentLibrary);
-      if (element is TypeParameterizedElement) {
-        linkedReference.numTypeParameters += element.typeParameters.length;
-      }
-      return index;
-    });
-  }
-}
-
-/**
- * Instances of this class keep track of intermediate state during
- * serialization of a single constant [Expression].
- */
-class _ConstExprSerializer extends AbstractConstExprSerializer {
-  final _CompilationUnitSerializer serializer;
-  final Element context;
-  final ExecutableElement executableContext;
-
-  /**
-   * If a constructor initializer expression is being serialized, the names of
-   * the constructor parameters.  Otherwise `null`.
-   */
-  final Set<String> constructorParameterNames;
-
-  _ConstExprSerializer(this.serializer, this.context, this.executableContext,
-      this.constructorParameterNames);
-
-  @override
-  bool isParameterName(String name) {
-    return constructorParameterNames?.contains(name) ?? false;
-  }
-
-  @override
-  void serializeAnnotation(Annotation annotation) {
-    if (annotation.arguments == null) {
-      assert(annotation.constructorName == null);
-      serialize(annotation.name);
-    } else {
-      Identifier name = annotation.name;
-      Element nameElement = name.staticElement;
-      EntityRefBuilder constructor;
-      if (nameElement is ConstructorElement && name is PrefixedIdentifier) {
-        assert(annotation.constructorName == null);
-        constructor = serializeConstructorRef(
-            nameElement.returnType, name.prefix, null, name.identifier);
-      } else if (nameElement is TypeDefiningElement) {
-        constructor = serializeConstructorRef(nameElement.type, annotation.name,
-            null, annotation.constructorName);
-      } else if (nameElement == null) {
-        // Unresolved annotation.
-        if (name is PrefixedIdentifier && annotation.constructorName == null) {
-          constructor =
-              serializeConstructorRef(null, name.prefix, null, name.identifier);
-        } else {
-          constructor = serializeConstructorRef(
-              null, annotation.name, null, annotation.constructorName);
-        }
-      } else {
-        throw new StateError('Unexpected annotation nameElement type:'
-            ' ${nameElement.runtimeType}');
-      }
-      serializeInstanceCreation(constructor, annotation.arguments);
-    }
-  }
-
-  @override
-  EntityRefBuilder serializeConstructorRef(DartType type, Identifier typeName,
-      TypeArgumentList typeArguments, SimpleIdentifier name) {
-    EntityRefBuilder typeRef = serializeType(type, typeName, typeArguments);
-    if (name == null) {
-      return typeRef;
-    } else {
-      LinkedReference typeLinkedRef =
-          serializer.linkedReferences[typeRef.reference];
-      int refId = serializer.serializeUnlinkedReference(
-          name.name,
-          name.staticElement != null
-              ? ReferenceKind.constructor
-              : ReferenceKind.unresolved,
-          prefixReference: typeRef.reference,
-          unit: typeLinkedRef.unit);
-      return new EntityRefBuilder(
-          reference: refId, typeArguments: typeRef.typeArguments);
-    }
-  }
-
-  @override
-  List<int> serializeFunctionExpression(FunctionExpression functionExpression) {
-    if (executableContext == null) {
-      return null;
-    }
-    ExecutableElement functionElement = functionExpression.element;
-    // TOOD(paulberry): handle the situation where [functionExpression] is not
-    // an immediate child of [executableContext].
-    assert(functionElement.enclosingElement == executableContext);
-    int popCount = 0;
-    int localIndex = executableContext.functions.indexOf(functionElement);
-    assert(localIndex != -1);
-    return <int>[popCount, localIndex];
-  }
-
-  EntityRefBuilder serializeIdentifier(Identifier identifier,
-      {int prefixReference: 0}) {
-    if (identifier is SimpleIdentifier) {
-      Element element = identifier.staticElement;
-      if (element is TypeParameterElement) {
-        int typeParameterIndex =
-            serializer.findTypeParameterIndex(element.type, context);
-        return new EntityRefBuilder(paramReference: typeParameterIndex);
-      } else if (_isPrelinkResolvableElement(element)) {
-        int ref = serializer._getElementReferenceId(element);
-        return new EntityRefBuilder(reference: ref);
-      } else {
-        int ref = serializer.serializeUnlinkedReference(
-            identifier.name, ReferenceKind.unresolved);
-        return new EntityRefBuilder(reference: ref);
-      }
-    } else if (identifier is PrefixedIdentifier) {
-      Element element = identifier.staticElement;
-      if (_isPrelinkResolvableElement(element)) {
-        int ref = serializer._getElementReferenceId(element);
-        return new EntityRefBuilder(reference: ref);
-      } else {
-        int prefixRef = serializeIdentifier(identifier.prefix).reference;
-        int ref = serializer.serializeUnlinkedReference(
-            identifier.identifier.name, ReferenceKind.unresolved,
-            prefixReference: prefixRef);
-        return new EntityRefBuilder(reference: ref);
-      }
-    } else {
-      throw new StateError(
-          'Unexpected identifier type: ${identifier.runtimeType}');
-    }
-  }
-
-  @override
-  EntityRefBuilder serializeIdentifierSequence(Expression expr) {
-    if (expr is Identifier) {
-      return serializeIdentifier(expr);
-    }
-    if (expr is PropertyAccess) {
-      Element element = expr.propertyName.staticElement;
-      if (_isPrelinkResolvableElement(element)) {
-        int ref = serializer._getElementReferenceId(element);
-        return new EntityRefBuilder(reference: ref);
-      } else {
-        int targetRef = serializeIdentifierSequence(expr.target).reference;
-        int ref = serializer.serializeUnlinkedReference(
-            expr.propertyName.name, ReferenceKind.unresolved,
-            prefixReference: targetRef);
-        return new EntityRefBuilder(reference: ref);
-      }
-    } else {
-      throw new StateError('Unexpected node type: ${expr.runtimeType}');
-    }
-  }
-
-  @override
-  EntityRefBuilder serializeType(
-      DartType type, Identifier name, TypeArgumentList arguments) {
-    if (name != null) {
-      if (type == null || type.isUndefined) {
-        return serializeIdentifier(name);
-      }
-    }
-    DartType typeOrDynamic = type ?? DynamicTypeImpl.instance;
-    return serializer.serializeTypeRef(typeOrDynamic, context);
-  }
-
-  /**
-   * Return `true` if the given [element] can be resolved at prelink step.
-   */
-  static bool _isPrelinkResolvableElement(Element element) {
-    if (element == null) {
-      return false;
-    }
-    if (element == DynamicTypeImpl.instance.element) {
-      return true;
-    }
-    if (element is PrefixElement) {
-      return true;
-    }
-    Element enclosingElement = element.enclosingElement;
-    if (enclosingElement is CompilationUnitElement) {
-      return true;
-    }
-    if (enclosingElement is ClassElement) {
-      return element is ConstructorElement ||
-          element is ClassMemberElement && element.isStatic ||
-          element is PropertyAccessorElement && element.isStatic;
-    }
-    return false;
-  }
-}
-
-/**
- * Instances of this class keep track of intermediate state during
- * serialization of a single library.
- */
-class _LibrarySerializer {
-  /**
-   * The library to be serialized.
-   */
-  final LibraryElement libraryElement;
-
-  /**
-   * The type provider.  This is used to locate the library for `dart:core`.
-   */
-  final TypeProvider typeProvider;
-
-  /**
-   * Indicates whether the element model being serialized was analyzed using
-   * strong mode.
-   */
-  final bool strongMode;
-
-  /**
-   * Map from [LibraryElement] to the index of the entry in the "dependency
-   * table" that refers to it.
-   */
-  final Map<LibraryElement, int> dependencyMap = <LibraryElement, int>{};
-
-  /**
-   * The "dependency table".  This is the list of objects which should be
-   * written to [LinkedLibrary.dependencies].
-   */
-  final List<LinkedDependencyBuilder> dependencies =
-      <LinkedDependencyBuilder>[];
-
-  /**
-   * The linked portion of the "imports table".  This is the list of ints
-   * which should be written to [LinkedLibrary.imports].
-   */
-  final List<int> linkedImports = <int>[];
-
-  /**
-   * The linked portion of the "exports table".  This is the list of ints
-   * which should be written to [LinkedLibrary.exports].
-   */
-  final List<int> linkedExports = <int>[];
-
-  /**
-   * Set of libraries which have been seen so far while visiting the transitive
-   * closure of exports.
-   */
-  final Set<LibraryElement> librariesAddedToTransitiveExportClosure =
-      new Set<LibraryElement>();
-
-  /**
-   * Map from imported element to the prefix which may be used to refer to that
-   * element; elements for which no prefix is needed are absent from this map.
-   */
-  final Map<Element, PrefixElement> prefixMap = <Element, PrefixElement>{};
-
-  /**
-   * List of serializers for the compilation units constituting this library.
-   */
-  final List<_CompilationUnitSerializer> compilationUnitSerializers =
-      <_CompilationUnitSerializer>[];
-
-  _LibrarySerializer(this.libraryElement, this.typeProvider, this.strongMode) {
-    dependencies.add(new LinkedDependencyBuilder());
-    dependencyMap[libraryElement] = 0;
-  }
-
-  /**
-   * Retrieve a list of the Sources for the compilation units in the library.
-   */
-  List<Source> get unitSources => compilationUnitSerializers
-      .map((_CompilationUnitSerializer s) => s.unitSource)
-      .toList();
-
-  /**
-   * Retrieve a list of the URIs for the compilation units in the library.
-   */
-  List<String> get unitUris => compilationUnitSerializers
-      .map((_CompilationUnitSerializer s) => s.unitUri)
-      .toList();
-
-  /**
-   * Retrieve a list of the [UnlinkedUnitBuilder]s for the compilation units in
-   * the library.
-   */
-  List<UnlinkedUnitBuilder> get unlinkedUnits => compilationUnitSerializers
-      .map((_CompilationUnitSerializer s) => s.unlinkedUnit)
-      .toList();
-
-  /**
-   * Add [exportedLibrary] (and the transitive closure of all libraries it
-   * exports) to the dependency table ([LinkedLibrary.dependencies]).
-   */
-  void addTransitiveExportClosure(LibraryElement exportedLibrary) {
-    if (librariesAddedToTransitiveExportClosure.add(exportedLibrary)) {
-      serializeDependency(exportedLibrary);
-      for (LibraryElement transitiveExport
-          in exportedLibrary.exportedLibraries) {
-        addTransitiveExportClosure(transitiveExport);
-      }
-    }
-  }
-
-  /**
-   * Fill in [prefixMap] using information from [libraryElement.imports].
-   */
-  void computePrefixMap() {
-    for (ImportElement import in libraryElement.imports) {
-      if (import.prefix == null) {
-        continue;
-      }
-      import.importedLibrary.exportNamespace.definedNames
-          .forEach((String name, Element e) {
-        if (new NameFilter.forNamespaceCombinators(import.combinators)
-            .accepts(name)) {
-          prefixMap[e] = import.prefix;
-        }
-      });
-    }
-  }
-
-  /**
-   * Return the index of the entry in the dependency table
-   * ([LinkedLibrary.dependencies]) for the given [dependentLibrary].  A new
-   * entry is added to the table if necessary to satisfy the request.
-   */
-  int serializeDependency(LibraryElement dependentLibrary) {
-    return dependencyMap.putIfAbsent(dependentLibrary, () {
-      int index = dependencies.length;
-      List<String> parts = dependentLibrary.parts
-          .map((CompilationUnitElement e) => e.source.uri.toString())
-          .toList();
-      dependencies.add(new LinkedDependencyBuilder(
-          uri: dependentLibrary.source.uri.toString(), parts: parts));
-      return index;
-    });
-  }
-
-  /**
-   * Serialize the whole library element into a [LinkedLibrary].  Should be
-   * called exactly once for each instance of [_LibrarySerializer].
-   *
-   * The unlinked compilation units are stored in [unlinkedUnits], and their
-   * absolute URIs are stored in [unitUris].
-   */
-  LinkedLibraryBuilder serializeLibrary() {
-    computePrefixMap();
-    LinkedLibraryBuilder pb = new LinkedLibraryBuilder();
-    for (ExportElement exportElement in libraryElement.exports) {
-      addTransitiveExportClosure(exportElement.exportedLibrary);
-      linkedExports.add(serializeDependency(exportElement.exportedLibrary));
-    }
-    for (ImportElement importElement in libraryElement.imports) {
-      addTransitiveExportClosure(importElement.importedLibrary);
-      linkedImports.add(serializeDependency(importElement.importedLibrary));
-    }
-    compilationUnitSerializers.add(new _CompilationUnitSerializer(
-        this, libraryElement.definingCompilationUnit, 0));
-    for (int i = 0; i < libraryElement.parts.length; i++) {
-      compilationUnitSerializers.add(
-          new _CompilationUnitSerializer(this, libraryElement.parts[i], i + 1));
-    }
-    for (_CompilationUnitSerializer compilationUnitSerializer
-        in compilationUnitSerializers) {
-      compilationUnitSerializer.addCompilationUnitElements();
-    }
-    pb.units = compilationUnitSerializers
-        .map((_CompilationUnitSerializer s) => s.linkedUnit)
-        .toList();
-    pb.dependencies = dependencies;
-    pb.numPrelinkedDependencies = dependencies.length;
-    for (_CompilationUnitSerializer compilationUnitSerializer
-        in compilationUnitSerializers) {
-      compilationUnitSerializer.createLinkedInfo();
-    }
-    pb.importDependencies = linkedImports;
-    pb.exportDependencies = linkedExports;
-    List<String> exportedNames =
-        libraryElement.exportNamespace.definedNames.keys.toList();
-    exportedNames.sort();
-    List<LinkedExportNameBuilder> exportNames = <LinkedExportNameBuilder>[];
-    for (String name in exportedNames) {
-      if (libraryElement.publicNamespace.definedNames.containsKey(name)) {
-        continue;
-      }
-      Element element = libraryElement.exportNamespace.get(name);
-      LibraryElement dependentLibrary = element.library;
-      CompilationUnitElement unitElement =
-          element.getAncestor((Element e) => e is CompilationUnitElement);
-      int unit = dependentLibrary.units.indexOf(unitElement);
-      assert(unit != -1);
-      ReferenceKind kind = _getReferenceKind(element);
-      exportNames.add(new LinkedExportNameBuilder(
-          name: name,
-          dependency: serializeDependency(dependentLibrary),
-          unit: unit,
-          kind: kind));
-    }
-    pb.exportNames = exportNames;
-    return pb;
-  }
-}