Add typedef AST node boilerplate.

pkg/kernel/lib/binary/ast_from_binary.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.ast_from_binary;
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import '../ast.dart';
 import '../transformations/flags.dart';
@@ skipping 295 matching lines @@
   }
 
   Reference readMemberReference({bool allowNull: false}) {
     var name = readCanonicalNameReference();
     if (name == null && !allowNull) {
       throw 'Expected a member reference to be valid but was `null`.';
     }
     return name?.getReference();
   }
 
+  Reference readTypedefReference() {
+    return readCanonicalNameReference().getReference();
+  }
+
   Name readName() {
     String text = readStringReference();
     if (text.isNotEmpty && text[0] == '_') {
       return new Name.byReference(text, readLibraryReference());
     } else {
       return new Name(text);
     }
   }
 
   Library readLibrary(Program program) {
@@ skipping 17 matching lines @@
     if (shouldWriteData) {
       library.isExternal = isExternal;
       library.name = name;
       library.fileUri = fileUri;
     }
 
     _readDeferredImports(library);
 
     debugPath.add(library.name ?? library.importUri?.toString() ?? 'library');
 
+    _mergeNamedNodeList(library.typedefs, readTypedef, library);
     _mergeNamedNodeList(library.classes, readClass, library);
     _mergeNamedNodeList(library.fields, readField, library);
     _mergeNamedNodeList(library.procedures, readProcedure, library);
 
     debugPath.removeLast();
     _currentLibrary = null;
     return library;
   }
 
   void _readDeferredImports(Library library) {
     int length = readUInt();
     if (library.isExternal) {
       assert(length == 0);
       return;
     }
     library.deferredImports.length = length;
     for (int i = 0; i < length; ++i) {
       library.deferredImports[i] = new DeferredImport.byReference(
           readLibraryReference(), readStringReference())
         ..parent = library;
     }
   }
 
+  Typedef readTypedef() {
+    var canonicalName = readCanonicalNameReference();
+    var reference = canonicalName.getReference();
+    Typedef node = reference.node;
+    bool shouldWriteData = node == null || _isReadingLibraryImplementation;
+    if (node == null) {
+      node = new Typedef(null, null, reference: reference);
+    }
+    int fileOffset = readOffset();
+    String name = readStringReference();
+    String fileUri = readUriReference();
+    readAndPushTypeParameterList(node.typeParameters, node);
+    var type = readDartType();
+    typeParameterStack.length = 0;
+    if (shouldWriteData) {
+      node.fileOffset = fileOffset;
+      node.name = name;
+      node.fileUri = fileUri;
+      node.type = type;
+    }
+    return node;
+  }
+
   Class readClass() {
     int tag = readByte();
     assert(tag == Tag.Class);
     var canonicalName = readCanonicalNameReference();
     var reference = canonicalName.getReference();
     Class node = reference.node;
     bool shouldWriteData = node == null || _isReadingLibraryImplementation;
     if (node == null) {
       node = new Class(reference: reference)..level = ClassLevel.Temporary;
     }
@@ skipping 626 matching lines @@
     return new NamedType(readStringReference(), readDartType());
   }
 
   DartType readDartTypeOption() {
     return readAndCheckOptionTag() ? readDartType() : null;
   }
 
   DartType readDartType() {
     int tag = readByte();
     switch (tag) {
+      case Tag.TypedefType:
+        return new TypedefType.byReference(
+            readTypedefReference(), readDartTypeList());
       case Tag.VectorType:
         return const VectorType();
       case Tag.BottomType:
         return const BottomType();
       case Tag.InvalidType:
         return const InvalidType();
       case Tag.DynamicType:
         return const DynamicType();
       case Tag.VoidType:
         return const VoidType();
@@ skipping 95 matching lines @@
       ..fileOffset = offset
       ..fileEqualsOffset = fileEqualsOffset;
   }
 
   int readOffset() {
     // Offset is saved as unsigned,
     // but actually ranges from -1 and up (thus the -1)
     return readUInt() - 1;
   }
 }