Support serialization of the compiler backbone.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, 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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 15 matching lines @@
 import 'filenames.dart' as filenames;
 import 'inferrer/concrete_types_inferrer.dart' as concrete_types_inferrer;
 import 'inferrer/type_graph_inferrer.dart' as type_graph_inferrer;
 import 'io/line_column_provider.dart' as io;
 import 'io/source_map_builder.dart' as io;
 import 'js/js.dart' as js;
 import 'js_backend/js_backend.dart' as js_backend;
 import 'js_emitter/js_emitter.dart' as js_emitter;
 import 'js_emitter/program_builder.dart' as program_builder;
 import 'resolution/semantic_visitor.dart' as semantic_visitor;
+import 'resolution/operators.dart' as operators;
 import 'source_file_provider.dart' as source_file_provider;
 import 'ssa/ssa.dart' as ssa;
 import 'tree/tree.dart' as tree;
 import 'util/util.dart' as util;
 
 import 'scanner/scannerlib.dart' show
     PartialClassElement,
     PartialFunctionElement;
 
 class ElementVisitor extends elements_visitor.BaseElementVisitor {
   visitElement(e, a) {}
 }
 
 void main(List<String> arguments) {
   useApi(null);
   dart2js.main(arguments);
   dart2jslib.isPublicName(null);
-  useConstant(null, null, null, null, null);
+  useConstant();
   useNode(null);
   useUtil(null);
   useSetlet(null);
   useImmutableEmptySet(null);
   useElementVisitor(new ElementVisitor());
   useJsNode(new js.Program(null));
   useJsNode(new js.NamedFunction(null, null));
   useJsNode(new js.ArrayHole());
   useJsOther(new js.SimpleJavaScriptPrintingContext());
   useJsBackend(null);
@@ skipping 10 matching lines @@
   useCodeEmitterTask(null);
   useScript(null);
   useProgramBuilder(null);
   useSemanticVisitor();
   useTreeVisitors();
 }
 
 useApi(api.ReadStringFromUri uri) {
 }
 
-void useConstant(constants.ConstantValue constant,
-                 constants.ConstantExpression expression,
-                 constants.ConstructedConstantExpression constructedConstant,
-                 constants.ConstantSystem cs,
-                 constants.Environment env) {
+class NullConstantConstructorVisitor extends constants.ConstantConstructorVisitor {
+  @override
+  visitGenerative(constants.GenerativeConstantConstructor constructor, arg) {
+  }
+
+  @override
+  visitRedirectingFactory(
+      constants.RedirectingFactoryConstantConstructor constructor, arg) {
+  }
+
+  @override
+  visitRedirectingGenerative(
+      constants.RedirectingGenerativeConstantConstructor constructor, arg) {
+  }
+}
+
+void useConstant([constants.ConstantValue constant,
+                  constants.ConstantExpression expression,
+                  constants.ConstructedConstantExpression constructedConstant,
+                  constants.ConstantSystem cs,
+                  constants.Environment env]) {
   constant.isObject;
   cs.isBool(constant);
   constructedConstant.computeInstanceType();
   constructedConstant.computeInstanceFields();
   expression.evaluate(null, null);
+  new NullConstantConstructorVisitor()
+      ..visit(null, null)
+      ..visitGenerative(null, null)
+      ..visitRedirectingFactory(null, null)
+      ..visitRedirectingGenerative(null, null);
+
 }
 
 void useNode(tree.Node node) {
   node
     ..asAsyncModifier()
     ..asAsyncForIn()
     ..asAwait()
     ..asBreakStatement()
     ..asCascade()
     ..asCatchBlock()
@@ skipping 182 matching lines @@
 useScript(dart2jslib.Script script) {
   script.copyWithFile(null);
 }
 
 useProgramBuilder(program_builder.ProgramBuilder builder) {
   builder.buildMethodHackForIncrementalCompilation(null);
   builder.buildFieldsHackForIncrementalCompilation(null);
 }
 
 useSemanticVisitor() {
+  operators.UnaryOperator.fromKind(null);
+  operators.BinaryOperator.fromKind(null);
   new semantic_visitor.BulkSendVisitor()
       ..apply(null, null)
       ..visitSuperFieldFieldCompound(null, null, null, null, null, null);
   new semantic_visitor.TraversalVisitor(null).apply(null, null);
   new semantic_visitor.BulkDeclarationVisitor().apply(null, null);
 }
 
 class TreeVisitor1 extends tree_ir.ExpressionVisitor1
                       with tree_ir.StatementVisitor1 {
   noSuchMethod(inv) {}
 }
 
 useTreeVisitors() {
   new TreeVisitor1().visitExpression(null, null);
   new TreeVisitor1().visitStatement(null, null);
 }