Emit classes using ASTs

sdk/lib/_internal/compiler/implementation/js_backend/backend.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.
 
 part of js_backend;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 899 matching lines @@
         // the static variable.
         // We also need to register the use of the cyclic-error helper.
         compiler.enqueuer.codegen.registerStaticUse(cyclicThrowHelper);
       }
     }
 
     HGraph graph = builder.build(work);
     optimizer.optimize(work, graph, false);
     if (work.allowSpeculativeOptimization
         && optimizer.trySpeculativeOptimizations(work, graph)) {
-      CodeBuffer codeBuffer = generator.generateBailoutMethod(work, graph);
-      compiler.codegenWorld.addBailoutCode(work, codeBuffer);
+      js.Expression code = generator.generateBailoutMethod(work, graph);
+      compiler.codegenWorld.addBailoutCode(work, code);
       optimizer.prepareForSpeculativeOptimizations(work, graph);
       optimizer.optimize(work, graph, true);
     }
-    CodeBuffer codeBuffer = generator.generateCode(work, graph);
-    compiler.codegenWorld.addGeneratedCode(work, codeBuffer);
+    js.Expression code = generator.generateCode(work, graph);
+    compiler.codegenWorld.addGeneratedCode(work, code);
     invalidateAfterCodegen.forEach(compiler.enqueuer.codegen.eagerRecompile);
     invalidateAfterCodegen.clear();
   }
 
 
   native.NativeEnqueuer nativeResolutionEnqueuer(Enqueuer world) {
     return new native.NativeResolutionEnqueuer(world, compiler);
   }
 
   native.NativeEnqueuer nativeCodegenEnqueuer(Enqueuer world) {
@@ skipping 201 matching lines @@
     print("Inferred return types:");
     print("----------------------");
     dumpReturnTypes();
     print("");
     print("Inferred field types:");
     print("------------------------");
     fieldTypes.dump();
     print("");
   }
 }