Generate parameter stubs using ASTs.

sdk/lib/_internal/compiler/implementation/ssa/codegen.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 ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 55 matching lines @@
   CodeBuffer generateMethod(WorkItem work, HGraph graph) {
     return measure(() {
       compiler.tracer.traceGraph("codegen", graph);
       SsaOptimizedCodeGenerator codegen =
           new SsaOptimizedCodeGenerator(backend, work);
       codegen.visitGraph(graph);
 
       FunctionElement element = work.element;
       js.Block body;
       ClassElement enclosingClass = element.getEnclosingClass();
-      bool allowVariableMinification;
+      bool allowVariableMinification = !codegen.visitedForeignCode;
+
       if (element.isInstanceMember()
           && enclosingClass.isNative()
           && native.isOverriddenMethod(
               element, enclosingClass, nativeEmitter)) {
         // Record that this method is overridden. In case of optional
         // arguments, the emitter will generate stubs to handle them,
         // and needs to know if the method is overridden.
         nativeEmitter.overriddenMethods.add(element);
         StringBuffer buffer = new StringBuffer();
-        String codeString = prettyPrint(codegen.body).toString();
-        String parametersString =
-            Strings.join(codegen.parameterNames.values, ", ");
-        native.generateMethodWithPrototypeCheckForElement(
-            compiler, buffer, element, codeString, parametersString);
-        js.Node nativeCode = new js.LiteralStatement(buffer.toString());
-        body = new js.Block(<js.Statement>[nativeCode]);
-        allowVariableMinification = false;
+        body =
+            nativeEmitter.generateMethodBodyWithPrototypeCheckForElement(
+                element, codegen.body, codegen.parameters);
       } else {
         body = codegen.body;
-        allowVariableMinification = !codegen.visitedForeignCode;
       }
+
       js.Fun fun = buildJavaScriptFunction(element, codegen.parameters, body);
       return prettyPrint(fun,
                          allowVariableMinification: allowVariableMinification);
     });
   }
 
   CodeBuffer generateBailoutMethod(WorkItem work, HGraph graph) {
     return measure(() {
       compiler.tracer.traceGraph("codegen-bailout", graph);
 
@@ skipping 2926 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }