Introduce the TYPEDEF element, and use it in order to catch passing closures to the DOM. I make the…

frog/leg/native_handler.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.
 
 #library('native');
 #import('../../lib/uri/uri.dart');
 #import('leg.dart');
 #import('elements/elements.dart');
 #import('scanner/scannerlib.dart');
 #import('ssa/ssa.dart');
@@ skipping 131 matching lines @@
     List<HInstruction> inputs = <HInstruction>[];
     FunctionElement element = builder.work.element;
     FunctionParameters parameters = element.computeParameters(builder.compiler);
     int i = 0;
     String receiver = '';
     if (element.isInstanceMember()) {
       receiver = '\$$i.';
       i++;
       inputs.add(builder.localsHandler.readThis());
     }
+    Compiler compiler = builder.compiler;
     parameters.forEachParameter((Element parameter) {
+      Type type = parameter.computeType(compiler);
+      HInstruction input = builder.localsHandler.readLocal(parameter);
+      if (type is FunctionType) {
+        // TODO(ngeoffray): by better analyzing the function type and
+        // its formal parameters, we could just pass, eg closure.$call$0.
+        builder.push(new HStatic(builder.interceptors.getClosureConverter()));
+        List<HInstruction> callInputs = <HInstruction>[builder.pop(), input];
+        input = new HInvokeStatic(Selector.INVOCATION_1, callInputs);
+        builder.add(input);
+      }
+      inputs.add(input);
       arguments.add('\$$i');
-      inputs.add(builder.localsHandler.readLocal(parameter));
       i++;
     });
     String foreignParameters = Strings.join(arguments, ',');
 
     String dartMethodName;
     String nativeMethodName = element.name.slowToString();
     String nativeMethodCall;
 
     if (element.kind == ElementKind.FUNCTION) {
       dartMethodName = builder.compiler.namer.instanceMethodName(
@@ skipping 80 matching lines @@
   } else if (!node.arguments.tail.isEmpty()) {
     builder.compiler.cancel('More than one argument to native');
   } else {
     LiteralString jsCode = node.arguments.head;
     int start = jsCode.value.slowToString()[0] === '@' ? 1 : 0;
     builder.push(new HForeign(builder.unquote(jsCode, start),
                               const SourceString('Object'),
                               <HInstruction>[]));
   }
 }