Better runtime type checks.

frog/var_member.dart

 // Copyright (c) 2011, 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.
 
 /** A dynamic member stub. */
 class VarMember {
   final String name;
 
   VarMember(this.name);
 
@@ skipping 119 matching lines @@
       code.writeln('return ${body.code};');
       code.exitBlock('}');
     }
   }
 
   bool _useDirectCall(Member member, Arguments args) {
     // TODO(jmesserly): for now disallow direct references to DOM types until we
     // figure out which types can be patched reliably.
     // I don't think our other native libs have this issue.
     if (member is MethodMember && member.declaringType.library != world.dom) {
+      MethodMember method = member;
+      if (method.needsArgumentConversion(args)) {
+        return false;
+      }
+
       // If we have the right number of parameters, or all defaults would be
       // filled in as "undefined" anyway, we can just call the method directly.
-      MethodMember method = member;
-      method.genParameterValues();
       for (int i = args.length; i < method.parameters.length; i++) {
         if (method.parameters[i].value.code != 'null') {
           return false;
         }
       }
       return method.namesInOrder(args);
     } else {
       return false;
     }
   }
@@ skipping 92 matching lines @@
   }
 }
 
 String _getCallStubName(String name, Arguments args) {
   final nameBuilder = new StringBuffer('${name}\$${args.bareCount}');
   for (int i = args.bareCount; i < args.length; i++) {
     nameBuilder.add('\$').add(args.getName(i));
   }
   return nameBuilder.toString();
 }