Implement reflection on annotations of parameters.

sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart

 // Copyright (c) 2013, 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 dart2js.js_emitter;
 
 // TODO(ahe): Share these with js_helper.dart.
 const FUNCTION_INDEX = 0;
 const NAME_INDEX = 1;
 const CALL_NAME_INDEX = 2;
@@ skipping 80 matching lines @@
     var isAccessor = (requiredParameterInfo & 1) === 1;
     var isSetter = requiredParameterInfo === 3;
     var isGetter = requiredParameterInfo === 1;
     var optionalParameterInfo = ${readInt("array", "1")};
     var optionalParameterCount = optionalParameterInfo >> 1;
     var optionalParametersAreNamed = (optionalParameterInfo & 1) === 1;
     var isIntercepted =''' // Break long line.
        ''' requiredParameterCount + optionalParameterCount != funcs[0].length;
     var functionTypeIndex = ${readFunctionType("array", "2")};
     var isReflectable =''' // Break long line.
-    ''' array.length > requiredParameterCount + optionalParameterCount + 3;
+    ''' array.length > 3 * optionalParameterCount + ''' // Break
+    '''2 * requiredParameterCount + 3
     if (getterStubName) {
       f = tearOff(funcs, array, isStatic, name, isIntercepted);
 '''
       /* Used to create an isolate using spawnFunction.*/
 '''
       if (isStatic) init.globalFunctions[name] = f;
       originalDescriptor[getterStubName] = descriptor[getterStubName] = f;
       funcs.push(f);
       if (getterStubName) functions.push(getterStubName);
       f.\$stubName = getterStubName;
       f.\$callName = null;
     }
     if (isReflectable) {
       for (var i = 0; i < funcs.length; i++) {
         funcs[i].$reflectableField = 1;
         funcs[i].$reflectionInfoField = array;
       }
     }
     if (isReflectable) {
       var unmangledNameIndex =''' // Break long line.
-      ''' optionalParameterCount * 2 + requiredParameterCount + 3;
+      ''' 3 * optionalParameterCount + 2 * requiredParameterCount + 3;
       var unmangledName = ${readString("array", "unmangledNameIndex")};
       var reflectionName =''' // Break long line.
       ''' unmangledName + ":" + requiredParameterCount +''' // Break long line.
       ''' ":" + optionalParameterCount;
       if (isGetter) {
         reflectionName = unmangledName;
       } else if (isSetter) {
         reflectionName = unmangledName + "=";
       }
       if (isStatic) {
@@ skipping 210 matching lines @@
 (function() {
   var result = $array[$index];
   if ($check) {
     throw new Error(
         name + ": expected value of type \'$type\' at index " + ($index) +
         " but got " + (typeof result));
   }
   return result;
 })()''';
 }