Generate tear-off closures dynamically.

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

Index: dart/sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart b/dart/sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart
index d90caf63373636f2e0ee95f1f3658d0f6354a149..923fd838ee02ebf98d5b2412d842ea0c6c97583b 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_emitter/reflection_data_parser.dart
@@ -4,8 +4,21 @@
 
 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;
+const REQUIRED_PARAMETER_INDEX = 3;
+const OPTIONAL_PARAMETER_INDEX = 4;
+const DEFAULT_ARGUMENTS_INDEX = 5;
+
 // TODO(ahe): This code should be integrated in CodeEmitterTask.finishClasses.
-String getReflectionDataParser(String classesCollector, Namer namer) {
+String getReflectionDataParser(String classesCollector,
+                               JavaScriptBackend backend) {
+  Namer namer = backend.namer;
+  Compiler compiler = backend.compiler;
+  Element closureFromTearOff =
+      compiler.findHelper(const SourceString('closureFromTearOff'));
   String metadataField = '"${namer.metadataField}"';
   String reflectableField = namer.reflectableField;
   String defaultValuesField = namer.defaultValuesField;
@@ -80,6 +93,8 @@ String getReflectionDataParser(String classesCollector, Namer namer) {
           globalObject[previousProperty = property] = element;
           functions.push(property);
           init.globalFunctions[property] = element;
+        } else if (element.constructor === Array) {
+          addStubs(globalObject, element, property, true);
         } else {
           previousProperty = property;
           var newDesc = {};
@@ -103,7 +118,12 @@ String getReflectionDataParser(String classesCollector, Namer namer) {
               }
               optionalMethods[prop] = previousProp;
             } else {
-              newDesc[previousProp = prop] = element[prop];
+              var elem = element[prop];
+              if (elem != null && elem.constructor === Array) {
+                addStubs(newDesc, elem, prop, false);
+              } else {
+                newDesc[previousProp = prop] = elem;
+              }
             }
           }
           $classesCollector[property] = [globalObject, newDesc];
@@ -115,5 +135,28 @@ String getReflectionDataParser(String classesCollector, Namer namer) {
     libraries.push([name, uri, classes, functions, metadata, fields, isRoot,
                     globalObject]);
   }
+  function addStubs(descriptor, array, name, isStatic) {
+    descriptor[name] = array[0];
+    var getterStubName = array[1];
+    if (getterStubName != null) {
+      print("Patching getter stub " + getterStubName + " " + !!isStatic);
+      descriptor[getterStubName] = tearOff(array, isStatic);
+    }
+    var index = $DEFAULT_ARGUMENTS_INDEX + array[$OPTIONAL_PARAMETER_INDEX];
+    while (index < array.length) {
+      var stub = array[index++];
+      if (typeof stub != "function") break;
+      var stubName = array[index++];
+      print("Patching stub " + stubName + " " + !!isStatic);
+      index++''' // Skip "call" stub.
+''';
+      descriptor[stubName] = stub;
+    }
+  }
+  function tearOff(array, isStatic) {
+    return function() {
+      return ${namer.isolateAccess(closureFromTearOff)}(this, array, isStatic);
+    }
+  }
 })''';
 }