Add interceptor support for symbols

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1838 matching lines @@
 
   // base1 and base2 cannot cross reference to each's prototype
   CHECK(v8_compile("obj.v2")->Run()->IsUndefined());
   CHECK(v8_compile("obj2.v1")->Run()->IsUndefined());
 }
 
 
 int echo_named_call_count;
 
 
-static void EchoNamedProperty(Local<String> name,
+static void EchoNamedProperty(Local<Name> name,
                               const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK_EQ(v8_str("data"), info.Data());
   echo_named_call_count++;
   info.GetReturnValue().Set(name);
 }
 
 
 // Helper functions for Interceptor/Accessor interaction tests
 
@@ skipping 21 matching lines @@
 
 void SymbolAccessorSetter(Local<Name> name, Local<Value> value,
                           const v8::PropertyCallbackInfo<void>& info) {
   CHECK(name->IsSymbol());
   Local<Symbol> sym = Local<Symbol>::Cast(name);
   if (sym->Name()->IsUndefined())
     return;
   SimpleAccessorSetter(Local<String>::Cast(sym->Name()), value, info);
 }
 
-void EmptyInterceptorGetter(Local<String> name,
+void EmptyInterceptorGetter(Local<Name> name,
                             const v8::PropertyCallbackInfo<v8::Value>& info) {
 }
 
-void EmptyInterceptorSetter(Local<String> name,
+void EmptyInterceptorSetter(Local<Name> name,
                             Local<Value> value,
                             const v8::PropertyCallbackInfo<v8::Value>& info) {
 }
 
-void InterceptorGetter(Local<String> name,
-                       const v8::PropertyCallbackInfo<v8::Value>& info) {
+void EmptyGenericInterceptorGetter(Local<Name> name,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+}
+
+void EmptyGenericInterceptorSetter(Local<Name> name,
+    Local<Value> value,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+}
+
+void StringInterceptorGetter(Local<String> name,
+                             const v8::PropertyCallbackInfo<v8::Value>& info) {
   // Intercept names that start with 'interceptor_'.
   String::Utf8Value utf8(name);
   char* name_str = *utf8;
   char prefix[] = "interceptor_";
   int i;
   for (i = 0; name_str[i] && prefix[i]; ++i) {
     if (name_str[i] != prefix[i]) return;
   }
   Handle<Object> self = Handle<Object>::Cast(info.This());
   info.GetReturnValue().Set(self->GetHiddenValue(v8_str(name_str + i)));
 }
 
-void InterceptorSetter(Local<String> name,
-                       Local<Value> value,
-                       const v8::PropertyCallbackInfo<v8::Value>& info) {
+void StringInterceptorSetter(Local<String> name,
+                             Local<Value> value,
+                             const v8::PropertyCallbackInfo<v8::Value>& info) {
   // Intercept accesses that set certain integer values, for which the name does
   // not start with 'accessor_'.
   String::Utf8Value utf8(name);
   char* name_str = *utf8;
   char prefix[] = "accessor_";
   int i;
   for (i = 0; name_str[i] && prefix[i]; ++i) {
     if (name_str[i] != prefix[i]) break;
   }
   if (!prefix[i]) return;
 
   if (value->IsInt32() && value->Int32Value() < 10000) {
     Handle<Object> self = Handle<Object>::Cast(info.This());
     self->SetHiddenValue(name, value);
     info.GetReturnValue().Set(value);
   }
 }
 
+void InterceptorGetter(Local<Name> generic_name,
+                       const v8::PropertyCallbackInfo<v8::Value>& info) {
+  if (generic_name->IsSymbol()) return;
+  StringInterceptorGetter(Local<String>::Cast(generic_name), info);
+}
+
+void InterceptorSetter(Local<Name> generic_name,
+                       Local<Value> value,
+                       const v8::PropertyCallbackInfo<v8::Value>& info) {
+  if (generic_name->IsSymbol()) return;
+  StringInterceptorSetter(Local<String>::Cast(generic_name), value, info);
+}
+
+void GenericInterceptorGetter(Local<Name> generic_name,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  Local<String> str;
+  if (generic_name->IsSymbol()) {
+    Local<Value> name = Local<Symbol>::Cast(generic_name)->Name();
+    if (name->IsUndefined()) return;
+    str = String::Concat(v8_str("_sym_"), Local<String>::Cast(name));
+  } else {
+    Local<String> name = Local<String>::Cast(generic_name);
+    String::Utf8Value utf8(name);
+    char* name_str = *utf8;
+    if (*name_str == '_') return;
+    str = String::Concat(v8_str("_str_"), name);
+  }
+
+  Handle<Object> self = Handle<Object>::Cast(info.This());
+  info.GetReturnValue().Set(self->Get(str));
+}
+
+void GenericInterceptorSetter(Local<Name> generic_name,
+    Local<Value> value,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  Local<String> str;
+  if (generic_name->IsSymbol()) {
+    Local<Value> name = Local<Symbol>::Cast(generic_name)->Name();
+    if (name->IsUndefined()) return;
+    str = String::Concat(v8_str("_sym_"), Local<String>::Cast(name));
+  } else {
+    Local<String> name = Local<String>::Cast(generic_name);
+    String::Utf8Value utf8(name);
+    char* name_str = *utf8;
+    if (*name_str == '_') return;
+    str = String::Concat(v8_str("_str_"), name);
+  }
+
+  Handle<Object> self = Handle<Object>::Cast(info.This());
+  self->Set(str, value);
+  info.GetReturnValue().Set(value);
+}
+
 void AddAccessor(Handle<FunctionTemplate> templ,
                  Handle<String> name,
                  v8::AccessorGetterCallback getter,
                  v8::AccessorSetterCallback setter) {
   templ->PrototypeTemplate()->SetAccessor(name, getter, setter);
 }
 
 void AddInterceptor(Handle<FunctionTemplate> templ,
                     v8::NamedPropertyGetterCallback getter,
                     v8::NamedPropertySetterCallback setter) {
   templ->InstanceTemplate()->SetNamedPropertyHandler(getter, setter);
 }
 
 
 void AddAccessor(Handle<FunctionTemplate> templ,
                  Handle<Name> name,
                  v8::AccessorNameGetterCallback getter,
                  v8::AccessorNameSetterCallback setter) {
   templ->PrototypeTemplate()->SetAccessor(name, getter, setter);
 }
 
+void AddInterceptor(Handle<FunctionTemplate> templ,
+                    v8::GenericNamedPropertyGetterCallback getter,
+                    v8::GenericNamedPropertySetterCallback setter) {
+  templ->InstanceTemplate()->SetNamedPropertyHandler(getter, setter);
+}
+
 
 THREADED_TEST(EmptyInterceptorDoesNotShadowAccessors) {
   v8::HandleScope scope(CcTest::isolate());
   Handle<FunctionTemplate> parent = FunctionTemplate::New(CcTest::isolate());
   Handle<FunctionTemplate> child = FunctionTemplate::New(CcTest::isolate());
   child->Inherit(parent);
   AddAccessor(parent, v8_str("age"),
               SimpleAccessorGetter, SimpleAccessorSetter);
   AddInterceptor(child, EmptyInterceptorGetter, EmptyInterceptorSetter);
   LocalContext env;
   env->Global()->Set(v8_str("Child"), child->GetFunction());
   CompileRun("var child = new Child;"
              "child.age = 10;");
   ExpectBoolean("child.hasOwnProperty('age')", false);
   ExpectInt32("child.age", 10);
   ExpectInt32("child.accessor_age", 10);
 }
 
 
+THREADED_TEST(LegacyInterceptorDoesNotSeeSymbols) {
+  LocalContext env;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope scope(isolate);
+  Handle<FunctionTemplate> parent = FunctionTemplate::New(isolate);
+  Handle<FunctionTemplate> child = FunctionTemplate::New(isolate);
+  v8::Local<v8::Symbol> age = v8::Symbol::New(isolate, v8_str("age"));
+
+  child->Inherit(parent);
+  AddAccessor(parent, age, SymbolAccessorGetter, SymbolAccessorSetter);
+  AddInterceptor(child, StringInterceptorGetter, StringInterceptorSetter);
+
+  env->Global()->Set(v8_str("Child"), child->GetFunction());
+  env->Global()->Set(v8_str("age"), age);
+  CompileRun("var child = new Child;"
+             "child[age] = 10;");
+  ExpectInt32("child[age]", 10);
+  ExpectBoolean("child.hasOwnProperty('age')", false);
+  ExpectBoolean("child.hasOwnProperty('accessor_age')", true);
+}
+
+
+THREADED_TEST(GenericInterceptorDoesSeeSymbols) {
+  LocalContext env;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope scope(isolate);
+  Handle<FunctionTemplate> parent = FunctionTemplate::New(isolate);
+  Handle<FunctionTemplate> child = FunctionTemplate::New(isolate);
+  v8::Local<v8::Symbol> age = v8::Symbol::New(isolate, v8_str("age"));
+  v8::Local<v8::Symbol> anon = v8::Symbol::New(isolate);
+
+  child->Inherit(parent);
+  AddAccessor(parent, age, SymbolAccessorGetter, SymbolAccessorSetter);
+  AddInterceptor(child, GenericInterceptorGetter, GenericInterceptorSetter);
+
+  env->Global()->Set(v8_str("Child"), child->GetFunction());
+  env->Global()->Set(v8_str("age"), age);
+  env->Global()->Set(v8_str("anon"), anon);
+  CompileRun("var child = new Child;"
+             "child[age] = 10;");
+  ExpectInt32("child[age]", 10);
+  ExpectInt32("child._sym_age", 10);
+
+  // Check that it also sees strings.
+  CompileRun("child.foo = 47");
+  ExpectInt32("child.foo", 47);
+  ExpectInt32("child._str_foo", 47);
+
+  // Check that the interceptor can punt (in this case, on anonymous symbols).
+  CompileRun("child[anon] = 31337");
+  ExpectInt32("child[anon]", 31337);
+}
+
+
 THREADED_TEST(ExecutableAccessorIsPreservedOnAttributeChange) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
   LocalContext env;
   v8::Local<v8::Value> res = CompileRun("var a = []; a;");
   i::Handle<i::JSObject> a(v8::Utils::OpenHandle(v8::Object::Cast(*res)));
   CHECK(a->map()->instance_descriptors()->IsFixedArray());
   CHECK_GT(i::FixedArray::cast(a->map()->instance_descriptors())->length(), 0);
   CompileRun("Object.defineProperty(a, 'length', { writable: false });");
   CHECK_EQ(i::FixedArray::cast(a->map()->instance_descriptors())->length(), 0);
@@ skipping 285 matching lines @@
 
 static void CheckThisIndexedPropertyHandler(
     uint32_t index,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertyHandler));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 static void CheckThisNamedPropertyHandler(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertyHandler));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 void CheckThisIndexedPropertySetter(
     uint32_t index,
     Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertySetter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 
 void CheckThisNamedPropertySetter(
-    Local<String> property,
+    Local<Name> property,
     Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertySetter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 void CheckThisIndexedPropertyQuery(
     uint32_t index,
     const v8::PropertyCallbackInfo<v8::Integer>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertyQuery));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 
 void CheckThisNamedPropertyQuery(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Integer>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertyQuery));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 
 void CheckThisIndexedPropertyDeleter(
     uint32_t index,
     const v8::PropertyCallbackInfo<v8::Boolean>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertyDeleter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 
 void CheckThisNamedPropertyDeleter(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Boolean>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisNamedPropertyDeleter));
   ApiTestFuzzer::Fuzz();
   CHECK(info.This()->Equals(bottom));
 }
 
 
 void CheckThisIndexedPropertyEnumerator(
     const v8::PropertyCallbackInfo<v8::Array>& info) {
   CheckReturnValue(info, FUNCTION_ADDR(CheckThisIndexedPropertyEnumerator));
@@ skipping 54 matching lines @@
   // Indexed and named deleter.
   CompileRun("delete obj[0]");
   CompileRun("delete obj.x");
 
   // Enumerators.
   CompileRun("for (var p in obj) ;");
 }
 
 
 static void PrePropertyHandlerGet(
-    Local<String> key,
+    Local<Name> key,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("pre")->Equals(key)) {
     info.GetReturnValue().Set(v8_str("PrePropertyHandler: pre"));
   }
 }
 
 
 static void PrePropertyHandlerQuery(
-    Local<String> key,
+    Local<Name> key,
     const v8::PropertyCallbackInfo<v8::Integer>& info) {
   if (v8_str("pre")->Equals(key)) {
     info.GetReturnValue().Set(static_cast<int32_t>(v8::None));
   }
 }
 
 
 THREADED_TEST(PrePropertyHandler) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
@@ skipping 66 matching lines @@
   call_recursively_script = v8_compile("callScriptRecursively()");
   call_recursively_script->Run();
   call_recursively_script = v8::Handle<Script>();
 
   env->Global()->Set(v8_str("depth"), v8::Integer::New(isolate, 0));
   CompileRun("callFunctionRecursively()");
 }
 
 
 static void ThrowingPropertyHandlerGet(
-    Local<String> key,
+    Local<Name> key,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
+  // Since this interceptor is used on "with" objects, the runtime will look up
+  // @@unscopables.  Punt.
+  if (key->IsSymbol()) return;
   ApiTestFuzzer::Fuzz();
   info.GetReturnValue().Set(info.GetIsolate()->ThrowException(key));
 }
 
 
 static void ThrowingPropertyHandlerSet(
-    Local<String> key,
+    Local<Name> key,
     Local<Value>,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetIsolate()->ThrowException(key);
   info.GetReturnValue().SetUndefined();  // not the same as empty handle
 }
 
 
 THREADED_TEST(CallbackExceptionRegression) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
@@ skipping 785 matching lines @@
   // If it did we would have full access to the hidden properties in
   // the accessor.
   CHECK(obj->SetHiddenValue(key, v8::Integer::New(env->GetIsolate(), 42)));
   ExpectFalse("set_called");
   CHECK_EQ(42, obj->GetHiddenValue(key)->Int32Value());
 }
 
 
 static bool interceptor_for_hidden_properties_called;
 static void InterceptorForHiddenProperties(
-    Local<String> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
+    Local<Name> name, const v8::PropertyCallbackInfo<v8::Value>& info) {
   interceptor_for_hidden_properties_called = true;
 }
 
 
 THREADED_TEST(HiddenPropertiesWithInterceptors) {
   LocalContext context;
   v8::Isolate* isolate = context->GetIsolate();
   v8::HandleScope scope(isolate);
 
   interceptor_for_hidden_properties_called = false;
@@ skipping 2548 matching lines @@
                      v8_str("donut"));
   LocalContext context;
   context->Global()->Set(v8_str("obj"), templ->NewInstance());
   Local<Script> script = v8_compile("obj.x = 4; obj.x");
   for (int i = 0; i < 10; i++) {
     script->Run();
   }
 }
 
 
-static void XPropertyGetter(Local<String> property,
+static void XPropertyGetter(Local<Name> property,
                             const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK(info.Data()->IsUndefined());
   info.GetReturnValue().Set(property);
 }
 
 
 THREADED_TEST(NamedInterceptorPropertyRead) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
@@ skipping 75 matching lines @@
 
   // Return to the original context and force some object to the slow case
   // to cause the NormalizedMapCache to verify.
   context1->Enter();
   CompileRun("var obj = { x : 0 }; delete obj.x;");
   context1->Exit();
 }
 
 
 static void SetXOnPrototypeGetter(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   // Set x on the prototype object and do not handle the get request.
   v8::Handle<v8::Value> proto = info.Holder()->GetPrototype();
   proto.As<v8::Object>()->Set(v8_str("x"),
                               v8::Integer::New(info.GetIsolate(), 23));
 }
 
 
 // This is a regression test for http://crbug.com/20104. Map
 // transitions should not interfere with post interceptor lookup.
@@ skipping 1436 matching lines @@
   v8::HandleScope scope(isolate);
   v8::Handle<v8::ObjectTemplate> global = ObjectTemplate::New(isolate);
   global->Set(v8_str("f"),
               v8::FunctionTemplate::New(isolate, ArgumentsTestCallback));
   LocalContext context(NULL, global);
   args_fun = context->Global()->Get(v8_str("f")).As<Function>();
   v8_compile("f(1, 2, 3)")->Run();
 }
 
 
-static void NoBlockGetterX(Local<String> name,
+static void NoBlockGetterX(Local<Name> name,
                            const v8::PropertyCallbackInfo<v8::Value>&) {
 }
 
 
 static void NoBlockGetterI(uint32_t index,
                            const v8::PropertyCallbackInfo<v8::Value>&) {
 }
 
 
-static void PDeleter(Local<String> name,
+static void PDeleter(Local<Name> name,
                      const v8::PropertyCallbackInfo<v8::Boolean>& info) {
   if (!name->Equals(v8_str("foo"))) {
     return;  // not intercepted
   }
 
   info.GetReturnValue().Set(false);  // intercepted, don't delete the property
 }
 
 
 static void IDeleter(uint32_t index,
@@ skipping 26 matching lines @@
   CHECK(v8_compile("k.bar")->Run()->IsUndefined());
 
   CHECK(v8_compile("delete k[2]")->Run()->IsFalse());
   CHECK(v8_compile("delete k[4]")->Run()->IsTrue());
 
   CHECK_EQ(v8_compile("k[2]")->Run(), v8_num(2));
   CHECK(v8_compile("k[4]")->Run()->IsUndefined());
 }
 
 
-static void GetK(Local<String> name,
+static void GetK(Local<Name> name,
                  const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (name->Equals(v8_str("foo")) ||
       name->Equals(v8_str("bar")) ||
       name->Equals(v8_str("baz"))) {
     info.GetReturnValue().SetUndefined();
   }
 }
 
 
@@ skipping 113 matching lines @@
     "var o2 = { __proto__: o1 };"
     "var o3 = { __proto__: o2 };"
     "var o4 = { __proto__: o3 };"
     "for (var i = 0; i < 10; i++) o4.p4;"
     "for (var i = 0; i < 10; i++) o3.p3;"
     "for (var i = 0; i < 10; i++) o2.p2;"
     "for (var i = 0; i < 10; i++) o1.p1;");
 }
 
 
-static void PGetter2(Local<String> name,
+static void PGetter2(Local<Name> name,
                      const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   p_getter_count2++;
   v8::Handle<v8::Object> global =
       info.GetIsolate()->GetCurrentContext()->Global();
   CHECK_EQ(info.Holder(), global->Get(v8_str("o1")));
   if (name->Equals(v8_str("p1"))) {
     CHECK_EQ(info.This(), global->Get(v8_str("o1")));
   } else if (name->Equals(v8_str("p2"))) {
     CHECK_EQ(info.This(), global->Get(v8_str("o2")));
@@ skipping 1885 matching lines @@
 THREADED_TEST(GetOwnPropertyNamesWithInterceptor) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Handle<v8::ObjectTemplate> obj_template =
       v8::ObjectTemplate::New(isolate);
 
   obj_template->Set(v8_str("7"), v8::Integer::New(CcTest::isolate(), 7));
   obj_template->Set(v8_str("x"), v8::Integer::New(CcTest::isolate(), 42));
   obj_template->SetIndexedPropertyHandler(NULL, NULL, NULL, NULL,
                                           IndexedPropertyEnumerator);
-  obj_template->SetNamedPropertyHandler(NULL, NULL, NULL, NULL,
+  // TODO(wingo): Types needed to disambiguate between deprecated and new
+  // SetNamedPropertyHandler implementations.  Go back to just passing NULL
+  // values once deprecated API is removed.
+  v8::GenericNamedPropertyGetterCallback getter = NULL;
+  obj_template->SetNamedPropertyHandler(getter, NULL, NULL, NULL,
                                         NamedPropertyEnumerator);
 
   LocalContext context;
   v8::Handle<v8::Object> global = context->Global();
   global->Set(v8_str("object"), obj_template->NewInstance());
 
   v8::Handle<v8::Value> result =
       CompileRun("Object.getOwnPropertyNames(object)");
   CHECK(result->IsArray());
   v8::Handle<v8::Array> result_array = v8::Handle<v8::Array>::Cast(result);
@@ skipping 270 matching lines @@
 
   value = v8_compile("var p = 'as' + 'df';")->Run();
   value = v8_compile("obj[p];")->Run();
 
   context1->Exit();
   context0->Exit();
 }
 
 
 static void AccessControlNamedGetter(
-    Local<String>,
+    Local<Name>,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetReturnValue().Set(42);
 }
 
 
 static void AccessControlNamedSetter(
-    Local<String>,
+    Local<Name>,
     Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetReturnValue().Set(value);
 }
 
 
 static void AccessControlIndexedGetter(
       uint32_t index,
       const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetReturnValue().Set(v8_num(42));
@@ skipping 104 matching lines @@
   context->Global()->Set(v8_str("i"), o);
   Local<Value> value = CompileRun("i.x");
   CHECK_EQ(42, value->Int32Value());
 
   value = CompileRun("i.f()");
   CHECK_EQ(12, value->Int32Value());
 }
 
 
 static void GlobalObjectInstancePropertiesGet(
-    Local<String> key,
+    Local<Name> key,
     const v8::PropertyCallbackInfo<v8::Value>&) {
   ApiTestFuzzer::Fuzz();
 }
 
 
 THREADED_TEST(GlobalObjectInstanceProperties) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
 
   Local<Value> global_object;
@@ skipping 117 matching lines @@
   shadow_y_getter_call_count++;
   info.GetReturnValue().Set(v8_num(shadow_y));
 }
 
 
 static void ShadowIndexedGet(uint32_t index,
                              const v8::PropertyCallbackInfo<v8::Value>&) {
 }
 
 
-static void ShadowNamedGet(Local<String> key,
+static void ShadowNamedGet(Local<Name> key,
                            const v8::PropertyCallbackInfo<v8::Value>&) {
 }
 
 
 THREADED_TEST(ShadowObject) {
   shadow_y = shadow_y_setter_call_count = shadow_y_getter_call_count = 0;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
 
   Local<ObjectTemplate> global_template = v8::ObjectTemplate::New(isolate);
@@ skipping 1102 matching lines @@
       }
     }
     CHECK_EQ(kIterations, v8::HandleScope::NumberOfHandles(isolate));
   }
   CHECK_EQ(0, v8::HandleScope::NumberOfHandles(isolate));
   CHECK_EQ(kNesting * kIterations, Recurse(isolate, kNesting, kIterations));
 }
 
 
 static void InterceptorHasOwnPropertyGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
 }
 
 
 THREADED_TEST(InterceptorHasOwnProperty) {
   LocalContext context;
   v8::Isolate* isolate = context->GetIsolate();
   v8::HandleScope scope(isolate);
   Local<v8::FunctionTemplate> fun_templ = v8::FunctionTemplate::New(isolate);
@@ skipping 10 matching lines @@
       "o.hasOwnProperty('ostehaps');");
   CHECK_EQ(true, value->BooleanValue());
   value = CompileRun(
       "var p = new constructor();"
       "p.hasOwnProperty('ostehaps');");
   CHECK_EQ(false, value->BooleanValue());
 }
 
 
 static void InterceptorHasOwnPropertyGetterGC(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
 }
 
 
 THREADED_TEST(InterceptorHasOwnPropertyCausingGC) {
   LocalContext context;
   v8::Isolate* isolate = context->GetIsolate();
   v8::HandleScope scope(isolate);
@@ skipping 16 matching lines @@
       "x = makestr(31415);"
       "x = makestr(23456);");
   v8::Handle<Value> value = CompileRun(
       "var o = new constructor();"
       "o.__proto__ = new String(x);"
       "o.hasOwnProperty('ostehaps');");
   CHECK_EQ(false, value->BooleanValue());
 }
 
 
-typedef void (*NamedPropertyGetter)(
-    Local<String> property,
-    const v8::PropertyCallbackInfo<v8::Value>& info);
-
-
-static void CheckInterceptorLoadIC(NamedPropertyGetter getter,
-                                   const char* source,
-                                   int expected) {
+static void CheckInterceptorLoadIC(
+    v8::GenericNamedPropertyGetterCallback getter, const char* source,
+    int expected) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
   v8::Handle<v8::ObjectTemplate> templ = ObjectTemplate::New(isolate);
   templ->SetNamedPropertyHandler(getter, 0, 0, 0, 0, v8_str("data"));
   LocalContext context;
   context->Global()->Set(v8_str("o"), templ->NewInstance());
   v8::Handle<Value> value = CompileRun(source);
   CHECK_EQ(expected, value->Int32Value());
 }
 
 
 static void InterceptorLoadICGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   v8::Isolate* isolate = CcTest::isolate();
   CHECK_EQ(isolate, info.GetIsolate());
   CHECK_EQ(v8_str("data"), info.Data());
   CHECK_EQ(v8_str("x"), name);
   info.GetReturnValue().Set(v8::Integer::New(isolate, 42));
 }
 
 
 // This test should hit the load IC for the interceptor case.
 THREADED_TEST(InterceptorLoadIC) {
   CheckInterceptorLoadIC(InterceptorLoadICGetter,
     "var result = 0;"
     "for (var i = 0; i < 1000; i++) {"
     "  result = o.x;"
     "}",
     42);
 }
 
 
 // Below go several tests which verify that JITing for various
 // configurations of interceptor and explicit fields works fine
 // (those cases are special cased to get better performance).
 
 static void InterceptorLoadXICGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   info.GetReturnValue().Set(
       v8_str("x")->Equals(name) ?
           v8::Handle<v8::Value>(v8::Integer::New(info.GetIsolate(), 42)) :
           v8::Handle<v8::Value>());
 }
 
 
 THREADED_TEST(InterceptorLoadICWithFieldOnHolder) {
@@ skipping 95 matching lines @@
     "for (var i = 0; i < 1000; i++) {"
     "  result += o.y;"
     "}"
     "result;",
     42 * 1000);
 }
 
 
 static int interceptor_load_not_handled_calls = 0;
 static void InterceptorLoadNotHandled(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ++interceptor_load_not_handled_calls;
 }
 
 
 // Test how post-interceptor lookups are done in the non-cacheable
 // case: the interceptor should not be invoked during this lookup.
 THREADED_TEST(InterceptorLoadICPostInterceptor) {
   interceptor_load_not_handled_calls = 0;
   CheckInterceptorLoadIC(InterceptorLoadNotHandled,
@@ skipping 222 matching lines @@
     "var result = 0;"
     "for (var i = 0; i < 10; i++) {"
     "  result += o.y;"
     "}"
     "result");
   CHECK_EQ(42 * 10, value->Int32Value());
 }
 
 
 static void InterceptorLoadICGetter0(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK(v8_str("x")->Equals(name));
   info.GetReturnValue().Set(v8::Integer::New(info.GetIsolate(), 0));
 }
 
 
 THREADED_TEST(InterceptorReturningZero) {
   CheckInterceptorLoadIC(InterceptorLoadICGetter0,
      "o.x == undefined ? 1 : 0",
      0);
 }
 
 
 static void InterceptorStoreICSetter(
-    Local<String> key,
+    Local<Name> key,
     Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   CHECK(v8_str("x")->Equals(key));
   CHECK_EQ(42, value->Int32Value());
   info.GetReturnValue().Set(value);
 }
 
 
 // This test should hit the store IC for the interceptor case.
 THREADED_TEST(InterceptorStoreIC) {
@@ skipping 28 matching lines @@
 }
 
 
 
 
 v8::Handle<Value> call_ic_function;
 v8::Handle<Value> call_ic_function2;
 v8::Handle<Value> call_ic_function3;
 
 static void InterceptorCallICGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK(v8_str("x")->Equals(name));
   info.GetReturnValue().Set(call_ic_function);
 }
 
 
 // This test should hit the call IC for the interceptor case.
 THREADED_TEST(InterceptorCallIC) {
   v8::Isolate* isolate = CcTest::isolate();
@@ skipping 27 matching lines @@
     "var result = 0;"
     "for (var i = 0; i < 7; i++) {"
     "  result = o.x(41);"
     "}");
   CHECK_EQ(42, value->Int32Value());
 }
 
 
 static v8::Handle<Value> call_ic_function4;
 static void InterceptorCallICGetter4(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CHECK(v8_str("x")->Equals(name));
   info.GetReturnValue().Set(call_ic_function4);
 }
 
 
 // This test checks that if interceptor provides a function,
 // even if we cached shadowed variant, interceptor's function
 // is invoked
@@ skipping 60 matching lines @@
     "var result = 0;"
     "for (var i = 0; i < 1000; i++) {"
     "  result = o.x(42);"
     "}");
   CHECK_EQ(43, value->Int32Value());
 }
 
 
 static v8::Handle<Value> call_ic_function5;
 static void InterceptorCallICGetter5(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("x")->Equals(name))
     info.GetReturnValue().Set(call_ic_function5);
 }
 
 
 // This test checks that if interceptor provides a function,
 // even if we cached constant function, interceptor's function
 // is invoked
@@ skipping 13 matching lines @@
     "var result = 0;"
     "for (var i = 0; i < 1000; i++) {"
     "  result = o.x(42);"
     "}");
   CHECK_EQ(41, value->Int32Value());
 }
 
 
 static v8::Handle<Value> call_ic_function6;
 static void InterceptorCallICGetter6(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("x")->Equals(name))
     info.GetReturnValue().Set(call_ic_function6);
 }
 
 
 // Same test as above, except the code is wrapped in a function
 // to test the optimized compiler.
 THREADED_TEST(InterceptorCallICConstantFunctionNotNeededWrapped) {
@@ skipping 107 matching lines @@
     "    result += o.parseFloat('239');"
     "  }"
     "  result"
     "} catch(e) {"
     "  e"
     "};");
   CHECK_EQ(239 * 10, value->Int32Value());
 }
 
 static void InterceptorCallICFastApi(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   CheckReturnValue(info, FUNCTION_ADDR(InterceptorCallICFastApi));
   int* call_count =
       reinterpret_cast<int*>(v8::External::Cast(*info.Data())->Value());
   ++(*call_count);
   if ((*call_count) % 20 == 0) {
     CcTest::heap()->CollectAllGarbage(i::Heap::kNoGCFlags);
   }
 }
@@ skipping 555 matching lines @@
   CHECK(try_catch.HasCaught());
   CHECK_EQ(v8_str("TypeError: Illegal invocation"),
            try_catch.Exception()->ToString());
   CHECK_EQ(42, context->Global()->Get(v8_str("saved_result"))->Int32Value());
 }
 
 
 v8::Handle<Value> keyed_call_ic_function;
 
 static void InterceptorKeyedCallICGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("x")->Equals(name)) {
     info.GetReturnValue().Set(keyed_call_ic_function);
   }
 }
 
 
 // Test the case when we stored cacheable lookup into
 // a stub, but the function name changed (to another cacheable function).
@@ skipping 143 matching lines @@
     "  if (i == 5) { proto.method = function(x) { return x - 1; }; };"
     "  result += o[m](41);"
     "}");
   CHECK_EQ(42*5 + 40*5, context->Global()->Get(v8_str("result"))->Int32Value());
 }
 
 
 static int interceptor_call_count = 0;
 
 static void InterceptorICRefErrorGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("x")->Equals(name) && interceptor_call_count++ < 20) {
     info.GetReturnValue().Set(call_ic_function2);
   }
 }
 
 
 // This test should hit load and call ICs for the interceptor case.
 // Once in a while, the interceptor will reply that a property was not
@@ skipping 23 matching lines @@
     "  return false;"
     "};"
     "g();");
   CHECK_EQ(true, value->BooleanValue());
 }
 
 
 static int interceptor_ic_exception_get_count = 0;
 
 static void InterceptorICExceptionGetter(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (v8_str("x")->Equals(name) && ++interceptor_ic_exception_get_count < 20) {
     info.GetReturnValue().Set(call_ic_function3);
   }
   if (interceptor_ic_exception_get_count == 20) {
     info.GetIsolate()->ThrowException(v8_num(42));
     return;
   }
 }
@@ skipping 27 matching lines @@
     "  return false;"
     "};"
     "f();");
   CHECK_EQ(true, value->BooleanValue());
 }
 
 
 static int interceptor_ic_exception_set_count = 0;
 
 static void InterceptorICExceptionSetter(
-      Local<String> key,
+      Local<Name> key,
       Local<Value> value,
       const v8::PropertyCallbackInfo<v8::Value>& info) {
   ApiTestFuzzer::Fuzz();
   if (++interceptor_ic_exception_set_count > 20) {
     info.GetIsolate()->ThrowException(v8_num(42));
   }
 }
 
 
 // Test interceptor store IC where the interceptor throws an exception
@@ skipping 16 matching lines @@
   CHECK_EQ(true, value->BooleanValue());
 }
 
 
 // Test that we ignore null interceptors.
 THREADED_TEST(NullNamedInterceptor) {
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
   v8::Handle<v8::ObjectTemplate> templ = ObjectTemplate::New(isolate);
   templ->SetNamedPropertyHandler(
-      static_cast<v8::NamedPropertyGetterCallback>(0));
+      static_cast<v8::GenericNamedPropertyGetterCallback>(0));
   LocalContext context;
   templ->Set(CcTest::isolate(), "x", v8_num(42));
   v8::Handle<v8::Object> obj = templ->NewInstance();
   context->Global()->Set(v8_str("obj"), obj);
   v8::Handle<Value> value = CompileRun("obj.x");
   CHECK(value->IsInt32());
   CHECK_EQ(42, value->Int32Value());
 }
 
 
@@ skipping 2364 matching lines @@
   }
   info.GetReturnValue().Set(3);
 }
 
 static void ForceSetSetter(v8::Local<v8::String> name,
                            v8::Local<v8::Value> value,
                            const v8::PropertyCallbackInfo<void>& info) {
   force_set_set_count++;
 }
 
+static void ForceSetInterceptGetter(
+    v8::Local<v8::Name> name,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  CHECK(name->IsString());
+  ForceSetGetter(Local<String>::Cast(name), info);
+}
+
 static void ForceSetInterceptSetter(
-    v8::Local<v8::String> name,
+    v8::Local<v8::Name> name,
     v8::Local<v8::Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   force_set_set_count++;
   info.GetReturnValue().SetUndefined();
 }
 
 
 TEST(ForceSet) {
   force_set_get_count = 0;
   force_set_set_count = 0;
@@ skipping 40 matching lines @@
 
 
 TEST(ForceSetWithInterceptor) {
   force_set_get_count = 0;
   force_set_set_count = 0;
   pass_on_get = false;
 
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope scope(isolate);
   v8::Handle<v8::ObjectTemplate> templ = v8::ObjectTemplate::New(isolate);
-  templ->SetNamedPropertyHandler(ForceSetGetter, ForceSetInterceptSetter);
+  templ->SetNamedPropertyHandler(ForceSetInterceptGetter,
+                                 ForceSetInterceptSetter);
   LocalContext context(NULL, templ);
   v8::Handle<v8::Object> global = context->Global();
 
   v8::Handle<v8::String> some_property =
       v8::String::NewFromUtf8(isolate, "a");
   CHECK_EQ(0, force_set_set_count);
   CHECK_EQ(0, force_set_get_count);
   CHECK_EQ(3, global->Get(some_property)->Int32Value());
   // Setting the property shouldn't override it, just call the setter
   // which in this case does nothing.
@@ skipping 47 matching lines @@
   CHECK(global->ForceDelete(simple_property));
   CHECK(global->Get(simple_property)->IsUndefined());
 }
 
 
 static int force_delete_interceptor_count = 0;
 static bool pass_on_delete = false;
 
 
 static void ForceDeleteDeleter(
-    v8::Local<v8::String> name,
+    v8::Local<v8::Name> name,
     const v8::PropertyCallbackInfo<v8::Boolean>& info) {
   force_delete_interceptor_count++;
   if (pass_on_delete) return;
   info.GetReturnValue().Set(true);
 }
 
 
 THREADED_TEST(ForceDeleteWithInterceptor) {
   force_delete_interceptor_count = 0;
   pass_on_delete = false;
@@ skipping 3072 matching lines @@
 static void SetterWhichSetsYOnThisTo23(
     Local<String> name,
     Local<Value> value,
     const v8::PropertyCallbackInfo<void>& info) {
   CHECK(v8::Utils::OpenHandle(*info.This())->IsJSObject());
   CHECK(v8::Utils::OpenHandle(*info.Holder())->IsJSObject());
   Local<Object>::Cast(info.This())->Set(v8_str("y"), v8_num(23));
 }
 
 
-void FooGetInterceptor(Local<String> name,
+void FooGetInterceptor(Local<Name> name,
                        const v8::PropertyCallbackInfo<v8::Value>& info) {
   CHECK(v8::Utils::OpenHandle(*info.This())->IsJSObject());
   CHECK(v8::Utils::OpenHandle(*info.Holder())->IsJSObject());
   if (!name->Equals(v8_str("foo"))) return;
   info.GetReturnValue().Set(v8_num(42));
 }
 
 
-void FooSetInterceptor(Local<String> name,
+void FooSetInterceptor(Local<Name> name,
                        Local<Value> value,
                        const v8::PropertyCallbackInfo<v8::Value>& info) {
   CHECK(v8::Utils::OpenHandle(*info.This())->IsJSObject());
   CHECK(v8::Utils::OpenHandle(*info.Holder())->IsJSObject());
   if (!name->Equals(v8_str("foo"))) return;
   Local<Object>::Cast(info.This())->Set(v8_str("y"), v8_num(23));
   info.GetReturnValue().Set(v8_num(23));
 }
 
 
@@ skipping 26 matching lines @@
 script = v8_compile("new C2();");
   for (int i = 0; i < 10; i++) {
     v8::Handle<v8::Object> c2 = v8::Handle<v8::Object>::Cast(script->Run());
     CHECK_EQ(42, c2->Get(v8_str("x"))->Int32Value());
     CHECK_EQ(23, c2->Get(v8_str("y"))->Int32Value());
   }
 }
 
 
 static void NamedPropertyGetterWhichReturns42(
-    Local<String> name,
+    Local<Name> name,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetReturnValue().Set(v8_num(42));
 }
 
 
 static void NamedPropertySetterWhichSetsYOnThisTo23(
-    Local<String> name,
+    Local<Name> name,
     Local<Value> value,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   if (name->Equals(v8_str("x"))) {
     Local<Object>::Cast(info.This())->Set(v8_str("y"), v8_num(23));
   }
 }
 
 
 THREADED_TEST(InterceptorOnConstructorPrototype) {
   v8::Isolate* isolate = CcTest::isolate();
@@ skipping 1287 matching lines @@
   CHECK(!globalProxy->StrictEquals(global));
   CHECK(globalProxy->StrictEquals(globalProxy));
 
   CHECK(global->Equals(global));
   CHECK(!global->Equals(globalProxy));
   CHECK(!globalProxy->Equals(global));
   CHECK(globalProxy->Equals(globalProxy));
 }
 
 
-static void Getter(v8::Local<v8::String> property,
+static void Getter(v8::Local<v8::Name> property,
                    const v8::PropertyCallbackInfo<v8::Value>& info ) {
   info.GetReturnValue().Set(v8_str("42!"));
 }
 
 
 static void Enumerator(const v8::PropertyCallbackInfo<v8::Array>& info) {
   v8::Handle<v8::Array> result = v8::Array::New(info.GetIsolate());
   result->Set(0, v8_str("universalAnswer"));
   info.GetReturnValue().Set(result);
 }
@@ skipping 144 matching lines @@
 
 
 void HasOwnPropertyIndexedPropertyGetter(
     uint32_t index,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   if (index == 42) info.GetReturnValue().Set(v8_str("yes"));
 }
 
 
 void HasOwnPropertyNamedPropertyGetter(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   if (property->Equals(v8_str("foo"))) info.GetReturnValue().Set(v8_str("yes"));
 }
 
 
 void HasOwnPropertyIndexedPropertyQuery(
     uint32_t index, const v8::PropertyCallbackInfo<v8::Integer>& info) {
   if (index == 42) info.GetReturnValue().Set(1);
 }
 
 
 void HasOwnPropertyNamedPropertyQuery(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Integer>& info) {
   if (property->Equals(v8_str("foo"))) info.GetReturnValue().Set(1);
 }
 
 
 void HasOwnPropertyNamedPropertyQuery2(
-    Local<String> property,
+    Local<Name> property,
     const v8::PropertyCallbackInfo<v8::Integer>& info) {
   if (property->Equals(v8_str("bar"))) info.GetReturnValue().Set(1);
 }
 
 
 void HasOwnPropertyAccessorGetter(
     Local<String> property,
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   info.GetReturnValue().Set(v8_str("yes"));
 }
@@ skipping 1959 matching lines @@
     v8::Local<v8::ObjectTemplate> instance_template = t->InstanceTemplate();
     instance_template->SetNamedPropertyHandler(EmptyInterceptor);
 
     env_->Global()->Set(v8_str("Klass"), t->GetFunction());
 
     CompileRun("var obj = new Klass; while (obj.shouldContinue()) { }");
   }
 
  private:
   static void EmptyInterceptor(
-      Local<String> property,
+      Local<Name> property,
       const v8::PropertyCallbackInfo<v8::Value>& info) {
   }
 };
 
 
 class RequestInterruptTestWithMathAbs
     : public RequestInterruptTestBaseWithSimpleInterrupt {
  public:
   virtual void TestBody() {
     env_->Global()->Set(v8_str("WakeUpInterruptor"), Function::New(
@@ skipping 823 matching lines @@
   desc = x->GetOwnPropertyDescriptor(v8_str("p1"));
   Local<Function> set =
     Local<Function>::Cast(Local<Object>::Cast(desc)->Get(v8_str("set")));
   Local<Function> get =
     Local<Function>::Cast(Local<Object>::Cast(desc)->Get(v8_str("get")));
   CHECK_EQ(v8_num(13), get->Call(x, 0, NULL));
   Handle<Value> args[] = { v8_num(14) };
   set->Call(x, 1, args);
   CHECK_EQ(v8_num(14), get->Call(x, 0, NULL));
 }