add interceptors which do not mask existing properties

src/ic/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 2896 matching lines @@
  */
 RUNTIME_FUNCTION(LoadPropertyWithInterceptorOnly) {
   DCHECK(args.length() == NamedLoadHandlerCompiler::kInterceptorArgsLength);
   Handle<Name> name =
       args.at<Name>(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex);
   Handle<JSObject> receiver =
       args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex);
   Handle<JSObject> holder =
       args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex);
   HandleScope scope(isolate);
-  Handle<InterceptorInfo> interceptor_info(holder->GetNamedInterceptor());
-
-  if (name->IsSymbol() && !interceptor_info->can_intercept_symbols())
-    return isolate->heap()->no_interceptor_result_sentinel();
-
-  Address getter_address = v8::ToCData<Address>(interceptor_info->getter());
-  v8::GenericNamedPropertyGetterCallback getter =
-      FUNCTION_CAST<v8::GenericNamedPropertyGetterCallback>(getter_address);
-  DCHECK(getter != NULL);
-
-  PropertyCallbackArguments callback_args(isolate, interceptor_info->data(),
-                                          *receiver, *holder);
-  {
-    // Use the interceptor getter.
-    v8::Handle<v8::Value> r =
-        callback_args.Call(getter, v8::Utils::ToLocal(name));
-    RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-    if (!r.IsEmpty()) {
-      Handle<Object> result = v8::Utils::OpenHandle(*r);
-      result->VerifyApiCallResultType();
-      return *v8::Utils::OpenHandle(*r);
-    }
-  }
-
+  auto res = JSObject::GetPropertyWithInterceptor(holder, receiver, name);
+  RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
+  Handle<Object> result;
+  if (res.ToHandle(&result)) return *result;
   return isolate->heap()->no_interceptor_result_sentinel();
 }
 
 
 static Object* ThrowReferenceError(Isolate* isolate, Name* name) {
   // If the load is non-contextual, just return the undefined result.
   // Note that both keyed and non-keyed loads may end up here.
   HandleScope scope(isolate);
   LoadIC ic(IC::NO_EXTRA_FRAME, isolate, true);
   if (ic.contextual_mode() != CONTEXTUAL) {
@@ skipping 117 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal