[proxies] Make Object.{isFrozen,isSealed} behave correctly for proxies.

src/runtime/runtime-object.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 325 matching lines @@
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
 
   MAYBE_RETURN(
       JSReceiver::SetIntegrityLevel(object, FROZEN, Object::THROW_ON_ERROR),
       isolate->heap()->exception());
   return *object;
 }
 
 
+RUNTIME_FUNCTION(Runtime_ObjectIsFrozen) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
+
+  Maybe<bool> result = JSReceiver::TestIntegrityLevel(object, FROZEN);
+  MAYBE_RETURN(result, isolate->heap()->exception());
+  return isolate->heap()->ToBoolean(result.FromJust());
+}
+
+
 RUNTIME_FUNCTION(Runtime_ObjectSeal) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
 
   MAYBE_RETURN(
       JSReceiver::SetIntegrityLevel(object, SEALED, Object::THROW_ON_ERROR),
       isolate->heap()->exception());
   return *object;
 }
 
 
+RUNTIME_FUNCTION(Runtime_ObjectIsSealed) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
+
+  Maybe<bool> result = JSReceiver::TestIntegrityLevel(object, SEALED);
+  MAYBE_RETURN(result, isolate->heap()->exception());
+  return isolate->heap()->ToBoolean(result.FromJust());
+}
+
+
 RUNTIME_FUNCTION(Runtime_LoadGlobalViaContext) {
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_SMI_ARG_CHECKED(slot, 0);
 
   // Go up context chain to the script context.
   Handle<Context> script_context(isolate->context()->script_context(), isolate);
   DCHECK(script_context->IsScriptContext());
   DCHECK(script_context->get(slot)->IsPropertyCell());
 
@@ skipping 1044 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_ObjectDefineProperties) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, o, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, properties, 1);
   return JSReceiver::DefineProperties(isolate, o, properties);
 }
 }  // namespace internal
 }  // namespace v8