[proxies] Make Object.{freeze,seal} 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 316 matching lines @@
     JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties,
                                   "OptimizeForAdding");
   }
   return *object;
 }
 
 
 RUNTIME_FUNCTION(Runtime_ObjectFreeze) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
 
-  // %ObjectFreeze is a fast path and these cases are handled elsewhere.
-  RUNTIME_ASSERT(!object->HasSloppyArgumentsElements() &&
-                 !object->map()->is_observed() && !object->IsJSProxy());
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, JSObject::Freeze(object));
-  return *result;
+  MAYBE_RETURN(
+      JSReceiver::SetIntegrityLevel(object, FROZEN, Object::THROW_ON_ERROR),
+      isolate->heap()->exception());
+  return *object;
 }
 
 
 RUNTIME_FUNCTION(Runtime_ObjectSeal) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
 
-  // %ObjectSeal is a fast path and these cases are handled elsewhere.
-  RUNTIME_ASSERT(!object->HasSloppyArgumentsElements() &&
-                 !object->map()->is_observed() && !object->IsJSProxy());
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, JSObject::Seal(object));
-  return *result;
+  MAYBE_RETURN(
+      JSReceiver::SetIntegrityLevel(object, SEALED, Object::THROW_ON_ERROR),
+      isolate->heap()->exception());
+  return *object;
 }
 
 
 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);
@@ skipping 1227 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