Use output parameter to distinguish error from absent result

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1923 matching lines @@
                                             Handle<Name> name,
                                             Handle<Object> getter,
                                             Handle<Object> setter,
                                             PropertyAttributes attributes);
 
   // Defines an AccessorInfo property on the given object.
   MUST_USE_RESULT static MaybeHandle<Object> SetAccessor(
       Handle<JSObject> object,
       Handle<AccessorInfo> info);
 
+  // The result must be checked first for exceptions. If there's no exception,
+  // the output parameter |done| indicates whether the interceptor has a result
+  // or not.
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithInterceptor(
-      LookupIterator* it);
+      LookupIterator* it, bool* done);
 
   // Accessors for hidden properties object.
   //
   // Hidden properties are not own properties of the object itself.
   // Instead they are stored in an auxiliary structure kept as an own
   // property with a special name Heap::hidden_string(). But if the
   // receiver is a JSGlobalProxy then the auxiliary object is a property
   // of its prototype, and if it's a detached proxy, then you can't have
   // hidden properties.
 
@@ skipping 8903 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_