[esnext] handle elements in FastObjectValuesOrEntries()

src/elements.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_ELEMENTS_H_
 #define V8_ELEMENTS_H_
 
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 77 matching lines @@
 
   inline void CollectElementIndices(Handle<JSObject> object,
                                     KeyAccumulator* keys,
                                     uint32_t range = kMaxUInt32,
                                     PropertyFilter filter = ALL_PROPERTIES,
                                     uint32_t offset = 0) {
     CollectElementIndices(object, handle(object->elements()), keys, range,
                           filter, offset);
   }
 
+  virtual Maybe<bool> CollectValuesOrEntries(
+      Isolate* isolate, Handle<JSObject> object,
+      Handle<FixedArray> values_or_entries, bool get_entries, int* nof_items,
+      PropertyFilter filter = ALL_PROPERTIES) = 0;
+
   //
   virtual Handle<FixedArray> PrependElementIndices(
       Handle<JSObject> object, Handle<FixedArrayBase> backing_store,
       Handle<FixedArray> keys, GetKeysConversion convert,
       PropertyFilter filter = ALL_PROPERTIES) = 0;
 
   inline Handle<FixedArray> PrependElementIndices(
       Handle<JSObject> object, Handle<FixedArray> keys,
       GetKeysConversion convert, PropertyFilter filter = ALL_PROPERTIES) {
     return PrependElementIndices(object, handle(object->elements()), keys,
@@ skipping 36 matching lines @@
   virtual Handle<JSArray> Splice(Handle<JSArray> receiver,
                                  uint32_t start, uint32_t delete_count,
                                  Arguments* args, uint32_t add_count) = 0;
 
   virtual Handle<Object> Pop(Handle<JSArray> receiver) = 0;
 
   virtual Handle<Object> Shift(Handle<JSArray> receiver) = 0;
 
   virtual Handle<SeededNumberDictionary> Normalize(Handle<JSObject> object) = 0;
 
+  virtual uint32_t GetCapacity(JSObject* holder,
+                               FixedArrayBase* backing_store) = 0;
+
  protected:
   friend class LookupIterator;
 
   // Element handlers distinguish between entries and indices when they
   // manipulate elements. Entries refer to elements in terms of their location
   // in the underlying storage's backing store representation, and are between 0
   // and GetCapacity. Indices refer to elements in terms of the value that would
   // be specified in JavaScript to access the element. In most implementations,
   // indices are equivalent to entries. In the NumberDictionary
   // ElementsAccessor, entries are mapped to an index using the KeyAt method on
   // the NumberDictionary.
   virtual uint32_t GetEntryForIndex(JSObject* holder,
                                     FixedArrayBase* backing_store,
                                     uint32_t index) = 0;
 
   // NOTE: this method violates the handlified function signature convention:
   // raw pointer parameter |source_holder| in the function that allocates.
   // This is done intentionally to avoid ArrayConcat() builtin performance
   // degradation.
   virtual void CopyElements(JSObject* source_holder, uint32_t source_start,
                             ElementsKind source_kind,
                             Handle<FixedArrayBase> destination,
                             uint32_t destination_start, int copy_size) = 0;
 
  private:
-  virtual uint32_t GetCapacity(JSObject* holder,
-                               FixedArrayBase* backing_store) = 0;
   static ElementsAccessor** elements_accessors_;
   const char* name_;
 
   DISALLOW_COPY_AND_ASSIGN(ElementsAccessor);
 };
 
 void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t index,
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ELEMENTS_H_