// Copyright 2019 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.

@cppObjectLayoutDefinition
extern class EnumCache extends Struct {
  keys: FixedArray;
  indices: FixedArray;
}

@export
struct DescriptorEntry {
  key: Name|Undefined;
  details: Smi|Undefined;
  value: JSAny|Weak<Map>|AccessorInfo|AccessorPair|ClassPositions|
      NumberDictionary;
}

type FastIterableState extends uint8
    constexpr 'DescriptorArray::FastIterableState';

bitfield struct DescriptorArrayFlags extends uint32 {
  fast_iterable: FastIterableState: 2 bit;
}

@generateBodyDescriptor
@generateUniqueMap
extern class DescriptorArray extends HeapObject {
  const number_of_all_descriptors: uint16;
  number_of_descriptors: uint16;
  // Raw GC state that is maintained during marking.
  // See `DescriptorArrayMarkingState`.
  raw_gc_state: uint32;
  flags: DescriptorArrayFlags;

  @if(TAGGED_SIZE_8_BYTES) optional_padding: uint32;
  @ifnot(TAGGED_SIZE_8_BYTES) optional_padding: void;

  enum_cache: EnumCache;
  descriptors[number_of_all_descriptors]: DescriptorEntry;
}

// A descriptor array where all values are held strongly.
class StrongDescriptorArray extends DescriptorArray {}