src/objects/js-weak-refs.tq

// 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.

extern class JSFinalizationGroup extends JSObject {
  native_context: NativeContext;
  cleanup: Object;
  active_cells: Undefined|WeakCell;
  cleared_cells: Undefined|WeakCell;
  key_map: Object;
  next: Undefined|JSFinalizationGroup;
  flags: Smi;
}

@generateCppClass
extern class JSFinalizationGroupCleanupIterator extends JSObject {
  finalization_group: JSFinalizationGroup;
}

@generateCppClass
extern class WeakCell extends HeapObject {
  finalization_group: Undefined|JSFinalizationGroup;
  target: Undefined|JSReceiver;
  unregister_token: Object;
  holdings: Object;

  // For storing doubly linked lists of WeakCells in JSFinalizationGroup's
  // "active_cells" and "cleared_cells" lists.
  prev: Undefined|WeakCell;
  next: Undefined|WeakCell;

  // For storing doubly linked lists of WeakCells per key in
  // JSFinalizationGroup's key-based hashmap. The key is the identity hash of
  // unregister_token. WeakCell also needs to know its token, so that we can
  // remove its corresponding key from the key_map when we remove the last
  // WeakCell associated with it or when the unregister_token dies. The
  // unregister token is stored above, after target, as both are weak.
  key_list_prev: Undefined|WeakCell;
  key_list_next: Undefined|WeakCell;
}

@generateCppClass
extern class JSWeakRef extends JSObject {
  target: Undefined|JSReceiver;
}