call method

@override Object? call(InterpreterVisitor visitor, List<Object?> positionalArguments, [ Map<String, Object?> namedArguments = const {}, List<RuntimeType>? typeArguments, ])

Implementation

@override
Object? call(InterpreterVisitor visitor, List<Object?> positionalArguments,
    [Map<String, Object?> namedArguments = const {},
    List<RuntimeType>? typeArguments]) {
  // Establish `D4.activeVisitor` for the duration of every interpreted
  // function call. This makes the visitor available to any native code
  // path that the user function triggers — most importantly the
  // `InterpretedInstance.==` / `.hashCode` overrides, which dispatch
  // through the active visitor when native Dart collections
  // (`Map<UserCell, …>`, `Set<UserCell>`, …) look up keys. Without this
  // wrap, native container operations downstream of a `targetValue[key]`
  // (visitIndexExpression) read `D4.activeVisitor == null` and silently
  // fall back to identity hashing, breaking content-equality lookups.
  //
  // Hot path: push/pop the active visitor directly rather than via
  // `withActiveVisitor`, whose `T Function()` argument allocates a closure on
  // every interpreted function call. The save/set/restore semantics are
  // identical (nesting included).
  final previousActiveVisitor = D4.pushActiveVisitor(visitor);
  try {
    return _callImpl(visitor, positionalArguments, namedArguments,
        typeArguments);
  } finally {
    D4.popActiveVisitor(previousActiveVisitor);
  }
}