libcxx/src/legacy_pointer_safety.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <__config>
  10 #include <memory>
  11
  12 // Support for garbage collection was removed in C++23 by https://wg21.link/P2186R2. Libc++ implements
  13 // that removal as an extension in all Standard versions. However, we still define the functions that
  14 // were once part of the library's ABI for backwards compatibility.
  15
  16 _LIBCPP_BEGIN_NAMESPACE_STD
  17
  18 _LIBCPP_FUNC_VIS void declare_reachable(void*) {}
  19 _LIBCPP_FUNC_VIS void declare_no_pointers(char*, size_t) {}
  20 _LIBCPP_FUNC_VIS void undeclare_no_pointers(char*, size_t) {}
  21 _LIBCPP_FUNC_VIS void* __undeclare_reachable(void* p) { return p; }
  22
  23 _LIBCPP_END_NAMESPACE_STD