libcxxabi/src/cxa_guard.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 "__cxxabi_config.h"
  10 #include "cxxabi.h"
  11
  12 // Tell the implementation that we're building the actual implementation
  13 // (and not testing it)
  14 #define BUILDING_CXA_GUARD
  15 #include "cxa_guard_impl.h"
  16
  17 /*
  18     This implementation must be careful to not call code external to this file
  19     which will turn around and try to call __cxa_guard_acquire reentrantly.
  20     For this reason, the headers of this file are as restricted as possible.
  21     Previous implementations of this code for __APPLE__ have used
  22     std::__libcpp_mutex_lock and the abort_message utility without problem. This
  23     implementation also uses std::__libcpp_condvar_wait which has tested
  24     to not be a problem.
  25 */
  26
  27 namespace __cxxabiv1 {
  28
  29 #if defined(_LIBCXXABI_GUARD_ABI_ARM)
  30 using guard_type = uint32_t;
  31 #else
  32 using guard_type = uint64_t;
  33 #endif
  34
  35 extern "C"
  36 {
  37 _LIBCXXABI_FUNC_VIS int __cxa_guard_acquire(guard_type* raw_guard_object) {
  38   SelectedImplementation imp(raw_guard_object);
  39   return static_cast<int>(imp.cxa_guard_acquire());
  40 }
  41
  42 _LIBCXXABI_FUNC_VIS void __cxa_guard_release(guard_type *raw_guard_object) {
  43   SelectedImplementation imp(raw_guard_object);
  44   imp.cxa_guard_release();
  45 }
  46
  47 _LIBCXXABI_FUNC_VIS void __cxa_guard_abort(guard_type *raw_guard_object) {
  48   SelectedImplementation imp(raw_guard_object);
  49   imp.cxa_guard_abort();
  50 }
  51 } // extern "C"
  52
  53 }  // __cxxabiv1