1 //===---------------------------- cxa_guard.cpp ---------------------------===//
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 {
__cxa_guard_acquire(guard_type * raw_guard_object)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 
__cxa_guard_release(guard_type * raw_guard_object)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 
__cxa_guard_abort(guard_type * raw_guard_object)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
54