2 //===----------------------------------------------------------------------===//
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP___VERBOSE_ABORT
11 #define _LIBCPP___VERBOSE_ABORT
13 #include <__cxx03/__config>
15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16 # pragma GCC system_header
19 _LIBCPP_BEGIN_NAMESPACE_STD
21 // This function should never be called directly from the code -- it should only be called through
22 // the _LIBCPP_VERBOSE_ABORT macro.
23 _LIBCPP_NORETURN _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS
24 _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2) void __libcpp_verbose_abort(const char* __format, ...);
26 // _LIBCPP_VERBOSE_ABORT(format, args...)
28 // This macro is used to abort the program abnormally while providing additional diagnostic information.
30 // The first argument is a printf-style format string, and the remaining arguments are values to format
31 // into the format-string. This macro can be customized by users to provide fine-grained control over
32 // how verbose termination is triggered.
34 // If the user does not supply their own version of the _LIBCPP_VERBOSE_ABORT macro, we pick the default
35 // behavior based on whether we know the built library we're running against provides support for the
36 // verbose termination handler or not. If it does, we call it. If it doesn't, we call __builtin_abort to
37 // make sure that the program terminates but without taking any complex dependencies in this header.
38 #if !defined(_LIBCPP_VERBOSE_ABORT)
40 # if !_LIBCPP_AVAILABILITY_HAS_VERBOSE_ABORT
41 // The decltype is there to suppress -Wunused warnings in this configuration.
42 void __use(const char*, ...);
43 # define _LIBCPP_VERBOSE_ABORT(...) (decltype(::std::__use(__VA_ARGS__))(), __builtin_abort())
45 # define _LIBCPP_VERBOSE_ABORT(...) ::std::__libcpp_verbose_abort(__VA_ARGS__)
48 #endif // !defined(_LIBCPP_VERBOSE_ABORT)
50 _LIBCPP_END_NAMESPACE_STD
52 #endif // _LIBCPP___VERBOSE_ABORT