xref: /llvm-project-15.0.7/libcxx/include/__assert (revision f87aa19b)

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ASSERT
#define _LIBCPP___ASSERT

#include <__config>
#include <iosfwd> // for std::string

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

#if _LIBCPP_DEBUG_LEVEL >= 1
#   define _LIBCPP_ASSERT_IMPL(x, m) ((x) ? (void)0 : ::std::__libcpp_debug_function(::std::__libcpp_debug_info(__FILE__, __LINE__, #x, m)))
#else
#   define _LIBCPP_ASSERT_IMPL(x, m) ((void)0)
#endif

// We do this dance because some of our tests re-define _LIBCPP_ASSERT to something else.
// In the future, we should find other ways to test our assertions and disallow re-defining
// _LIBCPP_ASSERT.
#if !defined(_LIBCPP_ASSERT)
#   define _LIBCPP_ASSERT(x, m) _LIBCPP_ASSERT_IMPL(x, m)
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

struct _LIBCPP_TEMPLATE_VIS __libcpp_debug_info {
  _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
  __libcpp_debug_info()
      : __file_(nullptr), __line_(-1), __pred_(nullptr), __msg_(nullptr) {}
  _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
  __libcpp_debug_info(const char* __f, int __l, const char* __p, const char* __m)
    : __file_(__f), __line_(__l), __pred_(__p), __msg_(__m) {}

  _LIBCPP_FUNC_VIS string what() const;

  const char* __file_;
  int __line_;
  const char* __pred_;
  const char* __msg_;
};

/// __libcpp_debug_function_type - The type of the assertion failure handler.
typedef void(*__libcpp_debug_function_type)(__libcpp_debug_info const&);

/// __libcpp_debug_function - The handler function called when a _LIBCPP_ASSERT
///    fails.
extern _LIBCPP_EXPORTED_FROM_ABI __libcpp_debug_function_type __libcpp_debug_function;

/// __libcpp_abort_debug_function - A debug handler that aborts when called.
_LIBCPP_NORETURN _LIBCPP_FUNC_VIS
void __libcpp_abort_debug_function(__libcpp_debug_info const&);

/// __libcpp_set_debug_function - Set the debug handler to the specified
///    function.
_LIBCPP_FUNC_VIS
bool __libcpp_set_debug_function(__libcpp_debug_function_type __func);

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ASSERT