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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//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-exception7//8//===----------------------------------------------------------------------===//9 10#include <__verbose_abort>11#include <exception>12#include "include/atomic_support.h"13 14namespace std {15 16static constinit std::terminate_handler __terminate_handler = nullptr;17static constinit std::unexpected_handler __unexpected_handler = nullptr;18 19// libcxxrt provides implementations of these functions itself.20unexpected_handler set_unexpected(unexpected_handler func) noexcept {21 return __libcpp_atomic_exchange(&__unexpected_handler, func);22}23 24unexpected_handler get_unexpected() noexcept { return __libcpp_atomic_load(&__unexpected_handler); }25 26[[noreturn]] void unexpected() {27 (*get_unexpected())();28 // unexpected handler should not return29 terminate();30}31 32terminate_handler set_terminate(terminate_handler func) noexcept {33 return __libcpp_atomic_exchange(&__terminate_handler, func);34}35 36terminate_handler get_terminate() noexcept { return __libcpp_atomic_load(&__terminate_handler); }37 38[[noreturn]] void terminate() noexcept {39#if _LIBCPP_HAS_EXCEPTIONS40 try {41#endif // _LIBCPP_HAS_EXCEPTIONS42 (*get_terminate())();43 // handler should not return44 __libcpp_verbose_abort("terminate_handler unexpectedly returned\n");45#if _LIBCPP_HAS_EXCEPTIONS46 } catch (...) {47 // handler should not throw exception48 __libcpp_verbose_abort("terminate_handler unexpectedly threw an exception\n");49 }50#endif // _LIBCPP_HAS_EXCEPTIONS51}52 53bool uncaught_exception() noexcept { return uncaught_exceptions() > 0; }54 55int uncaught_exceptions() noexcept {56#warning uncaught_exception not yet implemented57 __libcpp_verbose_abort("uncaught_exceptions not yet implemented\n");58}59 60exception::~exception() noexcept {}61 62const char* exception::what() const noexcept { return "std::exception"; }63 64bad_exception::~bad_exception() noexcept {}65 66const char* bad_exception::what() const noexcept { return "std::bad_exception"; }67 68bad_alloc::bad_alloc() noexcept {}69 70bad_alloc::~bad_alloc() noexcept {}71 72const char* bad_alloc::what() const noexcept { return "std::bad_alloc"; }73 74bad_array_new_length::bad_array_new_length() noexcept {}75 76bad_array_new_length::~bad_array_new_length() noexcept {}77 78const char* bad_array_new_length::what() const noexcept { return "bad_array_new_length"; }79 80bad_cast::bad_cast() noexcept {}81 82bad_typeid::bad_typeid() noexcept {}83 84bad_cast::~bad_cast() noexcept {}85 86const char* bad_cast::what() const noexcept { return "std::bad_cast"; }87 88bad_typeid::~bad_typeid() noexcept {}89 90const char* bad_typeid::what() const noexcept { return "std::bad_typeid"; }91 92} // namespace std93