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101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//
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// This file implements the functionality associated with the terminate_handler,
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// unexpected_handler, and new_handler.
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//===----------------------------------------------------------------------===//
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#include "third_party/libcxx/stdexcept"
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#include "third_party/libcxx/new"
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#include "third_party/libcxx/exception"
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#include "third_party/libcxxabi/abort_message.h"
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#include "third_party/libcxxabi/include/cxxabi.h"
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#include "third_party/libcxxabi/cxa_handlers.h"
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#include "third_party/libcxxabi/cxa_exception.h"
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#include "third_party/libcxxabi/private_typeinfo.h"
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#include "third_party/libcxx/atomic_support.h" // from libc++
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namespace std
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{
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unexpected_handler
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get_unexpected() noexcept
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{
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return __libcpp_atomic_load(&__cxa_unexpected_handler, _AO_Acquire);
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}
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void
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__unexpected(unexpected_handler func)
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{
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func();
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// unexpected handler should not return
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abort_message("unexpected_handler unexpectedly returned");
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}
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__attribute__((noreturn))
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void
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unexpected()
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{
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__unexpected(get_unexpected());
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}
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terminate_handler
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get_terminate() noexcept
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{
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return __libcpp_atomic_load(&__cxa_terminate_handler, _AO_Acquire);
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}
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void
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__terminate(terminate_handler func) noexcept
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{
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#ifndef _LIBCXXABI_NO_EXCEPTIONS
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try
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{
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#endif // _LIBCXXABI_NO_EXCEPTIONS
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func();
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// handler should not return
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abort_message("terminate_handler unexpectedly returned");
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#ifndef _LIBCXXABI_NO_EXCEPTIONS
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}
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catch (...)
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{
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// handler should not throw exception
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abort_message("terminate_handler unexpectedly threw an exception");
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}
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#endif // _LIBCXXABI_NO_EXCEPTIONS
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}
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__attribute__((noreturn))
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void
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terminate() noexcept
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{
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#ifndef _LIBCXXABI_NO_EXCEPTIONS
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// If there might be an uncaught exception
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using namespace __cxxabiv1;
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__cxa_eh_globals* globals = __cxa_get_globals_fast();
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if (globals)
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{
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__cxa_exception* exception_header = globals->caughtExceptions;
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if (exception_header)
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{
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_Unwind_Exception* unwind_exception =
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reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
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if (__isOurExceptionClass(unwind_exception))
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__terminate(exception_header->terminateHandler);
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}
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}
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#endif
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__terminate(get_terminate());
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}
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new_handler
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get_new_handler() noexcept
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{
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return __libcpp_atomic_load(&__cxa_new_handler, _AO_Acquire);
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}
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} // std
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