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//===------------------------- cxa_handlers.cpp ---------------------------===//
//
// 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
//
//
// This file implements the functionality associated with the terminate_handler,
// unexpected_handler, and new_handler.
//===----------------------------------------------------------------------===//
#include <stdexcept>
#include <new>
#include <exception>
#include "abort_message.h"
#include "cxxabi.h"
#include "cxa_handlers.h"
#include "cxa_exception.h"
#include "private_typeinfo.h"
#include "include/atomic_support.h"
namespace std
{
unexpected_handler
get_unexpected() _NOEXCEPT
{
return __libcpp_atomic_load(&__cxa_unexpected_handler, _AO_Acquire);
}
void
__unexpected(unexpected_handler func)
{
func();
// unexpected handler should not return
abort_message("unexpected_handler unexpectedly returned");
}
__attribute__((noreturn))
void
unexpected()
{
__unexpected(get_unexpected());
}
terminate_handler
get_terminate() _NOEXCEPT
{
return __libcpp_atomic_load(&__cxa_terminate_handler, _AO_Acquire);
}
void
__terminate(terminate_handler func) _NOEXCEPT
{
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
func();
// handler should not return
abort_message("terminate_handler unexpectedly returned");
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
// handler should not throw exception
abort_message("terminate_handler unexpectedly threw an exception");
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
}
__attribute__((noreturn))
void
terminate() _NOEXCEPT
{
#ifndef _LIBCXXABI_NO_EXCEPTIONS
// If there might be an uncaught exception
using namespace __cxxabiv1;
__cxa_eh_globals* globals = __cxa_get_globals_fast();
if (globals)
{
__cxa_exception* exception_header = globals->caughtExceptions;
if (exception_header)
{
_Unwind_Exception* unwind_exception =
reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
if (__isOurExceptionClass(unwind_exception))
__terminate(exception_header->terminateHandler);
}
}
#endif
__terminate(get_terminate());
}
extern "C" {
new_handler __cxa_new_handler = 0;
}
new_handler
set_new_handler(new_handler handler) _NOEXCEPT
{
return __libcpp_atomic_exchange(&__cxa_new_handler, handler, _AO_Acq_Rel);
}
new_handler
get_new_handler() _NOEXCEPT
{
return __libcpp_atomic_load(&__cxa_new_handler, _AO_Acquire);
}
} // std
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